A safety protection type grounding switch device

Abstract

The present invention discloses a safety protection type grounding switch device, comprising: a base; a static contact mechanism, the static contact mechanism having a plurality of static contact mechanisms, and the plurality of static contact mechanisms are arranged at intervals on the base; a moving contact mechanism, the number of the moving contact mechanisms is equal to that of the static contact mechanisms and the positions are corresponding; the static contact mechanism comprises a first metal strip, and the moving contact mechanism comprises a second metal strip and a metal connecting piece; an action component, the action component drives all the moving contact mechanisms to rotate, and the action component is also used to squeeze the first metal strip; wherein the static contact mechanism comprises two insulators, and the two insulators are respectively provided with connecting seats; the present invention increases the contact area between the moving contact mechanism and the static contact mechanism, improves the opening and closing speed, and ensures safety and reliability.

Description

Technical Field

[0001] The invention relates to the technical field of electrical equipment, and in particular to a safety protection type grounding switch device. Background Art

[0002] The grounding switch can be used for grounding protection during the maintenance of high-voltage electrical equipment, and it plays an important role in the electrical system. However, the opening and closing speed of the existing grounding switch is slow, which leads to reduced reliability and safety. In addition, the contact effect between the moving contact and the static contact of the existing grounding switch is general, which also reduces the performance and reliability. Summary of the invention

[0003] The object of the present invention is to provide a safety protection type grounding switch device, which has the advantages of good contact effect, fast opening and closing speed, etc., and can effectively improve safety and reliability.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: A safety protection type grounding switch device, comprising: a base; a static contact mechanism, the static contact mechanism having a plurality of static contact mechanisms, and the plurality of static contact mechanisms are arranged on the base at intervals; a moving contact mechanism, the number of the moving contact mechanisms is equal to that of the static contact mechanisms and the positions are corresponding; an action component, the action component drives all the moving contact mechanisms to rotate, and the action component is also used to squeeze a first metal strip; wherein the static contact mechanism comprises two insulators, and the two insulators are respectively provided with connecting seats; the two connecting seats are respectively provided with first fixed seats movably, and the two first fixed seats are symmetrically arranged; a first metal strip is arranged between the two first fixed seats; the moving contact mechanism comprises a support frame, the support frame is provided with two second fixed seats movably, the two second fixed seats are symmetrically arranged, and a second metal strip is arranged between the two second fixed seats; a metal connecting sheet is fixedly connected to the second metal strip; each of the metal connecting sheets is electrically connected to a busbar in common, and the busbar is fixedly connected to each of the support frames.

[0005] Furthermore, the action component includes: an operating rod, the operating rod passes through each of the support frames, the operating rod is fixedly connected to each of the support frames, and the operating rod is rotatably set on the base; a rotating shaft, the rotating shaft is rotatably set on the base; a driving gear, the driving gear is fixedly sleeved on the outside of the operating rod; a driven gear, the driven gear is fixedly sleeved on the outside of the rotating shaft, and the driving gear is meshed with the driven gear; a connecting rod, the connecting rod is equal in number to the first metal strip and has a corresponding position, and each of the connecting rods is fixedly sleeved on the outside of the rotating shaft; an extrusion head, each of the connecting rods is provided with an extrusion head, and the extrusion head is used to extrude the first metal strip to produce deformation.

[0006] Furthermore, the static contact mechanism also includes: a first guide rod, one of the first guide rods is provided on each of the two connecting seats, and the first guide rod is horizontally arranged; a first sliding sleeve, one of the first sliding sleeves is embedded on each of the two first fixed seats; wherein the two first guide rods respectively pass through the two first sliding sleeves, and the first guide rod is adapted to the first sliding sleeve.

[0007] Furthermore, the static contact mechanism also includes two first reset components, and the two first reset components are respectively used for resetting the two first fixed seats after movement; the first reset component includes: a first support rod, the first support rod is horizontally arranged, one end of the first support rod is fixedly connected to the first fixed seat, the other end of the first support rod is provided with a first retaining ring, and the first support rod penetrates the connecting seat; a first spring, the first spring is arranged between the first retaining ring and the connecting seat, and the first spring is sleeved on the outside of the first support rod.

