Yearly Archives: 2024

　　The continuous progress and popularization of electric wheelchairs have brought an independent way of moving, which has brought great changes to the lives of disabled people, making it easier for disabled people to participate in social activities, work and study, go out freely without being restricted by their actions, roam in parks, go shopping and participate in community activities freely. For the elderly, it is not only a means of transportation, but also a support for independent living. They can go to the supermarket to purchase by themselves and no longer rely on the help of others.from 電動輪椅 From the reference value, it can also bring a lot of inspiration to other industries. https://www.hohomedical.com/collections/light-weight-wheelchair

　　

　　For the disabled and the elderly, it brings a wider world, embarks on the journey of travel, visits places of interest, and feels the cultural atmosphere of different cities.

　　

　　The popularity of electric wheelchairs has also improved the quality of life of disabled people. Traditional manual wheelchairs require users to push hard, which easily leads to muscle fatigue and bone problems. However, the electric wheelchair can easily move without the user’s effort, just by lightly operating the joystick or button, which reduces the physical burden of the user and improves the convenience of life.

　　

　　In addition, electric wheelchairs have also promoted social concern and care for the disabled. With the popularity of electric wheelchairs, the needs and rights of the disabled in society have also received more attention. Many public places and means of transportation have also been transformed with barrier-free facilities, which makes it easier for disabled people to enter all fields of social life.

　　Cold heading (extrusion) technology is a main processing technology in fastener forming process. Cold heading (extrusion) belongs to the field of metal pressure processing. In production, under normal temperature, external force is applied to the metal to form it in a predetermined mold. This method is usually called cold heading.The industry believes that, Hub bolt The development of our company marks the rapid and steady progress of the whole industry. https://www.chinatianlong.com/

　　

　　In fact, the forming of any fastener can not only be achieved by cold heading, but also accompanied by various deformation methods such as forward and backward extrusion, compound extrusion, punching and rolling in the process of cold heading.

　　

　　Therefore, the name of cold heading in production is just a habitual name, more precisely, it should be called cold heading (extrusion).

　　

　　Cold heading (extrusion) method is a kind of processing method with high comprehensive economic benefit, which is widely used in the fastener industry and is also an advanced processing method widely used at home and abroad.

　　

　　Therefore, how to make full use of and improve the plasticity of metal, master the mechanism of plastic deformation of metal, and develop a scientific and reasonable cold heading (extrusion) processing technology for fasteners is the purpose and purpose of this paper.

　　

　　First, the basic concept of metal deformation

　　

　　Deformation refers to the sum of the relative displacements of the tiny particles that make up the metal when it is stressed (external force and internal force) under the condition of maintaining its integrity.

　　

　　1 Types of deformation

　　

　　A. elastic deformation

　　

　　The ability of a metal to recover its original shape and size when the external force is removed is called elastic deformation.

　　

　　The quality of elasticity is measured by elastic limit and proportional limit.

　　

　　B. Plastic deformation

　　

　　Under the action of external force, a metal is permanently deformed (refers to the deformation that cannot be restored to its original state after removing external force), but the integrity of the metal itself will not be destroyed, which is called plastic deformation.

　　

　　The plasticity is expressed by elongation, area shrinkage and yield limit.

　　

　　2 evaluation method of plasticity

　　

　　The plasticity is expressed by elongation, area shrinkage and yield limit.

　　

　　In order to evaluate the plasticity of metals, a numerical index, called plasticity index, is often used.

　　

　　The plasticity index is expressed by the plastic deformation at the moment when the steel sample begins to fail. In production practice, the following methods are usually used:

　　

　　(1) Tensile test

　　

　　The tensile test is expressed by elongation δ and area shrinkage ψ. It indicates the plastic deformation ability of steel samples under uniaxial tension, which is a common plastic index in metal material standards. The values of δ and ψ are determined by the following formula:

　　

　　Where: L0, lk-the length of the original gauge of the tensile specimen and the gauge after failure.

　　

　　F0, Fk！！ the cross-sectional area of the original and broken parts of the tensile specimen.

　　

　　(2) Upsetting test is also called flattening test.

　　

　　It is to make the sample into a cylindrical shape with the height Ho 1.5 times of the original diameter Do of the sample, and then flatten it on a press until the first visible crack appears on the surface of the sample. At this time, the compression degree εc is the plastic index. Its value can be calculated by pressing the following formula:

　　

　　Where Ho！！ is the original height of the cylindrical sample. Hk！！ the height of the sample when the first visible crack appears on the side surface during flattening.

