A polycarboxylic acid water reducing agent stirring kettle

Abstract

The utility model discloses a kind of polycarboxylate water reducing agent stirring kettle, including kettle body, rotating shaft and rotary drive mechanism, kettle body is equipped with feed inlet, kettle body bottom is equipped with discharge port, rotating shaft is rotatably arranged in kettle body, rotating shaft is equipped with the stirring member for stirring material, rotary drive mechanism is arranged on kettle body for driving rotating shaft rotates around its own axis;Kettle body is equipped with condenser outside, rotating shaft is equipped with cooling pipe inside, cooling pipe is connected with condenser, and can rotate relative to rotating shaft.The cooling pipe of polycarboxylate water reducing agent stirring kettle cooling pipe disclosed in the utility model no longer directly contacts with material, prevent material from impacting cooling pipe when being stirred, cooling pipe is not easy to be damaged, material is not easy to stick on cooling pipe;Further, cooling pipe is not arranged on kettle body, avoid the interference caused by cleaning work of cooling pipe to kettle inner wall, it is favorable to clean kettle inner wall.

Description

Technical Field

[0001] This utility model relates to the field of mixing tank technology, and in particular to a mixing tank for polycarboxylate superplasticizer. Background Technology

[0002] Polycarboxylate superplasticizers, as high-performance superplasticizers, are widely used in concrete engineering due to their excellent dispersibility, low dosage, and high slump retention. In the production process of polycarboxylate superplasticizers, a stirred tank is typically used for stirring and mixing materials. However, during the stirring process, the reaction between materials generates heat, and as the heat increases, it inhibits the reaction (the macromonomers used in the synthesis of polycarboxylate superplasticizers are mainly ethylene ethers, which have high polymerization activity and require low-temperature reaction). This results in lower production efficiency, and residues adhere to the inner wall and bottom of the stirred tank after the reaction. These residues are not only difficult to remove, affecting the quality of subsequent batches, but also lead to the loss and waste of effective products. To solve this problem, Chinese patent document CN221245163U discloses an anchor-type stirred reactor. In this technical solution, an arc-shaped cooling pipe is installed inside the reactor, which directly contacts the material for cooling. A scraper is fixed on the anchor wing, and the rotation of the rotating shaft drives the scraper to remove the residue from the inner wall of the reactor. However, this technical solution has the following problems:

[0003] Cooling is achieved by direct contact between the cooling pipe and the material. During the process of rotating and stirring the material, the material will continuously impact the cooling pipe, which can easily damage the cooling pipe. The material can also easily stick to the cooling pipe, increasing the subsequent cleaning work.

[0004] The cooling pipes are inserted into the reactor, which will affect the arrangement of the scraper on the inner wall of the reactor. The scraper cannot completely clean the inner wall of the reactor, which is not conducive to cleaning the inner wall of the reactor. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a polycarboxylate superplasticizer mixing tank in which the cooling pipe is not easily damaged or contaminated by materials during the mixing process, and which is conducive to cleaning the inner wall of the tank.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A polycarboxylate superplasticizer mixing tank includes a tank body, a rotating shaft, and a rotating drive mechanism. The tank body has a feed inlet and a discharge outlet at the bottom. The rotating shaft is rotatably mounted inside the tank body and has a stirring element for stirring materials. The rotating drive mechanism is mounted on the tank body to drive the rotating shaft to rotate around its own axis. A condenser is provided outside the tank body, and a cooling pipe is provided inside the rotating shaft. The cooling pipe is connected to the condenser and can rotate relative to the rotating shaft.

[0008] As a further improvement to the above technical solution: both ends of the cooling pipe are connected to the condenser to form a circulation loop.

[0009] As a further improvement to the above technical solution: the cooling pipe includes multiple cooling sections extending axially along the rotation axis, and both ends of the cooling pipe extend from the top of the rotation axis and are connected to the condenser through connecting pipes.

[0010] As a further improvement to the above technical solution: the middle part of the rotating shaft is provided with a hollow channel extending along the axis, the cooling pipe is provided in the hollow channel, the stirring element is provided with a nozzle communicating with the hollow channel, the outside of the vessel is provided with a fluid supply assembly, and the fluid supply assembly is rotatably connected to the top of the rotating shaft.

