CN219493742U - Multimedia information display device with self-protection function - Google Patents

Abstract

The utility model relates to a multimedia information display device with a self-protection function, which comprises a protection box, wherein a motor box is fixedly connected to the right side of the protection box, a driving motor is fixedly connected to the inner side of the motor box, a bidirectional screw is fixedly connected to an output shaft of the driving motor, two movable screw blocks are connected to the outer side of the bidirectional screw in a threaded manner, first regulating blocks are fixedly connected to the tops of the two movable screw blocks, regulating rods are movably connected to the tops of the two first regulating blocks, second regulating blocks are movably connected to the tops of the two regulating rods, a supporting table is fixedly connected to the top of the second regulating blocks, and a multimedia information display machine is movably connected to the top of the supporting table. The multimedia information display device with the self-protection function has the advantages of simple overall structure and convenient use, achieves the purpose of self-protection of the multimedia information display device, and improves the use efficiency and the use effect of the multimedia information display device.

Description

Multimedia information display device with self-protection function

Technical Field

The utility model relates to the technical field of multimedia information display equipment, in particular to multimedia information display equipment with a self-protection function.

Background

The multimedia information display equipment is one of the highest standards developed by the short message technology, and has the biggest characteristic of supporting multimedia functions and transmitting video clips, pictures, sounds and words by using WAP as a carrier by means of high-speed transmission technologies EDGE and GPRS.

The multimedia information display device not only can carry out multimedia transmission between the mobile phones, but also can transmit between the mobile phones and computers, for example, the multimedia information display device convenient to disassemble and assemble is provided with the advantages of being formed by splicing a plurality of parts, the occupied area of the display device is reduced, parts are connected through screws or bolts, the structure is simple, special tools are not needed, the installation and disassembly are convenient, the left bottom plate and the rear bottom plate are connected through the cooperation of the hooks and the clamping blocks, the occupied area of the bottom plate is reduced, the transportation and the carrying are convenient, the left bottom plate and the rear bottom plate are ensured to be connected and cannot displace, the stability of the display device is improved, the support force is further provided for the display screen through the design of the springs, but the design does not have the protection advantage, the multimedia information display device is easy to damage due to the impact of external force in the moving or storing process, the service life of the multimedia information display device is reduced, the multimedia information display device cannot be used in a plurality of ranges, the service is inconvenient, the service requirements of people are not met, and the service efficiency of the multimedia information display device is reduced.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides the multimedia information display equipment with the self-protection function, which has the advantages of self protection and the like, and solves the problems that the prior multimedia information display equipment does not have the self-protection, so that the multimedia information display equipment is easy to be damaged due to the impact of external force when people do not use the multimedia information display equipment, the service life of the multimedia information display equipment is reduced, the use is inconvenient, and the use efficiency and the use effect of the multimedia information display equipment are reduced.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a multimedia information display device with self preservation protects function, includes the protective housing, the right side fixedly connected with motor case of protective housing, the inboard fixedly connected with driving motor of motor case, driving motor's output shaft fixedly connected with bi-directional screw, the outside threaded connection of bi-directional screw has two movable screw blocks, two the equal fixedly connected with in top of movable screw block is first regulating block, two the equal swing joint in top of first regulating block has the regulation pole, two the equal swing joint in top of regulation pole has the second regulating block, the top fixedly connected with brace table of second regulating block, the top swing joint of brace table has multimedia information display machine, the equal fixedly connected with in left and right sides at brace table top two mounts, two the equal threaded connection in inboard of mount has the threaded rod, two the equal fixedly connected with movable clamp splice in bottom of threaded rod, two the equal fixedly connected with movable rotating handle in top of threaded rod.

Further, the left side and the right side of the supporting table are fixedly connected with moving blocks, the left side wall and the right side wall of the protective box are provided with moving long grooves, and the two moving blocks are respectively connected with the two moving long grooves in a sliding mode.

Further, the left end fixedly connected with turning block of two-way screw rod, turning block rotates with the protective housing to be connected, the left end of two-way screw rod runs through motor case, protective housing and movable screw piece in proper order and extends to the right side of turning block.

