Underground AC charging pile power supply intelligent controller

Abstract

The invention discloses an underground alternating current charging pile power supply intelligent controller, and relates to the technical field of power supply intelligent control, the underground alternating current charging pile power supply intelligent controller comprises a box body and a protection shell, the inner side surface of the box body is fixedly provided with an intelligent integrated board, and a protection mechanism is arranged between the intelligent integrated board and the intelligent controller; a control switch is fixedly installed on the inner side face of the box body, a dust removal box is fixedly installed on the bottom face of the protection shell, and a dust removal mechanism is arranged between the dust removal box and the control switch. A heat dissipation box is fixedly installed on the inner side face of the box body, a heat dissipation disc is fixedly installed on the inner side face of the protection shell, and a heat dissipation mechanism is arranged between the heat dissipation disc and the heat dissipation box. According to the underground alternating current charging pile power supply intelligent controller, the protection shell is fixed in the box body through the screws, so that the intelligent controller is fixed, the intelligent controller is protected from being collided and damaged, the purpose of improving the equipment safety is achieved, the screws are detached through a tool, and personnel can conveniently maintain internal equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply intelligent control, and in particular to an underground AC charging pile power supply intelligent controller. Background Art

[0002] A charging pile is a device that provides charging services for electric vehicles and hybrid vehicles. With the rapid development of the new energy vehicle market, charging piles have also been rapidly popularized. The power intelligent control can control computers and central control devices by sending information, and achieve electrical connection by fixing the connecting wires in the internal socket of the power controller, making it easier for the power intelligent controller to control the charging of the charging pile.

[0003] However, when the existing power intelligent controller is in use, dust floating in the air enters the power intelligent controller, causing the connection port of the power intelligent controller to be covered with dust, resulting in damage to the power intelligent controller due to dust during use.

[0004] In order to solve the above-mentioned defects, in the prior art, a Chinese patent with publication number CN220873921U discloses a power supply for an intelligent controller. By setting a protective device, a protective effect is achieved when the power supply body is stored, and it is prevented that when the staff stores the power supply body, due to the long storage time, the dust floating in the air enters the connection port of the power supply body, resulting in the connection port of the power supply body being covered with dust, causing the power supply body to be damaged due to dust when in use, thereby improving the safety of the device. By setting a disassembly device, the sliding plate can be quickly disassembled from the sliding groove of the power supply body, thereby achieving the effect of facilitating the staff to inspect the inside of the power supply body, and avoiding the situation that when the staff needs to inspect the inside of the power supply body, the connection between the power supply body and the connecting plate is too firm, resulting in the staff having difficulty in separating the connecting plate from the power supply body without suitable tools, causing the staff to be inconvenient to inspect the inside of the power supply body, thereby improving the practicality of the device.

[0005] In the prior art, a Chinese patent with publication number CN218998586U discloses a remote intelligent power controller, including a main body, a first assembly board is arranged at one end of the main body, a second assembly board is arranged at the other end of the main body, a first placement slot is arranged in the main body, a circuit board is arranged in the main body, a placement slot is opened between the inner wall and the outer side of the main body, a placement board is arranged in the placement slot, a magnetic plate is arranged at one end of the placement board, a strong fixture is arranged on the outer side of the main body, a mounting slot is arranged on the outer side of the main body, a mounting piece is arranged on the strong fixture, and a remote control integrated module is arranged on the circuit board. By setting the placement slot and the placement slot, the remote control integrated module can be controlled by the remote control integrated module. Plate and magnetic plate. After the controller is connected to the corresponding circuit, when the controller body needs to be fixed, the installation plate can be pulled outward, and the magnetic plate can be made to contact the metal parts around the body and adsorbed by the magnetic force of the magnetic plate. The magnetic plates and installation plates on both sides of the body cooperate with each other to achieve the effect of fixing the controller. By setting reinforcing fixtures, mounting grooves, and mounting parts, the mounting parts are inserted into the mounting grooves and tightly combined with each other, and the reinforcing fixtures are firmly installed on the outside of the body. When the body is subjected to strong external impact, the reinforcing fixtures can withstand the force generated by the impact, avoid damage and deformation of the body, and enhance the protection effect of the body itself.

