CN216718105U

CN216718105U - Friction wear test device

Info

Publication number: CN216718105U
Application number: CN202220037008.5U
Authority: CN
Inventors: 许方南; 刘鹏飞; 吴锦武
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-01-07
Filing date: 2022-01-07
Publication date: 2022-06-10
Anticipated expiration: 2032-01-07

Abstract

The embodiment of the application provides a friction wear test device, which comprises a quantitative cylinder, a piston mechanism, a driving mechanism and a boosting mechanism; the quantitative cylinder is provided with an inner cavity and is used for containing glue; the piston mechanism comprises a piston and a piston rod, the piston is positioned in the inner cavity and matched with the wall of the inner cavity to divide the inner cavity into a first cavity and a second cavity, the glue is positioned in the first cavity, and the piston rod extends out of the second cavity and is connected with the driving mechanism outside the quantitative cylinder; the driving mechanism is used for driving the piston to move through the piston rod so as to adjust the capacity of the first chamber; the pressure increasing mechanism is communicated with the first chamber and is used for increasing the air pressure of the first chamber. The testing device can truly reduce the working condition of each part in the dispenser, the period of a gap between the piston and the quantitative cylinder due to abrasion is tested through continuous tests, the dispenser is maintained in time, glue leakage in a glue storage chamber in the dispenser is prevented, the step of regular maintenance of the dispenser is omitted, and the working efficiency of the dispenser is improved.

Description

Friction wear test device

Technical Field

The application relates to the field of battery manufacturing equipment, in particular to a frictional wear test device.

Background

In the production process of the power battery, the assembly of the housing and the electrode assembly of the battery cell is generally bonded by glue, and a dispenser is generally used when the housing or the electrode assembly is coated with glue.

The glue dispenser is also called a glue spreader, a glue dispenser and the like, and the working principle is as follows: glue in the feeding system is squeezed into a glue storage chamber formed by a glue cylinder and a glue dispensing piston through high pressure, after the glue is applied to the feeding system, the air pressure in the glue storage chamber reaches certain high air pressure, the glue storage chamber is connected with a glue dispensing nozzle through a feeding pipe, a valve is arranged at the joint of the glue dispensing nozzle and the feeding pipe, the air pressure in the glue storage chamber is increased by pushing the glue dispensing piston to move until the glue storage chamber reaches certain pressure and the valve is pushed to be opened, and glue flows out of the glue dispensing nozzle after flowing through the feeding pipe from the glue storage chamber, so that the glue dispensing operation can be performed.

However, along with the increase of the service life of the dispenser, the inner wall of the glue cylinder of the dispenser not only receives the friction force of the glue dispensing piston, but also receives the friction force of glue, and the large abrasion loss of the inner wall of the glue cylinder can lead to a gap between the glue dispensing piston and the inner wall of the glue cylinder, and the glue can leak through the gap, thus leading to the loss of the glue applied to the product, and further leading to the occurrence of the condition that the shell of the battery cell is not firmly adhered to the electrode assembly, therefore, before the gap is generated between the glue dispensing piston and the inner wall of the glue cylinder, the maintenance or the replacement of the glue cylinder and the glue dispensing piston in time is very important.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the embodiment of the present application provides a frictional wear test device, which can measure the time of the gap between the glue cylinder and the glue dispensing piston in the glue dispenser, so that the personnel can maintain or replace the glue cylinder and the glue dispensing piston of the glue dispenser in time, the step of regular maintenance of the glue dispenser is omitted, the manpower is saved, and the working efficiency of the glue dispenser is improved.

According to an aspect of an embodiment of the present application, there is provided a frictional wear test device including: the device comprises a quantitative cylinder, a piston mechanism, a driving mechanism and a boosting mechanism; the quantitative cylinder is provided with an inner cavity and is used for containing glue; the piston mechanism comprises a piston and a piston rod, the piston is positioned in the inner cavity and divides the inner cavity into a first cavity and a second cavity, the glue is positioned in the first cavity, and the piston rod extends out of the second cavity and is connected with the driving mechanism; the driving mechanism drives the piston to move through the piston rod; the pressure increasing mechanism is communicated with the first chamber and is used for increasing the air pressure of the first chamber.

By adopting the scheme, the quantitative cylinder simulates a rubber cylinder of the dispenser, the first cavity simulates a rubber storage chamber of the dispenser, the piston simulates a dispensing piston in the rubber cylinder of the dispenser, and in the test process, the pressure in the first cavity is increased to a certain high pressure by the boosting mechanism for simulating a high-pressure environment in the rubber storage chamber after the feeding in the dispenser is completed; the driving mechanism drives the piston to linearly and reciprocally slide in the quantitative cylinder through the piston rod, when the piston moves towards the direction of the first cavity, the capacity of the first cavity of the quantitative cylinder is reduced, the air pressure in the first cavity is increased along with the air pressure, the glue is pushed by the piston to move in the direction away from the second cavity in the first cavity and gradually gathers between the end wall of the first cavity and the piston, the glue rubs the peripheral wall of the first cavity in the moving process, the process is used for simulating the glue dispensing process of the glue dispenser, namely, the glue dispensing piston slides towards the glue storage chamber in the glue cylinder, the glue dispensing piston applies pressure to the glue, and the glue moves along the inner wall of the glue cylinder; when the piston moves towards the direction of the second chamber, the capacity of the first chamber of the quantitative cylinder is increased, the air pressure in the first chamber is reduced, and the process is used for simulating the glue dispensing machine to return the glue dispensing piston to the initial position in the glue cylinder after glue dispensing; when the piston moves towards the second chamber, the air pressures at different positions in the first chamber are different, namely the air pressure of the first chamber on one side close to the piston is rapidly reduced, the air pressure of the first chamber on one side far away from the piston is relatively high, glue tends to move towards the second chamber along with the piston in the first chamber, and the gathered glue is dispersed in the whole first chamber. The state of the glue being dispersed throughout the first chamber is used to simulate the state of the glue reservoir for restocking a measured quantity of glue. In conclusion, in the test process of the friction wear device, when the piston moves towards the first cavity, the motion process of glue in the first cavity is similar to the motion process of the glue in the glue storage chamber of the glue dispenser, the test device can truly reduce the working conditions of a glue cylinder, a glue dispensing piston and the like in the glue dispenser, the period of a gap between the piston and a quantitative cylinder due to wear is tested through continuous tests, when the accumulated use duration of the glue dispenser is about to reach the wear period, parts of the glue dispenser corresponding to the test device are maintained or replaced, so that glue leakage in the glue storage chamber is prevented, the step of regular maintenance of the glue dispenser is omitted, manpower is saved, and the working efficiency of the glue dispenser is improved.