[0011] As a further improvement to the above technical solution: the fluid supply assembly includes a pipe and a pump body, the pump body is connected to the rotating shaft through the pipe, and the top end of the cooling pipe extends into the interior of the pipe and exits through the side wall of the pipe.

[0012] As a further improvement to the above technical solution: the rotary drive mechanism includes a drive motor, a gear and a gear ring, the drive motor is fixed to the outside of the vessel body, the gear is located on the output shaft of the drive motor, the gear ring is fixed to the rotating shaft, and the gear ring meshes with the gear.

[0013] As a further improvement to the above technical solution: the top of the rotating shaft extends out of the vessel body, and the gear ring is located at the end of the rotating shaft that extends out of the vessel body.

[0014] As a further improvement to the above technical solution: the vessel body includes a cover plate, a cylindrical upper vessel body and an inverted conical lower vessel body. The cover plate covers the upper vessel body, the feed inlet is located on the cover plate, the bottom of the upper vessel body is connected to the top of the lower vessel body, the discharge port is located at the bottom of the lower vessel body, the discharge port is connected to a discharge pipe, the discharge pipe is equipped with a discharge valve, and the rotating shaft passes through the cover plate and is rotatably connected to the cover plate.

[0015] As a further improvement to the above technical solution: the polycarboxylate superplasticizer mixing tank also includes a wall scraping mechanism, which is used to scrape off the residues adhering to the inner wall of the tank.

[0016] As a further improvement to the above technical solution: the wall scraping mechanism includes a first scraper, a second scraper and a lifting drive component. The first scraper is disposed on the upper vessel body and slides in cooperation with the inner wall of the upper vessel body. The lifting drive component is disposed on the cover plate and connected to the first scraper. The second scraper is disposed on the rotating shaft and slides in cooperation with the inner wall of the lower vessel body.

[0017] Compared with the prior art, the advantages of this utility model are as follows: The polycarboxylate superplasticizer mixing tank disclosed in this utility model has a condenser outside the tank body and a cooling pipe inside the rotating shaft. The cooling pipe is connected to the condenser and can rotate relative to the rotating shaft. When the rotating shaft rotates, it drives the stirring element to stir the material. The material reacts and the temperature rises. The temperature of the material is conducted to the rotating shaft, which then conducts heat to the cooling pipe. The refrigerant in the cooling pipe carries the heat to the condenser for discharge, thereby suppressing the temperature rise inside the tank body and ensuring the production efficiency of the polycarboxylate superplasticizer. At the same time, since the cooling pipe is no longer in direct contact with the material, it prevents the material from impacting the cooling pipe during stirring, making the cooling pipe less prone to damage and preventing material from adhering to the cooling pipe. Furthermore, since the cooling pipe is not located on the tank body, it avoids interfering with the cleaning of the inner wall of the tank body, which is beneficial for cleaning the inner wall of the tank body. Attached Figure Description

[0018] Figure 1 This is a front view structural schematic diagram of the stirred tank of the polycarboxylate superplasticizer of this utility model.

[0019] Figure 2 This is a cross-sectional structural schematic diagram of the stirred tank of the polycarboxylate superplasticizer of this utility model.

[0020] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0021] The labels in the diagram represent:

