CN117110844B - An integrated circuit board vibration testing device - Google Patents

Abstract

The invention relates to the technical field of integrated circuit board testing, in particular to an integrated circuit board vibration testing device, which comprises a base and a top table arranged on the upper side of the base, and further comprises: the clamping mechanism is arranged on the upper side of the top table and used for synchronously clamping a plurality of integrated circuit boards of the same type; the vibration mechanism is arranged between the base and the top platform and is used for stably vibrating the top platform, the clamping mechanism adopted by the invention can effectively improve the testing efficiency of the integrated circuit board, shorten the shipment time of the integrated circuit board, effectively prolong the service life of the motor, reduce the maintenance times and lower the use cost, and the electric push rod and the rotary seat adopted by the invention can test the influence of different jacking forces on the integrated circuit board by utilizing different distances between the jacking head and the top platform.

Description

An integrated circuit board vibration testing device

Technical field

The invention relates to the technical field of integrated circuit board testing, and in particular to an integrated circuit board vibration testing device.

Background technique

Integrated circuit board vibration testing is a testing method used to evaluate the reliability and performance of circuit boards in a vibration environment. It simulates the vibration stress that the circuit board may suffer during transportation, installation and use to ensure that the circuit board It can work normally without malfunction under these conditions.

Most existing integrated circuit board vibration testing devices use a structure in which a motor drives an eccentric block to move. The rotational inertia of the eccentric block causes the motor to vibrate. The vibration of the motor is used to drive the integrated circuit board mounting table to oscillate. In this vibration mode, the motor is vibrated. The impact is large, affecting the service life of the motor and causing high maintenance costs. At the same time, the existing test device is only suitable for a single test and is not suitable for vibration testing of batch integrated circuit boards, which will affect the shipment time of batch integrated circuit boards.

Contents of the invention

Technical problem to be solved: The invention provides an integrated circuit board vibration testing device that can solve the above-mentioned problems.

Technical solution: In order to achieve the above object, the present invention adopts the following technical solution. An integrated circuit board vibration testing device includes a base and a top platform located on the upper side of the base. The integrated circuit board vibration testing device also includes: a clamping mechanism. , is located on the upper side of the top table, and is used to synchronously hold and clamp multiple integrated circuit boards of the same type; the vibration mechanism is located between the base and the top table, and is used to vibrate the top table smoothly.

The clamping mechanism includes a number of clamping base groups arranged equidistantly inside the upper side of the top table. The clamping base group is composed of a forward clamping base and a reverse clamping base distributed symmetrically. Both the forward clamping base and the reverse clamping base are L-shaped. In cross section, the bottoms of the forward clamp seat and the reverse clamp seat are symmetrically fixed and connected with connecting blocks. The two connecting blocks on the front side of the forward clamp seat and the reverse clamp seat in the same clamp seat group are both slidingly connected to the guide rod. , the guide rod is fixedly connected in the top table, and the two connecting blocks on the rear side of the forward clamp seat and the reverse clamp seat in the same clamp seat group are symmetrically threaded and connected to the two-way screw rod segments, and each two-way screw rod segment is connected to form the first Two rotating shafts, the second rotating shaft is rotatably connected in the top table, and the top table is also provided with a lifting piece for ejecting the integrated circuit board after the vibration test.

The vibration mechanism includes a central support tube fixedly connected to the center of the top of the base. The central support tube is provided with an ejection component for ejection of the top table. The central support tube is also provided with a control for ejection control of the ejection component. components.

As a preferred technical solution of the present invention, a number of support members for supporting the top table are provided at circumferential equal distances between the base and the top table. The support members include an upper connecting seat fixedly connected to the bottom of the top table; The lower connecting seat is fixedly connected to the upper side of the base, and the upper connecting seat and the lower connecting seat are connected through a support spring.

As a preferred technical solution of the present invention, the jacking member includes a plurality of first rotating shafts rotatably connected inside the top table, and the first rotating shafts are fixedly connected to eccentrics at positions corresponding to the middle part of the clamping base group.

As a preferred technical solution of the present invention, a rotary torsion spring is also installed at the connection position between the first rotating shaft and the top table.

As a preferred technical solution of the present invention, a first rotating handle is fixedly connected to one end of the first rotating shaft, and a second rotating handle is fixedly connected to one end of the second rotating shaft. The surfaces of the first rotating handle and the second rotating handle All have anti-slip texture.

