JPS6335110Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a control device for an independently rotating rock drill, and in particular, a lever that remotely controls the directional control valve of a fluid pressure motor for rod rotation, and a fluid supply valve for flushing. At the same time, the rock drill can be operated remotely, and a remote control valve that can control the rotational speed of the rotating mechanism and the flow rate of the flushing fluid in conjunction with each other during spot boring is provided to facilitate the operation of the rock drill.

Generally, a rock drill drills a hole in rock by striking and rotating a rod, but this involves striking the rod by the reciprocating motion of a piston, and also using a rifle bar and a rifle nut to control the reciprocating motion of the piston. There are two types: one is of the type that converts the rotation into rotation through the rod and gives rotation to the rod, and the other is of the independent rotation type that has a rotation mechanism for the rod separate from the striking mechanism. Therefore, large pneumatic rock drilling machines with large drilling capacity,
Independently rotating type hydraulic rock drills are mainly used.

Furthermore, the rock drill must perform flushing by supplying fluid such as water or air to the rod and ejecting it from the tip to discharge the powder produced by the drilling.

Therefore, with conventional independent rotary rock drills, striking, rotating, and flushing operations must be performed using separate operating levers, which is cumbersome to operate, especially at the start and end of drilling. ,
It is very difficult to perform these three operations simultaneously. In addition, when spot boring at the beginning of a hole, if the rotation speed of the rod is high, the hole position often shifts. Therefore, it is necessary to appropriately control the rotation speed of the rod and the flow rate of the flushing fluid, but this control requires skill, and improper operation may result in a decrease in work efficiency. It was a lot.

This invention solves such problems in independently rotating rock drills.

Therefore, the purpose of this invention is to provide a control device for a rock drill that can simultaneously operate the rotation of the rod and the supply of flushing fluid with a single operating lever. The purpose is to adjust the rotational speed of the rod and the flow rate of the crushing fluid to 1.
It is an object of the present invention to provide a control device for a rock drill that can be controlled in conjunction with a control lever, and a further object of this invention is to provide a rock drill that is easy to operate and has good work efficiency.

That is, this invention, in an independently rotary type rock drill as shown in the embodiment shown in FIG. The shuttle valve 3 is connected to a remote control valve 16 for remotely controlling the shuttle valve 13 and
9, a fluid supply circuit 10 for flushing
Pilot port 3 of fluid supply valve 28 interposed in
A control circuit 8 is connected to a pilot pipe line 40 for flushing operation, and is connected to a control circuit 22 which is branched from the drive circuit 14 on the normal rotation side of the hydraulic motor 6 and connected to the tank circuit 19 via the throttle 24. Fluid discharge provided in a flow rate control circuit 31 branched from the fluid supply circuit 10 from a rotation control pilot conduit 26 that connects the control switching valve 23 and the remote control valve 25 that remotely controls the control switching valve 23. valve 30
The present invention relates to a control device for a rock drilling machine characterized in that a pilot pipe line 50 for flow rate control is connected to a pilot port 48 of the rock drilling machine.

This invention will be explained below based on examples shown in the drawings.

