CN100595126C

CN100595126C - Bearing released hydraulic jack oil pump loop

Info

Publication number: CN100595126C
Application number: CN200610155159A
Authority: CN
Inventors: 周浩良
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-12-08
Filing date: 2006-12-08
Publication date: 2010-03-24
Anticipated expiration: 2026-12-08
Also published as: CN100999302A

Abstract

The present invention relates to a load slowly-released hydraulic jack oil pump loop. It includes oil cylinder, oil pump, oil-releasing loop and oil-releasing valve. The connection position of oil-releasing loop and oil-cylinder inner cavity is equipped with an automatic damping structure; on the oil-releasing loop are successively set a damping hole and a spring hole, in the connection position of said damping hole and spring hole a step is formed, in the damping hole is set a damper which can be slided, between the peripheral surface of said damper and hole wall of said damping hole a certain space distance is existed. Between the end face of said damper and the described step a valve port is formed, on the damper an oil-discharging hole or an oil-discharging channel passed through end face is made; in the spring hole a spring is set, said spring can be used for applying force to said damper. The space distance between the peripheral surface of damper and hole wall of damping hole is0.1-1 mm.

Description

A kind of hydraulic jack oil pump loop of load slow release

Technical field

The present invention relates to a kind of hydraulic jack, especially have the hydraulic jack of load slow release structure.

Background technology

General hydraulic jack can keep comparatively gradual drop speed when withstanding on unloaded release; But after having born load,, the flow velocity of fluid when discharging is strengthened because in-cylinder pressure increases; Conventional jack is when load discharges, and the operator needs carefully to open spill valve lentamente and comes proof load steadily to descend, but as the user for just with person or careless manipulation, just may cause that load descends fast, thus the potential safety hazard of causing.In recent years, the descending speed during both at home and abroad all to the jack load stipulates, opens discharge-service valve during the jack bearing load usually, and its descending speed must not be greater than 150MM/S.Chinese patent application 200420078326.8 discloses name and has been called " a kind of hydraulic unit that has the hydraulic slow release device " patent application.Its technical scheme is that the valve rod of draining the oil is designed to the sealing of front end and drain oil, and there is big gap the rear end, and the valve rod jack when a small amount of rotation that guarantees to drain the oil of the effect successively by sealed end and rear end descends at a slow speed, and the effect of decline fast after rotating again.But this scheme still exists complex structure, processing difficulties, and manipulates the defective of time trouble, and rotates the potential safety hazard that still has quick decline when excessive at the valve rod of draining the oil.

Summary of the invention

The purpose of this invention is to provide the improvement of hydraulic jack oil pump loop, this jacking oil pump loop should be able to overcome the deficiency of above-mentioned background technology, can reduce dredge oil amount automatically when oil pressure increases in cylinder, guarantee load slow release, and simple in structure, easy to manufacture, with low cost.

The technical solution used in the present invention is: a kind of hydraulic jack oil pump loop of load slow release, comprise the oil cylinder that is positioned on the frame, by the delivery line oil transportation to order about the oil pump of cylinder piston motion, the drain the oil oil cock in loop of drain the oil loop and the control of conducting oil cylinder and shoe cream room respectively, described loop and the cylinder cavity joint of draining the oil is provided with the autoinhibition structure: be disposed with damping hole and spring eye on the loop of draining the oil of cylinder cavity end, junction between bigger damping hole and the less spring eye forms a step, cylinder cavity passes through damping hole successively, spring eye and oil cock and shoe cream room conducting, be equipped with the damping of slip motion in the damping hole, the periphery of damping and damping hole hole wall have certain spacing, form a valve port between the end face of damping and the described step, be shaped on draining hole that connects damping or the drain pan that is shaped on the perforation end face itself and contacting of spring on the end face in the damping; Other has a spring to place spring eye and forces in damping makes damping have the trend of past cylinder cavity direction motion.

Spacing between described damping periphery and the damping hole hole wall is the 0.1-1 millimeter.

Principle of work of the present invention is: less owing to oil pressure when unloaded, damping is pushed away valve port by spring force, in-oil cylinder fluid can be let out to spring eye in the spacing of the periphery of overdamping and damping hole hole wall relatively largely, flow to shoe cream room from spring eye, oil cock then, reach the function of quick decline; During load, because in-cylinder pressure is big, the stagnant of oil pressure when discharging and fluid made every effort to overcome the clothes spring force and promoted damping toward the motion of spring direction, until shutting valve port; Fluid in the oil cylinder can only go out by the draining orifice flow in the damping at this moment, perhaps releases in the drain pan of damping end face, owing to flow sharply reduces, so the motion of oil cylinder piston is forced to slow down the effect that has descended at a slow speed when having reached load.

The autoinhibition structure that the present invention adopts has been utilized the variation of load front and back oil pressure dexterously, can reduce dredge oil amount automatically when oil pressure increases in cylinder, has obtained the effect of load slow release, has guaranteed safe in utilization fully; Designed in addition structure is very simple again, not only is difficult for producing fault, and is durable in use, and easy to manufacture, and cost is also low.

