Low-voltage voltage sensor and use method thereof

Abstract

The invention discloses a low-voltage voltage sensor and a use method thereof, the low-voltage voltage sensor comprises a sensor main body, one end of the sensor main body is provided with a fixing mechanism, an inner cavity of the fixing mechanism is provided with a clamping mechanism, the clamping mechanism comprises a moving assembly, and two sides of the moving assembly are respectively clamped with connecting assemblies; pulling assemblies are arranged on the two sides of one end of the moving assembly, and a rotating mechanism is arranged at one end of the moving assembly; chamfering a groove; a connecting groove; and a pull rope. The arrangement mode that the fixing mechanism, the clamping mechanism and the connecting mechanism are matched is utilized, the terminal connected with the sensor is changed into the connecting assembly, the connecting assembly can be clamped with the clamping mechanism, the external terminal of the sensor can be connected with the sensor body conveniently, and through the arrangement of the fixing mechanism, the sensor body can be connected with the external terminal conveniently. Therefore, the connection between the clamping mechanism and the connecting mechanism is more stable, the separation phenomenon between the terminal and the sensor main body is reduced, and the use stability of the low-voltage voltage sensor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage sensors, and particularly relates to a low-voltage voltage sensor and a method for using the same. Background Art

[0002] A voltage sensor refers to a sensor that can sense the measured voltage and convert it into an available output signal. In various automatic detection and control systems, it is often necessary to track and collect AC and DC voltage signals that change rapidly, and perform spectrum analysis on relatively complex voltage waveforms. Such signals may be high-voltage, large-current, etc. strong electricity, or weak electricity with very poor load capacity or signals with very small amplitudes. A low-voltage voltage sensor controls and displays the low voltage of a device or system, and takes automatic protection measures such as overvoltage and undervoltage when necessary.

[0003] Application No. 201922429632.0 discloses a low-voltage voltage sensor, including a seat body, a connecting cylinder, a cover body and a sensing chip. One end of the connecting cylinder is fixedly connected to the seat body, and the other end is fixedly connected to the cover body, so that a receiving space is jointly formed among the connecting cylinder, the seat body and the cover body for receiving the sensing chip. The seat body includes a vacuum output channel and an assembly groove, where the vacuum output channel penetrates through the seat body and is communicated with the vacuum chamber of the vacuum booster. The assembly groove is clamped with the housing of the vacuum booster to monitor the magnitude of the vacuum pressure in the vacuum booster. However, when the existing low-voltage voltage sensor is connected to external electrical components, it is electrically clamped through a Y-shaped or U-shaped terminal wire, and is screwed tightly with a nut and a terminal post. Repeated nut screwing results in a large amount of energy consumption for wiring. Moreover, the Y-shaped or U-shaped terminal is only locked by the extrusion of the nut. When the terminal wire is strongly pulled, the Y-shaped or U-shaped terminal is easily detached from the terminal post, affecting the stability of the use of the low-voltage voltage sensor. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-voltage voltage sensor and a method for using the same to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A low-voltage voltage sensor, including: a sensor main body, one end of the sensor main body is provided with a fixing mechanism, and a clamping mechanism is arranged in the inner cavity of the fixing mechanism. The clamping mechanism includes:

[0006] A moving component, the moving component slides in the inner cavity of the fixing mechanism, connecting components are respectively clamped on both sides of the moving component, pulling components are arranged on both sides at one end of the moving component, and a rotating mechanism for horizontally pushing the moving component is arranged at one end of the moving component;

[0007] A chamfered groove is opened at one end of the moving component;

[0008] A connecting groove is formed in the middle of the moving component;

[0009] A pull rope is fixed to the other end of the moving component.

[0010] Preferably, the fixing mechanism includes:

[0011] A fixing tube is fixedly inserted and connected to one end of the sensor body, and the moving component slides horizontally in the inner cavity of the fixing tube;

[0012] A waterproof groove is formed at one end of the inner wall of the fixing tube;

[0013] A water drainage hole is formed at the bottom of the inner wall of the waterproof groove;

[0014] A plurality of pressing components, each of the plurality of pressing components includes a first compression spring and a lower pressing plate. The first compression spring is fixed in the middle of the inner wall of the lower pressing plate, and the top of the first compression spring is fixedly connected to the top of the fixing tube.

