An automatic detection device for automobile brake pipe joints

Abstract

The invention relates to the technical field of automobile brake pipe joint detection, and discloses an automobile brake pipe joint automatic detection device, comprising a workbench, a T-shaped embedding groove for placing the brake pipe joint is opened on the workbench, and the brake pipe joint is provided with a first joint port, a second joint port and a third joint port, wherein the first joint port and the second joint port are coaxial; a docking mechanism and an air supply mechanism are arranged on the workbench, the docking mechanism comprises three first connecting pipes and three second connecting pipes, and the air supply mechanism comprises an air pump and a three-way valve assembly arranged on the workbench; the three first connecting pipes are respectively connected to the first joint port, the second joint port and the third joint port; the automobile brake pipe joint automatic detection device has the function of automatically detecting the air tightness of the three passages of the brake pipe joint, so that when an air tightness problem occurs, the defective passage can be specifically identified.

Description

Technical Field

[0001] The invention relates to the technical field of automobile brake pipe joint detection, in particular to an automobile brake pipe joint automatic detection device. Background Art

[0002] ‌Brake pipe joints are used to connect the hose and the hard pipe or other components in the brake system to ensure the normal operation of the brake system. Brake pipe joints are usually T-shaped three-way pipes. During the processing of brake pipe joints, the air tightness of the product needs to be tested.

[0003] In the prior art, the equipment for testing the air tightness of the brake pipe joint usually only ventilates the three ports of the brake pipe joint and tests the overall air tightness of the brake pipe joint, but cannot specifically identify which passage of the brake pipe joint is defective.

[0004] Therefore, in order to solve the above technical problems existing in the prior art, an automatic detection device for automobile brake pipe joints is proposed. Summary of the invention

[0005] The present invention provides an automated testing device for automobile brake pipe joints, which has the function of automatically testing the air tightness of three passages of the brake pipe joint respectively, thereby having the beneficial effect of specifically checking the defective passage when an air tightness problem occurs. It solves the problem that in the prior art mentioned in the above background technology, the equipment for testing the air tightness of the brake pipe joint usually only ventilates the three ports of the brake pipe joint and tests the overall air tightness of the brake pipe joint, but cannot specifically check which passage of the brake pipe joint is defective.

[0006] The present invention provides the following technical solution: an automatic detection device for automobile brake pipe joints, comprising a workbench, the workbench is provided with a T-shaped embedding groove for placing a brake pipe joint, the brake pipe joint is provided with a first joint port, a second joint port and a third joint port, wherein the first joint port and the second joint port are coaxial;

[0007] The workbench is provided with a docking mechanism and an air supply mechanism, the docking mechanism includes three first connecting pipes and three second connecting pipes, and the air supply mechanism includes an air pump and a three-way valve assembly arranged on the workbench;

[0008] The three first connecting pipes are respectively connected to the first joint port, the second joint port and the third joint port, the three first connecting pipes are respectively connected to the three second connecting pipes, the three second connecting pipes are all connected to the three-way valve assembly, and the three second connecting pipes are all provided with flow meters;

[0009] After the first connector port, the second connector port and the third connector port are connected in pairs in sequence to form three passages through the three-way valve assembly, air is supplied to the three passages respectively through the air pump, and then the air tightness of the three passages is detected by the three flow meters.

[0010] As an optional solution of the automatic detection device for automobile brake pipe joints of the present invention, wherein: the three-way valve assembly includes a three-way valve seat, and the three-way valve seat is provided with a first valve port, a second valve port and a third valve port, the first valve port is communicated with the first joint port, the second valve port is communicated with the second joint port, and the third valve port is communicated with the third joint port;

[0011] A three-way valve core is rotatably arranged on the three-way valve seat, an air passage is opened on the three-way valve core, a motor is arranged on the workbench, and an output shaft of the motor is connected to the three-way valve core.

[0012] As an optional solution of the automatic detection device for automobile brake pipe joints of the present invention, wherein: the air supply mechanism further includes a connecting component, the connecting component includes a fourth connecting pipe arranged on the workbench, and the fourth connecting pipe is connected to the air pump;

[0013] The fourth connecting pipeline is provided with a first pipeline port and a second pipeline port, the first pipeline port is communicated with the first valve port, and the second pipeline port is communicated with the second valve port.

