Novel modularized plate-type industrial button switch self-locking structure

By combining a modular plate structure with the principle of fixed-axis gear rotation, the industrial push-button switch can be easily assembled and maintained, solving the problem of complex operation of traditional push-button switches and improving the flexibility and smoothness of the wiring terminals.

CN223539475UActive Publication Date: 2025-11-11JIANGYIN SINBON ELECTRONICS CO LTD
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Patent Information

Application Number
CN202423036122.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-10
Publication Date
2025-11-11
Estimated Expiration
2034-12-10

AI Technical Summary

Technical Problem

Traditional industrial push-button switches are complex to assemble and maintain, have poor flexibility in the number and layout of wiring terminals, and are not convenient to assemble, use, and maintain.

Method used

Adopting a modular plate structure and combining the principle of gear fixed-axis rotation, the smooth switching of the switching mode and the self-locking function are achieved through the cooperation of the sliding pawl sleeve, operating parts and push rod, simplifying the assembly process.

Benefits of technology

It improves the ease of assembly, use, and maintenance of industrial push-button switches, simplifies the assembly process, and enhances the flexibility of wiring terminals and the smoothness of operation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a novel modularized plate-type industrial button switch self-locking structure, which comprises a PCB, a plate-type switch and an indicating lamp, the plate-type switch and the indicating lamp are fixedly assembled on the PCB, a transmission gasket is clamped and assembled above the PCB, a pair of springs is arranged between the transmission gasket and the PCB, a sliding claw sleeve is arranged above the transmission gasket, and the sliding claw sleeve is sleeved on the PCB. A fixed seat is sleeved above the sliding claw sleeve, an operation panel is fixedly assembled above the fixed seat, an operation part is assembled in the operation panel in a sliding manner, and a push rod is arranged between the operation part and the sliding claw sleeve. According to the novel modularized plate-type industrial button switch self-locking structure disclosed by the utility model, the switching of switch modes is realized by adopting the principle of gear fixed-axis rotation, the smooth switching of the button switch between pressing locking and pressing resetting is improved, the self-locking structure of the industrial button switch is simplified, and the service life of the industrial button switch is prolonged. And the convenience in assembly, use and maintenance of the industrial button switch is improved.
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Description

Technical Field

[0001] This utility model belongs to the field of industrial push button switch technology, specifically relating to a novel modular panel industrial push button switch self-locking structure. Background Technology

[0002] An industrial push-button switch is a basic control electrical device that uses a simple mechanical mechanism to switch circuits and issue control commands. It is mainly used to operate industrial automation control equipment such as contactors, relays, and electromagnetic starters. The basic principle of an industrial push-button switch is that by pushing the button, the moving contact is connected or disconnected from the stationary contact, thereby realizing the conduction and disconnection of the circuit.

[0003] Traditional industrial push-button switches are mainly assembled using screw wiring. Although these industrial push-button switches have a simple and reliable structure, the assembly process usually requires multiple steps and the use of various tools. This makes it more complicated and time-consuming to change or adjust the wiring. At the same time, the compact internal structure also limits the number of terminals and the flexibility of their layout, making the assembly, use and maintenance of industrial push-button switches less convenient.

[0004] Therefore, to address the aforementioned technical issues, it is necessary to provide a novel modular panel-type industrial push-button switch self-locking structure.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this utility model is to provide a novel modular panel industrial push button switch self-locking structure, which can improve the ease of assembly, use and maintenance of industrial push button switches.

[0007] To achieve the above objectives, a specific embodiment of this utility model provides a novel modular industrial push button switch self-locking structure, including a PCB board, a board switch, and an indicator light. The board switch and indicator light are both fixedly mounted on the PCB board. A transmission washer is engaged on the top of the PCB board. A pair of springs are arranged between the transmission washer and the PCB board. A sliding pawl sleeve is arranged above the transmission washer. A fixing seat is fitted on the top of the sliding pawl sleeve. An operation panel is fixedly mounted on the top of the fixing seat. An operation component is slidably mounted inside the operation panel. A push rod is arranged between the operation component and the sliding pawl sleeve. The operation component and the push rod are both correspondingly arranged with respect to the sliding pawl sleeve.

