A reactor for the production of dioxolane

Abstract

This invention discloses a reactor for the production of dioxolane, belonging to the field of reactor technology. It includes a vessel assembly, with a lid assembly fixedly installed at the upper end of the vessel assembly. A heating assembly is fixedly installed inside the vessel assembly. The vessel assembly includes a reaction vessel, and both the lid assembly and the heating assembly are fixedly installed on the reaction vessel. The lid assembly includes a cover, with a feed pipe and an exhaust pipe fixedly installed at the upper end of the cover. A stirring assembly is fixedly installed in the middle of the interior of the reaction vessel, with its upper end extending into the interior of the lid assembly. During use, fan blades and vortex blades facilitate the driving and stirring of the stirring assembly during gas phase discharge and hemiacetal injection. The heating assembly, arranged in an array of discs, facilitates heating of the interior of the reaction vessel, improving heat utilization efficiency, reducing energy consumption, and facilitating dioxolane production. It is easy to use, and the lid assembly facilitates connection and maintenance.

Description

Technical Field

[0001] This invention relates to a reactor for the production of dioxolane, belonging to the field of reactor technology. Background Technology

[0002] Dioxolane is an organic compound, a colorless and transparent liquid, soluble in water, ethanol, ether, and acetone. It is an excellent organic solvent, commonly used as a solvent for oils and fats, an extractant, and an electrolytic solvent for lithium batteries. It is stable in chlorine-based solvents. In the production of dioxolane, it is now mostly synthesized by reacting hemiacetal (ethylene glycol and formaldehyde) in the presence of p-toluenesulfonic acid catalyst. This reaction is carried out at a boiling temperature of 100-110°C. During the reaction, a reactor is required for continuous synthesis and heating.

[0003] For example, CN101282958B discloses a method for preparing dioxolane by reacting ethylene glycol (1) with an aqueous formaldehyde solution (2) in the presence of a catalyst. The method is characterized in that the reaction is carried out in a reactive distillation column (RDK). The raw materials, ethylene glycol (1) and the aqueous formaldehyde solution (2), are fed into the reactive distillation column (RDK) in the middle region, and a dioxolane-containing stream (3) is taken out in the upper region of the reactive distillation column (RDK), along with a bottom stream (4) containing components with boiling points higher than dioxolane.

[0004] For example, publication number CN106883209B discloses a process for preparing dioxolane, belonging to the downstream deep processing field of ethylene glycol. This process is applied in many fields such as fine chemical intermediates, synthetic materials, and electronic chemicals in the lithium battery industry. Specifically, formaldehyde and ethylene glycol react in a pre-reactor and then enter a catalytic distillation column for catalytic reaction and distillation. Dioxolane with a purity of 93.5%–94.5% is obtained at the top of the column. The top product is then dehydrated and separated using a molecular sieve membrane device, resulting in a product purity of 95.0%–99.0%. Further separation in a distillation column yields a dioxolane product with a purity of 99.9%. The process of this invention, especially the separation process, consists of three parts: a pre-reaction-catalytic distillation column system, a molecular sieve membrane system, and an atmospheric pressure distillation system. This shortens the process flow, reduces energy consumption, and has strong process integration. It allows for appropriate modification of traditional processes, requires less investment, has low operating costs, and is suitable for industrial production.

[0005] During the production synthesis, a reactor is required for synthesis and heating. The reaction mixture inside the reactor is in a boiling state, and hemiacetal is continuously added. Simultaneously, the gaseous product is discharged from the reactor; the product is an azeotrope composed of dioxolane and water, with an azeotrope temperature of 71.6 degrees Celsius. Therefore, it is necessary to ensure uniform heat within the reactor and to facilitate thorough mixing of the hemiacetal and the toluenesulfonic acid catalyst.

