CN112167906A

CN112167906A - Light show cupboard based on internet of things

Info

Publication number: CN112167906A
Application number: CN202011080077.6A
Authority: CN
Inventors: 苗竹
Original assignee: Individual
Current assignee: NINGBO CHANGER ELECTRON CO Ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2021-01-05
Anticipated expiration: 2040-10-10
Also published as: CN112167906B

Abstract

The invention relates to the field of commercial display cabinets, in particular to a light display cabinet based on the technology of the Internet of things, which comprises a cabinet body, a containing structure, a protection structure, a placing structure, an adjusting structure, a clamping structure and a limiting structure, wherein the containing structure is arranged on the cabinet body; through the setting of accomodating the structure, make the cabinet body after laying, can place the computer of stock through accomodating the groove, setting through protective structure, make can play dirt-proof effect to the computer when not needing open show, setting through placing the structure, make can realize the computer with arbitrary angle rotation with the show through spheroidal rotation, setting through adjusting the structure, make it fixes placing the computer on placing the board to be convenient for, setting through clamping structure, make can fix not unidimensional computer, setting through limit structure, make the spheroid can realize fixing or sliding through operating the holding rod.

Description

Light show cupboard based on internet of things

Technical Field

The invention relates to the field of commercial display cabinets, in particular to a light display cabinet based on the technology of the Internet of things.

Background

The show cupboard that the light show cupboard demonstrates is carried out the object in referring to the market, in order to embody the outward appearance of commodity, put the show cupboard in the shop usually, put the commodity that will show again on the show cupboard, shine the best outward appearance of show commodity through light, thereby improve the sale looks of commodity, current light show cupboard is for the theftproof, often all set up the electronic equipment that can the networking in inside, through the effect that internet of things technology cooperation siren made the show cupboard can reach the theftproof, and can send out the police dispatch newspaper and confirm the position through internet of things technology the very first time after taking place to steal.

When present light show cupboard demonstrates to electronic equipment such as computer, panel, it demonstrates to put on the show cupboard through the mode of directly putting or putting through the support usually, inconvenient when consequently showing fixes the computer, makes the computer have because the risk that the careless touching dropped, and when needing to observe the computer of show through different angles, customer then need manually take up the computer and just can realize, consequently the operation is inconvenient.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a light display cabinet based on the technology of the Internet of things.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a light show cupboard based on internet of things, includes the cabinet body, accomodates structure, protective structure, places the structure, adjusts structure, clamping structure and limit structure for show the computer one side of the cabinet body is connected with accomodate the structure, install at the top of the cabinet body and be used for protecting the computer of show protective structure, the top of the cabinet body is connected with and is used for placing the computer place the structure, it is connected with structurally to be used for adjusting according to not unidimensional computer adjust the structure, it is used for carrying out centre gripping and fixed to the computer to adjust structural being connected with be used for the clamping structure it is right to be connected with on the cabinet body place the structure play fixed and limiting displacement limit structure.

Specifically, accomodate the structure including accomodating groove, cabinet door and baffle, seted up one side of the cabinet body accomodate the groove, just seted up of the cabinet body one side of accomodating the groove is rotated and is connected with the cabinet door, accomodate the inside fixedly connected with in groove the baffle.

Specifically, protective structure includes curb plate, metal frame, hinge and fluorescent tube, the top of the cabinet body is equipped with the curb plate with the metal frame, the curb plate with metal frame fixed connection, the side of the cabinet body is connected with the hinge, the hinge with metal frame fixed connection, fixed mounting has on the curb plate the fluorescent tube.

Specifically, place the structure and include spheroid, connecting rod, place board, cushion and rubber pad, install at the top of the cabinet body the spheroid, fixedly connected with on the spheroid the one end of connecting rod, the other end sliding connection of connecting rod has place the board, the one end fixedly connected with of placing the board the cushion, fixedly connected with on the cushion the rubber pad.

