Torsion beam toe angle automatic detection tool

Abstract

An automatic detection fixture for the toe-in and camber angle of a torsion beam, relating to the field of automotive parts inspection, includes a control module and detection mechanisms symmetrically mounted on both sides of the workpiece. The detection mechanisms include: a measurement module comprising a dial indicator, a dial indicator mounting plate, and a slider; the dial indicator is fixed to the slider via the mounting plate, and the slider slides in contact with a slide rail fixed to a worktable; a calibration module for zero-point calibration of the dial indicator, mounted on the worktable near the measurement module at the workpiece's measurement position; a measurement drive module for moving the measurement module toward the workpiece; and a control module for controlling the dial indicator to collect data sequentially. This invention uses a dial indicator as a data acquisition tool, combined with a microcontroller to control its sequential data acquisition, enabling rapid and accurate data acquisition, meeting the needs of rapid batch testing. It also features convenient and reliable calibration, stable measurement, and is easy to promote and use.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts testing technology, and in particular to an automatic testing fixture for the torsion beam toe-in camber angle. Background Technology

[0002] The toe angle of a car's four-wheel alignment is the angle between the wheel and the direction of travel, and the camber angle is the angle between the wheel and the direction perpendicular to the vehicle body. For passenger cars with non-independent suspension, the rear wheel angle of the four-wheel alignment needs to be milled on the wheel hub mounting surface using special machining equipment, and the mounting surface needs to be 100% inspected after machining. At present, the main measurement methods have many problems: (1) Three-coordinate measurement and angle conversion: The three-coordinate measurement is used to obtain the value and then the corresponding angle is calculated; this method is inefficient, the position of the value has a great influence on the data results, and it is not suitable for batch inspection. (2) High-precision scanning instrument scanning fitting comparison: The part processing plane is scanned and fitted using a high-precision scanning instrument, and then compared with the digital model; this method has high equipment cost, low efficiency, and high environmental requirements, and is not suitable for batch inspection in the workshop. (3) Laser ranging to convert angle: The corresponding angle value is calculated by laser ranging. This method has high requirements for the measurement environment and strict requirements for fixing the laser probe. If the probe is too close to the detection surface, it is easy to hit the laser probe when loading and unloading parts, which will cause instrument damage or measurement error. If the laser probe is too far from the detection surface, the measurement distance error will be relatively large, which is also not suitable for batch testing. (4) Inspection after assembly into the vehicle: After the torsion beam is processed, it is assembled into the vehicle and then inspected by the vehicle tilt measuring instrument. This method is suitable for the main engine plant, but it belongs to the post-process inspection. The processing process cannot be inspected, which can easily lead to the appearance of unqualified products in the early batch. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an automatic detection fixture for the torsion beam toe-in camber angle, so as to solve the problem that the existing technology cannot perform batch rapid detection of parts during the processing.

[0004] The technical solution to the above-mentioned technical problem is: an automatic detection fixture for the toe-in camber angle of a torsion beam, comprising a control module and detection mechanisms symmetrically installed on both sides of the workpiece, wherein the detection mechanisms include:

[0005] The measurement module includes a dial indicator as a data acquisition tool, a dial indicator mounting plate, and a slider. The dial indicator is mounted on the dial indicator mounting plate, the dial indicator mounting plate is fixed on the slider, and the slider slides in cooperation with a slide rail fixed on the worktable.

[0006] The calibration module is used to perform zero-point calibration on the dial indicator. This calibration module is installed on the worktable near the measuring module at the position of the workpiece to be measured.

[0007] A measurement drive module is used to move the measurement module toward the workpiece, and the measurement drive module is fixedly connected to the slider.

[0008] The control module is used to control the dial indicator to collect data sequentially, and the signal output terminal of the control module is connected to the dial indicator.

[0009] A further technical solution of this utility model is that each testing institution has four dial indicators, which are installed on the dial indicator mounting plate in a square arrangement.

[0010] A further technical solution of this utility model is that the calibration module includes a base, a mounting plate, a connecting plate, and a zeroing plate; the zeroing plate is used to calibrate the dial indicator to zero position. The zeroing plate is flush with the standard measurement surface of the workpiece. One end of the zeroing plate is fixedly connected to the connecting plate through the mounting plate. The bottom end of the connecting plate is hinged to the base. The base is fixed on the worktable on the side of the workpiece to be measured near the measurement module.