As a preferred technical solution of the present invention, the knocking assembly includes a connecting ring fixedly connected to the lower side of the central support cylinder. The ring edges of the connecting ring are fixedly connected to several support block groups at equal distances. The outer ends of the support block groups are fixedly connected with Square frame, the centers of the four sides of the square frame are rotatably connected with swivel sleeves, and the swivel sleeve is fixedly connected with a connecting arm. The end of the connecting arm away from the swivel sleeve is hinged to the bottom of the ejector rod. The upper end of the ejector rod is fixedly connected with an ejection head. The head is made of rubber, and a wheel frame is fixedly connected to the side of the hitting head. Four groups of wheel frames are distributed in a cross shape, and rollers are connected to the wheel frame for rotation.

As a preferred technical solution of the present invention, a downward pressure torsion spring is installed at the connection position between the rotating sleeve and the square frame.

As a preferred technical solution of the present invention, the control assembly includes an upper connecting frame fixedly connected to the top of the central support cylinder. The upper connecting frame is rotatably connected to a central gear. The bottom center of the central gear is fixedly connected to the output end of the driving motor. On the top, the driving motor is fixedly connected to the bottom of the upper connecting frame. There are four sets of rotating gears equidistantly meshed around the center gear. Each rotating gear is distributed correspondingly to the square frame. The rotating gears are rotationally connected to the upper connecting frame. There is a jacking cylinder in the center of the rotating gear. Each ejector rod on the same square frame passes through the correspondingly distributed jacking cylinders. The top edge of the jacking cylinder rolls in contact with each roller in the same square frame. The top of the jacking cylinder The top is provided with smooth protrusions, which account for 1/4 of the top edge of the jacked-up cylinder.

As a preferred technical solution of the present invention, the outer wall of the jacking cylinder is fixedly connected with a number of limiting protrusions, and the inner hole wall of the rotating gear is provided with a chute corresponding to each of the limiting protrusions, and the limiting protrusions are slidingly connected. In the chute, the bottom of the lifting cylinder is fixedly connected with a swivel base. The swivel base is rotationally connected to the lower connecting frame. The lower connecting frame is slidingly connected to the central support tube. The bottom of the lower connecting frame is fixedly connected to the output ends of several electric push rods. , the electric push rod is fixedly connected to the connecting ring.

Beneficial effects: 1. The clamping mechanism used in the present invention can clamp multiple integrated circuit boards at one time, reduce the testing time of a batch of integrated circuit boards, effectively improve the testing efficiency of integrated circuit boards, and shorten the testing time of integrated circuit boards. delivery time.

2. The vibration mechanism used in the present invention can vibrate the top table stably by periodically changing the four-point position and synchronously striking it. Compared with the traditional eccentric block vibration, the motor is less affected by vibration and can effectively extend the The service life of the motor is reduced, the number of maintenance times is reduced, and the use cost is lower.

3. The electric push rod and swivel base used in the present invention can use the electric push rod to electrically control the lifting of the jacking cylinder, reduce the distance between the jacking head and the jacking table, and utilize the space between the jacking head and the jacking table. Different distances and different impact forces are tested to produce different degrees of vibration on the integrated circuit board.

Description of the drawings

The present invention will be further described below in conjunction with the accompanying drawings and examples.

Figure 1 is a schematic three-dimensional structural diagram of the present invention from a first perspective.

Figure 2 is a schematic rear structural view of the clamping mechanism of the present invention.

Figure 3 is a schematic back view of the three-dimensional structure of the clamping mechanism of the present invention.

Figure 4 is a schematic three-dimensional structural diagram of the vibration mechanism and the support member of the present invention.

Figure 5 is a schematic three-dimensional structural diagram of the knocking assembly of the present invention.

Figure 6 is a schematic three-dimensional structural diagram of the control assembly of the present invention from a first perspective.

Figure 7 is a schematic three-dimensional structural diagram of the control assembly of the present invention from a second perspective.

Figure 8 is a schematic three-dimensional structural diagram of the support member of the present invention.

