Cushion cylinder for hot-chamber die casting machine

Abstract

The invention belongs to the technical field of pressure casting and discloses a cushion cylinder for a hot-chamber die casting machine. The cushion cylinder for the hot-chamber die casting machine comprises a cylinder body; the left end of the cylinder body is provided with a left end cover in a matched mode; the right end of the cylinder body is provided with a right end cover in a matched mode; a piston is arranged in a piston cavity inside the cylinder body in a matched mode; the piston is fixedly connected with a piston rod; the piston rod penetrates through the left end and is in sliding connection with the left end cover; a cushion cover is arranged on the right end cover and comprises an outer housing and an inner housing; an air channel communicated with the piston cavity is formed between the outer housing and the inner housing; a through hole is formed in the position, inside the inner housing, of the right end cover and is connected with an airbag in a covering mode; a cushion chamber is formed between the airbag and the inner housing. When the piston rightwards moves in the piston cavity, part of compressed air enters the cushion chamber through the air channel, so that the airbag is inflated and expands, when the piston rightwards moves to the limitation position, the piston moving at a high speed impacts on the airbag, cushioning is formed, and the piston decelerates gradually. Through the cushioning mode, the piston is prevented from directly colliding with the right end cover, and the cylinder is prevented from being destroyed.

Description

technical field [0001] The invention belongs to the technical field of die casting. Background technique [0002] The die-casting machine is a series of industrial casting machines that hydraulically inject molten metal into the mold for cooling and forming under pressure, and obtain solid metal castings after the mold is opened. With the advancement of science and technology and industrial production, especially with the development of industries such as automobiles, motorcycles and household appliances, die-casting technology has developed extremely rapidly. [0003] Die-casting machines are generally divided into two categories: hot-chamber die-casting machines and cold-chamber die-casting machines. Hot-chamber die-casting machines mainly include mold clamping mechanism, injection mechanism, top piece structure, transmission system and control system. Molten molten metal is injected into the mold of the clamping structure. The molten metal comes from a holding tank conne...

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Problems solved by technology

And the existing cylinder cushioning device is usually provided with a spring device on the piston, so as to prevent the piston from directly hitting the end cover and causing damage to the cylinder. According to the position of the spring, it is divided into a single-side cushioning cylinder and a double-side cushioning cylinder. The disadvantage is that it is more troublesome to install the spring on the piston. When the spring needs to be replaced, the piston needs to be disassembled from the cylinder. However, the peripheral surface of the existing piston adopts the piston ring and the cylinder to achieve a sliding seal, so it is difficult to disassemble the piston. When reinstalling the piston, it is also necessary to test the air tightness of the piston

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