Specifically, adjust the structure and include screw rod, dead lever, sliding sleeve, first support, pendulum rod and second support, it is connected with to rotate on the board to place the screw rod, the screw rod with connecting rod threaded connection, the equal fixedly connected with in both ends of connecting rod the dead lever, two equal sliding connection has on the dead lever the sliding sleeve, two equal fixedly connected with on the sliding sleeve the first support, place fixedly connected with on the board the second support, second support and two all be connected with between the first support the pendulum rod.

Specifically, the centre gripping structure includes fixed block, slider, runner, rubber sleeve and spring, two equal fixedly connected with on the slider the fixed block, and two equal sliding connection has on the slider, two fixed block and two fixedly connected with is two between the slider the spring, two all rotate on the slider and be connected with two the runner, four equal fixedly connected with on the runner the rubber sleeve.

Specifically, limit structure includes first slide, second slide, bull stick, holding rod, spacing hole, pressure spring, gag lever post and recess, the inside sliding connection of the cabinet body have first slide with the second slide, first slide with rotate jointly between the second slide and be connected with the bull stick, fixedly connected with on the bull stick the holding rod, seted up one side of the cabinet body spacing hole, the holding rod is located the inside in spacing hole, the cross-section in spacing hole is "L" font, first slide with fixedly connected with between the cabinet body the pressure spring, fixedly connected with on the second slide the gag lever post, seted up on the spheroid the recess, gag lever post sliding connection in the recess.

The invention has the beneficial effects that:

(1) according to the light display cabinet based on the Internet of things technology, the accommodating groove and the partition plate are arranged on one side of the cabinet body, so that stored computers can be placed through the accommodating groove after the cabinet body is placed, and due to the arrangement of the side plates and the metal frame, the computers displayed on the cabinet body can be protected by installing glass or transparent plastic plates on the metal frame, so that the dust-proof effect can be achieved on the computers when the open display is not needed, and the lamp tube can achieve the lighting effect.

(2) According to the light display cabinet based on the Internet of things technology, the sphere is arranged at the top end of the cabinet body in a sliding mode, the placing plate is arranged on the sphere, so that a computer to be displayed can be placed on the placing plate for display, and the sphere can slide at any angle, so that when the displayed computer is observed at different angles in a short distance, the displayed computer can be rotated at any angle through rotation of the sphere; through setting up the screw rod for when the screw rod rotates, can make the screw rod remove for the connecting rod, and then can drive and place the board and remove, place the board and remove the back, because the setting of first support, second support and pendulum rod for it can drive two sliding sleeves and slide on the dead lever to place the board and remove the in-process, thereby is convenient for fix the computer of placing on placing the board.

(3) The light display cabinet based on the technology of the Internet of things is characterized in that the two sliding sleeves are provided with the sliding blocks, and the rotating wheel and the rubber sleeve are arranged on the sliding block, so when the computer is placed on the placing plate and moves along with the placing plate, the four rotating wheels, namely the rubber sleeves can be continuously close to the computer by driving the two sliding sleeves to slide until the rubber sleeves on the four rotating wheels clamp the two sides of the computer, and then when the placing plate is continuously moved by rotating the screw rod, the slide block can not slide continuously because the rotating wheel is already pressed against the side edge of the computer, when the placing plate moves to drive the sliding sleeve to move, the two fixed blocks can extrude the two springs, the two sliding blocks do not move, at the moment, under the pressure of the spring, the rubber sleeves on the four rotating wheels support the side edge of the computer to be tighter, therefore, the computer is firmly fixed on the placing plate, and computers with different sizes can be fixed.

(4) Owing to set up the gag lever post in spheroidal below, and seted up on the spheroid with gag lever post assorted recess, so need the rotary ball body and when observing the computer that demonstrates with different angles, just can the downshifting holding rod, the holding rod downshifting can drive the bull stick downshifting, thereby make first slide and second slide also downshifting, the gag lever post is taken out in the recess on the spheroid this moment, the spheroid can rotate, can make the holding rod be blocked in spacing downthehole through moving the holding rod to the right after moving the below in spacing hole with the holding rod, when not needing the rotary ball body, rotate the spheroid and be close to initial position, reset the holding rod again, then the elasticity of pressure spring can guide the gag lever post to insert the recess, thereby make the spheroid fixed at initial position.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural diagram of an overall structure of a preferred embodiment of a lighting display cabinet based on the internet of things technology provided by the invention;

fig. 2 is a schematic view of a connection structure of the cabinet body and the limiting structure shown in fig. 1;