In the figure: 1. Base; 2. Support piece; 21. Upper connecting seat; 22. Support spring; 23. Lower connecting seat; 3. Clamping mechanism; 31. Lifting piece; 311. First rotating shaft; 312. One rotating handle; 313, eccentric wheel; 32, second rotating handle; 33, second rotating shaft; 34, two-way screw rod section; 35, connecting block; 36, clamp seat group; 361, forward clamp seat; 362, reverse Clamp seat; 37. Guide rod; 4. Ejection table; 5. Vibration mechanism; 51. Ejection assembly; 511. Ejection head; 512. Wheel frame; 513. Roller; 514. Ejection rod; 515. Connecting arm; 516. Swivel sleeve; 517. Square frame; 518. Support block group; 519. Connecting ring; 52. Control component; 5201. Center gear; 5202. Smooth protrusion; 5203. Jacking cylinder; 5204. Limiting rib ; 5205, rotating gear; 5206, lower connecting frame; 5207, upper connecting frame; 5208, swivel base; 5209, center support; 5210, driving motor; 5211, electric push rod.

Detailed ways

The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

Referring to Figure 1, an integrated circuit board vibration testing device includes a base 1 and a top platform 4 located on the upper side of the base 1. The integrated circuit board vibration testing device also includes a clamping mechanism 3 located on the top platform 4. The side is used to synchronously hold and clamp multiple integrated circuit boards of the same type; the vibration mechanism 5 is located between the base 1 and the top table 4, and is used to vibrate the top table 4 stably.

Referring to Figures 1, 2 and 3, the clamping mechanism 3 includes a number of clamping base groups 36 equidistantly arranged inside the upper side of the top table 4. The clamping base group 36 consists of a forward clamping base 361 and a reverse clamping base. 362 are symmetrically distributed. The forward clamp base 361 and the reverse clamp base 362 are both L-shaped cross-sections. The bottoms of the forward clamp base 361 and the reverse clamp base 362 are symmetrically fixed with connecting blocks 35. In the same clamp base group 36 The two connecting blocks 35 on the front side of the forward clamp seat 361 and the reverse clamp seat 362 are both slidingly connected to the guide rod 37. The guide rod 37 is fixedly connected in the top table 4. The forward clamp seats in the same clamp seat group 36 are The two connecting blocks 35 on the rear side of the seat 361 and the reverse clamp seat 362 are symmetrically threaded and connected to the two-way screw segments 34. Each two-way screw segment 34 is connected to form a second rotating shaft 33. The second rotating shaft 33 is rotationally connected to the top table 4 Inside, the top table 4 is also provided with a lifting piece 31 for pushing out the integrated circuit board after the vibration test.

During specific operation, the plurality of clamping base groups 36 are controlled to move synchronously through the rotation of the second rotating shaft 33, and the integrated circuit board is clamped by using the relative movement of the forward clamping base 361 and the reverse clamping base 362.

Referring to Figures 1, 4, 6 and 7, the vibration mechanism 5 includes a central support tube 5209 fixedly connected to the center of the top of the base 1. The central support tube 5209 is provided with an ejection lever for ejection of the top platform 4. Assembly 51, the central support cylinder 5209 is also provided with a control assembly 52 for controlling the lifting of the striking assembly 51.

Referring to Figures 1, 4 and 8, a number of support members 2 for supporting the top platform 4 are provided at equidistant circumferences between the base 1 and the top platform 4. The support members 2 include fixedly connected to the top platform 4 There is an upper connecting seat 21 at the bottom and a lower connecting seat 23 fixedly connected to the upper side of the base 1. The upper connecting seat 21 and the lower connecting seat 23 are connected through a support spring 22.

During specific work, the top table 4 is flexibly supported by the elasticity of the support spring 22, which is beneficial to the vibration of the top table 4.

Referring to FIGS. 1 and 3 , the lifting member 31 includes a plurality of first rotating shafts 311 that are rotatably connected inside the top table 4 . The first rotating shafts 311 are fixedly connected to an eccentric 313 at a position corresponding to the middle part of the clamping base group 36 .

During specific operation, the rotation of the eccentric wheel 313 is controlled by the rotation of the first rotating shaft 311, and the centrifugal distal end of the eccentric wheel 313 lifts up the integrated circuit board to facilitate the removal of the integrated circuit board.

Referring to FIG. 3 , a rotary torsion spring is installed at the connection position between the first rotating shaft 311 and the top table 4 .

