Self-cleaning accurate filling device for multifunctional carbon fiber friction material

Abstract

The invention provides a self-cleaning precise filling device for a multifunctional carbon fiber friction material. The problems that an existing quantitative feeding device is low in material conveying precision and leakage exists in the material conveying process are solved. The valve assembly is installed at the inlet end of the material conveying unit, the control precision of feeding is improved, the material conveying distance is shortened and powder loss in the conveying process is reduced by means of turnover conveying of the material conveying roller in the material conveying process, and a material scraping impeller is arranged in the compensation unit to conduct compensation conveying on residual powder in an arc groove of the material conveying roller and achieve the self-cleaning function. And meanwhile, the feedback effect of the control unit on the whole mechanical structure is introduced, feeding parameters are adjusted in real time according to working conditions, and the precision and stability of the whole die quantitative feeding procedure are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of friction plate manufacturing, and in particular relates to a self-cleaning precise filling device for carbon fiber multifunctional friction material. Background Art

[0002] Friction materials are a common composite material in daily life and are widely used in automobiles, trains, generators, agricultural machinery and other equipment. With the continuous development of modern science and technology, people have put forward higher requirements on the performance of friction materials. Carbon fiber reinforced friction materials are a type of friction material made of carbon fiber as a reinforcement. The main components include carbon fiber, resin and other binders. It has good properties of light weight, high strength, high temperature resistance and wear resistance. However, with the rapid development of high-end mechanical equipment, the transmission friction pairs of major equipment such as new fighters, heavy machinery and armored vehicles are required to serve in extreme working conditions such as ultra-low temperature, ultra-high load and ultra-large torque, which places extremely high requirements on the transmission / braking characteristics and wear resistance of friction materials. Researchers usually modify the materials to meet the multi-functional requirements of friction materials such as anti-low temperature adhesion, high load and efficient braking. However, it is worth noting that high-precision powder filling during the material preparation process also has a significant impact on the final performance of the multifunctional friction material; if the device feeds too much powder, it will not only increase the density of the final friction plate product, but also exceed the maximum density of the compressible powder on the flat vulcanizer, resulting in an increase in the thickness of the friction plate and a change in size, which does not meet the product specification requirements; if the device feeds too little powder, it will cause the density of the product to decrease, and then cause the performance of the friction plate (such as hardness, etc.) to decrease, affecting the multifunctional use requirements. Therefore, the design and development of a carbon fiber reinforced friction material precision filling device with a control system to improve the powder feeding accuracy during the weighing process has very important practical significance for improving the performance of the final molded product of the friction plate.

[0003] In the processing of friction plates, the existing automated devices are mainly focused on mixing, hot pressing and other aspects, and are relatively rare in quantitative powder feeding. The existing quantitative powder feeding devices are often used in other industries, such as coal processing, food packaging, etc. According to different feeding principles, this device can be divided into spiral type, rotary type, electromagnetic vibration type and pneumatic powder feeding type.

[0004] Chinese patent CN217516269U provides a double-tube spiral quantitative feeding device. This mechanism can realize steady flow conveying and weighing measurement of materials through the upper steady flow conveying pipe and the lower dynamic metering pipe, thereby quantitatively conveying materials; however, the longer spiral pipe design in this mechanism increases the conveying distance of the powder, which not only increases the cost of the equipment, but also causes the powder to adhere to the inner wall of the pipe during transportation, resulting in unnecessary losses.

[0005] Chinese patent CN221564534U provides a vibrating feeder. The mechanism achieves stable transportation of materials by adjusting the angle of the conveying trough through vibration; however, when the mechanism is working, there will be a small amount of residual powder in the conveying trough, and due to the large vibration and noise generated during operation, it will have a certain degree of impact on the health of workers.

[0006] Chinese patent CN106882604B provides a disc-type powder quantitative feeding device. The device uses a turntable and spiral blades to achieve quantitative transportation; however, during the transportation process, powder still adheres to the turntable and the spiral pipe, and no suitable residual material processing device is provided.

[0007] Chinese patent CN118149354B provides an experimental gas-powder mixing linear continuous powder feeder. The device first sets up a main material bin to add powder and stir it, then uses gas to transport the powder, and uses a powder removal device at the connecting pipe to compensate for the powder transport, so as to achieve the purpose of quantitative feeding; however, during the pneumatic conveying process, the material is easy to be blocked at the bend of the guide pipe, and the equipment is seriously worn.

[0008] It can be seen that the existing quantitative powder feeding devices have a certain degree of powder leakage, and there are still defects in the control of feeding accuracy. They are rarely used in the production of friction plates and are not suitable for the stability requirements of the physical and chemical properties of carbon fiber multifunctional friction materials. Therefore, the development of a high-precision quantitative powder feeding device that does not change the physical and chemical properties of carbon fiber multifunctional friction materials is crucial to improving the accuracy and stability of the quality of the finished carbon fiber composite friction plate. Summary of the invention

[0009] The purpose of the present invention is to solve the shortcomings of the existing quantitative feeding device, such as low feeding accuracy and leakage in the feeding process, and to provide a self-cleaning and precise filling device for carbon fiber multifunctional friction material.

[0010] The concept of the present invention:

[0011] Taking into account the accuracy problems of existing feeding devices (also called filling devices), and combining with the requirements of carbon fiber composite friction plates for uniform physical and chemical properties of the friction powder used, the present invention intends to specifically design a self-cleaning precision filling device for carbon fiber multifunctional friction materials, that is, a precision feeding device used in the preparation of friction plates.

[0012] Carbon fiber multifunctional friction materials have high strength and wear resistance, and are mostly used in high-performance braking systems, such as aircraft brake pads, high-end car brake pads, etc. In these applications, the stability and reliability of the materials are extremely high, and the powder of carbon fiber multifunctional friction materials is extremely fluffy and fine. It is not only easy to be compressed during transportation, but also easy to adhere to parts. It is not suitable for feeding in a way that may introduce impurities or affect the performance of the material, such as the aforementioned spiral, rotary, electromagnetic vibration and pneumatic powder feeding methods; at the same time, carbon fiber multifunctional friction materials are not easy to generate a lot of dust. Even if dust is generated, it is difficult to effectively treat it through gas blowing due to its characteristics. Gas blowing has instability factors, which may change the composition state of each powder raw material, causing each component of the raw material to be unstable. The distribution of carbon fiber multifunctional friction material powder is uneven, which in turn affects the performance of the final product (the components of carbon fiber multifunctional friction material powder are complex. In actual use, different raw materials will be selected according to different needs and mixed in proportion. Whether the mixing is uniform will have a certain impact on the performance of the final friction plate). It can be seen that for the transportation of carbon fiber multifunctional friction material powder, we should not only pay attention to the transportation accuracy, but also pay attention to the uniformity and quality accuracy of the conveyed powder. That is, in the process of conveying, we should try our best to avoid introducing factors that affect the physical and chemical properties of the powder, to prevent changes in the powder, which may cause changes in properties such as density, and affect the performance of the final product.

