A worm gear center distance detection device

Abstract

This utility model provides a worm gear center distance detection device, including a base with a slide rail and a slider; a sliding seat assembly fixedly connected to the slider, the sliding seat assembly including a base plate, on which a support frame is fixedly connected; a worm gear assembly limiting mechanism fixedly disposed on the sliding seat assembly, the worm gear assembly limiting mechanism being used to limit the worm gear assembly; a worm clamping mechanism disposed on the base and located on the left side of the sliding seat assembly, the worm clamping mechanism being used to abut one end of the worm; a worm limiting rotation mechanism disposed on the base and located on the right side of the sliding seat assembly, the worm limiting rotation mechanism being used to fix the other end of the worm and drive the worm to rotate; and a displacement detection mechanism disposed on the front side of the sliding seat assembly and used to detect the displacement of the sliding seat assembly. This utility model solves the problems of insufficient detection accuracy and inconvenient operation of existing detection devices.

Description

Technical Field

[0001] This invention relates to the field of electric steering system testing technology, and more particularly to a worm gear center distance testing device. Background Technology

[0002] Electric power steering columns, gear-type electric power steering systems, and dual pinion electric power steering systems all utilize worm gear pairs. Due to differences in machining methods, equipment precision, and material properties, as well as the subsequent gear pressing processes after worm gear machining, tolerances accumulate. To ensure these tolerances remain within specified limits, careful selection of the worm gear is essential. Measuring the center distance between the two parts during worm gear pairing and analyzing the meshing condition are crucial. Poor meshing can easily lead to abnormal noises and other malfunctions. Traditional testing devices suffer from inadequate structural design, resulting in insufficient testing accuracy; some devices also require manual rotation of the worm gear for testing, making the operation inconvenient. Summary of the Invention

[0003] The purpose of this invention is to provide a novel worm gear center distance detection device to solve the problems of insufficient detection accuracy and inconvenient operation of existing detection devices.

[0004] The technical solution adopted by this invention to solve its technical problem is: A worm gear center distance detection device includes a base, on which a slide rail and a slider are provided; A sliding seat assembly is fixedly connected to the slider. The sliding seat assembly includes a base plate, and a support frame is fixedly connected to the base plate. A worm gear assembly limiting mechanism is fixedly mounted on the sliding seat assembly, and the worm gear assembly limiting mechanism is used to limit the worm gear assembly; A worm gear clamping mechanism is provided on the base and located on the left side of the sliding seat assembly. The worm gear clamping mechanism is used to clamp one end of the worm. A worm gear limiting rotation mechanism is mounted on the base and located on the right side of the sliding seat assembly. The worm gear limiting rotation mechanism is used to fix the other end of the worm gear and drive the worm gear to rotate. The displacement detection mechanism is located on the front side of the sliding seat assembly and is used to detect the displacement of the sliding seat assembly.

[0005] Preferably, in conjunction with the above scheme, the worm gear assembly limiting mechanism includes a limiting sleeve, a fixing protrusion ring is provided on the side wall of the limiting sleeve, the limiting sleeve is inserted into the mounting hole of the base plate and fixedly connected to the base plate through the fixing protrusion ring, and a first bearing is fixedly provided in the shaft hole of the limiting sleeve, the inner ring of the first bearing is used to limit the gear shaft of the worm gear assembly.

[0006] Preferably, in conjunction with the above scheme, the support frame is connected to an upper clamping mechanism, which is used to clamp the upper end of the worm gear assembly, and the worm gear assembly limiting mechanism is fixedly connected to the base plate.

[0007] Preferably, in conjunction with the above scheme, the upper clamping mechanism shown includes an elbow clamp fixedly connected to the support frame, and a pin sleeve is fixedly connected to the lower end of the pressure rod of the elbow clamp. A first rotary pin is inserted into the shaft hole of the pin sleeve, and the head of the first rotary pin is used to abut against the upper end of the worm gear assembly.

[0008] Preferably, in conjunction with the above scheme, the worm gear clamping mechanism includes a left fixed seat fixedly connected to the base, a limiting seat fixedly connected to the upper end of the left fixed seat, a sliding locking mechanism connected to the limiting seat, and a second rotating pin connected to the sliding locking mechanism, the second rotating pin being used to abut one end of the worm gear.

