Guide screw rod for injection molding machine

Abstract

The utility model discloses a material guide screw rod for an injection molding machine, which comprises a charging barrel, the charging barrel is divided into a material guide pipe and an extrusion pipe, a material pushing screw rod is arranged in the material guide pipe, and one end of the material pushing screw rod is positioned in the extrusion pipe and is connected with an extrusion conical block; the extrusion conical block and the material pushing screw rod are connected and installed through a non-return block and a connecting block, and a driving motor is installed at the other end of the material pushing screw rod in a butt joint mode. When the extrusion conical block is pulled, the outer wall of the non-return block is limited by the limiting layer to prevent materials in an inner cavity of the extrusion pipe from flowing back to influence hydraulic pressure in the material guide pipe, and when the extrusion conical block is pushed, the inner wall of the extrusion conical block is extruded by the connecting spring at the end part of the connecting block to enable the non-return block to move reversely relative to the connecting block, so that the extrusion conical block is pushed. And residues on the material pushing surface of the outer surface of the connecting block are scraped off through the flow stopping conical surface.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding machine technology, specifically relating to a guide screw for injection molding machines. Background Technology

[0002] Injection molding machines, also known as injection molding machines or injection molding machines, are the main molding equipment used to produce various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. They are classified as vertical, horizontal, and all-electric. Injection molding machines heat the plastic, apply high pressure to the molten plastic, and inject it to fill the mold cavity.

[0003] Domestic utility model patent application number 202321566766.7 discloses an injection molding machine screw, including a screw with a symmetrically arranged rotating ring and a fixed ring at one end. An anti-seepage mechanism is provided on the outer side of the fixed ring. A set of connecting blocks is fixedly connected to the inner side of the rotating ring, and a snap-fit ​​ring is fixedly connected to one side of the rotating ring. A movable groove is formed on the inner side of the fixed ring, and a pair of guide grooves are formed on both sides of the movable groove. A movable ring is movably connected inside the movable groove. This application effectively supports the end of the screw near the injection port through a support structure, improving the rotational stability of the screw, reducing screw damage, ensuring injection molding effect, and protecting the connection of the support assembly to prevent plastic from seeping into the connection between the rotating ring and the fixed ring and affecting the rotation of the screw, thus extending the service life of the support assembly. The aforementioned utility model uses a rotating guide, which cannot quantitatively guide the material into the mold. It can only control the extrusion of the extrusion port by controlling the drive motor, which easily causes overflow at the extrusion port. However, quantitative material guiding of the mold by a combination of a hydraulic cylinder and a drive motor can reduce this phenomenon. During the extrusion process driven by the hydraulic cylinder, the extrusion end will cause material backflow. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a guide screw for an injection molding machine, including a barrel, which is divided into a guide tube and an extrusion tube. A pusher screw is provided inside the guide tube, and one end of the pusher screw is connected and installed inside the extrusion tube with an extrusion cone block. The extrusion cone block and the pusher screw are connected and installed through a check block and a connecting block. A drive motor is connected and installed at the other end of the pusher screw.

[0005] The material is pushed by the pusher screw and extruded through the extrusion tube into the mold for injection molding.

[0006] As a further preferred technical solution of this utility model; the guide tube is provided with a feed port, one end of the guide tube is connected to a mating interface, and the mating interface is provided with a mating plate for connecting and installing the hydraulic cylinder push end, and a limiting layer is welded and installed on the inner wall of one end of the guide tube.

[0007] The material for injection molding is fed into the feed tube through the inlet and then conveyed and extruded.

[0008] As a further preferred technical solution of this utility model; the end of the extrusion tube is provided with an extrusion port that is connected and installed inside the mold, the outer surface of the extrusion cone is provided with a guide groove, the anti-reverse block is welded and installed at one end of the extrusion cone, the anti-reverse block is provided with a guide cavity inside, the anti-reverse block is provided with a recessed sliding area at one end of the guide cavity, and the outer wall of the anti-reverse block is limited by the limiting layer.

[0009] The liquid material is gradually guided through the flow channel to the space between the extrusion cone and the extrusion port, ensuring the quantitative extrusion of the feed screw.

