A mixing device for resin concrete electrolytic cell casting raw materials

Abstract

The application discloses a kind of resin concrete electrolytic cell pouring raw material's stirring device, including conveying component and stirring component, the conveying component is used to pour raw material and is conveyed to stirring component inside and is stirred;The stirring component includes stirring barrel and the stirring mechanism for stirring the material in stirring barrel, the cleaning component for the material adhered to the inner wall of stirring barrel is also provided in stirring barrel, the cleaning component includes driving mechanism, mounting ring and scraper ring, the driving mechanism is installed in stirring barrel, the mounting ring is drivingly connected with driving mechanism, the scraper ring is detachably mounted on mounting ring, the outer circle wall of scraper ring is in abutment with the inner wall of stirring barrel, and the scraper ring is made of flexible wear-resistant rubber material.The application can effectively and continuously remove the adhered material on the inner wall of stirring barrel, and facilitate quick maintenance and replacement of the wall scraping component, thereby ensuring the stability of the mixing quality of pouring raw material and the production efficiency of the device.

Description

Technical Field

[0001] This invention relates to the field of mixing device technology, and specifically to a mixing device for casting raw materials in a resin concrete electrolytic cell. Background Technology

[0002] Resin-concrete electrolytic cells have been widely used in non-ferrous metal hydrometallurgy and other fields due to their excellent chemical corrosion resistance and mechanical strength. During the casting process of the electrolytic cell, resin, curing agent, and fillers of various grades (such as quartz sand and quartz powder) need to be mixed in proportion and thoroughly stirred to form a casting raw material with suitable fluidity. The uniformity of this casting raw material directly affects the density, strength, and corrosion resistance of the final product.

[0003] Currently, equipment used for mixing such casting raw materials mostly adopts a vertical or horizontal mixing tank structure, relying on rotating mixing blades to apply shearing and tumbling effects to the materials. However, resin-based mixtures generally have high viscosity, and during the mixing process, they easily adhere to and clump onto the inner wall of the mixing tank. This brings at least two problems: first, the material adhering to the wall cannot participate in sufficient mixing and circulation, causing the formula ratio to deviate from the design value, affecting the stability of the casting raw material quality; second, the adhered layer gradually thickens and hardens over time, not only reducing the effective working volume of the mixing tank, but also making cleaning extremely difficult. If manual entry into the tank is used for scraping, the labor intensity is high, the working environment is poor, and there are safety hazards; if high-pressure water or solvent washing is used, impurities will be introduced or a large amount of waste liquid will be generated, resulting in high treatment costs.

[0004] To address the issue of wall adhesion, existing technologies include designs that incorporate wall-scraping structures within the mixing device. However, common wall-scraping structures often employ fixed or welded-in scrapers or blades, which are prone to wear at the scraping ends after prolonged use, leading to gaps between the scraper and the tank wall and a significant decrease in scraping effectiveness. This often necessitates replacing the entire wall-scraping assembly or performing complex welding repairs, resulting in time-consuming and costly maintenance, severely impacting the continuous operation efficiency of the mixing device. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a stirring device for casting raw materials in a resin concrete electrolytic cell, which can effectively and continuously remove the adhering material on the inner wall of the stirring tank, while facilitating the quick maintenance and replacement of the wall scraping components, thereby ensuring the stability of the mixing quality of the casting raw materials and the production efficiency of the device.

[0006] The technical solution provided by the present invention to solve the above problems is: a stirring device for casting raw materials in a resin concrete electrolytic cell, comprising a conveying component and a stirring component, wherein the conveying component is used to convey the casting raw materials into the stirring component for stirring; The mixing assembly includes a mixing tank and a mixing mechanism for mixing materials inside the mixing tank. The mixing tank is also equipped with a cleaning assembly for scraping off materials adhering to the inner wall of the mixing tank. The cleaning assembly includes a drive mechanism, a mounting ring, and a scraper ring. The drive mechanism is installed inside the mixing tank, and the mounting ring is connected to the drive mechanism for transmission. The scraper ring is detachably installed on the mounting ring, and the outer ring wall of the scraper ring abuts against the inner wall of the mixing tank. The scraper ring is made of flexible and wear-resistant rubber material.