During specific work, the first rotating shaft 311 is automatically reset by rotating the torsion spring to prevent the eccentric wheel 313 from actively tilting and affecting the placement of the integrated circuit board.

Referring to Figures 1, 2 and 3, one end of the first rotating shaft 311 is fixedly connected to a first rotating handle 312, one end of the second rotating shaft 33 is fixedly connected to a second rotating handle 32, and the first rotating handle 312 and The surface of the second handle 32 is provided with anti-skid patterns (anti-skid patterns are an existing technology and are not shown in the illustration).

During specific operation, the first rotating shaft 311 is rotated through the first rotating handle 312 , and the second rotating shaft 33 is rotated through the second rotating handle 32 .

Referring to Figures 1, 4, 5, 6 and 7, the knocking assembly 51 includes a connecting ring 519 fixedly connected to the underside of the central support tube 5209, and the edges of the connecting ring 519 are fixedly connected to several supporting blocks at equal intervals. Group 518, the outer end of the support block group 518 is fixedly connected to a square frame 517. The centers of the four sides of the square frame 517 are all rotatably connected to a rotating sleeve 516. The rotating sleeve 516 is fixedly connected to a connecting arm 515, and the connecting arm 515 is away from one end of the rotating sleeve 516. Hinged at the bottom of the ejector rod 514, the upper end of the ejector rod 514 is fixedly connected with an ejection head 511. The ejection head 511 is made of rubber. The side of the ejection head 511 is fixedly connected with a wheel frame 512. Four groups of wheel frames 512 are distributed in a cross shape. , a roller 513 is rotatably connected in the wheel frame 512.

A downward pressure torsion spring is also installed at the connection position between the rotating sleeve 516 and the square frame 517.

The control assembly 52 includes an upper connecting frame 5207 fixedly connected to the top of the central support tube 5209. The upper connecting frame 5207 is rotatably connected to a central gear 5201. The bottom center of the central gear 5201 is fixedly connected to the output end of the driving motor 5210. The driving motor 5210 Fixedly connected to the bottom of the upper connecting frame 5207, there are four sets of rotating gears 5205 equidistantly meshed around the center gear 5201. Each rotating gear 5205 is distributed correspondingly to the square frame 517. The rotating gears 5205 are rotatably connected to the upper connecting frame 5207. On the top, there is a jacking cylinder 5203 in the center of the rotating gear 5205. Each ejector rod 514 on the same square frame 517 passes through the correspondingly distributed jacking cylinders 5203. The top edge of the jacking cylinder 5203 rolls in contact with the same square frame 517. Each roller 513 inside is provided with a smooth protrusion 5202 on the top of the lifting cylinder 5203, and the smooth protrusion 5202 accounts for 1/4 of the top edge of the lifting cylinder 5203.

The outer wall of the jacking cylinder 5203 is fixedly connected with a number of limiting protrusions 5204. The inner hole wall of the rotating gear 5205 has chute corresponding to each limiting protrusion 5204. The limiting protrusion 5204 is slidingly connected in the chute. The bottom of the cylinder 5203 is fixedly connected with a swivel base 5208. The swivel base 5208 is rotationally connected to the lower connecting frame 5206. The lower connecting frame 5206 is slidingly connected to the central support tube 5209. The bottom of the lower connecting frame 5206 is fixedly connected to the outputs of several electric push rods 5211. end, the electric push rod 5211 is fixedly connected to the connecting ring 519.

During specific work, the driving motor 5210 is used to control the rotation of the center gear 5201, and the center gear 5201 is linked to the rotation of each rotating gear 5205. The rotating gear 5205 drives the lifting cylinder 5203 to rotate through the action of the limiting protrusion 5204, thereby lifting the cylinder. The smooth protrusions 5202 of 5203 continuously lift any roller 513 in the same square frame 517 upwards. It should be noted that by selecting the rollers 513 with appropriate length specifications, it is ensured that during the movement, all rollers 513 in the same square frame 517 Neither of them will break away from the top edge of the corresponding jacking cylinder 5203. The raised hitting head 511 moves upward due to inertia to hit the top table 4. The movement of the hitting head 511 changes the tilt angle through the linkage connecting arm 515 of the pushing rod 514. The downward pressure torsion spring can press the push rod 514 downward to keep the roller 513 in close contact with the top of the lifting cylinder 5203. The electric push rod 5211 operates to control the lower connecting frame 5206 to slide along the center support tube 5209. The lower connecting frame 5206 drives the jacking cylinder 5203 to move up and down in the inner hole of the rotating gear 5205 through the rotating seat 5208. The roller 513 will change the height with the jacking cylinder 5203, and the blocked distance of the inertial motion of the jacking head 511 will also change. Change the intensity of the blow.