[0006] The above-mentioned device utilizes a protective device to protect the power supply body during use, thereby preventing dust accumulation and clogging. However, the protective device in the above-mentioned device only protects the power supply body, and the power supply intelligent controller is easily affected by mist and water droplets generated by heat, thereby affecting the operation of internal components. Therefore, in actual use, the power supply intelligent controller may be damaged by mist and water droplets generated by heat, resulting in damage to components. Summary of the invention

[0007] The object of the present invention is to provide an intelligent controller for an underground AC charging pile power supply, so as to solve the problem in the above background technology that the intelligent controller for the power supply is damaged by mist and water droplets generated by heat, resulting in zero device damage.

[0008] To achieve the above object, the present invention provides the following technical solution: an underground AC charging pile power intelligent controller, including a box body and a protective shell, and also including: An intelligent integrated board is fixedly installed on the inner side of the box, a control switch is fixedly installed on the inner side of the box, an intelligent controller is movably installed on the inner side of the protective shell, and a protective mechanism for easy disassembly and assembly is provided between the intelligent integrated board and the intelligent controller; A control switch is fixedly installed on the inner side of the box body, a dust removal box is fixedly installed on the bottom surface of the protective shell, and a dust removal mechanism that is easy to replace is provided between the dust removal box and the control switch; A heat sink is fixedly mounted on the inner side of the box body, a heat sink is fixedly mounted on the inner side of the protective shell, and a heat sink for rapid cooling is arranged between the heat sink and the heat sink.

[0009] Furthermore, a screw is threadedly installed on the inner side surface of the protective shell, a box is threadedly installed on the outer surface of the screw, and the box and the protective shell are fixedly connected by the screw, and a heat dissipation hole is opened on the inner side surface of the box.

[0010] Furthermore, a relay is fixedly mounted on the inner side surface of the box, a transmission line is fixedly mounted on the outer surface of the relay, a protective shell is fixedly mounted on the outer surface of the transmission line, and a control switch is fixedly mounted on the outer surface of the relay.

[0011] Furthermore, a connecting wire is fixedly mounted on the outer surface of the control switch, a power supply assembly is fixedly mounted on the outer surface of the connecting wire, a heat sink is fixedly mounted on the bottom surface of the power supply assembly, and the power supply assembly and the heat sink form an integrated structure.

[0012] Furthermore, a power output line is fixedly installed on the outer surface of the power supply component, the heat dissipation mechanism includes the power output line, a drive component is fixedly installed on the outer surface of the power output line, and a heat dissipation fan is rotatably installed on the outer surface of the drive component, and the drive component and the heat dissipation fan form a rotating structure.

[0013] Furthermore, a display is fixedly mounted on the outer surface of the intelligent controller, an adjustment knob is rotatably mounted on the outer surface of the intelligent controller, a positioning nut is threadedly mounted on the inner surface of the intelligent controller, and a slide rail is fixedly mounted on the outer surface of the intelligent controller.

[0014] Furthermore, a connecting block is fixedly installed on the outer surface of the slide rail, and the protection mechanism includes a connecting block, a positioning rod is movably installed on the inner side of the connecting block, a snap ball is movably installed on the outer surface of the connecting block, and an intelligent controller is fixedly installed on the outer surface of the positioning rod, a stop block is fixedly installed on the inner end of the intelligent controller, and the connecting block and the positioning rod form a sliding structure.

[0015] Furthermore, an integrated circuit board is fixedly mounted on the inner end of the intelligent controller, a capacitor is fixedly mounted on the outer surface of the integrated circuit board, and a signal data board is fixedly mounted on the outer surface of the integrated circuit board.

[0016] Furthermore, the inner end of the box body is movably abutted against a dust removal box, a dust adsorption net is movably mounted on the inner side of the dust removal box, the dust removal mechanism includes a dust adsorption net, and a fixed block is fixedly mounted on the outer surface of the dust adsorption net.