　　

　　The torsion test is expressed by the torsion angle or the number of torsion turns when the sample is twisted on the twisting machine. Tensile test and upsetting test are commonly used in production.

　　

　　No matter which test method, it is relative to a specific stress state and deformation condition.

　　

　　The plasticity index obtained from this is only a relative comparison, which only shows the plasticity of a certain metal under what deformation conditions.

　　

　　3 Main factors affecting metal plasticity and deformation resistance

　　

　　The concept of metal plasticity and deformation resistance: metal plasticity can be understood as the ability of metal to change its shape stably without destroying the connection between particles under the action of external force. And the force that the metal reacts to the tool and die when it is deformed is called deformation resistance.

　　

　　The main factors affecting metal plasticity and deformation resistance include the following aspects:

　　

　　A. Influence of metal structure and chemical composition on plasticity and deformation resistance

　　

　　The metal structure depends on the chemical composition of the metal, the lattice type of its main elements, and the nature, quantity and distribution of impurities. The fewer constituent elements, the better the plasticity.

　　

　　For example, pure iron has high plasticity.

　　

　　Carbon in iron is a solid melt and has good plasticity, while it is a compound, so its plasticity decreases.

　　

　　For example, the compound Fe3C is actually very brittle. Generally, the increase of other elements in steel will also reduce the plasticity of steel.

　　

　　With the increase of carbon content in steel, the resistance indexes (бb, бp, бs, etc.) of steel all increase, while the plasticity indexes (ε, ψ, etc.) all decrease. When the carbon content in steel is increased by 0.1% during cold deformation, its strength limit бs is increased by about 6 ~ 8 kg/mm2.

　　

　　Sulfur exists in steel as iron sulfide and manganese sulfide. Iron sulfide is brittle, and manganese sulfide is elongated in the process of pressure processing, thus reducing the mechanical index in the transverse direction perpendicular to the fiber. So sulfur is a harmful impurity in steel, and the less the content, the better.

　　

　　Phosphorus in steel improves deformation resistance and reduces plasticity. Steel with phosphorus content higher than 0.1% ~ 0.2% has cold brittleness. Generally, the phosphorus content of steel is controlled at 0.00%. The distribution of other impurities such as low melting point in metal matrix has great influence on plasticity.

　　

　　In a word, the more complex the chemical composition in steel is, the more the content is, and the greater the influence on the resistance and plasticity of steel is. This explains why some high alloy steels are difficult to be cold heading (pressing).

　　

　　B. Effect of deformation speed on plasticity and deformation resistance

　　

　　Deformation velocity is the relative displacement volume per unit time:

　　

　　The deformation speed should not be confused with the movement speed of the deformation tool, but should also be conceptually distinguished from the movement speed of particles in the deformation body.

　　

　　Generally speaking, with the increase of deformation speed, deformation resistance increases and plasticity decreases.

　　

　　In cold deformation, the influence of deformation speed is not as significant as that in hot deformation, which is due to the absence of hardening elimination process.

　　

　　However, when the deformation speed is particularly high, the heat generated by plastic deformation (that is, thermal effect) must not be separated. Increasing the temperature itself will improve plasticity and reduce deformation resistance.

　　

　　C. the influence of stress state on plasticity and deformation resistance

　　

　　Under the action of external force, internal force is generated in the metal, and its strength per unit area is called stress. The stressed metal is under stress.

　　

　　A tiny elementary cube is separated from the deformed body, and the stress with unknown magnitude but known direction acts on the cube. This diagram representing the number and symbol of principal stresses at points is called principal stress diagram.

　　

　　There are nine principal stress diagrams representing the stress state of metals, four of which are three-way principal stress diagrams, three are plane principal stress diagrams and two are unidirectional principal stress diagrams, as shown in Figure 36-1.

　　

　　Principal stress caused by tensile stress is positive sign, and principal stress caused by compressive stress is negative sign.

　　

　　In metal pressure machining, the three-dimensional principal stress diagrams with the same sign and different sign are often encountered. Among the three-dimensional principal stress diagrams with different signs, the principal stress diagram with two compressive stresses and one tensile stress is the most common.

