Wastewater treatment device for desulfurizing tower

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to a wastewater treatment device for a desulfurizing tower, which comprises a barrel, a driving device is mounted at the top end of the barrel, a seed crystal filling piece is mounted on the inner wall of the barrel, a drainage body is mounted on the inner side of the seed crystal filling piece, and a wastewater drainage pipe is mounted at one end of the barrel in an embedded manner. A rotating shaft is installed at the driving end of the driving device, a drainage part is installed at the end, extending to the inner side of the drainage body, of the rotating shaft, a water flow outlet is formed in the other side of the barrel, the barrel comprises an upper barrel body and a lower barrel body, and two sets of connecting columns are installed between the upper barrel body and the lower barrel body; two groups of mounting plates are connected between the upper cylinder body and the lower cylinder body in a sliding manner; according to the utility model, the structure is simple, the operation is convenient, and a worker can complete the quick dismounting operation by pressing and pulling, so that an aged filter screen can be replaced or a blocked part can be cleaned, and the subsequent sewage treatment effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a wastewater treatment device for a desulfurization tower. Background Art

[0002] With the rapid development of social economy, people's awareness of environmental protection is getting stronger and stronger, and the application of desulfurization towers is becoming more and more extensive. The so-called desulfurization tower is a tower equipment for desulfurization of industrial waste gas. The desulfurization tower was originally built with granite and was the most widely used. It uses the principle of water film desulfurization and dust removal. It is also called granite water film desulfurization dust collector, or granite water film desulfurization dust collector. The advantage is that it is easy to maintain, and different dust removal agents can be prepared to achieve the effect of dust removal and desulfurization (denitrification). Now with the development of glass fiber reinforced plastic technology, desulfurization towers are gradually changed to glass fiber reinforced plastics. Compared with granite desulfurization, Tower, FRP desulfurization tower has low cost, easy processing, no rust, and light weight, so it will become the development trend of desulfurization tower in the future. In addition, 316L stainless steel has three advantages of corrosion resistance, high temperature resistance, and wear resistance, which is also one of the important development trends of desulfurization tower. After years of improvement, it has developed into various types of desulfurization towers such as Venturi type, swirl plate type, swirl column type, float type, sieve plate type, and pneumatic emulsification type. The equipment technology is becoming more and more mature, and each has its own advantages and disadvantages. Most of my country's coal-fired power plants use limestone-stone sound method (wet method) flue gas desulfurization process for desulfurization of sulfur-containing flue gas. In the desulfurization tower, the limestone slurry spray reacts chemically with sulfur oxides (S02, S03) in the flue gas to generate desulfurization gypsum, and a large amount of desulfurization wastewater is generated at the same time. Desulfurization wastewater contains a large amount of calcium ions (Ca2+) and sulfate ions (S042-); unlike wastewater from other fields, desulfurization wastewater is very easy to scale on the treatment equipment and pipe walls during conventional treatment, causing great harm to the equipment, not only shortening the service life of the equipment, but also increasing the operating and maintenance costs of the desulfurization treatment.

[0003] In order to solve the above technical problems, a Chinese patent with announcement number CN213651888U in the prior art discloses a wastewater treatment device for a desulfurization tower and a desulfurization tower: comprising: a body, which is arranged at the place of use, and a water inlet and a water outlet are arranged on the side wall of the body; a drainage body, which is connected to the inner wall of the body through a seed filling member, and the drainage body is a hollow structure with upper and lower parts, and the upper and lower parts of the drainage body are not in contact with the top and bottom of the inner side of the body respectively; a driving device, which is arranged on the top of the body; a rotating shaft: one end of which is connected to the driving device.