[0014] As an optional solution of the automatic detection device for automobile brake pipe joints described in the present invention, the fourth connecting pipe is also provided with a third pipe port, the third pipe port is connected with the third valve port, the first pipe port, the second pipe port and the third pipe port are all provided with solenoid valves and one-way valves, and the one-way valve is used to limit the one-way flow of air from the air pump to the three second connecting pipes.

[0015] As an optional solution of the automatic detection device for automobile brake pipe joints of the present invention, wherein: the docking mechanism also includes three bellows and three third connecting pipes, the three first connecting pipes are respectively rotatably connected to the three third connecting pipes, and the three third connecting pipes are respectively connected to the three second connecting pipes through the three bellows;

[0016] The first joint port, the second joint port and the third joint port are all provided with internal threads, and the three first connecting pipes are all provided with external threads, and the external threads are adapted to the internal threads.

[0017] As an optional solution of the automatic detection device for automobile brake pipe joints of the present invention, wherein: the docking mechanism also includes an installation component, and the installation component is used to thread the three first connecting pipes into the first joint port, the second joint port and the third joint port respectively;

[0018] The mounting assembly includes three movable seats, the three first connecting pipes are rotatably connected to the three movable seats respectively, a cylinder is arranged on the workbench, a lifting plate is arranged on the piston rod of the cylinder, three first connecting seats are arranged on the lifting plate, and second connecting seats are arranged on the three movable seats;

[0019] The installation assembly also includes three connecting rods, one end of the three connecting rods is movably hinged to the three first connecting seats through hinge shafts, and the other end of the three connecting rods is movably hinged to the three second connecting seats through hinge shafts.

[0020] As an optional solution of the automatic detection device for automobile brake pipe joints of the present invention, wherein: three fixing seats are arranged on the workbench, and the three third connecting pipes are slidably connected to the three fixing seats respectively;

[0021] The three fixing seats are each provided with a spiral groove, the pitch and number of turns of the spiral groove are consistent with the internal thread, and the three first connecting pipes are each provided with a slider, and the three sliders are respectively slidably connected in the three spiral grooves.

[0022] As an optional solution of the automatic detection device for automobile brake pipe joints of the present invention, the docking mechanism further includes three blocking components, which are used to block the other two passages when one of the passages is connected;

[0023] The blocking component includes a valve stem, which is arranged in the first connecting pipe. A valve groove is formed on the first connecting pipe, and the valve stem is adapted to the valve groove.

[0024] As an optional solution of the automatic detection device for automobile brake pipe joints of the present invention, wherein: a first slide groove is provided on the first connecting pipe, a slide plate is slidably arranged in the first slide groove, and the valve stem is connected to the slide plate;

[0025] A second slide groove is provided on the movable seat, a slide seat is slidably arranged in the second slide groove, the slide plate is rotatably connected in the slide seat, and the slide seat is elastically connected to the movable seat through a spring;

[0026] A push rod is arranged on the valve core of the three-way valve.

[0027] As an optional solution of the automatic detection device for automobile brake pipe joints described in the present invention, a sealing groove is also provided on the first connecting pipe, the sealing groove is connected to the first sliding groove, a sealing plate is slidably arranged in the sealing groove, and the sliding plate is connected to the sealing plate.

[0028] The present invention has the following beneficial effects:

[0029] 1. The automatic detection device for automobile brake pipe joints can automatically connect three connecting pipes with the three ports of the brake pipe joints, and then control one of the passages of the brake pipe joints to be connected through the three-way valve assembly, and then introduce a circulating airflow into the passage, and judge whether the air tightness of the passage is intact by detecting the flow rate of the airflow at both ends of the passage. Then switch to the remaining two passages for air tightness detection, so that the three passages of the brake pipe joints can be individually tested for air tightness to identify the location of air tightness defects. And when the circulating airflow is introduced, the direction of the airflow can be changed, so as to avoid missing some air tightness defects that are only exposed under unidirectional airflow.

[0030] 2. The automatic detection device for automobile brake pipe joints is used to simulate the actual working conditions of the brake pipe joints in the automobile brake system. When the three ports of the brake pipe joints are connected, the three connecting pipes are threadedly installed on the three ports of the brake pipe joints in three directions respectively under the drive of the installation assembly. Then, by installing a sealing ring on the first connecting pipe, a good sealing performance between the connecting pipe and the brake pipe joint can be ensured.