[0007] Preferably, the inner ring of the scraper ring is provided with a mounting groove, and the outer ring of the mounting ring is provided with a fixing ring that mates with the mounting groove.

[0008] Preferably, the scraper ring is further provided with a positioning component for positioning the scraper ring.

[0009] Preferably, the positioning assembly includes a compression ring, a connecting rod, and a positioning plate. The compression ring is integrally formed in a trumpet shape at both ends of the scraper ring. The compression ring is provided with a plurality of hinge seats one. The positioning plate is movably mounted on the scraper ring. The positioning plate is provided with hinge seats two. One end of the connecting rod is hinged to hinge seat one, and the other end is hinged to hinge seat two. The mounting ring is provided with a plurality of positioning grooves at positions corresponding to the positioning plate.

[0010] Preferably, the mounting ring is provided with multiple U-shaped reinforcing plates, the reinforcing plates are provided with guide grooves on both sides, and the positioning plates are provided with guide protrusions on both sides that cooperate with the guide grooves.

[0011] Preferably, the driving mechanism includes a drive motor and a lead screw. The drive motor is mounted on the upper end of the mixing tank and is connected to the lead screw via a transmission. The mounting ring is provided with a threaded hole that engages with the lead screw thread.

[0012] Preferably, the stirring assembly includes a stirring motor, a stirring shaft, and several stirring paddles. The stirring motor is installed at the upper end of the stirring tank, the stirring shaft is connected to the stirring motor in a driving connection, and the several stirring paddles are installed on the stirring shaft.

[0013] Preferably, the conveying assembly includes a conveying pump and a conveying pipe, with one end of the conveying pipe connected to the conveying pump and the other end connected to the inside of the mixing tank.

[0014] Compared with existing technologies, the advantages of this invention are as follows: This invention achieves active and dynamic scraping of materials adhering to the inner wall of the mixing tank by setting up a cleaning assembly consisting of a drive mechanism, a mounting ring, and a scraper ring. During the mixing operation, the drive mechanism drives the scraper ring to continuously move against the tank wall, promptly peeling the sticky material from the wall surface and returning it to the mixing area. This fundamentally avoids the material hardening due to prolonged adhesion, effectively ensuring the accuracy of the material ratio and the uniformity of mixing within a batch, thereby ensuring the stability of the quality of the electrolytic cell castings. Simultaneously, continuous scraping maintains the effective working volume of the mixing tank, eliminating the need for frequent shutdowns for cleaning due to material accumulation, significantly improving the efficiency of continuous production. Secondly, the scraper ring and mounting ring are designed with a detachable connection. When the scraper ring wears down, causing a decrease in scraping effectiveness, operators do not need to spend a lot of time on complex disassembly, cutting, and welding repair work as with traditional welded integrated scrapers. They only need to quickly disassemble the worn old scraper ring and replace it with a new one. This modular replacement method greatly shortens equipment maintenance downtime, reduces maintenance difficulty and labor costs, enables the equipment to quickly restore its excellent wall scraping performance, and ensures production continuity. Attached Figure Description

[0015] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a cross-sectional view of the stirring assembly of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a cross-sectional view of the scraping ring, extrusion ring, and positioning assembly of the present invention; Figure 5 This is a schematic diagram of the reinforcing plate of the present invention; Figure 6 This is a top view of the cleaning component of the present invention; Figure 7 yes Figure 6 Enlarged diagram of point B in the middle.