[0008] Furthermore, the moving contact mechanism also includes: a second guide rod, two second guide rods are provided on the support frame, and the second guide rods are horizontally arranged; a second sliding sleeve, a second sliding sleeve is embedded on each of the two second fixed seats; wherein the two second guide rods respectively pass through the two second sliding sleeves, and the second guide rod is adapted to the second sliding sleeve.

[0009] Furthermore, the moving contact mechanism also includes two second reset assemblies, and the two second reset assemblies are respectively used for resetting the two second fixed seats after movement; the second reset assembly includes: a second support rod, the first support rod is horizontally arranged, one end of the first support rod is fixedly connected to the second fixed seat, the other end of the second support rod is provided with a second retaining ring, and the second support rod penetrates the support frame; a second spring, the second spring is arranged between the second retaining ring and the support frame, and the second spring is sleeved on the outside of the second support rod.

[0010] Furthermore, two guide rollers are rotatably arranged on the support frame.

[0011] Furthermore, it also includes at least one spring assembly, which includes: a long strip block, which is fixedly arranged outside the operating rod and has a long strip hole running through it; a connecting column, which passes through the long strip hole and is adapted to the long strip hole; a connecting head, which is arranged at one end of the connecting column; a support, which is arranged on the base; and a third spring, which is arranged between the connecting head and the support.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are as follows.

[0013] 1. When the switch is closed, the first metal bar and the second metal bar are in surface contact, and the extrusion head provides an extrusion effect, so that the first metal bar and the second metal bar are bent, thereby effectively improving the contact effect between the first metal bar and the second metal bar, thereby ensuring reliability and safety.

[0014] 2. When the rotating operating lever drives the support frame to rotate, the extrusion head can quickly detach from the first metal strip; under the action of the first spring and the second spring, the first metal strip and the second metal strip are accelerated to quickly straighten, thereby accelerating the opening speed and ensuring reliability and safety.

[0015] 3. Energy is stored by compressing the third spring, which increases the closing speed and reliability when the switch is closed next time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0017] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0018] Figure 2 It is a schematic diagram of the contact state of the static contact mechanism and the moving contact mechanism of the first embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of the contact between the static contact mechanism and the moving contact mechanism and the coordination of the actuating components of the first embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the coordination between the static contact mechanism and the actuating assembly of the first embodiment of the present invention.

[0021] Figure 5 It is a schematic diagram of the cooperation between the moving contact mechanism and the action component of the first embodiment of the present invention.

[0022] Figure 6 It is a schematic diagram of the structure of the moving contact mechanism of the first embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the installation of the third sliding sleeve in the second embodiment of the present invention.

[0024] Figure 8 It is a schematic diagram of the installation of the fourth sliding sleeve of the second embodiment of the present invention.

[0025] Fig. 9 It is a schematic diagram of the overall structure of embodiment 3 of the present invention.

[0026] Fig.10 It is a schematic diagram of the cooperation between the spring assembly and the operating rod of the third embodiment of the present invention.

[0027] In the figure: 1, base; 2, static contact mechanism; 21, insulator; 22, connecting seat; 23, first fixed seat; 24, first metal strip; 25, first reset assembly; 251, first support rod; 252, first retaining ring; 253, first spring; 26, first guide rod; 27, first sliding sleeve; 28, third sliding sleeve; 3, moving contact mechanism; 31, support frame; 32, second fixed seat; 33, second metal strip; 34, second reset assembly; 341, second support rod; 342. Second retaining ring; 343. Second spring; 35. Guide roller; 36. Metal connecting piece; 37. Second guide rod; 38. Second sleeve; 39. Fourth sleeve; 4. Manifold; 5. Action assembly; 51. Operating lever; 52. Driving gear; 53. Rotating shaft; 54. Driven gear; 55. Connecting rod; 56. Extrusion head; 6. Spring assembly; 61. Long strip; 611. Long strip hole; 62. Connecting head; 63. Connecting column; 64. Support; 65. Third spring. DETAILED DESCRIPTION

