A sealing performance testing device for automobile brake calipers

Abstract

The present invention discloses a sealing performance testing device for automobile brake calipers, which relates to the technical field of sealing testing, and comprises a workbench, a support frame is fixedly connected to the middle of the workbench, a compressed air source is fixedly connected to the top of the support frame, a storage plate is fixedly connected to the middle of the support frame, and a sound amplification protection mechanism is also included. Through the setting of the sound amplification protection mechanism, a tester can manually rotate a sound collecting cover to move around the storage plate and the outside of the brake caliper to be tested. Due to the smooth inner wall and arc setting of the sound collecting cover, smaller air leakage phenomena can be captured and directly judged as unqualified. For weaker air leakage phenomena, pressure data needs to be obtained before judgment, thereby reducing the number of brake caliper tests, thereby improving the test efficiency. At the same time, the sliding sleeve can be connected to the convex disk at any time, so that the sound collecting cover can be fixed at different positions, and the tester can release his hands to record data, adjust the test instrument or observe the pressure gauge, etc., so as to flexibly assist in sound collection.

Description

Technical Field

[0001] The invention relates to the technical field of sealing detection, in particular to a sealing performance detection device for automobile brake calipers. Background Art

[0002] Automobile brake calipers are components specially designed for disc brake systems. When braking, high-pressure brake oil pushes the piston inside the brake caliper, pressing the brake shoe against the brake disc, thereby generating friction resistance to slow down, stop or keep the wheel stationary. Therefore, the sealing performance testing of the brake caliper is a key step to ensure the safety and reliability of the braking system.

[0003] In the prior art, the inflation test method is generally used to test the sealing of the brake caliper. By filling the brake caliper with gas of a certain pressure, the leakage rate of the brake caliper is judged according to the degree of pressure reduction, thereby judging whether it meets the product standards. After the brake caliper is inflated, it is necessary to wait for its internal pressure to stabilize and reach a balance stage. At this stage, the brake caliper can be checked for obvious leakage. If there is obvious leakage, it can be directly judged as unqualified. Specifically, the inspector hears the sound of gas leakage or sees a significant drop in the pressure gauge reading. However, if the sound of gas leakage is relatively small, the inspector may be injured by mistake if he listens closely to the sound. Therefore, generally only very obvious leakage can be discovered. In most cases, it is still necessary to wait for the pressure data to be obtained before making a judgment, which makes the sealing test time basically determined and the test efficiency difficult to improve.

[0004] In addition, when conducting an inflation-type seal test on a brake caliper, temperature and humidity are two crucial environmental factors. Temperature can cause the material used to make the brake caliper to expand and contract, and the hygroscopicity of the material can cause changes in physical form. Therefore, a thermometer and hygrometer are usually used to monitor the temperature and humidity of the environment in the sealing test area. However, if a thermometer and hygrometer is placed in a fixed position for a long time, it may be affected by the specific environmental factors of that position, such as direct sunlight, heat sources, cold sources, ventilation conditions, etc., resulting in deviations in the measurement results.

[0005] In view of this, the present invention proposes a sealing performance detection device for automobile brake calipers to make up for and improve the deficiencies of the prior art. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a sealing performance detection device for automobile brake calipers, which can improve detection efficiency; can improve detection safety; and can make the results of a thermometer and hygrometer reflect the actual environmental conditions, so as to solve the corresponding technical problems raised in the above background technology.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: a sealing performance detection device for automobile brake calipers, comprising a workbench, a support frame is fixedly connected to the middle of the workbench, a compressed air source is fixedly connected to the top of the support frame, a storage plate is fixedly connected to the middle of the support frame, and also includes:

[0008] A sound amplification protection mechanism for collecting the sound of air leakage and switching the protection mode during exhaust;

[0009] The displacement measuring mechanism is used to measure the ambient temperature and humidity by moving the position at irregular intervals.

[0010] Preferably, the sound amplification protection mechanism includes a pair of rotating shafts rotatably connected to both sides of the middle part of the support frame, and one end of the pair of rotating shafts close to each other is commonly fixedly connected to a sound collecting cover, arc grooves are provided on both sides of the sound collecting cover, and a pair of spherical arc plates are slidably connected to the inner wall of the sound collecting cover, and the pair of spherical arc plates are both slidably connected in the arc grooves, and a loudspeaker is fixedly connected to the center of the sound collecting cover.

