Mixing device for polyurethane processing

Abstract

The invention relates to the technical field of polyurethane production, and particularly discloses a mixing device for polyurethane processing, which comprises a mixing barrel, a partition plate is arranged in the mixing barrel, a detachable cover plate is arranged at the bottom of the mixing barrel, a first stirring shaft is arranged on the cover plate, and a plurality of detachable rectangular stirring blades are arranged on the first stirring shaft. A first motor is fixed to the bottom of the cover plate, the output end of the first motor is connected with the first stirring shaft, a plurality of material conveying groove holes are formed in the rectangular stirring blades, a first feeding hopper is fixed to the top of the mixing barrel, and a heating resistance wire is wound around the outer wall of the smashing and melting chamber and connected with an external power source. Liquid outlet holes are evenly formed in the position, above the partition plate, in the smashing and melting chamber, and first electromagnetic valves are fixed in the liquid outlet holes. Liquid quantitative feeding, solid smashing and melting and full stirring and mixing of polyurethane raw materials can be achieved.

Description

Technical Field

[0001] This invention relates to the field of polyurethane processing and production technology, and more specifically, to a mixing apparatus for polyurethane processing. Background Technology

[0002] Polyurethane, as a high-performance polymer material, is widely used in building insulation, automobile manufacturing, household products, adhesives and other fields. The uniformity, efficiency and process stability of raw material mixing during its processing directly determine the mechanical properties, appearance quality and pass rate of the product. The processing and production of polyurethane places stringent requirements on mixing equipment. However, there are some problems to be solved in the existing polyurethane processing mixing equipment.

[0003] 1. First, most polyurethane processing and mixing devices in the prior art use ordinary stirring blades for mixing, which results in a large mixing dead zone. Some mixing devices allow the stirring blades to move up and down to expand the mixing range, which can have some effect, but cannot completely eliminate the mixing dead zone and the structure is relatively complex and prone to failure.

[0004] 2. Secondly, some of the raw materials for polyurethane production are large solid materials that need to be crushed and melted before they can be mixed. Existing polyurethane processing and mixing devices lack components for crushing and melting solid materials. Relying on other equipment to crush and melt the solid materials before mixing will lead to reduced production efficiency and increased costs.

[0005] 3. Finally, polyurethane requires the addition of some liquid raw materials during the production process. In the existing technology, the amount of liquid in the polyurethane raw materials cannot be precisely controlled during addition, resulting in poor quality of the finished polyurethane product and difficulty in controlling production costs. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention provides a mixing device for polyurethane processing to solve the technical problems mentioned in the background art. Technical solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a mixing device for polyurethane processing, comprising a mixing tank, a partition plate inside the mixing tank, a crushing component and a melting component above the partition plate, and a stirring and mixing component below the partition plate. The stirring and mixing component includes a detachable cover plate at the bottom of the mixing tank, a first stirring shaft on the cover plate, multiple detachable rectangular stirring blades on the first stirring shaft, a first motor fixedly mounted at the bottom of the cover plate, the output end of the first motor connected to the first stirring shaft, multiple material feeding slots on the rectangular stirring blades, a first feed hopper fixedly mounted at the top of the mixing tank, and a crushing and melting chamber above the partition plate in the melting component. A heating resistance wire is wound around the outer wall of the crushing and melting chamber and connected to an external power source. Liquid outlet holes are uniformly arranged above the partition plate in the crushing and melting chamber, and a first solenoid valve is fixedly mounted in each liquid outlet hole.

[0008] According to one or more embodiments of the present invention, the pulverizing assembly includes a second stirring shaft movably disposed within a pulverizing and melting chamber, a plurality of pulverizing and stirring blades fixedly disposed on the second stirring shaft, a second motor fixedly disposed on the outer wall of the pulverizing and melting chamber, the second motor passing through the outer wall of the mixing tank, and the output end of the second motor being connected to the second stirring shaft. By providing the pulverizing assembly, materials poured in through the first feed hopper can be pulverized.

