CN118544539A - Plastic injection molding equipment and method - Google Patents

Abstract

The invention discloses plastic injection molding equipment and a plastic injection molding method, and belongs to the field of injection molding. The plastic injection molding equipment comprises a support frame, a fixed mould and a movable mould, wherein the fixed mould is fixedly connected to one end of the support frame, the movable mould is slidably connected to the support frame, a control cavity and a concave hole are formed in the fixed mould, a push plate is slidably connected in the control cavity, and a push rod is fixedly connected to the side wall of the push plate; through the water injection to the control intracavity, not only can carry out preliminary cooling through the mode of heat transfer to the injection molding, simultaneously, the water pressure that produces still can synchronous drive push rod remove, promotes the injection molding and breaks away from the injection molding district of fixed mould automatically, when realizing cooling to the injection molding, has realized automatic unloading again, has avoided the staff to stretch into the material in the mould by hand, and then can avoid the mould to hurt the staff, has also prevented the injection molding scald staff under the high temperature state, reduces the risk of incident emergence.

Description

Plastic injection molding equipment and method

Technical Field

The invention relates to the technical field of injection molding, in particular to plastic injection molding equipment and a plastic injection molding method.

Background

Injection molding is also called injection molding, and is a molding method of injection molding and molding. The injection molding method has the advantages of high production speed, high efficiency and multiple patterns and varieties, and is suitable for the molding processing fields of mass production, products with complex shapes and the like. In the injection molding process, the heated and melted raw materials are injected into a molding cavity by an injection molding machine under high pressure, and the products are obtained after cooling and solidification, so that the plastic injection molding machine is widely used in the production of plastic parts in various industries.

In the prior art, the existing plastic injection molding equipment cannot automatically realize blanking in the injection molding process, workers are required to manually stretch into a mold to take materials, a certain potential safety hazard is caused, and in the blanking process, the plastic injection molding piece cannot be rapidly cooled, and the injection molding piece in a high-temperature state is very easy to scald the workers, so that the safety accident is caused.

Disclosure of Invention

The invention aims to solve the problems that in the prior art, blanking cannot be automatically realized, workers are required to manually stretch into a die to take materials, and a plastic injection molding piece cannot be rapidly cooled in the blanking process.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

The plastic injection molding equipment comprises a support frame, a fixed mould and a movable mould, wherein the fixed mould is fixedly connected to one end of the support frame, the movable mould is slidably connected to the support frame, a control cavity and a concave hole are formed in the fixed mould, a push plate is slidably connected in the control cavity, a push rod is fixedly connected to the side wall of the push plate, the push rod can move out of the fixed mould through the concave hole, and a first spring is sleeved on the push rod; the water tank and the first water pump are also included; the input of first water pump is through first pipeline and water tank intercommunication, the one end that the shrinkage pool was kept away from to the control chamber is linked together with the output of first water pump through the second pipeline.

Preferably, the bottom of the support frame is fixedly connected with a cooling box, and the cooling box is positioned below one side of the fixed mould close to the movable mould; a screen plate is arranged in the cooling box; the side wall of the cooling box is provided with a water spraying plate, and the control cavity is communicated with the water spraying plate through a third pipeline; the third pipeline and the second pipeline are respectively positioned at two sides of the push plate.

Preferably, the screen plate is rotatably connected to the inner wall of the cooling box; the side wall of the movable mould is fixedly connected with a pulling plate, the pulling plate is connected with the bottom of the screen plate through a pull rope, and a second spring is connected between the bottom of the screen plate and the inner wall of the cooling box; a guide shaft is arranged in the cooling box, and the pull rope is attached to the guide shaft; and a discharge hole is formed in the side wall of the cooling box.

Preferably, the side wall of the cooling box is fixedly connected with a material conveying plate, and the material conveying plate is positioned below the discharge hole.

Preferably, a gap is reserved in the concave hole at the front end of the push rod.

Preferably, the cooling device further comprises a second water pump, wherein the input end of the second water pump is communicated with the cooling box through a fourth pipeline, and the output end of the second water pump is communicated with the water tank through a fifth pipeline.

Preferably, an air pump is fixedly installed on the movable die, an air injection disc is arranged on the side wall of the movable die, and the output end of the air pump is communicated with the air injection disc through a sixth pipeline.