Further, the bottoms of the two movable screw blocks are fixedly connected with limiting blocks, limiting long grooves are formed in the inner bottom wall of the protective box, the number of the limiting long grooves is two, the two limiting blocks are respectively and slidably connected with the two limiting long grooves, and the width of each limiting block is equal to that of each limiting long groove.

Further, four corners of the bottom of the protection box are fixedly connected with moving wheels, the outer sides of the four moving wheels are fixedly connected with brakes, and anti-skid grooves are formed in the outer sides of the four moving wheels.

Further, the top swing joint of protective housing has the shield, the fixed grab handle of bottom fixedly connected with of shield, the shield passes through hinge and protective housing swing joint.

Further, two mounting grooves are formed in the top of the multimedia information display machine, and the two movable clamping blocks are respectively clamped with the two mounting grooves.

Further, the left side fixedly connected with dead lever of protective housing, the inboard swing joint of dead lever has the movable rod, the outside fixedly connected with of movable rod pushes away the handle, the inboard threaded connection of dead lever has the hob, the outside fixedly connected with locating piece of hob, the outside fixedly connected with activity commentaries on classics piece of hob.

Further, the outside of movable rod has seted up the constant head tank, and the quantity of constant head tank is seven, and seven constant head tanks are the equidistance and arrange, locating piece and constant head tank joint, the screw thread through-hole with screw rod outside screw thread looks adaptation has been seted up to the inboard of dead lever.

Further, the outside fixedly connected with spacing button block of dead lever, the outside fixedly connected with slipmat of fixed pushing away the handle, the fixed through-hole that equals with the movable rod diameter has been seted up on the top of dead lever, and fixed through-hole and movable rod sliding connection, the diameter of spacing button block is greater than the diameter of fixed through-hole.

Compared with the prior art, the technical scheme of the application has the following beneficial effects:

1. this multimedia information display device with self preservation protects function, when not needing to use the multimedia information display machine, can drive bi-directional screw through driving motor and rotate, because two movable spiral shell pieces all with bi-directional screw threaded connection, two first regulating blocks all pass through movable pin and two regulation pole swing joint, two second regulating blocks all pass through connecting pin and two regulation pole swing joint, so the in-process of bi-directional screw pivoted, through the cooperation effect between two movable spiral shell pieces, two first regulating blocks, two regulation pole and two second regulating blocks, can drive brace table and multimedia information display machine in proper order and move down, can remove the inboard of protective housing with the multimedia information display machine, and finally cover the protective cover, thereby can protect the multimedia information display machine, avoid the multimedia information display machine to receive the damage as far as possible, and a whole simple structure facilitates the use, the purpose that the multimedia information display device self preservation protects has been realized, the multimedia information display device receives the impact of external force and damages, the multimedia information display device's life and service life has been improved.

2. This multimedia information display equipment with self preservation protects function, when need dismantle the detection to the multimedia information display machine, shift out the multimedia information display machine from the inboard of protective housing earlier, then can drive two threaded rods rotation respectively through rotating two movable handles, because two mounts respectively with two threaded rod threaded connection, so two threaded rod pivoted in-process can drive the rotatory going on of two movable clamp splice respectively and upwards remove, make two movable clamp splice and multimedia information display machine separation, make the multimedia information display machine lose spacingly, thereby can dismantle the multimedia information display machine from the top of brace table, so that carry out periodic dismantlement detection to the multimedia information display machine.

3. This multimedia information display device with self preservation protects function, through four removal wheels and fixed pushing handle, can remove protective housing and multimedia information display machine, can remove the appointed place with multimedia information display machine and use, when need highly adjusting to the multimedia information display machine, can drive hob and locating piece in proper order through clockwise rotation movable rotating block and clockwise rotation, because dead lever and hob threaded connection, the pivoted in-process of hob can drive the rotatory going on of locating piece and reciprocate, make locating piece and the constant head tank separation of current joint, make the movable lever lose spacingly, can adjust the height of fixed pushing handle through pulling movable lever this moment, after the fixed pushing handle is adjusted to required height, anticlockwise rotation movable rotating block again can drive hob and locating piece anticlockwise rotation in proper order, can remove the locating piece to the constant head tank of current joint, can carry out spacing again to the movable lever, can fix fixed pushing handle at appointed height, thereby can let different staff promote the fixed handle and remove the fixed media information display machine of protective housing, the effect of multimedia information display is guaranteed to the mobile.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is an external view of a connection structure of a protective box in the structure of the present utility model;

