A molding die for plastic container production

Abstract

The utility model discloses a kind of forming mould for plastic container production, including mould body and liquid cooling pipeline;The mould body includes first side mould and second side mould, two side moulds inside respectively install liquid cooling pipeline, and are all equipped with blow molding cavity, wherein first side mould and second side mould outer wall upper and lower sides are connected with telescopic pneumatic cylinder;The fixed end of the telescopic pneumatic cylinder is fixedly connected with cylinder frame, and movable end connects the outer wall of first side mould or second side mould, wherein cylinder frame is fixed with link plate, and the blow molding cavity of second side mould is also embedded with push plate frame, and push plate frame is connected with corresponding cylinder frame. The utility model realizes fast and even cooling by liquid cooling pipeline, improves setting efficiency;Meanwhile, push plate frame is driven using telescopic pneumatic cylinder, realizes demolding automation, effectively solves the problem of insufficient cooling of existing mould, demolding difficulty, dependence on manual, improves production efficiency, reduces labor cost, improves the overall automation level and stability of edible oil bucket production.

Description

Technical Field

[0001] This utility model relates to the field of mold technology for producing edible oil drums, specifically a molding mold for producing plastic containers. Background Technology

[0002] Edible oil, also known as cooking oil, refers to animal or vegetable fats used in food production. It is liquid at room temperature. Currently, edible oil drums are important containers for ensuring the quality of oil and extending its shelf life. Their material selection, structural design, and performance testing must strictly comply with food safety standards. Common packaging drums are mostly made of PET material. The production of these edible oil packaging drums mainly uses extrusion blow molding molds. Their structure, materials, and process design must meet the high sealing, oil resistance, and hygiene requirements of food containers.

[0003] Existing blow molding molds are mainly used in conjunction with extrusion blow molding processes to produce oil drums. First, the raw material is heated and melted, and then a tubular preform is formed through a screw extruder. The preform is then inserted into the middle of two halves of the mold. After the two mold halves are closed, compressed air is injected through a blowpipe at the top, causing the preform to expand and fit against the mold cavity wall to form the drum body. After the mold is cooled and shaped by water, it is opened, and the tail material and flash are removed to obtain a complete oil drum.

[0004] After the blow molding of the oil drum is completed, the above-mentioned blow molding mold is generally cooled by water channels opened in the mold when it is removed to ensure that the drum body is shaped and facilitates subsequent mold opening and removal. However, during the production process, due to insufficient cooling of the mold, there is a phenomenon that the drum body cannot be discharged after the mold is opened. At this time, manual assistance is required to remove the drum body, which leads to reduced efficiency in the production process and consumes manpower for manual assistance. To address this, we propose a molding mold for the production of plastic containers. Utility Model Content

[0005] To address the shortcomings of existing blow molding molds, such as insufficient cooling leading to difficult demolding and low efficiency of manual demolding, this utility model provides a production molding mold that is efficient and facilitates the demolding and removal of plastic containers after molding.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A molding die for producing plastic containers includes a die body and liquid cooling pipes. The die body includes a first side die, and second side dies are symmetrically distributed on the inner wall of one side of the first side die. Liquid cooling pipes are installed on the inner sides of the first and second side dies respectively, and blow molding cavities are provided on opposite sides. Telescopic cylinders are connected to the upper and lower sides of the outer walls of the first and second side dies. A cylinder frame is fixedly connected to the fixed end of the telescopic cylinder, and the movable end is connected to the outer wall of the first or second side die. A connecting plate is fixed to the outer wall of the cylinder frame, and a push plate frame is embedded in the center of the inner wall of the blow molding cavity of the second side die. One side of the push plate frame extends out of the second side die and connects to the corresponding cylinder frame.

[0007] Furthermore, the liquid cooling pipeline includes a liquid cooling arc tube, which passes through the inside of the first or second side mold and is symmetrically distributed along both sides of the blow molding cavity. A flow pipe is fixed to the upper and lower sides of the liquid cooling arc tube, and connecting pipes are fixed to both ends. A secondary arc tube is connected in series at one end of each flow pipe. A connector is fixed to one end of each connecting pipe. The connector at one end of the liquid cooling arc tube is connected to the coolant, while the connector at the other end assists in the discharge of the coolant. After entering the cooling arc tube, the coolant connects to the secondary arc tube through the flow pipe, achieving continuous circulation of the coolant. The connector is used to connect to an external cooling system. The overall structure is reasonable, which can accelerate the shaping speed of the barrel, achieve rapid and uniform cooling of the mold, and improve demolding efficiency.