[0008] In one or more embodiments of this utility model, the transmission pad consists of a pad plate, a pair of claws, and a pair of limiting guide posts. The claws and limiting guide posts are all fixedly mounted below the pad plate. A clearance hole is provided at the center of the pad plate, corresponding to an indicator light. By providing clearance space for the indicator light, it facilitates subsequent observation and judgment of the disconnection and contact status of the PCB board by observing the on / off state of the indicator light.

[0009] In one or more embodiments of this utility model, a pair of insertion limiting holes are provided on the PCB board, and a pair of claws are engaged and assembled within the insertion limiting holes. The assembly of the pair of claws with the insertion limiting holes limits the movement of the transmission pad. The pair of claws and the limiting guide posts are staggered, and a pair of springs are sleeved on the outside of the pair of limiting guide posts. The cooperation between the limiting guide posts and the springs limits the movement of the transmission pad.

[0010] In one or more embodiments of this utility model, the sliding claw sleeve is composed of a sliding cylinder, a limiting bottom cylinder and a plurality of sliding claws. The limiting bottom cylinder is integrally assembled below the sliding cylinder, and the plurality of sliding claws are evenly distributed on the outside of the sliding cylinder, and the plurality of sliding claws are fixedly connected to the sliding cylinder and the limiting bottom cylinder.

[0011] In one or more embodiments of this utility model, the number of sliding claws is four, and the top surface of each sliding claw is inclined. This facilitates the movement and locking of the push rod through the interaction of the inclined surface of the sliding claw with the operating teeth and the operating connecting tube.

[0012] In one or more embodiments of this utility model, a pair of fixing screws are fixedly connected between the fixing base and the operation panel. The fixing screws are used to assemble and fix the fixing base and the operation panel.

[0013] In one or more embodiments of this utility model, the operating component comprises an operating outer cylinder, a limiting kit, and multiple operating teeth. The outer operating cylinder has external threads on its outer side and is threadedly fitted into a fixed seat. The interplay of the internal and external threads limits the assembly of the operating outer cylinder. The limiting kit is fixedly mounted above the operating outer cylinder, and the multiple operating teeth are evenly distributed below the operating outer cylinder. The engagement of the operating teeth with the sliding pawl locks and limits the push rod.

[0014] In one or more embodiments of this utility model, the number of the plurality of operating teeth is four, and the plurality of operating teeth cooperate to form a disengagement and engagement gap, which is configured to cooperate with a sliding pawl. The push rod is disengaged and self-locked by the cooperation of the disengagement and engagement gap with the sliding pawl. The side of the operating tooth opposite to the operating outer cylinder consists of two parts: a short inclined surface and a long inclined surface. The short inclined surface and the long inclined surface are arranged in a stepped manner, with the short inclined surface positioned below the long inclined surface. The push rod is connected and self-locked by the cooperation of the long inclined surface with the inclined surface of the sliding pawl.

[0015] In one or more embodiments of this utility model, a washer is provided between the operating component and the push rod, and the washer is fitted onto the outside of the push rod. The washer provides a sealed assembly of the push rod, reducing the adverse effects of humid environments and liquids on the PCB board. The push rod consists of an operating connecting tube, an assembly tube, and a light-transmitting pressing plate. The assembly tube is fixedly assembled above the operating connecting tube, and the light-transmitting pressing plate is fixedly assembled inside the assembly tube.

[0016] In one or more embodiments of this utility model, the outer side of the operating connecting tube is integrally formed with multiple evenly distributed limiting protrusions, and the inner wall of the operating outer cylinder is provided with multiple evenly distributed clearance grooves. The limiting protrusions are slidably fitted into the clearance grooves. Through the cooperation between the limiting protrusions and the clearance grooves, the push rod can move radially within the operating component without rotating. The bottom of the operating connecting tube is serrated. Through the cooperation between the serrated bottom of the operating connecting tube and the sliding claw, the sliding claw sleeve can be pressed and moved by pressing the operating connecting tube.

