A movable European-style high-voltage prefabricated substation

Abstract

The present application relates to the technical field of substations, and discloses a movable European high-voltage prefabricated substation, comprising a plurality of side panels, a plurality of bottom panels, two top panels and a fixing structure, wherein the fixing structure is used to install the plurality of side panels, the plurality of bottom panels and the two top panels, and the top panel is provided with a fixing plate, the fixing plate is provided with a fixing groove, and the fixing groove is located between the two top panels. The present application is provided on the top panel through the fixing plate, and the fixing groove is located between the two top panels. If it rains, rainwater enters the fixing groove along the gap between the two top panels, so that the fixing groove can store rainwater, thereby reducing the situation where rainwater continues to drip and affects the substation, and allowing the substation to operate normally.

Description

Technical Field

[0001] The present application relates to the technical field of substations, and in particular to a movable European-style high-voltage prefabricated substation. Background Art

[0002] Prefabricated substations, also known as box-type substations or combined substations, are type-tested equipment used to transmit electrical energy from high-voltage systems to low-voltage systems or from low-voltage systems to high-voltage systems. Prefabricated substations are relatively easy to install and maintain, and usually have the characteristics of small on-site installation workload, simple installation, and easy mobility.

[0003] In the related art, the substation includes multiple side panels, two top panels, multiple bottom panels and a fixed structure. The fixed structure installs each side panel on a different bottom panel, and the fixed structure is used to install each top panel on multiple side panels, and the multiple side panels, multiple bottom panels and two top panels are fixed by the fixed structure.

[0004] Some substations are placed outdoors. Since the two roof panels of the substation are formed by splicing a fixed structure, if it rains, rainwater may enter the substation through the gap between the two roof panels, causing damage to the interior of the substation, which poses certain risks and even affects the normal use of the substation. Summary of the Invention

[0005] In order to improve the problem that rainwater easily enters from the two roof plates, the present application provides a movable European-style high-voltage prefabricated substation.

[0006] This application provides a movable European-style high-voltage prefabricated substation, which adopts the following technical solutions:

[0007] A movable European-style high-voltage prefabricated substation includes multiple side panels, multiple bottom panels, two top panels, and a fixing structure. The fixing structure is used to install the multiple side panels, multiple bottom panels, and two top panels. The top panels are provided with fixing plates, which are provided with fixing grooves. The fixing grooves are located between the two top panels.

[0008] By adopting the above technical solution, the fixing plate is set on the top plate, and the fixing groove is located between the two top plates. If it rains, rainwater enters the fixing groove along the gap between the two top plates, so that the fixing groove can store rainwater, reducing the situation where rainwater continues to drip and affect the substation, allowing the substation to operate normally.

[0009] Optionally, a limiting strip is provided on the fixed plate, a limiting groove for inserting the limiting strip is opened on the top plate, and a water-absorbing sponge is provided on the limiting strip; when the limiting strip is inserted into the limiting groove, the water-absorbing sponge abuts against the groove wall of the limiting groove.

[0010] By adopting the above technical solution, the limiting strip is inserted into the limiting groove, and the water-absorbing sponge can abut the groove wall of the limiting groove. If rainwater flows along the top plate toward the surface of the fixed plate, the water-absorbing sponge can absorb the rainwater to prevent the rainwater from flowing along the surface of the top plate and affecting the substation.

[0011] Optionally, a mounting plate is provided on the top plate, and an elastic strip is provided on the mounting plate, and the elastic strip is located on the side of the fixing plate away from the top plate; when the mounting plate is installed on the top plate, the elastic strip is deformed toward the side away from the top plate.

[0012] By adopting the above technical solution, the mounting plate is installed on the top plate. At this time, the elastic strip is located on the side of the fixed plate away from the top plate, and the elastic strip is deformed toward the side away from the top plate, so that the elastic strip can drive the fixed plate to move toward the top plate, thereby making the gap between the water-absorbing sponge and the wall of the limiting groove smaller, making it difficult for rainwater to pass through the water-absorbing sponge, and allowing the water-absorbing sponge to absorb the water in the limiting groove more stably.