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

[0029] Embodiment 1

[0030] See also Figure 1-Figure 6 The present invention provides a technical solution: a safety protection type grounding switch device, including a base 1, on which three static contact mechanisms 2 are arranged, and the three static contact mechanisms 2 are evenly spaced; it also includes three moving contact mechanisms 3, and the three static contact mechanisms 2 correspond to the positions of the three moving contact mechanisms 3; an action component 5 is arranged on the base 1, and the action component 5 is used to drive the three static contact mechanisms 2 to rotate, so that the three moving contact mechanisms 3 are respectively in contact with the three static contact mechanisms 2, or the three moving contact mechanisms 3 are respectively separated from the three static contact mechanisms 2; in addition, the action component 5 is also used to squeeze each static contact mechanism 2.

[0031] The static contact mechanism 2 includes two insulators 21, which are arranged on the base 1 at intervals; a connecting seat 22 is fixedly arranged on each insulator 21, and the two connecting seats 22 are symmetrically arranged; a first fixed seat 23 is movably arranged on each connecting seat 22, and the two first fixed seats 23 are symmetrically arranged, and a first metal strip 24 is arranged between the two first fixed seats 23; the first metal strip 24 is made of copper or alloy and is a thin sheet structure, and the two ends of the first metal strip 24 are respectively fixed inside the two first fixed seats 23; the static contact mechanism 2 also includes two first reset components 25, and the two first reset components 25 correspond to the two first fixed seats 23 respectively, and each first reset component 25 is used to reset the corresponding first fixed seat 23 after movement.

[0032] The static contact mechanism 2 also includes two first guide rods 26 and two first sliding sleeves 27. The two first guide rods 26 are respectively fixed on the two connecting seats 22, and the two first guide rods 26 are horizontally arranged; the two first sliding sleeves 27 are respectively embedded in the two first fixed seats 23, the two first guide rods 26 pass through the two first sliding sleeves 27 respectively, and the first guide rods 26 are adapted to the first sliding sleeves 27; since the first guide rods 26 are horizontally arranged and the first guide rods 26 cooperate with the first sliding sleeves 27, the two first fixed seats 23 can be horizontally moved, and when the first metal strip 24 is squeezed, the first metal strip 24 can be deformed, thereby driving the two first fixed seats 23 to move.

[0033] The first reset assembly 25 includes a first support rod 251, which is horizontally arranged; one end of the first support rod 251 is fixedly connected to the first fixing seat 23, and the other end of the first support rod 251 is fixedly arranged with a first retaining ring 252; the first support rod 251 penetrates the connecting seat 22, and a first spring 253 is arranged between the connecting seat 22 and the first retaining ring 252, and the first spring 253 is sleeved on the outside of the first support rod 251.

[0034] The moving contact mechanism 3 includes a support frame 31, on which two second fixed seats 32 are movably arranged, the two second fixed seats 32 are symmetrically arranged, and a second metal strip 33 is arranged between the two second fixed seats 32, the second metal strip 33 can be made of copper or alloy material, and the second metal strip 33 is a thin sheet structure, the two ends of the second metal strip 33 are respectively fixedly arranged inside the two second fixed seats 32, and the width of the second metal strip 33 is greater than the width of the first metal strip 24; two guide rollers 35 are rotatably arranged on the support frame 31, and the two guide rollers 35 are both vertically arranged; specifically, the two guide rollers 35 can be movably connected to the support frame 31 through bearings.

[0035] A busbar 4 is commonly connected to the three support frames 31, and the busbar 4 passes through each support frame 31. Both ends of the busbar 4 are provided with connectors for connecting grounding soft wires (not shown in the figure); at the same time, a metal connecting piece 36 is fixedly connected to one end of each second metal strip 33, and each metal connecting piece 36 is electrically connected to the busbar 4. The metal connecting piece 36 can also be made of copper or alloy thin sheet, so as to realize the electrical connection between the second metal strip 33 and the busbar 4; specifically, the metal connecting piece 36 can be connected to the busbar 4 by a soft wire, or other existing technologies can be used.

