Brake foot valve function testing device

Abstract

The utility model provides a brake foot valve function testing device which is characterized in that a clamping mechanism is installed on a machine table through a Z-axis stroke executing mechanism, the Z-axis stroke executing mechanism drives the clamping mechanism to move on a Z axis, and a brake foot valve is clamped on the clamping mechanism and moves along with the clamping mechanism; the force measuring sensor is fixedly mounted on the rack and is positioned right above the brake foot valve on the clamping mechanism, and a probe of the force measuring sensor faces a brake ejector rod on the brake foot valve; the control unit is connected with the Z-axis stroke executing mechanism and the force measuring sensor, the control unit controls the Z-axis stroke executing mechanism to drive the clamping mechanism to move upwards, a brake ejector rod on the brake foot valve is made to be tightly pressed on a probe of the force measuring sensor, and the probe of the force measuring sensor monitors braking force of the brake ejector rod in real time and transmits braking force data to the control unit. The device is compact in structure and high in automation degree, and can realize the automatic test of the stroke-braking force of the automatic ejector rod on the brake foot valve.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile brake foot valve, especially relates to a brake foot valve function testing device. BACKGROUND

[0002] The brake foot valve is a kind of brake valve applied to vehicle braking, and the brake jack is an indispensable component in brake foot valve, which can convert pedal braking force into jack downstroke, and further adjust the pressure of each wheel braking system of vehicle.The brake foot valve is directly related to the stability and safety of vehicle braking, so the valve must be tested whether its braking function meets product requirements before product delivery, and the downstroke of detection valve body brake jack needs to be controlled and the braking force of brake jack is detected during the testing process.Currently, there are related testing devices for detecting the downstroke and braking force of brake jack of brake foot valve, but these devices are complex in structure, large in space occupation and low in automation degree. SUMMARY

[0003] The utility model provides a brake foot valve function testing device, and the device is compact in structure, high in automation degree, can realize the automatic test of automatic jack stroke-braking force on brake foot valve, and the testing process is simple and convenient.

[0004] The technical scheme adopted in the utility model to achieve the above-mentioned purposes is as follows:

[0005] A brake foot valve function testing device at least includes a machine table, and the brake foot valve function testing device further includes:

[0006] A clamping mechanism is installed on the machine table through a Z-axis stroke execution mechanism, moves on the Z-axis through the Z-axis stroke execution mechanism, and the brake foot valve is clamped on the clamping mechanism and moves with the clamping mechanism;

[0007] A force sensor is fixedly installed on the rack and located directly above the brake foot valve on the clamping mechanism, and the probe of the force sensor faces the brake jack on the brake foot valve;

[0008] A control unit is connected with the Z-axis stroke execution mechanism and the force sensor respectively, controls the Z-axis stroke execution mechanism to drive the clamping mechanism to move upwards, makes the brake jack on the brake foot valve press tightly on the probe of the force sensor, and the probe of the force sensor monitors the braking force of the brake jack in real time and transmits the braking force data to the control unit.

[0009] The Z-axis stroke execution mechanism at least comprises a Z-axis driving motor, which is a servo driving motor with an encoder, and a control unit connected with the Z-axis driving motor and the encoder, the control unit controls the rotation of the Z-axis driving motor to drive the clamping mechanism to move upward, and the control unit monitors the rotation position signal fed back by the encoder in real time to receive the stroke data of the brake top rod on the brake foot valve in real time.

[0010] The machine table comprises an upper platform, a frame, a stand and a lower platform, wherein the upper platform is fixed on the frame, and the lower platform is fixedly connected to the bottom of the upper platform through the stand.

