JPS61229092A - Rod change apparatus for rock driller - 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] (Industrial Application Field) The present invention provides a method for adding a connecting rod to a rock drill,
This invention relates to a rod change device that performs recovery.

(Prior art) Generally, in a rock drill, a rod is connected to the shank lock V of the rock drill via a coupling, and a bit is attached to the tip of the rod. A blow and rotation are applied to the bit through these couplings and rods, and the bit is used to strike rocks and drill holes.

When drilling a deeper hole in the rock, connect the connecting rods one after another via a coupling between the shank rod and the rod to which the bit is attached, until the bit reaches the desired depth. I'm trying to reach it.

When the drilling operation of the deep hole is completed, the connecting rod is recovered.

To perform this recovery work, first pull up one connecting rod and clamp the coupling at the front end of that rod with a centralizer to prevent the rod connected to the tip of the connecting rod to be recovered from falling. Do it like this.

Thereafter, the connecting rod is removed from the coupling clamped by the centralizer, and then the rear end side is removed from the shank rod together with the coupling. The connecting rod thus removed is stored in a predetermined storage location.

On the contrary, when adding a connecting rod, prepare a connecting rod with a coupling connected to its rear end, connect its tip to the coupling clamped by the centralizer, and connect the rear end to the coupling that is clamped by the centralizer. This is done by connecting to the shank rod via a coupling.

As a rod change device for adding or recovering connecting rods, the
As described in Japanese Patent No. 8-165089, there is a device that has two clampers and uses these clampers to recover the connecting rod.

In the recovery operation using two clampers, first, the connecting rod is held rotatably by both clampers to prevent it from falling, and in this state, the shank rod is rotated in the opposite direction to remove the coupling held by the centralizer. Separate the front end of the connecting rod from the

Next, use both clampers to hold the connecting rod and the coupling at the rear end so that they cannot rotate, and in this state, rotate the shank rod in the opposite direction to separate the shank rod and the coupling at the rear end. .

In this way, in the rod recovery operation, the connecting rod must be held rotatably and also held in a non-rotatable state.

To this end, as described in the above publication, the clamper is equipped with a hydraulic cylinder for forming a holding state and a hydraulic cylinder for forming a gripping state.

Therefore, in a device having a plurality of clamper driving cylinders, the clamper itself cannot be made smaller and lighter, and there is a problem in that the manufacturing cost becomes high.

Further, if the hydraulic circuit for driving each cylinder is not appropriately determined, there is a problem that the number of operations of the clamper increases or the number of levers to be operated increases, resulting in poor operability.

(Object of the Invention) The present invention was made in order to solve the above-mentioned conventional problems, and an object of the present invention is to provide a rod change device having a ramper that can be driven by two hydraulic cylinders.

(Structure of the Invention) For this reason, the present invention provides a first pressure oil chamber and a second pressure oil chamber formed inside the cylinder by a piston that is movably fitted into the cylinder, and a first pressure oil chamber and a second pressure oil chamber that protrude from the piston to the outside of the cylinder. a piston rod connected to one of the gripping pieces,
The cylinder body is formed in the casing by a gripping piece driving member connected to a local gripping piece, and a piston member movably fitted inside the casing, and communicates with the first pressure oil chamber. A reservoir chamber capable of storing a certain amount of oil sent from the chamber is connected to an oil tank and a hydraulic power source, and when the reservoir chamber is connected to the hydraulic power source, the piston member is moved toward the reservoir chamber, and the oil in the reservoir chamber is A metering valve having an oil supply chamber that sends oil to the pressure oil chamber, communicates the second pressure oil chamber with the oil pressure source, communicates the first pressure oil chamber with the oil tank, and connects the oil pressure source to the second pressure oil chamber. By moving the piston toward the first pressure oil chamber with the supplied pressure oil, a part of the oil in the first pressure oil chamber is sent to the storage chamber, and the other oil is returned to the oil tank. A holding positive silane that isolates the pressure oil chamber from the oil tank, communicates the second pressure oil chamber with the oil tank, and communicates the oil supply chamber of the metering valve with the oil pressure source, and connects the first pressure oil chamber and the oil pressure source. The second pressure oil chamber and the oil tank are communicated with each other, and the oil supply chamber of the metering valve is communicated with the oil tank. A flow path switching valve having an open position that returns the oil in the second pressure oil chamber to the oil tank by moving toward the pressure oil chamber side.

Therefore, when the flow path switching valve is switched to the gripping position, the piston of the gripping piece driving member is moved to the first pressure oil chamber side by the pressure oil of the hydraulic source, and the gripping piece operates to grip, and when the flow path switching valve is switched to the holding position, the metering valve is The oil in the storage chamber is sent to the second pressure oil chamber, the piston of the gripping piece driving member moves to the second pressure oil chamber side, the gripping piece operates to hold, and when it is switched to the open position, it is gripped by pressure oil from the hydraulic source. The piston of the one-side drive member moves toward the second pressure oil chamber, and the gripping piece comes to open.

