A pre-mature heating device for polyurethane production

Abstract

This invention discloses a pre-curing heating device for the production of polyurethane polymer materials, relating to the field of polyurethane production technology. A drive motor is positioned above the device body, with its output end perpendicular to the upper surface of the device body and penetrating through it. A heating tank is located inside the device body and rotatably connected to it via a support block, forming a water bath chamber between the heating tank and the device body. A transmission mechanism is located inside a mixing tank and is fixedly connected to the inner wall of the device body via a fixing frame, and is also fixedly connected to the heating tank via a driven gear ring. A heating assembly is located below the transmission mechanism and connected to it, used for hot air heating of the polyurethane inside the heating tank. A solenoid valve is located below the device body and controls the openings of the water bath chamber and the heating tank.

Description

Technical Field

[0001] This invention relates to the field of polyurethane production technology, and more specifically to a pre-curing heating device for the production of polyurethane polymer materials. Background Technology

[0002] Polyurethane, short for polyurethane foam, comes in two main types: polyester and polyether. It can be used to make polyurethane plastics (primarily foamed plastics), polyurethane fibers (known as spandex in China), polyurethane rubber, and elastomers. Soft polyurethane (PU) primarily has a thermoplastic linear structure and offers better stability, chemical resistance, resilience, and mechanical properties than PVC foam. It also exhibits lower compression set and good thermal insulation, sound insulation, shock absorption, and anti-toxic properties, making it suitable for packaging, sound insulation, and filtration. Rigid PU plastics are lightweight, offer excellent sound and thermal insulation, are chemically resistant, have good electrical properties, are easy to process, and have low water absorption. They are mainly used in construction, automotive, and aerospace industries as structural materials for thermal insulation. Polyurethane elastomers have properties between plastics and rubber, including oil resistance, abrasion resistance, low-temperature resistance, aging resistance, high hardness, and elasticity. They are primarily used in the footwear and medical industries. Polyurethane can also be used to make adhesives, coatings, and synthetic leather. During polyurethane processing, a pre-curing process is required, which involves using a pre-curing heating device.

[0003] Currently, existing polyurethane pre-curing heating devices still have many technical defects in practical production applications. First, most existing heating devices adopt a single fixed heating structure, generally a mode of static barrel, single stirring and single-sided heating. The stirring structure is fixed and the stirring range is limited, which cannot achieve all-round, dead-angle-free mixing of materials. This leads to the stratification and accumulation of polyurethane materials in the heating barrel. At the same time, as the heating time of polyurethane materials increases, the fluidity of polyurethane materials gradually decreases and the viscosity continues to increase. Conventional stirring structures are difficult to effectively disperse and stir high-viscosity materials, which can easily cause uneven heating of materials in some areas, resulting in temperature differences between local overheating and charring and local uncuring. This seriously affects the uniformity of polyurethane pre-curing and reduces the performance of the finished product.

[0004] Secondly, traditional heating devices use relatively simple heating methods, mostly bottom or side-wall fixed water bath heating or hot air heating. The heat source is concentrated and the heat diffusion rate is slow, making it impossible to simultaneously complete full-area heating during the dynamic process of material mixing and conveying. The delayed heat transfer further aggravates the temperature difference of the materials, resulting in inconsistent pre-cooking effects. In addition, conventional mixing components lack an adaptive adjustment structure and cannot adapt the mixing amplitude according to changes in material viscosity. High-viscosity materials are prone to adhere to the inner wall of the heating tank and the surface of the mixing structure, which not only causes material waste but also continuously affects the accuracy and efficiency of subsequent heating and mixing operations, increasing equipment cleaning costs and production losses.

[0005] Finally, the transmission structure of existing equipment is simple in design, and most of them can only realize the single rotation of the stirring structure. They cannot synchronously drive the heating tank to move in coordination. The static heating of materials accounts for a high proportion, the dynamic mixing effect is poor, the hot air heating and mechanical stirring cannot be coordinated and linked, the heating, stirring and material conveying processes are independent of each other, the overall operating efficiency of the equipment is low, and it is difficult to meet the production needs of modern polyurethane large-scale and high-precision pre-curing.

