CN203614510U

CN203614510U - Hydraulic buffering oil cylinder

Info

Publication number: CN203614510U
Application number: CN201320831737.9U
Authority: CN
Inventors: 虞尚均
Original assignee: LUZHOU LONGMATAN DISTRICT CHANGJIANG HYDRAULIC COMPONENT Co Ltd
Current assignee: LUZHOU LONGMATAN DISTRICT CHANGJIANG HYDRAULIC COMPONENT Co Ltd
Priority date: 2013-12-17
Filing date: 2013-12-17
Publication date: 2014-05-28
Anticipated expiration: 2023-12-17

Abstract

The utility model discloses a hydraulic buffering oil cylinder comprising a cylinder body, a guide sleeve, an end cover, a piston rod and a piston, wherein the piston is fixedly connected to the piston rod; a rod cavity oil port is formed in the cylinder body and the guide sleeve. The hydraulic buffering oil cylinder is characterized in that a step is arranged on the piston rod; a floating buffering sleeve is arranged at the position, between the piston and the step, of the piston rod; the floating buffering sleeve is in clearance fit with the piston rod in the radial direction and the piston in the axial direction; a conical surface is arranged at one end, adjacent to the guide sleeve, of the floating buffering sleeve; the guide sleeve is internally provided with an axial buffering hole for communicating the inner cavity of the cylinder body and the rod cavity oil port; the inner diameter of the buffering hole is greater than the greatest outer diameter of the floating buffering sleeve. The hydraulic buffering oil cylinder not only has the advantages of being large in effective buffering area and good in buffering effect, but also can prevent parts from being strained and prolong the service life.

Description

A kind of buffering hydraulic oil cylinder

Technical field

The utility model relates to a kind of hydraulic jack with damping device.

Background technique

The piston rod of hydraulic jack has certain quality, under the driving of pressure, when particularly hydraulic jack is vertically installed, when motion, there is very large energy (speed is larger, and energy is larger), enter stroke terminal at piston, can cause mechanical collision, produce very large impact force and noise.Therefore usually need to adopt damping device, to avoid this mechanical collision, reduce surge pressure, make operation mechanism's motion that more tends to be steady; The motion that tends to be steady of Yao Shi operation mechanism, need allow rod chamber (loculus) fluid be heat energy by certain stroke throttling kinetic transformation, and by the fluid circulating, heat energy is taken to outside hydraulic jack.

The buffer unit structure of conventional hydraulic oil cylinder mainly contains two kinds, the first, the outer rim place that relies on rod chamber side at piston designs an annular groove, rely on outer rim place design one annular boss matching with pistion recess of rod chamber side at guide sleeve, when hydraulic jack work, realize buffering object by the relative movement of pistion recess and guide sleeve boss; But this structure is owing to will guaranteeing the intensity of guide sleeve boss, so the size design of boss is larger, thereby buffering useful area is less, is unfavorable for improving shock-absorbing capacity; Meanwhile, in the time that diameter of piston rod is larger (when hydraulic jack speed ratio is greater than 2), due to intensity reason, is difficult to design groove and on guide sleeve, designs boss on piston, thereby cannot realize rod chamber buffering at all; The second, on piston rod, be provided with cushion collar, cushion collar is positioned at rod chamber, on guide sleeve inner cylindrical surface, offer the circular groove being communicated with loculus, the external diameter of cushion collar is less than the diameter of circular groove, the inner side tail end of circular groove offers loculus hydraulic fluid port, concentric but the cushion collar of this structure can not be adjusted automatically with cushion hole, is easily pulled.

Model utility content

The purpose of this utility model is for prior art above shortcomings, and a kind of buffering hydraulic oil cylinder is provided, and it not only has advantages of, and buffering useful area is larger, good buffer effect, and can peventing member be pulled, and increases the service life.

For achieving the above object, a kind of buffering hydraulic oil cylinder of the present utility model, comprise cylinder body, guide sleeve, end cap, piston rod and be fixed on the piston on piston rod, in cylinder body and guide sleeve, be provided with rod chamber hydraulic fluid port, it is characterized in that being provided with step on piston rod, on the piston rod between piston and step, be provided with floating buffer cover, floating buffer cover radially and with piston is axially all being Spielpassung with piston rod, one end at the contiguous guide sleeve of floating buffer cover is provided with the conical surface, in guide sleeve, be provided with the axial cushion hole that is communicated with inner chamber of cylinder block and its rod chamber hydraulic fluid port, the internal diameter of cushion hole is greater than the maximum outside diameter of floating buffer cover.

