A plastic granulator cooling device

Abstract

The application relates to a plastic granulator cooling device and relates to the technical field of plastic granulators, which comprises a box body, two groups of guide assemblies and a cover plate, the cover plate is movably connected to the top of the box body through hinges, the box body is a double-layer structure, the two groups of guide assemblies are arranged on the top of the cover plate, through the cooperation of a frame, two groups of meshing gear rollers and a second driving motor, gear meshing can ensure that the two groups of rollers rotate synchronously, plastic strips can enter a cooling area at a uniform speed, the plastic strips can be prevented from being transported too fast to cause insufficient cooling, the production efficiency can be prevented from being affected by being too slow, four groups of staggered guide rollers can prolong the residence time of the plastic strips in the box body, the plastic strips have more sufficient time to contact cooling water, and the cooling sufficiency is improved; the first driving motor drives the rotation of a lead screw, the rotation drives the movement of a threaded block and a connecting plate, the position adjustment of the two groups of guide rollers can be realized, and flexible adaptation according to the different thicknesses of the plastic strips can be realized.

Description

Technical Field

[0001] This application relates to plastic granulators, and more particularly to a cooling device for a plastic granulator. Background Technology

[0002] In the plastic granulation process, after the molten plastic is formed into strips by the extrusion mechanism, it needs to be cooled and shaped quickly by a cooling device to ensure the stability of the subsequent pelletizing process and the product quality. At present, the mainstream cooling method in the industry is water cooling. Among them, water tank immersion cooling is widely used because of its simple structure and low cost. Its principle is to achieve heat exchange through direct contact between the plastic strip and the cooling water, so that the plastic strip solidifies from the molten state into a processable solid strip.

[0003] However, traditional water tank cooling devices have significant efficiency defects. The cooling water in the tank is mostly in a natural laminar flow state. The heat exchange between the water flow and the surface of the plastic strip relies solely on slow heat conduction. The thermal resistance boundary layer is difficult to break, resulting in a limited amount of heat exchange per unit time. In order to achieve a sufficient cooling effect, it is necessary to extend the residence time of the plastic strip in the water tank or increase the volume of the water tank. This not only increases the equipment footprint but may also cause adhesion or cracks on the surface of the plastic strip due to untimely cooling.

[0004] To address the aforementioned issues, this application proposes a cooling device for a plastic granulator with higher cooling efficiency. By setting a spiral guide channel in the inner layer of the cooling box to create turbulent flow of the cooling water, and in conjunction with the guiding components and the guide structure, the heat exchange efficiency is significantly enhanced. This shortens the cooling path while achieving rapid and uniform cooling of the plastic strip, effectively solving the technical pain point of low efficiency in traditional cooling methods. Utility Model Content

[0005] The purpose of this application is to provide a cooling device for a plastic granulator, which has the advantages of high efficiency in the cooling zone and solves the problem of low efficiency in traditional cooling methods.

[0006] The cooling device for a plastic granulator provided in this application adopts the following technical solution: it includes a box body, two sets of guide components and a cover plate. The cover plate is movably connected to the top of the box body by a hinge. The box body has a double-layer structure, and the two sets of guide components are arranged on the top of the cover plate.

[0007] By adopting the above technical solution, the cover plate is connected to the top of the box via a hinge, which facilitates opening and closing for maintenance, cleaning or repair of the box interior. It can also close the box during the cooling process. The box adopts a double-layer structure, which lays the foundation for subsequent improvement of thermal insulation performance and structural strength.

[0008] Preferably, the guiding component includes a frame, with rollers provided on both sides of the inner wall of the frame, and gears provided at the other ends of the two sets of rollers. The two sets of gears mesh with each other. A second drive motor is provided on one side of the frame, and the other end of the output shaft of the second drive motor is fixedly connected to the other end of the rollers through a rotating shaft.

