High-salt waste incineration flue gas denitration device

Abstract

This utility model relates to the field of flue gas treatment technology and discloses a denitrification device for high-salt hazardous waste incineration flue gas. It includes a treatment box, a conveyor box fixedly connected to the front side wall of the treatment box, and a feed pipe penetrating the front side wall of the conveyor box. Two guide rail grooves are formed on the top of the interior of each treatment box. A support plate is slidably connected inside each guide rail groove, and a filter plate is fixedly connected inside each support plate. Handles are fixedly connected to the left side walls of both support plates. This utility model, through its guide rail grooves, filter plates, and filling box, solves the problems of reduced denitrification efficiency, shortened equipment lifespan, and increased operating costs. Gas is extracted from the storage tank through the conveyor pipe, then sprayed out through the transfer pipe and outlet pipe by nozzles, thereby effectively improving denitrification efficiency and stability, extending the equipment's maintenance cycle and lifespan, and reducing equipment maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, and in particular to a denitrification device for flue gas from high-salt hazardous waste incineration. Background Technology

[0002] High-salt hazardous waste refers to waste containing high levels of salt and possessing hazardous characteristics such as corrosivity, toxicity, and flammability. Industrial production, such as chemical, pharmaceutical, and dyeing industries, generates large quantities of high-salt hazardous waste. Incineration is a common disposal method to achieve volume reduction and harmless treatment. However, the incineration of high-salt hazardous waste produces large amounts of flue gas, among which nitrogen oxides (NOx) are one of the main pollutants. NOx not only contributes to environmental hazards such as acid rain and chemical smog but also poses a serious threat to human health, such as irritating the respiratory tract and causing lung diseases.

[0003] High-salt hazardous waste incineration flue gas contains a large amount of solid particles, salt, and other impurities. When these impurities directly enter the denitrification unit, solid particles may clog the nozzles of the spray guns, preventing the denitrifying agent from being sprayed evenly. The high impurity content in the filtered flue gas can interfere with the reaction between the denitrifying agent and nitrogen oxides, preventing the agent from fully reacting with nitrogen oxides. This leads to reduced denitrification efficiency, shortened equipment lifespan, and the need for frequent catalyst replacement, increasing operating costs. During the denitrification process, the denitrifying agent may not be evenly dispersed in the flue gas, resulting in excessively high concentrations in some areas and insufficient concentrations in others, making it difficult for the flue gas to mix thoroughly with the denitrifying agent. Ammonia may accumulate in localized areas, failing to fully contact and react with nitrogen oxides in the flue gas, thus reducing the denitrification effect, shortening the overall catalyst lifespan, increasing the cost and frequency of catalyst replacement, and ultimately reducing the overall catalyst lifespan. Utility Model Content

[0004] The main purpose of this invention is to provide a denitrification device for high-salt hazardous waste incineration flue gas, which can effectively solve the problems of reduced denitrification efficiency, shortened equipment lifespan, frequent catalyst replacement, increased operating costs, reduced denitrification effect, shortened catalyst lifespan, increased cost and frequency of catalyst replacement, and shortened overall catalyst lifespan.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a denitrification device for high-salt hazardous waste incineration flue gas, comprising a treatment box, a conveying box fixedly connected to the front side wall of the treatment box, a feed pipe penetrating the front side wall of the conveying box, two guide rail grooves opened on the top of the interior of the treatment box, a support plate slidably connected inside each guide rail groove, a filter plate fixedly connected inside each support plate, a handle fixedly connected to the left side wall of each of the two support plates, a filling box fixedly connected inside the treatment box, the filling box being located at the bottom of the bottom support plate, a partition plate fixedly connected inside the treatment box, a guide plate fixedly connected to the top of the partition plate, and a waste discharge pipe penetrating the left side of the treatment box.

[0006] Furthermore, a mounting block is fixedly connected to the rear side wall of the processing box, and a gas storage tank is fixedly connected to the rear side wall of the mounting block. The top of each gas storage tank is connected to an air inlet pipe. The front ends of the two air inlet pipes are connected through to the rear side wall of the processing box. The front ends of the two air inlet pipes are located at the bottom of the filling box. A base plate is fixedly connected to the rear side wall of the processing box.

