Brake master cylinder performance detection equipment

Abstract

The utility model discloses brake master cylinder performance detection equipment which comprises a detection equipment support, a power area, a detection area and a code printing area, the power area is arranged on the lower layer of the detection equipment support, and the detection area and the code printing area are arranged on the upper layer of the detection equipment support; the coding area is arranged at the outlet of the detection area; the detection area comprises a rotating disc assembly, a preassembling detection assembly, a smoothness and idle stroke detection assembly, a vacuum dynamic sealing performance detection assembly, a low-air-pressure static sealing performance detection assembly and a first auxiliary bowl sealing performance detection assembly. A tool positioning seat is arranged on the turntable assembly, a brake master cylinder is placed on the tool positioning seat, and the brake master cylinder is conveyed to each detection assembly in the detection area through the turntable assembly to be detected; the brake master cylinder performance detection equipment provided by the utility model is simple in structure, reasonable in design, capable of effectively fixing a brake master cylinder, and high in automation.

Description

Technical Field

[0001] The utility model relates to the technical field of brake master cylinder performance detection, and more specifically, to a brake master cylinder performance detection device. Background Art

[0002] The brake master cylinder, also known as the hydraulic brake master cylinder, is the power source of the vehicle braking system. The braking force comes from the pedal force applied by the driver on the brake pedal and the vacuum degree of the engine intake pipe (vacuum boost), among which the vacuum degree is the main power source of the master cylinder.

[0003] In the existing brake master cylinder seal inspection assembly, the brake master cylinder cannot be effectively fixed and tested for a long time, so the inspection efficiency is low and the effect is not good. Therefore, automated and efficient inspection equipment is needed. Generally, specially designed brake master cylinder test equipment is used. It is an inspection equipment to check whether the assembly process is effective and reliable during the production of the brake master cylinder product, and it is a guarantee of product quality. The brake master cylinder inspection equipment in the prior art is a single inspection device to detect one item, and multiple inspection items require multiple inspection devices. However, multiple inspection devices are arranged in a straight line and occupy a large production site. The brake master cylinder to be tested needs to be manually transported between the devices, and each inspection device requires personnel to operate. The overall degree of automation is still very low, and a large number of operators are still required for inspection, and the inspection efficiency is not high.

[0004] Therefore, in order to address the above problems, it is necessary to carry out innovative design of the seal detection assembly of the brake master cylinder, which requires highly automated detection equipment and the ability to achieve long-term effective fixed testing. Utility Model Content

[0005] The utility model overcomes the shortcomings of the prior art and provides a brake master cylinder performance detection device which has a simple structure, a reasonable design, can effectively fix the brake master cylinder, and is highly automated.

[0006] The technical solution of the utility model is as follows:

[0007] A brake master cylinder performance testing device comprises a testing device bracket, a power area, a testing area and a coding area, wherein the power area is arranged at the lower layer of the testing device bracket, and the testing area and the coding area are arranged at the upper layer of the testing device bracket; the coding area is arranged at the exit of the testing area;

[0008] The testing area includes a turntable assembly, a pre-installation testing assembly, a patency and empty stroke testing assembly, a vacuum dynamic sealing testing assembly, a low-pressure static sealing testing assembly, and a first pair of bowl sealing testing assembly;

[0009] A tooling positioning seat is arranged on the turntable assembly, a brake master cylinder is placed on the tooling positioning seat, and the brake master cylinder is transported to each detection assembly in the detection area through the turntable assembly for detection;

[0010] The pre-installed detection component is used to detect whether the brake master cylinder is placed in the detection position and whether the piston rod can move normally.

[0011] Furthermore, the turntable assembly includes a fixed disk and a rotating disk, which are rotatably connected, and the width of the rotating disk is greater than the width of the fixed disk; the tooling positioning seats are distributed and arranged at the part of the rotating disk that is not covered by the fixed disk;

[0012] The lower layer of the detection equipment bracket is provided with a driving device for driving the rotating disk to rotate;

[0013] The lower layer of the detection equipment bracket also includes a servo loading mechanism. An opening is set at the rotating disk corresponding to the tooling positioning seat, and the servo loading mechanism abuts against the piston rod of the brake master cylinder on the tooling positioning seat through the setting of the opening; a tightening mechanism is set on the fixed disk according to the position distribution of each detection component, and the tightening mechanism and the servo loading mechanism apply force to the brake master cylinder on the tooling positioning seat from top to bottom.

