A marine stop valve

Abstract

The present invention relates to the field of valve technology, specifically to a marine stop valve, which mainly comprises a valve body, a connecting pipe connected to the upper flange of the valve body, two baffles fixedly installed on the inner wall of the valve body, baffles fixedly installed on the sides of the two baffles, a valve disc arranged above the baffle, a sealing mechanism arranged above the baffle, and an extrusion mechanism arranged outside the valve disc. When the device is sealed by the valve disc, the sealing groove on the round frame is driven to abut and seal with the sealing ring in the groove body, thereby performing secondary sealing on the device, and the valve disc drives the rubber frame to contact and seal with the sealing frame at the same time, the L-shaped plate pushes the moving ring to move downward, the moving ring drives the moving plate and the T-shaped block to move downward, the T-shaped block moves downward and moves horizontally at the same time, the T-shaped block drives the L-shaped rod to rotate, and the L-shaped rod drives the pressure head to press the rubber frame, so that the contact between the rubber frame and the sealing frame is tighter, the sealing quality between the rubber frame and the sealing frame is improved, the risk of leakage is reduced, and the safety of the operating environment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a marine stop valve. Background Art

[0002] Marine stop valve is a type of stop valve. Marine stop valve is mainly used in shipbuilding. It has a more significant effect in resisting the corrosion of seawater. It is very different from the stop valves made of general materials. The stop valve is also a forced sealing valve.

[0003] The Chinese patent publication number CN220435428U discloses a marine stop valve, which is easy to pass through the filter screen to prevent large particle pollutants from entering the marine stop valve and causing damage to the marine stop valve. Through the second threaded hole and the third positioning bolt, it is easy for users to replace the filter screen.

[0004] However, in actual operation, the device only relies on the valve core for simple sealing. Although this design seems simple and effective, it has certain safety hazards. When the valve core is damaged or worn, the sealing performance of the entire device will be greatly reduced, thereby increasing the risk of leakage. Due to the lack of other effective sealing measures, this situation may lead to a significant increase in the insecurity of the operating environment.

[0005] Therefore, a marine stop valve is proposed. Summary of the invention

[0006] The object of the present invention is to provide a marine stop valve to solve the problem raised in the above background technology that when the valve core is damaged or worn, the sealing performance of the entire device will be greatly reduced, thereby increasing the risk of leakage.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A marine stop valve, comprising: a valve body, the upper end flange of the valve body is connected to a connecting pipe, the inner wall of the valve body is fixedly mounted with two baffles, the sides of the two baffles are fixedly mounted with blocks, and a valve flap is arranged above the baffle;

[0009] A sealing mechanism is arranged above the stopper, the sealing mechanism comprises a rubber frame fixedly mounted on the outer wall of the valve disc, and a sealing frame is fixedly mounted on the top surface of the stopper for sealing the valve disc;

[0010] The extrusion mechanism is arranged on the outside of the valve disc, and the extrusion mechanism includes an arc-shaped plate arranged on the outside of the valve disc, which is used for extruding and sealing the rubber frame.

[0011] Preferably, a flow channel is opened through the top surface of the block, the outer wall of the lower end of the valve flap is slidably connected to the inner wall of the flow channel, a valve stem is fixedly installed on the top surface of the valve flap, the upper end of the valve stem slides through the bottom surface of the connecting pipe and extends to above the connecting pipe, and the upper end of the valve stem is connected to a handle via a screw.

[0012] Preferably, a bellows is fixedly mounted on the top surface of the valve disc, a mounting frame is fixedly mounted on the upper end of the bellows, and the top surface of the mounting frame is fixedly connected to the bottom surface of the connecting pipe.

[0013] Preferably, a groove body is provided on the top surface of the block, a sealing ring is fixedly installed on the inner wall of the lower end of the groove body, a circular frame is fixedly installed on the bottom surface of the valve disc, a sealing groove is provided on the bottom surface of the circular frame, and the inner wall of the sealing groove is movably connected to the outer wall of the sealing ring.