[0013] Based on this, the present invention designs the following self-cleaning precise filling device for carbon fiber multifunctional friction material by shortening the feeding distance as much as possible and avoiding factors that affect the quality and weight of the powder. The specific technical solution is as follows:

[0014] The self-cleaning precise filling device of carbon fiber multifunctional friction material is special in that it includes a supporting platform, a material storage unit, a material feeding unit, a compensation unit and a control unit;

[0015] The support platform comprises an upper support platform and a lower support platform stacked up and down;

[0016] The material storage unit is arranged on the upper support platform, and conveys powder (the powder is carbon fiber multifunctional friction material powder) to the material feeding unit located on the lower support platform through the feeding pipe; the material storage unit plays a role of temporary storage and buffering for the powder, preventing the filling speed from being too fast and making it difficult to control the accuracy;

[0017] The feeding unit is mainly used to quantitatively convey the powder, and comprises a feeding roller, a feeding roller driving motor, a protective sleeve and a sealing ring;

[0018] The feed roller includes a tail section, a first sealing protection section, a feed groove section, a second sealing protection section and a driving connection section which are connected in sequence along the axial direction, and a sealing groove is provided at the connection between each section; the feed roller is sleeved in the protective sleeve; the sealing ring is provided in the sealing groove and is fixedly connected to the protective sleeve;

[0019] The groove section of the feeding roller is provided with two arc grooves for containing powder along the circumferential direction; a spacing is left between the two arc grooves, and the spacing corresponds to a central angle of 30±5° (so that interference with the subsequent scraping impeller caused by too small a spacing can be avoided, and the powder scraped by the scraping impeller can be avoided from falling outside the discharge port due to too large a spacing), and the central angle corresponding to each arc groove is 40±5° (the central angle corresponding to each arc groove should not be too large or too small; if the central angle is too small, the mass of the transported powder will be too small, resulting in low feeding efficiency; if the central angle is too large, the radius of the scraping impeller will increase significantly. In order to avoid interference with the outer shell, the height of the outer shell needs to be further adjusted to affect the compensation effect);

[0020] The feed roller driving motor is connected to the driving connection section of the feed roller, driving the feed roller to rotate relative to the protective sleeve and the sealing ring. When the arc groove faces downward, the powder contained therein falls down autonomously under the action of gravity. In this process, no external force factors that affect the physical and chemical properties of the powder are introduced, thereby ensuring the stability of the powder performance.

[0021] The protective sleeve is symmetrically provided with two openings at the top and bottom of the groove section of the feed roller, and each opening can expose the two arc grooves at the same time; the feed pipe is adapted to extend into the top opening of the protective sleeve (the top opening is rectangular), and an elastic sleeve (also called an elastic blocking strip, which is mainly installed on both sides of the feed pipe parallel to the axis of the feed roller) in contact with the groove section of the feed roller is provided at its end, and the elastic sleeve can just cover the gap between the feed pipe and the feed roller to prevent the powder from falling from the gap and causing feeding errors;

[0022] The compensation unit includes a shell and two sets of compensation cleaning mechanisms. The compensation unit is responsible for compensating and conveying a small amount of powder that adheres to the inner wall of the arc groove of the feeding roller and fails to be filled in time, so as to achieve a self-cleaning effect.

[0023] The shell is located between the lower support platform and the feeding unit, the top of which is adapted to the bottom of the protective cover, and the top is provided with a through hole that docks with the bottom opening of the protective cover, and the bottom is provided with a discharge pipe adapted to pass through the lower support platform;

[0024] Two groups of compensating cleaning mechanisms are symmetrically arranged at the two ends of the shell, and are respectively used to scrape off the powder adhered to the inner walls of the two arc grooves of the feeding roller, that is, the compensating cleaning mechanisms are arranged one by one corresponding to the arc grooves, and one group of compensating cleaning mechanisms performs compensating cleaning operations on one arc groove;

[0025] The roughness of the inner wall of the protective sleeve and the inner wall of the outer shell is not higher than 0.4 μm, so as to ensure that the powder material is smooth enough so that it will not stick to the inner wall of the protective sleeve and the inner wall of the outer shell during the turning and transportation process and the material unloading process, thereby reducing the loss during the material transportation process;

[0026] The control unit includes a host computer, a strain type torque sensor and a data processing module; the strain type torque sensor is arranged at the tail end of the feed roller, and is used to measure the rotation torque of the feed roller drive motor; the strain type torque sensor transmits the torque signal to the data processing module for processing into a powder quality signal, and then feeds back to the host computer for accumulation; the host computer adjusts the working state of each electrical component in the device according to the feedback signal. Among them, the strain type torque sensor has a negative feedback closed-loop control effect on the entire self-cleaning precision filling device, and its working principle is: when the last filling is performed, the host computer sends a feedback signal, which first acts on the drive motor of the valve assembly to reduce the valve opening, thereby slowing down the discharge speed, and then acts on the feed roller drive motor to reduce the speed, so that the filling rate of the powder in the mold of the next process link is gradually reduced, and when the feeding progress reaches 100%, the feed roller drive motor stops working, and the valve assembly of the storage unit is completely closed to prevent exceeding the set value of the feeding. At the same time, the host computer also controls each drive motor in the compensation unit. After the feeding of a mold is completed, the compensation cleaning mechanism no longer works (that is, the worm gear no longer rotates, and the scraper impeller controlled by the connecting rod will move away from the arc groove of the feed roller).

[0027] The strain-type torque sensor detects the torque required by the feed roller drive motor to drive the feed roller and the powder to rotate each time, and uses the data processing module to convert the torque signal into a powder quality signal and transmit it to the host computer. The measurement principle is: M = Jα, where α is the angular acceleration, which is a fixed parameter of the feed roller drive motor, and J is the rotational inertia of the feed roller and the powder, which can be obtained by Calculate, R is the radius of the feed roller, m is the total mass of the feed roller and the powder, so the mass of the powder filled each time can be obtained. It is worth noting that during each rotation of the feed roller, the driving torque measured by the strain torque sensor includes not only the overturning torque of the feed roller and the powder itself, but also the friction torque to overcome the contact between the elastic sleeve and the feed roller. To ensure accurate calculation, this part of the friction torque should be removed. The friction torque can be calculated in advance. The principle is: T = μFR, where T is the friction torque, μ is the dynamic friction coefficient at the contact between the elastic sleeve and the feed roller, F is the pressure of the elastic sleeve on the feed roller, and R is the radius of the feed roller.

[0028] During each powder filling process, the upper computer will compare the set mass of powder to be added to the mold with the total mass of the accumulated powder, and adjust the parameters of each component in real time according to the feeding conditions until the mold is accurately filled. When preparing to fill the next mold with powder, the feed roller drive motor will continue to drive the feed roller to rotate and feed, and the strain torque sensor will monitor the quality of the newly added powder to ensure the accuracy of each filling, and it will reciprocate in sequence until the end.

