Efficient cooling demolding device for injection molding of PET plastic bottle

Abstract

The utility model provides an efficient cooling demolding device for PET plastic bottle injection molding, and relates to the field of PET plastic bottle injection molding demolding, the efficient cooling demolding device comprises an injection molding machine table and a right injection mold, an electric sliding table is fixed on the upper surface of the injection molding machine table, the upper end of the electric sliding table is movably connected with a sliding support, a lifting screw rod is installed in an inner side groove of the sliding support, and the lifting screw rod is movably connected with the right injection mold. The surface of the lifting screw rod is connected with a fixing plate through a driving block, a double-end electric push rod is embedded in the inner side of the fixing plate, the front end and the rear end of the double-end electric push rod are connected with a rear clamping plate and a front clamping plate through connecting blocks correspondingly, and pressure sensing plates are arranged on the front surface of the rear clamping plate in a bilateral symmetry mode; air outlets are symmetrically formed in the rear surface of the front clamping plate, and a cold air pipe is connected to the front surface of the front clamping plate. The utility model solves the problem in the prior art that the demolding quality is influenced by local adhesion of the PET plastic bottle because cooling liquid entering and exiting from the water pipe in the mold is difficult to uniformly take away heat of the arc-shaped bottle body.

Description

Technical Field

[0001] This utility model relates to the field of injection molding demolding technology for PET plastic bottles, specifically to a high-efficiency cooling demolding device for injection molding of PET plastic bottles. Background Technology

[0002] PET plastic bottles, used for beverage packaging, are widely used not only for packaging carbonated drinks, drinking water, juice, enzyme drinks, and tea beverages, making them the most widely used beverage packaging today, but also for food, chemical, and pharmaceutical packaging, among many other fields. PET plastic bottles are produced by injection molding into a mold, followed by cooling and demolding. A search revealed existing technology (application number: CN202321046073.5) for a novel plastic bottle processing and demolding device, which describes "a device equipped with a water pump, water collection tank, inlet pipe, telescopic pipe, connecting pipe, outlet pipe, and water passage pipe, which, during the molding process,..." The water pump draws coolant from the water collection tank and delivers it to the water pipe. As the coolant passes through the water pipe, it rapidly cools the plastic bottle inside the mold cavity, thus accelerating the cooling efficiency. The cooled water flows back to the water collection tank through the outlet pipe, where a cooler further cools the liquid for subsequent use. This structure improves cooling efficiency and further enhances the demolding effect. However, in the existing technology, the coolant entering from the top and exiting from the bottom in the water pipe of the mold cannot evenly remove the heat from the curved bottle body, leading to localized adhesion of the PET plastic bottle and affecting the demolding quality. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a high-efficiency cooling and demolding device for injection molding of PET plastic bottles is provided. This device addresses the problem that in existing technologies, the cooling liquid entering from the top and exiting from the bottom of the water pipe in the mold cannot evenly remove the heat from the curved bottle body, leading to localized adhesion of the PET plastic bottle and affecting the demolding quality.

[0004] To achieve the above objectives, a high-efficiency cooling and demolding device for injection molding PET plastic bottles is provided, comprising: an injection molding machine base and a right injection mold, wherein the right injection mold is fixed on the inner right side of the injection molding machine base.

[0005] An electric slide is fixed on the upper surface of the injection molding machine platform. A sliding bracket is movably connected to the upper end of the electric slide. A lifting screw is installed in the inner groove of the sliding bracket. A fixed plate is connected to the surface of the lifting screw through a drive block. A double-headed electric push rod is embedded in the inner side of the fixed plate. The front and rear ends of the double-headed electric push rod are connected to a rear clamping plate and a front clamping plate respectively through connecting blocks. Pressure sensing plates are symmetrically arranged on the left and right sides of the front surface of the rear clamping plate. Air outlets are symmetrically arranged on the rear surface of the front clamping plate. A cold air pipe is connected to the front surface of the front clamping plate. The left side of the right injection mold is closely attached to the left injection mold.

[0006] Furthermore, the left side of the inner side of the injection molding machine is connected to a left injection mold via a hydraulic column, and both the left and right injection molds have mold cavities on their inner sides.

[0007] Furthermore, the upper and lower end faces of the left and right injection molds are connected to coolant inlet pipes and coolant outlet pipes, and cooling cavities are opened inside the left and right injection molds.

