Ejection structure of injection mold

Abstract

The utility model discloses an ejection structure of an injection mold, which belongs to the technical field of injection molds and is characterized in that a liquid storage cavity cover with a sealing ring is fixed at the upper end of each of liquid storage cavities in mold bodies on two sides of a lower mold, and two pressing plate pressing rods respectively and sequentially penetrate through the liquid storage cavity covers and liquid storage cavity pressing rod holes to be fixed with a movable plate; a piston plate is arranged on the pressing rod of the pressing plate in each of the two liquid storage cavities, a sealing ring is arranged on each piston plate, and a sealing ring (12) is arranged in a pressing rod hole; the two liquid storage boxes are fixed to the two side faces of the lower die respectively and connected with the liquid guide pipe I on one side of the liquid storage cavity through the liquid guide pipe III, the electronic valve is arranged on the liquid guide pipe III, the liquid guide pipe II on the other side of the liquid storage cavity is communicated with a die cavity of the lower die through the nozzle, and the liquid storage boxes are opened or closed through the electronic valve. And communication or closing of the liquid guide pipe III, the liquid guide pipe I, the liquid storage cavity, the liquid guide pipe II and the nozzle is realized. And the function of smoothly ejecting the plastic product out of the injection mold is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, and specifically relates to an ejection structure of an injection mold. Background Art

[0002] Injection molding is a method for manufacturing industrial product shapes. Injection molds usually include an upper mold and a lower mold. A mold cavity is formed between the upper mold and the lower mold. An injection hole is opened on the upper mold, and a colloid is injected into the mold cavity through the injection hole and waits for the colloid to solidify to form a molded injection product. In order to better separate the injection product from the injection mold, a demolding device, that is, an ejection structure, is generally arranged inside the lower mold. The ejection structure in the prior art simply ejects the injection product through a spring and a ejector pin. This method easily causes the product to adhere to the surface of the cavity because during the molding production process, due to gas decomposition at high material temperature, after long-term production, there will be residual substances adhering near the ejector rod or hole, resulting in difficult reset. There are gaps in the cavity. When injecting the colloid again during injection molding, the colloid is injected behind the mold cavity, and after the colloid solidifies, the ejection and retraction actions are abnormal, and the spring cannot function, so that the ejection structure fails and cannot normally eject the injection product from the injection mold.

[0003] Currently, during production, to prevent problems such as the product and colloid decomposition causing failure to eject, the method of manually spraying a demolding agent before mold clamping is adopted to form a thin film in the mold cavity to prevent decomposition products from adhering to the ejector rod and hole positions, facilitating the ejection and demolding of the product after injection molding. However, manual spraying of the demolding agent is uneven, cannot be quantified, and cannot be stably sprayed in place, resulting in decomposition products of the injection mold adhering to the ejector rod and hole, making it difficult to eject and demold the product, and the efficiency of manual spraying of the demolding agent is low, which is not conducive to mass production. Summary of the Invention

[0004] In order to solve the problems of uneven manual spraying of the demolding agent before mold clamping of the existing injection mold, easy difficulty in ejecting and demolding the product, inconvenient control, and low efficiency, the utility model provides an ejection structure of an injection mold, which realizes the function of automatically spraying the demolding agent into the mold cavity during the product molding process, thereby ejecting the plastic product from the inside of the injection mold, avoiding the adhesion of colloid decomposition products to the mold, preventing abnormal ejection actions, and the spring from not being able to reset, thus avoiding the failure of the ejection structure and ensuring that the ejection structure can smoothly eject the plastic product from the inside of the mold cavity.

[0005] The technical solution adopted by the present utility model is as follows: An ejection structure of an injection mold, comprising a lower mold, an upper mold, positioning columns, a movable plate, springs, a top plate and a pressing plate. The lower mold is arranged above the upper mold through two positioning columns. The movable plate is sleeved on two limiting rods of the lower mold, and a spring is sleeved on each of the two limiting rods. The top plate is arranged in the mold cavity of the lower mold, and two push rods of the top plate respectively pass through the mold body and are fixed to the movable plate. It is characterized in that it further comprises a liquid storage box, an electronic valve, a liquid storage cavity cover and a piston plate.

[0006] At the upper ends of the liquid storage cavities in the mold bodies on both sides of the lower mold, a liquid storage cavity cover is respectively fixed. The two pressing plate push rods respectively pass through the liquid storage cavity cover and the liquid storage cavity push rod holes in sequence and are fixed to the movable plate. A piston plate is respectively arranged on the pressing plate push rods in the two liquid storage cavities.