Preferably, the support frame is rotatably connected with a threaded rod, and the movable die is in threaded connection with the threaded rod; one side of the supporting frame is fixedly provided with a motor, and the output end of the motor is fixedly connected with the threaded rod.

Preferably, the fixed moulds are designed into two groups, and the two groups of fixed moulds are respectively and fixedly connected with two ends of the supporting frame; the moving die slides between two fixed die sets.

A plastic injection molding method comprises the following operation steps:

Step one: the movable mould and the fixed mould are matched for injection molding;

step two: after injection molding is completed, a first water pump is started, water is injected into the control cavity, and the injection molding piece is cooled through heat transfer;

Step three: meanwhile, pushing the push plate to move, and discharging the injection molding piece through the push rod;

step four: the injection molding falls into the cooling box, and at the same time, water in the control cavity is sprayed out from the water spraying plate through the third pipeline, and the injection molding is cooled continuously.

Compared with the prior art, the invention provides plastic injection molding equipment, which has the following beneficial effects:

1. This plastics injection moulding equipment through the water injection to the control intracavity, not only can carry out preliminary cooling to the injection molding through the mode of heat transfer, and simultaneously, the hydraulic pressure that produces still can drive the push rod in step and remove, promotes the injection molding and breaks away from the injection molding district of fixed mould automatically, when realizing cooling to the injection molding, has realized automatic unloading again, has avoided the staff to stretch into the manual material of getting in the mould, and then can avoid the mould to hurt the staff, has also prevented the injection molding scald staff under the high temperature state, reduces the risk of incident emergence.

2. This plastics injection moulding equipment, when first water pump is to the control chamber water injection, promotes the push pedal and removes, after the push rod removed the shrinkage pool, under the effect of water pressure, the push pedal continues to remove, after the push pedal passes through the third pipeline, in the rivers got into the third pipeline, then spout through the water spray board, and rivers spout to the injection molding that falls on the otter board, realize the purpose of cooling once more.

3. When the movable die moves far away from the fixed die, the pull rope is tightly pulled after a certain distance is moved, then the screen plate is pulled to rotate downwards, one side of the screen plate is enabled to rotate below the discharge hole, the screen plate becomes inclined, then the injection molding piece slides downwards and slides out through the discharge hole, and the purpose of automatic discharging is achieved.

4. This plastics injection moulding equipment, the water in the cooler bin, after cooling down for the injection molding, its own also has certain temperature, after the backward flow in the water tank, also can promote the temperature in the water tank, avoid the temperature too low, too big with the injection molding difference in temperature leads to injection molding surface temperature suddenly to descend and crack, promotes the yields.

5. According to the plastic injection molding equipment, through the design of the two groups of fixed molds, the injection molding efficiency is improved, when the movable mold and one group of fixed molds are clamped and injection molded, the movable mold moves, blanking is carried out, and meanwhile the movable mold synchronously moves to the other group of fixed molds to carry out clamping and injection molding.

6. This plastics injection moulding equipment, the both sides lateral wall of movable mould all is equipped with jet-propelled dish, when starting the air pump, one side and injection molding interact blows out the injection molding, and the opposite side blows in step, blows out the injection molding material of adhesion on jet-propelled dish.

Drawings

FIG. 1 is a schematic view of a plastic injection molding apparatus according to the present invention;

FIG. 2 is a schematic diagram of a plastic injection molding apparatus according to the present invention;

FIG. 3 is a schematic diagram of a plastic injection molding apparatus according to the present invention;

Fig. 4 is a schematic structural diagram of a plastic injection molding apparatus according to the present invention;

FIG. 5 is a side view of a pull cord of a plastic injection molding apparatus according to the present invention;

FIG. 6 is a schematic diagram of a cooling box of a plastic injection molding apparatus according to the present invention;

FIG. 7 is a schematic diagram II of a cooling box of a plastic injection molding device according to the present invention;

FIG. 8 is a side view of a cooling box of a plastic injection molding apparatus according to the present invention;

FIG. 9 is a cross-sectional view I of a cooling box of a plastic injection molding apparatus according to the present invention;

FIG. 10 is a second cross-sectional view of a cooling box of a plastic injection molding apparatus according to the present invention;

fig. 11 is a schematic structural view of a control chamber of a plastic injection molding apparatus according to the present invention.

