JPS62251501A - Hydraulic accumulator, hydraulic impact devide and pressure liquid accumulating method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic accumulator having an accumulator chamber whose boundary is at least partially interrupted by an elastic wall. The invention also relates to a hydraulic percussion device with such an accumulator.

This relates primarily to methods of accumulating pressurized liquid.

Hydraulic shocks in the form of rock drills, jackhammers and chisel hammers! ! Most of the parts have an accumulator, usually one
The accumulator is elastic in the form of a rubber group! , which separates the liquid solution from the nitrogen-filled chamber, so that the gas acts on the membrane as a spring. Such an accumulator leaking impact device is described in U.S. Pat.
? It is described in detail in the specification of Da Jr-TG.

Variations in the lifetime of such rubber membranes are often significant, and individual membrane compositions have extremely short lifetimes.

Another disadvantage lies in the fact that nitrogen must be added properly.

The liquid used in the actuation of the percussion device, usually a pressure oil, has a certain compressibility and is described in US Pat. No. 37, Part 1, discloses an impact device that takes advantage of this natural compressibility of liquids. There, the accumulator chamber has a large volume and is enclosed by steel walls. Often the accumulator chamber is
It cannot be made as large as desired.

It is an object of the invention to provide an accumulator that is simple, low friction, relatively small and suitable for use in percussion devices. This object is achieved by: II characterized in that the elastic wall consists of a matrix reinforced with 1/11 fibers.

Embodiments of the present invention will be described below with reference to the drawings.

A hydraulic percussion device in the form of a jackhammer as illustrated in FIG. 1 has a multi-part housing ii,
It comprises lobes, only one of which is shown and which are at an angle to each other (only one of which is designated by lλ).

The chisel-shaped power tool has a hexagonal handle 13, which is inserted into both parts of the housing l/ and is restrained there by a conventional chisel holder, not shown. The collar (not shown) of the chisel 13 provides support to the housing in the usual manner, and is used for spinning, tightening, and housing II.
≠Tamachibe≠; It can be transmitted to 13, and the chisel is limited to 4 in the housing IO! It has the IIIfh direction*. The nozzle 11 forms a cylinder for a lining 15 that is movable in multiple axial directions, and this lining 1
5 forms a cylinder for a hammer piston 16 that can move in the 1111ip direction within it. The hammer piston 16 is arranged to periodically impact the end face 17 of the chisel handle. The end face 7 thus forms a receiving surface for the hammer piston 16.

The housing has an inlet ig and an outlet l? for a pressure fluid, usually pressure oil. has. The inlet chamber-3 can be pressurized by a valve 1 controlled by a trigger-1. Between the lining, i.e., the cylinder 15 and the housing //,
A cylinder chamber λS exists, and a cylinder chamber roller exists between the cylinder Is and the hammer piston 16. cylinder lS
has the action of a valve, which alternately turns the cylinder chamber body between the cylinder IS and the hammer piston 16 into the inlet chamber λ3.
and exit chamber-g. Thus, cylinder 1
Both the hammer piston 5 and the hammer piston 1 reciprocate, and force is continuously applied between the cylinder 15 and the housing 710 and does not move, so the hammer piston operates as follows.
Housing//A shock drive system that does not cause VC vibration will not be described in detail, but one such shock drive system is disclosed in European Patent No. 1331,09.

Housing l/ is λ annular @, 30. ．． has 3/,
These annular walls are provided with grooves for seals 3, 33 (as clearly shown in the figures). Glass fiber reinforced plastic tubes 32.
33 and supported by the shoulder of the housing ll, ls, 3
6% J4C installed in the diagonal direction by 1a is
It should not be axially tightened and should preferably have some axial play with respect to the housing. An accumulator chamber 3 is formed in the inner layer of the tube 3da, which is permanently connected to the inlet chamber 3 by an aperture 3g. The tube Jl itself can thus be considered as part of the housing II. The accumulator chamber 3 and the tube J are both arranged around a part of the cylinder Is for the hammer piston groove and around a part of the cylinder for the cylinder Js. The cylinder for cylinder /3 is formed by the housing //.

The tube or cylinder 3da has a filament winding, for example of glass fiber, with a small pitch, and the matrix consists of a thermoset, for example epoxy or vinyl ester. Such tubes have a high linear strain tangential to the fatigue strength, a feature that achieves large accumulator capacities. Tube JII
(2) The wall thickness should be selected so that the operating pig stress is at a suitable level below the fatigue strength. Therefore, the accumulation capacity resulting from the compressibility of the hydraulic fluid is smaller than the accumulator capacity resulting from the elasticity of the tube, and its coefficient is less than 1 and less than 1/2? Emo naru. Thus, the elasticity of the tube wall constitutes a major part of the storage capacity.

