Heating device on injection molding machine

Abstract

The utility model discloses a heating device on an injection molding machine, which comprises a feeding barrel, an inner heat-conducting barrel body, a heating plate arranged on the inner heat-conducting barrel body and a heat-conducting plate arranged in the inner heat-conducting barrel body are arranged on the feeding barrel, the inner heat-conducting barrel body and the feeding barrel are matched to form a heating chamber, the heating plate is arranged in the heating chamber and surrounds the inner heat-conducting barrel body, and the heat-conducting plate is arranged in the heating chamber and surrounds the inner heat-conducting barrel body. The inner heat-conducting barrel body is divided into a first heating area and a second heating area by the heat-conducting plate, a plurality of communicated filter holes are formed in the heat-conducting plate, a cover plate is mounted on the feeding barrel, a heating rod mounted on the cover plate is arranged in the inner heat-conducting barrel body, and the heating rod penetrates through the heat-conducting plate and extends into the second heating area; the utility model has the beneficial effects that plastic particles can be preheated and melted when entering the feeding barrel, so that the phenomenon that the plastic particles are non-uniformly melted to block an injection molding opening when larger plastic particles enter the charging barrel is avoided, meanwhile, the plastic particles entering the charging barrel are easier to melt in the charging barrel, the plasticization completion time is shortened, and the production efficiency is improved. The working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of injection molding machines, and more specifically, to a heating device on an injection molding machine. Background Art

[0002] Injection molding machine, also known as injection molding machine or injection machine, is the main molding equipment that uses plastic molding molds to make plastic products of various shapes of thermoplastic plastics or thermosetting plastics. It is widely used in various plastic processing, and the heating device is an important part of the injection molding machine. The main function of the heating device on the injection molding machine is to melt the plastic particles and complete the plasticization, so that the subsequent injection system can apply high pressure to the molten plastic to make it ejected and fill the mold cavity. The existing heating device is mainly installed on the outside of the barrel. The heat is provided for the plasticization of the material through heat conduction through the barrel wall. The plastic particles cannot be preheated and melted when they enter the feed barrel, so that larger plastic particles entering the barrel are prone to uneven melting of the plastic and clogging the injection port. At the same time, the plastic particles in the feed barrel are not preheated and melted, and the plastic particles entering the barrel cannot be melted more easily in the barrel, which prolongs the time to complete plasticization and reduces work efficiency. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a heating device on an injection molding machine that can preheat and melt plastic particles when they enter a feed barrel, thereby preventing larger plastic particles from entering the barrel and causing uneven melting of the plastic and clogging the injection port, while making it easier for the plastic particles entering the barrel to melt in the barrel, thereby reducing the time to complete plasticization and improving work efficiency.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A heating device for an injection molding machine comprises a feed barrel, wherein the feed barrel is provided with an inner heat-conducting barrel body, a heating plate installed on the inner heat-conducting barrel body and a heat-conducting plate installed in the inner heat-conducting barrel body, the inner heat-conducting barrel body is installed in the feed barrel and cooperates with the feed barrel to form a heating chamber, the heating plate is placed in the heating chamber and surrounds the inner heat-conducting barrel body, the heat-conducting plate divides the inner heat-conducting barrel body into a first heating zone and a second heating zone, and a plurality of filter holes connecting the first heating zone and the second heating zone are opened on the heat-conducting plate.

[0006] Cover plates and discharge pipes are installed at both ends of the feed barrel, respectively. A feed pipe connected to the first heating zone is installed on the cover plate, one end of the discharge pipe is connected to the second heating zone, and the other end of the discharge pipe is connected to the barrel on the injection molding machine. A solenoid valve for controlling the opening and closing of the discharge pipe is installed on the discharge pipe.

[0007] A heating rod is arranged in the inner heat-conducting barrel, one end of the heating rod is mounted on the cover plate, and the other end of the heating rod passes through the heat-conducting plate and extends into the second heating zone.

[0008] It is further configured that a motor is installed on the cover plate, a rotating hole is opened on the cover plate and is rotatably connected to the motor shaft, the motor shaft passes through the rotating hole and extends into the first heating zone, an insulating block fixedly connected to the motor shaft is installed at one end of the heating rod, a bearing corresponding to the heating rod is passed through the heat conducting plate, the other end of the heating rod passes through the bearing and rotates in the bearing, and a first stirring plate placed in the first heating zone and a second stirring plate placed in the second heating zone are installed on the heating rod.

[0009] It is further configured that the surface of the heating rod, the first stirring blade and the second stirring blade are all provided with an anti-stick coating.

[0010] It is further configured that an aluminum silicate fiberboard with excellent heat insulation performance is provided in the heating chamber, and the aluminum silicate fiberboard is installed on the inner wall of the feed barrel.

[0011] By adopting the above technical scheme, the beneficial effects of the utility model are as follows: the plastic particles can be preheated and melted when they enter the feed barrel, thereby preventing larger plastic particles from entering the barrel and causing uneven melting of the plastic and clogging the injection port. At the same time, the plastic particles entering the barrel can be melted more easily in the barrel, thereby reducing the time to complete plasticization and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0013] Figure 2 It is a schematic diagram of the structure of the heating rod and the heat conducting plate.