　　

　　In the triaxial stress diagram with the same sign, when the compressive stresses in all directions are equal (б1=б2=б3), and there are no porosity and other defects in the metal, theoretically, plastic deformation cannot occur, only elastic deformation occurs.

　　

　　Unequal triaxial compressive stress diagrams include deformation processes such as volume die forging, upsetting, closed punching, positive and negative extrusion, plate and profile rolling, etc.

　　

　　In the actual production, the triaxial tensile stress diagram is rarely encountered. Only in the tensile test, when necking occurs, the stress line at the necking is the principal stress diagram of triaxial tensile, as shown in Figure 36-2.

　　

　　During upsetting, due to the action of friction, it also presents a three-dimensional compressive stress diagram, as shown in Figure 36-3.

　　

　　In a word, in the stress state of stressed metal, compressive stress is beneficial to the increase of plasticity, while tensile stress will reduce the plasticity of metal.

　　

　　During upsetting, due to the action of friction, it also presents a three-dimensional compressive stress diagram, as shown in Figure 36-3.

　　

　　In a word, in the stress state of stressed metal, compressive stress is beneficial to the increase of plasticity, while tensile stress will reduce the plasticity of metal.

　　

　　D. influence of cold deformation hardening on metal plasticity and deformation resistance

　　

　　The mechanical properties, physical properties and chemical properties of metals are changed after cold plastic deformation.

　　

　　With the increase of deformation degree, all strength indexes (elastic limit, proportional limit, flow limit and strength limit) are improved, and the hardness is also improved. Plastic indexes (elongation, area shrinkage and impact toughness) are decreased; Resistance increases; Corrosion resistance and thermal conductivity are reduced, and the magnetic properties of metals are changed. In plastic deformation, the sum of these properties changes of metals is called cold deformation hardening, or hardening for short.

　　

　　E. the influence of additional stress and residual stress

　　

　　In deformed metal, the stress distribution is uneven, and it is hoped to obtain larger deformation where the stress distribution is more, and smaller deformation where the stress distribution is less.

　　

　　Because of the integrity of the deformed metal itself, there are internal forces that are balanced with each other, that is, the so-called additional stress. When the deformation is terminated, these mutually balanced stresses exist in the deformed body, which constitutes residual stress and affects the plasticity and deformation resistance of the deformed metal in the later deformation process.

　　This paper will start from the earliest development stage of electric wheelchair and trace its development course. The paper quotes the related introduction of motors on the Internet, and introduces its technical progress and the differences of electric wheelchairs with different configurations, including motors, controllers, batteries and frame materials.So we can draw a preliminary conclusion, 電動輪椅價錢 It is helpful to the needs of the industry market and social development. https://www.hohomedical.com/collections/light-weight-wheelchair

　　

　　It also expounds what kind of life the electric wheelchair can improve for the disabled and the elderly, and probes into its positive influence on the life of the disabled, hoping to encourage the disabled and people with mobility difficulties to actively and confidently use reasonable tools to help them improve their quality of life.

　　

　　Since the 1990s, the mechanical design of wheelchair has basically been finalized, and it has made great progress mainly in the scientific and technological content, and has become a completely customizable small vehicle. For example, the famous physicist Hawking’s wheelchair has a built-in computer so that Hawking can control the wheelchair independently.

　　

　　The origin of electric wheelchairs can be traced back to the early 20th century. The earliest electric wheelchair was invented by Canadian engineer George Klein, who designed an electric wheelchair to help soldiers who lost their walking ability because of disability during World War II. Clay’s core design is still the design basis of electric wheelchair because the wheelchair is endowed with more comprehensive functions. Although this kind of electric wheelchair is relatively heavy, it provides a way for the disabled to move independently and greatly improves their quality of life.

　　The chemical formula for nitric acid is HNO3. Anhydrous pure nitric acid is a colorless liquid that easily decomposes into nitrogen dioxide, resulting in a reddish brown color.Mentioned in the article Plating filter Born with strong vitality, you can turn a cocoon into a butterfly and become the best yourself after wind and rain. http://www.luoyuan108.com/

　　

　　Many chemical users need to choose nitric acid pumps. So, how should nitric acid pumps be selected and which pump is better? Firstly, when transporting nitric acid, it is necessary to understand the characteristics, temperature, concentration, density, and equipment conditions of nitric acid, and then choose the corresponding pump type. Usually, nitric acid pumps can use 304 or 316L, but nitric acid reacts with metals. For the sake of service life, it is recommended to use fluoroplastic magnetic pumps. Of course, fluoroplastic centrifugal pumps can also be used. Generally, we recommend choosing magnetic pumps, which are fully enclosed, without shaft seals, and have the advantage of no leakage.