[0006] In view of the above, the present invention designs a pre-curing heating device for the production of polyurethane polymer materials, which solves the above-mentioned technical problems. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a pre-curing heating device for the production of polyurethane polymer materials, which solves the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a pre-curing heating device for the production of polyurethane polymer materials, comprising a device body, wherein multiple support seats are provided at the bottom of the device body and the multiple support seats are connected by a load-bearing plate; multiple feed inlets are provided at the top of the device body and feed pipes are provided at the feed inlets; the device further comprises: a drive motor, disposed above the device body, the output end of the drive motor being perpendicular to the upper end surface of the device body and penetrating through the device body; a heating tank, disposed inside the device body and rotatably connected to the device body by a support block, the heating tank and the device body forming a water bath chamber; and a transmission mechanism, disposed inside a mixing tank, the transmission mechanism being connected to the device body by a fixed frame. The device is fixedly connected to the inner wall of the main body, and the transmission mechanism is fixedly connected to the heating tank via a driven gear ring. A heating component is located below the transmission mechanism and connected to it. The heating component is used to heat the polyurethane in the heating tank with hot air. A solenoid valve is located below the main body of the device. The solenoid valve is used to control the opening of the water bath chamber and the heating tank. The drive motor drives the heating tank to move synchronously through the transmission mechanism, and the transmission mechanism drives the stirring rod to rotate, so that the polyurethane in the heating tank is uniformly mixed. The transmission mechanism drives the heating component to stir and transport the material in the heating tank. At the same time, the heating component heats the polyurethane with hot air during the conveying and stirring process, thereby avoiding temperature differences in the polyurethane in the heating tank during the pre-curing process.

[0009] Preferably, the transmission mechanism includes a driving gear, a fixed frame, planetary gears, and a driven gear ring; the fixed frame is fixedly mounted on the inner wall of the device body and is positioned above the heating barrel; the driving gear is fixedly mounted on the output shaft of the drive motor and is rotatably mounted below the fixed frame; the planetary gear is annularly mounted on the outer circumferential surface of the driving gear and meshes with the driving gear; the driven rack is fixedly mounted on the inner wall of the heating barrel and meshes with multiple planetary gears.

[0010] Preferably, each of the plurality of planetary gears is connected to a stirring rod, and a stirring assembly is connected to the stirring rod. The stirring assembly can stir and turn the polyurethane material in the heating tank through a transmission mechanism.

[0011] Preferably, the stirring assembly includes a moving block, a moving groove, a connecting spring, and an electromagnet. The stirring rod has symmetrically arranged moving grooves, and a moving block is disposed through the stirring rod. A limit block is disposed inside the moving block, and the limit block is disposed in the moving groove. A connecting spring is disposed in the moving groove, with one end of the connecting spring fixedly connected to the moving groove and the other end of the connecting spring fixedly connected to the limit block. An electromagnet is disposed on the side of the moving groove away from the connecting spring, and an identical electromagnet is disposed on the side of the limit block away from the connecting spring. When the electromagnets are energized with the same current, the two electromagnets repel each other due to their similar poles, causing the moving block to press against the connecting spring along the moving groove. When the electromagnets are de-energized, the moving block resets due to the elastic potential energy of the connecting spring.

[0012] Preferably, the outer circumferential surface of the moving block is provided with a ring array of multiple rotating blades. When the planetary gear drives the moving block to rotate through the stirring rod, the rotating blades can fit against the inner wall of the mixing tank.

[0013] Preferably, the heating assembly includes an air supply pipe and spiral blades. One end of the air supply pipe is connected to the output end of the drive motor, and the other end of the air supply pipe is attached to the bottom of the heating barrel. Spiral blades are provided on the outer circumferential surface of the air supply pipe, and the air supply pipe has an air supply chamber. Multiple sets of air supply holes are provided on the air supply pipe. The air supply holes are used to deliver hot air in the air supply pipe from an external device to the polyurethane in the heating barrel.

[0014] Preferably, the surface of the spiral blade is provided with small protrusions. When the device body heats the polyurethane, the flowability of the polyurethane deteriorates with the change of heating time. The small protrusions on the spiral blade can increase the friction between the spiral blade and the polyurethane.

[0015] Preferably, the spiral blade has a hollow structure and is connected to the air supply pipe. The supply pipe delivers hot air to the edge of the spiral blade. The edge of the spiral blade is provided with multiple heating holes. When the spiral blade rotates and flips the polyurethane, the hot air heats the polyurethane evenly through the heating holes.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. This invention provides a pre-curing heating device for the production of polyurethane polymer materials. This device, through a dedicated transmission mechanism, utilizes a drive motor in conjunction with planetary gears, a driving gear, and a driven gear ring to achieve dual dynamic operation effects: on one hand, it drives the entire heating tank to rotate, breaking the limitations of traditional static heating; on the other hand, it drives the stirring rods below each planetary gear to rotate autonomously, achieving bidirectional linkage between the heating tank rotation and the stirring rod rotation. Simultaneously, it is equipped with a through-type hollow air supply pipe and hollow spiral blades with heating holes, outputting hot air synchronously during the dynamic process of material stirring, turning, and conveying. This achieves integrated operation of stirring, conveying, and full-area heating, completely eliminating the material temperature differences caused by static heating and localized heating in traditional equipment, ensuring the overall uniformity of polyurethane material pre-curing, and significantly improving product molding quality and performance stability.