During operation: S1: Firstly, multiple integrated circuit boards are placed in the clamping base group 36, the second rotating shaft 33 is rotated through the second rotating handle 32, and the multiple clamping base groups 36 are controlled to move synchronously through the rotation of the second rotating shaft 33. The integrated circuit board is clamped by the relative movement of the forward clamping base 361 and the reverse clamping base 362 .

S2: Run the drive motor 5210, and control the rotation of the center gear 5201 through the drive motor 5210. The center gear 5201 links each rotating gear 5205 to rotate. The rotating gear 5205 drives the lifting cylinder 5203 to rotate through the action of the limiting ridge 5204. The smooth protrusion 5202 of the lifting cylinder 5203 continuously lifts any roller 513 in the same square frame 517 upward, and the raised wheel frame 512 drives the hitting head 511 to move upward to hit the top table 4, and the top table 4 will To generate steady vibration and need to change the strength of the jacking, the lower connecting frame 5206 is controlled by the operation of the electric push rod 5211 to slide along the central support tube 5209, and the lower connecting frame 5206 drives the jacking cylinder 5203 on the rotating gear 5205 through the rotating seat 5208. By moving up and down in the inner hole, the roller 513 will change the height along with the jacking cylinder 5203, and the inertial obstruction distance of the jacking head 511 will be adjusted, thereby changing the striking intensity.

S3: When the top table 4 vibrates, the support spring 22 flexibly supports the top table 4 to adapt to the subtle movements of the top table 4. After the test is completed, relax the clamping seat group 36 and rotate the first rotating shaft 311 through the first rotating handle 312. The rotation of the eccentric wheel 313 is controlled by the rotation of the first rotating shaft 311. The centrifugal distal end of the eccentric wheel 313 lifts up the integrated circuit board, and then the integrated circuit board is taken out. The voltage of the integrated circuit board can be detected by a multimeter before and after the test, and the two voltages can be compared. Set the value to determine whether the integrated circuit board is damaged. Of course, other methods can also be used to detect whether the integrated circuit board is damaged.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (9)