FIG. 1 is an explanatory diagram showing the structure of an embodiment of this invention, in which a rock drill main body 1 is connected to a rod 2, a piston 3 that impacts the rod 2, a gear 4, and a chuck driver 5. and a hydraulic motor 6 that rotates the rod 2. In Rod 2,
A fluid passage 7 for flushing is bored, and a spout 8 is opened at the tip. The rear end of the flow path 7 is connected via a pipe 9 to a fluid supply circuit 10 for flushing. The piston 3 is given reciprocating motion by a striking control mechanism (not shown) and strikes the rod 2. Drive circuits 14 and 15 are connected to the hydraulic motor 6 from a discharge circuit 12 of a drive hydraulic pump 11 via a directional switching valve 13 . This directional switching valve 13 is a three-position hydraulically operated switching valve, and pilot pipes 17 and 18 for rotational operation are connected from a remote control valve 16, and the valve is switched by the hydraulic pressure. In the illustrated neutral position, the directional switching valve 13 connects the discharge circuit 12 of the drive hydraulic pump 11 to the tank circuit 19, and in the B position, connects the discharge line 12 of the drive hydraulic pump 11 to the normal drive circuit 14. At position A, the driving hydraulic pump 11
The discharge pipe line 12 is communicated with the drive circuit 15 on the reverse rotation side. In this embodiment, the remote control valve 16 is configured to switch between two two-position switching valves 16a and 16b with one control lever 16c, and is connected to the discharge circuit 21 of the control hydraulic pump 20. When the operating lever 16c is tilted in the direction of arrow b, the switching valve 16b is switched to the position to communicate the discharge circuit 21 of the control hydraulic pump 20 to the pilot conduit 17 for normal rotation side rotation operation, and the operating lever 16
When c is tilted in the direction of arrow a, the switching valve 16a is switched to the position to communicate the discharge circuit 21 of the control hydraulic pump 20 with the pilot conduit 18 for rotation operation on the reverse side. Note that the remote control valve 16 may be any valve that can be operated in the same manner with a single control lever, and may be, for example, a single three-position manual switching valve.

In addition, a control switching valve 23 and an aperture 24 are branched from the middle of the drive circuit 14 on the normal rotation side of the hydraulic motor 6.
A control circuit 22 in which the tank circuit 1 and
9 is connected. The control switching valve 23 is a two-position hydraulically operated switching valve, and a rotation control pilot conduit 26 is connected from the remote control valve 25, and is switched by the hydraulic pressure. Control switching valve 23
is normally closed, and when switched to the position, the normal rotation side drive circuit 14 of the hydraulic motor 6 is connected to the tank circuit 19.
communicate with. The remote control valve 25 is connected to the control lever 2
It is a two-position switching valve that can be switched at 7, to which the discharge pipe 21 of the control hydraulic pump 20 is connected, and by switching to the position, the control circuit 21 of the control hydraulic pump 20 is switched to the control pilot pipe 26. can be communicated with.

The fluid supply circuit 10 for flushing is connected to a fluid source 29 via a fluid supply valve 28,
Further, the fluid discharge valve 3 is connected from the downstream side of the fluid supply valve 28.
The flow rate control circuit 31 connected to 0 is branched. The fluid supply valve 28 has a spool 33 attached to the valve body 32.
A spring 34 is attached to one end of the spool 33 to bias and hold the spool 33 in a position where communication between the inflow port 35 and the outflow port 36 is cut off. , a pilot oil chamber 37 is provided and a pilot port 38 is opened. A flushing operation pilot line 40 is connected to the pilot port 38 from the rotation operation pilot lines 17 and 18 via a shuttle valve 39. Similar to the fluid supply valve 28, the fluid discharge valve 30 has a spool 43 fitted into a valve body 42, and a spring 44 attached to one end of the spool 43 to connect the spool 43 to the inflow port 45 and the outflow port 46. A pilot oil chamber 47 is provided at the other end of the spool 43 and a pilot port 48 is opened. 49 has been added. A flow rate control pilot line 50 is connected to the pilot port 48 from the rotation control pilot line 26 . 51 is a tank, and 52 and 53 are relief valves for the discharge pipes 12 and 21 of the drive hydraulic pump 11 and the control hydraulic pump 20.

