Automobile valve body welding device

Abstract

The invention discloses an automobile valve body welding device which comprises a rack, a working platform rotating intermittently is arranged on the rack, a plurality of jigs used for containing valve bodies are arranged on the working platform, and a connecting piece used for containing to-be-welded connecting pieces is arranged on one side of each jig. A CCD assembly, a carrying assembly, a welding assembly, a horizontal detection assembly and a height detection assembly which are arranged above the jig and are sequentially arranged are further arranged in the rack, the CCD assembly is used for photographing and positioning the valve body and the connecting piece, and the carrying assembly is used for placing the connecting piece to be welded above the valve body. The welding assembly is used for welding a valve body and a connecting piece, the levelness detection assembly is used for detecting the levelness of the welded connecting piece, and the height detection assembly is used for detecting the height difference between the welded connecting piece and the valve body. Welding and measuring of the valve body are achieved, the production efficiency of the valve body is improved, and the labor burden of workers is relieved.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a welding device for an automobile valve body. Background Art

[0002] The valve body is a major component of the valve. It is a component that controls the direction, pressure, and flow of the fluid, and can make the liquid, gas, or powder medium in the pipe flow or stop. In the production and processing of the valve body, welding is an important link in the production, which is related to the matching accuracy and sealing of the valve body. By using a welding device to weld the valve body, its welding accuracy and welding sealing are ensured.

[0003] For example, the application number CN202410543484.8 discloses a valve body processing and welding device, which can stably clamp the valve body body around the clamping and fixing part, and at the same time, the welding part can be directly extended into the interior of the valve body, and the internal connection of the valve body can be fully and well welded with the cooperation of argon shielding gas, rare earth element compound powder and welding wire. This device can realize automatic welding of the valve body, but in some occasions with high precision requirements, the staff is required to measure its size after welding, which affects the processing efficiency. Therefore, it is necessary to develop a device integrating welding and measurement to improve the processing efficiency of the valve body. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an automobile valve body welding device, which can realize the welding and measurement of the valve body, improve the production efficiency of the valve body, and reduce the labor burden of the staff.

[0005] Specifically, the present invention discloses an automobile valve body welding device, comprising:

[0006] A frame, wherein an intermittently rotating working platform is provided on the frame, a plurality of jigs for accommodating the valve body are provided on the working platform, and one side of the jig is provided with a connecting piece for placing the connecting piece to be welded;

[0007] The interior of the frame is also provided with a CCD component, a conveying component, a welding component, a level detection component and a height detection component which are placed above the jig and arranged in sequence. The CCD component takes a picture to locate the valve body and the connecting piece, the conveying component places the connecting piece to be welded above the valve body, the welding assembly welds the valve body and the connecting piece, the level detection component detects the levelness of the connecting piece after welding, and the height detection component detects the height difference between the connecting piece and the valve body after welding.

[0008] Furthermore, a plurality of lifting assemblies are provided below the working platform, the lifting assemblies are fixedly connected to the working platform and are provided below the jig, and the number of the lifting assemblies matches the number of the jigs.

[0009] Furthermore, the connecting piece is connected to the fixture via a lifting assembly, and the lifting assembly includes a lifting cylinder and a lifting plate, the lifting plate is connected to the movable end of the lifting cylinder, and the top of the lifting plate has a fixed cylinder for placing the connecting piece.

[0010] Furthermore, the CCD assembly includes a slide rail and a detection slider slidably connected to the slide rail. The bottom of the detection slider is provided with a CCD camera to take pictures and locate the positions of the to-be-welded parts of the valve body and the connecting parts.

[0011] Furthermore, the transport assembly includes a push-pull cylinder, a swing rod, and a lifting cylinder and a clamping claw cylinder connected to the swing rod. The push-pull cylinder is fixedly connected to the frame, and the bottom of the push-pull cylinder is provided with a hinged plate rotatably connected to the middle position of the swing rod. One end of the swing rod is rotatably connected to the movable end of the push-pull cylinder, and the other end is connected to the connecting plate below the lifting cylinder. A guide plate is also connected below the lifting cylinder, and the clamping claw cylinder is arranged on the lower surface of the guide plate, wherein;

[0012] Guide rods are also provided on both sides of the lifting cylinder, and the guide rods penetrate the connecting plate and are connected with the guide plate.