In some embodiments, the driving mechanism comprises a linear motor, and a mover of the linear motor is connected with the piston rod to drive the piston rod and the piston to move along the straight line.

By adopting the above scheme, in the use process of the dispensing machine, according to the requirement of a product, the glue discharging speed of the dispensing machine has different requirements, the moving speed of the dispensing piston in the glue cylinder is in direct proportion to the glue discharging speed of the dispensing machine, therefore, the moving speed of the dispensing piston can be adjusted according to the glue discharging speed, for better simulating the moving speed of the dispensing piston, the speed of the driving mechanism for pushing the piston to move needs to be adjusted, the linear motor has a wide speed range, the linear motion speed can be adjusted according to the motion state of the dispensing piston to be simulated, and the linear motor is directly connected with the piston rod, no transmission gap exists, therefore, the rigidity is high, and the speed transmission accuracy is high. In addition, the permanent magnet of linear electric motor is modular design usually, and the figure of module can be according to required length increase and decrease to it is adjustable and controllable to realize the stroke for the stroke length of adjustment piston once motion, so that it adapts to the motion stroke of the point gluing piston in the point gluing machine, thereby makes the wear cycle of each part in the testing device that the test obtained and the wear cycle of corresponding part in the actual point gluing machine more be close.

In some embodiments, the drive mechanism comprises a pneumatic cylinder, the output of which is connected to the piston rod to drive the piston rod and piston in a linear motion.

By adopting the scheme, the driving mechanism is simple in structure and reliable in work, a speed reduction device can be omitted, no transmission gap exists, and the motion is stable.

In some embodiments, the driving mechanism includes a screw, a nut, and a bidirectional rotating motor, an output shaft of the bidirectional rotating motor is coaxially connected with the screw to drive the screw to rotate, the nut is engaged with the screw to move linearly when the screw rotates, and the nut is connected with the piston rod to drive the piston rod and the piston to move linearly.

By adopting the scheme, the bidirectional rotating motor drives the screw rod to rotate, the screw rod is meshed with the nut to drive the nut to move, and the nut can convert the rotation of the screw rod into self linear motion so as to drive the piston rod to do linear motion; the bidirectional rotating motor can drive the screw rod to rotate bidirectionally, and then the nut can drive the piston rod and the piston to do linear reciprocating motion; the driving mechanism has high axial rigidity and high transmission efficiency.

In some embodiments, the pressure boosting mechanism comprises a gas injection pipe and a gas injector, one end of the gas injection pipe is communicated with the first chamber, and the other end of the gas injection pipe is communicated with the output end of the gas injector, and is used for introducing the gas output by the gas injector into the first chamber.

By adopting the scheme, the gas injection member outputs compressed gas, the compressed gas enters the first cavity through the gas injection pipeline, and the compressed gas forms certain high air pressure in the first cavity, so that when the linear reciprocating mechanism does not drive the piston to move, the glue in the first cavity is always in a certain high air pressure environment; the high-pressure environment simulates the environment of a glue storage chamber after the feeding is finished in the dispenser. The gas injection piece passes through gas injection pipeline and first cavity intercommunication, and the gas injection pipeline can be crooked to arbitrary direction for the position of gas injection piece sets up more in a flexible way, and the requirement of test device to the space reduces.

In some embodiments, the gas injector comprises a gas pump, and a gas outlet end of the gas pump is communicated with the gas injection pipeline to inject gas into the first chamber.

Through adopting above-mentioned scheme, the air pump can compressed gas produce atmospheric pressure, and the compressed gas that the air pump produced gets into first cavity through the gas injection pipeline, and then increases first cavity internal gas pressure.

In some embodiments, the gas injector includes a cylinder having a rodless cavity connected to a gas injection line to pass gas from the rodless cavity into the first chamber.

Through adopting above-mentioned scheme, through the capacity size that reduces the rodless chamber of cylinder for the rodless chamber output compressed gas of cylinder, compressed gas gets into first cavity through the gas injection pipeline, and then increases first cavity internal gas pressure.

In some embodiments, a check valve is disposed on the gas injection pipe for restricting gas in the first chamber from flowing out through the gas injection pipe.

Through adopting above-mentioned scheme, check valve is used for guaranteeing that the gas of first cavity can not flow through the gas injection pipeline, makes first cavity keep high pressure environment in order to simulate the environment of glue storage chamber more accurately to prevent that the glue in the first cavity from flowing along the gas injection pipeline.

In some embodiments, the friction wear test apparatus further comprises a gas pressure monitoring device for monitoring the gas pressure within the first chamber.

Through adopting above-mentioned scheme, when appearing the clearance between piston and the ration jar inner wall, because be the high atmospheric pressure in the first cavity, there is the atmospheric pressure difference between first cavity and the second cavity, gas in the first cavity can leak to the second cavity, so atmospheric pressure in the first cavity can reduce and surpass the change range of atmospheric pressure in the first cavity, can the change of atmospheric pressure in real-time supervision first cavity through the atmospheric pressure monitoring facilities, thereby judge the wearing and tearing condition of spare part in the testing arrangement according to the change of atmospheric pressure in the first cavity.

In some embodiments, a seal is provided between the piston and an inner wall of the first chamber for sealing between the first chamber and the second chamber.

By adopting the scheme, the sealing element is used for avoiding the situation that the air pressure in the first cavity is reduced because the air in the first cavity leaks to the second cavity from the space between the piston and the inner wall of the inner cavity, and the air pressure environment of the glue in the glue storage chamber cannot be accurately simulated; and the periphery wall and the ration jar direct contact of piston can be avoided to the sealing member, and in the test process, the sealing member replaces piston and ration jar inner wall relative slip, and the sealing member also can replace the piston to receive wearing and tearing, when producing the clearance between ration jar and piston, only need change the sealing member can to extension piston life and reduction test cost.

