First workpiece detector for electronic component production

Abstract

The invention discloses a first workpiece detector for electronic component production, which comprises a first workpiece detector body and a detection flying probe hoisted in the first workpiece detector body through a three-axis moving frame, a positioning clamping mechanism is further arranged in the first workpiece detector body, a first conveying belt is arranged between the positioning clamping mechanism and the detection flying probe, and a second conveying belt is arranged between the first conveying belt and the detection flying probe. The two ends of the first conveying belt transversely penetrate out of the feeding port and the discharging port of the first workpiece detector body respectively, a second conveying belt is further arranged on the feeding end side of the first conveying belt, the second conveying belt is covered with a cleaning box, and a strip-shaped air nozzle is installed at the top in the cleaning box. The first conveying belt and the second conveying belt are arranged to drive a to-be-detected first workpiece to be conveyed into the first workpiece detector, the first workpiece is automatically positioned and locked under the action of the positioning and clamping mechanism to be detected, after detection is completed, the first workpiece can be automatically unlocked and conveyed out of the first workpiece detector, the manual participation degree is effectively reduced in the whole feeding and discharging process, efficiency is improved, and the labor intensity of workers is lowered. And the shutdown waiting time of the first workpiece detector is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic component testing, in particular to a first article detector for electronic component production. Background Art

[0002] The fully automatic first article tester is a key piece of equipment used in SMT (surface mount technology) production in the field of modern electronic manufacturing. Its core function is to automatically inspect the first product on the production line to ensure the accuracy and consistency of the production process. The fully automatic first article tester uses a high-precision optical imaging system (such as a high-resolution camera) to shoot the first product from multiple angles, capturing detailed features such as the component's appearance, pin shape, and silkscreen markings. Combined with intelligent algorithms, it can quickly identify component model, position, polarity, and other information, and compare it with preset CAD data or BOM (bill of materials) to ensure that production meets design requirements. It replaces traditional manual inspection methods, avoids human errors, and significantly improves inspection efficiency and accuracy. It can quickly detect problems such as mis-sticking, missing sticking, over-sticking, and under-sticking of materials to prevent the production of batch defective products. It also automatically generates inspection reports, records inspection results and abnormal information, and facilitates subsequent traceability and analysis.

[0003] When using the existing fully automatic first-article tester, it is generally necessary to manually place the first article to be tested at the testing position and fix it for testing. When the next first-article test is required, the first article to be tested that has completed the previous test needs to be taken out first, and then the new first article to be tested needs to be placed at the testing position and fixed. The entire loading and unloading process has a high degree of manual participation, which not only affects the detection efficiency, but also easily causes the fully automatic first-article tester to shut down for a long time. The internal environment is exposed to the outside for a long time and is easily contaminated, which has an adverse effect on subsequent detection.

[0004] Therefore, we propose a first article inspection instrument for electronic component production to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a first article inspection instrument for electronic component production to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A first-article detector for electronic component production includes a detector body and a detection flying probe hoisted in the detector body by a three-axis movable frame. A positioning clamping mechanism is also provided in the first-article detector body, and a conveyor belt 1 is provided between the positioning clamping mechanism and the detection flying probe. The two ends of the conveyor belt 1 respectively pass through the feed port and the discharge port of the first-article detector body horizontally, and a conveyor belt 2 is also provided on the feed end side of the conveyor belt 1. The outer cover of the conveyor belt 2 is provided with a cleaning box, and a strip-shaped air nozzle is installed on the top of the cleaning box. A number of nozzles are evenly installed on the lower end of the air nozzle, and an air pipe is connected to the air nozzle. The inlet and outlet of the cleaning box and the discharge port of the first-article detector body are provided with partitions, and a telescopic part 1 is installed on the partition. A control box is installed on the outer wall of the first-article detector body.

[0008] In a further embodiment, the positioning and clamping mechanism consists of a positioning structure and a clamping structure, and the positioning structure vertically penetrates the conveyor belt one, while the clamping structure is symmetrically distributed on the front and rear sides of the conveyor belt one.

[0009] In a further embodiment, the positioning structure includes a baffle, which is connected to a telescopic part 2 and has a plurality of air holes on its surface. An air pump 1 is connected to the outer wall of the baffle, and the air pump 1 is connected to the air holes through an air duct opened in the baffle.

[0010] In a further embodiment, the clamping structure includes a double-headed screw and a limiting rod parallel to each other, and a motor 2 is installed on the end of the double-headed screw, a pair of sliders are symmetrically slidably sleeved on the outside of the limiting rod, and the double-headed screw passes through the pair of sliders and is threadedly connected to them, and the two sliders have opposite thread rotation directions to the double-headed screw, and a splint is installed on the slider.

