Injection molding machine

Abstract

An injection molding machine disclosed by the present invention comprises an injection molding machine main body, an injection mold, a main material storage tank, a material preheating mechanism and a fan, the output end of the injection molding machine main body is provided with the injection mold, a heating zone of the injection molding machine main body is provided with a heat insulation shell, and a circulation cavity is arranged between the heat insulation shell and the heating zone of the injection molding machine main body; the upper end of the material preheating mechanism is provided with a main material storage tank for supplying materials into the material preheating mechanism, the material output end of the material preheating mechanism is communicated with a material inlet of the injection molding machine main body, and an air outlet of the material preheating mechanism is communicated with the rear part of the circulation cavity through a pipeline; and an air inlet of the material preheating mechanism communicates with the front portion of the circulation cavity through a draught fan, the injection mold comprises a mold body, the mold body is provided with an injection molding opening mechanism and an exhaust mechanism, and the injection molding opening mechanism comprises an injection molding opening, a communicating opening, a material pushing piston and a driving mechanism I. Compared with the prior art, the manual workload can be reduced, and the production efficiency is improved. The production efficiency and the heat energy utilization rate are improved.

Description

[Technical field]

[0001] The invention relates to the technical field of injection molding, in particular to an injection molding machine. [Background technology]

[0002] Plastic is a polymer compound made of monomers through addition polymerization or condensation polymerization, commonly known as plastic or resin, which can freely change its composition and shape. Injection molding machine is also known as injection molding machine or injection machine. It is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastic plastics or thermosetting plastics. The injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it ejected and fill the mold cavity.

[0003] During the filling process of the mold, the gas in the mold cavity needs to overflow from the mold pores, otherwise the injection molded product will be scrapped due to insufficient injection. Therefore, the mold needs to be equipped with some exhaust devices to ensure that the plastic product with a good appearance is obtained. It is difficult for the gas to overflow during the filling process of a mold with high precision and good sealing. Generally, exhaust holes need to be added to the places where it is easy to hold air during mold manufacturing. Although this method can effectively solve the problem of plastic filling, the mold cavity, pouring port and exhaust hole will be filled with plastic. In this way, after the injection molded product is formed, the molded part of the pouring port and the exhaust hole needs to be removed manually as a whole with the product. Due to manual operation, the manual workload is increased and the production efficiency is reduced.

[0004] The existing injection molding machines are not perfect, especially in terms of heat loss. Specifically, the injection molding machine will emit a large amount of heat to the surrounding air during operation, which will increase the temperature of the surrounding air and lead to a waste of heat. [Summary of the invention]

[0005] The purpose of the present invention is to solve the problems in the prior art and to provide an injection molding machine that can reduce manual workload, improve production efficiency, and increase thermal energy utilization.

[0006] To achieve the above-mentioned purpose, the present invention proposes an injection molding machine, comprising an injection molding machine body, an injection mold, a main material storage tank, a material preheating mechanism and a fan, wherein the output end of the injection molding machine body is provided with an injection mold, the heating zone of the injection molding machine body is provided with a heat insulation shell, a circulation cavity is provided between the heat insulation shell and the heating zone of the injection molding machine body, the upper end of the material preheating mechanism is provided with a main material storage tank for feeding material therein, the material output end of the material preheating mechanism is connected with the feed inlet of the injection molding machine body, the air outlet of the material preheating mechanism is connected with the rear part of the circulation cavity through a pipeline, the air inlet of the material preheating mechanism is connected with the front part of the circulation cavity through the fan, the injection mold comprises a mold body, and the mold body An injection port mechanism and an exhaust mechanism are provided on the mold, the injection port mechanism includes an injection port, a connecting port, a pushing piston and a driving mechanism I, the connecting port is connected with the injection port, a pushing piston is provided in the connecting port, the connecting port is provided with a driving mechanism I for driving the pushing piston to enter the injection port, the pushing piston pushes the hot melt plastic in the injection port into the mold body, the exhaust mechanism includes a cover body, a vacuum pump, a blocking piston, a driving mechanism II, an exhaust hole I and an exhaust hole II, the exhaust hole I is connected with the internal space of the cover body through the exhaust hole II, the cover body is provided with a driving mechanism II, the driving mechanism II is provided with a blocking piston located in the rear end of the exhaust hole I, and the input end of the vacuum pump is connected with the cover body.

[0007] Preferably, the driving mechanism I comprises a sealing cover, an air supply pipe and a three-way valve, and the air supply pipe is connected to the sealing cover through the three-way valve.

[0008] Preferably, the pushing piston comprises a piston body and a tension spring, and the piston body is fixedly connected to the sealing cover via the tension spring.