[0022] 1. Vessel body; 101. Inlet; 102. Outlet; 11. Cover plate; 12. Upper vessel body; 121. Support leg; 13. Lower vessel body; 131. Outlet pipe; 132. Outlet valve; 2. Rotating shaft; 21. Stirring component; 211. Nozzle; 3. Rotary drive mechanism; 31. Drive motor; 32. Gear; 33. Gear ring; 4. Cooling pipe; 41. Cooling section; 42. Connecting pipe; 5. Condenser; 6. Fluid supply assembly; 61. Pipeline; 62. Pump body; 7. Scraping mechanism; 71. First scraper; 72. Second scraper; 73. Lifting drive component; 74. Connecting rod; 8. Mounting platform. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Figures 1 to 3 This invention illustrates an embodiment of a polycarboxylate superplasticizer mixing tank. The polycarboxylate superplasticizer mixing tank of this embodiment includes a tank body 1, a rotating shaft 2, and a rotating drive mechanism 3. The tank body 1 has a feed inlet 101 and a discharge outlet 102 at its bottom. The rotating shaft 2 is rotatably disposed within the tank body 1 and has a stirring element 21 for stirring materials. The rotating drive mechanism 3 is disposed on the tank body 1 to drive the rotating shaft 2 to rotate around its own axis. A condenser 5 is disposed outside the tank body 1, and a cooling pipe 4 is disposed inside the rotating shaft 2. The cooling pipe 4 is connected to the condenser 5 and can rotate relative to the rotating shaft 2.

[0027] This polycarboxylate superplasticizer mixing vessel has a condenser 5 outside the vessel body 1 and a cooling pipe 4 inside the rotating shaft 2. The cooling pipe 4 is connected to the condenser 5 and can rotate relative to the rotating shaft 2. When the rotating shaft 2 rotates, it drives the stirring element 21 to stir the material. The material reacts and the temperature rises. The temperature of the material is conducted to the rotating shaft 2, which in turn conducts heat to the cooling pipe 4. The refrigerant in the cooling pipe 4 carries the heat to the condenser 5 for discharge, thereby suppressing the temperature rise inside the vessel body 1 and ensuring the production efficiency of the polycarboxylate superplasticizer. At the same time, since the cooling pipe 4 is located inside the rotating shaft 2, it is isolated from the material by the rotating shaft 2. This prevents the material from impacting the cooling pipe 4 during stirring, making the cooling pipe 4 less prone to damage and the material less likely to adhere to it, reducing the subsequent cleaning work required for the cooling pipe 4. Furthermore, since the cooling pipe 4 is not located on the vessel body 1, it avoids interfering with the cleaning of the inner wall of the vessel body 1, which is beneficial for cleaning the inner wall of the vessel body 1.

[0028] The method of using the polycarboxylate superplasticizer mixing tank is as follows: First, open the feed inlet 101 of the tank body 1 (the feed inlet 101 can be equipped with an opening and closing door for opening and closing the feed inlet 101, not shown in the attached diagram), and close the discharge port 102. Add the raw material through the feed inlet 101 of the tank body 1. Then, start the rotary drive mechanism 3 to drive the rotary shaft 2 to rotate and stir the material, and start the condenser 5 to remove the internal heat from the tank body 1, suppressing the rise in internal temperature. After the reaction is complete, close the rotary drive mechanism 3 and the condenser 5, open the discharge port 102, and release the polycarboxylate superplasticizer obtained from the reaction. It should be noted that this polycarboxylate superplasticizer mixing tank can also be used for stirring other products.

[0029] Further, see Figures 1 to 3 In this embodiment, both ends of the cooling pipe 4 are connected to the condenser 5 to form a circulation loop. The cooling pipe 4 includes multiple cooling sections 41 extending axially along the rotating shaft 2. Both ends of the cooling pipe 4 extend from the top of the rotating shaft 2 and are connected to the condenser 5 through connecting pipes 42. The multiple cooling sections 41 increase the heat absorption area of ​​the cooling pipe 4 and improve the heat dissipation effect. Of course, in other embodiments, the cooling pipe 4 can also be arranged in other ways within the rotating shaft 2, such as spiral extension, S-shaped extension, etc., depending on the actual cooling requirements.

[0030] Further, see Figure 1 and Figure 2In this embodiment, a hollow channel extending along the axis is provided in the middle of the rotating shaft 2, and the cooling pipe 4 is located inside the hollow channel. A nozzle 211 communicating with the hollow channel is provided on the stirring element 21. A fluid supply assembly 6 is provided outside the vessel body 1, and the fluid supply assembly 6 is rotatably connected to the top of the rotating shaft 2. After the polycarboxylate superplasticizer generated by the reaction is discharged from the outlet 102, fluid can be supplied to the interior of the rotating shaft 2 through the fluid supply assembly 6. The fluid is sprayed out through the nozzle 211, which can clean the inner wall of the vessel body 1. The nozzle 211 can rotate with the rotating shaft 2, providing a wide cleaning range. Preferably, a connecting channel is provided inside the stirring element 21, and the nozzle 211 communicates with the hollow channel through the connecting channel, avoiding the need for a connecting pipe outside the stirring element 21 to communicate with the hollow channel.

