Lifting oil cylinder with buffer structure

Abstract

The invention relates to a lifting oil cylinder with a buffer structure. The lifting oil cylinder comprises a cylinder barrel, a cylinder bottom, a cylinder cover, a plunger rod and a plunger. According to the improvement, a three-stage step hole serves as a center oil hole of the cylinder bottom and comprises a buffer sleeve hole, a buffer column hole and a center oil hole which are communicatedin sequence; a buffer sleeve is arranged in the buffer sleeve hole, and an oil return hole is formed in the buffer sleeve; an outwards-protruding buffer column is arranged at the rod end of the plunger rod, and the buffer column and an inner hole of the buffer sleeve are in movable fit; four or more plunger grooves are formed in the outer circumference of the plunger; and when a buffer function isachieved during work, the plunger rod moves towards one side of the cylinder bottom, the buffer column gradually stretches into the buffer column hole through the buffer sleeve, a small gap is formedbetween the cylindrical face of the buffer column and the inner hole of the buffer sleeve, most oil flows back to an oil tank through the oil return hole in the buffer sleeve, and buffer is formed. During work, when entering oil ascends, part of hydraulic oil directly acts on the bottom of the buffer column, part of hydraulic oil enters the cylinder barrel through 6 oil grooves around the buffersleeve, ascending fast responding is achieved, pressure losses are small, and oil temperature is prevented from being increased.

Description

technical field [0001] The invention belongs to the technical field of forklifts, and in particular relates to a lifting cylinder of a forklift. Background technique [0002] As an important engineering vehicle, forklifts are widely used in various industries to stack goods; the lifting cylinder is used as a hydraulic actuator, see Figure 13 , plays a very important role in ensuring the smooth operation of the mast. At present, the lifting cylinder of domestic forklifts has a buffer function, but there are also problems such as unsatisfactory buffer effect, complex buffer structure, many parts, easy damage, and large oil inlet resistance; the diameter of the oil inlet at the bottom of the cylinder is generally φ15mm. Buffering, changing the direction and diameter of the oil inlet, the diameter becomes smaller to φ2~φ5mm, and the large oil inlet changes to a small oil inlet. The oil inlet is not smooth enough, the lifting response is slow, the pressure loss is large, and th...

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Problems solved by technology

At present, the lifting cylinder of domestic forklifts has a buffer function, but there are also problems such as unsatisfactory buffer effect, complex buffer structure, many parts, easy damage, and large oil inlet resistance; the diameter of the oil inlet at the bottom of the cylinder is generally φ15mm. Buffering, changing the direction and diameter of the oil inlet, the diameter becomes smaller to φ2~φ5mm, and the large oil inlet changes to a small oil inlet. The oil inlet is not smooth enough, the lifting response is slow, the pressure loss is large, and the oil in the hydraulic system Temperature rise and other phenomena, the present invention can solve the above-mentioned existing problems

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