Mixing and blending equipment for compound fertilizer production

Abstract

The utility model relates to the technical field of compound fertilizer production, in particular to mixing and blending equipment for compound fertilizer production. The technical problems that according to an existing mixing device, due to the fact that different raw materials have a certain degree of viscosity when mixed, the raw materials are caked or solidified in the production process, the mixing efficiency is reduced, meanwhile, the adhesive raw materials are prone to adhering to the inner wall of a tank body to be left, the raw materials of different batches are mixed unevenly, and the product quality and component uniformity are affected are solved. According to the technical scheme, the mixing and blending equipment for compound fertilizer production comprises a mixing tank, a mixing assembly, an auxiliary assembly and a supporting assembly; the rotating rod is combined with the connecting frame to be connected with the reinforcing rod for stirring and mixing, all chemical fertilizer raw materials are fully covered, uniform mixing and stirring are ensured, the chemical fertilizer raw materials are fully mixed, meanwhile, the mixing speed of the raw materials is increased, the scraping plate is installed on the outer side of the connecting frame for scraping, and residual materials on the inner wall of the mixing tank are effectively removed.

Description

Technical Field

[0001] The utility model relates to the technical field of compound fertilizer production, in particular to a mixing and blending device for compound fertilizer production. Background Art

[0002] Compound fertilizer is a fertilizer containing nitrogen, phosphorus, potassium and other nutrients, which is mixed and evenly dispersed in a certain proportion. It is a compound fertilizer. Compared with single chemical fertilizers, it has the advantages of high nutrient content, lasting fertilizer effect and easy use. The nutrient types and proportions of compound fertilizers are relatively balanced, which can meet the nutritional needs of different plants at different growth stages. Mixing and blending equipment is needed in the production of compound fertilizers. Mixing and blending equipment for compound fertilizer production is a mechanical equipment used to produce compound fertilizers. It can evenly mix a variety of fertilizer raw materials in a certain proportion to meet the nutrient needs of crops. In the production process, the existing mixing equipment usually uses a stirrer for mixing. Due to the certain degree of viscosity when different raw materials are mixed, the raw materials will agglomerate or solidify during production, and the mixing efficiency will be reduced. At the same time, the adhesive raw materials are easy to stick to the inner wall of the tank and remain, resulting in uneven mixing of raw materials of different batches, affecting the quality and uniformity of the product. Therefore, we propose a mixing and blending equipment for compound fertilizer production to solve the above problems. Utility Model Content

[0003] In order to overcome the problem of existing mixing equipment, different raw materials have a certain degree of viscosity when mixed, which causes the raw materials to clump or solidify during production, reducing the mixing efficiency. At the same time, the sticky raw materials are easy to stick to the inner wall of the tank and remain, resulting in uneven mixing of raw materials from different batches, affecting the quality and uniformity of the product.

[0004] The technical solution of the utility model is: a mixing and blending device for compound fertilizer production, comprising a mixing tank, a mixing component, an auxiliary component and a supporting component; a mixing component for uniformly mixing different fertilizer raw materials according to a predetermined formula is installed inside the mixing tank, an auxiliary component for assisting equipment to clean the residual fertilizer raw materials and impurities inside is installed at the upper end of the mixing tank, and a supporting component for supporting and fixing equipment for stable mixing production is installed at the outer end of the mixing tank.

[0005] Preferably, the reinforcing rod is connected to the connecting frame to stir and mix, fully covering all the fertilizer raw materials, ensuring that they are evenly mixed and stirred, so that the fertilizer raw materials are fully mixed, and at the same time, the mixing speed of the raw materials is accelerated. A scraper is installed on the outside of the connecting frame for scraping, which effectively removes the residual materials on the inner wall of the mixing tank, ensures the uniformity of the mixed materials, and at the same time reduces the accumulation of materials in the tank, promotes the circulation and flow of raw materials, reduces the stagnation and congestion of materials during the mixing process, and uses a transmission pipe to transmit water flow to the nozzle for spraying, so as to achieve uniform cleaning of the tank, remove residual fertilizer raw materials and impurities, and at the same time remove the residual Fertilizer raw materials and impurities are flushed to the discharge port, which effectively prevents cross contamination between different raw materials, avoids corrosion and scaling of fertilizer raw materials on the inner wall and components of the equipment, keeps the inside of the equipment clean, connects the support plate with the base and combines with the reinforcement plate to support the fixed equipment operation, provides sufficient support force, keeps the equipment stable during operation, reduces vibration and shaking, ensures that the equipment can withstand various loads during operation, uses the telescopic plate to connect the cover plate to buckle and seal the mixture, prevents the volatilization of fertilizer raw materials and the entry of external impurities, and effectively prevents dust and particulate matter from overflowing from the inside of the equipment, keeps the working environment clean, and reduces environmental pollution.

