Low-temperature granulator

Abstract

The utility model relates to a granulator, in particular to a low-temperature granulator, which comprises a charging barrel and a cutting bin, an extrusion screw is arranged in the charging barrel, the charging barrel is provided with a feeding section and a discharging section, the feeding section is provided with a feeding port, the discharging section is provided with an extrusion port, the extrusion screw is connected with the feeding port and the extrusion port, and a discharging die head is arranged at the extrusion port. The cutting machine further comprises an outer cooling device and an inner cooling device, the inner cooling device comprises a temperature sensor and a fan, the temperature sensor extends into the discharging section, an air outlet of the fan is aligned with the charging barrel, and the outer cooling device comprises a fan communicated with the cutting bin. An extrusion cavity with the thickness not larger than 2.5 mm is formed between the front end extrusion face of the extrusion screw and the inner wall of the discharging die head, the outer cooling device and the inner cooling device are matched to enable materials in the extrusion cavity to be smoothly extruded out and rapidly shaped, the thickness of the extrusion cavity is not larger than 2.5 mm, and the starting speed is guaranteed.

Description

Technical Field

[0001] The utility model relates to a granulator, in particular to a low-temperature granulator. Background Art

[0002] Low-temperature environmentally friendly granulator is a kind of equipment specially designed for recycling and reusing plastic materials at a relatively low temperature. It can avoid high temperature from damaging the material properties and reduce the generation of harmful gases. During the working process, the screw rotates to transport the plastic material. During the transportation process, the plastic material is melted by friction and heat, and is extruded under pressure at the discharge die. The plastic material is overheated before extrusion. Too high temperature will increase the fluidity of the plastic material and reduce the viscosity. If it is extruded too quickly, the extruded plastic particles will cool down slowly, have low density and poor quality. Utility Model Content

[0003] In view of the technical problems existing in the background technology, the utility model aims to provide a low-temperature granulator, which controls the temperature of the discharge section of the barrel to ensure the density of plastic particles, designs the extrusion cavity to provide flow space, and sets the maximum thickness to ensure the start-up speed.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions: the low-temperature granulator comprises a barrel and a cutting bin, the barrel is provided with an extrusion screw, the barrel has an inlet section and a discharge section, the inlet section is provided with a feeding port, the discharge section is provided with an extrusion port, the extrusion screw connects the feeding port and the extrusion port, the extrusion port is provided with a discharge die head, the discharge die head is provided with extrusion holes, the cutting bin is arranged at the discharge die head, the cutting bin is provided with a cutting component, the cutting component cooperates with the discharge die head, and further comprises a continuous An external cooling device is provided for operation and an internal cooling device is provided for operation when the set temperature value is reached, the internal cooling device comprises a temperature sensor connected to the controller and a fan connected to the controller, the temperature sensor extends into the discharge section, the air outlet of the fan is aligned with the barrel, the external cooling device comprises a fan connected to the cutting bin, an extrusion cavity with a thickness not greater than 2.5 mm is provided between the front end extrusion surface of the extrusion screw and the inner wall of the discharge die head, the mutual cooperation between the external cooling device and the internal cooling device enables the material in the extrusion cavity to be extruded smoothly and quickly shaped.

[0005] In this solution, the controller controls the operation of the internal cooling device according to the signal of the temperature sensor. The air outlet of the fan cools the discharge section of the barrel and pre-cools the plastic material in the discharge section of the barrel. After extrusion molding, the airflow formed by the fan cools the plastic particles again, and the molding is fast to ensure product quality. An extrusion cavity is set between the extrusion surface at the front end of the extrusion screw and the inner wall of the discharge die head for material flow. The thickness of the extrusion cavity is not more than 2.5 mm, which can not only ensure the flow space of the material before extrusion, but also control the amount of residual material in the discharge section, avoid excessive amount of material that needs to be heated in the barrel when starting up, and ensure the startup speed.

[0006] Preferably, the cutting bin has a discharge port, and the discharge port is connected to the air suction port of the fan.

[0007] In this solution, the airflow flows through the discharge port of the cutting bin to the air suction port, taking away the heat of the plastic particles in the cutting bin and driving the plastic particles to leave the cutting bin from the discharge port, which can both cool and feed the materials.

