A hydraulic drum brake testing device

Abstract

This invention discloses a hydraulic drum brake testing device, belonging to the field of drum brake testing technology. It includes a worktable with an airtight fixture for fixing the brake to be tested. A locking part is located beside the airtight fixture. In the testing state, the locking part locks the brake to be tested onto the airtight fixture. A testing part is located on the upper part of the worktable, locking the brake in place via the airtight fixture. The testing end of the testing part moves from top to bottom to the top of the brake and engages with it. A sensing part is also located on the worktable, working in conjunction with the testing part and the locking part. All three are electrically connected and perform synchronous testing. The entire operation is automated through the sensing part, reducing errors caused by manual testing, alleviating worker workload, ensuring traceability of test data, and achieving a 100% testing rate.

Description

Technical Field

[0001] This invention relates to the field of drum brake testing technology, and more particularly to a hydraulic drum brake testing device. Background Technology

[0002] Drum brakes utilize a brake transmission mechanism to press the brake shoes against the brake friction pads inside the brake drum, thereby generating braking force. This allows the wheels to slow down or stop within the shortest distance as needed, ensuring driving safety and preventing the car from sliding automatically when parked.

[0003] The outer diameter inspection of hydraulic drum brakes is a crucial step in ensuring their quality and performance. Traditionally, this inspection is conducted manually using specialized tools, such as a drum brake assembly outer arc dimension inspection tool. This tool includes components like a base plate, guide post, support block, spindle, expansion sleeve, and height dial indicator. By horizontally rotating the brake assembly, the height dial indicator's pointer fluctuation is observed to ensure it remains within 0.2mm, and the perpendicularity of the brake assembly's outer arc meets the 0.2mm requirement, thus determining product qualification. However, this process is susceptible to errors due to manual operation, leading to a lower pass rate and impacting product reliability. Therefore, an automated inspection device is urgently needed. Summary of the Invention

[0004] This invention provides a hydraulic drum brake testing device to solve the aforementioned technical problems.

[0005] The present invention adopts the following technical solution: a hydraulic drum brake testing device, including a worktable, an airtight fixture for fixing the brake to be tested on the worktable, a locking part on the side of the airtight fixture, the locking part locking the brake to be tested onto the airtight fixture in the testing state, a testing part located on the upper part of the worktable, the brake is locked by the airtight fixture, the testing end on the testing part moves from top to bottom to the top of the brake and engages with it, and a sensing part is set on the worktable to work in conjunction with the testing part and the locking part, and all three are electrically connected.

[0006] Furthermore, the airtight fixture includes a fixture plate, a positioning frustum, a sliding guide rail, and a linear cylinder. The sliding guide rail is located in the middle of the worktable, the fixture plate is mounted on the sliding guide rail, the positioning frustum is located on the fixture plate, and the linear cylinder is mounted at the bottom of the fixture plate with its air inlet pointing vertically upward.

[0007] Furthermore, the locking part includes two horizontal fixing members, which are symmetrically arranged on both sides of the positioning truncated cone. In the working state, the two horizontal fixing members abut against the circumferential wall of the brake to be tested.

[0008] Furthermore, the two horizontal fixing components have the same structure, each including a fixed base, a push cylinder, a central positioning V-block, and a guide rail. The fixed base is installed on the worktable, and the push cylinder and guide rail are both installed on the fixed base. The central positioning V-block is installed on the output end of the push cylinder and slides in cooperation with the guide rail.

[0009] Furthermore, the detection unit includes a positioning mounting frame, which is fixed to the upper part of the worktable. A guide cylinder is fixedly installed on the positioning mounting frame. The output direction of the guide cylinder is vertically downward and towards the position of the positioning frustum. A concentricity detection ring gauge is provided on the output shaft of the guide cylinder, and a central guide sleeve is provided at the bottom of the concentricity detection ring gauge to cooperate with the brake to be tested.

[0010] Furthermore, the detection unit also includes a positioning seat and a lever cylinder. The positioning seat is fixedly installed on the workbench, and the lever cylinder is installed on the top of the positioning seat, with the output end of the lever cylinder facing the brake to be detected.

[0011] Furthermore, the sensing unit includes an electrical control box and a limit switch, which is mounted on the workbench and located beside the guide rail.