[0014] Furthermore, a liquid inlet blocking mechanism is provided on the fixed plate, and is provided at a corresponding position according to the detection requirements of each detection component; a liquid discharge port blocking mechanism is provided at a corresponding position on the upper layer of the detection equipment bracket; and sensors are provided on the plugs of the liquid inlet blocking mechanism and the liquid discharge port blocking mechanism according to the corresponding detection requirements;

[0015] The fixed disk is also provided with a corresponding air source component, which is connected with the corresponding detection component.

[0016] Further, the pre-installed detection component and the first pair of bowl sealing detection components include a liquid inlet blocking mechanism;

[0017] The patency and empty stroke detection component, the vacuum dynamic sealing detection component and the low-pressure static sealing detection component include a liquid inlet blocking mechanism and a liquid outlet blocking mechanism.

[0018] Furthermore, the liquid inlet blocking mechanism includes a liquid inlet lateral moving structure and a liquid inlet longitudinal moving structure, the liquid inlet longitudinal moving structure is connected to the servo loading mechanism, the liquid inlet lateral moving structure is provided with a corresponding liquid inlet slide groove through the liquid inlet middle piece to realize the movement of the lateral moving structure, and the liquid inlet lateral moving structure is provided with a liquid inlet blocking head;

[0019] A liquid inlet communication hole is provided between the liquid inlet plugging head, the liquid inlet lateral movement structure, the liquid inlet longitudinal movement structure and the liquid inlet middle piece;

[0020] The liquid inlet longitudinal moving structure is connected with the air source component.

[0021] Furthermore, the drain port plugging mechanism includes a drain port transverse moving structure, a drain port longitudinal moving structure and a drain port plugging frame; the drain port longitudinal moving structure is arranged inside the drain port plugging frame, and the up and down movement is achieved by a screw rod; the drain port transverse moving structure is arranged outside the drain port plugging frame, and the movement is controlled by the drain port transverse motor, and the drain port transverse motor protects the corresponding wires and pipes through a drag chain; a drain port plugging head is arranged on the drain port transverse moving structure.

[0022] Compared with the prior art, the utility model has the following advantages:

[0023] The utility model reduces the overall detection cost through reasonable design, optimizes the space layout requirements of the brake master cylinder detection equipment in the production line through the design and manufacture of the brake master cylinder detection equipment, shortens the detection length, realizes the high efficiency of product circulation by one person operating one detection equipment, and reduces the time of multiple assembly and disassembly of products and the possible risk of product collision when using single-station detection equipment, greatly improving the detection efficiency. The utility model accurately designs the specific detection position and steps, and improves the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 It is a partial structural schematic diagram of the utility model;

[0026] Figure 3 This is a schematic diagram of the distribution of components of the utility model;

[0027] Figure 4 It is a top view of the overall structure of the utility model;

[0028] Figure 5 It is a schematic diagram of the servo loading mechanism of the utility model;

[0029] Figure 6 It is a schematic diagram of the liquid inlet blocking mechanism of the utility model;

[0030] Figure 7 This is a schematic diagram of the liquid inlet blocking mechanism of the utility model from another perspective;

[0031] Figure 8 It is a schematic diagram of the liquid discharge port blocking mechanism of the utility model;

[0032] Fig. 9 It is a schematic diagram of the liquid discharge port blocking mechanism of the utility model from another perspective;

[0033] Fig.10 It is a schematic diagram of the tightening mechanism of the utility model;

[0034] Fig.11 It is a schematic diagram of the brake master cylinder matching detection of the utility model;

[0035] Fig.12 It is a schematic diagram of the brake master cylinder of the utility model.

