Granulator and control method thereof

Abstract

According to the pelletizer and the control method thereof, a sensor is arranged between a screen exchanger and a frame body and can detect the pressure applied to the screen exchanger by plastic, due to the fact that the sensor is electrically connected with a first driver, when the sensor detects that the pressure is increased, the plastic output speed of a die head is increased, and the plastic output speed of the die head is increased; when the sensor detects that the pressure is reduced, the first driver drives the tool bit to rotate at a high speed, so that the volume of particles cut by the tool bit is kept within a certain range, and when the sensor detects that the pressure is reduced, the plastic output speed of the die head is reduced, and the rotation speed of the tool bit driven by the first driver is reduced, so that the volume of the particles cut by the tool bit is kept within a certain range; furthermore, in the pelletizer, the pressure between the screen changer and the frame body is detected through the sensor, so that the first driver can adjust the rotating speed of the tool bit according to the pressure detected by the sensor, and the size of particles cut by the tool bit is kept within a certain range.

Description

Technical Field

[0001] The invention relates to the technical field of plastic processing equipment, and in particular to a granulator and a control method thereof. Background Art

[0002] With the widespread use of plastic products, more and more plastic waste is generated. In order to reduce the pollution of plastic waste to the environment, people use granulators to recycle plastic waste for secondary use.

[0003] In the related art, a granulator compresses and melts the plastic. The melted plastic is filtered through a screen changer and then output through a die. The output long strips of plastic need to be cut with a tool to form particles.

[0004] However, since the speed at which the die outputs plastic is constantly changing, the sizes of the particles cut off by the tool vary. Summary of the invention

[0005] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art. The first aspect of the present invention provides a granulator. The size of the particles produced by the granulator of this embodiment is more uniform. The second aspect of the present invention also provides a control method.

[0006] According to the first aspect of the present invention, a granulator is provided, which includes a frame, a melting module, a filtering module, a die head and a pelletizing module; the melting module is arranged on the frame and is used for melting plastic; the filtering module is arranged on the frame, the filtering module includes a screen changer and a sensor, the screen changer is used for filtering the molten plastic, the sensor is arranged between the screen changer and the frame, and is used for detecting the pressure applied by the plastic to the screen changer; the die head is arranged on the frame and is located on the side of the screen changer away from the melting module, the die head is used for outputting the plastic filtered by the screen changer; the pelletizing module is arranged on the frame, the pelletizing module includes a first driver and a cutter head, the cutter head is arranged on one side of the die head, the first driver is connected to the cutter head, and is electrically connected to the sensor, the first driver can drive the cutter head to rotate to cut the plastic output by the die head to form particles, and the greater the pressure value detected by the sensor, the greater the speed at which the first driver drives the cutter head to rotate.

[0007] The granulator described in the present invention has at least the following beneficial effects: in the granulator of the present application, the sensor is arranged between the screen changer and the frame, and can detect the pressure applied by the plastic to the screen changer. Since the sensor is electrically connected to the first driver, when the sensor detects that the pressure increases, the speed at which the die head outputs the plastic becomes faster, and the first driver drives the cutter head to rotate faster, so that the volume of the particles cut by the cutter head remains within a certain range. When the sensor detects that the pressure decreases, the speed at which the die head outputs the plastic becomes slower, and the first driver drives the cutter head to rotate slower, so that the volume of the particles cut by the cutter head remains within a certain range. Furthermore, in the granulator of the present application, the pressure between the screen changer and the frame is detected by the sensor, so that the first driver can adjust the rotation speed of the cutter head according to the pressure detected by the sensor, thereby keeping the size of the particles cut by the cutter head within a certain range.

[0008] According to the granulator described in the embodiment of the first aspect of the present invention, a pelletizing cavity is formed in the frame, the die head and the knife head are both arranged in the pelletizing cavity, and the lower end of the pelletizing cavity is connected to a discharge channel, which is used to discharge the particles in the pelletizing cavity.

[0009] According to the granulator described in the embodiment of the first aspect of the present invention, the cavity wall of the pelletizing cavity is provided with a cavity opening connected to the pelletizing cavity, the cavity opening is provided with a cavity door for closing the cavity opening, and the first driver is arranged on the cavity door.