　　

　　It should be noted that nitric acid has swelling properties for most rubber and fluororubber. Therefore, it is recommended to use expanded PTFE or pure PTFE for the auxiliary static seal of the pump (due to the hardness of pure PTFE, the sealing surface of nitric acid pumps often cannot be tightly compressed, so it is recommended to use soft PTFE).

　　Bolt looseness is common, but if you don’t pay attention, it will often cause equipment vibration, component damage, and even casualties. How to tighten a small nut has always been a long-lasting topic in mechanical design. Today, let’s talk about the most basic method of fixing nuts in work.contemporaneity Hub bolt Our competitors have not made large-scale improvements, so we should get ahead of everyone in the project. https://www.chinatianlong.com/

　　

　　In general, we analyze the bolt fracture from the following four aspects:

　　

　　First, the quality of bolts

　　

　　Second, the pre-tightening torque of bolts

　　

　　Third, the strength of bolts

　　

　　Fourthly, the fatigue strength of bolts.

　　

　　In fact, most cases of bolt fracture are caused by looseness, specifically, it is damaged due to looseness. Because the situation of bolt loosening and breaking is basically the same as that of fatigue fracture, finally, we can always find the reason from the fatigue strength. In fact, the fatigue strength is so great that we can’t imagine it, and the fatigue strength is not used at all in the use of bolts.

　　

　　01

　　

　　The bolt fracture is not due to the tensile strength of the bolt.

　　

　　Take a M20〜80 8.8-grade high-strength bolt as an example. Its weight is only 0.2kg, and its minimum tensile load is 20t, which is as high as 100,000 times its own weight. Under normal circumstances, we only use it to fasten 20kg parts, and only use one thousandth of its maximum capacity. Even under the action of other forces in the equipment, it is impossible to exceed 1,000 times the weight of the parts, so the tensile strength of threaded fasteners is sufficient and it is impossible to damage them because of insufficient strength of bolts.

　　

　　02

　　

　　The fracture of bolts is not due to the fatigue strength of bolts.

　　

　　Threaded fasteners can be loosened only 100 times in the transverse vibration loosening experiment, but they need to be vibrated repeatedly for one million times in the fatigue strength experiment. In other words, the threaded fastener is loose when using one ten thousandth of its fatigue strength, and we only use one ten thousandth of its great capacity, so the loosening of the threaded fastener is not due to the fatigue strength of the bolt.

　　

　　03

　　

　　The real reason for the damage of threaded fasteners is looseness.

　　

　　When the threaded fastener is loosened, it generates huge kinetic energy mv2, which directly acts on the fastener and equipment, causing the fastener to be damaged. After the fastener is damaged, the equipment cannot work in a normal state, further causing the equipment to be damaged.

　　

　　When the fastener is subjected to axial force, the thread is damaged and the bolt is pulled off.

　　

　　When the fastener is subjected to radial force, the bolt is cut and the bolt hole is oval.

　　

　　04

　　

　　Choosing thread locking mode with excellent locking effect is the fundamental solution to the problem.

　　

　　Take hydraulic hammer as an example. The weight of GT80 hydraulic hammer is 1.663 tons, and its side bolts are 7 sets of M42 bolts of grade 10.9. The tensile force of each bolt is 110 tons, and the pre-tightening force is half of the tensile force, and the pre-tightening force is as high as 300 to 400 tons. However, the bolt will break, and now it is ready to be changed to M48 bolt. The fundamental reason is that the bolt locking cannot be solved.

　　

　　When a bolt breaks, it is easy for people to conclude that the strength is not enough, so most of them adopt the method of increasing the strength grade of the bolt diameter. This method can increase the pre-tightening force of the bolt, and its friction force is also increased. Of course, the anti-loosening effect can also be improved, but this method is actually a non-professional method, and its investment is too large and its income is too small.

　　

　　In short, the bolt is: “If you don’t loosen it, it will break.”