[0017] Furthermore, a handle is fixedly installed on the outer surface of the fixed block, limit springs are fixedly installed on both sides of the fixed block, a limit block is fixedly installed on the outer surface of the limit spring, the limit block is movably abutted against the inner end of the fixed block, and the limit spring and the limit block form a telescopic structure.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The specific contents of the underground AC charging pile power intelligent controller are as follows: 1. Fix the protective shell in the box with screws to fix the intelligent controller and protect the intelligent controller from collision damage, so as to improve the safety of the equipment. The screws can be removed with tools to facilitate maintenance of the internal equipment. Furthermore, the internal power supply is controlled to close by the control switch, and the relay is used to increase the stability of the control switch to prevent leakage of electrical equipment. The current is introduced into the intelligent controller inside the protective shell through the transmission line, and the power supply component is connected through the connecting line to facilitate the power supply of the equipment and improve the overall transmission speed; Furthermore, the current of the power supply component is transmitted to the drive component through the power output line, and the drive component is used to drive the cooling fan to rotate. The cooling fan discharges the internal heat through the heat dissipation holes opened in the box, thereby reducing the heat inside the equipment and avoiding damage to the electrical equipment due to excessive temperature.

[0019] 2. The status of the intelligent controller can be easily viewed through the display. The transmission speed of the intelligent controller can be easily adjusted by manually turning the adjustment knob. The intelligent controller can be fixed by the positioning nut. By manually pulling the intelligent controller, the installed slide rail drives the connecting block to slide. The connecting block is limited by the positioning rod to prevent the connecting block from falling off. The snap ball set on the connecting block is positioned with the block installed on the intelligent controller to fix the slide rail. By opening the intelligent controller, it is convenient for personnel to repair and replace the internal electrical equipment; Furthermore, the dust removal box installed by the protective shell prevents dust from splashing outside after falling, thereby facilitating the adsorption of the dust adsorption net, and the dust adsorption net is used to adsorb the dust, thereby preventing dust from accumulating in the electrical equipment; Furthermore, the limit block is driven to engage in the dust removal box through the expansion and contraction of the limit spring, and the limit block is manually pressed, so that the limit block drives the limit spring to expand and contract, and the handle is manually pulled toward the rear end of the box body, so that the handle drives the fixed block to move, and the fixed block drives the dust adsorption net, thereby facilitating the replacement and cleaning of the dust adsorption net and preventing the accumulation of dust inside from causing the dust adsorption net to be blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2It is a schematic diagram of the cross-sectional structure of the box body of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the protective shell of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the power supply assembly of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the dust removal box of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the heat dissipation box of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the intelligent controller of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the slide rail of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the integrated circuit board of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the connecting block of the present invention.

[0021] In the figure: 1. Box body; 2. Protective shell; 3. Intelligent integrated board; 4. Intelligent controller; 5. Dust removal box; 6. Heat dissipation plate; 7. Relay; 8. Control switch; 9. Connecting wire; 10. Power supply assembly; 11. Heat dissipation box; 12. Heat dissipation hole; 13. Transmission line; 14. Screw; 15. Positioning nut; 16. Display; 17. Adjustment knob; 18. Power output line; 19. Drive assembly; 20. Cooling fan; 21. Slide rail; 22. Connecting block; 23. Positioning rod; 24. Integrated circuit board; 25. Capacitor; 26. Signal data board; 27. Dust adsorption net; 28. Fixing block; 29. ​​Handle; 30. Limit spring; 31. Limit block; 32. Stop block; 33. Buckle ball. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1: Please refer to Figure 1-Figure 10The present invention provides the following technical solutions: an underground AC charging pile power intelligent controller, including a box body 1 and a protective shell 2, and also includes: an intelligent integrated board 3 is fixedly installed on the inner side of the box body 1, a control switch 8 is fixedly installed on the inner side of the box body 1, an intelligent controller 4 is movably installed on the inner side of the protective shell 2, and a protective mechanism for easy disassembly and assembly is arranged between the intelligent integrated board 3 and the intelligent controller 4; a control switch 8 is fixedly installed on the inner side of the box body 1, a dust removal box 5 is fixedly installed on the bottom surface of the protective shell 2, and a dust removal mechanism for easy replacement is arranged between the dust removal box 5 and the control switch 8; a heat dissipation box 11 is fixedly installed on the inner side of the box body 1, a heat dissipation plate 6 is fixedly installed on the inner side of the protective shell 2, and a heat dissipation mechanism for rapid cooling is arranged between the heat dissipation plate 6 and the heat dissipation box 11.

