Shock absorber reverse force detection device

Abstract

The utility model provides a shock absorber reverse force detection device, which belongs to the technical field of automobile shock absorbers, and comprises a rack and a positioning tool, the positioning tool is vertically arranged along the rack, and the positioning tool comprises a positioning part and a fixing part arranged above the positioning part; the pressing detection mechanism is arranged at the top of the rack and comprises a driving source and a detection pressure head which is arranged at the output end of the driving source and can vertically move along the rack to measure the workpiece reverse force; a pre-pressing position and a detection position are arranged in the vertical direction of the rack from bottom to top. According to the utility model, the pre-pressing position and the detection position are arranged on the rack, the detection pressure head moves to the pre-pressing position to apply pre-pressure to the piston rod of the shock absorber, then the detection pressure head moves to the detection position, and the piston rod rebounds to be in contact with the detection pressure head at the detection position so as to measure the reverse force of the piston rod of the shock absorber in a free rebounding state; therefore, the purpose of accurately measuring the reverse force of the shock absorber is achieved.

Description

A shock absorber reaction force detection device Technical Field

[0001] This utility model relates to the field of automotive shock absorber technology, specifically to a shock absorber reaction force detection device. Background Technology

[0002] A car's shock absorption system consists of springs and shock absorbers. The shock absorber suppresses the oscillations caused by the spring's absorption of shocks and absorbs the energy of road impacts. After manufacturing, the shock absorber undergoes elasticity testing to ensure its performance and quality. The shock absorber's reaction force is a crucial indicator of its quality. Current technology typically uses a drive source to press a pressure head against the shock absorber's piston rod, moving the piston rod a certain distance. A force sensor measures the force exerted by the piston rod on the pressure head, thus determining the piston rod's reaction force. However, in this reaction force testing process, the pressure head remains in rigid contact with the piston rod's tip, continuously applying force. Therefore, it cannot detect the magnitude of the reaction force when the piston rod is in a free-rebound state, resulting in low accuracy of existing shock absorber reaction force testing methods and an inability to accurately measure the magnitude of the shock absorber's reaction force. Summary of the Invention

[0003] This invention provides a shock absorber reaction force detection device, which can measure the magnitude of the reaction force of the shock absorber piston rod in the free rebound state, thereby achieving the purpose of accurately measuring the shock absorber reaction force.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A shock absorber reaction force detection device includes a frame and further includes:

[0006] A positioning fixture, wherein the positioning fixture is vertically arranged along the machine frame, the positioning fixture includes a positioning part and a fixing part disposed above the positioning part; and

[0007] A clamping detection mechanism is provided on the top of the frame. The clamping detection mechanism includes a drive source and a detection head provided at the output end of the drive source and capable of moving vertically along the frame to measure the workpiece's resistance force.

[0008] The frame is provided with a pre-compression position and a detection position from bottom to top vertically.

[0009] Preferably, the positioning part includes a positioning seat and a positioning cylinder vertically fixed to the top of the positioning seat.

[0010] Preferably, the fixing part includes a fixing seat and a fixing block disposed on the fixing seat for horizontally clamping the workpiece.

[0011] Preferably, the positioning fixture further includes a lifting mechanism, which includes several guide columns vertically arranged on the frame, a drive assembly fixed on the guide columns, and a lifting screw arranged at the output end of the drive assembly and capable of moving vertically along the frame. The top end of the lifting screw is fixedly connected to the positioning seat.

[0012] Preferably, the drive assembly includes a base plate fixed on the guide post, a drive motor fixed on the base plate, and a worm gear assembly disposed at the output end of the drive motor, wherein the lifting screw is spirally telescopically disposed at the output end of the worm gear assembly.

[0013] Preferably, the top of the positioning seat is fixed with a mounting plate parallel to the positioning seat by a limiting rod, and an adjusting screw distributed parallel to the limiting rod is rotatably connected to the mounting plate. One side of the fixed seat is threadedly connected to the adjusting screw, and the other side is slidably connected to the limiting rod.

[0014] Preferably, the side wall of the positioning seat is further provided with a guide sleeve that is slidably connected to the guide post.

[0015] Preferably, the driving source is a servo electric cylinder, and a pressure sensor is provided between the detection head and the output end of the servo electric cylinder.

