TWI886453B - Pressure controlling foam injection molding machine - Google Patents

Abstract

A pressure controlling foam injection molding machine includes a base, a first mold, a second mold, a first lifting device, a material feeding device, and a second lifting device. The base has a containing space, a sliding door, an air intake part, an exhausting part, and a material inlet. The first mold has a material channel. The second mold has a blank recess. When the second lifting device controls the material feeding device to be aligned with the material inlet, the sliding door seals the containing space. The first lifting device leaves a gap between the second mold and the first mold. The exhausting part pumps out the air in the containing space, so that the containing space becomes a vacuum environment. The material feeding device injects the foaming material from the material inlet through the material channel into the blank recess. The first lifting device combines the first and the second molds, and the second lifting device drives the material feeding device away from the material inlet. The air intake part inputs an air pressure corresponding to the needed foaming degree, whereby the foaming materials is molded into a finished product under the air pressure.

Description

Controlled Pressure Foam Injection Molding Machine

The present invention relates to a field related to a foaming process, and in particular to a pressure-controlled foaming injection molding machine that can complete the injection, foaming and molding steps in a single machine.

As shown in FIG. 1 , the conventional EVA foam sole manufacturing process is to inject EVA plastic into the mold cavity of a foaming mold 1 to form a raw material embryo 2, then place the raw material embryo 2 in a first compression molding mold 3, and heat the first compression molding mold 3 to cause the raw material embryo 2 in the mold cavity to undergo crosslinking and foaming to form a foamed embryo 4, at which time the foamed embryo 4 will expand to about 1.8 times the size of the raw material embryo 2; then take out the foamed embryo 4 and cool it in an uncontrolled pressure environment to set it, and then place the foamed embryo 4 in a closed position. The foam embryo 4 is inserted into the second compression mold 5 of the required size, and the mold cavity size of the second compression mold 5 is 1.6 times the size of the raw embryo 2. The foam embryo 4 will be heated and compressed in the second compression mold 5 for the second time. The foam embryo 4 will form patterns and grooves on the surface according to the patterns of the second compression mold 5. After molding, it is taken out and cooled and formed into a finished product 6 under the condition of no pressure control, room temperature or temperature control.

However, since the external atmospheric pressure will change with many factors such as seasons, weather, and temperature, the size and temperature of the external atmospheric pressure will affect the volume of the foamed preform 4 after it is shaped; for example, when the external atmospheric pressure is smaller, the foamed preform 4 will expand more during the process, and the finished product 6 is likely to be larger than expected; on the contrary, when the external atmospheric pressure is larger, the foamed preform 4 will expand less during the process, and the size of the finished product 6 will be smaller, which will lead to the problem of finished product size defects.

Furthermore, during the manufacturing process of the EVA foam sole, a large number of spherical airbags 7 are generated by the process of internal bubble precipitation. The airbags 7 are important elastic structures of the EVA foam sole. The full-shaped airbags 7 can produce good supporting elasticity, thereby making the sole have elastic shock absorption. However, in the known EVA foam sole manufacturing process, two heating steps are required. The first heating for foaming will expand the foaming embryo 4 to 1.8 times the size of the raw material embryo 2, and then the second heating and molding will be pressurized to shrink the foaming embryo 4 from 1.8 times the size of the raw material embryo 2 to 1.6 times. The airbags 7 generated by the foaming inside the EVA will expand to an oversaturated state during the first heating and foaming process, and then during the second heating and molding, the airbags 7 are compressed and shrink. In this way, the airbag 7 of the finished product 6 will be over-foamed due to the compression and shrinkage after expansion during the manufacturing process, causing the outer wall of the airbag 7 to shrink and become uneven and incomplete in shape (as shown in Figure 2). When the airbag 7 is incomplete in shape, it cannot generate sufficient elastic support, which will cause the compression of the finished sole 6 to be poor, and the elasticity and support are insufficient, affecting the performance of the finished shoe, discomfort to wear, and even the sole is prone to crooked, deformed and other defects after wearing for a period of time.

In addition, in the known EVA foam sole production process, each size of sole must be matched with three sets of molds of different specifications and uses to complete production. Therefore, before producing each type of sole, the sole manufacturer needs to spend a lot of money to purchase a large number of molds to meet the needs of soles of different sizes, resulting in a significant increase in production and operating costs.

