Injection molding device for plastic package for food

Abstract

The invention relates to the technical field of injection molding, and particularly discloses an injection molding device for plastic packages for food, which comprises a worktable and a fixed mold, a fixed seat is fixedly mounted at the top end of one side of the worktable, the fixed mold is fixedly mounted in the middle of the top end of the worktable, and a first mold is fixedly mounted on the side wall of the fixed mold; four guide rods are fixedly connected between the fixed mold and the fixed seat, a movable mold is slidably connected to the guide rods, a mold back plate is fixedly installed on the side wall of the side, close to the fixed mold, of the movable mold, a movable cavity is formed in one side of the mold back plate, and a demolding assembly is arranged in the movable cavity; the top end and the bottom end of the movable mold are rotationally connected with two second connecting rods, the tail ends of each first connecting rod and the corresponding second connecting rod are rotationally connected, and a demolding mechanism is arranged between the two second connecting rods. And the demolding mechanism and the demolding assembly are matched with each other and are jointly driven only through the second connecting rod, and the characteristics of high efficiency, energy conservation and safety are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to an injection molding device for plastic packaging of food. Background Art

[0002] Food is usually packaged in soft plastic containers, which can protect the food and save costs. The manufacture of plastic packaging requires the use of injection molding equipment.

[0003] The injection molding device injects the molten plastic raw material into the mold through a screw injection machine, and takes the molded plastic packaging out of the mold after cooling. However, the existing injection molding device has the problem of not being able to effectively perform the demolding operation, which will cause the adverse effect of a long demolding time. In order to improve the demolding efficiency during demolding, additional auxiliary demolding equipment is often used. This method will also increase the probability of damage to the molded plastic packaging and affect the product qualification rate. At the same time, the additional equipment will also increase energy consumption, and it is also more likely to have equipment maintenance and repairs that affect production. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose an injection molding device for plastic packaging of food.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An injection molding device for plastic packaging of food, comprising a workbench and a fixed mold, wherein a fixed seat is fixedly installed at the top of one side of the workbench, a fixed mold is fixedly installed at the middle of the top of the workbench, a first mold is fixedly installed at the side wall of the fixed mold, four guide rods are fixedly connected between the fixed mold and the fixed seat, a movable mold is slidably connected to the guide rod, a mold back plate is fixedly installed at the side wall of the movable mold close to the fixed mold, a movable cavity is opened at one side of the mold back plate, a demoulding component is arranged in the movable cavity, a hollow cavity is opened at one side of the movable mold close to the fixed seat, a control mechanism is arranged in the hollow cavity, three groups of first connecting rods are rotatably connected at the top and bottom of the fixed seat, two groups of second connecting rods are rotatably connected at the top and bottom of the movable mold, each group of first connecting rods is rotatably connected to the end of the second connecting rod, and a demoulding mechanism is arranged between the two groups of second connecting rods;

[0007] The demoulding mechanism comprises an air cylinder and a piston. Two mutually symmetrical pistons are rotatably connected between the two sets of second connecting rods. A hollow opening is provided on the side wall of the hollow cavity. Two air cylinders are rotatably connected in the middle of the hollow opening. The ends of the two pistons are respectively slidably connected in the two air cylinders.

[0008] The demoulding assembly comprises a movable plate and demoulding columns, the movable cavity side wall is slidably connected with the movable plate, and the movable plate side wall is fixedly connected with six demoulding columns;

[0009] The control mechanism includes a hollow tube and a fixed block. Two fixed blocks are symmetrically installed on both sides of the middle of the hollow cavity. A hollow tube slidably connected to the side wall of the movable mold is arranged between the two fixed blocks. The end of the hollow tube is fixedly connected to a connecting tube that penetrates into the movable mold, and the end of the connecting tube is fixedly connected to the side wall of the movable plate.

[0010] Preferably, a screw injection machine is fixedly installed on the top of the other side of the workbench, the injection port of the screw injection machine penetrates into the fixed mold, a feed port is installed above the screw injection machine through a mounting frame, and a control panel is installed on the workbench on one side of the screw injection machine.

[0011] Preferably, fixed arms are provided on both sides of the fixed seat, a sliding seat is slidably connected between the opposite surfaces of the two fixed arms, an electric telescopic rod is fixedly installed on one side of the fixed seat, the telescopic end of the electric telescopic rod is inserted into the fixed seat, and the end of the telescopic end of the electric telescopic rod is fixedly connected to the side wall of the sliding seat.