[0011] The Z-axis stroke execution mechanism comprises a transmission screw rod, a Z-axis stroke driving assembly, a moving top rod and a moving platform, wherein the bottom of the transmission screw rod is vertically installed on the lower platform through a rolling bearing, and the bottom end of the transmission screw rod extends from the bottom of the lower platform, the Z-axis stroke driving assembly is installed at the bottom end of the transmission screw rod and fixed on the lower platform, and the Z-axis stroke driving assembly drives the screw nut on the transmission screw rod to move linearly, the lower part of the moving top rod is a hollow tubular structure, the lower part of the moving top rod is sleeved on the transmission screw rod and fixedly connected with the screw nut on the transmission screw rod, the upper part of the moving top rod penetrates through the upper platform and connected with the upper platform through a top rod shaft sleeve, the moving top rod moves along with the screw nut on the Z-axis, and the moving platform is fixed on the upper end of the moving top rod and moves along with the moving top rod, and the clamping mechanism is installed on the moving platform to move along with the moving platform on the Z-axis.

[0012] The upper platform is symmetrically provided with sliding shafts vertically arranged on both sides of the moving top rod, the moving top rod is fixed with a moving cross beam, and the both ends of the moving cross beam are sleeved on the sliding shafts on both sides and slide up and down along the sliding shafts.

[0013] The machine table is provided with a Z-axis stroke limiting mechanism, which comprises a stroke limiting block, a C-shaped support, a limiting sliding shaft, an upper limiting shaft sleeve, a lower limiting shaft sleeve, an upper adjusting compression spring, a lower adjusting compression spring, an upper spring stop ring, a lower spring stop ring, an upper limiting proximity switch, a lower limiting proximity switch and a limiting sensing block, wherein the stroke limiting block is fixed on the side surface of the moving cross beam by bolts and moves together with the moving cross beam on the Z-axis, the upper plane of the C-shaped support is fixed on the bottom of the upper platform, the limiting sliding shaft vertically penetrates the stroke limiting block, the upper platform and the C-shaped support and is in sliding connection with the stroke limiting block, the upper platform and the C-shaped support, the upper limiting shaft sleeve and the lower limiting shaft sleeve are locked and fixed on the limiting sliding shaft and are located at the upper and lower parts of the stroke limiting block respectively, the upper adjusting compression spring and the lower adjusting compression spring are sleeved on the limiting sliding shaft and are located at the upper and lower parts of the lower plane of the C-shaped support respectively, the upper spring stop ring and the lower spring stop ring are locked on the limiting sliding shaft and compress and lock the upper adjusting compression spring and the lower adjusting compression spring respectively against the lower plane of the C-shaped support, and the upper limiting proximity switch and the lower limiting proximity switch are installed on the side surface of the C-shaped support and are both directed to the limiting sliding shaft, and the limiting sensing block is fixedly connected to the limiting sliding shaft and is located between the upper limiting proximity switch and the lower limiting proximity switch.

[0014] The upper limiting proximity switch and the lower limiting proximity switch are connected with the control unit respectively, and when the upper limiting proximity switch and the lower limiting proximity switch detect the signal of the limiting sensing block, the control unit receives the signal, alarms and protects the stop.

[0015] The bottom of the clamping mechanism is provided with an XY-axis position adjusting mechanism, which adjusts the XY-axis position of the clamping mechanism.

[0016] The clamping mechanism is an automatic centering clamp, which comprises a mounting base, a fixed side bearing seat, a supporting side bearing seat, left and right rotating lead screws, a clamping drive motor, a left clamping block and a right clamping block, wherein the mounting base is fixed on the XY-axis position adjusting mechanism, the fixed side bearing seat and the supporting side bearing seat are fixed on the two sides of the mounting base respectively, the two ends of the left and right rotating lead screws are installed on the fixed side bearing seat and the supporting side bearing seat through the fixed side bearing and the supporting side bearing respectively, the clamping drive motor is connected with one end of the left and right rotating lead screws close to the fixed side bearing seat through a shaft coupler, the clamping drive motor drives the left and right rotating lead screws to rotate forward or reversely, thereby driving the left nut and the right nut on the left and right rotating lead screws to approach or move away from each other, and the left clamping block and the right clamping block are fixedly connected with the left nut and the right nut on the left and right rotating lead screws respectively, and a groove for clamping the brake foot valve is formed between the left clamping block and the right clamping block.