In the application, the quantitative cylinder simulates a rubber cylinder of a dispenser, the first cavity simulates a rubber storage chamber of the dispenser, the piston simulates a dispensing piston in the rubber cylinder of the dispenser, and in the test process, the pressure in the first cavity is increased to a certain high pressure through the boosting mechanism and is used for simulating a high-pressure environment in the rubber storage chamber after the feeding in the dispenser is completed; the drive mechanism drives the piston to linearly and reciprocally slide in the quantitative cylinder through the piston rod, when the piston moves towards the first cavity, the motion process of the glue in the first cavity is similar to the motion process of the glue in a glue storage chamber of the glue dispenser, the test device can truly reduce the working conditions of all parts in the glue dispenser, the period of a gap between the piston and the quantitative cylinder due to abrasion is tested through continuous tests, when the accumulated use duration of the glue dispenser is about to reach the abrasion period, the parts of the glue dispenser corresponding to the test device are maintained or replaced, glue leakage in the glue storage chamber is prevented, the step of regular maintenance of the glue dispenser is omitted, manpower is saved, and the working efficiency of the glue dispenser is improved.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and in order that the technical means of the embodiments of the present application can be clearly understood, the embodiments of the present application are specifically described below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a friction wear test device provided in an embodiment of the present application;

FIG. 2 is a schematic view of the assembly of the dosing cylinder and the piston according to an embodiment of the present application;

reference numerals: 1. a gas injector; 2. a gas injection pipe; 3. a dosing cylinder; 31. a first chamber; 32. a second chamber; 4. a piston mechanism; 41. a piston; 42. a piston rod; 5. a drive mechanism; 6. a seal member; 7. A one-way valve; 8. an air pressure monitoring device.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

The terms "comprising" and "having," and any variations thereof, in the description and claims of this application and the description of the drawings are intended to cover, but not to exclude, other elements. The word "a" or "an" does not exclude a plurality.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The following description will be given with the directional terms as they are shown in the drawings, and not intended to limit the specific structure of a frictional wear test device of the present application. For example, in the description of the present application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings for the convenience of description and simplicity of description only, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present application.

Further, expressions of directions indicated for explaining the operation and configuration of each member of a frictional wear test device of the present embodiment, such as the X direction, the Y direction, and the Z direction, are not absolute but relative, and although these indications are appropriate when each member of the battery pack is in the position shown in the drawings, when the positions are changed, the directions should be interpreted differently to correspond to the changes.

Furthermore, the terms "first," "second," and the like in the description and claims of the present application or in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, and may explicitly or implicitly include one or more of the features.

In the description of the present application, unless otherwise specified, "plurality" means two or more (including two), and similarly, "plural groups" means two or more (including two).

In the description of the present application, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., "connected" or "connected" of a mechanical structure may refer to a physical connection, e.g., a physical connection may be a fixed connection, e.g., a fixed connection by a fastener, such as a screw, bolt, or other fastener; the physical connection can also be a detachable connection, such as a mutual clamping or clamping connection; the physical connection may also be an integral connection, for example, a connection made by welding, gluing or integrally forming the connection. "connected" or "coupling" of circuit structures may mean not only physical coupling but also electrical or signal coupling, for example, direct coupling, i.e., physical coupling, or indirect coupling via at least one element therebetween, as long as electrical communication is achieved, or communication between the two elements; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the production process of the power battery, the casing of the battery cell and the electrode assembly are usually bonded by glue during the assembly process, and a dispenser is usually used when the casing or the electrode assembly is coated with glue.

The operating principle of the dispenser is as follows: glue in the feeding system is squeezed into a glue storage chamber formed by a glue cylinder and a glue dispensing piston through high pressure, after the glue is applied to the feeding system, the air pressure in the glue storage chamber reaches certain high air pressure, the glue storage chamber is connected with a glue dispensing nozzle through a feeding pipe, a valve is arranged at the joint of the glue dispensing nozzle and the feeding pipe, the air pressure in the glue storage chamber can be increased by pushing the glue dispensing piston to move until the glue storage chamber reaches certain pressure, the valve is pushed to be opened, and the glue flows out of the glue dispensing nozzle after flowing through the feeding pipe from the glue storage chamber, so that the glue dispensing operation can be carried out. However, the amount of the glue applied to the surface of the can or the electrode assembly during actual use is often less than a predetermined amount, resulting in weak adhesion of the can and the electrode assembly, which affects the quality of the battery.

The inventor finds that the above problems are caused by the fact that in the dispensing process, the dispensing piston slides in the rubber cylinder, the dispensing piston applies pressure to the glue, the glue moves along the inner wall of the rubber cylinder and finally flows out of the dispensing nozzle through the feeding pipe, and dynamic friction exists between the glue and the inner wall of the rubber cylinder; with the extension of the service life, in the dispensing machine equipment, not only the parts directly contacted with the glue can be worn, for example, the end surface of the dispensing piston close to the glue side, the inner wall of the glue cylinder and the glue outlet valve can be worn, but also the parts can be worn, especially the contact surface between the dispensing piston and the inner wall of the glue cylinder can be worn. These abrasions all influence the volume of glue that goes out of point gum machine to different extents. Wherein, after the wearing and tearing appear between some glue piston and the packing element inner wall, when there is the clearance between some glue piston and the packing element inner wall, store up glue indoor glue and can spill through this clearance, lead to scribbling the glue yield on the product and diminish, and then lead to the free shell of battery and the not firm condition emergence of electrode subassembly bonding. Therefore, it is necessary to study a cycle in which a gap occurs between the dispensing piston and the inner wall of the cartridge to replace the relevant parts before the gap occurs.

Through many tests and summaries, the inventor thinks that the factors influencing the period of the gap between the dispensing piston and the inner wall of the rubber cylinder mainly have three points: firstly, the friction force between the dispensing piston and the inner wall of the rubber cylinder is large or small; secondly, the friction force between the glue and the inner wall of the rubber cylinder is large or small; and thirdly, the dispensing piston and the rubber cylinder are made of materials.

