JPS6132070B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to, for example, rock breaking work at a quarry, rock destruction work under the road surface in sewerage work, gas pipe work, etc., or concrete structures such as concrete breakwaters and concrete blocks. This invention relates to a hard material destruction device used for destruction work.

As this type of hard material destruction device, there has conventionally been one having the configuration described in the following [] and [], as shown in FIG.

[] The rigid cylindrical body 50 is provided with a piston rod 51 that can freely protrude and retract in its axial direction, and a cylinder chamber that can apply fluid pressure to the piston rod 51 in the protruding and retracting directions. 52 and 53 are formed.

[] A wedge-shaped member 54 is fixed to the tip of the piston rod 51, and an auxiliary cylindrical body 55 connected to the rigid cylindrical body 50 includes:
As the piston rod 51 comes into contact with the wedge-shaped member 54 that projects and moves integrally with the piston rod 51, the hard object breaking arm 56 is forcibly opened and swung in a direction substantially perpendicular to the axial direction. It is provided.

In such a conventional device, the arm 56 is inserted into the hole a previously drilled in the hard material A, and the piston rod 51 is moved to protrude, thereby utilizing the wedge action of the wedge-shaped member 54 to remove the hard material A. Compared to, for example, blasting with gunpowder or striking with breakers or steel balls to destroy hard materials, hard material destruction work minimizes pollution in terms of noise and vibration. Although it has the advantage of being safe, it has the following drawbacks.

That is, in order to cope with the depth of application of the destructive force of various hard materials, it is necessary to make the insertion length from the tip of the hard material destruction arm 56 to the end of the auxiliary cylindrical body 55 as long as possible. , the forward bending arm 56 on which a particularly strong bending force acts when it is made long like this.
In order to ensure the necessary mechanical strength of the arm 5,
6 and the wedge-shaped member 54, which not only makes the entire device very large and heavy, but also increases the diameter of the hole that must be drilled in the hard material in advance. It requires a lot of effort and time.

Therefore, since there is a limit to the insertion length of the arm 56 and the wedge-shaped member 54, the number of destruction operations inevitably increases, and the work efficiency is not sufficient.

The present invention has an object to improve the above-mentioned conventional drawbacks.

The hard material destruction device according to the present invention, which has been taken to achieve such an object, has a hard material destruction piston that is mounted on a rigid shaft-like body and is movable to protrude and retract in a direction perpendicular or substantially perpendicular to the axial direction of the rigid shaft. is established,
A flow path is formed in which fluid pressure can be applied to the piston in the direction of the protruding movement, and a means is provided for forcibly returning the piston to the retracted position.

The functions and effects of the above characteristic configuration are as follows.

<Operation> When destroying a hard object such as a rock or a concrete structure, the entire rigid shaft-like body 1 is inserted into a hole a previously drilled in the hard object A, as shown in FIG. 1 of the embodiment described later. By applying fluid pressure in the direction of protrusion movement to the piston 3 provided on this shaft-shaped body 1, the hard object is It can be destroyed effectively and efficiently.

<Effects> Therefore, since the insertion position of the rigid shaft-like body can be freely set in accordance with the depth of application of destructive force to various hard materials, the axial length and diameter can be reduced compared to conventional devices. It has become possible to reduce the number of destructive operations while making the size as small as possible, and it has become possible to improve work efficiency while making the device more compact and lightweight as a whole.

Hereinafter, embodiments of the configuration of the present invention will be described based on the drawings.

As shown in FIGS. 1 to 3, a hard material destruction device C that is detachably connected to a pressure oil (pressure fluid) generator B via a hydraulic hose H has a cross-sectional shape that is approximately circular. Holes 2 are formed at 10 locations equally spaced apart in the axial direction of a shaped metal shaft 1, each opening on one side in a direction perpendicular or substantially perpendicular to the axial direction, Inside each of these holes 2...
A piston 3 for destroying hard materials, which can freely protrude and retract in the direction of the hole axis, is inserted and held, and at a location of the shaft-shaped body 1 that is displaced in the opposite direction to the opening direction of the hole 2, A flow path 4 along the axial direction is formed on the inner end surface of each piston 3, which can simultaneously apply hydraulic pressure in the direction of protrusion movement.