[0006] Preferably, the mixing assembly includes a rotating rod, a connecting frame, a support rod, a reinforcement rod, a connecting block, a scraper and a rotating motor. The rotating rod is located inside the mixing tank. A connecting frame is provided on the outside of the rotating rod. The connecting frames are provided with multiple groups. Reinforcement rods are provided between the multiple groups of connecting frames and the rotating rod. The connecting frames are fixedly connected to the rotating rods through the reinforcement rods. A support rod is provided between the two groups of connecting frames. The rotating rod is combined with the connecting frame to connect the reinforcement rods for stirring and mixing, so that all fertilizer raw materials are fully covered to ensure that they are evenly mixed and stirred, so that the fertilizer raw materials are fully mixed, and at the same time, the mixing speed of the raw materials is accelerated to improve production efficiency.

[0007] Preferably, a scraper is provided on the outside of the connecting frame, and multiple groups of scrapers are provided. Connecting blocks are provided between the multiple groups of scrapers and the connecting frame. One end of the rotating rod is located above the mixing tank and a rotating motor is provided. By installing a scraper on the outside of the connecting frame for scraping, residual materials on the inner wall of the mixing tank can be effectively removed to ensure the uniformity of the mixed materials. At the same time, the accumulation of materials in the tank is reduced, the circulation and flow of raw materials are promoted, the stagnation and congestion of materials during the mixing process are reduced, and the mixing efficiency is enhanced.

[0008] Preferably, the auxiliary components include a cover plate, a transmission pipe, a lock, a nozzle, a feed pipe, a fixed frame, a sealing plate, a discharge pipe and a discharge valve. A transmission pipe is provided at the upper end of the cover plate. There are two groups of transmission pipes, which extend through the cover plate to the interior. A lock is provided at one end of the transmission pipe, which is located on the outside of the cover plate. A nozzle is provided at the end of the transmission pipe away from the lock. The water flow is transmitted to the nozzle for spraying by the transmission pipe, so as to achieve uniform cleaning of the tank, remove residual fertilizer raw materials and impurities, and flush the residual fertilizer raw materials and impurities to the discharge port, thereby effectively preventing cross-contamination between different raw materials, avoiding corrosion and scaling of fertilizer raw materials on the inner wall and components of the equipment, and keeping the inside of the equipment clean.

[0009] Preferably, a feed pipe is provided on the outside of the transmission pipe, a fixed frame is provided on the upper end of the feed pipe, a sealing plate is provided above the fixed frame, a discharge pipe is located at the lower end of the mixing tank, and a discharge valve is provided on the outer wall of the discharge pipe. The discharge of the discharge pipe is controlled by the discharge valve, which facilitates the adjustment of the material flow in the production process to meet different production needs, ensure the continuity of the material in the discharge process, reduce the agglomeration and blockage of the material in the transportation process, and thus improve the product quality.

[0010] Preferably, the support assembly includes a base, a support plate, a reinforcement plate, a rotating buckle, a screw, a sleeve rod, a telescopic plate and a positioning pin. A support plate is provided at the upper end of the base. The support plates are provided in multiple groups. The multiple groups of support plates are arranged around the upper end of the base. A reinforcement plate is provided at the end of the support plate away from the base. A rotating buckle is provided on the outer side of the reinforcement plate. A screw is provided between the rotating buckle and the reinforcement plate. The reinforcement plate is movably connected to the mixing tank through the screw. The base is connected to the support plate and combined with the reinforcement plate to support the fixed equipment operation, providing sufficient supporting force to keep the equipment stable during operation, reduce vibration and shaking, ensure that the equipment can withstand various loads during operation, and improve the stability of the device.

