Solid-liquid uniform mixing kettle capable of preventing deposition

Abstract

The embodiment of the utility model provides an anti-deposition solid-liquid uniform mixing kettle which comprises a kettle body, a filter screen and a stirring assembly, and the filter screen is arranged in the kettle body; the stirring assembly comprises a driving device, a rotating shaft, a first stirring device and a second stirring device, the driving device is used for driving the rotating shaft to rotate, and the first stirring device and the second stirring device are both connected with the rotating shaft; the first stirring device is used for stirring a solution in the kettle body and is positioned above the filter screen, and the second stirring device is positioned at the bottom in the kettle body and is positioned below the filter screen. The solution in the mixing kettle is stirred by the first stirring device, so that the composition of the solution in the kettle is uniform; and the solution in the kettle bottom area below the filter screen is stirred by the second stirring device, so that solid materials which settle to the kettle bottom through the filter screen are prevented from being gathered, and the solution in the kettle bottom area and the solution in the whole kettle form a non-uniform or non-homogeneous solution.

Description

Technical Field

[0001] The present application relates to the technical field of stirring containers, and in particular to a solid-liquid homogenizing kettle for preventing sedimentation. Background Art

[0002] In the process of synthesizing chemical additives, solid powder needs to react with molten liquid. For example, in the dry production process of materials such as calcium stearate and zinc stearate, metal oxides or their hydroxides are directly added to the reactor to react with the molten stearic acid for neutralization. The solid materials of metal oxides or their hydroxides added to the reactor are quickly mixed with the liquid stearic acid in the reactor under the action of the built-in agitator in the reactor, and a chemical reaction occurs to obtain products such as calcium stearate and zinc stearate.

[0003] However, mechanical impurities may be introduced into the existing reactor during the process of adding materials, and the mechanical parts of the built-in components of the reactor may fall off during the reaction; if a debris filter is set in the reactor, the filter will separate the reactor into two areas. In the existing reactor, only one of the areas can be stirred, and the other area separated by the debris filter will become a local "dead zone", resulting in material deposition; in addition, if solid materials are added to the reactor, some of the solid materials will sink to the bottom area of ​​the reactor through the debris filter, resulting in prolonged reaction operation time. Utility Model Content

[0004] The purpose of the present application is to provide a solid-liquid homogenizing kettle for preventing sedimentation.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] The embodiment of the present application provides a solid-liquid homogenizing kettle for preventing deposition, comprising a kettle body, a filter screen and a stirring assembly, wherein the filter screen is arranged in the kettle body;

[0007] The stirring assembly includes a driving device, a rotating shaft, a first stirring device and a second stirring device. The driving device is used to drive the rotating shaft to rotate. The first stirring device and the second stirring device are both connected to the rotating shaft. The first stirring device is used to stir the solution in the kettle body and is located above the filter screen. The second stirring device is located at the bottom of the kettle body and below the filter screen.

[0008] As an implementation manner, the kettle body is provided with at least one material inlet and outlet, and the material inlet and outlet is used for adding or discharging materials.

[0009] As an implementation manner, a bottom valve is provided on the bottom surface of the kettle body, and the bottom valve is connected to a valve handle and a discharge port.

[0010] As an implementation manner, the bottom surface of the kettle body is a curved surface structure, and the bottom valve is flush with the lowest point of the curved surface structure.

[0011] As an implementation manner, a first sealing member is provided at the connection between the valve handle and the bottom valve.

[0012] As an implementation manner, a first support member is fixed inside the kettle body, and the rotating shaft is rotatably connected to the first support member; a second support member is fixed outside the kettle body, and the second support member is fixedly connected to the driving device.

[0013] As an implementation mode, a second sealing member is provided at the connection between the rotating shaft and the kettle body.

[0014] As an implementation mode, the first support member is disposed in the kettle body through support ribs, and the filter screen is disposed on the support ribs.