[0007] A liquid storage box is respectively fixed on both sides of the lower mold. The two liquid storage boxes are respectively connected to one side liquid guide pipe Ⅰ of the liquid storage cavity through a liquid guide pipe Ⅲ. An electronic valve is arranged on the liquid guide pipe Ⅲ. The other side liquid guide pipe Ⅱ of the liquid storage cavity communicates with the mold cavity of the lower mold through a nozzle. The liquid storage box is opened or closed through the electronic valve to realize the communication or disconnection with the liquid guide pipe Ⅲ, the liquid guide pipe Ⅰ, the liquid storage cavity, the liquid guide pipe Ⅱ and the nozzle.

[0008] The beneficial effects produced by the present utility model are as follows: 1. Through the present utility model, it is possible to realize the timely and accurate quantitative spraying of the release agent during the molding of plastic products, ensure the uniformity of the spraying amount and position, and be able to smoothly eject the plastic products from the inside of the injection mold, improving the problems of uneven manual spraying of the release agent and inconvenient control in the prior art, and being able to prevent difficulties in ejecting the products from the mold and sticking of the products to the mold.

[0009] 2. Through the present utility model, it is possible to realize the automatic spraying of the release agent, change the way of manual spraying of the release agent, greatly improve the stability of production, ensure the production efficiency, and realize automated production operations. Description of the Drawings

[0010] Figure 1 is a schematic structural diagram of the present utility model;

[0011] Figure 2 is a structural sectional view of the present utility model;

[0012] Figure 3 is a structural sectional view of the lower mold of the present utility model;

[0013] Figure 4 is a schematic diagram of an embodiment of the present utility model.

[0014] In the figure: 1. Lower mold; 1-1. Liquid storage cavity; 1-1-1. Pressing rod hole; 1-1-2. Top plate hole; 1-2. Liquid guide pipe I; 1-3. Liquid guide pipe II; 1-4. Nozzle; 1-5. Plug; 1-6. Lower mold bottom plate; 1-7. Inner cavity; 1-8. Limit rod; 1-9. Mold cavity; 2. Upper mold; 3. Positioning column; 4. Movable plate; 5. Spring; 6. Top plate; 7. Pressure plate; 8. Liquid storage box; 8-1. Liquid guide pipe III; 8-2. Liquid filling hopper; 9. Electric valve; 10. Liquid storage cavity cover; 11. Piston plate; 12. Sealing ring. Detailed implementation manner

[0015] As Figure 1 shown, an ejection structure of an injection mold includes a lower mold 1, an upper mold 2, a positioning column 3, a movable plate 4, a spring 5, a top plate 6, a pressure plate 7, a liquid storage box 8, an electric valve 9, a liquid storage cavity cover 10, a piston plate 11 and a sealing ring 12.

[0016] As Figure 3 shown, on both sides of the lower mold 1, a liquid storage cavity 1-1 is respectively provided in the mold body. At the lower ends of the two liquid storage cavities 1-1, a liquid guide pipe I 1-2 communicating with both side surfaces of the lower mold 1 and a pressing rod hole 1-1-1 communicating with the inner cavity 1-7 are respectively horizontally provided. On one side of the two liquid storage cavities 1-1 in the mold body, a liquid guide pipe II 1-3 is respectively vertically provided. One end of the liquid guide pipe II 1-3 communicates with the liquid storage cavity 1-1. The other end of the liquid guide pipe II 1-3 passes through a nozzle 1-4 to communicate with the mold cavity 1-9 of the lower mold 1, and the other path communicates with the upper surface of the lower mold 1 body. A plug 1-5 is provided on the liquid guide pipe II 1-3 on the upper surface of the mold body. Two top plate holes 1-1-2 communicating with the inner cavity 1-7 are provided in the mold cavity 1-9. Lower mold bottom plates 1-6 are respectively fixed on the raised walls on both sides of the bottom end of the lower mold 1. The lower mold bottom plate 1-6 and the bottom end surface of the lower mold 1 form an inner cavity 1-7. Two limit rods 1-8 are spacedly provided on the bottom end surface of the lower mold 1 in the inner cavity 1-7. A sealing ring 12 is provided on the inner wall of the pressing rod hole 1-1-1.