[0014] Preferably, the outer wall of the sealing frame is slidably connected to the inner wall of the rubber frame, a movable groove is opened on the top surface of the block, a movable ring is slidably connected to the inner wall of the movable groove, a plurality of movable plates are integrally installed on the outer wall of the movable ring, the outer walls of the plurality of movable plates are slidably connected to the inner wall of the movable groove, a plurality of elastic parts are fixedly installed on the bottom surface of the movable ring, and a lower end of the plurality of elastic parts is fixedly connected to the inner wall of the lower end of the movable groove.

[0015] Preferably, the top surfaces of the plurality of movable plates are respectively provided with T-shaped grooves, the inner walls of the plurality of T-shaped grooves are respectively slidably connected with T-shaped blocks, the inner walls of the plurality of T-shaped blocks are respectively hinged with L-shaped rods, and the middle side surfaces of the plurality of L-shaped rods are hinged to the inner walls of the movable grooves.

[0016] Preferably, pressure heads are fixedly mounted on the upper ends of the plurality of L-shaped rods, the outer walls of the plurality of pressure heads are movably connected to the outer wall of the rubber frame, the outer wall of the valve disc is fixedly mounted with a plurality of L-shaped plates, and the bottom surfaces of the plurality of L-shaped plates are in contact with the top surface of the movable plate.

[0017] Preferably, through holes are respectively opened on the side surfaces of the multiple L-shaped plates, and the inner walls of the multiple through holes are slidably connected with wedge plates respectively. Multiple arc-shaped plates are provided, and the outer walls of the multiple arc-shaped plates are respectively fixedly connected to one end of the multiple wedge plates, and the inner walls of the multiple arc-shaped plates are in contact with the outer wall of the rubber frame.

[0018] Preferably, a limiting plate is fixedly installed on both side surfaces of the plurality of wedge-shaped plates, a limiting groove is provided on the inner walls of the plurality of through holes, an outer wall of the plurality of limiting plates is slidingly connected to the inner walls of the plurality of limiting grooves, an elastic member 2 is fixedly installed on the side surfaces of the plurality of limiting plates, and the other ends of the plurality of elastic members 2 are fixedly connected to the inner walls of the plurality of limiting grooves.

[0019] Preferably, the side surfaces of the multiple L-shaped plates are respectively provided with sliding grooves, the inner walls of the multiple sliding grooves are respectively slidably connected with sliding frames, the inner walls of the multiple sliding frames are respectively slidably connected with the outer walls of the multiple L-shaped plates, the side surfaces of the multiple sliding frames are respectively slidably connected with the side surfaces of the multiple wedge-shaped plates, and the bottom surfaces of the multiple sliding frames are in contact with the top surface of the block.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] When the valve disc seals the device, the present invention drives the sealing groove on the circular frame to abut and seal with the sealing ring in the groove body, thereby performing secondary sealing on the device, and the valve disc drives the rubber frame to contact and seal with the sealing frame at the same time, the L-shaped plate pushes the moving ring to move downward, the moving ring drives the moving plate and the T-shaped block to move downward, the T-shaped block moves downward and moves horizontally at the same time, the T-shaped block drives the L-shaped rod to rotate, and the L-shaped rod drives the pressure head to press the rubber frame, so that the contact between the rubber frame and the sealing frame is tighter, and the sealing quality between the rubber frame and the sealing frame is improved. When the valve disc is damaged or worn, the sealing performance of the entire device can still be guaranteed, thereby reducing the risk of leakage and improving the safety of the operating environment.

[0022] When the L-shaped plate is driven downward by the valve disc, the L-shaped plate drives the sliding frame downward. When the lower end of the sliding frame contacts the top surface of the stopper, the L-shaped plate continues to move downward, and the sliding frame moves up relative to the L-shaped plate. The sliding frame pushes the wedge-shaped plate to move. The movement of the wedge-shaped plate drives the arc plate to move at the same time. The inner wall of the arc plate squeezes the outer wall of the rubber frame, thereby further ensuring the sealing quality between the sealing frame and the rubber frame and improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 It is a schematic cross-sectional view of the three-dimensional structure of the present invention;

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the valve disc of the present invention;