[0004] Although the above-mentioned existing technical solution avoids the increase in operating costs in the desulfurization treatment due to scaling problems, its filter element is directly arranged between the body and the drainage body, and is the first to contact the sewage. Impurities in the sewage are intercepted by it. After a period of use, the intercepted impurities will accumulate in various places of the filter element, blocking its holes, and it is difficult for the staff to reach into the body for detailed cleaning, nor can it be quickly disassembled for cleaning, which affects the sewage treatment effect of the filter element in the subsequent process. Utility Model Content

[0005] The purpose of the utility model is to provide a wastewater treatment device for a desulfurization tower to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A wastewater treatment device for a desulfurization tower comprises a cylinder, a driving device is installed at the top of the cylinder, a seed filling piece is installed on the inner wall of the cylinder, a drainage body is installed on the inner side of the seed filling piece, a wastewater drainage pipe is embedded in one end of the cylinder, a rotating shaft is installed on the driving end of the driving device, a drainage part is installed on one end of the rotating shaft extending to the inner side of the drainage body, and a water flow outlet is installed on the other side of the cylinder, the cylinder comprises an upper cylinder and a lower cylinder, two groups of connecting columns are installed between the upper cylinder and the lower cylinder, two groups of mounting plates are slidably connected between the upper cylinder and the lower cylinder, the two groups of mounting plates are clamped by a splicing assembly, a mounting frame is installed on the inner side of the mounting plate by a locking assembly, a filter screen is installed on one side of the mounting frame, the locking assembly comprises a connecting assembly, a positioning assembly and a buckle and pull assembly, the connecting assembly is used to connect and splice the mounting frame and the filter screen on the mounting plate, the positioning assembly is used to clamp and extrude the connecting assembly, and the buckle and pull assembly is used to release the position fixation of the mounting frame and the filter screen.

[0008] As a preferred solution of the utility model, the connecting assembly includes a rubber pad embedded and installed on one side of the mounting frame, a through hole is opened inside the rubber pad, a connecting block is installed on one side of the mounting frame at the through hole, a connecting groove is opened on the side of the mounting plate close to the mounting frame, the connecting block and the connecting groove are slidably connected, and an extrusion groove is opened inside the mounting plate on one side of the connecting groove.

[0009] As a preferred solution of the utility model, limiting seats are installed at both ends of the inner side of the extrusion groove, extrusion blocks are overlapped at both ends of the top of the limiting seats, fixing grooves are provided at the bottom ends of the opposite surfaces of the extrusion blocks, a first spring is installed between the two groups of the fixing grooves, and first inclined surfaces are provided at the opposite ends of the two groups of the extrusion blocks and the connecting blocks, and the two groups of the first inclined surfaces are fitted together.

[0010] As a preferred solution of the utility model, limiting grooves are provided on both sides of the top of the limiting seat, the inner side of the limiting groove is slidably connected to a limiting block, a second spring is installed between one side of the limiting block and the inner wall of the limiting groove, and one end of the limiting block is fixedly connected to one side of the extrusion block.

[0011] As a preferred solution of the utility model, the positioning assembly includes abutment grooves opened on both sides of the extrusion block, the inner side of the abutment groove is rotatably connected with an abutment rod, the outer side of the abutment rod is installed with an abutment block, one side of the abutment block is provided with a second inclined surface that fits with the first inclined surface, a torsion spring is installed between one end of the abutment rod and the inner wall of the abutment groove, and positioning grooves are opened on both sides of the connecting block at the first inclined surface.

[0012] As a preferred solution of the utility model, the buckle and pull assembly includes a connecting groove opened on one side of the extrusion block, a buckle and pull rod is installed on the inner side of the connecting groove, an extension groove is opened on the top of the mounting plate, the buckle and pull rod extends to the inner side of the extension groove and is rotatably connected to a pull ring, the inner wall of the extension groove is opened with two groups of push grooves extending to the inner side of the extrusion groove, the buckle and pull rod is slidably connected to the push groove, magnetic blocks are installed on both sides of the inner wall of the extension groove, and one end of the pull ring is embedded with an iron block that is adsorbed by the magnetic block.