[0009] By adopting the above technical solution, through the cooperation of the frame, two sets of meshing gear rollers and the second drive motor, the gear meshing can ensure that the two sets of rollers rotate synchronously, so that the plastic strip enters the cooling area at a uniform speed, avoiding insufficient cooling due to excessively fast conveying, and also preventing production efficiency from being affected by excessively slow conveying.

[0010] Preferably, spiral guide grooves are provided on both sides of the inner wall of the box, and circulation pipes are provided on both sides of the box.

[0011] By adopting the above technical solution, the spiral guide groove on the inner wall of the box can force the incoming cooling water to form turbulence, improve the heat exchange efficiency between the cooling water and the plastic strip, and shorten the cooling time.

[0012] Preferably, the inner wall of the box is provided with four sets of guide rollers, which are arranged alternately. A groove is provided on one side of the inner wall of the box, and a lead screw is provided on the inner wall of the groove. A threaded block is threadedly connected to the surface of the lead screw. A connecting plate is provided on one side of the threaded block. Two sets of guide rollers are provided on one side of the connecting plate. A first drive motor is provided on the top of the cover plate. The other end of the output shaft of the first drive motor is fixedly connected to the shaft end of the lead screw through a rotating shaft.

[0013] By adopting the above technical solution, the four sets of staggered guide rollers can extend the residence time of the plastic strip in the box, allowing the plastic strip to have more time to contact the cooling water and improve the cooling efficiency. By driving the lead screw to rotate through the first drive motor, the threaded block and the connecting plate can be moved, and the position of the two sets of guide rollers can be adjusted. This allows for flexible adaptation according to the different thicknesses of the plastic strip, solving the limitation of traditional cooling devices where the guide rollers are fixed and cannot be adjusted, and can only adapt to a single specification of plastic strip.

[0014] Preferably, a sliding groove is provided on both sides of the inner wall of the groove, and a slider is slidably connected in the sliding groove, and the slider is fixedly connected to one side of the threaded block.

[0015] By adopting the above technical solution, the cooperation between the groove on the inner wall of the groove and the slider can guide and limit the movement of the threaded block, preventing the threaded block from shifting when the screw rotates synchronously with the screw.

[0016] Preferably, a temperature sensor is provided at the bottom of the cover plate, a temperature controller is provided on one side of the box, and a plate heat exchanger is provided on the surface of the circulation pipe. The temperature controller is electrically connected to the temperature sensor and the plate heat exchanger respectively.

[0017] By adopting the above technical solution, the temperature sensor at the bottom of the cover plate can collect the temperature data inside the box in real time, and the plate heat exchanger can control the temperature of the cooling water.

[0018] Preferably, the housing is made of stainless steel, and the housing is double-layered and filled with polyurethane foam.

[0019] By adopting the above technical solutions, the enclosure is made of 304 stainless steel, which has excellent corrosion resistance and structural strength, and can adapt to the environment of long-term immersion in cooling water, avoiding damage to the enclosure due to rust and ensuring the overall service life of the equipment; the polyurethane foam material filled in the double-layer structure has a low thermal conductivity and excellent heat insulation performance, which can significantly reduce the heat loss of cooling water in the enclosure.

[0020] Preferably, the four sets of guide rollers are made of ceramic material, and the rollers are made of stainless steel.

[0021] By adopting the above technical solution, the guide roller is made of ceramic material, which not only has excellent high temperature resistance and can adapt to the high temperature environment when the plastic strip is first extruded, but also has a low coefficient of friction, which can prevent the plastic strip from sticking to the surface of the guide roller under high temperature conditions and reduce damage to the surface of the plastic strip.