[0007] Furthermore, a pump is installed on the top of the base plate. The input end of the pump is fixedly connected to a delivery pipe. The top end of the delivery pipe is connected to the bottom of the gas storage tank. The two output ends on the left and right sides of the pump are fixedly connected to adapter pipes. The front ends of the adapter pipes are connected to air outlet pipes. The tops of the two air outlet pipes are connected to nozzles. The front ends of the two air outlet pipes penetrate into the bottom wall of the processing box.

[0008] Furthermore, a control panel is fixedly connected to the top of the right side wall of the processing box, and an exhaust pipe is connected through the bottom of the right side wall of the processing box, with the left end of the exhaust pipe located at the bottom of the partition plate.

[0009] Furthermore, a motor is installed on the right side wall of the processing box, and a rotating rod is fixedly connected to the output end of the motor. The left end of the rotating rod is rotatably connected to the inner left side wall of the processing box. Fixed rings are fixedly connected to both the left and right ends of the middle part of the rotating rod, and support plates are fixedly connected to the front and rear sides of the two fixed rings.

[0010] Furthermore, stirring blocks are fixedly connected to the inner walls of both support plates, and first connecting rings are fixedly connected to the outer side of the middle part of the rotating rod. A stirring rod is fixedly connected to the outer side of each first connecting ring. Multiple stirring rods and multiple stirring blocks are arranged in a crisscross pattern. Device boxes are provided on the outer sides of both the left and right ends of the rotating rod.

[0011] Furthermore, the outer sides of both the left and right ends of the rotating rod are fixedly connected with first bevel gears, and two second bevel gears are provided on the front and rear sides of the interior of each device box. Each first bevel gear meshes with two second bevel gears, and a connecting rod is fixedly connected inside each of the four second bevel gears.

[0012] Furthermore, the other ends of the four connecting rods are rotatably connected to the front and rear side walls inside the processing box, and two second connecting rings are fixedly connected to the outer side of each connecting rod, and a push plate is fixedly connected to the outer side of each second connecting ring.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This utility model, through its guide rail groove, filter plate, filling box, waste discharge pipe, mounting block, gas storage tank, pump, and nozzle, solves the problems of reduced denitrification efficiency, shortened equipment lifespan, frequent catalyst replacement, and increased operating costs. Gas from the storage tank is extracted through a conveying pipe, then through a transfer pipe and outlet pipe, and finally sprayed out through the nozzle. The reaction gas sprayed from the nozzle mixes thoroughly with the flue gas guided by the guide plate at the bottom of the treatment chamber, creating conditions for the denitrification reaction. Simultaneously, the interior is divided into two zones. First, denitrification liquid is poured into the bottom zone, and then the flue gas is sprayed into the denitrification liquid in the bottom zone. This effectively improves denitrification efficiency and stability, extends the equipment's maintenance cycle and lifespan, and reduces equipment maintenance costs.

[0015] 2. By incorporating a motor, stirring block, stirring rod, first bevel gear, second connecting ring, and push plate, the system effectively addresses the issues that reduce denitrification efficiency, shorten the overall lifespan of the catalyst, and increase the cost and frequency of catalyst replacement. The first bevel gear at both ends of the rotating rod meshes with the second bevel gear inside the device housing, causing the second bevel gear and connecting rod to rotate. The second connecting ring and push plate on the connecting rod then rotate, with the push plate propelling the gas in the bottom area of ​​the treatment tank. This effectively improves the rate and efficiency of the denitrification reaction, extends the equipment's lifespan, reduces maintenance costs, and minimizes the risk of production interruptions due to equipment failure.

