TWI614115B - Feeding device of an injection molding machine - Google Patents

Abstract

The feeding device of the injection molding machine comprises a feeding tube, a screw and a driving mechanism. The feeding tube is formed with a feeding hole and a conveying hole. The screw is inserted into the conveying hole and can rotate around a first axis. The screw is used for controlling the circulation and blocking of the feed hole. The drive mechanism comprises a connecting assembly, a cam member and a driving motor. The connecting assembly is fixedly connected to the screw and can drive the screw to move along the first axis. Forming a pushing member, the cam member is rotatable about a second axis perpendicular to the first axis, the cam member is formed with a guiding groove for engaging the pushing member, and the driving motor is used for driving the cam member The two-axis rotation causes the screw to move between the unopened feed opening position and the blocking position of the feed opening by the interlocking assembly.

Description

Injection molding machine feeding device

The present invention relates to a feeding device for an injection molding machine, and more particularly to a feeding device for a pre-plastic injection molding machine that preheats plastic to fill molten plastic to an injection device.

The existing pre-plastic injection molding machine comprises an injection device and a feeding device disposed on one side of the injection device. The feeding device comprises a feeding pipe connected to the injection device, a screw threaded through the feeding pipe, a bolt shaft disposed at one end of the screw, and a hydraulic cylinder connected to the bolt shaft. The feeding tube is formed with a feeding hole and a conveying hole communicating with the feeding hole. The screw penetrates into the conveying hole and drives the molten plastic in the conveying hole to flow into the feeding hole by the rotary motion, so that the molten plastic can Filling the injection device through the feed hole. The hydraulic cylinder moves the screw along its axial direction through the bolt shaft, so that the screw can block the communication between the feed hole and the delivery hole, thereby preventing the molten plastic in the feed hole from flowing back into the delivery hole.

The hydraulic cylinder is used as the power source. It is easy to affect the top thrust of the hydraulic cylinder pushing screw due to oil leakage. When the top thrust is insufficient, the screw cannot be stably positioned at the position of the blocking feed hole. As a result, the molten plastic flows back into the conveying hole, causing insufficient amount of molten plastic to be filled into the injection device to affect the quality of the injection molded product. Furthermore, the leakage of oil can also cause pollution problems, making the existing pre-plastic injection molding machine unsuitable for use in high-clean and dust-free applications.

Accordingly, it is an object of the present invention to provide a feeding device for an injection molding machine in which a screw can be stably positioned to block a blocking position of a feed hole to prevent reverse flow of molten plastic, thereby enhancing the injection molded product. quality.

Another object of the present invention is to provide a feeding device for an injection molding machine which can be applied to a high-clean and dust-free environment.

Therefore, the feeding device of the injection molding machine of the present invention is disposed on the side of an injection device of the injection molding machine, and the feeding device comprises a feeding tube, a screw, and a driving mechanism.

The feeding tube is formed with a feeding hole for conveying molten plastic to the injection device, and a conveying hole communicating with the feeding hole; the screw is disposed in the conveying hole and is rotatable around a first axis Extruding molten plastic into the feeding hole, one end of the screw is used for controlling the circulation and blocking of the feeding hole; the driving mechanism comprises a connecting assembly, a cam member, and a driving motor, and the connecting assembly is fixed Connected to the other end of the screw and can move the screw in the conveying hole along the first axis, the connecting assembly comprises a pushing member, the cam member can be wound around a second axis perpendicular to the first axis Rotating, the cam member is formed with a guiding groove for engaging the pushing member, and the driving motor is configured to drive the cam member to rotate about the second axis to interlock the connecting assembly to drive the screw to an unblocked The opening position of the feed hole is broken, and a blocking position is blocked between the blocking positions of the feed hole.

The invention has the effect of driving the cam member to rotate by using the driving motor as a power source, so that the linkage assembly can drive the screw to move between the open position and the blocking position, and the cam member is used to guide the groove and push the push. The meshing design of the piece enables the screw to be stably positioned at the blocking position to prevent the molten plastic from flowing back into the conveying hole due to the pressure during the actuating process, thereby improving the quality of the injection molded product. Furthermore, the injection molding machine does not cause oil leakage problems, and therefore can be applied to high-purity and dust-free applications.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figure 1, there is shown a first embodiment of a feeding device for an injection molding machine of the present invention. The injection molding machine 100 of the present embodiment is a pre-plastic injection molding machine comprising an injection device 10 and an injection device. 10 top side feeding device 20.