[0017] Attached diagram labels: 1. Conveying pump, 2. Conveying pipe, 3. Mixing tank, 4. Drive motor, 5. Lead screw, 6. Mixing shaft, 7. Mixing paddle, 8. Mixing motor, 9. Mounting ring, 10. Positioning plate, 11. Hinge seat two, 12. Connecting rod, 13. Hinge seat one, 14. Extrusion ring, 15. Scraper ring, 16. Reinforcing plate, 17. Guide groove, 18. Mounting groove, 19. Fixing ring. Detailed Implementation

[0018] The following will describe in detail the implementation of the present invention with reference to the accompanying drawings and embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0019] In the description of this invention, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. They should not be construed as limiting the specific protection scope of this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature, and in the description of this invention, "a number" means two or more, unless otherwise explicitly specified.

[0021] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0023] It should also be understood that the terminology used in this specification of embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the invention. As used in this specification of embodiments of the invention and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0024] Specific embodiments of the present invention are illustrated in the accompanying drawings. Referring to the drawings, a mixing device for casting raw materials in a resin concrete electrolytic cell mainly consists of a conveying assembly and a mixing assembly. The conveying assembly is used to continuously or intermittently convey various raw materials (such as resin, curing agent, aggregate, etc.) required for resin concrete casting into the mixing assembly for thorough mixing. The conveying assembly includes a conveying pump 1 and a conveying pipe 2. One end of the conveying pipe 2 is connected to the outlet of the conveying pump 1, and the other end is connected to the interior of the mixing tank 3, thereby reliably injecting the raw materials into the mixing tank 3. The conveying pump 1 can be a corrosion-resistant screw pump or a diaphragm pump to suit the characteristics of the resin material.

[0025] The mixing assembly includes a vertically arranged mixing tank 3 and a mixing mechanism for mixing the materials inside the mixing tank 3. The mixing tank 3 can be made of stainless steel or carbon steel with an anti-corrosion lining, and usually has a discharge port with a valve at the bottom to discharge the mixture after mixing. The mixing mechanism specifically includes a mixing motor 8, a mixing shaft 6, and several mixing paddles 7. The mixing motor 8 is installed at the upper end of the mixing tank 3, and its output end is connected to the mixing shaft 6, which extends vertically into the tank. Several mixing paddles 7 are fixedly installed on the mixing shaft 6 at axial intervals. The mixing paddles 7 can be paddle-type, anchor-type, or frame-type to meet the mixing requirements of the high viscosity of resin concrete.

[0026] In actual production, high-viscosity resin concrete raw materials easily adhere to the inner wall of the mixing tank 3, causing not only material waste but also affecting subsequent mixing efficiency and equipment cleaning. To solve this problem, a cleaning assembly for scraping off the material adhering to the inner wall is specially installed inside the mixing tank 3. This cleaning assembly includes a drive mechanism, a mounting ring 9, and a scraper ring 15.

[0027] The drive mechanism is installed inside the mixing tank 3 and is used to drive the mounting ring 9 to move up and down along the axial direction of the mixing tank 3. In this embodiment, the drive mechanism includes a drive motor 4 and a lead screw 5. The drive motor 4 is fixedly mounted on the upper end of the mixing tank 3, and its output shaft is connected to the vertically arranged lead screw 5. The two can be connected by a coupling or a reduction mechanism. The mounting ring 9 is a metal ring with a threaded hole on its body that mates with the lead screw 5. Thus, when the drive motor 4 drives the lead screw 5 to rotate, the mounting ring 9 can move up and down along the lead screw 5. For stable guidance, a guide rod can also be fixed inside the mixing tank 3, and a corresponding guide hole can be opened on the mounting ring 9. However, this is an optional optimization and does not affect the essence of this solution.

[0028] The scraper ring 15 serves as the scraping component that directly contacts the inner wall of the mixing tank 3. It is detachably mounted on the mounting ring 9 for easy replacement after wear. The outer ring of the scraper ring 15 is press-fitted against the inner wall of the mixing tank 3 to ensure effective scraping. Since resin concrete often contains hard aggregates, the scraper ring 15 needs to have good wear resistance and flexibility. Therefore, it is made of a flexible, wear-resistant friction rubber material, such as polyurethane rubber or nitrile rubber with added wear-resistant fillers, with a Shore hardness preferably between A70 and A90. This material effectively scrapes away materials without scratching the tank wall.

