Plastic parts injection molding equipment and injection molding process

Abstract

The present invention belongs to the technical field of hydraulic equipment, and in particular, relates to a plastic part injection molding equipment, including a workbench, a motor is fixed on the workbench, the driving end of the motor is fixedly connected to a bottom plate, a fixed mold is fixedly arranged on the bottom plate, and the outer wall of the fixed mold is fixedly connected to a fixed plate; a plastic part injection molding process, including the following steps: raw material pumping, cooling water flowing in to cool and shape the plastic part, vibration demolding, and water reflux. In the present invention, the water body automatically flows from a high position to a low position, absorbs the heat in the fixed mold, and makes the plastic part cool and shape quickly, and the cooling process can be accelerated by replacing the heat conductive network. After the plastic part is shaped, the push plate is brought into contact with the knocking rod through the rotation of the bottom plate, so that the knocking rod moves to knock the fixed mold, generating vibration, and accelerating the separation of the plastic part from the inner wall of the fixed mold. At the same time, after the bottom plate is flipped, the cooling water can automatically flow back to the water tank, no longer relying on equipment, and reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the field of injection molding technology, and in particular to a plastic part injection molding device and an injection molding process. Background Art

[0002] Injection molding is a common plastic processing method, which is widely used to produce various plastic parts. It usually includes the steps of injecting molten plastic into the mold cavity, cooling the plastic in the mold, and solidifying and molding.

[0003] During the injection molding process, after the blank is injected into the mold through the injection hole, the blank needs to be cooled in time so that the blank can be cooled and formed in time to obtain the target finished product, and then demolding can be performed. However, during the demolding process, there may be local areas that are not completely cooled and formed, resulting in wall sticking, tearing and deformation. The direct ejection method is likely to cause the molded plastic parts to be pulled and damaged. After searching, Chinese patent CN109986741A discloses a plastic part injection molding device and an injection molding process. The material taking and melting device is fixed to the first guide roller of the base, and the first guide roller is slidably penetrated by a material taker. The material taker is fixed to the base through a first telescopic hydraulic cylinder, and the material taker blows the raw material into the heating groove of the heater through a blowing pipe; a male mold seat is fixed to the side wall of the heating groove, and a male mold is fixed to the male mold seat. The male mold is connected to the blowing pipe in the buckled state through a guide groove, and a second guide roller is fixed between the male mold seat and the base; after the plastic is cooled and solidified, the male mold and the female mold are separated, and the molded plastic parts are directly taken out by a manipulator, which is likely to cause damage to the plastic parts.

[0004] In order to solve the above problems, we proposed a plastic parts injection molding equipment and injection molding process. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the background technology and to propose a plastic part injection molding equipment and injection molding process.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a plastic parts injection molding equipment, comprising a workbench, a motor is fixed on the workbench, a driving end of the motor is fixedly connected to a bottom plate, a fixed mold is fixedly arranged on the bottom plate, an outer wall of the fixed mold is fixedly connected to a fixed plate, an oil cylinder is fixedly arranged on the end of the fixed plate, a movable mold used in conjunction with the fixed mold is fixed on the end of the oil cylinder, a support plate is fixedly arranged on the upper side wall of the bottom plate, a water tank 1 is fixedly arranged on the upper end of the support plate, a cooling chamber is opened inside the fixed mold, an inclined drainage pipe is fixedly connected between the lower side wall of the water tank 1 and the cooling chamber, a water tank 2 is fixedly arranged on the lower side wall of the bottom plate, and a return pipe is fixedly connected between the upper side wall of the water tank 2 and the cooling chamber;

[0007] The workbench is fixedly connected with a vertical plate, the upper end of the vertical plate is fixedly embedded with a bearing, the inner ring of the bearing is fixed with a support shaft, the end of the support shaft is fixed to the outer wall of the bottom plate, and the support shaft is arranged to coincide with the center line of the motor;