[0017] The clamping drive motor is connected with the control unit, and the rotation of the clamping drive motor is controlled through the control unit to realize the automatic clamping of the brake foot valve.

[0018] Compared with the prior art, the brake foot valve function test device has the following advantages: 1, the brake foot valve function test device provided by the utility model comprises a clamping mechanism, a Z-axis stroke execution mechanism, a force sensor and a control unit, can realize automatic clamping of the brake foot valve, can realize automatic test of the automatic ejector rod stroke-brake force on the brake foot valve, thereby test the qualification of the brake function of the brake foot valve, the device is high in automation degree and simple and convenient in test process.

[0019] 2, the brake foot valve function test device provided by the utility model is compact and stable in structure, and stability of test is ensured.

[0020] 3, the utility model discloses a Z-axis stroke limiting mechanism is arranged, realizes Z-axis stroke limiting protection, avoids damaging the test product.

[0021] 4, the utility model discloses further provide XY axis position adjusting mechanism, the XY axis position of clamping mechanism is adjusted, ensure that the brake ejector rod on the brake foot valve is just pressed on the probe of force sensor after moving up. DRAWINGS

[0022] Figure 1 The structural diagram of the brake foot valve function test device provided by the utility model is provided;

[0023] Figure 2 The structural diagram of the brake foot valve function test device provided by the utility model is provided;

[0024] Figure 3 The partial front view of the brake foot valve function test device provided by the utility model is provided;

[0025] Figure 4 The sectional view of the Z-axis stroke execution mechanism in the utility model is provided;

[0026] Figure 5 The structural diagram of the XY axis position adjusting mechanism in the utility model is provided;

[0027] Figure 6 The structural diagram of the clamping mechanism installed on the XY axis position adjusting mechanism in the utility model is provided;

[0028] Figure 7 The structural diagram of the clamping mechanism in the utility model is provided;

[0029] Figure 8 The structural diagram of the Z-axis stroke limiting mechanism in the utility model is provided;

[0030] Figure 9 The control block diagram of the brake foot valve function test device provided by the utility model is provided;

[0031] In the figure: 1- machine table, 101- upper platform, 102- rack, 103- caster, 104- column, 105- lower platform;

[0032] 2- Z-axis stroke execution mechanism, 201- transmission screw rod, 202- rolling bearing, 203- screw nut, 204- moving top rod, 205- top rod shaft sleeve, 206- moving platform, 207- sliding shaft, 208- moving crossbeam, 209- Z-axis drive motor, 210- drive synchronous pulley, 211- driven synchronous pulley, 212- synchronous belt, 213- sliding shaft sleeve;

[0033] 3- XY-axis position adjusting mechanism;

[0034] 4- clamping mechanism, 401- mounting base, 402- fixed side bearing seat, 403- supporting side bearing seat, 404- left and right screw rod, 405- fixed side bearing, 406- supporting side bearing, 407- clamping drive motor, 408- shaft coupling, 409- left nut, 410- right nut, 411- left clamping block, 412- right clamping block, 413- guide rail, 414- left sliding block, 415- right sliding block;

[0035] 5- Z-axis stroke limiting mechanism, 501- stroke limiting block, 502- C-shaped support, 503- limiting sliding shaft, 504- upper limiting shaft sleeve, 505- lower limiting shaft sleeve, 506- upper adjusting compression spring, 507- lower adjusting compression spring, 508- upper spring retainer ring, 509- lower spring retainer ring, 510- upper limiting proximity switch, 511- lower limiting proximity switch, 512- limiting sensing block, 513- hexagonal nut with hole, 514- locking nut;

[0036] 6- force sensor, 7- brake foot valve, 701- brake top rod, 8- fixed crossbeam. DETAILED DESCRIPTION

[0037] The utility model will be explained in detail below in combination with the drawings.