[0008] Furthermore, the upper and lower ends of the cooling channel are respectively connected to the coolant inlet pipe and the coolant outlet pipe; and the cooling channel is distributed around the side end of the mold cavity.

[0009] Furthermore, a motor is fixed inside the sliding bracket; and a lifting screw is shaft-connected to the upper end of the motor, and a drive block is fixed to the rear end face of the fixed plate.

[0010] Furthermore, the front clamping plate is located at the front end of the rear clamping plate, and connecting blocks are welded to the upper ends of both the rear clamping plate and the front clamping plate.

[0011] Furthermore, the front clamp is provided with an air supply channel, and the cold air duct is connected to the air outlet through the air supply channel.

[0012] The beneficial effects of this utility model are as follows: The high-efficiency cooling and demolding device for PET plastic bottle injection molding utilizes a front clamping plate, a rear clamping plate, a sliding bracket, an electric slide table, a double-headed electric push rod, and a lifting screw to form a demolding clamping mechanism. The front and rear clamping plates clamp the mouth and bottom of the partially demolded PET plastic bottle, while cold air is delivered into the PET plastic bottle through the air outlet on the surface of the front clamping plate. This allows the inner and outer sides of the PET plastic bottle that has not been demolded to be fully cooled by the cold air and coolant, facilitating the uniform cooling and shaping of the PET plastic bottle before complete demolding and removal. This enhances the cooling and demolding effect of the PET plastic bottle injection mold, facilitates efficient cooling and separation of the PET plastic bottle from the mold, prevents deformation and damage to the PET plastic bottle during forceful demolding, ensures the quality of PET plastic bottle injection molding production, and improves the demolding efficiency of the PET plastic bottle demolding device. Attached Figure Description

[0013] Figure 1 This is a top view of the efficient cooling and demolding device for injection molding PET plastic bottles according to an embodiment of the present invention.

[0014] Figure 2 This is a top cross-sectional view of the injection molding and demolding structure of a PET plastic bottle according to an embodiment of the present invention.

[0015] Figure 3 This is a frontal cross-sectional view of the left injection mold according to an embodiment of the present invention.

[0016] Figure 4This is a side view sectional view of the connection structure between the front clamping plate and the rear clamping plate in an embodiment of this utility model.

[0017] Figure 5 This is a three-dimensional structural diagram of the rear clamping plate according to an embodiment of the present utility model.

[0018] In the diagram: 1. Injection molding machine platform; 11. Hydraulic column; 12. Coolant inlet pipe; 13. Coolant outlet pipe; 2. Rear clamping plate; 21. Sliding bracket; 22. Electric slide table; 23. Fixed plate; 24. Double-headed electric push rod; 25. Lifting screw; 26. Drive block; 27. Motor; 28. Connecting block; 29. ​​Pressure sensing plate; 3. Front clamping plate; 31. Cooling air duct; 32. Air supply cavity; 33. Air outlet; 4. Left injection mold; 41. Cooling cavity; 5. Right injection mold; 51. Mold cavity. Detailed Implementation

[0019] Reference Figures 1 to 5 As shown, this utility model provides a high-efficiency cooling and demolding device for injection molding of PET plastic bottles, including: an injection molding machine base 1 and a right injection mold 5, wherein the right injection mold 5 is fixed on the inner right side of the injection molding machine base 1.

[0020] An electric slide table 22 is fixed on the upper surface of the injection molding machine base 1. A sliding bracket 21 is movably connected to the upper end of the electric slide table 22. A lifting screw 25 is installed in the inner groove of the sliding bracket 21. A fixed plate 23 is connected to the surface of the lifting screw 25 through a drive block 26. A double-headed electric push rod 24 is embedded in the inner side of the fixed plate 23. The front and rear ends of the double-headed electric push rod 24 are connected to the rear clamping plate 2 and the front clamping plate 3 respectively through connecting blocks 28. Pressure sensing plates 29 are symmetrically arranged on the left and right sides of the front surface of the rear clamping plate 2. Air outlets 33 are symmetrically arranged on the rear surface of the front clamping plate 3. A cold air pipe 31 is connected to the front surface of the front clamping plate 3. The left side of the right injection mold 5 is closely attached to the left injection mold 4.

