Die opening and closing device for blow molding machine

Abstract

The invention relates to a die opening and closing device for a blow molding machine. The die opening and closing device comprises a forming die plate seat, two inner die plates, two die locking devices, a bottom die holder, a cam device and a driving mechanism, wherein the forming die plate seat is used for erecting the two inner die plates positioned on the two sides, the two die locking devices and the bottom die holder positioned between the inner die plates; the driving mechanism is connected with the cam device, and the cam device is connected with the two inner die plates, the two die locking devices and the bottom die holder, so that the fore and aft reciprocating movement of the two inner die plates and the two die locking devices are realized, and meanwhile the bottom die holder is driven to move up and down and synchronously carries on die opening and closing actions. Under the driving of one servo motor, a bottom die and the two inner die plates can synchronously carry on the die opening and closing actions; and further the die opening and closing device can fast and accurately open and close two half dies and the bottom die of the blow molding machine. The forming structure of a bottle blowing machine is simplified, and the manufacturing cost of machines is effectively reduced.

Description

[0001] 【Technical field】 [0002] The invention belongs to a mold opening and closing device of a blow molding machine, in particular to a mold opening and closing device of a blow molding machine with simple structure and precise mold opening and closing action. [0003] 【Background technique】 [0004] Common plastic containers such as plastic bottles are mostly made by molding. The so-called molding refers to placing the blank in the cavity of two corresponding half-molds, and then the two half-molds are matched (mold-closed) by the opening and closing mechanism, so that the blank can be adjusted under temperature, pressure, etc. Under the change, it is shaped into a product corresponding to the shape of the mold cavity, and then the two half-moulds (mold opening) are opened by the mold opening and closing mechanism to take out the molded product. [0005] Since the molding of the blank usually needs to be completed by means of pressure changes, and this pressure will genera...

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Problems solved by technology

[0007] The above-mentioned mold closing device uses a pneumatic cylinder or an hydraulic cylinder as a power source. The advantage of using a pneumatic cylinder or an hydraulic cylinder as a power source is that the action response is faster, but there are also the following problems: First, the pneumatic cylinder or hydraulic cylinder The movement positioning of the cylinder is relatively inaccurate, and it is easy to be accompanied by vibration. Incorrect positioning will affect the mold clamping effect, and thus easily produce defective products; while the vibration of opening and closing the mold may affect the accuracy of related actions during the molding process; Otherwise, the use of pneumatic cylinders or hydraulic cylinders requires additional pressure pumps and storage containers, which easily leads to waste of energy

[0012] However, in the aforementioned patents, only the mold opening and closing device for opening and closing the two half-moulds is disclosed, but for blow-molded plastic bottles, the mold is usually formed by two half-moulds cooperating with a bottom mold. Composition, the aforementioned patented technologies only disclose the technology of opening and closing the two half molds, as for the part of the bottom mold is usually driven by another air / hydraulic cylinder, such a design can not meet the requirements of the all-electric type , and the actions of the bottom mold driven by the air / hydraulic cylinder and the two half-moulds driven by the electric motor are not easy to be synchronized, which will affect the actuation time of the entire mold opening and closing device, which in turn will affect the operation of the blow molding machine efficiency

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