In order to improve the aforementioned EVA foam sole manufacturing process, relevant industry players have proposed a controlled pressure molding method for precisely controlling the size of the foamed material, as disclosed in the Republic of China Patent No. I690406, which includes the following steps: (A) preparing a molding device, (B) placing the foaming material in a mold cavity formed by closing the upper and lower molds, covering the mold with a first air hood and evacuating the air, (C) crosslinking the foaming material contained in the mold cavity, Foaming is performed to form a foamed object. (D) the vacuum is broken and the first air hood is moved upward away from the upper and lower molds, and then the upper mold is moved upward away from the lower mold. (E) the foamed object is moved from the molding unit to the container of the cooling and setting unit by the conveying unit. (F) the second air hood is moved downward to cover the container, and then positive pressure is applied to cool and set the foamed object in a positive pressure environment. (G) the second air hood is removed and the cooled and set foamed object is taken out.

Although the aforementioned patent can reduce the number of soles of each size in the manufacturing process from 3 to 2, it still requires a considerable number of molds.

Furthermore, the known method of filling the foaming material is to fill the material from the front and rear ends of the mold. Since the foaming material itself has high viscosity and poor fluidity, when the foaming material flows from one end of the mold to the other end, not only does it take a long time to fill, but it often causes insufficient filling and defects such as voids.

It is also known that a material channel is provided at the front/rear end of the mold, and the foaming raw material will be injected into the mold through the material channel. After the injection of the foaming raw material is completed, residual material will remain in the material channel, and the residual material will be formed at the front/rear end of the finished product together with the foaming raw material in the mold. In this way, further processing is required to cut off the residual material of the finished product. Since the material channel is located at the front and rear ends of the sole that are visible, there will be cutting marks on the finished product after the residual material is cut off, and there is a concern that it will affect the appearance of the finished product.

In order to solve the above problems, the present invention provides a pressure-controlled foaming injection molding machine that can complete injection, foaming and molding under a single machine and a single set of molds, effectively reducing manufacturing time and manufacturing costs.

One embodiment of the present invention provides a pressure-controlled foam injection molding machine, which includes: a base, a containing space is provided inside the base, a sliding door, an air inlet and an air exhaust are provided on the side of the base, and a material inlet is provided on the top, the sliding door can open or close the containing space, the air inlet and the air exhaust are connected to the containing space, wherein the air inlet can input a gas pressure, and the air exhaust can extract the gas in the containing space; a mold set is arranged in the containing space of the base, and the mold set has a first The first mold is provided with a material channel, the second mold is provided with a blank groove, the material channel is connected to the material inlet and the blank groove; a first lifting device is arranged on the base and connected to the second mold of the mold set, the first lifting device can drive the second mold close to or away from the first mold; an injection device is mounted on the base, the injection device has an injection power source and a shooting gun which are connected to each other, the injection power source is provided and provides a foaming raw material to the shooting gun; and a second lifting device, which is connected to the shooting gun The second lifting device can control the gun to correspond to or be far away from the feed inlet. When the second lifting device controls the gun to correspond to the feed inlet, the sliding door closes the accommodating space, the first lifting device drives the second mold to approach the first mold and leave a gap between the second mold and the first mold, and the exhaust part extracts the gas in the accommodating space and the embryo tank, so that the accommodating space and the embryo tank are in a vacuum environment; when the accommodating space and the embryo tank are in a vacuum environment, the injection power source controls the gun to inject the foaming raw material from the feed inlet through the material channel into the embryo tank, and the foaming The raw material is foamed in the embryo tank under a vacuum environment, and the first lifting device drives the second mold to close the first mold. The second lifting device controls the gun to move away from the inlet. The air intake inputs the corresponding gas pressure according to the foaming degree requirement, and then the first lifting device drives the second mold away from the first mold to complete the mold opening operation, so that the foaming raw material expands to a predetermined appropriate degree under the gas pressure and foams into a finished product; and a cooling device, which can cool and shape the foamed finished product.

Through the above, the present invention can complete the injection, foaming and molding processes under a single machine and a single mold set; thereby improving the conventional manufacturing process that requires multiple foaming or waiting for cooling time, which can effectively shorten the manufacturing time and reduce the mold cost.

