A bottom mold electric heating device

Abstract

The present invention discloses a bottom mold electric heating device, including two left and right mold flaps that can be opened and closed, a bottom mold and a cylinder, wherein the cylinder includes a cylinder body, a piston that can slide relative to the cylinder body, a support seat connected to the piston, and two ventilation pipe joints, characterized in that a heating block mounting seat is also provided on the support seat, the heating block mounting seat is hollow inside, and can form a receiving cavity when combined with the bottom mold, and an electric heating block that can heat the bottom mold is placed in the receiving cavity. The present invention has a simple structure, and the bottom mold is heated by an electric heating block. The structure omits the complex oil circuit of the oil heating method, and only needs to set up one channel for wiring, and there will be no oil pollution caused by the oil heating method, and it is convenient for repair and maintenance.

Description

Technical Field

[0001] The invention relates to a hot filling bottle device, in particular to a device for heating a hot filling bottom mold. Background Art

[0002] The preform needs to be placed in a mold and blown into a container bottle. For aesthetic reasons and to give the filled bottle a three-dimensional feel, various patterns are engraved on the mold. During hot filling, the plastic of the filled bottle softens and is easily deformed and shrunken when cooled and shrunk. To solve this problem, a retractable bottom mold with a heating function is usually set at the bottom of the mold. During the bottle blowing process, the bottom of the bottle is first blown into a convex bottom, and then a cylinder is used to push the bottom mold upward, turning the downward convex bottle bottom into an upward concave shape, thereby compensating for the overall cooling shrinkage of the bottle body, so that the shape of the bottle remains intact and does not deform or shrunken.

[0003] In the existing hot-filled bottles with retractable bottoms, the bottom mold is usually heated to ensure smooth squeezing of the bottom of the bottle. Generally, oil heating is adopted, and an oil circuit is set at the lower end of the bottom mold. During the bottle blowing process, hot oil is introduced to heat the bottom mold, and then the cylinder pushes the bottom mold up; this heating method requires the setting of a complex oil circuit channel and requires high sealing, otherwise oil leakage is likely to occur, the oil pipeline joints take up space and are not clean and environmentally friendly, and the device needs to be regularly maintained and cleaned; in addition, the oil heating method is relatively slow. Summary of the invention

[0004] The invention provides a bottom mold electric heating device which has simple structure, fast heating, energy saving and environmental protection.

[0005] The bottom mold electric heating device described in the present invention includes two left and right openable mold flaps, a bottom mold and a cylinder. The cylinder includes a cylinder body, a piston that can slide relative to the cylinder body, a support seat connected to the piston, and two ventilation pipe joints. A heating block mounting seat is also provided on the support seat. The heating block mounting seat is hollow inside and can form a accommodating cavity when combined with the bottom mold. The electric heating block that can heat the bottom mold is placed in the accommodating cavity.

[0006] The bottom mold electric heating device is provided with a heating block mounting seat for fixing the heating block on the support seat. The interior of the heating block mounting seat is set to be hollow, and it is closed with the bottom mold to form a receiving cavity, in which the electric heating block can be placed. Before the bottom mold is pushed up, the electric heating block can quickly heat the bottom mold, so that after the bottom mold push-up action starts, the heated bottle bottom is easily pushed up from a downward convex shape to an upward concave shape by the bottom mold; in addition, the receiving cavity formed by the heating block mounting seat and the bottom mold wraps the electric heating block, which can maintain a certain amount of heat, saving energy and heating time. The present invention has a simple structure, heats the bottom mold by the electric heating block, and eliminates the complex oil circuit of the oil heating method in structure. Only one channel needs to be set for wiring, and there will be no oil pollution caused by the oil heating method, which is convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The figure is a structural diagram of a bottom mold electric heating device. DETAILED DESCRIPTION

[0008] like Figure 1 As shown, a bottom mold electric heating device comprises two left and right mold halves (1) that can be opened and closed, a bottom mold (2) and a cylinder (3), wherein the cylinder (3) comprises a cylinder body (301), a piston (302) that can slide relative to the cylinder body (301) inside the cylinder body (301), a support seat (303) connected to the piston (302), and two ventilation pipe joints (304), wherein the support seat (303) is also provided with a heating block mounting seat (4), wherein the heating block mounting seat (4) is hollow inside and can be closed with the bottom mold (2) to form a receiving cavity, wherein an electric heating block (5) that can heat the bottom mold (2) is placed in the receiving cavity. During the blowing process, a bottle embryo is placed in the mold, and after the two mold halves are closed, the bottle embryo is first blown into a convex bottom, and then the bottom mold is quickly heated by the electric heating block, and the bottom mold is pushed upward by the cylinder to push the downwardly convex bottle bottom into an upwardly concave shape. A heating block mounting seat for fixing the heating block is arranged on the support seat. The interior of the heating block mounting seat is arranged to be hollow, and a receiving cavity is formed when the heating block mounting seat is closed with the bottom mold, in which the electric heating block can be placed. Before the bottom mold is pushed up, the electric heating block can quickly heat the bottom mold, so that after the bottom mold push-up action starts, the heated bottle bottom is easily pushed up from a downwardly convex shape to an upwardly concave shape by the bottom mold; in addition, the receiving cavity formed when the heating block mounting seat and the bottom mold are closed wraps the electric heating block, which can maintain a certain amount of heat, and can reduce the heating time when heated again, saving energy and time. The present invention has a simple structure, and the bottom mold is heated by the electric heating block. The complex oil circuit of the oil heating method is omitted in the structure, and only one channel needs to be set for wiring, and there will be no oil pollution caused by the oil heating method, and it is convenient for maintenance.