[0031] Further, see Figures 1 to 3 In this embodiment, the fluid supply assembly 6 includes a pipe 61 and a pump body 62. The pump body 62 is connected to the rotating shaft 2 through the pipe 61. The top end of the cooling pipe 4 extends into the pipe 61 and exits through the side wall of the pipe 61. Specifically, the pipe 61 is rotatably connected to the top end of the rotating shaft 2 through a rotary joint (not shown in the attached figure). The pump body 62 can be a water pump for pumping water, which has a good cleaning effect; the pump body 62 can also be an air pump for pumping air. On the one hand, the air can be pumped to clean the inner wall of the vessel 1. On the other hand, when stirring materials, air can be pumped into the rotating shaft 2 to prevent materials from entering the rotating shaft 2 through the nozzle 211 and flowing back to the pump body 62, which helps to avoid material contamination of the pipe 61 and the pump body 62. Of course, in other embodiments, to prevent materials from entering the rotating shaft 2 through the nozzle 211 and flowing back to the pump body 62, a single-phase valve can be embedded in the nozzle 211; the pump body 62 can also be an integrated pump that combines water pumping and air pumping functions, pumping air when stirring materials and pumping water when cleaning the inner wall of the vessel 1. Of course, in other embodiments, two pump bodies 62 can also be used, namely a water pump with water pumping function and an air pump with air pumping function. The water pump and the air pump are respectively connected to the pipe 61, and an air inlet valve is set on the air inlet pipe of the water pump and the air pump respectively. The same technical solution can achieve the function of pumping air into the rotating shaft 2 when stirring materials and pumping water into the rotating shaft 2 when cleaning the inner wall of the vessel 1.

[0032] As a preferred embodiment, see Figure 2 and Figure 3The stirring element 21 is a stirring rod, the end of which is mounted on the rotating shaft 2. Multiple stirring rods are arranged at intervals along the length of the rotating shaft 2. Multiple nozzles 211 are spaced along the length of each stirring rod, which improves the efficiency of stirring materials and enhances the rinsing effect on the inner wall of the vessel 1. Furthermore, the multiple stirring rods are arranged in a spiral pattern at uniform intervals along the length of the rotating shaft 2, which helps improve the uniformity of the stirred materials. Multiple nozzles 211 are spaced along the upper and lower sides of each stirring rod. Some nozzles 211 are used to rinse the inner wall of the vessel 1, some are used to rinse adjacent stirring rods, and some are used to rinse the rotating shaft 2, further reducing residues remaining inside the vessel 1. Preferably, the rotating shaft 2 is vertically positioned, and the stirring rods are perpendicular to the rotating shaft 2.

[0033] Further, see Figure 1 and Figure 2 In this embodiment, the rotary drive mechanism 3 includes a drive motor 31, a gear 32, and a gear ring 33. The drive motor 31 is fixed outside the vessel body 1, the gear 32 is mounted on the output shaft of the drive motor 31, and the gear ring 33 is fixed on the rotating shaft 2, meshing with the gear 32. The drive motor 31 drives the gear 32 to rotate, which in turn drives the gear ring 33 meshing with the gear 32 to rotate, thereby driving the rotating shaft 2 to rotate. The structure is simple and reliable. Of course, in other embodiments, a chain, belt, or other transmission method can also be used for rotational transmission, which will not be described in detail here.

[0034] Further, see Figure 1 and Figure 2 In this embodiment, the top of the rotating shaft 2 extends outside the vessel body 1, and the gear ring 33 is located at the end of the rotating shaft 2 that extends outside the vessel body 1, which facilitates the connection between the drive motor 31, the gear 32 and the gear ring 33.