In the above three factors, when any one of the factors changes, the period of the gap between the dispensing piston and the inner wall of the rubber barrel is affected. For example, when the fitting between the dispensing piston and the inner wall of the rubber cylinder is tighter, the friction force between the dispensing piston and the inner wall of the rubber cylinder is larger, and the period of the gap between the dispensing piston and the inner wall of the rubber cylinder is shorter; or, when the larger the dynamic friction coefficient of the glue moving along the inner wall of the rubber cylinder is, the larger the friction force between the glue and the inner wall of the rubber cylinder is, and the shorter the period of the gap between the glue dispensing piston and the inner wall of the rubber cylinder is; or, when the material hardness of the dispensing piston or/and the rubber cylinder is smaller, the period of the gap between the dispensing piston and the inner wall of the rubber cylinder is shorter.

However, in the same dispensing machine, the materials of the dispensing piston and the glue cylinder and the matching between the dispensing piston and the glue cylinder are not changed, so that the friction between the glue and the inner wall of the glue cylinder becomes the most important factor for influencing the period of the gap between the dispensing piston and the inner wall of the glue cylinder. Because different glue has different components and different particle hardness, the dynamic friction coefficients of the glue on the inner wall of the rubber cylinder are different, and therefore, under the same glue output, the abrasion degrees of the different glues on the rubber cylinder are different. Therefore, in the same dispenser, different glue is filled in the same rubber cylinder, and the abrasion periods between the dispensing piston and the inner wall of the rubber cylinder are different.

In the prior art, before a gap is generated between a dispensing piston of a dispensing machine and the inner wall of a rubber cylinder, the dispensing machine is stopped periodically to check whether the rubber cylinder and the dispensing piston need to be maintained or replaced. However, this method causes waste of labor and a reduction in the working efficiency of the dispenser.

In view of this, the embodiment of the present application provides a friction wear testing apparatus, which includes a quantitative cylinder 3, a piston mechanism 4, a driving mechanism 5, and a pressure-increasing mechanism; the dosing cylinder 3 has an inner cavity for accommodating glue; the piston mechanism 4 comprises a piston 41 and a piston rod 42, the piston 41 is positioned in the inner cavity and matched with the wall of the inner cavity to divide the inner cavity into a first cavity 31 and a second cavity 32, the glue is positioned in the first cavity 31, and the piston rod 42 extends out of the second cavity 32 and is connected with the driving mechanism 5 outside the dosing cylinder 3; the driving mechanism 5 is used for driving the piston 41 to move through the piston rod 42 so as to adjust the volume of the first chamber 31; the pressure increasing means communicates with the first chamber 31 for increasing the gas pressure of the first chamber 31.

One possible working process of the friction wear test device in the embodiment of the present application is as follows:

the pressure increasing mechanism is communicated with the first chamber 31 and supplies compressed gas to the first chamber 31, and the air pressure in the first chamber 31 where the glue is located is increased, wherein the air pressure is the first air pressure value P1.

The driving mechanism 5 pushes the piston rod 42, and the piston rod 42 drives the piston 41 to slide in the inner cavity of the dosing cylinder 3, when the piston 41 moves from the stroke starting position to the first chamber 31, the volume of the first chamber 31 gradually decreases, the piston 41 further compresses the gas in the first chamber 31, so that the gas pressure in the first chamber 31 further increases until the gas pressure in the first chamber 31 reaches the second gas pressure value P2, and at the same time, the glue moves to the side away from the second chamber 32 by the thrust of the piston 41.

The driving mechanism 5 returns the piston rod 42, the piston 41 returns to its stroke starting position, and the air pressure in the first chamber 31 is restored to the first air pressure value P1.

The technical scheme can really restore the actual working condition of the glue cylinder and the glue dispensing piston in the glue dispenser, and because in the glue dispenser, the air pressure in the glue storage chamber is gradually increased to a third air pressure value P '1 along with the glue conveying from the feeding system to the glue storage chamber through high pressure, the glue in the glue storage chamber is in the environment of the third air pressure value P' 1; in the glue discharging process of the glue dispenser, the glue dispensing piston in the glue dispensing cylinder moves towards the glue storage chamber, the space of the glue storage chamber is gradually reduced, and the glue dispensing piston further compresses gas in the glue storage chamber, so that the air pressure in the glue storage chamber is further increased until a fourth air pressure value P 'is reached'₂Then, a valve on the feeding pipe is opened, and the glue flows out from the glue dispensing nozzle along the feeding pipe; after the glue discharging is finished, the glue dispensing piston returns, and the pressure in the glue storage chamber is gradually restored to a third air pressure value P'₁. Wherein the third air pressure value P'₁And a first air pressure value P₁Correspondingly, a fourth air pressure value P'₂And a second air pressure value P₂Correspondingly, the glue in the first chamber 31 is similar to the glue in the glue storage chamber of the actual dispenser in environment and motion, and the quantitative cylinder 3 and the piston 41 can relatively truly restore the actual working condition of the glue dispensing cylinder and the glue dispensing piston of the dispenser, so that the test result of the friction and wear test device is accurate, and the friction and wear period between the glue dispensing piston and the inner wall of the glue dispensing cylinder of the dispenser under the actual working condition can be estimated.

The compressed gas delivered by the boosting mechanism is gas which does not affect the glue characteristic, for example, the glue of curing agent can be cured when meeting water, and the compressed gas delivered by the boosting mechanism needs to be dried; because of P 'in the dispenser'₁The range of (A) is generally 5 to 10MPa, and therefore, the range of the pressure-increasing means output pressure of the test apparatus is generally 5 to 10 MPa.

The glue cylinder in the glue dispenser is usually a cylinder, the section of the glue dispensing piston is also circular and is consistent with the shape and size of the section of the cavity of the glue cylinder, in order to simulate the actual working condition as far as possible, the inner cavity of the quantitative cylinder 3 of the test device can be set into a circular cavity, and the section of the piston 41 is circular and is matched with the inner cavity of the quantitative cylinder 3.

