Cutter of unit type plastic granulator

Abstract

The utility model relates to the technical field of granulator auxiliary devices, and discloses a unit type plastic granulator cutter which comprises a round roller, a blade is fixedly connected to the outer side of the round roller, a cavity is formed in the round roller, a strip-shaped groove is formed in the surface of the outer side of the round roller, a rubber diaphragm is fixedly connected to the interior of the strip-shaped groove, and the rubber diaphragm is fixedly connected to the outer side of the round roller. An air hole is formed in the bottom surface in the strip-shaped groove, a through hole is formed in the surface of the inner wall of the left side of the cavity, a rotating shaft is rotationally connected to the surface of the left side of the round roller through a sealing bearing, and a communicating unit is arranged in the rotating shaft. According to the utility model, through the cooperation of the cavity, the strip-shaped groove, the air hole, the through hole, the sealing bearing, the rotating shaft and the communication unit, the rubber diaphragm can be expanded to accumulate plastic strips and plastic particles clamped in a crack of the blade, so that the material strips or the plastic particles clamped in the blade are prevented from hindering the cutting of other material strips by the cutter; the cutting effect is influenced.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary devices for pelletizers, and in particular to a unit-type plastic pelletizer cutter. Background Art

[0002] In a plastic extrusion granulation production line, the raw materials for plastic granulation are first melted and extruded from a plastic extruder into strips. The long strips are cooled to increase their hardness before entering a pelletizer where they are cut into pellets by a cutter to form the final plastic particles. The cutter of the plastic pelletizer is usually a carbide roller cutter, which has extremely high wear resistance.

[0003] A search revealed that Chinese Patent Publication No. CN218195329U discloses a cutting blade for a plastic pelletizer. This blade body has an inner diameter larger than the outer diameter of the screw head of the first fastening bolt and communicates with the limiting hole. When disassembling the blade body, it is not necessary to remove all the first fastening bolts; only the first fastening bolts need to be loosened. This greatly shortens the disassembly and assembly time of the blade body without affecting the overall fixing strength, which is conducive to its widespread use.

[0004] In actual use, when the aforementioned cutter is cutting plastic strips, if the plastic strips are not fed into the cutting device perpendicular to the cutting surface, causing the strips to cross, the strips will get stuck in the blade gap. This will prevent the cutter from cutting the remaining strips, resulting in a decrease in cutting quality and ultimately causing production problems. Therefore, a unit-type plastic pelletizer cutter is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a unit-type plastic pelletizer cutter blade, which aims to improve the problem in the prior art where plastic strips or plastic particles easily get stuck in the blade gap when cutting plastic strips, resulting in a decrease in cutting quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a unit-type plastic pelletizer cutter includes a circular roller, a blade fixedly connected to the outer side of the circular roller, a cavity opened inside the circular roller, a strip groove opened on the outer surface of the circular roller, a rubber diaphragm fixedly connected inside the strip groove, an air hole opened on the bottom surface inside the strip groove, a through hole opened on the left inner wall surface of the cavity, a rotating shaft rotatably connected to the left surface of the circular roller through a sealed bearing, and a connecting unit provided inside the rotating shaft, the connecting unit serving to connect the outside world with the inside of the cavity.

[0007] As a further description of the above technical solution:

[0008] A connecting pipe is fixedly connected to the back of the rotating shaft, and an air pump is fixedly connected to the end of the connecting pipe away from the rotating shaft. A pressure relief valve is fixedly connected to the outside of the connecting pipe.

[0009] As a further description of the above technical solution:

[0010] The connecting unit includes a circular hole, which is opened on the right side surface of the rotating shaft, and a connecting hole is opened on the rear inner wall surface of the circular hole.

[0011] As a further description of the above technical solution:

[0012] The air holes penetrate the circular roller, and the air holes are interconnected with the interior of the cavity.

[0013] As a further description of the above technical solution:

[0014] The inner ring of the sealed bearing has a hollow structure at its center.

[0015] As a further description of the above technical solution:

[0016] The rear end of the connecting hole is fixedly connected to the front end of the connecting pipe.

[0017] As a further description of the above technical solution:

[0018] The interior of the circular hole is connected to the through hole through the center of the sealed bearing.