In the figure: 1. a support frame; 101. a fixed mold; 102. moving the mold; 103. a motor; 104. a threaded rod; 105. a first guide bar; 106. injection molding a tube; 2. a water tank; 201. a first water pump; 202. a first pipe; 203. a second pipe; 204. a control chamber; 205. concave holes; 206. a push plate; 207. a push rod; 208. a first spring; 3. a third conduit; 301. a cooling box; 302. a screen plate; 303. a water spraying plate; 4. a second spring; 401. a guide shaft; 402. a pull rope; 403. pulling a plate; 404. a second guide bar; 5. a material conveying plate; 501. a discharge port; 6. a second water pump; 601. a fourth conduit; 602. a fifth pipe; 7. an air pump; 701. a sixth conduit; 702. and a jet disk.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.

In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Example 1:

Referring to fig. 1 to 11, a plastic injection molding apparatus comprises a support frame 1, a fixed mold 101, and a movable mold 102, wherein the fixed mold 101 is fixedly connected to one end of the support frame 1, the movable mold 102 is slidably connected to the support frame 1, an injection pipe 106 is connected to the fixed mold 101 for conveying injection molding materials, and the injection molding materials are conveyed through the injection pipe 106 for injection molding when the movable mold 102 and the fixed mold 101 are clamped.

The fixed mould 101 is internally provided with a control cavity 204 and a concave hole 205, a push plate 206 is slidably connected in the control cavity 204, a push rod 207 is fixedly connected to the side wall of the push plate 206, the push rod 207 can move out of the fixed mould 101 through the concave hole 205, a first spring 208 is sleeved on the push rod 207, the first spring 208 is positioned in the control cavity 204, in an initial state, namely, as shown in fig. 11, under the action of no external force, the push rod 207 is contracted into the concave hole 205, and part of the push rod 207 continues to be contracted towards the control cavity 204, a gap is reserved in the concave hole 205 at the front end of the push rod 207, and the front end of the push rod 207 is the end of the push rod 207 far away from the push plate 206.

The plastic injection molding equipment disclosed by the embodiment further comprises a water tank 2 and a first water pump 201, wherein the water tank 2 can be fixedly arranged on the support frame 1 or can be fixed at other places; the first water pump 201 may be fixed to the support frame 1, the water tank 2, or other places.

The input end of the first water pump 201 is communicated with the water tank 2 through a first pipeline 202, and one end of the control cavity 204, which is far away from the concave hole 205, is communicated with the output end of the first water pump 201 through a second pipeline 203.

When the injection molding machine works, the movable die 102 is driven to move and is clamped with the fixed die 101 to perform injection molding, after injection molding is completed, the movable die 102 is driven to be far away from the fixed die 101, then the first water pump 201 is started, the control cavity 204 is filled with water through the second pipeline 203, the water is contacted with the fixed die 101 and is transferred to an injection molding part through heat transfer, and the injection molding part is subjected to preliminary cooling; meanwhile, the water pressure pushes the push plate 206 to move, compresses the first spring 208, and the push rod 207 moves out of the concave hole 205 to push the injection molding piece, so that the injection molding piece is separated from the injection molding area of the fixed mold 101, and the injection molding piece is discharged.

When the water injection to the control chamber 204 through the second pipe 203 is stopped, the push plate 206 and the push rod 207 are returned to the initial positions by the first spring 208.

As shown in fig. 11, in the plastic injection molding apparatus, the push rod 207 is retracted into the concave hole 205 in the initial state, and the concave hole 205 at the front end of the push rod 207 is provided with a gap, so that the injection molding material can be simultaneously stepped into the concave hole 205 during injection molding, and the injection molding material enters the concave hole 205, thereby having the following advantages:

1. During injection molding, injection molding materials enter the concave holes 205, the contact area between the injection molding piece and the fixed mold 101 is increased, and after injection molding is completed, when the movable mold 102 is far away from the fixed mold 101, the friction force between the injection molding piece and the fixed mold 101 is increased, so that the injection molding piece is prevented from being fixed on the movable mold 102;

2. Through the injection molding material entering the concave hole 205, when the push rod 207 pushes the injection molding material to separate from the fixed mold 101, the acting force applied by the push rod 207 is prevented from pushing the injection molding material, the injection molding material is prevented from being damaged, and the protection effect is achieved.

After the blanking is completed, the corners on the injection molding piece, the bulges in the concave holes 205, or pouring marks appearing in other places are polished and ground by an angle grinder or other equipment.