[0009] Preferably, the piston body comprises a bendable elastic body, a piston head and a reinforcing plate, the lower end of the bendable elastic body is provided with a piston head matching the injection port, and the upper end of the bendable elastic body is provided with a reinforcing plate fixedly connected to the tension spring.

[0010] Preferably, a sensor is provided on the communication port, and a sensed body matching the sensor is provided on the flexible elastic body.

[0011] Preferably, a bendable elastic support body is provided in the bendable elastic main body, and two ends of the bendable elastic support body are fixedly connected to the piston head and the reinforcing plate respectively.

[0012] Preferably, the bendable elastic main body is made of rubber material, and the bendable elastic support body is a soft shaft.

[0013] Preferably, the diameters of the communication port and the injection port are equal, the diameter of the bendable elastic body is equal to the diameter of the injection port, or the diameter of the bendable elastic body is slightly larger than the diameter of the injection port.

[0014] Preferably, the connection between the communication port and the injection port is an arc transition section, and the mold body is provided with a funnel-shaped interface connected to the arc transition section.

[0015] Preferably, the material preheating mechanism comprises a preheating tank, an air inlet is provided on one side of the lower end of the preheating tank, an output end of the air inlet is provided with a main air pipe located in the preheating tank, a plurality of rows of jet pipes are provided on the main air pipe, the jet pipes of the upper and lower adjacent rows are staggered, a plurality of jet ports are provided on the jet pipes, and an air outlet is provided on one side of the upper end of the preheating tank.

[0016] Beneficial effects of the present invention: the present invention is provided with a driving mechanism I on the connecting port for driving a pushing piston to enter the injection port, and the pushing piston pushes the hot-melt plastic in the injection port into the mold body; the driving mechanism II drives a blocking piston to enter the exhaust hole I to block it, thereby preventing the hot-melt plastic from entering the exhaust hole I, and utilizes the heat emitted from the heating zone of the injection molding machine body to preheat the material through the material preheating mechanism. Compared with the prior art, it can reduce manual workload, improve production efficiency, and improve thermal energy utilization.

[0017] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0018] Figure 1 It is a structural schematic diagram of an injection molding machine of the present invention;

[0019] Figure 2 It is a structural diagram of an injection mold.

[0020] In the figure: 1-injection molding machine body, 2-injection mold, 3-main storage tank, 4-material preheating mechanism, 5-fan, 6-insulation shell, 7-circulation cavity, 21-mold body, 22-injection port mechanism, 23-exhaust mechanism, 221-injection port, 222-connecting port, 223-push piston, 224-driving mechanism I, 225-funnel-shaped interface, 226-sensor, 227-sensed body, 228- Bendable elastic support body, 231-cover body, 232-vacuum pump, 233-sealing piston, 234-driving mechanism II, 235-exhaust hole I, 236-exhaust hole II, 2231-piston body, 2232-tension spring, 2241-sealing cover, 2242-air supply pipe, 2243-three-way valve, 22311-bendable elastic body, 22312-piston head, 22313-reinforcement plate. [Specific implementation method]

[0021] See also Figure 1 , 2The present invention discloses an injection molding machine, comprising an injection molding machine body 1, an injection mold 2, a main material storage tank 3, a material preheating mechanism 4 and a fan 5. The output end of the injection molding machine body 1 is provided with an injection mold 2, the heating zone of the injection molding machine body 1 is provided with a heat insulation shell 6, and a circulation cavity 7 is provided between the heat insulation shell 6 and the heating zone of the injection molding machine body 1. The upper end of the material preheating mechanism 4 is provided with a main material storage tank 3 for feeding material therein, the material output end of the material preheating mechanism 4 is communicated with the material inlet of the injection molding machine body 1, the air outlet 41 of the material preheating mechanism 4 is communicated with the rear part of the circulation cavity 7 through a pipeline, and the air inlet 42 of the material preheating mechanism 4 is communicated with the front part of the circulation cavity 7 through the fan 5. The injection mold 2 comprises a mold body 21, and an injection port mechanism 22 and an exhaust mechanism 23 are provided on the mold body 21. The injection port mechanism 22 comprises an injection port 221, a communication port 2 22. A pushing piston 223 and a driving mechanism I224. The connecting port 222 is connected with the injection port 221. A pushing piston 223 is arranged in the connecting port 222. A driving mechanism I224 for driving the pushing piston 223 to enter the injection port 221 is arranged on the connecting port 222. The pushing piston 223 pushes the hot melt plastic in the injection port 221 into the mold body 21. The exhaust mechanism 23 includes a cover body 231, a vacuum pump 232, a blocking piston 233, a driving mechanism II234, an exhaust hole I235 and an exhaust hole II236. The exhaust hole I235 is connected with the internal space of the cover body 231 through the exhaust hole II236. The cover body 231 is provided with a driving mechanism II234. The driving mechanism II234 is provided with a blocking piston 233 located in the rear end of the exhaust hole I235. The input end of the vacuum pump 232 is connected with the cover body 231.

