CN201330768Y

CN201330768Y - Floating type cushioning device for hydraulic cylinder

Info

Publication number: CN201330768Y
Application number: CNU200820204897XU
Authority: CN
Inventors: 樊桂萍; 唐建光; 黄智武
Original assignee: SHAOGUAN HYDRAULIC PLANT CO Ltd
Current assignee: SHAOGUAN HYDRAULIC PLANT CO Ltd
Priority date: 2008-12-05
Filing date: 2008-12-05
Publication date: 2009-10-21
Anticipated expiration: 2018-12-05

Abstract

The utility model relates to a floating type cushioning device for hydraulic cylinder, which comprises a cylinder bottom and a piston, wherein a cushioning sleeve is fixedly arranged on the end of the piston, a floating sleeve is fixedly arranged on a mounting hole of the cylinder bottom, a floating gap is left between an excircle of the floating sleeve and the cylinder bottom, and an 'O'-shaped ring with big line-width is arranged in the direction of the excircle of the floating sleeve. The floating sleeve is adopted to construct a cushioning hole, the quantitative floating gap exists between the excircle of the floating sleeve and the mounting hole of the cylinder bottom, and a floating ring is automatically centered through the compression change of the 'O'-shaped ring itself, the floating ring can move in the axial direction, when the cushioning sleeve of a hydraulic cylinder enters a cushioning stroke, the cushioning sleeve is smoothly guided into the cushioning hole through a big taper surface of the front section, even different axial degrees exist between the cushioning sleeve and the cushioning hole, and the cushioning sleeve can be adjusted and modified through the floating function of the 'O'-shaped ring, thereby realizing the cushioning function and overcoming the negative effects to the cushioning mechanism.

Description

The floating-type cushion device that oil hydraulic cylinder is used

[technical field]

The utility model belongs to the hydraulics field, relates to the floating-type cushion device that a kind of oil hydraulic cylinder of taking a newly-increased floating bushing to construct cushion hole is used.

[background technique]

Mechanical automation is one of direction of modern mechanical development, and hydraulics is to realize the technical foundation of mechanical automation.Over nearly 20 years, domestic metallurgy industry heavy-duty is rapidly developed, and oil hydraulic cylinder has also obtained fast development as the basic power unit of power unit in the hydraulic unit.For satisfying this technological trend requirement of heavy-duty, ((application of the oil hydraulic cylinder of stroke 〉=5000mm) also gets more and more big cylinder diameter for cylinder diameter 〉=500mm), long stroke.Service condition requirement according to reality, many oil hydraulic cylinders require to adopt damping device at the stroke terminal part, purpose is to eliminate the piston and the mechanical impact between the cylinder head cylinder bottom that inertial force and hydraulic coupling because of piston rod are caused, simultaneously also in order to reduce the noise that piston liquid when the change moving direction sends.

The working principle of damping device is in the segment distance before the piston arrives stroke terminal, part or all of managing the oil-discharging cavity inner fluid is closed, make it pass through throttling pore or slit discharge, thereby making the fluid that is closed produce suitable compensator or trimmer pressure acts on the oil extraction side of piston, resist mutually with the inertial force of piston, to reach the purpose of retarding braking.For general traditional design, though damping device is of a great variety, its essence all is to increase by one section fitting surface before and after piston, plays cushion stroke.But big cylinder diameter, long stroke hydraulic cylinder for the level installation; because the huge weight of piston rod and piston; regular meeting rises and causes the heavy wear of director element near ground one side in the process of operation; cause producing between piston and the cylinder barrel huge radial disbalance; be reflected on the buffer element; be exactly to produce great malalignment between cushion collar and the cushion hole; may cause cushion collar not enter cushion hole like this or make cushioning the serious garland wearing and tearing of fitting surface; cause cushioning ineffective, even also can cause the serious mechanical failure of equipment.

[model utility content]

In order to overcome the above-mentioned shortcoming of prior art, the floating-type cushion device that the utility model provides the big cylinder diameter of a kind of energy solution level installation, long stroke hydraulic cylinder to cause the oil hydraulic cylinder of the various kinds of equipment fault that the great malalignment of generation causes between cushion collar and the cushion hole to be used because of the director element wearing and tearing.

The technological scheme that its technical problem that solves the utility model adopts is: the floating-type cushion device that a kind of oil hydraulic cylinder is used, comprise cylinder bottom and piston, end at described piston is fixed with cushion collar, the place is fixed with floating bushing at described cylinder bottom mounting hole, leave flying height between the mounting hole of floating bushing cylindrical and cylinder bottom, the round section joint ring in a big line footpath is installed on the circular direction outside floating bushing.

The internal diameter of described floating bushing is greater than the external diameter of cushion collar.

