Injection mold and injection molding method for processing plastic products

Abstract

The present invention provides an injection mold for processing plastic products, comprising a workbench, a lower mold assembly is arranged on the top of the workbench, a back plate is fixedly connected to the top of the workbench, a top plate is fixedly connected to the top of the back plate, a plurality of pillars are fixedly connected to the four corners of the bottom of the workbench, an upper mold assembly is arranged on the bottom of the top plate, a bottom groove is arranged on the top of the workbench, and an electromagnet is fixedly arranged inside the bottom groove. By arranging the bottom groove, the electromagnet, the outer ring, the injection molding cover, the bottom ring and the pressure relief valve, during the injection molding process, the upper and lower molds are enclosed in the interior for cooling, and external debris is prevented from entering and contacting the molded plastic products, thereby improving the production quality of the plastic products, and at the same time forming a small cooling space, the plastic products can be completely cooled, the cooling efficiency is improved, and the damage to the operator during demoulding is avoided, thereby improving the safety of production.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to an injection mold and an injection molding method for processing plastic products. Background Art

[0002] Plastic is a high molecular polymer material widely used in daily life and industrial production. It is composed of synthetic resins, fillers, plasticizers, stabilizers, colorants and other additives, and has the characteristics of light weight, good chemical stability and strong impact resistance. There are many types of plastics, including polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polycarbonate (PC), etc. These plastics are used in packaging, construction, automobiles, electronics, medical and other fields according to their chemical composition and performance characteristics. Plastic molding is generally carried out by injection molding, so injection molds are required.

[0003] In existing injection molds, liquid plastic is generally injected into the mold cavity, and demolding is performed when the plastic is cooled and formed. During the cooling and molding process, the mold is generally cooled to speed up the molding of the internal plastic product. During demolding, the molded plastic product is not completely cooled, which can easily cause burns to the operator during demolding. In addition, once the incompletely cooled plastic product comes into contact with external impurities, it is easy to adhere to the plastic device, resulting in a defective product. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides an injection mold and an injection molding method for processing plastic products, which solve the problems of slow and incomplete cooling of the injection mold, which easily causes burns to the operator during demolding, and the direct contact of the incompletely cooled plastic product with the outside world, resulting in defective products.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: an injection mold for processing plastic products, comprising a workbench, a lower mold assembly is arranged on the top of the workbench, a back plate is fixedly connected to the top of the workbench, a top plate is fixedly connected to the top of the back plate, a plurality of pillars are fixedly connected to the four corners of the bottom of the workbench, an upper mold assembly is arranged at the bottom of the top plate, a bottom groove is arranged on the top of the workbench, and an electromagnet is fixedly arranged inside the bottom groove.

[0008] Preferably, the lower mold assembly includes a lower mold, an injection groove, air holes and an internal air channel. The bottom of the lower mold is fixedly connected to the workbench, the top of the lower mold is provided with an injection groove, the side walls of the lower mold are provided with air holes, and the interior of the lower mold is provided with an internal air channel.

[0009] Preferably, the upper mold assembly comprises an upper mold, an injection hole, an outer ring, an injection cover, a bottom ring, an electric hydraulic rod, an injection tube, an injection barrel, an air pipe, an air cooler, a connecting pipe, a refrigerator and a pressure relief valve. The upper mold is provided with injection holes running through the upper and lower parts thereof. The outer side wall of the upper mold is fixedly connected with the outer ring, the bottom of the outer ring is fixedly connected with the injection cover, the injection cover is a foldable cover, the bottom of the injection cover is fixedly connected with the bottom ring, the bottom ring is made of metal iron, the top of the outer ring is fixedly connected with the electric hydraulic rod, the top of the upper mold is fixedly connected with the injection tube, the top of the injection tube is fixedly connected with the injection barrel, the top of the outer ring is fixedly connected with the air pipe and the pressure relief valve, the air pipe and the pressure relief valve are symmetrically distributed on the left and right sides of the outer ring, the top of the air pipe is fixedly connected with the air cooler, the right side wall of the air cooler is fixedly connected with the connecting pipe, and the right side of the connecting pipe is fixedly connected with the refrigerator.

