Two-platen hydraulic injection molding machine normal pressure, pressurized, high pressure mold clamping circuit

Abstract

The invention discloses a two-platen hydraulic injection molding machine with normal pressure, boosted pressure and high pressure mold clamping circuit, including a mold clamping hydraulic cylinder, a booster hydraulic cylinder, a two-position three-way reversing valve, and a two-position two-way reversing valve of the mold clamping oil circuit And clamping oil circuit check valve, characterized in that: the pressure oil pipe is connected to the pressure side oil port P of the three-position four-way reversing valve through the first branch pressure oil pipe, and the right end of the three-position four-way reversing valve The side oil port A is connected to the oil port of the rodless chamber of the large oil cylinder of the pressurized hydraulic cylinder; the upper oil port B on the left end of the three-position four-way reversing valve is connected with the rod chamber of the small oil cylinder of the pressurized hydraulic cylinder through a connecting oil pipe At the same time, the oil port B on the left end of the three-position four-way reversing valve is also communicated with the rodless cavity of the small oil cylinder of the pressurized hydraulic cylinder through the second branch oil pipe. This circuit is simple in structure, easy to operate, and has two functions of normal pressure mold clamping and high pressure mold clamping. It can not only realize mold clamping, but also slow down the impact buffer on the contact surface of the mold through normal pressure mold clamping, so as to achieve the initial stability of the mold clamping process. Require.

Description

technical field [0001] The invention relates to an improvement of a hydraulic high-pressure mold-clamping circuit of an injection molding machine, in particular to a normal-pressure, pressurized and high-pressure mold-clamping circuit of a two-platen hydraulic injection molding machine. Background technique [0002] The injection molding machine is the main equipment for injection molding. The hydraulic high-pressure clamping circuit is the key circuit system of the injection molding machine, which effectively ensures the locking of the mold. At present, although there are multiple reports on the hydraulic high-pressure mold clamping circuit used in the two-platen injection molding machine, such as the disclosed "two templates with large opening distance full hydraulic clamping injection molding machine" disclosed by the Chinese Patent Publication No. CN101758605A and the disclosed "large Clamping oil circuit system of two-platen injection molding machine", its structure inc...

AI Technical Summary

Problems solved by technology

But there are also the following disadvantages: first, the structure is complex, the operation process is cumbersome, and the action response speed is difficult to improve; second, the diameter of the clamping hydraulic cylinder is often limited by the size, resulting in insufficient clamping force. In order to improve the clamping force, the current method is Increase the oil pressure of the hydraulic system, which increases power consumption; third, it does not have the function of normal pressure mold clamping; fourth, when high pressure mold clamping, power matching is difficult to adjust, impact resistance and process stability are poor; fifth, due to the structure Complex, under the condition of a certain failure rate of a single component, the reliability of the whole system is reduced

[0003] According to the search, there is no two-platen hydraulic injection molding machine with normal pressure, pressurized pressure, and high pressure mold clamping that can not only realize mold clamping, but also reduce the impact on the contact surface of the mold through normal pressure clamping, and meet the initial stability requirements of the clamping process. loop report

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