[0011] A further technical solution of this utility model is that the measurement drive module includes a cylinder, and the extended end of the cylinder is fixedly connected to the slider.

[0012] A further technical solution of this utility model is that the detection mechanism also includes a buffer, which is installed on the worktable at the end of the slide rail to protect and buffer the measurement module.

[0013] A further technical solution of this utility model is that the buffer is a spring buffer or a hydraulic buffer; and the top of the dial indicator mounting plate is also equipped with an anti-collision plate for protecting the dial indicator.

[0014] A further technical solution of this utility model is that the tooling also includes a main reference for positioning and clamping the workpiece. The main reference includes a main positioning pin and a rotary clamping cylinder respectively installed on the worktable. The main positioning pin is used to cooperate with the positioning hole of the workpiece, and the rotary clamping cylinder is used to clamp the workpiece. The signal input terminal of the rotary clamping cylinder is connected to the signal output terminal of the control module.

[0015] A further technical solution of this utility model is that the tooling also includes a secondary reference for preventing excessive shrinkage of the workpiece during welding from preventing it from being installed on the inspection fixture. The secondary reference includes a secondary reference base, a secondary reference slide rail, a secondary positioning pin slide, a slide limit plate, a secondary positioning pin mounting block, and a secondary positioning pin. The secondary reference base is fixed on the worktable, the secondary reference slide rail is installed on the secondary reference base, the secondary positioning pin slide slide slide slides in sliding cooperation with the secondary reference slide rail, and a limiting protrusion is provided on one end of the secondary positioning pin slide slide. The slide limit plate is installed on the secondary reference base on one side of the secondary positioning pin slide slide, and a limiting groove is provided on the slide limit plate. The limiting protrusion and the limiting groove are in clearance cooperation. The secondary positioning pin is a round pin, and the secondary positioning pin is installed on the secondary positioning pin slide through the secondary positioning pin mounting block.

[0016] A further technical solution of this utility model is that the gap between the limiting protrusion and the limiting groove is 5-10mm.

[0017] Due to the above structure, the automatic detection fixture for torsion beam toe-in camber angle of this utility model has the following advantages compared with the prior art:

[0018] 1. Efficient and accurate data acquisition:

[0019] This invention uses a dial indicator as a data acquisition tool, combined with a control module to control it to acquire data in a prescribed order, which can achieve fast and accurate data acquisition and meet the needs of batch rapid testing.

[0020] 2. Calibration is convenient and reliable:

[0021] The zeroing plate of this invention can perform zero-point calibration of a dial indicator without disassembling the instrument, and the detection accuracy can reach 0.01', ensuring the accuracy of the data. Even if there are differences when the dial indicator is fixed or the measuring head is worn, it will not affect the measurement results.

[0022] 3. Measurement stability:

[0023] The measuring module of this invention is driven by a cylinder to move all dial indicators simultaneously, and is protected and buffered by a buffer, making the measurement process more stable, reducing errors caused by the movement of the mechanism, and improving the reliability of the test.

[0024] 4. Suitable for performing full inspection of workpieces.

[0025] This invention facilitates data acquisition without affecting the loading and unloading of parts, and has high detection efficiency, completing data acquisition in just over ten seconds. It is suitable for full inspection of workpieces during processing.

[0026] 5. Simple structure and low cost

[0027] This utility model has a simple design and high measurement accuracy. It can measure the toe angle and camber angle without investing in related complex equipment, thus reducing equipment costs.

[0028] The technical features of the automatic detection fixture for the torsion beam toe-in camber angle of this utility model will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0029] Figure 1 Example 1: A schematic diagram of the automatic detection fixture for the torsion beam toe-in camber angle of this utility model.

[0030] Figure 2 : A schematic diagram of the structure of the automatic detection fixture for the torsion beam toe-in camber angle of this utility model, with the workpiece installed.

[0031] Figure 3 : Front view of the detection mechanism described in Example 1

[0032] Figure 4 : Figure 3 Top view,

[0033] Figure 5 : Figure 3 Left view,

[0034] Figure 6 : A three-dimensional structural diagram of the detection mechanism described in Example 1

[0035] Figure 7 : A three-dimensional structural schematic diagram of the secondary reference described in Embodiment 1.