[0008] Preferably, the discharge port is connected to a discharge channel, the discharge channel is connected to an air suction port of a fan, the discharge channel has a drop port, a material barrel is provided below the drop port, and the material barrel is connected to a film making device.

[0009] In this solution, the plastic particles in the cutting bin fall from the discharge port into the barrel through the discharge channel, and the barrel supplies the film making equipment for online use.

[0010] Preferably, the discharge channel is also connected to the air outlet of the fan, and the air outlet of the fan is located behind the air suction port of the fan along the material conveying direction.

[0011] In this solution, the air outlet of the fan blows air into the discharge channel for pushing the material, and the plastic particles are transported in the discharge channel by suction and blowing.

[0012] Preferably, the cutting assembly comprises a mounting head and a scraper, the mounting head is rotatably disposed in the cutting bin, the scraper is disposed on the mounting head, and the blade of the scraper abuts against the surface of the discharge die head.

[0013] In this solution, the rotation of the mounting head drives the scraper blade to move along the surface of the discharge die head, and the scraper blade cuts the extruded strip through the extrusion hole to form plastic particles.

[0014] Preferably, the scraper is arranged along the circumference of the mounting head.

[0015] In this solution, the length of the plastic particles can be controlled by adjusting the distance between adjacent scrapers.

[0016] Preferably, the cutting bin is provided with an upward opening, and the opening is provided with a glass plate.

[0017] In this solution, the glass plate forms a visual window for the operator to observe the cutting conditions in the cutting bin.

[0018] Preferably, a feeding head with a power source is provided at a position corresponding to the feeding port, and the feeding head moves up and down to insert the end of the strip material into the extrusion screw. The feeding head is equipped with a material introduction device, and the material introduction device includes a feeding roller. The feeding roller continuously rotates to feed the material and the feeding head continuously plugs the material to form a feeding device. The feeding device, the internal cooling device and the external cooling device work together normally to ensure the density of the material.

[0019] In this solution, the feeding head moves up and down to insert the end of the strip material into the extrusion screw to ensure uniform feeding. Uniform feeding makes the friction heat generation stable, the internal cooling device works at a stable interval and in an orderly manner, and the feeding roller actively pulls the strip material, which can be granulated online.

[0020] Preferably, the feeding port is equipped with a feeding bin, and the feeding bin is provided with a feeding port, and negative pressure is formed at the feeding port after the feeding bin is connected to a fan.

[0021] In this solution, the airflow generated by the fan creates negative pressure at the feed inlet to suck the strip materials into the feeding bin, which can adapt to high-speed online recovery.

[0022] Preferably, after the feeding bin is connected to the air outlet of the fan, an air supply channel is formed in the feeding bin, the feed port is connected to the air supply channel, and the air outlet of the fan is located before the feed port along the flow direction of the airflow in the air supply channel.

[0023] In this solution, the air outlet of the fan blows air to form an air supply channel in the feeding bin, and the material is sucked in by negative pressure and continuously transported by the air flow.

[0024] Preferably, the air supply channel is connected to an air suction port of a fan, and the air suction port of the fan is located behind the feed port along the flow direction of the airflow in the air supply channel.

[0025] In this solution, the fan sucks air to form negative pressure, which can produce a downward pulling force on the material, and cooperate with the air supply to form an air circulation, which can not only smoothly deliver the material to the extrusion screw, but also prevent the air flow from entering the feeding port and affecting the product quality.

[0026] The beneficial effects of the utility model are as follows: the controller controls the operation of the internal cooling device according to the signal of the temperature sensor, the air outlet of the fan cools the discharge section of the barrel, and pre-cools the plastic material in the discharge section of the barrel. After extrusion molding, the airflow formed by the fan operation cools the plastic particles again, and the molding is fast, and the product quality is guaranteed. An extrusion cavity is set between the extrusion surface at the front end of the extrusion screw and the inner wall of the discharge die head for the material to flow. The thickness of the extrusion cavity is not more than 2.5 mm, which can not only ensure the flow space of the material before extrusion, but also control the amount of the material remaining in the discharge section, avoid excessive amount of material that needs to be heated in the barrel when starting up, and ensure the startup speed. Therefore, compared with the prior art, the utility model has substantial characteristics and progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following describes the relevant details and working principles of the implementation methods and embodiments of the present utility model in conjunction with the accompanying drawings.