[0011] In a further embodiment, a support plate is installed on the splint, and a telescopic member three is installed on the support plate, and the output end of the telescopic member three passes through the bottom of the support plate and is connected to a pressure strip, and the pressure strip slides vertically through the vertical plate of the splint.

[0012] In a further embodiment, a ball seat is fixed on the air pipe, and a reciprocating screw and a light rod pass through the ball seat, and the reciprocating screw and the light rod are parallel to the transmission direction of the conveyor belt 2, and the end of the reciprocating screw is connected to the motor 1.

[0013] In a further embodiment, a guide hopper is provided under the cleaning box, and the guide hopper is connected to an induced draft fan through a pipeline, and a filter layer is provided at the air outlet end of the induced draft fan, and an air outlet is provided on the outer wall of the cleaning box.

[0014] In a further embodiment, the air outlet is close to the main control room of the first article detector body.

[0015] In a further embodiment, a vertebral cover is installed on the guide bucket through a support, and an electromagnetic ring is installed on the vertebral cover. A spring and a bellows expansion tube that are interconnected are installed inside the electromagnetic ring, and the outer sides of the upper ends of the bellows expansion tube and the spring are connected to a metal cover. The top ends of the bellows expansion tube and the metal cover are connected to a support plate, and the lower end of the bellows expansion tube passes through the vertebral cover and is connected to the second vacuum pump. A through hole is provided on the support plate, and the through hole is connected to the second vacuum pump through the bellows expansion tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides conveyor belt 1 and conveyor belt 2 to drive the first piece to be tested to be transmitted to the first piece detector, and automatically position and lock it under the action of the positioning and clamping mechanism to wait for detection. After the detection is completed, it can be automatically unlocked and transmitted out of the first piece detector. The entire loading and unloading process effectively reduces manual participation, not only eliminating the trouble of manual positioning, but also improving efficiency and reducing the downtime and waiting time of the first piece detector.

[0018] The present invention sets up a conveyor belt. During the transmission and loading process, the surface of the first piece to be tested can be blown and cleaned through the air nozzle in the cleaning box to improve the cleanliness of the surface of the first piece to be tested, which is beneficial to reduce the contamination of the flying probe during its detection, thereby improving the accuracy of the detection results.

[0019] The cleaning box provided in the present invention can also drain the turbid airflow generated when the first piece to be tested is cleaned, thereby preventing it from overflowing and polluting the internal components of the first piece detector. At the same time, the built-in filter layer of the cleaning box can filter and clean the turbid airflow, so that the discharged airflow is cleaner. At the same time, when the airflow is discharged, it can also act on the outside of the main control room of the first piece detector, so as to accelerate the heat dissipation inside the first piece detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the right front structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the left front structure of the present invention;

[0022] Figure 3 Schematic diagram of the internal structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the installation structure of the conveyor belt 2 and the cleaning box of the present invention;

[0024] Figure 5 This is a schematic diagram of the inner cross-sectional structure of the lower half of the cleaning box of the present invention;

[0025] Figure 6 This is a structural diagram of the upper half of the cleaning box and the upper half of the first article detector body of the present invention;

[0026] Figure 7 This is a schematic diagram of the positioning structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the clamping structure of the present invention;

[0028] Figure 9 This is a schematic diagram of the installation structure of the splint and the pressure plate of the present invention.