[0024] The intelligent controller 4 is protected by a protective mechanism that is easy to disassemble and assemble and is arranged between the intelligent integrated board 3 and the intelligent controller 4, thereby increasing the safety of the equipment, and the dust inside the equipment is removed by a dust removal mechanism that is easy to replace and is arranged between the dust removal box 5 and the control switch 8, thereby preventing dust from accumulating inside the equipment and causing damage to components, and the temperature inside the box body 1 is reduced by a fast cooling heat dissipation mechanism arranged between the heat dissipation plate 6 and the heat dissipation box 11, thereby avoiding damage to electrical equipment due to excessive temperature.

[0025] Example 2: Based on Example 1, please refer to Figure 1-Figure 10 , a power supply assembly 10 is also disclosed, and its specific structure is as follows: a screw 14 is threadedly installed on the inner side surface of the protective shell 2, a box body 1 is threadedly installed on the outer surface of the screw 14, and the box body 1 and the protective shell 2 are fixedly connected by the screw 14, a heat dissipation hole 12 is opened on the inner side surface of the box body 1, a relay 7 is fixedly installed on the inner side surface of the box body 1, a transmission line 13 is fixedly installed on the outer surface of the relay 7, the protective shell 2 is fixedly installed on the outer surface of the transmission line 13, and a control switch 8 is fixedly installed on the outer surface of the relay 7, a connecting line 9 is fixedly installed on the outer surface of the control switch 8, a power supply assembly 10 is fixedly installed on the outer surface of the connecting line 9, and a heat dissipation box 11 is fixedly installed on the bottom surface of the power supply assembly 10, and the power supply assembly 10 and the heat dissipation box 11 form an integrated structure, a power output line 18 is fixedly installed on the outer surface of the power supply assembly 10, and the heat dissipation mechanism includes the power output line 18, a drive assembly 19 is fixedly installed on the outer surface of the power output line 18, and a heat dissipation fan 20 is rotatably installed on the outer surface of the drive assembly 19, and the drive assembly 19 and the heat dissipation fan 20 form a rotating structure.

[0026] The protective shell 2 is fixed in the box body 1 by screws 14, so as to fix the intelligent controller 4 and protect the intelligent controller 4 from collision damage, so as to achieve the purpose of improving the safety of the equipment. The screws 14 are removed by tools to facilitate personnel to repair the internal equipment. The internal power is closed by the control switch 8, and the stability of the control switch 8 is increased by the relay 7 to prevent the electrical equipment from leaking. The current is introduced into the intelligent controller 4 inside the protective shell 2 through the transmission line 13, and the power supply component 10 is connected by the connecting line 9 to facilitate the power supply of the equipment and improve the overall transmission speed. The current of the power supply component 10 is transmitted to the drive component 19 through the power output line 18, and the drive component 19 is used to drive the cooling fan 20 to rotate. The cooling fan 20 discharges the internal heat through the heat dissipation holes 12 opened in the box body 1, so as to reduce the heat inside the equipment and avoid damage to the electrical equipment due to excessive temperature.