[0022] In summary, this application includes at least one of the following beneficial technical effects: This cooling device for a plastic granulator utilizes a frame, two sets of meshing gear rollers, and a second drive motor. The gear meshing ensures synchronous rotation of the two sets of rollers, allowing the plastic strip to enter the cooling zone at a uniform speed. This prevents insufficient cooling due to excessively fast transport and avoids reduced production efficiency due to excessively slow transport. Four sets of staggered guide rollers extend the residence time of the plastic strip within the chamber, allowing for more contact with the cooling water and improving cooling effectiveness. The first drive motor drives a lead screw, which in turn moves a threaded block and a connecting plate, enabling position adjustment of the two sets of guide rollers according to the plastic strip's needs. The different thicknesses can be flexibly adapted, solving the limitations of traditional cooling devices where the guide rollers are fixed and cannot be adjusted, and can only be adapted to a single specification of plastic strip. The temperature sensor at the bottom of the cover can collect the temperature data inside the box in real time, and the plate heat exchanger can control the temperature of the cooling water. The box is made of 304 stainless steel, which has excellent corrosion resistance and structural strength, and can adapt to the environment of long-term immersion in cooling water, avoiding damage to the box due to rust and ensuring the overall service life of the equipment. The double-layer structure is filled with polyurethane foam material, which has a low thermal conductivity and excellent heat insulation performance, which can significantly reduce the heat loss of the cooling water inside the box. Attached Figure Description

[0023] Figure 1 This is a frontal three-dimensional structural diagram of this application; Figure 2This is a schematic diagram of the box structure of this application; Figure 3 This is a structural schematic diagram of the cross-section of the box in this application; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the structure of the guide component in this application.

[0024] In the diagram: 1. Box body; 101. Spiral guide channel; 102. Slide groove; 103. Lead screw; 104. Connecting plate; 105. Threaded block; 106. Groove; 107. Slider; 2. Circulation pipe; 3. Plate heat exchanger; 4. Cover plate; 5. Guide assembly; 501. Frame; 502. Roller; 503. Gear; 504. Second drive motor; 6. Temperature controller; 7. Temperature sensor; 8. Guide roller; 9. First drive motor. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0026] Example 1: A cooling device for a plastic granulator, referring to... Figure 1 The enclosure includes a housing 1, two sets of guide components 5, and a cover plate 4. The cover plate 4 is movably connected to the top of the housing 1 via a hinge. The housing 1 has a double-layer structure. The two sets of guide components 5 are located on the top of the cover plate 4. The cover plate 4 is movably connected to the top of the housing 1 via a hinge, which facilitates opening and closing for maintenance, cleaning, or repair of the interior of the housing 1. It can also close the housing 1 during the cooling process. The housing 1 adopts a double-layer structure, which lays the foundation for subsequent improvement of thermal insulation performance and structural strength.

[0027] Example 2: A cooling device for a plastic granulator, referring to... Figure 3 , Figure 4 and Figure 5The guiding component 5 includes a frame 501. Rollers 502 are installed on both sides of the inner wall of the frame 501. Gears 503 are installed at the other ends of both sets of rollers 502, and the two sets of gears 503 mesh. A second drive motor 504 is installed on one side of the frame 501. The other end of the output shaft of the second drive motor 504 is fixedly connected to the other end of the rollers 502 via a rotating shaft. Through the cooperation of the frame 501, the rollers 502 with the two sets of meshing gears 503, and the second drive motor 504, the meshing of the gears 503 ensures that the two sets of rollers 502 rotate synchronously, allowing the plastic strip to enter the cooling area at a uniform speed. This avoids insufficient cooling due to excessively fast transport and also prevents production efficiency from being affected by excessively slow transport. Spiral guide grooves 101 are opened on both sides of the inner wall of the housing 1, and circulation pipes 2 are installed on both sides of the housing 1. The spiral guide grooves 101 on the inner wall of the housing 1 force the incoming cooling water to form turbulence, improving the heat exchange efficiency between the cooling water and the plastic strip, and shortening the cooling time. The inner wall of the housing 1 is provided with four sets of guide rollers 8, which are arranged in an alternating pattern. A groove 106 is provided on one side of the inner wall of the housing 1. A lead screw 103 is provided on the inner wall of the groove 106. A threaded block 105 is threadedly connected to the surface of the lead screw 103. A connecting plate 104 is provided on one side of the threaded block 105. Two sets of guide rollers 8 are provided on one side of the connecting plate 104. A first drive motor 9 is provided on the top of the cover plate 4. The other end of the output shaft of the first drive motor 9 is fixedly connected to the shaft end of the lead screw 103 through a rotating shaft. The four sets of staggered guide rollers 8 can prolong the residence time of the plastic strip in the housing 1, so that the plastic strip has more time to contact the cooling water and improve the cooling efficiency. By driving the lead screw 103 to rotate through the first drive motor 9, the threaded block 105 and the connecting plate 104 can be moved, and the position of the two sets of guide rollers 8 can be adjusted. It can be flexibly adapted according to the different thicknesses of the plastic strip, which solves the limitation of the guide rollers 8 being fixed and unable to be adjusted in traditional cooling devices and only able to adapt to a single specification of plastic strip.