[0016] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the high-salt hazardous waste incineration flue gas denitrification device proposed in this utility model;

[0018] Figure 2This is an internal cross-sectional view of the denitrification device for high-salt hazardous waste incineration flue gas proposed in this utility model;

[0019] Figure 3 This is a structural diagram of the filter plate of the high-salt hazardous waste incineration flue gas denitrification device proposed in this utility model;

[0020] Figure 4 This is a structural diagram of the filling box of the high-salt hazardous waste incineration flue gas denitrification device proposed in this utility model;

[0021] Figure 5 This is a rear structural diagram of the high-salt hazardous waste incineration flue gas denitrification device proposed in this utility model;

[0022] Figure 6 This is a structural diagram of the mounting block of the high-salt hazardous waste incineration flue gas denitrification device proposed in this utility model;

[0023] Figure 7 This is a schematic diagram of the gas outlet pipe of the high-salt hazardous waste incineration flue gas denitrification device proposed in this utility model;

[0024] Figure 8 This is a structural diagram of the partition plate of the high-salt hazardous waste incineration flue gas denitrification device proposed in this utility model;

[0025] Figure 9 This is a structural diagram of the support plate of the high-salt hazardous waste incineration flue gas denitrification device proposed in this utility model;

[0026] Figure 10 This is a structural diagram of the connecting rod of the high-salt hazardous waste incineration flue gas denitrification device proposed in this utility model.

[0027] Legend:

[0028] 1. Processing box; 2. Conveying box; 3. Feed pipe; 4. Guide rail groove; 5. Support plate; 6. Filter plate; 7. Handle; 8. Filling box; 9. Divider plate; 10. Guide plate; 11. Waste discharge pipe; 12. Mounting block; 13. Air storage tank; 14. Air inlet pipe; 15. Base plate; 16. Pump; 17. Conveying pipe; 18. Transfer pipe; 19. Air outlet pipe; 20. Nozzle; 21. Control panel; 22. Exhaust pipe; 23. Motor; 24. Rotating rod; 25. Fixing ring; 26. Support plate; 27. Stirring block; 28. First connecting ring; 29. ​​Stirring rod; 30. Device box; 31. First bevel gear; 32. Second bevel gear; 33. Connecting rod; 34. Second connecting ring; 35. Push plate. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0030] like Figure 1 - Figure 6 As shown: A high-salt hazardous waste incineration flue gas denitrification device includes a treatment box 1. A conveying box 2 is fixedly connected to the front side wall of the treatment box 1. A feed pipe 3 is connected through the front side wall of the conveying box 2. Flue gas enters the conveying box 2 through the feed pipe 3. The conveying box 2 serves as a flue gas inlet buffer area for the entire denitrification device, which can balance the flue gas flow fluctuations caused by the incineration process and ensure that the flue gas enters the interior of the treatment box 1 smoothly.

[0031] The top of the treatment box 1 has two guide rail grooves 4. A support plate 5 is slidably connected inside each guide rail groove 4. A filter plate 6 is fixedly connected inside each support plate 5. A handle 7 is fixedly connected to the left side wall of each support plate 5. The support plate 5 and the filter plate 6 can be easily removed from the treatment box 1 through the handle 7 for cleaning, maintenance or replacement, ensuring the continuous and efficient operation of the filtration process. The flue gas flows from top to bottom and passes through multiple layers of filter plates 6 in sequence. Large particles, salts and other impurities are intercepted in this process. On the other hand, the position of the filter plate 6 can be flexibly adjusted according to the actual filtration requirements such as the content and particle size of impurities in the flue gas.

[0032] A filling box 8 is fixedly connected inside the treatment box 1. The filling box 8 is located at the bottom of the bottom support plate 5. The filling box 8 stores the filling material on the outside, allowing the flue gas to enter the interior of the filling box 8 after passing through the filter plate 6, where it is filtered again by the filling material. A partition plate 9 is fixedly connected inside the treatment box 1, dividing the interior of the treatment box 1 into two areas for flue gas treatment. A guide plate 10 is fixedly connected to the top of the partition plate 9, and a discharge pipe 11 is connected through the left side of the treatment box 1. The guide plate 10 at the top of the partition plate 9 guides the separated impurities in the flue gas, causing these impurities to flow into the discharge pipe 11 and be discharged from the interior of the treatment box 1.

