TWM601180U - Two-stage ejection machine - Google Patents

Abstract

A two-stage injection machine, suitable for processing and injection of plastic particles, and includes a feeding mechanism for conveying and heating the plastic particles into molten plastic, and an injection mechanism for injecting the molten plastic A driving mechanism, and an injection feeding mechanism for guiding the molten plastic from the feeding mechanism into the injection driving mechanism. The feeding mechanism includes a pressurizing device for pressurizing and mixing inert gas into the molten plastic. Due to the two-stage design of the feeding mechanism and the injection drive mechanism, the injection drive mechanism does not affect the mixing of the molten plastic and the inert gas in the feeding mechanism during the injection action and generates bubbles in the feeding mechanism. The uniformity of bubbles in the molten plastic improves the yield of the final product.

Description

Two-stage injection machine

The new model relates to a plastic processing equipment, in particular to an injection machine for plastic processing and injection.

The injection molding equipment currently used for injection molding of plastic particles generally includes a feed pipe provided with a feed port for the plastic particles to be input, and a feed pipe that passes through the feed pipe and can be driven for use. A screw for conveying the plastic particles, a heating device arranged in the conveying pipe and used to heat the plastic particles into molten plastic, a pressurizing device connected to the conveying pipe and used to input inert gas, and A communicating group is connected to a discharging device with a reduced diameter at one end of the feeding pipe away from the feeding pipe. The discharging device is provided with a discharging port for ejecting the molten plastic.

The plastic particles enter the feeding pipe through the feeding port, and are driven by the screw to move in the feeding pipe toward the direction of the discharging device, and are heated by the heating device during the movement to become the molten Shaped plastic. At the same time, the inert gas is pressurized and mixed into the molten plastic through the pressurizing device, so that the molten plastic is filled with bubbles, so that the final product has a foaming effect. The injection molding equipment must first stop driving the screw to inject the molten plastic every time, and stop the injection of the plastic particles into the feed port, and then drive the screw to move in the direction of the discharge device and melt the melt The shaped plastic is extruded from the discharge device and ejected from the discharge port. Because the forward movement of the screw will cause the relative position of the screw and the pressurizing device to change instantaneously, resulting in the uneven distribution and size of the bubbles generated by the inert gas injected into the molten plastic, resulting in the quality of the final product Poor and low yield.

Therefore, the purpose of the present invention is to provide a two-stage injection machine that can overcome at least one of the disadvantages of the prior art.

Therefore, the new two-stage injection machine is suitable for processing and injection of plastic particles, and includes a feeding mechanism, an injection driving mechanism, and an injection feeding mechanism.

The feeding mechanism includes a feeding unit for conveying the plastic particles in the direction of one of its discharge ports, and a feeding unit installed in the feeding unit and used for heating the plastic particles in the feeding unit into A heating unit for molten plastic and a pressurizing device connected to the feeding unit and used to pressurize inert gas into the feeding unit. The injection driving mechanism includes a material storage tube with an extrusion port, and an injection unit movably inserted in the material storage tube. The injection unit can be driven between a waiting position where the storage tube can be used to contain the molten plastic, and an injection position where the molten plastic in the storage tube is extruded toward the extrusion port Variety. The injection and feeding mechanism includes a communication seat connecting the discharge port and the extrusion port, and a non-reversal unit installed on the communication seat. The communication seat has an injection device for outputting the molten plastic from the extrusion port. Outlet, the non-return unit can be driven to change between an open position connecting the discharge port and the extrusion port, and a closed position blocking the communication state of the discharge port and the extrusion port.

The effect of the present invention is that by the two-stage design of the feeding mechanism and the injection drive mechanism, the injection drive mechanism does not affect the mixing of the molten plastic and the inert gas in the feeding mechanism during the injection action. And generate bubbles in it, maintain the uniformity of the bubbles in the molten plastic, and improve the yield of the final product.

1~3, an embodiment of the two-stage injection machine 1 of the present invention is suitable for processing and injecting plastic particles, and includes a base 3, a feeding mechanism 4, and a feeding mechanism arranged on the base 3. An injection driving mechanism 5 arranged on the base 3 and located below the feeding mechanism 4, and an injection feeding mechanism 6 connected between the feeding mechanism 4 and the front end of the injection driving mechanism 5.

