A device for detecting braking performance of a drum brake for an automobile

Abstract

This invention discloses a braking performance testing device for automotive drum brakes, belonging to the field of brake testing technology. The device includes a transport mechanism, a positioning and fixing mechanism, a docking mechanism, and a drive testing mechanism. The transport mechanism transports the assembled brake to the testing station; the positioning and fixing mechanism automatically positions and clamps the brake base plate of the brake; the docking mechanism establishes a separable connection with the brake actuator that drives the brake shoes; and the drive testing mechanism rotates the brake drum and collects braking performance parameters. This invention automates the entire process of brake testing, from positioning and fixing to docking and testing, eliminating the need for manual installation of the simulation shaft or drive shaft, improving testing efficiency, and is suitable for assembly line batch testing.

Description

Technical Field

[0001] This application relates to the field of brake testing technology, and in particular to a braking performance testing device for automotive drum brakes. Background Technology

[0002] Drum brakes are an important component of automotive braking systems, and their braking performance directly affects vehicle safety. Before leaving the factory, brake performance must be tested to ensure that the product meets design requirements.

[0003] Currently, traditional brake performance testing devices typically use a simulated half-shaft or drive shaft connected to the splined holes or flanges of the brake drum. The simulated shaft rotates to drive the brake drum, simulating real-vehicle operating conditions for testing. However, this driving method has the following drawbacks: First, the installation of the simulated shaft requires manual operation. Operators must precisely align the simulated shaft with the brake drum and complete the connection, a time-consuming process with low testing efficiency, making it difficult to adapt to the needs of automated production lines. Second, different brake models have different spline specifications and mounting hole positions, requiring the replacement of corresponding adapters during testing, resulting in poor equipment flexibility and high changeover costs. Furthermore, existing testing devices mostly rely on manual loading and unloading and manual clamping of the brake base plate, leading to low automation of the entire testing process, numerous human interference factors, and difficulty in guaranteeing the repeatability and consistency of test results.

[0004] To address the aforementioned issues, there is an urgent need for a testing device that can achieve fully automated testing, eliminates the need for manual installation of the simulated shaft, and is compatible with various types of brakes. Summary of the Invention

[0005] To automate the testing of brakes, this application provides a braking performance testing device for automotive drum brakes, employing the following technical solution: A braking performance testing device for automotive drum brakes, characterized in that it comprises: The conveying mechanism is used to transport the assembled brakes to the testing station; A positioning and fixing mechanism is installed at the testing station to position the brake and automatically clamp and fix its brake base plate. A docking mechanism for establishing a separable connection with a brake actuator that drives the movement of the brake shoes; The drive detection mechanism is used to rotate the brake drum of the brake and collect performance parameters during the braking process.

[0006] Furthermore, the transportation mechanism includes: Two parallel conveyor belts are mounted on the ground via supports. Multiple conveyor trays are arranged horizontally, with each end of the tray fixedly connected to two conveyor belts and distributed at intervals along the conveying direction of the conveyor belts. A loading robot is set at the loading station to place the assembled brake on the upper surface of the conveyor plate and make the brake base plate of the brake abut against the upper surface of the conveyor plate. A material unloading robot, located at the material unloading station, is used to remove the inspected brakes from the conveyor tray.

[0007] Furthermore, the positioning and fixing mechanism includes: Three first positioning blocks are evenly distributed on the support along the circumference of the conveyor plate at the testing station; Three first driving components are mounted on the bracket and are used to drive the corresponding first positioning block to move radially along the conveyor disk, and the distance between the three first positioning blocks and the axis of the conveyor disk is always consistent. The conveyor tray has a circular hole at its center; The first rotary table is located at the inspection station and below the conveyor plate. It is rotatably connected to the support and is coaxially arranged with the conveyor plate located at the inspection station. The mounting plate is coaxially disposed above the first rotating plate and connected to the first rotating plate through a second driving component, which is used to drive the mounting plate to move up and down. Multiple electric three-jaw chucks are evenly distributed around the circumference of the mounting plate. Each electric three-jaw chuck has an insertion rod vertically provided on its jaws, and a first limiting block is provided at the upper end of the insertion rod. The locator, mounted on the mounting plate, is used to detect the position of the threaded holes on the brake base plate and control the rotation of the first rotating plate according to the detection result, so that each of the insertion rods is aligned with the corresponding threaded hole.