Referring to Figures 1 and 2, the injection device 10 includes a shooting tube 11, a plunger 12, and a drive mechanism 13. The injection tube 11 is formed with an injection hole 111 and a feed hole 112 communicating with the injection hole 111. The feeding device 20 is disposed on the top side of the injection tube 11, and the feeding device 20 conveys the molten plastic into the injection hole 111 via the inlet hole 112. The plunger 12 is disposed in the injection tube 11, and the driving mechanism 13 is connected to the plunger 12 for driving the plunger 12 to reciprocate in the injection hole 111. The driving mechanism 13 of the embodiment may be, for example, a pneumatic cylinder. When the driving mechanism 13 drives the plunger 12 to move toward an opening 113 of the injection hole 111, the plunger 12 compresses the molten plastic and pushes it toward the opening 113, so that the molten plastic is ejected through the opening 113 to a mold (not shown). )Inside.

Referring to Figures 1, 2 and 3, the feeding device 20 comprises a fixing frame 2, a feeding tube 3, a hopper 4, a screw 5, and a driving mechanism 6. The mounting frame 2 includes a substrate 21, a first carrier body 22 disposed on the substrate 21, a second carrier body 23 disposed on the substrate 21 and spaced apart from the first carrier body 22, and a second carrier body 23 disposed on the second carrier frame The third carrier body 24 of the top end of the carrier body 23. The opposite ends of the feeding tube 3 are fixedly connected to the top end of the injection tube 11 and the first carrier body 22, and the feeding tube 3 is formed with a conveying hole 31, a communicating with the conveying hole 31 and a hole diameter smaller than the diameter of the conveying hole 31. The feed hole 32, and a tapered shoulder 33 between the transfer hole 31 and the feed hole 32, the bottom end of the feed hole 32 communicates with the top end of the feed hole 112. The hopper 4 is disposed at the top end of the feed pipe 3 and adjacent to the first carrier 22, and the hopper 4 is used to supply, for example, a granular solid plastic (not shown) and can be supplied into the delivery hole 31. When the solid plastic is supplied into the delivery hole 31, the feed tube 3 is heated by a heating means (not shown) so that the solid plastic is melted into a liquid viscous molten plastic. The screw 5 is disposed in the conveying hole 31 and rotatable about a first axis A1. The first axis A1 is axially parallel to the screw 5. By the rotary pressurization of the screw 5, the molten plastic in the transfer hole 31 is compressed and flows into the feed hole 32 and flows into the exit hole 111 through the feed hole 112, so that the injection device 10 can perform the injection of the molten plastic.

The screw 5 includes a screw portion 51 and a block portion 52 formed at one end of the screw portion 51. The screw portion 51 has a blocking end 511 opposite to the block portion 52. The blocking end 511 has a tapered shape and is shaped to match the shape of the tapered shoulder portion 33. The blocking end 511 is used for detachment or abutment during operation. The tapered shoulder 33 is used to control the flow and blockage of the feed aperture 32. The cross-section of the block portion 52 taken along a direction perpendicular to the first axis A1 is non-circular. The cross-section of the block portion 52 of the present embodiment is a square.

The drive mechanism 6 includes a connection assembly 61, an actuating assembly 63, and a drive assembly 64. The connecting assembly 61 includes two bearings 611, a bolt shaft 612, and two stop rings 613. The two bearings 611 are disposed on the second carrier body 23 and are spaced along the first axis A1. Each of the bearings 611 includes an inner annular surface 614 and a plurality of inner teeth 615 protruding from the inner annular surface 614. The bolt shaft 612 includes a first shaft section 616, a second shaft section 617 connecting one end of the first shaft section 616, and a third shaft section connecting the first shaft section 616 opposite to the other end of the second shaft section 617. 618. The outer peripheral surface of the first shaft section 616 is formed with a plurality of outer teeth 619. The first shaft section 616 is disposed in the two bearings 611. The first shaft section 616 is engaged with the inner teeth 615 of the two bearings 611 through the outer gear teeth 619. Thereby, the first shaft section 616 is rotatable relative to the second carrier body 23 about the first axis A1 through the bearing 611, and the first shaft section 616 is movable relative to the two bearings 611 in the direction of the first axis A1.

