Granulator with cooling function

Abstract

The utility model relates to the technical field of dicing cutters, and discloses a dicing cutter with a cooling function, which comprises a stock cutter, the stock cutter comprises a knife roll used for rotary cutting, two ends of the knife roll are provided with coaxial rotating shafts, the side surface of the knife roll is provided with a plurality of bent cutters, and the cutter roll is provided with a cooling device. A cutting edge is formed at the free end of the cutter; the device is characterized in that a scrap removing and cooling mechanism is arranged on the knife roll; wind power generated by the scrap removing and cooling mechanism can form resistance and prevent scraps from being attached to the cutting edge on one hand, and can cool the cutting edge on the other hand, the cutting edge is prevented from being melted and deformed at the cutting position of the material particles due to the fact that the temperature of the cutting edge is too high, the cutting precision and effect are guaranteed, the durability of the cutting edge can be improved, and therefore the service life of the cutting edge is prolonged. More importantly, wind power is adopted for heat dissipation and scrap removal, and the problem that follow-up screening is affected by water attached to the surfaces of plastic particles is fundamentally solved.

Description

Technical Field

[0001] This utility model belongs to the field of pelletizer technology, specifically relating to a pelletizer with a cooling function. Background Technology

[0002] Plastic pellets are a type of raw material that is transported and processed into shapes in a semi-finished form. Generally, companies use plastic pellets as the raw material when manufacturing plastic products. Plastic pellets are widely used in modern industrial production due to their ease of storage, transportation, and processing. In the production process, the raw materials are typically mixed, then extruded into plastic strips using an extruder. These strips are then transported by conveyor belt to a pelletizer, where they are finally cut into uniformly sized plastic pellets.

[0003] Patent (CN117901186A) discloses an automatic dust removal and cooling structure for a plastic pelletizer rotary cutter, including a cutter shaft and a cutter body. The cutter body is fixedly sleeved on the outside of the cutter shaft. The cutter shaft has an internal cavity, and the cutter body has an internal cavity. Multiple cutter shaft connecting holes are provided through the cutter shaft, and the internal cavity of the cutter shaft and the internal cavity of the cutter body are connected through these connecting holes. Multiple blades arranged in a circumferential array are provided on the outer side of the cutter body, with a groove between each pair of adjacent blades. Its advantages are that the blade body can be cooled by circulating cooling water, thereby reducing the temperature of the blades. Simultaneously, air blowing is achieved through the inertia of the cooling water and the air blowing module, with airflow ejected from the grooves to clean the plastic particles adhering to the blade body. However, it also has the following disadvantages: using water cooling can cause water to adhere to the surface of the plastic particles during pelletizing, making the plastic particles prone to sticking, which is detrimental to subsequent screening and other processes. Summary of the Invention

[0004] In view of this, the purpose of this utility model is to provide a pelletizer with a cooling function to solve the technical problem in the prior art where water cooling causes water to adhere to the surface of plastic particles, thus affecting subsequent screening.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A pelletizer with a cooling function includes a cutting machine, which includes a cutting roller for rotary cutting. The cutting roller has coaxial rotating shafts at both ends. Multiple curved cutting blades are provided on the side of the cutting roller, with cutting edges formed at their free ends. The cutting roller is equipped with a chip removal and cooling mechanism, which includes a cylindrical receiving groove formed within one of the rotating shafts. The receiving groove extends through the entire rotating shaft and into the cutting roller. An air inlet pipe is provided within the receiving groove, and the air inlet pipe is rotatably connected to the rotating shaft and the cutting roller. A dynamic seal is formed between the ends, so that the receiving groove inside the cutter roller is in a closed state. The air inlet pipe is a closed pipe with a blower connected to one end of its opening. Extension blocks are respectively set at both ends of the blade. An air outlet block is set on the outer side of the extension block. The air outlet block is hollow inside. Multiple air holes are opened on the side of the air outlet block facing the blade. An air duct is opened in the cutter roller and the extension block. One end of the air duct is connected to the receiving groove, and the other end of the air duct is connected to the air outlet block. Multiple air outlet holes are opened at the corresponding positions of the air inlet pipe and the air duct.

[0007] Furthermore, the closed end of the other end of the air inlet pipe is located inside the cutter roller and is spaced apart from the bottom of the receiving trough;

[0008] Furthermore, the extension block is in close contact with the blade end face, and the outer side of the extension block coincides with the extension surface of the outer side of the blade.

[0009] Furthermore, the outer diameter of the air inlet pipe is smaller than the inner diameter of the receiving groove, and a bearing is sleeved between the air inlet pipe and the receiving groove, so that the air inlet pipe can be rotatably connected to the rotating shaft and the cutter roller.