During drilling work, the piston is driven by operating a blow control mechanism (not shown), and the switching valve 16b is switched to the position by tilting the operating lever 16c of the remote control valve 16 for rotation in the direction of arrow b. The discharge circuit 21 of the control pump 20 is connected to the rotational operation pilot pipe 17, and the directional control valve 1
3 to position B side, drive hydraulic pump 11
The discharge circuit 12 is communicated with the drive circuit 14 on the normal rotation side, and the hydraulic motor 6 is driven to give the rod 2 normal rotation. At the same time, the pilot conduit 17 for rotational operation
Pressure oil is sent to the pilot port 38 of the fluid supply valve 28 via the shuttle valve 39 and the flushing operation pilot line 40.
7, the spool 33 is moved against the spring 34, and the inflow port 35 and the outflow port 36 are communicated.
0. Flushing fluid is supplied to the flow path 7 of the rod 2 via the pipe 9 and is ejected from the ejection port 8. When reversing the rod 2, it is sufficient to tilt the operating lever 16c of the remote control valve 16 in the direction of arrow a. At this time, the flushing operation is also carried out from the pilot conduit 18 for rotational operation on the reversing side via the shuttle valve 39. Pressure oil is sent to the pilot pipe, so
Flushing fluid is supplied to the rod 2 in the same way as during normal rotation.

At the time of spot boring, if the remote control valve 25 is switched to the position using the control lever 27, the discharge circuit 21 of the control pump 20 is communicated with the rotation control pilot pipe line 26, and the control switching valve 23 is connected to the rotation control pilot line 26. In order to switch to the position side, the drive circuit 14 on the forward rotation side is connected to the aperture 2.
The hydraulic motor 6 is connected to the tank circuit 19 via the hydraulic motor 4, and a part of the hydraulic oil in the drive circuit is discharged to the tank 51, thereby making it possible to reduce the number of revolutions of the hydraulic motor 6. At this time, the pressure oil sent from the rotation control pilot line 26 to the pilot port 48 of the fluid discharge valve 30 via the flow rate control pilot line 50 flows into the pilot oil chamber 47 and resists the spring 44. Move the spool 43 to open the inlet port 45 and outlet port 4.
6, a part of the flushing fluid in the fluid supply circuit 10 is discharged to the outside of the system from the outflow port 46 of the fluid discharge valve 30 via the flow rate control circuit 31, reducing the flushing flow rate supplied to the rod 2. let The amount of fluid discharged from the fluid discharge valve 30 can be changed by adjusting the stroke of the spool 43 with a stroke adjustment screw 49.

As mentioned above, according to this invention, the rotation of the rod and the supply of flushing fluid can be controlled simultaneously with one operating lever, and the rotational speed of the rod and the flow rate of flushing fluid can be controlled with one operating lever. Since the rock drill can be controlled in conjunction with the control lever, it is easier to operate the rock drill, improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of this invention. In the figure, 1 is the rock drill body, 2 is the rod, 3 is the piston, 6 is the hydraulic motor, 10 is the fluid supply circuit, 11 is the drive hydraulic pump, 13 is the directional control valve, 14 and 15 are the drive circuits, 16 is a remote control valve,
19 and 18 are pilot pipes for rotational operation, 19 is a tank circuit, 22 is a control circuit, 23 is a control switching valve, 24 is a throttle, 25 is a remote control valve, 26 is a pilot pipe for rotational control, and 28 is a fluid Supply valve, 30
31 is a fluid discharge valve, 31 is a flow rate control valve, 39 is a shuttle valve, and 50 is a pilot pipe line for flow rate control.

Claims (1)

[Scope of utility model registration request] In an independently rotating type rock drill, from a rotary operation pilot conduit that connects a directional control valve interposed in the drive circuit of a hydraulic motor for rod rotation and a remote control valve that remotely controls the directional control valve. A pilot pipe line for flushing operation is connected to a pilot port of a fluid supply valve installed in a fluid supply circuit for flushing via a shuttle valve, and a pilot line is branched from the drive circuit on the normal rotation side of the hydraulic motor to establish a throttle. A rotary control pilot pipe branched from the fluid supply circuit connects a control switching valve installed in a control circuit that is connected to the tank circuit through a rotary control pilot pipe that connects a remote control valve that remotely controls the control switching valve. 1. A control device for a rock drilling machine, characterized in that a pilot pipe line for flow control is connected to a pilot port of a fluid discharge valve provided in a flow control circuit.