[0016] As can be seen from the above technical solutions, this utility model has the following beneficial effects:

[0017] 1. In this utility model, the workpiece is manually placed on the positioning part to hold it in place. After the product is positioned, the drive source descends to the pre-compression position, and the top of the piston rod of the shock absorber presses against the detection head. The detection head presses down a preset distance at a set slow speed, and then returns to the detection position at a set fast speed. After the piston rod rebounds and presses against the detection head at the detection position, the reaction force data is collected. After the data collection is completed, the drive source returns to the initial position. This allows for the measurement of the reaction force of the shock absorber in its free rebound state. This utility model sets a pre-compression position and a detection position on the frame. The detection head moves to the pre-compression position to apply pre-pressure to the piston rod of the shock absorber. Then, the detection head moves to the detection position, and the piston rod rebounds to contact the detection head at the detection position, thereby measuring the magnitude of the reaction force of the shock absorber piston rod in its free rebound state, thus achieving the purpose of accurately measuring the reaction force of the shock absorber.

[0018] 2. In this utility model, by setting up a lifting mechanism, when the drive motor is working, it drives the worm gear assembly at its output end to work. The worm gear assembly then drives the lifting screw to move vertically along the frame, thereby driving the positioning seat and the fixed seat on it to move vertically as a whole, so as to adjust the positioning fixture to a suitable position for fixing the shock absorber. In addition, under the action of the adjusting screw, the fixed seat can also be driven to move along the axial direction of the adjusting screw to adjust the vertical position of the fixed block, thereby adapting to different models of products. Attached Figure Description

[0019] Figure 1 is a front view of this utility model;

[0020] Figure 2 is a side view of this utility model;

[0021] Figure 3 is a schematic diagram of the connection between the drive assembly and the lifting screw.

[0022] In the diagram: 10, frame; 110, pre-compression position; 120, detection position; 211, positioning seat; 212, positioning cylinder; 213, limit rod; 214, mounting plate; 215, adjusting screw; 216, guide sleeve; 221, fixed seat; 222, fixed block; 231, guide post; 232, lifting screw; 233, base plate; 234, drive motor; 235, protective cylinder; 310, servo electric cylinder; 320, detection pressure head; 40, pressure sensor. Detailed Implementation

[0023] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] To achieve the above objectives, the embodiments of this utility model adopt the following technical solution: Referring to Figure 1, a shock absorber reaction force detection device includes a frame 10, a positioning fixture, and a clamping detection mechanism. The positioning fixture is vertically arranged along the frame 10, and includes a positioning part and a fixing part disposed above the positioning part. The clamping detection mechanism is disposed at the top of the frame 10. Further, the clamping detection mechanism includes a drive source and a detection head 320. The detection head 320 is disposed at the output end of the drive source, and the detection head can move vertically along the frame 10 to measure the reaction force of the workpiece. In this device, a pre-compression position 110 and a detection position 120 are vertically arranged from bottom to top along the frame 10. During use, the bottom of the workpiece is manually placed on the positioning part to secure it. Once the product is in place, the drive source descends to the pre-compression position 110, and the top of the shock absorber's piston rod presses against the detection head. The detection head presses down a preset distance at a set slow speed, then returns to the detection position at a set fast speed. After the piston rod rebounds and presses against the detection head at the detection position, the counterforce data is collected. After data collection is complete, the drive source returns to its initial position. This allows for the measurement of the counterforce in the free rebound state of the shock absorber. This invention, by setting a pre-compression position and a detection position on the frame, uses the detection head to apply pre-compression pressure to the shock absorber's piston rod. The detection head then moves to the detection position, and the piston rod rebounds to contact the detection head at the detection position, thus measuring the magnitude of the counterforce in the free rebound state of the shock absorber's piston rod, thereby achieving the purpose of accurately measuring the shock absorber's counterforce.

[0025] Referring to Figure 1, as a preferred technical solution of this embodiment, the positioning part includes a positioning seat 211 and a positioning cylinder 212 vertically fixed on the top of the positioning seat. The positioning seat is a plate structure and the positioning cylinder is a sleeve structure. In use, the positioning seat is set on the frame and the positioning cylinder is fixedly connected to the top of the positioning seat. The positioning cylinder serves to limit the bottom of the shock absorber. That is, when fixing the shock absorber, the bottom end of the shock absorber can be placed inside the positioning cylinder to limit and fix the shock absorber through the positioning cylinder.