[0006] For example, CN108579638A discloses a reactor comprising a forward agitator, a central stirring shaft, a reverse agitator, a hollow stirring shaft, a sun gear, planetary gears, a frame, a planetary carrier, a reducer, a coupling, a gear ring, and a tank. The frame is mounted on top of the tank, and the reducer and planetary carrier are fixed to the frame. The reducer is connected to the central stirring shaft via the coupling, and the sun gear and forward agitator are mounted on the central stirring shaft. The gear ring is connected to the hollow stirring shaft, and the reverse agitator is mounted on the hollow stirring shaft. The central stirring shaft passes through the hollow stirring shaft and is rotatably supported on the frame and the hollow stirring shaft, respectively. The forward and reverse agitators in this reactor counter-stir, which to some extent disrupts the material's rotation and improves the stirring effect. However, in use, energy consumption is high, and it is not convenient to heat the center of the reactor, affecting the synthesis of dioxolane, making it inconvenient to use. Summary of the Invention

[0007] The purpose of this invention is to provide a reactor for the production of dioxolane in order to solve the above-mentioned problems. It can facilitate driving stirring during gas phase discharge and hemiacetal injection, and can facilitate heating of the inside of the reactor through heating components, thereby improving heat utilization and reducing energy consumption.

[0008] This invention achieves the above-mentioned objective through the following technical solution: a reactor for the production of dioxolane, comprising a vessel body assembly, a vessel cover assembly fixedly installed at the upper end of the vessel body assembly, and a heating assembly fixedly installed inside the vessel body assembly. The vessel body assembly includes a reaction vessel, and both the vessel cover assembly and the heating assembly are fixedly installed on the reaction vessel. The inlet and outlet ends of the heating assembly extend to the outside of the reaction vessel. The vessel cover assembly includes a cover body, and a feed pipe and a flue pipe are fixedly installed at the upper end of the cover body. A stirring assembly is fixedly installed at the middle position inside the reaction vessel, and the upper end of the stirring assembly extends into the interior of the vessel cover assembly. In use, after the reaction vessel in the vessel body assembly is installed in the designated position... The reactor lid assembly is installed on the reactor vessel, and the external hemiacetal supply pipe is connected to the feed pipe, allowing the hemiacetal raw material to enter the reactor vessel. Hot steam enters the heating assembly through the inlet and outlet ends, uniformly heating the reactor vessel. During the reaction, the generated gas phase is discharged through the exhaust pipe, driving the stirring assembly. Because of continuous synthesis, hemiacetal is continuously injected through the feed pipe, driving the stirring assembly during injection. This eliminates the need for an electric drive for the stirring assembly during production, improving energy efficiency and simplifying operation.

[0009] Preferably, to facilitate the reaction, support legs are uniformly fixedly installed at the lower end of the reactor, and fixing ears are uniformly fixedly installed on the outer side of the lower end of the reactor. A heat insulation cover is fixedly installed on the outer side of the reactor, and protective plates are fixedly installed in a circumferential array on the outer side of the heat insulation cover. The protective plates have an arc-shaped structure, and springs are uniformly fixedly installed on the upper and lower ends of one side of the protective plate. The protective plate is fixedly installed on the outer side of the heat insulation cover by the springs. A connecting flange is fixedly installed at the upper end of the reactor, and the reactor lid assembly is fixedly installed on the upper end of the connecting flange. A discharge pipe is fixedly installed on one side of the lower end of the reactor. The middle position inside the reactor is fixed... The stirring assembly is mounted on a rotating disc, with its lower end rotatably mounted on the disc. During use, it is placed using the support legs and secured by the fixing ears. A vacuum is created inside the insulation cover to improve the insulation effect on the reactor. A spring-loaded protective plate further protects the reactor and prevents contact with the reactor, improving safety. The discharge pipe facilitates the discharge of the synthesized dioxolane for continuous use. The rotating disc allows the stirring assembly to rotate, improving reaction efficiency and simplifying operation.