[0008] Furthermore, the positioning and fixing mechanism also includes: The second rotating disk has a cavity inside the mounting disk, and the second rotating disk is coaxially rotatably connected to the cavity; the mounting disk has multiple first sliding grooves extending radially into the cavity, and the number of the first sliding grooves is the same as the number of the electric three-jaw chuck; the second rotating disk has multiple arc-shaped second sliding grooves. The first slider is fixedly installed at the bottom of each of the electric three-jaw chucks, and the first slider slides in cooperation with both the first slide groove and the second slide groove.

[0009] Furthermore, the docking mechanism includes: The connector is mounted on the positioning and fixing mechanism via a third driving component, which is used to drive the connector to move axially. The connector is used to connect to an external pressure fluid source and can be docked with the media interface of the brake actuator.

[0010] Furthermore, the docking mechanism also includes: A swing rod, one end of which is elastically rotatably connected to the axis of the mounting plate, and the axis of rotation is coaxial with the axis of the mounting plate; The third driving component is slidably connected to the swing arm along the radial direction of the mounting plate; The fourth driving component is mounted on the swing arm and is used to drive the third driving component to slide along the swing arm.

[0011] Furthermore, the bottom of the conveyor tray is provided with multiple slots on the side wall of the central circular hole; The side wall of the mounting plate is provided with a second locking block; With the insertion rod inserted into the threaded hole of the brake base plate, the second locking block and the locking groove are offset in the axial direction.

[0012] Furthermore, the drive detection mechanism includes: The clamping disc is horizontally positioned above the conveyor belt and coaxially arranged with the mounting disc; Three or more clamping blocks are evenly distributed along the circumference of the clamping disk, and each clamping block is slidably connected to the lower part of the clamping disk along the radial direction of the clamping disk, and the distance between each clamping block and the axis of the clamping disk is always consistent. The fifth driving component, mounted on the bracket, is used to drive the clamping disk to rotate. A torque sensor is mounted on the output shaft of the fifth driving component. The sixth driving member is used to drive the fifth driving member to move in the vertical direction.

[0013] Furthermore, a temperature detector is embedded on the side of the clamping block near the axis of the clamping disk.

[0014] Furthermore, the drive detection mechanism also includes a deformation detection unit, which includes: Multiple detection columns are provided. The bottom of the clamping disk has multiple third sliding grooves along its radial direction. The detection columns are elastically slidably connected to the third sliding grooves and have an elastic tendency to move towards the axis of the clamping disk. One detection column is provided between every two adjacent clamping blocks. The seventh driving component, mounted on the clamping plate, is used to drive the detection column to move along the third sliding groove in a direction away from the axis of the clamping plate; The positive terminal is located at the center of the clamping plate; A conductive plate is installed in the third groove along the length of the third groove, and one end of the conductive plate is electrically connected to the positive terminal. The detection line has one end fixed to the detection post and abutting against the conductive plate, and the other end of the detection line extends to the edge of the clamping disk and is connected to a negative terminal. An ammeter is connected in series on the detection line.

[0015] In summary, the beneficial technical effects of this application are as follows: 1. A braking performance testing device for automotive drum brakes is designed. This application realizes full automation of the brake from transportation, positioning, fixing, docking and testing, which improves testing efficiency and positional accuracy and reduces the uncertainties caused by manual intervention; 2. A braking performance testing device for automotive drum brakes is designed. Through the aforementioned conveying mechanism, the entire process of brake transfer from loading and testing to unloading is automated, reducing manual handling and improving testing efficiency. 3. A braking performance testing device for automotive drum brakes is designed. Through the above-mentioned positioning and fixing mechanism, the device can automatically position and lock brakes with random positions and positional deviations, providing a precise installation benchmark for subsequent testing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a braking performance testing device for automotive drum brakes according to an embodiment of this application; Figure 2 This is a partial structural schematic diagram of a braking performance testing device for automotive drum brakes according to an embodiment of this application; Figure 3 This is a partial structural schematic diagram of a braking performance testing device for an automobile drum brake according to an embodiment of this application, intended to illustrate the positioning and fixing mechanism; Figure 4 This is a partial structural schematic diagram of a braking performance testing device for an automobile drum brake according to an embodiment of this application, intended to show the working state of the first limiting block; Figure 5 This is a schematic diagram of the positioning and fixing mechanism of a braking performance testing device for automotive drum brakes, according to an embodiment of this application. Figure 6 yes Figure 5 Partial sectional view; Figure 7 This is a partial structural schematic diagram of a braking performance testing device for an automobile drum brake according to an embodiment of this application, intended to illustrate the drive testing mechanism; Figure 8 This is a partial structural schematic diagram of a braking performance testing device for automotive drum brakes according to an embodiment of this application, intended to illustrate the structure on the clamping disc.