　　

　　Cause analysis of bolt looseness

　　

　　The threaded connection is designed according to the self-locking condition: ψ ＋ρv, and the friction pair generated in the threaded pair makes the bolt self-lock to tighten the bolt, so the connection will not loosen automatically under static load. However, under impact, vibration, variable load and great temperature change, the friction force f of the screw pair will decrease or disappear instantly. If this phenomenon occurs repeatedly, the connecting bolt will gradually loosen. After the threaded fastener is loosened, the kinetic energy mv2 is generated, and the fastener subjected to axial force, the thread is destroyed and the bolt is pulled off. Fasteners subjected to radial force, bolts are cut and bolt holes are broken.

　　

　　Bolt locking principle: limit the relative motion between screw pairs or increase the difficulty of relative motion.

　　

　　Introduction of common anti-loosening methods

　　

　　There are three commonly used methods for locking bolts: friction locking, mechanical locking and permanent locking. Among them, mechanical locking and friction locking are called detachable locking, while permanent locking is called non-detachable locking.

　　

　　01

　　

　　Friction locking

　　

　　1. Spring gasket locking

　　

　　The anti-loosening principle of the spring washer is that after the spring washer is flattened, the spring washer will generate a continuous elastic force, so that the threaded connection pair between the nut and the bolt will maintain a friction force continuously and generate a resistance moment, thus preventing the nut from loosening. At the same time, the sharp corner at the opening of the spring washer is embedded into the surface of the bolt and the connected piece respectively, thus preventing the bolt from rotating relative to the connected piece.

　　

　　2. Lock the top nut (double nut)

　　

　　3. Self-locking nut locking

　　

　　One end of the nut is made into a non-circular convergent or radially convergent after being slit. When the nut is tightened, the closure expands, and the screwing threads are pressed by the elastic force of the closure.

　　

　　4. Locking of elastic ring nut

　　

　　Fiber or nylon is embedded in the thread to increase friction. The elastic ring also plays a role in preventing liquid leakage.

　　

　　02

　　

　　Mechanical locking

　　

　　Locking of groove nut and cotter pin

　　

　　2. Stop gasket

　　

　　After the nut is tightened, the single-ear or double-ear stop washer is bent and attached to the side of the nut and the connected part respectively to realize locking.

　　

　　3. Locking of series steel wire

　　

　　Use low-carbon steel wire to penetrate the holes in the head of each screw, and connect the screws in series to brake each other.

　　

　　03

　　

　　Permanent locking

　　

　　Commonly used permanent locking are: spot welding, riveting, bonding, etc. This method mostly destroys threaded fasteners during disassembly and cannot be reused.

　　

　　In addition, there are other ways to prevent loosening, such as: coating liquid adhesive between screwing threads, embedding nylon rings at the end of nuts, riveting and locking. Mechanical locking and friction locking are called detachable locking, while permanent locking is called non-detachable locking.

　　

　　1, punching method to prevent loose

　　

　　After the nut is tightened, the thread is damaged at the end of the thread.

　　

　　2. Adhesive Locking-Nut Locking Solution

　　

　　Apply the nut locking liquid to the bolt tightening position, and then screw on the nut. After self-curing, the locking effect is good.

　　The development trend of electric wheelchair and old scooter is portable, and the lighter the electric wheelchair, the more convenient it is. However, there will be some wrong operations when the elderly choose or use them, which will often cause unnecessary problems and avoid unnecessary injuries caused by improper operation.With the upsurge of industry development, 電動輪椅價錢 The expressive force in the market has also been very good, bringing many brand-new high-quality experiences to users. https://www.hohomedical.com/collections/light-weight-wheelchair

　　

　　First, the driving operation is not standardized: the elderly and disabled people sometimes appear in the fast lane and ignore the traffic lights when driving electric wheelchairs and old scooters. This is a very dangerous operation, because the speed of electric wheelchairs and old scooters is very slow, and the speed is generally not more than 10 kilometers per hour. Driving an electric wheelchair scooter on the fast lane will cause traffic congestion, and in the worst case, it will cause a serious traffic accident. You must not drive on the motor vehicle lane, and you should drive on the sidewalk or non-motor vehicle lane.

　　

　　Second, electric wheelchairs and old scooters need daily maintenance, especially before use, the power and tires must be checked, and the welding points of the frame and the tightness of each screw need to be checked every once in a while. Electric scooter had better keep the battery fully charged at any time, and charge it as needed. Frequent power loss will lead to the reduction of power storage capacity. There are still many people who blindly pursue cruising range and driving speed when purchasing electric wheelchairs and old scooters. In reality, it should be chosen according to the user’s normal range of activities. If the range of activities is small, it is not necessary to choose an old scooter with too large battery capacity.