[0010] Preferably, for ease of installation and maintenance, a connecting plate is fixedly installed at the lower end of the cover, and connecting bolts are evenly fixedly installed on the connecting plate. The connecting plate is fixedly installed on the connecting flange by the connecting bolts, and the cover seals the upper end of the reactor. A sleeve is fixedly installed at the lower end of the inside of the cover, and the upper end of the stirring assembly extends into the inside of the sleeve. The exhaust pipe is fixedly installed at the upper end of the cover and located above the sleeve. An extension pipe is fixedly installed at the lower end of the feed pipe, and the extension pipe extends to one side of the lower end of the sleeve. An auxiliary material pipe is fixedly installed on one side of the upper end of the cover, and the other side of the upper end of the cover is fixed with... The reactor is equipped with a maintenance tube, the upper end of which is fixedly fitted with a sealing cap. During use, it is easily fixed to the connecting flange on the reactor via the connecting disc and connecting bolts. The extension tube facilitates the impact of the hemiacetal onto the stirring assembly during injection, driving the stirring assembly. The auxiliary material tube facilitates the injection of catalytic methylbenzenesulfonic acid catalyst into the reactor. The sleeve allows the upper end of the stirring assembly to extend into the sleeve. During gas phase discharge, the gas flow drives the stirring assembly, facilitating its rotation and stirring the interior of the reactor.

[0011] Preferably, to improve heating uniformity, the heating assembly includes a heating plate, and connecting rods are uniformly fixedly installed on the lower outer side of the heating plate. The heating plate is fixedly installed inside the reactor via the connecting rods, and a spiral-shaped heating tube is fixedly installed at the lower end of the heating plate. The heating plates are arranged in a vertical array inside the reactor, and the upper and lower heating tubes are connected end-to-end. An exhaust pipe is fixedly installed at one end of the upper heating tube, and an inlet pipe is fixedly installed at one end of the lower heating tube. Both the exhaust pipe and the inlet pipe penetrate the reactor and extend to the outside of the reactor. Through holes are uniformly opened on the upper surface of the heating plate. Baffle plates are uniformly fixed between the through holes, and a collar is fixedly installed at the middle position of the heating plate. The stirring assembly is rotatably installed between the collars. During use, the inlet pipe and the outlet pipe facilitate the flow of hot steam inside the spiral-shaped heating tube to heat the medium inside the reactor. The uniform array distribution improves the uniformity of heating of the medium. The heating plate and the baffle plates installed on the heating plate prevent the medium from forming vortices during stirring. The collars provide support for the stirring assembly, allowing it to rotate stably between the collars and stir the medium inside the reactor.

[0012] Preferably, to facilitate improved reaction efficiency and stirring, the stirring assembly includes a rotating shaft rotatably mounted between the collars, with stirring blades evenly fixedly mounted on the rotating shaft between the heating plates. A fan blade is fixedly mounted at the upper end of the rotating shaft, extending into the interior of the vessel lid assembly. A vortex blade is fixedly mounted at the upper end of the rotating shaft below the fan blade. During operation, the fan blade extends into the sleeve, and the gas flow during gas phase discharge drives the fan blade, facilitating the rotation of the rotating shaft. This allows the stirring blades to stir the medium. Furthermore, during the injection of hemiacetal, the hemiacetal impacts the vortex blade, further enhancing the driving effect on the rotating shaft, causing the stirring blades to rotate, facilitating stirring, and improving production efficiency.

[0013] The beneficial effects of this invention are: when in use, by adopting fan blades and vortex blades, it is convenient to drive the stirring component to stir during gas phase discharge and hemiacetal injection; and by using the heating components in an array of disks, it is convenient to heat the inside of the reactor, improve the heat utilization efficiency, reduce energy consumption, facilitate the production of dioxolane, and make it easy to use; and by using the reactor lid component, it is convenient to plug in and maintain. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 This is a partial structural diagram of the present invention.

[0016] Figure 3 This is a schematic diagram of the overall structure from another angle in this invention.

[0017] Figure 4 This is a schematic diagram of the structure of the vessel body component after being cut open in this invention.

[0018] Figure 5 This is a structural diagram showing the location of the protective plate in this invention.

[0019] Figure 6 This is a schematic diagram of the structure of the covering component in this invention.

[0020] Figure 7 This is a partial structural diagram of the heating plate location in this invention.

[0021] Figure 8 This is a schematic diagram of the stirring assembly in this invention.