[0010] Preferably, the bottom groove is located outside the lower mold, and the number of the electromagnets is multiple and evenly distributed inside the bottom groove. When the electromagnets are activated, the bottom ring can be adsorbed in the bottom groove.

[0011] Preferably, the number of the air holes is multiple and evenly distributed on the side walls around the lower mold, the number of the internal air channels is multiple and evenly distributed inside the lower mold, and the air holes and the internal air channels are interconnected, so as to facilitate cooling into the lower mold and accelerate the cooling and molding of the injection molded plastic.

[0012] Preferably, the injection molded cover is located above the bottom groove.

[0013] Preferably, the number of the electric hydraulic rods is multiple and evenly distributed above the outer ring, and the top of the electric hydraulic rod is fixedly connected to the top plate.

[0014] Preferably, the bottoms of the injection molding barrel, the cold air box and the refrigerator are all fixedly connected to the top plate, the air pipe and the injection molding pipe are both foldable hoses and pass through the top plate, and a valve is provided on the air pipe.

[0015] An injection molding method for an injection mold for processing plastic products, comprising the following specific injection molding steps:

[0016] S1. Spray the release agent in the lower mold, then start the electric hydraulic rod to move the upper mold and the outer ring downward, close the upper mold with the lower mold, clamp the bottom ring in the bottom groove, and then start the electromagnet to firmly fix the bottom ring in the bottom groove, while sealing the upper mold and the lower mold inside;

[0017] S2, start the injection barrel, and the liquid plastic inside enters the mold cavity between the upper mold and the lower mold from the injection tube and the injection hole for injection molding;

[0018] S3, start the refrigerator, the generated cold air enters the cold air box, then open the valve on the air pipe to let the cold air enter the injection molding cover, so that the internal temperature of the injection molding cover drops, and at the same time, the cold air can also quickly cool the lower mold through the air holes and internal air channels on the lower mold, thereby accelerating the molding of the injection mold. When the internal air pressure of the injection molding cover is too high, the pressure relief valve discharges part of the gas to relieve the pressure;

[0019] S4, then start the electric hydraulic rod to move the upper mold upward, so that the upper mold and the lower mold are separated, and the cold air injected from the air pipe cools the molded plastic again, so that the plastic device is completely cooled;

[0020] S5, then disconnect the electromagnet, continue to start the electric hydraulic rod to separate the injection molding cover from the electromagnet, and finally demould to take out the molded plastic product.

[0021] (III) Beneficial effects

[0022] The present invention provides an injection mold and an injection molding method for processing plastic products. The following beneficial effects are achieved:

[0023] 1. By setting up the air pipe, cold air box, connecting pipe and refrigerator, the refrigerator can operate continuously for a long time to generate cold air and store it in the cold air box for standby use. When in use, just open the air pipe.

[0024] 2. By setting the bottom groove, electromagnet, outer ring, injection cover, bottom ring and pressure relief valve, the upper and lower molds are closed inside for cooling during the injection molding process, preventing external debris from entering and contacting the molded plastic products, thereby improving the production quality of plastic products. At the same time, a small cooling space is formed to completely cool the plastic products, improve the cooling efficiency, avoid harm to the operator during demoulding, and improve production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front view of an injection mold for processing plastic products proposed by the present invention;

[0026] Figure 2 This is a structural diagram of an injection mold for plastic product processing proposed by the present invention when the injection cover is opened;

[0027] Figure 3 This is a cross-sectional view of an injection cover of an injection mold for processing plastic products proposed by the present invention;

[0028] Figure 4 A cross-sectional view of a workbench of an injection mold for processing plastic products proposed by the present invention;

[0029] Figure 5 This is a structural diagram of a lower mold of an injection mold for processing plastic products proposed by the present invention;

[0030] Figure 6 The present invention is a cross-sectional view of a lower mold of an injection mold for processing plastic products.