[0012] Preferably, two groups of third connecting rods which are symmetrical to each other are rotatably connected at the top and bottom ends of the sliding seat, and the two groups of third connecting rods are rotatably connected to the three groups of first connecting rods respectively.

[0013] Preferably, a hose is fixedly connected to the end of the gas cylinder, the top and bottom of the hollow tube are both hollow structures, and the two hoses are respectively connected to the connecting pipe through the hollow structures of the hollow tube.

[0014] Preferably, a second mold is fixedly mounted on the side wall of the mold back plate, and the end of the demoulding column penetrates into the second mold.

[0015] Preferably, a plurality of air holes are evenly formed on the side wall at the end of the demoulding column, and each air hole is connected to the connecting pipe through a pipe formed inside the demoulding column and the movable plate.

[0016] Preferably, a sliding groove is opened on the side wall of the fixed block close to the hollow tube, a slider is slidably connected in the sliding groove, and two groups of symmetrical movable rods are rotatably connected to the top and bottom of the two sliders, and the ends of the two groups of movable rods are rotatably connected to the ends of the two groups of second connecting rods.

[0017] Preferably, two first limit blocks are symmetrically arranged on one side of the hollow tube close to the connecting tube, the spacing between the first limit block and the connecting tube is the same as the width of the movable cavity, and two second limit blocks are symmetrically arranged at the end of the hollow tube, and the opposite surfaces of the two sliders are fixedly connected with blocks, and the two blocks are respectively located between the first limit block and the second limit block.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a demoulding mechanism and a demoulding component. The demoulding mechanism compresses air through a second connecting rod linked piston and an air cylinder. During demoulding, compressed air is used to purge the molded plastic package to assist in demoulding and cooling. The demoulding component is controlled by a control mechanism. During demoulding operation, six demoulding columns push out the molded plastic package, and the demoulding component cooperates with the demoulding mechanism, so that the demoulding operation of the molded plastic package is more convenient, safe and efficient, and it is prevented that the molded plastic package is damaged by demoulding through external equipment, resulting in damage to the product. The cooling operation can also accelerate the solidification of the molded plastic package to prevent the problem of damage again after falling out of the mold. These actions can be achieved simultaneously by controlling the electric telescopic rod to perform conventional mold closing and mold separation operations without the need to use additional equipment to realize the functions. Energy consumption can be effectively reduced, and additional working time consumed due to equipment maintenance and repair can be reduced, so as to improve the production efficiency of plastic packaging.

[0020] The present invention sets a control mechanism, and the control mechanism is also linked with the second connecting rod. Through the setting of the hollow tube, when the second connecting rod is actuated, the demoulding mechanism and the demoulding assembly can be synchronously actuated, and the demoulding mechanism can be preferentially actuated to perform air compression during the demoulding operation, and then the demoulding assembly can be actuated to perform mold pushing and purging operations. In addition, when the mold is closed, the demoulding mechanism and the demoulding assembly can be synchronously reset without affecting the work of the next cycle. The demoulding mechanism, the demoulding assembly and the control mechanism cooperate with each other and are jointly driven only through the second connecting rod. There is no need to set up additional power equipment, and the demoulding mechanism has the characteristics of high efficiency, energy saving and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of an injection molding device for plastic packaging of food proposed by the present invention;

[0022] Figure 2 This is a schematic diagram of the fixed mold and movable mold structure of an injection molding device for plastic packaging for food proposed by the present invention;

[0023] Figure 3 A side view of a first connecting rod and a second connecting rod of an injection molding device for plastic packaging of food proposed by the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of a sliding seat of an injection molding device for plastic packaging for food proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of a movable mold and a demoulding mechanism of an injection molding device for plastic packaging for food proposed by the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of a demoulding mechanism of an injection molding device for plastic packaging for food proposed by the present invention;

[0027] Figure 7 This is a schematic diagram of the control mechanism structure of an injection molding device for plastic packaging for food proposed by the present invention;

[0028] Figure 8 This is a schematic diagram of the hose mechanism structure of an injection molding device for plastic packaging for food proposed by the present invention;

[0029] Fig. 9 This is a schematic diagram of the connecting pipe structure of an injection molding device for plastic packaging for food proposed by the present invention;

[0030] Fig.10 This is a schematic diagram of the second mold structure of an injection molding device for plastic packaging for food proposed by the present invention;

[0031] Fig.11 This is a schematic diagram of the mold back plate structure of an injection molding device for plastic packaging for food proposed by the present invention;

[0032] Fig.12 The present invention is a schematic diagram of the structure of a demoulding component of an injection molding device for plastic packaging of food.

