Rock-soil gradient measuring device for geotechnical engineering investigation

Abstract

The utility model discloses a rock-soil gradient measuring device for geotechnical engineering investigation, which relates to the technical field of rock-soil gradient measurement and comprises a device outer shell, a movable plate, a movable plate driving unit, a gradient measuring unit and a bubble level. And the movable plate driving unit comprises a mounting plate, a vertical screw rod, an adjusting moving block, an inclined rotating rod and an adjusting knob. By arranging the movable plate driving unit, the device outer shell can rotate relative to the movable plate by rotating the adjusting knob, so that the rotating process of the device outer shell can be finely controlled, the device outer shell is rotated to a horizontal state, gradient measurement is achieved, and the gradient measuring device has the advantages of being simple and accurate in gradient measurement control and high in practicability. Therefore, the gradient measurement efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rock and soil slope measurement, in particular to a rock and soil slope measurement device for geotechnical engineering investigation. Background Art

[0002] Geotechnical engineering investigation includes three stages: feasibility study investigation, preliminary investigation and detailed investigation. The key work in the feasibility study investigation stage is to collect geological, topographic and geomorphological data in the investigation area and engineering geological data in nearby areas, and then to understand the engineering geological conditions of the site such as strata, structure, rock, etc. through field investigation on the basis of collecting and analyzing the existing data. In the process of geotechnical engineering investigation, it is usually necessary to use a slope measuring device to measure the rock and soil slope.

[0003] The patent with publication number CN220206678U in the prior art discloses a geotechnical slope measuring device for geotechnical engineering investigation. The movable block rotates with the first fixed column as the fulcrum, so that the other end of the movable block is away from the measuring instrument housing, driving the rack to move, thereby causing the gear meshing with the rack to rotate, driving the dial to rotate synchronously. By observing the rotation angle of the dial, the angle of the geotechnical slope can be known. The measurement is fast and convenient, saving time and improving work efficiency. However, during the measurement process, the staff needs to manually rotate the measuring instrument housing, and the rotation process of the measuring instrument housing is not precise, and it is difficult to accurately rotate the measuring instrument housing to a horizontal position, thereby increasing the difficulty of slope measurement and reducing the efficiency of slope measurement. Utility Model Content

[0004] The purpose of this application is to provide a rock and soil slope measuring device for geotechnical engineering investigation to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] The utility model provides a rock and soil slope measuring device for geotechnical engineering investigation, comprising a device outer shell (1), a movable plate (2), a movable plate driving unit, a slope measuring unit and a bubble level (13);

[0007] The movable plate (2) is rotatably connected to the inner wall of the bottom of the outer shell (1) of the device, and the cavity of the outer shell (1) of the device is respectively provided with the movable plate driving unit and the slope measuring unit;

[0008] Wherein, the movable plate driving unit comprises a mounting plate (3), a vertical screw rod (4), an adjusting block (5), a tilting rotating rod (6) and an adjusting knob (7); the mounting plate (3) is fixedly mounted on the inner wall of the side of the outer shell (1) of the device; the vertical screw rod (4) is rotatably mounted on the top of the mounting plate (3), the top end of the vertical screw rod (4) extends to the outside of the outer shell (1) of the device and is fixedly mounted on the adjusting knob (7); the main body of the vertical screw rod (4) is threadedly sleeved with the adjusting block (5), the side of the adjusting block (5) is rotatably connected to the top end of the tilting rotating rod (6), and the bottom end of the tilting rotating rod (6) is rotatably mounted on the top of the movable plate (2);

[0009] The slope measuring unit comprises a fixed sleeve (8), an indicating shaft (9), a rope drum (10), a connecting rope (11), an indicating needle (12) and an elastic tensioning element; the fixed sleeve (8) is fixedly mounted on the inner wall of the side of the outer shell (1) of the device, the indicating shaft (9) is rotatably sleeved in the fixed sleeve (8), and an elastic tensioning element for automatically reversing the indicating shaft (9) is arranged in the fixed sleeve (8); the rope drum (10) is fixedly sleeved on the indicating shaft (9), the connecting rope (11) is wound and mounted on the rope drum (10), and the bottom end of the connecting rope (11) is fixedly mounted on the top of the movable plate (2); one end of the indicating shaft (9) extends to the outside of the outer shell (1) of the device and is fixedly mounted on the indicating needle (12), and the side of the outer shell (1) of the device is provided with scale patterns matching the indicating needle (12);

[0010] The bubble level (13) is fixedly mounted on the side of the device outer shell (1).