[0015] Preferably, the moving component includes:

[0016] A clamping block is slidably connected to the inner cavity of the fixing tube, and both the pulling component and the rotating mechanism are arranged at one end of the clamping block;

[0017] A plurality of clamping grooves are respectively formed on both sides of the upper surface of the clamping block. The chamfered groove is formed at one end of the clamping block. The connecting groove is formed between two adjacent clamping grooves. The pull rope is fixed to the other end of the clamping block, and the connecting component is arranged in the inner cavity of the clamping groove.

[0018] Preferably, the connecting component includes:

[0019] A connecting block and a pressing plate. The connecting block is fixed to one end of the pressing plate;

[0020] A plurality of convex blocks are respectively formed on the bottom of the pressing plate. The pressing plate is movably clamped in the inner cavity of the clamping groove.

[0021] Preferably, the pulling component includes:

[0022] Push rods. A plurality of the push rods are respectively fixed to both sides of one end of the clamping block;

[0023] Second compression springs are sleeved on the outer walls of the push rods, and one end of each of the plurality of second compression springs is provided with the same rotating mechanism.

[0024] Preferably, the rotating mechanism includes:

[0025] An L-shaped plate, the L-shaped plate is fixed to one end of the inner wall of the sensor body, and the moving component is slidably connected to the inner side of the L-shaped plate in a horizontal direction;

[0026] A gear, the gear is rotatably inserted through the top of the L-shaped plate;

[0027] A rotating rod, the rotating rod is fixedly inserted through the middle of the gear;

[0028] A plurality of sliding components, the plurality of sliding components are respectively arranged on both sides of the top of the L-shaped plate;

[0029] A rack, the rack is fixed to the top of one end of the block.

[0030] Preferably, one end of the rotating rod is slidably inserted through one side of the sensor body in a vertical direction, the gear is meshed with the bottom of the rack, and the rack is used for horizontally pushing the moving component.

[0031] Preferably, the sliding component includes:

[0032] Chute, a plurality of the chutes are respectively arranged on both sides of the top of the L-shaped plate;

[0033] A third compression spring, the third compression spring is fixedly connected to the bottom of the inner wall of the chute;

[0034] A slider, the slider is slidably inserted through the inner cavity of the chute in a vertical direction, and the top end of the third compression spring is fixedly connected to the bottom of the slider;

[0035] A positioning rod, the bottom end of the positioning rod is fixedly connected to the bottom end of the inner wall of the chute.

[0036] Preferably, the positioning rod is slidably inserted through the bottom of the slider, and both ends of the rotating rod are respectively rotatably inserted through the tops of a plurality of sliders through bearings.

[0037] The present invention also provides a method for using a low-voltage voltage sensor, including the following specific use steps:

[0038] Step 1: Rotate the rotating rod to make the gear rotate, so that the rack meshed with the gear can slide, so that the moving component can horizontally move in the inner cavity of the fixed tube, so that the second compression spring can be compressed, and the moving component can extend out of the inner cavity of the fixed tube;

[0039] Step 2: Snap the pressure plate into the inner cavity of the corresponding card slot, press down on the rotating rod, so that the slider is pressed down in the inner cavity of the chute, so that the third compression spring is compressed, and the gear moves down on the top of the L-shaped plate, so that the gear disengages from the bottom of the rack, and the elastic compression of the second compression spring is released;

[0040] Step 3: Through the elastic pushing of the second compression spring, the push rod pulls the moving component, enabling the moving component to be pulled. The rack can drive the moving component to extend into the inner cavity of the fixed tube, allowing the pressing component to slide on the upper surface of the pressing plate, and making the pressing plate fit tightly against the inner wall of the card slot.