[0036] In the figure, symbols are: brake master cylinder 1, piston 101, compensation hole 102, liquid discharge port 103, liquid inlet 104, first auxiliary bowl 105, first liquid inlet 106;

[0037] Power area 2, driving device 201, servo loading mechanism 202;

[0038] Turntable assembly 3, tooling positioning seat 301, fixed disk 302, rotating disk 303, tightening mechanism 304, liquid inlet blocking mechanism 305, liquid discharge port blocking mechanism 306, air source assembly 307, liquid inlet lateral moving structure 308, liquid inlet longitudinal moving structure 309, liquid inlet middle piece 310, liquid inlet slide 311, liquid inlet blocking head 312, liquid inlet connecting hole 313, liquid discharge port lateral moving structure 314, liquid discharge port longitudinal moving structure 315, liquid discharge port blocking frame 316, liquid discharge port lateral motor 317, drag chain 318, liquid discharge port blocking head 319;

[0039] Pre-installation detection component 4, patency and empty stroke detection component 5, vacuum dynamic sealing detection component 6, low pressure static sealing detection component 7, first pair of bowl sealing detection component 8, coding area 9. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and cannot be used as a limitation of the present invention.

[0041] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the utility model belongs. It should also be understood that those terms such as those defined in general dictionaries should be understood to have the same meaning as the meaning in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as here.

[0042] The step numbers mentioned in each embodiment are only for the convenience of description and have no substantial sequence connection. Different steps in each specific embodiment can be combined in different sequences to achieve the utility model purpose of the utility model.

[0043] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0044] like Figures 1 to 12 As shown, a brake master cylinder 1 performance detection device includes a detection device bracket, a power area 2, a detection area and a coding area 9, wherein the power area 2 is arranged at the lower layer of the detection device bracket, and the detection area and the coding area 9 are arranged at the upper layer of the detection device bracket; the coding area 9 is arranged at the exit of the detection area; the detection process is solved on the same layer, which greatly reduces the layout space, better realizes the detection, and improves the detection efficiency.

[0045] The detection area includes a turntable assembly 3, a pre-installation detection assembly 4, a patency and empty stroke detection assembly 5, a vacuum dynamic sealing detection assembly 6, a low pressure static sealing detection assembly 7 and a first auxiliary bowl sealing detection assembly 8;

[0046] A tooling positioning seat 301 is provided on the turntable assembly 3, on which the brake master cylinder 1 is placed, and the brake master cylinder 1 is transported to each detection assembly in the detection area through the turntable assembly 3 for detection; that is, the movement of the brake master cylinder 1 to be detected is achieved through the turntable assembly 3.

[0047] The pre-installed detection component 4 is used to detect whether the brake master cylinder 1 is placed in the detection position and whether the piston 101 rod can move normally;

[0048] The patency and idle stroke detection component 5 is used to detect the patency of the brake master cylinder 1 and calculate the displacement stroke of the piston 101;

[0049] The vacuum dynamic sealing detection component 6 is used to detect the dynamic sealing of the brake master cylinder 1 under a vacuum environment;

[0050] The low-pressure static sealing detection component 7 is used to detect the static sealing of the brake master cylinder 1 under a low-pressure environment;

[0051] The first auxiliary bowl sealing detection component 8 is used to detect the sealing of the first auxiliary bowl 105 of the brake master cylinder 1.

[0052] Specifically, the turntable assembly 3 includes a fixed disk 302 and a rotating disk 303, which are rotatably connected, and the width of the rotating disk 303 is greater than that of the fixed disk 302; the tooling positioning seat 301 is distributed at the part of the rotating disk 303 that is not covered by the fixed disk 302; in this way, the brake master cylinder 1 can be moved to the corresponding position through the rotating disk 303.

[0053] The lower layer of the detection equipment support is provided with a driving device 201 for driving the rotating disk 303 to rotate;

[0054] The lower layer of the detection equipment bracket also specifically includes a servo loading mechanism 202. The rotating disk 303 is provided with an opening corresponding to the tooling positioning seat 301. The servo loading mechanism 202 abuts against the piston 101 rod of the brake master cylinder 1 on the tooling positioning seat 301 through the opening. The fixed disk 302 is provided with a tightening mechanism 304 according to the position distribution of each detection component. The tightening mechanism 304 and the servo loading mechanism 202 apply force to the brake master cylinder 1 on the tooling positioning seat 301 from top to bottom. The servo loading mechanism 202 adopts a servo motor to drive a ball screw to achieve adjustable speed, uniform slow loading, and achieve precise control of force and displacement during the loading process. Displacement sensors and force sensors are provided to accurately measure the force and displacement of the mechanism during the loading process.