[0013] Furthermore, the welding assembly is an annular reflective welding assembly, including a transmission structure and a welding sleeve. The transmission structure is fixedly connected to the frame to control the forward and backward and left and right movement of the welding sleeve. The welding sleeve includes a sleeve body, a concave lens and a refraction block. The concave lens is arranged at the top of the sleeve body, and the refraction block is arranged at the bottom of the sleeve body. The refraction block has a refraction surface for refracting laser, so as to refract the laser beam at the welding point.

[0014] Further, the horizontal detection assembly includes a lifting bracket, a servo motor, a turntable, an elastic sleeve and a ball bearing, the lifting bracket is fixedly connected to the frame, the servo motor is arranged on the lower surface of the lifting bracket, the turntable is connected to the output end of the servo motor, the elastic sleeve is arranged on the lower surface of the turntable and is slidably connected to the turntable, the ball bearing is arranged on the lower surface of the elastic sleeve and is rotatably connected to the elastic sleeve, wherein;

[0015] The horizontal distance from the center of the turntable to the center of the ball is consistent with the radius of the upper surface of the connecting member.

[0016] Furthermore, the height detection assembly includes a transverse adjustment cylinder, a longitudinal adjustment cylinder and a height detection spring, the transverse adjustment cylinder is connected to the frame through a lower fixed plate, the longitudinal adjustment cylinder is arranged at the movable end of the transverse adjustment cylinder, and the height detection spring is connected to the movable end of the longitudinal adjustment cylinder through a first measuring part and a second measuring part, wherein;

[0017] Compression springs are provided above and below the height detection spring. The compression springs are sleeved outside the first measuring part and the second measuring part. The first measuring part is electrically connected to the height detection spring.

[0018] The beneficial effects of the present invention are:

[0019] The device integrates the welding and measurement of the valve body, and completes the detection between multiple points in one device, which improves the processing efficiency and reduces the workload of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0021] Figure 1 It is a schematic diagram of a welding device for an automobile valve body;

[0022] Figure 2 It is a schematic diagram of the interior of the automobile valve body welding device;

[0023] Figure 3 This is the internal schematic diagram of the automobile valve body welding device without the CCD component hidden;

[0024] Figure 4 It is a schematic diagram of the handling assembly of the automobile valve body welding device;

[0025] Figure 5 It is a schematic diagram of another perspective of the handling components of the automobile valve body welding device;

[0026] Figure 6 It is a cross-sectional view of a welding sleeve of an automobile valve body welding device;

[0027] Figure 7 It is a schematic diagram of the horizontal detection component of the automobile valve body welding device;

[0028] Figure 8 This is a partial enlarged view of the horizontal detection component of the automobile valve body welding device;

[0029] Fig. 9 It is a schematic diagram of the height detection component of the automobile valve body welding device;

[0030] Fig.10 It is a schematic diagram of a fixture for a welding device for an automobile valve body;

[0031] Fig.11 It is a working diagram of the height detection component of the automobile valve body welding device.

[0032] The reference numerals in the accompanying drawings are as follows: frame 1, working platform 2, fixture 21, valve body 211, part to be welded 212, first plane 213, lifting assembly 22, connecting piece 23, lifting cylinder 24, lifting plate 25, fixed cylinder 26, CCD assembly 3, slide rail 31, detection slide block 32, transport assembly 4, push-pull cylinder 41, swing rod 42, hinged plate 43, lifting cylinder 44, clamping cylinder 45, guide plate 46, connecting plate 47, guide rod 48, welding assembly 5, welding sleeve 51, sleeve body 52, concave lens 53, refraction block 54, refraction surface 55, horizontal detection assembly 6, lifting bracket 61, servo motor 62, turntable 63, elastic sleeve 64, ball 65, height detection assembly 7, lateral adjustment cylinder 71, longitudinal adjustment cylinder 72, lower fixing plate 73, height detection spring 74, first measuring part 75, second measuring part 76, compression spring 77. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] like Figure 1-11 As shown, the present invention discloses an automobile valve body welding device, comprising:

