A device for quickly replacing small material tube groups

Abstract

The present invention discloses a device for quickly replacing a small material tube group, comprising an injection seat, on which a small material tube group is installed, and on which a feed hopper is detachably installed; the small material tube group comprises a melt glue barrel, which is connected to the injection seat through a transition seat, and a hopper transition seat is provided on the melt glue barrel, and the hopper transition seat is connected to the feed hopper through a connecting flange; a melt glue screw is provided in the melt glue barrel, and a nozzle flange is installed at one end of the melt glue barrel away from the injection seat, and a nozzle is installed on the nozzle flange; a heating ring is installed on the outer periphery of the melt glue barrel; the present invention solves the problem that some products have high precision requirements and require particularly high injection pressure. The conventional method for injection is to replace the screw diameter that matches the injection pressure, and it is not necessary to change the main body of the machine, and only the material tube group needs to be changed to achieve it.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding equipment, and in particular to a device for quickly replacing a small material tube group. Background Art

[0002] The plasticization of plastics is the primary condition for achieving good injection and ensuring the quality of molded products. At present, the plasticization principle of plastics is: during pre-plasticization, the screw rotates to continuously push the material that falls into the screw groove from the material port forward, and the heating ring transfers heat to the material in the screw groove through the barrel wall. The solid material is plasticized and melted under the dual effects of external heating and screw rotation shearing, and undergoes the thermal history of each functional section of the screw. The molten material pushes the check ring and flows into the storage chamber of the barrel through the channel in the screw head, generating back pressure to push the screw backward to complete the metering of the molten material. During injection, the screw acts as a plunger and moves forward rapidly under the action of the oil cylinder to inject the melt in the storage chamber into the mold through the nozzle.

[0003] At present, a group of injection molding machines needs to be matched with a material tube group that can only be compatible with a screw diameter of 5mm for a small injection molding machine, which cannot directly meet the production of products with high consistent precision requirements, especially in electronic plug-in products, which have high product precision requirements and require particularly high injection pressure. The conventional injection method is to replace the screw diameter that matches the injection pressure, and move the injection mechanism forward at the same time. For conventional injection machine mechanisms, the injection platform oil circuit, the frame body of the fixed injection mechanism, the connecting oil pipe, the injection and transfer oil pipe assembly, and the sheet metal assembly on the injection machine mechanism must be modified together; or the diameter increases the aspect ratio of the screw. Increasing the aspect ratio of the screw brings a series of risks, because for high-precision products, the material stays in the screw for too long, which makes the material easy to decompose, the product is prone to yellowing, or air entrapment; and some injection mechanisms are restricted, resulting in the inability to modify the injection. Summary of the invention

[0004] The purpose of the present invention is to provide a device for quickly replacing a small material tube group to solve the problem that some products have high precision requirements and require particularly high injection pressure. The conventional injection method is to replace the screw diameter to match the injection pressure. There is no need to change the machine body, only the material tube group needs to be changed to achieve this.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A device for quickly replacing a small material tube group comprises an injection seat, on which a small material tube group is mounted, and on which a feed hopper is detachably mounted; the small material tube group comprises a melt glue cylinder, which is connected to the injection seat via a transition seat, on which a hopper transition seat is arranged, and which is connected to the feed hopper via a connecting flange; a melt glue screw is arranged in the melt glue cylinder, a nozzle flange is mounted at one end of the melt glue cylinder away from the injection seat, and a nozzle is mounted on the nozzle flange; a heating ring is mounted on the outer periphery of the melt glue cylinder.

[0007] As a further solution of the present invention: a fixing plate of the melt glue cylinder is fixedly arranged on the outer periphery of the melt glue cylinder, and the fixing plate of the melt glue cylinder is fixedly mounted on the transition seat by means of positioning pins.

[0008] As a further solution of the present invention: the melt screw is connected to the output end of the injection seat through a screw transition rod, and the injection seat is used to control the rotation of the melt screw.