FIG. 3 is an enlarged view of the part A shown in FIG. 1;

FIG. 4 is an enlarged view of the portion B shown in FIG. 2;

FIG. 5 is a schematic view of a connection structure between the placement board and the clamping structure shown in FIG. 2;

FIG. 6 is a schematic view of a connection structure of the mounting plate and the adjustment structure shown in FIG. 2;

fig. 7 is an exploded view of the connection structure of the ball and the stopper rod shown in fig. 2.

In the figure: 1. the cabinet body, 2, accomodate the structure, 21, accomodate the groove, 22, cabinet door, 23, baffle, 3, protective structure, 31, curb plate, 32, metal frame, 33, hinge, 34, fluorescent tube, 4, place the structure, 41, spheroid, 42, connecting rod, 43, place the board, 44, cushion, 45, rubber pad, 5, regulation structure, 51, screw rod, 52, dead lever, 53, sliding sleeve, 54, first support, 55, pendulum rod, 56, second support, 6, clamping structure, 61, fixed block, 62, slider, 63, runner, 64, rubber sleeve, 65, spring, 7, limit structure, 71, first slide, 72, second slide, 73, bull stick, 74, holding rod, 75, spacing hole, 76, pressure spring, 77, gag lever post, 78, recess.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1-7, the lighting display cabinet based on the internet of things technology comprises a cabinet body 1, a storage structure 2, a protection structure 3, a placement structure 4, an adjustment structure 5, a clamping structure 6 and a limiting structure 7, one side of the cabinet body 1 for displaying the computer is connected with the containing structure 2, the top of the cabinet body 1 is provided with the protection structure 3 for protecting the displayed computer, the top of the cabinet body 1 is connected with the placing structure 4 for placing a computer, the placing structure 4 is connected with the adjusting structure 5 for adjusting according to computers with different sizes, the adjusting structure 5 is connected with the clamping structure 6 for clamping and fixing the computer, the cabinet body 1 is connected with the limiting structure 7 which is used for fixing and limiting the placing structure 4.

Specifically, accomodate structure 2 including accomodating groove 21, cabinet door 22 and baffle 23, the one side of the cabinet body 1 has been seted up accomodate groove 21, just the setup of the cabinet body 1 one side of accomodating groove 21 is rotated and is connected with cabinet door 22, the inside fixedly connected with of accomodating groove 21 baffle 23 owing to be equipped with in one side of the cabinet body 1 and accomodate groove 21 and baffle 23 for the cabinet body 1 is after laying, can place the computer of stock through accomodating groove 21.

Specifically, protective structure 3 includes curb plate 31, metal frame 32, hinge 33 and fluorescent tube 34, the top of the cabinet body 1 is equipped with curb plate 31 with metal frame 32, curb plate 31 with metal frame 32 fixed connection, the side of the cabinet body 1 is connected with hinge 33, hinge 33 with metal frame 32 fixed connection, fixed mounting has on the curb plate 31 fluorescent tube 34 owing to set up curb plate 31 and metal frame 32, can play the effect of protection to the computer that demonstrates on the cabinet body 1 through installation glass or transparent plastic slab on metal frame 32, can play dirt-proof effect to the computer when not needing open show, and fluorescent tube 34 can play the illuminating effect.

Specifically, place structure 4 and include spheroid 41, connecting rod 42, place board 43, cushion 44 and rubber pad 45, install at the top of the cabinet body 1 spheroid 41, fixedly connected with on the spheroid 41 the one end of connecting rod 42, the other end sliding connection of connecting rod 42 place board 43, the one end fixedly connected with of placing board 43 cushion 44, fixedly connected with on the cushion 44 rubber pad 45, owing to set up spheroid 41 in the top of the cabinet body 1 slides, and be provided with on the spheroid 41 and place board 43, consequently the computer that needs the show can be put and do the show on placing board 43, because spheroid 41 can slide with arbitrary angle, consequently when the computer that needs the closely to observe the show with different angles, just can realize the computer that will show with arbitrary angle rotation through spheroid 41's rotation.