[0008] The workbench is provided with a falling mechanism, which includes two symmetrically arranged inclined plates fixedly connected to the side walls of the workbench, the ends of the two inclined plates are commonly fixedly connected with a circular ring, the center of the circular ring and the center of the supporting shaft are located on the same straight line, a plurality of knocking rods are slidably inserted on the circular ring, each of the knocking rods is sleeved with a reset spring, the two ends of the reset spring are respectively fixedly connected to the knocking rod and the outer wall of the circular ring, a pushing opening is provided at the end of the knocking rod, a pushing plate is fixedly connected to the outer wall of the end of the supporting shaft, a notch is provided at the end of the pushing plate, and the inner wall of the notch is provided with two symmetrically arranged inclined surfaces.

[0009] In the above-mentioned plastic parts injection molding equipment, a heat-conducting copper plate is fixedly embedded in the lower side wall of the second water tank.

[0010] In the above-mentioned plastic parts injection molding equipment, the lower side wall of the base plate is fixedly connected with a connecting plate, the end of the connecting plate is fixedly connected with a motor, the driving end of the motor is fixedly connected with multiple heat-conducting nets, and the upper surface of the heat-conducting nets is on the same horizontal line as the lower surface of the water tank 2.

[0011] In the above-mentioned plastic parts injection molding equipment, a moving rod is slidably inserted on the outer wall of the second water tank, and the end of the moving rod located inside the second water tank is fixedly connected to a water pusher plate, and a connecting spring is sleeved on the moving rod, and the two ends of the connecting spring are respectively fixedly connected to the inner wall of the second water tank and the outer wall of the moving rod, and the end of the moving rod located outside the second water tank is fixedly connected to an arc plate in contact with the end of the heat conductive network.

[0012] In the above-mentioned plastic part injection molding equipment, the plurality of knocking rods are evenly distributed within the range of 0-150° on the surface of the circular ring.

[0013] In the above-mentioned plastic part injection molding equipment, an electric push rod is fixedly embedded on the fixed plate, and a driving end of the electric push rod is fixedly connected to a push plate.

[0014] A plastic part injection molding process comprises the following steps:

[0015] S1, fasten the fixed mold and the movable mold together, pump the molten raw material into the fixed mold, and form the plastic part;

[0016] S2, the cooling water in the water tank 1 is discharged to the cooling chamber through the drain pipe, and the plastic part is cooled by the cooling water to cool and shape the plastic part;

[0017] S3, after the plastic part is cooled and formed, the motor drives the bottom plate to rotate, and at the same time drives the support shaft and the push plate to rotate. As the push plate rotates, the end of the push plate enters the push port, pushing the knocking rod to move away from the fixed mold. When the push plate turns away from the knocking rod, under the reverse elastic force of the reset spring, the knocking rod moves back to contact the fixed mold, knocks the fixed mold, generates vibration, and separates the molded plastic part from the inner wall of the fixed mold. The push plate then contacts the next knocking rod, and the above process is repeated, so that the knocking rod continuously knocks the fixed mold;

[0018] S4, after the bottom plate turns over once, the water in the water tank 2 flows back to the water tank 1 through the cooling cavity.

[0019] Compared with the existing technology, the advantages of this plastic parts injection molding equipment are:

[0020] 1. Set up multiple heat-conducting nets, and use the method of rotating the motor to replace the heat-conducting nets, so that the heat-conducting nets with high temperatures are in contact with the air for heat dissipation, and the heat-conducting nets with low temperatures are in contact with the heat-conducting copper plate, which quickly reduces the temperature of the heat-conducting copper plate. The heat-conducting copper plate extracts the heat of the water in the second water tank, realizes the rapid cooling of the cooling water, and quickly extracts the heat, so that the plastic parts are quickly cooled and fixed;

[0021] 2. When the motor drive end rotates to replace the heat-conducting net in contact with the heat-conducting copper plate, the end of the heat-conducting net will contact the outer wall of the arc plate, thereby pushing the arc plate to move outward. When the heat-conducting net turns away from the arc plate, the arc plate and the water pusher will move back under the reverse elastic force of the connecting spring, thereby pushing the water to flow, and the flowing water will dissipate heat faster;

