An integrated ring main unit with stable opening and closing

Abstract

The present invention relates to the technical field of ring network cabinets, and specifically to an integrated ring network cabinet with stable opening and closing, comprising a shell, a heat dissipation window provided on the shell, a shielding mechanism provided on the shell, a protective mechanism provided on the shielding mechanism and in the shell, the shell is fixedly connected to the base plate, a movable mechanism is provided in the base plate, a mounting mechanism is provided in the shell, and a limiting mechanism is provided on the mounting mechanism; when in use, the shielding mechanism and the protective mechanism cooperate to facilitate the shielding and protection of the top of the shell, and at the same time, when it rains continuously, the heat dissipation window on the shell can be automatically closed to prevent rainwater from seeping into the shell; the movable mechanism makes it more convenient to push the equipment when installing and positioning the entire equipment; the mounting mechanism and the limiting mechanism make it convenient to adjust the mounting frame of the electrical component, so that some electrical components that are close to the inside or located on the side can be more convenient to repair.

Description

Technical Field

[0001] The present invention relates to the technical field of ring main unit (RMU), in particular to an integrated RMU with stable opening and closing. Background Art

[0002] A ring main unit (RMU) is a group of electrical transmission and distribution equipment housed within a metal or non-metallic insulated cabinet or assembled as a compartmented ring main unit. It offers advantages such as simple structure, low cost, stable operation, improved power supply parameters and performance, and improved power supply safety. It is widely used in distribution stations and box-type substations in load centers such as urban residential areas, high-rise buildings, large public buildings, and factories and enterprises, typically in an integrated configuration.

[0003] However, traditional ring network cabinets are mostly installed outdoors, and it often rains outdoors. The top of the ring network cabinet is directly eroded by rain for a long time, which is prone to corrosion. At the same time, when it rains continuously, rainwater can easily penetrate into the ring network cabinet through the heat dissipation windows on the ring network cabinet shell, which can easily cause short circuits in the internal electrical components. At the same time, the weight of the entire ring network cabinet is generally large. During the installation and positioning process, it is difficult to install the ring network cabinet in the correct position at one time by hoisting alone. When the deviation of the hoisting landing point is large, it is difficult to quickly move the ring network cabinet to the appropriate position. In addition, the electrical components inside the traditional ring network cabinet are generally fixed and installed in advance. Therefore, during the maintenance process, it is not convenient for maintenance personnel to operate some electrical components that are close to the inside or located on the side. Summary of the Invention

[0004] In response to the problems in the prior art, the present invention provides an integrated ring main unit with stable opening and closing.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an integrated ring main unit with stable opening and closing, comprising a shell, a heat dissipation window provided on the shell, a shielding mechanism provided on the shell, a protective mechanism provided on the shielding mechanism and inside the shell, the shell being fixedly connected to a bottom plate, a moving mechanism provided inside the bottom plate, a mounting mechanism provided inside the shell, and a limiting mechanism provided on the mounting mechanism;

[0006] The shielding mechanism includes a first spring, a plurality of first springs fixedly connected to the housing, a shielding block fixedly connected to the plurality of first springs, a plurality of support rods fixedly connected to the housing, the support rods passing through and slidably connected to the shielding block, and the plurality of first springs respectively wound around the plurality of support rods, two shielding plates fixedly connected to the shielding block, the shielding plates being arranged at an angle, a plurality of guide grooves being provided on the shielding plate, and the plurality of guide grooves being linearly distributed at equal intervals;

[0007] The protective mechanism includes a push rod, a push rod is fixedly connected to the shielding block, a connecting block is fixedly connected to the push rod, a plastic sealing film is fixedly connected to the connecting block, a connecting shaft is rotatably connected inside the shell, a storage roller is fixedly connected to the connecting shaft, the plastic sealing film is fixedly connected to the storage roller, and the plastic sealing film is wound around the storage roller, a spring is fixedly connected to the connecting shaft, and the spring is fixedly connected to the inside of the shell.