(Effects of the Invention) According to the present invention, the action of the metering valve makes it possible to grip, hold, and release the rod by - number of hydraulic cylinders (grip piece drive members). It can be made lighter and the manufacturing cost can also be kept low.

Furthermore, compared to the case where a plurality of hydraulic cylinders (grip piece drive members) are drive-controlled, the operation becomes easier, so the operability of the device is improved.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows the hydraulic circuit of the rod change device of the first embodiment.

In FIG. 1, 1 is a hydraulic pump, and 2 is a hydraulic cylinder (gripping piece driving member) that drives the gripping pieces 51 and 52 of the clamper 50 shown in FIG.

Reference numeral 3 denotes a flow path switching valve, which has three positions 3a, 3b, and 3c: gripping, holding, and opening.Switching control of this valve 3 is performed by, for example, a solenoid valve.

Further, 4 is a metering valve capable of storing a certain amount of pressure oil.

In the hydraulic cylinder 2, a first pressure oil chamber 7a and a second pressure oil chamber 7b are formed by a piston 6 that is movably fitted into the inside of the cylinder body 5. One gripping piece 51 is connected to the protruding piston rod 8, and the other gripping piece 52 is connected to the cylinder body 5.

As shown in FIG.
3 is disposed on the side of the guide cell 54 on which the clamper 50 is mounted, and a rod storage portion 55, which is also disposed in the guide cell 54, is located below the clamper 50.

The main body of the clamper 50 is rotatable around a point P between the positions shown by the solid line and the dashed line in the figure.

At the tip of the clamper 50, the pair of gripping pieces 51 and 52 are arranged facing each other, and each gripping piece 51, 52 is
The central portion is rotatably supported on the shafts 56 and 57, and the base end portions are respectively attached to the piston rod 8 and the cylinder body 5 on the shafts 5.
It is rotatably connected at 8.59.

Therefore, each gripping piece 51 .
The distal ends of the connecting rods 52 are positioned close to or apart from each other, and are configured to grip the connecting rod 60 in a non-rotatable state, to hold it rotatably, or to release it.

On the other hand, as shown in detail in FIG. 2, the metering valve 4 includes a cylindrical casing 10 with a bottom, and a feeding port 1 (I) is provided at the bottom 10a of the casing 10. A spacer 12 having a feeding port 12a is screwed into the opening 10c and fastened with a nut 13.

A piston member 14 is movably fitted inside the casing 10, and the spacer 12 is moved by the piston member 14.
A storage chamber 15a is formed in an opening with the bottom part 10a, and an oil supply chamber 15b is formed in an opening with the bottom part 10a.A coil spring 16 is compressed between the spacer 12 and the piston member 14, and the piston member 14 is biased toward the oil supply chamber 15b.

The spacer 12 can be adjusted by adjusting the screwing position to adjust the amount S of movement of the piston member 14 toward the storage chamber 15a, that is, the storage amount.

The feed port 12a is connected to the first pressure oil chamber 7a of the hydraulic cylinder 2.
The oil sent from the first pressure oil chamber 7a is stored in the storage chamber 15a by a certain amount corresponding to the amount of movement S.

The feed port 10b is connected to the oil tank 1 via the flow path switching valve 3.
7 can be communicated with the hydraulic pump 1, and when communicated with the hydraulic pump 1, the piston members l and t are moved into the storage chamber ISa by pressure oil.
By moving it to the side, the oil in the storage chamber 15a is sent to the first pressure oil chamber 7a.

Returning to FIG. 1, in the gripping position 3a, the flow path switching valve 3 allows the second pressure oil chamber 7b and the hydraulic pump 1 to communicate with each other, and communicates the first pressure oil chamber 7a with the oil tank 17, The oil supply chamber 15b and the oil tank 17 are communicated with each other.

Moreover, in the holding position 3b, the first pressure oil chamber 7a and the oil tank 17 are cut off, the second pressure oil chamber 7b and the oil tank 17 are communicated, and the oil supply chamber 15b and the hydraulic pump 1 are communicated with each other.

Furthermore, in the open position 3c, the first pressure oil chamber 7a and the hydraulic pump 1 are communicated with each other, and the second pressure oil chamber 7b and the oil tank 1 are communicated with each other.
7, and the oil supply chamber 15b and oil tank 17 are connected to Mi
Let me be.

The second pressure oil chamber 7b of the hydraulic cylinder 2 is communicated with the oil tank 17 via a check valve 19 with biloft, and the check valve 19 pilots the pressure oil supplied to the oil supply chamber 15b of the metering valve 4. It is designed to open as a signal.

The operation of the rod chain device constructed as described above will now be described.

First, when the flow path switching valve 3 is switched to the gripping position 3a, the pressure oil discharged from the hydraulic pump 1 is supplied to the second pressure oil chamber 7b of the hydraulic cylinder 2, and the piston 6 or the first pressure oil chamber 7 is
By moving to the a side, part of the oil in the first pressure oil chamber 7a is fed into the storage chamber 15a of the metering valve 4 through the inlet 12a, and the remaining oil is returned to the oil tank 17.

As a result, each gripping piece 51 , 52 approaches each other and grips the connecting rod 60 .