[0031] Among them, 1. workbench; 2. lower mold assembly; 3. back plate; 4. top plate; 5. pillar; 6. upper mold assembly; 7. bottom groove; 8. electromagnet; 201. lower mold; 202. injection groove; 203. air hole; 204. inner airway; 601. upper mold; 602. injection hole; 603. outer ring; 604. injection cover; 605. bottom ring; 606. electric hydraulic rod; 607. injection tube; 608. injection barrel; 609. air pipe; 610. cold air box; 611. connecting pipe; 612. refrigerator; 613. pressure relief valve. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1-6 As shown, an embodiment of the present invention provides an injection mold for processing plastic products, including a workbench 1, a lower mold assembly 2 is arranged on the top of the workbench 1, a back plate 3 is fixedly connected to the top of the workbench 1, a top plate 4 is fixedly connected to the top of the back plate 3, a plurality of pillars 5 are fixedly connected to the four corners of the bottom of the workbench 1, an upper mold assembly 6 is arranged at the bottom of the top plate 4, a bottom groove 7 is arranged on the top of the workbench 1, an electromagnet 8 is fixedly arranged inside the bottom groove 7, a plurality of electromagnets 8 are arranged, and are evenly distributed inside the bottom groove 7.

[0034] The lower mold assembly 2 includes a lower mold 201, an injection groove 202, air holes 203 and an internal air channel 204. The bottom of the lower mold 201 is fixedly connected to the workbench 1, and the bottom groove 7 is located on the outside of the lower mold 201. The top of the lower mold 201 is provided with an injection groove 202, and the side walls of the lower mold 201 are provided with air holes 203. The interior of the lower mold 201 is provided with an internal air channel 204. There are multiple air holes 203 and they are evenly distributed on the side walls of the lower mold 201. There are multiple internal air channels 204 and they are evenly distributed inside the lower mold 201 from top to bottom. The air holes 203 and the internal air channels 204 are interconnected for cooling the lower mold 201.

[0035] The upper mold assembly 6 includes an upper mold 601, an injection hole 602, an outer ring 603, an injection cover 604, a bottom ring 605, an electric hydraulic rod 606, an injection tube 607, an injection barrel 608, an air pipe 609, an air cooler 610, a connecting pipe 611, a refrigerator 612 and a pressure relief valve 613. The upper mold 601 is provided with an injection hole 602 running through the upper and lower parts. The outer wall of the upper mold 601 is fixedly connected to the outer ring 603. The bottom of the outer ring 603 is fixedly connected to the injection cover 604. The injection cover 604 is a foldable cover body. The cover 604 is located above the bottom groove 7. The bottom of the injection cover 604 is fixedly connected with a bottom ring 605. The bottom ring 605 is made of metal iron. When the electromagnet 8 is started, the bottom ring 605 can be adsorbed and fixed in the bottom groove 7, so that the upper mold 601 and the lower mold 201 are enclosed inside. The top of the outer ring 603 is fixedly connected with an electric hydraulic rod 606. There are multiple electric hydraulic rods 606, which are evenly distributed above the outer ring 603. The top of the electric hydraulic rod 606 is fixedly connected to the top plate 4. When the electric hydraulic rod 606 is started, the top plate 4 is fixedly connected to the top plate 4. When the rod 606 is released, the upper mold 601 and the injection cover 604 can be pushed downward, the upper mold 601 and the lower mold 201 complete the mold closing, the bottom ring 605 is stuck in the bottom groove 7, the top of the upper mold 601 is fixedly connected with an injection tube 607, the injection tube 607 is connected with the injection hole 602, and the top of the injection tube 607 is fixedly connected with an injection barrel 608. When the injection barrel 608 is started, the liquid plastic in the injection barrel 608 enters the injection hole 602 from the injection tube 607, and then is injected into the mold cavity between the upper mold 601 and the lower mold 201. After the injection molding is completed, the top of the outer ring 603 is fixedly connected with an air pipe 609 and a pressure relief valve 613, and the air pipe 609 and the pressure relief valve 613 are symmetrically distributed on the left and right sides of the outer ring 603. The pressure relief valve 613 can relieve the excessive air pressure inside the injection molding cover 604. The top of the air pipe 609 is fixedly connected with a cold air box 610 for storing the cold air generated by the refrigerator 612 and providing cooling gas for the injection molding cover 604. A connecting pipe 611 is fixedly connected to the right side wall of the cold air box 610, and the right side of the connecting pipe 611 is fixedly connected to the refrigerator 612.