[0036] The moving contact mechanism 3 also includes two second reset assemblies 34, and the two first reset assemblies 25 correspond to the two second fixed seats 32 respectively; the second reset assembly 34 includes a second support rod 341, and the second support rod 341 is horizontally arranged; one end of the second support rod 341 is fixedly connected to the second fixed seat 32, and the other end of the second support rod 341 is fixedly provided with a second retaining ring 342; the second support rod 341 passes through the support frame 31, and a second spring 343 is arranged between the support frame 31 and the second retaining ring 342, and the second spring 343 is sleeved on the outside of the second support rod 341.

[0037] The moving contact mechanism 3 component also includes two second guide rods 37 and two second sliding sleeves 38. The two second guide rods 37 are fixedly arranged on the support frame 31, and the two second guide rods 37 are arranged horizontally; the two second sliding sleeves 38 are respectively embedded in the two second fixed seats 32, and the two second guide rods 37 pass through the two second sliding sleeves 38 respectively, and the second guide rods 37 are adapted to the second sliding sleeves 38; through the cooperation between the second guide rods 37 and the second sliding sleeves 38, the horizontal movement of the two second fixed seats 32 can be realized.

[0038] The action assembly 5 includes an operating rod 51 and a rotating shaft 53, both of which are horizontally arranged, and the operating rod 51 and the rotating shaft 53 are rotatably arranged on the base 1; specifically, the operating rod 51 and the rotating shaft 53 can be movably connected to the base 1 through a bearing; a driving gear 52 is fixedly sleeved on the outside of the operating rod 51, and a driven gear 54 is fixedly sleeved on the outside of the rotating shaft 53, the driving gear 52 and the driven gear 54 are meshed, and the transmission ratio between the driving gear 52 and the driven gear 54 is less than one; each support frame 31 is fixedly arranged on the outside of the operating rod 51, and each moving contact mechanism 3 can be driven to rotate by rotating the operating rod 51.

[0039] The action assembly 5 also includes connecting rods 55, the number of connecting rods 55 is equal to that of the static contact mechanism 2 and their positions correspond; each connecting rod 55 is fixedly sleeved on the outside of the rotating shaft 53, and an extrusion head 56 is fixedly provided on the top of each connecting rod 55, and each extrusion head 56 is used to extrude the corresponding first metal strip 24; specifically, the side of each first extrusion head 56 close to the corresponding first metal strip 24 is an arc surface structure, and the arc structure is used to extrude the first metal strip 24; in addition, each extrusion head 56 is located between the corresponding two first fixed seats 23; each extrusion head 56 corresponds to the position of each moving contact mechanism 3, and the distance between the axis of the two guide rollers 35 corresponding to the moving contact mechanism 3 and the center of the corresponding extrusion head 56 is equal.

[0040] In this embodiment, if Figure 3 As shown, when in the closed state, each first metal strip 24 contacts the corresponding second metal strip 33, and the extrusion head 56 is extruded on one side of the first metal strip 24, the first metal strip 24 then squeezes the second metal strip 33, and the first metal strip 24 and the second metal strip 33 are bent under the action of the guide roller 35, at this time, each first spring 253 and the second spring 343 are in a compressed state; since the first metal strip 24 and the second metal strip 33 are thin sheet structures, the first metal strip 24 and the second metal strip 33 are in surface contact, and the extrusion head 56 provides an extrusion effect, so that the first metal strip 24 and the second metal strip 33 are bent, thereby effectively improving the contact effect of the first metal strip 24 and the second metal strip 33, thereby ensuring reliability and safety.

[0041] When opening the gate, the operating rod 51 can be rotated by an operating tool to further drive the driving gear 52 and the driven gear 54 to rotate, thereby driving the support frame 31 and the connecting rod 55 to rotate, and causing the second metal strip 33 to move away from the first metal strip 24. Since the transmission ratio of the driving gear 52 and the driven gear 54 is less than one, the rotating shaft 53 can be rotated by a larger angle when the operating rod 51 is rotated by a smaller angle, so that it is convenient for the extrusion head 56 to quickly separate from the first metal strip 24; the first metal strip 24 and the second metal strip 33 are made of copper or alloy. When the extrusion is released, the first metal strip 24 and the second metal strip 33 themselves can be reset to a straight state. When the rotating operating rod 51 drives the support frame 31 to rotate, the first spring 253 and the second spring 343 accelerate the first metal strip 24 and the second metal strip 33 to quickly straighten. Therefore, during the opening process, it is convenient for the first metal strip 24 and the second metal strip 33 to quickly straighten, thereby helping to accelerate the separation of the first metal strip 24 from the second metal strip 33, that is, accelerating the opening speed, ensuring reliability and safety.