[0026] Figure 4 For the present invention Figure 2 Enlarged view of point A in the middle;

[0027] Figure 5 It is a partial three-dimensional structure explosion diagram of the present invention;

[0028] Figure 6 It is a cross-sectional schematic diagram of the three-dimensional structure of the stopper of the present invention;

[0029] Figure 7 It is a schematic bottom view of the three-dimensional structure of the valve flap of the present invention;

[0030] Figure 8For the present invention Figure 6 Enlarged view of point B in the middle;

[0031] Fig. 9 It is an exploded view of the three-dimensional structure of the through hole of the present invention;

[0032] Fig.10 It is a top cross-sectional view of the L-shaped plate three-dimensional structure of the present invention.

[0033] In the figure:

[0034] 1. Valve body; 101. Connecting pipe; 102. Baffle; 103. Stopper; 104. Valve stem; 105. Handle; 106. Valve disc;

[0035] 2. Sealing mechanism; 201. Groove body 1; 202. Sealing ring; 203. Round frame; 204. Sealing groove; 205. Sealing frame; 206. Rubber frame; 207. Moving groove; 208. Moving ring; 209. Moving plate; 210. Elastic member 1; 211. T-shaped groove; 212. T-shaped block; 213. L-shaped rod; 214. Press head; 215. L-shaped plate;

[0036] 3. Extrusion mechanism; 301. Through hole; 302. Wedge plate; 303. Arc plate; 304. Limiting plate; 305. Limiting groove; 306. Elastic member 2; 307. Slide groove; 308. Slide frame;

[0037] 4. Bellows; 5. Installation frame. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0040] like Figure 1-10 As shown, the present application provides a marine stop valve, including a valve body 1, a connecting pipe 101 is connected to the upper flange of the valve body 1, two baffles 102 are fixedly installed on the inner wall of the valve body 1, baffles 103 are fixedly installed on the sides of the two baffles 102, and a valve flap 106 is arranged above the baffle 102;

[0041] Specifically, Figure 1-3As shown, a flow channel is opened through the top surface of the block 103, the outer wall of the lower end of the valve flap 106 is slidably connected to the inner wall of the flow channel, a valve stem 104 is fixedly installed on the top surface of the valve flap 106, the upper end of the valve stem 104 slides through the bottom surface of the connecting pipe 101 and extends to the top of the connecting pipe 101, and the upper end of the valve stem 104 is connected to a handle 105 through a screw.

[0042] In this embodiment, the device can be sealed by the cooperation between the valve flap 106 and the flow channel.

[0043] Specifically, Figure 1-3 As shown, a bellows 4 is fixedly mounted on the top surface of the valve flap 106 , a mounting frame 5 is fixedly mounted on the upper end of the bellows 4 , and the top surface of the mounting frame 5 is fixedly connected to the bottom surface of the connecting pipe 101 .

[0044] In this embodiment, by providing the bellows 4 and the mounting frame 5 , the bellows 4 can seal the valve stem 104 and the connecting pipe 101 , thereby ensuring that the fluid in the valve body 1 is not easily leaked outward.

[0045] The sealing mechanism 2 is arranged above the stopper 103. The sealing mechanism 2 comprises a rubber frame 206 fixedly mounted on the outer wall of the valve disc 106. A sealing frame 205 is fixedly mounted on the top surface of the stopper 103 for sealing the valve disc 106.

[0046] Specifically, Figure 1-8 As shown, a groove body 201 is formed on the top surface of the stopper 103, a sealing ring 202 is fixedly installed on the inner wall of the lower end of the groove body 201, a round frame 203 is fixedly installed on the bottom surface of the valve flap 106, a sealing groove 204 is formed on the bottom surface of the round frame 203, and the inner wall of the sealing groove 204 is movably connected to the outer wall of the sealing ring 202.

[0047] In this embodiment, the device can be further sealed by the cooperation between the sealing groove 204 on the bottom surface of the circular frame 203 and the sealing ring 202 on the inner wall of the groove body 201. When the valve flap 106 is worn, the device can still be sealed and leakage is not likely to occur.