[0028] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0029] Figure 2 It is a cross-sectional view of the utility model.

[0030] Figure 3 for Figure 2 A is an enlarged view of the middle image.

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure inside the cutting bin of the utility model.

[0032] Figure 5 It is a three-dimensional structural schematic diagram of the material introduction device in the utility model.

[0033] In the figure: 1. barrel; 2. feeding section; 3. discharging section; 4. discharging die head; 5. extrusion hole; 6. cutting bin; 7. cutting assembly; 8. internal cooling device; 9. external cooling device; 10. mounting head; 11. scraper; 12. extrusion screw; 13. extrusion cavity; 15. material introduction device; 16. feeding roller; 17. discharging port; 21. hopper. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the implementation of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field without making creative work based on the embodiments of the utility model are within the scope of protection of the utility model.

[0035] In the description of the present application, it should be understood that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0037] See attached Figure 1-4 In an example of the present embodiment, a low-temperature granulator comprises a barrel 1 and a cutting bin 6, an extrusion screw 12 is arranged in the barrel 1, the barrel 1 has an inlet section 2 and an outlet section 3, the inlet section 2 is provided with a feeding port, the outlet section 3 is provided with an extrusion port, the extrusion screw 12 connects the feeding port and the extrusion port, a discharge die 4 is arranged at the extrusion port, extrusion holes 5 are distributed on the discharge die 4, the cutting bin 6 is arranged at the discharge die 4, a cutting assembly 7 is arranged in the cutting bin 6, the cutting assembly 7 comprises a mounting head 10 and a scraper 11, the mounting head 10 is rotatably arranged in the cutting bin 6, the scraper 11 is arranged along the circumference of the mounting head 10, and the blade of the scraper 11 abuts against the surface of the discharge die 4.

[0038] Among them, it also includes an external cooling device 9 that works continuously and an internal cooling device 8 that works only when the set temperature value is reached. The internal cooling device 8 includes a temperature sensor connected to the controller and a fan connected to the controller. The temperature sensor extends into the discharge section 3, and the air outlet of the fan is aligned with the barrel 1. The external cooling device 9 includes a fan 9 connected to the cutting bin 6. An extrusion cavity 13 with a thickness of no more than 2.5 mm is provided between the front end extrusion surface of the extrusion screw 12 and the inner wall of the discharge die 4. The mutual cooperation between the external cooling device 9 and the internal cooling device 8 enables the material in the extrusion cavity 13 to be extruded smoothly and quickly shaped.

[0039] In this embodiment, the plastic material enters the barrel 1 from the feeding port, and the extrusion screw 12 rotates to transport the plastic material from the feeding section 2 to the extrusion cavity 13 of the discharging section 3, and then extrudes from the extrusion hole 5 of the discharging die head 4. The installation head 10 rotates to drive the scraper 11 to cut the extruded strip plastic material with a blade to form plastic particles. The fan drives the air flow to take away the heat on the plastic particles, so that the plastic particles are cooled and shaped. The plastic material can be collected production waste or waste generated by online production of plastic product production equipment; the fans of the internal and external cooling devices can be the same or different, and the air outlet and air intake of the fan are not limited to the air outlet and air intake of the fan itself, but also include the air intake and air outlet extended by the extension of the pipeline, which are controlled by a temperature sensor (not shown in the figure) The temperature of the discharge section 3 is monitored. When the controller (not shown in the figure) determines that the temperature signal value is too high, it drives the internal cooling device 8 to work. After the temperature signal value drops, the controller controls the internal cooling device 8 to stop, and controls the temperature of the discharge section 3 to be optimal within a range. The connection between the controller and the fan and the temperature sensor is not limited to electrical connection and wireless communication signal connection, as long as the signal transmission can be completed; the setting of the extrusion cavity 13 makes the molten plastic material not flow out so quickly, and can also slightly extend the pre-cooling time of the molten plastic material in the discharge section 3; adjusting the distance between adjacent scrapers 11 can control the length of the plastic particles, and the scraper 11 is tilted relative to the discharge die 4, which can reduce the contact area between the two and reduce friction; the molded plastic particles can be directly used for online production of plastic product production equipment, or can be collected.