[0017] Explanation of reference numerals in the attached figures: 01. Brake base plate; 02. Brake drum; 1. Conveying mechanism; 11. Conveyor belt; 12. Conveyor disc; 121. Slot; 13. Loading robot; 14. Unloading robot; 2. Positioning and fixing mechanism; 21. First positioning block; 22. First driving component; 23. First rotating disc; 24. Mounting disc; 241. Second driving component; 242. First slide groove; 243. Second locking block; 25. Electric three-jaw chuck; 251. Insertion rod; 252. First limit block; 26. Positioner; 27. Second rotating disc; 271. Second 28. Slide rail; 3. First slider; 4. Docking mechanism; 5. Third drive component; 6. Connecting joint; 7. Swing rod; 8. Fourth drive component; 9. Drive detection mechanism; 10. Clamping plate; 11. Clamping block; 12. Temperature detector; 13. Fifth drive component; 14. Torque sensor; 15. Sixth drive component; 16. Deformation detection unit; 17. Detection column; 18. Seventh drive component; 19. Positive terminal; 10. Conductive plate; 11. Detection line; 12. Negative terminal; 13. Ammeter. Detailed Implementation

[0018] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] This application discloses a braking performance testing device for automotive drum brakes.

[0020] Reference Figure 1 and Figure 5 This application provides a braking performance testing device for automotive drum brakes, comprising a conveying mechanism 1, a positioning and fixing mechanism 2, a docking mechanism 3, and a driving and testing mechanism 4. The conveying mechanism 1 transports the assembled brake from the loading station to the testing station, and after testing, transports the brake to the unloading station, achieving automated brake flow. The positioning and fixing mechanism 2 is installed at the testing station to position and fix the brake transported there, ensuring the positional accuracy and stability of the brake during subsequent testing. The docking mechanism 3 is installed on the positioning and fixing mechanism 2 to establish a separable connection with the brake actuator that drives the brake shoe. After the brake is fixed, the docking mechanism 3 docks with the brake actuator, providing driving force to the brake shoe. The driving and testing mechanism 4 is located at the testing station. After the docking mechanism 3 completes the connection, the driving and testing mechanism 4 drives the brake drum to rotate and collects performance parameters during the braking process.

[0021] Through the coordinated work of the above components, this application realizes full automation of the brake process from transportation, positioning, fixing, docking to detection, improving detection efficiency and positional accuracy, and reducing uncertainties caused by human intervention.

[0022] Reference Figure 1 The conveying mechanism 1 includes two parallel conveyor belts 11, a conveyor tray 12, a loading robot 13, and a unloading robot 14. The two conveyor belts 11 are mounted on the ground via supports. The conveyor tray 12 is horizontally positioned, with its two ends fixedly connected to the two conveyor belts 11 respectively, and is spaced apart along the conveying direction of the conveyor belts 11. The loading robot 13 is located at the loading station and is used to place the assembled brakes onto the upper surface of the conveyor tray 12, ensuring that the brake base plate of the brake abuts against the upper surface of the conveyor tray 12. The unloading robot 14 is located at the unloading station and is used to remove the inspected brakes from the conveyor tray 12.

[0023] During operation, personnel transport the assembled brakes to the loading station, where the loading robot 13 clamps the brakes and places them on the conveyor plate 12. As the conveyor belt 11 rotates, it moves the conveyor plate 12 and the brakes along with it, transporting the brakes to the inspection station for testing. After inspection, the conveyor belt 11 continues to rotate, transporting the brakes to the unloading station, where the unloading robot 14 removes the brakes from the conveyor plate 12.

