Automobile brake pipe joint endurance fatigue test equipment

Abstract

An automobile brake pipe joint endurance fatigue test device belongs to the brake pipe interface performance test technology field. The test device comprises a test chamber, a servo motor is fixedly installed in the test chamber, an output shaft of the servo motor is fixedly connected with a rotating shaft, a fixed plate is fixedly connected in the test chamber, and a dynamic vibration mechanism is arranged at the end of the rotating shaft, so that when the brake pipe interface is tested, the dynamic vibration mechanism can vibrate at the same time. Working condition pressure of different vibration amplitudes can be applied to the brake pipe connector, and a transmission mechanism is arranged in the fixing plate so that vibration testing of the brake pipe connector can be automatically stopped when the brake pipe connector leaks under the limiting working condition. The rotary rod is adjusted by rotating the rotary knob, the sliding rods are driven to slide in the sliding grooves, the multiple sliding rods are far away from one another in the first limiting grooves, the rotating diameter of the cam is increased, the vibration amplitude of the brake pipe connector is adjusted, the test requirements of different brake pipes under various working conditions can be met, and the test flexibility and accuracy are improved.

Description

Technical Field

[0001] The invention relates to the technical field of brake pipe interface performance testing, in particular to a durable fatigue testing device for a connection of an automobile brake pipe. Background Art

[0002] The function of the automobile braking system is to slow down the car at an appropriate deceleration until it stops; when driving downhill, it keeps the car at an appropriate stable speed and allows the car to stop reliably in place or on the slope. As the speed of cars continues to increase, the requirements for automobile braking performance are also getting higher and higher. In addition to achieving good braking performance, the automobile braking system must also reduce the driver's workload as much as possible. Therefore, the power brake system has been widely used in automobiles.

[0003] During the driving process of the car, the brake pipe of the car will change with the turning and bumping of the car tires, and the frequency and amplitude of the turning and bumping have a great influence on the life of the car brake pipe. Therefore, before loading and running, the car brake pipe needs to be subjected to a durability test. When the general brake pipe durability test device is conducting the test, the parameters such as the frequency and amplitude of the test are fixed. Due to the turning and bumping of the car tires, the brake pipe will experience complex and changeable dynamic stresses. The frequency and amplitude of these dynamic stresses have a crucial impact on the life of the brake pipe, and thus it is impossible to solve the limit vibration frequency of the brake pipe when it leaks under different vibration amplitudes. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of the limit vibration frequency of the brake pipe when it leaks at different vibration amplitudes under working pressure, and to propose a durable fatigue test equipment for the connection of automobile brake pipes.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a durable fatigue test device for a connection of a brake pipe of an automobile, comprising a test chamber, a servo motor is fixedly installed inside the test chamber, and the output shaft of the servo motor is fixedly connected to a rotating shaft, and a fixing plate is fixedly connected inside the test chamber; The end of the rotating shaft is provided with a dynamic vibration mechanism so as to apply working pressures with different vibration amplitudes to the brake pipe interface when the brake pipe interface is tested; A transmission mechanism is arranged inside the fixing plate so as to automatically stop the vibration test on the brake pipe interface when the brake pipe interface leaks under extreme working conditions.

[0006] Further, the dynamic vibration mechanism includes a rotating plate, and a first through slot is formed through the side wall of the rotating plate, a first limiting rod is fixedly connected to the inside of the first through slot, and a first slider is slidably connected to the outer wall of the first limiting rod, a first spring is fixedly connected to the side wall of the first slider, and an end of the first spring away from the first slider is fixedly connected to the inner wall of the first through slot, a cam is fixedly connected to the outer wall of the first slider, and an extrusion block is fixedly connected to one end of the first slider.

