Heating structure of plastic particle melting cylinder

Abstract

The utility model discloses a heating structure of a plastic particle melting cylinder, which belongs to the technical field of injection molding part processing, and comprises a melting cylinder body and a heating mechanism arranged on the melting cylinder body, the melting cylinder body is communicated with a preheating cylinder, and the preheating cylinder is provided with a grinding cylinder; a grinding assembly is arranged on the grinding cylinder and used for grinding plastic particles. The grinding assembly comprises a motor located over the grinding cylinder and a grinding head located below the motor. The heating mechanism and the electric heating piece are arranged to generate heat, so that plastic particles are accelerated to react in the grinding process, the fluidity is improved, the grinding time is shortened, plastic powder in the preheating cylinder is heated and melted, the plastic particles are prevented from being directly added into liquid plastic as much as possible, and the grinding efficiency is improved. And the problems that the temperature of liquid plastic is not uniform, and when the melting cylinder injects liquid into the injection molding cavity of the injection molding machine, the risk that plastic particles which are not completely melted are increased, and consequently the texture of produced injection molding parts is not uniform are easily avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molding processing, and in particular relates to a heating structure of a plastic particle melting cylinder. Background Art

[0002] Injection molding machines are mostly used in injection molding. They are the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics.

[0003] Injection molding machines are generally equipped with a melting barrel, which is used to heat solid plastic particles to a certain temperature to turn them into liquid state for subsequent processing operations, such as injection molding, extrusion, blow molding, etc.

[0004] At present, the melting barrel is usually equipped with a heating structure, which is used to heat the melting barrel to melt the plastic particles inside. The plastic particles are generally poured directly into the melting barrel. At this time, the liquid plastic melted by the heating structure is in direct contact with the plastic particles. The plastic particles are mixed in the liquid plastic, resulting in uneven temperature of the liquid plastic and increasing the risk of incompletely melted plastic particles when the melting barrel is injected into the injection molding cavity of the injection molding machine, which easily causes uneven texture of the produced injection molded parts.

[0005] In order to solve the above problems, the present application proposes a heating structure for a plastic particle melting cylinder. Summary of the invention

[0006] In view of the problems in the related art, the utility model proposes a heating structure of a plastic particle melting cylinder to overcome the above technical problems existing in the existing related art.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A heating structure for a plastic particle melting cylinder comprises a melting cylinder body and a heating mechanism arranged on the melting cylinder body, wherein the melting cylinder body is connected to a preheating cylinder, and a grinding cylinder is installed on the preheating cylinder;

[0009] The grinding cylinder is provided with a grinding assembly for grinding plastic particles;

[0010] The grinding assembly includes a motor located directly above the grinding cylinder and a grinding head located below the motor;

[0011] The heating mechanism comprises an electric heating plate installed on the melting barrel body, a heat conducting rod is installed on the electric heating plate, a ball is movably clamped at one end of the heat conducting rod, and the outer side of the ball contacts the top of the grinding head;

[0012] A second mesh heating wire is installed in the preheating cylinder, and the heat conducting rod is connected to the second mesh heating wire.

[0013] A first mesh heating wire is installed in the melting cylinder body, and the first mesh heating wire is connected to the electric heating plate. The first mesh heating wire is arranged to heat the liquid plastic in the melting cylinder.

[0014] The inner bottom wall of the grinding cylinder is conical, and a plurality of discharge holes are provided around the inner bottom wall of the grinding cylinder. A shaft rod is installed at the output end of the motor, and the grinding head is installed at the bottom end of the shaft rod. The gap between the outer side of the grinding head and the grinding cylinder is larger than the diameter of the plastic particles. The conical inner bottom wall of the grinding cylinder, the discharge holes and the shaft rod are provided to drive the grinding head to grind the plastic particles.

[0015] A filter screen is installed at the bottom of the preheating cylinder, and the filter screen is provided to intercept plastic powder.

[0016] The grinding cylinder is provided with a mounting rod, and the motor is mounted on the mounting rod. By providing the mounting rod, the mounting rod is used to support the motor.

[0017] An annular tube is installed on the mounting rod, a plurality of air holes are opened on the annular tube, a connecting tube is connected to the annular tube, and a negative pressure fan is installed on the connecting tube. The annular tube, air holes, connecting tube and negative pressure fan are arranged to cool the heat conducting rod near the grinding head.

[0018] A temperature control switch is installed on the grinding cylinder, and the temperature control switch is electrically connected to the negative pressure fan. The temperature control switch is provided to control the opening and closing of the negative pressure fan.

[0019] In summary, the technical effects and advantages of the utility model are as follows: the heating structure of the plastic particle melting barrel, by setting a heating mechanism, the electric heating plate generates heat, so that the reaction of the plastic particles during the grinding process is accelerated, the fluidity is improved, and the grinding time is reduced, and the plastic powder in the preheating barrel is heated and melted, which avoids the direct addition of plastic particles into liquid plastic as much as possible, helps to avoid uneven temperature of the liquid plastic and increases the risk of incompletely melted plastic particles when the melting barrel is injected into the injection molding cavity of the injection molding machine, which easily causes uneven texture of the produced injection molded parts.

