Automatic centering clamp of brake foot valve function testing device

Abstract

The utility model provides an automatic centering clamp of a brake foot valve function testing device, which comprises a left clamping block, a right clamping block, a mounting base, a fixed side bearing seat, a supporting side bearing seat, a left-hand screw rod, a right-hand screw rod and a clamping driving motor, and is characterized in that the fixed side bearing seat and the supporting side bearing seat are fixed on two sides of the mounting base; the two ends of the left-right-handed screw rod are rotationally installed on the fixed side bearing seat and the supporting side bearing seat, the clamping driving motor is fixedly connected with the end, close to the fixed side bearing seat, of the left-right-handed screw rod, and the clamping driving motor drives the left-right-handed screw rod to rotate forwards or reversely to drive a left nut and a right nut on the left-right-handed screw rod to be close to each other or away from each other; the left clamping block and the right clamping block are fixedly connected with the left nut and the right nut respectively, and a groove used for clamping the brake foot valve is jointly formed between the left clamping block and the right clamping block. According to the automatic centering clamp, the brake foot valve can be automatically centered and clamped, clamping is convenient and fast, and the clamping stability is good.

Description

Technical Field

[0001] This utility model relates to the field of automotive brake foot valve technology, and in particular to an automatic centering fixture for a brake foot valve function testing device. Background Technology

[0002] The brake foot valve is a type of brake valve used in vehicle braking. The brake push rod is an indispensable component of the brake foot valve. The brake push rod converts the braking force from the pedal into a downward stroke, thereby regulating the braking pressure of each wheel. The brake foot valve directly affects the stability and safety of vehicle braking; therefore, its braking function must be tested before the product leaves the factory to ensure it meets product requirements. This testing process requires controlling the downward stroke of the brake push rod and testing the braking force of the push rod. When performing functional testing on the brake foot valve, it must first be secured with bolts, which makes installation and fixation inconvenient. Summary of the Invention

[0003] This utility model provides an automatic centering fixture for a brake foot valve function testing device. The automatic centering fixture can automatically center and clamp the brake foot valve, which is convenient and quick to install and has good clamping stability.

[0004] The technical solution adopted to achieve the above-mentioned objectives of this utility model is as follows:

[0005] An automatic centering fixture for a brake foot valve function testing device includes at least a left clamping block and a right clamping block. The automatic centering fixture also includes a mounting base, a fixed-side bearing seat, a supporting-side bearing seat, left and right rotating screws, and a clamping drive motor. 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 rotating screws are rotatably mounted on the fixed-side bearing seat and the supporting-side bearing seat. The clamping drive motor is fixedly connected to the end of the left and right rotating screws near the fixed-side bearing seat. The clamping drive motor drives the left and right rotating screws to rotate in the forward or reverse direction, thereby causing the left and right nuts on the left and right rotating screws to move closer to or further away from each other. The left clamping block and the right clamping block are respectively fixedly connected to the left and right nuts on the left and right rotating screws, and a groove for clamping the brake foot valve is formed between the left and right clamping blocks.

[0006] A guide rail is fixed on the mounting base below the left and right screws, and a left slider and a right slider are mounted on the guide rail. The left slider and the right slider are fixedly connected to the left clamping block and the right clamping block, respectively. When the left clamping block and the right clamping block move with the left nut and the right nut, the left slider and the right slider move along the guide rail, respectively.

[0007] The guide rail is a dovetail groove guide rail.

[0008] The clamping drive motor is connected to the left and right lead screws via a shaft coupling.

[0009] The mounting base is generally in the shape of an inverted L. The side of the mounting base is provided with mounting holes. The clamping drive motor is fixedly connected to the side of the mounting base, and the drive shaft of the clamping drive motor passes through the mounting holes on the side of the mounting base.

[0010] The two ends of the left and right spiral screws are rotatably mounted on the fixed-side bearing seat and the support-side bearing seat respectively through the fixed-side bearing and the support-side bearing seat.

[0011] The groove formed between the left and right clamping blocks matches the bottom structure of the brake foot valve.

[0012] The clamping drive motor is connected to the control unit of the brake foot valve function testing device. The control unit controls the rotation of the clamping drive motor to realize the automatic clamping and releasing of the brake foot valve.