[0022] In the diagram: 1. Reactor body assembly; 101. Reactor; 102. Support leg; 103. Fixing lug; 104. Insulation cover; 105. Protective plate; 106. Spring; 107. Connecting flange; 108. Discharge pipe; 109. Rotating disc; 2. Reactor lid assembly; 201. Lid; 202. Feed pipe; 203. Exhaust pipe; 204. Connecting disc; 205. Connecting bolt; 206. Sleeve; 2 07. Extension tube; 208. Auxiliary material tube; 209. Inspection tube; 2010. Sealing cover; 3. Heating assembly; 301. Heating plate; 302. Connecting rod; 303. Heating tube; 304. Exhaust pipe; 305. Inlet pipe; 306. Through hole; 307. Baffle plate; 308. Collar; 4. Stirring assembly; 401. Rotating shaft; 402. Stirring blade; 403. Fan blade; 404. Vortex blade. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-8As shown, a reactor for the production of dioxolane includes a vessel body assembly 1, a vessel cover assembly 2 fixedly installed at the upper end of the vessel body assembly 1, and a heating assembly 3 fixedly installed inside the vessel body assembly 1. The vessel body assembly 1 includes a reaction vessel 101, and both the vessel cover assembly 2 and the heating assembly 3 are fixedly installed on the reaction vessel 101. The inlet and outlet ends of the heating assembly 3 extend to the outside of the reaction vessel 101. The vessel cover assembly 2 includes a cover body 201, and a feed pipe 202 and a flue pipe 203 are fixedly installed at the upper end of the cover body 201. A stirring assembly 4 is fixedly installed at the middle position inside the reaction vessel 101, and the upper end of the stirring assembly 4 extends into the interior of the vessel cover assembly 2. In use, after installing the reaction vessel 101 in the vessel body assembly 1 in the set position, the... The lid assembly 2 is installed on the reactor 101, and the external hemiacetal supply pipe is connected to the feed pipe 202, allowing the hemiacetal raw material to enter the interior of the reactor 101. Hot steam enters the interior of the heating assembly 3 through the inlet and outlet ends, uniformly heating the interior of the reactor 101. During the reaction, the gas phase generated by the stirring assembly 4 is discharged through the exhaust pipe 203, which drives the stirring assembly 4. Due to continuous synthesis, hemiacetal is continuously injected through the feed pipe 202, which drives the stirring assembly 4. This eliminates the need for an electric drive for the stirring assembly 4 during production, improving energy efficiency and simplifying operation.

[0025] like Figure 4As shown, support legs 102 are uniformly fixedly installed at the lower end of the reactor 101, and fixing ears 103 are uniformly fixedly installed on the outer side of the lower end of the reactor 101. A heat insulation cover 104 is fixedly installed on the outer side of the reactor 101, and protective plates 105 are fixedly installed in a circumferential array on the outer side of the heat insulation cover 104. The protective plates 105 have an arc-shaped structure. Springs 106 are uniformly fixedly installed on the upper and lower ends of one side of the protective plate 105, and the protective plate 105 is fixedly installed on the outer side of the heat insulation cover 104 by the springs 106. A connecting flange 107 is fixedly installed at the upper end of the reactor 101, and the reactor cover assembly 2 is fixedly installed on the upper end of the connecting flange 107. A discharge pipe 108 is fixedly installed on one side of the lower end of the reactor 101. The interior of the reactor 101... A rotating disk 109 is fixedly installed in the middle position. The lower end of the stirring assembly 4 is rotatably mounted on the rotating disk 109. During use, it is placed by the support leg 102 and fixed by the fixing ear 103. The heat insulation cover 104 creates a vacuum inside, improving the heat insulation effect of the reactor 101. The protective plate 105 installed by the spring 106 further protects the reactor 101 and prevents contact with the reactor 101, improving safety during use. The discharge pipe 108 facilitates the discharge of the synthesized dioxolane for continuous use. The rotating disk 109 allows the stirring assembly 4 to rotate on the disk, improving the reaction effect during use and making it convenient to use.