[0009] In the bottom mold electric heating device, a temperature measuring device is installed in a receiving cavity formed by the heating block mounting seat (4) and the bottom mold (2), and is used to detect the internal temperature of the receiving cavity. The temperature measuring device is installed inside the receiving cavity, and when the electric heating block is heated to a certain high temperature, the temperature of the bottom mold can be known by detecting the temperature of the receiving cavity, and the heating can be stopped, and then the cylinder is controlled to push the bottom mold upward.

[0010] The bottom mold electric heating device is hollow inside the support seat (303), and a wire routing channel (6) is provided inside the piston (302). A hollow guide post (7) is installed at the opening of the wire routing channel (6). A guide post opening adapted to the guide post (7) is provided at the bottom of the cylinder body (301). The guide post (7) extends from the guide post opening, and the guide post (7) can slide along with the piston (302). The support seat is hollow, and a wire routing channel is provided inside the piston, which can be used for routing the electric heating block wire and the temperature measuring device signal line. A hollow guide post is provided at the outlet of the wire routing channel on the piston, which extends out of the cylinder body, and can lead the electric heating block wire and the temperature measuring device signal line out of the mold. The guide post can be configured as a telescopic structure, and slide along with the piston.

[0011] In the bottom mold electric heating device, an annular groove (701) is provided inside the guide pillar opening, and a sealing ring (702) and a guide ring (703) are installed in the annular groove (701). The sealing ring and the guide ring can ensure the air tightness of the device, so that the device can run stably. In order to prevent air pressure leakage, sealing rings and guide rings are installed at the connection points of various parts of the cylinder to ensure the air tightness of the device.

[0012] In the bottom mold electric heating device, a bottom mold heightening pad (8) is installed between the support seat (303) and the heating block base (4). The bottom mold heightening pad can be provided to change the height of the bottom mold heightening seat according to different bottle shapes so that the bottom mold height is consistent with the height of the mold petal.

[0013] In the bottom mold electric heating device, a heat-insulating mounting sleeve (9) made of high-temperature resistant material is installed between the bottom mold heightening pad (8) and the heating block mounting seat (4). The heat-insulating mounting sleeve is made of high-strength temperature-resistant material and can isolate the high temperature generated by the electric heating block, preventing a large amount of heat from being conducted to the bottom mold heightening pad and the components thereunder, causing overheating damage, thereby reducing the failure rate of each component.

[0014] In the bottom mold electric heating device, the bottom of the cylinder body (301) is also connected to a connection block (10), and a pull pin (11) is also provided in the middle of the connection block (10). A bottom mold locking mechanism can be connected below the connection block, and the connection block and the bottom mold locking mechanism can be quickly connected and fixed by the pull pin.

Claims

1. A hot filling bottom mold electric heating device, comprising two left and right openable mold halves (1), a bottom mold (2) and a cylinder (3), wherein the cylinder (3) comprises a cylinder body (301), a piston (302) inside the cylinder body (301) and capable of sliding relative to the cylinder body (301), a support seat (303) connected to the piston (302), and two ventilation pipe joints (304), characterized in that: The support seat (303) is also provided with a heating block mounting seat (4). The interior of the heating block mounting seat (4) is hollow. When the heating block mounting seat (4) is closed with the bottom mold (2), a receiving cavity is formed. An electric heating block (5) capable of heating the bottom mold (2) is placed in the receiving cavity. A temperature measuring device is installed in the receiving cavity formed by the heating block mounting seat (4) and the bottom mold (2). The temperature measuring device is used to detect the internal temperature of the receiving cavity. The interior of the support seat (303) is hollow. A wiring channel (6) is provided inside the piston (302). A hollow guide column (7) is sealed at the mouth of the wiring channel (6). The bottom of the cylinder body (301) is provided with a temperature measuring device adapted to the guide column (7). A guide post opening is formed, a guide post (7) extends from the guide post opening, and the guide post (7) can slide along with the piston (302); an annular groove (701) is provided on the inner side of the guide post opening, a sealing ring (702) and a guide ring (703) are installed in the annular groove (701); a bottom mold heightening pad (8) is installed between the support seat (303) and the heating block mounting seat (4); a heat-insulating mounting sleeve (9) made of a high-temperature resistant material is installed between the bottom mold heightening pad (8) and the heating block mounting seat (4); a connecting block (10) is also connected to the bottom of the cylinder body (301), and a rivet (11) is also provided in the middle of the connecting block (10).

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