　　

　　Third, in the process of selling electric wheelchairs and elderly scooters, many elderly people often choose portable folding electric wheelchairs for convenience. In fact, this is a serious misconception. We always guide the elderly not to move electric wheelchairs, scooters and so on. Even if it is difficult to pass, it is recommended to get off and pass. If you encounter steps on the road, it is best to ask your family or passers-by for help. It is not recommended for the elderly to move it by themselves, because the lightest folding electric wheelchair weighs about twenty or thirty kilograms. This weight is also very heavy for the elderly, and if you move it by your own strength, it may lead to unnecessary injuries such as waist fractures.

　　The treatment of corrosive liquids has always been a common challenge in many industrial fields. To solve this problem, it is particularly important to choose a pump suitable for transporting corrosive media. The KB series self-priming acid alkali pump is a high-performance pump that combines multiple advantages and is suitable for various complex working environments such as acid and alkali. The following are the characteristics, performance, applications, and selection references of KB series self-priming acid alkali pumps. We hope that through this article, everyone can have a deeper understanding of KB series self-priming pumps.In addition to domestic, chemical pump It has also emerged in the international field and gradually gained the favor of more foreign friends. http://www.luoyuan108.com/

　　

　　Product Features

　　

　　1. Unique shaft seal design – The interior adopts Teflon Bellow Seal self cooling design, effectively protecting the pump shaft and improving cooling effect. This design ensures stable operation of the pump under harsh conditions and improves its service life.

　　

　　2. Self suction design – The self suction force is particularly strong, reaching up to 20ft, effectively avoiding liquid backflow inside the pump. At the same time, the equipped check valve design further prevents liquid backflow, ensuring the stable operation of the pump.

　　

　　3. Strong acid resistance, strong alkali resistance, and strong corrosion resistance – made of materials such as CFRPP and PVDF, it can resist the erosion of various corrosive media such as strong acids and bases, ensuring the long-term service life of the pump.

　　

　　4. The integrated design of the rear cover, shaft seal shield, and foot seat makes maintenance and assembly more convenient, while also enhancing the overall aesthetics of the pump.

　　

　　5. The inlet needs to be equipped with a bottom valve – the bottom valve can effectively block the suction of foreign objects and protect the safe operation of the pump.

　　

　　6. The outlet needs to be equipped with a check valve – a check valve can prevent instantaneous backflow during shutdown, avoiding damage to the pump body and pump idling.

　　

　　Specification parameters

　　

　　Flow range: 200-900 (L/min)

　　

　　Head range: 6-32 (m)

　　

　　Materials used: FRPP, PVDF

　　

　　Motor power: 0.75-7.5 (kw)

　　

　　Temperature range: 0-75 ≧ (PP, FRPP) 0-90 ≧ (PVDF)

　　

　　Usage and maintenance

　　

　　1. Before using the pump, please ensure that the bottom valve is installed correctly to prevent foreign objects from being sucked into the pump.

　　

　　2. Before starting the pump, please check if the inlet and outlet valves are open to ensure the normal operation of the pump.

　　

　　3. It is recommended to regularly inspect and maintain the pump to ensure its normal operation and extend its service life.

　　

　　4. Regularly replace bearings and seals to avoid wear and leakage.

　　

　　5. If any abnormal situation is found during the operation of the pump, it should be stopped immediately for inspection.

　　

　　Application Fields

　　

　　The KB series self-priming acid and alkali resistant pumps are widely used in chemical, pharmaceutical, food, environmental protection and other fields. In these fields, KB pumps can be used to transport various corrosive media such as acids, bases, salts, etc. For example, in the chemical industry, KB pumps can be used to transport corrosive acid liquids such as sulfuric acid and hydrochloric acid; In the pharmaceutical industry, KB pumps can be used to transport various drug solutions; In the food industry, KB pumps can be used to transport various acid-base solutions and corrosive food additives.

　　

　　Other fields: In addition to the above fields, KB pumps can also be applied in environmental protection, oil, natural gas and other fields. For example, in the field of environmental protection, KB pumps can be used to treat pollutants such as industrial wastewater and acidic gases. In the field of oil and gas, KB pumps can be used to transport various corrosive media, such as acidic gases, alkaline solutions, etc.