[0019] As a further description of the above technical solution:

[0020] The outer wall of the rubber diaphragm is in contact with the inner wall of the strip groove.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the combination of the cavity, strip groove, air hole, through hole, sealed bearing, rotating shaft and connecting unit allows the rubber diaphragm to expand, accumulating the plastic strips and plastic particles stuck in the blade gap, preventing the strips or plastic particles stuck in the blade from hindering the cutter from cutting the remaining strips, affecting the cutting effect, causing a decrease in cutting quality, and preventing the result from affecting the rotational cutting of the cutter.

[0023] 2. In this utility model, the connecting pipe, air pump and pressure relief valve can be used to charge and release air into the strip groove, so that the rubber diaphragm can continuously expand and reset, so as to push the material strip or plastic granules stuck in the blade and discharge them, thus avoiding the plastic material strips and granules being stuck too tightly and difficult to discharge. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the unit-type plastic pelletizer cutter proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the outer side of the circular roller of the unit-type plastic pelletizer cutter proposed in this utility model after a rubber diaphragm has been removed.

[0026] Figure 3 This is a schematic diagram of the left-side cross-section of the rubber diaphragm of the cutter blade of a unit-type plastic pelletizer proposed in this utility model;

[0027] Figure 4 This is a schematic cross-sectional view of the rotating shaft portion of the cutter of a unit-type plastic pelletizer proposed in this utility model.

[0028] Legend:

[0029] 1. Circular roller; 2. Blade; 3. Cavity; 4. Strip groove; 5. Rubber diaphragm; 6. Air hole; 7. Through hole; 8. Sealed bearing; 9. Shaft; 91. Circular hole; 92. Connecting hole; 10. Connecting pipe; 11. Air pump; 12. Pressure relief valve. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Reference Figures 1-3 This utility model provides an embodiment of a unit-type plastic pelletizer cutter, including a circular roller 1. A number of blades 2 are fixedly connected to the outer side of the circular roller 1 in a circular array. A cavity 3 is formed inside the circular roller 1, and a strip-shaped groove 4 is formed on the outer surface of the circular roller 1. The number of strip-shaped grooves 4 matches the number of blades 2. The strip-shaped grooves 4 are located in the gap between two blades 2. A rubber diaphragm 5 is fixedly connected inside the strip-shaped groove 4. When air enters the strip-shaped groove 4, the rubber diaphragm 5 expands outwards. At this time, the rubber diaphragm 5 can push the material strips or plastic particles stuck in the gap between the blades 2, allowing the material strips or plastic particles to be discharged from the gap between the blades 2. This prevents the stuck material strips or plastic particles from hindering the cutter from cutting the remaining material strips and affecting the cutting effect. The outer wall of the rubber diaphragm 5 is in contact with the inner wall of the strip-shaped groove 4. When airflow enters the strip-shaped groove 4, it can completely push the rubber diaphragm 5, causing it to expand.

[0032] Reference Figures 2-4 The bottom surface of the strip groove 4 is provided with an air hole 6, which penetrates the roller 1 and is connected to the interior of the cavity 3. After the airflow enters the cavity 3, it can enter the strip groove 4 through the air hole 6. The inner surface of the left side of the cavity 3 is provided with a through hole 7, through which external airflow can enter the cavity 3. The left side surface of the roller 1 is rotatably connected to a rotating shaft 9 via a sealed bearing 8. When the rotating shaft 9 is fixed on the inner wall of the plastic pelletizer, it provides limiting support for the roller 1 and avoids obstructing the rotation of the roller 1 through the sealed bearing 8. The center of the inner ring of the sealed bearing 8 is hollow.

[0033] The rotating shaft 9 has a connecting unit inside, which includes a circular hole 91. The circular hole 91 is located on the right side surface of the rotating shaft 9. The interior of the circular hole 91 is connected to the through hole 7 through the center of the sealed bearing 8. A connecting hole 92 is provided on the rear inner wall surface of the circular hole 91. External airflow can enter the interior of the circular hole 91 through the connecting hole 92, and then enter the interior of the cavity 3 through the center of the sealed bearing 8 and the through hole 7. The connecting hole 92, the circular hole 91, the center of the sealed bearing 8, the through hole 7, the cavity 3, the air hole 6, and the interior of the strip groove 4 constitute a complete air intake channel. No matter how the circular roller 1 rotates, the airflow can enter the interior of the strip groove 4, causing the rubber diaphragm 5 to expand.