[0007] Further, the inner wall of the test chamber is fixedly connected with a fixed cylinder, and one end of the fixed cylinder is fixedly connected with a connecting shell, a side wall of the connecting shell is penetrated with a first limiting groove, the interior of the connecting shell is rotatably connected with a turntable, and the side wall of the turntable is penetrated with a sliding groove, the inner wall of the sliding groove is rotatably connected with a sliding rod, and the outer wall of the sliding rod is slidably connected to the inner wall of the first limiting groove, the end of the sliding rod away from the sliding groove is fixedly connected with an extrusion plate, the side wall of the extrusion plate is fixedly connected with a rotating rod, and the outer wall of the rotating rod penetrates and is rotatably connected to the inner wall of the fixed cylinder, and the end of the rotating rod away from the turntable is fixedly connected with a knob.

[0008] Furthermore, the end of the rotating plate is fixedly connected to the end of the rotating shaft, the outer wall of the extrusion block slides in contact with the outer wall of the fixed cylinder, and the outer wall of the fixed cylinder penetrates and is rotatably connected to the interior of the test chamber.

[0009] Furthermore, the transmission mechanism includes a movable block, and a second through slot is penetrated through the side wall of the movable block, a second limiting rod is fixedly connected to the inner wall of the second through slot, and a second slider is fixedly connected to the outer wall of the second limiting rod, a second spring is fixedly connected to the top of the second slider, and an end of the second spring away from the second limiting rod is fixedly connected to the inner wall of the second through slot, a resist rod is slidably connected through the inner wall of the movable block, and an end of the second slider is fixedly connected to the outer wall of the resist rod.

[0010] Furthermore, a second limiting groove is provided inside the movable block, and the inner wall of the second limiting groove is slidably connected to a fixed block, a sealing cavity is provided inside the fixed block, and the inner wall of the sealing cavity is slidably connected to a sealing block, the outer wall of the sealing block is fixedly connected to the inner wall of the second limiting groove, a connecting pipe is provided inside the sealing block and is fixedly connected, and a groove is provided at the bottom of the movable block.

[0011] Furthermore, the outer wall of the movable block is slidably connected to the inside of the fixed plate, the side wall of the cam is slidably connected to the side wall of the slot, the end of the cam corresponds to the bottom of the push rod, and the outer wall of the fixed block is fixedly connected to the inside of the fixed plate.

[0012] Furthermore, a sealing box is fixedly connected to the top of the support rod, and a mounting interface is fixedly connected to the interior of the sealing box, one end of the connecting pipe is connected to the interior of the sealing box, and the other end of the connecting pipe is connected to the interior of the sealing cavity.

[0013] Furthermore, a gas-liquid booster pump is fixedly installed on the top of the fixed plate, an encoder is fixedly installed inside the test chamber, and the encoder is connected to the output shaft of the servo motor through a belt.

[0014] Compared with the prior art, the above solution has the following beneficial effects: 1. The rotating rod is driven to rotate by turning the knob, so that the sliding rod is driven to slide along the inner wall of the slide groove, and then multiple sliding rods slide along the inner wall of the first limit groove in a direction away from each other, so that the rotation diameter of the cam becomes larger, which can increase the vibration amplitude of the brake pipe interface, so that it can be adaptively adjusted according to the bearing limit vibration amplitude of different brake pipe interfaces, and at the same time, the vibration amplitude can be finely controlled to meet the test requirements of different brake pipes under different working conditions.

[0015] 2. When the vibration amplitude at the brake pipe interface reaches the limit and leakage occurs, the leaked hydraulic oil will flow into the inside of the sealing box, and then the hydraulic oil in the sealing cavity will drive the sealing block to slide upward along the inner wall of the sealing cavity. When the movable block moves upward to a certain position, the rotation of the cam will no longer contact the stop rod, thereby achieving automatic cessation of the vibration test on the brake pipe interface when the brake pipe interface leaks, which improves work efficiency and effectively avoids further damage to the setting and the brake pipe due to continuous vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure proposed by the present invention; Figure 2 A structural cross-sectional view of the interior of the test chamber proposed by the present invention; Figure 3 A structural cross-sectional view of the dynamic vibration mechanism proposed by the present invention; Figure 4 A partial structural schematic diagram of the dynamic vibration mechanism proposed by the present invention; Figure 5 A cross-sectional view of the first part of the transmission mechanism proposed by the present invention; Figure 6 A cross-sectional view of the second part of the transmission mechanism proposed by the present invention; Figure 7 This is a partial cross-sectional view of the structural connection proposed by the present invention.