[0026] like Figure 6As shown, a connecting plate 204 is fixedly installed at the lower end of the cover 201, and connecting bolts 205 are evenly fixedly installed on the connecting plate 204. The connecting plate 204 is fixedly installed on the connecting flange 107 by the connecting bolts 205. The cover 201 seals the upper end of the reactor 101. A sleeve 206 is fixedly installed at the lower end of the inside of the cover 201, and the upper end of the stirring assembly 4 extends into the inside of the sleeve 206. The exhaust pipe 203 is fixedly installed at the upper end of the cover 201 and is located above the sleeve 206. An extension pipe 207 is fixedly installed at the lower end of the feed pipe 202, and the extension pipe 207 extends to one side of the lower end of the sleeve 206. An auxiliary material pipe 208 is fixedly installed on one side of the upper end of the cover 201, and the other side of the upper end of the cover 201... A maintenance pipe 209 is fixedly installed, and a sealing cap 2010 is fixedly installed at the upper end of the maintenance pipe 209. During use, it is easily fixed to the connecting flange 107 on the reactor 101 through the connecting plate 204 and connecting bolts 205. Through the extension pipe 207, the semi-acetal is allowed to impact the stirring assembly 4 during injection, driving the stirring assembly 4. Through the auxiliary material pipe 208, the catalytic toluenesulfonic acid catalyst is easily injected into the interior of the reactor 101. Through the sleeve 206, the upper end of the stirring assembly 4 can be easily extended into the interior of the sleeve 206. During gas phase discharge, the gas flow drives the stirring assembly 4, facilitating the rotation of the stirring assembly 4 and stirring the interior of the reactor 101.

[0027] like Figure 7As shown, the heating assembly 3 includes a heating plate 301, and connecting rods 302 are uniformly fixedly installed on the outer side of the lower end of the heating plate 301. The heating plate 301 is fixedly installed inside the reactor 101 through the connecting rods 302, and a spiral-shaped heating tube 303 is fixedly installed at the lower end of the heating plate 301. The heating plates 301 are arranged in a vertical array inside the reactor 101, and the upper and lower heating tubes 303 are connected end to end. An exhaust pipe 304 is fixedly installed at one end of the upper heating tube 303, and an inlet pipe 305 is fixedly installed at one end of the lower heating tube 303. Both the exhaust pipe 304 and the inlet pipe 305 penetrate the reactor 101 and extend to the outer side of the reactor 101. Through holes 306 are uniformly opened on the upper surface of the heating plate 301. Baffle plates 307 are uniformly fixedly installed between the through holes 306 on the surface. A collar 308 is fixedly installed in the middle of the heating plate 301, and the stirring assembly 4 is rotatably installed between the collars 308. During use, the hot steam flows through the inlet pipe 305 and the exhaust pipe 304 to heat the medium inside the reactor 101 through the spiral structure heating tube 303. The uniform array distribution improves the uniformity of heating of the medium. The heating plate 301 and the baffle plates 307 installed on the heating plate 301 prevent the medium from forming vortices during stirring. The collars 308 support the stirring assembly 4, allowing the stirring assembly 4 to rotate stably between the collars 308 to stir the medium inside the reactor 101.