[0008] Specifically, the moving mechanism includes a stop block, two groups of stop blocks are slidably connected in the base plate, each group of the stop blocks is provided with two, the stop blocks abut against the mounting block, the mounting block is slidably connected to the inside of the base plate, and a roller is installed on the mounting block, the ends of the stop blocks and the mounting block that abut against each other are wedge-shaped, and two second springs are fixedly connected to the mounting block, the second springs are fixedly connected to the inside of the base plate, two knobs are provided on the base plate, a screw rod is fixedly connected to the knob, the screw rod is rotatably connected to the inside of the base plate, and the two screw rods are respectively threadedly connected to the inside of the two groups of stop blocks, and the thread directions on both sides of the screw rod are opposite.

[0009] Specifically, the mounting mechanism includes a cabinet body, a cabinet body is installed in the shell, a slide is slidably connected to the cabinet body through a slider, a mounting plate is fixedly connected to the slide, a plurality of balls are installed on the slide, and the balls abut against the inside of the cabinet body, and the limiting mechanism includes a handle, a handle is fixedly connected to the slider, a through groove is provided on the handle, a pressure block is provided on the handle, a clamping rod is fixedly connected to the pressure block, the clamping rod is engaged with the inside of the cabinet body, and a third spring is fixedly connected to the pressure block, the third spring is fixedly connected to the inside of the handle, and the third spring is wound around the clamping rod.

[0010] The beneficial effects of the present invention are:

[0011] (1) The integrated ring network cabinet with stable opening and closing described in the present invention is provided with a shielding mechanism on the shell, and a protective mechanism on the shell and the shielding mechanism when in use. Through the cooperation of the shielding mechanism and the protective mechanism, the top of the shell is conveniently shielded and protected to prevent rainwater from directly eroding the top of the shell. At the same time, when it rains continuously, the heat dissipation window on the shell can be automatically closed to prevent rainwater from seeping into the shell, thereby reducing the impact of rain on the internal electrical components of the equipment; that is: in actual operation, through the shielding block and the shielding sheet, it is convenient to shield rainwater during rainfall to prevent rainwater from directly eroding the top of the shell, and the shielding sheet is provided. The diversion groove facilitates the diversion and discharge of rainwater. Furthermore, when it rains continuously, rainwater will gradually accumulate inside the shielding block, and the pressure of the shielding block on the first spring will gradually increase, and the first spring will gradually shrink, and the shielding block will move downward, driving the push rod to move downward at the same time, and the movement of the push rod drives the connecting block to move. As the connecting block moves, the plastic sealing film will gradually unfold, and the connecting shaft and the storage roller will rotate at the same time, and the spring will shrink until the plastic sealing film completely closes the heat dissipation window. Therefore, when it rains continuously, the heat dissipation window on the shell can be automatically closed to prevent rainwater from seeping into the shell and reduce the impact of rainy days on the internal electrical components of the equipment.

[0012] (2) The integrated ring network cabinet with stable opening and closing described in the present invention has a moving mechanism arranged inside the bottom plate when in use. Through the moving mechanism, it is more convenient to push the equipment when installing and positioning the entire equipment, making the installation process faster and more convenient; that is: when installing the entire ring network cabinet, when the crane lifts the ring network cabinet to the approximate position, the user can turn the knob, and the rotation of the knob drives the screw rod to rotate. As the screw rod rotates, it will drive the two blocks to gradually move toward each other, and then the two installation blocks will be squeezed. After the installation blocks are squeezed, they will gradually move downward, and the second spring will be compressed at the same time until the roller is in contact with the ground, so that the entire ring network cabinet can be pushed by the roller, so that it is more convenient to push the equipment during the installation and positioning process, making the installation process faster and more convenient.

[0013] (3) The integrated ring network cabinet with stable opening and closing described in the present invention is provided with a mounting mechanism inside the shell and a limiting mechanism on the mounting mechanism when in use. Through the cooperation of the mounting mechanism and the limiting mechanism, the mounting frame of the electrical components can be adjusted and moved conveniently, so that some electrical components located inside or on the side can be repaired more conveniently; that is, when repairing the equipment, the user can first open the shell, then open the cabinet, and then manually hold the handle and press the pressure block, so that the pressure block is pressed down, driving the card rod At the same time, it moves downward, and the third spring is compressed until the card rod is separated from the interior of the cabinet. After that, the slider can be pulled by the handle, and the movement of the slider drives the movement of the slide plate, and the ball bearings roll accordingly, and the movement of the slide plate drives the mounting plate to move until the electrical components set on the mounting plate are moved out of the cabinet. At this time, the pressure block is released, and under the action of the third spring, the card rod is re-engaged in the interior of the cabinet, thereby facilitating the adjustment and movement of the slide plate and the mounting plate, making it more convenient to repair some electrical components that are close to the inside or on the side. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and examples.