[0013] Compared with the prior art, the automatic centering fixture of the brake foot valve function testing device provided by this utility model has the following advantages: 1. The automatic centering fixture provided by this utility model is matched with the structure of the brake foot valve and can automatically center and clamp the brake foot valve, making clamping convenient and quick.

[0014] 2. The automatic centering fixture provided by this utility model installs the left clamping block and the right clamping block on the left and right screw rods, respectively. By rotating the left and right screw rods in both directions, the left and right clamping blocks are aligned to be close to or away from the brake release valve. The automatic centering fixture has a simple and compact structure.

[0015] 3. The automatic centering fixture provided by this utility model fixes the left clamping block and the right clamping block to the left slider and the right slider on the slide rail, respectively. When the left clamping block and the right clamping block move with the left nut and the right nut, the left slider and the right slider move along the guide rail, respectively, to ensure the stability of the left clamping block and the right clamping block during the movement process, thereby ensuring the clamping stability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the automatic centering fixture in this utility model;

[0017] Figure 2 This is a cross-sectional view of the automatic centering fixture of this utility model;

[0018] Figure 3 This is a schematic diagram of the brake foot valve.

[0019] Figure 4 This is a schematic diagram of the automatic centering fixture holding the brake foot valve in this utility model;

[0020] Figure 5 Structural diagram of the brake foot valve function testing device provided by this utility model;

[0021] Figure 6 A partial front view of the brake foot valve function testing device provided by this utility model;

[0022] Figure 7 This is a cross-sectional schematic diagram of the Z-axis stroke actuator in this utility model;

[0023] Figure 8 This is a schematic diagram of the Z-axis travel limiting mechanism in this utility model;

[0024] Figure 9 Control block diagram of the automatic centering fixture for the brake foot valve function testing device provided by this utility model;

[0025] In the diagram: 4-Automatic centering fixture, 401-Mounting base, 402-Fixed side bearing seat, 403-Support side bearing seat, 404-Left and right lead screws, 405-Fixed side bearing, 406-Support side bearing, 407-Clamping drive motor, 408-Coupling, 409-Left nut, 410-Right nut, 411-Left clamping block, 412-Right clamping block, 413-Guide rail, 414-Left slider, 415-Right slider; 7-Brake foot valve, 701-Brake push rod;

[0026] 1-Machine platform, 101-Upper platform, 102-Frame, 103-Casts, 104-Column, 105-Lower platform;

[0027] 2-Z-axis stroke actuator, 201-transmission screw, 202-rolling bearing, 203-screw nut, 204-moving push rod, 205-push rod bushing, 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 bushing;

[0028] 3-XY axis position adjustment mechanism;

[0029] 5-Z-axis travel limit mechanism, 501-travel limit block, 502-C-type bracket, 503-limit sliding shaft, 504-upper limit bushing, 505-lower limit bushing, 506-upper adjusting compression spring, 507-lower adjusting compression spring, 508-upper spring retaining ring, 509-lower spring retaining ring, 510-upper limit proximity switch, 511-lower limit proximity switch, 512-limit sensing block, 513-hexagonal nut with hole, 514-locking nut; 6-force sensor, 8-fixed crossbeam. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings.

[0031] The automatic centering fixture 4 of the brake foot valve function testing device provided in this embodiment has the following structure: Figure 1 and Figure 2 As shown, the system includes a mounting base 401, a fixed-side bearing seat 402, a supporting-side bearing seat 403, left and right spiral screws 404, a clamping drive motor 407, a left clamping block 411, a right clamping block 412, a guide rail 413, a left slider 414, and a right slider 415. 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 the two sides of the mounting base. The two ends of the left and right spiral screws are mounted on the fixed-side bearing seat and the supporting-side bearing seat through the fixed-side bearing 405 and the supporting-side bearing 406, 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 coupling 408. The clamping drive motor drives the left and right spiral screws to rotate in the forward or reverse direction, thereby causing the left nut 409 and the right nut 410 on the left and right spiral screws to move closer to each other or further away from each other. Specifically, the mounting base is generally L-shaped, with mounting holes on its side. The clamping drive motor is fixedly connected to the side of the mounting base, and its drive shaft passes through the mounting holes on the side of the mounting base, connecting to the left and right screw rods to ensure a secure installation. The left and right clamping blocks are fixedly connected to the left and right nuts on the left and right screw rods, respectively, and together they form a groove for clamping the brake foot valve 7. Figure 1 Specifically, the groove formed between the left and right clamping blocks matches the bottom structure of the brake foot valve, see... Figure 1 and Figure 3 Ensure the brake foot valve is securely clamped between the left and right clamping blocks, see... Figure 4 The guide rail is fixed to the mounting base and located below the left and right helical screws. The left and right sliders are mounted on the guide rail and slide along it respectively. Specifically, the guide rail is a dovetail groove guide rail. The left and right sliders are fixedly connected to the left and right clamping blocks respectively. When the left and right clamping blocks move with the left and right nuts, the left and right sliders move along the guide rail respectively. The aforementioned left and right helical screws are existing screw structures, and their structure is not described in detail here. In this embodiment, the clamping drive motor is connected to the control unit of the brake foot valve function testing device. The control unit controls the rotation of the clamping drive motor to realize the automatic clamping and releasing of the brake foot valve.