It will be understood that the engagement between the piston 41 and the dosing cylinder 3 is the engagement between the outer peripheral wall of the piston 41 and the inner cavity wall of the dosing cylinder 3, which engagement ensures that the piston 41 slides back and forth smoothly on the inner cavity wall of the dosing cylinder 3 without glue leaking between the outer peripheral wall of the piston 41 and the inner cavity wall of the dosing cylinder 3.

The assembly of the shell and the electrode assembly of the battery monomer usually adopts a two-component high-viscosity adhesive, which comprises at least one of a two-component epoxy adhesive, a polyurethane adhesive or an acrylic adhesive, the two-component high-viscosity adhesive generally comprises an adhesive A and an adhesive B, the two adhesives are generally stored separately before being mixed, generally, the adhesive A is a catalyst, and the adhesive B is a curing agent. When in use, the glue A and the glue B are mixed by a static mixing tube or other modes according to a specified proportion to form a glue solution; the glue in the embodiment of the application can be: one of epoxy glue, acrylic glue, polyurethane glue, single-component silicon rubber, double-component silicon rubber, anaerobic glue, silicone grease pouring glue and polyurethane pouring glue.

The driving mechanism 5 drives the piston 41 to slide back and forth in the inner cavity of the quantitative cylinder 3, and the stroke of the driving mechanism 5 determines the longest sliding distance of the piston 41. In order to simulate the working conditions in different rubber cylinders, the driving mechanism 5 can select a mechanism with adjustable stroke, and the boosting mechanism can select a mechanism with adjustable output air pressure value.

When the friction and wear test device is used for testing, a certain amount of glue in the first cavity 31 is repeatedly tested, the glue moves in the test process, the particles of the glue rub against each other to cause abrasion, the size and the form of the glue particles change, and the characteristics of the glue are influenced; in order to reduce the abrasion of the glue in the glue dispenser to the glue cylinder as much as possible, the glue in the testing device needs to be replaced periodically in the test so as to ensure the accuracy of the test result.

By adopting the scheme, the quantitative cylinder 3 simulates a rubber cylinder of a dispenser, the first cavity 31 simulates a rubber storage chamber of the dispenser, and the piston 41 simulates a dispensing piston in the rubber cylinder of the dispenser, so that in the test process, the air pressure in the first cavity 31 is increased to a certain high pressure by the boosting mechanism and is used for simulating a high-pressure environment in the rubber storage chamber after the feeding in the dispenser is completed; the driving mechanism 5 drives the piston 41 to linearly reciprocate in the quantitative cylinder 3 through the rod of the piston 41, when the piston 41 moves towards the first chamber 31, the capacity of the first chamber 31 of the quantitative cylinder 3 is reduced, the air pressure in the first chamber 31 is increased along with the reduction of the capacity, glue is pushed by the piston 41 to move in the direction away from the second chamber 32 in the first chamber 31 and gradually gathers between the piston 41 and the end wall of the first chamber 31, wherein the end wall of the first chamber 31 refers to the inner wall surface of the first chamber 31 opposite to the piston 41, the glue rubs against the wall of the first chamber 31 in the moving process, and the process is used for simulating the glue dispensing process of a glue dispenser, namely the glue dispensing piston slides towards the glue storage chamber in a glue cylinder, the glue dispensing piston applies pressure to the glue, and the glue moves along the inner wall of the glue cylinder; when the piston 41 moves towards the second chamber 32, the capacity of the first chamber 31 of the quantitative cylinder 3 is increased, the air pressure in the first chamber 31 is reduced, and the process is used for simulating the glue dispensing machine to return the glue dispensing piston to the initial position in the glue cylinder after glue dispensing; when the piston 41 moves towards the second chamber 32, the air pressures at different positions in the first chamber 31 also have differences, that is, the air pressure of the first chamber 31 at the side close to the piston 41 is rapidly reduced, the air pressure of the first chamber 31 at the side far from the piston 41 is relatively higher, the glue tends to move towards the second chamber 32 in the first chamber 31, the gathered glue is dispersed in the whole first chamber 31, and the state that the glue is dispersed in the whole first chamber 31 is used for simulating the state that a certain amount of glue is re-stored in the glue storage chamber.

In conclusion, in the test process of the friction wear device, when the piston 41 moves towards the first chamber 31, the motion process of the glue in the first chamber 31 is similar to the motion process of the glue in the glue storage chamber of the glue dispenser, the test device can truly restore the working conditions of a glue cylinder, a glue dispensing piston and the like in the glue dispenser, through continuous tests, the period of a gap between the piston 41 and the quantitative cylinder 3 due to wear is tested, when the accumulated use duration of the glue dispenser is about to reach the wear period, parts of the glue dispenser corresponding to the test device are maintained or replaced, so that glue leakage in the glue storage chamber is prevented, the step of regular maintenance of the glue dispenser is omitted, manpower is saved, and the working efficiency of the glue dispenser is improved.

In some embodiments, the driving mechanism 5 comprises a linear motor, and a mover of the linear motor is connected with the piston rod 42 to drive the piston rod 42 and the piston 41 to move along a straight line.

The linear motor is a mechanical energy that directly converts electric energy into linear motion, and does not require any intermediate conversion mechanism. The output end of the linear motor is a rotor of the linear motor, the rotor of the linear motor makes linear reciprocating motion, the rotor of the linear motor drives the piston rod 42, and the piston rod 42 further drives the piston 41 to make linear reciprocating motion, so that the piston 41 can make reciprocating sliding in the inner cavity of the quantitative cylinder 3.

In the using process of the dispensing machine, according to the needs of products, different requirements can be met on the glue discharging speed of the dispensing machine, the moving speed of the dispensing piston in the glue cylinder is in direct proportion to the glue discharging speed of the dispensing machine, and therefore the moving speed of the dispensing piston can be adjusted according to the glue discharging speed. In order to better simulate the moving speed of the dispensing piston, the speed at which the driving mechanism 5 pushes the piston 41 to move needs to be adjusted.