[0015] Figure 1 A schematic diagram of the overall structure of a preferred embodiment of an integrated ring main unit with stable opening and closing provided by the present invention;

[0016] Figure 2 Schematic diagram of the connection structure between the housing and the protective mechanism of the present invention;

[0017] Figure 3 This is a schematic diagram of the connection structure between the connecting block and the plastic sealing film of the present invention;

[0018] Figure 4 It is a schematic diagram of the connection structure of the housing, the mounting mechanism and the limiting mechanism of the present invention;

[0019] Figure 5 This is a schematic diagram of the connection structure of the cabinet, slider, handle, pressure block, clamping rod and third spring of the present invention;

[0020] Figure 6 Schematic diagram of the connection structure between the base plate and the moving mechanism of the present invention;

[0021] Figure 7 for Figure 1 An enlarged schematic diagram of the structure of section A is shown;

[0022] Figure 8 for Figure 4 The enlarged schematic diagram of the structure of part B is shown.

[0023] In the figure: 1. shell; 2. heat dissipation window; 3. shielding mechanism; 301. first spring; 302. shielding block; 303. shielding sheet; 304. guide groove; 305. support rod; 4. protection mechanism; 401. push rod; 402. connecting block; 403. plastic sealing film; 404. storage roller; 405. connecting shaft; 406. spring; 5. bottom plate; 6. moving mechanism; 601. knob; 602. screw rod; 603. stop block; 604. mounting block; 605. second spring; 606. roller; 7. mounting mechanism; 701. cabinet; 702. slide plate; 703. mounting plate; 704. slider; 705. ball bearing; 8. limiting mechanism; 801. handle; 802. pressure block; 803. clamping rod; 804. third spring. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0025] like Figures 1-8 As shown, the integrated ring main unit with stable opening and closing according to the present invention includes a housing 1, a heat dissipation window 2 is provided on the housing 1, a shielding mechanism 3 is provided on the housing 1, a protective mechanism 4 is provided on the shielding mechanism 3 and in the housing 1, the housing 1 is fixedly connected to a bottom plate 5, a moving mechanism 6 is provided in the bottom plate 5, a mounting mechanism 7 is provided in the housing 1, and a limiting mechanism 8 is provided on the mounting mechanism 7;

[0026] The shielding mechanism 3 includes a first spring 301. A plurality of first springs 301 are fixedly connected to the housing 1. A shielding block 302 is fixedly connected to the plurality of first springs 301. A plurality of support rods 305 are fixedly connected to the housing 1. The support rods 305 pass through and are slidably connected to the shielding block 302. The plurality of first springs 301 are respectively wound around the plurality of support rods 305. Two shielding plates 303 are fixedly connected to the shielding block 302. The shielding plates 303 are arranged at an angle. The shielding plates 303 are provided with a plurality of guide grooves 304. The plurality of guide grooves 304 are linearly distributed at equal intervals.