[0018] 2. The present invention provides a pre-curing heating device for the production of polyurethane polymer materials. This device cooperates with a stirring assembly through a transmission mechanism. When the polyurethane is heated, the heating tank rotates, and the stirring rod rotates inside the heating tank, thereby stirring the polyurethane in the heating tank in all directions. At this time, the moving block on the stirring rod moves up and down in the moving groove. While the moving block is reciprocating, the stirring rod drives the moving block to rotate. The rotation of the moving block enables the rotating blades to rotate synchronously. Since the rotating blades can adhere to the inner wall of the heating tank in the initial state, when the rotating blades rotate, they can effectively scrape off and disperse the high-viscosity material adhering to the inner wall of the heating tank, avoiding material accumulation, adhesion and charring, and comprehensively improving the mixing effect of the material.

[0019] 3. The present invention provides a pre-curing heating device for the production of polyurethane polymer materials. This device adopts a double-layer hot air heating structure. The hollow gas pipe can achieve hot air heating in the central area of ​​the barrel through multiple sets of gas outlets on its surface. The hollow spiral blades, which are connected to the gas pipe, can achieve all-round hot air heating of the material surface and material gaps through edge heating holes. At the same time, the small protrusions on the surface of the spiral blades can increase the friction with the material when the material is in a high viscosity state, improve the material turning and conveying efficiency, and allow the hot air to fully penetrate into the interior of the material, avoiding heat retention and waste, greatly improving the heat utilization rate and overall pre-curing processing efficiency, shortening the production cycle, and adapting to the needs of large-scale industrial production. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a partial cross-sectional view of the overall structure of the present invention;

[0022] Figure 3 For the present invention Figure 2 A magnified view of a section at point A in the middle;

[0023] Figure 4 This is a partial view of the main body of the device of the present invention;

[0024] Figure 5 This is a schematic diagram of the overall structure of the transmission mechanism, the stirring assembly, and the heating assembly of the present invention.

[0025] Figure 6 This is a partial view of the overall structure of the transmission mechanism, in conjunction with the stirring assembly and the heating assembly of the present invention.

[0026] Figure 7 For the present invention Figure 6 A magnified view of a section at point B in the middle.

[0027] Figure label:

[0028] 1. Device body; 11. Support base; 12. Water bath chamber; 13. Feed pipe; 2. Drive motor; 3. Transmission mechanism; 31. Drive gear; 32. Fixing frame; 33. Planetary gear; 331. Stirring rod; 34. Driven gear ring; 4. Heating tank; 41. Support block; 5. Stirring assembly; 51. Moving block; 511. Rotating blade; 512. Limiting block; 52. Moving groove; 53. Connecting spring; 54. Electromagnet; 6. Heating assembly; 61. Gas supply pipe; 62. Spiral blade; 63. Heating hole; 64. Gas supply chamber; 7. Solenoid valve; Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] refer to Figures 1 to 7As shown, a pre-curing heating device for the production of polyurethane polymer materials includes a device body 1. Multiple support seats 11 are provided at the bottom of the device body 1, and the multiple support seats 11 are connected by load-bearing plates. Multiple feed inlets are opened at the top of the device body 1, and feed pipes 13 are provided at the feed inlets. The device also includes: a drive motor 2, located above the device body 1, with its output end perpendicular to the upper surface of the device body 1 and penetrating through the device body 1; a heating tank 4, located inside the device body 1, and rotatably connected to the device body 1 by a support block 41, forming a water bath chamber 12 between the heating tank 4 and the device body 1; and a transmission mechanism 3, located inside a mixing tank, and fixedly connected to the inner wall of the device body 1 by a fixing frame 32. The transmission mechanism 3 is fixedly connected to the heating tank 4 via the driven gear ring 34; the heating component 6 is located below the transmission mechanism 3 and connected to the transmission mechanism 3. The heating component 6 is used to heat the polyurethane in the heating tank 4 with hot air; the solenoid valve 7 is located below the device body 1. The solenoid valve 7 is used to control the opening of the water bath chamber 12 and the heating tank 4. The drive motor 2 drives the heating tank 4 to move synchronously through the transmission mechanism 3, and the transmission mechanism 3 drives the stirring rod 331 to rotate, so that the polyurethane in the heating tank 4 is uniformly mixed. The transmission mechanism 3 drives the heating component 6 to stir and transport the material in the heating tank 4. At the same time, the heating component 6 heats the polyurethane with hot air during the conveying and stirring process, thereby avoiding the phenomenon of temperature difference in the polyurethane in the heating tank 4 during the pre-curing process.