[0010] As a further preferred technical solution of this utility model; a threaded layer is welded and installed around the outer ring of the pusher screw, the connecting block is welded and installed at one end of the pusher screw, one end of the connecting block extends into the inside of the check block and a connecting plate is installed thereon, the connecting plate slides inside the guide cavity and the sliding area, and the connecting plate is connected and installed to the inner wall of the guide cavity through multiple sets of guide cavities.

[0011] During the feeding process, the pusher screw slowly discharges the solid material. During this slow discharge, the heating coil installed on the outer wall of the feed tube heats the solid material, melting it into a fluid liquid. When the material is discharged into the extrusion tube, the hydraulic cylinder pushes it, causing the extrusion cone to extrude the material through the extrusion port. After extrusion, the hydraulic cylinder pulls back the pusher screw and the extrusion cone. When the extrusion cone is pulled, the limiting layer limits the outer wall of the check block to prevent the material from flowing back into the extrusion tube cavity and affecting the hydraulic pressure inside the feed tube.

[0012] As a further preferred technical solution of this utility model, a flow-stopping cone surface is provided around the outer edge of the end of the anti-reverse block, and a pusher surface is provided around the outer edge of the connecting block.

[0013] The materials are generally different types of plastics. After melting, they have a certain viscosity and a relatively high density. The connecting plate slides inside the guide cavity and sliding area, reducing the gap between the anti-reverse block and the end of the pusher screw, thereby reducing the amount of liquid material entering the guide cavity.

[0014] As a further preferred technical solution of this utility model; a partition is installed at the other end of the pusher screw, and an installation box is welded to one end of the partition. The bottom of the drive motor is fixedly installed inside the installation box through a welding plate, and the output end of the drive motor passes through the installation box and the partition and is fixedly connected to the pusher screw.

[0015] The feed screw is driven by a drive motor to rotate and guide the material.

[0016] As a further preferred technical solution of this utility model; four sets of sliders are fixedly installed on the outside of the mounting box, and four sets of auxiliary sliding grooves are correspondingly installed on the inner wall of the guide tube. The sliders are slidably installed on the auxiliary sliding grooves. A docking plate is connected to one end of the mounting box, and the docking plate is connected to the pushing end of the oil cylinder.

[0017] When the hydraulic cylinder pushes the pusher screw to move, the slider and the auxiliary slide groove slide together to assist the movement of the mounting box.

[0018] Beneficial effects

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. The connecting plate slides inside the guide cavity and sliding area, reducing the gap between the check block and the end of the push screw, thereby reducing the amount of liquid material entering the guide cavity. Once liquid material flows into the interior through the gap between the check block and the connecting block, it remains between the inner wall of the connecting plate and the check block, without affecting the connecting spring. This prevents the liquid material from overflowing into the guide cavity at a high temperature and affecting the internal structure. During pushing, the connecting spring at the end of the connecting block squeezes the inner wall of the extrusion cone, causing the check block to move in the opposite direction relative to the connecting block. The residue on the push surface of the connecting block is then scraped off by the flow-stopping cone.

[0021] 2. When the material is discharged into the extrusion tube, the hydraulic cylinder pushes it to make the extrusion cone extrude the material from the extrusion port. After extrusion, the hydraulic cylinder pulls back the pusher screw and the extrusion cone. When the extrusion cone is pulled, the limiting layer limits the outer wall of the check block to prevent the material in the extrusion tube cavity from flowing back and affecting the hydraulic pressure inside the guide tube. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0025] Figure 4 This is a cross-sectional structural diagram of the anti-reverse block of this utility model.

[0026] In the diagram: 1. Barrel; 11. Connecting plate; 12. Connecting interface; 2. Guide tube; 21. Limiting layer; 22. Feed inlet; 23. Auxiliary chute; 3. Extrusion tube; 31. Extrusion port; 4. Push screw; 41. Threaded layer; 42. Connecting block; 43. Pushing surface; 44. Connecting plate; 45. Connecting spring; 5. Extrusion cone; 51. Guide groove; 52. Anti-reverse block; 53. Guide cavity; 54. Sliding area; 55. Anti-flow cone surface; 6. Mounting box; 61. Partition plate; 62. Slider; 63. Connecting plate; 64. Welding plate; 7. Drive motor. Detailed Implementation

[0027] This specific embodiment is a feed screw for an injection molding machine.