[0013] Optionally, a mounting strip is provided on the mounting plate, a mounting groove connected to the limit groove is provided on the top plate, a stop strip is slidably connected in the mounting groove, and a stop hole for inserting the stop strip is provided on the limit strip; when the mounting strip is inserted into the mounting groove, the mounting strip drives the stop strip to be inserted into the stop hole, and at this time the limit strip is located in the limit groove.

[0014] By adopting the above technical solution, the mounting plate is installed on the top plate, and the mounting strip is inserted into the mounting groove. At this time, the mounting strip drives the stop strip to move, and the stop strip is inserted into the stop hole, so that the hole wall of the stop hole limits the stop strip, and the stop strip can limit the fixed plate to limit the position, so that the water-absorbing sponge can more stably abut the groove wall of the limiting groove, avoiding the long-term elastic deformation of the elastic strip, which causes the force of the elastic strip on the fixed plate to weaken.

[0015] Optionally, a stop spring is provided on the mounting groove, and the stop spring is provided on the stop bar, and the stop spring drives the stop bar to disengage from the stop hole.

[0016] By adopting the above technical solution, the staff removes the mounting plate from the top plate. At this time, the mounting bar disengages from the mounting groove, and the stop spring drives the stop bar to disengage from the stop hole, so that the stop bar releases the limit on the limit bar, allowing the limit bar to disengage from the limit groove, so that the staff can remove the fixed plate from the top plate.

[0017] Optionally, a stop plate is slidably connected in the fixed groove, a stop sponge is provided on the stop plate, a movable hole is opened in the fixed plate, a movable bar is slidably connected in the movable hole, and the movable bar is located on the side of the stop plate facing the bottom wall of the fixed groove; when the stop sponge is full of water, the stop plate drives the movable bar to protrude from the mounting plate.

[0018] By adopting the above technical solution, when rainwater enters the fixed groove, the stop sponge absorbs the rainwater. At this time, the weight of the stop sponge increases, causing the stop plate to slide toward the ground, thereby allowing the stop plate to drive the moving bar to move, causing the moving bar to protrude from the mounting plate, so that the staff can know the status of the stop sponge in time and replace the fixed plate.

[0019] Optionally, a receiving groove is provided on the fixing plate, a receiving spring is provided in the receiving groove, a receiving plate is provided on the receiving spring, and a receiving sponge is provided on the receiving plate; the receiving spring drives the receiving sponge to be located in the gap between the two top plates.

[0020] By adopting the above technical solution, the accommodating plate is driven to protrude from the accommodating groove by the accommodating spring, so that the accommodating sponge is located in the gap between the two top plates. When rainwater falls from the gap between the two top plates, the accommodating sponge can absorb the rainwater and reduce the amount of rainwater dripping into the fixed groove, thereby allowing the accommodating sponge to increase the total amount of rainwater stored in the fixed groove.

[0021] Optionally, a baffle is slidably connected to the fixed plate for blocking the accommodating groove, and a linkage bar is provided on the baffle, and the movable bar is located below the linkage bar; when the baffle blocks the accommodating groove, the movable bar abuts the linkage bar; when the movable bar protrudes from the mounting plate, the linkage bar falls, and the baffle does not block the accommodating groove.

[0022] By adopting the above technical solution, when the moving bar is located in the fixed plate, the moving bar abuts the linkage bar, so that the linkage bar cannot move. At this time, the baffle can block the accommodating groove, so that the baffle limits the accommodating plate from protruding from the accommodating groove, so that the accommodating sponge cannot absorb rainwater; when the moving bar protrudes from the mounting plate, the moving bar does not abut the linkage bar, so that the linkage bar can fall. At this time, the baffle does not block the opening of the accommodating groove, so that the accommodating spring drives the accommodating plate to protrude from the accommodating groove, so that the accommodating sponge can absorb rainwater dripping between the two top plates. When the stop sponge can no longer absorb rainwater, the accommodating sponge can absorb the dripping rainwater, so that rainwater cannot accumulate in the fixed groove, further preventing rainwater from affecting the normal use of the substation.

