Physical foaming molding injection device of injection molding machine

Abstract

The utility model discloses a physical foaming molding injection device of an injection molding machine, which comprises an injection pipe and a driving source, a screw rod, a mixing rod, an injection screw rod head, a first countercurrent ring, a second countercurrent ring, a first baffle ring seat and a second baffle ring seat are arranged in the injection pipe, the front end and the rear end of the mixing rod are respectively connected with the injection screw rod head and the screw rod, and the first countercurrent ring and the second countercurrent ring are respectively connected with the first baffle ring seat and the second baffle ring seat. A feeding chamber is formed between the screw rod and the inner wall of the injection pipe, the second countercurrent ring is mounted between the screw rod and the mixing rod through a second baffle ring seat, the second countercurrent ring is used for sealing the feeding chamber, and a mixing chamber is formed between the mixing rod and the inner wall of the injection pipe; the first countercurrent ring is mounted between the injection screw head and the mixing rod through a first baffle ring seat, and the first countercurrent ring is used for sealing the mixing chamber. According to the utility model, plastic and gas can be fully mixed and stirred in an environment with better sealing performance, and the plastic mixer has the advantages of saving the processing time, achieving the purposes of light weight of products, reducing the plastic cost, being environment-friendly and the like.

Description

Technical Field

[0001] The utility model belongs to the field of injection molding machines, and in particular relates to a physical foaming molding injection device of an injection molding machine. Background Art

[0002] At present, with the diversification and customization of plastic products, foaming products are made of plastic containing microbubbles through mold molding, cooling and solidification. They have the advantages of lightweight, high toughness and noise reduction, and can save process time and reduce the use of plastics. They have been widely used in the manufacturing fields of various plastic products, such as: shoemaking, blow molding, automotive industry, electrical appliances and other products. Foaming molding is divided into chemical foaming and physical foaming. Chemical foaming molding is made by adding chemical foaming agents to plastics, which will cause pollution to the environment and cannot be recycled. Physical foaming molding is made by mixing plastics and gas without adding chemical agents, making the process environmentally friendly and the product plastics recyclable.

[0003] However, in the existing physical foaming molding process, the injection device has poor sealing when melting the plastic, causing gas leakage or insufficient pressure, so that the plastic and gas cannot be fully mixed and stirred, resulting in uneven distribution of bubbles in the foamed plastic, thereby causing the problem of poor product yield.

[0004] Therefore, a new technical solution is needed to solve this problem. Summary of the invention

[0005] Purpose of the invention: In order to solve the problem of poor product yield caused by poor sealing in the prior art, a physical foaming molding injection device of an injection molding machine is provided, which can fully mix and stir plastic and gas in an environment with better sealing, and has the advantages of saving process time, achieving product lightweight, reducing plastic costs and being environmentally friendly.

[0006] Technical solution: To achieve the above-mentioned purpose, the utility model provides a physical foaming molding injection device of an injection molding machine, including a shooting tube and a driving source, wherein a screw rod, a mixing rod, a shooting screw rod head, a first countercurrent ring, a second countercurrent ring, a first baffle ring seat and a second baffle ring seat are arranged in the shooting tube, the front end and the rear end of the mixing rod are respectively connected to the shooting screw head and the screw rod, the screw rod is connected to the driving source, a feeding chamber is formed between the screw rod and the inner wall of the shooting tube, the second countercurrent ring is installed between the screw rod and the mixing rod through the second baffle ring seat, the second countercurrent ring is used to seal the feeding chamber, a mixing chamber is formed between the mixing rod and the inner wall of the shooting tube, the first countercurrent ring is installed between the shooting screw rod head and the mixing rod through the first baffle ring seat, the first countercurrent ring is used to seal the mixing chamber, a feed hole and an air inlet are arranged on the shooting tube, and the feed hole and the air inlet are respectively connected to the feeding chamber and the mixing chamber.