Description of drawings

Fig. 1 is a main TV structure scheme drawing of the present invention.

Fig. 2 is a plan structure scheme drawing of the present invention.

Fig. 3 is that A-A among Fig. 2 is to the sectional structure scheme drawing.

Fig. 4, Fig. 5 are the B portion structure for amplifying scheme drawing among Fig. 3, represent the state that valve port opens and closes respectively.

Fig. 6 is that C-C among Fig. 3 is to the structure for amplifying scheme drawing.

Fig. 7 is that the master of another kind of damping structure of the present invention looks scheme drawing.

Fig. 8 is that scheme drawing is looked on the left side of another kind of damping structure of the present invention.

The specific embodiment

As shown in the figure, a kind of hydraulic jack oil pump loop of load slow release, comprise the oil cylinder 3 that is positioned on the frame, by the delivery line oil transportation with the oil pump 2 that orders about cylinder piston motion, drain the oil loop and the control of conducting oil cylinder and shoe cream room are drained the oil respectively, and (oil cock is opened for the oil cock 5 in loop, steel ball 7 retreats, and the loop of draining the oil is promptly by pipeline 6 and shoe cream room F conducting); Described loop and the cylinder cavity joint of draining the oil is provided with the autoinhibition structure; In this structure, on the loop of draining the oil of cylinder cavity end, be disposed with damping hole 11 and spring eye 16 that stepped appearance is arranged, junction between bigger damping hole and the less spring eye is a step, and cylinder cavity is successively by damping hole, spring eye, oil cock and pipeline 6 and shoe cream room F conducting; Be equipped with a damping 9 in the damping hole, the axial length of damping hole is greater than relaxation length, but thereby damping axial slip motion, the periphery of damping and damping hole hole wall have certain spacing, in-oil cylinder hydraulic oil is through described spacing, spring eye and oil cock inflow shoe cream room F; The end face of damping matches with described step and has formed a valve port, and valve port is closed and then can be cut off substantially from the oil circuit of described spacing process; Visible described step is a circular conical surface among Fig. 4, Fig. 5, and matched circular conical surface is also made at the corresponding contact position of damping end face; When the slippage of the past left side (oil cylinder direction) of damping, valve port is opened; And when the slippage of the past the right (spring direction) of damping, valve port is then closed.(on the end face or on the periphery) also is shaped on the draining hole 10 (Fig. 4, embodiment illustrated in fig. 5) that connects damping in the damping, and in-oil cylinder hydraulic oil also can release from this hole, and flows to shoe cream room F by spring eye; Perhaps be shaped on the drain pan 13 that connects end face (Fig. 7, shown in Figure 8 another embodiment) on the end face 12 itself and contacting of spring, make when described valve port is closed, still conducting of drain pan is (for keeping the drain pan conducting, this moment, step should not made circular conical surface), in-oil cylinder hydraulic oil still can release from drain pan by described spacing, and flows to shoe cream room F by spring eye.Other has a spring 8 to place spring eye and forces in the movement tendency that damping makes damping have past cylinder cavity direction, and the elastic force of this spring should be selected suitably, is usually slightly larger than unloaded oil pressure and gets final product.Certainly, the elastic force of spring is relevant with described spacing (spacing of the periphery of damping and damping hole hole wall), and generally speaking, spacing is big more, and elastic force should be more little; In general, the spacing between damping periphery and the damping hole hole wall is advisable for the 0.1-1 millimeter, and draining fast when guaranteeing zero load has the enough oil power that stagnates again during load.In addition, as shown in Figure 6: the chargine line of oil pump and the pipeline of draining the oil all are arranged on the end face of oil cylinder, and all sealed pad 15 of damping 9 in the steel ball 14 of chargine line and the damping hole (end of the pipeline of draining the oil) stops, so can not fall into cylinder cavity.

Also have among the figure: oil cylinder piston bar 4 (long and two-short dash line among Fig. 1 is represented piston rod 4 outward extending positions), press hand 1.

Claims

1, a kind of hydraulic jack oil pump loop of load slow release, comprise the oil cylinder (3) that is positioned on the frame, by the oil pump (2) of delivery line oil transportation to order about cylinder piston motion, the drain the oil oil cock (5) in loop of drain the oil loop and the control of conducting oil cylinder and shoe cream room respectively, it is characterized in that described loop and the cylinder cavity joint of draining the oil is provided with the autoinhibition structure: on the loop of draining the oil of cylinder cavity end, be disposed with damping hole (11) and spring eye (16), junction between bigger damping hole and the less spring eye forms a step, cylinder cavity passes through damping hole, spring eye and oil cock and shoe cream room (F) conducting, be equipped with the damping (9) of slip motion in the damping hole, the periphery of damping and damping hole hole wall have certain spacing, form a valve port between the end face of damping and the described step, be shaped on the draining hole (10) that connects damping in the damping; Other has a spring (8) to place spring eye and forces in damping makes damping have the trend of past cylinder cavity direction motion.

2, the hydraulic jack oil pump loop of a kind of load slow release according to claim 1 is characterized in that the spacing between described damping (9) periphery and damping hole (11) hole wall is the 0.1-1 millimeter.