[0029] Figure: 1. First article inspection instrument body; 2. Flying probe for inspection; 3. Three-axis moving frame; 4. Positioning and clamping mechanism; 41. Positioning structure; 411. Stop platform; 412. Telescopic component 2; 413. Air hole; 414. Vacuum pump 1; 42. Clamping structure; 421. Double-headed screw; 422. Limiting rod; 423. Motor 2; 424. Slider; 425. Clamping plate; 426. Support plate; 427. Pressure strip; 428. Telescopic component 3; 5. Conveyor belt 1; 6. Conveyor belt 2; 7. Cleaning box; 8. Control box; 9. Partition; 10. Telescopic part 1; 11. Nozzle; 12. Nozzle; 13. Air pipe; 14. Ball seat; 15. Reciprocating screw; 16. Polished rod; 17. Motor 1; 18. Flexible spacer; 19. Guide hopper; 20. Induced draft fan; 21. Filter layer; 22. Air outlet; 23. Cone cover; 24. Electromagnetic ring; 25. Metal cover; 26. Support plate; 27. Corrugated telescopic tube; 28. Spring; 29. Vacuum pump 2. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figure 1-4 , a first article detector for electronic component production, comprising a first article detector body 1 and a detection flying probe 2, the detection flying probe 2 is hoisted on the top of the first article detector body 1 through a three-axis moving frame 3, the three-axis moving frame 3 is made of a servo ball screw structure of X, Y, and Z axes, so that the detection flying probe 2 can be controlled to move along multiple axes, a positioning clamping mechanism 4 is also provided in the first article detector body 1, and a conveyor belt 1 5 is provided between the positioning clamping mechanism 4 and the detection flying probe 2, the two ends of the conveyor belt 1 5 respectively pass through the feed port and the discharge port of the first article detector body 1 horizontally, and a conveyor belt 2 6 is further provided on the feed end side of the conveyor belt 1 5, the conveyor belt 2 6 is parallel to the conveyor belt 1 5, and both are spliced by two narrow belts, and the middle of the two narrow belts is hollowed out to facilitate the arrangement of other structures, the conveyor belt The outer cover of the conveyor belt 2 6 is provided with a cleaning box 7, and a strip-shaped air nozzle 11 is installed on the top of the cleaning box 7. The air nozzle 11 is tilted downward, and a number of nozzles 12 are evenly installed on the lower end of the air nozzle 11 along the length direction, and the air nozzle 11 is connected to an air pipe 13. The air pipe 13 passes through the outside of the cleaning box 7 and is connected to an air supply source device (not shown in the figure) so that the nozzle 12 can spray out a pressurized air flow, thereby blowing and cleaning the first piece to be tested that is transmitted on the conveyor belt 1 5 and passes under the air nozzle 11. The inlet and outlet of the cleaning box 7 and the discharge port of the first piece detector body 1 are both provided with partitions 9, which are convenient for separating the environment inside the box from the external environment when the cleaning box 7 or the first piece detector body 1 is working, thereby reducing pollution, and a telescopic part 10 is installed on the partition 9 to drive the partition 9 to move up and down.

[0034] See also Figure 7 In order to facilitate the clamping and positioning of the first piece to be tested, a positioning and clamping mechanism 4 is set up, which consists of a positioning structure 41 and a clamping structure 42, and the positioning structure 41 vertically penetrates the conveyor belt 1 5. The positioning structure 41 includes a baffle 411. The length direction of the baffle 411 is perpendicular to the conveying direction of the conveyor belt 1 5. The baffle 411 is connected to the telescopic part 2 412 under it. The telescopic part 2 412 is fixedly connected to the first piece detector body 1. Specifically, when the baffle 411 is raised, it can block the first piece to be tested transmitted on the conveyor belt 2 6, thereby controlling it to be unable to move further.

[0035] See also Figure 7, considering that when the first piece to be measured contacts the stop 411, it will form an impact under the action of inertia and rebound a certain distance. To prevent its rebound and retraction and improve the positioning accuracy, a number of air holes 413 are provided on the side surface of the stop 411 close to the incoming piece direction. An air pump 414 is connected to the outer side wall of the stop 411, and the air pump 414 is connected to the air holes 413 through an air passage provided in the stop 411, so that when the first piece to be measured contacts the stop 411, it can be sucked by the air holes 413 to prevent its rebound and retraction.

[0036] Please refer to Figure 8 , the clamping structure 42 includes a double-headed screw 421 and a limiting rod 422 that are parallel to each other. An electric motor 423 is installed at the end of the double-headed screw 421. The double-headed screw 421 is rotatably connected to the first-piece detector body 1, and the electric motor 423 is fixedly connected to the first-piece detector body 1. A pair of sliders 424 are symmetrically sleeved on the outer side of the limiting rod 422. The double-headed screw 421 passes through the pair of sliders 424 and is threadedly connected thereto. The threads of the two sliders 424 and the double-headed screw 421 have opposite directions. A clamping plate 425 is installed on the slider 424, so that when the clamping plate 425 clamps the first piece to be measured, the first piece is always kept in the center position. The clamping plate 425 is of an L-shaped structure. The clamping plates 425 are symmetrically distributed on the front and rear sides of the first conveyor belt 5, and the lower edge of the clamping plate 425 is close to the upper surface of the first conveyor belt 5, so that when the clamping plate 425 moves, it can be as close as possible to the upper surface of the first conveyor belt 5 without friction with it.

[0037] Please refer to Figure 9 , considering that the first piece to be measured is relatively thin, and only clamped by the side, the clamping area is small, and it is still easy to have the problem of shaking and instability during detection. A horizontal support plate 426 is installed on the opposite side of the clamping plate 425. A telescopic member 428 is installed on the support plate 426, and the output end of the telescopic member 428 passes through the lower part of the support plate 426 and is connected to a pressure bar 427. The pressure bar 427 is of a U-shaped structure, and the two extended parts of the pressure bar 427 vertically slide through the vertical plate of the clamping plate 425, so that when the clamping plate 425 clamps the first piece to be measured, the pressure bar 427 can press the first piece to be measured from above to firmly fix and lock its position.