[0048] Specifically, Figure 1-8 As shown, the outer wall of the sealing frame 205 is slidably connected to the inner wall of the rubber frame 206, a movable groove 207 is opened on the top surface of the stopper 103, and a movable ring 208 is slidably connected to the inner wall of the movable groove 207. A plurality of movable plates 209 are integrally installed on the outer wall of the movable ring 208, and the outer walls of the plurality of movable plates 209 are slidably connected to the inner wall of the movable groove 207. A plurality of elastic members 210 are fixedly installed on the bottom surface of the movable ring 208, and the lower ends of the plurality of elastic members 210 are fixedly connected to the inner wall of the lower end of the movable groove 207.

[0049] In this embodiment: elastic force is applied to the moving ring 208 by setting the elastic member 210, so that the moving ring 208 is kept at a certain height when not sealed, and the outer wall of the sealing frame 205 is slidably connected with the inner wall of the rubber frame 206, thereby sealing the device multiple times to further improve the safety of the device.

[0050] Specifically, Figure 1-8 As shown, the top surfaces of the multiple movable plates 209 are respectively provided with T-shaped grooves 211, the inner walls of the multiple T-shaped grooves 211 are respectively slidably connected with T-shaped blocks 212, the inner walls of the multiple T-shaped blocks 212 are respectively hinged with L-shaped rods 213, and the middle sides of the multiple L-shaped rods 213 are hinged to the inner walls of the movable grooves 207.

[0051] In this embodiment, when the moving ring 208 moves, the moving plate 209 is driven to move, and when the moving plate 209 moves, the T-shaped block 212 is driven to move, and the T-shaped block 212 drives the L-shaped rod 213 to rotate, thereby driving the transmission of the subsequent structure.

[0052] Specifically, Figure 1-8 As shown, a plurality of L-shaped rods 213 are respectively fixedly mounted with pressure heads 214 at their upper ends, the outer walls of the plurality of pressure heads 214 are movably connected to the outer wall of the rubber frame 206 , a plurality of L-shaped plates 215 are fixedly mounted on the outer wall of the valve flap 106 , and the bottom surfaces of the plurality of L-shaped plates 215 abut against the top surface of the movable plate 209 .

[0053] In this embodiment: when the L-shaped plate 215 moves downward to push the moving ring 208 and the moving plate 209 to move, the moving plate 209 drives the L-shaped rod 213 to rotate through the T-shaped block 212, and the other end of the L-shaped rod 213 squeezes the rubber frame 206 through the pressure head 214, so that the rubber frame 206 is in close contact with the sealing frame 205, thereby improving the sealing and safety of the device.

[0054] The squeezing mechanism 3 is arranged outside the valve flap 106 . The squeezing mechanism 3 includes an arc-shaped plate 303 arranged outside the valve flap 106 and used for squeezing and sealing the rubber frame 206 .

[0055] Specifically, Figure 1-10 As shown, through holes 301 are respectively opened on the sides of the multiple L-shaped plates 215, and the inner walls of the multiple through holes 301 are slidably connected with wedge plates 302 respectively. Multiple arc plates 303 are provided, and the outer walls of the multiple arc plates 303 are respectively fixedly connected to one end of the multiple wedge plates 302, and the inner walls of the multiple arc plates 303 are in contact with the outer wall of the rubber frame 206.

[0056] In this embodiment, the wedge plate 302 is limited by the through hole 301 , the wedge plate 302 drives the arc plate 303 to move, and the arc plate 303 abuts against the rubber frame 206 again, further improving the sealing effect between the rubber frame 206 and the sealing frame 205 .

[0057] Specifically, Figure 1-10 As shown, the two side surfaces of the multiple wedge plates 302 are respectively fixedly installed with limiting plates 304, the inner walls of the multiple through holes 301 are respectively provided with limiting grooves 305, the outer walls of the multiple limiting plates 304 are respectively slidably connected with the inner walls of the multiple limiting grooves 305, and the sides of the multiple limiting plates 304 are respectively fixedly installed with elastic parts 306, and the other ends of the multiple elastic parts 306 are respectively fixedly connected with the inner walls of the multiple limiting grooves 305.