[0017] As Figure 2As shown in the figure, in the screw holes at the four corners of the upper mold 2, a positioning post 3 is respectively screwed and fixed. The lower ends of the four positioning posts 3 are inserted into the four positioning post holes of the lower mold 1. The upper mold 2 is located above the lower mold 1. The movable plate 4 is sleeved on the two limit rods 1-8 of the lower mold 1 through two movable plate holes. A spring 5 is respectively sleeved on the two limit rods 1-8. One end of the spring 5 is in contact and cooperation with the movable plate 4, and the other end of the spring 5 is in contact and cooperation with the lower mold bottom plate 1-6. The top plate 6 is arranged in the mold cavity 1-9 of the lower mold 1. The two push rods of the top plate 6 respectively pass through the two top plate holes 1-1-2 of the mold body and are fixed together with the movable plate 4 by screws. At the upper ends of the liquid storage cavities 1-1 in the mold bodies on both sides of the lower mold 1, a liquid storage cavity cover 10 with a sealing ring 12 is respectively fixed. The pressing rods of the two pressing plates 7 are respectively passed through the cavity cover holes of the liquid storage cavity cover 10 and the pressing rod holes 1-1-1 of the liquid storage cavity 1-1 in sequence and are screwed and fixed with the movable plate 4. A piston plate 11 is respectively arranged on the pressing rods of the two pressing plates 7 in the two liquid storage cavities 1-1. Sealing rings 12 are respectively arranged on the inner wall of the liquid storage cavity cover 10 and the inner wall of the cavity cover hole. A sealing ring 12 is arranged on the outer wall of the piston plate 11. A liquid storage box 8 is respectively fixed on both sides of the lower mold 1. A liquid adding hopper 8-2 is arranged on the liquid storage box 8. The two liquid storage boxes 8 are respectively screwed with the liquid guide pipe I 1-2 on one side of the liquid storage cavity 1-1 through the liquid guide pipe III 8-1. An electronic valve 9 is connected to the liquid guide pipe III 8-1. The liquid guide pipe II 1-3 on the other side of the liquid storage cavity 1-1 communicates with the mold cavity 1-9 of the lower mold 1 through a nozzle 1-4. The liquid storage box 8 is opened or closed through the electronic valve 9 to realize the communication or disconnection with the liquid guide pipe III 8-1, the liquid guide pipe I 1-2, the liquid storage cavity 1-1, the liquid guide pipe II 1-3, and the nozzle 1-4.

[0018] As Figure 4 shown, a method for using the ejection structure of an injection mold. Before using the injection mold to produce plastic products, first add the release agent into the two liquid storage boxes 8 respectively through the two liquid adding hoppers 8-2. After the mold opening action is completed, open the two electronic valves 9 so that the liquid guide pipe III 8-1, the liquid guide pipe I 1-2, the liquid storage cavity 1-1, the liquid guide pipe II 1-3, and the nozzle 1-4 on both sides of the injection mold are in a smooth state. The release agent flows into the two liquid storage cavities 1-1 respectively through the liquid guide pipe III 8-1 and the liquid guide pipe I 1-2;

[0019] When the mold starts to close, close the two electronic valves 9 so that the two liquid guide pipes III 8-1 are in a blocked state;

[0020] Close the upper mold 2 and the lower mold 1. At the same time, the upper mold 2 presses the two pressing plates 7 downward, thereby driving the movable plate 4 inside the inner cavity 1-7 to slide downward along the two limit rods 1-8, and driving the top plate 6 to slide downward into the internal storage groove at the bottom of the mold cavity 1-9. At this time, the two springs 5 are in a compressed state;

[0021] During the process of the upper mold 2 pressing down two pressing plates 7, the piston plate 11 slides downward inside the liquid storage cavity 1-1, squeezing the release agent in the liquid storage cavity 1-1. Since the liquid guide pipe III 8-1 is in a blocked state, the release agent is sprayed into the inside of the mold cavity 1-9 through two liquid pipes II 1-3 and two nozzles 1-4 respectively;

[0022] The plastic colloid is added into the mold cavity 1-9 through the injection hole provided on the upper mold 2. When the plastic colloid cools and solidifies, after the mold is opened, the solenoid valve 9 is opened, so that the two liquid guide pipes III 8-1 are in an open state. When the upper mold 2 moves upward and the upper mold 2 is separated from the lower mold 1, the two springs 5 stretch, pushing the movable plate 4 upward. The movable plate 4 drives the top plate 6 and the two pressing plates 7 to move upward. The top plate 6 moves upward, ejecting the plastic product out of the mold cavity 1-9. The pressing rod 7 moves upward, driving the piston plate 11 to move upward, and pumping the release agent into the two liquid storage cavities 1-1 through the liquid guide pipe III 8-1 and the liquid guide pipe I 1-2 respectively to supplement the release agent. Then, continue the above operations to complete the production and ejection of the plastic product again.