[0009] Preferably, in conjunction with the above scheme, the sliding locking mechanism includes a sliding hole in the limiting seat, a sliding shaft slidably connected in the sliding hole, and the second rotary pin inserted into the shaft hole at the right end of the sliding shaft; a spring, a fixing plate, a pressure plate, and a nut are sequentially sleeved on the left side of the sliding shaft; the fixing plate is fixedly connected to the left end of the limiting seat; both the fixing plate and the pressure plate are slidably connected to the sliding shaft; the upper part of the fixing plate is hinged to the upper end of the pressure plate; a handle is fixedly connected to the upper end of the pressure plate; and the nut is fixedly connected to the left end of the sliding shaft by screws.

[0010] Preferably, in conjunction with the above scheme, a sliding sleeve is fixedly connected to the sliding hole, and the sliding shaft is slidably connected to the sliding sleeve. A locking hole communicating with the sliding hole is provided on the side wall of the limiting seat, and a locking screw is provided in the locking hole. The sliding sleeve is fixedly connected to the limiting seat through the locking screw.

[0011] Preferably, in conjunction with the above scheme, the worm gear limiting rotation mechanism includes a right fixed seat fixedly connected to the base, a motor fixedly connected to the right fixed seat, a limiting shaft hole provided on the right fixed seat, the limiting shaft hole being configured to correspond to the rotating shaft of the motor, and a second bearing and a limiting ring being provided in the limiting shaft hole; a coupling is fixedly connected to the rotating shaft of the motor, and the coupling is adapted to one end of the worm gear.

[0012] Preferably, in conjunction with the above scheme, a rear clamping mechanism is provided on the rear side of the sliding seat assembly. The rear clamping mechanism includes a pressure sensor fixedly connected to the rear end of the sliding seat assembly, a motor mounting base fixedly connected to the base and located behind the sliding seat assembly, and a linear reciprocating motor fixedly connected to the motor mounting base. The telescopic rod of the linear reciprocating motor is used to clamp the pressure sensor.

[0013] Preferably, in conjunction with the above scheme, the displacement detection mechanism includes a connecting block fixedly connected to the front end of the sliding seat assembly, a detection fixing seat fixedly connected to the base and located in front of the sliding seat assembly, and a displacement sensor fixedly connected to the detection fixing seat. The connecting block is fixedly connected to the pull rod of the displacement sensor.

[0014] The beneficial effects of this invention are as follows: This invention provides a worm gear center distance detection device. The worm gear is held at both ends by a worm gear limiting rotation mechanism and a worm gear clamping mechanism. A motor drives the worm gear and worm wheel assembly to rotate, and a displacement detection mechanism is used to detect the center distance between the worm gear and worm wheel. This device provides high accuracy in measuring the center distance between the worm gear and worm wheel, and the assembly and disassembly of the worm gear and worm are more convenient, thus improving the efficiency of the detection work.

[0015] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the worm gear assembly in this invention.

[0017] Figure 2 This is a structural diagram of a worm gear center distance detection device according to the present invention.

[0018] Figure 3 This is a structural diagram of the worm gear center distance detection device of the present invention from another direction.

[0019] Figure 4 This is a structural diagram of the worm gear center distance detection device of the present invention after the base is hidden.

[0020] Figure 5 This is a front view of a worm gear center distance detection device according to the present invention.

[0021] Figure 6 This is a top view of a worm gear center distance detection device according to the present invention.

[0022] Figure 7 for Figure 6 AA sectional view.

[0023] Figure 8 for Figure 6 BB cross-sectional view.

[0024] Figure 9 This is a structural diagram showing the connection between the sliding seat assembly and the upper clamping mechanism in this invention.

[0025] Figure 10 This is a diagram of the worm gear assembly limiting mechanism in this invention.

[0026] Figure 11 This is a diagram of the worm gear clamping mechanism in this invention.

[0027] Figure 12 This is an exploded view of the worm gear clamping mechanism in this invention.

[0028] Figure 13 This is a diagram of the worm gear limiting rotation mechanism in this invention.