[0036] Figure 8 A diagram showing four dial gauges arranged in a square.

[0037] Figure 9 This is a schematic diagram illustrating the calculation of the toe angle from dial indicator data during the operation of this utility model.

[0038] Figure 10 : A schematic diagram illustrating the calculation of the inclination angle using dial indicator data during the operation of this utility model;

[0039] In the above figures, the reference numerals are explained as follows:

[0040] 1-Workpiece,

[0041] 2-Testing mechanism, 21-Measurement module, 211-Dial indicator, 212-Dial indicator mounting plate.

[0042] 213-Slider, 214-Fixing block, 215-Slide plate

[0043] 22-Calibration module, 221-Base, 222-Mounting plate, 223-Connecting plate, 224-Zeroing plate.

[0044] 23-Measurement drive module, 231-Cylinder,

[0045] 24 - Buffer, 25 - Bumper plate

[0046] 3-Slide rail,

[0047] 4-Main reference, 41-Main locating pin, 42-Rotary clamping cylinder

[0048] 5-Secondary reference, 51-Secondary reference base, 52-Secondary reference slide rail, 53-Secondary locating pin slide, 531-Limiting protrusion.

[0049] 54-Slide table limit plate, 541-Limit groove, 55-Secondary locating pin mounting block, 56-Secondary locating pin.

[0050] 6-Low-voltage power supply box, 7-Button box. Detailed Implementation Example 1

[0051] An automatic fixture for detecting the toe-in camber angle of a torsion beam includes a control module, detection mechanisms 2 symmetrically mounted on both sides of a workpiece 1, a main reference 4, and a secondary reference 5, wherein:

[0052] Each testing facility 2 includes:

[0053] The measurement module 21 includes four dial indicators 211 as data acquisition tools, a dial indicator mounting plate 212, and a slider 213. The four dial indicators 211 are all digital display dial indicators, which can accurately acquire data. The four dial indicators 211 are arranged in a square pattern in the top, bottom, left, and right directions and are mounted on the dial indicator mounting plate 212 by fixing blocks 214. The bottom of the dial indicator mounting plate 212 is mounted on a sliding plate 215. The bottom of the sliding plate 215 is fixedly connected to the slider 213. The slider 213 slides in cooperation with the slide rail 3 fixed on the worktable.

[0054] The calibration module 22 is used to zero-calibrate the dial indicator 211 to prevent errors when the digital dial indicator is fixed. The calibration module 22 is installed on the worktable near the measuring module 21 at the workpiece's measurement position. The calibration module 22 includes a base 221, a mounting plate 222, a connecting plate 223, and a zeroing plate 224. The zeroing plate 224 has a U-shaped structure and is used for zero-calibrating the dial indicator 211. The zeroing plate 224 is flush with the standard measuring surface of the workpiece and fits against the surface to be measured. One end of the zeroing plate 224 is fixedly connected to the connecting plate 223 via the mounting plate 222. The bottom end of the connecting plate 223 is hinged to the base 221, which is fixed to the worktable. Before measurement, the zeroing plate is lowered, the measuring module 21 is moved into position, and the dial indicator 211 is zeroed. By setting up this calibration module 22, the dial indicator can be zeroed without disassembling it, effectively avoiding the impact of fixed differences in the dial indicator or wear of the measuring head on the accuracy of the data.

[0055] Measurement drive module 23, which includes cylinder 231, the extended end of cylinder 231 is fixedly connected to slider 213, and is used to drive all dial indicators 211 of measurement module 21 to move simultaneously toward workpiece 1;

[0056] The buffer 24 is installed on the worktable at the end of the slide rail 3 to protect and buffer the measuring module 21, ensuring the stability and reliability of the measurement process. The buffer 24 is a spring buffer or a hydraulic buffer.

[0057] A crash barrier 25 is installed on top of the dial indicator mounting plate 212 to protect the dial indicator 211 from impact.

[0058] The control module includes a microcontroller, which controls the four dial gauges 211 to collect data in the order of top, bottom, left and right to realize an automated data acquisition process. The microcontroller is installed in the low-voltage power supply box 6, and the signal output terminal of the microcontroller is connected to the signal input terminal of the dial gauge 211 through a cable.