[0029] Furthermore, each set of compensating cleaning mechanisms includes a scraper assembly, a connecting rod assembly, a worm gear assembly, and a hydraulic assembly;

[0030] The scraper assembly is located in the housing, and includes a scraper impeller and a scraper impeller connecting shaft; the scraper impeller is coaxially mounted on the scraper impeller connecting shaft, and the scraper impeller connecting shaft is used as a rotation axis, and its rotation radius is equal to the radius of the arc surface of the arc groove, so that the scraper impeller cleans and rubs the inner wall of the arc groove during the subsequent compensation conveying process to achieve a better compensation conveying effect of the powder;

[0031] The connecting rod assembly and the worm gear assembly are respectively arranged on two sides of the housing;

[0032] The connecting rod assembly is connected to one end of the scraper impeller connecting shaft, and is used to control the scraper assembly to move horizontally in the housing, and drive it to move away from or close to the circular arc groove of the feed roller; when the scraper impeller connecting shaft is driven by the connecting rod assembly to a position close to the circular arc groove of the feed roller, the scraper impeller is coaxial with the circular arc groove of the feed roller;

[0033] The worm gear assembly is connected to the other end of the scraper impeller connecting shaft, and is used to control the scraper assembly to rotate in the housing, driving it to scrape off the powder adhered to the inner wall of the arc groove of the feed roller; the scraper impeller connecting shaft can rotate under the drive of the worm gear, and when it rotates to the point where the scraper impeller faces downward, the powder scraped from the arc groove by the scraper impeller will fall to the discharge port under the action of the rotating centrifugal force and gravity, thereby ensuring high-precision feeding;

[0034] The hydraulic assembly is used to achieve the meshing and separation of the worm wheel and the worm in the worm gear assembly.

[0035] Furthermore, the scraping impeller includes blades, a connecting rod and a connecting sleeve; the blades are connected to the connecting sleeve through the connecting rod; the curvature of the blade surface is the same as the curvature of the arc groove, and a receiving groove is provided on the surface, and both ends of the surface are set as inclined surfaces, which is convenient for the first scraping of powder, and the powder scraped out for the first time will automatically fall down; the scraping impeller connecting shaft is installed in the connecting sleeve, and both ends of it extend out of the connecting sleeve; wherein, the blades are made of smooth and non-adhesive material, the four groove walls of the receiving groove are set as inclined surfaces, and among the two groove edges arranged in sequence on the surface of the receiving groove along the scraping direction, the groove edge located on the rear side of the scraping direction is slightly higher than the groove edge located on the front side of the scraping direction, so that the inner wall of the arc groove can be cleaned again by using the higher groove edge, and the powder scraped for the second time can fall into the receiving groove just right, so as to better contain the powder.

[0036] Furthermore, the shell is a rectangular parallelepiped, with an inlet on the top and an outlet on the bottom; the inlet is seamlessly connected to the bottom opening of the protective cover, the outlet is seamlessly connected to the discharge pipe, and the outlet size is slightly larger than the inlet size on the basis of matching the subsequent process flow, that is, the outlet size is not larger than the size of the friction plate, so as to prevent the powder from falling to a position outside the mold and causing loss;

[0037] Two sets of guide grooves are symmetrically arranged on two opposite sides of the housing; the two sets of guide grooves are respectively used to install the scraper impeller connecting shafts of the two sets of compensation cleaning mechanisms; the two guide grooves located on the same side are located on the same horizontal plane, and the lengths of the two guide grooves are sufficient to ensure that when the scraper impeller connecting shaft moves to the inner limit position of the guide groove (that is, when the scraper impeller is close to the arc groove of the feed roller) under the drive of the connecting rod assembly, the scraper impeller connecting shaft is coaxial with the groove surface of the arc groove, and the two scraper impellers do not interfere with each other when rotating;

[0038] The other two opposite side inner walls of the shell are inclined from top to bottom toward the outlet to form inclined surfaces, and the two inclined surfaces do not interfere with the rotation of the two scraping impellers.

[0039] Furthermore, a first mounting through hole is provided in the middle of the tabletop of the upper support platform, and a second mounting through hole is provided in the middle of the tabletop of the lower support platform, and the two mounting through holes are coaxially arranged; wherein the feeding pipe is arranged at the first mounting through hole, and the discharging pipe is arranged at the second mounting through hole. In other words, the upper support platform provides support for the material storage unit, and the lower support platform provides support for the material feeding unit and the compensation unit, and the upper support platform and the lower support platform jointly connect the three parts of the material storage unit, the material feeding unit and the compensation unit into a compact whole.

[0040] Furthermore, the material storage unit includes a material storage barrel and a valve assembly;

[0041] The material storage barrel is located on the upper support platform, and is provided with a powder inlet on the top, a powder outlet and a support column (the support column mainly plays a role in positioning and installation) on the bottom; wherein the powder outlet is sealed and connected with the inlet of the feed pipe; the valve assembly is installed on the feed pipe, and the valve assembly includes a plug valve and a valve drive motor;

[0042] The feeding unit is installed on the lower support platform through a feeding unit connecting column, and the feeding unit connecting column is mainly used to support the feeding roller and the feeding roller driving motor;

[0043] The protective cover comprises a feed roller protective cover and a tail connection protective cover.

[0044] Further, the connecting rod assembly includes connecting rod I, connecting rod II, a connecting rod driving motor and a connecting rod driving motor connecting column;

[0045] The connecting rod driving motor is installed on the lower support platform through the connecting rod driving motor connecting column, and its output is connected to one end of the connecting rod I, the other end of the connecting rod I is hinged to one end of the connecting rod II, and the other end of the connecting rod II is coaxially connected to one end of the scraper impeller connecting shaft through a bearing.

[0046] Further, the worm gear assembly includes a worm gear, a worm drive motor, a worm drive motor connecting column, a support seat, a worm, and a worm drive motor auxiliary connecting column;

[0047] The worm drive motor is installed on the lower support platform through the worm drive motor connecting column, and its output is connected to one end of the worm, and the middle part of the worm is sleeved in the support seat installed on the lower support platform through the worm drive motor auxiliary connecting column;

[0048] The worm gear is coaxially mounted on the other end of the scraper impeller connecting shaft;

[0049] The hydraulic assembly synchronously lifts the worm drive motor to connect the column and the worm drive motor to assist in connecting the column, thereby achieving the engagement and separation of the other end of the worm and the worm wheel.

[0050] The working principle of the feeding unit in the above self-cleaning precision filling device is as follows: open the valve assembly of the storage unit, and the powder flows from the storage barrel to the arc groove of the feeding roller; under the driving action of the feeding roller driving motor, the feeding roller rotates 180° in the protective sleeve with the powder, and at this time, the arc groove of the feeding roller is just aligned with the discharge pipe. Under the action of gravity, the powder falls directly from the arc groove to the discharge pipe to realize the transportation of the powder. By arranging a sealing ring in the feeding roller, the loss caused by leakage during the transportation process can be reduced; in addition, a protective sleeve is arranged outside the feeding roller to isolate the outside air, which can prevent impurities from mixing into the powder and causing powder contamination; an elastic sleeve in contact with the feeding roller is arranged on the end face of the feeding pipe extending into the protective sleeve, which not only plays an auxiliary connection role, but also can further prevent the powder from falling into the protective sleeve through the gap between the feeding pipe and the feeding roller during transportation, thereby causing blockage and reduced feeding accuracy.