[0010] Furthermore, the length of the cutter is less than the length of the cutter roller, and the distance between the two ends of the cutter and the two ends of the cutter roller is the same;

[0011] Furthermore, the top of the casing has an opening with a cover plate at the opening, which allows the opening to be opened and closed. A through hole is opened in the middle of the cover plate, and an exhaust fan is fixedly connected to the through hole.

[0012] Furthermore, a support is provided below the chopper. The support is a rectangular box with a discharge port on the bottom surface of the casing. The chopper and the support are connected through the discharge port. An inclined chute is provided directly below the discharge port. The top of the chute is fixed to the top plate of the support. The chute passes through the side wall of the support and protrudes.

[0013] Furthermore, the chute includes a screening section located inside the support and a dispersion section located outside the support. The screening section has multiple screen holes distributed on its plate surface, and the dispersion section has multiple triangular pyramid-shaped dispersion protrusions distributed on its plate surface. One side of the triangular pyramid protrusion is directly opposite to the sliding direction of the material particles.

[0014] The beneficial effects of this utility model are as follows:

[0015] Compared to existing technologies, the airflow generated by the blower enters the air duct through the air outlet on the air inlet pipe, then flows into the air outlet block, and finally exits through the air outlet. The discharged airflow serves two purposes: firstly, it creates resistance, preventing debris from adhering to the blade; secondly, it cools the blade, preventing it from melting or deforming at the cutting edge due to excessive temperature, thus ensuring cutting accuracy and effectiveness. It also improves the durability of the blade 109, thereby extending its service life. More importantly, using airflow for heat dissipation and debris removal fundamentally solves the problem of water adhering to the surface of plastic granules affecting subsequent screening. Attached Figure Description

[0016] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0017] Figure 1 This is an overall schematic diagram of the pelletizer with cooling function in Embodiment 1 of this utility model;

[0018] Figure 2 This is a cross-sectional view of the pelletizer with cooling function in Embodiment 1 of this utility model;

[0019] Figure 3 for Figure 2 Enlarged view at point A1;

[0020] Figure 4 This is a schematic diagram of the cutter roller and chip removal and cooling mechanism in Embodiment 1 of this utility model;

[0021] Figure 5 for Figure 4 Enlarged view at point A2;

[0022] Figure 6 This is an axial sectional view of the cutter roller and chip removal and cooling mechanism in Embodiment 1 of this utility model;

[0023] Figure 7 for Figure 6 Enlarged view at point A3;

[0024] Figure 8 This is a radial sectional view of the cutter roller and chip removal and cooling mechanism in Embodiment 1 of this utility model;

[0025] Figure 9 for Figure 8 Enlarged view at A4 in the middle.

[0026] The following labels are shown in the attached diagram:

[0027] Pelletizer 1, housing 101, feed inlet 102, first conveyor roller 103, second conveyor roller 104, limit roller 105, cutting table 106, cutter roller 107, cutter 108, blade 109, discharge port 110, rotating shaft 111, cover plate 112, support 2, chute 3, screening section 301, dispersing section 302, chip removal and cooling mechanism 4, receiving tank 401, air inlet pipe 402, air outlet 403, extension block 404, air outlet block 405, air hole 406, air duct 407, blower 408, exhaust fan 5. Detailed Implementation

[0028] Example 1, specifically as follows: Figures 1-9 As shown.

[0029] A pelletizer with a cooling function includes a pelletizer 1 and a support 2 located below the pelletizer 1. The top of the pelletizer 1 is equipped with an exhaust fan 5 to discharge the chips. The pelletizer 1 includes a cutting roller 107 for rotating cutting. The cutting roller 1 is equipped with a chip removal and cooling mechanism 4. The support 2 is equipped with a chute 3 for discharging the material.

[0030] like Figures 1-3 As shown, the cutting machine 1 includes a housing 101. A feed inlet 102 is opened on one side of the housing 101. A first conveying roller 103, a second conveying roller 104, a limiting roller 105, a cutting table 106, and a cutting roller 107 are sequentially arranged in the inlet 102. The first conveying roller 103 rotates under the drive of a first motor (not shown) and transports the material to be cut to the second conveying roller 104. A limiting roller 105 is positioned directly above the second conveying roller 104. A gap is left between the second conveying roller 104 and the limiting roller 105 to form a channel for transporting the material to be cut. It is worth noting that the limiting roller 105 is covered with a rubber layer to prevent damage to the material to be cut. Under the action of the second and third motors (not shown), the limiting roller 105 and the second conveying roller 104 rotate synchronously in opposite directions, thereby transporting the material to be cut to the cutting table 106. The first conveying roller 103, the second conveying roller 104, the limiting roller 105, the cutting table 106, and the blade roller 107 are all existing technologies and will not be described in detail here.