Specifically, the adjusting structure 5 includes a screw 51, a fixed rod 52, a sliding sleeve 53, a first bracket 54, a swing rod 55 and a second bracket 56, the screw 51 is rotatably connected to the placing plate 43, the screw 51 is in threaded connection with the connecting rod 42, the fixed rod 52 is fixedly connected to both ends of the connecting rod 42, the sliding sleeves 53 are slidably connected to both the fixed rods 52, the first brackets 54 are fixedly connected to both the sliding sleeves 53, the second bracket 56 is fixedly connected to the placing plate 43, the swing rod 55 is connected between the second bracket 56 and both the first brackets 54, by arranging the screw 51, the screw 51 can be moved relative to the connecting rod 42 when the screw 51 rotates, and further the placing plate 43 can be driven to move, after the placing plate 43 moves, due to the arrangement of the first brackets 54, the second brackets 56 and the swing rod 55, so that the placing plate 43 can drive the two sliding sleeves 53 to slide on the fixing rods 52 during the moving process, thereby facilitating the fixing of the computer placed on the placing plate 43.

Specifically, the clamping structure 6 includes a fixed block 61, a sliding block 62, a rotating wheel 63, a rubber sleeve 64 and springs 65, the fixed block 61 is fixedly connected to each of the two sliding sleeves 53, the sliding block 62 is slidably connected to each of the two sliding sleeves 53, the two springs 65 are fixedly connected between each of the two fixed blocks 61 and each of the two sliding blocks 62, the two rotating wheels 63 are rotatably connected to each of the two sliding blocks 62, the rubber sleeve 64 is fixedly connected to each of the four rotating wheels 63, and the sliding blocks 62 are arranged on each of the two sliding sleeves 53, and the rotating wheel 63 and the rubber sleeve 64 are arranged on each of the sliding blocks 62, so that when the computer is placed on the placing plate 43 and moves along with the placing plate 43, the four rotating wheels 63, i.e., the rubber sleeves 64, can be brought close to the computer by driving the two sliding sleeves 53 to slide until the rubber sleeves 64 on the four rotating wheels, when the placing plate 43 is moved continuously by rotating the screw 51, the sliding blocks 62 cannot slide continuously because the rotating wheels 63 already abut against the side of the computer, and then when the placing plate 43 moves to drive the sliding sleeve 53 to move, the two fixing blocks 61 can extrude the two springs 65, the two sliding blocks 62 do not move, and at this time, under the pressure of the springs 65, the rubber sleeves 64 on the four rotating wheels 63 abut against the side of the computer more tightly, so that the computer is firmly fixed on the placing plate 43, and computers of different sizes can be fixed.

Specifically, the limiting structure 7 includes a first sliding plate 71, a second sliding plate 72, a rotating rod 73, a holding rod 74, a limiting hole 75, a pressure spring 76, a limiting rod 77 and a groove 78, the first sliding plate 71 and the second sliding plate 72 are slidably connected to the inside of the cabinet body 1, the rotating rod 73 is rotatably connected between the first sliding plate 71 and the second sliding plate 72, the holding rod 74 is fixedly connected to the rotating rod 73, the limiting hole 75 is formed in one side of the cabinet body 1, the holding rod 74 is located inside the limiting hole 75, the cross section of the limiting hole 75 is "L" -shaped, the pressure spring 76 is fixedly connected between the first sliding plate 71 and the cabinet body 1, the limiting rod 77 is fixedly connected to the second sliding plate 72, the groove 78 is formed in the ball 41, the limiting rod 77 is slidably connected to the groove 78, and the limiting rod 77 is disposed below the ball 41, and the sphere 41 is provided with a groove 78 matched with the limit rod 77, so that when the sphere 41 needs to be rotated and the computer displayed is observed at different angles, the holding rod 74 can be moved downwards, the holding rod 74 moves downwards to drive the rotating rod 73 to move downwards, so that the first sliding plate 71 and the second sliding plate 72 also move downwards, at this time, the limit rod 77 is drawn out from the groove 78 on the sphere 41, the sphere 41 can rotate, the holding rod 74 can be moved to the lower part of the limit hole 75, the holding rod 74 can be clamped in the limit hole 75 by moving the holding rod 74 to the right, when the sphere 41 does not need to be rotated, the sphere 41 is rotated to be close to the initial position, and then the holding rod 74 is reset, and the elastic force of the pressure spring 76 can guide the limit rod 77 to be inserted into the groove 78, so that the sphere 41 is fixed at the initial position.