[0022] The driving mechanism I224 includes a sealing cover 2241, an air supply pipe 2242 and a three-way valve 2243, and the air supply pipe 2242 is connected to the sealing cover 2241 through the three-way valve 2243.

[0023] The pushing piston 223 includes a piston body 2231 and a tension spring 2232 , and the piston body 2231 is fixedly connected to the sealing cover 2241 via the tension spring 2232 .

[0024] The piston body 2231 includes a flexible elastic main body 22311, a piston head 22312 and a reinforcing plate 22313. The lower end of the flexible elastic main body 22311 is provided with a piston head 22312 that matches the injection port 221, and the upper end of the flexible elastic main body 22311 is provided with a reinforcing plate 22313 fixedly connected to the tension spring 2232.

[0025] The communication port 222 is provided with a sensor 226 , and the bendable elastic body 22311 is provided with a sensed body 227 matching the sensor 226 .

[0026] A flexible elastic support body 228 is provided in the flexible elastic main body 22311 , and two ends of the flexible elastic support body 228 are fixedly connected to the piston head 22312 and the reinforcing plate 22313 respectively.

[0027] The bendable elastic body 22311 is made of rubber material, and the bendable elastic support body 228 is a soft shaft.

[0028] The diameters of the communication port 222 and the injection port 221 are equal, and the diameter of the bendable elastic body 22311 is equal to the diameter of the injection port 221 or the diameter of the bendable elastic body 22311 is slightly larger than the diameter of the injection port 221 .

[0029] The connection between the communication port 222 and the injection port 221 is an arc transition section, and the mold body 21 is provided with a funnel-shaped interface 225 communicating with the arc transition section.

[0030] The material preheating mechanism 4 includes a preheating tank 43, an air inlet 42 is provided on one side of the lower end of the preheating tank 43, and a main air pipe 44 located in the preheating tank 43 is provided at the output end of the air inlet 42, and a plurality of rows of air injection pipes 45 are provided on the main air pipe 44, and the air injection pipes 45 in two adjacent rows are staggered, and a plurality of air injection ports are provided on each of the air injection pipes 45, and an air outlet 41 is provided on one side of the upper end of the preheating tank 43.

[0031] Working process of the present invention:

[0032] During the operation of the injection molding machine of the present invention, the vacuum pump 232 is started, and the air in the mold body 21 enters the cover body 231 through the exhaust hole I235 and the exhaust hole II236 in turn, and is finally discharged through the vacuum pump 232. When the vacuum degree in the mold body 21 reaches a certain value, the drive mechanism II234 can use an electric push rod, and the drive mechanism II234 is started to push the blocking piston 233 to move forward until the front end of the blocking piston 233 is flush with the front end of the exhaust hole I235, and then the vacuum pump 232 is stopped and the electric valve on its input end is closed, and then the injection molding machine injects air into the mold body 21. The hot melt material is injected into the mold body 21, and the hot melt material enters the mold body 21 through the funnel-shaped interface 225 and the injection port 221 in sequence. After the hot melt material is injected, the hot melt material injection is stopped, and then the three-way valve 2243 is adjusted to make the air supply pipe 2242 communicate with the sealing cover 2241, and the gas enters the connecting port 222. The piston body 2231 enters the injection port 221 under the action of air pressure to push the hot melt material inside into the mold body 21. When the sensor 226 senses the sensed body 227, the piston body 2231 is flush with the rear end of the injection port 221, and the air supply valve on the air supply pipe is closed. Before the product is demoulded, the three-way valve 2243 is adjusted to make the sealing cover 2241 communicate with the outside world. At this time, the gas in the connecting port 222 is discharged, and the piston body 2231 returns to its position under the pull of the tension spring 2232, and then the product demoulding operation can be performed.

[0033] The hot air in the circulation chamber 7 passes through the air inlet 42 and the main air pipe 44 in sequence through the fan 5, and finally is ejected from the jet pipe 45 to preheat the material, and then re-enters the circulation chamber 7 through the air outlet 41. The fan 5 is provided with a heating function.

