Heating mechanism for injection molding of PET plastic bottle blank

Abstract

The utility model belongs to the technical field of plastic injection molding, and particularly relates to a heating mechanism for injection molding of a PET (Polyethylene Terephthalate) plastic bottle blank, which comprises two half molds, a sensor, a driver, a heater and a cooler, and is characterized in that the sensor is positioned on one side of an injection molding opening of each half mold, the driver is positioned in the half mold, and the heater is positioned on the other side of the injection molding opening of each half mold. The sensor and the driver are connected through a connecting line, and heat exchange grooves are formed in the inner sides of the two half molds; when the circulating oil with higher temperature and the molten plastic flow simultaneously and reversely, the circulating oil can be complementary with the flowing temperature of the plastic, so that the uniformity of the temperature of the plastic in the flowing process is improved, the condition that the quality of a bottle preform is reduced due to the fact that the plastic is solidified before flowing to the final position due to uneven temperature is avoided, and the quality of the bottle preform is improved. And through the process that the circulating oil flows from the oil storage bin II, such as the oil storage bin I, the circulating oil with lower temperature can flow in the circulating oil, so that the cooling speed of the plastic is favorably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic injection molding, and in particular relates to a heating mechanism for injection molding of PET plastic bottle embryos. Background Art

[0002] PET plastic preform injection molding is the process of processing PET plastic raw materials into preforms through an injection molding machine. During the injection molding process, PET plastic particles are first heated to a molten state, and then injected into the mold cavity under a certain pressure. After cooling and solidification, a preform with a specific shape and size is formed. During injection molding, the melted plastic needs to be injected into the mold through an injection molding machine, and then the plastic is quickly cooled in the mold to solidify into a preform. During the injection molding process, the temperature of the mold has a greater impact on the injection molding. In order to avoid the plastic solidifying before filling the mold and the temperature difference between the plastic and the mold is too large, the mold needs to be heated. However, the heating of the mold mostly makes the temperature of each part of the mold the same. During injection molding, the melted plastic has a process of flowing in the mold. The plastic that enters the mold first will flow to the far end of the mold with the pressure of the injection molding machine. Therefore, the plastic that enters the mold first has the longest distance. Since the temperature of the melted plastic is the same, during the flow process, the plastic with the longest distance is prone to solidification before reaching the final position, affecting the quality of the plastic preform. Utility Model Content

[0003] The utility model provides a heating mechanism for injection molding of PET plastic bottle embryos, which has the characteristics that when circulating oil with a relatively high temperature flows simultaneously and in the opposite direction with the molten plastic, the temperature of the plastic can be complementary to the temperature when the plastic flows, thereby being beneficial to improving the temperature uniformity of the plastic during the flow process, thereby avoiding the plastic from solidifying before flowing to the final position due to uneven temperature.

[0004] The utility model provides the following technical solution: it includes two half molds, a sensor, a driver, a heater and a cooler, and is characterized in that: the sensor is located at one side of the injection port of the half mold, the driver is located inside the half mold, and the sensor and the driver are connected by a connecting line, the inner sides of the two half molds are provided with heat exchange grooves, the heat exchange grooves are provided with flow channels, and the flow channels are provided with circulating oil, one end of the half mold is provided with an oil storage tank 1, and the other end of the half mold is provided with an oil storage tank 2, the heater is located at one side of the oil storage tank 1, the cooler is located at one side of the oil storage tank 2, the oil storage tank 1 and the oil storage tank 2 are both communicated with the flow channel, a movable rod is provided inside the driver, and movable blocks 1 and 2 are respectively provided at both ends of the movable rod.

[0005] The two half molds are symmetrical to each other and have the same structure.

[0006] Wherein, a channel 1 is opened inside the half mold, and two ends of the channel 1 are respectively connected to the flow channel and the oil storage tank 1.

[0007] Wherein, a second channel is opened inside the half mold, and two ends of the second channel are respectively communicated with the flow channel and the second oil storage tank.

[0008] Among them, the movable block 1 and the movable block 2 are located on the same straight line as the oil storage tank 1 and the oil storage tank 2, and the movable block 1 and the movable block 2 are respectively connected to the internal movability of the oil storage tank 1 and the oil storage tank 2.