[0010] According to the granulator described in the embodiment of the first aspect of the present invention, a protective member is movably provided on the chamber door. Under the action of external force, the protective member can switch between an avoidance state and a protection state. When the protective member is in the protection state, the protective member cooperates with the chamber door to wrap the cutting head. When the protective member is in the avoidance state, the protective member opens the wrapped cutting head.

[0011] According to the granulator described in the embodiment of the first aspect of the present invention, the protective member is hinged to the outer surface of the chamber door.

[0012] According to the granulator described in the embodiment of the first aspect of the present invention, one end of the chamber door is hinged to the edge of the chamber opening, and the other end of the chamber door is detachably connected to the edge of the chamber opening through a connecting assembly.

[0013] According to the granulator described in the embodiment of the first aspect of the present invention, the connecting assembly includes a handle, a locking sleeve and a lock buckle. The handle is hinged to the edge of the cavity opening, one end of the locking sleeve is hinged to the handle, and the other end of the locking sleeve can be movably mounted on the lock buckle. The lock buckle is installed on the cavity door. Under the action of external force, the handle can rotate relative to the edge of the cavity opening to tighten or loosen the lock buckle.

[0014] The granulator according to the embodiment of the first aspect of the present invention further includes a feeding module. The feeding module includes a second driver and a feeding screw. One end of the feeding screw faces the melting module. The second driver is connected to the feeding screw and is used to drive the feeding screw to rotate so as to convey the plastic to the melting module.

[0015] For the granulator according to the embodiment of the first aspect of the present invention, the feeding screw includes a plurality of thread segments; the feeding module further includes a cutting structure. The cutting structure is arranged between two adjacent thread segments and is used to cut the plastic on the feeding screw.

[0016] The control method according to the embodiment of the second aspect of the present invention is used to control the granulator provided by the embodiment of the first aspect of the present invention. The control method includes the following steps:

[0017] Continuously obtain the pressure detected by the sensor;

[0018] Judge whether the pressure detected by the sensor increases or decreases, and correspondingly increase or decrease the rotation speed of the cutter head.

[0019] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0020] The present invention will be further described below in conjunction with the drawings and embodiments;

[0021] Figure 1 It is a schematic structural diagram of the granulator when the cavity door is in the closed state in an embodiment of the present invention;

[0022] Figure 2 is Figure 1 A partial enlarged view of the structure at A of the shown granulator;

[0023] Figure 3 It is a schematic structural diagram of the granulator when the cavity door is in the open state in an embodiment of the present invention;

[0024] Figure 4 is Figure 3 A partial enlarged view of the structure at B of the shown granulator;

[0025] Figure 5 It is a schematic structural diagram of the melting module, filtering module, die head and feeding module in an embodiment of the present invention;

[0026] Figure 6 is Figure 5 A partial enlarged view of the structure at C in the shown structure;

[0027] Figure 7 It is a schematic structural diagram of the cooling module in an embodiment of the present invention

[0028] Figure 8 Flow chart of the control method according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] Frame body 100; pelletizing cavity 101; cavity door 110; protective member 120; connection assembly 130; handle 131; lock sleeve 132; lock catch 133;

[0031] Melting module 200; tapered flange sleeve 210; flange long sleeve 220;

[0032] Filter module 300; screen changer 310;

[0033] Die head 400;

[0034] Pelletizing module 500; first driver 510; cutter head 520;

[0035] Feeding module 600; second driver 610; feeding screw 620; threaded section 621; cutting structure 630;

[0036] Feeding hopper 700;

[0037] Cooling module 800; fan 810; air guiding structure 820; air guiding channel 821; air inlet 821a; air outlet 821b. Detailed implementation manners

[0038] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to visually and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be construed as a limitation on the protection scope of the present invention.

[0039] In the description of the present invention, it should be understood that for the orientation description, such as up, down, front, back, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 cannot be construed as a limitation on the present invention.

[0040] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the present number, and "above", "below", "within", etc. are understood as including the present number. If there is a description of "first", "second", it is only for the purpose of distinguishing technical features and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0041] In the description of the present invention, unless otherwise clearly defined, terms such as "setting", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0042] The following refers to Figures 1 to 7 to describe the granulator according to the first aspect of the present application in detail.