1. An integrated circuit board vibration testing device, including a base (1) and a top table (4) located on the upper side of the base (1), characterized in that: the integrated circuit board vibration testing device also includes: The clamping mechanism (3) is located on the upper side of the top table (4) and is used to synchronously hold and clamp multiple integrated circuit boards of the same type; The vibration mechanism (5) is located between the base (1) and the top table (4) and is used to smoothly vibrate the top table (4); The clamping mechanism (3) includes a number of clamping base groups (36) equidistantly arranged inside the upper side of the top table (4). The clamping base group (36) consists of a forward clamping base (361) and a reverse clamping base (362). ) are symmetrically distributed. Both the forward clamp seat (361) and the reverse clamp seat (362) are L-shaped cross-sections. The bottoms of the forward clamp seat (361) and the reverse clamp seat (362) are symmetrically fixed and connected with connecting blocks. (35), the two connecting blocks (35) on the front side of the forward clamp seat (361) and the reverse clamp seat (362) in the same clamp seat group (36) are both slidingly connected to the guide rod (37). The rod (37) is fixedly connected in the top table (4), and the two connecting blocks (35) on the rear side of the forward clamp seat (361) and the reverse clamp seat (362) in the same clamp seat group (36) have symmetrical threads Connected to the two-way screw section (34), each two-way screw section (34) is connected to form a second rotating shaft (33), and the second rotating shaft (33) is rotationally connected in the top table (4), and the top table (4) ) is also provided with a lifting piece (31) for ejecting the integrated circuit board after vibration testing; The vibration mechanism (5) includes a central support tube (5209) fixedly connected to the center of the top of the base (1). The central support tube (5209) is provided with an ejection assembly (51) for ejection of the top table (4). The central support tube (5209) is also provided with a control component (52) for controlling the lifting of the knocking component (51). 2. An integrated circuit board vibration testing device according to claim 1, characterized in that: there are a number of countertop tables (4) equidistantly spaced in the circumferential direction between the base (1) and the top table (4). ) The support member (2) for supporting, the support member (2) includes an upper connecting seat (21) fixedly connected to the bottom of the top platform (4) and a lower connecting seat (23) fixedly connected to the upper side of the base (1), The upper connecting seat (21) and the lower connecting seat (23) are connected through a support spring (22). 3. An integrated circuit board vibration testing device according to claim 1, characterized in that: the lifting member (31) includes a plurality of first rotating shafts (311) rotatably connected inside the lifting table (4), and the An eccentric wheel (313) is fixedly connected to a rotating shaft (311) corresponding to the middle position of the clamping seat group (36). 4. An integrated circuit board vibration testing device according to claim 3, characterized in that: a rotary torsion spring is installed at the connection position between the first rotating shaft (311) and the top table (4). 5. An integrated circuit board vibration testing device according to claim 3, characterized in that: a first rotating handle (312) and a second rotating shaft (33) are fixedly connected to one end of the first rotating shaft (311). A second handle (32) is fixedly connected to one end, and the surfaces of the first handle (312) and the second handle (32) are provided with anti-slip patterns. 6. An integrated circuit board vibration testing device according to claim 1, characterized in that: the knocking assembly (51) includes a connecting ring (519) fixedly connected to the lower side of the central support tube (5209). The ring edge of the ring (519) is fixedly connected to several support block groups (518) at equal distances. The outer ends of the support block groups (518) are fixedly connected to a square frame (517), and the centers of the four sides of the square frame (517) are rotationally connected with rotating sleeves. (516), a connecting arm (515) is fixedly connected to the rotating sleeve (516), one end of the connecting arm (515) away from the rotating sleeve (516) is hinged to the bottom of the ejector rod (514), and the upper end of the ejector rod (514) is fixedly connected There is a knocking head (511). The knocking head (511) is made of rubber. A wheel frame (512) is fixedly connected to the side of the hitting head (511). The four groups of wheel frames (512) are distributed in a cross, and the wheel frame (512) is 512) is internally rotated and connected with a roller (513). 7. An integrated circuit board vibration testing device according to claim 6, characterized in that a downward pressure torsion spring is installed at the connection position between the rotating sleeve (516) and the square frame (517). 8. An integrated circuit board vibration testing device according to claim 1, characterized in that: the control assembly (52) includes an upper connecting frame (5207) fixedly connected to the top of the central support tube (5209), and the upper connecting frame (5207) is fixedly connected to the top of the central support tube (5209). A center gear (5201) is rotatably connected to the center of the frame (5207). The bottom center of the center gear (5201) is fixedly connected to the output end of the drive motor (5210). The drive motor (5210) is fixedly connected to the bottom of the upper connecting frame (5207). , there are four sets of rotating gears (5205) equidistantly meshed around the center gear (5201). Each rotating gear (5205) is distributed correspondingly to the square frame (517), and the rotating gears (5205) are rotatably connected to the upper connection. On the frame (5207), a jacking cylinder (5203) is provided in the center of the rotating gear (5205), and each ejector rod (514) on the same square frame (517) passes through the correspondingly distributed jacking cylinder (5203). , the top edge of the lifting cylinder (5203) rolls in contact with each roller (513) in the same square frame (517), and the top of the lifting cylinder (5203) is provided with a smooth protrusion (5202). The smooth protrusion (5202) Occupies 1/4 of the top edge of the jacked cylinder (5203). 9. An integrated circuit board vibration testing device according to claim 8, characterized in that: the outer wall of the lifting cylinder (5203) is fixedly connected with a number of limiting ridges (5204), and a rotating gear (5205) ) has chute corresponding to each limit protrusion (5204), the limit protrusion (5204) is slidingly connected in the chute, and the bottom of the lifting cylinder (5203) is fixedly connected with a swivel seat (5208), The swivel base (5208) is rotatably connected to the lower connecting frame (5206), the lower connecting frame (5206) is slidingly connected to the central support tube (5209), and the bottom of the lower connecting frame (5206) is fixedly connected to the outputs of several electric push rods (5211). end, the electric push rod (5211) is fixedly connected to the connecting ring (519).