[0012] Furthermore, the sensing unit also includes switch one, switch two, and an alarm light. Switch one and switch two are located on the sides of two fixed bases and are mounted on the workbench. The limit switches, switch one, switch two, and alarm light are all electrically connected to the electrical control box.

[0013] Furthermore, the workbench is also equipped with lighting.

[0014] Furthermore, the electrical control box is mounted on the workbench, and an LCD screen is provided on the side of the electrical control box.

[0015] The above-described at least one technical solution adopted in the embodiments of the present invention can achieve the following beneficial effects:

[0016] During testing, the brake is placed on the airtight fixture, which is then pushed to the testing area. The locking mechanism locks the brake in place, and the testing unit performs the test simultaneously. The entire operation is automated through the sensor unit, reducing errors caused by manual testing, alleviating the labor intensity of workers, ensuring the traceability of test data, and achieving a 100% testing rate. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1This is a first-view three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a second-view three-dimensional structural diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the third-view three-dimensional structure of the present invention;

[0021] Figure 4 This is a first-view three-dimensional structural diagram of the airtight tooling in this invention;

[0022] Figure 5 This is a second-view three-dimensional structural diagram of the airtight tooling in this invention;

[0023] Figure 6 This is a three-dimensional structural diagram of a single horizontal fixing component in this invention;

[0024] Figure 7 This is a partial three-dimensional structural diagram of the present invention.

[0025] Figure Labels

[0026] Workbench 1, airtight fixture 2, fixture plate 21, positioning frustum 22, sliding guide rail 23, linear cylinder 24, locking part 3, horizontal fixing part 31, fixing seat 311, pushing cylinder 312, center positioning V-block 313, guide rail 314, brake to be tested 4, testing part 5, positioning mounting bracket 51, guide cylinder 52, concentricity testing ring gauge 53, center guide sleeve 54, positioning seat 55, lever cylinder 56, sensing part 6, switch one 61, switch two 62, lighting lamp 63, alarm lamp 7. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] The following is in conjunction with the appendix Figure 1-7 The technical solutions provided in the various embodiments of the present invention will be described in detail.

[0029] This invention provides a hydraulic drum brake testing device, including a worktable 1, an airtight fixture 2 for fixing a brake 4 to be tested on the worktable 1, a locking part 3 on the side of the airtight fixture 2, and in the testing state, the locking part 3 locks the brake 4 to be tested onto the airtight fixture 2. A testing part 5 is located on the upper part of the worktable 1, which locks the brake through the airtight fixture 2. The testing end on the testing part 5 moves from top to bottom to the top of the brake and engages with it. A sensing part 6 is set on the worktable 1 to work with the testing part 5 and the locking part 3. All three are electrically connected. Since the outer circle testing of the drum brake is an important testing link to ensure quality and performance, its necessity cannot be underestimated. In the testing process, the drum brake to be tested (hereinafter referred to as the brake) must first be placed on the airtight fixture 2. Since the airtight fixture 2 has a positioning frustum 22, the central part of the brake is clamped on the positioning frustum 22, which plays a preliminary positioning role.

[0030] After placement, push the airtight fixture 2 to the detection position, which is directly below the detection unit 5. After pushing it to this position, the limit switch on the sensor unit 6 confirms that the brake is in the detection position. At the same time, activate switch one 61 and switch two 62. At this time, the two push cylinders 312 on the locking unit 3 move forward to their positions, causing the center positioning V-block 313 on the push cylinder 312 to abut against the circumferential wall of the brake.

[0031] At the same time, the guide cylinder 52 starts to work. The guide cylinder 52 is equipped with a stroke sensor. When the guide cylinder 52 drives the concentricity detection ring gauge 53 and the center guide sleeve 54 to descend to the designated position, the control box of the sensing unit 6 contains a controller, which is equipped with a PLC. This controller is the control program for the whole system. This control program is existing technology and is not protected by this application. Therefore, this application will not describe the program content in detail. If the program is OK when the designated position is reached, the green light on the alarm light will be displayed, and the air tightness test will continue. If the designated position is not reached, the yellow light will be displayed and the test will be stopped. After the workpiece is removed, press the reset button.

[0032] Once it is determined that the designated position has been reached without error, the air tightness test begins. The air tightness test sequence is low pressure - high pressure - high pressure then low pressure - low pressure then high pressure. The air tightness test is completed through this test process. After the test is completed, the guide cylinder 52 rises back to the initial position.