When piston is stressed mobile, floating buffer cover while just having entered cushion hole, on the conical surface of floating buffer cover, set up certain pressure due to the formation of throttling, floating buffer is locked to be pressed against and on piston end surface, forms end face seal, at this moment fluid cannot pass through the oil return of cushion collar internal void, at this moment floating buffer is enclosed within cushion hole to move to carry out fluid throttling is heat energy kinetic transformation, and heat energy is taken to outside hydraulic jack by the fluid that circulates; In the time that piston approaches stroke end, speed will have been descended much, this be floating buffer cover be positioned at cushion hole a side group this without pressure, fluid can, by the floating buffer cover end face adjacent with piston, again by the oil return of cushion collar endoporus gap portion, be had suffered buffering end; Surge volume of the present utility model enlarges markedly, and can realize that velocity of piston is more effective successively decreases, and the impact that piston is subject to is less, noise is less, operation mechanism's motion that more tends to be steady, and solved in the time that large diameter of piston rod is larger, cannot adopt traditional damping device to carry out the defect of loculus buffering; Simultaneously the conical surface of floating buffer cover one end can be realized automatically concentric with cushion hole, avoids the problem of pulling;

As further improvement of the utility model, on cylinder body, be provided with rodless cavity hydraulic fluid port; Become buffering double-act-ing hydraulic J-Horner;

In sum, the utility model not only has advantages of that buffering useful area is larger, good buffer effect, and can peventing member be pulled, and increases the service life.

Accompanying drawing explanation

Fig. 1 is the utility model embodiment's plan view.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail.

As shown in Figure 1, this buffering hydraulic oil cylinder, comprise cylinder body 1, guide sleeve 2, end cap 3, piston rod 4 and be fixed on the piston 5 on piston rod 4, in cylinder body 1 and guide sleeve 2, be provided with rod chamber hydraulic fluid port 6, in cylinder body 1, be provided with rodless cavity hydraulic fluid port 7, on piston rod 4, be provided with step, on the piston rod 4 between piston 5 and step, be provided with floating buffer cover 8, floating buffer cover 8 radially and with piston 5 is axially all being Spielpassung with piston rod 4, gap is between 0.5-1mm, one end at floating buffer cover 8 contiguous guide sleeves 2 is provided with conical surface 8a, in guide sleeve 2, be provided with the axial cushion hole 9 that is communicated with inner chamber of cylinder block and its rod chamber hydraulic fluid port 6, the internal diameter of cushion hole 9 is greater than the maximum outside diameter of floating buffer cover 8.

Move when piston 5 is subject to pressure in rodless cavity, floating buffer cover 8 has been while just having entered cushion hole 9, on the conical surface 8a of floating buffer cover 8, set up certain pressure due to the formation of throttling, floating buffer cover 8 is pressed to lean against on piston 5 end faces and form end face seal, at this moment fluid cannot pass through cushion collar 8 internal void oil returns, at this moment to carry out fluid throttling in cushion hole 9 motions be heat energy kinetic transformation to floating buffer cover 8, and heat energy is taken to outside hydraulic jack by the fluid that circulates; In the time that piston 5 approaches stroke end, speed will have been descended much, this be floating buffer cover 8 be positioned at cushion hole 9 a side group this without pressure, fluid can overlap 8 end faces adjacent with piston 5 by floating buffer, again by the oil return of cushion collar endoporus gap portion, has suffered buffering end; Surge volume of the present utility model enlarges markedly, and can realize that velocity of piston is more effective successively decreases, and the impact that piston 5 is subject to is less, noise is less, operation mechanism's motion that more tends to be steady, and solved in the time that large diameter of piston rod is larger, cannot adopt traditional damping device to carry out the defect of loculus buffering; The conical surface 8a that simultaneously floating buffer overlaps 8 one end can realize automatically concentric with cushion hole 9, avoids the problem of pulling.

Claims

1. a buffering hydraulic oil cylinder, comprise cylinder body, guide sleeve, end cap, piston rod and be fixed on the piston on piston rod, in cylinder body and guide sleeve, be provided with rod chamber hydraulic fluid port, it is characterized in that being provided with step on piston rod, on the piston rod between piston and step, be provided with floating buffer cover, floating buffer cover radially and with piston is axially all being Spielpassung with piston rod, one end at the contiguous guide sleeve of floating buffer cover is provided with the conical surface, in guide sleeve, be provided with the axial cushion hole that is communicated with inner chamber of cylinder block and its rod chamber hydraulic fluid port, the internal diameter of cushion hole is greater than the maximum outside diameter of floating buffer cover.

2. a kind of buffering hydraulic oil cylinder as claimed in claim 1, is characterized in that being provided with rodless cavity hydraulic fluid port on cylinder body.