Next, when the flow path switching valve 3 is switched to the holding boss 3b, the pressure oil discharged from the hydraulic pump 1 is transferred to the check valve 1.
9 to open one check valve and open the supply/discharge port 1.
0b to the oil supply chamber 1511 of the metering valve 4, and the piston member 14 moves toward the storage chamber 15a. ),
The oil in the storage chamber 15a is sent to the first pressure oil chamber 7a, and the piston 6 moves toward the second pressure oil chamber 7b, so that the oil in the second pressure oil chamber 7b flows through the check valve 19. It is returned to tank 17.

Thereby, each gripping piece 51 , 52 holds the connecting rod 60 with a slight separation.

Furthermore, when the flow path switching valve 3 is switched to the open position 3c, the pressure oil discharged from the hydraulic pipe 1 is transferred to the hydraulic cylinder 2.
When the piston 6 moves toward the second pressure oil chamber 7b, the oil in the second pressure oil chamber 7b is returned to the oil tank 17.

As a result, the respective gripping pieces 51 and 52 are further separated, and the connecting rod 60 is opened.

FIG. 3 shows a hydraulic circuit of the rod chaining device of the second embodiment, which supplies pressure oil evenly to a rod clamp hydraulic cylinder 2A and a sleeve clamp hydraulic cylinder 2B, which are linked together.

It is basically the same as the hydraulic circuit of the first embodiment, or
As shown in the figure, the supply port 1 of the spacer 12 of the metering valve 34
2a is branched into two, and the discharge flow rate from each branch port 12b, 12c can be adjusted by changing the biasing force of the valves 22, 22 by the springs 2, 21 by adjusting the forward and backward movement of the adjusting screws 20, 20. I have to.

FIG. 5 shows a metering valve 4 according to a modification of the metering valve 34 in FIG.
4, two metering valves 4 shown in Fig. 2 are provided, and each cylinder io
, io, and has a structure in which the bottom parts 10a, 10a of the bottom part 10a are joined together, and the feeding port 10b of the bottom part 10a is branched into two, each branching port 10c.

10d is communicated with each oil supply chamber 15b.

In this case, the discharge flow rate from each of the feed ports 12a, 12a can be adjusted by moving the piston member 14 toward the storage chamber 15a by adjusting the screwing position of the spacer 12, as in the first embodiment. This is done by adjusting the amount S.

[Brief explanation of the drawing]

Fig. 1 is a hydraulic circuit diagram of the first embodiment, Fig. 2 is a sectional view of a metering valve in the circuit of the first embodiment, Fig. 3 is a hydraulic circuit diagram of the second embodiment, and Fig. 4 is a hydraulic circuit diagram of the second embodiment. FIG. 5 is a sectional view showing a modification of the metering valve in the circuit of the second embodiment, and FIG. 6 is a side view of the clamper. DESCRIPTION OF SYMBOLS 1... Hydraulic pump (hydraulic source), 2... Hydraulic cylinder (gripping piece drive member), 3... Flow path switching valve, 4, 34.44... Metering valve, 6...
・Piston, 7a...first pressure oil chamber, 7b...
・Second pressure oil chamber, 8...Piston rod, 10...
・Casing, 14...Piston member, 15a・
... Storage chamber, 15b... Oil supply chamber, 17... Oil tank, 19... Check valve, 50... Clamper, 51.52... Gripping piece.

Claims (1)

[Claims] (1) It has a clamper whose gripping piece is driven and controlled in three stages: gripping, holding, and releasing the connecting rod, and the clamper is used to add and retrieve the connecting rod to the shank rod of the rock drill. In machine rod change devices, a piston that is movably fitted inside a cylinder allows
A first pressure oil chamber and a second pressure oil chamber formed inside the cylinder;
A piston rod that protrudes from the piston to the outside of the cylinder is connected to one of the grip pieces, a grip piece drive member that connects the cylinder body to the other grip piece, and a piston member that is movably fitted inside the casing. , a storage chamber formed in the casing and communicating with the first pressure oil chamber and capable of storing a certain amount of oil sent from the first pressure oil chamber; When the piston member is moved toward the storage chamber,
A metering valve having an oil supply chamber that sends oil in the storage chamber to the first pressure oil chamber, communicates the second pressure oil chamber with the oil pressure source, communicates the first pressure oil chamber with the oil tank, and connects the oil pressure source with the oil supply chamber. By moving the piston toward the first pressure oil chamber side with the pressure oil supplied to the second pressure oil chamber from a holding position in which the first pressure oil chamber is isolated from the oil tank, the second pressure oil chamber and the oil tank are communicated, and the oil supply chamber of the metering valve is communicated with the oil pressure source; the first pressure is returned to the holding position; The oil chamber and the hydraulic pressure source are communicated, the second pressure oil chamber and the oil tank are communicated, and the oil supply chamber of the metering valve is communicated with the oil tank, so that the oil is supplied from the hydraulic source to the first pressure oil chamber. A flow path switching valve having an open position in which the piston is moved toward the second pressure oil chamber by pressure oil, and the oil in the second pressure oil chamber is returned to the oil tank. Machine rod change device.