[0024] Through the aforementioned transport mechanism 1, the entire process of brake transfer from loading and testing to unloading is automated, reducing manual handling and improving testing efficiency.

[0025] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 Because the position of the bolt holes is random during the transportation of the brake, the orientation of the bolt holes is also uncertain after the brake is placed on the conveyor plate 12. Furthermore, vibrations during transport may cause the brake's position on the conveyor plate 12 to shift. To ensure testing accuracy, the brake needs to be positioned and the brake base plate fixed before testing. The positioning and fixing mechanism 2 includes three first positioning blocks 21, three first driving components 22, a first rotating disk 23, a mounting disk 24, multiple electric three-jaw chucks 25, and a positioner 26. The three first positioning blocks 21 are evenly distributed on the support along the circumference of the conveyor plate 12 at the testing station; the three first driving components 22 are mounted on the support and are used to drive the corresponding first positioning block 21 to move radially along the conveyor plate 12, and the distance between the three first positioning blocks 21 and the axis of the conveyor plate 12 remains consistent. In this embodiment, the first driving component 22 is a cylinder.

[0026] A circular hole is provided at the center of the conveyor plate 12. A first rotating plate 23 is located at the inspection station and below the conveyor plate 12, rotatably connected to the support frame, and coaxially arranged with the conveyor plate 12 at the inspection station. In this embodiment, the first rotating plate 23 is driven to rotate by a motor. A mounting plate 24 is coaxially arranged above the first rotating plate 23 and connected to the first rotating plate 23 via a second driving member 241, which drives the mounting plate 24 to move up and down. In this embodiment, the second driving member 241 is a cylinder.

[0027] Multiple electric three-jaw chucks 25 are evenly distributed around the circumference of the mounting plate 24. Each electric three-jaw chuck 25 has a vertically mounted insertion rod 251 on its jaws, and a first limiting block 252 is provided at the upper end of the insertion rod 251. A positioner 26 is mounted on the mounting plate 24 and is used to detect the position of the threaded hole on the brake base plate. Based on the detection result, it controls the rotation of the first rotating plate 23 to align each insertion rod 251 with the corresponding threaded hole.

[0028] During operation, when the conveyor plate 12 moves to the inspection station, the first drive unit 22 drives the first positioning block 21 to move synchronously, abutting against the outer edge of the brake base plate, keeping the brake base plate concentric with the conveyor plate 12. Subsequently, the positioner 26 starts working, detecting the position of the threaded hole on the brake base plate through the circular hole at the center of the conveyor plate 12. The first rotating plate 23 drives the mounting plate 24 to rotate according to the detection result of the positioner 26, aligning the insertion rods 251 on each electric three-jaw chuck 25 with the corresponding threaded holes. After alignment, the second drive unit 241 drives the mounting plate 24 to move upwards, causing the first limiting block 252 at the upper end of the insertion rod 251 to pass through the circular hole and enter the interior of the brake base plate. Then, the electric three-jaw chuck 25 starts, driving its jaws to move away from each other, causing the insertion rod 251 to move outwards, moving the first limiting block 252 to a position where it can abut against the inner side of the brake base plate. Finally, the second drive component 241 drives the mounting plate 24 to move downward until the first limit block 252 abuts against the inner side of the brake base plate, locking and fixing the brake base plate.

[0029] The aforementioned positioning and fixing mechanism 2 enables automatic positioning and locking of brakes with random positions and positional deviations, providing a precise installation benchmark for subsequent testing.

[0030] Reference Figure 5 and Figure 6 To accommodate more types of brakes (different models of brake base plates have different distances between the threaded holes and the center), the positioning and fixing mechanism 2 also includes a second rotating disk 27 and a first slider 28.

[0031] The mounting plate 24 has a cavity inside, and the second rotating plate 27 is coaxially rotatably connected to the cavity. In this embodiment, the second rotating plate 27 is driven to rotate by a motor. The mounting plate 24 has multiple first sliding grooves 242 extending radially into the cavity, the number of which matches the number of electric three-jaw chucks 25. The second rotating plate 27 has multiple arc-shaped second sliding grooves 271. A first slider 28 is fixedly mounted on the bottom of each electric three-jaw chuck 25, and the first slider 28 simultaneously slides with the first sliding grooves 242 and the second sliding grooves 271.

