EPP (Expanded Polypropylene) forming mold with external air cylinder and high production efficiency

Abstract

The utility model relates to the technical field of EPP (Expanded Polypropylene) forming molds, in particular to an EPP forming mold with an external air cylinder and efficient production, which comprises a mold main body and an external air cylinder system positioned on the outer side of the mold main body, the die body comprises a female die, a male die and a back plate. A die cavity is formed after the female die and the male die are closed, and the female die and the male die are connected through a plug pin after the die is closed; a plurality of telescopic rods are evenly arranged between the female die and the back plate, the external air cylinder system comprises a plurality of air cylinders, piston rods of the air cylinders penetrate through the side wall of the die body to be connected with plug pins, and the piston rods are in sliding fit with the side wall of the die body. According to the mold, the air cylinder is externally arranged to give the space inside the mold for arranging products, the utilization rate of the space inside the mold is increased, the production efficiency is improved, and the demolding efficiency is improved by arranging the back plate and the telescopic rod.

Description

Technical Field

[0001] This utility model relates to the field of EPP molding die technology, specifically to an EPP molding die with an externally mounted cylinder and high-efficiency production. Background Technology

[0002] EPP (expanded polypropylene) is a high-performance foamed plastic material with excellent heat resistance, mechanical strength, and environmental friendliness, widely used in automotive, packaging, construction, and toy industries. In EPP processing, molding dies are indispensable specialized tools. By injecting heated molten plastic into the mold cavity and allowing it to cool and harden under specific time and pressure, the desired plastic product shape is obtained. It is particularly suitable for mass production of products with complex geometries and high precision requirements. In EPP molding dies, the die size is fixed. When designing the die, it's crucial to consider accommodating as many products as possible within a limited space. If cylinders are added to the die, it means increasing the space required for arrangement, reducing the space utilization rate of the EPP molding die. Utility Model Content

[0003] The purpose of this invention is to provide an EPP molding die with an externally mounted cylinder and high-efficiency production, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An EPP molding die with an externally mounted cylinder and high-efficiency production includes a die body and an externally mounted cylinder system located outside the die body.

[0006] The mold body includes a concave mold, a convex mold, and a back plate; after the concave mold and the convex mold are closed, a mold cavity is formed, and the concave mold and the convex mold are connected by a pin after the mold is closed;

[0007] A number of telescopic rods are evenly arranged between the die and the back plate. One end of each telescopic rod is fixedly connected to the die, and the other end is fixedly connected to the back plate.

[0008] The external cylinder system includes multiple cylinders, and the piston rod of the cylinder passes through the side wall of the mold body and is connected to the pin. The piston rod and the side wall of the mold body are slidably engaged.

[0009] Furthermore, the cylinder bodies of the multiple cylinders are respectively fixed to the left and right sides of the mold body by a detachable frame.

[0010] Furthermore, it also includes a control module, which includes a temperature sensor and a controller. The temperature sensor, cylinder and controller are electrically connected, and the temperature sensor is embedded in the surface of the mold cavity.

[0011] Furthermore, the mold body is provided with cooling channels, which are connected to a cooling system. The cooling system includes an automatic regulating valve and cooling water pipes. The cooling water pipes include an inlet pipe and an outlet pipe. The outer ends of the inlet pipe and the outlet pipe pass through the back plate and are respectively connected to an external circulation system, and the inner ends are respectively connected to the inlet and outlet of the cooling channels.

[0012] Furthermore, the paths of the cooling channels are distributed in a serpentine pattern along the mold cavity contour.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model presents an EPP molding die with an externally mounted cylinder that achieves high-efficiency production. By optimizing and improving the external cylinder design, the internal space of the mold is made available for product arrangement, thereby increasing the utilization rate of the internal space. This can double the output of molded products, improve production efficiency, and reduce operating costs. Furthermore, the addition of a back plate and telescopic rod enhances demolding efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a structural diagram of the concave die in this utility model;

[0017] Figure 3 This is a structural diagram of the punch in this utility model;

[0018] Figure 4 This is a structural diagram of the cylinder in this utility model.

[0019] In the diagram: 1. Mold body; 11. Cavity; 12. Punch; 13. Back plate; 14. Mold cavity; 2. Cylinder system; 21. Cylinder; 211. Cylinder body; 212. Piston rod; 22. Frame; 3. Telescopic rod; 4. Exhaust port; 5. Cooling system; 51. Automatic regulating valve; 52. Cooling water channel; 521. Water inlet pipe; 522. Water outlet pipe. Detailed Implementation

[0020] 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.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" means two or more, unless otherwise explicitly specified.

[0024] Please see Figures 1-4 As shown, the present invention provides a technical solution: an EPP molding die with an external cylinder and high-efficiency production, comprising a die body 1 and an external cylinder system 2 located outside the die body 1. The die body 1 includes a concave die 11, a convex die 12 and a back plate 13. After the concave die 11 and the convex die 12 are closed, a mold cavity 14 is formed. The concave die 11 and the convex die 12 are connected by a pin. The back plate 13 is disposed above the concave die 11 and is fixedly connected to the convex die 12 by several detachable brackets.