When the invention is used, firstly, because the accommodating groove 21 and the partition plate 23 are arranged on one side of the cabinet body 1, the stored computer can be placed through the accommodating groove 21 after the cabinet body 1 is placed, and because the side plate 31 and the metal frame 32 are arranged, the computer displayed on the cabinet body 1 can be protected by installing glass or a transparent plastic plate on the metal frame 32, the dustproof effect can be achieved on the computer when the public display is not needed, and the lamp tube 34 can achieve the lighting effect; because the sphere 41 is arranged at the top end of the cabinet body 1 in a sliding manner, and the placing plate 43 is arranged on the sphere 41, a computer to be displayed can be placed on the placing plate 43 for display, and because the sphere 41 can slide at any angle, when the displayed computer is observed at different angles in a short distance, the displayed computer can be rotated at any angle through the rotation of the sphere 41; through the arrangement of the screw rod 51, when the screw rod 51 rotates, the screw rod 51 can move relative to the connecting rod 42, and further the placing plate 43 can be driven to move, and after the placing plate 43 moves, due to the arrangement of the first bracket 54, the second bracket 56 and the swing rod 55, the two sliding sleeves 53 can be driven to slide on the fixing rod 52 in the moving process of the placing plate 43, so that the computer placed on the placing plate 43 can be conveniently fixed; since the sliding blocks 62 are provided on both sliding sleeves 53, and the rotating wheels 63 and the rubber sleeves 64 are provided on the sliding blocks 62, when the computer is placed on the placing plate 43 and moves along with the placing plate 43, the four rotating wheels 63, namely the rubber sleeves 64 can be moved closer to the computer by driving the two sliding sleeves 53 to slide until the rubber sleeves 64 on the four rotating wheels 63 clamp the two sides of the computer, and then when the placing board 43 is moved further by rotating the screw 51, the sliding block 62 can not slide further because the rotating wheels 63 already abut against the side of the computer, when the placing plate 43 moves to drive the sliding sleeve 53 to move, the two fixing blocks 61 can be pressed against the two springs 65, the two sliding blocks 62 do not move, and at this time, under the pressure of the spring 65, the rubber sleeves 64 on the four rotating wheels 63 push the side edges of the computer to be tighter, thereby firmly fixing the computer on the placing plate 43 and fixing computers with different sizes; because the limiting rod 77 is arranged below the sphere 41, and the sphere 41 is provided with the groove 78 matched with the limiting rod 77, when the sphere 41 needs to be rotated to observe a computer displayed at different angles, the holding rod 74 can be moved downwards, the holding rod 74 can drive the rotating rod 73 to move downwards, so that the first sliding plate 71 and the second sliding plate 72 also move downwards, at the moment, the limiting rod 77 is drawn out from the groove 78 on the sphere 41, the sphere 41 can rotate, the holding rod 74 can be moved to the lower part of the limiting hole 75, then the holding rod 74 can be clamped in the limiting hole 75 by moving the holding rod 74 to the right, when the sphere 41 does not need to be rotated, the sphere 41 is rotated to be close to an initial position, then the holding rod 74 is reset, and the elastic force of the pressure spring 76 can guide the limiting rod 77 to be inserted into the groove 78, so that the sphere 41 is fixed at the initial position.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a light show cupboard based on internet of things, its characterized in that: comprises a cabinet body (1), a containing structure (2), a protective structure (3), a placing structure (4), an adjusting structure (5), a clamping structure (6) and a limiting structure (7), one side of the cabinet body (1) for displaying a computer is connected with the containing structure (2), the top of the cabinet body (1) is provided with the protective structure (3) for protecting the displayed computer, the top of the cabinet body (1) is connected with the placing structure (4) for placing a computer, the placing structure (4) is connected with an adjusting structure (5) used for adjusting according to computers with different sizes, the adjusting structure (5) is connected with a clamping structure (6) used for clamping and fixing a computer, the cabinet body (1) is connected with a limiting structure (7) which is used for fixing and limiting the placing structure (4).