[0020] The negative pressure fan is started by the temperature control switch, so that the heat on the heat-conducting rod attached to the annular tube is gradually discharged by the air flowing into the air hole, which is used to cool the end of the heat-conducting rod close to the grinding head, thereby achieving the effect of cooling the grinding head, which helps to prevent the easily meltable plastic particles from melting during the grinding process and affecting the grinding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This utility model is a schematic diagram showing the overall structure of the device;

[0022] Figure 2 This utility model is a cross-sectional schematic diagram showing the internal structure of the melting cylinder;

[0023] Figure 3 The utility model is a cross-sectional schematic diagram showing the internal structure of the preheating cylinder and the grinding cylinder.

[0024] In the figure:

[0025] 1. Melting cylinder body; 2. Preheating cylinder; 3. Grinding cylinder;

[0026] 4. Heating mechanism; 401. Electric heating sheet; 402. First mesh heating wire; 403. Heat conducting rod; 404. Second mesh heating wire; 405. Ball;

[0027] 5. Grinding assembly; 501. Mounting rod; 502. Motor; 503. Shaft rod; 504. Grinding head; 505. Feeding hole;

[0028] 6. Annular tube; 7. Air hole; 8. Connecting tube; 9. Negative pressure fan; 10. Filter; 11. Temperature control switch. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] Reference Figure 1 A heating structure for a plastic particle melting cylinder comprises a melting cylinder body 1 and a heating mechanism 4 arranged on the melting cylinder body 1. The melting cylinder body 1 is connected with a preheating cylinder 2. The preheating cylinder 2 is provided with a grinding cylinder 3. The grinding cylinder 3 is provided with a grinding assembly 5 for grinding plastic particles. The grinding assembly 5 comprises a motor 502 located directly above the grinding cylinder 3 and a grinding head 504 located below the motor 502. The top of the grinding head 504 is conical, the inner bottom wall of the grinding cylinder 3 is conical, and the inner bottom wall of the grinding cylinder 3 is open all around. A plurality of discharge holes 505 are provided, a shaft 503 is installed at the output end of the motor 502, a grinding head 504 is installed at the bottom end of the shaft 503, a gap between the outer side of the grinding head 504 and the grinding cylinder 3 is larger than the diameter of the plastic particles, the plastic particles are poured into the grinding cylinder 3, the plastic particles slide along the top of the grinding head 504, the motor 502 is started, so that it drives the shaft 503 to rotate, the rotation of the shaft 503 drives the rotation of the grinding head 504, which is used to grind the plastic particles, thereby achieving the effect of reducing the size of the plastic particles.

[0031] Reference Figure 2 and Figure 3The heating mechanism 4 includes an electric heating plate 401 installed on the melting cylinder body 1, and a heat-conducting rod 403 is installed on the electric heating plate 401. A ball 405 is movably clamped at one end of the heat-conducting rod 403. The outer side of the ball 405 contacts the top of the grinding head 504. The heat-conducting rod 403 is used to transfer the heat generated by the electric heating plate 401 to the ball 405. The ball 405 heats the grinding head 504, which helps to accelerate the grinding process of the plastic particles because thermal energy can provide more energy to overcome the binding force between the particles. In addition, at high temperatures, the plastic particles may become softer and more fluid, which is helpful for particle crushing and mixing during the grinding process. As high temperature can accelerate the grinding process, the grinding time required to reach the desired particle size may be reduced.

[0032] Reference Figure 3 A second mesh heating wire 404 is installed in the preheating cylinder 2, and the heat conducting rod 403 is connected to the second mesh heating wire 404. The second mesh heating wire 404 is used to receive the heat of the heat conducting rod 403 to heat and melt the plastic powder.

[0033] A filter screen 10 is installed at the bottom of the preheating cylinder 2, and the filter screen 10 is used to intercept the plastic that is not completely melted.

[0034] Reference Figure 1 A mounting rod 501 is installed on the grinding cylinder 3 , and the motor 502 is installed on the mounting rod 501 . The mounting rod 501 is used to support the motor 502 .

[0035] Reference Figure 2 A first mesh heating wire 402 is installed in the melting cylinder body 1, and the first mesh heating wire 402 is connected to the electric heating plate 401. The first mesh heating wire 402 is used to heat the liquid plastic in the melting cylinder body 1 to avoid solidification of the liquid plastic as much as possible.

[0036] Reference Figure 3 An annular tube 6 is installed on the mounting rod 501, and a plurality of air holes 7 are opened on the annular tube 6. A connecting tube 8 is connected to the annular tube 6, and a negative pressure fan 9 is installed on the connecting tube 8. The negative pressure fan 9 is a 400 type negative pressure fan. By starting the negative pressure fan 9, the heat on the heat-conducting rod 403 near the annular tube 6 is gradually discharged by the air flowing into the air hole 7, which is used to cool down the end of the heat-conducting rod 403 close to the grinding head 504, thereby achieving the effect of cooling the grinding head 504, which helps to prevent the easily melted plastic particles from melting during the grinding process and affecting the grinding effect.