[0038] The structure of the brake foot valve function test device provided by the embodiment is shown in the figure Figure 1 , which comprises a machine table 1, a Z-axis stroke execution mechanism 2, an XY-axis position adjusting mechanism 3, a clamping mechanism 4, a Z-axis stroke limiting mechanism 5, a force sensor 6, and a control unit. The structure of the brake foot valve to be tested is shown in the figure Figure 2 .

[0039] The clamping mechanism is installed on the machine table through the XY axis position adjusting mechanism and the Z axis stroke executing mechanism. The XY axis position of the clamping mechanism is adjusted through the XY axis position adjusting mechanism. The clamping mechanism is moved on the Z axis through the Z axis stroke executing mechanism. The brake foot valve 7 is clamped on the clamping mechanism and moves with the clamping mechanism. Specifically, the Z axis stroke executing mechanism is installed on the machine table. The XY axis position adjusting mechanism is installed on the Z axis stroke executing mechanism and moves with the Z axis stroke executing mechanism on the Z axis. The clamping mechanism is installed on the XY axis position adjusting mechanism and moves with the XY axis position adjusting mechanism on the XY axis. The force sensor is fixedly installed on the rack and located directly above the brake foot valve on the clamping mechanism. The probe of the force sensor faces the brake top rod 701 on the brake foot valve.

[0040] In the embodiment, the machine table includes an upper platform 101, a rack 102 and casters 103, as shown in Figure 1 The rack is a cuboid frame structure. The upper platform is horizontally fixed on the rack through bolts. The casters are installed at the bottom of the rack to facilitate the movement of the entire device. Specifically, the bottom of the upper platform is connected with a lower platform 105 for installing the Z axis stroke executing mechanism through a stand column 104. Further, four stand columns are provided. The top ends of the stand columns are fixedly connected with the upper platform through bolts. The bottom ends of the stand columns are fixedly connected with the lower platform through bolts.

[0041] The Z axis stroke executing mechanism includes a transmission screw rod 201, a Z axis stroke driving assembly, a moving top rod 204 and a moving platform 206, as shown in Figure 1 、 Figure 3 and Figure 4As shown in the figure, the bottom of the transmission screw rod is vertically installed on the lower platform through the rolling bearing 202, and the bottom end of the transmission screw rod extends from the bottom of the lower platform, the Z-axis stroke driving assembly is installed on the bottom end of the transmission screw rod and fixed on the lower platform, and the Z-axis stroke driving assembly drives the screw nut 203 on the transmission screw rod to move linearly; specifically, the rolling bearing is installed in the bearing hole of the lower platform through tight fitting, and the transmission screw rod is installed in the rolling bearing and extends out of the lower platform. The lower part of the moving top rod is a hollow tubular structure, the lower part of the moving top rod is sleeved on the transmission screw rod and fixedly connected with the screw nut on the transmission screw rod, the upper part of the moving top rod penetrates through the upper platform and is connected with the upper platform through the top rod shaft sleeve 205, and the moving top rod moves with the screw nut in the Z-axis; specifically, the top rod shaft sleeve is fixed on the upper platform through bolts, and the moving top rod is installed in the top rod shaft sleeve. The moving platform is fixed on the upper end of the moving top rod and moves with the moving top rod, and the moving platform is used for the installation of the later XY-axis position adjusting mechanism and clamping mechanism. In this embodiment, vertical sliding shafts 207 are symmetrically installed on the upper platform on both sides of the moving top rod, a moving cross beam 208 is fixed on the moving top rod, and the two ends of the moving cross beam are sleeved on the sliding shafts on both sides and slide up and down along the sliding shafts; specifically, the moving cross beam is fixed on the top end of the moving top rod, and the moving platform is fixed on the moving cross beam; further, the two ends of the moving cross beam are sleeved on the sliding shafts on both sides through the sliding shaft sleeves 213. Preferably, the Z-axis stroke driving assembly comprises a Z-axis driving motor 209, a driving synchronous pulley 210, a driven synchronous pulley 211 and a synchronous belt 212, wherein the Z-axis driving motor is installed on the lower platform, the driving synchronous pulley is connected to the driving shaft of the Z-axis driving motor, the driven synchronous pulley is connected to the bottom end of the transmission screw rod, the synchronous belt is connected to the driving synchronous pulley and the driven synchronous pulley, the Z-axis driving motor drives the driving synchronous pulley to rotate, the driven synchronous pulley rotates synchronously under the driving of the synchronous belt, thereby driving the transmission screw rod to rotate.