[0011] Preferably, the elastic tensioning element comprises a tensioning torsion spring (14) sleeved on the indicating rotating shaft (9), and two ends of the tensioning torsion spring (14) are respectively fixedly mounted on the inner wall of the fixing sleeve (8) and the outer wall of the indicating rotating shaft (9).

[0012] Preferably, the movable plate driving unit further comprises a vertical guide rod (15) and a guide block (23);

[0013] The two vertical guide rods (15) are fixedly mounted on the top of the mounting plate (3), the guide blocks (23) are slidably sleeved on the two vertical guide rods (15), and the two guide blocks (23) are fixedly mounted on the sides of the adjusting and shifting blocks (5).

[0014] Preferably, a T-shaped slide groove is provided on the side of the movable plate (2), a T-shaped slide bar (16) is slidably installed in the T-shaped slide groove, a plurality of ground nails (17) are evenly fixedly installed at the bottom of the T-shaped slide bar (16), and a plurality of fastening elements for fixing the T-shaped slide bar (16) are provided on the movable plate (2).

[0015] Preferably, the fastening element includes a fastening bolt (18); a bolt through hole connected to the T-shaped slide groove is opened on the top of the movable plate (2), and a fastening screw hole is opened on the top of the T-shaped slide bar (16); the bottom end of the fastening bolt (18) passes through the bolt through hole and is threadedly installed in the fastening screw hole.

[0016] Preferably, a fixed protrusion (19) is fixedly installed on the top of the outer shell (1) of the device, a horizontal sliding hole is opened on the side of the fixed protrusion (19), a fixed plug rod (20) is slidably installed in the horizontal sliding hole, a plurality of fixed plug holes (24) are evenly opened on the circumferential side of the adjustment knob (7), one end of the fixed plug rod (20) extends into one of the fixed plug holes (24), and a control pull block (21) is fixedly installed on the other end of the fixed plug rod (20), and a reset unit is installed on the fixed plug rod (20).

[0017] Preferably, the reset unit comprises a protrusion (25) fixedly sleeved on the fixed plug rod (20), and a reset spring (22) is sleeved on the fixed plug rod (20), and two ends of the reset spring (22) are respectively fixedly mounted on the sides of the fixed protrusion (19) and the protrusion (25).

[0018] The utility model provides a rock and soil slope measuring device for geotechnical engineering investigation, which has the following advantages:

[0019] 1. The utility model has a reasonable structure. The movable plate can be fixed on the rock and soil slope by ground nails. When the adjusting knob is turned, the movable plate will be driven to tilt and rotate away from or close to the outer shell of the device through the vertical screw, the adjusting block, and the tilting rod. Under the cooperation of the fixed sleeve and the tensioning torsion spring, the tilting and rotating of the movable plate will drive the indicator needle to rotate through the connecting pull rope, the rope reel, and the indicating shaft until the bubble level is in a horizontal state. At this time, the position of the scale line pointed by the indicator needle can be directly observed to obtain the angle of the rock and soil slope. The utility model provides a rock and soil slope measuring device for geotechnical engineering survey. After the movable plate is fixed to the slope to be measured, the movable plate driving unit is set, and the outer shell of the device can be rotated relative to the movable plate by rotating the adjusting knob, so that the rotation process of the outer shell of the device can be finely controlled, so that the outer shell of the device is turned to a horizontal state to achieve slope measurement. It has the advantages of simple and accurate slope measurement control, thereby improving the efficiency of slope measurement. In addition, when reading and recording the measurement data after the measurement is completed, the staff no longer needs to hold the device all the time. The operation is simple, easy to use and practical.