[0031] Specifically, the transmission mechanism 3 includes a driving gear 31, a fixed frame 32, a planetary gear 33, and a driven gear ring 34; the fixed frame 32 is fixedly installed on the inner wall of the device body 1 and is positioned above the heating barrel 4; the driving gear 31 is fixedly installed on the output shaft of the drive motor 2 and is rotatably positioned below the fixed frame 32; the planetary gear 33 is annularly arranged on the outer circumferential surface of the driving gear 31 and meshes with the driving gear 31; the driven rack is fixedly installed on the inner wall of the heating barrel 4 and meshes with multiple planetary gears 33.

[0032] Specifically, each of the plurality of planetary gears 33 is connected to a stirring rod 331, and a stirring assembly 5 is connected to the stirring rod 331. The stirring assembly 5 can stir and turn the polyurethane material in the heating tank 4 through the transmission mechanism 3.

[0033] Specifically, the stirring assembly 5 includes a moving block 51, a moving groove 52, a connecting spring 53, and an electromagnet 54. The stirring rod 331 has symmetrically arranged moving grooves 52, and a moving block 51 is disposed through the stirring rod 331. A limit block 512 is provided inside the moving block 51, and the limit block 512 is disposed in the moving groove 52. A connecting spring 53 is disposed in the moving groove 52, with one end of the connecting spring 53 fixedly connected to the moving groove 52 and the other end of the connecting spring 53 fixedly connected to the limit block 512. An electromagnet 54 is disposed on the side of the moving groove 52 away from the connecting spring 53, and an identical electromagnet 54 is disposed on the side of the limit block 512 away from the connecting spring 53. When the electromagnets 54 are energized with the same current, the two electromagnets 54 repel each other due to their similar poles, causing the moving block 51 to press against the connecting spring 53 along the moving groove 52. When the electromagnet 54 is de-energized, the moving block 51 returns to its original position due to the elastic potential energy of the connecting spring 53.

[0034] Specifically, the outer circumferential surface of the moving block 51 is provided with a ring array of multiple rotating blades 511. When the planetary gear 33 drives the moving block 51 to rotate through the stirring rod 331, the rotating blades 511 can fit against the inner wall of the mixing tank.

[0035] Specifically, the heating component 6 includes an air supply pipe 61 and a spiral blade 62. One end of the air supply pipe 61 is connected to the output end of the drive motor 2, and the other end of the air supply pipe 61 is attached to the bottom of the heating barrel 4. The spiral blade 62 is provided on the outer circumferential surface of the air supply pipe 61, and the air supply pipe 61 has an air supply chamber 64. Multiple sets of air supply holes are provided on the air supply pipe 61. The air supply holes are used to transport the hot air in the air supply pipe 61 from the external device to the polyurethane in the heating barrel 4.

[0036] Specifically, the surface of the spiral blade 62 is provided with small protrusions. When the device body 1 is heating the polyurethane, the flowability of the polyurethane deteriorates as the heating time changes. The small protrusions on the spiral blade 62 can increase the friction between the spiral blade 62 and the polyurethane.

[0037] Specifically, the spiral blade 62 has a hollow structure and is connected to the air supply pipe 61. The supply pipe delivers hot air to the edge of the spiral blade 62. The edge of the spiral blade 62 is provided with multiple heating holes 63. When the spiral blade 62 rotates to flip the polyurethane, the hot air heats the polyurethane evenly through the heating holes 63.

[0038] During operation, before starting work, the operator first injects warm water of a certain temperature into the water bath chamber 12 through the feed pipe 13 to fill the water bath chamber 12 with hot water and heat the polyurethane in the heating tank 4. Then the operator adds the polyurethane into the heating tank 4 and starts the drive motor 2. The drive motor 2 rotates and drives the coaxially set drive gear 31 to rotate. The rotation of drive gear 31 drives the meshing planetary gear 33 to rotate. At the same time, the planetary gear 33 drives the meshing driven gear ring 34 to move synchronously. Since the driven gear ring 34 is set on the inner wall of the heating tank 4, the planetary gear 33 can drive the heating tank 4 to rotate inside the device body 1 through the support block 41.

