Air tightness detection device for automotive brake

Abstract

An air tightness detection device of an automotive brake comprises an air compressor, an air cylinder, a bottom plate, front supporting columns, a cross beam, supporting beams, rear supporting columns, pressure sensors and a pressure head mechanism, the multiple front supporting columns are installed at the front end of the bottom plate, the lower ends of the two supporting beams are installed on the two sides of the bottom plate respectively, and the rear supporting columns are installed at the rear end of the bottom plate; the pressing head mechanism comprises a connecting base, a pressing head and a sealing ring, the lower end of a piston rod of the air cylinder and the upper end of the connecting base are installed together, a positioning groove is formed in the lower outer side of a communicating pipe of the connecting base, an installation groove is formed in the inner side end of the pressing head, and the outer side of the sealing ring is installed in the installation groove. The outer side of the pressure head is mounted in the positioning groove; the outer side end of the side end connecting pipe of the communicating pipe is connected with an air inlet pipe of the pressure sensor and an air storage tank of the air compressor in parallel through a pipeline. According to the utility model, the probability of thread slipping does not exist, convenience is brought to detection personnel, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to an air tightness detection device for automobile brakes. Background Art

[0002] Automobile brakes are a very important safety component on a vehicle. When they are working, after the driver steps on the brake pedal, hydraulic oil enters the interior through the oil inlet hole, and the brake piston pushes the brake pad to move and clamp the vehicle brake disc, and then the wheel stops moving. During the production or maintenance of automobile brakes, the airtightness of the seals of their hydraulic cylinders (such as between the piston and the cylinder, etc.) needs to be tested. Specifically, during the test, the tester inserts the front end of the quick-connect connector connected to the air tank via a high-pressure hose into the oil inlet hole of the brake (a tee is installed at the rear end of the quick-connect plug, and the second and third ends of the tee are respectively connected to a connecting pipe. The first connecting pipe is connected to the air tank via a high-pressure hose, and the other connecting pipe is connected to the intake pipe of the pressure sensor via a pipe joint). Then, the valve of the air tank is opened, and the valve is closed after the gas enters the brake (in actual testing in the industry, two air pressures of 16Mpa and 1.3Mpa are generally required for testing respectively); after a period of time, by observing the air pressure data of the pressure sensor, if the air pressure data does not drop or drops very low, it means that the sealing performance of the brake seal is qualified; otherwise, the sealing performance of the brake seal is unqualified.

[0003] While existing quick-connect connectors, inserted into the brake's oil inlet, meet testing requirements to a certain extent, they require multiple turns of the quick-connect connector when disassembling and assembling before and after testing. This can be inconvenient for testers and, consequently, can lead to relatively low efficiency during batch testing. Furthermore, with threaded connections, operational errors, such as misalignment of the threaded end, can cause the quick-connect connector or the brake's oil inlet thread to slip. Furthermore, if the quick-connect connector is not rotated to its dead center, there's a chance that gas can leak into the brake, adversely affecting testing. Utility Model Content