[0035] Further, see Figure 1 and Figure 2 In this embodiment, the vessel body 1 includes a cover plate 11, a cylindrical upper vessel body 12, and an inverted conical lower vessel body 13. The cover plate 11 covers the upper vessel body 12, and the inlet 101 is located on the cover plate 11. The bottom of the upper vessel body 12 is connected to the top of the lower vessel body 13. The outlet 102 is located at the bottom of the lower vessel body 13. The outlet 102 is connected to the outlet pipe 131, and the outlet pipe 131 is equipped with an outlet valve 132, which facilitates the natural discharge of polycarboxylate superplasticizer under gravity. Of course, the fluid sprayed from the nozzle 211 can also be released from the outlet valve 132. The outlet 102 is connected to the outlet pipe 131, and the discharge rate of polycarboxylate superplasticizer can be controlled by controlling the opening and closing of the outlet valve 132. The rotating shaft 2 passes through the cover plate 11 and is rotatably connected to the cover plate 11, such as the rotating shaft 2 and the cover plate 11 being connected by a bearing. Preferably, the center lines of the rotating shaft 2, the upper vessel 12, and the lower vessel 13 are collinear, which is beneficial for uniformly stirring the materials.

[0036] Further, see Figure 1 and Figure 2 In this embodiment, the polycarboxylate superplasticizer mixing tank also includes a wall scraping mechanism 7, which is used to scrape off residues adhering to the inner wall of the tank body 1. Specifically, the wall scraping mechanism 7 includes a first scraper 71, a second scraper 72, and a lifting drive 73. The first scraper 71 is disposed on the upper tank body 12 and slides in cooperation with the inner wall of the upper tank body 12. The lifting drive 73 is disposed on the cover plate 11 and connected to the first scraper 71. The second scraper 72 is disposed on the rotating shaft 2 and slides in cooperation with the inner wall of the lower tank body 13. More specifically, the second scraper 72 is connected to the rotating shaft 2 via a connecting rod 74. The lifting drive 73 lifts and moves the first scraper 71 to scrape the inner wall of the upper vessel 12, removing residual products. When the rotating shaft 2 rotates, the second scraper 72 also scrapes the inner wall of the lower vessel 13 circumferentially, removing residues. These scraped-off residues are discharged through the discharge port 102, which helps avoid product waste. Furthermore, the cooling pipe 4 does not affect the arrangement of the first and second scrapers 71 and 72, ensuring the cleaning effect of the wall scraping mechanism 7. After product collection, the pump 62 is started to rinse the inner wall of the vessel 1 through the nozzle 211. Because there are fewer deposits on the inner wall of the vessel 1, the rinsing efficiency is higher, resulting in a cleaner wash and preventing product deposits from forming on the inner wall of the vessel 1.

[0037] Further, see Figure 1 and Figure 2 In this embodiment, the lifting drive component 73 is a long rod cylinder, which is fixed on the cover plate 11. The length direction of the lifting drive component 73 is parallel to the axial direction of the vessel body 1, and the piston of the lifting drive component 73 is connected to the first scraper 71. Of course, in other embodiments, the lifting drive component 73 can also be a lead screw, hydraulic cylinder, or electric cylinder, etc.

[0038] Further, see Figure 1 and Figure 2 In this embodiment, multiple lifting drive components 73 are provided. The two sides of the first scraper 71 are connected to the lifting drive component 73. When the first scraper 71 lifts and lowers, it scrapes the inner wall of the upper vessel 12 more stably and is more reliable in use. Preferably, the first scraper 71 is annular and coincides with the center line of the upper vessel 12.

[0039] Further, see Figure 1 and Figure 2 In this embodiment, the outer surface of the vessel body 1 is provided with an installation platform 8 for installing the pump body 62, which has good integration.

[0040] Further, see Figure 1 and Figure 2In this embodiment, the bottom of the vessel body 1 is provided with multiple support legs 121 at intervals along its circumference for supporting the vessel body 1.