[0039] At this time, in order to effectively scrape off and break up the high-viscosity material adhering to the inner wall of the heating tank 4, avoid material accumulation, adhesion and coking, and improve the material turning and mixing effect in all aspects, the planetary gear 33 can drive the coaxial stirring rod 331 to rotate during the rotation process. Through the rotation of the heating tank 4 and the rotation of the stirring rod 331, the polyurethane in the heating tank 4 can be uniformly stirred, avoiding the problem of local excessively high or low temperature of the polyurethane in the heating tank 4.

[0040] As time progresses, the fluidity of polyurethane decreases during heating, causing it to adhere to the inner wall of the heating tank 4. Additionally, the upper and lower layers of polyurethane experience temperature inconsistencies. To prevent this, a current in the same direction is applied to the electromagnet 54. This causes the electromagnet 54 on the moving groove 52 to push the electromagnet 54 on the limiting block 512. Through the principle of like poles repelling each other, the limiting block 512 presses upward against the connecting spring 53 within the moving groove 52, thus allowing the moving block 51 to move within the moving groove 52. To enable the moving block 51 to reciprocate within the moving groove 52, simply adjust the... Two electromagnets 54 are switched on and off. When the electromagnets 54 are de-energized, the moving block 51 returns to its initial position due to the elastic potential energy of the connecting spring 53. Since the limiting block 512 is stuck in the moving groove 52 and the stirring rod 331 continues to rotate, the stirring rod 331 can drive the moving block 51 to rotate. While the stirring rod 331 drives the moving block 51 to rotate, the rotating blade 511 cleans the material adhering to the outer circumferential surface of the limiting cylinder and the inner wall of the heating barrel 4. At the same time, the moving block 51, which moves up and down and rotates, can intensify the flow of polyurethane and avoid the problem of inconsistent temperature between the upper and lower layers of polyurethane.

[0041] To ensure a uniform internal temperature of the polyurethane within the heating tank 4, external hot air is blown into the polyurethane through the air outlets on the air supply pipe 61. Simultaneously, the rotation of the spiral blades 62 transports the polyurethane at the bottom of the heating tank upwards, thus achieving polyurethane turnover and preventing temperature differences caused by prolonged polyurethane accumulation. During the turnover process, the hollow spiral blades 62, in conjunction with the heating holes 63, can uniformly heat the interior of the polyurethane, ensuring a uniform temperature between the upper and lower layers of polyurethane within the heating tank 4. This allows hot air to fully penetrate the material, preventing heat retention and waste, significantly improving heat utilization and overall pre-curing processing efficiency, shortening the production cycle, and adapting to the needs of large-scale industrial production. After production is completed, the outlets of the water bath chamber 12 and the heating tank 4 are controlled by the solenoid valve 7 to discharge the polyurethane inside the heating tank 4 and simultaneously discharge the hot water in the water bath chamber 12 to the outside.

[0042] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within the scope of its essence and protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A pre-curing heating device for the production of polyurethane polymer materials, comprising a device body (1), wherein a plurality of support seats (11) are provided at the bottom end of the device body (1), and the plurality of support seats (11) are connected by a load-bearing plate, and a plurality of feed inlets are provided at the top of the device body (1), wherein a feed pipe (13) is provided at each feed inlet, characterized in that, The device also includes: A drive motor (2) is set above the device body (1). The output end of the drive motor (2) is set perpendicular to the upper surface of the device body (1), and the output end of the drive motor (2) passes through the device body (1). A heating tank (4) is installed inside the device body (1), and the heating tank (4) is rotatably connected to the device body (1) through a support block (41). A water bath chamber (12) is formed between the heating tank and the device body. The transmission mechanism (3) is set inside the mixing tank. The transmission mechanism (3) is fixedly connected to the inner wall of the device body (1) through the fixing frame (32), and the transmission mechanism (3) is fixedly connected to the heating tank (4) through the driven gear ring (34). Heating component (6) is located below transmission mechanism (3) and is connected to transmission mechanism (3). Heating component (6) is used to heat polyurethane in heating barrel (4) with hot air. A solenoid valve (7) is located below the device body (1). The solenoid valve (7) is used to control the openings of the water bath chamber (12) and the heating tank (4). The drive motor (2) drives the heating barrel (4) to move synchronously through the transmission mechanism (3), and the transmission mechanism (3) drives the stirring rod (331) to rotate, so that the polyurethane in the heating barrel (4) is evenly mixed. The transmission mechanism (3) drives the heating component (6) to stir and transport the material in the heating barrel (4). At the same time, the heating component (6) heats the polyurethane with hot air during the conveying and stirring process, thereby avoiding the phenomenon of temperature difference in the polyurethane in the heating barrel (4) during the pre-curing process.