[0051] In addition, the present invention also provides a method for accurately feeding using the above-mentioned carbon fiber multifunctional friction material self-cleaning accurate filling device, which is special in that it includes the following steps:

[0052] 1) According to the product dosage requirements, determine the number of feeding times and the last feeding amount, and set the opening and duration of the valve assembly of the storage unit for each feeding;

[0053] 2) Adding carbon fiber multifunctional friction material powder into the storage barrel of the storage unit;

[0054] 3) According to the setting requirements of step 1), the upper computer controls the valve assembly of the material storage unit to open, and when the amount of powder in the arc groove reaches the set amount of this feeding, the valve assembly is closed;

[0055] 4) The upper computer starts the feed roller driving motor of the feed unit and controls the feed roller to flip 180°. The arc groove faces the bottom opening of the protective cover. The powder falls to the next process link through the shell of the compensation unit and the discharge pipe under the action of gravity. At the same time, the strain torque sensor is used to detect the torque used by the feed roller driving motor to flip the powder. The torque signal is converted into a powder quality signal through the data processing module and fed back to the upper computer for accumulation.

[0056] 5) The upper computer starts the connecting rod drive motors of the two sets of compensation cleaning mechanisms to control the two scraper impeller connecting shafts to move to the inner limit positions of their respective guide grooves;

[0057] 6) The upper computer starts the hydraulic components of the two sets of compensation cleaning mechanisms to synchronously raise the worm drive motor connection column and the worm drive motor auxiliary connection column, so that the worm and the worm wheel are meshed;

[0058] 7) The upper computer starts the worm drive motors of the two sets of compensation cleaning mechanisms, and controls the two scraper impeller connecting shafts to drive the scraper impellers to rotate, scrape off the powder adhering to the inner wall of the arc groove, and rotate the scraper impellers until the accommodating groove faces downward, and use gravity to make the powder in the accommodating groove fall through the discharge pipe to the next process link; at the same time, the upper computer controls each component to return to the initial state;

[0059] 8) Repeat steps 3)-7) until the last addition is completed.

[0060] The present invention also provides an equipment for preparing friction plates for high-performance brake systems, which is special in that the equipment uses the above-mentioned carbon fiber multifunctional friction material self-cleaning precision filling device to ensure accurate and lossless feeding in the precise feeding link, and the powder processing and subsequent process links in the equipment can all use existing technologies.

[0061] Advantages of the present invention:

[0062] 1. The feeding method of the present invention is different from the existing feeding method. The entire device relies on the gravity of the powder to complete the conveying. The principle is simple and can ensure the uniformity and quality accuracy of the carbon fiber friction material powder filling, further making the performance more uniform. The entire carbon fiber multifunctional friction material self-cleaning precision filling device realizes drive control of each unit according to the actual feeding conditions through the cooperation of the mechanical unit and the control unit to ensure the feeding accuracy, which is specifically manifested in the following aspects:

[0063] ① The control unit controls the valve assembly in the storage unit, and sets the number of flips of the feeding unit and the last feeding amount according to product quality requirements. The feeding accuracy is achieved by controlling the number of times, and the last feeding amount can be adjusted to prevent excessive addition of powder from affecting the accuracy of the final product.

[0064] ② An elastic sleeve in contact with the groove section of the feed roller is provided at the end of the feed pipe to block the tiny gap between the feed pipe and the feed roller, thereby preventing the powder from falling from the gap and causing feeding errors;

[0065] ③ By providing a protective cover with a smooth inner wall outside the feeding roller and a sealing ring between the groove section and the adjacent section of the feeding roller, losses during the feeding process can be further avoided;

[0066] ④ By setting a compensation unit between the feeding unit and the discharge pipe, the powder adhering to the inner wall of the arc groove of the feeding roller is compensated and conveyed and the self-cleaning function is realized. At the same time, the inner wall of the shell of the compensation unit is tilted and smoothed to prevent the powder from adhering to the inner wall of the shell, thereby further improving the feeding accuracy;

[0067] ⑤Through the optimization of the blade structure and the selection of materials, the blade is not only smooth and non-sticky, but also has the function of double scraping off the powder adhered to the inner wall of the arc groove of the feed roller, further ensuring the high-precision feeding effect in compensation transportation;

[0068] In summary, the present invention minimizes the loss of powder and the influence of the feeding process on the powder through multiple controls, so as to ensure the feeding accuracy and the quality accuracy of the powder.

[0069] 2. The present invention realizes short-distance and convenient quantitative powder transportation by turning over the feeding roller. The whole process relies on the gravity of the powder itself without using too many other mechanisms to assist. Therefore, this feeding method not only shortens the feeding distance and realizes efficient feeding, but also saves processing costs and equipment installation space, reduces the contact opportunities between powder and other parts, avoids more powder adhesion, and does not generate large vibration and noise, avoiding affecting the health of operators.

[0070] 3. The present invention can reduce the loss of powder during transportation and improve the powder utilization rate and feeding accuracy by protecting the powder through the sealing ring and protective sleeve inside the feed roller and the self-cleaning compensation effect of the scraper impeller on the powder adhered to the inner wall of the feed roller groove.

[0071] 4. The present invention utilizes the feedback effect of the control unit on the entire mechanical structure to adjust the feeding parameters in real time according to the working conditions, aiming to improve the accuracy of the entire mold quantitative feeding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0073] Figure 2 for Figure 1 Middle AA section view;

[0074] Figure 3 The schematic diagram of the structure of the compensation unit and the feeding unit in the device of the present invention is shown in FIG. Figure 1 ;

[0075] Figure 4 The schematic diagram of the structure of the compensation unit and the feeding unit in the device of the present invention is shown in FIG. Figure 2 ;

[0076] Figure 5 It is a structural schematic diagram of the feeding unit in the device of the present invention;

[0077] Figure 6 for Figure 5 Middle BB section view;

[0078] Figure 7 It is a schematic diagram of the structure of the compensation unit in the device of the present invention without the outer shell;

[0079] Figure 8 It is the principle diagram of the control unit in the device of the present invention;

[0080] Fig. 9 This is a working principle diagram of the hydraulic system of the worm connecting the column in the device of the present invention;

[0081] The accompanying drawings are marked as follows:

[0082] 1-storage barrel, 2-valve assembly, 3-feeding pipe, 4-support platform, 401-upper support platform, 402-lower support platform, 403-installation through hole, 5-feeding unit, 501-tail connection protection sleeve, 502-sealing ring, 503-strain torque sensor, 504-feeding roller protection sleeve, 505-feeding roller, 506-feeding roller drive motor, 507-feeding roller groove section, 508-sealing protection section, 509-elastic bushing, 510-arc groove, 6-compensation unit, 601-connecting rod II, 602-connecting Rod I, 603-connecting rod drive motor, 604-connecting rod drive motor connecting column, 605-worm gear, 606-worm drive motor, 607-worm drive motor connecting column, 608-support seat, 609-housing, 610-worm, 611-worm drive motor auxiliary connecting column, 612-hydraulic assembly, 613-scraper impeller, 6131-blade, 6132-connecting rod, 6133-connecting sleeve, 6134-accommodating groove, 614-scraper impeller connecting shaft, 7-feeding unit connecting column, 8-discharge pipe. DETAILED DESCRIPTION

[0083] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0084] like Figure 1-Figure 9 The carbon fiber multifunctional friction material self-cleaning precision filling device includes a supporting platform, a material storage unit, a material feeding unit, a compensation unit and a control unit.