[0028] like Figure 8 As shown, the stirring assembly 4 includes a rotating shaft 401, which is rotatably mounted between collars 308. Stirring blades 402 are uniformly fixedly mounted on the rotating shaft 401, located between heating plates 301. A fan blade 403 is fixedly mounted at the upper end of the rotating shaft 401, extending into the interior of the vessel cover assembly 2. A vortex blade 404 is fixedly mounted at the upper end of the rotating shaft 401 below the fan blade 403. During use, the fan blade 403 extends into the interior of the sleeve 206. When the gas phase is discharged, the gas flow drives the fan blade 403, facilitating the driving of the rotating shaft 401. This causes the stirring blades 402 to stir the medium. Furthermore, when hemiacetal is injected, the hemiacetal impacts the vortex blade 404, further enhancing the driving effect on the rotating shaft 401, causing the stirring blades 402 to rotate, facilitating stirring and improving production efficiency.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A reactor for the production of dioxolane, characterized in that: The reactor includes a vessel body assembly (1), a vessel cover assembly (2) is fixedly installed on the upper end of the vessel body assembly (1), and a heating assembly (3) is fixedly installed inside the vessel body assembly (1). The vessel body assembly (1) includes a reactor (101). The vessel cover assembly (2) and the heating assembly (3) are both fixedly installed on the reactor (101). The inlet and outlet ends of the heating assembly (3) extend to the outside of the reactor (101). The vessel cover assembly (2) includes a cover body (201). The upper end of the cover body (201) is fixedly installed with a feed pipe (202) and a smoke exhaust pipe (203). A stirring assembly (4) is fixedly installed in the middle of the interior of the reactor (101). The upper end of the stirring assembly (4) extends into the interior of the vessel cover assembly (2). The heating assembly (3) includes a heating plate (301), and a connecting rod (302) is uniformly fixedly installed on the lower outer side of the heating plate (301). The heating plate (301) is fixedly installed inside the reactor (101) through the connecting rod (302). A spiral heating tube (303) is fixedly installed at the lower end of the heating plate (301). The heating plate (301) is arranged in a vertical array inside the reactor (101). The heating tubes (303) at the upper and lower ends are connected end to end. An exhaust pipe (304) is fixedly installed at one end of the upper heating tube (303), and an air inlet pipe (305) is fixedly installed at one end of the lower heating tube (303). Both the exhaust pipe (304) and the air inlet pipe (305) penetrate the reactor (101) and extend to the outside of the reactor (101). The upper surface of the heating plate (301) is uniformly provided with through holes (306), and the upper surface of the heating plate (301) is uniformly fixedly installed with baffles (307) between the through holes (306). A collar (308) is fixedly installed in the middle position of the heating plate (301), and the stirring assembly (4) is rotatably installed between the collars (308). The stirring assembly (4) includes a rotating shaft (401), which is rotatably mounted between the collars (308). Stirring blades (402) are uniformly fixedly mounted on the rotating shaft (401). The stirring blades (402) are located between the heating plates (301). A fan blade (403) is fixedly mounted on the upper end of the rotating shaft (401). The fan blade (403) extends into the interior of the lid assembly (2). A vortex blade (404) is fixedly mounted on the upper end of the rotating shaft (401) below the fan blade (403).

2. The reactor for producing dioxolane according to claim 1, characterized in that: The lower end of the reactor (101) is uniformly fixed with support legs (102), and the lower outer side of the reactor (101) is uniformly fixed with fixing ears (103). The outer side of the reactor (101) is covered and fixed with a heat insulation cover (104), and the outer side of the heat insulation cover (104) is fixedly fixed with a protective plate (105) in a circular array. The protective plate (105) has an arc-shaped structure.

3. The reactor for producing dioxolane according to claim 2, characterized in that: Springs (106) are evenly fixedly installed on the upper and lower ends of one side of the protective plate (105), and the protective plate (105) is fixedly installed on the outside of the heat insulation cover (104) by the springs (106). A connecting flange (107) is fixedly installed on the upper end of the reactor (101), and the reactor cover assembly (2) is fixedly installed on the upper end of the connecting flange (107). A discharge pipe (108) is fixedly installed on one side of the lower end of the reactor (101). A rotating disk (109) is fixedly installed in the middle of the interior of the reactor (101), and the lower end of the stirring assembly (4) is rotatably installed on the rotating disk (109).

4. The reactor for producing dioxolane according to claim 3, characterized in that: A connecting plate (204) is fixedly installed at the lower end of the cover (201), and connecting bolts (205) are evenly fixedly installed on the connecting plate (204). The connecting plate (204) is fixedly installed on the connecting flange (107) by the connecting bolts (205). The cover (201) seals the upper end of the reactor (101). A sleeve (206) is fixedly installed at the lower end of the inside of the cover (201), and the upper end of the stirring assembly (4) extends into the inside of the sleeve (206).

5. The reactor for producing dioxolane according to claim 4, characterized in that: The exhaust pipe (203) is fixedly installed on the upper end of the cover (201) and above the sleeve (206). An extension pipe (207) is fixedly installed at the lower end of the feed pipe (202), and the extension pipe (207) extends to one side of the lower end of the sleeve (206). An auxiliary material pipe (208) is fixedly installed on one side of the upper end of the cover (201), and an inspection pipe (209) is fixedly installed on the other side of the upper end of the cover (201). A sealing cap (2010) is fixedly installed at the upper end of the inspection pipe (209).

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