[0015] As an embodiment, the first stirring device includes at least one of a spiral ribbon stirring section, an anchor stirring section, a frame stirring section, a turbine stirring section, an axial flow stirring section, and a paddle stirring section.

[0016] As an implementation manner, the first stirring device is detachably connected to the rotating shaft, and the second stirring device is fixedly connected to the rotating shaft.

[0017] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0018] The present application provides a filter screen in the kettle body to filter out mechanical debris brought in during the production process or dropped during the reaction process, and two sets of stirring devices are provided in the solid-liquid mixing kettle equipped with the filter screen, and the two sets of stirring devices each bring different effects. The first stirring device is arranged above the debris filter screen, and is responsible for stirring the solution in the kettle to mix the solution in the kettle to achieve a uniform composition. The second stirring device is arranged below the filter screen, and mainly generates a downward axial thrust to make the solution in the kettle bottom area separated by the filter screen flow downward along the axial direction to form an up and down tumbling and circulating mixing flow field. When solid materials pass through the filter screen and settle to the bottom of the kettle, they will be dispersed and dissolved by the second stirring device, thereby realizing uniform mixing of the materials in the kettle without deposition, achieving the required product quality, and no need to add more raw materials or pre-discharge a certain amount of materials that have not reacted completely due to the deposition of solid materials at the bottom when discharging the product. Therefore, the optimized structure can not only ensure the safe and reliable operation of the equipment, but also reduce the reaction mixing time, simplify the discharging operation, and reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic cross-sectional structure diagram of the solid-liquid homogenizing kettle of the present application;

[0021] Figure 2 yes Figure 1 A is a schematic diagram of the enlarged structure of the middle part;

[0022] Figure 3 It is a partial structural top view of the filter screen and the first support member of the present application.

[0023] In the figure: 1. kettle body; 2. filter screen; 3. driving device; 4. rotating shaft; 5. first stirring device; 501. paddle stirring section; 502. anchor stirring section; 503. spiral belt stirring section; 6. second stirring device; 7. material inlet and outlet; 8. bottom valve; 9. valve handle; 10. discharge port; 11. first sealing member; 12. first supporting member; 13. second supporting member; 14. second sealing member; 15. supporting ribs. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0026] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0027] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0028] See also Figure 1 The embodiment of the present application proposes a solid-liquid homogeneous mixing kettle for preventing deposition. The solid-liquid homogeneous mixing kettle can not only block the debris from entering the reaction kettle, but also fully stir the materials in the bottom area of ​​the kettle, which is of great significance for improving production operations, saving production costs, and achieving uniform mixing of materials in the kettle without deposition.

[0029] The solid-liquid mixing kettle of the embodiment of the present application includes a kettle body 1, a filter screen 2 and a stirring assembly, wherein the filter screen 2 is arranged in the kettle body 1; the stirring assembly includes a driving device 3, a rotating shaft 4, a first stirring device 5 and a second stirring device 6, the driving device 3 is used to drive the rotating shaft 4 to rotate, the first stirring device 5 and the second stirring device 6 are both connected to the rotating shaft 4, the first stirring device 5 is used to stir the solution in the kettle body 1 and is located above the filter screen 2, and the second stirring device 6 is located at the bottom of the kettle body 1 and below the filter screen 2.

[0030] In the present application, a filter screen 2 is arranged in the kettle body 1, which is used to filter out mechanical debris brought in during the production process or dropped during the reaction process, and two groups of stirring devices are arranged in the solid-liquid mixing kettle equipped with the filter screen 2. The two groups of stirring devices each bring different effects. The first stirring device 5 is arranged above the debris filter screen 2, and is responsible for stirring the solution in the kettle to mix the solution in the kettle to achieve a uniform composition. The second stirring device 6 is arranged below the filter screen 2, and mainly generates a downward axial thrust, so that the solution in the bottom area of ​​the kettle separated by the filter screen 2 flows downward along the axial direction to form an up and down rolling and circulating mixing flow field. When solid materials pass through the filter screen 2 and settle to the bottom of the kettle, they will be dispersed and dissolved by the second stirring device 6, thereby realizing uniform mixing of the materials in the kettle without deposition, achieving the required product quality, and no need to add more raw materials or pre-discharge a certain amount of materials that are not completely reacted due to the deposition of solid materials at the bottom when discharging the product. Therefore, the optimized structure can not only ensure the safe and reliable operation of the equipment, but also reduce the reaction mixing time, simplify the discharging operation, and reduce the production cost.