By making the drive mechanism 5 comprise a linear motor having a wide speed range, the speed of the linear movement can be adjusted according to the movement state of the dispensing piston to be simulated, and the linear motor is directly connected to the piston rod 42 without a transmission gap, so that the rigidity is high and the speed transfer accuracy is high. In addition, the permanent magnet of the linear motor is usually in a modular design, and the number of the modules can be increased or decreased according to the required length, so that the stroke can be regulated and controlled, the stroke length of one-time movement of the piston 41 can be adjusted, the piston can adapt to the movement stroke of the dispensing piston in the dispenser, and the wear cycle of each part in the tested testing device is closer to the wear cycle of the corresponding part in the actual dispenser.

In some embodiments, the drive mechanism 5 comprises a pneumatic cylinder, the output of which is connected to the piston rod 42 to drive the piston rod 42 and the piston 41 in a linear motion.

The pneumatic cylinder converts the pneumatic energy into linear reciprocating motion at the output end, the output end of the pneumatic cylinder drives the piston rod 42, and the piston rod 42 further drives the piston 41 to slide in the quantitative cylinder 3 in a reciprocating manner.

By adopting the scheme, the driving mechanism 5 is simple in structure and reliable in work, a speed reducing device can be omitted, no transmission gap exists, and the motion is stable.

In some embodiments, the driving mechanism 5 includes a screw, a nut, and a bidirectional rotating motor, an output shaft of the bidirectional rotating motor is coaxially connected with the screw to drive the screw to rotate, the nut is engaged with the screw to move linearly when the screw rotates, and the nut is connected with the piston rod 42 to drive the piston rod 42 and the piston 41 to move linearly.

It should be noted that the nut does not refer to a part which is matched with the screw rod to play a role in fastening, but refers to a transmission part which is matched with the screw rod to convert the rotary motion into the linear motion; the driving mechanism 5 is generally further provided with a guiding structure for preventing the nut from rotating along with the screw rod, for example, the guiding structure comprises a guide rail arranged in parallel with the screw rod, and the nut can move linearly along the guide rail; or the guide structure can also comprise a polished rod arranged in parallel along the lead screw, and the nut is provided with a guide hole capable of penetrating through the polished rod.

By adopting the scheme, the bidirectional rotating motor drives the screw rod to rotate, the screw rod is meshed with the nut to drive the nut to move, the nut can convert the rotating motion of the screw rod into self linear motion, and the nut drives the piston rod 42 to do linear motion; the bidirectional rotating motor can drive the screw rod to rotate bidirectionally, and then the nut can drive the piston rod 42 and the piston 41 to do linear reciprocating motion; the driving mechanism 5 has high axial rigidity and high transmission efficiency.

In some embodiments, the pressure boosting mechanism comprises a gas injection pipe 2 and a gas injector 1, one end of the gas injection pipe 2 is communicated with the first chamber 31, and the other end of the gas injection pipe 2 is communicated with the output end of the gas injector 1, and is used for introducing the gas output by the gas injector 1 into the first chamber 31.

The gas injection pipeline 2 can be a hose made of rubber or a corrugated hose made of metal, can convey gas and can bear the pressure of high-pressure gas of 5-10Mpa output by the pressure boosting mechanism; the connection point of the gas injection pipe 2 and the first chamber 31 may be provided on the end wall of the first chamber 31, or may be provided at a position where the peripheral wall of the first chamber 31 is close to the end wall.

The gas injector 1 may be a gas pump, and the gas injected into the first chamber 31 may be nitrogen, air, or the like.

By adopting the above scheme, the gas injector 1 outputs compressed gas, the compressed gas enters the first chamber 31 through the gas injection pipeline 2, and the compressed gas forms certain high air pressure in the first chamber 31, so that when the driving mechanism 5 does not drive the piston 41 to move, the glue in the first chamber 31 is always in certain high air pressure P₁In the environment; the high-pressure environment simulates the environment of a glue storage chamber after the feeding is finished in the dispenser. Gas injection spare 1 passes through gas injection pipeline 2 and first cavity 31 intercommunication, and gas injection pipeline 2 can be to the arbitrary direction bending for gas injection spare 1's position sets up more in a flexible way, and the requirement of test device to the space reduces.

In some embodiments, the gas injector 1 includes a gas pump, and an outlet end of the gas pump is communicated with the gas injection pipe 2 to inject gas into the first chamber 31.

Wherein, the end of giving vent to anger of air pump can set up the filter equipment who filters moisture, avoids curing agent class glue to meet the water distribution and takes place the solidification.

Through adopting above-mentioned scheme, the air pump can compressed gas produce atmospheric pressure, and the compressed gas that the air pump produced gets into first chamber 31 through gas injection pipeline 2, and then increases the atmospheric pressure in first chamber 31.

In some embodiments, the gas injector 1 comprises a cylinder, and a rodless cavity of the cylinder is connected to the gas injection pipe 2 to introduce gas in the rodless cavity into the first chamber 31.

It can be understood that a compression piston is arranged in the cylinder, the compression piston divides the cylinder into a rodless cavity and a rod cavity, a cavity extending out of a piston rod of the compression piston is the rod cavity, the other cavity in the cylinder is the rodless cavity, the rodless cavity is provided with an air suction channel and an output channel, and the air injection pipeline 2 is connected with the output channel. The compression piston slides in the cylinder and makes the space increase in rodless chamber, and the passageway of breathing in rodless chamber is opened, and rodless intracavity gas pressure step-down, gas get into rodless intracavity, and when compression piston reverse slip, compression rodless chamber makes rodless chamber space diminish, and gas is compressed, and when reaching certain pressure, compressed gas discharges from the delivery channel in rodless chamber, gets into first cavity 31 through gas injection pipeline 2.

The gas of cylinder output can be gas such as nitrogen gas, air, for the characteristic of guaranteeing glue in the first cavity 31 can not produce the change, can set up filter equipment or drying device who filters moisture in the output channel of rodless chamber or in the passageway of breathing in, avoids curing agent class glue to meet the water distribution and take place the solidification.

Through adopting above-mentioned scheme, through the capacity size that reduces the rodless chamber of cylinder for the rodless chamber output compressed gas of cylinder, compressed gas gets into first cavity 31 through gas injection pipeline 2, and then increases first cavity 31 internal gas pressure.