[0042] Embodiment 2

[0043] See also Figure 1-Figure 8This embodiment is based on the first embodiment, and the static contact mechanism 2 also includes a third sleeve 28. A third sleeve 28 is embedded in each connecting seat 22. The third sleeve 28 is sleeved on the outside of the first support rod 251, and the third sleeve 28 is adapted to the first support rod 251. The first support rod 251 cooperates with the third sleeve 28 to improve the stability of the movement of the first fixed seat 23.

[0044] The moving contact mechanism 3 also includes a fourth sliding sleeve 39. Two fourth sliding sleeves 39 are embedded on the support frame 31. The two second support rods 341 pass through the two fourth sliding sleeves 39 respectively, and the fourth sliding sleeve 39 is adapted to the second support rod 341. The second support rod 341 cooperates with the fourth sliding sleeve 39 to improve the stability of the movement of the second fixed seat 32.

[0045] Embodiment 3

[0046] See also Fig. 9 and Fig.10 This embodiment is based on the second embodiment, and the grounding switch device further includes at least one spring assembly 6; Fig. 9 As shown, two spring assemblies 6 are provided, and the two spring assemblies 6 are arranged at intervals; the spring assembly 6 includes a long strip block 61 fixedly arranged on the outside of the operating rod 51, one end of the long strip block 61 is fixedly sleeved on the outside of the operating rod 51, and a long strip hole 611 is penetrated on the long strip block 61; the spring assembly 6 also includes a support 64 and a connecting head 62, and the support 64 is fixedly arranged on the base 1; a third spring 65 is connected between the connecting head 62 and the support 64; a connecting column 63 is fixedly provided on the connecting head 62, and the connecting column 63 passes through the long strip hole 611, and the connecting column 63 is adapted to the long strip hole 611; specifically, the outer diameter of the connecting column 63 is equal to the width of the long strip hole 611; in addition, the side of the connecting head 62 adjacent to the long strip block 61 abuts against the long strip block 61.

[0047] When switching from the closing state to the opening state, that is, when the operating lever 51 is rotated, the operating lever 51 drives the long block 61 to rotate, and the long block 61 squeezes the connecting head 62, and the connecting column 63 moves in the long hole 611, and can compress the third spring 65 to produce deformation; energy is stored by compressing the third spring 65, so that the operating lever 51 can rotate quickly when closing the switch next time, which helps to increase the closing speed and thus improve reliability.

[0048] Finally, it should be noted that the above description 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 replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, 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 safety protection type grounding switch device, comprising a base (1), characterized in that: Also includes: A stationary contact mechanism (2), the stationary contact mechanism (2) comprising a plurality of stationary contact mechanisms (2), the plurality of stationary contact mechanisms (2) being arranged at intervals on the base (1); A moving contact mechanism (3), wherein the moving contact mechanism (3) and the stationary contact mechanism (2) are equal in number and have corresponding positions; An action component (5), wherein the action component (5) drives all the moving contact mechanisms (3) to rotate, and the action component (5) is also used to squeeze the first metal strip (24); The static contact mechanism (2) comprises two insulators (21), and the two insulators (21) are respectively provided with a connecting seat (22); the two connecting seats (22) are respectively provided with a first fixing seat (23) movably, and the two first fixing seats (23) are symmetrically arranged; and a first metal strip (24) is arranged between the two first fixing seats (23); The movable contact mechanism (3) comprises a support frame (31), on which two second fixing seats (32) are movably arranged, the two second fixing seats (32) are symmetrically arranged, and a second metal strip (33) is arranged between the two second fixing seats (32); a metal connecting piece (36) is fixedly connected to the second metal strip (33); Each of the metal connecting sheets (36) is electrically connected to a collector tube (4), and the collector tube (4) is fixedly connected to each of the supporting frames (31).