[0033] In the figure: 1. workbench; 2. screw injection machine; 3. fixed mold; 4. first mold; 5. fixed seat; 6. fixed arm; 7. electric telescopic rod; 8. sliding seat; 9. guide rod; 10. movable mold; 11. hollow cavity; 12. hollow mouth; 13. first connecting rod; 14. second connecting rod; 15. third connecting rod; 16. demoulding mechanism; 17. air cylinder; 18. piston; 19. hose; 20. connecting pipe; 21. second mold; 22. mold back plate; 23. movable cavity; 24. demoulding assembly; 25. movable plate; 26. demoulding column; 27. air hole; 28. movable rod; 29. ​​fixed block; 30. slide groove; 31. slider; 32. stopper; 33. control mechanism; 34. hollow tube; 35. first limit block; 36. second limit block. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Reference Figure 1-12, an injection molding device for plastic packaging of food, comprising a workbench 1 and a fixed mold 3, a fixed seat 5 is fixedly installed on the top of one side of the workbench 1, a fixed mold 3 is fixedly installed on the middle of the top of the workbench 1, a first mold 4 is fixedly installed on the side wall of the fixed mold 3, four guide rods 9 are fixedly connected between the fixed mold 3 and the fixed seat 5, a movable mold 10 is slidably connected on the guide rod 9, a mold back plate 22 is fixedly installed on the side wall of the movable mold 10 close to the fixed mold 3, a movable cavity 23 is opened on one side of the mold back plate 22, a demoulding component 24 is arranged in the movable cavity 23, a hollow cavity 11 is opened on the side of the movable mold 10 close to the fixed seat 5, a control mechanism 33 is arranged in the hollow cavity 11, three groups of first connecting rods 13 are rotatably connected to the top and bottom of the fixed seat 5, two groups of second connecting rods 14 are rotatably connected to the top and bottom of the movable mold 10, each group of first connecting rods 13 is rotatably connected to the end of the second connecting rod 14, and a demoulding mechanism 16 is arranged between the two groups of second connecting rods 14;

[0036] The demoulding mechanism 16 includes a gas cylinder 17 and a piston 18. Two mutually symmetrical pistons 18 are rotatably connected between the two sets of second connecting rods 14. A hollow opening 12 is provided on the side wall of the hollow cavity 11. Two gas cylinders 17 are rotatably connected in the middle of the hollow opening 12. The ends of the two pistons 18 are respectively slidably connected in the two gas cylinders 17.

[0037] The demoulding assembly 24 includes a movable plate 25 and demoulding columns 26. The movable plate 25 is slidably connected to the side wall of the movable cavity 23, and six demoulding columns 26 are fixedly connected to the side wall of the movable plate 25.

[0038] The control mechanism 33 includes a hollow tube 34 and a fixed block 29. Two fixed blocks 29 are symmetrically installed on both sides of the middle of the hollow cavity 11. A hollow tube 34 slidably connected to the side wall of the movable mold 10 is arranged between the two fixed blocks 29. The end of the hollow tube 34 is fixedly connected to the connecting tube 20 that penetrates into the movable mold 10, and the end of the connecting tube 20 is fixedly connected to the side wall of the movable plate 25. The fixed seat 5 and the fixed mold 3 are fixed in position, and the movable mold 10 is guided to move by the guide rod 9. The arrangement of the mold back plate 22 and the movable cavity 23 is mainly to facilitate the installation of the demoulding component 24 and the movement of the movable plate 25. The spacing between the first limit block 35 and the connecting pipe 20 is the same as the width of the movable cavity 23, so that the movable plate 25 and the hollow tube 34 are at a certain distance consistent during mold separation without interfering with each other, thereby preventing interference between the various parts from affecting demoulding. The demoulding mechanism 16 compresses air through the second connecting rod 14, and uses compressed air to purge the molded plastic packaging during demoulding to assist demoulding and auxiliary cooling. The demoulding component 24 is controlled by the control mechanism 33, and the molded plastic packaging is ejected by the action of the six demoulding columns 26 during the demoulding operation. The control mechanism 33 cooperates with the demoulding mechanism 16 to make the demoulding operation of the molded plastic packaging more convenient, safe and efficient. The control mechanism 33 is also linked with the second connecting rod 14. Through the setting of the hollow tube 34, when the second connecting rod 14 is actuated, the demoulding mechanism 16 and the demoulding assembly 24 can be synchronously actuated, and the demoulding mechanism 16 can be activated first to perform air compression during the demoulding operation, and then the demoulding assembly 24 can be activated to perform mold pushing and purging operations. When the mold is closed, the demoulding mechanism 16 and the demoulding assembly 24 can be reset synchronously without affecting the work of the next cycle. The demoulding mechanism 16, the demoulding assembly 24 and the control mechanism 33 cooperate with each other and are jointly driven only through the second connecting rod 14. There is no need to set up additional power equipment, and it has the characteristics of high efficiency, energy saving and safety.