FIG. 3 is a right side view of the connection structure of the protection box in the structure of the present utility model;

FIG. 4 is a left side view of the connection structure of the protection box in the structure of the utility model;

FIG. 5 is a front view of the connection structure of the protection box in the structure of the present utility model;

FIG. 6 is a top view of a protective housing connection structure in accordance with the present utility model;

FIG. 7 is an enlarged view of the structure of the present utility model at A in FIG. 1;

fig. 8 is an enlarged view of B in fig. 1, which is a structural view of the present utility model.

In the figure: 1. a protective box; 2. a motor case; 3. a driving motor; 4. a bidirectional screw; 5. a movable screw block; 6. a first adjustment block; 7. an adjusting rod; 8. a second adjustment block; 9. a support table; 10. a multimedia information display; 11. a fixing frame; 12. a threaded rod; 13. a movable clamping block; 14. a movable rotating handle; 15. a moving block; 16. a rotating block; 17. a limiting block; 18. a moving wheel; 19. a brake; 20. a protective cover; 21. a fixed rod; 22. a movable rod; 23. fixing a push handle; 24. a screw rod; 25. a positioning block; 26. a movable rotating block.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-8, a multimedia information display device with self-protection function in this embodiment includes a protection box 1, a motor box 2 is fixedly connected to the right side of the protection box 1, a driving motor 3 is fixedly connected to the inner side of the motor box 2, a bidirectional screw 4 is fixedly connected to an output shaft of the driving motor 3, two movable screw blocks 5 are connected to the outer side of the bidirectional screw 4 in a threaded manner, first adjusting blocks 6 are fixedly connected to the tops of the two movable screw blocks 5, adjusting rods 7 are movably connected to the tops of the two first adjusting blocks 6, second adjusting blocks 8 are movably connected to the tops of the two adjusting rods 7, a supporting table 9 is fixedly connected to the top of the second adjusting block 8, and a multimedia information display 10 is movably connected to the top of the supporting table 9.

The left and right sides at supporting bench 9 top all fixedly connected with two mounts 11, the inboard equal threaded connection of two mounts 11 has threaded rod 12, the equal fixedly connected with activity clamp splice 13 in bottom of two threaded rods 12, the equal fixedly connected with activity stem 14 in top of two threaded rods 12, two activity clamp splice 13 all with multimedia information display 10 swing joint.

The left and right sides of brace table 9 all fixedly connected with movable block 15, the removal elongated slot has all been seted up to the left and right sides wall of protective housing 1, two movable blocks 15 respectively with two removal elongated slots sliding connection, two movable blocks 15 and removal elongated slot are the T style of calligraphy, the left end fixedly connected with turning block 16 of two-way screw 4, turning block 16 and protective housing 1 rotate to be connected, the left end of two-way screw 4 runs through motor case 2, protective housing 1 and movable screw 5 in proper order and extends to the right side of turning block 16.

The bottom of two movable screw blocks 5 is all fixedly connected with stopper 17, spacing elongated slot has been seted up to the interior bottom wall of protective housing 1, and the quantity of spacing elongated slot is two, two stopper 17 respectively with two spacing elongated slot sliding connection, the width of stopper 17 equals with the width of spacing elongated slot, the equal fixedly connected with in four corners of protective housing 1 bottom removes wheel 18, the equal fixedly connected with brake 19 in the outside of four removal wheels 18, the antiskid groove has all been seted up in the outside of four removal wheels 18, the top swing joint of protective housing 1 has shield 20, the fixed grab handle of bottom fixedly connected with of shield 20, shield 20 passes through hinge and protective housing 1 swing joint.

