Micro-bubble injection molding device with excess material recovery function

Abstract

The microbubble injection molding device comprises a main body, a reversing valve, a mixer and a cavity are arranged in the main body, an inner core is arranged in the cavity, a fixed piston rod is arranged in the inner core, a first channel is formed in a gap between the inner core and the cavity, and a second channel is formed in the gap between the inner core and the cavity. A gap between the inner core and the fixed piston rod forms a second channel, the first channel is connected with a master batch, the second channel is connected with the mixer, a movable piston rod is connected in the fixed piston rod in a sliding mode, a material returning channel is arranged in the movable piston rod, a first one-way valve is arranged at the end of the fixed piston rod, and a second one-way valve is arranged at the end of the fixed piston rod. A second one-way valve is arranged at the end of the movable piston rod, the material returning channel is connected with the mixer, the movable piston rod is connected with a driving mechanism, and the driving mechanism drives the movable piston rod to reciprocate in the fixed piston rod.

Description

Technical Field

[0001] The invention relates to a foaming injection molding device, in particular to a micro-foam injection molding device with residual material recovery. Background Art

[0002] The applicant's earlier patent: CN 115519724 A disclosed a microbubble injection molding device with residual material recovery, including a main body, which is connected to the cavity of the mold, and also includes an overflow recovery device. The main body is provided with a third channel, and the third channel connects the cavity and the overflow recovery device. The third channel is generally in a closed state. When the injection molding is completed, the third channel is opened, and the raw material in the cavity enters the overflow recovery device through the third channel under the action of pressure, and is discharged from the overflow recovery device for recovery.

[0003] After adding the overflow recovery device, the material injected into the mold can be squeezed out of the device under the action of internal pressure, which greatly improves the foaming rate inside the product, making the product lighter and saving more materials.

[0004] However, this type of microbubble injection molding device needs to be equipped with a special recovery device on the outside. On the one hand, it increases the cost and volume of the product, which is not conducive to the miniaturization of the product. On the other hand, the recovered residual material needs to be drawn out of the microbubble injection molding device and then filled into the device, which invisibly increases the length of the material liquid flow. In order to maintain the state of the material liquid and prevent solidification, a heating device needs to be added to the recovery device, which also increases energy consumption. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a microbubble injection molding device with waste material recovery, which can simplify the structure, reduce the volume of the product, and greatly reduce energy consumption.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a micro-bubble injection molding device with residual material recovery, comprising a main body, a reversing valve, a mixer and a chamber are arranged in the main body, an inner core is arranged in the chamber, a fixed piston rod is arranged in the inner core, a gap between the inner core and the chamber forms a first channel, a gap between the inner core and the fixed piston rod forms a second channel, the first channel is connected to the masterbatch, the second channel is connected to the mixer, a moving piston rod is slidably connected in the fixed piston rod, the moving piston rod has a return channel, the end of the fixed piston rod has a first one-way valve, the end of the moving piston rod has a second one-way valve, the return channel is connected to the mixer, the moving piston rod is connected to a driving mechanism, and the driving mechanism drives the moving piston rod to reciprocate in the fixed piston rod. When in use, the masterbatch is first injected into the cavity through the first channel, and then the foaming material mixed with air is injected through the second channel, the foaming material enters the masterbatch, and the masterbatch is stretched to fill the entire cavity, and the pressure is maintained for a period of time. During the pressure holding period, the foaming material overflows from the mold cavity under the action of the internal pressure. These overflowing foaming materials enter the interior of the fixed piston rod through the first one-way valve, and then when the movable piston rod reciprocates in the fixed piston rod, these foaming materials enter the return channel in the piston rod through the second one-way valve, and then enter the mixer through the return channel to complete the recycling. In this structure, the recycling of overflow materials is no longer through the outside, but integrated into the injection molding equipment, which greatly reduces the volume of the product, reduces costs, and is conducive to miniaturization. In addition, the recycled excess materials do not need to be sent out of the injection molding equipment, eliminating the trouble of setting up a heating mechanism outside and reducing energy consumption.

[0007] In the above technical solution, preferably, one end of the main body is connected to the flange through a connector, and a feed port is provided in the flange.

[0008] In the above technical solution, preferably, the inlet of the reversing valve is communicated with the feed port, and the two outlets of the reversing valve are communicated with the mixer and the first channel respectively.

[0009] In the above technical solution, preferably, a third one-way valve is arranged in the channel communicating between the reversing valve and the first channel.

[0010] In the above technical solution, preferably, a fourth one-way valve is arranged in the channel connecting the mixer and the second channel.

[0011] In the above technical solution, preferably, the outer ring of the main body has a heater.

[0012] In the above technical solution, preferably, the mixer includes an outer cylinder and a mixing shaft, the mixing shaft is arranged in the outer cylinder, one end of the mixing shaft extends out of the outer cylinder, a sprocket is arranged at the place where the mixing shaft extends out of the outer cylinder, and the driving motor drives the sprocket to rotate through the chain.