[0029] Figure 14 This is an exploded view of the worm gear limiting rotation mechanism in this invention.

[0030] The components include: 1. Base; 2. Slide rail; 3. Slider; 4. Sliding seat assembly; 411. Mounting hole; 5. Worm gear assembly limiting mechanism; 6. Worm clamping mechanism; 7. Worm clamping rotation mechanism; 8. Upper clamping mechanism; 9. Displacement detection mechanism; 10. Rear clamping mechanism; 41. Base plate; 42. Support frame; 51. Limiting sleeve; 52. Fixing protrusion ring; 53. First bearing; 61. Left fixed seat; 62. Limiting seat; 621. Sliding hole; 622. Locking hole; 63. Sliding sleeve; 64. Sliding shaft; 65. Second rotary ejector pin. 66. Spring; 67. Fixing plate; 68. Pressure plate; 681. Handle; 69. Nut; 71. Right fixing seat; 711. Limiting shaft hole; 72. Motor; 73. Second bearing; 74. Limiting ring; 75. Coupling; 81. Elbow clamp; 82. Ejector sleeve; 83. First rotary ejector pin; 91. Connecting block; 92. Detection fixing seat; 93. Displacement sensor; 101. Pressure sensor; 102. Motor fixing seat; 103. Linear reciprocating motor; 100. Worm gear assembly; 1001. Gear shaft; 200. Worm. Detailed Implementation

[0031] like Figures 1 to 8 The existing worm gear center distance detection device shown includes: Base 1, with slide rail 2 and slider 3 mounted on it; The sliding seat assembly 4 is fixedly connected to the slider 3. The sliding seat assembly 4 includes a base plate 41, on which a support frame 42 with an inverted U-shaped structure is fixedly connected. The worm gear assembly limiting mechanism 5 is fixedly mounted on the sliding seat assembly 4. The worm gear assembly limiting mechanism 5 is used to limit the worm gear assembly 100, and the worm gear assembly 100 can rotate in the worm gear assembly limiting mechanism 5. The worm gear clamping mechanism 6 is mounted on the base 1 and located on the left side of the sliding seat assembly 4. The worm gear clamping mechanism 6 is used to clamp one end of the worm gear 200. The worm gear limiting rotation mechanism 7 is set on the base 1 and located on the right side of the sliding seat assembly 4. The worm gear limiting rotation mechanism 7 is used to fix the other end of the worm gear 200 and drive the worm gear 200 to rotate. The displacement detection mechanism 9 is located on the front side of the sliding seat assembly 4 and is used to detect the displacement of the sliding seat assembly 4.

[0032] To facilitate the support and positioning of the worm gear assembly 100, and to facilitate the insertion of the gear shaft 1001 of the worm gear assembly 100 into the worm gear assembly positioning mechanism 5, as follows: Figure 10 As shown, the worm gear assembly limiting mechanism 5 includes a limiting sleeve 51. A fixing protrusion 52 is provided on the side wall of the limiting sleeve 51. The limiting sleeve 51 is inserted into the mounting hole 411 of the base plate 41 and is fixedly connected to the base plate 41 by screwing through the fixing protrusion 52. A first bearing 53 is fixedly installed in the shaft hole of the limiting sleeve 51. The inner ring of the first bearing 53 is used to limit the gear shaft 1001 of the worm gear assembly 100. The outer ring of the first bearing 53 is interference-fitted with the shaft hole of the limiting sleeve 51, and the inner ring of the first bearing 53 is clearance-fitted with the gear shaft 1001 of the worm gear assembly 100.

[0033] To prevent the worm gear assembly 100 from shaking during rotation, such as Figure 9 As shown, an upper clamping mechanism 8 is connected to the support frame 42. The upper clamping mechanism 8 is used to clamp the upper end of the worm gear assembly 100. The worm gear assembly limiting mechanism 5 is fixedly connected to the base plate 41.