[0026] Furthermore, the fixing part includes a fixing seat 221 and a fixing block 222 disposed on the fixing seat. The fixing block 222 is used to horizontally clamp the workpiece. That is, after the bottom end of the shock absorber is limited by the positioning cylinder, the piston rod of the shock absorber can also be fixed from above by the fixing block. In this way, the shock absorber is fixed at both the top and bottom to improve the stability of the positioning fixture in fixing the workpiece.

[0027] Furthermore, in order to clamp the shock absorber piston rod by fixing block 222, a double-headed cylinder can be installed on the fixing base 221. There are two fixing blocks, and the two fixing blocks are set facing each other at the output end of the double-headed cylinder.

[0028] Specifically, the fixing block 222 is connected to the two piston rods of the double-headed cylinder arranged opposite to each other. This allows the double-headed cylinder to drive the two fixing blocks to move towards or away from each other, thus clamping the piston rods of the shock absorber. Furthermore, to improve the clamping stability of the piston rods, the two fixing blocks have "V"-shaped notches on opposite sides. During use, these notches are used to stably clamp the piston rods. Moreover, the "V"-shaped notches conform to the shape of the product, and magnets are installed on the inner wall of the "V" to attract the product, enabling rapid product positioning.

[0029] Referring to Figures 1, 2, and 3, in some embodiments, the positioning fixture further includes a lifting mechanism. The lifting mechanism includes guide posts 231, a drive assembly, and a lifting screw 232. Several guide posts 231 are arranged vertically along the frame 10. The drive assembly is fixedly mounted on the guide posts. The lifting screw 232 is located at the output end of the drive assembly and can move vertically along the frame 10. The top end of the lifting screw is fixedly connected to the positioning seat 211. Further, the drive assembly includes a base plate 233, a drive motor 234, and a worm gear assembly. The base plate 233 is fixedly mounted on the guide posts 231, the drive motor 234 is fixedly mounted on the base plate, and the worm gear assembly is located at the output end of the drive motor. The lifting screw 232 is spirally telescopically located at the output end of the worm gear assembly. It should be noted that the worm gear assembly includes a housing, a worm, and a worm wheel. The worm is fixedly connected to the output shaft of the drive motor, and the worm wheel meshes with the worm. Both the worm and worm wheel are rotatably mounted inside the housing via bearings. Simultaneously, an internal thread matching the lifting screw 232 is machined into the inner cavity of the worm wheel. In use, the drive motor drives the worm to rotate, which in turn drives the worm wheel to rotate at a reduced speed. Since the lifting screw is threadedly connected to the worm wheel, and the top of the lifting screw is fixedly connected to the positioning seat 211, the rotation of the worm wheel drives the lifting screw to move up and down, thereby causing the positioning seat and the fixed seat to move axially along the frame, achieving the purpose of lifting and lowering the workpiece on the positioning fixture.

[0030] Furthermore, a mounting plate 214 parallel to the positioning seat is fixed to the top of the positioning seat 211 via a limiting rod 213. An adjusting screw 215, parallel to the limiting rod, is rotatably connected to the mounting plate. One side of the fixed seat 221 is threadedly connected to the adjusting screw, and the other side is slidably connected to the limiting rod. That is, the fixed seat 221 passes through both the adjusting screw and the limiting rod. Thus, when the adjusting screw rotates, the limiting rod's limiting effect on the fixed seat causes it to move axially along the adjusting screw, thereby causing the fixed block to move synchronously, achieving the purpose of raising and lowering the fixed part, and facilitating more convenient limiting and fixing of the top of the shock absorber. In addition, it should be noted that the presence of the limiting rod 213 enables the fixed seat 221 to move stably vertically along the adjusting screw 215.

[0031] Meanwhile, in order to facilitate the stable vertical movement of the lifting screw 232 along the frame and to protect the lifting screw, a protective cylinder 235 is also fixed at the bottom of the base plate 233. When the lifting screw moves up and down along the worm gear axis, it can simultaneously move along the axial direction of the protective cylinder 235, that is, to achieve the purpose of telescopic displacement along the inner cavity of the protective cylinder.

