Anti-sticking mold ejection device for plastic shell

Abstract

The utility model discloses an anti-sticking mold ejection device for a plastic shell, which relates to the field of molds and comprises a base, a lower mold is arranged at the top of the base, a cylinder is arranged on the inner wall of the bottom of the base, the top of the cylinder is fixedly connected with the bottom of the lower mold, and a piston ejector pin is arranged in the cylinder. The cylinder is fixedly connected with one end of an air inlet pipe and one end of an air outlet pipe, and the one end of the air inlet pipe and the one end of the air outlet pipe are both communicated with the cylinder. In this way, the contact area can be increased, damage to the plastic shell caused by concentrated stress points can be reduced, safety is high, meanwhile, when gas is blown into the position between the formed plastic shell and the inner wall of the lower die, the gas can make contact with the whole plastic shell and extrude the plastic shell, the plastic shell can be better separated from the lower die, adhesion can be prevented, and the service life of the plastic shell is prolonged. And the yield of the plastic shell is improved.

Description

Technical Field

[0001] This utility model relates to the field of molds, and in particular to a plastic shell anti-sticking mold ejection device. Background Technology

[0002] Molds are various molds and tools used in industrial production to obtain desired products through methods such as injection molding, blow molding, extrusion, die casting, forging, smelting, and stamping. In short, a mold is a tool used to create shaped articles. Generally, plastic shells are integrally molded using a mold. During the injection molding of a plastic shell, an ejector device is needed to eject the molded shell from the mold. Existing ejector devices typically use motors or electric cylinders to directly eject the shell. Because the ejection force of these devices is fixed, they can quickly eject the plastic shell. However, if the plastic shell sticks to the mold, it is easily torn, causing unnecessary losses. Therefore, it is necessary to propose an anti-sticking ejector device for plastic shells to solve the above problems. Utility Model Content

[0003] The purpose of this utility model is to provide a plastic shell anti-sticking mold ejection device to solve the problem that the plastic shell sticks to the mold, which easily tears the plastic shell and causes unnecessary losses.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a plastic shell anti-sticking mold ejection device, comprising a base, a lower mold disposed on the top of the base, a cylinder disposed on the inner wall of the bottom of the base, the top of the cylinder being fixedly connected to the bottom of the lower mold, a piston pin disposed inside the cylinder, a return spring disposed on the inner wall of the bottom surface of the cylinder, one end of the return spring being fixedly connected to the bottom surface of the piston pin, an air pump disposed on the bottom surface of the base, and an air inlet pipe being connected between the cylinder and the air pump.

[0005] Preferably, the bottom of the lower mold has a first circular hole, and the top of the piston pin is movably embedded in the concave hole.

[0006] Preferably, a cross plate is provided inside the piston pin near the top, and a tension spring is fixedly installed on the upper surface of the cross plate. A second circular hole is opened at the top of the piston pin, and a sealing plate is movably embedded in the second circular hole. The upper end of the tension spring is fixedly connected to the bottom surface of the sealing plate. A vent hole is opened on the inner wall of the piston pin, and a vent pipe is provided on the inner wall of the cylinder. An air inlet communicating with the lower end of the vent pipe is opened on the inner wall of the cylinder near the bottom, and an upper air port communicating with the upper end of the vent pipe is opened on the inner wall of the cylinder, and the upper air port is located above the air inlet. The upper air port is configured to cooperate with the vent hole, and both the air inlet and the upper air port are connected to the interior of the cylinder.

[0007] Preferably, an exhaust port is provided on the side of the cylinder away from the air inlet pipe, and a solenoid valve is provided inside the exhaust port.

[0008] Preferably, the top of the piston pin and the top of the sealing plate are both provided with a protruding edge, and the inner walls of the upper ends of the first and second circular holes are both provided with annular limiting grooves for the protruding edges to fit together.

[0009] The technical effects and advantages of this utility model are as follows:

[0010] 1. After the plastic shell has cooled and solidified, start the air pump and blow air into the cylinder through the air inlet pipe. As the air pressure increases, the piston pin gradually rises and ejects the solidified plastic shell. Because the air is blown in gradually, the force of the piston pin gradually increases. When a certain force is reached, the plastic shell can be slowly ejected. This increases the contact area and reduces the concentration of force points that could damage the plastic shell. This avoids directly ejecting the plastic shell that is stuck to the inner wall of the mold and causing damage, thus ensuring high safety.