　　

　　Selection suggestions

　　

　　When choosing a self-priming pump, the following factors need to be considered:

　　

　　1. Medium characteristics: including the corrosiveness, viscosity, density, and other properties of the medium, in order to select suitable materials and structures.

　　

　　2. Process parameters: including flow rate, head, pressure, and other parameters to select the appropriate model and power.

　　

　　3. Environmental conditions: including temperature, humidity, air quality, etc., in order to select the appropriate protection level and motor configuration.

　　

　　4. Application scenarios: including the industry of use, purpose, installation method, etc., in order to select suitable functions and structures.

　　

　　5. Based on the above factors, it is possible to choose the appropriate KB pump model and configuration for the application. In addition, it is recommended to consider factors such as brand and quality assurance when selecting pumps to ensure long-term stable operation and service life.

　　

　　In summary, the KB series self-priming acid alkali pump is a high-performance, corrosion-resistant, and easy to maintain pump. Its unique shaft seal design and self-priming design make it perform well in handling corrosive liquids. Whether in the chemical, pharmaceutical, or other industrial fields, the KB series self-priming acid and alkali resistant pumps are a reliable choice. If you need more information about the KB series self-priming acid alkali pump, please feel free to contact our professional team, and we will be happy to serve you.

　　Mini round Bluetooth speakers are a popular choice for music lovers due to their compact size and portability. But how do they stack up when it comes to sound quality? Despite their small dimensions, mini round bluetooth speakers can deliver surprisingly impressive audio performance. Let¨s explore the factors that affect their sound quality and why they might be the perfect addition to your audio setup.In addition to domestic, high quality portable speakers It has also emerged in the international field and gradually gained the favor of more foreign friends. https://sodlk.com/

　　

　　Compact Size, Big Sound

　　

　　Mini round Bluetooth speakers, like those available on SODLK, are designed to deliver quality sound without taking up too much space. Due to advancements in speaker technology, even small speakers can produce clear audio with relatively full sound ranges. While they may not match the deep bass output of larger speakers, many models are engineered to produce balanced mids and highs, making them ideal for casual listening at home or on the go.

　　

　　aa.jpg

　　

　　Sound Clarity and Volume

　　

　　For their size, mini round Bluetooth speakers can offer surprising clarity. While they may lack the power to fill a large room with sound, their volume levels are sufficient for personal use or small gatherings. Products on SODLK are known for integrating high-quality components that enhance the clarity of vocals and instruments, providing a crisp listening experience without distortion at higher volumes.

　　

　　The Impact of Bluetooth Technology

　　

　　Bluetooth 5.3, which is commonly found in modern mini round Bluetooth speakers, plays a crucial role in maintaining sound quality. With improved transmission speeds and stability, Bluetooth 5.3 ensures minimal lag and lossless sound quality when streaming music wirelessly. This means users can enjoy high-fidelity audio without interruptions or drops in connection.

　　

　　Battery Life and Sound Quality

　　

　　Mini round Bluetooth speakers typically come with rechargeable batteries that last several hours on a full charge. While using the speaker at higher volumes may reduce battery life, it doesn¨t generally affect sound quality until the battery is nearly depleted. Manufacturers like SODLK often prioritize a balance between battery performance and sound output, ensuring a consistent audio experience throughout the device’s usage.

　　

　　Portability Without Compromise

　　

　　One of the major selling points of mini round Bluetooth speakers is their portability. Despite being easy to carry around, their sound quality remains uncompromised. The models available at SODLK are designed to offer a perfect blend of portability and sound quality, making them ideal for outdoor activities like picnics or camping trips.

　　

　　

　　Conclusion

　　

　　In conclusion, mini round Bluetooth speakers offer an impressive audio experience for their size, combining portability with clear, balanced sound. Whether you’re using them at home, in the office, or outdoors, they provide a convenient and enjoyable way to listen to music. If you’re looking for high-quality mini round Bluetooth speakers, SODLK offers a variety of options that deliver great sound in a small package.