[0007] Furthermore, the end of the shooting tube is connected with a non-return nozzle, and the non-return nozzle comprises a nozzle head and a non-return rod. The end of the nozzle head is provided with a shooting hole, and the non-return rod is fitted in the nozzle head.

[0008] Furthermore, the inner end of the check rod is tightly fitted with the inner diameter inclined surface of the nozzle head, and the outer end is fitted in the injection hole, and a pressurized area is formed between the check rod and the inner diameter of the nozzle head.

[0009] Furthermore, a plurality of evenly distributed protrusions are provided on the outer wall of the mixing rod, and the provision of the protrusions can improve the mixing efficiency and shorten the mixing time.

[0010] Furthermore, there is a distance between the protrusion and the inner wall of the mixing chamber.

[0011] Furthermore, there is a gap between the first counter-flow ring and the first retaining ring seat, and there is a gap between the second counter-flow ring and the second retaining ring seat.

[0012] Furthermore, the mixing rod is passed through and fixed on the screw rod, and the injection screw head is passed through and fixed on the mixing rod.

[0013] Furthermore, the material inlet is connected to a material barrel.

[0014] Furthermore, the air inlet is connected to an air pipe, the air pipe is connected to a gas cylinder, and a control valve is provided on the air pipe. The control valve is used to adjust the gas in the gas cylinder to supply the mixing chamber with an optimal gas flow rate and pressure. The gas cylinder can be filled with nitrogen (N2) or carbon dioxide (CO2).

[0015] Furthermore, the first countercurrent ring is tightly fitted with the inner wall of the mixing chamber, and the second countercurrent ring is tightly fitted with the inner wall of the feeding chamber.

[0016] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0017] 1. The first countercurrent ring and the second countercurrent ring are respectively arranged in the injection tube, which can play a very good sealing role and effect on the mixing chamber, and solve the technical problem of poor sealing when the existing physical foaming molding injection device melts the plastic. Under the action of the mixing rod, the plastic and the gas can be fully mixed and stirred in an environment with better sealing, which not only effectively saves the process time and improves the mixing efficiency, but also realizes sufficient mixing and stirring, improves the product quality, and improves the product yield.

[0018] 2. Through the matching design of the anti-return nozzle on the injection tube, the anti-return rod fits tightly with the inner diameter slope of the nozzle head and can move and extend in the injection hole. When the anti-return nozzle leaves the mold, the ejected plastic will not flow back through the adaptive movement of the anti-return rod, thus ensuring the accuracy of injection.

[0019] 3. The outer wall of the mixing rod is provided with multiple evenly distributed protrusions, which can shorten the time for mixing the plastic evenly and further improve the mixing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the utility model;

[0021] Figure 2 It is a three-dimensional exploded view of the utility model;

[0022] Figure 3 It is a combined cross-sectional view of the utility model;

[0023] Figure 4 This is a perspective view of the interior of the central injection tube of the utility model;

[0024] Figure 5 It is a partial cross-sectional enlarged view of the mixing rod of the utility model;

[0025] Figure 6 It is a partial enlarged cross-sectional view of the spiral rod of the utility model.

[0026] Figure 7 It is a combined sectional action schematic diagram of the utility model when it is in working state. DETAILED DESCRIPTION