[0013] As a preferred scheme of the utility model, the splicing assembly includes a concave block installed on one side of one group of mounting plates, and a convex block engaged with the concave block is installed on one side of the other group of mounting plates, a fixing plate is installed at one end of the top of the concave block, a positioning column is slidably connected to the inner side of the fixing plate, a positioning hole is opened at the top of the concave block and extends to the inner side of the protrusion, the positioning column and the positioning hole are slidably connected, a pull plate is installed at the other end of the positioning column, a third spring is installed between both ends of the pull plate and the fixed plate, a buckle ring is installed at the center of the pull plate, a connecting seat is installed on one side of the outer wall of the cylinder below the two groups of mounting plates, a synchronous groove is opened on the top of the connecting seat, and a synchronous block slidably connected to the synchronous groove is installed at the bottom ends of the two groups of mounting plates, and the synchronous groove and the synchronous block are both T-shaped.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] In the utility model, the mounting frame and the filter screen are connected and assembled on the mounting plate by means of an extrusion connection component, the positioning component clamps the extrusion connection component, and the buckle and pull component is released to fix the positions of the mounting frame and the filter screen. The utility model has a simple structure and is easy to operate. The staff can complete the quick disassembly and assembly operation by pressing and pulling, so as to replace the aged filter screen or clean the clogged part, thereby ensuring the subsequent sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of two sets of mounting plates of the utility model;

[0018] Figure 3 This is a schematic diagram of a partial three-dimensional structure of the buckle and pull assembly of the utility model;

[0019] Figure 4 This is a partial cross-sectional structural diagram of the locking mechanism of the utility model;

[0020] Figure 5 It is a partial cross-sectional structural schematic diagram of the assembled components of the utility model.

[0021] In the figure: 1. cylinder; 2. upper cylinder; 3. lower cylinder; 4. mounting plate; 5. mounting frame; 6. filter screen; 7. rubber pad; 8. connecting block; 9. limiting seat; 10. extrusion block; 11. first spring; 12. limiting block; 13. abutting block; 14. torsion spring; 15. buckle pull rod; 16. pull ring; 17. magnetic block; 18. concave block; 19. positioning column; 20. pull plate; 21. third spring; 22. second spring; 23. connecting seat. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] Example:

[0024] See also Figure 1-Figure 5 , the utility model provides a technical solution:

[0025] A wastewater treatment device for a desulfurization tower, comprising a cylinder 1, a driving device is installed at the top of the cylinder 1, a seed filling piece is installed on the inner wall of the cylinder 1, a drainage body is installed on the inner side of the seed filling piece, a wastewater drainage pipe is embedded and installed at one end of the cylinder 1, a rotating shaft is installed at the driving end of the driving device, a drainage part is installed at one end of the rotating shaft extending to the inner side of the drainage body, a water flow outlet is installed on the other side of the cylinder 1, the cylinder 1 comprises an upper cylinder 2 and a lower cylinder 3, two groups of connecting columns are installed between the upper cylinder 2 and the lower cylinder 3, two groups of mounting plates 4 are slidably connected between the upper cylinder 2 and the lower cylinder 3, the two groups of mounting plates 4 are clamped by a splicing assembly, a mounting frame 5 is installed on the inner side of the mounting plate 4 through a locking assembly, and one side of the mounting frame 5 is installed The filter screen 6, the locking component includes a connecting component, a positioning component and a buckle and pull component, the connecting component is used to connect and assemble the mounting frame 5 and the filter screen 6 on the mounting plate 4, the positioning component is used to clamp and squeeze the connecting component, and the buckle and pull component is used to release the position fixation of the mounting frame 5 and the filter screen 6. When in use, the device can connect and assemble the mounting frame 5 and the filter screen 6 on the mounting plate 4 by squeezing the connecting component, the positioning component clamps and squeezes the connecting component, and the buckle and pull component releases the position fixation of the mounting frame 5 and the filter screen 6. It has a simple structure and is easy to operate. The staff can complete the quick disassembly and assembly operation by pressing and pulling, so as to replace the aged filter screen 6 or clean the blocked part, thereby ensuring the subsequent sewage treatment effect.

[0026] In this embodiment, if Figure 1 , Figure 2 and Figure 3 As shown, the connecting component includes a rubber pad 7 embedded and installed on one side of the mounting frame 5, a through hole is opened inside the rubber pad 7, a connecting block 8 is installed on one side of the mounting frame 5 at the through hole, a connecting groove is opened on the side of the mounting plate 4 close to the mounting frame 5, the connecting block 8 is slidably connected to the connecting groove, an extrusion groove is opened inside the mounting plate 4 on one side of the connecting groove, both ends of the inner side of the extrusion groove are installed with limiting seats 9, both ends of the top of the limiting seat 9 are overlapped with extrusion blocks 10, a fixing groove is opened at the bottom end of the opposite surface of the extrusion block 10, and a first spring 11 is installed between the two groups of fixing grooves. First, when the mounting plate 4 is in the unfolded state, the mounting frame 5 is inserted into the inner side of the mounting plate 4, so that the connecting block 8 slides into the connecting groove, and fits with the extrusion block 10 on the inner side of the extrusion groove to achieve a preliminary docking effect.