[0055] A liquid inlet blocking mechanism 305 is provided on the fixed disk 302, and is provided at a corresponding position according to the detection requirements of each detection component; a liquid discharge port blocking mechanism 306 is provided at a corresponding position on the upper layer of the detection device support; sensors are provided on the plugs of the liquid inlet blocking mechanism 305 and the liquid discharge port blocking mechanism 306 according to the corresponding detection requirements;

[0056] A corresponding air source component 307 is also provided on the fixed disk 302 and is connected to the corresponding detection component.

[0057] Specifically, the pre-installed detection component 4 and the first bowl sealing detection component 8 include a liquid inlet blocking mechanism 305;

[0058] The patency and idle stroke detection component 5 , the vacuum dynamic sealing detection component 6 and the low pressure static sealing detection component 7 include a liquid inlet blocking mechanism 305 and a liquid outlet blocking mechanism 306 .

[0059] The liquid inlet blocking mechanism 305 includes a liquid inlet transverse moving structure 308 and a liquid inlet longitudinal moving structure 309. The liquid inlet longitudinal moving structure 309 is connected to the servo loading mechanism 202. The liquid inlet transverse moving structure 308 is provided with a corresponding liquid inlet slide 311 through the liquid inlet middle piece 310 to realize the movement of the transverse moving structure. The liquid inlet blocking head 312 is provided on the liquid inlet transverse moving structure 308.

[0060] A liquid inlet communication hole 313 is provided between the liquid inlet plugging head 312, the liquid inlet transverse moving structure 308, the liquid inlet longitudinal moving structure 309 and the liquid inlet middle piece 310;

[0061] The liquid inlet longitudinal moving structure 309 is connected to the air source component 307 .

[0062] The drainage port plugging mechanism 306 includes a drainage port transverse moving structure 314, a drainage port longitudinal moving structure 315 and a drainage port plugging frame 316; the drainage port longitudinal moving structure 315 is arranged inside the drainage port plugging frame 316, and is moved up and down by a screw rod; the drainage port transverse moving structure 314 is arranged outside the drainage port plugging frame 316, and is controlled to move by a drainage port transverse motor 317, and the drainage port transverse motor 317 is used to protect the corresponding wires and pipes through a drag chain 318; the drainage port plugging head 319 is arranged on the drainage port transverse moving structure 314. The drainage port plugging head 319 is provided with a liquid distribution port communication hole for connecting the corresponding air pipe for plugging and unblocking.

[0063] The specific testing process is as follows:

[0064] A performance testing process for a brake master cylinder 1, including the above-mentioned device, specifically comprises the following steps:

[0065] ① Steps for installing the brake master cylinder 1: the manipulator places the semi-finished brake master cylinder 1 on the corresponding tooling positioning seat 301, and automatically moves the brake master cylinder 1 to the pre-installation detection component 4 through the turntable component 3;

[0066] ② Pre-installation test step: Check whether there is a brake master cylinder 1 to be tested, and check the activity state of the piston 101 in the brake master cylinder 1; after the test is correct, move to the next test component;

[0067] The servo loading mechanism 202 corresponding to the pre-installed detection component 4 pushes the piston 101 to move a set number of times, and provides strong monitoring and protection during the pushing process; the servo loading mechanism 202 lifts the piston 101 to a set position, the liquid inlet blocking mechanism 305 blocks the liquid inlet 104, and charges high-pressure gas to the liquid discharge port 103 to expand the leather cup of the brake master cylinder 1;

[0068] ③ Patency and idle stroke detection steps: detect the patency of the brake master cylinder 1 and calculate the displacement stroke of the piston 101; after the detection, move to the next detection component;

[0069] Specifically, the gas with a pressure of 50KPa is controlled by a precision pressure regulating valve to flow into the master cylinder cavity through the discharge port 103 of the brake master cylinder 1 and out through the master cylinder inlet 104; a high-precision flow sensor is set at the discharge port 103 to collect the flow rate, and judge the patency of the compensation hole 102 of the brake master cylinder 1 based on it; the servo motor corresponding to the patency and empty stroke detection component 5 pushes the brake master cylinder 1 through the lead screw to move the piston 101, and the displacement of the piston 101 is calculated from the time the push rod contacts the piston 101. When the flow value of the discharge port 103 is finally zero, the displacement of the push rod is measured, so that the empty stroke value of the brake master cylinder 1 is automatically calculated;