[0008] Furthermore, the secondary arc tubes are connected to the liquid-cooled arc tubes via cross-flow pipes, and the secondary arc tubes and liquid-cooled arc tubes are arranged at equal intervals along the interior of the first and second side molds. The secondary arc tubes are connected to the liquid-cooled arc tubes via cross-flow pipes, allowing the coolant to circulate in the equally spaced pipes, achieving uniform heat dissipation. The equally spaced cooling pipes also improve the uniformity of temperature control inside the mold and enhance cooling efficiency.

[0009] Furthermore, the first side mold has connecting holes distributed on both sides of the blow molding cavity, and the second side mold has corresponding insert pins at the positions of the connecting holes. When the mold closes, the insert pins on the second side mold are inserted into the connecting holes of the first side mold to achieve precise positioning. This mechanism can improve the mold closing accuracy and stability, ensure uniform molding, improve product quality, and reduce the scrap rate.

[0010] Furthermore, the connecting plate has threaded holes distributed around its outer walls, with screws threaded into these holes. The screws pass through the threaded holes and are then fixedly connected to the outer wall of the cylinder frame. By screwing the connecting plate through the threaded holes and tightening it to the outer wall of the cylinder frame, the mold assembly can be quickly installed and connected. The overall structure is simple, the connection is robust, improving mold assembly efficiency and stability, and facilitating maintenance and component replacement.

[0011] Furthermore, the push plate frame is embedded along the inner wall of the second side mold, and a push rod is provided on the outer side of the push plate frame. After the push rod passes through the second side mold, it is fixedly connected to the inner wall of the cylinder frame. The push plate frame is embedded and installed along the inner wall of the second side mold, and its outer side is fixedly connected to the cylinder frame through the push rod. As the telescopic cylinder moves, its relative position with the second side mold changes, thereby completing the demolding action.

[0012] Furthermore, the push plate frame matches the arc shape of the inner wall of the blow molding cavity, and the push plate frame slides inside the second side mold via a push rod. The matching arc shape of the push plate frame with the inner wall of the blow molding cavity, and the sliding of the push rod inside the second side mold, achieves precise guidance and fit, improving the fit and smoothness during demolding, reducing frictional resistance, ensuring smooth ejection of the barrel, and improving demolding efficiency and product integrity.

[0013] How to use this utility model: When using this molding die, the telescopic cylinder on the outer wall of the first side mold is first driven. The movable end of the telescopic cylinder pushes the first side mold inward, so that the first side mold fits into the blow molding cavity of the second side mold. At this time, the movable ends of the telescopic cylinders of the first and second side molds are both extended. Then, the raw material is heated and melted, and a tubular preform is formed through a screw extruder. At this time, the preform hangs into the middle of the first and second side molds and aligns with the blow molding cavity. Then, compressed air is injected into the top of the blow pipe, causing the preform in the blow molding cavity to expand and fit into the inner wall of the blow molding cavity to form the barrel body. Then, coolant is injected into the liquid cooling pipeline to circulate and dissipate heat in the blow molding cavity. After the mold cools down, the barrel body is shaped and the mold is opened. During the mold opening process, the telescopic cylinders of the first and second side molds are both driven. The movable ends of the telescopic cylinders pull the first and second side molds outward respectively, while the push plate frame remains stationary. As the second side mold moves outward, the formed barrel body is ejected, completing the discharge of the barrel body. Then, the tail material and flash are removed to obtain a complete oil barrel.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. This utility model achieves rapid and uniform cooling through liquid cooling pipelines, improving shaping efficiency; at the same time, it utilizes telescopic cylinders to drive the push plate frame, realizing automated demolding, effectively solving the problems of insufficient cooling, difficult demolding, and reliance on manual labor in existing molds, thereby improving production efficiency, reducing labor costs, and enhancing the overall automation level and stability of edible oil drum production.

[0015] 2. This utility model achieves coolant circulation by equidistantly arranging liquid-cooled arc tubes and auxiliary arc tubes, in conjunction with a flow pipe and connector, thereby improving cooling uniformity and efficiency and accelerating barrel shaping. When the mold closes, the insertion pins and connecting holes are used to achieve precise positioning, improve closing stability and molding quality, and effectively reduce the scrap rate.

[0016] 3. This utility model achieves rapid installation and secure connection of mold components through the cooperation of screws and threaded holes, improving assembly efficiency and stability; the push plate frame is embedded in the second side mold, and works with the push rod to achieve synchronous movement and precise guidance, ensuring smooth demolding, reducing frictional resistance, and improving demolding efficiency and product integrity. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the main body of this utility model.

[0018] Figure 2 This is a three-dimensional structural diagram of the second side mold of this utility model.

[0019] Figure 3 This is a side view of the internal structure of the second side mold of this utility model.

[0020] Figure 4 This is a top view of the internal structure of the second side mold of this utility model.

[0021] Figure 5 This is a three-dimensional structural diagram of the liquid cooling pipeline of this utility model.