[0022] 3. A circular ring, a knocking rod and a push plate are provided. The middle part of the cross section of the notch is thick and the two sides are thin. When the push plate rotates and contacts the push port, it contacts the thin position and then the thick position, that is, the push port moves along the inclined surface, and the knocking rod moves to the side away from the fixed mold. When the push plate is separated from the push port, under the reverse elastic force of the reset spring, the knocking rod moves back and contacts the fixed mold, knocks the fixed mold, causes the fixed mold to vibrate, and accelerates the separation of the plastic part from the fixed mold. As the push plate rotates, multiple knocking rods knock the fixed mold in turn, and accelerate the separation of the plastic part from the inner wall of the fixed mold through vibration;

[0023] To sum up, the water in the present invention automatically flows from a high position to a low position, absorbs the heat in the fixed mold, and makes the plastic parts cool down and shape quickly. The cooling process can be accelerated by replacing the heat-conducting network. After the plastic parts are shaped, the push plate is brought into contact with the knocking rod through the rotation of the bottom plate, so that the knocking rod moves to knock on the fixed mold, generating vibration, and accelerating the separation of the plastic parts from the inner wall of the fixed mold. At the same time, after the bottom plate is flipped, the cooling water can automatically flow back into the water tank, without the need for equipment, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a plastic part injection molding device proposed by the present invention;

[0025] Figure 2 This is a structural schematic diagram of a plastic part injection molding device proposed by the present invention from another angle;

[0026] Figure 3 This is a schematic diagram of the structure of the connection between the ring and the support shaft in a plastic part injection molding device proposed by the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of a push plate in a plastic part injection molding device proposed by the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the connection between the heat dissipation network and the arc plate in a plastic part injection molding device proposed by the present invention;

[0029] Figure 6 This is a partial structural schematic diagram of a plastic part injection molding device proposed by the present invention when the bottom plate rotates;

[0030] Figure 7 This is a schematic structural diagram of a plastic part injection molding device proposed by the present invention after a bottom plate is flipped.

[0031] In the figure: 1 workbench, 2 motor, 3 bottom plate, 4 fixed mold, 5 fixed plate, 6 oil cylinder, 7 movable mold, 8 water tank 1, 9 drain pipe, 10 water tank 2, 11 vertical plate, 12 support shaft, 13 inclined plate, 14 ring, 15 knock rod, 16 push port, 17 return spring, 18 push plate, 19 inclined surface, 20 electric push rod, 21 push plate, 22 heat conduction network, 23 moving rod, 24 connecting spring, 25 water push plate, 26 arc plate, 27 motor, 28 connecting plate. DETAILED DESCRIPTION