Furthermore, the present invention further controls the foaming degree of the foaming raw materials by inputting different gas pressures, and increases or decreases the size of the finished product after being finalized; for example, when the present invention uses standard gas pressure for production, a single mold set can accurately produce standard-sized finished products according to the design. When the same mold set uses a larger gas pressure, it can control the size of the finished product to be reduced by half a size, and similarly, when the same mold set uses a smaller gas pressure, it can control the size of the finished product to be reduced by half a size. In this way, the present invention only needs one mold set to complete the three sizes of finished products, namely standard, enlarged and reduced. Compared with the traditional single size that requires three mold sets, the present invention can greatly reduce the number of mold sets required for production, and even only needs to use 1/3~1/9 of the number of mold sets.

<Learning>

1: Foaming mold

2: Raw embryo

3: The first compression mold

4: Foaming embryo

5: Second compression mold

6: Finished product

7: Airbag

<This invention>

100: Pressure-controlled foam injection molding machine

10: Base

11: Top

111: Feeding port

12: Bottom surface

13: First side

14: Second side

15: The third side

16: Storage space

17: Sliding door

18: Air intake

19: Exhaust section

20:Mold set

21: First mold

211: Material Road

22: Second mold

221: embryonic groove

30: First lifting device

31: The first power source

32: First piston rod

40: Injection device

41:Fixed bracket

42: Injection power source

421: Cylinder cavity

422: Stirring screw

423: Motor

424: Piston cylinder

43: Shooting

50: Second lifting device

51:Connection frame

52: Second power source

53: Second piston rod

60: Turn on/off device

61: The first driving source

62: Second driving source

63: Capping

64: Control parts

70: Finished product

71: Airbag

80: Cooling device

90: Controllable air pressure space

M: Foaming raw materials

Figure 1 is a schematic diagram of the known manufacturing process.

Figure 2 is a schematic diagram of the cross section of the known structure.

Figure 3 is a schematic diagram of the three-dimensional appearance of the present invention.

Figure 4 is a schematic diagram of a cross-sectional embodiment of the present invention (I), showing that the injection power source controls the gun to inject the foaming raw material from the feed port through the material channel into the embryo tank, and the first mold and the second mold have not yet been molded.

Figure 5 is a schematic diagram of a cross-sectional embodiment of the present invention (II), showing that the injection power source controls the gun to inject the foaming raw material from the feed port through the material channel into the embryo tank, and the first mold and the second mold have not yet been completely molded.

Figure 6 is a schematic diagram of a cross-sectional embodiment of the present invention (III), showing that the injection power source controls the gun to inject the foaming raw material from the feed port through the material channel into the embryo tank, and the first mold and the second mold are molded together.

Figure 7 is a schematic diagram of a cross-sectional embodiment of the present invention (IV), showing that the injection power source controls the gun to move away from the feed port, the opening and closing device closes the feed port and the material channel, and the gas pressure is input from the air intake part.

Figure 8 is a schematic diagram of a cross-sectional embodiment of the present invention (V), showing the opening and closing device closing the material channel.

Figure 9 is a schematic diagram of a cross-sectional embodiment of the present invention (VI), showing that the finished product is controlled by gas pressure to expand to an appropriate degree.

Figure 10 is a schematic diagram of the cross-section of the finished product structure of the present invention.

Figure 11 is a schematic diagram of another embodiment of the present invention.

In order to facilitate the explanation of the central idea of the present invention in the above invention content column, a specific embodiment is used for illustration. Various objects in the embodiment are depicted according to the proportion, size, deformation or displacement suitable for the description, rather than being drawn according to the proportion of the actual element.

The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only the directions of the diagrams; therefore, the directional terms used are used to explain and understand the present invention, rather than to limit the present invention, and it is necessary to explain them first.

Please refer to Figures 3 to 10. The present invention provides a controlled pressure foam injection molding machine 100, which includes: a base 10, which is roughly rectangular, and the base 10 has a top surface 11, a bottom surface 12, two first side surfaces 13, a second side surface 14 and a third side surface 15. The top surface 11 and the bottom surface 12 are vertically connected to the two first side surfaces 13, the second side surface 14 and the third side surface 15. The two first side surfaces 13 are vertically connected between the second side surface 14 and the third side surface 15. The second side surface 14 and the third side surface 15 are arranged in parallel, as shown in Figure 3.