[0017] Compared with the prior art, the present invention discloses a novel modular panel industrial push button switch self-locking structure, which realizes the switching mode switching by adopting the principle of gear fixed axis rotation, thereby improving the smooth transition of the push button switch between pressing and locking and pressing and resetting.

[0018] At the same time, it simplifies the self-locking structure of industrial push-button switches and improves the ease of assembly, use, and maintenance of industrial push-button switches. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural view of a novel modular panel industrial push button switch self-locking structure according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of a novel modular panel industrial push button switch self-locking structure according to one embodiment of the present invention;

[0022] Figure 3 This is a perspective view of the push rod in one embodiment of the present invention;

[0023] Figure 4 This is a perspective view of the operating components in one embodiment of the present invention;

[0024] Figure 5 This is a top view of the operating component in one embodiment of the present invention;

[0025] Figure 6 This is a perspective view of the sliding claw sleeve in one embodiment of the present invention;

[0026] Figure 7 This is a perspective view of the fixing base in one embodiment of the present utility model;

[0027] Figure 8 This is a perspective view of the transmission pad in one embodiment of the present invention;

[0028] Figure 9 This is a perspective view of a novel modular panel-type industrial push button switch self-locking structure according to an embodiment of the present invention;

[0029] Figure 10 This is a front sectional view of a novel modular panel industrial push button switch self-locking structure according to an embodiment of the present invention;

[0030] Figure 11 for Figure 10 Schematic diagram of the structure at point A in the middle;

[0031] Figure 12 This is a flowchart illustrating the pressed and locked state of a novel modular panel industrial push button switch self-locking structure in one embodiment of the present invention.

[0032] Figure 13 This is a flowchart illustrating the pressed reset state of a novel modular panel industrial push button switch self-locking structure in one embodiment of the present invention.

[0033] Explanation of key figure labels:

[0034] 1-PCB board, 2-panel switch, 3-indicator light, 4-transmission pad, 401-pad, 402-claw, 403-limit guide post, 5-spring, 6-sliding claw sleeve, 601-sliding cylinder, 602-limiting bottom cylinder, 603-sliding claw, 7-fixed base, 8-operation panel, 9-operation components, 901-operation outer cylinder, 902-limiting kit, 903-operation teeth, 10-push rod, 1001-operation connecting tube, 1002-assembly tube, 1003-light-transmitting pressing plate, 11-fixing screw, 12-washer. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0036] like Figures 1 to 13 As shown, a novel modular industrial push button switch self-locking structure according to one embodiment of the present invention includes a PCB board 1, a board switch 2 and an indicator light 3, wherein the board switch 2 and the indicator light 3 are both fixedly assembled on the PCB board 1.

[0037] like Figures 1 to 8 As shown, a transmission washer 4 is fitted onto the top of the PCB board 1. The operating force of the spring 5 is transmitted through the transmission washer 4, thereby facilitating the control of the opening and closing of the panel switch 2.

[0038] like Figure 8 As shown, the transmission pad 4 consists of a pad 401, a pair of claws 402 and a pair of limiting guide posts 403. The pair of claws 402 and the limiting guide posts 403 are all fixedly assembled below the pad 401.

[0039] Specifically, a clearance hole is provided at the center of the pad 401, and the clearance hole is correspondingly set with the indicator light 3. By providing clearance space for the indicator light 3, it is easier to observe and judge the disconnection and contact status of the PCB board 1 by observing the on / off state of the indicator light 3.

[0040] like Figures 1 to 9 As shown, a pair of insertion limiting holes are provided on the PCB board 1, and a pair of claws 402 are engaged and assembled in the insertion limiting holes. The transmission pad 4 is assembled and limited by the engagement of the pair of claws 402 with the insertion limiting holes.