[0033] A mounting block 12 is fixedly connected to the rear side wall of the treatment box 1, and a gas storage tank 13 is fixedly connected to the rear side wall of the mounting block 12. The gas storage tank 13 is fixed to the rear side wall of the treatment box 1 by the mounting block 12. An air inlet pipe 14 is connected to the top of each gas storage tank 13. The front ends of the two air inlet pipes 14 are connected through the rear side wall of the treatment box 1, and the front ends of the two air inlet pipes 14 are located at the bottom of the filling box 8. The filtered flue gas is drawn into the interior of the gas storage tank 13 through the air inlet pipes 14 for temporary collection. A base plate 15 is fixedly connected to the rear side wall of the treatment box 1.

[0034] like Figure 1 - Figure 8As shown, a pump 16 is installed on the top of the base plate 15. A delivery pipe 17 is fixedly connected to the input end of the pump 16, and the top end of the delivery pipe 17 is connected to the bottom of the gas storage tank 13. Two adapter pipes 18 are fixedly connected to the left and right output ends of the pump 16, and air outlet pipes 19 are connected to the front ends of the adapter pipes 18. The tops of the two air outlet pipes 19 are connected to nozzles 20. The base plate 15 provides support and fixation for the pump 16. When the pump 16 is started, the nozzles on the input end of the pump 16... The delivery pipe 17 draws the flue gas from inside the gas storage tank 13, and the drawn flue gas is evenly transported through the output ends on the left and right sides of the pump 16 to the inside of the two outlet pipes 19 via the two transfer pipes 18. After the denitrification agent liquid is placed in the bottom area of ​​the treatment box 1, the outlet pipe 19 and the nozzle 20 are set inside the bottom wall of the treatment box 1, so that the nozzle 20 sprays the flue gas to the bottom area of ​​the treatment box 1. When spraying, the flue gas will be sprayed into the denitrification agent liquid to mix with the flue gas and perform denitrification treatment on the flue gas.

[0035] The front ends of the two exhaust pipes 19 are connected through to the inside of the bottom wall of the treatment box 1. A control panel 21 is fixedly connected to the top of the right side wall of the treatment box 1, and the entire equipment is controlled through the control panel 21. An exhaust pipe 22 is connected through to the bottom of the right side wall of the treatment box 1. The left end of the exhaust pipe 22 is located at the bottom of the partition plate 9. The exhaust pipe 22 is used to discharge the denitrified flue gas from the inside of the treatment box 1 and transport it to the next piece of equipment.

[0036] like Figure 1 - Figure 9As shown, a motor 23 is installed on the right side wall of the processing tank 1. A rotating rod 24 is fixedly connected to the output end of the motor 23. The left end of the rotating rod 24 is rotatably connected to the inner left side wall of the processing tank 1. Fixing rings 25 are fixedly connected to both the left and right ends of the middle part of the rotating rod 24. Support plates 26 are fixedly connected to the front and rear sides of the two fixing rings 25. Stirring blocks 27 are fixedly connected to the inner walls of the two support plates 26. First connecting rings 28 are fixedly connected to the outer side of the middle part of the rotating rod 24. Stirring rods 29 are fixedly connected to the outer side of each first connecting ring 28. The multiple stirring rods 29 and multiple stirring blocks 27 are intersecting. The system is configured such that, after the motor 23 is started, it drives the rotating rod 24 to rotate within the bottom area of ​​the treatment chamber 1. The fixing ring 25 in the middle of the rotating rod 24 rotates accordingly, causing the support plate 26 and the stirring block 27 to rotate. Additionally, the first connecting ring 28 on the outer side of the rotating rod 24 also rotates, driving the stirring rod 29 to rotate. The stirring block 27 and the stirring rod 29 are arranged crosswise to stir the flue gas and denitrification liquid in the bottom area of ​​the treatment chamber 1, further enhancing the mixing effect and improving the rate and completeness of the denitrification reaction. Device boxes 30 are provided on the outer sides of both ends of the rotating rod 24 to protect the first bevel gear 31 and the second bevel gear 32 inside.