[0031] It can be understood that the kettle body 1 is a container for holding the liquid to be mixed or the solid material to be dissolved. The material and manufacturing requirements of the kettle body 1 can be determined by those skilled in the art according to the material in the kettle and the production process. As an optional technical solution, the equipment material is 304 stainless steel. 304 stainless steel has good corrosion resistance and can maintain its stability in humid, acidic and alkaline environments, which is crucial for equipment involving chemical reactions and stirring processes.

[0032] The driving device 3 mentioned above can be a driving device known in the art, such as a motor.

[0033] As a further optional technical solution, the equipment material can be 2205 duplex stainless steel or Hastelloy alloy. 2205 duplex stainless steel and Hastelloy alloy have excellent corrosion resistance and are particularly suitable for extreme corrosive conditions such as strong acids, strong alkalis and organic solvents.

[0034] Among them, the filter screen 2 can filter out mechanical impurities brought in through the material inlet and outlet 7 and mechanical parts dropped during the production operation, so as to prevent the above-mentioned debris from blocking the discharge bottom valve 8 or damaging the subsequent process equipment. Optionally, the filter screen 2 is made of metal wire mesh, stainless steel, plastic or other materials. The mesh aperture needs to be smaller than the size of mechanical impurities that may be brought in by the material and the size of mechanical parts that may drop from the rotating parts in the kettle during the production operation. The metal wire mesh can be a single layer or multiple layers can be set to ensure that the material is clean after the debris is filtered out by the filter screen 2, and at the same time ensure the reliable operation of the discharge valve at the bottom of the solid-liquid mixing kettle, and ensure the safe operation of the subsequent material conveying equipment.

[0035] The solid-liquid mixing kettle can manually or automatically open the cover of the lid structure arranged above the kettle body 1 to add or discharge solid or liquid materials from above; the material inlet and outlet 7 can also be designed on the kettle body 1, and the material can be added or discharged by opening the material inlet and outlet 7. The specific feeding and discharging structure is not limited in this application.

[0036] In a specific embodiment, stearic acid and oxide or hydroxide powder are added to the solid-liquid homogenizing kettle, and a neutralization reaction occurs under solid-liquid suspension and stirring in the solid-liquid homogenizing kettle. The reaction materials liquid stearic acid and solid oxide or hydroxide powder are added through the material inlet and outlet 7. The solid-liquid homogenizing kettle drives the rotating shaft 4 to rotate through the driving device 3, and then the first stirring device 5 connected to the rotating shaft 4 stirs the reactant liquid stearic acid and solid oxide or hydroxide powder added to the kettle body 1, so that the liquid and solid materials are suspended, dispersed, uniformly mixed and fully reacted. The second stirring device 6 fixed on the rotating shaft 4 is driven by the rotating shaft 4 to stir the solution in the bottom area of ​​the kettle separated by the filter screen 2, and disperse the solid powder settled in the area through the filter screen 2, so as to avoid the local solid accumulation phenomenon in the bottom area of ​​the kettle separated by the filter screen 2 due to lack of stirring or inappropriate stirring method, so that the solution concentration in the area is inconsistent with the concentration composition of the solution in the upper part of the solid-liquid homogenizing kettle, resulting in problems such as prolonged reaction time, increased amount of solid reaction materials, and pre-discharge of bottom accumulation, so as to ensure that the quality of the discharged product meets the process requirements. Therefore, the overall structure of the solid-liquid mixing kettle of this embodiment can ensure that the materials in the kettle body 1 are evenly mixed and dispersed, shorten the reaction time, save the pre-discharging operation and reduce the product cost.

