Automobile brake diaphragm performance testing device

Abstract

An automobile brake diaphragm performance testing device disclosed by the present invention comprises a test bench, the top of the test bench is rotatably provided with a rotating table through a driving motor, the rotating table drives a diaphragm to be vertically aligned with a pressure test rod, and the pressure test rod performs a pressure elasticity test on the diaphragm through transverse movement of a driving member. A tensioning mechanism is movably arranged on the surface of the rotating table; the three tensioning assemblies are annularly arranged on the surface of the rotating disc, the rotating disc rotates on the side face of the rotating table in a limited mode through a transmission rotating rod, and the rotating disc rotates to drive the three tensioning assemblies to transversely move on the surface of the rotating table and position the leather film; the two sets of movable plates are arranged on the left side and the right side, close to the rotating table, of the interior of the testing table, and the testing table drives the movable plates to move up and down through an electric cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of product detection, and in particular to a device for testing the performance of a brake membrane of an automobile. Background Art

[0002] The brake diaphragm is a component used in the vacuum booster, and the vacuum booster is mainly used to provide the effect of boosting the brake. Its principle is to use atmospheric pressure to assist in the propulsion of the brake cylinder. As an important component, the diaphragm can provide a sealing effect on both sides of the vacuum chamber. The diaphragm is currently made of synthetic rubber and polymer materials. It is pressed by atmospheric pressure in the vacuum chamber to provide thrust. Therefore, it is a consumable product and will age and damage after long-term use.

[0003] Vacuum-assisted membranes are all flexible components that need to meet high elasticity and sealing requirements inside the vacuum chamber. Therefore, during the production process of the membrane, the finished membrane needs to be tested for performance, including but not limited to testing of sealing, air leakage, strength, and elasticity. The elasticity test item is to deform the membrane by pushing it, observe and record the recovery amount of the membrane per unit time, so as to determine and understand the elastic variables of the membrane;

[0004] During the current elasticity testing process, the film needs to be manually placed on the testing table, aligned with the testing rod and fixed before the testing can begin. The alignment effect during this process will affect the test accuracy, so a long and accurate alignment operation is required before the test can be carried out, which makes the test efficiency low and is not suitable for testing operations in mass production processes. In addition, after the test is completed, unqualified film products need to be sorted and collected manually, which wastes labor output.

[0005] Therefore, how to provide a vehicle brake membrane performance testing device is a problem that those skilled in the art need to solve urgently. Summary of the invention

[0006] One purpose of the present invention is to provide a vehicle brake diaphragm performance testing device, which can effectively realize the self-fixing alignment of the diaphragm and automatically sort out unqualified products, saving labor and improving testing efficiency.

[0007] According to an embodiment of the present invention, a vehicle brake membrane performance test device comprises a test bench, a rotating table is arranged on the top of the test bench through a driving motor, the rotating table drives the membrane to align vertically with a pressure test rod, the pressure test rod performs a pressure elasticity test on the membrane through a lateral movement of a driving member, and a tensioning mechanism is movably arranged on the surface of the rotating table;

[0008] Three sets of tensioning assemblies, the three sets of tensioning assemblies are annularly arranged on the surface of a rotating disk, the rotating disk is limited and rotated on the side of the rotating table through a transmission rotating rod, and the rotation of the rotating disk drives the three sets of tensioning assemblies to move horizontally on the surface of the rotating table and position the membrane;

[0009] Two groups of movable plates, the movable plates are arranged on the left and right sides of the test bench near the rotating table. The test bench drives the movable plates to move up and down through the electric cylinder. One side of the movable plate is fixed with a meshing plate through a connecting plate. Docking teeth are arranged between the movable plate and the meshing plate, and the upper and lower ends of the docking teeth can be engaged with the meshing plate and the meshing groove respectively. The meshing groove is opened on the surface of the movable plate, and the driving motor is connected to the transmission rotating rod through the docking teeth.