[0004] In order to overcome the disadvantages of existing vehicle brakes, which use quick-connect connectors to connect the oil inlet holes of the brakes due to structural limitations, as described in the background, the present invention provides an air tightness testing device for vehicle brakes that, under the joint action of relevant mechanisms, can automatically seal and tighten the brake after the inspector places the vehicle brake at the inspection station, and allows the high-pressure compressed air output by the air compressor to enter the brake to test its sealing performance. Since there is no need for manual disassembly of connecting parts and there is no chance of thread stripping, it brings convenience to the inspector and improves the testing efficiency.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An air tightness detection device for automobile brakes, comprising an air compressor, a cylinder, a base plate, a front support column, a cross beam, a support beam, a rear support column, and a pressure sensor, characterized in that it also comprises a pressure head mechanism; the front support columns are multiple, and the lower ends of the multiple front support columns are respectively mounted at the front end of the base plate at a distance; there are at least two support beams, and the lower ends of the two support beams are respectively mounted on both sides of the base plate, and the rear support column is mounted on the rear end of the base plate; the two side ends of the cross beam are respectively mounted on the upper ends of the two support beams, the lower end of the cylinder body is mounted on the upper end of the cross beam, and the piston rod of the cylinder is located at the lower part of the cross beam; the pressure head mechanism comprises A connecting seat, a pressure head, and a sealing ring. A threaded tube is installed on the upper end of the connecting seat, a threaded groove is provided at the lower end of the piston rod of the cylinder, the connecting seat and the fixed groove are connected together through threads, a connecting pipe is provided at the lower end of the connecting seat, a positioning groove is provided on the lower outer side of the connecting pipe, the pressure head is a hollow structure, and an installation groove is provided at the inner end, the outer side of the sealing ring is installed in the installation groove, and the outer side of the pressure head is installed in the positioning groove; a connecting pipe is provided at the side end of the connecting pipe, the outer end of the connecting pipe and the intake pipe of the pressure sensor and the air tank of the air compressor are connected in parallel through pipelines, and the intake and exhaust pipes of the intake and exhaust valves at the upper and lower ends of the cylinder barrel of the cylinder and the air tank are connected in parallel through pipelines.

[0007] Furthermore, the pressure head is made of nylon, and the lower end is a planar structure and is in the same plane as the lower end of the connecting pipe. The outer diameter of the pressure head is larger than the outer diameter of the oil inlet hole of the brake.

[0008] Furthermore, the upper end of the front support column is provided with an arc-shaped concave limiting groove, and the upper end of the rear support column is an upward convex semicircular arc-shaped fixed position.

[0009] Furthermore, the spacing between two of the front support columns is consistent with the spacing between the two side ends of the fixing seats on both sides of the brake, and the upper end shape of multiple front support columns is consistent with the shape of the middle part of the brake and the lower outer end of the fixing seat, and the upper end shape of the rear support column is consistent with the rear upper end shape of the brake.

[0010] Furthermore, the inner side of the sealing ring and the inner side of the positioning groove, and the outer side of the sealing ring and the inner side of the installation groove are in an interference fit structure.

[0011] Compared with the prior art, the present invention has the following beneficial effects: after the tester places the automobile brake on the test station, the front support column and the rear support column can fix the brake housing. After opening the inlet and exhaust valves at the upper end of the cylinder, the piston rod of the cylinder drives the pressure head mechanism downward, fixing the brake at the test station. After opening the valve connected to the connecting pipe, the high-pressure compressed air output by the air compressor can enter the brake to test its sealing performance. After a period of time, the staff observes the air pressure data of the pressure sensor. If the air pressure data does not drop or drops very low, it means that the sealing performance of the brake seal is qualified. Otherwise, the sealing performance of the brake seal is unqualified. Since the present invention does not require manual disassembly and assembly of connectors and there is no chance of thread stripping, it brings convenience to the tester and improves the testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 It is a schematic diagram of the structure between the utility model as a whole and the brake.

[0014] Figure 2 This is a schematic structural diagram of the utility model.

[0015] Figure 3 It is a schematic diagram of the partial cross-sectional structure of the utility model. DETAILED DESCRIPTION