[0017] The marks in the attached drawings are: 1, test chamber; 2, servo motor; 3, rotating shaft; 4, dynamic vibration mechanism; 5, fixing plate; 6, transmission mechanism; 7, sealing box; 8, installation interface; 9, gas-liquid booster pump; 10, encoder; 401, rotating plate; 402, first through groove; 403, first limiting rod; 404, first slider; 405, first spring; 406, cam; 407, extrusion block; 408, fixing cylinder; 409, connecting shell ...9, connecting shell; 409, connecting shell; 409, connecting shell; 409, connecting shell; 409, connecting shell; 409, connecting shell; 409, connecting shell; 409, connecting shell; 409, connecting shell; 409, connecting shell; 409, connecting shell; 409, connecting shell; 409, connecting shell; 409, connecting plate; 401, rotating plate; 402, first through groove; 10. first limiting groove; 411. turntable; 412. slide groove; 413. slide rod; 414. extrusion plate; 415. turn rod; 416. knob; 601. movable block; 602. second through groove; 603. second limiting rod; 604. second slider; 605. second spring; 606. push rod; 607. second limiting groove; 608. fixed block; 609. sealing chamber; 610. sealing block; 611. connecting pipe; 612. slot. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] In the description of the present invention, it should be understood that the terms "upper", "lower", "top surface", "bottom surface" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations of the present invention. In addition, the terms "first" and "second" are only used to distinguish an entity or operation from another entity or operation, and do not require or imply any actual relationship, order or relative importance between these entities or operations.

[0020] For example, see Figure 1 , Figure 2 and Figure 7 A durable fatigue test device for a connection of a brake pipe of an automobile, comprising a test chamber 1, a servo motor 2 is fixedly installed inside the test chamber 1, and a rotating shaft 3 is fixedly connected to the output shaft of the servo motor 2, a fixing plate 5 is fixedly connected inside the test chamber 1, a sealing box 7 is fixedly connected to the top of a stop rod 606, and a mounting interface 8 is fixedly connected to the inside of the sealing box 7, and a gas-liquid booster pump 9 is fixedly installed on the top of the fixing plate 5; Before testing the brake pipe interface, first connect the end of the brake pipe to the gas-liquid booster pump 9, and then drive the gas-liquid booster pump 9 to fill the brake pipe with hydraulic oil. The control panel can be used to set the gas-liquid booster pump 9 to pressurize the inside of the brake pipe to the pressure value required for the test. If the brake pipe interface leaks during the test, it can be replenished to the set value in time. Then open the sealing box 7, and then threadedly connect the threaded interface of the brake pipe to be tested with the inside of the installation interface 8. Then close the sealing box 7 so that the inner wall of the sealing box 7 is a sealed space, thereby completing the installation work for testing the brake pipe.