[0010] Furthermore, a vortex groove is provided at the outer ring position of the rotating disk, and a vortex tooth is provided at the position of the transmission rotating rod near the vortex groove, and the vortex tooth is transmission-engaged with the vortex groove, and the transmission rotating rod is movably arranged on the side of the rotating table away from the membrane through a limit seat.

[0011] Furthermore, the tensioning assembly includes an L-shaped sliding frame and a sleeve, wherein the sleeve is arranged on the surface of the sliding frame, the sleeve is elastically connected to the sliding frame via a micro-pressure spring, and the sleeve is aligned with the inner hole of the membrane.

[0012] Furthermore, a limit pin is fixed on the surface of the sliding frame, and the sliding frame slides in a limited manner between the limit pin and the oblique sliding groove, the oblique sliding groove is opened on the surface of the rotating disk, and the sliding frame fixes a slider on the other side of the sliding frame away from the limit pin, and the sliding frame slides linearly on the surface of the rotating table through the slider.

[0013] Furthermore, a steering control mechanism is arranged between the test bench and the rotating table, and the steering control mechanism includes a movable plate and docking teeth. The meshing plate has an arc-shaped shape, and the meshing plate is located directly above the docking teeth, when the arc center of the meshing groove coincides with the rotation center of the rotating table.

[0014] Furthermore, the arc of the meshing plate is located directly above the center of rotation of the rotating table. The test bench drives the meshing plate downward through the electric cylinder to engage with the top of the docking tooth, and at the same time, the arc center of the meshing plate coincides with the center of rotation of the rotating table.

[0015] Furthermore, the meshing plate is fixed at the lowest position of the meshing groove arc on the surface of the movable plate, and the docking teeth are located exactly below the meshing plate when they are rotated to 270 degrees based on the meshing groove arc center.

[0016] Furthermore, the docking teeth are arranged on the side of the rotating platform through a shaft-limited rotation, the docking teeth are meshed with fixed teeth, the fixed teeth are located on one side of the movable plate, and the fixed teeth are fixed to one end of the transmission rotating rod.

[0017] Furthermore, a blowing mechanism is provided between the test bench and the rotating table, and the blowing mechanism includes a blower and a collection box. The blower is fixed on the top of the test bench, and the vent is opened through the upper surface of the rotating table. The driving motor rotates to drive the vent on the surface of the rotating table to align with the blowing nozzle of the blower.

[0018] Furthermore, the collection box is movable at the bottom of the test bench via a slide drawer, and the blower drives the film on one side of the rotating table to be blown into the collection box for collection.

[0019] The beneficial effects of the present invention are:

[0020] The present invention can drive the membrane to rotate synchronously through the sleeve by the docking teeth arranged during the process of the rotating table being driven by the driving motor, and the membrane center can be effectively aligned with the pressure test rod during the process of the three sets of tensioning components expanding outward with the rotating disk as the center of the circle, and at the same time, after the tensioning components are expanded to the maximum, a better fixing effect of the membrane can be provided, and the expansion effect of the tensioning components is controlled by the docking teeth, and the docking teeth can synchronously drive the rotating disk to rotate during the rotation of the rotating table, so that alignment and fixation occur synchronously, which effectively improves the actual test efficiency;

[0021] The present invention arranges a meshing plate under the movable plate, which can drive the tensioning assembly to expand and align and fix during the meshing process of the butt teeth and the meshing grooves, and the movable plate as a whole can move up and down with the test bench through the electric cylinder, so that the meshing plate meshes with the top of the butt teeth. At this time, if the rotating table continues to rotate, the tensioning assembly will shrink toward the center of the rotating disk, so that the fixing effect of the membrane disappears, so that the membrane is in an oblique state inside the test bench, which is conducive to the sorting and unloading operation;

[0022] The present invention arranges a blowing mechanism between the test table and the rotating table. When the rotating table continues to rotate and maintains an inclined state, the blowing port of the blower can effectively align with the vent provided on the surface of the rotating table. At this time, the blower can blow the film directly into the collection box, thereby completing the automatic sorting operation and greatly saving labor output. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of a vehicle brake membrane performance testing device proposed by the present invention;

[0025] Figure 2 The present invention is a schematic side view of an overall vehicle brake membrane performance testing device.