[0042] In this embodiment, the XY-axis position adjusting mechanism is fixedly installed on the moving platform of the Z-axis stroke driving assembly by bolts, and is preferably an XY-axis precision displacement platform. Figure 5 As shown in the figure, the XY-axis precision displacement platform is a conventional structure, which will not be described in detail here.

[0043] In this embodiment, the clamping mechanism is fixedly installed on the XY-axis position adjusting mechanism by bolts, as shown in the figure. Figure 6 As shown in the figure, the clamping mechanism is an automatic centering clamp, and its structure is as shown in the figure. Figure 7As shown, the automatic centering clamp comprises a mounting base 401, a fixed side bearing seat 402, a supporting side bearing seat 403, a left-right rotating screw rod 404, a clamping drive motor 407, a left clamping block 411, a right clamping block 412, a guide rail 413, a left sliding block 414 and a right sliding block 415, wherein the mounting base is fixed on the XY axis position adjusting mechanism, the fixed side bearing seat and the supporting side bearing seat are respectively fixed on the two sides of the mounting base, the two ends of the left-right rotating screw rod are respectively installed on the fixed side bearing seat and the supporting side bearing seat through the fixed side bearing 405 and the supporting side bearing 406, the clamping drive motor is connected with one end of the left-right rotating screw rod close to the fixed side bearing seat through a shaft coupler 408, the clamping drive motor drives the left-right rotating screw rod to rotate forward or reversely, thereby driving the left nut 409 and the right nut 410 on the left-right rotating screw rod to move close to or away from each other. Specifically, the mounting base is in the shape of inverted L as a whole, the side surface of the mounting base is provided with a mounting hole, the clamping drive motor is fixedly connected to the side surface of the mounting base, and the drive shaft of the clamping drive motor penetrates through the mounting hole in the side surface of the mounting base and is connected with the left-right rotating screw rod, thereby ensuring stable installation of the clamping drive motor. The left clamping block and the right clamping block are fixedly connected with the left nut and the right nut on the left-right rotating screw rod, and together form a groove for clamping the brake foot valve between the left clamping block and the right clamping block, see Figure 6 ; specifically, the groove formed between the left clamping block and the right clamping block matches the bottom structure of the brake foot valve, thereby ensuring stable clamping of the brake foot valve between the left clamping block and the right clamping block. The guide rail is fixed on the mounting base and located below the left-right rotating screw rod, the left sliding block and the right sliding block are installed on the guide rail and slide along the guide rail respectively, and specifically, the guide rail is a dovetail groove guide rail. The left sliding block and the right sliding block are fixedly connected with the left clamping block and the right clamping block respectively, and the left sliding block and the right sliding block move along the guide rail when the left clamping block and the right clamping block move with the left nut and the right nut. The left-right rotating screw rod is a conventional screw rod structure, which will not be described in detail here.

[0044] In this embodiment, the force sensor is installed on the rack through the fixed cross beam 8, see Figure 1 . Specifically, the top of the two sliding shafts is connected with the fixed cross beam, and the force sensor is fixedly installed on the fixed cross beam and faces the brake foot valve on the clamping mechanism.