[0009] According to one or more embodiments of the present invention, a second feed hopper is fixedly provided on the mixing tank, the feed end of the second feed hopper is fixed to the bottom of the partition plate, and a second solenoid valve is fixedly provided inside the feed hopper. By providing the second feed hopper, liquid materials can be directly stirred and mixed, and the second solenoid valve can control the opening and closing of the second feed hopper and the mixing tank.

[0010] According to one or more embodiments of the present invention, a screw is movably disposed in the inner wall of the second feed hopper, a throttle is fixedly disposed on the screw, and a baffle is helically connected to the screw. The position of the baffle can be adjusted by setting the screw, the throttle and the baffle, and the maximum amount of liquid material that can be added can be adjusted by adjusting the position of the baffle.

[0011] According to one or more embodiments of the present invention, a feeding hole is provided on the baffle, and a movable plate is movably connected to the bottom of the baffle via a connecting shaft. By setting the connecting shaft and the movable plate, no more liquid material will enter the mixing tank after the amount of material added reaches the set maximum amount of material.

[0012] According to one or more embodiments of the present invention, four support legs are fixedly arranged around the mixing tank. Four first threaded holes are respectively opened around the perimeter of the cover plate and around the perimeter of the bottom of the mixing tank. The cover plate is fixed to the mixing tank by connecting the first threaded holes with first bolts. Multiple fixing grooves are fixedly arranged on the first stirring shaft. Two second threaded holes are respectively opened on the fixing grooves and the rectangular stirring blade. The rectangular stirring blade is fixed to the first stirring shaft by connecting the second threaded holes with second bolts. The cover plate is conveniently disassembled by using bolts to fix it, which facilitates the maintenance of the device. The rectangular stirring blade is conveniently disassembled, cleaned and replaced by using bolts to fix it.

[0013] According to one or more embodiments of the present invention, an extension plate is fixedly provided on the movable plate, and two springs are fixedly provided on the extension plate. The other end of the springs is fixed to a baffle. By providing the extension plate, the movable plate can be limited so that the material will not exceed the maximum amount of liquid material that can be added. The springs can be provided so that the movable plate can be reset after the feeding is completed.

[0014] According to one or more embodiments of the present invention, the surface of the mixing tank is provided with an anti-corrosion layer, the anti-corrosion coating comprising the following components: 54.5-68.1% resin, 9.5-14.8% curing agent, 10-15% self-made titanium-molybdenum alloy nanopowder, 10-15% self-made modified wear-resistant and anti-friction filler, and 0.5-0.8% additives; the percentages are by mass. Beneficial effects

[0015] Compared with the prior art, the present invention provides a mixing apparatus for polyurethane processing, which has the following beneficial effects: 1. By replacing the traditional mixing blades with rectangular mixing blades, the mixing range can be expanded. The simpler structure is less prone to damage. By opening liquid flow channels on the rectangular mixing blades, the material can pass through the liquid flow channels during mixing without getting stuck.

[0016] 2. By setting up crushing and melting components, large pieces of solid material can be crushed and melted without the need for other equipment to crush and melt them beforehand. Simply pour the large pieces of solid material into the crushing and melting chamber through the first feed hopper. The crushing and stirring blades in the crushing and melting chamber will crush the large pieces of solid material, and the heating resistance wire wound on the crushing and melting chamber will melt the solid material. The completely liquefied material can be controlled by the first solenoid valve to enter the stirring and mixing component, which improves the working efficiency of the device.