[0037] like Figure 1 As shown, in some embodiments, the kettle body 1 is provided with at least one material inlet and outlet 7, and the material inlet and outlet 7 is used for adding or discharging materials.

[0038] The provision of the material inlet and outlet 7 makes the operation of adding or discharging materials more convenient. The operator can directly add or discharge materials to the kettle body 1 through the material inlet and outlet 7 without frequently opening the entire cover body or other complicated operation steps.

[0039] Those skilled in the art can select appropriate positions and numbers of material inlets and outlets 7 according to different process requirements to adapt to different ways of adding or discharging materials, thereby improving the versatility of the solid-liquid homogenizing kettle.

[0040] like Figure 2 As shown, in some embodiments, a bottom valve 8 is provided on the bottom surface of the kettle body 1 , and the bottom valve 8 is connected to a valve handle 9 and a discharge port 10 .

[0041] The design of the bottom valve 8 enables precise control of the discharge process. The operator can control the opening and closing degree of the bottom valve 8 by adjusting the valve handle 9, thereby precisely controlling the flow rate and amount of the material, which helps to meet the requirements of specific reaction conditions.

[0042] Preferably, the bottom valve 8 adopts a downward-expanding discharge valve to ensure that there is no interference with the components inside the kettle during the discharge operation. The bottom valve 8 adopts a downward-expanding discharge valve, and the valve expands downward during the opening process, ensuring that the normal operation of other components in the kettle will not be damaged or interfered with during the discharge process.

[0043] like Figure 2-3 As shown, in some embodiments, the bottom surface of the kettle body 1 is a curved surface structure, and the bottom valve 8 is flush with the lowest point of the curved surface structure.

[0044] The bottom of the arc surface structure can prevent the material from forming an accumulation area at the bottom, and the material is unlikely to remain at the bottom during the emptying process, effectively avoiding the problem of material accumulation in dead corners; after the reaction is completed, complete emptying through the bottom valve 8 can reduce the residual reactants, avoid cross-contamination and mixing of the reaction materials, and reduce the impact on the next round of reaction.

[0045] like Figure 2 As shown, in some embodiments, a first sealing member 11 is provided at the connection between the valve handle 9 and the bottom valve 8 .

[0046] The first sealing member 11 is provided at the connection between the valve handle 9 and the bottom valve 8 to provide additional sealing protection, which helps to prevent material leakage during the operation of the valve handle 9, maintain the airtightness inside the reactor, and ensure the stability and safety of the reaction process.

[0047] like Figure 1 As shown, in some embodiments, a first support member 12 is fixed inside the kettle body 1, and the rotating shaft 4 is rotatably connected to the first support member 12; a second support member 13 is fixed outside the kettle body 1, and the second support member 13 is fixedly connected to the driving device 3.

[0048] The first support member 12 is arranged in the kettle body 1 to provide additional support, ensuring the stable rotation of the rotating shaft 4, reducing the vibration and swing of the rotating shaft 4 during operation, and improving the structural stability of the equipment; optionally, a bearing is used at the connection between the rotating shaft 4 and the first support member 12, and the bearing can reduce friction, provide support and guidance, and ensure the smooth rotation of the rotating shaft 4.

[0049] The fixed connection between the second support member 13 and the driving device 3 strengthens the structural stability of the entire system, can reduce vibration and swing during the stirring process, improve the reliability and safety of the equipment, and reduce the vibration of the solid-liquid mixing kettle during operation, thereby reducing the noise generated by the solid-liquid mixing kettle and improving the comfort of the working environment. Optionally, the second support member 13 and the driving device 3 are welded to form a firm connection.

[0050] like Figure 1 As shown, in some embodiments, a second sealing member 14 is provided at the connection between the rotating shaft 4 and the kettle body 1 .