[0038] Further, please refer to Figure 6The end of the reciprocating screw 15 is connected to the motor 17, and the motor 17 is fixedly connected to the cleaning box 7, so as to facilitate the rotation of the reciprocating screw 15 to drive the ball seat 14, the air pipe 13 and the air nozzle 11 to move horizontally, thereby increasing the blowing area. Specifically, in order to ensure that the air pipe 13 can be stably supplied with air during the movement, the part of the air pipe 13 passing through the bottom of the ball seat 14 is a hard pipe, and the part of the air pipe 13 passing through the top of the ball seat 14 is a flexible hose, and a margin is placed in the cleaning box 7 to ensure that the air pipe 13 is not excessively pulled during the movement.

[0039] See also Figure 5 In order to prevent the turbid airflow at the purging location from polluting the external environment and the internal space of the first-piece detector body 1, it is set that during purging cleaning, the partitions 9 on both sides of the cleaning box 7 are closed, and a guide bucket 19 is provided under the cleaning box 7, and the guide bucket 19 is connected to the induced draft fan 20 through a pipe, and the air outlet end of the induced draft fan 20 is provided with a filter layer 21. Specifically, the filter layer 21 is an activated carbon filter mesh, and the filter layer 21 is integrated on a detachable inspection plate, which can be pulled out relative to the cleaning box 7 to facilitate the replacement of the filter layer 21. An air outlet 22 is provided on the outer wall of the cleaning box 7 to facilitate the adsorption and filtration of the turbid airflow before discharge. By placing the air outlet 22 close to the main control room of the first-piece detector body 1, the airflow can also act on the outside of the main control room of the first-piece detector when discharged, so as to accelerate the heat dissipation in the first-piece detector.

[0040] See also Figure 5, considering that the nozzle 11 affects the stability of the first piece to be tested on the conveyor belt 2 6 when it is moving and blowing, in order to prevent it from falling, a cone cover 23 is installed on the guide bucket 19 through a pillar, and an electromagnetic ring 24 is installed on the outer side of the cone cover 23, and a spring 28 and a bellows telescopic tube 27 that are connected to each other are installed on the inner side of the cone cover 23. The bellows telescopic tube 27 is on the inner side of the spring 28, and the outer side of the upper end of the bellows telescopic tube 27 and the spring 28 is connected to the metal cover 25. The top of the bellows telescopic tube 27 and the metal cover 25 is connected to a support plate 26. The support plate 26 is between the two narrow belts of the conveyor belt 2 6, and the lower end of the bellows telescopic tube 27 passes through The vertebral cover 23 is connected to the second vacuum pump 29. A through hole is provided on the support plate 26, and the through hole is connected to the second vacuum pump 29 through the corrugated telescopic tube 27. When the electromagnetic ring 24 adsorbs the metal cover 25, the spring 28 is in a compressed state. At this time, the support plate 26 is lower than the upper surface of the conveyor belt 26, which does not affect the normal transmission of the first piece to be tested. When the electromagnetic ring 24 loses its magnetic force and does not adsorb the metal cover 25, the support plate 26 rebounds and rises under the action of the spring 28, so that it can contact the lower surface of the first piece to be tested. At this time, the second vacuum pump 29 is started, and the first piece to be tested can be adsorbed on the support plate 26, so that it will not shift during the moving and blowing process.

[0041] See also Figure 1-3 and Figure 7-9 In order to better realize the automatic control coordination of the entire device, a control box 8 is installed on the outer wall of the first-piece detector body 1, and a PLC controller is arranged in the control box 8. The contact surfaces of the splint 425, the pressure strip 427, the stopper 411 and the support plate 26 with the first piece to be tested are all provided with flexible spacers 18, and the flexible spacers 18 are embedded with piezoelectric sensors to facilitate the detection of contact pressure. The piezoelectric sensors are electrically connected to the PLC controller, so that when the support plate 26 contacts the first piece to be tested, the PLC controller controls the vacuum pump 29 to work, when the stopper 411 contacts the first piece to be tested, the PLC controller controls the vacuum pump 1 414 and the motor 2 423 to work, when the splint 425 contacts the first piece to be tested, the PLC controller controls the motor 2 423 to stop, and at the same time controls the telescopic part 3 428 to start, and when the pressure strip 427 contacts the first piece to be tested, the PLC controller controls the telescopic part 3 428 to stop, thereby realizing automatic positioning and locking.