[0040] See attached Figure 1 The cutting bin 6 has a discharge port 17, and the discharge port 17 is connected to a discharge channel. The discharge channel is connected to the air suction port of the fan and the air outlet of the fan. The air outlet of the fan is located behind the air suction port of the fan along the material conveying direction. The discharge channel has a blanking port, and a material barrel is provided below the blanking port. The material barrel is connected to a film making device. The cutting bin 6 is provided with an upward opening, and the opening is equipped with a glass plate.

[0041] In the present embodiment, the plastic particles formed in the cutting bin 6 fall from the drop port (a hopper 21 is shown in the figure) through the discharge channel into the material barrel, and the material barrel is used to supply plastic product production equipment such as film making equipment, and is used online, wherein the fan sucks the plastic particles into the discharge channel by suction, which can both cool and suck the material, and the fan blows an airflow for pushing the material into the discharge channel through the blowing port, and the plastic particles are transported in the discharge channel by suction and blowing. The connection between the two can rely on gravity or on the negative pressure generated by the blowing, so that there is an airflow flowing toward the blowing port of the fan, driving the plastic particles to move. The fan can be used as a part of the discharge channel, and a mesh can be set at the suction port to block the plastic particles; the glass plate forms a visual window for the operator to observe the cutting situation in the cutting bin 6.

[0042] In other alternative embodiments, the conveying method can also be changed to a blowing and sucking method. The blowing port of the fan is arranged in the cutting bin 6, and a guide plate is arranged to cooperate with the bin wall of the cutting bin 6 to guide the airflow. The airflow forms a specific path to continuously push the plastic particles. The suction port is arranged in the discharge channel to suck the plastic particles in the discharge channel to a specific position, and then discharge the particles by gravity. The fans corresponding to the blowing port and the outlet may be the same or different, and the material barrel may not be connected to the plastic product production equipment, but is only used to collect plastic particles.

[0043] See attached Figure 5 A feeding head with a power source is provided at the corresponding position of the feeding port. The feeding head moves up and down to insert the end of the strip material into the extrusion screw 12. The feeding head is equipped with a material introduction device 15. The material introduction device 15 includes a feeding roller 16. The feeding roller 16 continuously rotates to feed the material and the feeding head continuously plugs the material to form a feeding device. The feeding device, the internal cooling device 8 and the external cooling device 9 work together normally to ensure the density of the material.

[0044] In this embodiment, the feeding roller 16 actively pulls the strip plastic material to the feeding port, and the feeding head moves up and down to insert the delivered strip plastic material into the extrusion screw 12. The feeding roller 16 is equipped with a pressure wheel for stable traction, and is connected to the trimming device of the film making equipment to enable online granulation. The uniform feeding makes the friction heat generation stable, and the internal cooling device 8 works in an orderly manner at intervals to ensure the stable quality of the extruded plastic particles.

[0045] In another embodiment, the feeding port is equipped with a feeding bin, and the feeding bin is provided with a feed port. When the feeding bin is connected to the air outlet of the fan, an air supply channel is formed in the feeding bin, and the feed port is connected to the air supply channel. When the feeding bin is connected to the fan, a negative pressure is formed at the feeding port. Along the flow direction of the airflow in the air supply channel, the air outlet of the fan is located before the feeding port. The air supply channel is connected to the air suction port of the fan, and along the flow direction of the airflow in the air supply channel, the air suction port of the fan is located after the feeding port.

[0046] In this embodiment, negative pressure is a relative pressure that is a negative value. For the feed port, the pressure in the feeding bin is lower than the pressure in the feeding bin. The airflow flows from outside the feeding bin to inside the feeding bin, bringing the strip material into the feeding bin. The feeding bin is connected by blowing and pulling to complete the material transportation, and an airflow circulation can be formed to avoid the airflow entering the feeding port and affecting the product quality. Among them, the fan connected to the air inlet and the fan of the internal and external cooling device can be the same or different.