[0034] To facilitate clamping the worm gear assembly 100, such as Figure 9 As shown, the upper clamping mechanism 8 includes an elbow clamp 81 fixedly connected to the support frame 42. A pin sleeve 82 is fixedly connected to the lower end of the pressure rod of the elbow clamp 81. A first rotating pin 83 is inserted into the shaft hole of the pin sleeve 82, and the head of the first rotating pin 83 abuts against the upper end of the worm gear assembly 100. When the handle of the elbow clamp 81 is pulled up, the pressure rod of the elbow clamp 81 drives the pin sleeve 82 and the first rotating pin 83 to press down on the worm gear assembly 100. When it is necessary to disassemble the worm gear assembly 100, simply press down the handle of the elbow clamp 81. The pressure rod of the elbow clamp 81 drives the pin sleeve 82 and the first rotating pin 83 to move upward together, thereby unlocking the worm gear assembly 100. The first rotating pin 83 is a standard part, and its head can rotate with the worm gear assembly 100. A Michelin NKA-MT2 model can be used. The elbow clamp 81 is a standard part and model number Clamptek GH-36204-M can be used.

[0035] To facilitate manual tightening of the left end of the worm gear 200, such as Figure 11As shown, the worm gear clamping mechanism 6 includes a left fixed seat 61 fixedly connected to the base 1. The upper end face of the left fixed seat 61 is provided with an inclined surface parallel to the axis of the worm gear 200. A limit seat 62 is fixedly connected to the upper end of the left fixed seat 61. A sliding locking mechanism is connected to the limit seat 62, and a second rotating pin 65 is connected to the sliding locking mechanism. The second rotating pin 65 is used to abut the left end of the worm gear 200. The second rotating pin 65 is a standard part, and its head can rotate together with the worm gear 200. The model can be Michelin NKA-MT2.

[0036] To facilitate the locking and unlocking of the worm gear clamping mechanism 6 via elastic sliding, such as Figure 7 and Figure 12 As shown, the sliding locking mechanism includes a sliding hole 621 in the limiting seat 62, a sliding shaft 64 slidably connected in the sliding hole 621, and a second rotary pin 65 inserted into the shaft hole at the right end of the sliding shaft 64. A spring 66, a fixing plate 67, a pressure plate 68, and a nut 69 are sequentially mounted on the left side of the sliding shaft 64. The fixing plate 67 is fixedly connected to the left end of the limiting seat 62. Both the fixing plate 67 and the pressure plate 68 are slidably connected to the sliding shaft 64. The upper part of the fixing plate 67 is hinged to the upper end of the pressure plate 68. A handle 681 is fixedly connected to the upper end of the pressure plate 68. The nut 69 is fixedly connected to the left end of the sliding shaft 64 by a screw. When the handle 681 is pressed down, the pressure plate 68 rotates clockwise around the shaft, causing the nut 69, the sliding shaft 64, and the second rotary pin 65 to move to the left, thereby unlocking the left end of the worm gear 200. When the handle 681 is released, the pressure plate 68 rotates counterclockwise around the axis due to the rebound force of the spring 66, which drives the nut 69, the sliding shaft 64 and the second rotating pin 65 to move to the right together, thereby pressing against the left end of the worm 200.

[0037] To avoid wear on the limit seat 62, such as Figure 7 and Figure 12 As shown, a sliding sleeve 63 is fixedly connected in the sliding hole 621, and the sliding shaft 64 is slidably connected to the sliding sleeve 63. Lubricating oil can be applied to the sliding sleeve 63. A locking hole 622 communicating with the sliding hole 621 is provided on the side wall of the limiting seat 62. A locking screw is provided in the locking hole 622. The sliding sleeve 63 is fixedly connected to the limiting seat 62 through the locking screw.

[0038] To facilitate the automatic rotation of the worm gear 200 via motor 72 while simultaneously limiting its right end, such as... Figure 13 and Figure 14As shown, the worm gear limiting rotation mechanism 7 includes a right fixed seat 71 fixedly connected to the base 1. A motor 72 is fixedly connected to the right fixed seat 71. A limiting shaft hole 711 is provided on the right fixed seat 71, corresponding to the rotating shaft of the motor 72. A second bearing 73 and a limiting ring 74 are provided in the limiting shaft hole 711. A coupling 75 is fixedly connected to the rotating shaft of the motor 72. The coupling 75 is used to adapt and fix the right end of the worm gear 200. The second bearing 73 can be a standard self-aligning bearing, and its inner ring can be deflected at a certain angle to eliminate a small amount of machining error. A toothed structure can be provided on the inner wall of the shaft hole of the coupling 75 for better connection with the right end of the worm gear 200.