[0013] The beneficial effect of the present invention is that, in this structure, the overflow material is no longer recovered through the outside, but is integrated inside the injection molding equipment, which greatly reduces the volume of the product, reduces the cost, and is conducive to miniaturization. In addition, the recovered excess material does not need to be sent out of the injection molding equipment, which saves the trouble of setting up a heating mechanism outside and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 yes Figure 1 A partial enlarged schematic diagram of . DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: See also Figure 1-2 A microbubble injection molding device with residual material recovery includes a main body 3, one end of the main body 3 is connected to a flange 1 through a connector 2, and a feed port 1a is provided in the flange 1. The outer ring of the main body 3 has a heater 16.

[0017] The main body 3 is provided with a reversing valve 4, a mixer 5 and a chamber 3a, and the inlet of the reversing valve 4 is communicated with the feed port 1a.

[0018] The mixer 5 includes an outer cylinder 51 and a mixing shaft 52, wherein the mixing shaft 52 is disposed in the outer cylinder 51, and one end of the mixing shaft 52 extends out of the outer cylinder 51. A sprocket 53 is disposed where the mixing shaft 52 extends out of the outer cylinder 51, and a driving motor 54 drives the sprocket 53 to rotate via a chain 55. The outer cylinder 51 has an air inlet 17.

[0019] The chamber 3a is provided with an inner core 14, and a fixed piston rod 10 is provided in the inner core 14. The gap between the inner core 14 and the chamber 3a forms a first channel 31, and the gap between the inner core 3 and the fixed piston rod 10 forms a second channel 32. The first channel 31 is connected to the masterbatch, and the second channel 32 is connected to the mixer 5. The two outlets of the reversing valve 4 are respectively connected to the mixer 5 and the first channel 31. A third one-way valve 8 is provided in the channel of the reversing valve 4 connected to the first channel 31. A fourth one-way valve 15 is provided in the channel of the mixer 5 connected to the second channel 32.

[0020] A movable piston rod 9 is slidably connected inside the fixed piston rod 10, and a return channel 91 is provided inside the movable piston rod 9. A first one-way valve 12 is provided at the end of the fixed piston rod 10, and a second one-way valve 8 is provided at the end of the movable piston rod 9. The return channel 91 is connected to the mixer 5, and the movable piston rod 9 is connected to a driving mechanism 6, and the driving mechanism 6 drives the movable piston rod 9 to reciprocate inside the fixed piston rod 10.

[0021] When in use, the masterbatch is first injected into the cavity through the first channel, and then the foaming material mixed with air is injected through the second channel. The foaming material enters the masterbatch and expands the masterbatch to fill the entire cavity, and the pressure is maintained for a period of time. During the pressure maintenance period, the foaming material overflows from the cavity under the action of the internal pressure, and these overflowing foaming materials enter the interior of the fixed piston rod through the first one-way valve. Then, when the movable piston rod reciprocates in the fixed piston rod, these foaming materials enter the return channel in the piston rod through the second one-way valve, and then enter the mixer through the return channel to complete the recycling.

[0022] In this structure, the overflow material is no longer recovered through the outside, but integrated into the injection molding equipment, which greatly reduces the volume of the product, reduces the cost, and is conducive to miniaturization. In addition, the recovered excess material does not need to be sent out of the injection molding equipment, eliminating the trouble of setting up a heating mechanism outside and reducing energy consumption.

Claims

1. A microbubble injection molding device with residual material recovery, comprising a main body, a reversing valve, a mixer and a chamber are arranged in the main body, an inner core is arranged in the chamber, a fixed piston rod is arranged in the inner core, a gap between the inner core and the chamber forms a first channel, a gap between the inner core and the fixed piston rod forms a second channel, the first channel is connected to the masterbatch, and the second channel is connected to the mixer, characterized in that: A movable piston rod is slidably connected inside the fixed piston rod, and a return channel is provided inside the movable piston rod. A first one-way valve is provided between the return channel and the end of the fixed piston rod, and a second one-way valve is provided at the end of the movable piston rod. The return channel is connected to the mixer, and the movable piston rod is connected to a driving mechanism, which drives the movable piston rod to reciprocate inside the fixed piston rod.

2. The microbubble injection molding device with residual material recovery according to claim 1, characterized in that: One end of the main body is connected to a flange through a connector, and a feed port is provided in the flange.

3. The microbubble injection molding device with residual material recovery according to claim 2, characterized in that: The inlet of the reversing valve is communicated with the feed port, and the two outlets of the reversing valve are communicated with the mixer and the first channel respectively.

4. The microbubble injection molding device with residual material recovery according to claim 1, characterized in that: A third one-way valve is arranged in the channel communicating between the reversing valve and the first channel.

5. The microbubble injection molding device with residual material recovery according to claim 1, characterized in that: A fourth one-way valve is arranged in the channel of the mixer communicating with the second channel.

6. The microbubble injection molding device with residual material recovery according to claim 1, characterized in that: The outer ring of the main body has a heater.

7. The microbubble injection molding device with residual material recovery according to claim 1, characterized in that: The mixer comprises an outer cylinder and a mixing shaft, wherein the mixing shaft is arranged in the outer cylinder, one end of the mixing shaft extends out of the outer cylinder, a sprocket is arranged at the place where the mixing shaft extends out of the outer cylinder, and a driving motor drives the sprocket to rotate through a chain.

Images