[0009] As a further solution of the present invention: a screw pressure plate for limiting the position of the melt screw is arranged on one side of the melt cylinder close to the injection seat.

[0010] As a further solution of the present invention: a heat-insulating sleeve is arranged outside the heating coil.

[0011] As a further solution of the present invention: a rubber ring is arranged on a side of the melt screw away from the injection seat, and a rubber head is installed on the rubber ring.

[0012] As a further solution of the present invention: a replacement groove is arranged on the transition seat, the replacement groove is located at the connection between the melt screw and the screw transition rod, and a protective cover is installed on the replacement groove.

[0013] As a further solution of the present invention: the transition seat is connected to the injection seat through the injection head plate, and the transition seat is fixedly mounted on the injection head plate through the melt tube nut.

[0014] The beneficial effects of the present invention are as follows: the present invention is designed to solve the problem that some products have high precision requirements and require particularly high injection pressure. The conventional method for injection is to replace the screw diameter that matches the injection pressure. There is no need to change the machine body, and only the material pipe group needs to be changed to achieve this. The screw design can adopt a conventional design, and there is no need to increase or lengthen the screw to achieve this. The problem of the material staying in the screw for too long, which leads to easy decomposition of the material, yellowing of the product, or air entrapment, is solved. The mechanism is simple, highly practical, has a simple processing structure, and is low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic cross-sectional view of the small material tube assembly of the present invention;

[0018] Figure 3 It is a schematic diagram of the explosion structure of the small material tube group of the present invention.

[0019] In the figure: 1. Nozzle; 2. Nozzle flange; 3. Glue feeding head; 4. Glue feeding ring; 5. Glue feeding gasket; 6. Glue melting screw; 7. Glue melting cylinder; 8. Heating coil; 9. Glue melting cylinder fixing plate; 10. Positioning pin; 11. Hopper transition seat; 12. Transition seat; 13. Screw pressure plate; 14. Screw flat key; 15. Protective cover; 16. Screw transition rod; 17. Glue injection head plate; 18. Glue melting cylinder nut; 19. Feed hopper; 20. Injection seat. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 3 As shown, the present invention is a device for quickly replacing a small material tube group, comprising an injection seat 20, on which a small material tube group is installed, and a feed hopper 19 is detachably installed on the small material tube group; the small material tube group comprises a melt glue cylinder 7, which is connected to the injection seat 20 through a transition seat 12, on which a hopper transition seat 11 is provided, and the hopper transition seat 11 is connected to the feed hopper 19 through a connecting flange; a melt glue screw 6 is provided in the melt glue cylinder 7, and a nozzle flange 2 is installed at one end of the melt glue cylinder 7 away from the injection seat 20, and a nozzle 1 is installed on the nozzle flange 2; a heating ring 8 is installed on the periphery of the melt glue cylinder 7.

[0022] The material is stored in the feed hopper 19. A gate valve is provided between the feed hopper 19 and the hopper transition seat 11 to control the automatic feeding of the material. When feeding is required, the gate valve is opened, and the material falls into the melt glue barrel 7 through the hopper transition seat 11. The melt glue screw 6 is driven to rotate through the injection seat 20. At the same time, the heating coil 8 heats the melt glue barrel 7 to melt the plastic that falls into the melt glue barrel 7. The melt glue screw 6 is then used to feed the molten plastic into the nozzle flange 2, and then ejected through the nozzle 1 to complete the injection of the plastic.

[0023] A glue melt cylinder fixing plate 9 is fixedly arranged on the outer periphery of the glue melt cylinder 7, and the glue melt cylinder fixing plate 9 is fixedly installed on the transition seat 12 through a positioning pin 10. The glue melt cylinder 7 is installed through the glue melt cylinder fixing plate 9 and the positioning pin 10, which ensures the accuracy and stability of the installation on the one hand, and facilitates the disassembly of the glue melt cylinder 7 on the other hand.