The outer diameter of the second shaft portion 617 is larger than the outer diameter of the first shaft portion 616. The second shaft portion 617 is a pulley-like structure. The second shaft portion 617 has an end surface 620. The end surface 620 is recessed to form a slot 621. The shape of the card slot 621 is the same as that of the block portion 52 of the screw 5. The card slot 621 is configured to be engaged by the latch portion 52. Thereby, the screw shaft 5 can be driven by the pin shaft 612 while rotating around the first axis A1. Turn.

Each of the retaining rings 613 is semi-circular, and the two retaining rings 613 are fitted to each other and are sleeved on a rod segment 512 of the screw portion 51 connected to the block portion 52. Each of the blocking rings 613 is locked by screws. The end face 620 of the second shaft section 617 is locked. Each of the stopper rings 613 serves to block the block portion 52 of the screw 5, thereby preventing the block portion 52 from coming off the card slot 621.

The actuating assembly 63 includes a motor 631 disposed on the third carrier body 24, a pulley 632 coupled to the motor 631 and rotatable by the motor 631, and a toothed belt 633. The toothed belt 633 is wound and The second shaft section 617 is engaged with the pulley 632 and the pinch shaft 612. When the motor 631 drives the pulley 632 to rotate, the pulley 632 rotates the second shaft section 617 of the bolt shaft 612 through the toothed belt 633. During the rotation of the bolt shaft 612, the screw 5 is simultaneously rotated about the first axis A1 to The molten plastic is extruded into the injection hole 111.

Referring to FIG. 2, FIG. 3 and FIG. 4, the connecting assembly 61 further includes a pushing unit 622. The pushing unit 622 includes a pushing member 623, a holding ring 624, a bearing 625, and a stopping member 626. The pushing member 623 has a rod body 627 parallel to the first axis A1, and a disc body 628 formed at one end of the rod body 627. The rod body 627 has a lower abutting surface 610 facing downward, and a plurality of protruding portions The convex teeth 629 abutting against the surface 610 and spaced along the first axis A1. The retaining ring 624 is locked to the end surface of the disk body 628 by a screw locking method. The retaining ring 624 has a stopping shoulder 630 spaced apart from the disk body 628. The third shaft segment 618 of the bolting shaft 612 is disposed through the retaining ring 624. Inside. The bearing 625 is disposed in the retaining ring 624 and sleeved on the third shaft segment 618 , and one end of the bearing 625 abuts against the stopping shoulder 630 . The stopper 626 is disposed in the retaining ring 624. The opposite ends of the stopper 626 abut against the end faces of the disc body 628, respectively, and the bearing 625 is opposite to the other end of the stopping shoulder 630. The slotted shaft 612 can be rotated relative to the retaining ring 624 and the pusher 623 through the bearing 625 by the connection between the associated element of the thrusting unit 622 and the third shaft section 618.

Referring to Figures 2, 3, 4 and 5, the drive assembly 64 includes a drive motor 641 and a cam member 642. The driving motor 641 is disposed on the substrate 21 and includes a rotating shaft 643 protruding from the top surface of the substrate 21. The rotating shaft 643 is rotatable about a second axis A2 perpendicular to the first axis A1. The cam member 642 is sleeved and fixed to the rotating shaft 643, and the driving motor 641 is used to drive the cam member 642 to rotate about the second axis A2. The cam member 642 includes an upper end surface 644. The upper end surface 644 is recessed to form a plurality of spaced apart guiding grooves 645. The upper end surface 644 is for abutting against the lower abutting surface 610 of the pushing member 623. The groove 645 is for engaging the corresponding protruding teeth 629 of the pushing member 623. It should be noted that the number of the protruding teeth 629 of the pushing member 623 and the number of the guiding grooves 645 of the cam member 642 may also be one, which is not limited to the number disclosed in the embodiment.