[0011] Preferably, a telescopic plate is provided above the reinforcement plate, a sleeve plate is provided between the telescopic plate and the reinforcement plate, the telescopic plate is movably arranged along the inner part of the sleeve plate, a positioning pin is provided at the upper end of the telescopic plate, the positioning pin passes through the telescopic plate and is fixedly connected to the cover plate, and the telescopic plate is connected to the cover plate for buckling and sealing, thereby ensuring the sealing of the equipment during operation, preventing the volatilization of fertilizer raw materials and the entry of external impurities, and effectively preventing dust and particulate materials from overflowing from the inside of the equipment, keeping the working environment clean, and reducing environmental pollution.

[0012] Beneficial effects of the utility model:

[0013] 1. Compared with traditional mixing and blending equipment, the stirring and mixing is carried out by combining the rotating rod with the connecting frame to connect the reinforcing rod, fully covering all the fertilizer raw materials, ensuring that they are evenly mixed and stirred, so that the fertilizer raw materials can be fully mixed, and at the same time speeding up the mixing speed of the raw materials. A scraper is installed on the outside of the connecting frame for scraping, which effectively removes the residual materials on the inner wall of the mixing tank, ensures the uniformity of the mixed materials, and reduces the accumulation of materials in the tank, promotes the circulation and flow of raw materials, reduces the stagnation and congestion of materials in the mixing process, and enhances the mixing efficiency. The water flow is transmitted to the nozzle through the transmission pipe to achieve uniform cleaning of the tank, remove the residual fertilizer raw materials and impurities, and flush the residual fertilizer raw materials and impurities to the discharge port, effectively preventing cross-contamination between different raw materials, avoiding corrosion and scaling of fertilizer raw materials on the inner wall and components of the equipment, and keeping the inside of the equipment clean.

[0014] 2. The base is connected to the support plate and the reinforcement plate to support the fixed equipment to provide sufficient support force to keep the equipment stable during operation, reduce vibration and shaking, ensure that the equipment can withstand various loads during operation, and improve the stability of the device. The telescopic plate is used to connect the cover plate for buckling and sealing to ensure the sealing of the equipment during operation, prevent the volatilization of fertilizer raw materials and the entry of external impurities, and effectively prevent dust and particulate materials from overflowing from the inside of the equipment, keep the working environment clean, and reduce environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the hybrid component of the utility model;

[0017] Figure 3 This is a schematic diagram of the auxiliary component structure of the utility model;

[0018] Figure 4 This is a schematic diagram of the support assembly structure of the utility model.

[0019] Explanation of the accompanying drawings: 1. mixing tank; 2. mixing assembly; 201. rotating rod; 202. connecting frame; 203. supporting rod; 204. reinforcing rod; 205. connecting block; 206. scraper; 207. rotating motor; 3. auxiliary assembly; 301. cover plate; 302. transmission pipe; 303. locking buckle; 304. nozzle; 305. feeding pipe; 306. fixing frame; 307. sealing plate; 308. discharging pipe; 309. discharging valve; 4. supporting assembly; 401. base; 402. supporting plate; 403. reinforcing plate; 404. rotating buckle; 405. screw; 406. sleeve rod; 407. telescopic plate; 408. positioning nail. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] See also Figure 1-4 The utility model provides an embodiment: a mixing and blending device for compound fertilizer production, comprising a mixing tank 1, a mixing component 2, an auxiliary component 3 and a supporting component 4; the interior of the mixing tank 1 is equipped with a mixing component 2 for uniformly mixing different fertilizer raw materials according to a predetermined formula, the upper end of the mixing tank 1 is equipped with an auxiliary component 3 for auxiliary equipment to clean the residual fertilizer raw materials and impurities inside, and the outer end of the mixing tank 1 is equipped with a supporting component 4 for supporting and fixing the equipment for stable mixing production.