When the pressure oil in the flow path 4 is discharged between the plug 5 screwed and fixed to the hole opening end of the shaft-like body 1 and the stepped portion 3a of the piston 3, respectively. , a spring 6 for forcibly returning the piston 3 to the retired position is interposed, and a circumferential groove 3b formed on the outer circumferential surface of each piston 3 is provided with a spring 6 for forcibly returning the piston 3 to the retired position. Shape 1...
An O-ring 7 that contacts the inner peripheral surface of the hole 2 is fitted and held therein.

The pressure oil generator B includes two types of hydraulic pumps P ₁ and P ₂ linked to an electric motor M, a relief valve V ₁ for switching from a high pressure state to a low pressure state, a check valve V ₂ , and a relief valve for circuit safety. V ₃ , a destructive action state in which pressure oil is supplied to the flow path 4 of the shaft-shaped body 1, a neutral state in which the supply and discharge of pressure oil to and from the flow path 4 is stopped, and a state in which the pressure oil in the flow path 4 is transferred to the tank T. It consists of a control valve _V4 that can be freely switched between a discharge state and a release state.

As shown in FIG. 1, when a hard object such as a rock or a concrete structure is to be destroyed, the shaft-like body 1 is inserted into a hole a drilled in the hard object A, and in this state, the When the valve V ₄ is operated to supply pressure oil to the flow path 4 of the shaft-like body 1, each of the pistons 3...
... is projected and moved against the elastic biasing force of the spring 6..., and the hard object A is moved by each of these pistons 3...
By strongly pressing the inner peripheral surface of the hole a, the property of the hard material A, which has a lower tensile strength than its compressive strength, is used to generate cracks in the hard material A and break it.

In the above-mentioned embodiment, ten pistons 3 were arranged in parallel in the axial direction of the shaft-like body 1;
It may be carried out by providing only 10 pieces, or it may be carried out by arranging a plurality of pieces other than 10 pieces in parallel.

Further, when a plurality of pistons 3 are arranged in parallel in the axial direction, the mounting pitches of the pistons 3 may be arranged at equal or unequal intervals, and may be set as appropriate depending on the usage conditions etc. good.

Furthermore, the pistons 3 may be provided at two circumferential locations on the shaft-like body 1, three circumferential locations as shown in FIG. 4, or four circumferential locations as shown in FIG. 5.

Furthermore, when a plurality of pistons 3 are arranged in parallel in the circumferential direction as described above, these pistons 3 may be arranged in a staggered manner in the axial direction.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the hard material destruction device according to the present invention, FIG. 1 is a schematic view showing the state of use, FIG. 2 is an enlarged partially cutaway side view of the main part, and FIG. 3 is a hydraulic circuit diagram of the main parts. FIGS. 4 and 5 are enlarged cross-sectional views of main parts showing different embodiments, respectively. FIG. 6 is a longitudinal sectional front view showing a conventional hard material destruction device. 1... Rigid shaft-like body, 3... Piston for destroying hard materials, 4... Channel.

Claims (1)

[Claims] 1. A rigid shaft-like body 1 is provided with a piston 3 for destroying hard materials that can freely project and retract in a direction perpendicular or substantially perpendicular to the axial direction of the rigid shaft-like body 1. A hard material destruction device that has a flow path 4 that can apply fluid pressure in the direction of protrusion movement, and is provided with means that can forcefully return the piston 3 to a retracted position. 2. The hard material destruction device according to claim 1, wherein the forced return means for the piston 3 is a spring 6. 3. The hard material destruction device according to claim 1, wherein the forced return means for the piton 3 is fluid pressure.