In this embodiment, each guiding groove 645 is an arc-shaped eccentric groove, and a center C of each guiding groove 645 is spaced apart from the second axis A2 by an eccentricity D. Each of the guiding grooves 645 has a first end 646 and a second end 647 opposite to the first end 646. A first distance D1 between the first end 646 and the second axis A2 is smaller than the second end 647. A second distance D2 between the second axes A2.

The guiding groove 645 passing through the cam member 642 cooperates with the protruding tooth 629 of the pushing member 623. When the driving motor 641 drives the cam member 642 to rotate about the second axis A2 through the rotating shaft 643, the connecting assembly 61 is interlocked to The driving screw 5 is moved along the first axis A1, so that the screw 5 can be in an open position (not shown in FIG. 6) that does not block the feeding hole 32, and a blocking position in which the feeding hole 32 is blocked (FIG. 9). Move between shown).

Referring to FIG. 2, FIG. 5 and FIG. 6, when the cam member 642 is in a first position as shown in FIG. 5, the convex teeth 629 of the pushing member 623 are closer to the first end 646 of the corresponding guiding groove 645. The screw 5 is in an open position at which the blocking end 511 is spaced apart from the tapered shoulder 33, and the conveying hole 31 is in communication with the feeding hole 32. At this time, the actuating assembly 63 (shown in FIG. 1) can drive the screw 5 to rotate about the first axis A1 through the pinch shaft 612, so that the screw 5 presses a predetermined amount of molten plastic into the injection hole 111.

Referring to Figures 5, 7, 8, and 9, after the screw 5 presses a predetermined amount of molten plastic to the injection hole 111, the actuation assembly 63 stops the rotation of the drive pin shaft 612, and then the drive motor 641 transmits The rotating shaft 643 drives the cam member 642 to rotate about the second axis A2 in a first rotational direction R1. Since the pushing unit 622 is engaged with the third shaft section 618 of the bolt shaft 612, it is limited to be movable only along the first axis A1, and further, the upper end surface 644 is biased by the lower abutting surface 610 of the pushing member 623. The pushing member 623 is prevented from rotating relative to the cam member 642 about the first axis A1, and the cam member 642 is coupled to guide the groove 645 to engage with the protruding teeth 629 of the pushing member 623. Therefore, the cam member 642 is rotated. The pushing member 623 is pushed along a pushing direction I parallel to the first axis A1 to move the pushing member 623 in the pushing direction I.

Since the first shaft section 616 of the bolt shaft 612 is engaged with the inner gear teeth 615 of the bearing 611 (shown in FIG. 3) through the outer gear teeth 619 (shown in FIG. 3), the second shaft section 617 and the toothed belt The 633 is engaged. Therefore, during the movement of the pushing unit 622 in the pushing direction I, the bolt shaft 612 and the screw 5 are simultaneously pushed. When the cam member 642 is rotated to a second position as shown in FIG. 7, the screw 5 is moved to a blocking position where the blocking end 511 abuts against the tapered shoulder 33, at which time the feed hole 32 is blocked and cannot be blocked. It is in communication with the delivery hole 31. Thereafter, the drive mechanism 13 of the injection device 10 can drive the plunger 12 to eject the molten plastic in the injection hole 111 through the opening 113 into the mold.

Since the driving assembly 64 is driven by the driving motor 641 as a power source to drive the cam member 642 to move the screw 5 to the blocking position through the connecting assembly 61, the driving assembly 64 does not compare with the prior art. The top thrust of the screw 5 is affected by the leakage of the oil. Moreover, since the cam member 642 is engaged with the protruding teeth 629 of the pushing member 623 by the guiding groove 645, when the screw 5 is moved to the blocking position, the cam member 642 locks the pushing member 623 to prevent it. mobile. By the foregoing design, the screw 5 can be stably positioned at the blocking position to prevent the molten plastic of the injection device 10 from flowing back into the conveying hole 31 due to the pressure during the operation, thereby improving the injection molding. The quality of the finished product.