[0059] The main reference 4 for positioning and clamping workpiece 1 includes a main positioning pin 41 and a rotary clamping cylinder 42 respectively mounted on the worktable. The main positioning pin 41 is a round pin used to cooperate with the positioning hole of the workpiece. The rotary clamping cylinder 42 is used to clamp the workpiece. The signal input terminal of the rotary clamping cylinder 42 is connected to the signal output terminal of the microcontroller.

[0060] The secondary reference 5 is used to prevent excessive shrinkage of the workpiece during welding, which would prevent it from being placed on the inspection fixture. The secondary reference 5 is installed on the opposite side of the main reference 4 and includes a secondary reference base 51, a secondary reference slide rail 52, a secondary positioning pin slide 53, a slide limit plate 54, a secondary positioning pin mounting block 55, and a secondary positioning pin 56. The secondary reference base 51 is fixed to the worktable, the secondary reference slide rail 52 is installed on the secondary reference base 51, and the secondary positioning pin slide 53 slides in cooperation with the secondary reference slide rail 52. A limiting protrusion 531 is provided on one side end of 3; the slide limiting plate 54 is installed on the secondary reference base 51 on one side of the secondary positioning pin slide 53, and the slide limiting plate 54 is provided with a limiting groove 541. The limiting protrusion 531 and the limiting groove 541 are in clearance fit, wherein the clearance between the limiting protrusion 531 and the limiting groove 541 is 5-10mm. The secondary positioning pin 56 is a round pin, and the secondary positioning pin 56 is installed on the secondary positioning pin slide 53 through the secondary positioning pin mounting block 55.

[0061] The reason why the gap between the limiting protrusion 531 and the limiting groove 541 is designed to be 5-10mm is that since both the main positioning pin and the secondary positioning pin are round pins (i.e. full pins), the workpiece will deform during welding. If both the main positioning pin and the secondary positioning pin are fixed, the workpiece will not be able to be installed in the fixture due to welding deformation. At this time, the secondary positioning pin needs to be made movable so that the workpiece can be installed in the fixture even if it is deformed and shrinks during welding. At the same time, the gap value can be measured with a gap gauge to determine the direction in which the workpiece deforms and shrinks.

[0062] The assembly process of this testing fixture is as follows:

[0063] Secure the four dial indicators to the dial indicator mounting plate according to the design requirements, ensuring a firm and accurate installation. Connect the microcontroller to the dial indicators via cables, and configure the microcontroller's control program to control the digital display dial indicators to collect data in the prescribed sequence. Install the zeroing board to facilitate zero-point calibration of the dial indicators. Install the cylinder and buffer, and connect the drive components to ensure the cylinder can move the dial indicators smoothly and the buffer can effectively provide protection and cushioning.

[0064] The working process of this utility model is as follows:

[0065] S1. Install and secure the workpiece;

[0066] The torsion beam workpiece to be tested is placed at the workpiece measurement position, positioned by the main positioning pin 41 of the main reference 4 and the secondary reference 5, and clamped by the rotary clamping cylinder 42.

[0067] S2. The cylinder drives the measuring module to move towards the surface of the workpiece to be measured. During the movement, the buffer decelerates and buffers the sliding of the measuring module to protect it from the impact of collisions and other factors on the measurement results.

[0068] S3. After the measurement module is in place, the dial indicator is zeroed and calibrated using the zeroing board of the calibration module;

[0069] S4. Start the microcontroller in the low-voltage power supply box 6 and press the data acquisition button on the button box 7. The microcontroller controls the dial indicator to collect data of the workpiece to be measured surface - the torsion beam hub mounting surface - in the order of up, down, left and right.

[0070] S5. After the source data acquisition is completed, the measurement module exits, the rotating clamping cylinder 42 releases the workpiece, and the workpiece is removed;

[0071] S6. Obtain and analyze the data transmitted by the dial indicator to obtain the values ​​of the toe angle and camber angle of the torsion beam. Specifically, calculate the corresponding toe angle θ by using the difference △A between the values ​​of the two dial indicators and the distance L1 between them, θ=arcsin(△A / L1); calculate the corresponding camber angle γ of the workpiece by using the difference △B between the values ​​of the two dial indicators and the distance L2 between them, γ=arcsin(△B / L2); and determine whether the toe angle and camber angle of the torsion beam are qualified based on the calculation results.