[0023] Optionally, a moving ring is slidably connected to the fixed plate, and the moving bar is rotatably connected to the moving ring. The moving bar can protrude from the mounting plate, and a moving block is provided on the moving bar. A ring groove for sliding the moving block is provided on the hole wall of the moving hole, and a through hole connecting the ring groove is provided on the fixed plate; when the moving bar protrudes from the mounting plate, the moving block is located in the ring groove.

[0024] By adopting the above technical solution, when the moving bar protrudes from the mounting plate, the moving block moves in the annular groove. At this time, the staff rotates the moving bar to move the moving block from the annular groove to the through-hole, so that the moving block can be separated from the fixed plate, thereby unlocking the fixed plate and the mounting plate from each other, so that the subsequent staff can remove the mounting plate from the fixed plate; by the moving block being located in the annular groove, the fixed plate limits the moving block, so that the fixed plate and the mounting plate can be fixed to each other, reducing the possibility of separation of the mounting plate and the fixed plate.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The fixing plate is set on the top plate, and the fixing groove is located between the two top plates. When it rains, rainwater flows into the fixing groove along the gap between the two top plates, so that the fixing groove can store rainwater, reduce the situation where rainwater continues to drip and affect the substation, and enable the substation to operate normally.

[0027] 2. Install it on the top plate through the mounting plate. At this time, the elastic strip is located on the side of the fixed plate away from the top plate, and the elastic strip is deformed toward the side away from the top plate, so that the elastic strip can drive the fixed plate to move toward the top plate, thereby making the gap between the water-absorbing sponge and the wall of the limiting groove smaller, making it difficult for rainwater to pass through the water-absorbing sponge, and allowing the water-absorbing sponge to absorb the water in the limiting groove more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of an embodiment of the present application;

[0029] Figure 2 It is along Figure 1 Partial cross-sectional view along line AA;

[0030] Figure 3 is an exploded schematic diagram highlighting the stop bar in an embodiment of the present application;

[0031] Figure 4 It is along Figure 1 Partial cross-sectional view of the midline BB;

[0032] Figure 5 yes Figure 2 A magnified schematic diagram of part C;

[0033] Figure 6 It is a structural diagram highlighting the linkage bar in the embodiment of the present application.

[0034] Reference numerals: 1, side panel; 11, bottom panel; 12, top panel; 13, fixing structure; 131, fixing bolt; 14, limiting groove; 15, mounting groove; 152, retaining spring; 153, retaining strip; 154, retaining inclined surface; 2, fixing plate; 21, fixing groove; 211, fixing spring; 212, retaining plate; 213, retaining sponge; 22, limiting strip; 221, absorbent sponge; 222, retaining hole; 2 3. Perforation; 24. Accommodating groove; 241. Accommodating spring; 242. Accommodating plate; 243. Accommodating sponge; 244. Accommodating strip; 25. Baffle; 251. Linkage strip; 252. Linkage groove; 3. Mounting plate; 31. Mounting strip; 32. Elastic strip; 33. Moving hole; 331. Moving ring; 332. Moving strip; 333. Moving block; 334. Moving inclined plane; 335. Ring groove; 336. Linkage block. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-6 This application is described in further detail.

[0036] This embodiment discloses a movable European high-voltage prefabricated substation. Figure 1 A movable European-style high-voltage prefabricated substation includes multiple side panels 1, multiple bottom panels 11, two top panels 12, and a fixing structure 13. The side panels 1 are located between the bottom panels 11 and the top panel 12, and the fixing structure 13 is used to secure and install the side panels 1, bottom panels 11, and top panels 12. The substation is movable by moving the multiple side panels 1, multiple bottom panels 11, and two top panels 12, and then splicing and installing the multiple side panels 1, multiple bottom panels 11, and two top panels 12.

[0037] Reference Figure 2 A fixing plate 2 is provided on the top plate 12, extending along the length of the substation. A fixing groove 21 is defined on the surface of the fixing plate 2, extending along the length of the fixing plate 2. Two limiting strips 22 are integrally formed on the surface of the fixing plate 2 where the fixing groove 21 is defined, extending along the length of the fixing plate 2. A water-absorbing sponge 221 is adhered to the surface of the limiting strips 22.