[0051] The second sealing member 14 can prevent the medium in the kettle body 1 from leaking out from the rotating shaft 4, thereby reducing the waste of raw materials, improving production efficiency, and reducing environmental protection costs.

[0052] The first seal 11 and the second seal 14 can be of a packing seal structure type, or a mechanical seal type, etc. The packing seal structure type seal is highly flexible, suitable for shafts of different diameters and shapes, has relatively low requirements for the shaft, and is suitable for harsh conditions such as high temperature, high pressure, and corrosive media; the mechanical seal type seal has good sealing performance, has good adaptability to high-speed operation and high-precision equipment, does not produce packing particles, and is suitable for scenes with high requirements for medium purity.

[0053] like Figure 1 and Figure 3 As shown, in some embodiments, the first support member 12 is disposed in the kettle body 1 through support ribs 15, and the filter screen 2 is disposed on the support ribs 15. Those skilled in the art can adjust the number of support ribs 15 according to actual needs, such as using three or four.

[0054] The support ribs 15 can be an inclined vertical support method or a horizontal support structure; the inclined vertical support method can utilize the inclined structural form to help form a smoother fluid dynamic structure, reduce fluid resistance and turbulence, and make the fluid flow evenly; the horizontal support structure is relatively simple and easier to operate and maintain. During cleaning and maintenance, workers can more easily access the horizontal support structure.

[0055] like Figure 1 As shown, in some embodiments, the first stirring device 5 includes at least one of a spiral ribbon stirring section 503 , an anchor stirring section 502 , a frame stirring section, a turbine stirring section, an axial flow stirring section, and a paddle stirring section 501 .

[0056] like Figure 1 As shown, the arrows in the figure indicate the flow direction of the fluid, wherein the paddle-type stirring section 501 can make the fluid form radial flow, and at the same time, the edge of the paddle can produce a large shearing and dispersing effect on the fluid, so that the solid materials are suspended and mixed; the anchor-type stirring section 502 has a large stirring range, and the medium in the stirring area will not form a flow dead angle, and at the same time, the paddle-type stirring section 501 has a shearing and dispersing effect on the fluid; the spiral belt stirring section 503 can push the solution on the kettle wall to flow upward, and make the solution near the rotating shaft 4 flow downward, so that the solution in the kettle body 1 forms a convection circulation, driving the solid materials in the kettle body 1 to be evenly distributed; the combined agitator structure not only ensures the uniform distribution of the solid materials in the kettle, but also realizes the uniform suspension of the solid materials in the kettle.

[0057] The combination of the above-mentioned agitator structure utilizes the advantages of various stirring components, and can form an all-round, multi-level stirring effect in the kettle body 1, ensuring that the solid material is evenly dispersed and suspended in the liquid, which helps to improve production efficiency, reduce mixing time, reduce waste, and ensure the uniformity and quality of the final product.

[0058] The number of layers of the first stirring device 5 can be set according to the size of the kettle and the height of the solution in the kettle, such as single layer, double layer or multiple layers; the number of stirring blades in each layer of the first stirring device 5 can be one, two or more, the purpose is to make the fluid in the kettle body 1 form both radial flow and convection circulation, so as to achieve rapid and efficient mixing of the solution in the kettle body 1.

[0059] In some embodiments, the first stirring device 5 is detachably connected to the rotating shaft 4 , and the second stirring device 6 is fixedly connected to the rotating shaft 4 .

[0060] The first stirring device 5 is located at the upper part of the kettle body 1, and is responsible for stirring the solution to make it evenly mixed. Since different processes may require agitators of different types or shapes to complete different mixing tasks, the detachable connection design allows different types of first stirring devices 5 to be replaced when necessary, thereby improving the flexibility and versatility of the equipment.