[0027] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0028] like Figure 1 to Figure 6As shown, the utility model provides a physical foaming molding injection device of an injection molding machine, the injection device 1 includes an injection tube 3 and a driving source 5, the injection tube 3 is provided with a screw rod 31, a mixing rod 30, an injection screw rod head 36, a first counterflow ring 32, a second counterflow ring 33, a first retaining ring seat 34 and a second retaining ring seat 35, the rear end of the mixing rod 30 is fixed on the screw rod 31, the injection screw rod head 36 is fixed on the front end of the mixing rod 30, the screw rod 31 is connected to the driving source 5, and the screw rod 31 is connected to the driving source 5. 1 and the inner wall of the injection tube 3 form a feeding chamber 39, the second counterflow ring 33 is installed between the screw rod 31 and the mixing rod 30 through the second retaining ring seat 35, there is a gap between the second counterflow ring 33 and the second retaining ring seat 35, the second counterflow ring 33 is tightly fitted with the inner wall of the feeding chamber 39, and the second counterflow ring 33 is used to seal the feeding chamber 39, a mixing chamber 38 is formed between the mixing rod 30 and the inner wall of the injection tube 3, and the first counterflow ring 32 is installed on the injection screw head 36 through the first retaining ring seat 34. There is a gap between the first backflow ring 32 and the first baffle ring seat 34, and the first backflow ring 32 is tightly fitted with the inner wall of the mixing chamber 38. The first backflow ring 32 and the second backflow ring 33 are used to seal the mixing chamber 38. The end of the injection tube 3 is connected to a non-return nozzle 2, which includes a nozzle head 20 and a non-return rod 21. The end of the nozzle head 20 is provided with a material injection hole 22. The inner end of the non-return rod 21 is tightly fitted with the inner diameter inclined surface of the nozzle head 20, and the outer end is matched. In the shooting hole 22, the check rod 21 can move and extend in the shooting hole 22, and can also move along the inner diameter surface of the nozzle head 20. A pressurized area 392 is formed between the check rod 21 and the inner diameter of the nozzle head 20. A feed hole 391 and an air inlet hole 390 are provided on the shooting tube 3. The feed hole 391 and the air inlet hole 390 are connected to the feeding chamber 39 and the mixing chamber 38 respectively. A plurality of evenly distributed protrusions 37 are provided on the outer wall of the mixing rod 30, and there is a distance between the protrusions 37 and the inner wall of the mixing chamber 38.

[0029] like Figure 7 As shown, in this embodiment, the above-mentioned physical foaming molding injection device is applied as an example. In this embodiment, the driving source 5 is a material storage servo motor, the upper part of the feeding hole 391 is connected to the material barrel 6, the air inlet 390 is connected to the air pipe 40, the air pipe 40 is connected to the gas cylinder 4, and the air pipe 40 is provided with a control valve 41. The control valve 41 is used to adjust the gas of the gas cylinder 4 to supply the mixing chamber with a better gas flow rate and pressure. In this embodiment, the gas cylinder 4 is filled with nitrogen; refer to Figure 1 to Figure 7 , the specific operation process is:

[0030] First, the mold 7 is placed at a designated position so that the backflow prevention nozzle 2 is at the injection position. The material storage servo motor as the driving source 5 drives the screw rod 31 to rotate. The screw rod 31 drives the mixing rod 30 and the injection screw head 36 to rotate at the same time. The plastic in the barrel 6 enters the feeding chamber 39 through the feeding hole 391. The plastic is transported to the discharge end of the feeding chamber 39 under the action of the screw rod 31, and is sent to the mixing chamber 38 through the gap space between the second counterflow ring 33 and the second retaining ring seat 35.

[0031] The gas flow and pressure are controlled by the control valve 41. The nitrogen in the gas cylinder 4 enters the mixing chamber 38 through the air inlet 390. The mixing rod 30 in the mixing chamber 38 fully mixes and stirs the plastic and the nitrogen. The mixed plastic is then sent to the pressurizing area 392 through the gap space between the first countercurrent ring 32 and the first baffle ring seat 34 by the shooting screw head 36. The plastic in the pressurizing area 392 is finally injected into the mold 7 through the anti-backflow nozzle 2 until the filling of the mold 7 is completed.

[0032] When the anti-return nozzle 2 leaves the mold 7, the anti-return rod 21 is in close contact with the inner diameter inclined surface of the nozzle head 20, thereby ensuring that the ejected plastic will not flow back. This not only ensures better precision of the ejected plastic, but also avoids the waste of raw materials caused by plastic backflow.