[0034] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. An injection molding machine, characterized in that: The invention comprises an injection molding machine body (1), an injection mold (2), a main material storage tank (3), a material preheating mechanism (4) and a fan (5), wherein the output end of the injection molding machine body (1) is provided with an injection mold (2), the heating zone of the injection molding machine body (1) is provided with a heat insulation shell (6), a flow cavity (7) is provided between the heat insulation shell (6) and the heating zone of the injection molding machine body (1), the upper end of the material preheating mechanism (4) is provided with a main material storage tank (3) for supplying material therein, the material output end of the material preheating mechanism (4) is connected to the injection molding machine body (1) and the heating zone of the injection molding machine body (1 ... The material preheating mechanism (4) is connected to the material inlet of the molding machine body (1), the air outlet (41) of the material preheating mechanism (4) is connected to the rear part of the circulation cavity (7) through a pipeline, the air inlet (42) of the material preheating mechanism (4) is connected to the front part of the circulation cavity (7) through a fan (5), the injection mold (2) comprises a mold body (21), the mold body (21) is provided with an injection port mechanism (22) and an exhaust mechanism (23), the injection port mechanism (22) comprises an injection port (221), a communication port (222), a push port (23) and a push port (23). The connecting port (222) is connected to the injection port (221), a pushing piston (223) is arranged in the connecting port (222), a driving mechanism I (224) for driving the pushing piston (223) to enter the injection port (221) is arranged on the connecting port (222), the pushing piston (223) pushes the hot melt plastic in the injection port (221) into the mold body (21), and the exhaust mechanism (23) includes a cover body (231), a vacuum pump (231), and a vacuum pump (232). 2), a blocking piston (233), a driving mechanism II (234), an exhaust hole I (235) and an exhaust hole II (236), wherein the exhaust hole I (235) is connected to the internal space of the cover body (231) through the exhaust hole II (236), the cover body (231) is provided with a driving mechanism II (234), and the driving mechanism II (234) is provided with a blocking piston (233) located at the rear end of the exhaust hole I (235), and the input end of the vacuum pump (232) is connected to the cover body (231).

2. An injection molding machine according to claim 1, characterized in that: The driving mechanism I (224) comprises a sealing cover (2241), an air supply pipe (2242) and a three-way valve (2243), and the air supply pipe (2242) is connected to the sealing cover (2241) via the three-way valve (2243).

3. An injection molding machine as claimed in claim 2, characterized in that: The pushing piston (223) comprises a piston body (2231) and a tension spring (2232), and the piston body (2231) is fixedly connected to the sealing cover (2241) via the tension spring (2232).

4. An injection molding machine as claimed in claim 3, characterized in that: The piston body (2231) includes a bendable elastic main body (22311), a piston head (22312) and a reinforcing plate (22313); the lower end of the bendable elastic main body (22311) is provided with a piston head (22312) that matches the injection port (221); the upper end of the bendable elastic main body (22311) is provided with a reinforcing plate (22313) that is fixedly connected to the tension spring (2232).

5. An injection molding machine as claimed in claim 4, characterized in that: The communication port (222) is provided with a sensor (226), and the bendable elastic body (22311) is provided with a sensed body (227) matching the sensor (226).

6. An injection molding machine as claimed in claim 4, characterized in that: A bendable elastic support body (228) is provided inside the bendable elastic main body (22311), and two ends of the bendable elastic support body (228) are fixedly connected to the piston head (22312) and the reinforcing plate (22313), respectively.

7. An injection molding machine according to claim 6, characterized in that: The bendable elastic body (22311) is made of rubber material, and the bendable elastic support body (228) is a soft shaft.

8. An injection molding machine as claimed in claim 3, characterized in that: The diameter of the communication port (222) is equal to that of the injection port (221), and the diameter of the bendable elastic body (22311) is equal to that of the injection port (221), or the diameter of the bendable elastic body (22311) is slightly larger than the diameter of the injection port (221).

9. An injection molding machine according to claim 1, characterized in that: The connection between the communication port (222) and the injection port (221) is an arc transition section, and the mold body (21) is provided with a funnel-shaped interface (225) communicating with the arc transition section.

10. An injection molding machine according to any one of claims 1 to 9, characterized in that: The material preheating mechanism (4) comprises a preheating material tank (43), an air inlet (42) is provided on one side of the lower end of the preheating material tank (43), a main air pipe (44) located in the preheating material tank (43) is provided at the output end of the air inlet (42), a plurality of rows of air jet pipes (45) are provided on the main air pipe (44), the air jet pipes (45) in two adjacent rows are staggered, and a plurality of air jet ports are provided on each of the air jet pipes (45), and an air outlet (41) is provided on one side of the upper end of the preheating material tank (43).

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