[0027] Example 3: Based on Example 1, please refer to Figure 1-Figure 10 , an integrated circuit board 24 is also disclosed, and its specific structure is as follows: a display 16 is fixedly installed on the outer surface of the intelligent controller 4, an adjusting knob 17 is rotatably installed on the outer surface of the intelligent controller 4, a positioning nut 15 is threadedly installed on the inner side surface of the intelligent controller 4, and a slide rail 21 is fixedly installed on the outer surface of the slide rail 21, a connecting block 22 is fixedly installed on the outer surface of the slide rail 21, a protective mechanism includes a connecting block 22, a positioning rod 23 is movably installed on the inner side surface of the connecting block 22, a buckle ball 33 is movably installed on the outer surface of the connecting block 22, and the outer surface of the positioning rod 23 is fixedly installed with the intelligent controller 4, a stopper 32 is fixedly installed on the inner end of the intelligent controller 4, and the connecting block 22 and the positioning rod 23 form a sliding structure, the intelligent controller 4 is fixedly installed with the outer surface of the positioning rod 23, and the intelligent controller 4 is fixedly installed with the inner end of the intelligent controller 4. The connecting block 22 and the positioning rod 23 form a sliding structure. An integrated circuit board 24 is fixedly installed on the inner end of the energy controller 4, a capacitor 25 is fixedly installed on the outer surface of the integrated circuit board 24, and a signal data board 26 is fixedly installed on the outer surface of the integrated circuit board 24, the inner end of the box body 1 is movably abutted with a dust removal box 5, and a dust adsorption net 27 is movably installed on the inner side of the dust removal box 5, the dust removal mechanism includes a dust adsorption net 27, and a fixed block 28 is fixedly installed on the outer surface of the dust adsorption net 27, a handle 29 is fixedly installed on the outer surface of the fixed block 28, limit springs 30 are fixedly installed on both sides of the fixed block 28, and a limit block 31 is fixedly installed on the outer surface of the limit spring 30, the limit block 31 is movably abutted against the inner end of the fixed block 28, and the limit spring 30 and the limit block 31 form a telescopic structure.

[0028] The display 16 is convenient for viewing the state of the intelligent controller 4, and the adjusting knob 17 is manually turned to adjust the transmission speed of the intelligent controller 4. The intelligent controller 4 is fixed by the positioning nut 15. By manually pulling the intelligent controller 4, the installed slide rail 21 drives the connecting block 22 to slide, and the connecting block 22 is limited by the positioning rod 23 to prevent the connecting block 22 from falling off, and the snap ball 33 set by the connecting block 22 is positioned with the stopper 32 installed by the intelligent controller 4, so as to fix the slide rail 21. By opening the intelligent controller 4, it is convenient for personnel to repair and replace the internal electrical equipment, and the protective shell is used to open the intelligent controller 4. The dust removal box 5 installed on the 2 prevents dust from splashing outside after falling, thereby facilitating the adsorption of the dust adsorption net 27. The dust adsorption net 27 is used to adsorb dust, thereby preventing dust from accumulating in the electrical equipment. The limit block 31 is driven to engage in the dust removal box 5 through the extension and contraction of the limit spring 30. The limit block 31 is manually pressed, and the limit spring 30 is driven to extend and contract by the limit block 31. The handle 29 is manually pulled out to the rear end of the box body 1. The handle 29 drives the fixed block 28 to move, and the fixed block 28 drives the dust adsorption net 27, thereby facilitating the replacement and cleaning of the dust adsorption net 27, and preventing the dust adsorption net 27 from being blocked due to the accumulation of internal dust.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An underground AC charging pile power intelligent controller, comprising a box (1) and a protective shell (2), characterized in that: Also includes: An intelligent integrated board (3) is fixedly mounted on the inner side of the box (1), a control switch (8) is fixedly mounted on the inner side of the box (1), an intelligent controller (4) is movably mounted on the inner side of the protective shell (2), and a protective mechanism for easy disassembly and assembly is provided between the intelligent integrated board (3) and the intelligent controller (4); A control switch (8) is fixedly mounted on the inner side surface of the box body (1), a dust removal box (5) is fixedly mounted on the bottom surface of the protective shell (2), and a dust removal mechanism that is easy to replace is provided between the dust removal box (5) and the control switch (8); A heat sink (11) is fixedly mounted on the inner side of the box body (1), a heat sink (6) is fixedly mounted on the inner side of the protective shell (2), and a heat sink mechanism for rapid temperature reduction is provided between the heat sink (6) and the heat sink (11).