[0023] During the process of the upper mold 2 and the lower mold 1 of the injection mold being closed, the inner wall of the mold cavity 1-9 is sprayed with the release agent in a timely, accurate and quantitative manner, preventing the plastic colloid from contacting the cavity tightly, causing difficulties in ejecting and making the ejection structure ineffective. The function of smoothly ejecting the plastic product from the inside of the injection mold is realized. At the same time, the existing manual spraying method of the release agent is improved, and the inner wall of the mold groove 1-9 can be automatically and quickly sprayed with the release agent, saving time and effort, ensuring production efficiency, and realizing automated production operations.

Claims

1. An ejection structure of an injection mold, comprising a lower mold (1), an upper mold (2), a positioning column (3), a movable plate (4), a spring (5), a top plate (6) and a pressure plate (7), wherein the lower mold (1) is arranged above the upper mold (2) via two positioning columns (3), the movable plate (4) is sleeved on two limit rods (1-8) of the lower mold (1), and a spring (5) is sleeved on each of the two limit rods (1-8), the top plate (6) is arranged in a mold cavity (1-9) of the lower mold (1), and two push rods of the top plate (6) respectively pass through the mold body and are fixed to the movable plate (4), characterized in that: It also includes a liquid storage box (8), an electronic valve (9), a liquid storage chamber cover (10), and a piston plate (11); A liquid storage chamber cover (10) is fixed to the upper end of the liquid storage chamber (1-1) in the mold bodies on both sides of the lower mold (1), and the two pressure rods of the pressure plate (7) pass through the liquid storage chamber cover (10), the pressure rod hole (1-1-1) of the liquid storage chamber (1-1) and are fixed to the movable plate (4) in sequence, and a piston plate (11) is provided on the pressure rods of the pressure plate (7) in the two liquid storage chambers (1-1); A liquid storage box (8) is fixed on each side of the lower mold (1). The two liquid storage boxes (8) are connected to a liquid guide tube I (1-2) on one side of the liquid storage cavity (1-1) via a liquid guide tube III (8-1). An electronic valve (9) is provided on the liquid guide tube III (8-1). A liquid guide tube II (1-3) on the other side of the liquid storage cavity (1-1) communicates with the mold cavity (1-9) of the lower mold (1) via a nozzle (1-4). The liquid storage box (8) is opened or closed via the electronic valve (9) to achieve communication or closure with the liquid guide tube III (8-1), the liquid guide tube I (1-2), the liquid storage cavity (1-1), the liquid guide tube II (1-3) and the nozzle (1-4).

2. The ejection structure of an injection mold according to claim 1, characterized in that: The liquid storage box (8) is provided with a liquid adding hopper (8-2).

3. The ejection structure of an injection mold according to claim 1, characterized in that: Sealing rings (12) are respectively provided on the outer wall of the liquid storage chamber cover (10) and the inner wall of the chamber cover hole, and a sealing ring (12) is provided on the outer wall of the piston plate (11).

4. The ejection structure of an injection mold according to claim 1, characterized in that: A liquid storage cavity (1-1) is respectively provided in the mold bodies on both sides of the lower mold (1), and a liquid guide tube I (1-2) communicating with the two side surfaces of the lower mold (1) and a pressure rod hole (1-1-1) communicating with the inner cavity (1-7) are respectively provided horizontally at the lower ends of the two liquid storage cavities (1-1), and a liquid guide tube II (1-3) is respectively provided vertically in the mold bodies on one side of the two liquid storage cavities (1-1), one end of the liquid guide tube II (1-3) is communicated with the liquid storage cavity (1-1), and the other end of the liquid guide tube II (1-3) is communicated with the mold cavity (1-9) of the lower mold (1) through the nozzle (1-4), and the other end is communicated with the upper surface of the mold body of the lower mold (1), and a plug (1-5) is provided on the liquid guide tube II (1-3) on the upper surface of the mold body. The mold cavity (1-9) is provided with two top plate holes (1-1-2) communicating with the inner cavity (1-7); a lower mold bottom plate (1-6) is fixed on the raised walls on both sides of the bottom end of the lower mold (1); the lower mold bottom plate (1-6) and the bottom end surface of the lower mold (1) form the inner cavity (1-7); two limit rods (1-8) are spaced apart on the bottom end surface of the lower mold (1) in the inner cavity (1-7); and a sealing ring (12) is provided on the inner wall of the pressure rod hole (1-1-1).

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