[0032] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0033] Reference Figure 1-Figure 7A plastic parts injection molding equipment comprises a workbench 1, a motor 2 is fixed on the workbench 1, a driving end of the motor 2 is fixedly connected to a bottom plate 3, a fixed mold 4 is fixedly arranged on the bottom plate 3, a fixed plate 5 is fixedly connected to the outer wall of the fixed mold 4, an oil cylinder 6 is fixedly arranged at the end of the fixed plate 5, a movable mold 7 used in conjunction with the fixed mold 4 is fixed at the end of the oil cylinder 6, a support plate is fixedly arranged on the upper side wall of the bottom plate 3, a water tank 1 8 is fixed on the upper end of the support plate, a cooling cavity is opened inside the fixed mold 4, an inclined drainage pipe 9 is fixedly connected between the lower side wall of the water tank 1 8 and the cooling cavity, a water tank 2 10 is fixed on the lower side wall of the bottom plate 3, a heat-conducting copper plate is fixedly embedded in the lower side wall of the water tank 2 10, and the heat of the water in the water tank 2 10 is extracted through the heat-conducting copper plate to realize rapid cooling of the cooling water, a return water pipe is fixedly connected between the upper side wall of the water tank 2 10 and the cooling cavity, and a connecting plate 28 is fixedly connected to the lower side wall of the bottom plate 3 , the end of the connecting plate 28 is fixedly connected with a motor 27, and the driving end of the motor 27 is fixedly connected with a plurality of heat-conducting nets 22. The upper surface of the heat-conducting net 22 and the lower surface of the water tank 10 are located on the same horizontal line, and the same horizontal line ensures that the heat-conducting net 22 can contact with the heat-conducting copper plate. After the fixed mold 4 and the movable mold 7 are buckled, the molten raw material is introduced into the fixed mold 4 for molding, and the cooling water in the water tank 8 is introduced into the cooling chamber. The cooling water absorbs heat to accelerate the shaping of the plastic part. In order to ensure that the temperature of the cooling water is low, a single heat-conducting net 22 cannot effectively and quickly extract the heat from the heat-conducting copper plate, so that the heat-conducting copper plate quickly absorbs the heat of the cold water body. Therefore, the motor 27 is rotated to replace the heat-conducting net 22, so that the heat-conducting net 22 with a high temperature contacts with the air for heat dissipation, and the heat-conducting net 22 with a low temperature contacts with the heat-conducting copper plate to quickly extract the heat, so that the plastic part is quickly cooled and shaped;

[0034] Furthermore, a solenoid valve is provided on the drain pipe 9, and opening the solenoid valve can discharge the water into the fixed mold 4 to cool and shape the plastic part;

[0035] A moving rod 23 is slidably inserted on the outer wall of the water tank 10, and one end of the moving rod 23 located in the water tank 10 is fixedly connected to a water pushing plate 25, and a connecting spring 24 is sleeved on the moving rod 23. The two ends of the connecting spring 24 are respectively fixedly connected to the inner wall of the water tank 10 and the outer wall of the moving rod 23, and the one end of the moving rod 23 located outside the water tank 10 is fixedly connected to an arc plate 26 that contacts the end of the heat-conducting net 22. In the process of the motor 27 driving end rotating to replace the heat-conducting net 22 that contacts the heat-conducting copper plate, the end of the heat-conducting net 22 will contact the outer wall of the arc plate 26, thereby pushing the arc plate 26 to move outward. When the heat-conducting net 22 turns away from the arc plate 26, under the reverse elastic force of the connecting spring 24, the arc plate 26 and the water pushing plate 25 will move back, thereby pushing the water body to flow. The flowing water body dissipates heat faster, can export the water body to the heat-conducting copper plate and the air faster, and can also accelerate the shaping of plastic parts;

[0036] A vertical plate 11 is fixedly connected to the workbench 1, a bearing is fixedly embedded in the upper end of the vertical plate 11, a support shaft 12 is fixed to the inner ring of the bearing, the end of the support shaft 12 is fixed to the outer wall of the bottom plate 3, and the support shaft 12 is arranged to coincide with the center line of the motor 2;

[0037] The workbench 1 is provided with a falling mechanism, which includes two symmetrically arranged inclined plates 13 fixedly connected to the upper side wall of the workbench 1, and the ends of the two inclined plates 13 are commonly fixedly connected with a circular ring 14, and the center of the circular ring 14 and the center of the circle of the support shaft 12 are located on the same straight line, and a plurality of knocking rods 15 are slidably inserted on the circular ring 14, and the plurality of knocking rods 15 are evenly distributed within the range of 0-150° on the surface of the circular ring 14, and each knocking rod 15 is sleeved with a reset spring 17, and the two ends of the reset spring 17 are respectively fixedly connected to the knocking rod 15 and the outer wall of the circular ring 14, and a push opening 16 is provided at the end of the knocking rod 15, and a push plate 18 is fixedly connected to the outer wall of the end of the support shaft 12, and a notch is provided at the end of the push plate 18, and the inner wall of the notch is provided with two symmetrically arranged inclined surfaces 19. After the plastic part is cooled and shaped, the motor 2 is started to drive the bottom plate 3 to rotate. At this time, the bottom plate 3 performs a flipping motion, and the support shaft 12 drives the push plate 18 to rotate. Since the symmetrically arranged inclined surfaces 19 are provided, the cross section of the notch is thick in the middle and thin on both sides. When contacting the push opening 16, it first contacts the thin position and then contacts the thick position, that is, the push opening 16 moves along the inclined surface 19, and the knocking rod 15 moves to the side away from the fixed mold 4. When the push plate 18 is separated from the push opening 16, under the reverse elastic force of the reset spring 17, the knocking rod 15 moves back and contacts the fixed mold 4, and knocks the fixed mold 4, so that the fixed mold 4 vibrates, and accelerates the separation of the plastic part from the fixed mold 4. As the push plate 18 rotates, multiple knocking rods 15 knock the fixed mold 4 in turn;