[0085] The supporting platform includes an upper supporting platform and a lower supporting platform stacked up and down; a first mounting through hole is opened in the middle of the table top of the upper supporting platform, and a second mounting through hole is opened in the middle of the table top of the lower supporting platform, and the two mounting through holes are coaxially arranged; wherein, the upper supporting platform provides support for the material storage unit, and the lower supporting platform provides support for the material feeding unit and the compensation unit, and the upper supporting platform and the lower supporting platform cooperate to connect the three parts of the material storage unit, the material feeding unit and the compensation unit into a compact whole.

[0086] The storage unit plays a role of temporary storage and buffering for the powder, preventing the filling speed from being too fast and making it difficult to control the accuracy. It includes a storage barrel and a valve assembly; a powder inlet is set at the top of the storage barrel (the powder is added to the storage barrel through the previous mixing process), a powder outlet and four support columns are set at the bottom, and the entire storage barrel is installed on the upper support platform through the four support columns. The storage barrel conveys powder to the feeding unit located on the lower support platform through the feed pipe; the valve assembly is installed on the feed pipe to control the on and off of the feeding, and it includes a plug valve and a valve drive motor (when the filling starts, the plug valve opens to make the entire flow channel pass through, and the powder falls from the valve body to the feeding unit. When the powder feeding process is completed, the plug valve is closed; in addition, the rotation angle of the plug valve body can be adjusted by the valve drive motor, so that the overlapping area of ​​the valve body through hole and the feed pipe cross section changes, thereby changing the flow area of ​​the powder and realizing the control of the powder flow rate). The feed pipe is installed at the first installation through hole, and its inlet is sealed and connected to the powder outlet of the storage unit.

[0087] The feeding unit is installed on the lower support platform through the feeding unit connecting column, and mainly performs quantitative conveying of powder materials. It includes a feeding roller, a feeding roller driving motor, a protective sleeve and a sealing ring. The feeding roller includes a tail section, a first sealing protection section, a feeding groove section, a second sealing protection section and a driving connection section connected in sequence along the axial direction, and a sealing groove is provided at the connection of each section, wherein the first sealing protection section and the second sealing protection section are separated on both sides of the feeding groove section, and both can be referred to as sealing protection sections; the feeding roller is sleeved in the protective sleeve; the sealing ring is provided in the sealing groove and is fixedly connected to the protective sleeve. The feeding roller groove section is provided with two arc grooves for containing powder materials along the circumferential direction; there is a spacing between the two arc grooves, and the spacing corresponds to a central angle of 30°, and each arc groove corresponds to a central angle of 45°; the feeding roller driving motor is connected to the driving connection section, and drives the feeding roller to rotate relative to the protective sleeve and the sealing ring, so that the powder materials fall from the arc grooves under the action of gravity. The protective cover includes a feed roller protective cover and a tail connection protective cover, which are arranged in a split manner for easy disassembly and assembly; wherein, the feed roller protective cover is symmetrically provided with two openings at the top and bottom of the feed roller groove section, and each opening can expose two arc grooves at the same time; the feed pipe is adapted to extend into the top opening of the protective cover, and an elastic shaft sleeve is provided at its end to contact the feed roller groove section.

[0088] The working principle of the feeding unit in the above self-cleaning precision filling device is as follows: open the valve assembly of the storage unit, and the powder flows from the storage barrel to the arc groove of the feeding roller; under the driving action of the feeding roller driving motor, the feeding roller rotates 180° in the protective sleeve with the powder, and at this time, the arc groove of the feeding roller is just aligned with the discharge pipe. Under the action of gravity, the powder falls directly from the arc groove to the discharge pipe to realize the transportation of the powder. By setting a sealing ring in the feeding roller, the loss caused by leakage during the transportation process can be reduced; in addition, a protective sleeve is set outside the feeding roller to isolate the outside air, which can prevent impurities from mixing into the powder and causing powder contamination; an elastic sleeve in contact with the feeding roller is set on the end face of the protective sleeve where the feed pipe extends into the feeding unit, which not only plays an auxiliary connection role, but also can further prevent the powder from falling into the protective sleeve through the gap between the feed pipe and the feeding roller during transportation, thereby causing blockage and reduced feeding accuracy.

[0089] The function of the compensation unit is to compensate and convey a small amount of powder adhering to the inner wall of the circular arc groove of the feed roller, reduce the loss during transportation, and thus improve the feeding accuracy. It includes a shell and two sets of compensation cleaning mechanisms. The shell is located between the lower support platform and the feed unit, and its top is adapted to the bottom of the protective cover, and the top is provided with a through hole that docks with the bottom opening of the protective cover, and the bottom is provided with a discharge pipe passing through the lower support platform, and the discharge pipe is installed at the second installation through hole. The two sets of compensation cleaning mechanisms are symmetrically arranged at both ends of the shell, and are respectively used to scrape off the powder adhering to the inner walls of the two circular arc grooves of the feed roller. Each set of compensation cleaning mechanisms includes a scraper assembly, a connecting rod assembly, a worm gear assembly, and a hydraulic assembly. The scraper assembly is located in the shell, including a scraper impeller and a scraper impeller connecting shaft; the scraper impeller is coaxially installed on the scraper impeller connecting shaft, and takes the scraper impeller connecting shaft as the rotation axis, and its rotation radius is equal to the radius of the arc surface of the arc groove, so that the scraper impeller can clean and rub the inner wall of the arc groove during the subsequent compensation conveying process to achieve better compensation conveying effect of the powder; the connecting rod assembly and the worm gear assembly are respectively arranged on both sides of the shell; the connecting rod assembly is connected to one end of the scraper impeller connecting shaft, and is used to control the horizontal movement of the scraper assembly in the shell, driving it away from or close to the arc groove of the feed roller. When the scraper impeller connecting shaft is When the connecting rod assembly is driven to a position close to the arc groove of the feed roller, the scraper impeller is coaxial with the arc groove of the feed roller; the worm gear assembly is connected to the other end of the scraper impeller connecting shaft, and is used to control the scraper assembly to rotate in the outer shell, and drive it to scrape off the powder adhered to the inner wall of the arc groove of the feed roller; the scraper impeller connecting shaft can rotate driven by the worm gear, and when it rotates to the point where the scraper impeller faces downward, the powder scraped from the arc groove by the scraper impeller will fall to the discharge port under the action of the rotating centrifugal force and gravity, thereby ensuring high-precision feeding; the hydraulic assembly is used to realize the meshing and separation of the worm wheel and the worm in the worm gear assembly.