[0041] like Figures 1 to 10As shown, a pair of claws 402 and limiting guide posts 403 are staggered, and a pair of springs 5 ​​are both sleeved on the outside of the pair of limiting guide posts 403. The cooperation between the limiting guide posts 403 and the springs 5 ​​plays a role in limiting the movement of the transmission pad 4.

[0042] Preferably, the length of the pair of limit guide posts 403 depends on the height of the panel switch 2 and the total travel of the PCB board 1.

[0043] like Figures 1 to 6 As shown, a sliding pawl sleeve 6 is provided above the transmission pad 4. The sliding pawl sleeve 6 is used for the linkage between the push rod 10 and the operating component 9, and at the same time, it is used to transmit the power of the operating component 9, which facilitates the power transmission to the transmission pad 4.

[0044] like Figure 6 As shown, the sliding claw sleeve 6 is composed of a sliding cylinder 601, a limiting bottom cylinder 602 and multiple sliding claws 603. The limiting bottom cylinder 602 is integrally assembled below the sliding cylinder 601, and multiple sliding claws 603 are evenly distributed on the outside of the sliding cylinder 601, and multiple sliding claws 603 are fixedly connected to the sliding cylinder 601 and the limiting bottom cylinder 602.

[0045] Preferably, there are four sliding claws 603. By setting the number of sliding claws 603 to four, it is convenient to use the sliding claws 603 to cooperate with multiple disengagement and engagement gaps to rotate and lock the operating component 9 by 90 degrees.

[0046] Specifically, the top surfaces of the multiple sliding claws 603 are all inclined. This facilitates the movement and locking of the push rod 10 through the interaction of the inclined surfaces of the sliding claws 603 with the operating teeth 903 and the operating connecting pipe 1001.

[0047] like Figures 1 to 7 As shown, a fixing seat 7 is fitted on the upper part of the sliding pawl sleeve 6. The fixing seat 7 is used to assemble and fix the sliding pawl sleeve 6, the operation panel 8, the operation component 9 and the push rod 10.

[0048] like Figures 1 to 2 As shown, an operation panel 8 is fixedly mounted on the top of the mounting base 7. The mounting base 7 is assembled and fixed via the operation panel 8. Simultaneously, the operation panel 8 and the button mounting housing can be used for assembly and positioning.

[0049] like Figures 1 to 2 As shown, a pair of fixing screws 11 are fixedly connected between the fixing base 7 and the operation panel 8. The fixing screws 11 are used to assemble and fix the fixing base 7 and the operation panel 8.

[0050] like Figures 1 to 4 As shown, an operating component 9 is slidably mounted inside the operating panel 8. The operating component 9, in cooperation with the sliding claw sleeve 6, locks and limits the assembly of the PCB board 1.

[0051] like Figures 1 to 4 As shown, the operating component 9 consists of an operating outer cylinder 901, a limiting kit 902, and multiple operating teeth 903. The outer side of the operating outer cylinder 901 has external threads, and the operating outer cylinder 901 is threadedly assembled into the fixed seat 7. The operating outer cylinder 901 is assembled and limited by the mutual cooperation of the internal and external threads.

[0052] like Figures 1 to 5 As shown, the limiting kit 902 is fixedly mounted on the upper part of the operating outer cylinder 901, and multiple operating teeth 903 are evenly distributed below the operating outer cylinder 901. The push rod 10 is locked and limited by the cooperation between the operating teeth 903 and the sliding pawl 603.

[0053] Specifically, there are four operating teeth 903, which cooperate to form a disengagement and engagement gap. This disengagement and engagement gap is configured to cooperate with the sliding pawl 603. The push rod 10 is disengaged and self-locked by cooperating with the sliding pawl 603 through the disengagement and engagement gap.

[0054] The operating tooth 903, on the side opposite to the operating outer cylinder 901, consists of a short inclined surface and a long inclined surface. The short and long inclined surfaces are arranged in a stepped manner, with the short inclined surface positioned below the long inclined surface. The push rod 10 is self-locked by engaging with the inclined surface of the slide pawl 603 through the long inclined surface.