2. A safety protection type grounding switch device according to claim 1, characterized in that: The action component (5) comprises: An operating rod (51), the operating rod (51) passing through each of the supporting frames (31), the operating rod (51) being fixedly connected to each of the supporting frames (31), and the operating rod (51) being rotatably disposed on the base (1); A rotating shaft (53), the rotating shaft (53) being rotatably disposed on the base (1); A driving gear (52), wherein the driving gear (52) is fixedly sleeved on the outside of the operating rod (51); A driven gear (54), wherein the driven gear (54) is fixedly sleeved on the outside of the rotating shaft (53), and the driving gear (52) is meshed with the driven gear (54); Connecting rods (55), the connecting rods (55) are equal in number and corresponding in position to the first metal strip (24), and each of the connecting rods (55) is fixedly sleeved outside the rotating shaft (53); An extrusion head (56), each of the connecting rods (55) is provided with an extrusion head (56), and the extrusion head (56) is used to extrude the first metal strip (24) to generate deformation.

3. A safety protection type grounding switch device according to claim 1, characterized in that: The stationary contact mechanism (2) further comprises: A first guide rod (26), each of the two connecting seats (22) is provided with a first guide rod (26), and the first guide rod (26) is arranged horizontally; A first sliding sleeve (27), each of the two first fixing seats (23) being embedded with a first sliding sleeve (27); The two first guide rods (26) pass through the two first sliding sleeves (27) respectively, and the first guide rods (26) are adapted to the first sliding sleeves (27).

4. A safety protection type grounding switch device according to claim 1, characterized in that: The stationary contact mechanism (2) further comprises two first reset assemblies (25), the two first reset assemblies (25) being respectively used for resetting the two first fixed seats (23) after movement; the first reset assemblies (25) comprising: A first support rod (251), the first support rod (251) is arranged horizontally, one end of the first support rod (251) is fixedly connected to the first fixing seat (23), the other end of the first support rod (251) is provided with a first retaining ring (252), and the first support rod (251) penetrates the connecting seat (22); A first spring (253), wherein the first spring (253) is arranged between the first retaining ring (252) and the connecting seat (22), and the first spring (253) is sleeved outside the first supporting rod (251).

5. A safety protection type grounding switch device according to claim 1, characterized in that: The moving contact mechanism (3) further comprises: A second guide rod (37), wherein two second guide rods (37) are arranged on the support frame (31), and the second guide rods (37) are arranged horizontally; A second sliding sleeve (38), each of the two second fixing seats (32) being embedded with a second sliding sleeve (38); The two second guide rods (37) pass through the two second sliding sleeves (38) respectively, and the second guide rods (37) are matched with the second sliding sleeves (38).

6. A safety protection type grounding switch device according to claim 1, characterized in that: The moving contact mechanism (3) further comprises two second reset assemblies (34), the two second reset assemblies (34) being respectively used for resetting the two second fixing seats (32) after movement; the second reset assemblies (34) comprising: A second support rod (341), wherein the first support rod (251) is arranged horizontally, one end of the first support rod (251) is fixedly connected to a second fixing seat (32), the other end of the second support rod (341) is provided with a second retaining ring (342), and the second support rod (341) penetrates the support frame (31); A second spring (343), wherein the second spring (343) is arranged between the second retaining ring (342) and the support frame (31), and the second spring (343) is sleeved outside the second support rod (341).

7. A safety protection type grounding switch device according to claim 1, characterized in that: Two guide rollers (35) are rotatably arranged on the support frame (31).

8. A safety protection type grounding switch device according to claim 2, characterized in that: Also included is at least one spring assembly (6), the spring assembly (6) comprising: A long strip block (61), the long strip block (61) is fixedly arranged outside the operating rod (51), and a long strip hole (611) is penetrated through the long strip block (61); A connecting post (63), wherein the connecting post (63) passes through the elongated hole (611), and the connecting post (63) is adapted to the elongated hole (611); A connecting head (62), wherein the connecting head (62) is arranged at one end of the connecting column (63); A support (64), wherein the support (64) is arranged on the base (1); A third spring (65), wherein the third spring (65) is arranged between the connecting head (62) and the support (64).

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