[0038] To further illustrate, the bottom plate 3 and the push plate 18 rotate synchronously, the push plate 18 contacts the knocking rods 15 at different positions, and the fixed mold 4 can also correspond to the position of the knocking rod 15, thereby achieving continuous knocking vibration.

[0039] Further explanation: in order to fully transmit the vibration to the plastic part, the thickness of the fixed mold 4 near the knocking rod 15 can be slightly reduced.

[0040] An electric push rod 20 is fixedly embedded on the fixed plate 5, and a driving end of the electric push rod 20 is fixedly connected to a push plate 21. After the base plate 3 is flipped over, the driving end of the oil cylinder 6 extends out. After the plastic part is pushed out, the driving end of the electric push rod 20 extends out and pushes the plastic part away from the workbench 1 through the push plate 21.

[0041] A plastic part injection molding process comprises the following steps:

[0042] S1, fasten the fixed mold 4 and the movable mold 7 together, pump the molten raw material into the fixed mold 4, and form the plastic part;

[0043] S2, the cooling water in the water tank 8 is discharged to the cooling chamber through the drain pipe 9, and the plastic part is cooled by the cooling water to be cooled and shaped;

[0044] S3, after the plastic part is cooled and formed, the motor 2 drives the bottom plate 3 to rotate, and at the same time drives the support shaft 12 and the push plate 18 to rotate. As the push plate 18 rotates, the end of the push plate 18 enters the push port 16, pushing the knocking rod 15 to move away from the fixed mold 4. When the push plate 18 turns away from the knocking rod 15, under the reverse elastic force of the reset spring 17, the knocking rod 15 moves back and contacts the fixed mold 4, knocks the fixed mold 4, generates vibration, and separates the molded plastic part from the inner wall of the fixed mold 4. The push plate 18 contacts the next knocking rod 15 again, and the above process is repeated, so that the knocking rod 15 continuously knocks the fixed mold 4;

[0045] S4, after the bottom plate 3 turns over once, the water in the water tank 2 10 flows back to the water tank 1 8 through the cooling cavity.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A plastic parts injection molding device, comprising a workbench (1), characterized in that: A motor (2) is fixed on the workbench (1), the driving end of the motor (2) is fixedly connected to a bottom plate (3), a fixed mold (4) is fixedly arranged on the bottom plate (3), the outer wall of the fixed mold (4) is fixedly connected to a fixed plate (5), an end of the fixed plate (5) is fixedly arranged with an oil cylinder (6), and an end of the oil cylinder (6) is fixedly arranged with a movable mold (7) used in conjunction with the fixed mold (4), a support plate is fixedly arranged on the upper side wall of the bottom plate (3), a water tank 1 (8) is fixed on the upper end of the support plate, a cooling chamber is provided inside the fixed mold (4), an inclined drainage pipe (9) is fixedly connected between the lower side wall of the water tank 1 (8) and the cooling chamber, a water tank 2 (10) is fixedly arranged on the lower side wall of the bottom plate (3), and a return pipe is fixedly connected between the upper side wall of the water tank 2 (10) and the cooling chamber; The workbench (1) is fixedly connected to a vertical plate (11), a bearing is fixedly embedded in the upper end of the vertical plate (11), a support shaft (12) is fixed to the inner ring of the bearing, the end of the support shaft (12) is fixed to the outer wall of the bottom plate (3), and the support shaft (12) is arranged to coincide with the center line of the motor (2); The workbench (1) is provided with a falling mechanism, which comprises two symmetrically arranged inclined plates (13) fixedly connected to the upper side wall of the workbench (1), the ends of the two inclined plates (13) are commonly fixedly connected with a circular ring (14), the center of the circular ring (14) and the center of the support shaft (12) are located on the same straight line, a plurality of knocking rods (15) are slidably inserted on the circular ring (14), each of the knocking rods (15) is sleeved with a reset spring (17), the two ends of the reset spring (17) are respectively fixedly connected to the knocking rod (15) and the outer wall of the circular ring (14), the end of the knocking rod (15) is provided with a push opening (16), the outer wall of the end of the support shaft (12) is fixedly connected with a push plate (18), the end of the push plate (18) is provided with a notch, and the inner wall of the notch is provided with two symmetrically arranged inclined surfaces (19).