[0041] Technical effects and advantages of the present invention:

[0042] (1) The present invention utilizes the cooperation of a fixing mechanism, a clamping mechanism, and a connecting mechanism. By changing the terminal connected to the sensor to a connecting component, the connecting component can be engaged with the clamping mechanism, facilitating the connection between the external terminal and the sensor body. Moreover, through the setting of the fixing mechanism, the connection between the clamping mechanism and the connecting mechanism is more stable, reducing the disconnection phenomenon between the terminal and the sensor body, and improving the stability of the low-voltage voltage sensor during use;

[0043] (2) The present invention utilizes the cooperation of a pulling component and a rotating mechanism. Through the pulling component, it is convenient to elastically pull the moving component, enabling the moving component to be retracted into the inner cavity of the fixing mechanism without external force. And through the setting of the rotating mechanism, it is convenient to push the moving component out of the inner cavity of the moving component, facilitating the improvement of the convenience of the connection between the connecting component and the clamping mechanism. Description of the Drawings

[0044] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0045] Figure 2 is a schematic diagram of the overall front sectional structure of the present invention.

[0046] Figure 3 is a schematic diagram of the overall structure at the L-shaped plate of the present invention.

[0047] Figure 4 of the present invention Figure 1 is a partially enlarged schematic diagram of part A in the present invention.

[0048] Figure 5 is a schematic diagram of the overall sectional structure of the fixing tube of the present invention from above.

[0049] Figure 6 of the present invention Figure 2 is a partially enlarged schematic diagram of part B in the present invention.

[0050] Figure 7 of the present invention Figure 6 is a partially enlarged schematic diagram of part C in the present invention.

[0051] In the figure: 1. Sensor body; 2. Fixing mechanism; 21. Fixing tube; 22. Waterproof groove; 23. Drain hole; 24. Pressing-down component; 241. First compression spring; 242. Lower pressing plate; 3. Clamping mechanism; 31. Moving component; 311. Clamping block; 312. Clamping groove; 32. Chamfered groove; 33. Connecting groove; 34. Pulling rope; 4. Connecting component; 41. Connecting block; 42. Pressing plate; 43. Protrusion; 5. Pulling component; 51. Push-pull rod; 52. Second compression spring; 6. Rotating mechanism; 61. L-shaped plate; 62. Gear; 63. Rotating rod; 64. Sliding component; 641. Sliding groove; 642. Third compression spring; 643. Slider; 644. Positioning rod; 65. Rack. Detailed implementation manner

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0053] The present invention provides a low-voltage voltage sensor as shown in Figure 1-7 One end of the sensor body 1 is provided with a fixing mechanism 2. The fixing mechanism 2 includes a fixing tube 21, a waterproof groove 22, a drain hole 23 and a plurality of pressing-down components 24. The fixing tube 21 is fixedly inserted and connected to one end of the sensor body 1. The waterproof groove 22 is opened at one end of the inner wall of the fixing tube 21. The waterproof groove 22 is a quadrilateral groove structure, and the inner cavity of the waterproof groove 22 is an inward concave arc structure. The drain hole 23 is opened at the bottom of the inner wall of the waterproof groove 22, which is convenient for rainwater to drain from the inner cavity of the drain hole 23 through the waterproof groove 22 when the low-voltage voltage sensor is used outdoors. The plurality of pressing-down components 24 include a first compression spring 241 and a lower pressing plate 242. The plurality of pressing-down components 24 are two pressing-down components 24. The first compression spring 241 is fixed in the middle of the inner wall of the lower pressing plate 242, and the top of the first compression spring 241 is fixedly connected to the top of the fixing tube 21. Through the elasticity of the first compression spring 241, it is convenient to elastically push the lower pressing plate 242;

[0054] Further, a clamping mechanism 3 is arranged in the inner cavity of the fixing mechanism 2. The clamping mechanism 3 includes: a moving component 31, a chamfered groove 32, a connecting groove 33 and a pulling rope 34. The moving component 31 slides in the inner cavity of the fixing mechanism 2. The moving component 31 horizontally slides in the inner cavity of the fixing tube 21. The moving component 31 includes: a clamping block 311 and a plurality of clamping grooves 312. The clamping block 311 is slidably connected to the inner cavity of the fixing tube 21. The plurality of clamping grooves 312 are respectively opened on both sides of the upper surface of the clamping block 311. The clamping grooves 312 are in a continuous wave groove structure. An energized elastic sheet connected to the sensor main body 1 is fixedly inserted into the inner cavity of the clamping groove 312.