[0045] The Z-axis stroke limiting mechanism comprises a stroke limiting block 501, a C-shaped support 502, a limiting sliding shaft 503, an upper limiting shaft sleeve 504, a lower limiting shaft sleeve 505, an upper adjusting compression spring 506, a lower adjusting compression spring 507, an upper spring retainer 508, a lower spring retainer 509, an upper limiting proximity switch 510, a lower limiting proximity switch 511 and a limiting sensing block 512, as shown in Figure 8The travel limiting block is fixed on the side of the moving cross beam by a bolt and moves with the moving cross beam on the Z axis, the upper plane of the C-shaped support is fixed on the bottom of the upper platform, specifically, the C-shaped support is connected with the upper platform through the hexagonal nut with hole 513 and the locking nut 514; further, the upper plane of the C-shaped support and the upper platform are both provided with through holes, the hexagonal nut with hole passes through the through holes of the upper plane of the C-shaped support and the upper platform, and is then fastened and fixed by the locking nut. The limiting sliding shaft vertically passes through the travel limiting block, the upper platform and the C-shaped support, and is in sliding connection with the travel limiting block, the upper platform and the C-shaped support; specifically, the limiting sliding shaft passes through the sliding inner hole provided on the hexagonal nut with hole, so as to pass through the upper plane of the C-shaped support and the upper platform. The upper limiting shaft sleeve and the lower limiting shaft sleeve are locked and fixed on the limiting sliding shaft and are located at the upper and lower parts of the travel limiting block, specifically, the upper limiting shaft sleeve and the lower limiting shaft sleeve are both provided with an inner hole matched with the limiting sliding shaft and a locking top wire, the upper limiting shaft sleeve and the lower limiting shaft sleeve are respectively sleeved on the limiting sliding shaft and are locked at the limiting points on the upper and lower sides of the travel limiting block. The upper adjusting compression spring and the lower adjusting compression spring are both sleeved on the limiting sliding shaft and are located at the upper and lower parts of the lower plane of the C-shaped support, the upper spring retainer and the lower spring retainer are locked on the limiting sliding shaft and compressively lock the upper adjusting compression spring and the lower adjusting compression spring against the lower plane of the C-shaped support; specifically, the upper spring retainer and the lower spring retainer are both provided with an inner hole matched with the limiting sliding shaft and a locking top wire, the upper spring retainer and the lower spring retainer are locked after compressing the upper adjusting compression spring and the lower adjusting compression spring, respectively, and the upper adjusting compression spring and the lower adjusting compression spring jointly act on the limiting sliding shaft to make the limiting sliding shaft be at the initial setting position in the free state and be movable up and down in the limiting stressed state. The upper limiting proximity switch and the lower limiting proximity switch are both installed on the side of the C-shaped support by a bolt and are both towards the limiting sliding shaft, the limiting sensing block is fixedly connected on the limiting sliding shaft and is located between the upper limiting proximity switch and the lower limiting proximity switch, specifically, the limiting sensing block is provided with an inner hole matched with the limiting sliding shaft and a locking top wire, and the limiting sensing block can be locked and fixed at the required position of the limiting sliding shaft. In the initial state, the limiting sensing block is adjusted to be located at the intermediate position of the upper limiting proximity switch and the lower limiting proximity switch, and the upper limiting shaft sleeve and the lower limiting shaft sleeve are adjusted to be located at the required travel limiting position, when the travel limiting block moves up and down to the upper and lower limiting positions along with the Z axis travel execution mechanism, the travel limiting block contacts and drives the upper limiting shaft sleeve or the lower limiting shaft sleeve to move, the limiting sliding shaft and the limiting sensing block fixed on the limiting sliding shaft also move, upward movement causes the upper limiting proximity switch to receive a signal, and downward movement causes the lower limiting proximity switch to receive a signal.