The base 10 has a storage space 16 inside, a material inlet 111 is provided on the top surface 11 of the base 10, a sliding door 17 is provided on each of the two first side surfaces 13 of the base 10, and an air inlet 18 and an air exhaust 19 are provided on the second side surface 14 of the base 10. The sliding door 17 can open or close the storage space 16, and the air inlet 18 and the air exhaust 19 are connected to the storage space 16; in the embodiment of the present invention, the number of the material inlet 111 is two, as shown in FIG5.

When the sliding door 17 closes the accommodating space 16, the air intake 18 can input a gas pressure, or the exhaust 19 can extract the gas in the accommodating space 16; in the embodiment of the present invention, the air intake 18 is connected to the air pressure source (not shown in the figure), and the pressure value of the gas pressure input to the air intake 18 by the air pressure source can be adjusted according to demand; the exhaust 19 is connected to the exhaust source (not shown in the figure), and the exhaust source can extract the gas in the accommodating space 16 through the exhaust 19, so that the accommodating space 16 is in a vacuum state.

A mold set 20 is arranged in the accommodating space 16 of the base 10. The mold set 20 has a first mold 21 and a second mold 22. The first mold 21 has a material channel 211, and the second mold 22 has a recessed embryo groove 221. The material channel 211 connects the material inlet 111 and the embryo groove 221; wherein the material channel 211 is connected from the material inlet 111 of the top surface 11 to the center of the embryo groove 221 in a vertical direction; in the embodiment of the present invention, the first mold 21 has two material channels 211; the second mold 22 has two embryo grooves 221, and each embryo groove 221 has a pattern. Furthermore, the first mold 21 and the second mold 22 can be provided with/externally connected to at least one heating device, such as an electric heating/liquid heating or oil heating device, for heating the first mold 21 and the second mold 22 during the processing process.

A first lifting device 30 is disposed on the base 10 and connected to the second mold 22 of the mold set 20. The first lifting device 30 can drive the second mold 22 to approach or move away from the first mold 21, as shown in Figures 4 and 9.

The first lifting device 30 has a first power source 31 and a first piston rod 32. The first power source 31 is disposed on the bottom surface 12 of the base 10. The first piston rod 32 is connected between the first power source 31 and the second mold 22. The first power source 31 can drive the first piston rod 32 to reciprocate to drive the second mold 22 to approach or move away from the first mold 21. In the embodiment of the present invention, the first power source 31 can drive the first piston rod 32 to reciprocate up and down when viewed from the direction of FIG. 3. The first power source 31 is a hydraulic cylinder.

An injection device 40 is mounted on the base 10. The injection device 40 has a fixed frame 41, an injection power source 42 and a gun 43. One end of the fixed frame 41 is connected to the third side surface 15 of the base 10, and the other end of the fixed frame 41 is connected to the injection power source 42. The injection power source 42 is connected to the gun 43. The injection power source 42 contains and provides a foaming material M to the gun 43. In the embodiment of the present invention, the foaming material M is composed of EVA, a foaming agent and a bridging agent.

The injection power source 42 has a cylinder chamber 421, a stirring screw 422, a motor 423 and a piston cylinder 424. The cylinder chamber 421 and the piston cylinder 424 are respectively connected to the fixed frame 41. The stirring screw 422 is arranged between the cylinder chamber 421 and the motor 423. The cylinder chamber 421 is connected to the shooting gun 43. The cylinder chamber 421 is arranged to accommodate the foaming raw material M. The motor 423 can drive the stirring screw 422 to operate and stir the foaming raw material M, and the piston cylinder 424 can control the foaming raw material M to be provided from the cylinder chamber 421 to the shooting gun 43 for output.

A second lifting device 50 is mounted on the base 10 and connected to the gun 43. The second lifting device 50 can control the gun 43 to correspond to or move away from the feed port 111. The second lifting device 50 has a connecting frame 51, a second power source 52 and a second piston rod 53. The connecting frame 51 is connected to the two first side surfaces 13 of the base 10 and the second power source 52 and the second piston rod 53 are mounted above the top surface 11 of the base 10, as shown in Figures 3 and 4; the second piston rod 53 is connected between the second power source 52 and the gun 43. The second power source 52 can drive the second piston rod 53 to drive the gun 43 from above the top surface 11 of the base 10 to approach or move away from the feed port 111.