[0037] like Figure 1 - Figure 10 As shown, first bevel gears 31 are fixedly connected to the outer sides of both ends of the rotating rod 24. Two second bevel gears 32 are provided on the front and rear sides of the interior of each device box 30. Each first bevel gear 31 meshes with two second bevel gears 32. Connecting rods 33 are fixedly connected to the interior of each of the four second bevel gears 32. The other ends of the four connecting rods 33 are rotatably connected to the front and rear side walls inside the processing box 1. Two second connecting rings 34 are fixedly connected to the outer side of each connecting rod 33. A push plate is fixedly connected to the outer side of each second connecting ring 34. 35. The first bevel gears 31 at both ends of the rotating rod 24 rotate inside the device box 30 along with the rotating rod 24. Inside the device box 30, the first bevel gears 31 mesh with two second bevel gears 32, driving the two second bevel gears 32 and the connecting rod 33 to rotate. The second connecting ring 34 and the push plate 35 on the connecting rod 33 also rotate accordingly. The push plate 35 pushes the gas in the bottom area of ​​the treatment box 1, optimizes the gas flow direction, makes the substances of the flue gas denitrification reaction more evenly distributed, and further promotes the denitrification reaction.

[0038] It should be noted that this utility model is a denitrification device for flue gas from high-salt hazardous waste incineration. First, the pump 16, motor 23 and control panel 21 are connected to an external power source to supply power to the device.

[0039] The flue gas entering the treatment chamber 1 first comes into contact with the top filter plate 6. The operator can use the handle 7 to slide the support plate 5 along the guide rail groove 4. On the one hand, the position of the filter plate 6 can be flexibly adjusted according to the actual filtration requirements, such as the content and particle size of impurities in the flue gas; on the other hand, when the filter plate 6 becomes clogged or damaged due to long-term use, the support plate 5, along with the filter plate 6, can be easily removed from the treatment chamber 1 via the handle 7 for cleaning, repair, or replacement, ensuring continuous and efficient operation of the filtration process. The flue gas flows from top to bottom, passing through multiple layers of filter plates 6 in sequence, where large particles of impurities and salts are intercepted. Impurities produced during filtration fall under gravity and are discharged from the device through the discharge pipe 11, preventing impurities from accumulating inside the device and affecting subsequent treatment.

[0040] The pre-filtered flue gas continues downward to the filling box 8. The filling box 8 is filled with catalysts or other reaction materials required for the denitrification reaction. These materials can promote the chemical reaction between nitrogen oxides in the flue gas and the filling materials under specific temperature, concentration and other conditions, thereby reducing the nitrogen oxide content and achieving deep treatment of the flue gas.

[0041] The gas storage tank 13 stores the flue gas, which enters the bottom of the treatment chamber 1 through the inlet pipe 14. The pump 16 is started, drawing the gas from the storage tank 13 through the delivery pipe 17, and then spraying it out through the nozzle 20 via the transfer pipe 18 and the outlet pipe 19. The reaction gas sprayed from the nozzle 20 mixes thoroughly with the flue gas guided by the guide plate 10 in the lower part of the treatment chamber 1, creating conditions for the denitrification reaction. At the same time, the interior of the treatment chamber 1 is divided into two areas by the partition plate 9. First, the bottom area of ​​the treatment chamber 1 is filled with denitrification liquid, and then the flue gas is sprayed into the denitrification liquid in the bottom area of ​​the treatment chamber 1 through the nozzle 20.

[0042] The control panel 21 starts the motor 23, which drives the rotating rod 24 to rotate. The fixing ring 25 and the first connecting ring 28 in the middle of the rotating rod 24 rotate accordingly. The fixing ring 25 drives the support plate 26 and the stirring block 27 to rotate, and the first connecting ring 28 drives the stirring rod 29 to rotate. The stirring block 27 and the stirring rod 29 are arranged crosswise to stir the flue gas, reaction gas and denitrification liquid in the bottom area, further enhancing the mixing effect and improving the rate and completeness of the denitrification reaction.