[0034] Reference Figure 1 A connecting pipe 10 is fixedly connected to the back of the rotating shaft 9. The rear end of the connecting hole 92 is fixedly connected to the front end of the connecting pipe 10. An air pump 11 is fixedly connected to the end of the connecting pipe 10 away from the rotating shaft 9. When the air pump 11 is started, gas can be continuously pumped into the connecting hole 92 through the connecting pipe 10, causing the rubber diaphragm 5 to expand. During the rotational cutting process of the cutter, the airflow generated by the air pump 11 can enter the interior of the rotating shaft 9 and be filled into the cavity 3 through the sealed bearing 8. The airflow supply will not be interrupted due to the rotation of the cutter. A pressure relief valve 12 is fixedly connected to the outside of the connecting pipe 10. When it is necessary to restore the rubber diaphragm 5, the pressure relief valve 12 can be opened to quickly discharge the airflow. By continuously and alternately starting the air pump 11 and the pressure relief valve 12, the rubber diaphragm 5 can be continuously expanded and reset to push the material strip or plastic particles stuck in the blade 2 and then discharge them.

[0035] Working principle: When installing the cutter, first fix the rotating shaft 9 to the inner wall of the plastic pelletizer to complete the installation of the cutter. Then, the cutter can be connected to the drive component and rotated to cut the plastic strip. When the roller 1 rotates and drives the blade 2 to rotate and cut the strip, the air pump 11 can be started to allow airflow to enter the strip groove 4 through the air intake channel formed by the connecting hole 92, the round hole 91, the center of the sealed bearing 8, the through hole 7, the cavity 3 and the air hole 6. This causes the rubber diaphragm 5 to expand and push out the strip or plastic particles stuck in the blade 2, so as to avoid affecting the cutting effect. After cleaning, the pressure relief valve 12 can be started to discharge the airflow, so that the rubber diaphragm 5 returns to its deformation and avoids affecting the cutting effect of the blade 2.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A unit-type plastic pelletizer cutter, comprising a circular roller (1), characterized in that: A blade (2) is fixedly connected to the outer side of the roller (1). A cavity (3) is opened inside the roller (1). A strip groove (4) is opened on the outer surface of the roller (1). A rubber diaphragm (5) is fixedly connected inside the strip groove (4). An air hole (6) is opened on the bottom surface of the strip groove (4). A through hole (7) is opened on the inner wall surface of the left side of the cavity (3). A rotating shaft (9) is rotatably connected to the left side of the roller (1) through a sealed bearing (8). A connecting unit is provided inside the rotating shaft (9). The connecting unit is used to connect the outside world with the inside of the cavity (3).

2. The cutting blade of a unit-type plastic pelletizer according to claim 1, characterized in that: A connecting pipe (10) is fixedly connected to the back of the rotating shaft (9). An air pump (11) is fixedly connected to one end of the connecting pipe (10) away from the rotating shaft (9). A pressure relief valve (12) is fixedly connected to the outside of the connecting pipe (10).

3. The cutting blade of a unit-type plastic pelletizer according to claim 1, characterized in that: The connecting unit includes a circular hole (91), which is opened on the right side surface of the rotating shaft (9), and a connecting hole (92) is opened on the rear inner wall surface of the circular hole (91).

4. The cutting blade of a unit-type plastic pelletizer according to claim 1, characterized in that: The air hole (6) penetrates through the roller (1), and the air hole (6) is interconnected with the interior of the cavity (3).

5. The cutting blade of a unit-type plastic pelletizer according to claim 1, characterized in that: The inner ring of the sealed bearing (8) has a hollow structure at its center.

6. The cutting blade of a unit-type plastic pelletizer according to claim 3, characterized in that: The rear end of the connecting hole (92) is fixedly connected to the front end of the connecting pipe (10).

7. The cutting blade of a unit-type plastic pelletizer according to claim 3, characterized in that: The interior of the circular hole (91) is connected to the through hole (7) through the center of the sealed bearing (8).

8. The cutting blade of a unit-type plastic pelletizer according to claim 1, characterized in that: The outer wall of the rubber diaphragm (5) is in contact with the inner wall of the groove (4).

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