Referring to FIG. 5, FIG. 7 and FIG. 8, after the injection device 10 completes the injection operation of the molten plastic, the drive motor 641 drives the cam member 642 through the rotation shaft 643 to rotate around the second rotation direction R2 opposite to the first rotation direction R1. When the axis A2 rotates, the pushing member 623 moves in a pulling direction II opposite to the pushing direction I during the rotation of the cam member 642, and the bolting shaft 612 is simultaneously pulled during the movement of the pushing unit 622 in the pulling direction II. The screw 5 moves. When the cam member 642 is rotated to the first position, the screw 5 is reset to the open position shown in FIG.

Referring to Figures 10 and 11, a second embodiment of the feeding device of the injection molding machine of the present invention, the overall structure of the injection molding machine 100 is substantially the same as that of the first embodiment, except that the guiding groove 645 of the cam member 642 Design form.

In the present embodiment, the number of guiding grooves 645 and the number of protruding teeth 629 are respectively one, and the guiding groove 645 is a spiral groove which is rotated around the second axis A2 and extends outward. When the drive motor 641 drives the cam member 642 to rotate in the first rotational direction R1 through the rotary shaft 643, the cam member 642 pushes the pusher 623 in the thrust direction I to move the screw 5 from the open position to the blocking position. When the driving motor 641 drives the cam member 642 to rotate in the second rotational direction R2 through the rotating shaft 643, the cam member 642 moves the pushing member 623 in the pulling direction II to return the screw 5 from the blocking position to the open position.

Referring to Figures 12, 13, and 14, in a third embodiment of the feeding device of the injection molding machine of the present invention, the overall structure of the injection molding machine 100 is substantially the same as that of the first embodiment, except that the pushing member 623 and the cam are different. The design form of the piece 642.

In this embodiment, the rod body 627 of the pushing member 623 has an outer peripheral surface 650, and the pushing member 623 further has two columns 651 protruding from opposite sides of the outer peripheral surface 650 of the rod body 627, and two separate sleeves. The bearing 652 is disposed on the two cylinders 651, and each of the cylinders 651 is parallel to the second axis A2. The cam member 642 is sleeved and fixed on the rotating shaft 643 and includes two plate bodies 648 which are parallel to each other and spaced along the second axis A2. The two plate bodies 648 jointly define a receiving groove 649 for receiving the rod body 627. Each plate 648 defines a guide groove 645 for engagement of the corresponding bearing 652. The shape of the guiding groove 645 of each plate 648, the eccentric relationship between the center C of the guiding groove 645 and the second axis A2, and the first end 646 and the second end 647 of the guiding groove 645 and the second axis respectively The distance relationship of A2 is the same as that of the first embodiment.

Referring to FIG. 12, FIG. 14, and FIG. 15, when the cam member 642 is in the first position shown in FIG. 14, each bearing 652 of the pushing member 623 is located at the first end 646 of the corresponding guiding groove 645, and the screw is 5 positions. In the open position shown in Figure 6. When the drive motor 641 drives the cam member 642 to rotate in the first rotational direction R1 through the rotary shaft 643, the cam member 642 pushes the pusher 623 in the thrust direction I. When the cam member 642 is in the second position shown in FIG. 15, each bearing 652 of the pusher 623 is located at the second end 647 of the corresponding guide groove 645, at which time the screw 5 is moved to the blocking position of FIG. When the driving motor 641 drives the cam member 642 to rotate in the second rotational direction R2 through the rotating shaft 643, the cam member 642 moves the pushing member 623 in the pulling direction II to return the screw 5 from the blocking position to the open position.

By the pushing member 623 engaging the bearing 652 in the corresponding guiding groove 645, the friction between the pushing member 623 and the cam member 642 can be reduced, whereby the cam member 642 pushes or pulls the pushing member 623. The process of moving can be smoother. It should be noted that the number of the cylinder 651 and the bearing 652 of the pushing member 623 may also be one, and the number of the plate body 648 and the guiding groove 645 of the cam member 642 may also be one, respectively, which is not in this embodiment. The number of exposures is limited.