Two mounting grooves are formed in the top of the multimedia information display machine 10, two movable clamping blocks 13 are respectively connected with the two mounting grooves in a clamping mode, two first adjusting blocks 6 are movably connected with two adjusting rods 7 through movable pins, two second adjusting blocks 8 are movably connected with the two adjusting rods 7 through connecting pins, threaded holes matched with threads on the outer sides of two bidirectional screws 4 are formed in the inner sides of two movable screw blocks 5, and the directions of the threads on the inner sides of the two threaded holes are opposite.

The two fixing frames 11 are L-shaped, screw holes matched with the outer threads of the threaded rods 12 are formed in the inner sides of the two fixing frames 11, the bottom ends of the threaded rods 12 penetrate through the fixing frames 11 and extend to the tops of the movable clamping blocks 13, fixed square holes are formed in the tops of the protective boxes 1, the length of each fixed square hole is larger than that of the supporting table 9, and the width of each fixed square hole is larger than that of the supporting table 9.

The left side fixedly connected with dead lever 21 of protective housing 1, the inboard swing joint of dead lever 21 has movable rod 22, the outside fixedly connected with of movable rod 22 pushes away handle 23, the inboard threaded connection of dead lever 21 has screw rod 24, the outside fixedly connected with locating piece 25 of screw rod 24, the outside fixedly connected with movable turning piece 26 of screw rod 24, the constant head tank has been seted up in the outside of movable rod 22, and the quantity of constant head tank is seven, seven constant head tanks are the equidistance and arrange, locating piece 25 and constant head tank joint, the screw thread through-hole with screw thread looks adaptation of screw rod 24 is seted up to the inboard of dead lever 21, the outside fixedly connected with spacing circle piece of dead lever 21, the outside fixedly connected with slipmat of fixed push handle 23, the fixed through-hole equal with the diameter of movable rod 22 is seted up on the top of dead lever 21, and fixed through-hole and movable rod 22 sliding connection, the diameter of spacing circle piece is greater than the diameter of fixed through-hole, the spacing circle piece is located the inboard of dead lever 21.

In addition, through setting up protective housing 1 and shield cap 20, can protect multimedia information display 10, avoid multimedia information display 10 to damage because of the impact of external force, through setting up fixed grab handle, can open and close shield cap 20, through setting up motor case 2, can protect driving motor 3, avoid driving motor 3 to damage because of the impact of external force, through setting up rotary block 16, can improve bi-directional screw 4 pivoted stability, through setting up two stopper 17 and two spacing elongated slots, can spacing two movable screw 5 carry out circumference rotation, can improve the stability about two movable screw 5 simultaneously.

Through setting up the movable pin, can make the first regulating block 6 and adjust the pole 7 between have the effect of angle wobbling, through setting up the connecting pin, can make adjust the pole 7 and adjust the pole 8 between have the effect of angle wobbling, through setting up brace table 9, can support multimedia information display 10, through setting up two movable blocks 15 and two movable elongated slots, can improve the stability that brace table 9 reciprocated, avoid brace table 9 to rock about the in-process of removal at will.

Through setting up two activity clamp splice 13 and two mounting grooves, can guarantee the stability that multimedia information display 10 and brace table 9 are connected, through setting up four removal wheels 18 and fixed push handle 23, can remove protective housing 1, through setting up brake 19, can fix removal wheel 18, avoid multimedia information display 10 at the phenomenon that removes wheel 18 emergence in the in-process of using, through setting up the antiskid groove, can make removal wheel 18 have skid-proof effect.

Through setting up dead lever 21 and movable rod 22, can support fixed push handle 23, through setting up the slipmat, can make fixed push handle 23 have skid-proof effect, through setting up spacing circle piece, can carry out spacingly to movable rod 22, avoid movable rod 22 to shift out from the inboard of dead lever 21 completely, through setting up locating piece 25 and constant head tank, can carry out spacing fixedly to movable rod 22, through setting up fixed through-hole, can guarantee the gliding effect of movable rod 22.