[0055] Specifically, the chamfered groove 32 is opened at one end of the moving component 31. The chamfered groove 32 is in a structure of two arc grooves. The chamfered groove 32 is opened on both sides of one end of the clamping block 311. The connecting groove 33 is opened in the middle of the moving component 31. The pulling rope 34 is fixed to the other end of the moving component 31. The chamfered groove 32 is opened at one end of the clamping block 311. The connecting groove 33 is opened between two adjacent clamping grooves 312. The pulling rope 34 is fixed to the other end of the clamping block 311. Through the pulling rope 34, it is convenient to stably pull the clamping block 311 so that the clamping block 311 can be retracted into the inner cavity of the fixing tube 21, which is convenient for hiding the clamping block 311.

[0056] Further, connecting components 4 are respectively clamped on both sides of the moving component 31. The connecting components 4 are arranged in the inner cavity of the clamping groove 312. The connecting components 4 include: a connecting block 41, a pressing plate 42 and a plurality of convex blocks 43. The connecting block 41 is fixed to one end of the pressing plate 42. A terminal wire is fixedly inserted into the inner cavity of the connecting block 41. The plurality of convex blocks 43 are respectively opened at the bottom of the pressing plate 42. The pressing plate 42 is movably clamped in the inner cavity of the clamping groove 312. A wiring terminal is fixedly inserted into the inner cavity of the pressing plate 42. The wiring terminal is fixedly inserted into the protruding parts of the plurality of convex blocks 43. The wiring terminal can be in contact with the energized elastic sheet for energization, which is used for the electrical connection of the low-voltage voltage sensor.

[0057] Further, pulling components 5 are arranged on both sides of one end of the moving component 31. The pulling components 5 include: push rods 51 and second compression springs 52. The plurality of push rods 51 are respectively fixed to both sides of one end of the clamping block 311. The second compression springs 52 are sleeved on the outer walls of the push rods 51, and the second compression springs 52 are fixedly connected to one ends of the push rods 51, which is convenient for the second compression springs 52 to be stable on the outer walls of the push rods 51.

[0058] Further, a rotating mechanism 6 for horizontally pushing the moving component 31 is provided at one end of the moving component 31. The pulling component 5 and the rotating mechanism 6 are both provided at one end of the clamping block 311. The same rotating mechanism 6 is provided at one end of multiple second compression springs 52. The rotating mechanism 6 includes: an L-shaped plate 61, a gear 62, a rotating rod 63, multiple sliding components 64, and a rack 65. The L-shaped plate 61 is fixed to one end of the inner wall of the sensor body 1. The push-pull rod 51 is slidably inserted through the middle of the L-shaped plate 61. The moving component 31 is slidably connected to the inner side of the L-shaped plate 61 in the horizontal direction. The gear 62 is rotatably inserted through the top of the L-shaped plate 61. The rotating rod 63 is fixedly inserted through the middle of the gear 62. The multiple sliding components 64 are two sliding components 64, and the two sliding components 64 are respectively provided on both sides of the top of the L-shaped plate 61. The rack 65 is fixed to the top of one end of the clamping block 311. One end of the rotating rod 63 is slidably inserted through one side of the sensor body 1 in the vertical direction. The gear 62 is meshed with the bottom of the rack 65. The rack 65 is used for horizontally pushing the moving component 31. Press down the rotating rod 63 so that the gear 62 can be offset below the inner cavity of the bottom tooth groove of the rack 65, so that the gear 62 does not affect the sliding of the rack 65;

[0059] Specifically, the sliding component 64 includes: a chute 641, a third compression spring 642, a slider 643, and a positioning rod 644. The multiple chutes 641 are two chutes 641, and the two chutes 641 are respectively provided on both sides of the top of the L-shaped plate 61. The third compression spring 642 is fixedly connected to the bottom of the inner wall of the chute 641. The slider 643 is slidably inserted through the inner cavity of the chute 641 in the vertical direction. The top end of the third compression spring 642 is fixedly connected to the bottom of the slider 643. The bottom end of the positioning rod 644 is fixedly connected to the bottom end of the inner wall of the chute 641. The positioning rod 644 is slidably inserted through the bottom of the slider 643. Through the positioning rod 644, it is convenient to improve the stability of the use of the third compression spring 642. Both ends of the rotating rod 63 are rotatably inserted through the tops of multiple sliders 643 through bearings. The rotating rod 63 is slidably inserted through the inner cavities of two adjacent chutes 641. Press down the rotating rod 63 so that the slider 643 can be pressed down, so that the third compression spring 642 can be compressed, so that the gear 62 can slide downward on the top of the L-shaped plate 61. And through the elasticity of the third compression spring 642, the gear 62 can be meshed with the rack 65, which is convenient for the meshing and sliding of the rack 65, so that the clamping block 311 can be pushed out of the inner cavity of the fixed tube 21, which is convenient for the connection between the upper terminal of the sensor and the external terminal, and improves the stability of the use of the sensor.