[0039] As a technical optimization solution of the present invention, a screw injection machine 2 is fixedly installed on the top of the other side of the workbench 1, the injection port of the screw injection machine 2 penetrates the fixed mold 3, a feed port is installed above the screw injection machine 2 through a mounting frame, and a control panel is installed on the workbench 1 on one side of the screw injection machine 2. The screw injection machine 2 is a common device used in injection molding machines, which uses high temperature heating to heat and melt plastic granular raw materials, and squeezes the molten raw materials into the mold through the injection port through the screw, and the control panel is used to control the start and stop of the equipment and the adjustment of operating parameters.

[0040] As a technical optimization solution of the present invention, fixed arms 6 are provided on both sides of the fixed seat 5, and a sliding seat 8 is slidably connected between the opposite surfaces of the two fixed arms 6. An electric telescopic rod 7 is fixedly installed on one side of the fixed seat 5, and the telescopic end of the electric telescopic rod 7 is inserted into the fixed seat 5, and the end of the telescopic end of the electric telescopic rod 7 is fixedly connected to the side wall of the sliding seat 8. The sliding seat 8 moves along the fixed arm 6 through the extension and contraction of the electric telescopic rod 7. When the electric telescopic rod 7 is extended, the sliding seat 8 pushes the movable mold 10 to move toward the fixed mold 3 to achieve mold closing. When the electric telescopic rod 7 is retracted, the sliding seat 8 takes the movable mold 10 away from the fixed mold 3 to achieve mold separation.

[0041] As a technical optimization solution of the present invention, two groups of symmetrical third connecting rods 15 are rotatably connected at the top and bottom of the sliding seat 8, and the two groups of third connecting rods 15 are rotatably connected to the three groups of first connecting rods 13 respectively. Since the third connecting rod 15 is rotatably connected to the first connecting rod 13, and the first connecting rod 13 is rotatably connected to the second connecting rod 14, when the mold closing operation is performed, the sliding seat 8 and the third connecting rod 15 push the three groups of first connecting rods 13 and the two groups of second connecting rods 14 to expand each other. At this time, the two groups of second connecting rods 14 that are expanded to each other can pull the two groups of pistons 18 away from each other and move from the bottom to the top of the air cylinder 17. Similarly, the two groups of movable rods 28 are also in an expanding action, which can pull the slider 31 to slide along the slide groove 30 toward the fixed seat 5. When the mold separation operation is performed, the sliding seat 8 and the third connecting rod 15 pull the three groups of first connecting rods 13 and the two groups of second connecting rods 14 to expand each other. The first connecting rod 13 and the two groups of second connecting rods 14 are in a closing action with each other. At this time, the two groups of second connecting rods 14 that are closed with each other can push the two groups of pistons 18 to approach each other and move from the top to the bottom of the air cylinder 17. Similarly, the two groups of movable rods 28 are also in a closing action, which can push the slider 31 to slide along the slide groove 30 toward the fixed mold 3. These actions can be realized synchronously by controlling the electric telescopic rod 7 to perform conventional mold closing and mold separation operations without the need to use additional equipment to realize the function. This can effectively reduce energy consumption, reduce the extra working time consumed due to equipment maintenance and overhaul, and improve the production efficiency of plastic packaging.