[0022] See also Figure 1-2 In this embodiment, the mixing assembly 2 includes a rotating rod 201, a connecting frame 202, a support rod 203, a reinforcement rod 204, a connecting block 205, a scraper 206 and a rotating motor 207. The rotating rod 201 is located inside the mixing tank 1. A connecting frame 202 is provided on the outside of the rotating rod 201. The connecting frame 202 is provided with multiple groups. A reinforcement rod 204 is provided between the multiple groups of connecting frames 202 and the rotating rod 201. The connecting frame 202 is fixedly connected to the rotating rod 201 through the reinforcement rod 204. A support rod 203 is provided between the two groups of connecting frames 202. The rotating rod 201 is combined with the connecting frame 202 to connect the reinforcement rod 204 for stirring and mixing, and all the fertilizer raw materials are fully covered. The materials are ensured to be evenly mixed and stirred, so that the fertilizer raw materials can be fully mixed, and at the same time, the mixing speed of the raw materials is accelerated to improve the production efficiency. A scraper 206 is arranged on the outside of the connecting frame 202, and a plurality of groups of scrapers 206 are arranged. A connecting block 205 is arranged between the plurality of groups of scrapers 206 and the connecting frame 202. One end of the rotating rod 201 is located above the mixing tank 1 and a rotating motor 207 is arranged. The scraper 206 is installed on the outside of the connecting frame 202 for scraping, so that the residual materials on the inner wall of the mixing tank 1 are effectively removed, so as to ensure the uniformity of the mixed materials, and at the same time reduce the accumulation of materials in the tank, promote the circulation and flow of raw materials, reduce the stagnation and congestion of materials in the mixing process, and enhance the mixing efficiency.

[0023] See also Figure 1-3In this embodiment, the auxiliary component 3 includes a cover plate 301, a transmission pipe 302, a lock 303, a nozzle 304, a feed pipe 305, a fixing frame 306, a sealing plate 307, a discharge pipe 308 and a discharge valve 309. The upper end of the cover plate 301 is provided with a transmission pipe 302, and the transmission pipe 302 is provided with two groups. The two groups of transmission pipes 302 extend to the inside through the cover plate 301. One end of the transmission pipe 302 is located on the outer side of the cover plate 301 and is provided with a lock 303. The end of the transmission pipe 302 away from the lock 303 is provided with a nozzle 304. By using the transmission pipe 302 to transmit water to the nozzle 304 for spraying, uniform cleaning of the tank is achieved, and residual fertilizer raw materials and impurities are removed. At the same time, the residual fertilizer raw materials are The materials and impurities are flushed to the discharge port, which effectively prevents cross contamination between different raw materials, avoids corrosion and scaling of fertilizer raw materials on the inner wall and components of the equipment, and keeps the inside of the equipment clean. A feed pipe 305 is provided on the outside of the transmission pipe 302, and a fixed frame 306 is provided on the upper end of the feed pipe 305. A sealing plate 307 is provided above the fixed frame 306. A discharge pipe 308 is located at the lower end of the mixing tank 1, and a discharge valve 309 is provided on the outer wall of the discharge pipe 308. The discharge of the discharge pipe 308 is controlled by the discharge valve 309, which is convenient for adjusting the material flow in the production process, meeting different production needs, ensuring the continuity of the material in the discharge process, and reducing the agglomeration and blockage of the material in the transportation process, thereby improving the product quality.

[0024] See also Figure 2-4 In this embodiment, the support assembly 4 includes a base 401, a support plate 402, a reinforcement plate 403, a rotating buckle 404, a screw 405, a sleeve rod 406, a telescopic plate 407 and a positioning nail 408. The upper end of the base 401 is provided with a support plate 402, and the support plate 402 is provided with multiple groups. The multiple groups of support plates 402 are arranged around the upper end of the base 401, and the end of the support plate 402 away from the base 401 is provided with a reinforcement plate 403, and the outer side of the reinforcement plate 403 is provided with a rotating buckle 404, and a screw 405 is provided between the rotating buckle 404 and the reinforcement plate 403. The reinforcement plate 403 is movably connected to the mixing tank 1 through the screw 405. By adopting the base 401 to connect the support plate 402 and the reinforcement plate 403 to support the operation of the fixed equipment, sufficient Sufficient supporting force can keep the equipment stable during operation, reduce vibration and shaking, ensure that the equipment can withstand various loads during operation, and improve the stability of the device. A telescopic plate 407 is provided above the reinforcement plate 403, and a sleeve plate is provided between the telescopic plate 407 and the reinforcement plate 403. The telescopic plate 407 is movably arranged along the inner part of the sleeve plate. A positioning pin 408 is provided on the upper end of the telescopic plate 407. The positioning pin 408 passes through the telescopic plate 407 and is fixedly connected to the cover plate 301. The telescopic plate 407 is connected to the cover plate 301 for buckling and sealing, thereby ensuring the sealing of the equipment during operation, preventing the volatilization of fertilizer raw materials and the entry of external impurities, and effectively preventing dust and particulate materials from overflowing from the inside of the equipment, keeping the working environment clean, and reducing environmental pollution.