[0039] In order to provide a certain clamping force to the sliding seat assembly 4 so that the worm gear assembly 100 can better mesh with the worm 200, such as Figure 3 As shown, a rear clamping mechanism 10 is provided on the rear side of the sliding seat assembly 4. The rear clamping mechanism 10 includes a pressure sensor 101 fixedly connected to the rear end of the sliding seat assembly 4, a motor mounting base 102 fixedly connected to the base 1 and located behind the sliding seat assembly 4, and a linear reciprocating motor 103 fixedly connected to the motor mounting base 102. The telescopic rod of the linear reciprocating motor 103 is used to clamp the pressure sensor 101. The pressure of the telescopic rod of the linear reciprocating motor 103 when it clamps the pressure sensor 101 can be finely adjusted to maintain a certain amount of force close to the standard worm 200 on the worm gear assembly 100, so that the worm gear can be stably meshed.

[0040] To better detect changes in the center distance of the worm gear during meshing, such as Figure 2 As shown, the displacement detection mechanism 9 includes a connecting block 91 fixedly connected to the front end of the sliding seat assembly 4, a detection fixing seat 92 fixedly connected to the base 1 and located in front of the sliding seat assembly 4, and a displacement sensor 93 fixedly connected to the detection fixing seat 92. The connecting block 91 is fixedly connected to the pull rod of the displacement sensor 93. If the center distance of the worm gear changes significantly, the worm gear assembly 100 will drive the sliding seat assembly 4 to move along the slide rail assembly, thereby driving the pull rod of the displacement sensor 93 to move. When the displacement exceeds the rated value, the worm gear center distance detection fails.

[0041] The steps for measuring center distance using this device are as follows: I. Standard center distance gauge calibration: First, calibrate each component of this device using the standard center distance gauge to solidify the center distance parameters; II. Fixing the standard worm: Fix the standard worm 200 onto the worm gear assembly limiting mechanism 6 and the worm clamping mechanism 7; 3. Fixing the worm gear to be selected or tested: Place the worm gear assembly 100 to be selected or tested on the worm gear assembly limiting mechanism 5.

[0042] IV. Testing or Selection: The sliding seat assembly 4 is pushed forward by the rear clamping mechanism 100, so that the worm gear assembly 100 maintains a certain force close to the standard worm 200, and the motor 72 is turned on to drive the standard worm 200 to rotate. The difference between the displacement sensor 93 and the standard gauge is read by the test system to confirm whether the center distance meets the requirements.

[0043] In the description of this invention, it should be understood that terms such as “center,” “longitudinal,” “lateral,” “vertical,” “horizontal,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “bottom,” “inner,” “outer,” “top,” “one end,” “one side,” “both ends,” “both sides,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this patent, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct applications in other situations, fall within the protection scope of the present invention.

Claims

1. A worm gear center distance detection device, comprising: The base (1) is provided with a slide rail (2) and a slider (3); The sliding seat assembly (4) is fixedly connected to the slider (3). The sliding seat assembly (4) includes a base plate (41) and a support frame (42) is fixedly connected to the base plate (41). The worm gear assembly limiting mechanism (5) is fixedly installed on the sliding seat assembly (4), and the worm gear assembly limiting mechanism (5) is used to limit the worm gear assembly (100). The worm gear clamping mechanism (6) is disposed on the base (1) and located on the left side of the sliding seat assembly (4). The worm gear clamping mechanism (6) is used to abut one end of the worm (200). The worm gear limiting rotation mechanism (7) is set on the base (1) and located on the right side of the sliding seat assembly (4). The worm gear limiting rotation mechanism (7) is used to fix the other end of the worm (200) and drive the worm (200) to rotate. The displacement detection mechanism (9) is set on the front side of the sliding seat assembly (4) and is used to detect the displacement of the sliding seat assembly (4).

