A turning device for producing automotive parts

Abstract

This invention relates to the field of metal turning, and more particularly to a turning apparatus for automotive parts production. Existing apparatuses are prone to stress deformation during turning due to excessively long rollers and a single fulcrum, making it difficult to adjust the roller position in real time and determine if the adjustment is adequate. Furthermore, it is difficult to predict whether the roller will deflect during rotation, easily leading to the scrapping of the roller during processing. The new turning apparatus for automotive parts production includes a drive motor, etc.; a three-jaw chuck is mounted on the output shaft of the drive motor for clamping automotive drive rollers; a slide rail is fixedly connected to a support base plate, and an electric slide table is slidably connected to the slide rail. Two sliding frames drive a wheel frame to clamp the side of the roller, and then the three-jaw chuck is tightened to fix one end of the roller. This provides the roller with an additional fulcrum during processing, reducing the likelihood of deformation due to excessive roller length during turning.

Description

Technical Field

[0001] This invention relates to the field of metal turning, and more particularly to a turning apparatus for the production of automotive parts. Background Technology

[0002] Many of the important automotive components are made of metal. Among them, the drive shaft, an important power component, is generally made of steel or aluminum alloy and is usually machined from metal rollers. In order to meet the needs of automotive assembly and to optimize strength, the metal rollers are turned at an angle.

[0003] However, existing equipment is prone to stress deformation during turning due to the excessive length of the roller and the single fulcrum. It is not convenient to adjust the position of the roller in real time and judge whether the adjustment is in place. Furthermore, it is not convenient to predict whether the roller will deflect during rotation, which can easily lead to the scrapping of the roller. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a turning device for automobile parts production that increases the number of support points to prevent stress deformation, makes it easier to adjust the position of the roller in real time to prevent tilting, and makes it easier to predict the rotation state of the roller in advance.

[0005] A turning device for producing automotive parts includes a drive motor, a three-jaw chuck mounted on the output shaft of the drive motor for clamping automotive drive shaft rollers, a support base plate fixedly connected to the lower part of the drive motor, a slide rail fixedly connected to the support base plate, an electric slide table slidably connected to the slide rail, four limiting columns fixedly connected to the electric slide table, an auxiliary mechanism mounted on the support base plate for assisting turning, and a tool shifting mechanism mounted on the limiting columns for automatically moving the tool head for turning.

[0006] Furthermore, the auxiliary mechanism includes a support frame fixedly connected to the support base plate. Two sliding frames are slidably connected to the support frame, and two wheel frames are slidably connected to each of the two sliding frames. Each wheel frame has a rubber wheel, and a connecting spring connects the two wheel frames. A connecting plate is fixedly connected to one side of each of the two sliding frames, and a threaded post is threaded between the two connecting plates. The threads on the two parts of the threaded post have opposite directions, and a worm gear is fixedly connected to the threaded post. A vertical rod is fixedly connected to the support base plate, and a servo motor is fixedly connected to the vertical rod. A worm gear is fixedly connected to the drive shaft of the servo motor, and the worm gear meshes with the worm gear. A push rod is fixedly connected to one of the connecting plates, and a pressure sensor is fixedly connected to the other connecting plate. The pressure sensor is connected to the servo motor via a wire.

[0007] Furthermore, the tool-moving mechanism includes two guide plates, both of which are fixedly connected to the support base plate. The guide plates have guide grooves, and a movable stage is slidably connected between the four limiting columns. The two sides of the movable stage are respectively located in the guide grooves of the two guide plates, and a tool head is fixedly connected to the movable stage.

[0008] Furthermore, it also includes an indicating mechanism mounted on the support frame. This indicating mechanism is used to indicate whether the automotive drive shaft roller is correctly positioned. The indicating mechanism includes a side plate fixedly connected to the upper part of the support frame. A sliding table is slidably connected to the side plate, and a stop block is fixedly connected to the side plate. A swing frame is rotatably connected to the lower part of the sliding table. Two contact wheels are rotatably connected to the lower part of the swing frame. A friction wheel one is fixedly connected to the swing frame's rotating shaft, and a second friction wheel is rotatably connected to the lower part of the sliding table. A torsion spring connects the second friction wheel to the sliding table. Friction wheel one is larger than friction wheel two. A swing rod is fixedly connected to friction wheel two. A plane reflector is fixedly connected to the lower part of the swing rod. A photoelectric reflection sensor is fixedly connected to the support base plate. A display screen is provided on the upper part of the photoelectric reflection sensor. The display screen and the photoelectric reflection sensor are connected by wires. A limit rod is fixedly connected to one side of each sliding frame. A threaded adjusting rod is rotatably connected to each limit rod. Two movable levers are threadedly connected to each threaded adjusting rod. The limit rod passes through the movable levers. The two threads on the threaded adjusting rod are opposite.