In summary, the feeding device 20 of the injection molding machine 100 of each embodiment rotates the driving member 64 with the driving motor 641 as a power source by the driving assembly 64, so that the connecting assembly 61 can drive the screw 5 at the same time. The movement between the open position and the blocking position, and the cam member 642 is configured to guide the groove 645 to engage with the pushing member 623, so that the screw 5 can be stably positioned at the blocking position to prevent the injection device 10 from being detached. During the operation of the plunger 12, the molten plastic flows back into the delivery hole 31 due to the pressure, whereby the quality of the injection molded product can be improved. Further, since the injection molding machine 100 does not cause oil leakage, it can be applied to a high-clean and dust-free environment, and the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

100‧‧‧Injection molding machine
10‧‧‧Injection device
11‧‧‧Bullet tube
111‧‧‧ shot hole
112‧‧‧Inlet hole
113‧‧‧ openings
12‧‧‧Plunger
13‧‧‧Drive mechanism
20‧‧‧Feeding device
2‧‧‧ Fixing frame
21‧‧‧Substrate
22‧‧‧First carrier body
23‧‧‧Second carrier body
24‧‧‧ Third carrier body
3‧‧‧ Feeding tube
31‧‧‧Transport holes
32‧‧‧ Feed hole
33‧‧‧Conical shoulder
4‧‧‧ hopper
5‧‧‧ screw
51‧‧‧ screw department
511‧‧‧Blocking end
512‧‧‧ rod segment
52‧‧‧Clamping Department
6‧‧‧Drive mechanism
61‧‧‧Connected assembly
610‧‧‧Abutment
611‧‧‧ bearing
612‧‧‧Tie shaft
613‧‧‧stop ring
614‧‧‧ Inner torus
615‧‧‧Internal teeth
616‧‧‧First shaft segment
617‧‧‧second shaft segment
618‧‧‧the third shaft segment
619‧‧‧ outer teeth
620‧‧‧ end face
621‧‧‧ card slot
622‧‧‧Pushing unit
623‧‧‧Pushing pieces
624‧‧‧ holding ring
625‧‧‧ bearing
626‧‧‧stops
627‧‧‧ rod body
628‧‧‧ dish
629‧‧ ‧ convex teeth
630‧‧‧stop shoulder
63‧‧‧Activity assembly
631‧‧‧Motor
632‧‧‧ Pulley
633‧‧‧Toothed belt
64‧‧‧Drive assembly
641‧‧‧Drive motor
642‧‧‧ cam parts
643‧‧‧ shaft
644‧‧‧ upper end
645‧‧‧ Guide groove
646‧‧‧ first end
647‧‧‧ second end
648‧‧‧ board
649‧‧‧ accommodating slots
650‧‧‧ outer perimeter
651‧‧‧Cylinder
652‧‧‧ bearing
A1‧‧‧first axis
A2‧‧‧second axis
C‧‧‧ Center
D‧‧‧eccentricity
D1‧‧‧First distance
D2‧‧‧Second distance
I‧‧‧ push direction
II‧‧‧ Pulling direction
R1‧‧‧first direction of rotation
R2‧‧‧second direction of rotation

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: Figure 1 is a side view of a first embodiment of the injection molding machine of the present invention; Figure 3 is an exploded perspective view of the feeding device of the first embodiment; Figure 4 is an exploded perspective view of the pushing unit of the first embodiment; Figure 5 is an exploded perspective view of the first embodiment An incomplete top view illustrating the cam member in the first position; FIG. 6 is an incomplete cross-sectional view of the first embodiment illustrating the screw position in the open position; FIG. 7 is an incomplete view of the first embodiment The top view shows the cam member in the second position; FIG. 8 is a partial cross-sectional view of the first embodiment, illustrating the screw position in the blocking position; FIG. 9 is an incomplete cross-sectional view of the first embodiment, illustrating the screw position Figure 10 is a fragmentary top view of the second embodiment of the injection molding machine of the present invention, illustrating the cam member in the first position; Figure 11 is an incomplete top view of the second embodiment, illustrating The cam member is in the second place Figure 12 is an incomplete side view of a third embodiment of the injection molding machine of the present invention; Figure 13 is an incomplete side view of the third embodiment; Figure 14 is an incomplete view of the third embodiment The top view illustrates the cam member in the first position; and Figure 15 is an incomplete top view of the third embodiment illustrating the cam member in the second position.