[0060] Usage method of the present invention:

[0061] When it is necessary to electrically connect the low-voltage voltage sensor, rotate the rotating rod 63 to rotate its gear 62, so that the rack 65 meshing with the gear 62 can slide, so that the latch 311 on the moving component 31 can horizontally move in the inner cavity of the fixed tube 21, so that the second compression spring 52 can be compressed, so that the latch 311 can extend out of the inner cavity of the fixed tube 21, and snap the pressure plate 42 provided with the connection terminal into the inner cavity of the corresponding card slot 312, so that the wiring terminal on the pressure plate 42 is in contact with the metal elastic sheet of the card slot 312, improving the stability of the connection between the terminal and the inner cavity of the card slot 312;

[0062] Press down the rotating rod 63 to press down the slider 643 in the inner cavity of the chute 641, so that the third compression spring 642 is compressed, and the gear 62 moves downward on the top of the L-shaped plate 61, so that the gear 62 disengages from the bottom of the rack 65, facilitating the release of the position limitation of the rack 65, releasing the elastic compression of the second compression spring 52. Through the elastic recovery of the second compression spring 52, the second compression spring 52 can push the push rod 51, so that the push rod 51 pulls the latch 311, so that the latch 311 can be pulled, and the rack 65 can drive the moving component 31 to extend into the inner cavity of the fixed tube 21, so that the pressing component 24 can slide on the upper surface of the pressure plate 42, so that the pressure plate 42 is in close contact with the inner wall of the card slot 312, so that the wiring terminal can be stably received in the inner cavity of the fixed tube 21.

[0063] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low voltage sensor, comprising: The sensor body (1) is characterized in that a fixing mechanism (2) is provided at one end of the sensor body (1), a clamping mechanism (3) is provided in the inner cavity of the fixing mechanism (2), and the clamping mechanism (3) comprises: A moving component (31), the moving component (31) slides in the inner cavity of the fixing mechanism (2), the two sides of the moving component (31) are respectively clamped with connecting components (4), the two sides of one end of the moving component (31) are provided with pulling components (5), and one end of the moving component (31) is provided with a rotating mechanism (6) for horizontally pushing the moving component (31); A chamfered groove (32), wherein the chamfered groove (32) is formed at one end of the moving component (31); A connecting groove (33), wherein the connecting groove (33) is provided in the middle of the moving component (31); A pull rope (34), wherein the pull rope (34) is fixed to the other end of the moving component (31).

2. A low voltage sensor according to claim 1, characterized in that: The fixing mechanism (2) comprises: A fixed tube (21), the fixed tube (21) being fixedly connected to one end of the sensor body (1) by insertion, and the moving component (31) sliding horizontally in the inner cavity of the fixed tube (21); A waterproof groove (22), wherein the waterproof groove (22) is provided at one end of the inner wall of the fixed tube (21); A water discharge hole (23), wherein the water discharge hole (23) is provided at the bottom of the inner wall of the waterproof groove (22); A plurality of downward pressing assemblies (24), wherein the plurality of downward pressing assemblies (24) comprise a first compression spring (241) and a downward pressing plate (242), wherein the first compression spring (241) is fixed to the middle portion of the inner wall of the downward pressing plate (242), and the top of the first compression spring (241) is fixedly connected to the top of the fixed tube (21).