[0042] In addition, the telescopic parts in the device can be, but are not limited to, electric push rods, air cylinders or hydraulic cylinders.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0044] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A first article tester for electronic component production, comprising a first article tester body (1) and a flying probe (2) mounted in the first article tester body (1) via a three-axis movable frame (3), characterized in that: A positioning clamping mechanism (4) is also provided in the first piece detector body (1), and a conveyor belt (5) is provided between the positioning clamping mechanism (4) and the detection flying needle (2), the two ends of the conveyor belt (5) respectively pass through the feed port and the discharge port of the first piece detector body (1), and a conveyor belt (6) is also provided on the feed end side of the conveyor belt (5), the outer cover of the conveyor belt (6) is provided with a cleaning box (7), and a strip-shaped air nozzle (11) is installed on the top of the cleaning box (7), a plurality of nozzles (12) are evenly installed at the lower end of the air nozzle (11), and an air pipe (13) is connected to the air nozzle (11), the inlet and outlet of the cleaning box (7) and the discharge port of the first piece detector body (1) are provided with a partition (9), and a telescopic part (10) is installed on the partition (9), and a control box (8) is installed on the outer wall of the first piece detector body (1).

2. The first article inspection instrument for electronic component production according to claim 1, characterized in that: The positioning and clamping mechanism (4) is composed of a positioning structure (41) and a clamping structure (42), and the positioning structure (41) vertically penetrates the conveyor belt (5), while the clamping structure (42) is symmetrically distributed on the front and rear sides of the conveyor belt (5).

3. The first article inspection instrument for electronic component production according to claim 1, characterized in that: The positioning structure (41) includes a baffle (411), which is connected to the telescopic part 2 (412) at the bottom of the baffle (411), and a plurality of air holes (413) are provided on the surface of the baffle (411). An air pump 1 (414) is connected to the outer wall of the baffle (411), and the air pump 1 (414) is communicated with the air holes (413) through an air channel provided in the baffle (411).

4. The first article inspection instrument for electronic component production according to claim 1, characterized in that: The clamping structure (42) includes a double-headed screw (421) and a limiting rod (422) that are parallel to each other, and a second motor (423) is installed at the end of the double-headed screw (421). A pair of sliders (424) are symmetrically slidably sleeved on the outside of the limiting rod (422), and the double-headed screw (421) passes through the pair of sliders (424) and is screwed thereto, and the two sliders (424) have opposite screw threads to the double-headed screw (421), and a clamping plate (425) is installed on the slider (424).

5. The first article inspection instrument for electronic component production according to claim 4, characterized in that: A supporting plate (426) is installed on the clamping plate (425), and a telescopic member (428) is installed on the supporting plate (426). The output end of the telescopic member (428) passes through the bottom of the supporting plate (426) and is connected to a pressure strip (427). The pressure strip (427) vertically slides through the vertical plate of the clamping plate (425).

6. The first article inspection instrument for electronic component production according to claim 1, characterized in that: A ball seat (14) is fixed on the air pipe (13), and a reciprocating screw (15) and a polished rod (16) are passed through the ball seat (14). The reciprocating screw (15) and the polished rod (16) are parallel to the transmission direction of the conveyor belt 2 (6), and the end of the reciprocating screw (15) is connected to the motor 1 (17).

7. The first article inspection instrument for electronic component production according to claim 1, characterized in that: A flow guide hopper (19) is provided below the cleaning box (7), and the flow guide hopper (19) is connected to an induced draft fan (20) through a pipeline. A filter layer (21) is provided at the air outlet end of the induced draft fan (20), and an air outlet (22) is provided on the outer side wall of the cleaning box (7).

8. The first article inspection instrument for electronic component production according to claim 7, characterized in that: The air outlet (22) is close to the main control room of the first piece detector body (1).

9. The first article inspection instrument for electronic component production according to claim 7, characterized in that: A vertebral cover (23) is installed on the guide hopper (19) through a support, and an electromagnetic ring (24) is installed on the vertebral cover (23). A spring (28) and a bellows telescopic tube (27) that are connected to each other are installed inside the electromagnetic ring (24). The outer sides of the upper ends of the bellows telescopic tube (27) and the spring (28) are connected to the metal cover (25). The top ends of the bellows telescopic tube (27) and the metal cover (25) are connected to a support plate (26), and the lower end of the bellows telescopic tube (27) passes through the vertebral cover (23) and is connected to an air pump (29). A through hole is provided on the support plate (26), and the through hole is connected to the air pump (29) through the bellows telescopic tube (27).

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