Side oil port at described cylinder bottom is equipped with one-way valve, and this one-way valve is fixed on the cylinder bottom by nut.

Below the opposite side of described cylinder bottom throttle valve is housed, this throttle valve is fixedly mounted on the cylinder bottom.

The beneficial effects of the utility model are: take floating bushing to construct cushion hole, a certain amount of flying height that exists between the mounting hole of floating bushing cylindrical and cylinder bottom, the round section joint ring in a big line footpath is installed on the circular direction outside floating bushing, compression variation by round section joint ring self makes the floating ring automatic centering, floating ring can carry out moving of some axial directions, like this when the oil hydraulic cylinder cushion collar enters cushion stroke, cushion collar just imports in the cushion hole of floating bushing smoothly by the big tapering face of leading portion, even have malalignment between cushion collar and the cushion hole, also can regulate and revise by the float function of round section joint ring, meanwhile, floating bushing is under the promotion of being sealed up for safekeeping fluid, the fitting surface in floating bushing left side is fitted on the step surface at cylinder bottom place fully, has realized that promptly buffer function overcomes the negative effect to damping mechanism again.

[description of drawings]

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the partial enlarged drawing of A part among Fig. 1.

Among the figure: 1-piston ,-2-one-way valve, 3-cylinder bottom, 4-nut, 5-cushion collar, 6-floating bushing, 7-round section joint ring, 8-throttle valve, 9-hydraulic fluid port, 10-cylinder body.

[embodiment]

Below in conjunction with drawings and Examples the utility model is further specified:

Referring to Fig. 1 and Fig. 2, the floating-type cushion device that a kind of oil hydraulic cylinder is used comprises the cylinder body 10 of oil hydraulic cylinder being fixed with cushion collar 5 in the end of described cylinder body 10 inner carriers 1, cylinder bottom 3 mounting hole places at described cylinder body 10 are fixed with floating bushing 6, and the internal diameter of described floating bushing 6 is greater than the external diameter of cushion collar; Leave flying height between the mounting hole of floating bushing 6 cylindricals and cylinder bottom 3, the round section joint ring 7 in a big line footpath is installed on the circular direction outside floating bushing 6.One-way valve is equipped with at a side hydraulic fluid port 9 places at described cylinder bottom 3, and this one-way valve 2 is fixed on the cylinder bottom 3 by nut 4; Throttle valve 8 is housed below the opposite side of described cylinder bottom 3.When piston 1 and piston rod the time to left movement, because huge weight, produce great inertial force, piston 1 that is caused for inertial force and the hydraulic coupling of eliminating because of piston 1 and the mechanical impact between the cylinder bottom 3, damping device of the present utility model plays a role with regard to beginning: the conical surface of cushion collar 5 leading portions imports in the cushion hole in the floating bushing 6 it smoothly, and round section joint ring 7 just can remedy and revise the malalignment between the cushion hole of cushion collar 5 and floating bushing 6 by the decrement of self, the left surface of floating bushing 6 by the fluid punching press on the step surface of cylinder bottom 3, like this at cushion collar 5, floating bushing 6, under the acting in conjunction of cylinder bottom 3 and round section joint ring 7, fluid is just sealed up for safekeeping in the oil-discharging cavity between cylinder bottom 3 and piston 1, flow out by the throttling pore that is installed in the throttle valve 8 on the cylinder bottom 3 again, by the damping function of aperture, the power of the retarding braking that inertial force contended with when making fluid in the oil-discharging cavity produce with piston 1 and piston rod operation; When piston 1 needed again operation, the fluid that the hydraulic fluid port 9 of cylinder bottom 3 is provided then can be filled into rodless cavity smoothly by the aperture on one-way valve 2 and the floating bushing 6, thereby reduces the breakout pressure of piston 1, starts rapidly.

Claims

1, the floating-type cushion device used of a kind of oil hydraulic cylinder, comprise cylinder bottom and piston, end at described piston is fixed with cushion collar, it is characterized in that: the place is fixed with floating bushing at described cylinder bottom mounting hole, leave flying height between the mounting hole of floating bushing cylindrical and cylinder bottom, the round section joint ring in a big line footpath is installed on the circular direction outside floating bushing.

2, the floating-type cushion device used of oil hydraulic cylinder as claimed in claim 1, it is characterized in that: the internal diameter of described floating bushing is greater than the external diameter of cushion collar.

3, the floating-type cushion device used of oil hydraulic cylinder as claimed in claim 1, it is characterized in that: the side oil port at described cylinder bottom is equipped with one-way valve, and this one-way valve is fixed on the cylinder bottom by nut.

4, the floating-type cushion device of using as claim 1 or 3 described oil hydraulic cylinders, it is characterized in that: below the opposite side of described cylinder bottom throttle valve is housed, this throttle valve is fixedly mounted on the cylinder bottom.