In some embodiments, the gas injection pipe 2 is provided with a check valve 7, and the check valve 7 is used for limiting the gas in the first chamber 31 from flowing out through the gas injection pipe 2.

The one-way valve 7 may be a ball-shaped one-way valve 7.

The compressed gas delivered by the pressure boosting mechanism can smoothly enter the first chamber 31 through the check valve 7 in the gas injection pipeline 2, so that the gas pressure in the first chamber 31 is increased, but the gas in the first chamber 31 cannot flow out of the gas injection pipeline 2 through the check valve 7, so that the constant high gas pressure in the first chamber 31 is maintained; the driving mechanism 5 drives the piston 41 to slide, when the volume of the first chamber 31 is further compressed, the air pressure in the first chamber 31 increases, the gas tends to flow out from the gas injection pipe 2, and the gas in the first chamber 31 cannot flow out because the check valve 7 is arranged on the gas injection pipe 2.

By adopting the above scheme, the check valve 7 is used to ensure that the gas in the first chamber 31 does not flow out through the gas injection pipe 2, so that the first chamber 31 maintains a high-pressure environment to more accurately simulate the environment of the glue storage chamber, and prevent the glue in the first chamber 31 from flowing out along the gas injection pipe 2.

In some embodiments, the frictional wear test apparatus further comprises a gas pressure monitoring device 8 for monitoring the gas pressure within the first chamber 31.

The air pressure monitoring device 8 may be disposed on the air injection pipe 2 between the check valve 7 and the first chamber 31, and the detection end of the air pressure monitoring device extends into the air injection pipe 2; the air pressure monitoring device 8 may also be arranged on the dosing cylinder 3 with its monitoring end extending into the first chamber 31. In some embodiments, the air pressure detection device may be a digital air pressure sensor.

The air pressure monitoring device 8 can measure the air pressure value in the first chamber 31 at each moment, and know the air pressure change in the first chamber 31, so as to monitor the working state and the wear state of the test device. When the boosting mechanism injects gas into the first chamber 31, whether the first pressure value P in the first chamber 31 is reached can be intuitively monitored by the pressure monitoring device 8₁(ii) a When it is known from the air pressure monitoring device 8 that the first air pressure value P has been reached in the first chamber 31₁Then, the driving mechanism 5 is turned on, so that the driving mechanism 5 starts to drive the piston 41 to move towards the direction of the first chamber 31, and the air pressure value displayed on the air pressure monitoring device 8 can be checked in the process until the air pressure reaches the second air pressureValue P₂. When the driving mechanism 5 returns, whether the air pressure in the first chamber 31 is reduced to P or not can be visually judged through the air pressure value displayed on the air pressure monitoring device 8₁And accordingly controls the movement of the drive mechanism 5. When the air pressure of the driving mechanism 5 in the first chamber 31 is P₂With a slight pause, e.g. a pause time T, during which the gas monitoring device detects that the gas pressure in the first chamber 31 is below P₂It is preliminarily judged that a worn clearance is present between the piston 41 and the inner cavity wall of the dosing cylinder 3. This is because, when a gap occurs between the piston 41 and the inner wall of the quantitative cylinder 3, since the first chamber 31 has a high air pressure, and there is an air pressure difference between the first chamber 31 and the second chamber 32, the air in the first chamber 31 leaks into the second chamber 32, so that the air pressure in the first chamber 31 decreases, and therefore, the air pressure monitoring device 8 can monitor the change in the air pressure in the first chamber 31 in real time, and determine the wear condition of the components in the test apparatus according to the change in the air pressure in the first chamber 31.

In some embodiments, a seal 6 is provided between the piston 41 and the inner wall of the first chamber 31 for sealing between the first chamber 31 and the second chamber 32.

The seal 6 may be a part of the piston 41 itself, i.e., the outer circumferential surface of the piston 41; because the entire part of the piston 41 needs to be replaced after the piston 41 is worn, a sealing ring made of wear-resistant material such as PTFE (polytetrafluoroethylene) or UPE (ultra high molecular weight polyethylene) may be sleeved on the outer circumference of the piston 41 to serve as the sealing member 6. Thus, the sealing member 6 is arranged between the piston 41 and the inner cavity wall of the quantitative cylinder 3 to ensure that the air and glue are not leaked, and the sealing member 6 is attached to the inner cavity wall of the quantitative cylinder 3 by the elasticity of the sealing member 6, so that the compressed air and the glue can not pass between the sealing member 6 and the quantitative cylinder 3.

By adopting the above scheme, the sealing element 6 is used for preventing the gas in the first chamber 31 from leaking to the second chamber 32 from the space between the piston 41 and the inner wall of the inner cavity to cause the reduction of the gas pressure in the first chamber 31, and the situation that the gas pressure environment of the glue in the glue storage chamber cannot be accurately simulated occurs; and the periphery wall of the piston 41 can be prevented from directly contacting the quantitative cylinder 3 by the sealing member 6, in the test process, the sealing member 6 replaces the piston 41 to slide relative to the inner wall of the quantitative cylinder 3, the sealing member 6 can also replace the piston 41 to be worn, and when a gap is generated between the quantitative cylinder 3 and the piston 41, only the sealing member 6 needs to be replaced, so that the service life of the piston 41 is prolonged, and the test cost is reduced.

For example, a dispenser, the dispenser includes the packing element, the glue that uses in this packing element is a heat conduction glue, feeding system in this dispenser is through high pressure with this heat conduction glue according to 100 g/time squeeze into glue storage chamber after, the atmospheric pressure in the glue storage chamber reaches 10Mpa, this dispenser is when carrying out some glue jobs, the point gluing piston moves with the speed of 15mm/s (millimeter per second), the travel distance is 40mm, in the removal process, the highest atmospheric pressure in glue storage chamber is 15Mpa, after using for a long time, packing element and some glue piston all have wearing and tearing. In order to test the period of the gap generated between the rubber cylinder and the rubber dispensing piston of the rubber dispensing machine so as to repair or replace the parts of the rubber dispensing machine before the gap is generated, the following friction and wear test device is adopted for testing.