[0026] Figure 3 The present invention provides a schematic diagram of the planar structure of a rotating platform of a vehicle brake membrane performance testing device.

[0027] Figure 4 The present invention is a schematic diagram of a half-section structure of a rotating platform of a vehicle brake membrane performance testing device.

[0028] Figure 5 The present invention provides a schematic diagram of the disassembly of the rotating table connection structure of a vehicle brake membrane performance testing device.

[0029] Figure 6 A vehicle brake membrane performance testing device proposed by the present invention Figure 4 Enlarged schematic diagram of the structure at point A.

[0030] Figure 7 A vehicle brake membrane performance testing device proposed by the present invention Figure 5 Enlarged schematic diagram of the structure at point B.

[0031] In the figure: 1. Test bench; 2. Turntable; 3. Drive motor; 4. Pressure test rod; 5. Blowing mechanism; 6. Tensioning mechanism; 7. Steering control mechanism;

[0032] 51. Blower; 52. Collecting box; 53. Vent; 61. Rotating plate; 62. Tensioning assembly; 63. Transmission rod; 64. Oblique slide; 65. Vortex groove; 71. Movable plate; 72. Meshing groove; 73. Meshing plate; 74. Docking teeth; 75. Fixed teeth;

[0033] 621, sliding frame; 622, limiting pin; 623, sliding block; 624, sleeve; 625, micro-pressure spring. DETAILED DESCRIPTION

[0034] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0035] refer to Figure 1-Figure 7 , including a test bench 1, a rotating table 2 is arranged on the top of the test bench 1 through a driving motor 3, the rotating table 2 drives the membrane to align vertically with the pressure test rod 4, the pressure test rod 4 performs a pressure elasticity test on the membrane through the lateral movement of the driving member, and a tensioning mechanism 6 is movably arranged on the surface of the rotating table 2;

[0036] Three sets of tensioning components 62 are arranged in an annular manner on the surface of a rotating disk 61. The rotating disk 61 is limited and rotated on the side of the rotating table 2 by a transmission rotating rod 63. The rotating disk 61 rotates to drive the three sets of tensioning components 62 to move horizontally on the surface of the rotating table 2 and position the membrane;

[0037] Two groups of movable plates 71 are arranged on the left and right sides of the test bench 1 near the rotating table 2. The test bench 1 drives the movable plate 71 to move up and down through the electric cylinder. One side of the movable plate 71 is fixed with the meshing plate 73 through a connecting plate. A docking tooth 74 is arranged between the movable plate 71 and the meshing plate 73, and the upper and lower ends of the docking tooth 74 can be engaged with the meshing plate 73 and the meshing groove 72 respectively. The meshing groove 72 is opened on the surface of the movable plate 71, and the driving motor 3 is connected to the transmission rotating rod 63 through the docking tooth 74.

[0038] In this embodiment, the driving motor 3 drives the rotating table 2 to rotate on the top of the test table 1 until one side of the rotating table 2 is aligned with the pressure test rod 4, and the membrane can be set on one side of the rotating table 2 through the tensioning component 62, so that the rotating table 2 rotates to drive the membrane and the pressure test rod 4 to align, and at this time, the pressure test rod 4 can be driven horizontally to perform an elastic pressure test on the membrane, wherein the pressure test rod 4 can use a pressure sensor to detect the deformation recovery amount of the membrane in real time during the elastic pressure test of the membrane, so as to achieve the detection purpose;