[0024] The melt screw 6 is connected to the output end of the injection seat 20 through the screw transition rod 16. The melt screw 6 and the screw transition rod 16 are connected through the screw flat key 14. The injection seat 20 is used to control the rotation of the melt screw 6. A replacement groove is provided on the transition seat 12. The replacement groove is located at the connection between the melt screw 6 and the screw transition rod 16. The melt screw 6 and the screw transition rod 16 can be easily disassembled through the replacement groove, so as to facilitate the replacement of the melt screw 6; a protective cover 15 is installed on the replacement groove. The protective cover 15 protects the transition seat 12 and prevents the outside from causing pollution to the plastic injection.

[0025] A screw pressing plate 13 for limiting the position of the melt glue screw 6 is arranged on one side of the melt glue cylinder 7 close to the injection seat 20. The arrangement of the screw pressing plate 13 ensures the stability of the installation of the melt glue screw 6 and prevents the melt glue screw 6 from being displaced when rotating.

[0026] An insulation sleeve is arranged outside the heating coil 8, and the heating coil 8 is used to heat the melt glue tube 7. The setting of the insulation sleeve not only keeps the melt glue tube 7 warm to prevent the heat loss of the heating coil 8, but also protects the staff to prevent burns.

[0027] A rubber ring 4 is arranged on the side of the melt screw 6 away from the injection seat 20 , and a rubber gasket 5 is arranged between the rubber ring 4 and the melt screw 6 . The arrangement of the rubber gasket 5 ensures the stability of the installation of the rubber ring 4 , and a rubber head 3 is installed on the rubber ring 4 .

[0028] The transition seat 12 is connected to the injection seat 20 through the injection head plate 17. The transition seat 12 is fixedly mounted on the injection head plate 17 through the melt tube nut 18. The setting of the melt tube nut 18 ensures the stability of the installation of the melt tube 7.

[0029] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A device for quickly replacing a small material tube group, comprising an injection seat (20), on which a small material tube group is mounted, and on which a feed hopper (19) is detachably mounted; characterized in that: The small material tube group comprises a melt glue cylinder (7), the melt glue cylinder (7) is connected to the injection seat (20) via a transition seat (12), a hopper transition seat (11) is arranged on the transition seat (12), and the hopper transition seat (11) is connected to the feed hopper (19) via a connecting flange; a melt glue screw (6) is arranged in the melt glue cylinder (7), a nozzle flange (2) is installed at one end of the melt glue cylinder (7) away from the injection seat (20), and a nozzle (1) is installed on the nozzle flange (2); a heating ring (8) is installed on the outer periphery of the melt glue cylinder (7); A melt-adhesive cylinder fixing plate (9) is fixedly arranged on the outer periphery of the melt-adhesive cylinder (7), and the melt-adhesive cylinder fixing plate (9) is fixedly mounted on the transition seat (12) via a positioning pin (10); The melt screw (6) is connected to the output end of the injection seat (20) via a screw transition rod (16), and the injection seat (20) is used to control the rotation of the melt screw (6); A screw pressure plate (13) for limiting the position of the melt glue screw (6) is provided on one side of the melt glue cylinder (7) close to the injection seat (20); The transition seat (12) is provided with a replacement groove, the replacement groove is located at the connection between the melt screw (6) and the screw transition rod (16), and a protective cover (15) is installed on the replacement groove; The transition seat (12) is connected to the injection seat (20) via the injection head plate (17), and the transition seat (12) is fixedly mounted on the injection head plate (17) via a melt tube nut (18).

2. A device for quickly replacing a small material tube set according to claim 1, characterized in that: A heat-insulating sleeve is arranged outside the heating coil (8).

3. The device for quickly replacing a small material tube set according to claim 1, characterized in that: A rubber ring (4) is provided on a side of the melt screw (6) away from the injection seat (20), and a rubber head (3) is installed on the rubber ring (4).

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