The friction wear test device comprises a quantitative cylinder 3, a piston mechanism 4, a driving mechanism 5, an air pressure monitoring device 8 and a pressure-increasing mechanism; the quantitative cylinder 3 simulates a rubber cylinder of a dispenser, the first chamber 31 simulates a rubber storage chamber of the dispenser, and the piston 41 simulates a dispensing piston; the quantitative cylinder 3 is provided with an inner cavity, the piston mechanism 4 comprises a piston 41 and a piston rod 42, the piston 41 is positioned in the inner cavity, a sealing ring is arranged on the circumferential wall of the piston 41, the outer circumferential surface of the sealing ring is matched with the inner wall of the inner cavity, the piston 41 divides the inner cavity into a first cavity 31 and a second cavity 32, the first cavity 31 is used for containing glue, and the piston rod 42 extends out of the second cavity 32 and is connected with the driving mechanism 5 outside the quantitative cylinder 3; the driving mechanism 5 is a linear motor, the testing end of the air pressure monitoring device 8 extends into the first chamber 31 for monitoring the air pressure in the first chamber 31, and when the air pressure of the driving mechanism 5 in the first chamber 31 is P₂The time is 0.5 second, and when the gas monitoring device monitors that the pressure in the first chamber 31 is lower than 15MPa during the pause of the driving mechanism 5, the preliminary judgment of the piston 41 and the quantitative cylinder 3 can be carried outWear gaps between the inner chamber walls occur. The pressure boosting mechanism comprises a gas injection pipeline 2 and a gas injection member 1, one end of the gas injection pipeline 2 is communicated with the first cavity 31, the other end of the gas injection pipeline 2 is communicated with the output end of the gas injection member 1, and a one-way valve 7 is arranged on the gas injection pipeline 2. Wherein, the glue placed in the first chamber 31 is heat-conducting glue, the weight is 100g, the pressure-increasing mechanism is used for pressurizing the first chamber 31, and the air pressure in the first chamber 31 is 10 Mpa; the linear motor then moves the piston 41 in the direction of the first chamber 31 at a movement speed of 15mm/s with a movement path of 40 mm. The testing device simulates the process of returning the dispensing piston in the glue cylinder in the dispenser during the movement process of returning the piston 41, however, it should be noted that in the actual dispenser, the feeding system will supplement 100g of glue into the glue storage chamber during the process, but the testing device does not supplement the glue, and a certain amount of 100g of glue moves repeatedly in the first chamber 31.

The friction wear test device works continuously, the heat conducting glue in the first chamber 31 is replaced once every twenty-four hours, and after 2160 hours (about 90 days), the air pressure monitoring device 8 displays that the air pressure is abnormal and is lower than 10 Mpa; the worker stops the test device to check, removes the sealing ring on the piston 41, and after checking, the sealing ring, the inner cavity wall of the quantitative cylinder 3 and the end face of the piston 41 close to the glue are worn, especially the circumferential face of the sealing ring in contact with the quantitative cylinder 3 is worn seriously, and the glue is arranged in the second chamber 32. It is inferred that the sealing ring at this time does not guarantee the absence of clearance between the piston 41 and the dosing rod 3, so that the glue leaks from the first chamber 31, and therefore, it is preliminarily concluded: when the heat-conducting glue is used, the friction and wear period of the equipment is 89 days, if the glue output of the glue dispenser continuously works every day is 500g, the glue dispenser is shut down to overhaul the equipment and replace parts in time when the accumulated glue output reaches 1080Kg by calculation.

The application is also suitable for the abrasion test of other solid particles and colloid materials under the working condition similar to a glue dispenser, and the embodiments of the application are not listed one by one.

Those skilled in the art will appreciate that although some embodiments herein include some features included in other embodiments, not others, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A friction wear test device which characterized in that: comprises a quantitative cylinder, a piston mechanism, a driving mechanism and a boosting mechanism;

the quantitative cylinder is provided with an inner cavity and is used for containing glue;

the piston mechanism comprises a piston and a piston rod, the piston is positioned in the inner cavity and divides the inner cavity into a first cavity and a second cavity, the glue is positioned in the first cavity, and the piston rod extends out of the second cavity and is connected with the driving mechanism;

the driving mechanism drives the piston to move through the piston rod;

the pressure increasing mechanism is communicated with the first chamber and used for increasing the air pressure of the first chamber.

2. The frictional wear test apparatus of claim 1, wherein: the driving mechanism comprises a linear motor, and a rotor of the linear motor is connected with the piston rod.

3. The frictional wear test apparatus of claim 1, wherein: the driving mechanism comprises a pneumatic cylinder, and the output end of the pneumatic cylinder is connected with the piston rod.

4. The frictional wear test apparatus of claim 1, wherein: the driving mechanism comprises a screw rod, a nut and a bidirectional rotating motor, an output shaft of the bidirectional rotating motor is coaxially connected with the screw rod to drive the screw rod to rotate, the nut is meshed with the screw rod to enable the nut to move along a straight line when the screw rod rotates, and the nut is connected with the piston rod.

5. The frictional wear test apparatus of claim 1, wherein: the pressure boosting mechanism comprises a gas injection pipeline and a gas injection member, one end of the gas injection pipeline is communicated with the first cavity, and the other end of the gas injection pipeline is communicated with the output end of the gas injection member.

6. The frictional wear test apparatus of claim 5, wherein: the gas injection piece comprises a gas pump, and the gas outlet end of the gas pump is communicated with the gas injection pipeline.

7. The frictional wear test apparatus of claim 5, wherein: the gas injection piece comprises a cylinder, and a rodless cavity of the cylinder is connected with the gas injection pipeline.

8. The frictional wear test apparatus of claim 5, wherein: and a check valve is arranged on the gas injection pipeline and is used for limiting the gas of the first cavity to flow out through the gas injection pipeline.

9. The frictional wear test apparatus of claim 8, wherein: the friction wear test device further comprises air pressure monitoring equipment for monitoring the air pressure in the first cavity.

10. The frictional wear test apparatus of claim 8, wherein: a sealing element is arranged between the piston and the inner wall of the first chamber and used for realizing sealing between the first chamber and the second chamber.