[0032] This embodiment also describes the overall structure of the brake foot valve function testing device. Besides the automatic centering fixture and control unit, the brake foot valve function testing device also includes a machine base 1, a Z-axis travel actuator 2, an XY-axis position adjustment mechanism 3, a Z-axis travel limit mechanism 5, and a force sensor 6. Its overall structure is as follows: Figure 5 and Figure 6 As shown.

[0033] The automatic centering fixture is mounted on the machine base via an XY-axis position adjustment mechanism and a Z-axis travel actuator. The XY-axis position adjustment mechanism adjusts the position of the automatic centering fixture along the XY-axis, and the Z-axis travel actuator moves the automatic centering fixture along the Z-axis. The brake foot valve is clamped onto the automatic centering fixture and moves with it. Specifically, the Z-axis travel actuator is mounted on the machine base, the XY-axis position adjustment mechanism is mounted on the Z-axis travel actuator and moves with it along the Z-axis, and the automatic centering fixture is mounted on the XY-axis position adjustment mechanism and moves along the XY-axis with it. A force sensor is fixedly mounted on the frame and located directly above the brake foot valve on the automatic centering fixture, with the sensor probe facing the brake rod 701 on the brake foot valve.

[0034] In this embodiment, the machine tool includes an upper platform 101, a frame 102, and casters 103. Figure 1 The frame is a rectangular parallelepiped structure, with the upper platform horizontally fixed to it by bolts. Casters are installed at the bottom of the frame for easy movement of the entire device. Specifically, the bottom of the upper platform is connected to a lower platform 105 for mounting the Z-axis travel actuator via columns 104. Furthermore, four columns are provided, with their top ends and bottom ends fixed to the upper platform and the lower platform respectively, all secured by bolts.

[0035] The Z-axis stroke actuator includes a transmission screw 201, a Z-axis stroke drive assembly, a movable push rod 204, and a movable platform 206, such as Figures 5-7As shown, the bottom of the transmission lead screw is vertically mounted on the lower platform via a rolling bearing 202, and the bottom end of the transmission lead screw extends from the bottom of the lower platform. The Z-axis stroke drive assembly is mounted on the bottom end of the transmission lead screw and fixed to the lower platform. The Z-axis stroke drive assembly drives the lead screw nut 203 on the transmission lead screw to move linearly. Specifically, the rolling bearing is tightly fitted into the bearing hole of the lower platform, and the transmission lead screw is installed in the rolling bearing and extends out of the lower platform. 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 lead screw and fixedly connected to the lead screw nut on the transmission lead screw. The upper part of the movable push rod passes through the upper platform and is connected to the upper platform via a push rod bushing 205. The movable push rod moves along the Z-axis with the lead screw nut. Specifically, the push rod bushing is fixed to the upper platform with bolts, and the movable push rod is installed inside the push rod bushing. The movable platform is fixed to the upper end of the movable push rod and moves with the movable push rod. The movable platform is used for the subsequent installation of the XY axis position adjustment mechanism and the automatic centering fixture. In this embodiment, vertically arranged sliding shafts 207 are symmetrically installed on both sides of the movable top rod on the upper platform. A movable crossbeam 208 is fixed on the movable top rod. 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. Specifically, the movable crossbeam is fixed to the top of the movable top rod, and the movable platform is fixed on the movable crossbeam. Further, the two ends of the movable crossbeam are sleeved on the sliding shafts on both sides through sliding shaft sleeves 213. Preferably, the Z-axis stroke drive assembly includes a Z-axis drive motor 209, a drive synchronous pulley 210, a driven synchronous pulley 211, and a synchronous belt 212. The Z-axis drive motor is installed on the lower platform. The drive synchronous pulley is connected to the drive shaft of the Z-axis drive motor. The driven synchronous pulley is connected to the bottom end of the transmission screw. The synchronous belt is connected to the drive synchronous pulley and the driven synchronous pulley. The Z-axis drive motor drives the drive synchronous pulley to rotate. Under the drive of the synchronous belt, the driven synchronous pulley rotates synchronously, thereby driving the transmission screw to rotate.