[0029] To achieve a reliable and detachable connection between the scraper ring 15 and the mounting ring 9, while ensuring that they do not loosen during scraping, this embodiment incorporates the following design: The inner ring of the scraper ring 15 is provided with a mounting groove 18, the cross-section of which can be rectangular, dovetail-shaped, or T-shaped; the outer ring of the mounting ring 9 is integrally provided with a fixing ring 19 that mates with the mounting groove 18. The cross-sectional shape of the fixing ring 19 is adapted to the mounting groove 18, forming a snap-fit ​​structure. During installation, simply align the mounting groove 18 of the scraper ring 15 with the fixing ring 19 and press it in to complete the initial circumferential and axial fixation.

[0030] As another important embodiment of the present invention, the scraper ring 15 is also provided with a positioning component for precise positioning and locking of the scraper ring 15. This positioning component automatically enhances the connection reliability between the scraper ring 15 and the mounting ring 9 during the scraping process, preventing the scraper ring 15 from accidentally loosening due to friction.

[0031] Specifically, the positioning assembly includes a compression ring 14, a connecting rod 12, and a positioning plate 10. The compression ring 14 is integrally formed in a trumpet shape at both ends of the scraper ring 15. The compression ring 14 has several hinge seats 13. The positioning plate 10 is movably mounted on the scraper ring 15 and has a second hinge seat 11. One end of the connecting rod 12 is hinged to the first hinge seat 13, and the other end is hinged to the second hinge seat 11. The mounting ring 9 has several positioning grooves corresponding to the positioning plate 10. Furthermore, the mounting ring 9 contains several U-shaped reinforcing plates 16. The reinforcing plates 16 have guide grooves 17 on both sides, and the positioning plate 10 has guide protrusions on both sides that cooperate with the guide grooves 17.

[0032] In another embodiment of the present invention, the driving mechanism includes a drive motor 4 and a lead screw 5. The drive motor 4 is mounted on the upper end of the mixing tank 3 and is connected to the lead screw 5 in a transmission manner. The mounting ring 9 is provided with a threaded hole that is threadedly engaged with the lead screw 5.

[0033] In the above scheme, firstly, the conveying component delivers the raw materials required for casting the resin concrete electrolytic cell into the mixing tank. The mixing mechanism is then activated to thoroughly mix the materials. During or after mixing, to prevent materials from adhering to the tank wall, the cleaning component is activated. The drive motor rotates the lead screw, causing the mounting ring to reciprocate up and down along the lead screw. At this time, the scraper ring, pre-fitted into the fixing ring of the outer ring of the mounting ring through the mounting groove of its inner ring, is placed entirely inside the mixing tank. Due to the elastic contact between the outer ring wall of the scraper ring and the inner wall of the mixing tank, the flared compression rings formed integrally at its upper and lower ends are subjected to radial compression from the tank wall, resulting in elastic contraction deformation towards the ring center. This contraction action pulls the connecting rod through the first hinge seat, and the connecting rod then pushes the positioning plate movably mounted on the scraper ring outward through the second hinge seat. The guide protrusions on both sides of the positioning plate slide along the guide groove of the reinforcing plate, ultimately allowing the end of the positioning plate to reliably embed into the corresponding positioning groove on the mounting ring, thereby automatically locking the scraper ring onto the mounting ring in the axial and radial directions. As the mounting ring rises and falls, the scraper ring moves close to the barrel wall, scraping the adhered material back into the barrel in real time. The trumpet-shaped extrusion rings at the top and bottom also guide the material downwards, preventing accumulation. The reinforcing plate enhances the rigidity of the mounting ring, and the guide structure ensures smooth operation of the positioning plate.