[0043] Referring to Figure 1 , Figure 2 and Figure 5 , the granulator according to an embodiment of the present invention includes a frame 100, a melting module 200, a filtering module 300, a die head 400, and a pelletizing module 500; the melting module 200 is arranged on the frame 100 and is used for melting plastics; the filtering module 300 is arranged on the frame 100, the filtering module 300 includes a screen changer 310 and a sensor, the screen changer 310 is used for filtering the melted plastics, and the sensor is arranged between the screen changer 310 and the frame 100 and is used for detecting the pressure exerted by the plastics on the screen changer 310; the die head 400 is arranged on the frame 100 and is located on the side of the screen changer 310 away from the melting module 200, and the die head 400 is used for outputting the plastics filtered by the screen changer 310; the pelletizing module 500 is arranged on the frame 100, the pelletizing module 500 includes a first driver 510 and a cutter head 520, the cutter head 520 is arranged on one side of the die head 400, the first driver 510 is connected to the cutter head 520 and is electrically connected to the sensor, the first driver 510 can drive the cutter head 520 to rotate to cut the plastics output by the die head 400 into particles, and the greater the pressure value detected by the sensor, the greater the rotation speed of the first driver 510 driving the cutter head 520.

[0044] It should be noted that when the granulator of the present application is working, after the plastics are fed into the melting module 200, the melting module 200 can melt the plastics, and the melted plastics are transported into the filtering module 300 and filtered under the action of the screen changer 310 to remove impurities in the plastics. The filtered plastics are output by the die head 400, and the plastics output by the die head 400 are in a strip shape. During the process of the die head 400 outputting plastics, the first driver 510 drives the cutter head 520 to rotate to cut the plastics output by the die head 400 into particles.

[0045] It should be noted that when the amount of plastic passing through the screen changer 310 increases, at this time, the pressure between the screen changer 310 and the frame 100 increases, and the speed of the die head 400 outputting plastic becomes faster. When the amount of plastic passing through the screen changer 310 decreases, at this time, the pressure between the screen changer 310 and the frame 100 decreases, and the speed of the die head 400 outputting plastic becomes slower; if the rotation speed of the cutter head 520 remains the same, in this case, when the speed of the die head 400 outputting plastic becomes faster, the volume of the particles cut by the cutter head 520 will be larger, and when the speed of the die head 400 outputting plastic becomes slower, the volume of the particles cut by the cutter head 520 will be smaller.

[0046] It can be understood that in the granulator of the present invention, the sensor can detect the magnitude of the pressure between the screen changer 310 and the frame 100, and the screen changer 310 is electrically connected to the first driver 510. When the pressure detected by the sensor increases, the first driver 510 drives the cutter head 520 to rotate at an increased speed. When the pressure detected by the sensor decreases, the first driver 510 drives the cutter head 520 to rotate at a decreased speed, so that the volume of the particles cut by the cutter head 520 is kept within a certain range, and thus the size of the particles produced by the granulator of the present invention is more uniform.

[0047] In some embodiments of the present invention, referring to Figure 3 and Figure 4 , a pelletizing cavity 101 is formed in the frame 100. The die head 400 and the cutter head 520 are both arranged in the pelletizing cavity 101. A discharge channel is communicated with the lower end of the pelletizing cavity 101, and the discharge channel is used to discharge the particles in the pelletizing cavity 101.

[0048] It can be understood that the setting of the pelletizing cavity 101 enables the action of the cutter head 520 cutting plastic to be completed in the pelletizing cavity 101. On the one hand, it can reduce the probability of the splashing particles causing harm to the staff. On the other hand, it can reduce the probability of the rotating cutter head 520 causing harm to the staff. On the other hand, it can prevent the particles cut by the cutter head 520 from splashing everywhere, so as to reduce the difficulty of collecting the particles.

[0049] In some embodiments of the present invention, referring to Figure 1 and Figure 3 , an orifice communicating with the pelletizing cavity 101 is opened on the cavity wall of the pelletizing cavity 101. The orifice is provided with a cavity door 110 for closing the orifice, and the first driver 510 is arranged on the cavity door 110.

[0050] It is understandable that after the granulator of the present invention has been working for a period of time, the staff needs to clean or replace the cutter head 520. By arranging the first driver 510 on the chamber door 110, when the staff opens the chamber door 110, the first driver 510 can move with the chamber door 110, so that the cutter head 520 can move with the chamber door 110 to be exposed to the external environment, thereby facilitating the staff to clean or replace the cutter head 520.