[0011] Preferably, the sound amplification protection mechanism also includes a screw, which is threadedly connected to the top of the spherical arc plate on one side, and a threaded groove is correspondingly opened on the top edge of the spherical arc plate on the other side. A first magnetic strip is fixed in the center of the top of the two spherical arc plates, and a pair of second magnetic strips are fixedly connected to the side of the sound collecting cover close to the rotating shaft, and the first magnetic strip and the second magnetic strip are magnetically connected to each other.

[0012] Preferably, the sound amplification protection mechanism also includes a protrusion plate, which is fixedly connected to the middle outer surface of the support frame, and the inner wall of the protrusion plate is rotatably connected to the outer wall of the rotating shaft. A sliding sleeve is slidably connected to the side of the rotating shaft close to the protrusion plate, and a plurality of slots are provided on the side of the sliding sleeve close to the support frame. The outer wall of the protrusion plate is slidably engaged in the slot, and a handwheel is fixedly connected to the side of the sliding sleeve away from the support frame.

[0013] Preferably, the displacement measuring mechanism includes a pair of pulleys, the outer walls of the pair of pulleys are jointly sleeved with an annular belt, the upper pulley is fixedly connected to the rotating shaft, the lower pulley is rotatably connected to the bottom side wall of the support frame, the lower pulley is fixedly connected to a turntable on the side away from the support frame, the inner wall of the turntable is connected with a plurality of pawls that rotate equidistantly around the circumference, the middle parts of the plurality of pawls are fixedly connected to reset springs, and the ends of the plurality of reset springs away from the pawls are fixedly connected to the inner wall of the turntable.

[0014] Preferably, the displacement measuring mechanism also includes a ring rail fixedly connected to the bottom of the support frame, the top of the ring rail is rotatably connected to a toothed ring, the toothed ring and the ratchet are mutually engaged, the side of the toothed ring away from the annular belt is fixedly connected to a mobile platform, the top of the mobile platform is rotatably connected to a thermometer and hygrometer, and the bottom of the mobile platform is slidably connected to the top of the ring rail.

[0015] Preferably, the thermometer and hygrometer is cylindrical, and the diameter of the thermometer and hygrometer does not exceed the edge of the mobile platform.

[0016] Preferably, the inner wall of the sliding sleeve is provided with a limiting sliding groove matched with the end of the rotating shaft.

[0017] Preferably, the pair of spherical arc plates are centrally symmetrically arranged with the loudspeaker as the axis, and the sliding directions of the pair of spherical arc plates are opposite.

[0018] Preferably, the sound collecting cover is arranged in a circular arc with a smooth inner wall, and the storage plate is located above the rotating shaft.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. After the brake caliper to be tested is inflated, the tester can manually rotate the sound collecting cover to move around the storage plate and the outside of the brake caliper to be tested through the setting of the sound amplification protection mechanism. Due to the smooth inner wall and arc setting of the sound collecting cover, smaller air leakage phenomena can be captured and directly judged as unqualified. For weaker air leakage phenomena, pressure data needs to be obtained before judgment, thereby reducing the number of brake caliper tests and improving the detection efficiency;

[0021] Among them, the sliding sleeve can be connected with the convex disk at any time, so that the sound collecting cover can be fixed at different positions. The inspector can release his hands to record data, adjust the inspection instrument or observe the pressure gauge, etc., which is flexible to assist in sound collection. When the sound collecting cover is not in use, the sliding sleeve and the convex disk can be used to limit the sound collecting cover and place it at an oblique position. The outer wall is used to block the natural dust, so as to avoid the accumulation of dust on the inner wall of the sound collecting cover to affect the smoothness, thereby reducing the effect of capturing the sound of air leakage.

[0022] 2. Through the setting of the spherical arc plate, when exhausting, the spherical arc plate arranged symmetrically at the center can be pulled out and fixed along the spherical arc of the arc groove, and extended into a protective cover mode, so that the brake caliper to be tested is completely wrapped inside the protective cover. During the deflation process, even if the brake caliper slips due to unstable air pressure, it can be blocked by the protective cover formed by the spherical arc plate and the sound-collecting cover, which not only avoids the product from falling and being damaged, but also prevents accidental injuries to the inspectors, thereby improving the safety of the inspection;