[0035] A frame 1, wherein an intermittently rotating working platform 2 is provided on the frame 1, and a plurality of jigs 21 for accommodating a valve body 211 are provided on the working platform 2, and a connecting piece 23 for placing a to-be-welded part is provided on one side of the jig 21;

[0036] The interior of the frame 1 is also provided with a CCD component 3, a conveying component 4, a welding component 5, a level detection component 6 and a height detection component 7 which are placed above the fixture 21 and arranged in sequence. The CCD component 3 takes a picture to locate the valve body 211 and the connecting piece 23. The conveying component 4 places the connecting piece 23 to be welded above the valve body 211. The welding component 5 welds the valve body 211 and the connecting piece 23. The level detection component 6 detects the levelness of the connecting piece 23 after welding. The height component detects the height difference between the connecting piece 23 and the valve body 211 after welding.

[0037] In the present invention, the operator places the valve body 211 and the connector 23 on the fixture 21 at the loading station, the equipment is started, and the CCD component 3 takes a photo to locate the valve body 211 and the connector 23; the working platform 2 rotates to set the angle, and the handling component 4 places the connector 23 to be welded above the valve body 211; the working platform 2 rotates, and the welding component 5 performs laser welding on the valve body 211 and the connector 23; the working platform 2 rotates, and the horizontal detection component 6 detects the horizontality of the connector 23 after welding. If the detection is qualified, the next process is carried out. If the detection is unqualified, the detection of the next process is not carried out, and the operator is prompted to take out the workpiece at the loading station; the working platform 2 continues to rotate, and the height detection component 7 detects the height difference between the connector 23 and the valve body 211 after welding. If the detection is qualified, the product is qualified. If the detection is unqualified, the operator is prompted to take out the workpiece at the loading station. The device realizes the welding and detection of the valve body 211, improves the production efficiency of the valve body 211, and reduces the labor burden of the staff.

[0038] During the operation of the device, in order to facilitate the lifting of the valve body 211, a plurality of lifting assemblies (not shown) are arranged below the working platform 2, the lifting assemblies are fixedly connected to the working platform 2, and are arranged below the jig 21, and the number of the lifting assemblies matches the number of the jigs 21. The lifting assemblies rotate together with the working platform 2, which is convenient for subsequent processing.

[0039] In some embodiments of the present invention, Figure 2 , 3 10, the connecting member 23 is connected to the fixture 21 through a lifting assembly 22, the lifting assembly 22 includes a lifting cylinder 24 and a lifting plate 25, the guide plate 46 is connected to the movable end of the lifting cylinder 24, and the top of the lifting plate 25 has a fixed cylinder 26 for placing the connecting member 23. When the connecting member 23 needs to be lifted, the lifting cylinder 24 extends to lift the lifting plate 25 and the connecting member 23, so that the transport assembly 4 can clamp the connecting member 23 to avoid the working stroke of the transport assembly 4 not meeting the working requirements.

[0040] In some embodiments of the present invention, Figure 2 As shown, the CCD assembly 3 includes a slide rail 31 and a detection slider 32 slidably connected to the slide rail 31. The bottom of the detection slider 32 has a CCD camera to take pictures and locate the positions of the to-be-welded portion 212 of the valve body 211 and the connecting member 23. The detection slider is slidably connected on the slide rail 31 to drive the CCD camera to rise or fall.

[0041] In some embodiments of the present invention, Figure 4 , 5As shown, the transport assembly 4 includes a push-pull cylinder 41, a rocker arm 42, a lifting cylinder 44 and a clamping cylinder 45 connected to the rocker arm 42. The push-pull cylinder 41 is fixedly connected to the frame 1, and a hinged plate 43 rotatably connected to the middle position of the rocker arm 42 is provided at the bottom of the push-pull cylinder 41. One end of the rocker arm 42 is rotatably connected to the movable end of the push-pull cylinder 41, and the other end is connected to the connecting plate 47 below the lifting cylinder 44. A guide plate 46 is also connected below the lifting cylinder 44, and the clamping cylinder 45 is arranged on the lower surface of the guide plate 46, wherein; guide rods 48 are also provided on both sides of the lifting cylinder 44, and the guide rods 48 pass through the connecting plate 47 and are connected to the guide plate 46. When the transport assembly 4 is working, the push-pull cylinder 41 retracts, driving the rocker arm 42 to swing, so that the lifting cylinder 44 and the clamping cylinder 45 move to the top of the connecting piece 23, and the lifting cylinder 44 extends, so that the clamping cylinder 45 descends to clamp the connecting piece 23; then the lifting cylinder 44 retracts, and the push-pull cylinder 41 retracts, so that the connecting piece 23 is placed above the welding part of the valve body 211, and the lifting cylinder 44 and the clamping cylinder 45 are driven to dock the connecting piece 23 with the welding part.