[0020] 2. In the utility model, when the control pull block is pulled, the fixed plug rod will be driven to move out of the fixed plug hole, and the adjusting knob will be loosened. When the control pull block is loosened, the fixed plug rod will be automatically reset and inserted into the fixed plug hole through the convex piece under the elastic force of the reset spring, and the adjusting knob will be fixed all the time, so that the measurement result changes caused by accidentally touching the adjusting knob can be effectively reduced during use, and the stability during use is better;

[0021] 3. In the utility model, through the coordinated arrangement of the T-shaped slide bar, the fastening bolts and the fastening screw holes, when the fastening bolts are rotated, the T-shaped slide bar can be fixed or loosened with the cooperation of the fastening screw holes, thereby achieving the purpose of facilitating the disassembly, assembly and replacement of the T-shaped slide bar and the ground nails, and having better practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of the present application;

[0024] Figure 2 It is a schematic diagram of a partial cross-section structure of the outer shell of the device in the embodiment of the present application;

[0025] Figure 3This is a partially enlarged structural diagram of the connection between the adjusting knob and the fixed plug rod in the embodiment of the present application;

[0026] Figure 4 It is a schematic diagram of the front cross-sectional structure of the fixed sleeve in the embodiment of the present application.

[0027] In the figure: 1. device outer shell; 2. movable plate; 3. mounting plate; 4. vertical screw; 5. adjustment shift block; 6. tilting rod; 7. adjustment knob; 8. fixing sleeve; 9. indicating shaft; 10. rope winding drum; 11. connecting pull rope; 12. indicating needle; 13. bubble level; 14. tensioning torsion spring; 15. vertical guide rod; 16. T-shaped slide bar; 17. ground nail; 18. fastening bolt; 19. fixing protrusion; 20. fixing plug rod; 21. control pull block; 22. reset spring; 23. guide block; 24. fixing socket; 25. protrusion. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] refer to Figure 1-Figure 4 As shown, the utility model provides a rock and soil slope measuring device for geotechnical engineering investigation, comprising a device outer shell 1, a movable plate 2, a movable plate driving unit, a slope measuring unit and a bubble level 13;

[0030] The bottom inner wall of the device outer shell 1 is rotatably connected to the movable plate 2, and the cavity of the device outer shell 1 is respectively provided with a movable plate driving unit and a slope measuring unit;

[0031] The movable plate driving unit includes a mounting plate 3, a vertical screw rod 4, an adjustment block 5, a tilting rotating rod 6 and an adjustment knob 7; the mounting plate 3 is fixedly mounted on the inner wall of the side of the device outer shell 1; the vertical screw rod 4 is rotatably mounted on the top of the mounting plate 3, the top of the vertical screw rod 4 extends to the outside of the device outer shell 1 and is fixedly mounted on the adjustment knob 7; the main body of the vertical screw rod 4 is threadedly sleeved with the adjustment block 5, the side of the adjustment block 5 is rotatably connected to the top of the tilting rotating rod 6, and the bottom end of the tilting rotating rod 6 is rotatably mounted on the top of the movable plate 2;

[0032] The slope measuring unit comprises a fixed sleeve 8, an indicating shaft 9, a rope drum 10, a connecting pull rope 11, an indicating needle 12 and an elastic tensioning element; the fixed sleeve 8 is fixedly installed on the inner wall of the side of the device outer shell 1, the indicating shaft 9 is rotatably sleeved in the fixed sleeve 8, and an elastic tensioning element for automatically reversing the indicating shaft 9 is arranged in the fixed sleeve 8; the rope drum 10 is fixedly sleeved on the indicating shaft 9, the connecting pull rope 11 is wound and installed on the rope drum 10, and the bottom end of the connecting pull rope 11 is fixedly installed on the top of the movable plate 2; one end of the indicating shaft 9 extends to the outside of the device outer shell 1 and is fixedly installed with the indicating needle 12, and the side of the device outer shell 1 is provided with scale patterns adapted to the indicating needle 12;

[0033] A bubble level 13 is fixed on the side of the device housing 1.