[0023] 3. Through the setting of the displacement measurement mechanism, when the sound collecting cover is rotated, the rotation of its rotating shaft can finally rotate the turntable. Due to the setting of the ratchet, the toothed ring can only rotate in one direction to prevent the displacement of the thermometer and hygrometer from being offset after the forward and reverse rotation. The toothed ring drives the thermometer and hygrometer to move along the track of the ring track, changes its position near the detection area, and measures the temperature and humidity data, which can avoid human activities from interfering with the measurement results of the thermometer and hygrometer. In addition, since the detection operation is a process of constantly searching for leaks, it will cause uncertainty in the rotation distance and direction, and then the thermometer and hygrometer will be randomly changed in position in the detection area, which can effectively avoid local errors in the measurement of the thermometer and hygrometer, so that its results can reflect the real environmental conditions and provide accurate basis for the decision of whether to change the ambient temperature and humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0026] Figure 3 The present invention shows Figure 2 The enlarged structural diagram at B in the middle;

[0027] Figure 4 It is a structural schematic diagram of the connection between the ball arc plate shown in the present invention;

[0028] Figure 5 It is a structural schematic diagram of the second magnetic strip connection portion shown in the present invention;

[0029] Figure 6 It is a structural schematic diagram of the connection between the lug and the disk shown in the present invention;

[0030] Figure 7 The present invention shows Figure 6 The enlarged structural diagram at C in the middle;

[0031] Figure 8 The present invention shows Figure 1 The enlarged structural diagram at A in the middle;

[0032] Fig. 9 It is a structural schematic diagram of the rotary disk connection shown in the present invention;

[0033] Fig.10 The present invention shows Fig. 9 Schematic diagram of the structure enlarged at point D in the middle.

[0034] The numbers in the figure are:

[0035] 1. Workbench; 2. Compressed air source; 3. Support frame; 4. Storage board;

[0036] 5. Sound amplification protection mechanism; 51. Sound collecting cover; 52. Loudspeaker; 53. Hand wheel; 54. Sliding sleeve; 55. Ball arc plate; 56. First magnetic strip; 57. Second magnetic strip; 58. Screw; 59. Lug plate; 510. Rotating shaft; 511. Arc groove; 512. Card slot;

[0037] 6. Displacement measuring mechanism; 61. Annular belt; 62. Turntable; 63. Thermohygrometer; 64. Annular rail; 65. Toothed ring; 66. Ratchet; 67. Return spring; 68. Moving platform; 69. Pulley. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiments of the present invention

[0040] Please refer to Figures 1 to 10 As shown, a sealing performance testing device for automobile brake calipers includes a workbench 1, a support frame 3 is fixedly connected to the middle of the workbench 1, a compressed air source 2 is fixedly connected to the top of the support frame 3, a storage plate 4 is fixedly connected to the middle of the support frame 3, and also includes:

[0041] A sound amplification protection mechanism 5, used to collect the sound of air leakage and switch the protection mode during exhaust;

[0042] A displacement measuring mechanism 6, used for irregularly moving positions to measure ambient temperature and humidity;

[0043] The sound amplification protection mechanism 5 includes a pair of rotating shafts 510 rotatably connected to both sides of the middle of the support frame 3, and a sound collecting cover 51 is fixedly connected to one end of the pair of rotating shafts 510 close to each other. Both sides of the sound collecting cover 51 are provided with arc grooves 511, and the inner wall of the sound collecting cover 51 is slidably connected to a pair of spherical arc plates 55, and the pair of spherical arc plates 55 are slidably connected in the arc grooves 511. A loudspeaker 52 is fixedly connected to the center of the sound collecting cover 51;

[0044] The sound amplification protection mechanism 5 also includes a screw 58, which is threadedly connected to the top of the spherical arc plate 55 on one side, and a threaded groove is correspondingly opened on the top edge of the spherical arc plate 55 on the other side. A first magnetic strip 56 is fixed in the center of the top of the two spherical arc plates 55, and a pair of second magnetic strips 57 are fixedly connected to one side of the sound collecting cover 51 close to the rotating shaft 510, and the first magnetic strip 56 and the second magnetic strip 57 are magnetically connected to each other;

[0045] The sound amplification protection mechanism 5 also includes a convex plate 59, which is fixedly connected to the middle outer surface of the support frame 3, and the inner wall of the convex plate 59 is rotatably connected to the outer wall of the rotating shaft 510. The rotating shaft 510 is slidably connected to a sliding sleeve 54 on the side close to the convex plate 59. The sliding sleeve 54 is provided with a plurality of slots 512 on the side close to the support frame 3. The outer wall of the convex plate 59 is slidably engaged in the slots 512, and the side of the sliding sleeve 54 away from the support frame 3 is fixedly connected to a hand wheel 53;