[0031] like Figure 4As shown, multiple curved cutters 108 are evenly spaced along the circumferential direction on the side of the cutter roller 107. The length of the cutter 108 is less than the length of the cutter roller 107, and the distance between the two ends of the cutter 108 and the two ends of the cutter roller 107 is the same. The cutter 108 is welded and fixed to the cutter roller 107. A cutting edge 109 is formed at the free end of the cutter 108. When the cutter 108 rotates to the cutting table 106, the outer side of the cutting edge 109 is perpendicular to the cutting table 106, thereby forming a vertical cut on the material to be cut. The bottom surface of the housing 101 has a discharge port 110, which is directly opposite the cutting table 106 and the cutter roller 107. The pelletizer 1 and the support 2 are connected through the discharge port 110.

[0032] In this embodiment, the support 2 is a rectangular box, and an inclined chute 3 is provided directly below the discharge port 110. The top of the chute 3 is welded and fixed to the top plate of the support 2, and the chute 3 passes through the side wall of the support 2 and protrudes. After the material to be cut is cut by the blade 109, it forms material particles of uniform size. The material particles fall into the chute 3 and slide to the bottom of the chute 3.

[0033] It is worth explaining in detail that, in this embodiment, the chute 3 includes a screening section 301 located inside the support 2 and a dispersing section 302 located outside the support 2. The screening section 301 has a plurality of screen holes evenly distributed on its plate surface. The screen hole diameter is smaller than the size of the material particles. The debris generated during cutting will inevitably fall into the chute 3. The debris is discharged in time through the screen holes to prevent the debris from entering the next process with the material particles. The dispersing section 302 has a plurality of triangular pyramid-shaped dispersing protrusions evenly distributed on its plate surface. One side of the triangular pyramid is directly opposite to the sliding direction of the material particles. During the sliding process, the kinetic energy of the material particles gradually increases. The dispersing protrusions collide with the material particles, thereby dispersing the aggregated material particles, which is convenient for subsequent screening and other processes.

[0034] like Figure 1 The top of the housing 101 has an opening, and a cover plate 112 is provided at the opening to allow the opening to be opened and closed. In this embodiment, the cover plate 112 is rotatably connected to the top surface of the housing 101. A through hole is opened in the middle of the cover plate 112, and an exhaust fan 5 is fixedly connected to the through hole. The debris generated during the pelletizing process is discharged through the through hole under the air force of the exhaust fan 5, preventing a large amount of debris from accumulating or adhering to the inside of the housing 101. In addition, the exhaust fan 5 accelerates the airflow, thereby carrying away heat more quickly and providing a certain cooling effect to the pelletizer 1.

[0035] However, during the cutting process, the blade 109 is subjected to force and friction for a long time, resulting in a high temperature. On the one hand, the material particles melt and deform under the high temperature, resulting in an irregular overall shape. On the other hand, the debris adheres to the blade 109 due to the heat, especially on the outer surface of the blade 109, which leads to a decrease in cutting accuracy and makes it difficult to effectively cut the material. In some cases, the material cannot be cut at all, and the production objective cannot be achieved.

[0036] To address this, a chip removal and cooling mechanism 4 is provided on the cutter roller 1, such as... Figures 4-9 As shown, coaxial rotating shafts 111 are welded to both ends of the cutter roller 107. The cutter roller 107 is rotatably connected to the machine housing 101 through the rotating shafts 111 at both ends. Specifically, shaft holes are opened on the side wall of the machine housing 101, and bearings are fitted between the rotating shafts 111 and the shaft holes. It should be further noted that a fourth motor (not shown in the figure) is connected to one end of the rotating shaft 111, and the output shaft of the fourth motor is connected to the rotating shaft 111 by a coupling.

[0037] The chip removal and cooling mechanism 4 includes a cylindrical receiving groove 401 located within the rotating shaft 111 at the end away from the fourth motor. The axis of the receiving groove 401 coincides with the axis of the rotating shaft 111. The receiving groove 401 extends through the entire rotating shaft 111 and into the cutter roller 107. Notably, the depth of the receiving groove 401 within the cutter roller 107 exceeds the end face of the cutter 108 on the side away from the opening of the receiving groove 401. A coaxial air inlet pipe 402 is provided within the receiving groove 401. The outer diameter of the air inlet pipe 402 is smaller than the inner diameter of the receiving groove 401. A bearing is fitted between the air inlet pipe 402 and the receiving groove 401, thereby enabling a rotatable connection between the air inlet pipe 402 and the rotating shaft 111 and the cutter roller 107. Notably, a dynamic seal is formed between the end of the air inlet pipe 402 and the cutter roller 107, keeping the receiving groove 401 within the cutter roller 107 in a closed state.