[0009] Furthermore, it also includes a toggle mechanism, which is disposed on the support base plate. The toggle mechanism is used to drive the shaft roller to rotate when calibrating the position of the shaft roller. The toggle mechanism includes two support plates, both of which are fixedly connected to the support base plate. A baffle frame is slidably connected to the upper part of one of the support plates. A return spring is connected between the baffle frame and the support plate. A rack and pinion is fixedly connected to one end of the baffle frame. Two rotating rods are rotatably connected between the two support plates. A transmission gear is fixedly connected to each of the two rotating rods. The two transmission gears mesh. A drive gear is fixedly connected to one end of one of the rotating rods. The drive gear meshes with the rack and pinion. A clamping frame is fixedly connected to each of the two rotating rods. Two limit wheels are rotatably connected to each clamping frame. A rotating gear is fixedly connected to the side of one of the limit wheels. A guide rail is fixedly connected to the support base plate. An electric slider is slidably connected to the guide rail. The electric slider is connected to the pressure sensor through a wire. A moving rack is fixedly connected to the electric slider.

[0010] The beneficial effects are as follows: 1. The two sliding frames will drive the wheel frame to clamp the side of the shaft roller, and then tighten the three-jaw chuck so that the three-jaw chuck fixes one end of the shaft roller and completes the clamping. This gives the shaft roller an extra fulcrum during processing, and it is not easy for the shaft roller to deform during the turning process due to its excessive length.

[0011] 2. When the roller is tilted, the two contact wheels and the swing frame will also tilt due to their contact with the roller surface. The tilting of the swing frame will cause friction wheel one to rotate at a certain angle, which in turn will cause friction wheel two to rotate at a certain angle. The torsion spring will be twisted, and the rotation of friction wheel two will cause the swing rod to swing at a certain angle. The swing rod will cause the plane reflector to no longer be in a vertical state, which will cause the photoelectric reflection sensor to be in an untriggered state. The untriggered photoelectric reflection sensor will cause the display screen to turn off. By observing the status of the display screen, the operator can continuously adjust the position of the roller when fixing it with the three-jaw chuck, so that the display screen is always on after the roller is fixed, ensuring that the roller is not tilted when placed and fixed. This makes the roller more stable when rotating. Since friction wheel two is smaller than friction wheel one, and under the leverage amplification effect of the swing rod, the tilt angle of the roller can be amplified, making even a small tilt of the roller easy to read.

[0012] 3. When the pressure sensor is triggered, it will also control the electric slider to move upward and then move downward once to reset. The movement of the electric slider will drive the moving rack to move. The moving rack will mesh with the rotating gear that swings with the clamping frame, and drive the rotating gear to rotate. The rotation of the rotating gear will drive one of the limit wheels to rotate, and the rotation of the limit wheel will in turn drive the shaft roller to rotate. By rotating the shaft roller before fixing it, the operator can judge in advance whether the shaft roller will deviate after subsequent fixing and rotation by observing the status of the shaft roller on the display screen when it rotates. This makes it less likely that the shaft roller will be scrapped due to improper fixing during turning. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 This is a three-dimensional structural diagram of the auxiliary mechanism and the tool-shifting mechanism of the present invention.

[0015] Figure 3 This is a three-dimensional structural diagram of the auxiliary mechanism of the present invention.

[0016] Figure 4 This is a three-dimensional structural diagram of the indicating mechanism of the present invention.

[0017] Figure 5 For the present invention Figure 4 A magnified three-dimensional structural diagram at point A in the middle.

[0018] Figure 6 This is a schematic diagram of the separate three-dimensional structure of the indicating mechanism of the present invention.

[0019] Figure 7 This is a schematic diagram of the separate three-dimensional structure of the sliding frame, wheel frame and movable lever of the present invention.