The working principle of the embodiment is as follows:

(1) When the multimedia information display 10 is not needed, the driving motor 3 can drive the bidirectional screw 4 to rotate, because the two movable screw blocks 5 are in threaded connection with the bidirectional screw 4, the two first adjusting blocks 6 are movably connected with the two adjusting rods 7 through movable pins, and the two second adjusting blocks 8 are movably connected with the two adjusting rods 7 through connecting pins, in the process of rotating the bidirectional screw 4, the supporting table 9 and the multimedia information display 10 can be sequentially driven to move downwards through the cooperation among the two movable screw blocks 5, the two first adjusting blocks 6, the two adjusting rods 7 and the two second adjusting blocks 8, the multimedia information display 10 can be moved to the inner side of the protective box 1, and finally the protective cover 20 is covered, so that the multimedia information display 10 can be protected, and the multimedia information display 10 is prevented from being damaged as much as possible.

(2) When the multimedia information display 10 is needed, the protective cover 20 is opened firstly by the opposite principle, and then the multimedia information display 10 can be moved out from the inner side of the protective box 1 through the cooperation among the driving motor 3, the bidirectional screw 4, the movable screw 5, the first adjusting block 6, the adjusting rod 7, the second adjusting block 8 and the supporting table 9, so that the multimedia information display 10 can be conveniently used.

(3) Through the cooperation between the two fixing frames 11, the two threaded rods 12, the two movable clamping blocks 13 and the two movable rotating handles 14, the supporting table 9 and the multimedia information display 10 can be stably connected together, and the phenomenon that the multimedia information display 10 falls off or deviates in the moving or using process is avoided.

(4) When the multimedia information display 10 needs to be disassembled and detected, the multimedia information display 10 is firstly moved out of the inner side of the protective box 1, then the two movable handles 14 are rotated to respectively drive the two threaded rods 12 to rotate, and the two fixing frames 11 are respectively in threaded connection with the two threaded rods 12, so that the two movable clamping blocks 13 are respectively driven to rotate to move upwards in the rotating process of the two threaded rods 12, the two movable clamping blocks 13 are separated from the multimedia information display 10, the multimedia information display 10 is not limited, and the multimedia information display 10 can be disassembled from the upper side of the supporting table 9, so that the multimedia information display 10 can be conveniently disassembled and detected regularly.

(5) The protective case 1 and the multimedia information display 10 can be moved by the four moving wheels 18 and the fixed push handle 23, and the multimedia information display 10 can be moved to a designated place for use.

(6) When the height of the multimedia information display 10 needs to be adjusted, the movable rotating block 26 can sequentially drive the spiral rod 24 and the positioning block 25 to rotate clockwise, and because the fixed rod 21 is in threaded connection with the spiral rod 24, the spiral rod 24 can drive the positioning block 25 to rotate to move up and down in the process of rotating, so that the positioning block 25 is separated from a positioning groove of the current clamping connection, the movable rod 22 is out of limit, the height of the fixed push handle 23 can be adjusted by pulling the movable rod 22, after the fixed push handle 23 is adjusted to the required height, the movable rotating block 26 can sequentially drive the spiral rod 24 and the positioning block 25 to rotate anticlockwise, the positioning block 25 can be moved into the positioning groove of the current clamping connection, the movable rod 22 can be limited again, the fixed push handle 23 can be fixed at the designated height, and workers with different heights can push the fixed push handle 23 to move the mobile protective box 1 and the multimedia information display 10, and the moving effect of the multimedia information display 10 is ensured.

Compared with the prior art, the self-protection device has the advantages that the self-protection device is simple in integral structure and convenient to use, the self-protection purpose of the multimedia information display device is achieved, the multimedia information display device is prevented from being damaged due to the impact of external force when people do not use the multimedia information display device, the service life of the multimedia information display device is prolonged, and the use efficiency and the use effect of the multimedia information display device are improved.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A multimedia information display device having a self-protection function, characterized in that: the intelligent protection device comprises a protection box (1), a motor box (2) is fixedly connected to the right side of the protection box (1), a driving motor (3) is fixedly connected to the inner side of the motor box (2), a bidirectional screw (4) is fixedly connected to an output shaft of the driving motor (3), two movable screw blocks (5) are connected to the outer side of the bidirectional screw (4) in a threaded mode, first regulating blocks (6) are fixedly connected to the tops of the two movable screw blocks (5), regulating rods (7) are movably connected to the tops of the two first regulating blocks (6), second regulating blocks (8) are movably connected to the tops of the two regulating rods (7), a supporting table (9) is fixedly connected to the tops of the second regulating blocks (8), and a multimedia information display machine (10) is movably connected to the tops of the supporting table (9);