[0047] The above is a preferred embodiment of the utility model, and it should be noted that the protection scope of the utility model is not limited thereto. For those skilled in the art, without departing from the equivalent inventive concept of the technical scope disclosed by the utility model, several improvements and modifications or equivalent substitutions can be made, which are also regarded as the protection scope of the utility model.

Claims

1. A low temperature granulator, comprising A barrel (1) is provided with an extrusion screw (12) therein, the barrel (1) having an inlet section (2) and an outlet section (3), the inlet section (2) being provided with a feeding port, the outlet section (3) being provided with an extrusion port, the extrusion screw (12) connecting the feeding port and the extrusion port, the extrusion port being provided with an outlet die (4), and the outlet die (4) being provided with extrusion holes (5); A cutting bin (6) is arranged at the discharge die head (4), a cutting assembly (7) is arranged in the cutting bin (6), and the cutting assembly (7) cooperates with the discharge die head (4); Features: It also includes an external cooling device (9) that operates continuously and an internal cooling device (8) that operates only after reaching a set temperature value. The internal cooling device (8) comprises: a temperature sensor connected to the controller, the temperature sensor extending into the discharge section (3), a fan connected to the controller, the air outlet of the fan aimed at the barrel (1); The external cooling device (9) comprises a fan connected to the cutting bin (6); An extrusion cavity (13) having a thickness not greater than 2.5 mm is provided between the front extrusion surface of the extrusion screw (12) and the inner wall of the discharge die head (4), and the cooperation between the external cooling device (9) and the internal cooling device (8) enables the material in the extrusion cavity (13) to be extruded smoothly and shaped quickly.

2. A low temperature granulator as claimed in claim 1, characterized in that: The cutting bin (6) has a discharge port (17), and the discharge port (17) is connected to the air suction port of the fan.

3. A low temperature granulator as claimed in claim 2, characterized in that: The discharge port (17) is connected to a discharge channel, the discharge channel is connected to the air suction port of the fan, the discharge channel has a drop port, a material barrel is arranged below the drop port, and the material barrel is connected to a film making device.

4. A low temperature granulator as claimed in claim 3, characterized in that: The discharge channel is also connected to the air outlet of the fan, and the air outlet of the fan is located behind the air suction port of the fan along the material conveying direction.

5. A low temperature granulator as claimed in claim 1, characterized in that: The cutting component (7) comprises A mounting head (10) rotatably disposed in the cutting bin (6); A scraper (11) is arranged on the mounting head (10), and a blade of the scraper (11) abuts against a surface of the discharge die head (4).

6. A low temperature granulator as claimed in claim 5, characterized in that: The scraper (11) is arranged along the circumference of the mounting head (10).

7. A low temperature granulator as claimed in claim 1, characterized in that: The cutting bin (6) is provided with an upward opening, and the opening is provided with a glass plate.

8. A low temperature granulator as claimed in claim 1, characterized in that: A feeding head with a power source is provided at a position corresponding to the feeding port. The feeding head moves up and down to insert the end of the strip material into the extrusion screw (12). The feeding head is equipped with a material introduction device. The material introduction device (15) includes a feeding roller (16). The feeding roller (16) continuously rotates to feed the material and the feeding head continuously inserts the material to form a feeding device. The feeding device, the internal cooling device (8) and the external cooling device (9) work together normally to ensure the density of the material.

9. A low temperature granulator as claimed in claim 1, characterized in that: The feeding port is equipped with a feeding bin, and the feeding bin is provided with a feeding port. After the feeding bin is connected with a fan, negative pressure is formed at the feeding port.

10. A low temperature granulator as claimed in claim 9, characterized in that: After the feeding bin is connected to the air outlet of the fan, an air supply channel is formed in the feeding bin, the feed port is connected to the air supply channel, and the air outlet of the fan is located before the feed port along the flow direction of the airflow in the air supply channel.

11. A low temperature granulator as claimed in claim 10, characterized in that: The air supply channel is connected to an air suction port of a fan, and the air suction port of the fan is located behind the feed port along the flow direction of the airflow in the air supply channel.

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