After the injection molding is finished, the injection molding is initially cooled by injecting water into the control cavity 204 in a heat transfer mode, meanwhile, the generated water pressure can synchronously drive the push rod 207 to move so as to push the injection molding to automatically separate from the injection molding area of the fixed mold 101, so that the injection molding is cooled, automatic discharging is realized, workers are prevented from manually stretching into the mold to take materials, the mold is prevented from being injured, the workers are prevented from being scalded by the injection molding in a high-temperature state, and the risk of safety accidents is reduced.

As shown in fig. 1-5, a threaded rod 104 is rotatably connected to the support frame 1, and the movable die 102 is in threaded connection with the threaded rod 104; one side of the support frame 1 is fixedly provided with a motor 103, and the output end of the motor 103 is fixedly connected with a threaded rod 104.

When the movable die 102 needs to be driven to move, the motor 103 is started to drive the threaded rod 104 to rotate, and the movable die 102 is driven to approach or depart from the fixed die 101 through forward rotation and reverse rotation of the threaded rod 104.

The side wall of the fixed mould 101 is fixedly connected with first guide rods 105, the number of the first guide rods 105 is 2-6, and the movable mould 102 is connected on the first guide rods 105 in a sliding manner.

The moving die 102 is slidably connected to the first guide rod 105, so that the moving stability of the moving die 102 is improved.

Example 2:

Referring to fig. 1 to 11, basically the same as embodiment 1, on the basis of embodiment 1, the overall technical scheme is further optimized, and the cooling efficiency and the discharging safety of the injection molding part are improved.

The bottom of the support frame 1 is fixedly connected with a cooling box 301, the cooling box 301 is positioned below one side of the fixed mold 101 close to the movable mold 102, and the top of the cooling box 301 is open; a screen plate 302 is arranged in the cooling box 301; the side wall of the cooling box 301 is provided with a water spraying plate 303, and the control cavity 204 is communicated with the water spraying plate 303 through a third pipeline 3; the third conduit 3 and the second conduit 203 are located on either side of the push plate 206.

The water spraying plate 303 is provided with a water spraying head, and sprays the water to the screen 302.

As shown in fig. 6, after the injection molding is automatically discharged by the push rod 207, the injection molding automatically falls on the screen 302.

And when the first water pump 201 injects water to the control cavity 204 through the second pipeline 203 and pushes the push plate 206 to move, after the push rod 207 moves out of the concave hole 205, the push plate 206 continues to move under the action of water pressure, after the push plate 206 passes over the third pipeline 3, water flows into the third pipeline 3 and then is sprayed out through the water spraying plate 303, and the water flows are sprayed to injection molding pieces falling on the screen 302, so that the purpose of cooling is realized again.

The push plate 206 and the push rod 207 return to the original positions, i.e., to positions between the second conduit 203 and the third conduit 3.

As shown in fig. 6 to 10, the mesh plate 302 is rotatably connected to the inner wall of the cooling tank 301;

The movable die 102 is fixedly connected with a pull plate 403 on the side wall, a second guide rod 404 is fixedly connected to the side wall of the cooling tank 301, the second guide rod 404 can be fixed to the bottom of the supporting frame 1, the pull plate 403 is slidably connected to the second guide rod 404, the pull plate 403 is connected with the bottom of the screen plate 302 through a pull rope 402, the pull rope 402 is a steel wire rope, a second spring 4 is connected between the bottom of the screen plate 302 and the inner wall of the cooling tank 301, and the second springs 4 are in two groups of designs and are respectively located on two sides of the screen plate 302.

As shown in fig. 9, a guide shaft 401 is arranged in the cooling box 301, the guide shaft 401 is designed into two groups, one group is arranged on the inner wall of the bottom of the cooling box 301, and the other group is arranged on the upper side wall of the cooling box 301 and used for changing the direction of a pull rope 402, and the pull rope 402 is attached to the guide shaft 401; a through hole is also provided in the upper side wall of the cooling tank 301, and a pull cord 402 penetrates through the through hole.

In the initial state, the mesh plate 302 is in a horizontal state by the second spring 4.

The cooling tank 301 lateral wall is equipped with discharge gate 501, and discharge gate 501 is located the below when otter board 302 is in the horizontality.

When the movable die 102 moves away from the fixed die 101, after a certain distance, the pull rope 402 is tightly pulled, the screen plate 302 is pulled to rotate downwards, one side of the screen plate 302 is rotated below the discharge hole 501, the screen plate 302 becomes inclined, and then the injection molding piece slides downwards and slides out through the discharge hole 501, so that the purpose of automatic discharging is realized.