[0046] The inner wall of the sliding sleeve 54 is provided with a limiting sliding groove adapted to the end of the rotating shaft 510;

[0047] A pair of spherical arc plates 55 are centrally symmetrically arranged with the loudspeaker 52 as the axis, and the sliding directions of the pair of spherical arc plates 55 are opposite;

[0048] The sound collecting cover 51 is in the form of an arc with a smooth inner wall, and the storage plate 4 is located above the rotating shaft 510;

[0049] The first magnetic strip 56 and the second magnetic strip 57 are used to prevent the spherical arc plate 55 from sliding out of the sound collecting cover 51 during the sound collection process.

[0050] The effects achieved by this embodiment are as follows: In the prior art, if the sound of gas leakage is relatively small, there is a risk of accidental injury if the inspector gets close to listen to the sound. Therefore, generally only very obvious leakage can be discovered. In most cases, it is still necessary to wait for the pressure data to be obtained before making a judgment, so that the sealing detection time is basically determined, and the detection efficiency is difficult to improve. Compared with the prior art, through the implementation of this embodiment, a sound amplification protection mechanism 5 is provided to manually rotate the sound collecting cover 51 to move around the storage plate 4 and the outside of the brake caliper to be tested. Due to the smooth inner wall and arc setting of the sound collecting cover 51, smaller leakage can be captured and directly judged as unqualified, thereby improving the detection efficiency.

[0051] Further examples:

[0052] Please refer to Figure 1 , Figure 2 , Figures 8 to 10 As shown, the displacement measuring mechanism 6 includes a pair of pulleys 69, the outer walls of the pair of pulleys 69 are commonly sleeved with an annular belt 61, the upper pulley 69 is fixedly connected to the rotating shaft 510, the lower pulley 69 is rotatably connected to the bottom side wall of the support frame 3, the lower pulley 69 is fixedly connected to a turntable 62 on the side away from the support frame 3, the inner wall of the turntable 62 is rotatably connected to a plurality of pawls 66 equidistantly around the circumference, the middle parts of the plurality of pawls 66 are fixedly connected to a reset spring 67, and the ends of the plurality of reset springs 67 away from the pawls 66 are fixedly connected to the inner wall of the turntable 62;

[0053] The displacement measuring mechanism 6 also includes a ring rail 64 fixedly connected to the bottom of the support frame 3, a toothed ring 65 is rotatably connected to the top of the ring rail 64, the toothed ring 65 and the ratchet 66 are mutually engaged, a moving platform 68 is fixedly connected to the side of the toothed ring 65 away from the annular belt 61, a thermometer and hygrometer 63 is rotatably connected to the top of the mobile platform 68, and the bottom of the mobile platform 68 is slidably connected to the top of the ring rail 64;

[0054] The thermometer and hygrometer 63 is cylindrical, and the diameter of the thermometer and hygrometer 63 does not exceed the edge of the moving platform 68;

[0055] Among them: the thermometer and hygrometer 63 with a defined shape and size is used to rotate the screen at any position to facilitate observation of data while avoiding movement obstruction.

[0056] The effects achieved by this embodiment are as follows: In the prior art, the thermometer and hygrometer 63 placed in a fixed position for a long time may be affected by the specific environmental factors of the position, such as direct sunlight, heat source, cold source, ventilation conditions, etc., resulting in deviations in the measurement results. Compared with the prior art, through the implementation of this embodiment, the displacement measurement mechanism 6 is set to use a ratchet 66 so that the toothed ring 65 can only rotate in one direction, thereby preventing the displacement of the thermometer and hygrometer 63 from being offset after the forward and reverse rotation. The toothed ring 65 drives the thermometer and hygrometer 63 to move along the track of the ring track 64, change its position near the detection area, and measure the temperature and humidity data, thereby avoiding interference of human activities on the measurement results of the thermometer and hygrometer 63.

[0057] The complete usage steps and working principle of the above embodiment are as follows:

[0058] In the initial state: the inner wall of the sound collecting cover 51 faces the direction of the inspector, the sliding sleeve 54 and the protrusion plate 59 are in a clamping state, the ball arc plate 55 is located on the inner wall of the sound collecting cover 51, the first magnetic strip 56 and the second magnetic strip 57 are magnetically attracted to each other, and the turntable 62 is in a stationary state.