[0042] As a technical optimization solution of the present invention, a hose 19 is fixedly connected to the end of the air cylinder 17, and the top and bottom of the hollow tube 34 are both hollow structures. The two hoses 19 are respectively connected to the connecting tube 20 through the hollow structures of the hollow tube 34. During the mold separation operation, the piston 18 is pushed into the air cylinder 17, and the air is compressed into the connecting tube 20 through the hose 19 to blow and cool the molded plastic packaging. The hollow structure of the hollow tube 34 facilitates the arrangement of the hose 19, so that when the air cylinder 17 is in motion, the hose 19 can move freely without being restricted by the hollow tube 34.

[0043] As a technical optimization solution of the present invention, the side wall of the mold back plate 22 is fixedly mounted with the second mold 21, and the end of the demoulding column 26 is inserted into the second mold 21. When the first mold 4 and the second mold 21 are molded together, the two groups of movable rods 28 pull the slider 31 to slide along the slide groove 30 toward the fixed seat 5. At this time, the end of the demoulding column 26 is flush with the bottom end of the second mold 21, so that the end of the demoulding column 26 and the second mold 21 form a whole to facilitate injection molding. When the mold is separated, the two groups of movable rods 28 push the slider 31 to slide along the slide groove 30 toward the fixed mold 3, so that the mold end of the demoulding column 26 extends out of the bottom end of the second mold 21, which can push the molded plastic package to be demoulded, and at the same time, the air hole 27 can be exposed from the second mold 21, so that the compressed air stored in the connecting pipe 20 can be released to purge and cool the molded plastic package and assist demoulding.

[0044] As a technical optimization solution of the present invention, a plurality of air holes 27 are evenly opened on the side wall of the end of the demoulding column 26, and each air hole 27 is connected to the connecting pipe 20 through the pipeline opened inside the demoulding column 26 and the movable plate 25. When the mold is separated, the compressed air injected into the connecting pipe 20 by the air cylinder 17 is finally blown out from the air hole 27 through the pipeline opened inside the movable plate 25 and the demoulding column 26.

[0045] As a technical optimization solution of the present invention, a sliding groove 30 is provided on the side wall of the fixed block 29 close to the hollow tube 34, and a slider 31 is slidably connected in the sliding groove 30. The top and bottom of the two sliders 31 are respectively rotatably connected with two groups of mutually symmetrical movable rods 28, and the ends of the two groups of movable rods 28 are respectively rotatably connected with the ends of the two groups of second connecting rods 14. The movable rod 28 and the second connecting rod 14 are rotatably connected by the rotating shaft at the end of the second connecting rod 14 in a slotted sleeve manner, that is, the second connecting rod 14 and the slider 31 are connected by the movable rod 28, so that the control mechanism 33 can be linked and controlled by the movable rod 28.

[0046] As a technical optimization solution of the present invention, two first limit blocks 35 are symmetrically arranged on one side of the hollow tube 34 close to the connecting tube 20, and the spacing between the first limit block 35 and the connecting tube 20 is the same as the width of the active cavity 23. Two second limit blocks 36 are symmetrically arranged at the end of the hollow tube 34, and the opposite surfaces of the two sliders 31 are fixedly connected with blocks 32, and the two blocks 32 are respectively located between the first limit blocks 35 and the second limit blocks 36. The hollow tube 34 and the first limit block 35 and the second limit block 36 are arranged such that there is a gap between the first limit block 35 and the second limit block 36. During the mold closing operation, the movable rod 28 pulls the slider 31 and the stop block 32 to slide toward the fixed seat 5. The stop block 32 abuts against the second limit block 36 and pulls the hollow tube 34, the connecting tube 20, the movable plate 25 and the demoulding column 26 to slide synchronously toward the fixed seat 5. As mentioned above, the end of the demoulding column 26 is finally flush with the bottom end of the second mold 21 to facilitate injection molding. During the mold separation operation, the movable rod 28 pushes the slider 31 and the stop block 32 to slide toward the fixed mold 3. During the sliding process, the stop block 32 must first slide through the space between the first limit block 35 and the second limit block 36 before it can abut against the first limit block 35. During this period, the piston 18 has pushed the air cylinder 17 The air is compressed and injected into the connecting tube 20. At this time, the demoulding column 26 is still not in motion, and the compressed air accumulates in the connecting tube 20. After the stopper 32 abuts against the first limit block 35, the slider 31 continues to slide, and the stopper 32 can push the first limit block 35 to drive the hollow tube 34, the connecting tube 20, the movable plate 25 and the demoulding column 26 to slide synchronously toward the fixed mold 3, so that the end of the demoulding column 26 extends out of the second mold 21 and can push the molded plastic package to demould. At the same time, the air hole 27 is exposed, and the compressed air in the connecting tube 20 is released. The demoulding can be assisted and the temperature can be purged and cooled in a softer way by blowing air, so as to prevent the molded plastic package from being damaged by demoulding through external equipment and causing damage to the product. In addition, the cooling operation can also accelerate the solidification of the molded plastic package to prevent it from being damaged again after falling out of the mold.