Claims

1. An automatic detection fixture for the toe-in camber angle of a torsion beam, characterized in that, The system includes a control module and detection mechanisms (2) symmetrically mounted on both sides of the workpiece (1). The detection mechanisms (2) include: The measurement module (21) includes a dial indicator (211), a dial indicator mounting plate (212), and a slider (213) as a data acquisition tool. The dial indicator (211) is mounted on the dial indicator mounting plate (212), the dial indicator mounting plate (212) is fixed on the slider (213), and the slider (213) slides in cooperation with the slide rail (3) fixed on the worktable. The calibration module (22) is used to perform zero-point calibration on the dial indicator (211). The calibration module (22) is installed on the worktable near the measuring module at the position to be measured on the workpiece. The measurement drive module (23) is used to drive the measurement module (21) to move toward the workpiece (1). The measurement drive module (23) is fixedly connected to the slider (213). The control module is used to control the dial indicator (211) to collect data in sequence. The signal output terminal of the control module is connected to the dial indicator (211).

2. The automatic detection fixture for the torsion beam toe-in camber angle according to claim 1, characterized in that, Each testing facility (2) has four dial gauges (211), which are installed on the dial gauge mounting plate (212) in a square arrangement.

3. The automatic detection fixture for the torsion beam toe-in camber angle according to claim 1, characterized in that, The calibration module (22) includes a base (221), a mounting plate (222), a connecting plate (223), and a zeroing plate (224). The zeroing plate (224) is used to calibrate the dial indicator (211) to zero. The zeroing plate (224) is flush with the standard measurement surface of the workpiece. One end of the zeroing plate (224) is fixedly connected to the connecting plate (223) through the mounting plate (222). The bottom end of the connecting plate (223) is hinged to the base (221). The base (221) is fixed on the worktable on the side of the workpiece to be measured near the measuring module (21).

4. The automatic detection fixture for the torsion beam toe-in camber angle according to claim 1, characterized in that, The measurement drive module (23) includes a cylinder (231), the extended end of which is fixedly connected to the slider (213).

5. The automatic detection fixture for the torsion beam toe-in camber angle according to claim 1, characterized in that, The detection mechanism (2) also includes a buffer (24), which is installed on the worktable at the end of the slide rail (3) to protect and buffer the measurement module (21).

6. The automatic detection fixture for the torsion beam toe-in camber angle according to claim 5, characterized in that, The buffer (24) is a spring buffer or a hydraulic buffer; the top of the dial indicator mounting plate (212) is also equipped with a shock plate (25) to protect the dial indicator (211).

7. The automatic detection fixture for the torsion beam toe-in camber angle according to claim 1, characterized in that, The tooling also includes a main reference (4) for positioning and clamping the workpiece (1). The main reference (4) includes a main positioning pin (41) and a rotary clamping cylinder (42) respectively installed on the worktable. The main positioning pin (41) is used to cooperate with the positioning hole of the workpiece. The rotary clamping cylinder (42) is used to clamp the workpiece (1). The signal input terminal of the rotary clamping cylinder (42) is connected to the signal output terminal of the control module.

8. The automatic detection fixture for the torsion beam toe-in camber angle according to claim 1, characterized in that, The fixture also includes a secondary reference (5) to prevent excessive shrinkage of the workpiece during welding from preventing it from being installed on the inspection fixture. The secondary reference (5) includes a secondary reference base (51), a secondary reference slide rail (52), a secondary locating pin slide (53), a slide limit plate (54), a secondary locating pin mounting block (55), and a secondary locating pin (56). The secondary reference base (51) is fixed on the workbench, and the secondary reference slide rail (52) is mounted on the secondary reference base (51). The secondary locating pin slide (53) slides in conjunction with the secondary reference slide rail (52). The slide (53) is equipped with a limiting protrusion (531) on one side end; the slide limiting plate (54) is installed on the secondary reference base (51) on one side of the slide (53), and the slide limiting plate (54) is provided with a limiting groove (541), and the limiting protrusion (531) is in clearance fit with the limiting groove (541); the secondary positioning pin (56) is a round pin, and the secondary positioning pin (56) is installed on the slide (53) through the secondary positioning pin mounting block (55).

9. The automatic detection fixture for the torsion beam toe-in camber angle according to claim 8, characterized in that, The gap between the limiting protrusion (531) and the limiting groove (541) is 5-10mm.

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