[0034] An elastic tensioning element for automatically reversing the indicating shaft 9 is arranged in the fixed sleeve 8, and the elastic tensioning element includes a tensioning torsion spring 14 sleeved on the indicating shaft 9, and the two ends of the tensioning torsion spring 14 are respectively fixedly mounted on the inner wall of the fixed sleeve 8 and the outer wall of the indicating shaft 9. A T-shaped slide groove is opened on the side of the movable plate 2, and a T-shaped slide bar 16 is slidably installed in the T-shaped slide groove. A plurality of ground nails 17 are evenly fixedly installed on the bottom of the T-shaped slide bar 16, and a plurality of fastening elements for fixing the T-shaped slide bar 16 are arranged on the movable plate 2.

[0035] By means of the above structure, when in use, the movable plate 2 can be fixed on the rock slope by the ground nails 17, and then the adjusting knob 7 is rotated. The rotation of the adjusting knob 7 will drive the adjusting block 5 to move up and down through the vertical screw 4. The up and down movement of the adjusting block 5 will drive the tilting rod 6 to tilt and rotate, and then the movable plate 2 can be driven to tilt and rotate together away from or close to the outer shell 1 of the device. At this time, with the cooperation of the fixed sleeve 8 and the tensioning torsion spring 14, the tilting rotation of the movable plate 2 will drive the indicator needle 12 to rotate through the connecting pull rope 11, the rope drum 10, and the indicating shaft 9 until the bubble level 13 is in a horizontal state. At this time, the position of the scale line pointed by the indicator needle 12 can be directly observed to obtain the angle of the rock slope. The utility model provides a geotechnical slope measuring device for geotechnical engineering investigation. When the movable plate 2 is fixed to the slope to be measured, the movable plate driving unit is set, and the outer shell 1 of the device can be rotated relative to the movable plate 2 by rotating the adjustment knob 7, so that the rotation process of the outer shell 1 of the device can be finely controlled, so that the outer shell 1 of the device is turned to a horizontal state to achieve slope measurement. The utility model has the advantages of simple and accurate slope measurement control, thereby improving the efficiency of slope measurement. In addition, when reading and recording the measurement data after the measurement is completed, the staff no longer needs to hold the device all the time, and the operation is simple, easy to use, and practical.

[0036] In this embodiment, the movable plate driving unit further includes a vertical guide rod 15 and a guide block 23;

[0037] Two vertical guide rods 15 are fixedly installed on the top of the mounting plate 3, and the guide blocks 23 are slidably sleeved on the two vertical guide rods 15, and the two guide blocks 23 are fixedly installed on the side of the adjustment block 5. The advantage of this arrangement is that, through the coordinated arrangement of the vertical guide rods 15 and the guide blocks 23, the adjustment block 5 can only move vertically up and down, and will not rotate with the vertical screw rod 4, and has good stability during use.

[0038] In practical applications, refer to Figure 1 As shown, the fastening element includes a fastening bolt 18, a bolt through hole connected to the T-shaped slide groove is provided at the top of the movable plate 2, a fastening screw hole is provided at the top of the T-shaped slide bar 16, and the bottom end of the fastening bolt 18 passes through the bolt through hole and is threadedly installed in the fastening screw hole. The advantage of such a setting is that, through the setting of the fastening bolt 18, when the fastening bolt 18 is rotated, the T-shaped slide bar 16 can be fixed or loosened with the cooperation of the fastening screw hole, thereby achieving the purpose of facilitating the disassembly, assembly and replacement of the T-shaped slide bar 16 and the ground nail 17, and having better practicality.

[0039] In practical applications, refer to Figure 1 and Figure 3 As shown, a fixed protrusion 19 is fixedly installed on the top of the outer shell 1 of the device, and a horizontal sliding hole is provided on the side of the fixed protrusion 19, and a fixed plug rod 20 is slidably installed in the horizontal sliding hole. A plurality of fixed plug holes 24 are evenly provided on the circumferential side of the adjusting knob 7, and one end of the fixed plug rod 20 extends into one of the fixed plug holes 24, and a control pull block 21 is fixedly installed on the other end of the fixed plug rod 20, and a reset unit is installed on the fixed plug rod 20. The advantage of such a setting is that when the control pull block 21 is moved left and right, the fixed plug rod 20 will be driven to move in or out of the fixed plug hole 24, and then the adjusting knob 7 can be fixed or loosened, so that during use, the situation that the measurement result changes due to accidentally touching the adjusting knob 7 can be effectively reduced, and the stability during use is better.