[0014] In the figure: feed barrel 1, inner heat-conducting barrel body 2, heating plate 3, heat-conducting plate 4, heating chamber 5, first heating zone 6, second heating zone 7, filter hole 8, cover plate 9, feed pipe 10, feed pipe 11, solenoid valve 12, heating rod 13, motor 14, rotating hole 15, insulation block 16, bearing 17, first stirring blade 18, second stirring blade 19, aluminum silicate fiberboard 20. DETAILED DESCRIPTION

[0015] Reference Figure 1 to Figure 2 The utility model is further described in detail.

[0016] A heating device for an injection molding machine comprises a feed barrel 1, the feed barrel 1 is provided with an inner heat-conducting barrel body 2, a heating plate 3 installed on the inner heat-conducting barrel body 2, and a heat-conducting plate 4 installed in the inner heat-conducting barrel body 2, the inner heat-conducting barrel body 2 is installed in the feed barrel 1 and cooperates with the feed barrel 1 to form a heating chamber 5, the heating plate 3 is placed in the heating chamber 5 and surrounds the inner heat-conducting barrel body 2, the heat-conducting plate 4 divides the inner heat-conducting barrel body 2 into a first heating zone 6 and a second heating zone 7, and a plurality of filter holes 8 are opened on the heat-conducting plate 4 to connect the first heating zone 6 and the second heating zone 7.

[0017] A cover plate 9 and a discharge pipe 10 are respectively installed at both ends of the feed barrel 1. The cover plate 9 can be composed of an aluminum silicate fiberboard 20 with excellent thermal insulation effect to reduce the heat loss of the first heating zone 6. A feed pipe 11 connected to the first heating zone 6 is installed on the cover plate 9. One end of the discharge pipe 10 is connected to the second heating zone 7, and the other end of the discharge pipe 10 is connected to the barrel on the injection molding machine. A solenoid valve 12 for controlling the opening and closing of the discharge pipe 10 is installed on the discharge pipe 10. A heating rod 13 is provided in the inner heat-conducting barrel body 2. One end of the heating rod 13 is installed on the cover plate 9, and the other end of the heating rod 13 passes through the heat-conducting plate 4 and extends into the second heating zone 7.

[0018] Working principle: the feed barrel 1 is installed on the injection molding machine and the feed pipe 10 is connected to the barrel of the injection molding machine. The plastic particles enter the heat-conducting plate 4 in the inner heat-conducting barrel body 2 through the feed pipe 11. The solenoid valve 12 is controlled to close the feed pipe 10 to prevent the plastic particles in the inner heat-conducting barrel body 2 from directly entering the barrel of the injection molding machine without being heated. The heating plate 3 surrounding the inner heat-conducting barrel body 2 works in the heating chamber 5 to generate heat that is transferred to the inner heat-conducting barrel body 2 to facilitate preheating and melting of the plastic particles in the first heating zone 6 and the second heating zone 7. The heating rod 13 passes through the heat conducting plate 4 and extends into the second heating zone 7. When the heating rod 13 generates heat, the plastic particles in the middle of the first heating zone 6 and the second heating zone 7 in the inner heat conducting barrel 2 can be heated and melted, thereby avoiding poor heating effect on the plastic particles in the middle of the heat conducting barrel far away from the heating plate 3. The setting of the cover plate 9 can reduce the heat loss in the first heating zone 6, thereby improving the preheating and melting effect of the plastic particles in the inner heat conducting barrel 2. The filter holes 8 on the heat conducting plate 4 can be used to filter the large plastic particles. The plastic particles trapped in the first heating zone 6 continue to be heated and melted, thereby extending the heating and melting time of the large-particle plastics, preventing the large-particle plastics from falling directly into the barrel of the injection molding machine and being difficult to melt. The heat generated by the heating rod 13 and the heating plate 3 is transferred to the heat conducting plate 4, so that the heat conducting plate 4 continues to heat and melt the large-particle plastics trapped in the first heating zone 6 on the heat conducting plate 4. When the large-particle plastics are melted to the point where they can pass through the filter holes 8 on the heat conducting plate 4, they can enter the second heating zone 7 to continue to be further heated and melted, thereby further improving the preheating and melting effect of the plastic particles in the internal heat conducting barrel 2. The solenoid valve 12 on the discharge pipe 10 is controlled to open the discharge pipe 10 so that the molten plastic raw materials in the second heating zone 7 enter the barrel of the injection molding machine for further heating and melting. Finally, the plastic particles are preheated and melted when they enter the feed barrel 1, thereby preventing the large plastic particles from entering the barrel and causing uneven plastic melting to block the injection port. At the same time, the plastic particles entering the barrel are easier to melt in the barrel, thereby reducing the time to complete plasticization and improving work efficiency.