[0090] Specifically, the outer shell is a rectangular parallelepiped with an inlet on the top and an outlet on the bottom; the inlet is seamlessly connected to the bottom opening of the protective cover, the outlet is seamlessly connected to the discharge pipe, and the outlet size is slightly larger than the inlet size based on the subsequent process flow; two groups of guide grooves are symmetrically arranged on the two opposite sides of the outer shell; the two groups of guide grooves are respectively used to install two groups of scraper impeller connecting shafts of the compensating cleaning mechanism; the two guide grooves on the same side are located in the same horizontal plane, and the lengths of the two guide grooves are sufficient to ensure that when the scraper impeller connecting shaft moves to the inner limit position of the guide groove under the drive of the connecting rod assembly (that is, when the scraper impeller is close to the arc groove of the feed roller), the scraper impeller connecting shaft is coaxial with the groove surface of the arc groove, and the two scraper impellers do not interfere with each other when rotating; the inner walls of the other two opposite sides of the outer shell are inclined from top to bottom toward the outlet to form an inclined surface, and the two inclined surfaces do not interfere with the rotation of the two scraper impellers. The scraping impeller includes blades, connecting rods and connecting sleeves; the blades are connected to the connecting sleeves through the connecting rods; the curvature of the blade surface is the same as the curvature of the arc groove, and a receiving groove is provided on the surface, and inclined surfaces are provided at both ends of the surface, which is convenient for the first scraping of powder, and the powder scraped out for the first time will automatically fall down; the scraping impeller connecting shaft is installed in the connecting sleeve, and both ends thereof extend out of the connecting sleeve; wherein, the blades are made of smooth and non-adhesive material, the four groove walls of the receiving groove are all set as inclined surfaces, and among the two groove edges arranged in sequence on the surface of the receiving groove along the scraping direction, the groove edge located on the rear side of the scraping direction is slightly higher than the groove edge located on the front side of the scraping direction, so that the inner wall of the arc groove can be cleaned again by using the higher groove edge, and the powder scraped for the second time can fall into the receiving groove just right, so as to better contain the powder.

[0091] The connecting rod assembly includes connecting rod I, connecting rod II, connecting rod driving motor and connecting rod driving motor connecting column; the connecting rod driving motor is installed on the lower support platform through the connecting rod driving motor connecting column, and its output is connected to one end of connecting rod I, the other end of connecting rod I is hinged to one end of connecting rod II, and the other end of connecting rod II is coaxially connected to a section of the scraper impeller connecting shaft through a bearing. The worm gear assembly includes a worm wheel, a worm driving motor, a worm driving motor connecting column, a support seat, a worm, and a worm driving motor auxiliary connecting column; the worm driving motor is installed on the lower support platform through the worm driving motor connecting column, and its output is connected to one end of the worm, and the middle part of the worm is sleeved in the support seat installed on the lower support platform through the worm driving motor auxiliary connecting column; the worm wheel is coaxially installed at the other end of the scraper impeller connecting shaft. The hydraulic assembly synchronously lifts the worm driving motor connecting column and the worm driving motor auxiliary connecting column to achieve the engagement and separation of the other end of the worm and the worm wheel.

[0092] The working principle of the compensation unit in the above-mentioned self-cleaning precision filling device is: first, the connecting rod I is driven to rotate by the connecting rod driving motor, one end of the connecting rod II is hinged with the connecting rod I, and the other end is coaxially connected to the scraper impeller connecting shaft, and the scraper impeller connecting shaft is coaxially connected to the scraper impeller, so that the two scraper impellers can be horizontally moved to the middle in the guide groove of the shell along with the scraper impeller connecting shaft by using the transmission principle of the "crank-slider" mechanism. When moving to the limit position on the inner side of the guide groove, the blades of the scraper impeller just fit with the inner wall of the arc groove of the feed roller; secondly, the worm drive motor connecting column and the worm drive motor auxiliary connecting column as the actuator are raised by the synchronous circuit hydraulic component, at this time, the worm is meshed with the worm wheel; at the same time, the worm and the worm wheel are driven to rotate by the worm drive motor, because the worm wheel is coaxially connected to the scraper impeller through the scraper impeller connecting shaft, so that the scraper impeller is further rotated and works by using the transmission principle of the "worm wheel-worm" mechanism. Among them, both ends of the blades of the scraper impeller are set as inclined surfaces. During the rotation process, the friction between the inclined surface and the inner wall of the arc groove can improve the material removal effect. Then, with the help of the centrifugal force of the impeller during high-speed rotation, the adhering powder is thrown off and dropped into the discharge pipe. When the work is finished, the scraper impeller stops rotating by turning off the worm drive motor; then, the worm drive motor connecting column and the worm drive motor auxiliary connecting column are lowered with the help of the hydraulic assembly; finally, the connecting rod drive motor rotates in the opposite direction to make the scraper impeller move horizontally to the outside along the scraper impeller connecting shaft. During operation, the speed of the scraper impeller can be controlled by the speed of the worm drive motor. In addition, the connecting rod drive motor and the worm drive motor are both subject to feedback from the upper computer and will adjust the motor parameters according to the actual working conditions.

[0093] The roughness of the inner wall of the protective sleeve and the inner wall of the outer shell is not higher than 0.4 μm to ensure that they are smooth enough so that the powder will not stick to the inner wall of the protective sleeve and the inner wall of the outer shell during the flipping transportation and the unloading process, thereby reducing the loss during the transportation process.

[0094] The control unit includes a host computer, a strain type torque sensor and a data processing module; the strain type torque sensor is arranged at the tail end of the feed roller to measure the rotation torque of the feed roller drive motor. When the feed roller rotates, the strain type torque sensor, the protective sleeve and the sealing ring do not rotate with it and remain fixed; the strain type torque sensor transmits the torque signal to the data processing module for processing into a powder quality signal, and then feeds it back to the host computer for accumulation; the host computer adjusts the working state of each electrical component in the device according to the feedback signal. Among them, the strain type torque sensor has a negative feedback closed-loop control effect on the entire precision filling device. The working principle is: when the last filling is performed, the host computer sends a feedback signal, which first acts on the drive motor of the valve assembly to reduce the valve opening, thereby slowing down the discharge speed, and then acts on the feed roller drive motor to reduce the speed, so that the filling rate of the powder in the mold in the next process link is gradually reduced. When the feeding progress reaches 100%, the feed roller drive motor stops working, and the valve assembly of the storage unit is completely closed to prevent exceeding the set value of the feeding. The upper computer also controls each drive motor in the compensation unit. After the feeding of a mold is completed, the worm gear no longer rotates, and the scraper impeller controlled by the connecting rod will move away from the arc groove of the feed roller.