[0034] When the scraper ring needs replacement due to wear and tear from long-term use, simply remove the mounting ring along with the scraper ring from the mixing tank. Once detached from the tank wall, the reaction force acting on the compression ring disappears, and the compression ring recovers its deformation and expands back to its original position through its own rubber elasticity. This, in turn, pulls the positioning plate in the opposite direction via the connecting rod, causing the positioning plate to exit the positioning groove and releasing the lock on the scraper ring. At this point, the old scraper ring can be easily removed from the fixing ring and a new scraper ring can be replaced. When reinstalled in the mixing tank, the above process of automatic locking using the reaction force of the tank wall is repeated, thus completing the coordinated work of raw material mixing, automatic inner wall cleaning, and quick scraper ring replacement.

[0035] The above solution utilizes the interaction force between the inner wall of the mixing tank and the scraper ring, greatly simplifying the installation and removal process of the scraper ring. During installation, no external tools or complex locking operations are required. Simply place the mounting ring carrying the scraper ring into the mixing tank, and the scraper ring, under the reaction force of the tank wall, automatically and reliably locks itself axially and radially through the linkage of the compression ring, connecting rod, and positioning plate, significantly improving assembly efficiency. When a worn scraper ring needs to be replaced, the locking force automatically dissipates as the mounting ring is removed from the tank. The rubber elasticity of the compression ring causes the positioning plate to automatically reset and unlock, enabling quick removal and replacement of the scraper ring, significantly reducing equipment maintenance downtime and lowering the labor intensity of operators. Furthermore, the design of this cleaning component ensures continuous, efficient, and stable scraping. The flexible, wear-resistant rubber scraper ring maintains a tight fit with the tank wall, effectively scraping off adhering materials in real time, preventing material solidification and residue, improving raw material utilization, and ensuring the cleanliness of subsequent mixing. The integrated, trumpet-shaped extrusion ring at both ends not only guides the scraped material to fall smoothly, preventing it from piling up and overshooting the extrusion ring, but more importantly, it continuously withstands the pressure of the drum wall during operation. Through the connecting rod, it generates a continuous clamping force on the positioning plate, ensuring that the positioning plate remains firmly engaged in the positioning groove throughout the reciprocating scraping process. The cooperation between the reinforcing plate, guide groove, and guide protrusion enhances the rigidity of the mounting ring while providing precise guidance for the positioning plate's movement, ensuring the long-term reliability and smooth operation of the entire cleaning assembly, comprehensively improving the automation level and durability of the device. Furthermore, as the extrusion ring reciprocates with the mounting ring within the mixing drum, its trumpet-shaped elasticity effectively acts as a high-performance dynamic buffer and shock absorber. During high-speed operation of the mixing mechanism or when the scraper handles unevenly hard, sticky materials, the entire cleaning assembly is subjected to complex impacts and vibrations. If these impacts are directly transmitted to the rigidly connected positioning plate and mounting ring, they can easily cause hard collision wear on the contact surface between the positioning plate and the positioning groove, or even fatigue fracture. The extrusion ring, through its own elastic deformation, flexibly absorbs and dissipates the radial and axial impact forces received by the scraper ring. This significantly smooths the force transmitted to the connecting rod and positioning plate, effectively protecting the locking mechanism and greatly reducing the risk of loosening or failure under long-term alternating loads. Simultaneously, the extrusion ring creates a locally pressure-compensating sealed environment during operation. During cleaning, especially when handling highly fluid slurries, fine slurry particles inevitably seep into the interface between the scraper ring and the barrel wall. Conventional scrapers rely solely on interference fits for sealing and scraping, while the extrusion ring in this design exhibits an elastic deformation tendency towards the ring center after being compressed. This not only does not weaken the scraper but, because of its flared shape, forms a lip-like seal structure with the barrel wall, generating a dynamic wedge-shaped extrusion effect in the scraper ring's direction of movement.This effect pushes the slurry attempting to enter the back of the scraper ring forward and guides it to the center of the tank, thus unexpectedly forming a highly efficient self-sealing barrier in the core scraping area of ​​the scraper ring. This greatly reduces the possibility of the slurry passing over the scraper ring and contaminating the precision components such as the lead screw and drive mechanism at the top of the cleaning assembly.