[0019] A motor 14 is mounted on the cover plate 9, a rotating hole 15 is opened on the cover plate 9 and is rotatably connected to the shaft of the motor 14, the shaft of the motor 14 passes through the rotating hole 15 and extends into the first heating zone 6, a heat insulating block 16 fixedly connected to the shaft of the motor 14 is mounted on one end of the heating rod 13, a bearing 17 corresponding to the heating rod 13 is penetrated on the heat conducting plate 4, the other end of the heating rod 13 passes through the bearing 17 and rotates in the bearing 17, a first stirring blade 18 placed in the first heating zone 6 and a second stirring blade 19 placed in the second heating zone 7 are mounted on the heating rod 13;

[0020] The operation of the motor 14 can drive the heating rod 13 to rotate, thereby stirring the plastic particles in the inner heat-conducting barrel body 2 and increasing the disorder of the plastic particles in the inner heat-conducting barrel body 2, which makes it easier for the heating rod 13 and the heating plate 3 to heat the plastic particles more evenly. The setting of the insulation block 16 can prevent the heat on the heating rod 13 from being transferred to the motor 14 to damage the motor 14, while reducing heat loss and improving the heating and melting effect of the plastic particles in the inner heat-conducting barrel body 2. The first stirring blade 18 and the second stirring blade 19 installed on the heating rod 13 rotate with the heating rod 13 to further and more fully disturb the plastic particles in the inner heat-conducting barrel body 2, so that the heating rod 13 and the heating plate 3 can heat the plastic particles in the inner heat-conducting barrel body 2 more quickly and evenly, shorten the heating and melting time of the plastic particles in the inner heat-conducting barrel body 2, and further improve work efficiency.

[0021] The surface of the heating rod 13, the first stirring blade 18 and the second stirring blade 19 are all provided with an anti-stick coating. The anti-stick coating can be a high-temperature resistant silicon nitride coating to prevent the molten plastic raw material from adhering to the heating rod 13, the first stirring blade 18 and the second stirring blade 19, causing waste of plastic raw materials and affecting the heating effect of the heating rod 13.

[0022] An aluminum silicate fiberboard 20 with excellent thermal insulation performance is provided in the heating chamber 5. The aluminum silicate fiberboard 20 is installed on the inner wall of the feed barrel 1 to reduce the heat generated by the heating plate 3 in the heating chamber 5 from being dissipated to the external environment through the feed barrel 1, thereby avoiding the heating effect of the heating plate 3 on the plastic particles inside the inner heat-conducting barrel body 2 being reduced and affecting the work efficiency.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any common changes and substitutions made by those skilled in the art within the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A heating device for an injection molding machine, comprising a feed barrel (1), characterized in that: The feed barrel (1) is provided with an inner heat-conducting barrel body (2), a heating plate (3) mounted on the inner heat-conducting barrel body (2), and a heat-conducting plate (4) mounted in the inner heat-conducting barrel body (2); the inner heat-conducting barrel body (2) is mounted in the feed barrel (1) and cooperates with the feed barrel (1) to form a heating chamber (5); the heating plate (3) is placed in the heating chamber (5) and surrounds the inner heat-conducting barrel body (2); the heat-conducting plate (4) divides the inner heat-conducting barrel body (2) into a first heating zone (6) and a second heating zone (7); the heat-conducting plate (4) is provided with a plurality of filter holes (8) connecting the first heating zone (6) and the second heating zone (7); A cover plate (9) and a discharge pipe (10) are respectively installed at both ends of the feed barrel (1); a feed pipe (11) connected to the first heating zone (6) is installed on the cover plate (9); one end of the discharge pipe (10) is connected to the second heating zone (7); the other end of the discharge pipe (10) is connected to the barrel on the injection molding machine; and a solenoid valve (12) for controlling the opening and closing of the discharge pipe (10) is installed on the discharge pipe (10). A heating rod (13) is provided in the inner heat-conducting barrel (2); one end of the heating rod (13) is mounted on the cover plate (9), and the other end of the heating rod (13) passes through the heat-conducting plate (4) and extends into the second heating zone (7).

2. A heating device for an injection molding machine according to claim 1, characterized in that: The cover plate (9) is provided with a motor (14), the cover plate (9) is provided with a rotation hole (15) rotatably connected to the shaft of the motor (14), the shaft of the motor (14) passes through the rotation hole (15) and extends into the first heating zone (6), one end of the heating rod (13) is provided with a heat insulation block (16) fixedly connected to the shaft of the motor (14), the heat conducting plate (4) is provided with a bearing (17) corresponding to the heating rod (13), the other end of the heating rod (13) passes through the bearing (17) and rotates in the bearing (17), and the heating rod (13) is provided with a first stirring plate (18) placed in the first heating zone (6) and a second stirring plate (19) placed in the second heating zone (7).

3. A heating device for an injection molding machine according to claim 2, characterized in that: An anti-stick coating is provided on the surface of the heating rod (13), the first stirring blade (18) and the second stirring blade (19).

4. A heating device for an injection molding machine according to claim 3, characterized in that: An aluminum silicate fiberboard (20) having excellent heat insulation performance is arranged in the heating chamber (5), and the aluminum silicate fiberboard (20) is installed on the inner wall of the feed barrel (1).

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