[0055] like Figures 1 to 2 As shown, a washer 12 is provided between the operating component 9 and the push rod 10, and the washer 12 is fitted onto the outside of the push rod 10. The push rod 10 is sealed by the washer 12, which reduces the adverse effects of humid environments and liquids on the PCB board 1.

[0056] like Figures 1 to 3 As shown, a push rod 10 is arranged between the operating component 9 and the sliding pawl sleeve 6, and both the operating component 9 and the push rod 10 are arranged corresponding to the sliding pawl sleeve 6.

[0057] like Figures 1 to 3 As shown, the push rod 10 consists of an operation connecting tube 1001, an assembly tube 1002, and a light-transmitting pressing plate 1003. The assembly tube 1002 is fixedly assembled above the operation connecting tube 1001, and the light-transmitting pressing plate 1003 is fixedly assembled inside the assembly tube 1002.

[0058] like Figures 1 to 5 As shown, the outer side of the operating connecting pipe 1001 is integrally formed with multiple evenly distributed limiting protrusions, and the inner wall of the operating outer cylinder 901 is provided with multiple evenly distributed clearance grooves. The limiting protrusions are slidably assembled in the clearance grooves. Through the cooperation of the limiting protrusions and the clearance grooves, the push rod 10 can move radially within the operating component 9 without rotating.

[0059] Specifically, the bottom of the operating connecting tube 1001 is serrated. By cooperating with the serrated bottom of the operating connecting tube 1001 and the sliding claw 603, the sliding claw sleeve 6 can be pressed and moved by pressing the operating connecting tube 1001.

[0060] like Figure 12 As shown, when the PCB board 1 is pressed and locked, the operator can press the light-transmitting pressing plate 1003. The operating connecting tube 1001 and the operating component 9 move radially under the downward force of the finger and the guiding engagement of the limiting protrusion on the outer side of the operating connecting tube 1001 and the clearance groove on the inner wall of the operating outer cylinder 901. This allows the sliding pawl 603 to drive the pad 401 to press the spring 5 under the action of the serrated bottom of the operating connecting tube 1001. Subsequently, when the finger pressing the light-transmitting pressing plate 1003 is released, the sliding pawl 603 rotates relative to the serrated bottom of the operating connecting tube 1001 under the action of its own inclined surface, and the inclined surface of the sliding pawl 603 can contact the long inclined surface of the operating tooth 903. Then, the sliding pawl 603 slides down between the short and long inclined surfaces under the action of its own inclined surface and the long inclined surface, causing the operating tooth 903 to engage and limit the sliding pawl 603. At this time, the pad 401 compresses the spring 5 under the action of the sliding claw 603, and the pad 401 can press the hand switch 2, thereby realizing the pressing and locking of the hand switch 2.

[0061] like Figure 13 As shown, when the PCB board 1 is pressed to reset, the operating connecting tube 1001 and the operating component 9 move radially under the downward force of the finger and the guiding engagement of the limiting protrusion on the outer side of the operating connecting tube 1001 and the clearance groove on the inner wall of the operating outer cylinder 901. This allows the sliding pawl 603 to drive the pad 401 to press the spring 5 under the action of the serrated bottom of the operating connecting tube 1001. Subsequently, when the finger pressing the light-transmitting pressing plate 1003 is released, the sliding pawl 603 rotates relative to the serrated bottom of the operating connecting tube 1001 under the action of the inclined surface. The inclined surface of the sliding pawl 603 can contact the short inclined surface of the operating tooth 903. The sliding pawl 603 slides down into the disengagement and engagement gap under the action of its own inclined surface and the short inclined surface. At this time, the pad 401 bounces up under the action of the spring 5 and no longer presses the plate switch 2 to conduct, while the sliding pawl 603 slides down into the disengagement and engagement gap to lock.