[0036] In this embodiment, the XY-axis position adjustment mechanism is fixedly mounted on the moving platform of the Z-axis travel actuator by bolts. Preferably, the XY-axis position adjustment mechanism is an XY-axis precision displacement platform, which is a conventional structure and will not be described in detail here. The automatic centering fixture is fixedly mounted on the XY-axis position adjustment mechanism by bolts.

[0037] In this embodiment, the force sensor is mounted on the frame via a fixed crossbeam 8. Figure 5 Specifically, a fixed crossbeam is connected to the top of the two sliding shafts, and a force sensor is fixedly installed on the fixed crossbeam and faces the brake foot valve on the automatic centering fixture.

[0038] The Z-axis travel limit mechanism includes a travel limit block 501, a C-shaped bracket 502, a limit sliding shaft 503, an upper limit bushing 504, a lower limit bushing 505, an upper adjusting compression spring 506, a lower adjusting compression spring 507, an upper spring retaining ring 508, a lower spring retaining ring 509, an upper limit proximity switch 510, a lower limit proximity switch 511, and a limit sensing block 512. Figure 8As shown. The travel limit block is fixed to the side of the moving crossbeam by bolts 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. Specifically, the C-shaped bracket and the upper platform are connected by a perforated hexagonal nut 513 and a locking nut 514. Further, both the upper surface of the C-shaped bracket and the upper platform are provided with through holes. The perforated hexagonal nut passes through the through holes of the upper surface of the C-shaped bracket and the upper platform, and is then tightened by the locking nut. The limiting sliding shaft passes vertically through the travel limit block, the upper platform, and the C-shaped bracket, and is slidably connected to the travel limit block, the upper platform, and the C-shaped bracket. Specifically, the limiting sliding shaft passes through the sliding inner hole provided on the perforated hexagonal nut, thereby passing through the upper platform and the upper surface of the C-shaped bracket. The upper limit sleeve and the lower limit sleeve are locked and fixed on the limiting sliding shaft and are located at the upper and lower parts of the travel limiting block, respectively. Specifically, the upper limit sleeve and the lower limit sleeve are provided with an inner hole that mates with the limiting sliding shaft and a locking screw. The upper limit sleeve and the lower limit sleeve are respectively sleeved on the limiting sliding shaft and locked at the limiting points on the upper and lower sides of the travel limiting block. Both the upper and lower adjusting compression springs are sleeved on the limiting sliding shaft, and are located at the upper and lower parts of the lower plane of the C-shaped bracket, respectively. The upper and lower spring retaining rings are locked on the limiting sliding shaft, and respectively compress and lock the upper and lower adjusting compression springs against the lower plane of the C-shaped bracket. Specifically, both the upper and lower spring retaining rings are provided with inner holes and locking screws that cooperate with the limiting sliding shaft. After the upper and lower spring retaining rings compress the upper and lower adjusting compression springs, they are locked. The upper and lower adjusting compression springs work together to keep the limiting sliding shaft in its initial setting position in a free state and able to move up and down under the limiting force state. Both the upper and lower limit proximity switches are bolted to 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 located between the upper and lower limit proximity switches. Specifically, the limit sensing block has an inner hole that mates with the limit sliding shaft and a locking screw, allowing it to be locked in place at the desired position on the limit sliding shaft. Initially, the limit sensing block is adjusted to the middle position between the upper and lower limit proximity switches, and the upper and lower limit bushings are adjusted to the desired travel limit positions. When the travel limit block moves up and down with the Z-axis travel actuator to the upper or lower limit positions, it contacts and drives the upper or lower limit bushing to move together. The limit sliding shaft and the limit sensing block fixed to it also move with it. Upward movement triggers a signal from the upper limit proximity switch, and downward movement triggers a signal from the lower limit proximity switch.