[0028] Example 3: A cooling device for a plastic granulator, referring to... Figure 2 , Figure 3 and Figure 5Both sides of the inner wall of the groove 106 are provided with sliding grooves 102, and a slider is slidably connected in the sliding groove 102. The slider is fixedly connected to one side of the threaded block 105. The cooperation between the sliding groove 102 and the slider in the inner wall of the groove 106 can guide and limit the movement of the threaded block 105, preventing the threaded block 105 from shifting when the lead screw 103 rotates synchronously with the lead screw 103. A temperature sensor 7 is provided at the bottom of the cover plate 4, and a temperature controller 6 is provided on one side of the box 1. A plate heat exchanger 3 is provided on the surface of the circulation pipe 2. The temperature controller 6 is electrically connected to the temperature sensor 7 and the plate heat exchanger 3 respectively. The temperature sensor 7 at the bottom of the cover plate 4 can collect the temperature data in the box 1 in real time, and the plate heat exchanger 3 can control the temperature of the cooling water. The housing 1 is made of stainless steel and double-layered with polyurethane foam. The housing 1 is made of 304 stainless steel, possessing excellent corrosion resistance and structural strength, capable of withstanding long-term immersion in cooling water, preventing damage from rust and ensuring the overall service life of the equipment. The polyurethane foam filling in the double-layered structure has low thermal conductivity and excellent insulation performance, significantly reducing heat loss from the cooling water inside the housing 1. The four sets of guide rollers 8 are made of ceramic material, while the rollers 502 are made of stainless steel. The ceramic material of the guide rollers 8 not only has excellent high-temperature resistance, adapting to the high-temperature environment when the plastic strip is first extruded, but also has a low coefficient of friction, preventing the plastic strip from sticking to the surface of the guide rollers 8 at high temperatures, reducing surface damage to the plastic strip.

[0029] The implementation principle of this application embodiment is as follows: When using the cooling device of the plastic granulator, an appropriate amount of cooling water is injected into the box 1, and the temperature threshold adapted to the current cooling requirements of the plastic strip is preset by the temperature controller 6. After the preparation work is completed, the equipment is started. After the molten plastic is formed into a strip by the extrusion mechanism, it will first enter the two sets of guide components 5 at the top of the cover plate 4. The second drive motor 504 is started, and its output shaft drives a set of rollers 502 to rotate through the rotating shaft. Since the gears 503 at the other end of the two sets of rollers 502 mesh with each other, the other set of rollers 502 will rotate synchronously in the opposite direction. The two sets of rollers 502 form a stable clamping and conveying force, guiding the plastic strip downward at a uniform speed, ensuring that the plastic strip enters the box 1 in the closed state smoothly. According to the thickness specification of the current plastic strip, the position of the four sets of guide rollers 8 can be adjusted by the first drive motor 9. The output shaft of the first drive motor 9 drives the lead screw 103 in the groove 106 to rotate. The threaded block 105, which is threaded to the lead screw 103, moves smoothly along the axial direction of the lead screw 103 under the guiding and limiting action of the slide groove 102 and the slider. Then, through the continuous The connecting plate 104 drives the two sets of guide rollers 8 to adjust synchronously, so that the spacing of the four sets of staggered guide rollers 8 is adapted to the thickness of the plastic strip. The staggered layout can extend the residence time of the plastic strip in the box 1, allowing the plastic strip to fully contact the cooling water. At the same time, the circulation pipe 2 is activated to realize the circulation flow of cooling water. The circulation pipes 2 on both sides of the box 1 continuously send cooling water into the box 1. The spiral guide grooves 101 on both sides of the inner wall of the box 1 force the cooling water to form turbulence, breaking the thermal resistance boundary layer of traditional laminar flow, and greatly improving the heat exchange efficiency between the cooling water and the surface of the plastic strip. 4. The temperature sensor 7 at the bottom collects the temperature data inside the box 1 in real time and transmits the data to the thermostat 6. If the water temperature deviates from the preset threshold, the thermostat 6 will automatically adjust the plate heat exchanger 3 on the circulation pipe 2 to ensure a stable cooling environment. During this process, the ceramic guide roller 8, with its high temperature resistance and low friction characteristics, prevents the high temperature plastic strip from sticking together and keeps the conveying smooth. The 304 stainless steel box 1 and the polyurethane foam material in the double-layer structure not only prevent the box 1 from rusting due to long-term immersion in cooling water, but also reduce the heat loss inside the box 1.