The kidney can have an unreinforced wear-resistant resin or plastic outer cover.

The tube 3QIf14 can also have an unreinforced sealing layer of resin or plastic within it.

Both of these doves are probably not necessary and one or both can be omitted. These do not have to be the same resin material as the reinforced part of the tube wall, as an alternative to the inner layer mentioned above, the sealing rubber layer does not affect the effect of vulcanization on the inside of the wall. However, there is a danger that unwanted oil may be released from unsealed pipes.

The seals 3, 3 are sealed without the end of the tube 3 being tightened.
3, the tube is stressed relatively evenly and fatigue failure is avoided. Other methods of attaching the t217 can also be achieved, such as end clamping. The tube 3da can be formed by manufacturing it in a continuous manner and cutting it in a suitable manner.

A narrow pitch glass-fiber filament winding is considered desirable because it imparts a very high strain on the fatigue strength to the tube. The distortion exceeds O0λSt-, even o,sts. Any other material having this property can be used instead.

In place of the third protective layer, another tube can be placed outside the tube and at a distance from it.

The elastic wall of the accumulator is a tube J4 with a circular cross section
It is shown as I. Such a design appears desirable. However, the elastic wall can also have another shape. This can be, for example, a circular plate bounded by the circumference of the tube, or it can be in the form of a bubble, for example a sphere.

In the nine percussion devices described above, the accumulator is continuously coupled to the inlet tX, so that it is continuously pressurized during operation, reducing periodic pressure fluctuations at the inlet. Above mentioned 91. The shock! type of accumulator also includes an accumulator that is alternately coupled to a source and an outlet! ! It can also be used in impact devices, for example of the type described in US Pat.

[Brief explanation of drawings]

tli is a longitudinal sectional view of a hydraulic jackhammer according to the invention. The figure shows an enlarged version of the seal shown in the figure. In the drawing, 1 and /3 are cylinders, /6 is a hammer piston, / is a receiving member, 30 and 37 are mounting walls, and 3 and 3 are
3 is a sealing ring or annular seal, 34I is an elastic band, and 37 is an accumulator chamber. Procedural amendment (method) May 30, 1985

Claims (1)

[Claims] 1. A hydraulic accumulator including an accumulator chamber whose boundary is at least partially constituted by an elastic wall,
A hydraulic accumulator characterized in that the elastic wall consists of a matrix reinforced with fibers. 2. The hydraulic accumulator according to claim 1, wherein the base material is made of a thermosetting material. 3. A hydraulic accumulator according to claim 1 or 2, wherein the fiber reinforcement consists of filament windings. 4. The hydraulic accumulator according to any one of claims 1 to 3, wherein the fiber reinforcement is made of glass fiber. 5. Any one of claims 1 to 4, wherein the elastic wall consists of a tube forming part of the boundary of the accumulator chamber, which tube is supported at the end wall by a sealing ring. Hydraulic accumulator according to item 1. 6. A hydraulic accumulator including an accumulator chamber with at least a part of the boundary formed by an elastic wall,
Hydraulic accumulator, characterized in that the elastic wall consists of a tube forming part of the boundary of the accumulator chamber, which tube is supported at the end wall by an annular seal. 7. The hydraulic accumulator of claim 6, wherein the seal is a lip sealing ring. 8. A cylinder, a hammer piston capable of reciprocating within the cylinder to repeatedly impact a receiving member connected to a working tool, and a hydraulic accumulator whose boundary is at least partially constituted by an elastic wall. A hydraulic impact device characterized in that the elastic wall is made of a matrix reinforced with fibers. 9. Claim in which the elastic wall consists of a tube forming part of the boundary of the accumulator chamber, which tube is supported by an annular seal at the end wall and is arranged around at least a part of the cylinder. The hydraulic impact device according to item 8. 10. A hydraulic accumulator having an accumulator chamber with at least a part of the boundary formed by an elastic wall, the elastic wall consisting of a tube forming a part of the boundary of the accumulator chamber, the tube having an annular shape at the end wall. Hydraulic accumulator, characterized in that it is supported by a seal and is arranged around at least a portion of a cylinder. 11. A method of accumulating pressure fluids with fluctuating pressures using an accumulator chamber with elastic walls, such that the elastic tension and inherent forces of the elastic walls themselves constitute the main part of the storage capacity. A pressure liquid accumulation method characterized by the use of a combination of elastic walls.