[0036] The bottoms of the injection barrel 608 , the cold air box 610 and the refrigerator 612 are all fixedly connected to the top plate 4 . The air pipe 609 and the injection pipe 607 are both foldable hoses and pass through the top plate 4 . A valve is provided on the air pipe 609 .

[0037] An injection molding method for an injection mold for processing plastic products, comprising the following specific injection molding steps:

[0038] S1. Spray the release agent in the lower mold 201, then start the electric hydraulic rod 606 to move the upper mold 601 and the outer ring 603 downward, the upper mold 601 is molded with the lower mold 201, the bottom ring 605 is clamped in the bottom groove 7, and then start the electromagnet 8 to firmly fix the bottom ring 605 in the bottom groove 7, and at the same time, the upper mold 601 and the lower mold 201 are enclosed inside;

[0039] S2, start the injection barrel 608, and the liquid plastic inside enters the mold cavity between the upper mold 601 and the lower mold 201 from the injection tube 607 and the injection hole 602 for injection molding;

[0040] S3, start the refrigerator 612, the generated cold air enters the cold air box 610, then open the valve on the air pipe 609, let the cold air enter the injection cover 604, so that the internal temperature of the injection cover 604 decreases, and at the same time, the cold air can also pass through the air holes 203 and the internal air channel 204 on the lower mold 201 to quickly and comprehensively cool the lower mold 201, thereby accelerating the molding of the injection mold. When the internal air pressure of the injection cover 604 is too high, the pressure relief valve 613 discharges part of the gas to relieve the pressure;

[0041] S4, then start the electric hydraulic rod 606 to move the upper mold 601 upward, so that the upper mold 601 and the lower mold 201 are separated, and the cold air injected from the air pipe 609 cools the molded plastic again, so that the plastic product is completely cooled;

