Hydraulic buffering device for injection molding machine

Abstract

The invention provides a hydraulic buffering device for an injection molding machine, and belongs to the technical field of buffering protection devices for injection molding machines. The hydraulic buffering device for the injection molding machine comprises a collision block and a rear end buffering oil cylinder adapted to the collision block, the rear end buffering oil cylinder comprises an oilcylinder barrel, an oil cylinder rear cover and a guide rod which are arranged in sequence, the oil cylinder barrel is axially provided with a movable cavity, the guide rod is axially provided with an oil guide through hole, the middle of the oil cylinder rear cover is provided with an oil drainage hole which communicates with the oil guide through hole and the movable cavity, a piston rod is axially inserted in the movable cavity, the outer wall of the piston rod is in sealed connection with the inner wall of the movable cavity, the end, away from the oil cylinder rear cover, of the piston rod is provided with a buffering cushion block adapted to the collision block, the guide rod is movably provided with a screw plug used for opening and closing an inlet of the oil guide through hole, the guide rod is provided with a precompression spring, and the oil cylinder rear cover is fixed to an installation position through the precompression spring. The hydraulic buffering device for the injection molding machine has the advantages of being simple and compact in structure and high in working reliability.

Description

technical field [0001] The invention belongs to the technical field of buffer protection devices for injection molding machines, and relates to a hydraulic buffer device for injection molding machines. Background technique [0002] In the case of a sudden failure of the injection motor of the injection molding machine, the pre-molding seat will quickly retreat due to the high pressure in the barrel cavity. If there is no buffer protection device, the pre-plastic seat will directly hit the tail plate of the injection platform at a very fast speed. This high-speed impact will cause deformation of precision parts such as the injection screw and even scrapping. [0003] Currently on the market, it is generally used as mechanical protection for motor reverse torque brakes, electromagnetic brakes and other auxiliary devices (such as follower cylinders). In the case of a sudden failure of the injection motor, the reverse torque brake cannot be provided, so it is unreliable. Elect...

AI Technical Summary

Problems solved by technology

In the case of sudden failure of the injection motor, the reverse torque brake can no longer be provided, so it is unreliable

Electromagnetic holding brakes are divided into external and built-in types, which are expensive in themselves, and the supporting control system requires high cost

The following cylinder usually follows the full stroke and needs to be connected to an external hydraulic system, which is bulky, expensive, and difficult to guarantee reliability

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