[0020] Figure 8 This is a three-dimensional structural diagram of the actuating mechanism of the present invention.

[0021] Figure 9 This is a partial three-dimensional structural diagram of the actuating mechanism of the present invention.

[0022] In the attached diagram: 1: Drive motor, 2: Three-jaw chuck, 3: Support base plate, 41: Slide rail, 42: Electric slide table, 43: Limiting column, 51: Support frame, 52: Sliding frame, 521: Connecting spring, 53: Wheel frame, 54: Connecting plate, 55: Threaded column, 56: Worm gear, 57: Upright rod, 58: Servo motor, 59: Worm gear, 510: Top rod, 511: Pressure sensor, 62: Guide plate, 63: Moving table, 64: Cutter head, 71: Side plate, 72: Sliding table, 73: Stop, 74: Swing frame, 75: Contact wheel, 7 6: Friction wheel one; 77: Friction wheel two; 78: Torsion spring; 79: Swing rod; 710: Plane reflector; 711: Photoelectric reflection sensor; 712: Display screen; 713: Limiting rod; 714: Threaded adjusting rod; 715: Moving lever; 81: Support plate; 82: Baffle frame; 83: Return spring; 84: Rack and pinion; 85: Rotating rod; 86: Transmission gear; 861: Drive gear; 87: Clamping frame; 88: Limiting wheel; 89: Rotating gear; 810: Guide rail; 811: Electric slider; 812: Moving rack. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings.

[0024] Example 1

[0025] A turning device for producing automotive parts, such as Figure 1-9 As shown, the device includes a drive motor 1, a three-jaw chuck 2 mounted on the output shaft of the drive motor 1 for clamping the automotive drive shaft roller, a support base plate 3 fixedly connected to the lower part of the drive motor 1, a slide rail 41 fixedly connected to the support base plate 3, an electric slide table 42 slidably connected to the slide rail 41, four limiting columns 43 fixedly connected to the electric slide table 42, an auxiliary mechanism mounted on the support base plate 3 for assisting turning, and a tool moving mechanism mounted on the limiting columns 43 for automatically moving the tool head 64 for turning.

[0026] The auxiliary mechanism includes a support frame 51, which is fixedly connected to the support base plate 3. Two sliding frames 52 are slidably connected to the support frame 51. Two wheel frames 53 are slidably connected to each of the two sliding frames 52. Each wheel frame 53 has a rubber wheel. A connecting spring 521 connects the two wheel frames 53. A connecting plate 54 is fixedly connected to one side of each of the two sliding frames 52. A threaded post 55 is threadedly connected between the two connecting plates 54. The threaded post 55 has two parts... The threads are in opposite directions. A worm gear 56 is fixedly connected to the threaded post 55. A vertical rod 57 is fixedly connected to the support base plate 3. A servo motor 58 is fixedly connected to the vertical rod 57. A worm 59 is fixedly connected to the drive shaft of the servo motor 58. The worm 59 meshes with the worm gear 56. A push rod 510 is fixedly connected to one of the connecting plates 54. A pressure sensor 511 is fixedly connected to the other connecting plate 54. The pressure sensor 511 is connected to the servo motor 58 through a wire.

[0027] The tool shifting mechanism includes two guide plates 62, both of which are fixedly connected to the support base plate 3. The guide plates 62 have guide grooves. A moving platform 63 is slidably connected between the four limiting columns 43. The two sides of the moving platform 63 are respectively located in the guide grooves of the two guide plates 62. A tool head 64 is fixedly connected to the moving platform 63.