2. A plastic part injection molding device according to claim 1, characterized in that: A heat-conducting copper plate is fixedly embedded on the lower side wall of the water tank 2 (10).

3. A plastic part injection molding device according to claim 2, characterized in that: The lower side wall of the bottom plate (3) is fixedly connected to a connecting plate (28), the end of the connecting plate (28) is fixedly connected to a motor (27), the driving end of the motor (27) is fixedly connected to a plurality of heat-conducting nets (22), and the upper surface of the heat-conducting nets (22) is located on the same horizontal line as the lower surface of the water tank 2 (10).

4. A plastic part injection molding device according to claim 3, characterized in that: A moving rod (23) is slidably inserted on the outer wall of the second water tank (10), and one end of the moving rod (23) located inside the second water tank (10) is fixedly connected to a water push plate (25), and a connecting spring (24) is sleeved on the moving rod (23), and the two ends of the connecting spring (24) are respectively fixedly connected to the inner wall of the second water tank (10) and the outer wall of the moving rod (23), and one end of the moving rod (23) located outside the second water tank (10) is fixedly connected to an arc plate (26) in contact with the end of the heat conducting network (22).

5. The plastic part injection molding equipment according to claim 1, characterized in that: The plurality of knocking rods (15) are evenly distributed within the range of 0-150° on the surface of the ring (14).

6. The plastic part injection molding equipment according to claim 1, characterized in that: An electric push rod (20) is fixedly embedded on the fixed plate (5), and a driving end of the electric push rod (20) is fixedly connected to a push plate (21).

7. An injection molding process using a plastic part injection molding device as claimed in claim 1, characterized in that: The following steps are involved: S1, fastening the fixed mold (4) and the movable mold (7), pumping the molten raw material into the fixed mold (4), and forming the plastic part; S2, the cooling water in the water tank (8) is discharged to the cooling chamber through the drain pipe (9), and the plastic part is cooled by the cooling water, so that the plastic part is cooled and shaped; S3, after the plastic part is cooled and formed, the motor (2) drives the bottom plate (3) to rotate, and at the same time drives the support shaft (12) and the push plate (18) to rotate. As the push plate (18) rotates, the end of the push plate (18) enters the push opening (16), pushing the knocking rod (15) to move away from the fixed mold (4). When the push plate (18) turns away from the knocking rod (15), under the reverse elastic force of the return spring (17), the knocking rod (15) moves back and contacts the fixed mold (4), knocks the fixed mold (4), generates vibration, and causes the molded plastic part to separate from the inner wall of the fixed mold (4). The push plate (18) contacts the next knocking rod (15) again, and the above process is repeated, so that the knocking rod (15) continuously knocks the fixed mold (4); S4, after the bottom plate (3) turns over once, the water in the water tank 2 (10) flows back into the water tank 1 (8) through the cooling cavity.

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