[0027] In this embodiment, if Figure 2 , Figure 3 and Figure 4As shown, the opposite ends of the two groups of extrusion blocks 10 and the connecting block 8 are provided with a first inclined surface, and the two groups of first inclined surfaces are fitted with each other. Limiting grooves are provided on both sides of the top of the limiting seat 9, and the limiting blocks 12 are slidably connected to the inner side of the limiting grooves. A second spring 22 is installed between one side of the limiting block 12 and the inner wall of the limiting groove. One end of the limiting block 12 is fixedly connected to one side of the extrusion block 10. The positioning component includes abutment grooves provided on both sides of the inside of the extrusion block 10, an abutment rod is rotatably connected to the inner side of the abutment groove, and an abutment block 13 is installed on the outer side of the abutment rod. A second inclined surface fitted with the first inclined surface is provided on one side of the abutment block 13, and a torsion spring 14 is installed between one end of the abutment rod and the inner wall of the abutment groove. Both sides of the connecting block 8 are located at the first inclined surface. There are positioning grooves on the surfaces, and then, the mounting frame 5 is continuously squeezed to drive the connecting block 8 to move synchronously, and the connecting block 8 then presses the squeezing block 10, so that the limiting block 12 cooperates with the limiting groove to squeeze the second spring 22, and the first spring 11 is also stretched accordingly, and the first inclined surface presses the second inclined surface on the abutting block 13, forcing it to cooperate with the torsion spring 14 to retract to the inside of the abutting groove. After it is aligned with the positioning groove, the torsion spring 14 rebounds and drives the abutting block 13 to expand inside the positioning groove. When pressed, the rubber pad 7 is in a compressed state. After releasing, the rubber pad 7 rebounds for a distance due to its own elasticity. During the movement, the abutting block 13 abuts against the inner wall of the positioning groove, so that the position of the filter screen 6 can be fixed for subsequent use.

[0028] In this embodiment, if Figure 1 , Figure 2 and Figure 3 As shown, the buckle pull assembly includes a connecting groove opened on one side of the extrusion block 10, a buckle pull rod 15 is installed on the inner side of the connecting groove, an extension groove is opened on the top of the mounting plate 4, the buckle pull rod 15 extends to the inner side of the extension groove and is rotatably connected to the pull ring 16, the inner wall of the extension groove is opened with two groups of push grooves extending to the inner side of the extrusion groove, the buckle pull rod 15 and the push groove are slidably connected, magnetic blocks 17 are installed on both sides of the inner wall of the extension groove, one end of the pull ring 16 is embedded with an iron block adsorbed by the magnetic block 17, further, the two groups of pull rings 16 are buckled to drive the buckle pull rod 15 to move inside the push groove, and the buckle pull rod 15 also drives the extrusion block at the same time. 10 moves, at this time the first spring 11 is compressed, the second spring 22 is stretched again, and the extrusion block 10 moves synchronously therewith, the abutment block 13 on the inner side of the abutment groove gradually slides on the inner side of the positioning groove and moves away from the inner side of the positioning groove. After it is completely separated from the inner side of the positioning groove, the rubber pad 7 begins to rebound, and the connecting block 8 is driven to rise a distance. At this time, the positions of the positioning groove and the abutment block 13 are staggered, and the pull ring 16 will not be stuck again when releasing it. At this time, the removed filter screen 6 can be carefully cleaned, and the pull ring 16 can be turned over during installation to allow the iron block on it to be adsorbed close to the magnetic block 17 to avoid hindering the installation.