[0028] In actual operation, the drive shaft of an automobile is machined from a single shaft roller. For subsequent assembly, the cross-section of the drive shaft needs to be beveled. First, the operator places one end of the shaft roller horizontally into the three-jaw chuck 2. Then, the operator starts the servo motor 58. The servo motor 58 drives the worm gear 59 to rotate. The rotation of the worm gear 59 drives the threaded column 55 to rotate via the worm wheel 56. The rotation of the threaded column 55 drives two connecting plates 54 to move closer together via two opposing threads. The movement of the two connecting plates 54 drives two sliding brackets 52 to move closer together as well. Then, the two sliding brackets 52 drive the wheel brackets 53 to clamp the side of the shaft roller. During clamping, the two wheel brackets 53 move horizontally a certain distance in opposite directions, stretching the connecting spring 521, and then tightening... Tighten the three-jaw chuck 2 to fix one end of the shaft roller, completing the clamping. This gives the shaft roller an extra fulcrum during processing, making it less prone to deformation during turning due to its excessive length. The two connecting plates 54 will also drive the push rod 510 and pressure sensor 511 to move closer to each other. Then, when the two sliding frames 52 clamp the shaft roller, the pressure sensor 511 will be squeezed by the push rod 510 and triggered. The triggering of the pressure sensor 511 will control the servo motor 58 to stop rotating. Then, the operator first starts the drive motor 1, which will drive the three-jaw chuck 2 and the shaft roller to rotate at high speed. Then, the electric slide table 42 is started. The electric slide table 42 drives the cutter head 64 to move horizontally to turn the end face of the shaft roller. Under the guidance of the guide plate 62, the cutter head 64 will turn a bevel on the end face of the shaft roller.

[0029] Example 2

[0030] Based on Example 1, such as Figure 4-7As shown, it also includes an indicating mechanism 7, which is mounted on the support frame 51. The indicating mechanism is used to indicate whether the automotive drive shaft roller is positioned correctly. The indicating mechanism includes a side plate 71, which is fixedly connected to the upper part of the support frame 51. A sliding table 72 is slidably connected to the side plate 71, and a stop block 73 is fixedly connected to the side plate 71. A swing frame 74 is rotatably connected to the lower part of the sliding table 72. Two contact wheels 75 are rotatably connected to the lower part of the swing frame 74. A friction wheel 76 is fixedly connected to the rotating shaft of the swing frame 74. A second friction wheel 77 is rotatably connected to the lower part of the sliding table 72. A torsion spring 78 connects the second friction wheel 77 to the sliding table 72, and the second friction wheel 77 contacts the first friction wheel 76. The friction wheel 76 is larger than the friction wheel 77. A swing rod 79 is fixedly connected to the friction wheel 77. A plane reflector 710 is fixedly connected to the lower part of the swing rod 79. A photoelectric reflection sensor 711 is fixedly connected to the support base plate 3. A display screen 712 is provided on the upper part of the photoelectric reflection sensor 711. The display screen 712 is connected to the photoelectric reflection sensor 711 through a wire. A limit rod 713 is fixedly connected to one side of each sliding frame 52. A threaded adjusting rod 714 is rotatably connected to each limit rod 713. Two movable levers 715 are threadedly connected to each threaded adjusting rod 714. The limit rod 713 passes through the movable levers 715. The two threads on the threaded adjusting rod 714 are opposite.

[0031] Initially, the plane mirror 710 is in a vertical position, the photoelectric reflection sensor 711 is in a triggered state, and the reading on the display screen 712 is zero. When the operator places the shaft roller horizontally in the three-jaw chuck 2, the side of the shaft roller is first placed between the two contact wheels 75, and then the contact wheels 75 are pressed upward, causing the swing frame 74 and the sliding table 72 to move upward a certain distance. After the sliding table 72 moves upward a certain distance, its upper end is blocked by the stop block 73. Finally, the operator fixes one end of the shaft roller on the three-jaw chuck 2. When fixing the shaft roller, the operator can judge whether the position of the shaft roller is fixed in place by observing the reading on the display screen 712. When the shaft roller is tilted, since the two contact wheels 75 are in contact with the surface of the shaft roller, the two contact wheels 75 and the swing frame 74 will also tilt. The tilt of the swing frame 74 will cause the friction wheel 1 76 to rotate at a certain angle, which in turn will cause the friction wheel 2 77 to rotate at a certain angle. The torsion spring 78 is twisted, and then the friction wheel 2 77 Rotation causes the swing arm 79 to swing at a certain angle. The swing of the swing arm 79 causes the plane reflector 710 to no longer be in a vertical state, which in turn causes the photoelectric reflection sensor 711 to measure the tilt angle of the plane reflector 710 and then display the reading on the display screen 712. In this way, the operator can observe the reading on the display screen 712 to determine the posture of the shaft roller. Initially, the moving lever 715 is far away from the wheel frame 53 before adjustment. Then, by rotating and adjusting the upper and lower threaded adjusting rods 714 respectively, the moving lever 715 is driven to squeeze and adjust the distance between the two wheel frames 53 in each group. This can further adjust the posture of the shaft roller, and finally make the reading on the display screen 712 return to zero after the shaft roller is fixed, so that the position of the shaft roller is not tilted when it is placed and fixed, which makes the shaft roller more stable when rotating. Since the friction wheel 2 77 is smaller than the friction wheel 1 76, and under the leverage amplification effect of the swing arm 79, the tilt angle of the shaft roller can be amplified, making even a small tilt of the shaft roller easy to read.