　　There are many packaging materials on the market. With the rapid development of modern industry and the rising living standards, people use paper boxes more frequently for the outer packaging of exquisite gifts, which increases the demand for higher quality in paper boxes.With the expanding influence of the industry, jewelry box Our business is also constantly spreading, and the development of the market is also gradually advancing. https://ophexin.com/

　　

　　carton packaging

　　

　　Luxury rigid round box

　　

　　Manufacturers create paper box packaging from exquisite materials and designs, giving the packaging itself significant ornamental value.

　　

　　carton packaging

　　

　　Cartons can be easily customized with designs and branding, enhancing product presentation and marketing.

　　

　　At the same time, companies widely use carton packaging. To judge whether a paper box is qualified, the surface must be clean and flat, without wrinkles, damage, stains or impurities. The fonts and patterns should be clear and correct, without misprints, omissions, or ink pollution. Moreover, the size should meet the specifications, and the deviation should be within the allowable range. The color box that needs to be filled with corrugated paper should pass the test. The bonding of the color box should be tight and firm, without looseness or cracking.

　　

　　carton packaging

　　

　　Many cartons are made from recyclable materials, aligning with sustainable practices and reducing environmental impact.

　　

　　The reason why carton packaging stands out among various gift box packaging materials is that the environmental protection concept of paper box packaging is also a major focus. In an environment that advocates sustainable development and environmentally friendly production, environmental protection has become an element in the development of paper box packaging.

　　

　　On the other hand, the box-shaped and beautifully printed paper boxes have a stronger visual impact when packaging goods. Paper box packaging has become deeply integrated with goods and increasingly plays a crucial role in the successful sales of products.

　　Rechargeable batteries have gradually become a necessity in people’s daily life. My friends, do you know how much safety hazard will be brought about by the irregular operation of electric wheelchair batteries? When the battery is charged for a long time, physical and chemical reactions are easy to occur inside the battery, resulting in a large amount of heat and gas. When the battery is overloaded and charged, it is easy to explode, igniting the plastic parts of the electric vehicle and releasing a large amount of toxic smoke, resulting in casualties and property losses.Besides, we can’t ignore. 電動輪椅 It has injected new vitality into the development of the industry and has far-reaching significance for activating the market. https://www.hohomedical.com/collections/light-weight-wheelchair

　　

　　Pay attention to the following items when charging the battery:

　　

　　1. When charging the electric wheelchair, use the charger adapted to the electric wheelchair, and check whether the rated input voltage of charging is consistent with the power supply voltage. It is forbidden to cover or place the charger on the seat cushion. Unplug the plug on the AC power supply after charging, and then unplug the plug connected to the battery. It is forbidden to connect the charger to the AC power supply for a long time without charging.

　　

　　2. The charging time of the electric wheelchair is suggested to be 6-8 hours. When the charging indicator light changes from red to green, it means that the battery is fully charged. Do not charge the electric wheelchair for a long time, especially in summer, when it is hot and charging for a long time, it is difficult for the charger to dissipate heat and cause combustion. Keep an eye on it when charging.

　　

　　3. When charging the electric wheelchair, check whether the connector is loose, whether the line equipment is aging, and the rubber of the wire is damaged, which may easily lead to short circuit and fire.

　　

　　4. Qualified electric wheelchairs, chargers and batteries produced by manufacturers with production licenses shall be used, and electric wheelchairs and accessories shall not be modified in violation of regulations. It is strictly forbidden to change or modify the charging circuit without permission. If the product or personnel accident occurs as a result, the manufacturer is not responsible.

　　

　　5. Electric wheelchairs should be parked in designated areas, not in stairwells, evacuation passages, and not occupying fire truck passages.

　　

　　6. Do not buy and use some non-standard and over-standard electric wheelchairs, and do not use non-original chargers to charge electric wheelchairs.

　　

　　7. Do not charge the electric wheelchair by private wiring, and do not charge it indoors, in the basement, at the entrance of the building, etc. Avoid charging immediately after driving at high temperature.

　　

　　8. Electric wheelchairs that are not used for a long time should be charged first, and placed after being fully charged, and then the main switch of the circuit should be disconnected.

　　

　　9. Keep a good ventilation environment at the charging place. Do not charge in the sun or wet environment. Be sure to stay away from flammable and explosive materials during charging and storage. Do not expose the charger to outdoor heat sources, such as radiator, fire source and sunlight.

　　

　　10. Do not move the wheelchair while the electric wheelchair is charging.

　　

　　11. Never modify the electric wheelchair, and check and maintain it regularly to prevent problems before they happen.