[0040] In this embodiment, the reset unit includes a protruding piece 25 fixedly sleeved on the fixed plug rod 20, and a reset spring 22 is sleeved on the fixed plug rod 20, and the two ends of the reset spring 22 are respectively fixedly mounted on the fixed protrusion 19 and the side of the protruding piece 25. The advantage of this arrangement is that when the control pull block 21 is released, the elastic force of the reset spring 22 will squeeze and push the protruding piece 25 to automatically reset, and then the fixed plug rod 20 can be automatically inserted into the fixed plug hole 24, and the adjustment knob 7 can be automatically fixed, and the fixed state can be maintained all the time, which is stable and reliable.

[0041] In summary, the rock and soil slope measuring device for geotechnical engineering investigation provided by the utility model has the following advantages:

[0042] 1. The utility model has a reasonable structure. The movable plate can be fixed on the rock and soil slope by ground nails. When the adjusting knob is turned, the movable plate will be driven to tilt and rotate away from or close to the outer shell of the device through the vertical screw, the adjusting block, and the tilting rod. Under the cooperation of the fixed sleeve and the tensioning torsion spring, the tilting and rotating of the movable plate will drive the indicator needle to rotate through the connecting pull rope, the rope reel, and the indicating shaft until the bubble level is in a horizontal state. At this time, the position of the scale line pointed by the indicator needle can be directly observed to obtain the angle of the rock and soil slope. The utility model provides a rock and soil slope measuring device for geotechnical engineering survey. After the movable plate is fixed to the slope to be measured, the movable plate driving unit is set, and the outer shell of the device can be rotated relative to the movable plate by rotating the adjusting knob, so that the rotation process of the outer shell of the device can be finely controlled, so that the outer shell of the device is turned to a horizontal state to achieve slope measurement. It has the advantages of simple and accurate slope measurement control, thereby improving the efficiency of slope measurement. In addition, when reading and recording the measurement data after the measurement is completed, the staff no longer needs to hold the device all the time. The operation is simple, easy to use and practical.

[0043] 2. In the utility model, when the control pull block is pulled, the fixed plug rod will be driven to move out of the fixed plug hole, and the adjusting knob will be loosened. When the control pull block is loosened, the fixed plug rod will be automatically reset and inserted into the fixed plug hole through the convex piece under the elastic force of the reset spring, and the adjusting knob will be fixed all the time, so that the measurement result changes caused by accidentally touching the adjusting knob can be effectively reduced during use, and the stability during use is better;

[0044] 3. In the utility model, through the coordinated arrangement of the T-shaped slide bar, the fastening bolts and the fastening screw holes, when the fastening bolts are rotated, the T-shaped slide bar can be fixed or loosened with the cooperation of the fastening screw holes, thereby achieving the purpose of facilitating the disassembly, assembly and replacement of the T-shaped slide bar and the ground nails, and having better practicality.