[0017] 3. By setting baffles, screws, and movable plates, the maximum amount of material that can enter the mixing tank through the second feed hopper can be adjusted, which solves the problem mentioned in the background technology that the amount of liquid in polyurethane raw materials cannot be accurately controlled when feeding, thus improving the quality of finished polyurethane products and saving production costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a mixing device for polyurethane processing according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of a mixing device for polyurethane processing according to the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the cross-sectional structure of a mixing device for polyurethane processing according to the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the cross-sectional structure of a mixing device for polyurethane processing according to the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the installation structure of the stirring and mixing component in this invention; Figure 6 This is a schematic diagram of the installation structure of the rectangular stirring blade in this invention; Figure 7 This is a schematic diagram of the internal structure of the second feed hopper in this invention; Figure 8 In this invention Figure 7 A partial structural diagram at point A.

[0019] In the diagram: 1. Mixing tank; 2. Divider plate; 3. Cover plate; 4. First stirring shaft; 5. Rectangular stirring blade; 6. First motor; 7. Feed chute; 8. First feed hopper; 9. Crushing and melting chamber; 10. Heating resistance wire; 11. Liquid outlet; 12. First solenoid valve; 13. Second stirring shaft; 100. Crushing and stirring blade; 14. Second motor; 15. Second feed hopper; 101. Second solenoid valve; 16. Screw; 17. Rotary handle; 18. Baffle; 102. Feeding hole; 19. Connecting shaft; 20. Movable plate; 21. Support leg; 22. First threaded hole; 23. First bolt; 24. Fixing groove; 25. Second threaded hole; 26. Second bolt; 27. Extension plate; 28. Spring. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0023] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

[0024] Please see Figures 1-6 A mixing device for polyurethane processing includes: a mixing tank 1, wherein a partition plate 2 is provided inside the mixing tank 1, dividing the mixing tank 1 into a pretreatment zone (i.e., a zone for crushing and melting large particles) and a mixing zone. A crushing component and a melting component are provided above the partition plate 2, and a mixing component is provided below the partition plate 2. In the prior art, to achieve more uniform mixing of materials, a screw or gear-plate connection is typically used to allow the mixing shaft to move up and down to expand the mixing range. However, this mixing method still has significant dead zones and numerous parts, resulting in a complex structure that is prone to malfunction. The mixing component includes a removable cover plate 3 at the bottom of the mixing tank 1, and a first mixing shaft 4 mounted on the cover plate 3. The upper part is provided with multiple detachable rectangular stirring blades 5. The bottom of the cover plate 3 is fixedly provided with a first motor 6. The output end of the first motor 6 is connected to the first stirring shaft 4. Multiple material passage holes 7 are opened on the rectangular stirring blades 5. This application achieves the purpose of eliminating stirring dead corners to a greater extent by adding rectangular stirring blades 5 and material passage holes 7 without adding lifting components, and at the same time reduces the risk of failure. When the first motor 6 is started, the first motor 6 will drive the first stirring shaft 4 to rotate. The rotation of the first stirring shaft 4 will drive the rectangular stirring blades 5 to rotate. Because the rectangular stirring blades 5 have a large contact area with the material, there are almost no stirring dead corners. During stirring, the material will pass through the material passage holes 7 and will not be blocked by the rectangular stirring blades 5 and thus unable to be fully stirred.

[0025] During polyurethane production, some large solid raw materials cannot be directly mixed with other liquid raw materials. In existing technologies, additional crushing and melting devices are usually required to crush and melt them. This increases production costs by requiring the purchase of additional equipment and reduces production efficiency by requiring the crushed and melted material to be removed and then reintroduced into the mixing device. The mixing tank 1 has a first feed hopper 8 fixed to its top. The melting assembly includes a crushing and melting chamber 9 above a partition plate 2. A heating resistance wire 10 is wound around the outer wall of the crushing and melting chamber 9 and connected to an external power source. The area above the partition plate 2 is the crushing and melting chamber. Four liquid outlet holes 11 are evenly arranged inside the chemical chamber 9. A first solenoid valve 12 is fixedly installed inside each liquid outlet hole 11. By adding a pretreatment zone, this invention enables the device to directly process large solid materials. The large solid materials are simply fed into the mixing tank 1 through the first feed hopper 8. The heating resistance wire 10 is connected to an external power source to heat the heating resistance wire 10, which melts the solid materials into liquid. There is no need to purchase other equipment for pretreatment, which improves production efficiency. After melting, the material can be flowed into the mixing zone by opening the first solenoid valve 12. The four evenly arranged liquid outlet holes 11 can make the melted material enter the mixing zone evenly.