[0022] In the diagram: 1-Mold body, 101-First side mold, 102-Telescopic cylinder, 103-Cylinder frame, 104-Connecting plate, 105-Threaded hole, 106-Second side mold, 107-Blow molding cavity, 108-Push plate frame, 109-Push rod, 110-Insertion stake, 2-Liquid cooling pipeline, 201-Liquid cooling arc pipe, 202-Connecting pipe, 203-Connecting head, 204-Flow pipe, 205-Secondary arc pipe. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Example 1: A molding die for producing plastic containers includes a die body 1 and liquid cooling pipes 2. The die body 1 includes a first side die 101, and second side dies 106 are symmetrically distributed on the inner wall of one side of the first side die 101. Liquid cooling pipes 2 are installed on the inner sides of the first side die 101 and the second side die 106 respectively. A blow molding cavity 107 is provided on the opposite side. Telescopic cylinders 102 are connected to the upper and lower sides of the outer walls of the first side die 101 and the second side die 106. A cylinder frame 103 is fixedly connected to the fixed end of the telescopic cylinder 102, and the movable end is connected to the outer wall of the first side die 101 or the second side die 106. A connecting plate 104 is fixed to the outer wall of the cylinder frame 103. A push plate frame 108 is also embedded in the center of the inner wall of the blow molding cavity 107 of the second side die 106. One side of the push plate frame 108 extends out of the second side die 106 and is connected to the corresponding cylinder frame 103.

[0025] The first side mold 101 and the second side mold 106 are fixedly installed on the ground or a workbench, respectively. In use, the telescopic cylinder 102 on the outer wall of the first side mold 101 is first driven. The movable end of the telescopic cylinder 102 pushes the first side mold 101 inward, so that the first side mold 101 fits against the blow molding cavity 107 of the second side mold 106. At this time, the movable ends of the telescopic cylinders 102 of both the first and second side molds are extended. Then, the raw material is heated and melted, and a tubular preform is formed through a screw extruder. The preform then hangs between the first and second side molds 101 and aligns with the blow molding cavity 107. Finally, a blowpipe is inserted at the top to inject... Compressed air is introduced to expand the preform in the blow molding cavity 107 and conform it to the inner wall of the blow molding cavity 107 to form the barrel body. Then, coolant is injected into the liquid cooling pipe 2 to circulate and dissipate heat in the blow molding cavity 107. After the mold cools down, the barrel body is shaped and the mold is opened. During the mold opening process, the telescopic cylinders 102 of the first side mold 101 and the second side mold 106 are both driven. The moving ends of the telescopic cylinders 102 pull the first side mold 101 and the second side mold 106 outward respectively. At the same time, the push plate frame 108 remains stationary. While the second side mold 106 moves outward, the formed barrel body is pushed out to complete the discharge of the barrel body. Then, the tail material and flash are removed to obtain a complete oil barrel.

[0026] Example 2: The difference from Example 1 is that the liquid cooling pipeline 2 includes a liquid cooling arc pipe 201, which passes through the first side mold 101 or the second side mold 106. The liquid cooling arc pipe 201 is symmetrically distributed along both sides of the blow molding cavity 107. A flow pipe 204 is fixed to the upper and lower sides of the liquid cooling arc pipe 201, and a connecting pipe 202 is fixed to both ends. A secondary arc pipe 205 is connected in series at one end of the flow pipe 204. A connector 203 is fixed to one end of the connecting pipe 202. The connector 203 at one end of the liquid cooling arc pipe 201 is connected to the coolant, while the connector 203 at the other end assists in the discharge of the coolant. After entering the cooling arc pipe 201, the coolant is connected to the secondary arc pipe 205 through the flow pipe 204, achieving continuous circulation of the coolant. The connector 203 is used to connect to an external cooling system. The overall structure is reasonable, which can accelerate the shaping speed of the barrel, achieve rapid and uniform cooling of the mold, and improve demolding efficiency.

[0027] The first side mold 101 has connecting holes on both sides of the blow molding cavity 107, and the second side mold 106 has corresponding insert pins 110 at the positions of the connecting holes. When the mold is closed, the insert pins 110 on the second side mold 106 are inserted into the connecting holes of the first side mold 101 to achieve precise positioning. This mechanism can improve the mold closing accuracy and stability, ensure uniform molding, improve product quality, and reduce the scrap rate.

[0028] The push plate frame 108 is embedded along the inner wall of the second side mold 106, and a push rod 109 is provided on the outer side of the push plate frame 108. The push rod 109 passes through the second side mold 106 and is fixedly connected to the inner wall of the cylinder frame 103. The push plate frame 109 is embedded along the inner wall of the second side mold 106, and its outer side is fixedly connected to the cylinder frame 103 through the push rod 109. As the telescopic cylinder 102 moves, its relative position with the second side mold 106 changes, thereby completing the demolding action.