[0043] The first bevel gears 31 at both ends of the rotating rod 24 rotate with the rotating rod and mesh with the second bevel gear 32 inside the device box 30, driving the second bevel gear 32 and the connecting rod 33 to rotate. The second connecting ring 34 and the push plate 35 on the connecting rod 33 rotate accordingly. The push plate 35 pushes the gas in the bottom area of ​​the treatment box 1, optimizes the gas flow, and makes the flue gas, reactant gas, and substances participating in the denitrification reaction more evenly distributed, further promoting the denitrification reaction.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A denitrification device for flue gas from high-salt hazardous waste incineration, comprising a treatment tank (1), characterized in that: The front side wall of the processing box (1) is fixedly connected to a conveyor box (2), and the front side wall of the conveyor box (2) is connected through a feed pipe (3). The top of the processing box (1) has two guide rail grooves (4), and a support plate (5) is slidably connected inside each guide rail groove (4). A filter plate (6) is fixedly connected inside each support plate (5). A handle (7) is fixedly connected to the left side wall of each of the two support plates (5). A filling box (8) is fixedly connected inside the processing box (1). The filling box (8) is located at the bottom of the bottom support plate (5). A partition plate (9) is fixedly connected inside the processing box (1). A guide plate (10) is fixedly connected to the top of the partition plate (9). A waste discharge pipe (11) is connected through the left side of the processing box (1).

2. The denitrification device for high-salt hazardous waste incineration flue gas according to claim 1, characterized in that: The rear side wall of the processing box (1) is fixedly connected to an installation block (12), and the rear side wall of the installation block (12) is fixedly connected to an air storage tank (13). The top of the air storage tank (13) is connected to an air inlet pipe (14). The front ends of the two air inlet pipes (14) are connected through to the rear side wall of the processing box (1). The front ends of the two air inlet pipes (14) are located at the bottom of the filling box (8). The rear side wall of the processing box (1) is fixedly connected to a bottom plate (15).

3. The denitrification device for high-salt hazardous waste incineration flue gas according to claim 2, characterized in that: A pump (16) is provided on the top of the base plate (15). The input end of the pump (16) is fixedly connected to a delivery pipe (17). The top end of the delivery pipe (17) is connected to the bottom of the gas storage tank (13). The two output ends on the left and right sides of the pump (16) are fixedly connected to a transfer pipe (18). The front end of the transfer pipe (18) is connected to an air outlet pipe (19). The top of the two air outlet pipes (19) is connected to a nozzle (20). The front end of the two air outlet pipes (19) is connected through the bottom wall of the processing box (1).

4. The denitrification device for high-salt hazardous waste incineration flue gas according to claim 2, characterized in that: A control panel (21) is fixedly connected to the top of the right side wall of the processing box (1), and an exhaust pipe (22) is connected through the bottom of the right side wall of the processing box (1). The left end of the exhaust pipe (22) is located at the bottom of the partition plate (9).

5. The denitrification device for high-salt hazardous waste incineration flue gas according to claim 1, characterized in that: A motor (23) is provided on the right side wall of the processing box (1). A rotating rod (24) is fixedly connected to the output end of the motor (23). The left end of the rotating rod (24) is rotatably connected to the inner left side wall of the processing box (1). Fixing rings (25) are fixedly connected to both the left and right ends of the middle part of the rotating rod (24). Support plates (26) are fixedly connected to the front and rear sides of the two fixing rings (25).

6. The denitrification device for high-salt hazardous waste incineration flue gas according to claim 5, characterized in that: A stirring block (27) is fixedly connected to the inner wall side of each of the two support plates (26). A first connecting ring (28) is fixedly connected to the outer side of the middle part of the rotating rod (24). A stirring rod (29) is fixedly connected to the outer side of each first connecting ring (28). The multiple stirring rods (29) and multiple stirring blocks (27) are arranged in a cross pattern. A device box (30) is provided on the outer side of both the left and right ends of the rotating rod (24).

7. The denitrification device for high-salt hazardous waste incineration flue gas according to claim 6, characterized in that: The left and right ends of the rotating rod (24) are fixedly connected with first bevel gears (31), and two second bevel gears (32) are provided on the front and rear sides of the interior of each device box (30). Each first bevel gear (31) meshes with two second bevel gears (32), and a connecting rod (33) is fixedly connected inside each of the four second bevel gears (32).

8. The high-salt hazardous waste incineration flue gas denitrification device according to claim 7, characterized in that, The other ends of the four connecting rods (33) are rotatably connected to the front and rear side walls inside the processing box (1). Two second connecting rings (34) are fixedly connected to the outside of each connecting rod (33), and a push plate (35) is fixedly connected to the outside of each second connecting ring (34).

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