[0041] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A polycarboxylate superplasticizer mixing tank, comprising a tank body (1), a rotating shaft (2), and a rotating drive mechanism (3), wherein the tank body (1) is provided with a feed inlet (101) and a discharge outlet (102) is provided at the bottom of the tank body (1), the rotating shaft (2) is rotatably disposed within the tank body (1), and the rotating shaft (2) is provided with a stirring element (21) for stirring materials, and the rotating drive mechanism (3) is disposed on the tank body (1) for driving the rotating shaft (2) to rotate around its own axis; characterized in that: The vessel body (1) is provided with a condenser (5) outside, and a cooling pipe (4) is provided inside the rotating shaft (2). The cooling pipe (4) is connected to the condenser (5) and can rotate relative to the rotating shaft (2).

2. The polycarboxylate superplasticizer stirred tank according to claim 1, characterized in that: Both ends of the cooling pipe (4) are connected to the condenser (5) to form a circulation loop.

3. The polycarboxylate superplasticizer stirred tank according to claim 2, characterized in that: The cooling pipe (4) includes multiple cooling sections (41) extending axially along the rotating shaft (2). Both ends of the cooling pipe (4) extend from the top of the rotating shaft (2) and are connected to the condenser (5) through a connecting pipe (42).

4. The polycarboxylate superplasticizer stirred tank according to claim 1, characterized in that: The rotating shaft (2) has a hollow channel extending along the axis in the middle. The cooling pipe (4) is located in the hollow channel. The stirring component (21) has a nozzle (211) communicating with the hollow channel. The vessel body (1) has a fluid supply component (6) outside. The fluid supply component (6) is rotatably connected to the top of the rotating shaft (2).

5. The polycarboxylate superplasticizer mixing tank according to claim 4, characterized in that: The fluid supply assembly (6) includes a pipe (61) and a pump body (62), the pump body (62) being connected to the rotating shaft (2) via the pipe (61), and the top end of the cooling pipe (4) extending into the pipe (61) and exiting through the side wall of the pipe (61).

6. The polycarboxylate superplasticizer stirred tank according to any one of claims 1 to 5, characterized in that: The rotary drive mechanism (3) includes a drive motor (31), a gear (32) and a gear ring (33). The drive motor (31) is fixed outside the vessel body (1). The gear (32) is located on the output shaft of the drive motor (31). The gear ring (33) is fixed on the rotating shaft (2). The gear ring (33) meshes with the gear (32).

7. The polycarboxylate superplasticizer stirred tank according to claim 6, characterized in that: The top of the rotating shaft (2) extends outside the vessel body (1), and the gear ring (33) is located at the end of the rotating shaft (2) that extends outside the vessel body (1).

8. The polycarboxylate superplasticizer stirred tank according to any one of claims 1 to 5, characterized in that: The vessel body (1) includes a cover plate (11), a cylindrical upper vessel body (12), and an inverted conical lower vessel body (13). The cover plate (11) covers the upper vessel body (12), the feed inlet (101) is located on the cover plate (11), the bottom of the upper vessel body (12) is connected to the top of the lower vessel body (13), the discharge port (102) is located at the bottom of the lower vessel body (13), the discharge port (102) is connected to the discharge pipe (131), the discharge pipe (131) is provided with a discharge valve (132), and the rotating shaft (2) passes through the cover plate (11) and is rotatably connected to the cover plate (11).

9. The polycarboxylate superplasticizer stirred tank according to claim 8, characterized in that: The polycarboxylate superplasticizer mixing tank also includes a wall scraping mechanism (7), which is used to scrape off the residues adhering to the inner wall of the tank body (1).

10. The polycarboxylate superplasticizer mixing tank according to claim 9, characterized in that: The scraping mechanism (7) includes a first scraper (71), a second scraper (72) and a lifting drive (73). The first scraper (71) is disposed on the upper vessel body (12) and slides in cooperation with the inner wall of the upper vessel body (12). The lifting drive (73) is disposed on the cover plate (11) and connected to the first scraper (71). The second scraper (72) is disposed on the rotating shaft (2) and slides in cooperation with the inner wall of the lower vessel body (13).

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