[0051] In some embodiments of the present invention, a protective member 120 is movably provided on the chamber door 110. Under the action of external force, the protective member 120 can switch between an avoidance state and a protection state. When the protective member 120 is in the protection state, the protective member 120 cooperates with the chamber door 110 to wrap the cutting head 520. When the protective member 120 is in the avoidance state, the protective member 120 opens the wrapped cutting head 520.

[0052] For example, Figures 1 to 4 As shown, one end of the protective member 120 is hinged to the chamber door 110 , and under the action of external force, the protective member 120 can rotate up and down relative to the chamber door 110 .

[0053] It is understandable that the staff can drive the protective member 120 to rotate downward so that the protective member 120 switches to a protective state. At this time, the protective member 120 wraps the cutter head 520. In this case, the staff can clean the pelletizing chamber 101 more safely, reducing the probability of the cutter head 520 accidentally injuring the staff; when the staff needs to close the chamber door 110, the staff can drive the protective member 120 to rotate upward so that the protective member 120 switches to an avoidance state. At this time, the protective member 120 opens the wrapped cutter head 520. After the chamber door 110 is closed, under the drive of the first driver 510, the cutter head 520 can successfully complete the cutting of the plastic output by the die head 400.

[0054] In some embodiments of the present invention, the protection member 120 is hinged to the outer surface of the door 110 .

[0055] For example, Figures 1 to 4 As shown, one end of the protection member 120 is hinged to the upper surface of the chamber door 110 .

[0056] It can be understood that, since the protective member 120 is hinged to the outer surface of the chamber door 110, when the staff drives the protective member 120 to rotate upward to switch the protective member 120 to the avoidance state and closes the chamber door 110, the protective member 120 can be outside the pelletizing chamber 101; on the one hand, under the drive of the first driver 510, the cutter head 520 can rotate to complete the pelletizing of the plastic, and the protective member 120 is located on the outside of the granulation chamber, which can prevent the protective member 120 from automatically switching to the avoidance state under factors such as vibration and affecting the normal operation of the cutter head 520; on the other hand, since the protective member 120 can be located outside the granulation chamber when the cutter head 520 cuts the plastic, the granulation chamber does not need to set up more space to accommodate the protective member 120, and accordingly, the space of the granulation chamber can be set smaller to achieve the miniaturization of the granulator of the present invention.

[0057] In some embodiments of the present invention, one end of the cavity door 110 is hinged to the edge of the cavity opening, and the other end of the cavity door 110 is detachably connected to the edge of the cavity opening via a connecting assembly 130 .

[0058] For example, Figures 1 to 4 As shown, the right end of the cavity door 110 is hinged to the edge of the cavity opening, and the left end of the cavity door 110 is detachably connected to the edge of the cavity opening through a connecting assembly 130.

[0059] Furthermore, after the staff contacts the connection between the left end of the chamber door 110 and the edge of the chamber opening, the staff can drive the chamber door 110 to rotate around the right end of the chamber door 110 so that the chamber door 110 opens.

[0060] It is understandable that since one end of the chamber door 110 is hinged to the edge of the chamber opening, when the staff rotates the chamber door 110 to open the chamber door 110, the cutter head 520 located on the inner side of the chamber door 110 can just face the staff, so that the staff can clean the cutter head 520.

[0061] In some embodiments of the present invention, reference Figure 2 and Figure 4 The connecting assembly 130 includes a handle 131, a locking sleeve 132 and a lock buckle 133. The handle 131 is hinged to the edge of the cavity opening. One end of the locking sleeve 132 is hinged to the handle 131. The other end of the locking sleeve 132 can be movably mounted on the lock buckle 133. The lock buckle 133 is installed on the cavity door 110. Under the action of external force, the handle 131 can rotate relative to the edge of the cavity opening so that the lock buckle 133 can be tightened or loosened.

[0062] Furthermore, when it is necessary to lock the cavity door 110, the staff can close the cavity door 110. Then, the staff rotates the lock sleeve 132 forward so that the lock sleeve 132 is sleeved on the lock catch 133. After that, the staff can rotate the handle 131 backward. Driven by the handle 131, the entire lock sleeve 132 moves backward to lock and fix the lock catch 133 with the lock sleeve 132; when it is necessary to open the cavity door 110, the staff can rotate the handle 131 forward. Driven by the handle 131, the entire lock sleeve 132 moves forward to release the locking and fixing of the lock catch 133. After that, the staff can remove the lock sleeve 132 sleeved on the lock catch 133 and rotate the cavity door 110, thereby opening the cavity door 110.