[0027] The protection mechanism 4 includes a push rod 401, the shielding block 302 is fixedly connected to the push rod 401, the push rod 401 is fixedly connected to the connecting block 402, the connecting block 402 is fixedly connected to the plastic sealing film 403, the shell 1 is rotatably connected to a connecting shaft 405, the connecting shaft 405 is fixedly connected to a receiving roller 404, the plastic sealing film 403 is fixedly connected to the receiving roller 404, and the plastic sealing film 403 is wound around the receiving roller 404, the connecting shaft 405 is fixedly connected to a clockwork spring 406, the The clockwork spring 406 is fixedly connected to the inside of the housing 1; when in use, the shielding mechanism 3 is arranged on the housing 1, and the protective mechanism 4 is arranged on the housing 1 and the shielding mechanism 3. Through the cooperation of the shielding mechanism 3 and the protective mechanism 4, the top of the housing 1 is conveniently shielded and protected to prevent rainwater from directly eroding the top of the housing 1. At the same time, when it rains continuously, the heat dissipation window on the housing 1 can be automatically closed to prevent rainwater from penetrating into the interior of the housing 1, thereby reducing the impact of rain on the internal electrical components of the device; that is, : In actual operation, the shielding block 302 and the shielding sheet 303 are used to block rainwater during rainfall, thereby preventing rainwater from directly eroding the top of the shell 1, and the guide groove 304 on the shielding sheet 303 is used to guide and discharge rainwater. Furthermore, when rainfall continues, rainwater will gradually accumulate inside the shielding block 302, and the pressure of the shielding block 302 on the first spring 301 will gradually increase, and the first spring 301 will gradually contract, and the shielding block 302 will move downward, driving the The push rod 401 moves downward at the same time, and the movement of the push rod 401 drives the connecting block 402 to move. As the connecting block 402 moves, the plastic sealing film 403 will gradually unfold, and the connecting shaft 405 and the receiving roller 404 will rotate at the same time, and the mainspring 406 will contract until the plastic sealing film 403 completely closes the heat dissipation window 2. Therefore, when it rains continuously, the heat dissipation window 2 on the shell 1 can be automatically closed to prevent rainwater from seeping into the shell 1, thereby reducing the impact of rain on the internal electrical components of the device.

[0028] Specifically, the moving mechanism 6 includes a stop block 603, two groups of stop blocks 603 are slidably connected in the bottom plate 5, and each group of the stop blocks 603 is provided with two, the stop blocks 603 abut against the mounting block 604, the mounting block 604 is slidably connected to the inside of the bottom plate 5, and a roller 606 is installed on the mounting block 604, the ends of the stop blocks 603 and the mounting block 604 that abut are both wedge-shaped, and two second springs 605 are fixedly connected to the mounting block 604, and the second spring 605 is fixedly connected to the inside of the bottom plate 5, two knobs 601 are provided on the bottom plate 5, and a screw rod 602 is fixedly connected to the knob 601, and the screw rod 602 is rotatably connected to the inside of the bottom plate 5, and the two screw rods 602 are respectively threadedly connected to the inside of the two groups of stop blocks 603, and the threads on both sides of the screw rod 602 are in opposite directions; when in use, the moving mechanism 6 is arranged inside the base plate 5, and through the moving mechanism 6, it is more convenient to push the equipment when installing and positioning the entire equipment, making the installation process faster and more convenient; that is: when installing the entire ring network cabinet, when the crane lifts the ring network cabinet to the approximate position, the user can rotate the knob 601, and the rotation of the knob 601 drives the screw rod 602 to rotate. As the screw rod 602 rotates, it will drive the two abutting blocks 603 to gradually move toward each other, and then abut and squeeze the two mounting blocks 604. After being squeezed, the mounting blocks 604 will gradually move downward, and the second spring 605 will be compressed at the same time until the roller 606 abuts against the ground, and then the entire ring network cabinet will be pushed by the roller 606, so that during the installation and positioning process, it is more convenient to push the equipment, making the installation process faster and more convenient.