[0029] In this embodiment, if Figure 1 and Figure 5As shown, the splicing assembly includes a concave block 18 installed on one side of one group of mounting plates 4, a convex block engaged with the concave block 18 is installed on one side of the other group of mounting plates 4, a fixing plate is installed on one end of the top of the concave block 18, a positioning column 19 is slidably connected to the inner side of the fixing plate, a positioning hole extending to the inner side of the convex block is opened on the top of the concave block 18, the positioning column 19 is slidably connected to the positioning hole, a pull plate 20 is installed on the other end of the positioning column 19, and a third spring 21 is installed between both ends of the pull plate 20 and the fixing plate, and the pull plate 20 A buckle ring is installed in the center, and a connecting seat 23 is installed on one side of the outer wall of the cylinder 1 below the two groups of mounting plates 4. A synchronous groove is opened on the top of the connecting seat 23, and a synchronous block slidably connected to the synchronous groove is installed at the bottom end of the two groups of mounting plates 4. The synchronous groove and the synchronous block are both T-shaped. Furthermore, buckling the buckle ring can drive the positioning column 19 and the pull plate 20 to move, and at the same time stretch the third spring 21 until the positioning column 19 is away from the inner side of the protrusion, and then the synchronous block and the synchronous groove can be cooperated to drive the two groups of mounting plates 4 to unfold for disassembly and assembly operations.

[0030] The implementation principle of a wastewater treatment device for a desulfurization tower in the embodiment of the present application is as follows: when the mounting plate 4 is in the unfolded state, the mounting frame 5 is inserted into the inner side of the mounting plate 4, so that the connecting block 8 slides into the connecting groove and fits with the extrusion block 10 on the inner side of the extrusion groove to achieve a preliminary docking effect, and the mounting frame 5 is continuously extruded to drive the connecting block 8 to move synchronously, and the connecting block 8 then presses the extrusion block 10, so that the limiting block 12 cooperates with the limiting groove to squeeze the second spring 22, and the first spring 11 is also stretched accordingly, and the first inclined surface presses the second inclined surface on the abutment block 13, forcing it to cooperate with the torsion spring 14 to retract to the inner side of the abutment groove. After it is aligned with the positioning groove, the torsion spring 14 rebounds and drives the abutment block 13 to unfold inside the positioning groove. When pressed, the rubber pad 7 is in a compressed state. After being released, the rubber pad 7 rebounds a distance due to its own elasticity. During the movement, the abutment block 13 abuts against the inner wall of the positioning groove, and the position of the filter screen 6 can be fixed for subsequent use. The second spring 22 is stretched again, and the extrusion block 10 moves synchronously therewith. The abutment block 13 on the inner side of the abutment groove gradually slides inside the positioning groove and moves away from the inner side of the positioning groove. After it is completely separated from the inner side of the positioning groove, the rubber pad 7 begins to rebound, and the connecting block 8 is driven to rise one end distance. At this time, the positions of the positioning groove and the abutment block 13 are staggered. The pull ring 16 will not be stuck again when the pull ring 16 is released. At this time, the removed filter screen 6 can be carefully cleaned. The pull ring 16 can be turned over during installation so that the iron block on it is adsorbed close to the magnetic block 17 to avoid hindering the installation. Buckling the buckle ring can drive the positioning column 19 and the pull plate 20 to move, and at the same time stretch the third spring 21. Until the positioning column 19 is away from the inner side of the protrusion, the synchronous block and the synchronous groove can be cooperated to drive the two groups of mounting plates 4 to unfold for disassembly and assembly.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wastewater treatment device for a desulfurization tower, comprising a cylinder (1), a driving device is installed at the top of the cylinder (1), a seed filling piece is installed on the inner wall of the cylinder (1), a drainage body is installed on the inner side of the seed filling piece, a wastewater drainage pipe is embedded in one end of the cylinder (1), a rotating shaft is installed at the driving end of the driving device, a drainage part is installed at one end of the rotating shaft extending to the inner side of the drainage body, and a water flow outlet is installed on the other side of the cylinder (1), characterized in that: The cylinder (1) comprises an upper cylinder (2) and a lower cylinder (3), two groups of connecting columns are installed between the upper cylinder (2) and the lower cylinder (3), two groups of mounting plates (4) are slidably connected between the upper cylinder (2) and the lower cylinder (3), the two groups of mounting plates (4) are clamped by a splicing assembly, a mounting frame (5) is installed on the inner side of the mounting plate (4) by a locking assembly, a filter screen (6) is installed on one side of the mounting frame (5), the locking assembly comprises a connecting assembly, a positioning assembly and a buckle assembly, the connecting assembly is used to connect and splice the mounting frame (5) and the filter screen (6) on the mounting plate (4), the positioning assembly is used to clamp and squeeze the connecting assembly, and the buckle assembly is used to release the position fixation of the mounting frame (5) and the filter screen (6).