[0031] 3. The automatic detection device for automobile brake pipe joints, when the three-way valve core of the three-way valve assembly that controls the switching of the three passages of the brake pipe joint rotates, will also drive the push rod to rotate to block the two passages that are not involved in the air tightness detection at this time, thereby improving the accuracy of the air tightness detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0033] Figure 2 It is a first cross-sectional structural schematic diagram of the present invention.

[0034] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0035] Figure 4 It is a second cross-sectional structural schematic diagram of the present invention.

[0036] Figure 5 for Figure 4 A partial enlarged view of point B in the middle.

[0037] Figure 6 for Figure 4 A partial enlarged view of point C in the middle.

[0038] Figure 7 for Figure 4 A partial enlarged view of point D in the middle.

[0039] Figure 8 It is a schematic diagram of the first explosion structure of the present invention.

[0040] Fig. 9 It is a schematic diagram of the second explosion structure of the present invention.

[0041] Fig.10 It is a schematic diagram of the third explosion structure of the present invention.

[0042] In the figure: 100, brake pipe joint; 110, first joint port; 120, second joint port; 130, third joint port; 140, internal thread; 200, workbench; 210, T-shaped embedded groove; 300, docking mechanism; 310, first connecting pipe; 320, second connecting pipe; 330, bellows; 340, third connecting pipe; 350, external thread; 360, mounting assembly; 361, movable seat; 362, cylinder; 363, lifting plate; 364, first connecting seat; 365, second connecting seat; 366, connecting rod; 367, fixed seat; 368, spiral groove; 369, slider; 370, plugging assembly; 371, valve stem; 372, valve slot; 373, first slide slot; 374, slide plate; 375, second slide slot; 376, slide seat; 377, spring; 378, sealing plate; 379, sealing slot; 400, air supply mechanism; 410, air pump; 420, three-way valve assembly; 421, three-way valve seat; 422, first valve port; 423, second valve port; 424, third valve port; 425, three-way valve core; 426, airway; 427, motor; 430, connecting assembly; 431, fourth connecting pipeline; 432, first pipeline port; 433, second pipeline port; 434, third pipeline port; 435, solenoid valve; 436, one-way valve; 440, push rod; 500, flow meter. DETAILED DESCRIPTION

[0043] 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.

[0044] For example, see Figure 1-Figure 8, an automatic detection device for automobile brake pipe joints, comprising a workbench 200, on which a T-shaped embedding groove 210 for placing a brake pipe joint 100 is opened, and the brake pipe joint 100 is provided with a first joint port 110, a second joint port 120 and a third joint port 130, wherein the first joint port 110 and the second joint port 120 are coaxial;

[0045] The workbench 200 is provided with a docking mechanism 300 and an air supply mechanism 400, the docking mechanism 300 includes three first connecting pipes 310 and three second connecting pipes 320, and the air supply mechanism 400 includes an air pump 410 and a three-way valve assembly 420 provided on the workbench 200;

[0046] The three first connecting pipes 310 are respectively connected to the first joint port 110, the second joint port 120 and the third joint port 130, the three first connecting pipes 310 are respectively connected to the three second connecting pipes 320, the three second connecting pipes 320 are all connected to the three-way valve assembly 420, and the three second connecting pipes 320 are all provided with a flow meter 500;

[0047] After the first connector port 110, the second connector port 120 and the third connector port 130 are connected in pairs in sequence to form three passages through the three-way valve assembly 420, air is supplied to the three passages respectively through the air pump 410, and then the air tightness of the three passages is detected by three flow meters 500.

[0048] In this embodiment: first, the brake pipe joint 100 is embedded in the T-shaped embedding groove 210 to play a certain fixing role and prevent the brake pipe joint 100 from shifting during the air tightness test. The brake pipe joint 100 is placed in a T shape, the left port is set as the first joint port 110, the right port is set as the second joint port 120, and the front port is set as the third joint port 130. There are three passages in the brake pipe joint 100, namely the first joint port 110 and the third joint port 130, the second joint port 120 and the third joint port 130, and the first joint port 110 and the second joint port 120.