[0011] 2. The gas pushes the piston pin upward. When the vent hole on the piston pin connects with the upper air port on the inner wall of the cylinder, the gas enters the piston pin sequentially through the air inlet, vent pipe, upper air port, and vent hole. At this time, the gas will push up the sealing plate inside the piston pin, causing the sealing plate to rise slightly and separate from the inner wall of the first circular hole at the top of the piston pin. Then, the gas will enter the lower mold through the gap opened by the sealing plate. When the gas is blown between the molded plastic shell and the inner wall of the lower mold, the gas will contact the entire plastic shell, compressing the plastic shell so that the plastic shell can better separate from the lower mold, preventing sticking and improving the yield of the plastic shell. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the anti-sticking mold ejection device for the plastic shell of this utility model.

[0013] Figure 2 This is a first-view sectional view of the plastic shell anti-sticking mold ejection device of this utility model.

[0014] Figure 3 This utility model Figure 2 An enlarged schematic diagram of the structure at point A in the middle.

[0015] Figure 4 This is a second-view sectional view of the plastic shell anti-sticking mold ejection device of this utility model.

[0016] Figure 5 This is a third-angle sectional view of the plastic shell anti-sticking mold ejection device of this utility model.

[0017] Figure 6 This utility model Figure 4 Enlarged schematic diagram of the structure at point B.

[0018] In the diagram: 1. Base; 2. Lower mold; 3. Cylinder; 4. Piston pin; 5. Air inlet pipe; 6. Air pump; 7. Exhaust port; 8. Return spring; 9. Cross plate; 10. Tension spring; 11. Sealing plate; 12. Vent pipe; 13. Vent hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] This utility model provides, for example Figures 1-6 The plastic shell anti-sticking mold ejection device shown includes a base 1, and a lower mold 2 is provided on the top of the base 1. The lower mold 2 adopts a common mold lower mold base on the market, which is a basic component of the mold, so it is not limited.

[0021] To address the problem of the plastic shell sticking to the mold, easily tearing the plastic shell and causing unnecessary losses, this invention features a cylinder 3 on the bottom inner wall of the base 1, with the top of the cylinder 3 fixedly connected to the bottom of the lower mold 2. A piston pin 4 is installed inside the cylinder 3, and a return spring 8 is installed on the bottom inner wall of the cylinder 3, with one end of the return spring 8 fixedly connected to the bottom surface of the piston pin 4. An air pump 6 is installed on the bottom surface of the base 1, and an air inlet pipe 5 connects the cylinder 3 and the air pump 6. A first circular hole is opened at the bottom of the lower mold 2, and the top of the piston pin 4 is movably embedded in the concave hole. An exhaust port 7 is located on the side of the cylinder 3 away from the air inlet pipe 5, and a solenoid valve is installed inside the exhaust port 7. During operation, the plastic shell is placed on the lower mold 2 of the mold... After internal molding and cooling, the upper mold detaches from the mold. The air pump 6 is started, and air is blown into the cylinder 3 through the air inlet pipe 5. As the air pressure increases, the piston pin 4 gradually rises to eject the molded plastic shell. The gradual rise of the piston pin 4 stretches the return spring 8. Because the air is blown in gradually, the force of the air on the piston pin 4 gradually increases. When a certain force is reached, the plastic shell can be slowly ejected. This increases the contact area and reduces the concentrated force points that could damage the plastic shell. It also avoids directly ejecting the plastic shell that is stuck to the inner wall of the mold, thus ensuring high safety. After the plastic shell is ejected, the solenoid valve in the exhaust port 7 opens, and the air is discharged. At this time, the piston pin 4 returns to its original position under the elastic force of the return spring 8, making it convenient to produce plastic shells again.

[0022] It should be noted that the protruding edge at the top of the piston ejector pin 4 can be perfectly embedded in the annular limiting groove at the upper end of the first circular hole, which can completely seal the first circular hole at the bottom of the lower mold 2, ensuring that no plastic solution will flow into the cylinder 3. This setting is a conventional setting, so it will not be described in detail.