[0039] More specifically, since the fixed tooth 75 is fixed to one end of the transmission rotating rod 63, when the docking tooth 74 rotates, the fixed tooth 75 can be driven to rotate, thereby realizing the rotation of the transmission rotating rod 63, and then the rotating disk 61 is rotated. After the rotating disk 61 rotates, the three sets of tensioning components 62 can be unfolded to position the membrane so that the center of the membrane is aligned with the center of the pressure test rod 4. After the tensioning component 62 is unfolded to the maximum position, the pressure can fix the membrane so that the membrane can remain stable in the vertical direction, thereby improving the test accuracy. In this process, the rotation of the docking tooth 74 is affected by the rotating table 2, and the docking tooth 74 itself is engaged with the meshing groove 72 on the surface of the movable plate 71 during the rotation of the rotating table 2, so that the docking tooth 74 itself can rotate, thereby realizing the alignment operation in the process of the rotating table 2 turning over and driving the membrane to move to the test position, which greatly saves the actual alignment steps, enables a large number of automated testing work, and effectively improves the test efficiency;

[0040] A meshing plate 73 is fixed under the movable plate 71. After the rotating table 2 is perpendicular to the pressure test rod 4, if the membrane test result is unqualified, the movable plate 71 can be moved downward under the drive of the electric cylinder of the test table 1, so that the meshing plate 73 is engaged with the upper part of the docking tooth 74. At this time, if the rotating table 2 continues to rotate, the membrane can be driven to present a certain inclination angle. At the same time, the docking tooth 74 is reversed under the engagement of the upper meshing plate 73. The tensioning components 62 will contract with each other at this time to loosen the membrane, thereby facilitating the membrane to fall off, thereby eliminating the labor-intensive sorting operation.

[0041] refer to Figure 3 and Figure 5A vortex groove 65 is provided at the outer ring position of the rotating disk 61, and a vortex tooth is provided at a position of the transmission rotating rod 63 near the vortex groove 65, and the vortex tooth is engaged with the vortex groove 65. The transmission rotating rod 63 is movably arranged on the side of the rotating table 2 away from the membrane through a limit seat.

[0042] In this embodiment, the transmission rod 63 engages with the vortex groove 65 at the outer ring position of the rotating disk 61 through the vortex teeth. When the transmission rod 63 rotates, the vortex groove 65 will also engage and drive, driving the rotating disk 61 to rotate on the side of the rotating table 2.

[0043] refer to Figure 4 and Figure 7 The tensioning assembly 62 includes an L-shaped sliding frame 621 and a sleeve 624. The sleeve 624 is arranged on the surface of the sliding frame 621. The sleeve 624 is elastically connected to the sliding frame 621 through a slight pressure spring 625. The sleeve 624 is aligned with the inner hole of the membrane. A limit pin 622 is fixed on the surface of the sliding frame 621. The sliding frame 621 is limited and slides between the limit pin 622 and the oblique slide groove 64. The oblique slide groove 64 is provided on the surface of the rotating disk 61. A slider 623 is fixed on the other side of the sliding frame 621 away from the limit pin 622. The sliding frame 621 slides linearly on the surface of the rotating table 2 through the slider 623.

[0044] In this embodiment, the L-shaped sliding frame 621 is divided into two parts, one side of which is linearly limited and slidable with the surface of the rotating table 2 through the slider 623, and the other side is provided with a limit pin 622, and the limit pin 622 is slidably limited with the oblique slide groove 64 provided on the surface of the rotating disk 61, so that when the rotating disk 61 rotates, the oblique slide groove 64 can synchronously push the sliding frame 621 to move, so that the other part of the sliding frame 621 moves horizontally, close to or away from the center of the rotating disk 61, and the membrane is positioned;

[0045] More specifically, there is a sleeve 624 between the membrane and the sliding frame 621. Under normal circumstances, the sleeve 624 is directly aligned with the inner opening of the membrane. Therefore, when the pressure test rod 4 pushes the membrane, the sleeve 624 can synchronously slide on the surface of the sliding frame 621 and squeeze the micro-pressure spring 625 to make it elastically deform, thereby satisfying the flattening effect of the membrane. When the pressure test rod 4 releases the membrane, the micro-pressure spring 625 will provide an elastic reset force, which will affect the actual test accuracy. Therefore, it is necessary to calibrate based on this force, so as to accurately test the size of the elastic restoring force of the membrane through the pressure test rod 4.