[0029] Specifically, the mounting mechanism 7 includes a cabinet 701, a cabinet 701 is installed in the housing 1, a slide 702 is slidably connected to the cabinet 701 through a slider 704, a mounting plate 703 is fixedly connected to the slide 702, a plurality of balls 705 are installed on the slide 702, and the balls 705 abut against the inside of the cabinet 701, the limiting mechanism 8 includes a handle 801, a handle 801 is fixedly connected to the slider 704, a through slot is provided on the handle 801, a pressure block 802 is provided on the handle 801, and the The pressing block 802 is fixedly connected with a clamping rod 803, and the clamping rod 803 is engaged with the inside of the cabinet 701, and the pressing block 802 is fixedly connected with a third spring 804, and the third spring 804 is fixedly connected to the inside of the handle 801, and the third spring 804 is wound around the clamping rod 803; when in use, the mounting mechanism 7 is arranged inside the housing 1, and the limiting mechanism 8 is arranged on the mounting mechanism 7. Through the cooperation of the mounting mechanism 7 and the limiting mechanism 8, it is convenient to adjust and move the mounting frame of the electrical components, so that for some inner or outer parts, the mounting mechanism 7 and the limiting mechanism 8 can be adjusted and moved. The electrical components located on the side can be more convenient to repair; that is, when repairing the equipment, the user can first open the shell 1, then open the cabinet 701, and then manually hold the handle 801 and press the pressure block 802, so that the pressure block 802 is pressed down, driving the clamping rod 803 to move down at the same time, and the third spring 804 is compressed at the same time until the clamping rod 803 is separated from the interior of the cabinet 701. After that, the slider 704 can be pulled by the handle 801, and the slider 704 The movement drives the slide plate 702 to move, and the ball bearing 705 rolls accordingly. The movement of the slide plate 702 drives the mounting plate 703 to move until the electrical components set on the mounting plate 703 are moved out of the cabinet 701. At this time, the pressure block 802 is released, and under the action of the third spring 804, the clamping rod 803 is re-engaged in the cabinet 701, thereby facilitating the adjustment and movement of the slide plate 702 and the mounting plate 703, making it more convenient to repair some electrical components that are close to the inside or on the side.

[0030] When the present invention is in use, first, when installing the entire ring network cabinet, when the crane hoists the ring network cabinet to the approximate position, the user can rotate the knob 601, and the rotation of the knob 601 drives the screw rod 602 to rotate. As the screw rod 602 rotates, the two blocks 603 are driven to gradually move toward each other, thereby contacting and squeezing the two mounting blocks 604. After the mounting blocks 604 are squeezed, they will gradually move downward, and the second spring 605 will be compressed at the same time until the roller 606 contacts the ground, thereby facilitating the pushing of the entire ring network cabinet through the roller 606, thereby making it more convenient to push the equipment during the installation and positioning process, making the installation process more convenient. The utility model is quick and convenient; in actual operation, the shielding block 302 and the shielding sheet 303 are used to shield rainwater during rainfall, thereby preventing rainwater from directly eroding the top of the shell 1, and the guide groove 304 on the shielding sheet 303 is convenient for guiding and discharging rainwater. Furthermore, when rainfall continues, rainwater will gradually accumulate inside the shielding block 302, and the pressure of the shielding block 302 on the first spring 301 will gradually increase, and the first spring 301 will gradually contract, and the shielding block 302 will move downward, driving the push rod 401 to move downward at the same time, and the movement of the push rod 401 drives the connecting block 402 to move, and as the connecting block 402 moves, it drives the plastic seal The film 403 is gradually unfolded, the connecting shaft 405 and the receiving roller 404 rotate at the same time, and the spring 406 contracts until the plastic sealing film 403 completely closes the heat dissipation window 2, so that when it rains continuously, the heat dissipation window 2 on the shell 1 can be automatically closed to prevent rainwater from seeping into the inside of the shell 1, thereby reducing the impact of rain on the internal electrical components of the equipment; in addition, when repairing the equipment, the user can first open the shell 1, then open the cabinet 701, and then manually hold the handle 801 and press the pressure block 802, so that the pressure block 802 is pressed downward, driving the card rod 803 to move downward at the same time, and the third spring 804 is compressed at the same time until the card rod 803 is pressed downward. The rod 803 is separated from the interior of the cabinet 701, and then the slider 704 can be pulled by the handle 801, and the movement of the slider 704 drives the slide plate 702 to move, and the ball 705 rolls accordingly, and the movement of the slide plate 702 drives the mounting plate 703 to move until the electrical components set on the mounting plate 703 are moved out of the cabinet 701. At this time, the pressure block 802 is released, and under the action of the third spring 804, the clamping rod 803 is re-engaged in the interior of the cabinet 701, thereby facilitating the adjustment and movement of the slide plate 702 and the mounting plate 703, making it more convenient to repair some electrical components that are close to the inside or on the side.