2. The device according to claim 1, wherein The worm gear assembly limiting mechanism (5) includes a limiting sleeve (51), and a fixing protrusion ring (52) is provided on the side wall of the limiting sleeve (51). The limiting sleeve (51) is inserted into the mounting hole (411) of the base plate (41) and fixedly connected to the base plate (41) through the fixing protrusion ring (52). A first bearing (53) is fixedly provided in the shaft hole of the limiting sleeve (51). The inner ring of the first bearing (53) is used to limit the gear shaft (1001) of the worm gear assembly (100).

3. The device according to claim 1, wherein The support frame (42) is connected to an upper clamping mechanism (8), which is used to clamp the upper end of the worm gear assembly (100). The worm gear assembly limiting mechanism (5) is fixedly connected to the base plate (41).

4. The device according to claim 3, wherein The upper clamping mechanism (8) shown includes an elbow clamp (81) fixedly connected to the support frame (42). The lower end of the pressure rod of the elbow clamp (81) is fixedly connected to a pin sleeve (82). A first rotary pin (83) is inserted into the shaft hole of the pin sleeve (82). The head of the first rotary pin (83) is used to abut against the upper end of the worm gear assembly (100).

5. The device according to claim 1, wherein The worm gear clamping mechanism (6) includes a left fixed seat (61) fixedly connected to the base (1). The upper end of the left fixed seat (61) is fixedly connected to a limiting seat (62). A sliding locking mechanism is connected to the limiting seat (62). A second rotary pin (65) is connected to the sliding locking mechanism. The second rotary pin (65) is used to abut one end of the worm gear (200).

6. The worm-gear center distance detecting device according to claim 5, wherein The sliding locking mechanism includes a sliding hole (621) in the limiting seat (62), a sliding shaft (64) is slidably connected in the sliding hole (621), and the second rotary pin (65) is inserted into the shaft hole at the right end of the sliding shaft (64). A spring (66), a fixing plate (67), a pressure plate (68), and a nut (69) are sequentially sleeved on the left side of the sliding shaft (64). The fixing plate (67) is fixedly connected to the left end of the limiting seat (62). The fixing plate (67) and the pressure plate (68) are both slidably connected to the sliding shaft (64). The upper part of the fixing plate (67) is hinged to the upper end of the pressure plate (68). A handle (681) is fixedly connected to the upper end of the pressure plate (68). The nut (69) is fixedly connected to the left end of the sliding shaft (64) by screws.

7. The worm-gear center distance detecting device according to claim 6, wherein A sliding sleeve (63) is fixedly connected in the sliding hole (621), and the sliding shaft (64) is slidably connected to the sliding sleeve (63). A locking hole (622) communicating with the sliding hole (621) is provided on the side wall of the limiting seat (62), and a locking screw is provided in the locking hole (622). The sliding sleeve (63) is fixedly connected to the limiting seat (62) through the locking screw.

8. The device according to claim 1, wherein The worm gear limiting rotation mechanism (7) includes a right fixed seat (71) fixedly connected to the base (1), a motor (72) fixedly connected to the right fixed seat (71), a limiting shaft hole (711) provided on the right fixed seat (71), the limiting shaft hole (711) corresponding to the rotating shaft of the motor (72), a second bearing (73) and a limiting ring (74) provided in the limiting shaft hole (711); a coupling (75) fixedly connected to the rotating shaft of the motor (72), the coupling (75) being adapted to one end of the worm gear (200).

9. The device according to claim 1, wherein The rear side of the sliding seat assembly (4) is provided with a rear clamping mechanism (10). The rear clamping mechanism (10) includes a pressure sensor (101) fixedly connected to the rear end of the sliding seat assembly (4), a motor mounting base (102) fixedly connected to the base (1) and located behind the sliding seat assembly (4), and a linear reciprocating motor (103) fixedly connected to the motor mounting base (102). The telescopic rod of the linear reciprocating motor (103) is used to clamp the pressure sensor (101).

10. The device according to claim 1, wherein The displacement detection mechanism (9) includes a connecting block (91) fixedly connected to the front end of the sliding seat assembly (4), a detection fixed seat (92) fixedly connected to the base (1) and located in front of the sliding seat assembly (4), and a displacement sensor (93) fixedly connected to the detection fixed seat (92). The connecting block (91) is fixedly connected to the pull rod of the displacement sensor (93).

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