[0033] Two push cylinders 312 remain in working condition, locking the brake. At this time, lever cylinder 56 presses down to clamp the brake slave pump. Linear cylinder 24 seals the brake slave pump inlet with the sealing gasket and then starts air intake. The operation procedure is to intake air for 3 seconds, hold pressure for 5 seconds, and check the pressure value, with adjustable upper and lower limits allowed. The result is judged to meet the product's qualified value. If qualified, the green light is displayed as OK; if unqualified, the red light is displayed as NG. At this time, the inspection operation is completed. The two push cylinders 312 simultaneously retract to the initial position, the fixture is pulled out, and pressing the start button after leaving the limit switch has no effect. The workpiece is removed to complete the inspection operation. This set of inspection equipment can reduce the errors caused by manual inspection, reduce the labor intensity of workers, ensure the traceability of inspection data, and achieve a 100% inspection rate.

[0034] Preferably, the airtight fixture 2 includes a fixture plate 21, a positioning frustum 22, a sliding guide rail 23, and a linear cylinder 24. The sliding guide rail 23 is located in the middle of the worktable 1, and the fixture plate 21 is mounted on the sliding guide rail 23. The positioning frustum 22 is located on the fixture plate 21, and the linear cylinder 24 is mounted at the bottom of the fixture plate 21 with its air inlet pointing vertically upward. The fixture plate 21 and the positioning frustum 22 are designed to ensure the stable placement of the brake, and the symmetrical arrangement of the two linear cylinders 24 ensures stability during the locking process.

[0035] Preferably, the locking part 3 includes two horizontal fixing members 31, which are symmetrically arranged on both sides of the positioning truncated cone 22. In the working state, the two horizontal fixing members 31 abut against the circumferential wall of the brake 4 to be tested. The double-sided locking ensures the stability of the operation and the reliability of the test data.

[0036] Preferably, the two horizontal fixing members 31 have the same structure, each including a fixing seat 311, a pushing cylinder 312, a center positioning V-block 313, and a guide rail 314. The fixing seat 311 is installed on the worktable 1. The pushing cylinder 312 and the guide rail 314 are both installed on the fixing seat 311. The center positioning V-block 313 is installed on the output end of the pushing cylinder 312 and slides with the guide rail 314. In the locked state, the pushing cylinder 312 drives the center positioning V-block 313 to slide on the guide rail 314 until it moves to the circumferential wall of the brake for locking. This locking mechanism ensures the stability of the detection process.

[0037] Preferably, the detection unit 5 includes a positioning mounting frame 51, which is fixed to the upper part of the workbench 1. A guide cylinder 52 is fixedly mounted on the positioning mounting frame 51. The output direction of the guide cylinder 52 is vertically downward and towards the position of the positioning frustum 22. A concentricity detection ring gauge 53 is provided on the output shaft of the guide cylinder 52, and a central guide sleeve 54 is provided at the bottom of the concentricity detection ring gauge 53 to cooperate with the brake 4 to be tested. By driving the concentricity detection ring gauge 53 and the central guide sleeve 54 to move to the top of the brake through the guide cylinder 52, the preliminary action of the airtightness detection operation can be completed to ensure the smoothness of subsequent detection operations.

[0038] Preferably, the detection unit 5 further includes a positioning seat 55 and a lever cylinder 56. The positioning seat 55 is fixedly installed on the workbench 1, and the lever cylinder 56 is installed on the top of the positioning seat 55. The output end of the lever cylinder 56 is set towards the brake to be tested. The pressing of the brake's slave pump by the lever cylinder 56 ensures the subsequent detection operation, so as to ensure the reliability and stability of the detection data.

[0039] Preferably, the sensing unit 6 includes an electrical control box and a limit switch. The limit switch is set on the workbench 1 and located next to the guide rail 314. When the airtight fixture 2 is pushed to the detection position, that is, directly below the detection unit 5, the limit switch on the sensing unit 6 confirms that the brake is in the detection position at this time. When the fixture is pulled out and leaves the limit switch, pressing the start button will have no effect, thus providing safety protection during the working process.