[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0032] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An integrated ring main unit with stable opening and closing, characterized in that: The invention comprises a shell (1), a heat dissipation window (2) is provided on the shell (1), a shielding mechanism (3) is provided on the shell (1), a protective mechanism (4) is provided on the shielding mechanism (3) and inside the shell (1), the shell (1) is fixedly connected to a bottom plate (5), a moving mechanism (6) is provided inside the bottom plate (5), a mounting mechanism (7) is provided inside the shell (1), and a limiting mechanism (8) is provided on the mounting mechanism (7); The shielding mechanism (3) comprises a first spring (301), a plurality of first springs (301) are fixedly connected to the housing (1), and a shielding block (302) is fixedly connected to the plurality of first springs (301); The protection mechanism (4) comprises a push rod (401), the shielding block (302) is fixedly connected to the push rod (401), the push rod (401) is fixedly connected to the connecting block (402), the connecting block (402) is fixedly connected to the plastic sealing film (403), a connecting shaft (405) is rotatably connected inside the housing (1), a receiving roller (404) is fixedly connected to the connecting shaft (405), the plastic sealing film (403) is fixedly connected to the receiving roller (404), and the plastic sealing film (403) is wound around the receiving roller (404), a spring (406) is fixedly connected to the connecting shaft (405), and the spring (406) is fixedly connected to the inside of the housing (1); The moving mechanism (6) includes a stop block (603), two groups of stop blocks (603) are slidably connected in the bottom plate (5), and each group of the stop blocks (603) is provided with two. The stop blocks (603) abut against a mounting block (604), and the mounting block (604) is slidably connected in the bottom plate (5), and a roller (606) is installed on the mounting block (604); The mounting mechanism (7) comprises a cabinet (701), the cabinet (701) being mounted in the housing (1), a slide plate (702) being slidably connected to the cabinet (701) via a slider (704), a mounting plate (703) being fixedly connected to the slide plate (702), a plurality of balls (705) being mounted on the slide plate (702), and the balls (705) being in contact with the interior of the cabinet (701).

2. The integrated ring main unit with stable opening and closing according to claim 1, characterized in that: A plurality of support rods (305) are fixedly connected to the housing (1), the support rods (305) pass through and are slidably connected to the shielding block (302), and a plurality of the first springs (301) are respectively wound around the plurality of support rods (305).

3. The integrated ring main unit with stable opening and closing according to claim 2, characterized in that: Two shielding plates (303) are fixedly connected to the shielding block (302), and the shielding plates (303) are arranged in an inclined manner.

4. The integrated ring main unit with stable opening and closing according to claim 3 is characterized in that: A plurality of guide grooves (304) are provided on the mask (303), and the plurality of guide grooves (304) are linearly distributed at equal intervals.

5. The integrated ring main unit with stable opening and closing according to claim 1, characterized in that: The ends of the abutting block (603) and the mounting block (604) that abut against each other are both wedge-shaped, and two second springs (605) are fixedly connected to the mounting block (604), and the second springs (605) are fixedly connected to the inside of the bottom plate (5).

6. The integrated ring main unit with stable opening and closing according to claim 5, characterized in that: Two knobs (601) are provided on the bottom plate (5), and a screw rod (602) is fixedly connected to the knob (601). The screw rod (602) is rotatably connected to the inside of the bottom plate (5), and the two screw rods (602) are respectively threadedly connected to the inside of the two sets of blocks (603), and the threads on both sides of the screw rod (602) are in opposite directions.

7. The integrated ring main unit with stable opening and closing according to claim 1, characterized in that: The limiting mechanism (8) comprises a handle (801), the slider (704) is fixedly connected to the handle (801), and the handle (801) is provided with a through slot.

8. The integrated ring main unit with stable opening and closing according to claim 7, characterized in that: The handle (801) is provided with a pressing block (802), the pressing block (802) is fixedly connected to a clamping rod (803), the clamping rod (803) is engaged with the inside of the cabinet (701), and the pressing block (802) is fixedly connected to a third spring (804), the third spring (804) is fixedly connected to the inside of the handle (801), and the third spring (804) is wound around the clamping rod (803).

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