[0095] The strain-type torque sensor detects the torque required by the feed roller drive motor to drive the feed roller and the powder to rotate each time, and uses the data processing module to convert the torque signal into a powder quality signal and transmit it to the host computer. The measurement principle is: M = Jα, where α is the angular acceleration, which is a fixed parameter of the feed roller drive motor, and J is the rotational inertia of the feed roller and the powder, which can be obtained by Calculate, where R is the radius of the feed roller, m is the total mass of the feed roller and the powder, so that the mass of the powder filled each time can be obtained. It is worth noting that during each rotation of the feed roller, the driving torque measured by the strain torque sensor includes not only the overturning torque of the feed roller and the powder itself, but also the friction torque to overcome the contact between the elastic sleeve and the feed roller. To ensure accurate calculation, this part of the friction torque should be removed. The friction torque can be calculated in advance. The principle is: T = μFR, where T is the friction torque, μ is the dynamic friction coefficient at the contact between the elastic sleeve and the feed roller, F is the pressure of the elastic sleeve on the feed roller, and R is the radius of the feed roller.

[0096] During each powder filling process, the upper computer will compare the set mass of powder to be added to the mold with the total mass of the accumulated powder, and adjust the parameters of each component in real time according to the feeding conditions until the mold is accurately filled. When preparing to fill the next mold with powder, the feed roller drive motor will continue to drive the feed roller to rotate and feed the material, and the strain torque sensor will monitor the quality of the newly added powder to ensure the accuracy of each filling, and it will reciprocate in sequence until the end.

[0097] The method for accurately feeding the self-cleaning accurate filling device of the carbon fiber multifunctional friction material comprises the following steps:

[0098] 1) According to the product dosage requirements, determine the number of feeding times and the last feeding amount, and set the opening and duration of the valve assembly of the storage unit for each feeding;

[0099] 2) Adding carbon fiber multifunctional friction material powder into the storage barrel of the storage unit;

[0100] 3) According to the setting requirements of step 1), the upper computer controls the valve assembly of the material storage unit to open, and when the amount of powder in the arc groove reaches the set amount of this feeding, the valve assembly is closed;

[0101] 4) The upper computer starts the feed roller driving motor of the feed unit and controls the feed roller to flip 180°. The arc groove faces the bottom opening of the protective cover. The powder falls to the next process link through the shell of the compensation unit and the discharge pipe under the action of gravity. At the same time, the strain torque sensor is used to detect the torque used by the feed roller driving motor to flip the powder. The torque signal is converted into a powder quality signal through the data processing module and fed back to the upper computer for accumulation.

[0102] 5) The upper computer starts the connecting rod drive motors of the two sets of compensation cleaning mechanisms to control the two scraper impeller connecting shafts to move to the inner limit positions of their respective guide grooves;

[0103] 6) The upper computer starts the hydraulic components of the two sets of compensation cleaning mechanisms to synchronously raise the worm drive motor connection column and the worm drive motor auxiliary connection column, so that the worm and the worm wheel are meshed;

[0104] 7) The upper computer starts the worm drive motors of the two sets of compensation cleaning mechanisms, respectively controls the two scraper impeller connecting shafts to drive the scraper impellers to rotate, scrapes off the powder adhered to the inner wall of the arc groove, and rotates the scraper impeller until the accommodating groove faces downward, and uses gravity to make the powder in the accommodating groove fall to the next process link through the discharge pipe; at the same time, the upper computer controls each component to return to the initial state; the initial state is: the valve assembly is closed, the arc groove faces upward and faces the feed pipe, the worm gear is separated, and the scraper assembly is located at the outer limit position of the guide groove away from the arc groove of the feed roller;

[0105] 8) Repeat steps 3)-7) until the last addition is completed.

[0106] Take the friction plate with a processing size of 2.71g as an example (the density of friction material powder is basically 2.0g / cm 3 The carbon fiber multifunctional friction material self-cleaning precise filling device of this embodiment is used. It is expected to flip and feed 5 to 6 times, with 0.48 to 0.5 g of material each time. The feed roller radius is 40 mm, and the maximum volume of each arc groove is 0.2 cm3 The actual volume of each feeding is about 0.25cm 3 The average material transport capacity of each arc groove is 0.125cm 3 Other details of the clearance fit connection between the feed roller and the protective sleeve: Since the feed roller performs relative rotational motion in the protective sleeve, the clearance fit is used to ensure rotation accuracy and stability. The clearance should be small. Taking the feed roller with a radius of 40mm as an example, the basic hole system H8 / f7 fit is preferred during processing and assembly. The size of the protective sleeve can be obtained by referring to the interchangeability technical manual. Feed roller size

[0107] In order to complete the equipment of the friction plate, on the basis of adopting the existing technology in other processes, the above-mentioned carbon fiber multifunctional friction material self-cleaning precision filling device can be used in the equipment to ensure accurate and lossless feeding in the precise feeding link.

[0108] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. Carbon fiber multifunctional friction material self-cleaning precise filling device, characterized by: It includes a supporting platform, a material storage unit, a material feeding unit, a compensation unit and a control unit; The support platform comprises an upper support platform and a lower support platform stacked up and down; The material storage unit is arranged on the upper support platform, and conveys powder material to the material conveying unit located on the lower support platform through the feeding pipe; The feeding unit comprises a feeding roller, a feeding roller driving motor, a protective sleeve and a sealing ring; The feed roller includes a tail section, a first sealing protection section, a feed groove section, a second sealing protection section and a driving connection section which are connected in sequence along the axial direction, and a sealing groove is provided at the connection between each section; the feed roller is sleeved in the protective sleeve; the sealing ring is provided in the sealing groove and is fixedly connected to the protective sleeve; The groove section of the feeding roller is provided with two arc grooves for containing powder along the circumferential direction; a spacing is left between the two arc grooves, and the spacing corresponds to a central angle of 30±5°, and each arc groove corresponds to a central angle of 40±5°; The feed roller driving motor is connected to the driving connection section, and drives the feed roller to rotate relative to the protective sleeve and the sealing ring; The protective sleeve is symmetrically provided with two openings at the top and bottom of the groove section of the feed roller, and each opening can expose the two arc grooves at the same time; the feed pipe is adapted to extend into the top opening of the protective sleeve, and an elastic sleeve is provided at its end to contact the groove section of the feed roller; The compensation unit comprises a housing and two sets of compensation cleaning mechanisms; The shell is located between the lower support platform and the feeding unit, the top of which is adapted to the bottom of the protective cover, and the top is provided with a through hole that docks with the bottom opening of the protective cover, and the bottom is provided with a discharge pipe adapted to pass through the lower support platform; Two sets of compensation cleaning mechanisms are symmetrically arranged at the two ends of the shell, and are used to scrape off the powder adhered to the inner walls of the two arc grooves of the feeding roller respectively; The roughness of the inner wall of the protective sleeve and the inner wall of the outer shell is not higher than 0.4 μm; The control unit includes a host computer, a strain type torque sensor and a data processing module; the strain type torque sensor is arranged at the tail end of the feed roller, and is used to measure the rotation torque of the feed roller drive motor; the strain type torque sensor transmits the torque signal to the data processing module for processing into a powder quality signal, and then feeds it back to the host computer for accumulation; The host computer adjusts the working status of each electrical component in the device according to the feedback signal.