[0028] The present invention uses a rotating guide, which cannot quantitatively guide the material into the mold. It can only control the extrusion of the extrusion port by controlling the drive motor, which is prone to overflow of the extrusion port. However, the combination of a hydraulic cylinder and a drive motor to quantitatively guide the material into the mold can reduce this phenomenon. During the extrusion process driven by the hydraulic cylinder, the extrusion end will cause the material to flow back.

[0029] Its structural diagram is as follows Figures 1-4As shown. A feed screw for an injection molding machine includes a barrel 1, which is divided into a feed tube 2 and an extrusion tube 3. The feed tube 2 has a feed inlet 22, and a mating interface 12 is connected to one end of the feed tube 2. The mating interface 12 has a mating plate 11 for connecting and installing the push end of a hydraulic cylinder. A limiting layer 21 is welded and installed on the inner wall of one end of the feed tube 2. The material to be injected is introduced into the feed tube 2 through the feed inlet 22 for conveying and extrusion. A pusher screw 4 is provided inside the feed tube 2, and an extrusion cone block 5 is connected and installed at one end of the pusher screw 4 inside the extrusion tube 3. The extrusion cone block 5 and the pusher screw 4 are connected and installed through a check block 52 and a connecting block 42. The extrusion tube 3 has an extrusion port 31 at its end that is connected to the inside of the mold. A guide groove 51 is formed on the outer surface of the extrusion cone 5. A check block 52 is welded to one end of the extrusion cone 5. A guide cavity 53 is formed inside the check block 52. A recessed sliding area 54 is formed at one end of the guide cavity 53 inside the check block 52. The outer wall of the check block 52 is limited by a limiting layer 21. The liquid material during the conveying process is gradually guided through the guide groove 51 to the space between the extrusion cone 5 and the extrusion port 31, ensuring the quantitative extrusion of the feed screw. A threaded layer 41 is welded to the outside of the push screw 4. A connecting block 42 is welded to one end of the push screw 4. One end of the connecting block 42 extends into the inside of the check block 52 and is fitted with a connecting plate 44. The connecting plate 44 slides within the guide cavity 53 and the sliding area 54. The connecting plate 44 is connected to the inner wall of the guide cavity 53 by multiple sets of connecting springs 45. During the feeding process, the pusher screw 4 slowly discharges the solid material. During this slow discharge, a heating coil installed on the outer wall of the feed tube 2 heats the solid material, melting it into a fluid liquid. As the material is discharged into the extrusion tube 3, a hydraulic cylinder pushes it, causing the extrusion cone 5 to extrude the material through the extrusion port 31. After extrusion, the hydraulic cylinder pulls back the pusher screw 4 and the extrusion cone 5. When the extrusion cone 5 is pulled back, the limiting layer 21 limits the outer wall of the check block 52, preventing material backflow into the extrusion tube 3 and affecting the hydraulic pressure inside the feed tube 2. A flow-stopping cone surface 55 is provided around the outer end of the check block 52, and a pusher surface 43 is provided around the outer edge of the connecting block 42.The materials are generally different types of plastics. After melting, they have a certain viscosity and high density. The connecting plate 44 slides inside the guide cavity 53 and the sliding area 54, reducing the gap between the check block 52 and the end of the pusher screw 4, thereby reducing the amount of liquid material entering the guide cavity 53. Once liquid flows into the interior through the gap between the check block 52 and the connecting block 42, it remains between the inner wall of the connecting plate 44 and the check block 52, without affecting the connecting spring 45. This prevents the liquid material from overflowing into the guide cavity 53 at a high temperature and affecting the internal structure. During pushing, the connecting spring 45 at the end of the connecting block 42 squeezes the inner wall of the extrusion cone 5, causing the check block 52 to move in the opposite direction relative to the connecting block 42. The residue on the pusher surface 43 of the outer surface of the connecting block 42 is then scraped off by the flow-stopping cone surface 55. The other end of the pusher screw 4 is connected to a drive motor 7. A partition plate 61 is installed at the other end of the pusher screw 4. A mounting box 6 is welded to one end of the partition plate 61. The bottom of the drive motor 7 is fixedly installed inside the mounting box 6 via a welding plate 64. The output end of the drive motor 7 passes through the mounting box 6 and the partition plate 61 and is fixedly connected to the pusher screw 4. The drive motor 7 drives the pusher screw 4 to rotate and guide the material. Four sets of sliders 62 are fixedly installed on the outside of the mounting box 6. Four sets of auxiliary sliding grooves 23 are correspondingly installed on the inner wall of the guide tube 2. The sliders 62 are slidably installed on the auxiliary sliding grooves 23. A docking plate 63 is connected to one end of the mounting box 6 and is connected to the pushing end of the hydraulic cylinder. When the hydraulic cylinder pushes the pusher screw 4 to move, the sliders 62 slide in cooperation with the auxiliary sliding grooves 23, so that the mounting box 6 moves with assistance.