[0042] In some embodiments of the present invention, Figure 6 As shown, the welding assembly 5 is an annular reflective welding assembly 5, including a transmission structure (not shown) and a welding sleeve 51. The transmission structure is fixedly connected to the frame 1 to control the forward and backward and left and right movements of the welding sleeve 51. The welding sleeve 51 includes a sleeve body 52, a concave lens 53 and a refraction block 54. The concave lens 53 is arranged at the top of the sleeve body 52, and the refraction block 54 is arranged at the bottom of the sleeve body 52. ​​The refraction block 54 has a refraction surface 55 for refracting the laser to refract the laser beam at the welding point. The rotating laser beam above the concave lens 53 refracts the laser beam through the concave lens 53 and the refraction block 54, so that the laser beam points to the position of the welding point, and the valve body 211 and the connector 23 are welded. This structure can refract the laser beam to any angle or position through the concave lens 53, the convex lens and the refraction block 54, which is convenient for laser welding of products.

[0043] In some embodiments of the present invention, Figure 7 , 8As shown, the horizontal detection component 6 includes a lifting bracket 61, a servo motor 62, a turntable 63, an elastic sleeve 64 and a ball 65. The lifting bracket 61 is fixedly connected to the frame 1, the servo motor 62 is arranged on the lower surface of the lifting bracket 61, the turntable 63 is connected to the output end of the servo motor 62, the elastic sleeve 64 is arranged on the lower surface of the turntable 63 and is slidably connected to the turntable 63, the ball 65 is arranged on the lower surface of the elastic sleeve 64 and is rotatably connected to the elastic sleeve 64, wherein; the horizontal distance from the center of the turntable 63 to the center of the ball 65 is consistent with the radius of the upper surface of the connecting member 23. After the welding assembly 5 completes the welding of the valve body 211, the work platform 2 rotates a set angle to move the valve body 211 to be inspected to the bottom of the horizontal detection assembly 6, and the lifting bracket 61 drives the servo motor 62 to move downward, so that the ball 65 contacts the upper surface of the connecting piece 23, and then the servo motor 62 works to drive the turntable 63 and the ball 65 to rotate. If the connecting piece 23 is not parallel, the ball 65 will cause the elastic sleeve 64 to rise or fall a certain distance, triggering the internal sensing device. This structure has high detection efficiency and high accuracy.

[0044] In some embodiments of the present invention, Fig. 9 , 11 As shown, the height detection assembly 7 includes a transverse adjustment cylinder 71, a longitudinal adjustment cylinder 72 and a height detection spring 74, wherein the transverse adjustment cylinder 71 is connected to the frame 1 through a lower fixing plate 73, the longitudinal adjustment cylinder 72 is arranged at the movable end of the transverse adjustment cylinder 71, and the height detection spring 74 is connected to the movable end of the longitudinal adjustment cylinder 72 through a first measuring part 75 and a second measuring part 76, wherein compression springs 77 are arranged above and below the height detection spring 74, the compression spring 77 is sleeved on the outside of the first measuring part 75 and the second measuring part 76, and the first measuring part 75 is electrically connected to the height detection spring 74. In addition, the side wall of the connecting member 23 is placed between the first measuring part 75 and the second measuring part 76. The lateral adjustment cylinder 71 is used to adjust the lateral position of the height detection spring 74. When the longitudinal adjustment cylinder 72 drives the first measuring part 75 and the second measuring part 76 to move downward, the height detection spring 74 first contacts the upper surface of the connecting member 23. At this time, the longitudinal coordinate of the height detection spring 74 is recorded and the longitudinal coordinate of the first measuring part 75 is reset to zero. Then, the pressure of the compression spring 77 is overcome to continue to move the first measuring part 75 and the second measuring part 76 downward until the first measuring part 75 contacts the first plane 213 of the valve body 211. At this time, the longitudinal coordinate of the first measuring part 75 is recorded. The coordinate value is the height difference. If the value is within the error range, the product is qualified, otherwise it is unqualified. The second measuring part 76 assists the detection of the first measuring part 75 and improves the measurement accuracy of the first measuring part 75.