[0021] For example 2, please refer to Figure 2-4 On the basis of the first embodiment, in this embodiment, a dynamic vibration mechanism 4 is provided at the end of the rotating shaft 3 so as to apply working pressures of different vibration amplitudes to the brake pipe interface when the brake pipe interface is tested; The dynamic vibration mechanism 4 includes a rotating plate 401, and a first through slot 402 is formed through the side wall of the rotating plate 401, a first limiting rod 403 is fixedly connected to the inside of the first through slot 402, and a first slider 404 is slidably connected to the outer wall of the first limiting rod 403, a first spring 405 is fixedly connected to the side wall of the first slider 404, and the end of the first spring 405 away from the first slider 404 is fixedly connected to the inner wall of the first through slot 402, a cam 406 is fixedly connected to the outer wall of the first slider 404, and an extrusion block 407 is fixedly connected to one end of the first slider 404, a fixing cylinder 408 is fixedly connected to the inner wall of the test chamber 1, and one end of the fixing cylinder 408 is fixedly connected to a connecting shell 409, a first limiting slot 410 is formed through the side wall of the connecting shell 409, and a connecting A turntable 411 is rotatably connected inside the shell 409, and a slide groove 412 is penetrated through the side wall of the turntable 411, a slide rod 413 is rotatably connected to the inner wall of the slide groove 412, and the outer wall of the slide rod 413 is slidably connected to the inner wall of the first limit groove 410, an extrusion plate 414 is fixedly connected to the end of the slide rod 413 away from the slide groove 412, a rotating rod 415 is fixedly connected to the side wall of the extrusion plate 414, and the outer wall of the rotating rod 415 is rotatably connected to the inner wall of the fixed cylinder 408, a knob 416 is fixedly connected to the end of the rotating plate 401, the end of the rotating plate 401 is fixedly connected to the end of the rotating shaft 3, the outer wall of the extrusion block 407 is slidably fitted with the outer wall of the fixed cylinder 408, and the outer wall of the fixed cylinder 408 is rotatably connected to the inside of the test chamber 1.

[0022] When testing the brake pipe interface, the servo motor 2 is driven to output, so that the shaft 3 of the output shaft rotates, and then the shaft 3 drives the rotating plate 401 to rotate synchronously, and the rotating plate 401 drives the cam 406 to move through the first slider 404. During this process, the cam 406 squeezes the sealing box 7 through the transmission mechanism 6, so that when the rotating plate 401 rotates one circle, the sealing box 7 performs a vibration test on the brake pipe interface inside the mounting interface 8. When it is necessary to test different vibration amplitudes on the brake pipe interface, the rotating knob 416 is controlled to rotate the rotating rod 415, and then the first spring 405 drives the turntable 411 to rotate along the inner wall of the connecting shell 409 during the rotation process, and can drive the sliding rod 413 to slide along the inner wall of the sliding groove 412. Since the direction of the sliding groove 412 is limited by the first limiting groove 410, when the turntable 411 rotates, multiple sliding rods 413 can be moved away from each other along the inner wall of the first limiting groove 410. The outer wall of the extrusion plate 414 is used to squeeze the extrusion block 407, and then the extrusion block 407 is driven to slide outward along the inner wall of the first through groove 402 when squeezed. At the same time, the first slide block 404 drives the cam 406 to move synchronously, so that the rotation diameter of the cam 406 becomes larger, which can increase the vibration amplitude of the brake pipe interface. The outer wall of the rotating rod 415 and the knob 416 that are rotatably connected are provided with a damping material to prevent the rotating rod 415 from driving the rotating disk 411 to deviate. When it is necessary to reduce the vibration amplitude of the brake pipe interface, the knob 416 is rotated in the opposite direction to move the multiple extrusion plates 414 in the direction of approaching each other, so that the first slide block 404 is driven by the first spring 405 to reset and slide to change the rotation diameter of the cam 406, so that it can be adaptively adjusted according to the bearing limit vibration amplitude of different brake pipe interfaces.