[0037] A temperature control switch 11 is installed on the grinding cylinder 3. The temperature control switch 11 is specifically an infrared temperature control switch of model KS 218 - TS. The temperature control switch 11 is electrically connected to the negative pressure fan 9. First, two thresholds are set for the temperature control switch 11. Threshold 1 is 3 degrees lower than the melting temperature of the ground plastic particles, and threshold 2 is 6 degrees lower than threshold 1. When the temperature monitored by the temperature control switch 11 reaches threshold 1, the temperature control switch 11 controls the negative pressure fan 9 to start. When the temperature monitored by the temperature control switch 11 reaches threshold 2, the temperature control switch 11 controls the negative pressure fan 9 to close, thereby achieving the effect of facilitating the opening and closing of the negative pressure fan 9.

[0038] Among them, the circuit connection method between the temperature control switch 11 and the negative pressure fan 9 can be reasonably set according to actual conditions, and the signal transmission method is the existing technology.

[0039] Working principle:

[0040] The heating structure of the plastic particle melting barrel utilizes the heating mechanism 4 and the electric heating plate 401 to generate heat, and the first mesh heating wire 402 heats the melting barrel body 1. In addition, the heat conducting rod 403 conducts the heat to the ball 405 and the second mesh heating wire 404, so that the reaction of the plastic particles is accelerated, the fluidity is improved, and the grinding time is reduced during the grinding process, and the plastic powder in the preheating barrel 2 is heated and melted, and the direct addition of the plastic particles into the liquid plastic is avoided as much as possible, which helps to avoid the uneven temperature of the liquid plastic and the risk of increasing the incompletely melted plastic particles when the melting barrel is injected into the injection molding cavity of the injection molding machine, which is easy to cause the production of injection molded parts with uneven texture.

[0041] The heating structure of the plastic particle melting cylinder first sets two thresholds for the temperature control switch 11, threshold one is 3 degrees lower than the melting temperature of the ground plastic particles, and threshold two is 6 degrees lower than threshold one. When the temperature monitored by the temperature control switch 11 reaches threshold one, the temperature control switch 11 controls the negative pressure fan 9 to start, and when the temperature monitored by the temperature control switch 11 reaches threshold two, the temperature control switch 11 controls the negative pressure fan 9 to shut down. By starting the negative pressure fan 9, the heat on the heat-conducting rod 403 near the annular tube 6 is gradually discharged by the air flowing into the air hole 7, which is used to cool the end of the heat-conducting rod 403 close to the grinding head 504, thereby achieving the effect of cooling the grinding head 504, which helps to prevent the easy-to-melt plastic particles from melting during the grinding process and affecting the grinding effect.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heating structure for a plastic particle melting cylinder, comprising a melting cylinder body (1) and a heating mechanism (4) arranged on the melting cylinder body (1), characterized in that: The melting cylinder body (1) is connected to a preheating cylinder (2), and a grinding cylinder (3) is installed on the preheating cylinder (2); The grinding cylinder (3) is provided with a grinding assembly (5) for grinding plastic particles; The grinding assembly (5) comprises a motor (502) located directly above the grinding cylinder (3) and a grinding head (504) located below the motor (502); The heating mechanism (4) comprises an electric heating plate (401) mounted on the melting barrel body (1), a heat conducting rod (403) being mounted on the electric heating plate (401), a ball (405) being movably engaged at one end of the heat conducting rod (403), and an outer side of the ball (405) being in contact with the top of the grinding head (504); A second mesh heating wire (404) is installed in the preheating cylinder (2), and the heat conducting rod (403) is connected to the second mesh heating wire (404).

2. A heating structure for a plastic granule melting cylinder according to claim 1, characterized in that: A first mesh heating wire (402) is installed in the melting cylinder body (1), and the first mesh heating wire (402) is connected to the electric heating plate (401).

3. The heating structure of a plastic granule melting cylinder according to claim 1, characterized in that: The inner bottom wall of the grinding cylinder (3) is conical, and a plurality of discharge holes (505) are provided around the inner bottom wall of the grinding cylinder (3). A shaft (503) is installed at the output end of the motor (502), and the grinding head (504) is installed at the bottom end of the shaft (503). The gap between the outer side of the grinding head (504) and the grinding cylinder (3) is greater than the diameter of the plastic particles.

4. The heating structure of a plastic granule melting cylinder according to claim 1, characterized in that: A filter screen (10) is installed at the bottom of the preheating cylinder (2).

5. The heating structure of a plastic granule melting cylinder according to claim 1, characterized in that: A mounting rod (501) is mounted on the grinding cylinder (3), and the motor (502) is mounted on the mounting rod (501).

6. A heating structure for a plastic granule melting cylinder according to claim 5, characterized in that: An annular tube (6) is installed on the mounting rod (501), a plurality of air holes (7) are provided on the annular tube (6), a connecting tube (8) is connected to the annular tube (6), and a negative pressure fan (9) is installed on the connecting tube (8).

7. A heating structure for a plastic granule melting cylinder according to claim 6, characterized in that: A temperature control switch (11) is installed on the grinding cylinder (3), and the temperature control switch (11) is electrically connected to the negative pressure fan (9).

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