[0038] Reference Figure 2 A limiting groove 14 for inserting the limiting strip 22 is provided on the surface of the top plate 12 facing the ground. When the limiting strip 22 is inserted into the limiting groove 14, the absorbent sponge 221 abuts against the bottom wall of the limiting groove 14. At this time, the fixing groove 21 is located directly below the gap between the two top plates 12.

[0039] Reference Figure 1 and Figure 3Two mounting plates 3 are provided on the top plate 12, one on each side of the fixed plate 2. Two mounting bars 31 are fixedly connected to the surface of the mounting plates 3. Mounting slots 15 are defined on the surface of the top plate 12 for the mounting bars 31 to be inserted into. When the mounting bars 31 are inserted into the mounting slots 15, the mounting plates 3 are secured to the top plate 12. The fixing structure 13 includes a plurality of fixing bolts 131, which pass through the mounting plates 3 and are threadedly connected to the two top plates 12.

[0040] Reference Figure 3 A groove is formed on the groove wall of the limiting groove 14 on the same side as the mounting groove 15, and the groove is connected to the mounting groove 15. A retaining spring 152 is fixedly connected to the bottom wall of the groove. A retaining bar 153 is fixedly connected to the surface of the retaining spring 152 away from the bottom wall of the groove, and the retaining bar 153 can be inserted into the mounting groove 15. A retaining hole 222 is formed on the surface of the limiting bar 22 for inserting the retaining bar 153. The retaining spring 152 drives the retaining bar 153 out of the retaining hole 222. That is, when the retaining bar 153 is located in the retaining hole 222, the retaining spring 152 is in a stretched state; when the retaining bar 153 is located in the mounting groove 15, the retaining spring 152 is in a non-stressed state.

[0041] Reference Figure 3 A stopping slope 154 is provided on the surface of the stopping strip 153 facing the mounting groove 15. The distance between the stopping slope 154 and the stopping spring 152 gradually decreases along the insertion direction of the mounting strip 31, and the stopping slope 154 is located on the insertion path of the mounting strip 31.

[0042] Reference Figure 3 When the mounting strip 31 is inserted into the mounting groove 15 , the mounting strip 31 abuts against the stop bevel 154 , allowing the mounting strip 31 to push the stop strip 153 to move, so that the stop strip 153 is inserted into the stop hole 222 . At this time, the stop strip 153 restricts the limiting strip 22 from leaving the limiting groove 14 , allowing the fixing plate 2 to be fixed on the top plate 12 .

[0043] Reference Figure 3 An elastic strip 32 is fixedly connected to the surface of the mounting plate 3. When the mounting plate 3 is mounted on the fixing plate 2, the mounting strip 31 is inserted into the mounting groove 15. At this time, the elastic strip 32 is located on the side of the fixing plate 2 facing the ground. The elastic strip 32 deforms toward the ground, allowing the elastic strip 32 to drive the water-absorbing sponge 221 closer to the bottom wall of the limiting groove 14.

[0044] Reference Figure 2A plurality of fixing springs 211 are fixedly connected to the bottom wall of the fixing groove 21. The fixing springs 211 are formed into two groups, and the fixing springs 211 in each group are arranged in an array along the length of the fixing groove 21. A stopper plate 212 is provided on the fixing groove 21. The surface of the stopper plate 212 is fixedly connected to the surface of the fixing spring 211 away from the bottom wall of the fixing groove 21. A stopper sponge 213 is bonded to the surface of the stopper plate 212 away from the fixing spring 211. The stopper sponge 213 is capable of absorbing water.

[0045] Reference Figure 4 The mounting plate 3 has a movable hole 33 formed on its surface, into which a movable ring 331 is slidably connected. A movable bar 332 is rotatably connected to the movable ring 331. The fixed plate 2 has a movable hole 33 formed on its surface for the movable bar 332 to be inserted. When the mounting plate 3 is mounted on the fixed plate 2, the movable bar 332 does not protrude from the mounting plate 3.