[0023] For example 3, please refer to Figure 2 and Figure 5-7 On the basis of the second embodiment, in this embodiment, a transmission mechanism 6 is provided inside the fixing plate 5 so as to automatically stop the vibration test on the brake pipe interface when the brake pipe interface leaks under extreme working conditions; The transmission mechanism 6 includes a movable block 601, and a second through slot 602 is formed through the side wall of the movable block 601, a second limiting rod 603 is fixedly connected to the inner wall of the second through slot 602, and a second slider 604 is fixedly connected to the outer wall of the second limiting rod 603, a second spring 605 is fixedly connected to the top of the second slider 604, and an end of the second spring 605 away from the second limiting rod 603 is fixedly connected to the inner wall of the second through slot 602, a push rod 606 is slidably connected to the inner wall of the movable block 601, an end of the second slider 604 is fixedly connected to the outer wall of the push rod 606, a second limiting slot 607 is formed through the inside of the movable block 601, and a fixed block 608 is slidably connected to the inner wall of the second limiting slot 607, a sealing cavity 609 is formed inside the fixed block 608, and a sealing cavity 609 is formed inside the fixed block 608. The inner wall of the cavity 609 is slidably connected with a sealing block 610, the outer wall of the sealing block 610 is fixedly connected to the inner wall of the second limit groove 607, the interior of the sealing block 610 is penetrated and fixedly connected with a connecting pipe 611, the bottom of the movable block 601 is provided with a slot 612, the outer wall of the movable block 601 is slidably connected to the inside of the fixed plate 5, the side wall of the cam 406 is slidably connected to the side wall of the slot 612, the end of the cam 406 corresponds to the bottom of the push rod 606, the outer wall of the fixed block 608 is fixedly connected to the inside of the fixed plate 5, one end of the connecting pipe 611 is connected to the inside of the sealing box 7, and the other end of the connecting pipe 611 is connected to the inside of the sealed cavity 609, the inside of the test cabin 1 is fixedly installed with an encoder 10, and the encoder 10 is connected to the output shaft of the servo motor 2 through a belt.

[0024] During the test of the brake pipe interface, the cam 406 can drive the push rod 606 to slide upward along the inside of the movable block 601. During this process, the second slider 604 slides along the outer wall of the second through groove 602, which can ensure that the sliding of the push rod 606 is more stable. At the same time, when the cam 406 passes over the end of the push rod 606, the second spring 605 can drive the push rod 606 to quickly reset and slide, which will not affect the next vibration test. When the brake pipe interface is subjected to a vibration amplitude reaching a limit and a leak occurs, the leaked hydraulic oil will flow into the interior of the sealing box 7. At the same time, the internal pressure of the brake pipe cannot reach the set value. Then the gas-liquid booster pump 9 will fill the brake pipe with new hydraulic oil. Since the interior of the sealing box 7 is a sealed space during the test, then The hydraulic oil will enter the interior of the sealing chamber 609 through the connecting pipe 611, and then the hydraulic oil will drive the sealing block 610 to slide upward along the inner wall of the sealing chamber 609, and then the sealing block 610 will drive the movable block 601 to slide upward along the inside of the fixed plate 5, and at the same time drive the push rod 606 to move upward synchronously. When the movable block 601 moves upward to a certain position, the rotation of the cam 406 will no longer contact the push rod 606, thereby realizing that when the brake pipe interface leaks, the vibration test of the brake pipe interface can be automatically stopped. During the vibration test, the vibration amplitude applied by the cam 406 to the push rod 606 and the encoder 10 to the output shaft rotation of the servo motor 2 calculate the swing value, so that the limit vibration frequency of the brake pipe when it leaks at different vibration amplitudes under the operating pressure can be tested.