When the movable die 102 approaches the fixed die 101, the screen 302 returns to the original state by the second spring 4.

The side wall of the cooling box 301 is fixedly connected with a material conveying plate 5, the material conveying plate 5 is positioned below the material outlet 501, and the material conveying plate 5 is positioned at one end of the cooling box 301 and extends to 3-5 cm inside the cooling box 301.

When the net plate 302 rotates downward, the net plate 302 presses against the feed plate 5, and the injection molding slides onto the feed plate 5 and slides away through the feed plate 5.

As shown in fig. 1, the water tank further comprises a second water pump 6, the second water pump 6 can be mounted on the water tank 2, the support frame 1 or fixedly mounted at other places, the input end of the second water pump 6 is communicated with the cooling tank 301 through a fourth pipeline 601, the fourth pipeline 601 is communicated with the bottom of the cooling tank 301, and the output end of the second water pump 6 is communicated with the water tank 2 through a fifth pipeline 602.

The second water pump 6 is started, and the water in the cooling tank 301 is conveyed back to the water tank 2 through the fourth pipeline 601 and the fifth pipeline 602, so that the recycling is realized.

The water tank 2 is also provided with a filling port for filling water.

The water in the cooling tank 301 also has a certain temperature after cooling the injection molding, and after the water flows back into the water tank 2, the temperature in the water tank 2 can be raised, so that the temperature difference between the water and the injection molding is prevented from being too low, the surface temperature of the injection molding is suddenly reduced and cracked, and the yield is improved.

As shown in fig. 1-6, an air pump 7 is fixedly installed on the movable mold 102, an air injection disk 702 is arranged on the side wall of the movable mold 102, and an output end of the air pump 7 is communicated with the air injection disk 702 through a sixth pipeline 701.

When the movable die 102 moves out of contact with the fixed die 101, the air pump 7 is started to generate air to blow out from the air injection disk 702, and the air flow acts on the injection molding to form a thrust force, so that the injection molding is prevented from adhering to the movable die 102.

As shown in fig. 1-5, the fixed dies 101 are two groups of designs, and the two groups of fixed dies 101 are fixedly connected to two ends of the supporting frame 1 respectively; the moving die 102 slides between the two sets of fixed dies 101.

Through the design of two groups of fixed moulds 101, the injection molding efficiency is improved, when the movable mould 102 and one group of fixed moulds 101 are subjected to mould closing and injection molding, the movable mould 102 moves, blanking is carried out, and meanwhile, the movable mould 102 synchronously moves to the other group of fixed moulds 101 to carry out mould closing and injection molding.

As shown in fig. 5, when the moving die 102 is positioned right in the middle of the two fixed dies 101, the pull ropes 402 on both sides are in a loose state, that is, when the moving die 102 moves from one fixed die 101 to the other fixed die 101, the corresponding pull ropes 402 are tightened only when the moving die moves to the other fixed die 101 quickly, then the corresponding net plate 302 rotates, and when the moving die moves to the other fixed die 101, the corresponding net plate 302 rotates completely to be opened, so that the injection molding slides into the feeding plate 5.

The side walls of the two sides of the movable mold 102 are respectively provided with an air injection disk 702, when the air pump 7 is started, one side interacts with an injection molding piece to blow out the injection molding piece, and the other side synchronously blows out injection molding materials adhered to the air injection disks 702.

Example 3:

referring to fig. 1 to 11, basically the same as embodiment 2, a plastic injection molding method is proposed based on embodiment 2, specifically as follows:

A plastic injection molding method comprises the following operation steps:

Step one: driving the movable die 102 to move, closing the die with the fixed die 101, and then conveying injection molding materials through an injection molding pipe 106 for injection molding;

step two: after injection molding is completed, the first water pump 201 is started, the control cavity 204 is filled with water through the second pipeline 203, and the injection molding piece is cooled through heat transfer;

Step three: meanwhile, the push plate 206 is pushed by the water pressure to move, and the injection molding piece is pushed by the push rod 207, so that automatic blanking of the injection molding piece is realized;

Step four: the injection molding piece falls into the cooling box 301, meanwhile, after the push plate 206 moves across the third pipeline 3, water in the control cavity 204 is sprayed out from the water spraying plate 303 through the third pipeline 3, the injection molding piece is cooled continuously, and then the screen plate 302 is driven to rotate through the pull rope 402, so that the injection molding piece slides away.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art who is skilled in the art to which the present invention pertains should make equivalent substitutions or modifications according to the technical scheme and the inventive concept disclosed herein, and should be covered by the scope of the present invention.