[0049] The docking mechanism 300 drives the three first connecting pipes 310 to be automatically inserted into the first connector port 110 , the second connector port 120 and the third connector port 130 , respectively, so that the first connector port 110 , the second connector port 120 and the third connector port 130 are all connected to the three-way valve assembly 420 .

[0050] When testing the passage between the first connector port 110 and the third connector port 130, the three-way valve assembly 420 controls the passage between the first connector port 110 and the third connector port 130 to be opened, and at this time, the passage between the first connector port 110 and the second connector port 120, and the passage between the second connector port 120 and the third connector port 130 are all closed. Then, the gas is ventilated, so that the gas flows from the three-way valve assembly 420 through the second connecting pipe 320 and the first connecting pipe 310 on the left side to the first connector port 110, and then flows out from the third connector port 130 through the first connecting pipe 310 and the second connecting pipe 320 on the front side. By detecting the flow rate of the airflow at both ends by the flow meter 500 installed in the two second connecting pipes 320, and comparing them, it can be determined whether there is leakage in the passage between the first connector port 110 and the third connector port 130.

[0051] Similarly, the air tightness detection is performed on the passage between the second joint port 120 and the third joint port 130, the first joint port 110 and the second joint port 120, the second joint port 120 and the third joint port 130, and the first joint port 110 and the second joint port 120, respectively, so as to determine the air leakage location.

[0052] Embodiment 2: This embodiment is an improvement on Embodiment 1. For details, please refer to Figure 1-Figure 9 The three-way valve assembly 420 includes a three-way valve seat 421, on which a first valve port 422, a second valve port 423 and a third valve port 424 are provided, the first valve port 422 is communicated with the first connector port 110, the second valve port 423 is communicated with the second connector port 120, and the third valve port 424 is communicated with the third connector port 130;

[0053] A three-way valve core 425 is rotatably disposed on the three-way valve seat 421, an air passage 426 is provided on the three-way valve core 425, a motor 427 is disposed on the workbench 200, and an output shaft of the motor 427 is connected to the three-way valve core 425;

[0054] The air supply mechanism 400 further includes a connecting component 430, and the connecting component 430 includes a fourth connecting pipe 431 disposed on the workbench 200, and the fourth connecting pipe 431 is connected to the air pump 410;

[0055] The fourth connecting pipe 431 is provided with a first pipe port 432 and a second pipe port 433 , the first pipe port 432 is in communication with the first valve port 422 , and the second pipe port 433 is in communication with the second valve port 423 ;

[0056] A third pipeline port 434 is also provided on the fourth connecting pipeline 431, and the third pipeline port 434 is connected to the third valve port 424. The first pipeline port 432, the second pipeline port 433 and the third pipeline port 434 are all provided with a solenoid valve 435 and a one-way valve 436. The one-way valve 436 is used to limit the one-way flow of air from the air pump 410 to the three second connecting pipelines 320.

[0057] In this embodiment, when the passage between the first connector port 110 and the third connector port 130 is detected, the motor 427 controls the three-way valve core 425 to rotate to Figure 3 At this time, the two ends of the air passage 426 at an angle of 240° on the three-way valve core 425 are respectively aligned with the first valve port 422 and the third valve port 424 , while the passage between the second valve port 423 and the first valve port 422 and the third valve port 424 is blocked by the three-way valve core 425 .

[0058] At this time, the air pump 410 ventilates the fourth connecting pipe 431, and the electromagnetic valve 435 on the left side of the fourth connecting pipe 431 is opened, while the electromagnetic valve 435 on the right side and the front side is closed. The airflow enters the second connecting pipe 320 on the left side through the electromagnetic valve 435 and the one-way valve 436 on the left side, and then passes through the first connecting pipe 310 on the left side to reach the first joint port 110, and then enters the third joint port 130, flows out from the first connecting pipe 310 on the front side, enters the second connecting pipe 320 on the front side, and then enters the third valve port 424, and circulates back to the first valve port 422 through the air passage 426, forming a circulating airflow.

[0059] The second connecting pipe 320 on the front side is also provided with a third pipe port 434, a solenoid valve 435 and a one-way valve 436. The purpose is that some airtight defects may not be apparent in the airflow in one direction, but leakage will occur when switching to another flow direction.