[0070] ④ Vacuum dynamic sealing test step: used to test the dynamic sealing of the brake master cylinder 1 under vacuum environment; after the test is correct, move to the next test component;

[0071] Specifically, the servo loading mechanism 202 corresponding to the vacuum dynamic sealing detection component 6 pushes the piston 101 through the compensation hole 102 of the brake master cylinder 1 to the set position, and controls the gas with a pressure of -80KPa to pass into the discharge port 103 through the precision pressure regulating valve. After the air pressure is stable, the gas source is disconnected, and then the servo loading mechanism 202 is controlled to push the piston 101 to the set position, then stop and retreat (its speed can be set within a certain range), record the current pressure drop value and compare it with the set value, and judge whether the brake master cylinder 1 is qualified; wherein, the contact between the push rod of the brake master cylinder 1 and the piston 101 is the displacement zero point, and the push rod continues to push the piston 101 until the thrust reaches the setting, and the push rod displacement position is recorded as the full stroke of the master cylinder;

[0072] ⑤ Low-pressure static sealing test step: The low-pressure static sealing test component 7 is used to test the static sealing of the brake master cylinder 1 under a low-pressure environment; after the test is correct, move to the next test component;

[0073] Specifically, the servo loading mechanism 202 corresponding to the low-pressure static sealing detection component 7 pushes the piston 101 through the compensation hole 102 to the set position, and controls the gas with a pressure of 100KPa to pass into the discharge port 103 through the precision pressure regulating valve. After the air pressure is stable, the air source is disconnected, and the pressure drop value within the set time is recorded by the COSMO leak detector and compared with the set value to determine whether the brake master cylinder 1 is qualified;

[0074] ⑥ Step of testing the sealing performance of the first auxiliary bowl 105: The first auxiliary bowl sealing performance testing component 8 is used to test the sealing performance of the first auxiliary bowl 105 of the brake master cylinder 1; after the test is correct, the process moves to the next testing component;

[0075] Specifically, the servo loading mechanism 202 corresponding to the first sub-bowl sealing detection component 8 pushes the piston 101 to the set position, and controls the gas with a pressure of 80KPa to pass into the first liquid inlet 106 of the brake master cylinder 1 through the precision pressure regulating valve to apply the detection pressure, and disconnects the gas source after the air pressure is stable, and then keeps the air pressure in the cavity for a period of time (this time can be set on the computer within a certain range), records the pressure drop within the specified test time, and then compares it with the set value to determine whether the brake master cylinder 1 is qualified;

[0076] ⑦ Coding and subsequent judgment steps: After the inspection of steps ③ to ⑥, finally move to the coding component for coding and start vacuuming; after coding, move to the automatic scanning station, and bind the data information on each detection component through automatic scanning, and then move to the next station, grab the brake master cylinder 1 through the automatic unloading mechanism, and determine whether the product is qualified according to the data information on each detection component. Qualified products are placed on the qualified conveyor line and sent to the oil filling station; unqualified products are marked with NG data and placed in the NG material channel.

[0077] Among them, under normal circumstances, steps ④ and ⑤ can be switched in order; in theory, even steps ④, ⑤, and ⑥ can be disrupted. Specifically, in step ③, the precision pressure regulating valve adopts a control pressure adjustable within 0KPa to 200KPa; in step ④, the precision pressure regulating valve adopts a control pressure adjustable within -80Kpa to -60KPa; in step ⑤, the precision pressure regulating valve adopts a control pressure adjustable within 50Kpa to 200KPa; in step ⑥, the precision pressure regulating valve adopts a control pressure adjustable within 40~100KPa. Corresponding parameters such as the power source of the air source component 307 is rated at 0.6MPa and used as 0.4MPa; the air pressure measurement accuracy is ±30Pa; the displacement measurement range of the push rod of the brake master cylinder 1 is 0~50mm, and the displacement measurement accuracy is ±0.01mm; the force measurement range is 0~1000N, and the force measurement accuracy is controlled within the fluctuation range of 0.25%.