2. The self-cleaning precise filling device for carbon fiber multifunctional friction material according to claim 1 is characterized in that: Each set of compensation cleaning mechanism includes a scraper assembly, a connecting rod assembly, a worm gear assembly and a hydraulic assembly; The scraper assembly is located in the housing and includes a scraper impeller and a scraper impeller connecting shaft; the scraper impeller is coaxially mounted on the scraper impeller connecting shaft and uses the scraper impeller connecting shaft as a rotation axis, and its rotation radius is equal to the radius of the arc surface of the arc groove; The connecting rod assembly and the worm gear assembly are respectively arranged on two sides of the housing; The connecting rod assembly is connected to one end of the scraper impeller connecting shaft and is used to control the scraper assembly to move horizontally in the housing and drive it to move away from or close to the arc groove of the feed roller; The worm gear assembly is connected to the other end of the scraper impeller connecting shaft, and is used to control the scraper assembly to rotate in the housing, and drive it to scrape off the powder adhered to the inner wall of the arc groove of the feed roller; The hydraulic assembly is used to achieve the meshing and separation of the worm wheel and the worm in the worm gear assembly.

3. The self-cleaning precise filling device for carbon fiber multifunctional friction material according to claim 2 is characterized in that: The scraper impeller includes blades, a connecting rod and a connecting sleeve; the blades are connected to the connecting sleeve through the connecting rod; the curvature of the blade surface is the same as the curvature of the arc groove, and an accommodating groove is provided on the surface, and inclined surfaces are provided at both ends of the surface; the scraper impeller connecting shaft is installed in the connecting sleeve, and its two ends extend out of the connecting sleeve.

4. The self-cleaning precise filling device for carbon fiber multifunctional friction material according to any one of claims 1 to 3, characterized in that: The shell is a rectangular parallelepiped, with an inlet on the top and an outlet on the bottom; the inlet is seamlessly connected to the bottom opening of the protective cover, the outlet is seamlessly connected to the discharge pipe, and the size of the outlet is larger than that of the inlet; Two sets of guide grooves are symmetrically arranged on two opposite sides of the housing; the two sets of guide grooves are respectively used to install the scraper impeller connecting shafts of the two sets of compensation cleaning mechanisms; the two guide grooves located on the same side are located on the same horizontal plane, and the lengths of the two guide grooves are such that when the scraper impeller connecting shaft moves to the inner limit position of the guide groove under the drive of the connecting rod assembly, the scraper impeller connecting shaft is coaxial with the groove surface of the arc groove, and the two scraper impellers do not interfere with each other when rotating; The other two opposite side inner walls of the shell are inclined from top to bottom toward the outlet to form inclined surfaces, and the two inclined surfaces do not interfere with the rotation of the two scraping impellers.

5. The self-cleaning precise filling device for carbon fiber multifunctional friction material according to claim 4 is characterized in that: A first mounting through hole is opened in the middle of the table top of the upper support table, and a second mounting through hole is opened in the middle of the table top of the lower support table, and the two mounting through holes are coaxially arranged; wherein the feed pipe is arranged at the first mounting through hole, and the discharge pipe is arranged at the second mounting through hole.

6. The self-cleaning precise filling device for carbon fiber multifunctional friction material according to claim 5, characterized in that: The material storage unit comprises a material storage barrel and a valve assembly; The storage barrel is located on the upper support platform, and a powder inlet is arranged on the top, and a powder outlet and a support column are arranged on the bottom; wherein the powder outlet is sealedly connected to the inlet of the feed pipe; and the valve assembly is installed on the feed pipe; The feeding unit is mounted on the lower support platform via a feeding unit connecting column; The protective cover comprises a feed roller protective cover and a tail connection protective cover.

7. The self-cleaning precise filling device for carbon fiber multifunctional friction material according to claim 6, characterized in that: The connecting rod assembly includes connecting rod I, connecting rod II, a connecting rod driving motor and a connecting rod driving motor connecting column; The connecting rod driving motor is installed on the lower support platform through the connecting rod driving motor connecting column, and its output is connected to one end of the connecting rod I, the other end of the connecting rod I is hinged to one end of the connecting rod II, and the other end of the connecting rod II is coaxially connected to one end of the scraper impeller connecting shaft through a bearing.

8. The self-cleaning precise filling device for carbon fiber multifunctional friction material according to claim 7, characterized in that: The worm gear assembly includes a worm gear, a worm drive motor, a worm drive motor connecting column, a support seat, a worm, and a worm drive motor auxiliary connecting column; The worm drive motor is installed on the lower support platform through the worm drive motor connecting column, and its output is connected to one end of the worm, and the middle part of the worm is sleeved in the support seat installed on the lower support platform through the worm drive motor auxiliary connecting column; The worm gear is coaxially mounted on the other end of the scraper impeller connecting shaft; The hydraulic assembly synchronously lifts the worm drive motor to connect the column and the worm drive motor to assist in connecting the column, thereby achieving the engagement and separation of the other end of the worm and the worm wheel.

9. A method for accurately feeding carbon fiber multifunctional friction material by using the self-cleaning accurate filling device of claim 8, characterized in that: The following steps are involved: 1) According to the product dosage requirements, determine the number of feeding times and the last feeding amount, and set the opening and duration of the valve assembly of the storage unit for each feeding; 2) Adding carbon fiber multifunctional friction material powder into the storage barrel of the storage unit; 3) According to the setting requirements of step 1), the upper computer controls the valve assembly of the material storage unit to open, and when the amount of powder in the arc groove reaches the set amount of this feeding, the valve assembly is closed; 4) The upper computer starts the feeding roller driving motor of the feeding unit, controls the feeding roller to flip 180°, and the arc groove faces the bottom opening of the protective cover. The powder falls to the next process link through the outer shell and the discharge pipe of the compensation unit under the action of gravity; At the same time, a strain-type torque sensor is used to detect the torque used by the feed roller drive motor to flip the powder. The torque signal is converted into a powder quality signal through a data processing module and fed back to the host computer for accumulation. 5) The upper computer starts the connecting rod drive motors of the two sets of compensation cleaning mechanisms to control the two scraper impeller connecting shafts to move to the inner limit positions of their respective guide grooves; 6) The upper computer starts the hydraulic components of the two sets of compensation cleaning mechanisms to synchronously raise the worm drive motor connection column and the worm drive motor auxiliary connection column, so that the worm and the worm wheel are meshed; 7) The upper computer starts the worm drive motors of the two sets of compensation cleaning mechanisms, and controls the two scraper impeller connecting shafts to drive the scraper impellers to rotate, scrape off the powder adhering to the inner wall of the arc groove, and rotate the scraper impellers until the accommodating groove faces downward, and use gravity to make the powder in the accommodating groove fall through the discharge pipe to the next process link; at the same time, the upper computer controls each component to return to the initial state; 8) Repeat steps 3)-7) until the last addition is completed.

10. An apparatus for preparing a friction plate for a high-performance brake system, characterized in that: The self-cleaning precise filling device for carbon fiber multifunctional friction material described in claims 1-8 is used to ensure precise and lossless feeding.

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