[0045] The working mode of the present invention is as follows:

[0046] The operator places the valve body 211 and the connecting piece 23 on the fixture 21 at the loading station, the equipment is started, and the CCD component 3 takes a photo to locate the valve body 211 and the connecting piece 23; the working platform 2 rotates to a set angle, so that the valve body 211 rotates to the bottom of the handling component 4, at which time the lifting component lifts the fixture 21, and the lifting cylinder 24 lifts the connecting piece 23, and then the push-pull cylinder 41 retracts, driving the swing rod 42 to swing, so that the lifting cylinder 44 and the clamping claw cylinder 45 move to the top of the connecting piece 23, the lifting cylinder 44 extends, so that the clamping claw cylinder 45 descends, clamps the connecting piece 23, and the lifting cylinder 24 Retract, then the lifting cylinder 44 retracts, the push-pull cylinder 41 retracts, so that the connecting piece 23 is placed above the welding part of the valve body 211, and the lifting cylinder 44 and the clamping cylinder 45 are driven to dock the connecting piece 23 with the welding part; the working platform 2 rotates the set angle to rotate the valve body 211 to the bottom of the welding assembly 5, and the lifting assembly lifts the fixture 21 to allow the connecting piece 23 to enter the welding assembly 5. The rotating laser beam above the concave lens 53 refracts the laser beam through the concave lens 53 and the refraction block 54, so that the laser beam points to the position of the welding point, and the valve body 211 and the connecting piece 23 are welded. If the inspection fails, the inspection of the next process will not be carried out, and the operator will be prompted to take out the workpiece at the loading station; the working platform 2 rotates the set angle to move the valve body 211 to be inspected after welding to the bottom of the horizontal inspection component 6, and the lifting bracket 61 drives the servo motor 62 to move downward, so that the ball 65 contacts the upper surface of the connecting piece 23, and then the servo motor 62 works to drive the turntable 63 and the ball 65 to rotate. If the connecting piece 23 is not parallel, the ball 65 will make the elastic sleeve 64 rise or fall a certain distance to detect its offset; the valve body 211 after the horizontal inspection is rotated to the high Below the height detection component 7, the longitudinal adjustment cylinder 72 drives the first measuring part 75 and the second measuring part 76 to move downward, and the height detection spring 74 first contacts the upper surface of the connecting piece 23. At this time, the longitudinal coordinate of the height detection spring 74 is recorded and the longitudinal coordinate of the first measuring part 75 is reset to zero, and then the pressure of the compression spring 77 is overcome to continue to move the first measuring part 75 and the second measuring part 76 downward until the first measuring part 75 contacts the first plane 213 of the valve body 211. At this time, the longitudinal coordinate of the first measuring part 75 is recorded. The coordinate value is the height difference. If the value is within the error range, the product is qualified.

[0047] For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, all of which fall within the protection scope of the present invention.

Claims

1. An automobile valve body welding device, characterized in that: include: A frame (1), wherein an intermittently rotating working platform (2) is provided on the frame (1), a plurality of jigs (21) for accommodating valve bodies (211) are provided on the working platform (2), and a connecting piece (23) to be welded is provided on one side of the jig (21); The frame (1) is further provided with a CCD component (3), a transport component (4), a welding component (5), a level detection component (6) and a height detection component (7) which are arranged in sequence above the fixture (21); the CCD component (3) takes a photo to locate the valve body (211) and the connecting piece (23); the transport component (4) places the connecting piece (23) to be welded above the valve body (211); the welding component (5) welds the valve body (211) and the connecting piece (23); the level detection component (6) detects the levelness of the connecting piece (23) after welding; and the height detection component (7) detects the height difference between the connecting piece (23) and the valve body (211) after welding.