[0032] Furthermore, to ensure the positioning seat 211 moves stably along the guide post 231, a guide sleeve 216 is provided on the side wall of the positioning seat 211, which is slidably connected to the guide post 231. Specifically, in this embodiment, the number of guide sleeves can be set to multiple corresponding to the number of guide posts. The guide sleeves are entirely fitted over the outside of the guide posts. Thus, when the drive motor moves the positioning seat, the movement of the guide sleeves along the guide posts can be used to achieve stable lifting and lowering of the positioning seat. It should be noted that the presence of the guide sleeve 216 limits the positioning seat 211 to always moving linearly along the guide post 231.

[0033] In some embodiments, the driving source is a servo electric cylinder 310, and a pressure sensor 40 is provided between the detection head and the output end of the servo electric cylinder. In this way, when the detection head is driven by the servo electric cylinder to contact the piston rod of the shock absorber, the reaction force of the shock absorber can be measured by the pressure sensor.

[0034] In use, the workpiece is manually placed on the positioning seat 211, and the bottom of the shock absorber is limited and fixed by the positioning cylinder 212. At the same time, the piston rod of the shock absorber is clamped by the fixing block 222 to fix the workpiece. After the product is placed, the servo cylinder 310 descends to the pre-pressing position 110, and the top of the piston rod presses against the detection head 320. Then the detection head 320 presses down a preset distance at a set slow speed, and then returns to the detection position 120 at a set fast speed. After the piston rod rebounds and presses against the detection head 320 at the detection position 120, the counterforce data is collected. After the data collection is completed, the servo cylinder 310 returns to the origin and compares the recorded upper and lower limits of the counterforce with the standard value. If it is within the specified range, the result is judged as "OK"; if it exceeds the range, the result is judged as "NG" and an alarm is triggered.

[0035] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A shock absorber reaction force detection device, comprising a frame (10), characterized in that, Also includes: The positioning fixture is arranged vertically along the frame (10), and the positioning fixture includes a positioning part and a fixing part arranged above the positioning part; And a pressing detection mechanism, which is set on the top of the frame (10). The pressing detection mechanism includes a drive source and a detection head (320) set at the output end of the drive source and capable of moving vertically along the frame (10) to measure the workpiece resistance force; wherein, a pre-pressing position (110) and a detection position (120) are respectively provided from bottom to top along the vertical direction of the frame (10).

2. The shock absorber reaction force detection device according to claim 1, characterized in that, The positioning part includes a positioning seat (211) and a positioning cylinder (212) vertically fixed to the top of the positioning seat.

3. The shock absorber reaction force detection device according to claim 2, characterized in that, The fixing part includes a fixing seat (221) and a fixing block (222) disposed on the fixing seat for horizontally clamping the workpiece.

4. The shock absorber reaction force detection device according to claim 3, characterized in that, The positioning fixture also includes a lifting mechanism, which includes several guide columns (231) vertically arranged on the frame (10), a drive assembly fixed on the guide columns, and a lifting screw (232) arranged at the output end of the drive assembly and capable of moving vertically along the frame (10). The top end of the lifting screw is fixedly connected to the positioning seat (211).

5. The shock absorber reaction force detection device according to claim 4, characterized in that, The drive assembly includes a base plate (233) fixed on the guide post (231), a drive motor (234) fixed on the base plate, and a worm gear assembly disposed at the output end of the drive motor. The lifting screw (232) is spirally extended and retracted at the output end of the worm gear assembly.

6. The shock absorber reaction force detection device according to claim 5, characterized in that, The top of the positioning seat (211) is fixed with a mounting plate (214) parallel to the positioning seat via a limiting rod (213). An adjusting screw (215) parallel to the limiting rod is rotatably connected to the mounting plate. One side of the fixed seat (221) is threadedly connected to the adjusting screw, and the other side is slidably connected to the limiting rod.

7. The shock absorber reaction force detection device according to claim 6, characterized in that, The side wall of the positioning seat (211) is also provided with a guide sleeve (216) that is slidably connected to the guide post (231).

8. The shock absorber reaction force detection device according to claim 1, characterized in that, The driving source is a servo electric cylinder (310), and a pressure sensor (40) is provided between the detection head and the output end of the servo electric cylinder.

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