Claims (10)

1. The plastic injection molding equipment comprises a support frame (1), a fixed mold (101) and a movable mold (102), wherein the fixed mold (101) is fixedly connected to one end of the support frame (1), the movable mold (102) is slidably connected to the support frame (1),

A control cavity (204) and a concave hole (205) are arranged in the fixed mould (101), a push plate (206) is connected in the control cavity (204) in a sliding way, a push rod (207) is fixedly connected to the side wall of the push plate (206), the push rod (207) can move out of the fixed mould (101) through the concave hole (205), and a first spring (208) is sleeved on the push rod (207);

the water tank (2) and the first water pump (201) are also included;

The input end of the first water pump (201) is communicated with the water tank (2) through a first pipeline (202), and one end, far away from the concave hole (205), of the control cavity (204) is communicated with the output end of the first water pump (201) through a second pipeline (203).

2. The plastic injection molding equipment according to claim 1, wherein a cooling box (301) is fixedly connected to the bottom of the supporting frame (1), and the cooling box (301) is positioned below one side of the fixed mold (101) close to the movable mold (102);

a screen plate (302) is arranged in the cooling box (301);

the side wall of the cooling box (301) is provided with a water spraying plate (303), and the control cavity (204) is communicated with the water spraying plate (303) through a third pipeline (3);

the third pipeline (3) and the second pipeline (203) are respectively positioned at two sides of the push plate (206).

3. A plastic injection molding apparatus according to claim 2, wherein said mesh plate (302) is rotatably connected to the inner wall of the cooling tank (301);

The side wall of the movable die (102) is fixedly connected with a pulling plate (403), the pulling plate (403) is connected with the bottom of the screen plate (302) through a pull rope (402), and a second spring (4) is connected between the bottom of the screen plate (302) and the inner wall of the cooling box (301);

a guide shaft (401) is arranged in the cooling box (301), and the pull rope (402) is attached to the guide shaft (401);

and a discharge hole (501) is formed in the side wall of the cooling box (301).

4. A plastic injection moulding apparatus according to claim 3, wherein the side wall of the cooling box (301) is fixedly connected with a feeding plate (5), the feeding plate (5) being located below the discharge opening (501).

5. A plastic injection molding apparatus according to claim 1, wherein the recess (205) in the front end of the push rod (207) is left free.

6. A plastic injection moulding apparatus according to claim 2, further comprising a second water pump (6), the input of the second water pump (6) being in communication with the cooling tank (301) via a fourth conduit (601), the output of the second water pump (6) being in communication with the water tank (2) via a fifth conduit (602).

7. The plastic injection molding device according to claim 1, wherein an air pump (7) is fixedly installed on the movable mold (102), an air injection disk (702) is arranged on the side wall of the movable mold (102), and an output end of the air pump (7) is communicated with the air injection disk (702) through a sixth pipeline (701).

8. A plastic injection molding apparatus according to claim 1, wherein a threaded rod (104) is rotatably connected to the support frame (1), and the movable die (102) is screwed to the threaded rod (104);

One side of the supporting frame (1) is fixedly provided with a motor (103), and the output end of the motor (103) is fixedly connected with a threaded rod (104).

9. The plastic injection molding apparatus according to claim 1, wherein the fixed mold (101) is of two sets of designs, the two sets of fixed molds (101) being fixedly connected to both ends of the support frame (1), respectively;

the moving die (102) slides between two fixed die sets (101).

10. A plastic injection molding method using a plastic injection molding apparatus according to any one of claims 1 to 9, characterized by the following steps:

Step one: the movable die (102) and the fixed die (101) are clamped, and injection molding is carried out;

Step two: after injection molding is finished, a first water pump (201) is started, the control cavity (204) is filled with water, and the injection molding piece is cooled through heat transfer;

step three: simultaneously, pushing the push plate (206) to move, and discharging the injection molding piece through the push rod (207);

Step four: the injection molding part falls into the cooling box (301), and at the same time, water in the control cavity (204) is sprayed out of the water spraying plate (303) through the third pipeline (3) to continuously cool the injection molding part.