[0016] Figure 1 、 2As shown in FIG3 , an air tightness detection device for automobile brakes includes an air compressor (not shown), a cylinder 1, a base plate 2, front support columns 31 and 32, a crossbeam 4, a support beam 5, a rear support column 6, a pressure sensor (not shown), and a pressure head mechanism 7; there are three front support columns 31 and 32, and the lower ends of the three front support columns 31 and 32 are welded to the middle of the front end of the base plate 2 at a distance from left to right. There are two support beams 5, and the lower ends of the two support beams 5 are welded On both sides of the front end of the base plate 2, the lower ends of the rear support columns are welded to the middle of the rear end of the base plate 2; the lower ends of the left and right ends of the cross beam 4 are respectively welded to the upper ends of the two support beams 5, and there is an opening in the middle of the cross beam 4, and a plurality of screw holes are distributed in a ring on the side ends of the opening. The lower end of the cylinder 1 is screwed into the screw hole and installed in the middle of the upper end of the cross beam 4, and the piston rod of the cylinder 1 is led out to the lower end through the opening; the pressure head mechanism includes a connecting seat 71, a pressure head 72, an O-ring 73, and the upper end of the connecting seat 71 is welded There is an external threaded tube 711, the lower end of the piston rod of the cylinder 1 has a concave cylindrical internal thread fixing groove 101, the upper end of the connecting seat 71 and the fixing groove 101 are connected by threads, and the middle part of the lower end of the connecting seat 71 has a concave connecting pipe 74, and a circle of concave annular positioning groove 75 is located on the lower outer side of the connecting pipe 74. The pressure head 72 is a hollow annular structure and has a circle of mounting groove 721 on the inner end. The inner side of the sealing ring 73 is tightly sealed in the mounting groove 721, and the outer side of the pressure head 71 is tightly sealed. In the positioning groove 75; a connecting pipe 76 that communicates with the interior of the connecting pipe 74 is welded to the rear end of the connecting pipe 74, and the outer end of the connecting pipe 76 is connected to the first end of the tee pipe (not shown in the figure) through a threaded connection, the second end of the tee pipe is connected to the intake pipe of the pressure sensor through a pipe joint, the third end of the tee pipe is connected to the exhaust pipe valve of the air storage tank of the air compressor through a pipe, and the intake and exhaust pipes of the electromagnetic intake and exhaust valves (not shown in the figure) at the upper and lower ends of the cylinder barrel of the cylinder 1 and the exhaust pipe of the air storage tank are connected in parallel through pipes.

[0017] Figure 1 、 2 As shown in Figures 3 and 4, the pressure head 72 is made of nylon, and its lower end is a flat structure and is in the same plane as the lower end of the connecting pipe 74. The outer diameter of the pressure head 72 is larger than the outer diameter of the oil inlet hole 81 of the brake 8. The upper ends of the front support columns 31 and 32 are provided with arc-shaped concave limit grooves 33, and the upper end of the rear support column 6 is an upward convex semicircular fixed position 61. The spacing between the left and right front support columns 31 is consistent with the spacing between the two ends of the fixing seat 81 on both sides of the brake, and the upper end shape of the three front support columns 31 and 32 is consistent with the shape of the middle part of the brake 8 and the lower outer end of the fixing seat. The upper end shape of the rear support column 6 is consistent with the rear upper end shape of the brake 8. The inner side of the sealing ring 73 and the inner side of the positioning groove 75, and the outer side of the sealing ring and the inner side of the mounting groove 721 are in an interference fit structure.

[0018] Figure 1 、 2As shown in Figures 3 and 4, after the inspector places the automobile brake 8 at the inspection station, the front support columns 31 and 32 and the rear support column 6 can limit and fix the outer shell of the brake 8. After opening the inlet and exhaust valves at the upper end of the cylinder 1, the highly compressed air in the air tank of the air compressor enters the upper end of the cylinder 1 through the air inlet of the inlet and exhaust valves at the upper end of the cylinder 1 (the air at the lower end of the cylinder is discharged through the exhaust of the lower inlet and exhaust valves). The piston rod of the cylinder 1 pushes the pressure head 72 downward. When the lower end of the pressure head 72 contacts the upper end of the brake oil inlet hole 81, the pressure head 72 stops moving. In this way, the connecting pipe 73 and the oil inlet hole are interconnected. After the inspector opens the exhaust pipe valve connected to the connecting pipe 76, the high-pressure compressed air output by the air compressor enters the brake 8, thereby testing its sealing performance. After a period of time, the staff observes the air pressure data of the pressure sensor. If the air pressure data does not drop or drops very low, it means that the sealing performance of the brake seal is qualified. Otherwise, the sealing performance of the brake seal is unqualified. After the test is completed, the inlet and exhaust valves at the upper end of cylinder 1 are closed, and the inlet and exhaust valves at the lower end of cylinder 1 are opened. The highly compressed air in the air tank of the air compressor enters the lower end of the cylinder body of cylinder 1 through the air inlet of the inlet and exhaust valves at the lower end of cylinder 1 (the air at the upper end of the cylinder body is discharged through the exhaust port of the inlet and exhaust valves at the upper end). The piston rod of cylinder 1 pushes the pressure head 72 upward. When the upper end of the pressure head 72 is spaced from the upper end of the oil inlet hole 81 of the brake, the pressure head 72 stops moving and the distance between the pressure head 72 and the upper end of the brake is increased. In this way, the tester can remove the brake 8 after the test. Since this new type does not require manual disassembly of the connector and there is no chance of thread stripping, it brings convenience to the tester and improves the test efficiency.