[0058] In this embodiment, the wedge plate 302 can be limited by the setting of the limiting groove 305 and the limiting plate 304. At the same time, the setting of the elastic member 306 applies elastic force to the limiting plate 304 to ensure that the wedge plate 302 drives the arc plate 303 to move.

[0059] Specifically, Figure 1-10 As shown, the sides of the multiple L-shaped plates 215 are respectively provided with sliding grooves 307, the inner walls of the multiple sliding grooves 307 are respectively slidably connected with sliding frames 308, the inner walls of the multiple sliding frames 308 are respectively slidably connected to the outer walls of the multiple L-shaped plates 215, the sides of the multiple sliding frames 308 are respectively slidably connected to the sides of the multiple wedge-shaped plates 302, and the bottom surfaces of the multiple sliding frames 308 abut against the top surface of the stop block 103.

[0060] In this embodiment: when the sliding frame 308 contacts the stopper 103, the L-shaped plate 215 continues to move downward, the sliding frame 308 and the L-shaped plate 215 move relative to each other, the sliding frame 308 pushes the wedge plate 302 to move, the wedge plate 302 drives the arc plate 303 to move, and the arc plate 303 squeezes and seals the rubber frame 206, thereby improving the sealing and safety of the device.

[0061] The specific solution is as follows: when the valve flap 106 seals the device, it drives the sealing groove 204 on the circular frame 203 to abut and seal with the sealing ring 202 in the groove body 201, thereby performing secondary sealing on the device, and the valve flap 106 drives the rubber frame 206 to contact and seal with the sealing frame 205, while the L-shaped plate 215 pushes the moving ring 208 to move downward, and the moving ring 208 drives the moving plate 209 and the T-shaped block 212 to move downward, and the T-shaped block 212 moves downward and horizontally at the same time, and the T-shaped block 212 drives the L-shaped rod 213 to rotate, and the L-shaped rod 213 drives the pressure head 214 to press the rubber frame 206, so that the contact between the rubber frame 206 and the sealing frame 205 is closer, thereby improving the contact between the rubber frame 206 and the sealing frame 205. The sealing quality between them can still be guaranteed when the valve flap 106 is damaged or worn, thereby reducing the risk of leakage and improving the safety of the operating environment. At the same time, when the valve flap 106 drives the L-shaped plate 215 to move downward, the L-shaped plate 215 drives the sliding frame 308 to move downward. When the lower end of the sliding frame 308 contacts the top surface of the stopper 103, the L-shaped plate 215 continues to move downward, and the sliding frame 308 moves upward relative to the L-shaped plate 215. The sliding frame 308 pushes the wedge plate 302 to move. The movement of the wedge plate 302 drives the arc plate 303 to move at the same time. The inner wall of the arc plate 303 squeezes the outer wall of the rubber frame 206, further ensuring the sealing quality between the sealing frame 205 and the rubber frame 206 and improving the safety of the device.

[0062] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary; within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0063] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A marine stop valve, comprising: A valve body (1), wherein the upper end flange of the valve body (1) is connected to a connecting pipe (101), two baffles (102) are fixedly mounted on the inner wall of the valve body (1), baffles (103) are fixedly mounted on the sides of the two baffles (102), and a valve flap (106) is arranged above the baffle (102), characterized in that: A sealing mechanism (2) is arranged above the stopper (103), the sealing mechanism (2) comprising a rubber frame (206) fixedly mounted on the outer wall of the valve disc (106), and a sealing frame (205) is fixedly mounted on the top surface of the stopper (103) for sealing the valve disc (106); A squeezing mechanism (3) is arranged outside the valve flap (106), the squeezing mechanism (3) comprising an arc-shaped plate (303) arranged outside the valve flap (106) and used for squeezing and sealing the rubber frame (206); The outer wall of the sealing frame (205) is slidably connected to the inner wall of the rubber frame (206); a moving groove (207) is provided on the top surface of the stopper (103); a moving ring (208) is slidably connected to the inner wall of the moving groove (207); a plurality of moving plates (209) are integrally mounted on the outer wall of the moving ring (208); the outer walls of the plurality of moving plates (209) are slidably connected to the inner wall of the moving groove (207); a plurality of elastic members (210) are fixedly mounted on the bottom surface of the moving ring (208); the lower ends of the plurality of elastic members (210) are fixedly connected to the inner wall of the lower end of the moving groove (207); The top surfaces of the plurality of movable plates (209) are respectively provided with T-shaped grooves (211), the inner walls of the plurality of T-shaped grooves (211) are respectively slidably connected with T-shaped blocks (212), the inner walls of the plurality of T-shaped blocks (212) are respectively hinged with L-shaped rods (213), and the middle side surfaces of the plurality of L-shaped rods (213) are hinged to the inner walls of the movable grooves (207).