[0046] In the embodiment, the clamping drive motor of the clamping mechanism, the Z axis drive motor of the Z axis travel limiting mechanism, the force sensor, and the upper limiting proximity switch and the lower limiting proximity switch of the Z axis travel limiting mechanism are connected with the control unit, respectively, as shown inFigure 9 The control unit includes a host computer, an industrial control host, and a servo driver; the host computer is signal-connected with the industrial control host, the industrial control host is electrically connected with the servo driver, the servo driver is electrically connected with the clamping drive motor and the Z-axis drive motor respectively, and the force sensor is connected with the industrial control host; the industrial control host controls the clamping drive motor and the Z-axis drive motor to work through the servo driver, so as to realize automatic clamping of the brake foot valve and drive the brake foot valve to move upward until the brake rod on the brake foot valve is pressed on the probe of the force sensor, the probe of the force sensor monitors the brake force of the brake rod in real time and transmits the brake force data to the industrial control host. Preferably, the Z-axis drive motor is a servo drive motor with an encoder, the industrial control host of the control unit is connected with the encoder, and the rotation position signal of the Z-axis drive motor fed back by the encoder is monitored in real time, so that the stroke data of the brake rod on the brake foot valve are received in real time. The industrial control host receives the stroke-brake force data of the brake rod and determines whether the brake function of the brake foot valve is qualified, the host computer displays the stroke-brake force curve of the brake rod and displays whether the automatic function of the product is qualified. Specifically, the upper limit proximity switch and the lower limit proximity switch are connected with the industrial control host of the control unit respectively, when the upper limit proximity switch and the lower limit proximity switch detect the signal of the limit sensing block, the industrial control host alarms and protects shutdown.

[0047] Preferably, the clamping drive motor and the Z-axis drive motor are both servo drive motors, and the control unit can also monitor the input current and output current fed back by the motors in real time through the torque control mode of the servo motor, so as to monitor the torque of the clamping drive motor and the Z-axis drive motor, and prevent the output torque of the motor from being too large to damage the measured product or equipment.

Claims

1. A brake foot valve function testing device, comprising at least a machine base, characterized in that: The brake foot valve function testing device also includes: The clamping mechanism is mounted on the machine base via a Z-axis travel actuator. The Z-axis travel actuator drives the clamping mechanism to move along the Z-axis. The brake foot valve is clamped onto the clamping mechanism and moves with the clamping mechanism. The force sensor is fixedly mounted on the frame and located directly above the brake foot valve on the clamping mechanism, with the probe of the force sensor facing the brake push rod on the brake foot valve. The control unit is connected to the Z-axis travel actuator and the force sensor. The control unit controls the Z-axis travel actuator to move the clamping mechanism upward, so that the brake push rod on the brake foot valve presses against the probe of the force sensor. The probe of the force sensor monitors the braking force of the brake push rod in real time and transmits the braking force data to the control unit.

2. The brake foot valve function testing device according to claim 1, characterized in that: The Z-axis travel actuator includes at least a Z-axis drive motor, which is a servo drive motor with an encoder. The control unit is connected to the Z-axis drive motor and the encoder respectively. The control unit controls the Z-axis drive motor to rotate, so that the Z-axis travel actuator drives the clamping mechanism to move upward. Meanwhile, the control unit monitors the rotational position signal fed back by the encoder in real time, thereby receiving the stroke data of the brake push rod on the brake foot valve in real time.

3. The brake foot valve function testing device according to claim 1, characterized in that: The machine includes an upper platform, a frame, a column, and a lower platform, wherein the upper platform is fixed to the frame, and the lower platform is fixedly connected to the bottom of the upper platform through the column.

4. The brake foot valve function testing device according to claim 3, characterized in that: The Z-axis stroke actuator includes a transmission screw, a Z-axis stroke drive assembly, a movable push rod, and a movable platform. The bottom of the transmission screw is vertically mounted on the lower platform via a rolling bearing, and the bottom end of the transmission screw extends from the bottom of the lower platform. The Z-axis stroke drive assembly is mounted on the bottom end of the transmission screw and fixed on the lower platform. The Z-axis stroke drive assembly drives the screw nut on the transmission screw to move linearly. The lower part of the movable push rod is a hollow tubular structure. The lower part of the movable push rod is sleeved on the transmission screw and fixedly connected to the screw nut on the transmission screw. The upper part of the movable push rod passes through the upper platform and is connected to the upper platform through the push rod bushing. The movable push rod moves along the Z-axis with the screw nut. The movable platform is fixed to the upper end of the movable push rod and moves with the movable push rod. The clamping mechanism is installed on the movable platform and thus moves along the Z-axis with the movable platform.