[0047] When the present invention is in use, the operator puts the plastic granule raw material, starts the screw injection machine 2 and the electric telescopic rod 7 on the control panel, enters the automatic cycle working state, heats the plastic granule raw material to melt it at high temperature, and squeezes the molten raw material into the mold through the injection port through the screw. When the mold is closed, the electric telescopic rod 7 extends to push the sliding seat 8 to move along the fixed arm 6, and the sliding seat 8 and the third connecting rod 15 push the three groups of first connecting rods 13 and the two groups of second connecting rods 14 to expand each other. At this time, the two groups of second connecting rods 14 that are expanded to each other can pull the two groups of pistons 18 away from each other and move from the bottom of the air cylinder 17 to the top to inhale air. Similarly, the two groups of moving The rod 28 also unfolds. During the process of the movable rod 28 pulling the slider 31 and the stopper 32 to slide toward the fixed seat 5, the stopper 32 abuts against the second limit block 36 and pulls the hollow tube 34, the connecting tube 20, the movable plate 25 and the demoulding column 26 to slide synchronously toward the fixed seat 5, and finally makes the end of the demoulding column 26 flush with the bottom end of the second mold 21, so that the end of the demoulding column 26 and the second mold 21 form a whole to facilitate injection molding. At this time, the screw injection machine 2 injects the molten raw material into the mold for molding. When the mold separation operation is performed after molding, the electric telescopic rod 7 contracts and pulls the sliding seat 8. The sliding seat 8 and the third connecting rod 15 pull the three groups of first connecting rods 13 and the two groups of third connecting rods 13. The two connecting rods 14 are in a closing action with each other. At this time, the two groups of second connecting rods 14 that are closed with each other can push the two groups of pistons 18 to approach each other and move from the top to the bottom of the air cylinder 17. The piston 18 is pushed into the air cylinder 17 and compresses the air into the connecting pipe 20 through the hose 19. Similarly, the two groups of movable rods 28 are also in a closing action. The movable rod 28 pushes the slider 31 and the stopper 32 to slide toward the fixed mold 3. During the sliding process, the stopper 32 must first slide through the space between the first limit block 35 and the second limit block 36 before it can abut against the first limit block 35. During this period, the piston 18 has pushed the air cylinder 17 to compress the air and inject it into the connecting pipe 20. At this time, demoulding is performed. The column 26 has not yet moved, and the compressed air accumulates in the connecting pipe 20. When the block 32 abuts against the first limit block 35, the slider 31 continues to slide, and the block 32 can push the first limit block 35 to drive the hollow tube 34, the connecting pipe 20, the movable plate 25 and the demoulding column 26 to slide synchronously toward the fixed mold 3, so that the end of the demoulding column 26 extends out of the second mold 21 and can push the molded plastic package to demould. At the same time, the air hole 27 is exposed, and the compressed air in the connecting pipe 20 is released to blow and cool the molded plastic package and assist in demoulding. The molded plastic package can fall off and be collected in the collecting bucket under the workbench 1. This cycle realizes the integrated operation of injection molding and demoulding.