3. A low voltage sensor according to claim 2, characterized in that: The moving component (31) comprises: A clamping block (311), the clamping block (311) being slidably connected to the inner cavity of the fixed tube (21), and the pulling assembly (5) and the rotating mechanism (6) are both arranged at one end of the clamping block (311); A plurality of card slots (312) are respectively provided on two sides of the upper surface of the card block (311); the chamfered groove (32) is provided at one end of the card block (311); the connecting groove (33) is provided between two adjacent card slots (312); the pull rope (34) is fixed to the other end of the card block (311); and the connecting component (4) is arranged in the inner cavity of the card slot (312).

4. A low voltage sensor according to claim 3, characterized in that: The connection component (4) comprises: A connecting block (41) and a pressing plate (42), wherein the connecting block (41) is fixed to one end of the pressing plate (42); A plurality of protrusions (43) are respectively arranged at the bottom of the pressing plate (42), and the pressing plate (42) is movably engaged with the inner cavity of the clamping slot (312).

5. A low voltage sensor according to claim 4, characterized in that: The pulling assembly (5) comprises: Push-pull rods (51), wherein a plurality of push-pull rods (51) are respectively fixed on two sides of one end of the clamping block (311); A second compression spring (52), wherein the second compression spring (52) is sleeved on the outer wall of the push-pull rod (51), and one end of a plurality of the second compression springs (52) is provided with a same rotating mechanism (6).

6. A low voltage sensor according to claim 5, characterized in that: The rotating mechanism (6) comprises: An L-shaped plate (61), the L-shaped plate (61) being fixed to one end of the inner wall of the sensor body (1), the moving component (31) being slidably connected to the inner side of the L-shaped plate (61) in a horizontal direction; A gear (62), the gear (62) rotatably inserted into the top of the L-shaped plate (61); A rotating rod (63), the rotating rod (63) being fixedly interlaced with the middle portion of the gear (62); A plurality of sliding components (64), wherein the plurality of sliding components (64) are respectively arranged on both sides of the top of the L-shaped plate (61); A rack (65), wherein the rack (65) is fixed to the top of one end of the clamping block (311).

7. A low voltage sensor according to claim 6, characterized in that: One end of the rotating rod (63) is slidably connected to one side of the sensor body (1) in a vertical direction, and the gear (62) is meshed with the bottom of the rack (65), and the rack (65) is used to push the moving component (31) horizontally.

8. A low voltage sensor according to claim 7, characterized in that: The sliding assembly (64) comprises: A plurality of slide grooves (641), wherein the plurality of slide grooves (641) are respectively arranged on two sides of the top of the L-shaped plate (61); A third compression spring (642), wherein the third compression spring (642) is fixedly connected to the bottom of the inner wall of the slide groove (641); A slider (643), wherein the slider (643) is slidably connected with the inner cavity of the slide groove (641) in a vertical direction, and the top of the third compression spring (642) is fixedly connected with the bottom of the slider (643); A positioning rod (644), the bottom end of which is fixedly connected to the bottom end of the inner wall of the slide groove (641).

9. A low voltage sensor according to claim 8, characterized in that: The positioning rod (644) is slidably connected to the bottom of the slider (643), and the two ends of the rotating rod (63) are rotatably connected to the tops of the plurality of sliders (643) via bearings.

10. The method for using a low voltage sensor according to claim 9, characterized in that: The specific usage steps are as follows: Step 1: Rotate the rotating rod (63) to rotate the gear (62), so that the rack (65) meshing with the gear (62) can slide, so that the moving component (31) can move horizontally in the inner cavity of the fixed tube (21), so that the second compression spring (52) can be compressed, so that the moving component (31) can extend out of the inner cavity of the fixed tube (21); Step 2: Insert the pressure plate (42) into the inner cavity of the corresponding slot (312), press down the rotating rod (63), and make the slider (643) press down in the inner cavity of the slide slot (641), so that the third compression spring (642) is compressed, and the gear (62) moves down on the top of the L-shaped plate (61), so that the gear (62) is separated from the bottom of the rack (65), so that the elastic compression of the second compression spring (52) is released; Step three: through the elastic push of the second compression spring (52), the push-pull rod (51) pulls the movable component (31), so that the movable component (31) can be pulled, and the rack (65) can drive the movable component (31) to extend into the inner cavity of the fixed tube (21), so that the pressing component (24) can slide on the upper surface of the pressure plate (42), so that the pressure plate (42) and the inner wall of the slot (312) are tightly fitted.

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