[0059] When in use, the inspector first places the brake caliper to be inspected on the storage plate 4 and fixes the brake caliper steadily, then connects the compressed air source 2 with the brake caliper through an external air pipe, then opens the air valve to inflate the inside of the brake caliper, and then closes the air valve, waits for the gas inside the brake caliper to be balanced, and finally judges whether the sealing is qualified based on the internal air pressure change data. During the waiting process, the inspector can move the handwheel 53 away from the sound collecting cover 51, and simultaneously drive the sliding sleeve 54 to release the clamping connection with the bump plate 59. At this time, the inspector can turn the handwheel 53, and drive the rotating shaft 510 to rotate through the handwheel 53, and then drive the sound collecting cover 51 and the rotating shaft 510 on the other side to rotate through the rotating shaft 510. The sound collecting cover 51 is located above the rotating shaft 510, so when the sound collecting cover 51 rotates, it can move around the storage plate 4 and the outside of the brake caliper to be tested, and can rotate arbitrarily in the remaining range except the top. The smooth inner wall and arc setting of the sound collecting cover 51 can capture the smaller leakage sound emitted by the brake caliper at different positions, and the sliding sleeve 54 can be clamped with the convex plate 59 at any time, so that the sound collecting cover 51 can be fixed at different positions to assist in sound collection, and then the sound is collected and amplified to the outside through the loudspeaker 52 at the center of the sound collecting cover 51, so that the tester can clearly hear the leakage sound, and can directly judge the leaking brake caliper as unqualified, and replace the new brake caliper to be tested in time, without waiting for the pressure data to be obtained before judging, which is conducive to improving the detection efficiency;

[0060] Furthermore, whenever the seal test of the inflated brake caliper is completed, the gas inside it needs to be discharged. At this time, the inspector can pull out a pair of spherical arc plates 55 from the arc groove 511, cover the top of the brake caliper to be inspected along the spherical arc, and completely wrap it inside. Then, the screw 58 is rotated into the threaded groove of the corresponding spherical arc plate 55 to fix the pair of spherical arc plates 55 to each other, and the switching of the protective cover mode is completed. The uncovered areas on both sides can be reserved as the connection points of the external air pipe, and the vertical side walls of the support frame 3 are also used as barriers on both sides of the sound collecting cover 51, so that during the deflation process of the brake caliper to be inspected, even if the air pressure is unstable and it slips, it can be blocked by the protective cover formed by the spherical arc plate 55, which not only avoids the product from falling and being damaged, but also prevents accidental injuries to the inspectors, thereby improving the safety of the inspection.

[0061] Please refer to the above working process Figures 1 to 7 .

[0062] Furthermore, when the rotating shaft 510 rotates, it can also drive the upper pulley 69 to rotate synchronously. Under the transmission of the annular belt 61, the lower pulley 69 can rotate, so that the turntable 62 also rotates, and the turntable 62 drives the pawl 66 to rotate synchronously. When observed from the side direction, when the turntable 62 rotates counterclockwise, the pawl 66 will be squeezed with the surface of the toothed ring 65, compressing the reset spring 67, and after passing through the toothed ring 65, it will be reset by the elastic force of the reset spring 67. When the turntable 62 rotates clockwise, it can drive the pawl The claw 66 is constantly engaged with the toothed ring 65, so that the toothed ring 65 rotates on the top of the ring track 64, thereby driving the mobile platform 68 and the thermohygrometer 63 to move along the track of the ring track 64, and realizing the unidirectional rotation of the toothed ring 65. Since the detection operation is a process of constantly searching for leaks, it will lead to uncertainty in the rotation distance and direction, and then the thermohygrometer 63 will be randomly changed in the detection area, which can effectively avoid local errors in the measurement of the thermohygrometer 63, so that the result can reflect the real environmental conditions;

[0063] Please refer to the above working process Figure 1 , Figure 2 , Figures 8 to 10 .