[0046] Reference Figure 4 A moving block 333 is integrally formed on the surface of the moving bar 332. An annular groove 335 is defined in the wall of the moving hole 33, allowing the moving block 333 to slide. The annular groove 335 does not extend through the surface of the fixed plate 2. A through-hole 23 is defined on the surface of the fixed plate 2, connecting to the annular groove 335. The moving block 333 is inserted into the through-hole 23. The moving block 333 is inserted into the annular groove 335 through the through-hole 23. The operator then rotates the moving bar 332, securing it to the fixed plate 2.

[0047] Reference Figure 2 and Figure 4 A moving inclined surface 334 is provided on the surface of the moving bar 332 facing the fixed groove 21. When the moving bar 332 is placed in the moving hole 33, the moving bar 332 is affected by the gravity of the moving block 333. The distance between the moving inclined surface 334 and the fixed spring 211 gradually decreases along the direction from the stop plate 212 to the fixed spring 211, and the moving inclined surface 334 is located on the sliding path of the stop plate 212.

[0048] Reference Figure 4 When the stop sponge 213 is full of water, the weight of the stop sponge 213 increases, and the stop plate 212 pushes the moving bar 332 to move through the moving inclined surface 334, allowing the moving bar 332 to slide in the moving hole 33, allowing the moving bar 332 to protrude from the mounting plate 3.

[0049] Reference Figure 5A receiving strip 244 is integrally formed on the surface of the fixed plate 2. The receiving slot 24 is formed in the wall of the fixed slot 21 and extends through the receiving strip 244. Multiple receiving springs 241 are fixedly connected to the bottom wall of the receiving slot 24. These springs 241 are arranged in an array along the length of the fixed plate 2. A receiving plate 242 is positioned within the receiving slot 24. Its surface is fixedly connected to the surface of the receiving springs 241 facing away from the bottom wall of the receiving slot 24. A receiving sponge 243 is fixedly connected to the surface of the receiving plate 242 facing away from the receiving springs 241. The receiving sponge 243 absorbs moisture. The receiving springs 241 drive the receiving plate 242 directly below the gap between the two top plates 12. When the receiving plate 242 is directly below the gap between the two top plates 12, the receiving springs 241 are unloaded. When the receiving plate 242 is within the receiving slot 24, the receiving springs 241 are compressed.

[0050] Reference Figure 5 and Figure 6 A baffle 25 is slidably connected to the surface of the fixed plate 2. The baffle 25 is used to block the opening of the receiving slot 24. A linkage slot 252 is formed on the surface of the fixed plate 2 and communicates with the movable hole 33. A linkage bar 251 is fixedly connected to the surface of the baffle 25 and slidably connected to the linkage slot 252. A linkage block 336 is fixedly connected to the outer surface of the movable bar 332 and is located in the sliding path of the linkage bar 251.

[0051] Reference Figure 5 and Figure 6 The linkage bar 251 has a linkage slope on its surface. The distance between the linkage slope and the ground gradually decreases along the insertion direction of the moving bar 332. The linkage slope is located on the insertion path of the linkage block 336. When the moving bar 332 is inserted into the fixed plate 2, the linkage block 336 drives the linkage bar 251 to move via the linkage slope due to the gravity of the moving block 333.

[0052] Reference Figure 4 、 Figure 5 and Figure 6 When the mounting plate 3 is mounted on the fixed plate 2, the linkage bar 251 abuts the side of the linkage block 336 away from the ground. This, combined with the frictional force on the linkage bar 251, allows the linkage bar 251 to be fixed, and the baffle 25 now blocks the opening of the receiving slot 24. When the movable bar 332 protrudes from the mounting plate 3, the linkage block 336 no longer abuts the linkage bar 251. Gravity forces the linkage bar 251 downward, freeing the baffle 25 from blocking the opening of the receiving slot 24. This allows the receiving spring 241 to drive the receiving plate 242 outward, allowing the receiving sponge 243 to absorb rainwater falling from the gap between the two top plates 12.

[0053] The implementation principle of a movable European high-voltage prefabricated substation in an embodiment of the present application is as follows: the staff first tightens the fixing bolt 131, the staff rotates the moving bar 332, and moves the moving block 333 from the annular groove 335 to the through-hole 23. At this time, the staff pulls the moving bar 332 to disengage the moving bar 332 from the through-hole 23, and then the staff takes out the mounting bar 31 from the mounting groove 15. At this time, the fixing spring 211 drives the stop bar 153 to disengage from the stop hole 222, so that the stop bar 153 releases the limit on the limit bar 22, and the staff can take the fixed plate 2 out of the top plate 12 to replace the fixed plate 2.