[0026] As a further embodiment, referring to the above figures, the pulverizing component includes a second stirring shaft 13 movably disposed within a pulverizing and melting chamber 9. Multiple sets of pulverizing and stirring blades 100 are fixedly disposed on the second stirring shaft 13. A second motor 14 is fixedly disposed on the outer wall of the pulverizing and melting chamber 9, passing through the outer wall of the mixing tank 1. The output end of the second motor 14 is connected to the second stirring shaft 13. Since the solid material itself is large and melts slowly after being put into the pulverizing and melting chamber 9, this application adds a pulverizing component to accelerate the melting of the material. The second motor 14 is started, driving the second stirring shaft 13 to rotate. The rotation of the second stirring shaft 13 drives the pulverizing and stirring blades 100 to rotate, pulverizing large pieces of material into small particles to accelerate the melting of the material.

[0027] Please see Figure 3 and Figure 7 As an embodiment of the device for precisely controlling the liquid feed rate, a second feed hopper 15 is fixedly installed on the mixing tank 1, the feed end of the second feed hopper 15 is fixed to the bottom of the partition plate 2, and a second solenoid valve 101 is fixedly installed inside the feed hopper 2.

[0028] A screw 16 is movably disposed in the inner wall of the second feed hopper 15, a throttle 17 is fixedly disposed on the screw 16, and a baffle 18 is spirally connected to the screw 16.

[0029] The baffle 18 is provided with a feeding hole 102, and a movable plate 20 is movably connected to the bottom of the baffle 18 via a connecting shaft 19.

[0030] Specifically, by rotating the handle 17, the handle 17 will drive the screw 16 to rotate. The rotation of the screw 16 will drive the baffle 18 to move up and down. The up and down movement of the baffle 18 will change the volume from below the baffle 18 to the second solenoid valve 101. After the baffle 18 is adjusted, liquid material is poured in. When the amount of liquid material reaches the set amount, that is, when the liquid material is pressing against the movable plate 20, the solenoid valve 101 is opened to discharge the set amount of liquid material into the mixing and stirring zone.

[0031] Please see Figure 1 , Figure 2 , Figure 5 and Figure 6 As one embodiment of how to disassemble and install the rectangular stirring blade 5 and the cover plate 3 of this device, four support legs 21 are fixedly arranged around the mixing tank 1. Four first threaded holes 22 are respectively opened around the cover plate 3 and around the bottom of the mixing tank 1. The cover plate 3 is fixed to the mixing tank 1 by connecting the first threaded holes 22 with first bolts 23. Multiple fixing grooves 24 are fixedly arranged on the first stirring shaft 4. Two second threaded holes 25 are respectively opened on the fixing grooves 24 and the rectangular stirring blade 5. The rectangular stirring blade 5 is fixed to the first stirring shaft 4 by connecting the second threaded holes 25 with second bolts 26.

[0032] Specifically, the cover plate 3 can be removed by removing the first bolt 23. Since the cover plate 3 is equipped with the first stirring shaft 8, removing the cover plate 3 will remove the first stirring shaft 8 and the rectangular stirring blade 5 fixed on the first stirring shaft 8 together. If you want to remove a specific rectangular stirring blade 5, after removing the cover plate 3, remove the second bolt 26 fixed on the rectangular stirring blade 5 to be removed.

[0033] Please see Figure 7 and Figure 8 As one embodiment of limiting the position of the movable plate 20 in this device, an extension plate 27 is fixedly provided on the movable plate 20, and two springs 28 are fixed on the extension plate 27, with the other end of the springs 28 fixed to the baffle 18.