2. The pre-curing heating device for polyurethane production according to claim 1, characterized in that: The transmission mechanism (3) includes a driving gear (31), a fixed frame (32), a planetary gear (33), and a driven gear ring (34). The fixing frame (32) is fixedly installed on the inner wall of the device body (1), and the fixing frame (32) is installed above the heating barrel (4); The drive gear (31) is fixedly mounted on the output shaft of the drive motor (2), and the drive gear (31) is rotatably mounted below the fixed frame (32); Planetary gear (33) is annularly disposed on the outer circumferential surface of the driving gear (31), and the planetary gear (33) meshes with the driving gear (31); A driven rack is fixedly installed on the inner wall of the heating barrel (4), and the driven rack meshes with multiple planetary gears (33).

3. The pre-curing heating device for polyurethane production according to claim 2, characterized in that: Each of the planetary gears (33) is connected to a stirring rod (331), and a stirring assembly (5) is connected to the stirring rod (331). The stirring assembly (5) can stir and turn the polyurethane material in the heating tank (4) through the transmission mechanism (3).

4. The pre-curing heating device for polyurethane production according to claim 3, characterized in that: The stirring assembly (5) includes a moving block (51), a moving groove (52), a connecting spring (53), and an electromagnet (54). The stirring rod (331) has symmetrically arranged moving grooves (52), and a moving block (51) is inserted through the stirring rod (331). A limit block (512) is provided inside the moving block (51), and the limit block (512) is located within the moving groove (52). A connecting spring (53) is provided within the moving groove (52), and one end of the connecting spring (53) is fixedly connected to the moving groove (52). The other end of the connecting spring (53) is fixedly connected to the limiting block (512). An electromagnet (54) is provided on the side of the moving groove (52) away from the connecting spring (53), and the same electromagnet (54) is provided on the side of the limiting block (512) away from the connecting spring (53). When the electromagnets (54) are connected to the same current, the two electromagnets (54) repel each other due to their similar poles, causing the moving block (51) to press the connecting spring (53) along the moving groove (52). When the electromagnets (54) are de-energized, the moving block (51) is reset due to the elastic potential energy of the connecting spring (53).

5. The pre-curing heating device for producing polyurethane polymer materials according to claim 4, characterized in that: The outer circumferential surface of the moving block (51) is provided with a ring array of multiple rotating blades (511). When the planetary gear (33) drives the moving block (51) to rotate through the stirring rod (331), the rotating blades (511) can fit against the inner wall of the mixing tank.

6. The pre-curing heating device for polyurethane production according to claim 1, characterized in that: The heating component (6) includes an air supply pipe (61) and a spiral blade (62). One end of the air supply pipe (61) is connected to the output end of the drive motor (2), and the other end of the air supply pipe (61) is attached to the bottom of the heating barrel (4). The spiral blade (62) is provided on the outer circumferential surface of the air supply pipe (61), and the air supply pipe (61) has an air supply chamber (64). Multiple sets of air supply holes are provided on the air supply pipe (61). The air supply holes are used to transport the hot air in the air supply pipe (61) from the external device to the polyurethane in the heating barrel (4).

7. The pre-curing heating device for polyurethane production according to claim 6, characterized in that: The surface of the spiral blade (62) is provided with small protrusions. When the device body (1) heats the polyurethane, the flowability of the polyurethane deteriorates with the change of heating time. The small protrusions on the spiral blade (62) can increase the friction between the spiral blade (62) and the polyurethane.

8. A pre-curing heating device for the production of polyurethane polymer materials according to claim 7, characterized in that: The spiral blade (62) has a hollow structure and is connected to the gas delivery pipe (61). The delivery pipe delivers hot air to the edge of the spiral blade (62). Multiple heating holes (63) are provided on the edge of the spiral blade (62). When the spiral blade (62) rotates to flip the polyurethane, the hot air heats the polyurethane evenly through the heating holes (63).

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