[0042] S5, then disconnect the electromagnet 8, continue to start the electric hydraulic rod 606, separate the injection molding cover 604 from the electromagnet 8, and finally demould to take out the molded plastic product.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding method for an injection mold for processing plastic products, characterized in that: An injection mold for processing plastic products using an injection molding method comprises a workbench (1), a lower mold assembly (2) is arranged on the top of the workbench (1), a back plate (3) is fixedly connected to the top of the workbench (1), a top plate (4) is fixedly connected to the top of the back plate (3), a plurality of pillars (5) are fixedly connected to the four corners of the bottom of the workbench (1), an upper mold assembly (6) is arranged at the bottom of the top plate (4), a bottom groove (7) is arranged on the top of the workbench (1), and an electromagnet (8) is fixedly arranged inside the bottom groove (7); The lower mold assembly (2) comprises a lower mold (201), an injection groove (202), an air hole (203) and an internal air channel (204); the bottom of the lower mold (201) is fixedly connected to the workbench (1); the top of the lower mold (201) is provided with an injection groove (202); the side walls of the lower mold (201) are provided with air holes (203); and the interior of the lower mold (201) is provided with an internal air channel (204); The upper mold assembly (6) comprises an upper mold (601), an injection hole (602), an outer ring (603), an injection cover (604), a bottom ring (605), an electric hydraulic rod (606), an injection tube (607), an injection barrel (608), an air pipe (609), a cold air box (610), a connecting pipe (611), a refrigerator (612) and a pressure relief valve (613). The upper mold (601) is provided with an injection hole (602) running through the upper and lower parts. The outer side wall of the upper mold (601) is fixedly connected to the outer side wall. The bottom of the outer ring (603) is fixedly connected to the injection cover (604). The injection cover (604) is a foldable cover. The bottom of the injection cover (604) is fixedly connected to the bottom ring (605). ), the bottom ring (605) is made of metal iron, the top of the outer ring (603) is fixedly connected to an electric hydraulic rod (606), the top of the upper mold (601) is fixedly connected to an injection tube (607), the top of the injection tube (607) is fixedly connected to an injection barrel (608), the top of the outer ring (603) is fixedly connected to an air pipe (609) and a pressure relief valve (613), the air pipe (609) and the pressure relief valve (613) are symmetrically distributed on the left and right sides of the outer ring (603), the top of the air pipe (609) is fixedly connected to a cold air box (610), the right side wall of the cold air box (610) is fixedly connected to a connecting pipe (611), and the right side of the connecting pipe (611) is fixedly connected to a refrigerator (612); The injection molding method comprises the following specific injection molding steps: S1. Spray a mold release agent in the lower mold (201), then start the electric hydraulic rod (606) to move the upper mold (601) and the outer ring (603) downward, close the upper mold (601) and the lower mold (201), and snap the bottom ring (605) into the bottom groove (7), then start the electromagnet (8) to firmly fix the bottom ring (605) in the bottom groove (7), and at the same time seal the upper mold (601) and the lower mold (201) inside; S2, starting the injection molding barrel (608), and the liquid plastic inside enters the mold cavity between the upper mold (601) and the lower mold (201) through the injection molding tube (607) and the injection molding hole (602) for injection molding; S3, starting the refrigerator (612), and the generated cold air enters the cold air box (610), then opening the valve on the air pipe (609) to allow the cold air to enter the injection cover (604), so that the internal temperature of the injection cover (604) decreases. At the same time, the cold air can also pass through the air holes (203) and the internal air channel (204) on the lower mold (201) to quickly and comprehensively cool the lower mold (201), thereby accelerating the molding of the injection mold. When the internal air pressure of the injection cover (604) is too high, the pressure relief valve (613) discharges part of the gas to relieve the pressure; S4, then starting the electric hydraulic rod (606) to move the upper mold (601) upward, thereby separating the upper mold (601) and the lower mold (201), and the cold air injected from the air pipe (609) cools the molded plastic again, thereby completely cooling the plastic product; S5, then disconnect the electromagnet (8), continue to start the electric hydraulic rod (606), so that the injection molding cover (604) and the electromagnet (8) are separated, and finally the molded plastic product is removed by demoulding.

2. The method for injection molding of an injection mold for processing plastic products according to claim 1, characterized in that: The bottom groove (7) is located outside the lower mold (201), and the electromagnets (8) are provided in a plurality and are evenly distributed inside the bottom groove (7).

3. The method for injection molding of an injection mold for processing plastic products according to claim 1, characterized in that: The air holes (203) are provided in a plurality and are evenly distributed on the side walls around the lower mold (201); the internal air channels (204) are provided in a plurality and are evenly distributed up and down inside the lower mold (201); the air holes (203) and the internal air channels (204) are interconnected.

4. The method for injection molding of an injection mold for processing plastic products according to claim 1, characterized in that: The injection-molded cover (604) is located above the bottom groove (7).

5. The method for injection molding of an injection mold for processing plastic products according to claim 1, characterized in that: The number of the electric hydraulic rods (606) is multiple and evenly distributed above the outer ring (603), and the top of the electric hydraulic rod (606) is fixedly connected to the top plate (4).

6. The method for injection molding of an injection mold for processing plastic products according to claim 1, characterized in that: The bottoms of the injection molding barrel (608), the cold air box (610) and the refrigerator (612) are all fixedly connected to the top plate (4); the air pipe (609) and the injection molding pipe (607) are both foldable hoses and pass through the top plate (4); and a valve is provided on the air pipe (609).

Images