[0040] Preferably, the sensing unit 6 further includes a first switch 61, a second switch 62, and an alarm light. The first switch 61 and the second switch 62 are located on the sides of the two fixed bases 311 and are mounted on the workbench 1. The limit switches, the first switch 61, the second switch 62, and the lighting 63 are all electrically connected to the electrical control box. Automatic detection is completed through the cooperation of all the above components.

[0041] Preferably, the workbench 1 is also equipped with an alarm light 7 to ensure a clear field of vision during operation.

[0042] Preferably, the electrical control box is installed on the workbench 1, and an LCD screen is provided on the side of the electrical control box, which makes the equipment standardized and rationalized when used together.

[0043] The above are merely embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A hydraulic drum brake testing device, characterized in that, The device includes a workbench (1), an airtight fixture (2) for fixing the brake (4) to be tested on the workbench (1), a locking part (3) on the side of the airtight fixture (2), and in the testing state, the locking part (3) locks the brake (4) to be tested onto the airtight fixture (2). A detection part (5) is located on the upper part of the workbench (1), which locks the brake (4) to be tested through the airtight fixture (2). The detection end on the detection part (5) moves from top to bottom to the top of the brake (4) to be tested and engages with it. A sensing part (6) is set on the workbench (1) to work in conjunction with the detection part (5) and the locking part (3), and all three are electrically connected.

2. The hydraulic drum brake testing device according to claim 1, characterized in that, The airtight fixture (2) includes a fixture plate (21), a positioning frustum (22), a sliding guide rail (23), and a linear cylinder (24). The sliding guide rail (23) is located in the middle of the workbench (1). The fixture plate (21) is mounted on the sliding guide rail (23). The positioning frustum (22) is located on the fixture plate (21). The linear cylinder (24) is mounted on the bottom of the fixture plate (21) with its air inlet pointing vertically upward.

3. The hydraulic drum brake testing device according to claim 1, characterized in that, The locking part (3) includes two horizontal fixing parts (31), which are symmetrically arranged on both sides of the positioning truncated cone (22). In the working state, the two horizontal fixing parts (31) abut against the circumferential wall of the brake (4) to be tested.

4. The hydraulic drum brake testing device according to claim 1, characterized in that, The two horizontal fixing parts (31) have the same structure, including a fixing seat (311), a pushing cylinder (312), a center positioning V-block (313), and a guide rail (314). The fixing seat (311) is installed on the worktable (1). The pushing cylinder (312) and the guide rail (314) are both installed on the fixing seat (311). The center positioning V-block (313) is installed on the output end of the pushing cylinder (312) and slides with the guide rail (314).

5. The hydraulic drum brake testing device according to claim 1, characterized in that, The detection unit (5) includes a positioning mounting bracket (51), which is fixed to the upper part of the workbench (1). A guide cylinder (52) is fixedly installed on the positioning mounting bracket (51). The output direction of the guide cylinder (52) is vertically downward and towards the position of the positioning frustum (22). A concentricity detection ring gauge (53) is provided on the output shaft of the guide cylinder (52), and a center guide sleeve (54) is provided at the bottom of the concentricity detection ring gauge (53) to cooperate with the brake (4) to be tested.

6. The hydraulic drum brake testing device according to claim 1, characterized in that, The detection unit (5) also includes a positioning seat (55) and a lever cylinder (56). The positioning seat (55) is fixedly installed on the workbench (1), and the lever cylinder (56) is installed on the top of the positioning seat (55). The output end of the lever cylinder (56) is set towards the brake to be tested.

7. The hydraulic drum brake testing device according to claim 1, characterized in that, The sensing unit (6) includes an electrical control box and a limit switch, which is set on the workbench (1) and located beside the guide rail (314).

8. The hydraulic drum brake testing device according to claim 1, characterized in that, The sensing unit (6) also includes a first switch (61), a second switch (62) and an alarm light (63). The first switch (61) and the second switch (62) are located on the sides of two fixed seats (311) and installed on the workbench (1). The limit switch, the first switch (61), the second switch (62) and the alarm light (63) are all electrically connected to the electrical control box.

9. A hydraulic drum brake testing device according to claim 1, characterized in that, The workbench (1) is also equipped with a lighting lamp (7).

10. A hydraulic drum brake testing device according to claim 1, characterized in that, The electrical control box is installed on the workbench (1), and an LCD screen is provided on the side of the electrical control box.

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