[0032] Example 3

[0033] Based on Example 2, such as Figure 8-9As shown, it also includes a toggle mechanism, which is mounted on the support base plate 3. The toggle mechanism is used to rotate the shaft roller when calibrating its position. The toggle mechanism includes two support plates 81, both of which are fixedly connected to the support base plate 3. A baffle frame 82 is slidably connected to the upper part of one of the support plates 81. A return spring 83 connects the baffle frame 82 to the support plate 81. A rack and pinion rod 84 is fixedly connected to one end of the baffle frame 82. Two rotating rods 85 are rotatably connected between the two support plates 81. A transmission gear 86 is fixedly connected to each of the two rotating rods 85. The transmission gears 86 mesh, and one end of one of the rotating rods 85 is fixedly connected to a drive gear 861. The drive gear 861 meshes with the rack and pinion 84. Both rotating rods 85 are fixedly connected to a clamping frame 87. Each clamping frame 87 is rotatably connected to two limiting wheels 88. One of the limiting wheels 88 is fixedly connected to a rotating gear 89 on its side. A guide rail 810 is fixedly connected to the support base plate 3. An electric slider 811 is slidably connected to the guide rail 810. The electric slider 811 is connected to the pressure sensor 511 through a wire. A movable rack 812 is fixedly connected to the electric slider 811.

[0034] When the operator places the roller, the side of the roller presses against the baffle frame 82, causing it to move horizontally. This horizontal movement of the baffle frame 82 drives the drive gear 861 to rotate, which in turn drives the two transmission gears 86 to rotate in opposite directions. This causes the two rotating rods 85 to rotate in opposite directions by a certain angle. The rotation of the two rotating rods 85 causes the clamping frame 87 and the limiting wheels 88 to swing together. The swinging of the two clamping frames 87 towards each other causes the four limiting wheels 88 to clamp the side of the roller. Then, the operator starts the servo motor 58 to drive the two sliding frames 52 and the wheel frame 53 to clamp the side of the roller. When the pressure sensor 511 is triggered, it also... The electric slider 811 is controlled to move upward and then return to its original position once. The movement of the electric slider 811 will drive the moving rack 812 to move. The moving rack 812 will mesh with the rotating gear 89 that swings along with the clamping frame 87, and drive the rotating gear 89 to rotate. The rotation of the rotating gear 89 will drive one of the limit wheels 88 to rotate. The rotation of the limit wheel 88 will then drive the shaft roller to rotate. By rotating the shaft roller before fixing it, the operator can judge in advance whether the shaft roller will deviate after subsequent fixing and rotation by observing the state of the display screen 712 when the shaft roller is rotating. This makes it less likely that the shaft roller will be scrapped due to improper fixing during turning.

[0035] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation so as to cover all variations and equivalent structures and functions.