[0048] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0049] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An injection molding device for plastic packaging of food, comprising a workbench (1) and a fixed mold (3), characterized in that: A fixed seat (5) is fixedly installed at the top of one side of the workbench (1), a fixed mold (3) is fixedly installed in the middle of the top of the workbench (1), a first mold (4) is fixedly installed on the side wall of the fixed mold (3), four guide rods (9) are fixedly connected between the fixed mold (3) and the fixed seat (5), a movable mold (10) is slidably connected to the guide rods (9), a mold back plate (22) is fixedly installed on the side wall of the movable mold (10) close to the fixed mold (3), a movable cavity (23) is opened on one side of the mold back plate (22), and the movable cavity (23) is provided with a demoulding assembly (24), a hollow cavity (11) is provided on one side of the movable mold (10) close to the fixed seat (5), a control mechanism (33) is provided in the hollow cavity (11), three groups of first connecting rods (13) are rotatably connected at the top and bottom of the fixed seat (5), two groups of second connecting rods (14) are rotatably connected at the top and bottom of the movable mold (10), each group of first connecting rods (13) is rotatably connected to the end of the second connecting rod (14), and a demoulding mechanism (16) is provided between the two groups of second connecting rods (14); The demoulding mechanism (16) comprises an air cylinder (17) and a piston (18), two sets of second connecting rods (14) are rotatably connected to two mutually symmetrical pistons (18), a hollow opening (12) is provided on the side wall of the hollow cavity (11), two air cylinders (17) are rotatably connected in the middle of the hollow opening (12), and the ends of the two pistons (18) are respectively slidably connected in the two air cylinders (17); The demoulding assembly (24) comprises a movable plate (25) and demoulding columns (26); the movable plate (25) is slidably connected to the side wall of the movable cavity (23); and six demoulding columns (26) are fixedly connected to the side wall of the movable plate (25); The control mechanism (33) comprises a hollow tube (34) and a fixed block (29). Two fixed blocks (29) are symmetrically installed on both sides of the middle of the hollow cavity (11). A hollow tube (34) slidably connected to the side wall of the movable mold (10) is arranged between the two fixed blocks (29). The end of the hollow tube (34) is fixedly connected to a connecting tube (20) that penetrates into the movable mold (10). The end of the connecting tube (20) is fixedly connected to the side wall of the movable plate (25).

2. The injection molding device for plastic packaging of food according to claim 1, characterized in that: A screw injection machine (2) is fixedly mounted on the top of the other side of the workbench (1); an injection port of the screw injection machine (2) penetrates into the fixed mold (3); a feed port is mounted above the screw injection machine (2) via a mounting frame; and a control panel is mounted on the workbench (1) on one side of the screw injection machine (2).

3. The injection molding device for plastic packaging of food according to claim 1, characterized in that: Fixed arms (6) are arranged on both sides of the fixed seat (5), and a sliding seat (8) is slidably connected between the opposite surfaces of the two fixed arms (6). An electric telescopic rod (7) is fixedly installed on one side of the fixed seat (5), and the telescopic end of the electric telescopic rod (7) is inserted into the fixed seat (5), and the end of the telescopic end of the electric telescopic rod (7) is fixedly connected to the side wall of the sliding seat (8).

4. The injection molding device for plastic packaging of food according to claim 3, characterized in that: The top and bottom ends of the sliding seat (8) are rotatably connected to two groups of mutually symmetrical third connecting rods (15), and the two groups of third connecting rods (15) are rotatably connected to the three groups of first connecting rods (13) respectively.

5. The injection molding device for plastic packaging of food according to claim 1, characterized in that: The end of the air cylinder (17) is fixedly connected with a hose (19), the top and bottom of the hollow tube (34) are both hollow structures, and the two hoses (19) are respectively connected to the connecting tube (20) through the hollow structures of the hollow tube (34).

6. The injection molding device for plastic packaging of food according to claim 1, characterized in that: The second mold (21) is fixedly mounted on the side wall of the mold back plate (22), and the end of the demoulding column (26) penetrates into the second mold (21).

7. The injection molding device for plastic packaging of food according to claim 1, characterized in that: The side wall at the end of the demoulding column (26) is evenly provided with a plurality of air holes (27), and each air hole (27) is connected to the connecting pipe (20) through a pipeline provided inside the demoulding column (26) and the movable plate (25).

8. The injection molding device for plastic packaging of food according to claim 1, characterized in that: A sliding groove (30) is provided on a side wall of the fixed block (29) close to the hollow tube (34), a sliding block (31) is slidably connected in the sliding groove (30), and two groups of symmetrical movable rods (28) are rotatably connected at the top and bottom of the two sliding blocks (31), and the ends of the two groups of movable rods (28) are rotatably connected to the ends of the two groups of second connecting rods (14) respectively.

9. The injection molding device for plastic packaging of food according to claim 8, characterized in that: Two first limit blocks (35) are symmetrically arranged on one side of the hollow tube (34) close to the connecting tube (20), the spacing between the first limit block (35) and the connecting tube (20) being the same as the width of the active cavity (23), two second limit blocks (36) are symmetrically arranged at the end of the hollow tube (34), and the opposite surfaces of the two sliding blocks (31) are fixedly connected with a stop block (32), and the two stop blocks (32) are respectively located between the first limit block (35) and the second limit block (36).

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