[0025] The working principle of the present invention is: before testing the brake pipe interface, first connect the end of the brake pipe to the gas-liquid booster pump 9, then drive the gas-liquid booster pump 9 to fill the brake pipe with hydraulic oil, and the gas-liquid booster pump 9 can be set through the control panel to boost the pressure inside the brake pipe to the pressure value required for the test. When the brake pipe interface leaks during the test, it can be replenished to the set value in time, then open the sealing box 7, and then thread the threaded interface of the brake pipe to be tested with the inside of the installation interface 8, and then close the sealing box 7 to make the inner wall of the sealing box 7 a sealed space, thereby completing the installation work of testing the brake pipe, and then through The servo motor 2 is driven to output, so that the shaft 3 of the output shaft rotates, and then the shaft 3 drives the rotating plate 401 to rotate synchronously. At the same time, the rotating plate 401 drives the cam 406 to move through the first slider 404. In this process, the cam 406 squeezes the sealing box 7 through the transmission mechanism 6, so that when the rotating plate 401 rotates one circle, the sealing box 7 performs a vibration test on the brake pipe interface inside the installation interface 8. When it is necessary to test different vibration amplitudes on the brake pipe interface, the rotating knob 416 is controlled to drive the rotating rod 415 to rotate, and then the first spring 405 drives the rotating disk 411 along the connecting shell during the rotation process. The inner wall of 409 rotates, and at the same time, it can drive the slide bar 413 to slide along the inner wall of the slide groove 412. Since the direction of the slide groove 412 is limited by the first limiting groove 410, when the turntable 411 rotates, the multiple slide bars 413 can slide along the inner wall of the first limiting groove 410 in a direction away from each other. At the same time, the slide bar 413 will drive the corresponding extrusion plate 414 to move, so that the distance between the multiple extrusion plates 414 becomes larger. In this process, the outer wall of the extrusion plate 414 will squeeze the extrusion block 407, and then the extrusion block 407 will drive the first slider 404 to slide outward along the inner wall of the first through groove 402 when it is squeezed. At the same time, the first slider 404 will drive the cam 406 to move synchronously, so that the rotation diameter of the cam 406 becomes larger, which can increase the vibration amplitude of the brake pipe interface. The outer wall of the rotating rod 415 and the knob 416 that are rotatably connected is provided with a damping material to prevent the rotating rod 415 from driving the rotating disk 411 to deviate. When it is necessary to reduce the vibration amplitude of the brake pipe interface, the knob 416 is rotated in the opposite direction to move the multiple extrusion plates 414 in a direction close to each other, so that the first slider 404 is driven by the first spring 405 to reset and slide to change the rotation diameter of the cam 406, so that it can be adaptively adjusted according to the bearing limit vibration amplitude of different brake pipe interfaces; When the vibration amplitude of the brake pipe interface reaches the limit and leakage occurs, the leaked hydraulic oil will flow into the interior of the sealing box 7. At the same time, the internal pressure of the brake pipe cannot reach the set value. Then the gas-liquid booster pump 9 will fill the brake pipe with new hydraulic oil. Then the hydraulic oil will enter the sealing cavity 609 through the connecting pipe 611. Thereafter, the hydraulic oil will drive the sealing block 610 to slide upward along the inner wall of the sealing cavity 609. Then the sealing block 610 will drive the movable block 601 to slide upward along the inside of the fixed plate 5, and at the same time will drive the push rod 606 to move upward synchronously. When the movable block 601 moves upward to a certain position, the rotation of the cam 406 will no longer contact the push rod 606, thereby realizing that when the brake pipe interface is leaking, the vibration test of the brake pipe interface can be automatically stopped.

[0026] It should be noted that the various devices in this application are common devices in the market, and can be selected according to specific needs during specific use. The circuit connection relationship of each device belongs to a simple series and parallel connection circuit. There is no innovation in the circuit connection part. Those skilled in the art can implement it relatively easily. It belongs to the existing technology and will not be elaborated on.

[0027] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A vehicle brake pipe connection endurance fatigue test device, comprising a test chamber (1), characterized in that: A servo motor (2) is fixedly installed inside the test chamber (1), and the output shaft of the servo motor (2) is fixedly connected to a rotating shaft (3), and a fixing plate (5) is fixedly connected to the inside of the test chamber (1); The end of the rotating shaft (3) is provided with a dynamic vibration mechanism (4) so ​​as to apply working pressures with different vibration amplitudes to the brake pipe interface when the brake pipe interface is tested; A transmission mechanism (6) is arranged inside the fixing plate (5) to automatically stop the vibration test on the brake pipe interface when the brake pipe interface leaks under extreme working conditions; The dynamic vibration mechanism (4) comprises a rotating plate (401), and a first through slot (402) is formed through a side wall of the rotating plate (401); a first limiting rod (403) is fixedly connected inside the first through slot (402), and a first slider (404) is slidably connected to an outer wall of the first limiting rod (403); a first spring (405) is fixedly connected to the side wall of the first slider (404), and an end of the first spring (405) away from the first slider (404) is fixedly connected to the inner wall of the first through slot (402); a cam (406) is fixedly connected to the outer wall of the first slider (404), and an extrusion block (407) is fixedly connected to one end of the first slider (404).