Claims

1. A turning apparatus for producing automotive parts, characterized in that: The device includes a drive motor (1), a three-jaw chuck (2) on the output shaft of the drive motor (1), the three-jaw chuck (2) being used to clamp the automobile drive shaft roller, a support base plate (3) fixedly connected to the lower part of the drive motor (1), a slide rail (41) fixedly connected to the support base plate (3), an electric slide table (42) slidably connected to the slide rail (41), four limiting columns (43) fixedly connected to the electric slide table (42), an auxiliary mechanism on the support base plate (3) for assisting turning, and a tool moving mechanism on the limiting columns (43) for automatically moving the tool head (64) for turning. The auxiliary mechanism includes a support frame (51), which is fixedly connected to the support base plate (3). Two sliding frames (52) are slidably connected to the support frame (51), and two wheel frames (53) are slidably connected to each of the two sliding frames (52). Each wheel frame (53) is equipped with a rubber wheel, and a connecting spring (521) is connected between the two wheel frames (53). A connecting plate (54) is fixedly connected to one side of each of the two sliding frames (52), and a threaded post (55) is threadedly connected between the two connecting plates (54). A worm gear (56) is fixedly connected to the column (55), a vertical rod (57) is fixedly connected to the support base plate (3), a servo motor (58) is fixedly connected to the vertical rod (57), a worm (59) is fixedly connected to the drive shaft of the servo motor (58), the worm (59) meshes with the worm gear (56), a top rod (510) is fixedly connected to one of the connecting plates (54), a pressure sensor (511) is fixedly connected to the other connecting plate (54), and the pressure sensor (511) is connected to the servo motor (58) through a wire; It also includes an indicator mechanism, which is mounted on the support frame (51). The indicator mechanism is used to indicate whether the automobile drive shaft roller is placed accurately. The indicator mechanism includes a side plate (71), which is fixedly connected to the upper part of the support frame (51). A sliding table (72) is slidably connected to the side plate (71). A stop block (73) is fixedly connected to the side plate (71). A swing frame (74) is rotatably connected to the lower part of the sliding table (72). Two contact wheels (75) are rotatably connected to the lower part of the swing frame (74). A friction wheel one (76) is fixedly connected to the rotating shaft of the swing frame (74). A friction wheel two (77) is rotatably connected to the lower part of the sliding table (72). A torsion spring (78) is connected between the friction wheel two (77) and the sliding table (72). The friction wheel two (77) contacts the friction wheel one (76). Friction wheel one (76) is larger than friction wheel two (77). A swing rod (79) is fixedly connected to friction wheel two (77). A plane reflector (710) is fixedly connected to the lower part of the swing rod (79). A photoelectric reflection sensor (711) is fixedly connected to the support base plate (3). A display screen (712) is provided on the upper part of the photoelectric reflection sensor (711). The display screen (712) and the photoelectric reflection sensor (711) are connected by wires. A limit rod (713) is fixedly connected to one side of each sliding frame (52). A threaded adjusting rod (714) is rotatably connected to each limit rod (713). Two movable levers (715) are connected to each threaded adjusting rod (714) by thread. The limit rod (713) passes through the movable levers (715). The two threads on the threaded adjusting rod (714) are opposite.

2. A turning apparatus for producing automotive parts according to claim 1, characterized in that: The threads on the two parts of the threaded column (55) are in opposite directions.

3. A turning apparatus for producing automotive parts according to claim 1, characterized in that: The blade-moving mechanism includes two guide plates (62), both of which are fixedly connected to the support base plate (3). A movable stage (63) is slidably connected between the four limiting columns (43), and a blade head (64) is fixedly connected to the movable stage (63).

4. A turning apparatus for producing automotive parts according to claim 3, characterized in that: The guide plate (62) has a guide groove, and the two sides of the moving stage (63) are respectively located in the guide grooves of the two guide plates (62).

5. A turning apparatus for producing automotive parts according to claim 1, characterized in that: It also includes a toggle mechanism, which is mounted on the support base plate (3). The toggle mechanism is used to drive the shaft roller to rotate when calibrating the position of the shaft roller. The toggle mechanism includes two support plates (81), both of which are fixedly connected to the support base plate (3). A baffle frame (82) is slidably connected to the upper part of one of the support plates (81). A return spring (83) is connected between the baffle frame (82) and the support plate (81). A rack and pinion rod (84) is fixedly connected to one end of the baffle frame (82). Two rotating rods (85) are rotatably connected between the two support plates (81). A transmission gear (86) is fixedly connected to each of the two rotating rods (85). The wheels (86) mesh, and one end of one of the rotating rods (85) is fixedly connected to a drive gear (861). The drive gear (861) meshes with the rack and pinion (84). Both rotating rods (85) are fixedly connected to a clamping frame (87). Each clamping frame (87) is rotatably connected to two limiting wheels (88). One of the limiting wheels (88) is fixedly connected to a rotating gear (89) on its side. The support base plate (3) is fixedly connected to a guide rail (810). An electric slider (811) is slidably connected to the guide rail (810). The electric slider (811) is connected to the pressure sensor (511) through a wire. A moving rack (812) is fixedly connected to the electric slider (811).

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