[0064] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing performance testing device for an automobile brake caliper, comprising a workbench (1), a support frame (3) fixedly connected to the middle of the workbench (1), a compressed air source (2) fixedly connected to the top of the support frame (3), and a storage plate (4) fixedly connected to the middle of the support frame (3), characterized in that: It also includes: a sound amplification protection mechanism (5) for collecting the sound of air leakage and switching the protection mode when exhausting; a displacement measurement mechanism (6) for irregularly moving the position to measure the ambient temperature and humidity; The sound amplification protection mechanism (5) comprises a pair of rotating shafts (510) rotatably connected to both sides of the middle of the support frame (3); one end of the pair of rotating shafts (510) close to each other is fixedly connected to a sound collecting cover (51); both sides of the sound collecting cover (51) are provided with arc grooves (511); the inner wall of the sound collecting cover (51) is slidably connected to a pair of spherical arc plates (55); the pair of spherical arc plates (55) are slidably connected in the arc grooves (511); and a loudspeaker (52) is fixedly connected at the center of the sound collecting cover (51).

2. A sealing performance testing device for automobile brake calipers according to claim 1, characterized in that: The sound amplification protection mechanism (5) further comprises a screw (58), wherein the screw (58) is threadedly connected to the top of the spherical arc plate (55) on one side, and a threaded groove is correspondingly provided on the top edge of the spherical arc plate (55) on the other side. A first magnetic strip (56) is fixed in the center of the top of the two spherical arc plates (55), and a pair of second magnetic strips (57) are fixedly connected to one side of the sound collecting cover (51) close to the rotating shaft (510), and the first magnetic strip (56) and the second magnetic strip (57) are magnetically connected to each other.

3. The sealing performance detection device for automobile brake calipers according to claim 1, characterized in that: The sound amplification protection mechanism (5) further comprises a protrusion plate (59), wherein the protrusion plate (59) is fixedly connected to the middle outer surface of the support frame (3), the inner wall of the protrusion plate (59) is rotatably connected to the outer wall of the rotating shaft (510), a sliding sleeve (54) is slidably connected to a side of the rotating shaft (510) close to the protrusion plate (59), a plurality of slots (512) are formed on a side of the sliding sleeve (54) close to the support frame (3), the outer wall of the protrusion plate (59) is slidably engaged in the slots (512), and a hand wheel (53) is fixedly connected to a side of the sliding sleeve (54) away from the support frame (3).

4. The sealing performance testing device for automobile brake calipers according to claim 1, characterized in that: The displacement measuring mechanism (6) comprises a pair of pulleys (69), the outer walls of the pair of pulleys (69) are jointly sleeved with an annular belt (61), the upper pulley (69) is fixedly connected to the rotating shaft (510), the lower pulley (69) is rotatably connected to the bottom side wall of the support frame (3), the lower pulley (69) is fixedly connected to a rotating disk (62) on the side away from the support frame (3), the inner wall of the rotating disk (62) is rotatably connected to a plurality of ratchet pawls (66) equidistantly around the circumference, the middle parts of the plurality of ratchet pawls (66) are fixedly connected to a return spring (67), and the ends of the plurality of return springs (67) away from the ratchet pawls (66) are fixedly connected to the inner wall of the rotating disk (62).

5. The sealing performance testing device for automobile brake calipers according to claim 4, characterized in that: The displacement measuring mechanism (6) further comprises a ring rail (64) fixedly connected to the bottom of the support frame (3); the top of the ring rail (64) is rotatably connected to a toothed ring (65); the toothed ring (65) and a ratchet (66) are mutually engaged; a moving platform (68) is fixedly connected to the side of the toothed ring (65) away from the annular belt (61); the top of the moving platform (68) is rotatably connected to a thermometer and hygrometer (63); and the bottom of the moving platform (68) is slidably connected to the top of the ring rail (64).

6. The sealing performance testing device for automobile brake calipers according to claim 5, characterized in that: The thermometer and hygrometer (63) is arranged in a cylindrical shape, and the diameter of the thermometer and hygrometer (63) does not exceed the edge of the moving platform (68).

7. The sealing performance testing device for automobile brake calipers according to claim 3, characterized in that: The inner wall of the sliding sleeve (54) is provided with a limiting sliding groove matched with the end of the rotating shaft (510).

8. The sealing performance testing device for automobile brake calipers according to claim 1, characterized in that: The pair of spherical arc plates (55) are centrally symmetrically arranged with the loudspeaker (52) as the axis, and the sliding directions of the pair of spherical arc plates (55) are opposite.

9. The sealing performance testing device for automobile brake calipers according to claim 1, characterized in that: The sound collecting cover (51) is arranged in the form of an arc with a smooth inner wall, and the storage plate (4) is located above the rotating shaft (510).

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