[0063] It can be understood that in the granulator of the present invention, the staff can lock or release the cavity door 110 by simply rotating the handle 131, and the locking or releasing process of the cavity door 110 is simpler and more convenient.

[0064] In some embodiments of the present invention, the granulator further includes a feeding module 600. The feeding module 600 includes a second driver 610 and a feeding screw 620. One end of the feeding screw 620 faces the melting module 200. The second driver 610 is connected to the feeding screw 620 and is used to drive the feeding screw 620 to rotate to convey plastic to the melting module 200.

[0065] For example, as Figure 5 and Figure 6 shown, the feeding module 600 includes a second driver 610 and a feeding screw 620. The feeding screw 620 extends in the front-rear direction. The front end of the feeding screw 620 faces the melting module 200, and the circumferential surface of the feeding screw 620 is provided with a thread groove.

[0066] Furthermore, driven by the second driver 610, the feeding screw 620 can rotate so that the plastic can be conveyed forward along the thread groove into the melting module 200.

[0067] In a further embodiment of the present invention, the feeding screw 620 includes a plurality of thread segments 621; the feeding module 600 further includes a cutting structure 630. The cutting structure 630 is arranged between adjacent two thread segments 621 and is used to cut the plastic on the feeding screw 620.

[0068] For example, as Figure 6 shown, the feeding screw 620 includes three thread segments 621 spaced apart in the front-rear direction. Each thread segment 621 is provided with a thread sub-groove extending in the thread. The feeding module 600 further includes two cutting structures 630, and a cutting structure is arranged between any adjacent two thread segments 621.

[0069] It can be understood that during the rotation of the feeding screw 620, the plastic can sequentially pass through each thread sub-groove from the rear to the front and enter the melting module 200. Since a cutting structure 630 is provided between any two adjacent thread segments 621, during each rotation of the feeding screw 620, the cutting structure 630 can cut the plastic between two adjacent thread segments 621 once, so that the plastic output by the feeding module 600 is in the form of sections, reducing the probability of the plastic winding around the feeding screw 620 and facilitating the subsequent melting of the plastic by the melting module 200.

[0070] In some embodiments of the present invention, referring to Figure 1 and Figure 3 , the granulator further includes a feeding hopper 700, and the discharging end of the feeding port faces the rear end of the feeding screw 620.

[0071] It can be understood that the staff puts the plastic into the feeding hopper 700, so that the plastic can be automatically fed along the feeding hopper 700 into the thread groove of the feeding screw 620.

[0072] In some embodiments of the present invention, referring to Figure 5 , the melting module 200 includes a tapered flange sleeve 210 and a flange long sleeve 220. The feeding end of the tapered flange sleeve 210 is communicated with the feeding module 600, the discharging end of the tapered flange sleeve 210 is communicated with the feeding end of the flange long sleeve 220, and the discharging end of the flange long sleeve 220 is communicated with the filtering module 300. It can be understood that after the feeding module 600 conveys the plastic into the tapered flange sleeve 210, the tapered flange sleeve 210 will extrude the plastic to compact it. After the compacted plastic is conveyed from the tapered flange sleeve 210 into the flange long sleeve 220, the flange long sleeve 220 melts the plastic.

[0073] In some embodiments of the present invention, referring to Figure 7 , the granulator further includes a cooling module 800. The cooling module 800 includes a fan 810 and a wind guiding structure 820. A spiral wind guiding channel 821 is formed in the wind guiding structure 820, and the wind guiding channel 821 is arranged around the fan 810. The fan 810 is adjacent to the air inlet 821a of the wind guiding channel 821 and is used to output air flow to the air inlet 821a of the wind guiding channel 821. The air outlet 821b of the wind guiding channel 821 faces the feeding port of the die head.

[0074] It can be understood that by setting the cooling module 800, the cooling module 800 can blow cold air to the feeding port of the die head to cool the molten plastic; at the same time, since the cooling module 800 cools the plastic by air cooling, the use of cooling water can be reduced and resources can be saved.

[0075] It can be understood that since the air guiding channel 821 extends spirally, on the premise that the air guiding channel 821 has a certain length, the size of the entire air guiding structure 820 can be set smaller, and the structure of the entire cooling module 800 can be more compact.