[0025] When working, first open the sealing plate 307 manually, let the required mixed raw materials flow from the fixed frame 306 to the feeding pipe and fall into the mixing tank 1, close the sealing plate 307 after the raw materials are added, start the rotating motor 207, use the rotating motor 207 to drive the rotating rod 201 to drive the connecting frame 202 to rotate, use the rotating rod 201 in combination with the connecting frame 202 to connect the reinforcing rod 204 to stir and mix, fully cover all the fertilizer raw materials, ensure that they are evenly mixed and stirred, so that the fertilizer raw materials can be fully mixed, and at the same time speed up the mixing speed of the raw materials. During the mixing process, the outer side of the connecting frame 202 The installation of the scraper 206 effectively reduces the accumulation of materials in the tank, promotes the circulation and flow of raw materials, reduces the stagnation and congestion of materials during the mixing process, and realizes the mixed production of multiple raw materials. When the raw materials need to be cleaned after mixing, the water pipe is preferentially fixed to the transmission docking with the lock 303, and the water flow is transmitted from the transmission pipe 302 to the nozzle 304 for spraying. At the same time, the rotating rod 201 is started to rotate, and the scraper 206 is combined with the nozzle 304 to effectively remove the residual material on the inner wall of the mixing tank 1, and the residual fertilizer raw materials and impurities are flushed to the discharge port to prevent cross contamination between different raw materials and keep the inside of the equipment clean.

[0026] During the raw material mixing process, the base 401 is used to connect the support plate 402 and the reinforcement plate 403 to support the fixed equipment operation, provide sufficient support force, so that the equipment remains stable during operation, reduce vibration and shaking, and ensure that the equipment can withstand various loads during operation. After the equipment is processed, the discharge valve 309 is manually opened to control the discharge of the discharge pipe 308, which is convenient for adjusting the material flow in the production process, ensuring the continuity of the material in the discharge process, and reducing the agglomeration and blockage of the material during the transportation process. After the raw materials are discharged, the positioning pins 408 are connected and rotated and pulled out by tools, and the cover plate 301 is connected by the telescopic plate 407 to open the cover plate 301 along the lifting and lowering adjustment inside the sleeve plate, and the internal situation of the mixing tank 1 is checked and maintained, and maintenance and cleaning are carried out in time to realize the mixed and blended production of compound fertilizers.

[0027] Through the above steps, the rotating rod 201 is combined with the connecting frame 202 to connect the reinforcing rod 204 for stirring and mixing, fully covering all the fertilizer raw materials, ensuring that they are evenly mixed and stirred, so that the fertilizer raw materials are fully mixed, and at the same time, the mixing speed of the raw materials is accelerated. The scraper 206 is installed on the outside of the connecting frame 202 for scraping, and the residual materials on the inner wall of the mixing tank 1 are effectively removed to ensure the uniformity of the mixed materials. At the same time, the accumulation of materials in the tank is reduced, the circulation and flow of raw materials are promoted, and the stagnation and congestion of materials in the mixing process are reduced. The transmission pipe 302 is used to transmit the water flow to the nozzle 304 for spraying, so as to achieve uniform cleaning of the tank and remove the residual fertilizer raw materials and impurities. The residual fertilizer raw materials and impurities are flushed to the discharge port, which effectively prevents cross contamination between different raw materials, avoids corrosion and scaling of fertilizer raw materials on the inner wall and components of the equipment, keeps the inside of the equipment clean, connects the support plate 402 with the reinforcement plate 403 through the base 401 to support the fixed equipment operation, provides sufficient support force, keeps the equipment stable during operation, reduces vibration and shaking, and ensures that the equipment can withstand various loads during operation, uses the telescopic plate 407 to connect the cover plate 301 to seal and mix, prevents the volatilization of fertilizer raw materials and the entry of external impurities, and effectively prevents dust and particulate materials from overflowing from the inside of the equipment, keeps the working environment clean, and reduces environmental pollution.