2. The automobile valve body welding device according to claim 1, characterized in that: A plurality of lifting assemblies are provided below the working platform (2), the lifting assemblies are fixedly connected to the working platform (2) and are provided below the jig (21), and the number of the lifting assemblies matches the number of the jigs (21).

3. The automobile valve body welding device according to claim 1, characterized in that: The connecting piece (23) is connected to the fixture (21) via a lifting assembly (22), wherein the lifting assembly (22) comprises a lifting cylinder (24) and a lifting plate (25), wherein the lifting plate (25) is connected to the movable end of the lifting cylinder (24), and the top of the lifting plate (25) has a fixed cylinder (26) for placing the connecting piece (23).

4. The automobile valve body welding device according to claim 1, characterized in that: The CCD assembly (3) comprises a slide rail (31) and a detection slider (32) slidably connected to the slide rail (31); the bottom of the detection slider (32) is provided with a CCD camera for photographing and locating the position of the to-be-welded portion (212) of the valve body (211) and the connecting piece (23).

5. The automobile valve body welding device according to claim 1, characterized in that: The transport assembly (4) comprises a push-pull cylinder (41), a swing rod (42), a lifting cylinder (44) and a clamping claw cylinder (45) connected to the swing rod (42); the push-pull cylinder (41) is fixedly connected to the frame (1), and a hinge plate (43) rotatably connected to the middle position of the swing rod (42) is provided at the bottom of the push-pull cylinder (41); one end of the swing rod (42) is rotatably connected to the movable end of the push-pull cylinder (41), and the other end is connected to a connecting plate (47) below the lifting cylinder (44); a guide plate (46) is also connected below the lifting cylinder (44); the clamping claw cylinder (45) is provided on the lower surface of the guide plate (46), wherein; Guide rods (48) are also provided on both sides of the lifting cylinder (44), and the guide rods (48) penetrate the connecting plate (47) and are connected to the guide plate (46).

6. The automobile valve body welding device according to claim 1, characterized in that: The welding assembly (5) is an annular reflective welding assembly (5), comprising a transmission structure and a welding sleeve (51); the transmission structure is fixedly connected to the frame (1) to control the forward and backward and left and right movements of the welding sleeve (51); the welding sleeve (51) comprises a sleeve body (52), a concave lens (53) and a refraction block (54); the concave lens (53) is arranged at the top of the sleeve body (52); the refraction block (54) is arranged at the bottom of the sleeve body (52); and the refraction block (54) has a refraction surface (55) for refracting laser light, so as to refract the laser light beam at a welding point.

7. The automobile valve body welding device according to claim 1, characterized in that: The horizontal detection component (6) comprises a lifting bracket (61), a servo motor (62), a turntable (63), an elastic sleeve (64) and a ball (65), wherein the lifting bracket (61) is fixedly connected to the frame (1), the servo motor (62) is arranged on the lower surface of the lifting bracket (61), the turntable (63) is connected to the output end of the servo motor (62), the elastic sleeve (64) is arranged on the lower surface of the turntable (63) and is slidably connected to the turntable (63), and the ball (65) is arranged on the lower surface of the elastic sleeve (64) and is rotatably connected to the elastic sleeve (64), wherein; The horizontal distance from the center of the rotating disk (63) to the center of the ball (65) is consistent with the radius of the upper surface of the connecting member (23).

8. The automobile valve body welding device according to claim 1, characterized in that: The height detection assembly (7) comprises a transverse adjustment cylinder (71), a longitudinal adjustment cylinder (72) and a height detection spring piece (74); the transverse adjustment cylinder (71) is connected to the frame (1) via a lower fixing plate (73); the longitudinal adjustment cylinder (72) is arranged at the movable end of the transverse adjustment cylinder (71); the height detection spring piece (74) is connected to the movable end of the longitudinal adjustment cylinder (72) via a first measuring part (75) and a second measuring part (76); wherein; Compression springs (77) are provided above and below the height detection spring piece (74); the compression springs (77) are sleeved outside the first measuring part (75) and the second measuring part (76); and the first measuring part (75) is electrically connected to the height detection spring piece (74).

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