[0076] The following refers to Figure 8 to elaborate in detail on the control method provided in the embodiments of the second aspect of the present invention.

[0077] Referring to Figure 8 , according to the control method provided in the embodiments of the second aspect of the present invention, it is applied to the granulator provided in the embodiments of the first aspect of the present invention; the control method includes but is not limited to the following steps:

[0078] Step S100: Continuously obtain the pressure detected by the sensor;

[0079] Step S200: Determine whether the pressure detected by the sensor increases or decreases, and correspondingly increase or decrease the rotation speed of the cutter head 520.

[0080] It can be understood that when the pressure detected by the sensor increases, it indicates that more plastic passes through the screen changer 310. Correspondingly, the speed of the die head 400 outputting plastic increases. In this case, by increasing the rotation speed of the cutter head 520, the size of the particles cut by the cutter head 520 can be kept relatively stable; when the pressure detected by the sensor decreases, it indicates that less plastic passes through the screen changer 310. Correspondingly, the speed of the die head 400 outputting plastic decreases. In this case, by decreasing the rotation speed of the cutter head 520, the size of the particles cut by the cutter head 520 can be kept relatively stable.

[0081] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A granulator, characterized in that, Comprising: A frame; A melting module, disposed on the frame and used for melting plastics; A filtering module, disposed on the frame, the filtering module includes a screen changer and a sensor, the screen changer is used for filtering the melted plastics, and the sensor is disposed between the screen changer and the frame and is used for detecting the pressure exerted by the plastics on the screen changer; A die head, disposed on the frame and located on the side of the screen changer away from the melting module, the die head is used for outputting the plastics filtered by the screen changer; A granulating module, disposed on the frame, the granulating module includes a first driver and a cutter head, the cutter head is disposed on one side of the die head, the first driver is connected to the cutter head and is electrically connected to the sensor, the first driver can drive the cutter head to rotate to cut the plastics output by the die head into particles, and the greater the pressure value detected by the sensor, the greater the rotation speed of the first driver driving the cutter head.

2. The granulator according to claim 1, wherein, A granulating cavity is formed in the frame, the die head and the cutter head are both disposed in the granulating cavity, a discharge channel is communicated with the lower end of the granulating cavity, and the discharge channel is used for discharging the particles in the granulating cavity.

3. A granulator according to claim 2, characterized in that, An orifice communicating with the granulating cavity is formed in the cavity wall of the granulating cavity, a cavity door for closing the orifice is disposed at the orifice, and the first driver is disposed on the cavity door.

4. The granulator according to claim 3, wherein A protective member is movably disposed on the cavity door, and under the action of an external force, the protective member can be switched between an avoidance state and a protection state. When the protective member is in the protection state, the protective member cooperates with the cavity door to wrap the cutter head. When the protective member is in the avoidance state, the protective member opens the wrapped cutter head.

5. A granulator according to claim 4, characterized in that, The protective member is hinged to the outer surface of the cavity door.

6. A granulator according to any one of claims 3 to 5, characterized in that One end of the cavity door is hinged to the edge of the orifice, and the other end of the cavity door is detachably connected to the edge of the orifice through a connecting component.

7. A granulator according to claim 6, characterized in that, The connecting component includes a handle, a lock sleeve and a lock catch. The handle is hinged to the edge of the orifice. One end of the lock sleeve is hinged to the handle, and the other end of the lock sleeve is movably sleeved on the lock catch. The lock catch is installed on the cavity door. Under the action of an external force, the handle can rotate relative to the edge of the orifice so that the lock catch tightens or loosens the lock catch.

8. A granulator according to claim 1, characterized in that, It further includes a feeding module, the feeding module includes a second driver and a feeding screw. One end of the feeding screw faces the melting module. The second driver is connected to the feeding screw and is used for driving the feeding screw to rotate to convey plastics to the melting module.

9. The granulator according to claim 8, characterized in that, The feeding screw includes a plurality of threaded segments; the feeding module further includes a cutting structure, the cutting structure is disposed between adjacent two threaded segments and is used for cutting the plastics on the feeding screw.

10. A control method, characterized in that, Applied to the granulator according to any one of claims 1 to 9, the control method includes the following steps: Continuously obtain the pressure detected by the sensor; Judge whether the pressure detected by the sensor increases or decreases, and correspondingly increase or decrease the rotation speed of the cutter head.

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