[0021] First, the inner cavities of the closed injection molds 4 and 5 are cooled. When the left and right injection molds 4 and 5 are separated, and the PET plastic bottle remains inside the cavity of the left or right injection mold 5, the rotating lifting screw 25 lowers the rear clamping plate 2 and front clamping plate 3 to the level of the mold, and then moves them to the side of the left or right injection mold 5. The double-headed electric push rod 24 moves the rear clamping plate 2 and front clamping plate 3 towards the middle, so that the rear clamping plate 2 and front clamping plate 3 are respectively in contact with half of the bottom and the mouth of the PET plastic bottle. At this time, the pressure sensing plate 29 senses and controls the clamping plate. The clamping force of the plate on the PET plastic bottle, the air outlet 33 of the front clamping plate 3 delivers cold air to the bottle mouth, so that the inner and outer sides of the PET plastic bottle that has not been demolded are fully cooled by the cold air and coolant, so that the PET plastic bottle can be completely demolded after uniform cooling and shaping, which enhances the cooling and demolding effect of the PET plastic bottle injection mold, facilitates efficient cooling and separation of the PET plastic bottle in the mold, prevents deformation and damage of the PET plastic bottle due to strong demolding, ensures the quality of PET plastic bottle injection production, and allows the PET plastic bottle to be clamped and moved out of the cavity after cooling again, completing the demolding process of the PET plastic bottle.

[0022] In this embodiment, the left side of the inner side of the injection molding machine 1 is connected to the left injection mold 4 via a hydraulic column 11, and mold cavities 51 are opened on the inner sides of both the left injection mold 4 and the right injection mold 5.

[0023] In a preferred embodiment, the hydraulic column 11 is used to drive the left injection mold 4 and the right injection mold 5 to close or separate. When the hydraulic column 11 pulls the left injection mold 4 and the right injection mold 5 to separate, the cooled PET plastic bottle is located in the mold cavity 51 of one side of the injection mold. At this time, the PET plastic bottle in the mold cavity 51 is clamped by the demolding clamping mechanism composed of the rear clamping plate 2 and the front clamping plate 3. At the same time, cold air is sent into the mouth of the PET plastic bottle to facilitate the uniform cooling and shaping of the PET plastic bottle before complete demolding and removal. This enhances the cooling and demolding effect of the PET plastic bottle injection mold and facilitates efficient cooling and separation of the PET plastic bottle in the mold.

[0024] In this embodiment, coolant inlet pipes 12 and coolant outlet pipes 13 are connected to the upper and lower end faces of the left injection mold 4 and the right injection mold 5, respectively. Cooling channels 41 are formed inside the left injection mold 4 and the right injection mold 5. The upper and lower ends of the cooling channels 41 are connected to the coolant inlet pipes 12 and the coolant outlet pipes 13, respectively; and the cooling channels 41 are distributed around the side of the mold cavity 51.

[0025] In a preferred embodiment, the coolant inlet pipe 12 and coolant outlet pipe 13 allow coolant to flow in and out of the cooling channel 41, cooling and shaping the PET plastic bottles injected into the cavities of the left injection mold 4 and the right injection mold 5, facilitating subsequent demolding and removal of the PET plastic bottles. The surrounding cooling channel 41 effectively removes heat from the PET plastic bottles injected into the mold cavity 51, improving the cooling and shaping effect of the PET plastic bottles during injection molding.

[0026] In this embodiment, a motor 27 is fixed inside the sliding bracket 21; and a lifting screw 25 is shaft-connected to the upper end of the motor 27, and a drive block 26 is fixed to the rear end face of the fixing plate 23. The front clamping plate 3 is located at the front end of the rear clamping plate 2, and a connecting block 28 is welded to the upper end of both the rear clamping plate 2 and the front clamping plate 3.

[0027] In a preferred embodiment, the motor 27 drives the lifting screw 25 to rotate, so that the drive block 26 converts the rotational motion of the lifting screw 25 into linear motion, thereby driving the rear clamping plate 2 and the front clamping plate 3 at the lower end of the fixed plate 23 to move up and down to the injection mold. The rear clamping plate 2 and the front clamping plate 3 are driven by the double-headed electric push rod 24 to contact and clamp the bottom and mouth of the PET plastic bottle, which facilitates mechanical demolding.