5. The brake foot valve function testing device according to claim 4, characterized in that: The upper platform is symmetrically equipped with vertically arranged sliding shafts on both sides of the movable top rod. A movable crossbeam is fixed on the movable top rod, and the two ends of the movable crossbeam are sleeved on the sliding shafts on both sides and slide up and down along the sliding shafts.

6. The brake foot valve function testing device according to claim 5, characterized in that: The machine base is equipped with a Z-axis travel limit mechanism, which includes a travel limit block, a C-shaped bracket, a limit sliding shaft, an upper limit bushing, a lower limit bushing, an upper adjusting compression spring, a lower adjusting compression spring, an upper spring retaining ring, a lower spring retaining ring, an upper limit proximity switch, a lower limit proximity switch, and a limit sensing block. The travel limit block is bolted to the side of the moving crossbeam and moves along the Z-axis with the moving crossbeam. The upper surface of the C-shaped bracket is fixed to the bottom of the upper platform. The limit sliding shaft vertically passes through the travel limit block, the upper platform, and the C-shaped bracket, and the limit sliding shaft is slidably connected to all three components. Next, the upper limit sleeve and the lower limit sleeve are locked and fixed on the limit sliding shaft and are located at the upper and lower parts of the travel limit block, respectively. The upper adjustment compression spring and the lower adjustment compression spring are both sleeved on the limit sliding shaft and are located at the upper and lower parts of the lower plane of the C-shaped bracket, respectively. The upper spring retaining ring and the lower spring retaining ring are locked on the limit sliding shaft and compress and lock the upper adjustment compression spring and the lower adjustment compression spring against the lower plane of the C-shaped bracket, respectively. The upper limit proximity switch and the lower limit proximity switch are both installed on the side of the C-shaped bracket and face the limit sliding shaft. The limit sensing block is fixedly connected to the limit sliding shaft and is located between the upper limit proximity switch and the lower limit proximity switch.

7. The brake foot valve function testing device according to claim 6, characterized in that: The upper limit proximity switch and the lower limit proximity switch are respectively connected to the control unit. When the upper limit proximity switch and the lower limit proximity switch detect the signal of the limit sensing block, the control unit receives the signal, alarms, and stops the machine for protection.

8. The brake foot valve function testing device according to claim 1, characterized in that: The bottom of the clamping mechanism is equipped with an XY axis position adjustment mechanism to adjust the XY axis position of the clamping mechanism.

9. The brake foot valve function testing device according to claim 1, characterized in that: The clamping mechanism is an automatic centering clamp, which includes a mounting base, a fixed-side bearing seat, a supporting-side bearing seat, left and right spiral screws, a clamping drive motor, a left clamping block, and a right clamping block. The mounting base is fixed to the XY-axis position adjustment mechanism. The fixed-side bearing seat and the supporting-side bearing seat are respectively fixed to both sides of the mounting base. The two ends of the left and right spiral screws are respectively mounted on the fixed-side bearing seat and the supporting-side bearing seat through the fixed-side bearing and the supporting-side bearing, respectively. The clamping drive motor is connected to the end of the left and right spiral screws near the fixed-side bearing seat through a shaft coupling. The clamping drive motor drives the left and right spiral screws to rotate in the forward or reverse direction, thereby causing the left and right nuts on the left and right spiral screws to move closer or further apart. The left clamping block and the right clamping block are fixedly connected to the left and right nuts on the left and right spiral screws, respectively, and a groove for clamping the brake foot valve is formed between the left and right clamping blocks.

10. The brake foot valve function testing device according to claim 9, characterized in that: The clamping drive motor is connected to the control unit, and the control unit controls the rotation of the clamping drive motor to achieve automatic clamping of the brake foot valve.

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