[0046] refer to Figure 1 , Figure 4 and Figure 6A steering control mechanism 7 is provided between the test bench 1 and the rotating table 2. The steering control mechanism 7 includes a movable plate 71 and a docking tooth 74. The outer shape of the meshing plate 73 is arc-shaped, and the position of the meshing plate 73 is located directly above the docking tooth 74. When the arc center of the meshing groove 72 coincides with the rotation center of the rotating table 2. The arc of the meshing plate 73 is located directly above the rotation center of the rotating table 2. The test bench 1 drives the meshing plate 73 downward through the electric cylinder to mesh with the top of the docking tooth 74, and at the same time, the arc center of the meshing plate 73 coincides with the rotation center of the rotating table 2. The meshing plate 73 is fixed at the bottom of the surface of the movable plate 71 near the arc position of the meshing groove 72. When the docking tooth 74 rotates to 270 degrees based on the arc center of the meshing groove 72, it is just located below the meshing plate 73. The docking tooth 74 is set on the side of the rotating table 2 through the shaft limit rotation. The docking tooth 74 and the fixed tooth 75 are meshed with each other. The fixed tooth 75 is located on one side of the movable plate 71, and the fixed tooth 75 is fixed to one end of the transmission rotating rod 63.

[0047] In this embodiment, when the rotating table 2 rotates, the docking teeth 74 can be driven to rotate synchronously. The docking teeth 74 rotate on the meshing groove 72. The meshing effect between the docking teeth 74 and the meshing groove 72 makes the docking teeth 74 rotate around the rotation center of the rotating table 2. One side of the docking teeth 74 meshes with the fixed teeth 75, and the fixed teeth 75 are fixed to the transmission rotating rod 63. In this way, the rotating disk 61 can be driven to rotate, so that the tensioning assembly 62 can position the membrane during the turning process of the rotating table 2.

[0048] When the rotating table 2 rotates to a vertical state, the docking tooth 74 is located between the meshing groove 72 and the meshing plate 73. First, the pressure test rod 4 will perform an elasticity test on the membrane. When the test result is unqualified, the test table 1 will first drive the movable plate 71 to descend through the electric cylinder, so that the docking tooth 74 is separated from the meshing groove 72, and the meshing plate 73 will descend synchronously, so that the meshing plate 73 engages with the top of the docking tooth 74. In this way, the rotating table 2 continues to drive for a distance, and the rotation effect and rotation direction provided by the meshing plate 73 to the docking tooth 74 are opposite to those before. In this way, the tensioning assembly 62 will loosen the membrane, and cooperate with the inclined state of the membrane to realize automatic sorting and unloading operations, effectively reducing the output of labor.

[0049] refer to Figure 1-Figure 3 A blowing mechanism 5 is provided between the test bench 1 and the rotating table 2. The blowing mechanism 5 includes a blower 51 and a collection box 52. The blower 51 is fixed on the top of the test bench 1. The vent 53 is provided on the upper surface of the rotating table 2. The driving motor 3 rotates to drive the vent 53 on the surface of the rotating table 2 to align with the blowing nozzle of the blower 51. The collection box 52 moves at the bottom of the test bench 1 through a slide. The blower 51 drives the film on one side of the rotating table 2 to be blown into the collection box 52 for collection.

[0050] In this embodiment, when the rotating table 2 drives the membrane to tilt, the air vent 53 above the rotating table 2 is aligned with the blower 51 fixed on the top of the test bench 1. At this time, the blower 51 blows air, and the air pressure can effectively facilitate the separation between the membrane and the sleeve 624, thereby improving the reliability of sorting and unloading, and allowing unqualified membranes to fall into the collection box 52 for unloading.