[0028] In this embodiment, the front clamp 3 is provided with an air supply duct 32, and the cold air pipe 31 is connected to the air outlet 33 through the air supply duct 32.

[0029] As a preferred implementation, the cold air duct 31 delivers cold air into the PET plastic bottle from the bottle mouth that is in contact with the front clamping plate 3 through the air supply channel 32 and the air outlet 33. This cools and shapes the side of the PET plastic bottle that has not detached from the mold cavity, making it easier to clamp the PET plastic bottle into the mold at the detachment point. This prevents the PET plastic bottle from being deformed or damaged during strong demolding, and ensures the quality of PET plastic bottle injection molding production.

[0030] This utility model provides a high-efficiency cooling and demolding device for PET plastic bottle injection molding. It effectively solves the problem in existing technologies where the cooling liquid entering from the top and exiting from the bottom of the water pipe in the mold cannot evenly remove heat from the curved bottle body, leading to localized adhesion of the PET plastic bottle and affecting demolding quality. This device facilitates uniform cooling and shaping of the PET plastic bottle before complete demolding and removal, enhancing the cooling and demolding effect of the PET plastic bottle injection mold. It enables efficient cooling and separation of the PET plastic bottle from the mold, preventing deformation and damage during forceful demolding, ensuring the quality of PET plastic bottle injection molding production, and improving the demolding efficiency of the PET plastic bottle demolding device. This device is suitable for high-efficiency cooling and demolding applications in PET plastic bottle injection molding.

Claims

1. A high-efficiency cooling and demolding device for injection molding PET plastic bottles, comprising: An injection molding machine (1) is provided, wherein a right injection mold (5) is fixed on the inner right side of the injection molding machine (1), characterized in that: An electric slide (22) is fixed on the upper surface of the injection molding machine (1). A sliding bracket (21) is movably connected to the upper end of the electric slide (22). A lifting screw (25) is installed in the inner groove of the sliding bracket (21). A fixed plate (23) is connected to the surface of the lifting screw (25) through a drive block (26). A double-headed electric push rod (24) is embedded in the inner side of the fixed plate (23). The front and rear ends of the double-headed electric push rod (24) are respectively connected to a rear clamping plate (2) and a front clamping plate (3) through a connecting block (28). A pressure sensing plate (29) is symmetrically arranged on the left and right sides of the front surface of the rear clamping plate (2). An air outlet (33) is symmetrically arranged on the rear surface of the front clamping plate (3). A cold air pipe (31) is connected to the front surface of the front clamping plate (3). The left side of the right injection mold (5) is closely attached to the left injection mold (4).

2. The high-efficiency cooling and demolding device for injection molding of PET plastic bottles according to claim 1, characterized in that, The left side of the injection molding machine (1) is connected to the left injection mold (4) via a hydraulic column (11). Both the left injection mold (4) and the right injection mold (5) have mold cavities (51) on their inner sides.

3. The high-efficiency cooling and demolding device for injection molding of PET plastic bottles according to claim 2, characterized in that, The left injection mold (4) and the right injection mold (5) are connected to coolant inlet pipe (12) and coolant outlet pipe (13) on their upper and lower ends, and cooling cavities (41) are opened inside the left injection mold (4) and the right injection mold (5).

4. The high-efficiency cooling and demolding device for injection molding of PET plastic bottles according to claim 3, characterized in that, The upper and lower ends of the cooling channel (41) are connected to the coolant inlet pipe (12) and the coolant outlet pipe (13) respectively; and the cooling channel (41) is distributed around the side of the mold cavity (51).

5. The high-efficiency cooling and demolding device for injection molding of PET plastic bottles according to claim 1, characterized in that, The sliding bracket (21) has a motor (27) fixed inside; and the upper end of the motor (27) is connected to a lifting screw (25), and the rear end face of the fixing plate (23) is fixed with a drive block (26).

6. The high-efficiency cooling and demolding device for injection molding of PET plastic bottles according to claim 1, characterized in that, The front clamping plate (3) is located at the front end of the rear clamping plate (2), and the upper ends of the rear clamping plate (2) and the front clamping plate (3) are both welded with connecting blocks (28).

7. The high-efficiency cooling and demolding device for injection molding of PET plastic bottles according to claim 1, characterized in that, The front clamp (3) is provided with an air supply duct (32), and the cold air pipe (31) is connected to the air outlet (33) through the air supply duct (32).

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