[0033] In summary, it can be seen that the physical foaming molding injection device provided by the utility model has the following advantages:

[0034] 1. The first countercurrent ring 32 and the second countercurrent ring 33 are respectively arranged in the injection tube 3, which can play a very good sealing role and effect on the mixing chamber 38, and solve the technical problem of poor sealing when melting plastic in the existing physical foaming molding injection device. Under the action of the mixing rod 30, the plastic and the gas can be fully mixed and stirred in an environment with better sealing, which not only effectively saves the process time and improves the mixing efficiency, but also realizes sufficient mixing and stirring, improves the product quality, and improves the product yield.

[0035] 2. Through the matching design of the anti-return nozzle 2 on the shooting tube 3, the anti-return rod 21 is tightly fitted with the inner diameter slope of the nozzle head 20, and can move and extend in the shooting hole 22, so that when the anti-return nozzle 2 leaves the mold 7, the ejected plastic will not flow back through the adaptive movement of the anti-return rod 21, thereby ensuring the accuracy of the shooting.

[0036] 3. The outer wall of the mixing rod 30 is provided with a plurality of evenly distributed protrusions 37, which can shorten the time for mixing the plastic evenly and further improve the mixing efficiency.

Claims

1. A physical foaming molding injection device of an injection molding machine, comprising a material injection tube and a driving source, characterized in that: A screw rod, a mixing rod, a shooting screw rod head, a first countercurrent ring, a second countercurrent ring, a first baffle ring seat and a second baffle ring seat are arranged in the shooting tube. The front end and the rear end of the mixing rod are respectively connected to the shooting screw head and the screw rod. The screw rod is connected to a driving source. A feeding chamber is formed between the screw rod and the inner wall of the shooting tube. The second countercurrent ring is installed between the screw rod and the mixing rod through the second baffle ring seat. The second countercurrent ring is used to seal the feeding chamber. A mixing chamber is formed between the mixing rod and the inner wall of the shooting tube. The first countercurrent ring is installed between the shooting screw head and the mixing rod through the first baffle ring seat. The first countercurrent ring is used to seal the mixing chamber. A feed hole and an air inlet hole are arranged on the shooting tube. The feed hole and the air inlet hole are respectively connected to the feed chamber and the mixing chamber.

2. A physical foaming molding injection device for an injection molding machine according to claim 1, characterized in that: The end of the injection tube is connected with a non-return nozzle, and the non-return nozzle comprises a nozzle head and a non-return rod. The end of the nozzle head is provided with an injection hole, and the non-return rod is fitted in the nozzle head.

3. A physical foaming molding injection device for an injection molding machine according to claim 2, characterized in that: The inner end of the check rod is tightly fitted with the inner diameter inclined surface of the nozzle head, and the outer end is fitted in the injection hole, and a pressurized area is formed between the check rod and the inner diameter of the nozzle head.

4. The physical foaming molding injection device of an injection molding machine according to claim 1, characterized in that: The outer wall of the mixing rod is provided with a plurality of evenly distributed protrusions.

5. A physical foaming molding injection device for an injection molding machine according to claim 4, characterized in that: There is a distance between the projection and the inner wall of the mixing chamber.

6. The physical foaming molding injection device of an injection molding machine according to claim 1, characterized in that: There is a gap between the first counter-flow ring and the first retaining ring seat, and there is a gap between the second counter-flow ring and the second retaining ring seat.

7. The physical foaming molding injection device of an injection molding machine according to claim 1, characterized in that: The mixing rod is penetrated and fixed on the screw rod, and the injection screw head is penetrated and fixed on the mixing rod.

8. The physical foaming molding injection device of an injection molding machine according to claim 1, characterized in that: The material inlet is connected to a material barrel.

9. The physical foaming molding injection device of an injection molding machine according to claim 1, characterized in that: The air inlet is connected to an air pipe, the air pipe is connected to a gas cylinder, and a control valve is arranged on the air pipe.

10. The physical foaming molding injection device of an injection molding machine according to claim 1, characterized in that: The first countercurrent ring is tightly fitted to the inner wall of the mixing chamber, and the second countercurrent ring is tightly fitted to the inner wall of the feeding chamber.

Images