HYDRAULIC STRUCTURE OF STEEL BAR CUTTING MACHINE

摘要

A hydraulic structure of a steel bar cutting machine, comprising a pump body (1), an eccentric shaft (2), and a plunger assembly. The pump body is internally provided with a plunger hole (3); the plunger assembly comprises a plunger (41), a plunger spring (42), a check valve (43), a check valve spring (44), and a plug (45) that are successively arranged from top to bottom in the plunger hole; and a wall of the plunger hole is opened with an oil inlet passage (31) and an oil outlet passage (32); the plunger assembly further comprises a plunger sleeve (46) sleeved outside of the plunger, the plunger sleeve is disposed in the plunger hole, and the plunger is in clearance-fit arrangement in the plunger sleeve and is driven by the eccentric shaft to reciprocate in the plunger sleeve. The plunger sleeve is opened thereon with an oil inlet hole (461) that communicates with the oil inlet passage and an inner part of the plunger sleeve. The described structure is provided with a plunger sleeve between the plunger and the plunger hole, so that the plunger only rubs against the plunger sleeve when reciprocating, and only the plunger and the plunger sleeve are worn after long-term operation, such that there is no need to replace the entire pump body, thereby reducing the maintenance and usage costs of the steel bar cutting machine.