[0009] The beneficial effect of the utility model is that when the circulating oil with a higher temperature flows simultaneously and in the opposite direction to the molten plastic, the temperature of the plastic when it flows can be complementary, so it is beneficial to improve the temperature uniformity of the plastic during the flow process, thereby avoiding the situation where the plastic solidifies before flowing to the final position due to uneven temperature, resulting in a decrease in the quality of the bottle embryo. In addition, through the process of the circulating oil flowing from the second oil storage tank to the first oil storage tank, the circulating oil with a lower temperature can flow inside the circulating oil, which is beneficial to improve the cooling speed of the plastic.

[0010] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a side cross-sectional structural schematic diagram of the utility model;

[0012] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0013] Figure 3 This is a schematic diagram of the use state of the utility model;

[0014] Figure 4 For the utility model Figure 3 Schematic diagram of the motion dynamics;

[0015] In the figure: 1. half mold; 11. channel 1; 12. channel 2; 13. sensor; 131. connecting line; 14. driver; 15. movable rod; 151. movable block 1; 152. movable block 2; 2. heat exchange tank; 21. flow channel; 211. circulating oil; 3. oil storage tank 1; 31. heater; 4. oil storage tank 2; 41. cooler. DETAILED DESCRIPTION

[0016] See also Figure 1-Figure 4The utility model provides the following technical scheme: it includes two half molds 1, a sensor 13, a driver 14, a heater 31 and a cooler 41, characterized in that: the sensor 13 is located at one side of the injection port of the half mold 1, the driver 14 is located inside the half mold 1, and the sensor 13 and the driver 14 are connected by a connecting line 131, a heat exchange groove 2 is provided on the inner side of the two half molds 1, a flow channel 21 is opened inside the heat exchange groove 2, and a circulating oil 211 is provided inside the flow channel 21, an oil storage tank 1 3 is provided at one end of the half mold 1, and an oil storage tank 2 4 is provided inside the other end of the half mold 1, the heater 31 is located at one side of the oil storage tank 1 3, the cooler 41 is located at one side of the oil storage tank 2 4, the oil storage tank 1 3 and the oil storage tank 2 4 are both communicated with the flow channel 21, a movable rod 15 is provided inside the driver 14, and movable blocks 1 151 and 152 are provided at both ends of the movable rod 15.