The feeding mechanism 4 includes a feeding unit 41 for conveying the plastic particles, and a heating unit arranged on the feeding unit 41 and used for heating the plastic particles conveyed by the feeding unit 41 into molten plastic. 42, and a pressurizing device 43 connected to the feeding unit 41 and used for pressurizing inert gas into the feeding unit 41. The feeding unit 41 has a feeding tube 411 that extends horizontally back and forth, and a coaxially inserted feeding tube 411 that can be driven to cooperate with the feeding tube 411 to convey the injection and feeding mechanism 6 direction. The screw 412 of the plastic pellets, and a driving device 413 located behind the feeding pipe 411 and connected to the screw 412 for driving the screw 412. The outer peripheral surface of the rear section of the feeding pipe 411 is radially provided with an inlet 401 for the input of the plastic particles, and the front end of the feeding pipe 411 is provided with an outlet 402 for discharging the molten plastic.

The heating unit 42 has a plurality of electric heating elements 421 that are wrapped around the outer peripheral surface of the conveying pipe 411 and can be driven to generate heat to heat the plastic particles in the conveying pipe 411. Since the heating unit 42 is provided on the periphery of the feeding pipe 411 to heat the plastic particles is a prior art and there are many methods, it will not be described in detail. The pressurizing device 43 is connected to the feeding pipe 411 and used to inject inert gas into the feeding pipe 411 to mix the inert gas with the molten plastic and fill the molten plastic with bubbles.

The injection driving mechanism 5 includes a storage tube 51 for accommodating the molten plastic, and an injection unit 52 arranged on the base 3 and installed at the rear end of the storage tube 51. The front end of the storage tube 51 is provided with an extrusion port 510 for extruding the molten plastic. The injection unit 52 has an injection rod 521 that can be moved forwards and backwards and airtightly inserted in the storage tube 51, and a driving device 522 installed on the base 3 and connected to the rear end of the injection rod 521. The driving device 522 can drive the injection rod 521 to move back and forth between a waiting position and an injection position relative to the storage tube 51. When the injection rod 521 is in the waiting position, the front end of the injection rod 521 is far away from the extrusion port 510, so that the storage tube 51 is formed with a space between the extrusion port 510 and the injection rod 521 and can accommodate the molten state. The plastic storage space 520. When the injection rod 521 is at the injection position, the front end of the injection rod 521 penetrates the extrusion opening 510 forward, and the molten plastic contained in the storage space 520 can be extruded The outlet 510 is squeezed out. In this embodiment, the driving device 522 is a hydraulic cylinder, but in implementation, because there are many types of the driving device 522 used to drive the injection rod 521 to move between two positions, it is not limited to the above aspect.

2 to 5, the injection and feeding mechanism 6 includes a communicating seat 61 that bridges the front end of the feeding pipe 411 and the storage pipe 51, a non-return unit 62 arranged on the communicating seat 61, and a communicating seat 61 The non-reverse injection nozzle device 63 on the front side of the communication seat 61. The communication seat 61 is provided with a communication channel 601 extending up and down and communicating with the discharge port 402 with its top end, an injection channel 602 extending back and forth through and communicating with the bottom end of the communication channel 601 and coaxially communicating with the extrusion port 510, and a left and right The non-return passage 605 at the bottom end of the communication passage 601 extends to the left. The injection channel 602 has a frusto-conical connecting section 603 that gradually decreases in diameter from the extrusion port 510 to the direction of the non-reverse injection nozzle device 63, and a connecting section 603 that extends forward equidistantly from the front end of the connecting section 603 to communicate with the stop. The small aperture section 604 of the reverse injection nozzle device 63 makes the molten plastic squeeze from the extrusion port 510 to the non-reverse injection nozzle device 63 and will be pressurized through the injection channel 602 with a reduced diameter, which is advantageous Then the molten plastic is injected into the mold.

The non-return unit 62 has a non-return rod 621 inserted in the non-return channel 605 so as to move left and right, and a right end of the non-return rod 621 to drive the non-reverse rod 621 relative to the communicating seat 61 A power unit 622 that moves between an open position and a closed position. When the non-return rod 621 is in the open position, the communication channel 601 communicates with the injection channel 602, so that the communication channel 601 can be used to transport the molten plastic flowing out of the outlet 402 through the injection channel 602 for injection In the storage space 520 of the storage tube 51; when the check rod 621 is in the closed position, the check rod 621 is inserted into the communication channel 601 to the left and blocks the communication channel 601 so as to exit from the The molten plastic flowing out of the material port 402 cannot enter the material storage space 520.