[0029] Example 3: The difference from Example 2 is that the secondary arc tubes 205 are connected to the liquid-cooled arc tube 201 via a flow pipe 204, and the secondary arc tubes 205 and the liquid-cooled arc tube 201 are arranged at equal intervals along the interior of the first side mold 101 and the second side mold 106. The secondary arc tubes 205 are connected to the liquid-cooled arc tube 101 via the flow pipe 204, allowing the coolant to circulate in the equally spaced pipes, achieving uniform heat dissipation. Furthermore, the equally spaced cooling pipes improve the uniformity of temperature control inside the mold and enhance cooling efficiency.

[0030] The connecting plate 104 has threaded holes 105 distributed around its outer walls. Screws are threaded into the threaded holes 105 and are fixedly connected to the outer wall of the cylinder frame 103 after passing through the threaded holes 105. By screwing the screws through the threaded holes 105 on the connecting plate and tightening them to the outer wall of the cylinder frame 103, the mold assembly can be quickly installed and connected. The overall structure is simple, the connection is firm, the mold assembly efficiency and stability are improved, and maintenance and replacement of parts are convenient.

[0031] The push plate frame 108 matches the arc shape of the inner wall of the blow molding cavity 107, and the push plate frame 108 slides inside the second side mold 106 via the push rod 109. The matching arc shape of the push plate frame 108 with the inner wall of the blow molding cavity 107, and the sliding of the push rod 109 inside the second side mold 106, achieves precise guidance and fit, improving the fit and smoothness during demolding, reducing frictional resistance, ensuring smooth ejection of the barrel, and improving demolding efficiency and product integrity.

[0032] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A molding die for producing plastic containers, characterized in that: The mold includes a mold body (1) and liquid cooling pipes (2); the mold body (1) includes a first side mold (101), and a second side mold (106) is symmetrically distributed on one inner wall of the first side mold (101). Liquid cooling pipes (2) are installed on the inner sides of the first side mold (101) and the second side mold (106), and a blow molding cavity (107) is provided on the opposite side. Telescopic cylinders (102) are connected to the upper and lower sides of the outer walls of the first side mold (101) and the second side mold (106). The fixed end of the telescopic cylinder (102) is fixedly connected to a cylinder frame (103), and the movable end is connected to the outer wall of the first side mold (101) or the second side mold (106). The outer wall of the cylinder frame (103) is fixed with a connecting plate (104), and a push plate frame (108) is also embedded in the center of the inner wall of the blow molding cavity (107) of the second side mold (106). One side of the push plate frame (108) passes through the second side mold (106) and connects to the corresponding cylinder frame (103).

2. The molding die for producing plastic containers as described in claim 1, characterized in that: The liquid cooling pipeline (2) includes a liquid cooling arc tube (201), which is inserted inside the first side mold (101) or the second side mold (106). The liquid cooling arc tube (201) is symmetrically distributed along both sides of the blow molding cavity (107). A flow pipe (204) is fixed on the upper and lower sides of the liquid cooling arc tube (201), and a connecting pipe (202) is fixed at both ends. A secondary arc tube (205) is connected in series at one end of the flow pipe (204). A connector (203) is fixed at one end of the connecting pipe (202).

3. The molding die for producing plastic containers as described in claim 2, characterized in that: The secondary arc tubes (205) are connected to the liquid-cooled arc tube (201) through a cross-flow tube (204), and the secondary arc tubes (205) and the liquid-cooled arc tube (201) are arranged at equal intervals along the inside of the first side mold (101) and the second side mold (106).

4. A molding die for producing plastic containers as described in claim 1 or 2, characterized in that: The first side mold (101) has connecting holes distributed on both sides of the blow molding cavity (107), and the second side mold (106) has a matching insert (110) at the position of the connecting hole.

5. The molding die for producing plastic containers as described in claim 1, characterized in that: The connecting plate (104) has threaded holes (105) distributed on its outer walls. Screws are threaded inside the threaded holes (105) and are fixedly connected to the outer wall of the cylinder frame (103) after passing through the threaded holes (105).

6. The molding die for producing plastic containers as described in claim 1, characterized in that: The push plate frame (108) is embedded along the inner wall of the second side mold (106), and a push rod (109) is provided on the outer side of the push plate frame (108). The push rod (109) passes through the second side mold (106) and is fixedly connected to the inner wall of the cylinder frame (103).

7. The molding die for producing plastic containers as described in claim 6, characterized in that: The push plate frame (108) matches the arc shape of the inner wall of the blow molding cavity (107), and the push plate frame (108) slides in conjunction with the inside of the second side mold (106) through the push rod (109).

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