An opening and closing device 60 is disposed on the top surface 11 of the base 10. The opening and closing device 60 has a first driving source 61, a second driving source 62, a cover 63 and a control member 64. The first driving source 61 can control the cover 63 to open or close the feed port 111, and the second driving source 62 can control the control member 64 to open or close the feed channel 211. In the embodiment of the present invention, the first driving source 61 and the second driving source 62 are pneumatic cylinders; the cover 63 is in the shape of a disc.

A cooling device 80 can directly or indirectly cool the accommodating space 16, wherein the cooling device 80 can cool and shape the foamed finished product; in a possible embodiment, the cooling device 80 is a cooling water mist spray device or a cooling liquid spray device.

Please refer to Figures 3 to 9. In the embodiment of the present invention, when it is necessary to manufacture through the controlled pressure foam injection molding machine 100, it can be carried out through the following steps, and each step can be carried out simultaneously or successively. The operating steps and sequence of the present invention can be adjusted according to needs and are not limited to the following steps and sequence.

Step 1: The first driving source 61 controls the sealing cover 63 to open the feed port 111, the second driving source 62 controls the operating member 64 to open the material channel 211, and the second lifting device 50 controls the shooting gun 43 from the top surface 11 of the base 10 to correspond to the feed port 111 (from the direction of Figure 4, the shooting gun 43 is downward to correspond to the feed port 111), and the shooting gun 43 is closely fitted at the material channel 211 from the feed port 111, and the sliding doors 17 close the accommodating space 16.

Step 2: The first lifting device 30 drives the second mold 22 close to the first mold 21 and leaves a gap between the second mold 22 and the first mold 21. At this time, the first mold 21 and the second mold 22 have not yet been closed, as shown in Figures 4 and 5.

Step 3: The gas in the accommodating space 16 is extracted through the exhaust part 19, so that the accommodating space 16 is in a vacuum environment, as shown in Figures 4 and 5.

Step 4: When the accommodating space 16 is in a vacuum environment, the injection power source 42 controls the gun 43 to inject the foaming material M from the feed port 111 through the material channel 211 into the embryo tank 221, and when the embryo tank 221 has been filled with 7 to 8 points of the foaming material M, the first lifting device 30 drives the second mold 22 to gradually close the mold with the first mold 21, and during the closing process of the second mold 22 and the first mold 21, the gun 43 continues to inject the material into the embryo tank 221, wherein the exhaust part 19 continues to extract the gas in the accommodating space 16, as shown in Figures 5 and 6. In other possible embodiments, the first mold 21 and the second mold 22 can be vacuumed first and then closed, and then the foaming material M is injected from the feed port 111 through the material channel 211 into the embryo tank 221.

Step 5: The second lifting device 50 controls the gun 43 to move away from the feed port 111 (from the direction of Figure 7, the gun 43 is pulled upward), and the first driving source 61 can control the cover 63 to close the feed port 111, and the second driving source 62 can control the control member 64 to close the material channel 211. At this time, the accommodating space 16 is in a completely closed state, as shown in Figure 7.

Step 6: Input the corresponding gas pressure through the air inlet 18 according to the foaming degree requirement, so that the foaming material M is foamed and formed into a finished product 70 under the gas pressure, and the surface of the finished product 70 can correspond to the pattern in the embryo groove 221. The pressure value of the gas pressure input by the air inlet 18 can be adjusted according to the foaming degree (volume size) requirement of the finished product 70, as shown in Figures 7 to 9.

Step 7: The first lifting device 30 controls the second mold 22 to move away from the first mold 21 to complete the mold opening operation, and the finished product 70 will expand again to a predetermined appropriate degree (required volume) under a predetermined gas pressure, as shown in Figures 3 and 9; in the embodiment of the present invention, the finished product 70 is a shoe sole.

Step 8: Cool the finished product 70 with a cooling device 80. In a possible embodiment, the cooling device 80 is a cooling water mist spraying device. By directly spraying cooling water mist on the finished product 70 or the accommodating space 16, the finished product 70 can be cooled and shaped at an appropriate level (required volume). After the shaping and cooling are completed, the sliding door 17 will open to provide the finished product 70 for removal.

Please refer to Figure 10. The finished product 70 of the present invention can be foamed once under appropriate pressure control without the problem of over-foaming and then shrinking. Each airbag 71 of the finished product 70 can be roughly a complete circle, so as to provide good elasticity and allow the finished product 70 to have good compression distortion.