[0060] Therefore, after the airflow circulates from the first valve port 422 to the third valve port 424, the left electromagnetic valve 435 is switched closed and the front electromagnetic valve 435 is opened. At this time, the airflow circulates from the third valve port 424 to the first valve port 422. Then, the airtightness test is performed.

[0061] After the detection of the passage between the first connector port 110 and the third connector port 130 is completed, the motor 427 controls the three-way valve core 425 to rotate 120° counterclockwise to switch to detecting the passage between the second connector port 120 and the third connector port 130. The detection process is the same as above. Then the passage between the first connector port 110 and the second connector port 120 is detected again.

[0062] Embodiment 3: This embodiment is an improvement made on the basis of Embodiment 1. For details, please refer to Figure 1-Figure 10 The docking mechanism 300 further includes three bellows 330 and three third connecting pipes 340. The three first connecting pipes 310 are rotatably connected to the three third connecting pipes 340 respectively. The three third connecting pipes 340 are connected to the three second connecting pipes 320 respectively through the three bellows 330.

[0063] The first joint port 110 , the second joint port 120 and the third joint port 130 are all provided with internal threads 140 , and the three first connecting pipes 310 are all provided with external threads 350 , which are adapted to the internal threads 140 ;

[0064] The docking mechanism 300 further includes an installation assembly 360, which is used to thread the three first connection pipes 310 into the first joint port 110, the second joint port 120 and the third joint port 130 respectively;

[0065] The mounting assembly 360 includes three movable seats 361, and the three first connecting pipes 310 are rotatably connected to the three movable seats 361 respectively. A cylinder 362 is provided on the workbench 200, and a lifting plate 363 is provided on the piston rod of the cylinder 362. The lifting plate 363 is provided with three first connecting seats 364, and the three movable seats 361 are each provided with a second connecting seat 365;

[0066] The mounting assembly 360 further includes three connecting rods 366, one end of each of the three connecting rods 366 is movably hinged to the three first connecting seats 364 through hinge shafts, and the other end of each of the three connecting rods 366 is movably hinged to the three second connecting seats 365 through hinge shafts.

[0067] Three fixing seats 367 are provided on the workbench 200, and the three third connecting pipes 340 are slidably connected in the three fixing seats 367 respectively;

[0068] A spiral groove 368 is provided in each of the three fixing seats 367 , and the pitch and number of turns of the spiral groove 368 are consistent with the internal thread 140 . A slider 369 is provided on each of the three first connecting pipes 310 , and the three sliders 369 are slidably connected in the three spiral grooves 368 , respectively.

[0069] In this embodiment, in order to simulate the actual working condition of the brake pipe joint 100, the first joint port 110, the second joint port 120 and the third joint port 130 are connected to the pipeline of the automobile brake system through threads. Therefore, three first connecting pipes 310 are provided with external threads 350.

[0070] After the brake pipe joint 100 is placed in the T-shaped groove 210, the cylinder 362 controls the lifting plate 363 and the three first connecting seats 364 to move upward, and the three second connecting seats 365 and the three movable seats 361 are driven by the three connecting rods 366 to move toward the brake pipe joint 100 respectively.

[0071] by Figure 6 and Figure 7 Taking the first connecting pipe 310 located at the front side as an example, the second connecting seat 365 and the movable seat 361 in the figure move backward, driving the first connecting pipe 310 to move forward, but does not affect the rotation of the first connecting pipe 310, because the slider 369 slides along the spiral groove 368, and the pitch and number of turns of the spiral groove 368 and the internal thread 140 are consistent. Therefore, the first connecting pipe 310 is threadedly moved backward, so that the first connecting pipe 310 is threadedly installed on the third joint port 130. A sealing ring can be installed on the first connecting pipe 310 to further enhance the sealing performance.

[0072] The first connecting pipe 310 is rotatably installed on the third connecting pipe 340, and the third connecting pipe 340 is supported by the fixing seat 367. The third connecting pipe 340 does not rotate but moves backward with the first connecting pipe 310. When the third connecting pipe 340 moves backward, the bellows 330 extends to keep the third connecting pipe 340 connected to the second connecting pipe 320.

[0073] After the inspection is completed, during disassembly, the cylinder 362 moves downward, so that the first connecting pipe 310 is spirally disengaged from the third joint port 130, and the brake pipe joint 100 can be removed.