[0023] Furthermore, this utility model has a cross plate 9 provided inside the piston pin 4 near the top, and a tension spring 10 fixedly installed on the upper surface of the cross plate 9. A second circular hole is opened at the top of the piston pin 4, and a sealing plate 11 is movably embedded in the second circular hole. The upper end of the tension spring 10 is fixedly connected to the bottom surface of the sealing plate 11. A vent hole 13 is opened on the inner wall of the piston pin 4, and a vent pipe 12 is provided on the inner wall of the cylinder 3. An air inlet communicating with the lower end of the vent pipe 12 is opened on the inner wall of the cylinder 3 near the bottom, and an upper air port communicating with the upper end of the vent pipe 12 is opened on the inner wall of the cylinder 3. The upper air port is located above the air inlet, and the upper air port is configured to cooperate with the vent hole 13. Both the air inlet and the upper air port are connected to the interior of the cylinder 3. During operation, the gas pushes the piston pin 4 upward. When the piston pin... When the vent hole 13 on cylinder 4 is connected to the upper air port on the inner wall of cylinder 3, the gas enters the piston pin 4 through the air inlet, vent pipe 12, upper air port and vent hole 13 in sequence. At this time, the gas will push up the sealing plate 11 inside the piston pin 4, so that the sealing plate 11 rises slightly and separates from the inner wall of the first circular hole at the top of the piston pin 4. At this time, the gas will enter the lower mold 2 through the gap opened by the sealing plate 11. When the gas is blown into the space between the molded plastic shell and the inner wall of the lower mold 2, the gas will contact the entire plastic shell and squeeze the plastic shell, so that the plastic shell can be better separated from the lower mold 2, which can prevent sticking and improve the yield of the plastic shell. When the finished product is ejected, during the exhaust, under the elastic force of the tension spring 10, the sealing plate 11 resets and seals the first circular hole at the top of the piston pin 4, which is convenient for reuse.

[0024] It should be noted that the convex edge at the top of the sealing plate 11 can be perfectly embedded in the annular limiting groove at the upper end of the second circular hole and can seal the second circular hole. This setting is a conventional setting, so it will not be described in detail.

Claims

1. A plastic shell anti-sticking ejection device, comprising a base (1), characterized in that: The top of the base (1) is provided with a lower mold (2), the inner wall of the bottom of the base (1) is provided with a cylinder (3), and the top of the cylinder (3) is fixedly connected with the bottom of the lower mold (2), the cylinder (3) is provided with a piston plunger (4), the bottom surface of the cylinder (3) is provided with a reset spring (8), one end of the reset spring (8) is fixedly connected with the bottom surface of the piston plunger (4), the bottom surface of the base (1) is provided with a blowing pump (6), and the cylinder (3) and the blowing pump (6) are communicated with an air inlet pipe (5).

2. A plastic shell anti-sticking ejection device according to claim 1, characterized in that: The bottom of the lower mold (2) is provided with a first circular hole, and the top end of the piston plunger (4) is movably embedded in the concave hole.

3. A plastic shell anti-sticking ejection device according to claim 2, characterized in that: The inside of the piston plunger (4) is provided with a cross plate (9) close to the top, the upper surface of the cross plate (9) is fixedly installed with a tension spring (10), the top end of the piston plunger (4) is provided with a second circular hole, the second circular hole is movably embedded with a sealing plate (11), the upper end of the tension spring (10) is fixedly connected with the bottom surface of the sealing plate (11), the inner wall of the piston plunger (4) is provided with a ventilation hole (13), the inner wall of the cylinder (3) is provided with a ventilation pipe (12), the inner wall of the cylinder (3) is provided with an air inlet close to the bottom, the air inlet is communicated with the lower end of the ventilation pipe (12), the inner wall of the cylinder (3) is provided with an upper air inlet communicated with the upper end of the ventilation pipe (12), and the upper air inlet is located above the air inlet, the upper air inlet and the ventilation hole (13) are matched, and the air inlet and the upper air inlet are communicated with the inside of the cylinder (3).

4. A plastic shell anti-sticking ejection device according to claim 3, characterized in that: The cylinder (3) is provided with an exhaust port (7) away from the air inlet pipe (5), and the exhaust port (7) is provided with a solenoid valve.

5. A plastic shell anti-sticking ejection device according to claim 4, wherein: The top end of the piston plunger (4) and the top of the sealing plate (11) are provided with a convex edge, and the inner wall of the upper end of the first circular hole and the second circular hole is provided with an annular limiting groove for the convex edge. The top end of the piston plunger (4) and the top of the sealing plate (11) are provided with a convex edge, and the inner wall of the upper end of the first circular hole and the second circular hole is provided with an annular limiting groove for the convex edge.

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