[0032] During operation, the second rotating disk 27 rotates, and through the cooperation of the second sliding groove 271 and the first sliding groove 242, it drives the first slider 28 to move radially along the mounting disk 24, thereby adjusting the radial position of the electric three-jaw chuck 25 on the mounting disk 24, so that the insertion rod 251 can be adapted to the position of the threaded hole on different brake base plates.

[0033] With the above structure, this application can flexibly adjust the radial position of the electric three-jaw chuck 25 according to the specifications of different brakes, thereby being compatible with the testing requirements of various types of brakes and improving the versatility and flexibility of the testing device.

[0034] Reference Figure 5 The docking mechanism 3 includes a third driving member 31 and a docking connector 32. The third driving member 31 is mounted on the positioning and fixing mechanism 2 and is used to drive the docking connector 32 to move axially. In this embodiment, the third driving member 31 is a cylinder. The docking connector 32 is used to connect to an external pressure fluid source and can dock with the medium interface of the brake actuator.

[0035] This application primarily addresses pneumatic or hydraulic brake actuators. During operation, the third drive component 31 moves the connector 32, causing the connector 32 to quickly engage with the medium interface of the brake actuator, introducing external pressurized fluid into the brake actuator, thereby driving the brake actuator to actuate the brake shoes.

[0036] Through the aforementioned docking mechanism 3, automatic and rapid connection between the testing equipment and the brake actuator medium interface is achieved, avoiding manual insertion and removal of pipelines and improving testing efficiency and connection reliability.

[0037] Reference Figure 5 To accommodate different types of brakes (different brake actuators have different media interface positions), the docking mechanism 3 also includes a swing rod 33 and a fourth drive component 34.

[0038] One end of the swing arm 33 is elastically rotatably connected to the axis of the mounting plate 24, and the axis of rotation is coaxial with the axis of the mounting plate 24. The third driving member 31 is slidably connected to the swing arm 33 along the radial direction of the mounting plate 24. The fourth driving member 34 is mounted on the swing arm 33 and is used to drive the third driving member 31 to slide along the swing arm 33. In this embodiment, the fourth driving member 34 is a cylinder.

[0039] During operation, the first rotating disk 23 drives the mounting disk 24 to rotate, positioning the connector 32 and the media interface of the brake actuator on the same radial direction of the mounting disk 24. Subsequently, the fourth driving member 34 drives the third driving member 31 to slide along the swing rod 33, aligning the connector 32 with the media interface. After alignment, the third driving member 31 drives the connector 32 to move axially, completing the docking with the media interface.

[0040] Since the swing arm 33 and the mounting plate 24 are elastically rotatably connected, during the subsequent rotation of the first rotating plate 23 to adjust the alignment of the electric three-jaw chuck 25 with the threaded hole of the brake base plate, the swing arm 33 can swing elastically with the rotation of the mounting plate 24, keeping the docking state of the connector 32 and the medium interface undisturbed.

[0041] With the above structure, this application can be compatible with media interfaces in different locations and maintain the stability of the docking state during multi-degree-of-freedom adjustment.

[0042] Reference Figure 6 Because the brake drum generates a large torque during the testing process, in order to avoid damage to the drive components that drive the first rotating disk 23, it is necessary to transfer the torque-bearing components to other structures. For this purpose, the bottom of the conveyor disk 12 is provided with multiple slots 121 on the side wall of the central circular hole; the side wall of the mounting disk 24 is provided with a second locking block 243; when the insertion rod 251 is inserted into the threaded hole of the brake base plate, the second locking block 243 is axially offset from the slots 121.

[0043] During operation, after the insertion rod 251 is inserted into the threaded hole of the brake base plate, the second locking block 243 and the locking groove 121 are axially misaligned. Subsequently, the first rotating disk 23 rotates, causing the brake base plate to rotate together until the second locking block 243 and the locking groove 121 are axially aligned. After alignment, the second driving member 241 continues to drive the mounting disk 24 to move upward, causing the second locking block 243 to insert into the locking groove 121, forming a snap-fit ​​engagement.