[0034] Specifically, when the material in the second feed hopper 15 of this device reaches the set feed amount, the liquid material will lift the movable plate 20, and the extension plate 27 on the movable plate 20 will fit together with the baffle 18 to prevent the movable plate 20 from continuing to move, thereby achieving the function of limiting the movable plate 20. When feeding material into the second feed hopper 15, the movable plate 20 will be pushed down by the material. When feeding stops, the movable plate 20 will be reset under the action of the spring 28.

[0035] In summary, when using the equipment, large solid materials are fed into the mixing tank 1 through the first feed hopper 8. The second motor 14 is started, which drives the second stirring shaft 13 to rotate. The rotation of the second stirring shaft 13 drives the crushing and stirring blades 100 to rotate, crushing the large materials into small particles. The heating resistance wire 10 is connected to an external power source to heat up the heating resistance wire 10, which melts the solid materials into liquid. After melting, the material can be allowed to flow into the mixing zone by opening the first solenoid valve 12. The four evenly arranged liquid outlet holes 11 can ensure that the melted material enters the mixing zone evenly, thereby accelerating the melting of the material.

[0036] When the entire equipment is in use, the first motor 6 is started, which drives the first stirring shaft 4 to rotate. The rotation of the first stirring shaft 4 drives the rectangular stirring blade 5 to rotate. Because the rectangular stirring blade 5 has a large contact area with the material, there are almost no dead corners in the stirring. During stirring, the material will pass through the feed chute hole 7 and will not be blocked by the rectangular stirring blade 5 and thus unable to be fully stirred.

[0037] When the entire device is in use, rotating the handle 17 will drive the screw 16 to rotate. The rotation of the screw 16 will drive the baffle 18 to move up and down. The up and down movement of the baffle 18 will change the volume from below the baffle 18 to the second solenoid valve 101. After the baffle 18 is adjusted, liquid material is poured in. When the amount of liquid material reaches the set amount, that is, when the liquid material presses against the movable plate 20, the solenoid valve 101 is opened to discharge the set amount of liquid material into the mixing and stirring zone. When the material in the second feed hopper 15 of this device reaches the set feed amount, the liquid material will push the movable plate 20 up. The extension plate 27 on the movable plate 20 will fit together with the baffle 18 to prevent the movable plate 20 from moving further, thus achieving the function of limiting the movable plate 20. When material is added to the second feed hopper 15, the movable plate 20 will be pushed down by the material. When the feeding stops, the movable plate 20 will be reset by the action of the spring 28.

[0038] When using the entire equipment, the cover plate 3 can be removed by unscrewing the first bolt 23. Since the first stirring shaft 8 is installed on the cover plate 3, removing the cover plate 3 will remove the first stirring shaft 8 and the rectangular stirring blade 5 fixed on the first stirring shaft 8 together. If you want to remove a specific rectangular stirring blade 5, after removing the cover plate 3, you can remove the second bolt 26 fixed on the rectangular stirring blade 5 to be removed.

[0039] The anti-corrosion coating comprises the following components: 54.5-68.1% resin, 9.5-14.8% curing agent, 10-15% self-made titanium-molybdenum alloy nanopowder, 10-15% self-made modified wear-resistant and anti-friction filler, and 0.5-0.8% additives; the percentages are by mass. In its preparation, the preferred mass percentages are: 50-55% titanium coarse powder, 37-42% molybdenum coarse powder, 3% dispersant, 5% bonding agent, and 0.5% additives. It is fed into external production equipment, and after the finished product is obtained, it is applied to the surface of mixing tank 1 using a spraying tool or a coating brush.

