Oil return structure of injection cylinder

Abstract

The invention discloses an oil return structure of an injection oil cylinder. The oil return structure comprises an oil cylinder barrel and an injection rod and further comprises an adjustment lever, wherein a cavity is formed in the adjustment lever; one end of the adjustment lever is arranged in the injection rod in a sleeving manner, and the other end of the adjustment lever is connected with the oil cylinder barrel; a first oil hole is formed in a part, close to an injection piston of the injection rod; a second oil hole is formed in a part, close to a free end of the adjustment lever; a first oil discharge outlet is formed in a part, close to a rod cavity opening, of the oil cylinder barrel; and an oil inlet is formed in a part, close to a rodless cavity opening, of the oil cylinder barrel. The oil return structure of the injection oil cylinder is adjusted, so that the purpose that the outlet flow rate of the injection oil cylinder can be adjusted by a common oil valve to control the injection speed is realized.

Description

technical field [0001] The application relates to the field of die-casting accessories, in particular to an oil return structure of an injection cylinder. Background technique [0002] For the production of high-demand die-casting products, it is necessary for the die-casting machine to provide high-speed injection. However, high-speed injection cannot last the entire injection process and fill the cavity in a short time. However, if the high-speed injection continues until the injection is terminated, a huge impact force of the injection will be generated, which will cause flashing of the die-casting product and shorten the service life of the mold. [0003] Therefore, it is necessary to control the injection speed of the injection cylinder. Before the end of the injection, the injection speed is rapidly reduced to achieve the effect of fast filling, reduced impact force, and reduced flashing of die-casting products. [0004] The working principle of the injection part of...

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Problems solved by technology

[0004] The working principle of the injection part of the conventional die casting machine is as follows: figure 1 Shown: The flow at the inlet is adjusted to achieve the adjustment of the hammer front speed, but the deceleration phase in the high speed section cannot be controlled

The disadvantages brought about by this are: the high and low speed switching of the hammer head must be completed by the reaction force of the aluminum liquid in the cavity, resulting in a large impact on the grinding mold by the hammer head, and the product is prone to flashing; under long working hours, the mold It is also prone to cracks, which has a certain impact on the life of the mold, and the impact noise is also large

[0005] In the prior art, in order to solve the above-mentioned problems, the outlet throttling method is adopted, such as figure 2 As shown, it is possible to decelerate at the end of the injection, but at a higher cost

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