[0038] The air inlet pipe 402 is a closed pipe, with one open end extending out of the outer wall of the housing 101 and connected to a blower 408. The closed end of the other end of the air inlet pipe 402 is located inside the cutter roller 107 and is spaced apart from the bottom of the receiving groove 401. Extension blocks 404 are respectively provided at both ends of the blade 109. The extension blocks 404 are in close contact with the end face of the blade 109, and the outer surface of the extension blocks 404 coincides with the extension surface of the outer surface of the blade 109. An air outlet block 405 is welded to the outer surface of the extension blocks 404. The air outlet block 405 is hollow, forming a cavity, and multiple air holes 406 are opened on the side of the air outlet block 405 facing the blade 109.

[0039] An air duct 407 is provided inside the cutter roller 107 and the extension block 404. One end of the air duct 407 is connected to the receiving groove 401, and the other end of the air duct 407 is connected to the air outlet block 405. Multiple air outlet holes 403 are provided along the circumferential direction at the positions corresponding to the air duct 407 on the air inlet pipe 402, and the air outlet holes 403 correspond one-to-one with the air duct 407.

[0040] In operation, the airflow generated by the blower 408 enters the air duct 407 through the air outlet 403 on the air inlet pipe 402, then enters the air outlet block 405 through the air duct 407, and finally exits through the air outlet 406. The discharged airflow serves two purposes: firstly, it creates resistance to prevent debris from adhering to the blade 109; secondly, it cools the blade 109, preventing it from melting or deforming at the cutting edge of the material particles due to excessive temperature, thus ensuring cutting accuracy and effect, and improving the durability of the blade 109, thereby extending its service life. More importantly, using airflow for heat dissipation and debris removal fundamentally solves the problem of water adhering to the surface of plastic particles affecting subsequent screening.

[0041] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A cutting machine with cooling function, comprising a cutting machine, the cutting machine comprising a knife roller for rotary cutting, both ends of the knife roller being provided with shafts coaxial with each other, a plurality of curved cutters are arranged on the side surface of the knife roller, and a cutting edge is formed at the free end of each cutter; characterized in that, The knife roller is provided with a chip removal cooling mechanism, which comprises a cylindrical accommodating groove formed in one end of the rotating shaft, the accommodating groove extending through the entire rotating shaft and into the knife roller, an air inlet pipe arranged in the accommodating groove, the air inlet pipe being rotatably connected between the rotating shaft and the knife roller, a dynamic seal being formed between the air inlet pipe and the end of the knife roller, so that the accommodating groove in the knife roller is in a closed state, the air inlet pipe being a closed pipe, one end of which is connected with a blower, the two ends of the knife edge being respectively provided with an extension block, the outer side surface of the extension block being provided with an air outlet block, the air outlet block being hollow inside, a plurality of air holes being formed in the side surface of the air outlet block facing the knife edge, an air duct being formed in the knife roller and the extension block, one end of the air duct being in communication with the accommodating groove, the other end of the air duct being in communication with the air outlet block, a plurality of air outlet holes being formed in the air inlet pipe at positions corresponding to the air duct.

2. The pelletizer with a cooling function according to claim 1, characterized in that, The closed end of the other end of the air inlet pipe is located in the knife roller and spaced from the bottom of the accommodating groove.

3. The pelletizer with a cooling function according to claim 2, characterized in that, The extension block is tightly attached to the end surface of the knife edge, and the outer side surface of the extension block coincides with the extension surface of the outer side surface of the knife edge.

4. The pelletizer with a cooling function according to claim 3, characterized in that, The outer diameter of the air inlet pipe is smaller than the inner diameter of the accommodating groove, and a bearing is arranged between the air inlet pipe and the accommodating groove, so that the air inlet pipe is rotatably connected between the rotating shaft and the knife roller.

5. The pelletizer with cooling function according to claim 4, characterized in that, The length of the cutter is smaller than the length of the knife roller, and the distance between the two ends of the cutter is the same as the distance between the two ends of the knife roller.

6. The pelletizer with a cooling function according to claim 1 or 5, characterized in that, The top of the casing is provided with an opening, and a cover plate is arranged at the opening to open and close the opening, a through hole is formed in the middle of the cover plate, and an air extractor is fixedly connected to the through hole.

7. The pelletizer with cooling function according to claim 1, characterized in that, A support is arranged below the cutter, the support being a rectangular box, and a discharge port is formed in the bottom surface of the casing, the cutter being in communication with the support through the discharge port, and an inclined chute is arranged directly below the discharge port, the top end of the chute being fixed to the top plate of the support, and the chute penetrating through the side wall of the support and being exposed.

8. The pelletizer with a cooling function according to claim 7, characterized in that, The chute comprises a screening section arranged inside the support and a dispersion section arranged outside the support, a plurality of screen holes are distributed on the plate surface of the screening section, and a plurality of triangular pyramid-shaped dispersion protrusions are distributed on the plate surface of the dispersion section, and one side of the triangular pyramid protrusion is opposite to the sliding direction of the material particles.

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