[0036] The above description only illustrates the preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All modifications made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A mixing device for casting raw materials in a resin concrete electrolytic cell, characterized in that, It includes a conveying assembly and a mixing assembly, wherein the conveying assembly is used to convey the casting raw materials into the mixing assembly for mixing; The mixing assembly includes a mixing tank (3) and a mixing mechanism for mixing the materials inside the mixing tank (3). The mixing tank (3) is also provided with a cleaning assembly for scraping off the materials adhering to the inner wall of the mixing tank (3). The cleaning assembly includes a driving mechanism, a mounting ring (9) and a scraper ring (15). The driving mechanism is installed inside the mixing tank (3). The mounting ring (9) is connected to the driving mechanism. The scraper ring (15) is detachably installed on the mounting ring (9). The outer ring wall of the scraper ring (15) abuts against the inner wall of the mixing tank (3). The scraper ring (15) is made of flexible wear-resistant rubber material.

2. The mixing device for casting raw materials in a resin concrete electrolytic cell according to claim 1, characterized in that, The inner ring of the scraper ring (15) is provided with a mounting groove (18), and the outer ring of the mounting ring (9) is provided with a fixing ring (19) that cooperates with the mounting groove (18).

3. The mixing device for casting raw materials in a resin concrete electrolytic cell according to claim 2, characterized in that, The scraper ring (15) is also provided with a positioning component for positioning the scraper ring (15).

4. The mixing device for casting raw materials in a resin concrete electrolytic cell according to claim 3, characterized in that, The positioning assembly includes a compression ring (14), a connecting rod (12), and a positioning plate (10). The compression ring (14) is integrally formed in a trumpet shape and is located at the upper and lower ends of the scraper ring (15). The compression ring (14) is provided with several hinge seats (13). The positioning plate (10) is movably mounted on the scraper ring (15). The positioning plate (10) is provided with hinge seats (11). One end of the connecting rod (12) is hinged to the hinge seat (13), and the other end is hinged to the hinge seat (11). The mounting ring (9) is provided with several positioning grooves at positions corresponding to the positioning plate (10).

5. The mixing device for casting raw materials in a resin concrete electrolytic cell according to claim 4, characterized in that, The mounting ring (9) is provided with multiple U-shaped reinforcing plates (16), and the reinforcing plates (16) are provided with guide grooves (17) on both sides. The positioning plate (10) is provided with guide protrusions on both sides that cooperate with the guide grooves (17).

6. The mixing device for casting raw materials in a resin concrete electrolytic cell according to claim 1, characterized in that, The driving mechanism includes a drive motor (4) and a lead screw (5). The drive motor (4) is installed on the upper end of the mixing tank (3). The drive motor (4) is connected to the lead screw (5) in a transmission manner. The mounting ring (9) is provided with a threaded hole that is threaded to the lead screw (5).

7. The mixing device for casting raw materials in a resin concrete electrolytic cell according to claim 1, characterized in that, The stirring assembly includes a stirring motor (8), a stirring shaft (6), and several stirring paddles (7). The stirring motor (8) is installed on the upper end of the stirring tank (3), the stirring shaft (6) is connected to the stirring motor (8) in a driving connection, and several stirring paddles (7) are installed on the stirring shaft (6).

8. The mixing device for casting raw materials in a resin concrete electrolytic cell according to claim 1, characterized in that, The conveying assembly includes a conveying pump (1) and a conveying pipe (2). One end of the conveying pipe (2) is connected to the conveying pump (1), and the other end is connected to the inside of the mixing tank (3).

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