[0040] In all the solutions mentioned above, for connections between two components, welding, bolt and nut connection, bolt or screw connection, or other known connection methods can be selected according to the actual situation. These will not be elaborated here. For all fixed connections mentioned above, welding is preferred. The above are merely preferred embodiments of this application and are not intended to limit the invention. Although this application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A mixing apparatus for polyurethane processing, characterized in that, include: A mixing tank (1) is provided with a partition plate (2). A crushing component and a melting component are provided above the partition plate (2). A stirring and mixing component is provided below the partition plate (2). The stirring and mixing component includes a detachable cover plate (3) at the bottom of the mixing tank (1). A first stirring shaft (4) is provided on the cover plate (3). Multiple detachable rectangular stirring blades (5) are provided on the first stirring shaft (4). A first motor (6) is fixedly provided at the bottom of the cover plate (3). The output end of the first motor (6) is connected to the first stirring shaft (4). Multiple material feeding slots (7) are opened on the rectangular stirring blades (5). The mixing tank (1) is fixed with a first feed hopper (8). The melting assembly includes a crushing and melting chamber (9) above the partition plate (2). A heating resistance wire (10) is wound on the outer wall of the crushing and melting chamber (9). The heating resistance wire (10) is connected to an external power source. A liquid outlet hole (11) is uniformly arranged above the partition plate (2) in the crushing and melting chamber (9). A first solenoid valve (12) is fixedly arranged in the liquid outlet hole (11).

2. The mixing apparatus for polyurethane processing according to claim 1, characterized in that: The pulverizing assembly includes a pulverizing and melting chamber (9) in which a second stirring shaft (13) is movably arranged. Multiple sets of pulverizing and stirring blades (100) are fixedly arranged on the second stirring shaft (13). A second motor (14) is fixedly arranged on the outer wall of the pulverizing and melting chamber (9). The second motor (14) passes through the outer wall of the mixing tank (1). The output end of the second motor (14) is connected to the second stirring shaft (13).

3. A mixing apparatus for polyurethane processing according to claim 2, characterized in that: A second feed hopper (15) is fixedly installed on the mixing tank (1). The feed end of the second feed hopper (15) is fixed to the bottom of the partition plate (2). A second solenoid valve (101) is fixedly installed inside the feed hopper (2).

4. A mixing apparatus for polyurethane processing according to claim 3, characterized in that: A screw (16) is movably disposed in the inner wall of the second feed hopper (15), a throttle (17) is fixedly disposed on the screw (16), and a baffle (18) is spirally connected to the screw (16).

5. A mixing apparatus for polyurethane processing according to claim 4, characterized in that: The baffle (18) has a feeding hole (102), and a movable plate (20) is movably connected to the bottom of the baffle (18) via a connecting shaft (19).

6. A mixing apparatus for polyurethane processing according to claim 1, characterized in that: Four support legs (21) are fixedly arranged around the mixing tank (1). Four first threaded holes (22) are respectively opened around the cover plate (3) and the bottom of the mixing tank (1). The cover plate (3) is fixed to the mixing tank (1) by connecting the first threaded holes (22) with the first bolt (23).

7. A mixing apparatus for polyurethane processing according to claim 6, characterized in that: The first stirring shaft (4) is fixedly provided with multiple fixing grooves (24), and two second threaded holes (25) are respectively opened on the fixing grooves (24) and the rectangular stirring blade (5). The rectangular stirring blade (5) is fixed to the first stirring shaft (4) by connecting the second threaded holes (25) with the second bolts (26).

8. A mixing apparatus for polyurethane processing according to claim 5, characterized in that: An extension plate (27) is fixedly installed on the movable plate (20), and two springs (28) are fixed on the extension plate (27). The other end of the springs (28) is fixed to the baffle (18).

9. A mixing apparatus for polyurethane processing according to claim 1, characterized in that: The surface of the mixing tank (1) is provided with an anti-corrosion layer, which includes the following components: 54.5-68.1% resin, 9.5-14.8% curing agent, 10-15% self-made titanium-molybdenum alloy nanopowder, 10-15% self-made modified wear-resistant and anti-friction filler, and 0.5-0.8% additives; the percentages are by mass.

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