Furthermore, by installing the cooling device 80, the finished product 70 can be properly cooled and shaped after forming a complete airbag 71, thereby avoiding problems such as volume changes of the finished product 70 or defects of the airbag 71 due to insufficient cooling.

Please refer to FIG. 11 . In other possible embodiments, the cooling device 80 can also be separately set in a controllable air pressure space 90 . The finished product 70 after step 7 is taken out from the containing space 16 by a robot or manually, and the cooling device 80 is used to cool the finished product 70 in the controllable air pressure space 90 . Furthermore, the controllable air pressure space 90 can include the containing space 16 therein, or can be set independently from the containing space 16 .

In other possible embodiments, the inlet 111 can also be arranged on the side of the base 10 (for example, the second side 14 and the third side 15), relative to the side of the first mold 21 and the second mold 22, and the material channel 211 extends horizontally to the embryo groove 221, and the injection device 40 and the opening and closing device 60 can also be arranged at the corresponding position on the side of the machine.

In summary, the present invention has the following effects:

1. The pressure-controlled foam injection molding machine 100 of the present invention can complete the processes of injection, foaming and molding under a single machine and a single mold set 20; thereby effectively shortening the manufacturing time and reducing the mold cost.

2. The pressure-controlled foaming injection molding machine 100 of the present invention accurately controls the foaming degree of the foaming raw material M by inputting different gas pressures, and completes the shaping under the control of gas pressure; thereby, the precise size and surface pattern of the finished product 70 can be obtained to improve the yield of the finished product 70.

3. The pressure-controlled foam injection molding machine 100 of the present invention only needs one set of molds 20 to complete the foam molding operation, which greatly reduces the mold setting cost (the same shoe type and size is reduced from multiple pairs to one pair).

4. The pressure-controlled foaming injection molding machine 100 of the present invention can control the foaming ratio and the size of the finished product 70 by changing the positive pressure value of the gas pressure input from the air inlet 18. In this way, the size of the finished product 70 can be reduced or increased by half a size by reducing or increasing (compared to the standard pressure) the same mold set 20, which is equivalent to the same mold set 20 of the present invention being used as a mold of a small half size, a standard size, and a large half size, thereby greatly reducing the mold setting cost.

5. The cooling device 80 of the present invention can ensure that the finished product 70 can be maintained at an appropriate air pressure to complete the cooling and shaping process. In addition to reducing the probability of the finished product 70 having volume change defects due to insufficient cooling, it can also accelerate the cooling speed and reduce the time required for the process.

6. In one embodiment of the present invention, the feeding direction of the controlled pressure foaming injection molding machine 100 can be injected from the top of the first mold 21, and then diffused to the center of the embryo groove 221 to the surrounding, effectively shortening the filling path length of the foaming material M, and ensuring that the embryo groove 221 of the second mold 22 is accurately and quickly filled, so that the efficiency of the manufacturing process can be effectively improved.

7. The feeding direction of the pressure-controlled foaming injection molding machine 100 of the present invention is different from the conventional method of filling from the end of the mold. Instead, it is injected from the top of the first mold 21 and filled in the center of the embryo groove 221. This can not only shorten the flow path of the foaming raw material and reduce the time required for filling, but also help to make the filling in the embryo groove 221 uniform. In addition, negative pressure suction (vacuum state) is used to assist in filling, which helps to accelerate the flow of the foaming raw material M in the embryo groove 221, and can fill the embryo groove 221 more evenly, effectively avoiding defects such as cavities caused by insufficient filling.

8. The feeding direction of the controlled pressure foam injection molding machine 100 of the present invention is that after the filling is done at the center of the embryo tank 221, the remaining material in the material channel 211 will be formed at the bonding surface between the finished product 70 and the shoe upper. Even if the traces of the remaining material are cut off, it will not affect the appearance.

The above-mentioned embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. All modifications or changes that do not violate the spirit of the present invention are within the scope of protection of the present invention.