the support table is characterized in that two fixing frames (11) are fixedly connected to the left side and the right side of the top of the support table (9), threaded rods (12) are connected to the inner sides of the fixing frames (11) in a threaded mode, movable clamping blocks (13) are fixedly connected to the bottom ends of the threaded rods (12), and movable rotating handles (14) are fixedly connected to the top ends of the threaded rods (12).

2. A multimedia information display apparatus having a self-protection function according to claim 1, wherein: the left side and the right side of the supporting table (9) are fixedly connected with moving blocks (15), the left side wall and the right side wall of the protective box (1) are provided with moving long grooves, and the two moving blocks (15) are respectively connected with the two moving long grooves in a sliding mode.

3. A multimedia information display apparatus having a self-protection function according to claim 1, wherein: the left end fixedly connected with turning block (16) of bi-directional screw rod (4), turning block (16) rotate with protective housing (1) to be connected, the left end of bi-directional screw rod (4) runs through motor case (2), protective housing (1) and movable screw block (5) in proper order and extends to the right side of turning block (16).

4. A multimedia information display apparatus having a self-protection function according to claim 1, wherein: limiting blocks (17) are fixedly connected to the bottoms of the two movable screw blocks (5), limiting long grooves are formed in the inner bottom wall of the protective box (1), the number of the limiting long grooves is two, the two limiting blocks (17) are respectively and slidably connected with the two limiting long grooves, and the width of each limiting block (17) is equal to that of each limiting long groove.

5. A multimedia information display apparatus having a self-protection function according to claim 1, wherein: four corners of protective housing (1) bottom all fixedly connected with removes wheel (18), four the outside of removing wheel (18) all fixedly connected with stopper (19), four the antiskid groove has all been seted up in the outside of removing wheel (18).

6. A multimedia information display apparatus having a self-protection function according to claim 1, wherein: the top swing joint of protective housing (1) has shield lid (20), the bottom fixedly connected with of shield lid (20) is fixed to be grabbed the handle, shield lid (20) are through hinge and protective housing (1) swing joint.

7. A multimedia information display apparatus having a self-protection function according to claim 1, wherein: two mounting grooves are formed in the top of the multimedia information display machine (10), and the two movable clamping blocks (13) are respectively clamped with the two mounting grooves.

8. A multimedia information display apparatus having a self-protection function according to claim 1, wherein: the left side fixedly connected with dead lever (21) of protective housing (1), the inboard swing joint of dead lever (21) has movable rod (22), the outside fixedly connected with of movable rod (22) pushes away handle (23), the inboard threaded connection of dead lever (21) has hob (24), the outside fixedly connected with locating piece (25) of hob (24), the outside fixedly connected with movable turning block (26) of hob (24).

9. The multimedia information display apparatus with self-protection function according to claim 8, wherein: positioning grooves are formed in the outer side of the movable rod (22), seven positioning grooves are arranged at equal intervals, the positioning blocks (25) are connected with the positioning grooves in a clamping mode, and threaded through holes matched with threads on the outer side of the screw rod (24) are formed in the inner side of the fixed rod (21).

10. The multimedia information display apparatus with self-protection function according to claim 8, wherein: the fixed rod is characterized in that a limiting round block is fixedly connected to the outer side of the fixed rod (21), an anti-slip pad is fixedly connected to the outer side of the fixed push handle (23), a fixed through hole with the same diameter as the movable rod (22) is formed in the top end of the fixed rod (21), the fixed through hole is in sliding connection with the movable rod (22), and the diameter of the limiting round block is larger than that of the fixed through hole.