2. A wastewater treatment device for a desulfurization tower according to claim 1, characterized in that: The connection assembly comprises a rubber pad (7) embedded and installed on one side of the mounting frame (5), a through hole is provided inside the rubber pad (7), a connection block (8) is installed on one side of the mounting frame (5) at the through hole, a connection groove is provided on a side of the mounting plate (4) close to the mounting frame (5), the connection block (8) is slidably connected to the connection groove, and an extrusion groove is provided inside the mounting plate (4) at one side of the connection groove.

3. A wastewater treatment device for a desulfurization tower according to claim 2, characterized in that: Limiting seats (9) are installed at both ends of the inner side of the extrusion groove, and extrusion blocks (10) are overlapped at both ends of the top of the limiting seats (9). The bottom ends of the opposite surfaces of the extrusion blocks (10) are provided with fixing grooves, and a first spring (11) is installed between the two groups of the fixing grooves. The opposite ends of the two groups of the extrusion blocks (10) and the connecting block (8) are provided with first inclined surfaces, and the two groups of the first inclined surfaces are in contact with each other.

4. A wastewater treatment device for a desulfurization tower according to claim 3, characterized in that: Limiting grooves are provided on both sides of the top of the limiting seat (9), and a limiting block (12) is slidably connected to the inner side of the limiting groove. A second spring (22) is installed between one side of the limiting block (12) and the inner wall of the limiting groove, and one end of the limiting block (12) is fixedly connected to one side of the extrusion block (10).

5. A wastewater treatment device for a desulfurization tower according to claim 4, characterized in that: The positioning assembly comprises abutment grooves formed on both sides of the extrusion block (10), the inner side of the abutment groove is rotatably connected with an abutment rod, the outer side of the abutment rod is provided with an abutment block (13), one side of the abutment block (13) is provided with a second inclined surface that is in contact with the first inclined surface, a torsion spring (14) is installed between one end of the abutment rod and the inner wall of the abutment groove, and both sides of the connection block (8) are provided with positioning grooves at the first inclined surface.

6. A wastewater treatment device for a desulfurization tower according to claim 5, characterized in that: The buckle and pull assembly comprises a connecting groove provided on one side of the extrusion block (10), a buckle and pull rod (15) is installed inside the connecting groove, an extension groove is provided on the top of the mounting plate (4), one end of the buckle and pull rod (15) extending to the inner side of the extension groove is rotatably connected to a pull ring (16), the inner wall of the extension groove is provided with two groups of push grooves extending to the inner side of the extrusion groove, the buckle and pull rod (15) is slidably connected to the push groove, magnetic blocks (17) are installed on both sides of the inner wall of the extension groove, and one end of the pull ring (16) is embedded with an iron block adsorbed by the magnetic block (17).

7. A wastewater treatment device for a desulfurization tower according to claim 6, characterized in that: The splicing assembly comprises a concave block (18) mounted on one side of one group of mounting plates (4), and a convex block engaged with the concave block (18) is mounted on one side of the other group of mounting plates (4); a fixing plate is mounted on one end of the top of the concave block (18); a positioning column (19) is slidably connected to the inner side of the fixing plate; a positioning hole extending to the inner side of the convex block is opened on the top of the concave block (18); the positioning column (19) is slidably connected to the positioning hole; a pulling plate (20) is mounted on the other end of the positioning column (19); a third spring (21) is mounted between both ends of the pulling plate (20) and the fixing plate; a buckle ring is mounted at the center of the pulling plate (20); a connecting seat (23) is mounted on one side of the outer wall of the cylinder (1) below the two groups of mounting plates (4); a synchronous groove is opened on the top of the connecting seat (23); a synchronous block slidably connected to the synchronous groove is mounted on the bottom ends of the two groups of mounting plates (4); and the synchronous groove and the synchronous block are both T-shaped.

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