[0051] Working principle: first, place the membrane on the surface of the rotating table 2 so that the three sets of sleeves 624 are flush with the opening of the membrane, and then drive the motor 3 to drive the rotating table 2 to rotate. During this process, the membrane is limited by the sleeve 624 and will not fall off. At the same time, the rotating table 2 will drive the docking teeth 74 in the steering control mechanism 7 to rotate, and the meshing groove 72 is engaged with the meshing groove 72 opened on the surface of the movable plate 71, so that the docking teeth 74 themselves rotate, and one side of the docking teeth 74 is engaged with the fixed teeth 75, and the fixed teeth 75 are fixed to the transmission rotating rod in the tensioning mechanism 6. 63 ends, so that the transmission rotating rod 63 rotates, and the transmission rotating rod 63 drives the rotating disk 61 to rotate on the side of the rotating table 2 through the meshing effect of the vortex teeth and the vortex grooves 65. At this time, an oblique sliding groove 64 is opened on the surface of the rotating disk 61, and the oblique sliding groove 64 is limited by the limit pin 622 in the tensioning component 62, and one side of the sliding frame 621 slides linearly with the rotating table 2 through the slider 623. In this way, under the pushing effect, the sliding frame 621 will move linearly as a whole, driving the sleeve 624 to expand and position the membrane port position, and then the rotating table 2 is rotated to a vertical state, and the sleeve 624 is also driven by the sliding frame 621 to position the membrane, so that the center of the membrane is aligned with the center of the pressure test rod 4, and then the pressure test rod 4 squeezes the membrane, and the sleeve 624 slides on the surface of the sliding frame 621 under the elastic action of the micro-pressure spring 625, and then the pressure test rod 4 releases the membrane, and the pressure sensor or other equipment at the end of the pressure test rod 4 is used to test the membrane restoring force, thereby achieving a basic elastic force test effect. When the test result is defective, the test bench 1 is driven by the electric cylinder to The movable plate 71 descends, so that the meshing groove 72 is separated from the docking tooth 74, and the meshing plate 73 is engaged with the top of the docking tooth 74. Then the rotating table 2 continues to drive for a distance, and the docking tooth 74 is reversed at this time. The tensioning component 62 will also loosen the membrane. At the same time, the rotation effect of the rotating table 2 will drive the membrane to present an inclined posture until the vent 53 in the blowing mechanism 5 above the rotating table 2 is aligned with the blower 51. The blower 51 blows air at this time, and the air pressure blows directly on the back of the membrane through the vent 53, and the membrane is blown into the collection box 52 for collection.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vehicle brake membrane performance testing device, characterized in that: The test bench (1) comprises a rotating table (2) on the top of which a driving motor (3) is driven to rotate, the rotating table (2) drives the membrane to align vertically with a pressure test rod (4), the pressure test rod (4) performs a pressure elasticity test on the membrane through the lateral movement of a driving member, and a tensioning mechanism (6) is movably arranged on the surface of the rotating table (2); Three groups of tensioning assemblies (62), the three groups of tensioning assemblies (62) are arranged in an annular shape on the surface of a rotating disk (61), the rotating disk (61) is limitedly rotated on the side of the rotating table (2) by a transmission rotating rod (63), and the rotation of the rotating disk (61) drives the three groups of tensioning assemblies (62) to move horizontally on the surface of the rotating table (2) and position the membrane; Two groups of movable plates (71) are provided, the movable plates (71) being arranged on the left and right sides of the inside of the test bench (1) near the rotating platform (2); the test bench (1) drives the movable plates (71) to move up and down through an electric cylinder; one side of the movable plates (71) is fixed with a meshing plate (73) through a connecting plate; a docking tooth (74) is provided between the movable plates (71) and the meshing plate (73); and the upper and lower ends of the docking tooth (74) can respectively mesh with the meshing plate (73) and a meshing groove (72); the meshing groove (72) is provided on the surface of the movable plate (71); and the driving motor (3) is connected to the transmission rotating rod (63) through the docking tooth (74).