The non-reverse injection nozzle device 63 can be controlled to open to inject the molten plastic from the injection channel 602 out of the non-reverse injection nozzle device 63. Since the non-reverse injection nozzle device 63 is a conventional component, it will not be detailed Narrated.

When the two-stage injection machine 1 of the present invention is used, the plastic particles enter the feeding pipe 411 of the feeding unit 41 through the feeding port 401, and are driven by the screw 412 toward the outlet 402. The plastic particles are continuously heated by the heating unit 42 to become the molten plastic during the process of moving to the discharge port 402. At the same time, the inert gas input into the feeding pipe 411 through the pressurizing device 43 will also be pressurized and mixed into the molten plastic, so that the molten plastic is filled with bubbles, which can be subsequently injected into the mold to produce Porous foam products.

The two-stage injection machine 1 will alternately operate between a feeding stage and an injection stage. During the feeding stage, the driving device 413 drives the screw 412 so that the molten plastic can flow in the feeding pipe In 411, driven by the screw 412 and moving to the discharge port 402, the non-return rod 621 will be driven in the open position, and the injection rod 521 will be driven in the waiting position, causing the storage tube 51 to generate the The material storage space 520, and the non-reverse injection nozzle device 63 is driven to close. At this time, the molten plastic from the feed pipe 411 will be injected into the communicating seat 61 through the discharge port 402 and flow in the direction of the extrusion port 510, and finally injected into the storage space 520 of the storage pipe 51.

When the molten plastic fills the storage tube 51, the two-stage injection machine 1 will switch to the injection stage, and the driving device 413 stops driving the screw 412, so that the molten plastic suspends to the discharge The port 402 moves in the direction, and the non-return rod 621 is driven to move to the closed position, so that the communication channel 601 is blocked and the molten plastic is stopped from being injected into the storage tube 51, and then the non-reverse injection nozzle device 63 Is driven to open, and then the injection rod 521 is driven to move to the injection position, and the molten plastic located in the storage space 520 is squeezed forward into the injection channel 602, and is injected through the non-reverse injection nozzle device 63 . During the injection phase, since the non-return rod 621 blocks the communication channel 601 connecting the discharge port 402 and the extrusion port 510, the molten plastic can be pushed forward into the stop by the injection rod 521 When the back-injection nozzle device 63 is used, the molten plastic is prevented from flowing back to the feeding pipe 411 through the communication channel 601.

When the two-stage injection machine 1 is switched to the feeding stage again, the injection rod 521 is driven back to the waiting position, and during its movement, there will be generated in the communication channel 601 and the storage tube 51 A negative suction force causes the molten plastic located in the communication channel 601 to be quickly sucked into the storage tube 51. When the storage space 520 is filled with the molten plastic again, the two-stage injection machine 1 will switch to the injection stage again to perform the next injection operation.

In this embodiment, the feeding mechanism 4 is arranged above the injection driving mechanism 5. However, during implementation, in other embodiments of the present invention, the feeding mechanism 4 and the injection driving mechanism 5 are not arranged in this way For limitation, it can also be set on the same horizontal plane. On the other hand, the electric heating elements 421 of this embodiment wrap around the periphery of the feeding tube 411 of the feeding mechanism 4. However, in implementation, in other embodiments of the present invention, the electric heating elements The element 421 can also be arranged on the periphery of the storage tube 51 of the injection driving mechanism 5 or on the periphery of the communicating seat 61 and the non-reverse injection nozzle device 63 of the injection feeding mechanism 6.

In summary, through the two-stage structure design of the feeding mechanism 4 and the injection driving mechanism 5, when the injection driving mechanism 5 injects the molten plastic, it will not affect the feeding tube 411. The molten plastic is mixed with inert gas to make the bubble distribution and size in the molten plastic more uniform, improve the quality of the final product, and increase the yield of the output. It is a very practical and novel two-stage injection Machine 1.

However, the above-mentioned are only examples of the present model, and should not be used to limit the scope of implementation of the present model, all simple equivalent changes and modifications made in accordance with the patent scope of the present model application and the contents of the patent specification still belong to This new patent covers the scope.