2. The intelligent controller for underground AC charging pile power supply according to claim 1, characterized in that: The inner side surface of the protective shell (2) is threadedly mounted with a screw (14), the outer surface of the screw (14) is threadedly mounted with a box body (1), and the box body (1) and the protective shell (2) are fixedly connected by the screw (14), and the inner side surface of the box body (1) is provided with a heat dissipation hole (12).

3. The intelligent controller for underground AC charging pile power supply according to claim 2, characterized in that: A relay (7) is fixedly mounted on the inner side surface of the box body (1), a transmission line (13) is fixedly mounted on the outer surface of the relay (7), a protective shell (2) is fixedly mounted on the outer surface of the transmission line (13), and a control switch (8) is fixedly mounted on the outer surface of the relay (7).

4. The intelligent controller for underground AC charging pile power supply according to claim 3 is characterized in that: A connecting wire (9) is fixedly mounted on the outer surface of the control switch (8), a power supply assembly (10) is fixedly mounted on the outer surface of the connecting wire (9), and a heat sink (11) is fixedly mounted on the bottom surface of the power supply assembly (10), and the power supply assembly (10) and the heat sink (11) form an integrated structure.

5. The intelligent controller for underground AC charging pile power supply according to claim 4, characterized in that: A power output line (18) is fixedly mounted on the outer surface of the power supply assembly (10), the heat dissipation mechanism comprises the power output line (18), a drive assembly (19) is fixedly mounted on the outer surface of the power output line (18), and a heat dissipation fan (20) is rotatably mounted on the outer surface of the drive assembly (19), and the drive assembly (19) and the heat dissipation fan (20) form a rotating structure.

6. The intelligent controller for underground AC charging pile power supply according to claim 1, characterized in that: A display (16) is fixedly mounted on the outer surface of the intelligent controller (4), an adjustment knob (17) is rotatably mounted on the outer surface of the intelligent controller (4), a positioning nut (15) is threadedly mounted on the inner side surface of the intelligent controller (4), and a slide rail (21) is fixedly mounted on the outer surface of the intelligent controller (4).

7. An underground AC charging pile power intelligent controller according to claim 6, characterized in that: A connecting block (22) is fixedly mounted on the outer surface of the slide rail (21); the protective mechanism comprises a connecting block (22); a positioning rod (23) is movably mounted on the inner side surface of the connecting block (22); a buckle ball (33) is movably mounted on the outer surface of the connecting block (22); an intelligent controller (4) is fixedly mounted on the outer surface of the positioning rod (23); a stopper (32) is fixedly mounted on the inner end of the intelligent controller (4); and the connecting block (22) and the positioning rod (23) form a sliding structure.

8. The intelligent controller for underground AC charging pile power supply according to claim 6, characterized in that: An integrated circuit board (24) is fixedly mounted on the inner end of the intelligent controller (4), a capacitor (25) is fixedly mounted on the outer surface of the integrated circuit board (24), and a signal data board (26) is fixedly mounted on the outer surface of the integrated circuit board (24).

9. The intelligent controller for underground AC charging pile power supply according to claim 3, characterized in that: The inner end of the box body (1) is movably abutted against a dust removal box (5), a dust adsorption net (27) is movably mounted on the inner side surface of the dust removal box (5), the dust removal mechanism comprises a dust adsorption net (27), and a fixing block (28) is fixedly mounted on the outer surface of the dust adsorption net (27).

10. An underground AC charging pile power intelligent controller according to claim 9, characterized in that: A handle (29) is fixedly mounted on the outer surface of the fixed block (28), limit springs (30) are fixedly mounted on both sides of the fixed block (28), a limit block (31) is fixedly mounted on the outer surface of the limit spring (30), the limit block (31) is movably abutted against the inner end of the fixed block (28), and the limit spring (30) and the limit block (31) form a telescopic structure.

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