100: Pressure-controlled foam injection molding machine

10: Base

11: Top

111: Feeding port

12: Bottom surface

14: Second side

15: The third side

16: Storage space

17: Sliding door

19: Exhaust section

20:Mold set

21: First mold

211: Material Road

22: Second mold

221: embryonic groove

30: First lifting device

31: The first power source

32: First piston rod

40: Injection device

41:Fixed bracket

42: Injection power source

421: Cylinder cavity

422: Stirring screw

423: Motor

424: Piston cylinder

43: Shooting

50: Second lifting device

51:Connection frame

52: Second power source

53: Second piston rod

60: Turn on/off device

61: The first driving source

63: Capping

80: Cooling device

M: Foaming raw materials

Claims (10)

A controlled pressure foam injection molding machine comprises: A base, which has a storage space inside, and a sliding door, an air inlet, an air exhaust and a material inlet are arranged on the side of the base, the sliding door can open or close the storage space, the air inlet and the air exhaust are connected to the storage space, wherein the air inlet can input a gas pressure, and the air exhaust can extract the gas in the storage space; A mold set, which is arranged in the storage space of the base, the mold set has a first mold and a second mold, the first mold is provided with a material channel, the second mold is concave with a embryo groove, the material channel is connected to the material inlet and the embryo groove; A first lifting device, which is arranged on the base and connected to the second mold of the mold set, and the first lifting device can drive the second mold to approach or move away from the first mold; A material injection device, which is mounted on the base, and the material injection device has an injection power source and a shooting gun that are interconnected, and the injection power source accommodates and provides a foaming material to the shooting gun; a second lifting device connected to the gun, the second lifting device can control the gun to correspond to or be away from the feed inlet, wherein when the second lifting device controls the gun to correspond to the feed inlet, the sliding door closes the accommodating space, the first lifting device drives the second mold to approach the first mold and leave a gap between the second mold and the first mold, the exhaust part extracts the gas in the accommodating space and the embryo tank, so that the accommodating space and the embryo tank are in a vacuum environment; when the accommodating space and the embryo tank are in a vacuum environment, the injection power source controls the gun to The foaming raw material is injected into the embryo tank through the material channel from the feed port, and the foaming raw material is foamed in the embryo tank in a vacuum environment, and the second mold is driven by the first lifting device to close the mold with the first mold, and the second lifting device controls the gun to move away from the feed port. The air intake part inputs the corresponding gas pressure according to the foaming degree requirement, and then the first lifting device drives the second mold away from the first mold to complete the mold opening operation, so that the foaming raw material expands to a predetermined appropriate degree under the gas pressure to foam and form a finished product; and a cooling device, which can cool and shape the foamed finished product. A controlled pressure foam injection molding machine as described in claim 1, wherein the first lifting device has a first power source and a first piston rod, the first piston rod is connected between the first power source and the second mold, and the first power source can drive the first piston rod to drive the second mold closer to or away from the first mold. As described in claim 1, the second lifting device has a second power source and a second piston rod, the second piston rod is connected between the second power source and the shooting gun, and the second power source can drive the second piston rod to drive the shooting gun closer to or away from the feeding port. The pressure-controlled foam injection molding machine as described in claim 1 or 3 further comprises an opening and closing device disposed on the base. The opening and closing device has a first driving source and a cover. The first driving source can control the cover to open or close the feed port. As described in claim 4, the controlled pressure foaming injection molding machine, wherein the opening and closing device further has a second driving source and a control member, and the second driving source can control the control member to open or close the material channel. As described in claim 1, the controlled pressure foam injection molding machine, wherein the injection device further has a fixed frame, one end of the fixed frame is connected to the base, and the other end of the fixed frame is connected to the injection power source. A pressure-controlled foaming injection molding machine as described in claim 6, wherein the injection power source has a cylinder cavity, a stirring screw and a motor; the cylinder cavity is connected to the fixed frame, the stirring screw is arranged between the cylinder cavity and the motor, the cylinder cavity is connected to the shooting gun, the cylinder cavity contains the foaming raw material, and the motor can drive the stirring screw to operate and stir the foaming raw material. As described in claim 7, the controlled pressure foaming injection molding machine, wherein the injection power source further comprises a piston cylinder, which is connected to the fixing frame and can control the foaming raw material to be provided from the cylinder cavity to the shooting gun for output. As described in claim 1, the controlled pressure foaming injection molding machine, wherein the feed port is arranged on the top surface of the base, and the material channel is connected from the feed port on the top surface to the center of the embryo groove in a vertical direction. A controlled pressure foam injection molding machine as described in claim 1, wherein the cooling device is arranged in the accommodating space, and the cooling device is a cooling water mist spraying device or a cooling liquid spraying device.

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