[0028] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A mixing and preparing device for compound fertilizer production, comprising a mixing tank (1); Features: The invention also comprises a mixing component (2), an auxiliary component (3) and a supporting component (4); the mixing tank (1) is internally installed with a mixing component (2) for uniformly mixing different fertilizer raw materials according to a predetermined formula; the upper end of the mixing tank (1) is installed with an auxiliary component (3) for assisting equipment to clean the residual fertilizer raw materials and impurities inside; the outer end of the mixing tank (1) is installed with a supporting component (4) for supporting and fixing equipment for stable mixing production.

2. A mixing and preparing equipment for compound fertilizer production according to claim 1, Features: The mixing assembly (2) comprises a rotating rod (201), a connecting frame (202), a support rod (203), a reinforcement rod (204), a connecting block (205), a scraper (206) and a rotating motor (207); the rotating rod (201) is located inside the mixing tank (1); a connecting frame (202) is provided outside the rotating rod (201); the connecting frame (202) is provided with a plurality of groups; a reinforcement rod (204) is provided between the plurality of groups of connecting frames (202) and the rotating rod (201); the connecting frame (202) is fixedly connected to the rotating rod (201) via the reinforcement rod (204); and a support rod (203) is provided between two groups of connecting frames (202).

3. A mixing and blending equipment for compound fertilizer production according to claim 2, Features: A scraper (206) is provided on the outer side of the connecting frame (202), and a plurality of groups of scrapers (206) are provided. A connecting block (205) is provided between the plurality of groups of scrapers (206) and the connecting frame (202). A rotating motor (207) is provided at one end of the rotating rod (201) located above the mixing tank (1).

4. A mixing and preparing equipment for compound fertilizer production according to claim 1, Features: The auxiliary component (3) comprises a cover plate (301), a transmission pipe (302), a lock (303), a nozzle (304), a feed pipe (305), a fixing frame (306), a sealing plate (307), a discharge pipe (308) and a discharge valve (309). A transmission pipe (302) is provided at the upper end of the cover plate (301). Two groups of transmission pipes (302) are provided. The two groups of transmission pipes (302) pass through the cover plate (301) and extend to the inside. One end of the transmission pipe (302) is located on the outer side of the cover plate (301) and is provided with a lock (303). The end of the transmission pipe (302) away from the lock (303) is provided with a nozzle (304).

5. A mixing and preparing equipment for compound fertilizer production according to claim 4, Features: A feed pipe (305) is provided on the outside of the transmission pipe (302), a fixing frame (306) is provided on the upper end of the feed pipe (305), a sealing plate (307) is provided above the fixing frame (306), a discharge pipe (308) is located at the lower end of the mixing tank (1), and a discharge valve (309) is provided on the outer wall of the discharge pipe (308).

6. A mixing and preparing equipment for compound fertilizer production according to claim 4, Features: The support assembly (4) comprises a base (401), a support plate (402), a reinforcement plate (403), a rotating buckle (404), a screw (405), a sleeve rod (406), a telescopic plate (407) and a positioning pin (408). The upper end of the base (401) is provided with a support plate (402), and the support plate (402) is provided with a plurality of groups. The plurality of groups of support plates (402) are arranged around the upper end of the base (401). The end of the support plate (402) away from the base (401) is provided with a reinforcement plate (403), and a rotating buckle (404) is provided on the outer side of the reinforcement plate (403). A screw (405) is provided between the rotating buckle (404) and the reinforcement plate (403), and the reinforcement plate (403) is movably connected to the mixing tank (1) through the screw (405).

7. A mixing and preparing equipment for compound fertilizer production according to claim 6, Features: A telescopic plate (407) is provided above the reinforcement plate (403), a sleeve plate is provided between the telescopic plate (407) and the reinforcement plate (403), the telescopic plate (407) is movably arranged inside the sleeve plate, a positioning pin (408) is provided at the upper end of the telescopic plate (407), and the positioning pin (408) passes through the telescopic plate (407) and is fixedly connected to the cover plate (301).

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