[0045] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or 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. A rock and soil slope measuring device for geotechnical engineering investigation, characterized in that: It comprises an outer shell of the device (1), a movable plate (2), a movable plate driving unit, a slope measuring unit and a bubble level (13); The movable plate (2) is rotatably connected to the inner wall of the bottom of the outer shell (1) of the device, and the cavity of the outer shell (1) of the device is respectively provided with the movable plate driving unit and the slope measuring unit; Wherein, the movable plate driving unit comprises a mounting plate (3), a vertical screw rod (4), an adjusting block (5), a tilting rotating rod (6) and an adjusting knob (7); the mounting plate (3) is fixedly mounted on the inner wall of the side of the outer shell (1) of the device; the vertical screw rod (4) is rotatably mounted on the top of the mounting plate (3), the top end of the vertical screw rod (4) extends to the outside of the outer shell (1) of the device and is fixedly mounted on the adjusting knob (7); the main body of the vertical screw rod (4) is threadedly sleeved with the adjusting block (5), the side of the adjusting block (5) is rotatably connected to the top end of the tilting rotating rod (6), and the bottom end of the tilting rotating rod (6) is rotatably mounted on the top of the movable plate (2); The slope measuring unit comprises a fixed sleeve (8), an indicating shaft (9), a rope drum (10), a connecting rope (11), an indicating needle (12) and an elastic tensioning element; the fixed sleeve (8) is fixedly mounted on the inner wall of the side of the outer shell (1) of the device, the indicating shaft (9) is rotatably sleeved in the fixed sleeve (8), and an elastic tensioning element for automatically reversing the indicating shaft (9) is arranged in the fixed sleeve (8); the rope drum (10) is fixedly sleeved on the indicating shaft (9), the connecting rope (11) is wound and mounted on the rope drum (10), and the bottom end of the connecting rope (11) is fixedly mounted on the top of the movable plate (2); one end of the indicating shaft (9) extends to the outside of the outer shell (1) of the device and is fixedly mounted on the indicating needle (12), and the side of the outer shell (1) of the device is provided with scale patterns matching the indicating needle (12); The bubble level (13) is fixedly mounted on the side of the device outer shell (1).

2. A rock and soil slope measuring device for geotechnical engineering investigation according to claim 1, characterized in that: The elastic tensioning element comprises a tensioning torsion spring (14) sleeved on the indicating rotating shaft (9), and two ends of the tensioning torsion spring (14) are respectively fixedly mounted on the inner wall of the fixing sleeve (8) and the outer wall of the indicating rotating shaft (9).

3. The device for measuring the slope of a rock or soil used in geotechnical engineering survey according to claim 1, characterized in that: The movable plate driving unit further comprises a vertical guide rod (15) and a guide block (23); The two vertical guide rods (15) are fixedly mounted on the top of the mounting plate (3), the guide blocks (23) are slidably sleeved on the two vertical guide rods (15), and the two guide blocks (23) are fixedly mounted on the sides of the adjusting and shifting blocks (5).

4. The device for measuring the slope of a rock or soil used in geotechnical engineering survey according to claim 1, characterized in that: A T-shaped slide groove is provided on the side of the movable plate (2), a T-shaped slide bar (16) is slidably installed in the T-shaped slide groove, a plurality of ground nails (17) are evenly fixedly installed at the bottom of the T-shaped slide bar (16), and a plurality of fastening elements for fixing the T-shaped slide bar (16) are arranged on the movable plate (2).

5. A rock and soil slope measuring device for geotechnical engineering investigation according to claim 4, characterized in that: The fastening element comprises a fastening bolt (18); a bolt through hole connected to the T-shaped slide groove is formed at the top of the movable plate (2); a fastening screw hole is formed at the top of the T-shaped slide bar (16); the bottom end of the fastening bolt (18) passes through the bolt through hole and is threadedly installed in the fastening screw hole.

6. The device for measuring the slope of a rock or soil used in geotechnical engineering survey according to claim 1, characterized in that: A fixed protrusion (19) is fixedly installed on the top of the outer shell (1) of the device, a horizontal sliding hole is opened on the side of the fixed protrusion (19), a fixed plug rod (20) is slidably installed in the horizontal sliding hole, a plurality of fixed plug holes (24) are evenly opened on the circumferential side of the adjustment knob (7), one end of the fixed plug rod (20) extends into one of the fixed plug holes (24), and a control pull block (21) is fixedly installed on the other end of the fixed plug rod (20), and a reset unit is installed on the fixed plug rod (20).

7. A rock and soil slope measuring device for geotechnical engineering investigation according to claim 6, characterized in that: The reset unit comprises a protruding piece (25) fixedly sleeved on the fixed plug rod (20), a reset spring (22) sleeved on the fixed plug rod (20), and two ends of the reset spring (22) are respectively fixedly mounted on the fixed protrusion (19) and the side of the protruding piece (25).

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