Claims

1. A cooling device for a plastic granulator, comprising a housing (1), two sets of guide components (5), and a cover plate (4), characterized in that: The cover plate (4) is movably connected to the top of the box body (1) by a hinge. The box body (1) has a double-layer structure, and two sets of the guide components (5) are set on the top of the cover plate (4).

2. The cooling device for a plastic granulator according to claim 1, characterized in that: The guide assembly (5) includes a frame (501), with rollers (502) provided on both sides of the inner wall of the frame (501). Gears (503) are provided at the other ends of the two sets of rollers (502), and the two sets of gears (503) mesh with each other. A second drive motor (504) is provided on one side of the frame (501), and the other end of the output shaft of the second drive motor (504) is fixedly connected to the other end of the rollers (502) through a rotating shaft.

3. The cooling device for a plastic granulator according to claim 2, characterized in that: Spiral guide grooves (101) are provided on both sides of the inner wall of the box (1), and circulation pipes (2) are provided on both sides of the box (1).

4. The cooling device for a plastic granulator according to claim 3, characterized in that: The inner wall of the box (1) is provided with four sets of guide rollers (8), which are arranged in an alternating manner. A groove (106) is provided on one side of the inner wall of the box (1). A lead screw (103) is provided on the inner wall of the groove (106). A threaded block (105) is threadedly connected to the surface of the lead screw (103). A connecting plate (104) is provided on one side of the threaded block (105). Two sets of guide rollers (8) are provided on one side of the connecting plate (104). A first drive motor (9) is provided on the top of the cover plate (4). The other end of the output shaft of the first drive motor (9) is fixedly connected to the shaft end of the lead screw (103) through a rotating shaft.

5. A cooling device for a plastic granulator according to claim 4, characterized in that: The inner wall of the groove (106) is provided with sliding grooves (102) on both sides, and a slider (107) is slidably connected in the sliding groove (102). The slider (107) is fixedly connected to one side of the threaded block (105).

6. A cooling device for a plastic granulator according to claim 5, characterized in that: A temperature sensor (7) is provided at the bottom of the cover plate (4), a temperature controller (6) is provided on one side of the box body (1), and a plate heat exchanger (3) is provided on the surface of the circulation pipe (2). The temperature controller (6) is electrically connected to the temperature sensor (7) and the plate heat exchanger (3) respectively.

7. A cooling device for a plastic granulator according to claim 6, characterized in that: The box body (1) is made of 304 stainless steel and is filled with polyurethane foam material in two layers.

8. A cooling device for a plastic granulator according to claim 4, characterized in that: The four sets of guide rollers (8) are made of ceramic material, and the roller (502) is made of stainless steel.

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