[0017] In this embodiment, it includes two half molds 1, a sensor 13, a driver 14, a heater 31 and a cooler 41. When the two half molds 1 are installed together, they will form a complete mold. When the mold core is docked with the mold, a plastic bottle embryo can be made by injecting molten plastic into the mold. The sensor 13 is located on one side of the injection port of the half mold 1. When the injection molding machine is aligned with the injection port of the half mold 1, the sensor 13 will sense it through laser or infrared rays. The driver 14 is located inside the half mold 1, and the sensor 13 and the driver 14 are connected by a connecting line 131. When the sensor 13 senses that the injection molding machine is aligned with the half mold 1 or separated from the half mold 1, it will transmit the signal to the connecting line 131. Driver 14, heat exchange grooves 2 are provided on the inner sides of the two half molds 1, and the heat exchange grooves 2 match the size of the preform to be produced. When injection molding, the molten plastic will enter the inner sides of the two heat exchange grooves 2, and a flow channel 21 is provided inside the heat exchange groove 2, and the flow channel 21 is parallel to the heat exchange groove 2. Circulating oil 211 is provided inside the flow channel 21, and the circulating oil 211 flows inside the flow channel 21. An oil storage tank 3 is provided at one end of the half mold 1, and the oil storage tank 3 is fixedly connected to the half mold 1, and the oil storage tank 3 is located outside the half mold 1. An oil storage tank 24 is provided inside the other end of the half mold 1, and the oil storage tank 24 has the same size as the oil storage tank 3, and the position of the oil storage tank 24 corresponds to the oil storage tank 3. The heater 31 is located on one side of the oil storage tank 3, and by heating The heater 31 can heat the medium inside the oil storage tank 1 3. By setting the heating temperature of the heater 31, the temperature of the medium inside the oil storage tank 1 3 can be increased to a specified temperature. The cooler 41 is located on one side of the oil storage tank 2 4. The medium inside the oil storage tank 2 4 can be cooled by the cooler 41. By setting the cooling temperature of the cooler 41, the temperature of the medium inside the oil storage tank 2 4 can be reduced to a specified temperature. The oil storage tank 1 3 and the oil storage tank 2 4 are both connected to the flow channel 21. The circulating oil 211 can flow between the oil storage tank 1 3, the flow channel 21 and the oil storage tank 2 4. When the circulating oil 211 is located inside the oil storage tank 1 3, the temperature of the circulating oil 211 is increased to match the temperature of the molten plastic by the heater 31. When the oil storage When the circulating oil 211 in the tank 1 3 flows into the oil storage tank 2 4, the circulating oil 211 with a higher temperature will flow inside the flow channel 21, and the temperature of the circulating oil 211 will gradually decrease as the distance from the oil storage tank 1 3 increases. When the plastic and the circulating oil 211 flow at the same time, they can complement the temperature of the plastic when it flows, so it is beneficial to improve the temperature uniformity of the plastic during the flow process, thereby avoiding the situation where the plastic solidifies before flowing to the final position due to uneven temperature, resulting in a decrease in the quality of the bottle preform. At the same time, the circulating oil 211 will flow into the oil storage tank 2 4, and the temperature of the circulating oil 211 in the oil storage tank 2 4 will be reduced through the cooler 41. When the circulating oil 211 in the oil storage tank 2 4 flows into the oil storage tank 3,The circulating oil 211 with a lower temperature will flow inside the flow channel 21, which is beneficial to increasing the cooling speed of the plastic. A movable rod 15 is provided inside the driver 14, and the movable rod 15 can perform a sliding reciprocating motion through the driver 14. The two ends of the movable rod 15 are respectively provided with a movable block 151 and a movable block 2 152. When the sensor 13 recognizes that the injection molding machine and the half mold 1 are aligned, the driver 14 will make the movable rod 15 slide in the direction of the oil storage bin 3, so that the movable block 151 enters the interior of the oil storage bin 3. The movable block 151 and the two sides of the oil storage bin 3 are sealed by a rubber sealing gasket. When the movable block 151 slides into the interior of the oil storage bin 3, the circulating oil 211 in the oil storage bin 3 is pushed into the interior of the flow channel 21. When the sensor 13 recognizes that the injection molding machine and the half mold 1 are separated, the driver 14 will make the movable rod 15 slide in the direction of the oil storage bin 3, so that the movable block 151 enters the interior of the oil storage bin 3. 15 slides toward the direction of the oil storage bin 24, so that the movable block 2 152 enters the interior of the oil storage bin 24. The movable block 2 152 and the two sides of the oil storage bin 24 are sealed by rubber sealing pads. When the movable block 2 152 slides toward the interior of the oil storage bin 24, the circulating oil 211 inside the oil storage bin 24 is pushed to the interior of the flow channel 21. When the circulating oil 211 with a higher temperature flows simultaneously and in the opposite direction with the molten plastic, it can complement the temperature of the plastic when it flows. Therefore, it is beneficial to improve the uniformity of the temperature of the plastic during the flow process, thereby avoiding the situation where the plastic solidifies before flowing to the final position due to uneven temperature, resulting in a decrease in the quality of the bottle embryo. In the process of the circulating oil 211 moving from the oil storage bin 24 to the oil storage bin 13, the circulating oil 211 with a lower temperature can flow inside the flow channel 21, which is beneficial to improve the cooling speed of the plastic.

[0018] The two half molds 1 are symmetrical to each other and have the same structure; the internal structure of the two half molds 1 is completely the same as the external structure, and the two half molds 1 are combined to form a mold groove and an injection port.

[0019] A channel 11 is provided inside the half mold 1, and the two ends of the channel 11 are respectively connected to the flow channel 21 and the oil storage tank 3; through the connection of the channel 11, the circulating oil 211 can flow between the oil storage tank 3 and the flow channel 21.

[0020] A second channel 12 is provided inside the half mold 1 , and both ends of the second channel 12 are connected to the flow channel 21 and the second oil storage tank 4 respectively; through the connection of the second channel 12 , the circulating oil 211 can flow between the second oil storage tank 4 and the flow channel 21 .