[0019] Those skilled in the art should understand that although this specification is described in terms of implementation methods, the implementation methods do not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art. Therefore, the scope of protection of this application is defined by the claims.

Claims

1. An air tightness detection device for automobile brakes, comprising an air compressor, a cylinder, a base plate, a front support column, a crossbeam, a support beam, a rear support column, and a pressure sensor, characterized in that: It also has a pressure head mechanism; there are multiple front support columns, and the lower ends of the multiple front support columns are respectively installed at the front end of the base plate at a distance, there are at least two support beams, the lower ends of the two support beams are respectively installed on both sides of the base plate, and the rear support column is installed at the rear end of the base plate; the two side ends of the cross beam are respectively installed on the upper ends of the two support beams, the lower end of the cylinder body is installed on the upper end of the cross beam, and the piston rod of the cylinder is located at the lower part of the cross beam; the pressure head mechanism includes a connecting seat, a pressure head, and a sealing ring. The upper end of the connecting seat is installed with a threaded tube, and the movable end of the cylinder is installed at the bottom of the cross beam. There is a threaded groove at the lower end of the plug rod, and the connecting seat and the fixing groove are connected together through threads. There is a connecting pipe at the lower end of the connecting seat, and a positioning groove is provided on the lower outer side of the connecting pipe. The pressure head is a hollow structure and has a mounting groove at the inner end. The outer side of the sealing ring is installed in the mounting groove, and the outer side of the pressure head is installed in the positioning groove; there is a connecting pipe at the side end of the connecting pipe, and the outer end of the connecting pipe is connected in parallel with the air intake pipe of the pressure sensor and the air storage tank of the air compressor through a pipeline, and the air intake and exhaust pipes of the air intake and exhaust valves at the upper and lower ends of the cylinder barrel of the cylinder and the air storage tank are connected in parallel through a pipeline.

2. The air tightness detection device for automobile brakes according to claim 1, characterized in that: The pressure head is made of nylon, and the lower end is a flat structure and is in the same plane as the lower end of the connecting pipe. The outer diameter of the pressure head is larger than the outer diameter of the oil inlet hole of the brake.

3. The air tightness detection device for automobile brakes according to claim 1, characterized in that: The upper end of the front support column is provided with an arc-shaped concave limiting groove, and the upper end of the rear support column is an upward convex semicircular arc fixed position.

4. The air tightness detection device for automobile brakes according to claim 1, characterized in that: The distance between the two front support columns is consistent with the distance between the two sides of the fixing seats on both sides of the brake, and the upper end shape of multiple front support columns is consistent with the shape of the middle part of the brake and the lower outer end of the fixing seat, and the upper end shape of the rear support column is consistent with the rear upper end shape of the brake.

5. The air tightness detection device for automobile brakes according to claim 1, characterized in that: The inner side of the sealing ring and the inner side of the positioning groove, as well as the outer side of the sealing ring and the inner side of the installation groove are in an interference fit structure.

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