1: Two-stage injection machine

3: Pedestal

4: Feeding mechanism

401: Inlet

402: Outlet

41: Conveying unit

411: Feed Pipe

412: Screw

413: Drive Device

42: heating unit

421: electric heating element

43: pressure device

5: Injection drive mechanism

51: storage tube

510: Extrusion port

52: Injection unit

520: storage space

521: Shot Rod

522: Drive

6: Injection feeding mechanism

601: Connecting channel

602: Injection Channel

603: connection segment

604: small aperture section

605: check channel

61: Connecting seat

62: check unit

621: check lever

622: Power Plant

63: Non-return nozzle device

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a top cross-sectional view illustrating an embodiment of the new two-stage injection machine; Figure 2 is a side cross-sectional view illustrating a waiting position of an injection rod of this embodiment; Figure 3 is an incomplete cross-sectional side view illustrating the injection rod of the embodiment in an injection position; Figure 4 is an incomplete top cross-sectional view illustrating a non-return lever of this embodiment in an open position; and Figure 5 is an incomplete top cross-sectional view illustrating the non-return lever of the embodiment in a closed position.

1: Two-stage injection machine

3: Pedestal

4: Feeding mechanism

401: Inlet

402: Outlet

41: Conveying unit

411: Feed Pipe

412: Screw

413: Drive Device

42: heating unit

421: electric heating element

43: pressure device

5: Injection drive mechanism

51: storage tube

510: Extrusion port

52: Injection unit

520: storage space

521: Shot Rod

522: Drive

6: Injection feeding mechanism

601: Connecting channel

602: Injection Channel

603: connection segment

604: small aperture section

61: Connecting seat

621: check lever

63: Non-return nozzle device

Claims (6)

A two-stage injection machine, suitable for processing and injecting plastic particles, and includes: a feeding mechanism, including a feeding unit for conveying the plastic particles toward one of the outlets, and a A heating unit for heating the plastic particles conveyed by the conveying unit into molten plastic, and a heating unit connected to the conveying unit and used to inject inert gas into the conveying unit under pressure Pressurizing device; an injection drive mechanism, including a storage tube with an extrusion port, and an injection unit movably inserted in the storage tube, the injection unit can be driven to make the storage The tube can be used to accommodate the waiting position of the molten plastic, and an injection position for extruding the molten plastic in the storage tube toward the extrusion port; and an injection feeding mechanism including a communication with the outlet A communication seat between the material port and the extrusion port, a non-return nozzle device installed on the communication seat and used to inject the molten plastic extruded from the extrusion port, and a non-return unit installed on the communication seat, The non-return unit can be driven to an open position that allows the discharge port to communicate with the extrusion port, and to block the communication between the discharge port and the extrusion port so that the molten plastic can be squeezed toward the The non-return nozzle device changes between the closed positions. The two-stage injection machine according to claim 1, wherein the communication seat defines a communication channel connecting the discharge port, an injection channel connecting the extrusion port and the non-return nozzle device and connecting the communication channel , The injection channel has a truncated cone that gradually decreases in diameter from the extrusion port to the direction of the non-reverse injection nozzle device The connecting section is shaped like a connecting section, and a small aperture section extending from the diameter-reduced end of the connecting section to the non-return nozzle device. The two-stage injection machine according to claim 2, wherein the communicating seat further defines a non-return passage communicating with the communicating passage, and the non-return unit has a non-return rod inserted in the non-return passage, and A power device connected to the non-return rod, the power device can be used to drive the non-return rod to an open position that allows the communication channel to communicate with the injection channel, and a power device that blocks the communication between the communication channel and the injection channel Move between the closed positions. The two-stage injection machine according to claim 1, 2 or 3, wherein the injection unit has an injection rod arranged in the storage tube, and a connection with the injection rod and used to drive the injection rod in the waiting The driving device that moves between the position and the injection position. The two-stage injection machine according to claim 4, wherein the feeding unit has a feeding pipe, a screw threaded in the feeding pipe, and a screw connected to the screw and used to drive the screw to rotate Drive device. According to the two-stage injection molding machine described in claim 5, the pressurizing device is connected and installed in the feeding pipe, and is used to pressurize inert gas into the feeding pipe.

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