[0074] Embodiment 4: This embodiment is an improvement on Embodiment 3. For details, please refer to Figure 1-Figure 10 The docking mechanism 300 further includes three blocking components 370, which are used to block the other two passages when one of the passages is connected;

[0075] The plugging assembly 370 includes a valve stem 371, which is disposed in the first connecting pipe 310. A valve groove 372 is formed on the first connecting pipe 310, and the valve stem 371 is adapted to fit the valve groove 372.

[0076] The first connecting pipe 310 is provided with a first slide groove 373, a slide plate 374 is slidably disposed in the first slide groove 373, and the valve stem 371 is connected to the slide plate 374;

[0077] The movable seat 361 is provided with a second slide groove 375, a slide seat 376 is slidably arranged in the second slide groove 375, the slide plate 374 is rotatably connected in the slide seat 376, and the slide seat 376 is elastically connected to the movable seat 361 through a spring 377;

[0078] A push rod 440 is provided on the three-way valve core 425;

[0079] The first connecting pipe 310 is further provided with a sealing groove 379 , which is communicated with the first sliding groove 373 . A sealing plate 378 is slidably disposed in the sealing groove 379 , and the sliding plate 374 is connected to the sealing plate 378 .

[0080] In this embodiment, taking the detection of the passage between the first joint port 110 and the second joint port 120 as an example, the accuracy of the airtightness detection is ensured by blocking the third joint port 130 .

[0081] At this time, the motor 427 controls the three-way valve core 425 to rotate, so that the three-way valve core 425 blocks the third valve port 424. At this time, the push rod 440 rotates to the front side along with the three-way valve core 425. The N-shaped front end of the push rod 440 pushes Figure 7 The front end is configured as a semicircular slide seat 376 so that the slide seat 376 moves backwards against the elastic force of the spring 377 .

[0082] At this time, the sliding seat 376 drives the sliding plate 374 and the valve stem 371 to move backward, and the valve stem 371 is inserted into the valve groove 372 to block the third joint port 130 .

[0083] The push rod 440 passes through the front part of the fourth connecting pipe 431 . During the entire detection process, the push rod 440 only needs to rotate 240° along with the three-way valve core 425 , so the push rod 440 will not touch the cylinder 362 .

[0084] During this process, the slide seat 376 can drive the slide plate 374 to move forward and backward, but does not affect the slide plate 374 from rotating along the first connecting pipe 310. When the sealing plate 378 on the slide plate 374 moves forward and backward along the sealing groove 379 with a longer length, the sealing plate 378 will not be separated from the sealing groove 379, thereby ensuring the sealing performance of the first connecting pipe 310.

[0085] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0086] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automatic detection device for automobile brake pipe joints, comprising a workbench (200), characterized in that: The workbench (200) is provided with a T-shaped groove (210) for placing a brake pipe joint (100), and the brake pipe joint (100) is provided with a first joint port (110), a second joint port (120) and a third joint port (130), wherein the first joint port (110) and the second joint port (120) are coaxial; The workbench (200) is provided with a docking mechanism (300) and an air supply mechanism (400), the docking mechanism (300) comprising three first connecting pipes (310) and three second connecting pipes (320), and the air supply mechanism (400) comprising an air pump (410) and a three-way valve assembly (420) arranged on the workbench (200); The three first connecting pipes (310) are respectively connected to the first joint port (110), the second joint port (120) and the third joint port (130); the three first connecting pipes (310) are respectively connected to the three second connecting pipes (320); the three second connecting pipes (320) are all connected to the three-way valve assembly (420); and flow meters (500) are provided in the three second connecting pipes (320); After the three-way valve assembly (420) is used to control the first joint port (110), the second joint port (120) and the third joint port (130) to be connected in pairs in sequence to form three passages, the air pump (410) is used to supply air to the three passages respectively, and the air tightness of the three passages is then detected by the three flow meters (500); The three-way valve assembly (420) comprises a three-way valve seat (421), the three-way valve seat (421) being provided with a first valve port (422), a second valve port (423) and a third valve port (424), the first valve port (422) being in communication with the first connector port (110), the second valve port (423) being in communication with the second connector port (120), and the third valve port (424) being in communication with the third connector port (130); A three-way valve core (425) is rotatably arranged on the three-way valve seat (421), an air passage (426) is provided on the three-way valve core (425), a motor (427) is arranged on the workbench (200), and an output shaft of the motor (427) is connected to the three-way valve core (425); The air supply mechanism (400) further comprises a connecting component (430), wherein the connecting component (430) comprises a fourth connecting pipe (431) arranged on the workbench (200), and the fourth connecting pipe (431) is connected to the air pump (410); The fourth connecting pipe (431) is provided with a first pipe port (432) and a second pipe port (433), the first pipe port (432) being in communication with the first valve port (422), and the second pipe port (433) being in communication with the second valve port (423); The fourth connecting pipeline (431) is also provided with a third pipeline port (434), the third pipeline port (434) being in communication with the third valve port (424), the first pipeline port (432), the second pipeline port (433) and the third pipeline port (434) are each provided with a solenoid valve (435) and a one-way valve (436), the one-way valve (436) being used to limit the one-way flow of air from the air pump (410) to the three second connecting pipelines (320); The docking mechanism (300) further comprises three bellows (330) and three third connecting pipes (340); the three first connecting pipes (310) are respectively rotatably connected to the three third connecting pipes (340); and the three third connecting pipes (340) are respectively connected to the three second connecting pipes (320) via the three bellows (330); The first joint port (110), the second joint port (120) and the third joint port (130) are each provided with an internal thread (140), and the three first connecting pipes (310) are each provided with an external thread (350), and the external thread (350) is adapted to fit the internal thread (140).