[0044] With the brake base plate finally fixed, the second locking block 243 remains engaged with the locking slot 121, thereby transmitting the torque generated by the brake drum during the testing process to the bracket through the conveying disc 12, preventing the torque from acting on the driving component that drives the first rotating disc 23, and thus achieving the function of torque unloading.

[0045] With the above structure, the large torque generated during the detection process is transferred to the conveyor plate 12 and the bracket, which effectively protects the driving components of the first rotating plate 23 and improves the reliability and service life of the device.

[0046] Reference Figure 7 and Figure 8 The drive detection mechanism 4 includes a clamping plate 41, three or more clamping blocks 42, a fifth drive component 43, and a sixth drive component 44. The clamping plate 41 is horizontally positioned above the conveyor belt 11 and is coaxially positioned with the mounting plate 24.

[0047] In this embodiment, three clamping blocks 42 are provided, evenly distributed along the circumference of the clamping disk 41. Each clamping block 42 is slidably connected to the lower part of the clamping disk 41 along the radial direction, and the distance between each clamping block 42 and the axis of the clamping disk 41 is always consistent. In this embodiment, the clamping blocks 42 are moved by a cylinder.

[0048] The fifth drive unit 43 is mounted on the bracket and is used to drive the clamping disk 41 to rotate. A torque sensor 431 is mounted on the output shaft of the fifth drive unit 43. In this embodiment, the fifth drive unit 43 is a motor.

[0049] The sixth driving member 44 is used to drive the fifth driving member 43 to move vertically. In this embodiment, the sixth driving member 44 is a cylinder.

[0050] During operation, after the brake base plate is fixed, the sixth drive component 44 drives the clamping disc 41 to move downwards until the clamping block 42 can clamp the outer edge of the brake drum. Subsequently, the cylinder drives the clamping block 42 to move towards the axis of the clamping disc 41, clamping the brake drum. After clamping, the fifth drive component 43 drives the clamping disc 41 to rotate, providing power for brake performance testing. Torque data during the braking process is collected in real time by the torque sensor 431, thereby obtaining performance parameters such as braking time and braking force.

[0051] The aforementioned drive detection mechanism 4 enables automatic clamping and driving of the brake drum, and, in conjunction with the torque sensor 431, completes dynamic detection of braking performance. Compared to existing technologies that require manual installation of a simulated half-shaft or drive shaft to connect to the brake drum, this application employs peripheral clamping drive, eliminating the need for a simulated shaft, thus simplifying the detection process and improving detection efficiency.

[0052] Reference Figure 7 and Figure 8 A temperature detector 421 is embedded on one side of the clamping block 42 near the axis of the clamping disk 41.

[0053] During operation, after the clamping block 42 clamps the outer edge of the brake drum, the temperature detector 421 comes into contact with or approaches the surface of the brake drum, collecting temperature data of the brake drum surface in real time. By monitoring temperature changes during braking, the influence of temperature on performance parameters such as braking torque and braking response time can be analyzed, providing data support for evaluating the thermal fade performance of the brake.

[0054] With the above structure, this application achieves simultaneous monitoring of brake drum temperature while testing braking performance, enabling a more comprehensive evaluation of the brake's performance under different temperature conditions.

[0055] Reference Figure 7 and Figure 8 On the one hand, in order to detect whether the brake drum is deformed during the clamping process, and on the other hand, in order to detect whether the brake drum is deformed during the braking process, the drive detection mechanism 4 also includes a deformation detection unit 45.

[0056] The deformation detection unit 45 includes multiple detection posts 451, a seventh driving element 452, a positive terminal 453, a conductive plate 454, a detection wire 455, a negative terminal 456, and an ammeter 457. The bottom of the clamping disk 41 has multiple third sliding grooves along its radial direction. The detection posts 451 are elastically slidably connected to the third sliding grooves, and the detection posts 451 have an elastic tendency to move towards the axis of the clamping disk 41. A detection post 451 is provided between every two adjacent clamping blocks 42.