[0054] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprises" cover the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0055] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the design concept of the present application should be included in the scope of protection of the present application.

Claims

1. A movable European high-voltage prefabricated substation, comprising a plurality of side panels (1), a plurality of bottom panels (11), two top panels (12) and a fixing structure (13), wherein the fixing structure (13) is used to install the plurality of side panels (1), the plurality of bottom panels (11) and the two top panels (12), and is characterized in that: A fixing plate (2) is provided on the top plate (12), a fixing groove (21) is provided on the fixing plate (2), and the fixing groove (21) is located between the two top plates (12); The fixing plate (2) is provided with a limiting strip (22), the top plate (12) is provided with a limiting groove (14) for the limiting strip (22) to be inserted, and the limiting strip (22) is provided with a water-absorbing sponge (221); when the limiting strip (22) is inserted into the limiting groove (14), the water-absorbing sponge (221) abuts against the groove wall of the limiting groove (14); The top plate (12) is provided with a mounting plate (3), and the mounting plate (3) is provided with an elastic strip (32), and the elastic strip (32) is located on a side of the fixing plate (2) away from the top plate (12); when the mounting plate (3) is mounted on the top plate (12), the elastic strip (32) is deformed toward the side away from the top plate (12); The mounting plate (3) is provided with a mounting strip (31), the top plate (12) is provided with a mounting groove (15) connected to the limiting groove (14), a stop strip (153) is slidably connected in the mounting groove (15), and the limiting strip (22) is provided with a stop hole (222) for inserting the stop strip (153); when the mounting strip (31) is inserted into the mounting groove (15), the mounting strip (31) drives the stop strip (153) to be inserted into the stop hole (222), and at this time the limiting strip (22) is located in the limiting groove (14); A stop spring (152) is provided on the mounting groove (15), and the stop spring (152) is provided on the stop bar (153). The stop spring (152) drives the stop bar (153) to disengage from the stop hole (222); A stop plate (212) is slidably connected in the fixed groove (21), a stop sponge (213) is provided on the stop plate (212), a moving hole (33) is opened on the fixed plate (2), a moving bar (332) is slidably connected in the moving hole (33), and the moving bar (332) is located on the side of the stop plate (212) facing the bottom wall of the fixed groove (21); when the stop sponge (213) is full of water, the stop plate (212) drives the moving bar (332) to protrude from the mounting plate (3).

2. The movable European-style high-voltage prefabricated substation according to claim 1, characterized in that: The fixing plate (2) is provided with a receiving groove (24), a receiving spring (241) is provided in the receiving groove (24), a receiving plate (242) is provided on the receiving spring (241), and a receiving sponge (243) is provided on the receiving plate (242); the receiving spring (241) drives the receiving sponge (243) to be located in the gap between the two top plates (12).

3. The movable European-style high-voltage prefabricated substation according to claim 2, characterized in that: A baffle (25) for blocking the receiving groove (24) is slidably connected to the fixed plate (2), and a linkage bar (251) is provided on the baffle (25), and the movable bar (332) is located below the linkage bar (251); when the baffle (25) blocks the receiving groove (24), the movable bar (332) abuts against the linkage bar (251); when the movable bar (332) protrudes from the mounting plate (3), the linkage bar (251) falls, and the baffle (25) does not block the receiving groove (24).

4. The movable European-style high-voltage prefabricated substation according to claim 1 is characterized in that: A moving ring (331) is slidably connected to the fixed plate (2), the moving strip (332) is rotatably connected to the moving ring (331), the moving strip (332) is capable of protruding from the mounting plate (3), a moving block (333) is provided on the moving strip (332), a ring groove (335) for sliding the moving block (333) is provided on the hole wall of the moving hole (33), and a through hole (23) communicating with the ring groove (335) is provided on the fixed plate (2); when the moving strip (332) protrudes from the mounting plate (3), the moving block (333) is located in the ring groove (335).

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