[0061] The detachable connection between the first stirring device 5 and the rotating shaft 4 includes but is not limited to: a threaded connection, a quick-clip connection, a magnetic connection or a clamping device; the threaded connection can be connected and disassembled through the threads between the first stirring device 5 and the rotating shaft 4; the quick-clip connection usually includes a quickly operable crimping device that locks or releases the connection by pushing or rotating, and can quickly and conveniently achieve disassembly and connection.

[0062] The main task of the second stirring device 6 is to generate a downward axial thrust in the bottom area of ​​the kettle to form an up and down tumbling and circulating mixing flow field. In order to maintain the stability of this movement and ensure that the stirring device does not loosen during operation, a fixed connection can provide more stable performance.

[0063] Optionally, the second stirring device 6 and the rotating shaft 4 are reliably fixed by welding. Welding provides a strong connection, so that the second stirring device 6 and the rotating shaft 4 form a solid whole with high strength and stability.

[0064] Optionally, the second stirring device 6 is of a propulsion type, and a screw type or axial flow type structure may also be used. The screw type stirring device can make the fluid in the bottom area of ​​the kettle below the filter screen 2 tumble up and down with the rotation of the blade, thereby preventing the solid sedimentation materials passing through the debris filter screen 2 from gathering in the bottom area of ​​the kettle; the use of a propulsion type agitator structure can ensure that all solid materials leave the bottom of the kettle, avoiding the deposition of solid materials at the bottom of the kettle, thereby ensuring that the materials in the homogenous mixing reactor can be mixed and dispersed evenly, the reaction operation time is short, and no pre-discharge is required after the reaction is completed.

[0065] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A solid-liquid homogenizing kettle for preventing sedimentation, characterized in that: It comprises a kettle body, a filter screen and a stirring assembly, wherein the filter screen is arranged in the kettle body; The stirring assembly includes a driving device, a rotating shaft, a first stirring device and a second stirring device. The driving device is used to drive the rotating shaft to rotate. The first stirring device and the second stirring device are both connected to the rotating shaft. The first stirring device is used to stir the solution in the kettle body and is located above the filter screen. The second stirring device is located at the bottom of the kettle body and below the filter screen.

2. The solid-liquid homogenizing kettle for preventing deposition according to claim 1, characterized in that: The kettle body is provided with at least one material inlet and outlet, and the material inlet and outlet are used for adding or discharging materials.

3. The solid-liquid homogenizing kettle for preventing deposition according to claim 2, characterized in that: A bottom valve is arranged on the bottom surface of the kettle body, and the bottom valve is connected with a valve handle and a discharge port.

4. The solid-liquid homogenizing kettle for preventing deposition according to claim 3, characterized in that: The bottom surface of the kettle body is a curved surface structure, and the bottom valve is flush with the lowest point of the curved surface structure.

5. The solid-liquid homogenizing kettle for preventing deposition according to claim 3, characterized in that: A first sealing member is provided at the connection between the valve handle and the bottom valve.

6. The solid-liquid homogenizing kettle for preventing deposition according to claim 1, characterized in that: A first support member is fixed inside the kettle body, and the rotating shaft is rotatably connected to the first support member; a second support member is fixed outside the kettle body, and the second support member is fixedly connected to the driving device.

7. The solid-liquid homogenizing kettle for preventing deposition according to claim 6, characterized in that: A second sealing member is provided at the connection between the rotating shaft and the kettle body.

8. The solid-liquid homogenizing kettle for preventing deposition according to claim 6, characterized in that: The first support member is arranged in the kettle body through support ribs, and the filter screen is arranged on the support ribs.

9. The solid-liquid homogenizing kettle for preventing deposition according to any one of claims 1 to 8, characterized in that: The first stirring device includes at least one of a spiral ribbon stirring portion, an anchor stirring portion, a frame stirring portion, a turbine stirring portion, an axial flow stirring portion, and a paddle stirring portion.

10. The solid-liquid homogenizing kettle for preventing sedimentation according to claim 9, characterized in that: The first stirring device is detachably connected to the rotating shaft, and the second stirring device is fixedly connected to the rotating shaft.

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