[0057] The seventh driving element 452 is mounted on the clamping plate 41 and is used to drive the detection column 451 to move along the third slide groove in a direction away from the axis of the clamping plate 41. In this embodiment, the seventh driving element 452 is a cylinder.

[0058] The positive terminal 453 is located at the center of the clamping plate 41. A conductive plate 454 is installed along the length of the third groove within the third groove, with one end of the conductive plate 454 electrically connected to the positive terminal 453. One end of the detection line 455 is fixed to the detection post 451 and abuts against the conductive plate 454; the other end of the detection line 455 extends to the edge of the clamping plate 41 and is connected to the negative terminal 456. An ammeter 457 is connected in series with the detection line 455.

[0059] During operation, before the clamping block 42 clamps the brake drum, the seventh drive member 452 drives the detection column 451 to move away from the axis along the third slide groove, pulling the detection column 451 away. After the brake drum moves to a position where it can be clamped by the clamping block 42, the seventh drive member 452 releases the detection column 451, which then moves towards the axis due to its own elasticity until it fits against the outer edge of the brake drum. The elasticity of the detection column 451 ensures that it overcomes centrifugal force and maintains contact with the brake drum during the rotation of the clamping disc 41.

[0060] When the brake drum deforms, the detection pin 451 shifts with the unevenness of the brake drum surface, causing the end of the detection line 455 to move along the conductive plate 454. At this time, the length of the conductive plate 454 between the end of the detection line 455 and the positive terminal 453 changes, resulting in a change in the resistance of the circuit, and consequently, a change in the reading of the ammeter 457. By monitoring the change in the ammeter 457, it can be determined whether the brake drum has deformed.

[0061] Through the aforementioned deformation detection unit 45, this application can monitor the deformation of the brake drum in real time during the brake drum clamping process and braking process, providing data support for the evaluation of the structural strength and braking stability of the brake.

[0062] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar words used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "a" or "an," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar words mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0063] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A braking performance testing device for automotive drum brakes, characterized in that, include: The conveying mechanism (1) is used to transport the assembled brake to the testing station; The positioning and fixing mechanism (2) is installed at the testing station and is used to position the brake and automatically clamp and fix its brake base plate. The docking mechanism (3) is used to establish a separable connection with the brake actuator that drives the brake shoe movement; The drive detection mechanism (4) is used to drive the brake drum of the brake to rotate and collect performance parameters during the braking process.

2. The braking performance testing device for automobile drum brakes according to claim 1, characterized in that, The transport mechanism (1) includes: Two parallel conveyor belts (11) are mounted on the ground by a bracket; Multiple conveyor discs (12) are arranged horizontally, with their two ends fixedly connected to two conveyor belts (11) respectively, and are distributed at intervals along the conveying direction of the conveyor belts (11); The loading robot (13) is set at the loading station and is used to place the assembled brake on the upper surface of the conveyor plate (12) and make the brake base plate of the brake abut against the upper surface of the conveyor plate (12). A material unloading robot (14) is set at the material unloading station and is used to remove the brakes that have been inspected from the conveyor plate (12).

3. The braking performance testing device for automobile drum brakes according to claim 2, characterized in that, The positioning and fixing mechanism (2) includes: Three first positioning blocks (21) are evenly distributed on the support along the circumference of the conveyor plate (12) at the detection station; Three first driving components (22) are mounted on the bracket and are used to drive the corresponding first positioning block (21) to move radially along the conveyor disk (12), and the distance between the three first positioning blocks (21) and the axis of the conveyor disk (12) remains consistent. The center of the conveyor plate (12) is provided with a circular hole; The first rotating disk (23) is located at the inspection station and below the conveyor disk (12), and is rotatably connected to the bracket and is coaxially arranged with the conveyor disk (12) located at the inspection station. The mounting plate (24) is coaxially disposed above the first rotating plate (23) and connected to the first rotating plate (23) through the second driving member (241). The second driving member is used to drive the mounting plate (24) to move up and down. Multiple electric three-jaw chucks (25) are evenly distributed around the circumference of the mounting plate (24). Each electric three-jaw chuck (25) has an insertion rod (251) vertically mounted on its jaws. The upper end of the insertion rod (251) is provided with a first limiting block (252). The locator (26) is installed on the mounting plate (24) to detect the position of the threaded hole on the brake base plate and control the first rotating plate (23) to rotate according to the detection result so that each of the insertion rods (251) is aligned with the corresponding threaded hole.