100‧‧‧Injection molding machine

11‧‧‧Bullet tube

111‧‧‧ shot hole

112‧‧‧Inlet hole

113‧‧‧ openings

12‧‧‧Plunger

13‧‧‧Drive mechanism

2‧‧‧ Fixing frame

21‧‧‧Substrate

22‧‧‧First carrier body

23‧‧‧Second carrier body

24‧‧‧ Third carrier body

3‧‧‧ Feeding tube

31‧‧‧Transport holes

32‧‧‧ Feed hole

33‧‧‧Conical shoulder

4‧‧‧ hopper

5‧‧‧ screw

51‧‧‧ screw department

511‧‧‧Blocking end

52‧‧‧Clamping Department

6‧‧‧Drive mechanism

611‧‧‧ bearing

612‧‧‧Tie shaft

613‧‧‧stop ring

616‧‧‧First shaft segment

617‧‧‧second shaft segment

618‧‧‧the third shaft segment

621‧‧‧ card slot

622‧‧‧Pushing unit

623‧‧‧Pushing pieces

624‧‧‧ holding ring

625‧‧‧ bearing

626‧‧‧stops

627‧‧‧ rod body

628‧‧‧ dish

630‧‧‧stop shoulder

631‧‧‧Motor

632‧‧‧ Pulley

633‧‧‧Toothed belt

64‧‧‧Drive assembly

641‧‧‧Drive motor

642‧‧‧ cam parts

643‧‧‧ shaft

A1‧‧‧first axis

A2‧‧‧second axis

Claims (9)

A feeding device for an injection molding machine is disposed on an injection device side of the injection molding machine, the feeding device comprising: a feeding tube formed with a feeding hole for conveying molten plastic to the injection device, And a conveying hole communicating with the feeding hole; a screw threaded in the conveying hole and rotatable about a first axis to press the molten plastic into the feeding hole, the screw end is used for controlling Flowing and blocking of the feed hole; and a drive mechanism comprising a connection assembly, a cam member, and a drive motor, the connection assembly being fixedly coupled to the other end of the screw and movable along the first axis The screw moves in the conveying hole, the connecting assembly includes a pushing member, the cam member is rotatable about a second axis perpendicular to the first axis, and the cam member is formed to be engaged by the pushing member a guiding groove for driving the cam member to rotate about the second axis to interlock the connecting assembly to drive the screw in an open position without blocking the feeding hole, and blocking the opening Move between the blocking positions of the holes. The feeding device of the injection molding machine of claim 1, wherein the guiding groove is an arc-shaped eccentric groove. The feeding device of the injection molding machine of claim 2, wherein a center of the guiding groove is spaced apart from the second axis by an eccentricity, the guiding groove has a first end, and a reverse At a second end of the first end, a first distance between the first end and the second axis is less than a second distance between the second end and the second axis. The feeding device of the injection molding machine of claim 2, wherein the pushing member has a lower abutting surface, and a protruding tooth protruding from the lower abutting surface and engaging the guiding groove, The cam member includes an upper end surface for the lower abutting surface to abut, and the upper end surface is recessed to form the guiding groove. The feeding device of the injection molding machine of claim 2, wherein the pushing member has a rod parallel to the first axis, a convex surface protruding from the outer surface of the rod and parallel to the second axis a cylinder, and a set of bearings disposed on the cylinder and engaged in the guiding groove. The feeding device of the injection molding machine of claim 1, wherein the guiding groove is a spiral groove that is centered around the second axis and that rotates and extends outward. The feeding device of the injection molding machine of claim 6, wherein the pushing member has a lower abutting surface, and a protruding tooth protruding from the lower abutting surface and engaging the guiding groove, The cam member includes an upper end surface for the lower abutting surface to abut, and the upper end surface is recessed to form the guiding groove. The feeding device of the injection molding machine of claim 4, 5 or 7, wherein the connecting assembly comprises a bolting shaft, and a pushing unit having the pushing member, the bolt shaft is fixedly connected The other end of the screw is rotatably pivotally connected to the pushing unit. The feeding device of the injection molding machine of claim 8, wherein the driving mechanism further comprises an actuating assembly for driving the pinch shaft to rotate about the first axis to link the same The screw rotates.