2. The automobile brake pipe connection endurance fatigue test equipment according to claim 1, characterized in that: The inner wall of the test chamber (1) is fixedly connected to a fixing cylinder (408), and one end of the fixing cylinder (408) is fixedly connected to a connecting shell (409), a side wall of the connecting shell (409) is penetrated with a first limiting groove (410), the interior of the connecting shell (409) is rotatably connected to a rotating disk (411), and a sliding groove (412) is penetrated through the side wall of the rotating disk (411), the inner wall of the sliding groove (412) is rotatably connected to a sliding rod (413), and the sliding rod (413) is ) is slidably connected to the inner wall of the first limiting groove (410), the end of the sliding rod (413) away from the sliding groove (412) is fixedly connected to the extrusion plate (414), the side wall of the extrusion plate (414) is fixedly connected to the rotating rod (415), and the outer wall of the rotating rod (415) is rotatably connected to the inner wall of the fixed cylinder (408), and the end of the rotating rod (415) away from the rotating disk (411) is fixedly connected to the knob (416).

3. The automobile brake pipe connection endurance fatigue test equipment according to claim 2, characterized in that: The end of the rotating plate (401) is fixedly connected to the end of the rotating shaft (3), the outer wall of the extrusion block (407) slides in contact with the outer wall of the fixed cylinder (408), and the outer wall of the fixed cylinder (408) penetrates and is rotatably connected to the inside of the test chamber (1).

4. The automobile brake pipe connection endurance fatigue test equipment according to any one of claims 1 to 3, characterized in that: The transmission mechanism (6) comprises a movable block (601), and a second through slot (602) is formed through a side wall of the movable block (601), a second limiting rod (603) is fixedly connected to the inner wall of the second through slot (602), and a second sliding block (604) is fixedly connected to the outer wall of the second limiting rod (603), a second spring (605) is fixedly connected to the top of the second sliding block (604), and an end of the second spring (605) away from the second limiting rod (603) is fixedly connected to the inner wall of the second through slot (602), a stop rod (606) is slidably formed through the inner wall of the movable block (601), and an end of the second sliding block (604) is fixedly connected to the outer wall of the stop rod (606).

5. The automobile brake pipe connection endurance fatigue test equipment according to claim 4, characterized in that: The movable block (601) is provided with a second limiting groove (607) extending therethrough, and a fixed block (608) is slidably connected to the inner wall of the second limiting groove (607), a sealing cavity (609) is provided therethrough, and a sealing block (610) is slidably connected to the inner wall of the sealing cavity (609), an outer wall of the sealing block (610) is fixedly connected to the inner wall of the second limiting groove (607), a connecting pipe (611) extends therethrough and is fixedly connected thereto, and a groove (612) is provided at the bottom of the movable block (601).

6. The automobile brake pipe connection endurance fatigue test equipment according to claim 5, characterized in that: The outer wall of the movable block (601) is slidably connected to the inside of the fixed plate (5), the side wall of the cam (406) is slidably connected to the side wall of the slot (612), the end of the cam (406) corresponds to the bottom of the support rod (606), and the outer wall of the fixed block (608) is fixedly connected to the inside of the fixed plate (5).

7. The automobile brake pipe connection endurance fatigue test equipment according to claim 6, characterized in that: The top of the support rod (606) is fixedly connected to a sealing box (7), and the interior of the sealing box (7) is fixedly connected to a mounting interface (8), one end of the connecting pipe (611) is connected to the interior of the sealing box (7), and the other end of the connecting pipe (611) is connected to the interior of the sealing cavity (609).

8. The automobile brake pipe connection endurance fatigue test equipment according to claim 1, characterized in that: A gas-liquid booster pump (9) is fixedly mounted on the top of the fixed plate (5), an encoder (10) is fixedly mounted inside the test chamber (1), and the encoder (10) is connected to the output shaft of the servo motor (2) via a belt.

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