[0030] During the use of the injection molding machine, hard material is introduced into the guide tube 2 through the feed port 22. Driven by the drive motor 7, the material is pushed forward by the rotation of the push screw 4. During the pushing process, the material is heated by the heating coil installed outside the guide tube 2, so that it melts into a liquid state for conveying. When it is conveyed to the position of the extrusion cone 5, it is pushed by the oil cylinder installed on the docking plate 63, so that a gap is created between the check block 52 and the limiting layer 21, so that the material is discharged into the extrusion tube 3. It is then pushed back by the oil cylinder and extruded into the mold through the extrusion port 31.

[0031] All technical features in this embodiment can be freely combined according to actual needs.

[0032] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A material-conducting screw for an injection molding machine, characterized in that Including the cylinder (1), the cylinder (1) is divided into the material pipe (2) and the extrusion pipe (3), the material pipe (2) is internally provided with the material pushing screw (4), and one end of the material pushing screw (4) is located inside the extrusion pipe (3) and is connected and installed with the extrusion taper block (5), the extrusion taper block (5) and the material pushing screw (4) are connected and installed through the reverse stop block (52) and the connecting block (42), the other end of the material pushing screw (4) is butt-jointed and installed with the driving motor (7).

2. The metering screw for injection molding machines according to claim 1, characterized in that: The material pipe (2) is provided with the feeding port (22), one end of the material pipe (2) is butt-jointed and installed with the butt joint (12), and the butt joint (12) is provided with the butt joint disc (11) for butt-jointing and installing the pushing end of the oil cylinder, and the limit layer (21) is welded and installed on the inner wall of one end of the material pipe (2).

3. The metering screw for injection molding machines according to claim 2, characterized in that: The extrusion pipe (3) is provided with the extrusion outlet (31) at one end, which is butt-jointed and installed with the mold, the extrusion taper block (5) is provided with the flow guide groove (51) on the outer surface, the reverse stop block (52) is welded and installed at one end of the extrusion taper block (5), the reverse stop block (52) is internally provided with the guide cavity (53), the reverse stop block (52) is internally provided with the inward sliding area (54) at one end of the guide cavity (53), and the reverse stop block (52) is limited by the limit layer (21) on the outer wall.

4. The metering screw for injection molding machines according to claim 3, characterized in that: One circle of the material pushing screw (4) is welded and installed with the threaded layer (41), the connecting block (42) is welded and installed at one end of the material pushing screw (4), the connecting block (42) extends to the inside of the reverse stop block (52) at one end and is installed with the connecting plate (44), the connecting plate (44) slides in the guide cavity (53) and the sliding area (54), and the connecting plate (44) and the inner wall of the guide cavity (53) are connected and installed through a plurality of connecting springs (45).

5. The metering screw for injection molding machines according to claim 4, characterized in that: The reverse stop block (52) is provided with the flow stopping taper surface (55) at one end, and the connecting block (42) is provided with the material pushing surface (43) at one end.

6. The metering screw for injection molding machines according to claim 1, characterized in that: The other end of the material pushing screw (4) is installed with the partition plate (61), one end of the partition plate (61) is welded and installed with the mounting box (6), the driving motor (7) is fixedly installed in the mounting box (6) through the welding plate (64), and the output end of the driving motor (7) penetrates the mounting box (6) and the partition plate (61) and is fixedly connected with the material pushing screw (4).

7. The metering screw for injection molding machines according to claim 6, characterized in that: Four groups of sliding blocks (62) are fixedly installed on the outside of the mounting box (6), four groups of auxiliary sliding grooves (23) are correspondingly installed on the inner wall of the material pipe (2), the sliding blocks (62) are slidably installed on the auxiliary sliding grooves (23), and the mounting box (6) is butt-jointed and installed with the butt joint plate (63), and the butt joint plate (63) is connected and installed with the pushing end of the oil cylinder.

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