[0039] In this embodiment, the clamping drive motor of the automatic centering fixture, the Z-axis drive motor of the Z-axis travel limit mechanism, the force sensor, and the upper and lower limit proximity switches of the Z-axis travel limit mechanism are respectively connected to the control unit, such as... Figure 9 As shown; specifically, the control unit includes a host computer, an industrial control host, and a servo driver. The host computer is signal-connected to the industrial control host, the industrial control host is electrically connected to the servo driver, and the servo driver is electrically connected to the clamping drive motor and the Z-axis drive motor respectively. The force sensor is connected to the industrial control host. The industrial control host controls the clamping drive motor and the Z-axis drive motor through the servo driver to realize the automatic clamping of the brake foot valve and drive the brake foot valve to move upward until 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 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 to the encoder and monitors the rotational position signal of the Z-axis drive motor 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. The industrial control host receives the stroke-braking force data of the brake push rod and determines whether the braking function of the brake foot valve is qualified. The host computer displays the stroke-braking force curve of the brake push rod and indicates whether the automatic function of the product is qualified. Specifically, the upper limit proximity switch and the lower limit proximity switch are respectively connected to the industrial control host of the control unit. 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 stops the machine for protection.

[0040] Preferably, both the clamping drive motor and the Z-axis drive motor are servo drive motors. The control unit can also monitor the input and output current fed back by the motor in real time through the torque control method of the servo motor, thereby monitoring the torque of the clamping drive motor and the Z-axis drive motor and preventing the motor output torque from being too large and damaging the product or equipment under test.

Claims

1. An automatic centering fixture for a brake foot valve function testing device, comprising at least a left clamping block and a right clamping block, characterized in that: The automatic centering fixture also includes a mounting base, a fixed-side bearing seat, a supporting-side bearing seat, left and right spiral screws, and a clamping drive motor. The fixed-side bearing seat and the supporting-side bearing seat are fixed to both sides of the mounting base, and the two ends of the left and right spiral screws are rotatably mounted on the fixed-side bearing seat and the supporting-side bearing seat. The clamping drive motor is fixedly connected to the end of the left and right spiral screws near the fixed-side bearing seat. 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, and the left and right clamping blocks together form a groove for clamping the brake foot valve.

2. The automatic centering fixture of the brake foot valve function testing device according to claim 1, characterized in that: A guide rail is fixed on the mounting base below the left and right screws, and a left slider and a right slider are mounted on the guide rail. The left slider and the right slider are fixedly connected to the left clamping block and the right clamping block, respectively. When the left clamping block and the right clamping block move with the left nut and the right nut, the left slider and the right slider move along the guide rail, respectively.

3. The automatic centering fixture of the brake foot valve function testing device according to claim 2, characterized in that: The guide rail is a dovetail groove guide rail.

4. The automatic centering fixture of the brake foot valve function testing device according to claim 1, characterized in that: The clamping drive motor is connected to the left and right lead screws via a shaft coupling.

5. The automatic centering fixture of the brake foot valve function testing device according to claim 1, characterized in that: The mounting base is generally in the shape of an inverted L. The side of the mounting base is provided with mounting holes. The clamping drive motor is fixedly connected to the side of the mounting base, and the drive shaft of the clamping drive motor passes through the mounting holes on the side of the mounting base.

6. The automatic centering fixture of the brake foot valve function testing device according to claim 1, characterized in that: The two ends of the left and right spiral screws are rotatably mounted on the fixed-side bearing seat and the support-side bearing seat respectively through the fixed-side bearing and the support-side bearing seat.

7. The automatic centering fixture of the brake foot valve function testing device according to claim 1, characterized in that: The groove formed between the left and right clamping blocks matches the bottom structure of the brake foot valve.

8. The automatic centering fixture of the brake foot valve function testing device according to claim 1, characterized in that: The clamping drive motor is connected to the control unit of the brake foot valve function testing device. The control unit controls the rotation of the clamping drive motor to realize the automatic clamping and releasing of the brake foot valve.

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