2. The vehicle brake membrane performance testing device according to claim 1 is characterized in that: The outer ring of the rotating disk (61) is provided with a vortex groove (65), the transmission rotating rod (63) is provided with a vortex tooth near the vortex groove (65), and the vortex tooth is engaged with the vortex groove (65), and the transmission rotating rod (63) is movably arranged on a side of the rotating platform (2) away from the membrane through a limit seat.

3. The vehicle brake membrane performance testing device according to claim 1 is characterized in that: The tensioning assembly (62) includes an L-shaped sliding frame (621) and a sleeve (624), wherein the sleeve (624) is arranged on the surface of the sliding frame (621), and the sleeve (624) is elastically connected to the sliding frame (621) via a micro-pressure spring (625), and the sleeve (624) is aligned with the inner hole of the membrane.

4. The vehicle brake membrane performance testing device according to claim 3 is characterized in that: A limit pin (622) is fixed on the surface of the sliding frame (621), and the sliding frame (621) is limited and slidable between the limit pin (622) and the oblique sliding groove (64), and the oblique sliding groove (64) is provided on the surface of the rotating disk (61), and a sliding block (623) is fixed on the other side of the sliding frame (621) away from the limit pin (622), and the sliding frame (621) slides linearly on the surface of the rotating table (2) through the sliding block (623).

5. The vehicle brake membrane performance testing device according to claim 1 is characterized in that: A steering control mechanism (7) is provided between the test bench (1) and the rotating platform (2), the steering control mechanism (7) comprising a movable plate (71) and a mating tooth (74), the meshing plate (73) having an arc shape, and the meshing plate (73) is located directly above the mating tooth (74), when the arc center of the meshing groove (72) coincides with the rotation center of the rotating platform (2).

6. The vehicle brake membrane performance testing device according to claim 5, characterized in that: The arc of the meshing plate (73) is located directly above the center of rotation of the rotating platform (2). The testing platform (1) drives the meshing plate (73) to move downward through the electric cylinder to mesh with the top of the docking teeth (74), and at the same time, the arc center of the meshing plate (73) coincides with the center of rotation of the rotating platform (2).

7. The vehicle brake membrane performance testing device according to claim 6 is characterized in that: The meshing plate (73) is fixed at the bottom of the surface of the movable plate (71) near the arc position of the meshing groove (72), and the docking teeth (74) are exactly located below the meshing plate (73) when they rotate to 270 degrees based on the arc center of the meshing groove (72).

8. The vehicle brake membrane performance testing device according to claim 7 is characterized in that: The docking teeth (74) are arranged on the side of the rotating platform (2) through a shaft-limiting rotation, and the docking teeth (74) are meshed with fixed teeth (75). The fixed teeth (75) are located on one side of the movable plate (71), and the fixed teeth (75) are fixed to one end of the transmission rotating rod (63).

9. The automobile brake membrane performance testing device according to claim 1 is characterized in that: A blowing mechanism (5) is provided between the test bench (1) and the rotating table (2), the blowing mechanism (5) comprising a blower (51) and a collecting box (52), the blower (51) being fixed on the top of the test bench (1), the vent (53) penetrating through and opening at the upper surface of the rotating table (2), and the driving motor (3) rotating to drive the vent (53) on the surface of the rotating table (2) to align with the blowing nozzle of the blower (51).

10. The vehicle brake membrane performance testing device according to claim 9, characterized in that: The collecting box (52) is movable at the bottom of the test bench (1) via a slide, and the blower (51) drives the film on one side of the rotating table (2) to be blown into the collecting box (52) for collection.

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