2. A marine stop valve according to claim 1, characterized in that: A flow channel is formed through the top surface of the stopper (103); the outer wall of the lower end of the valve flap (106) is slidably connected to the inner wall of the flow channel; a valve stem (104) is fixedly mounted on the top surface of the valve flap (106); the upper end of the valve stem (104) slides through the bottom surface of the connecting pipe (101) and extends to the top of the connecting pipe (101); the upper end of the valve stem (104) is connected to a handle (105) via a screw.

3. A marine stop valve according to claim 1, characterized in that: A bellows (4) is fixedly mounted on the top surface of the valve flap (106), a mounting frame (5) is fixedly mounted on the upper end of the bellows (4), and the top surface of the mounting frame (5) is fixedly connected to the bottom surface of the connecting pipe (101).

4. A marine stop valve according to claim 1, characterized in that: A groove body (201) is provided on the top surface of the stopper (103), a sealing ring (202) is fixedly mounted on the inner wall of the lower end of the groove body (201), a round frame (203) is fixedly mounted on the bottom surface of the valve flap (106), a sealing groove (204) is provided on the bottom surface of the round frame (203), and the inner wall of the sealing groove (204) is movably connected to the outer wall of the sealing ring (202).

5. A marine stop valve according to claim 1, characterized in that: A pressure head (214) is fixedly mounted on the upper ends of the plurality of L-shaped rods (213), the outer walls of the plurality of pressure heads (214) are movably connected to the outer wall of the rubber frame (206), and a plurality of L-shaped plates (215) are fixedly mounted on the outer wall of the valve flap (106), and the bottom surfaces of the plurality of L-shaped plates (215) are in contact with the top surface of the movable plate (209).

6. A marine stop valve according to claim 5, characterized in that: Through holes (301) are respectively opened through the side surfaces of the plurality of L-shaped plates (215), the inner walls of the plurality of through holes (301) are respectively slidably connected with wedge-shaped plates (302), a plurality of arc-shaped plates (303) are provided, the outer walls of the plurality of arc-shaped plates (303) are respectively fixedly connected to one end of the plurality of wedge-shaped plates (302), and the inner walls of the plurality of arc-shaped plates (303) are in contact with the outer wall of the rubber frame (206).

7. A marine stop valve according to claim 6, characterized in that: Limiting plates (304) are fixedly mounted on both sides of the plurality of wedge-shaped plates (302), limiting grooves (305) are respectively provided on the inner walls of the plurality of through holes (301), outer walls of the plurality of limiting plates (304) are respectively slidably connected to the inner walls of the plurality of limiting grooves (305), elastic members (2) (306) are fixedly mounted on the sides of the plurality of limiting plates (304), and the other ends of the plurality of elastic members (2) (306) are respectively fixedly connected to the inner walls of the plurality of limiting grooves (305).

8. A marine stop valve according to claim 7, characterized in that: The side surfaces of the plurality of L-shaped plates (215) are respectively provided with sliding grooves (307), the inner walls of the plurality of sliding grooves (307) are respectively slidably connected with sliding frames (308), the inner walls of the plurality of sliding frames (308) are respectively slidably connected with the outer walls of the plurality of L-shaped plates (215), the side surfaces of the plurality of sliding frames (308) are respectively slidably connected with the side surfaces of the plurality of wedge-shaped plates (302), and the bottom surfaces of the plurality of sliding frames (308) are in contact with the top surface of the stopper (103).

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