4. The braking performance testing device for automobile drum brakes according to claim 3, characterized in that, The positioning and fixing mechanism (2) further includes: The second rotating disk (27) is coaxially rotatably connected to the cavity inside the mounting disk (24); the mounting disk (24) has a plurality of first sliding grooves (242) extending radially into the cavity, the number of the first sliding grooves (242) being the same as the number of the electric three-jaw chuck (25); the second rotating disk (27) has a plurality of arc-shaped second sliding grooves (271); The first slider (28) is fixedly installed at the bottom of each of the electric three-jaw chucks (25), and the first slider (28) slides in cooperation with the first slide groove (242) and the second slide groove (271).

5. The braking performance testing device for automobile drum brakes according to claim 4, characterized in that, The docking mechanism (3) includes: The connector (32) is mounted on the positioning and fixing mechanism (2) by a third driving member (31), and the third driving member (31) is used to drive the connector (32) to move axially. The connector (32) is used to connect to an external pressure fluid source and can be docked with the media interface of the brake actuator.

6. The braking performance testing device for automobile drum brakes according to claim 5, characterized in that, The docking mechanism (3) also includes: A swing rod (33) is provided, one end of which is elastically rotatably connected to the axis of the mounting plate (24), and the axis of rotation is coaxial with the axis of the mounting plate (24). The third driving member (31) is slidably connected to the swing rod (33) along the radial direction of the mounting plate (24); The fourth driving member (34) is mounted on the swing rod (33) and is used to drive the third driving member (31) to slide along the swing rod (33).

7. A braking performance testing device for automotive drum brakes according to claim 6, characterized in that, The bottom of the conveyor plate (12) is provided with multiple slots (121) on the side wall of the central circular hole; The mounting plate (24) has a second locking block (243) on its side wall; With the insertion rod (251) inserted into the threaded hole of the brake base plate, the second locking block (243) and the locking groove (121) are axially misaligned.

8. The braking performance testing device for automobile drum brakes according to claim 7, characterized in that, The drive detection mechanism (4) includes: The clamping plate (41) is horizontally positioned above the conveyor belt (11) and is coaxially positioned with the mounting plate (24); Three or more clamping blocks (42) are evenly distributed along the circumference of the clamping disk (41). Each clamping block (42) is slidably connected to the lower part of the clamping disk (41) along the radial direction of the clamping disk (41), and the distance between each clamping block (42) and the axis of the clamping disk (41) is always consistent. The fifth drive unit (43) is mounted on the bracket and is used to drive the clamping disk (41) to rotate. A torque sensor (431) is mounted on the output shaft of the fifth drive unit (43). The sixth driving member (44) is used to drive the fifth driving member (43) to move in the vertical direction.

9. A braking performance testing device for automotive drum brakes according to claim 8, characterized in that, A temperature detector (421) is embedded on the side of the clamping block (42) near the axis of the clamping disk (41).

10. A braking performance testing device for automotive drum brakes according to claim 9, characterized in that, The drive detection mechanism (4) further includes a deformation detection unit (45), which includes: Multiple detection posts (451) are provided. Multiple third sliding grooves are provided on the bottom of the clamping disk (41) along its radial direction. The detection posts (451) are elastically slidably connected to the third sliding grooves, and the detection posts (451) have an elastic tendency to move toward the axis of the clamping disk (41). A detection post (451) is provided between every two adjacent clamping blocks (42). The seventh driving component (452) is mounted on the clamping plate (41) and is used to drive the detection column (451) to move along the third slide groove in a direction away from the axis of the clamping plate (41); The positive terminal (453) is located at the center of the clamping plate (41); A conductive plate (454) is installed in the third groove along the length of the third groove, and one end of the conductive plate (454) is electrically connected to the positive terminal (453). The detection line (455) has one end fixed to the detection post (451) and abuts against the conductive plate (454), and the other end of the detection line (455) extends to the edge of the clamping plate (41) and is connected to the negative terminal (456). An ammeter (457) is connected in series with the detection line (455).

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