[0062] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0063] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A novel modular industrial push-button switch self-locking structure, comprising a PCB board, a board switch, and an indicator light, wherein the board switch and the indicator light are both fixedly mounted on the PCB board, characterized in that, A transmission pad is fitted onto the top of the PCB board. A pair of springs are arranged between the transmission pad and the PCB board. A sliding pawl sleeve is arranged above the transmission pad. A fixing seat is fitted onto the top of the sliding pawl sleeve. An operation panel is fixedly mounted above the fixing seat. An operation component is slidably mounted inside the operation panel. A push rod is arranged between the operation component and the sliding pawl sleeve. The operation component and the push rod are both arranged correspondingly to the sliding pawl sleeve.

2. The novel modular panel-type industrial push-button switch self-locking structure according to claim 1, characterized in that, The transmission pad consists of a pad plate, a pair of claws and a pair of limiting guide posts. The pair of claws and limiting guide posts are fixedly assembled below the pad plate. A clearance hole is provided at the center of the pad plate, and the clearance hole is set corresponding to the indicator light.

3. The novel modular panel-type industrial push-button switch self-locking structure according to claim 2, characterized in that, The PCB board has a pair of insertion limiting holes, and the pair of claws are engaged and assembled in the insertion limiting holes. The pair of claws and the limiting guide posts are staggered, and the pair of springs are sleeved on the outside of the pair of limiting guide posts.

4. The novel modular panel-type industrial push-button switch self-locking structure according to claim 1, characterized in that, The sliding claw sleeve consists of a sliding cylinder, a limiting bottom cylinder, and multiple sliding claws. The limiting bottom cylinder is integrally assembled below the sliding cylinder, and the multiple sliding claws are evenly distributed on the outside of the sliding cylinder, and the multiple sliding claws are fixedly connected to the sliding cylinder and the limiting bottom cylinder.

5. The novel modular panel-type industrial push-button switch self-locking structure according to claim 4, characterized in that, The number of sliding claws is 4, and the top surface of each sliding claw is set at an angle.

6. The novel modular panel-type industrial push-button switch self-locking structure according to claim 1, characterized in that, A pair of fixing screws are fixedly connected between the mounting base and the operation panel.

7. The novel modular panel-type industrial push-button switch self-locking structure according to claim 5, characterized in that, The operating component consists of an operating outer cylinder, a limiting kit, and multiple operating teeth. The outer side of the operating outer cylinder is provided with external threads. The operating outer cylinder is threadedly assembled in the fixed seat. The limiting kit is fixedly assembled on the upper part of the operating outer cylinder. The multiple operating teeth are evenly distributed on the lower part of the operating outer cylinder.

8. The novel modular panel-type industrial push-button switch self-locking structure according to claim 7, characterized in that, The number of the multiple operating teeth is 4, and the multiple operating teeth cooperate to form a disengagement and engagement gap. The disengagement and engagement gap is configured to cooperate with the sliding pawl. The side of the operating tooth away from the operating outer cylinder consists of two parts: a short inclined surface and a long inclined surface. The short inclined surface and the long inclined surface are arranged in a stepped manner, and the short inclined surface is arranged below the long inclined surface.

9. The novel modular panel industrial push-button switch self-locking structure according to claim 8, characterized in that, A washer is provided between the operating component and the push rod. The washer is fitted on the outside of the push rod. The push rod consists of an operating connecting tube, an assembly tube, and a light-transmitting pressing plate. The assembly tube is fixedly assembled above the operating connecting tube, and the light-transmitting pressing plate is fixedly assembled inside the assembly tube.

10. A novel modular panel-type industrial push-button switch self-locking structure according to claim 9, characterized in that, The outer side of the operating connecting tube is integrally formed with multiple evenly distributed limiting protrusions, and the inner wall of the operating outer cylinder is provided with multiple evenly distributed clearance grooves. The limiting protrusions are slidably assembled in the clearance grooves, and the bottom of the operating connecting tube is serrated.