[0078] In summary, the utility model reduces the overall detection cost through reasonable design, optimizes the space layout requirements of the brake master cylinder 1 detection equipment in the production line through the design and manufacture of the brake master cylinder 1 detection equipment, shortens the detection length, realizes the high efficiency of product circulation by a single person operating a detection equipment, and reduces the time of multiple assembly and disassembly of products and the possible risk of product collision when using single-station detection equipment, greatly improving the detection efficiency. The specific detection position and steps are precisely designed to improve the detection accuracy.

[0079] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A brake master cylinder performance testing device, characterized in that: It includes a detection equipment bracket, a power area, a detection area and a coding area. The power area is arranged at the lower layer of the detection equipment bracket, and the detection area and the coding area are arranged at the upper layer of the detection equipment bracket; the coding area is arranged at the exit of the detection area; The testing area includes a turntable assembly, a pre-installation testing assembly, a patency and empty stroke testing assembly, a vacuum dynamic sealing testing assembly, a low-pressure static sealing testing assembly, and a first pair of bowl sealing testing assembly; A tooling positioning seat is arranged on the turntable assembly, a brake master cylinder is placed on the tooling positioning seat, and the brake master cylinder is transported to each detection assembly in the detection area through the turntable assembly for detection.

2. A brake master cylinder performance testing device according to claim 1, characterized in that: The turntable assembly includes a fixed disk and a rotating disk, which are rotatably connected, and the width of the rotating disk is greater than that of the fixed disk; the tooling positioning seats are distributed and arranged at the part of the rotating disk that is not covered by the fixed disk; The lower layer of the detection equipment bracket is provided with a driving device for driving the rotating disk to rotate; The lower layer of the detection equipment bracket also includes a servo loading mechanism. An opening is set at the rotating disk corresponding to the tooling positioning seat, and the servo loading mechanism abuts against the piston rod of the brake master cylinder on the tooling positioning seat through the setting of the opening; a tightening mechanism is set on the fixed disk according to the position distribution of each detection component, and the tightening mechanism and the servo loading mechanism apply force to the brake master cylinder on the tooling positioning seat from top to bottom.

3. A brake master cylinder performance testing device according to claim 1, characterized in that: A liquid inlet blocking mechanism is arranged on the fixed plate, and is arranged at a corresponding position according to the detection requirements of each detection component; a liquid discharge port blocking mechanism is arranged at a corresponding position on the upper layer of the detection equipment bracket; sensors are arranged on the plugs of the liquid inlet blocking mechanism and the liquid discharge port blocking mechanism according to the corresponding detection requirements; The fixed disk is also provided with a corresponding air source component, which is connected with the corresponding detection component.

4. A brake master cylinder performance testing device according to claim 3, characterized in that: The pre-installed detection component and the first pair of bowl sealing detection components include a liquid inlet blocking mechanism; The patency and empty stroke detection component, the vacuum dynamic sealing detection component and the low-pressure static sealing detection component include a liquid inlet blocking mechanism and a liquid outlet blocking mechanism.

5. A brake master cylinder performance testing device according to claim 4, characterized in that: The liquid inlet blocking mechanism includes a liquid inlet lateral moving structure and a liquid inlet longitudinal moving structure. The liquid inlet longitudinal moving structure is connected to the servo loading mechanism. The liquid inlet lateral moving structure realizes the movement of the lateral moving structure by setting a corresponding liquid inlet slideway through the liquid inlet middleware. The liquid inlet blocking head is set on the liquid inlet lateral moving structure. A liquid inlet communication hole is provided between the liquid inlet plugging head, the liquid inlet lateral movement structure, the liquid inlet longitudinal movement structure and the liquid inlet middle piece; The liquid inlet longitudinal moving structure is connected with the air source component.

6. A brake master cylinder performance testing device according to claim 4, characterized in that: The drain port plugging mechanism includes a drain port transverse moving structure, a drain port longitudinal moving structure and a drain port plugging frame; the drain port longitudinal moving structure is arranged inside the drain port plugging frame, and the up and down movement is achieved by a screw rod; the drain port transverse moving structure is arranged outside the drain port plugging frame, and the movement is controlled by the drain port transverse motor, and the drain port transverse motor protects the corresponding wires and pipes through a drag chain; a drain port plugging head is arranged on the drain port transverse moving structure.

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