2. The automatic detection device for automobile brake pipe joints according to claim 1 is characterized in that: The docking mechanism (300) further comprises an installation assembly (360), wherein the installation assembly (360) is used to threadably connect the three first connection pipes (310) to the first joint port (110), the second joint port (120), and the third joint port (130), respectively; The mounting assembly (360) comprises three movable seats (361), the three first connecting pipes (310) are rotatably connected to the three movable seats (361) respectively, a cylinder (362) is provided on the workbench (200), a lifting plate (363) is provided on the piston rod of the cylinder (362), three first connecting seats (364) are provided on the lifting plate (363), and the three movable seats (361) are each provided with a second connecting seat (365); The mounting assembly (360) further comprises three connecting rods (366), one end of the three connecting rods (366) being movably hinged to the three first connecting seats (364) via hinge shafts, and the other end of the three connecting rods (366) being movably hinged to the three second connecting seats (365) via hinge shafts.

3. The automatic detection device for automobile brake pipe joints according to claim 2 is characterized in that: Three fixing seats (367) are arranged on the workbench (200), and the three third connecting pipes (340) are slidably connected to the three fixing seats (367) respectively; The three fixing seats (367) are each provided with a spiral groove (368), the pitch and number of turns of the spiral groove (368) being consistent with the internal thread (140), and the three first connecting pipes (310) are each provided with a slider (369), and the three sliders (369) are respectively slidably connected to the three spiral grooves (368).

4. The automatic detection device for automobile brake pipe joints according to claim 2 is characterized in that: The docking mechanism (300) further comprises three blocking components (370), wherein the three blocking components (370) are used to block the other two passages when one of the passages is connected; The blocking component (370) comprises a valve stem (371), wherein the valve stem (371) is arranged in the first connecting pipe (310), a valve groove (372) is provided on the first connecting pipe (310), and the valve stem (371) is adapted to fit the valve groove (372).

5. The automatic detection device for automobile brake pipe joints according to claim 4 is characterized in that: The first connecting pipe (310) is provided with a first sliding groove (373), a sliding plate (374) is slidably arranged in the first sliding groove (373), and the valve stem (371) is connected to the sliding plate (374); The movable seat (361) is provided with a second slide groove (375), a slide seat (376) is slidably arranged in the second slide groove (375), the slide plate (374) is rotatably connected in the slide seat (376), and the slide seat (376) is elastically connected to the movable seat (361) via a spring (377); A push rod (440) is provided on the three-way valve core (425).

6. The automatic detection device for automobile brake pipe joints according to claim 5 is characterized in that: The first connecting pipe (310) is also provided with a sealing groove (379), the sealing groove (379) being in communication with the first sliding groove (373), a sealing plate (378) being slidably disposed in the sealing groove (379), and the sliding plate (374) being connected to the sealing plate (378).

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