[0021] The movable block 151 and the movable block 2 152 are located on the same straight line as the oil storage tank 1 3 and the oil storage tank 2 4, and the movable block 151 and the movable block 2 152 are respectively movably connected to the interior of the oil storage tank 1 3 and the oil storage tank 2 4; when the movable block 151 enters the interior of the oil storage tank 1 3, the circulating oil 211 inside the oil storage tank 1 3 can be pushed outward, and when the movable block 2 152 enters the interior of the oil storage tank 2 4, the circulating oil 211 inside the oil storage tank 2 4 can be pushed outward.

[0022] The working principle and use process of the utility model are as follows: during use, when the sensor 13 recognizes that the injection molding machine and the half mold 1 are aligned, the driver 14 will slide the movable rod 15 in the direction of the oil storage bin 3, so that the movable block 151 enters the interior of the oil storage bin 3, and the movable block 151 and the two sides of the oil storage bin 3 are sealed by a rubber sealing gasket. When the movable block 151 slides toward the interior of the oil storage bin 3, the circulating oil 211 in the oil storage bin 3 will be pushed into the interior of the flow channel 21, and the circulating oil 211 with a higher temperature in the oil storage bin 3 will flow inside the flow channel 21, and the temperature of the circulating oil 211 will gradually decrease as the distance from the oil storage bin 3 increases. When the plastic and the circulating oil 211 flow at the same time, it can complement the temperature of the plastic when it flows. It is beneficial to improve the temperature uniformity of the plastic during the flow process. At the same time, the circulating oil 211 will flow into the interior of the oil storage tank 24, and the temperature of the circulating oil 211 inside the oil storage tank 24 will be reduced through the cooler 41. When the sensor 13 recognizes that the injection molding machine is separated from the half mold 1, the driver 14 will slide the movable rod 15 toward the direction of the oil storage tank 24, so that the movable block 252 enters the interior of the oil storage tank 24. The movable block 252 and the two sides of the oil storage tank 24 are sealed by rubber sealing pads. When the movable block 252 slides toward the interior of the oil storage tank 24, the circulating oil 211 inside the oil storage tank 24 will be pushed to the interior of the flow channel 21. The circulating oil 211 with a lower temperature inside the oil storage tank 24 will flow inside the flow channel 21, which is beneficial to improve the cooling speed of the plastic.

Claims

1. A heating mechanism for PET plastic bottle preform injection molding, comprising two half molds (1), a sensor (13), a driver (14), a heater (31) and a cooler (41), characterized in that: The sensor (13) is located at the injection port side of the half mold (1), the driver (14) is located inside the half mold (1), and the sensor (13) and the driver (14) are connected via a connecting line (131). The inner sides of the two half molds (1) are provided with a heat exchange groove (2), the interior of the heat exchange groove (2) is provided with a flow channel (21), the interior of the flow channel (21) is provided with circulating oil (211), and one end of the half mold (1) is provided with an oil storage tank. One (3), an oil storage tank two (4) is provided inside the other end of the half mold (1), the heater (31) is located on one side of the oil storage tank one (3), the cooler (41) is located on one side of the oil storage tank two (4), the oil storage tank one (3) and the oil storage tank two (4) are both communicated with the flow channel (21), a movable rod (15) is provided inside the driver (14), and movable blocks one (151) and two (152) are provided at both ends of the movable rod (15).

2. A heating mechanism for PET plastic bottle embryo injection molding according to claim 1, characterized in that: The two half molds (1) are symmetrical to each other, and the two half molds (1) have the same structure.

3. A heating mechanism for PET plastic bottle embryo injection molding according to claim 2, characterized in that: A channel (11) is provided inside the half mold (1), and two ends of the channel (11) are respectively connected to the flow channel (21) and the oil storage tank (3).

4. A heating mechanism for PET plastic bottle embryo injection molding according to claim 3, characterized in that: A second channel (12) is provided inside the half mold (1), and two ends of the second channel (12) are respectively connected to the flow channel (21) and the second oil storage tank (4).

5. A heating mechanism for PET plastic bottle embryo injection molding according to claim 4, characterized in that: The movable block 1 (151) and the movable block 2 (152) are located on the same straight line as the oil storage tank 1 (3) and the oil storage tank 2 (4), and the movable block 1 (151) and the movable block 2 (152) are respectively movably connected to the inside of the oil storage tank 1 (3) and the oil storage tank 2 (4).

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