[0025] Several telescopic rods 3 are evenly arranged between the die cavity 11 and the back plate 13. One end of each telescopic rod 3 is fixedly connected to the die cavity 11, and the other end is fixedly connected to the back plate 13. During mold opening, the telescopic rods 3 initially separate the die cavity 11 and the punch 12 in a direction perpendicular to the back plate 13. Finally, the detachable bracket is removed to complete the separation. The external cylinder system 2 includes multiple cylinders 21, which are fixed to the left and right sides of the mold body 1 by a detachable frame 22. The multiple cylinders 21 are controlled by a control module, which can automatically control the opening and closing of the cylinders 21 to achieve automated operation of the equipment.

[0026] In this embodiment, the cylinder 21 includes a cylinder body 211 and a piston rod 212. The cylinder body 211 is fixed to the side wall of the mold body 1 by a detachable bracket 22. The piston rod 212 of the cylinder 21 passes through the side wall of the mold body 1 and is connected to a pin. The piston rod 212 and the side wall of the mold body 1 are slidably engaged.

[0027] When the conditions for mold opening are met, the control module activates cylinder 21. At this time, the piston rod 212 of cylinder 21 pulls out the pin between the die 11 and the punch 12. The die 11 is provided with an exhaust hole 4 communicating with the mold cavity 14 to discharge the gas inside the mold. The mold body 1 is provided with cooling channels, which are connected to a cooling system 5 for rapid cooling of the mold. The cooling system 5 includes an automatic regulating valve 51 and a cooling water pipe 52. The cooling water pipe 52 includes an inlet pipe 521 and an outlet pipe 522. The outer ends of the inlet pipe 521 and the outlet pipe 522 pass through the back plate 13 and are respectively connected to the external circulation system, and the inner ends are respectively connected to the inlet and outlet of the cooling channels. In order to improve the cooling effect, the path of the cooling channels is distributed in a serpentine manner along the contour of the mold cavity 14, and the movement trajectory of the cooling water pipe 52 and the telescopic rod 3 are arranged in a non-overlapping manner on the projection plane.

[0028] In this embodiment, the control module includes a temperature sensor and a controller. The temperature sensor, cylinder 21 and controller are electrically connected. The temperature sensor is embedded in the surface of the mold cavity 14. When the temperature of the mold cavity 14 is detected to be lower than a set threshold, the controller synchronously triggers the cylinder 21 to pull out the pin.

[0029] The specific steps are as follows:

[0030] Mold closing and injection: First, the mold is preheated. When the temperature reaches the melting point of EPP, heating is stopped, and the concave mold 11 and convex mold 12 are closed. Then, EPP granules are injected into the mold cavity 14. After the granules are injected into the mold cavity 14, the gas in the mold cavity 14 will be discharged through the vent hole 4 to avoid product air bubbles.

[0031] Heating and molding: After the granules are injected into the mold cavity 14, the mold is heated. When the mold temperature reaches the melting point of the EPP material, steam is introduced to make the EPP foam and expand.

[0032] Cooling and Ejection: After steam is introduced, the temperature inside the mold is too high for demolding. To ensure smooth demolding, the internal temperature of the mold must be lowered. At this time, the cooling system 5 starts working to cool the mold and reduce its temperature. When the temperature sensor detects that the temperature of the mold cavity 14 is lower than the demolding temperature, the external cylinder 21 is activated. The piston rod 212 of the cylinder 21 pulls out the pin, and then the telescopic rod 3 retracts to initially separate the concave mold 11 and the convex mold 12. Finally, the detachable bracket is removed to complete the separation, and the product is automatically ejected from the mold cavity 14. Then, a designated person is responsible for sorting the products onto the shelf, arranging them neatly, and placing them in the drying room for drying according to different models.

[0033] In this embodiment, an EPP molding die with an externally mounted cylinder and high-efficiency production is used. This utility model adopts an externally mounted cylinder, which improves the utilization efficiency of the die and reduces production costs.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An EPP molding die with an externally mounted cylinder and high-efficiency production, characterized in that: Includes the mold body and an external cylinder system located on the outside of the mold body; The mold body includes a concave mold, a convex mold, and a back plate; after the concave mold and the convex mold are closed, a mold cavity is formed, and the concave mold and the convex mold are connected by a pin after the mold is closed; A number of telescopic rods are evenly arranged between the die and the back plate. One end of each telescopic rod is fixedly connected to the die, and the other end is fixedly connected to the back plate. The external cylinder system includes multiple cylinders, and the piston rod of the cylinder passes through the side wall of the mold body and is connected to the pin. The piston rod and the side wall of the mold body are slidably engaged.

2. The EPP molding die with an externally mounted cylinder and high-efficiency production according to claim 1, characterized in that: The cylinder bodies of multiple cylinders are fixed to the left and right sides of the mold body by a detachable frame.

3. The EPP molding die with an externally mounted cylinder and high-efficiency production according to claim 1, characterized in that: It also includes a control module, which contains a temperature sensor and a controller. The temperature sensor, cylinder and controller are electrically connected, and the temperature sensor is embedded in the surface of the mold cavity.

4. The EPP molding die with an externally mounted cylinder and high-efficiency production according to claim 1, characterized in that: The mold body is provided with cooling channels, which are connected to a cooling system. The cooling system includes an automatic regulating valve and cooling water pipes. The cooling water pipes include an inlet pipe and an outlet pipe. The outer ends of the inlet pipe and the outlet pipe pass through the back plate and are respectively connected to the external circulation system, and the inner ends are respectively connected to the inlet and outlet of the cooling channels.

5. The EPP molding die with an externally mounted cylinder and high-efficiency production according to claim 4, characterized in that: The cooling channels are distributed in a serpentine pattern along the mold cavity contour.

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