2. A light display cabinet based on the technology of the Internet of things according to claim 1, characterized in that: accomodate structure (2) including accomodating groove (21), cabinet door (22) and baffle (23), seted up one side of the cabinet body (1) accomodate groove (21), just seted up of the cabinet body (1) one side of accomodating groove (21) is rotated and is connected with cabinet door (22), the inside fixedly connected with of accomodating groove (21) baffle (23).

3. A light display cabinet based on the technology of the Internet of things according to claim 1, characterized in that: protective structure (3) include curb plate (31), metal frame (32), hinge (33) and fluorescent tube (34), the top of the cabinet body (1) is equipped with curb plate (31) with metal frame (32), curb plate (31) with metal frame (32) fixed connection, the side of the cabinet body (1) is connected with hinge (33), hinge (33) with metal frame (32) fixed connection, fixed mounting is gone up in curb plate (31) fluorescent tube (34).

4. A light display cabinet based on the technology of the Internet of things according to claim 1, characterized in that: place structure (4) including spheroid (41), connecting rod (42), place board (43), cushion (44) and rubber pad (45), install at the top of the cabinet body (1) spheroid (41), fixedly connected with on spheroid (41) the one end of connecting rod (42), the other end sliding connection of connecting rod (42) has place board (43), the one end fixedly connected with of placing board (43) cushion (44), fixedly connected with on cushion (44) rubber pad (45).

5. A light display cabinet based on the technology of the Internet of things according to claim 4, characterized in that: the adjusting structure (5) comprises a screw rod (51), a fixing rod (52), a sliding sleeve (53), a first support (54), a swing rod (55) and a second support (56), the placing plate (43) is connected with the screw rod (51) in a rotating mode, the screw rod (51) is in threaded connection with the connecting rod (42), the fixing rod (52) is fixedly connected to the two ends of the connecting rod (42), the sliding sleeve (53) is slidably connected to the two fixing rods (52), the first support (54) is fixedly connected to the two sliding sleeve (53), the second support (56) is fixedly connected to the placing plate (43), and the swing rod (55) is connected between the second support (56) and the two first supports (54).

6. A light display cabinet based on the technology of the Internet of things according to claim 5, characterized in that: centre gripping structure (6) are including fixed block (61), slider (62), runner (63), rubber sleeve (64) and spring (65), two equal fixedly connected with is gone up in sliding sleeve (53) fixed block (61), and two equal sliding connection is gone up in sliding sleeve (53) slider (62), two fixed block (61) and two fixedly connected with is two between slider (62) spring (65), two all rotate on slider (62) and be connected with two runner (63), four equal fixedly connected with is gone up in runner (63) rubber sleeve (64).

7. A light display cabinet based on the technology of the Internet of things according to claim 4, characterized in that: the limiting structure (7) comprises a first sliding plate (71), a second sliding plate (72), a rotating rod (73), a holding rod (74), a limiting hole (75), a pressure spring (76), a limiting rod (77) and a groove (78), the first sliding plate (71) and the second sliding plate (72) are connected to the inside of the cabinet body (1) in a sliding mode, the rotating rod (73) is connected between the first sliding plate (71) and the second sliding plate (72) in a rotating mode, the holding rod (74) is fixedly connected to the rotating rod (73), the limiting hole (75) is formed in one side of the cabinet body (1), the holding rod (74) is located inside the limiting hole (75), the cross section of the limiting hole (75) is L-shaped, the pressure spring (76) is fixedly connected between the first sliding plate (71) and the cabinet body (1), the limiting rod (77) is fixedly connected to the second sliding plate (72), the ball body (41) is provided with the groove (78), and the limiting rod (77) is connected to the groove (78) in a sliding mode.