JP3856163B2 - Guide dump fixing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a guide dump fixing device for fixing a guide dump mechanism that rotatably supports a guide shell at a tip end portion of a boom in a drilling device such as a jumbo used for tunnel excavation work.
[0002]
[Prior art]
Generally, in tunnel excavation work, a blasting hole is drilled in the face rock using a drilling device, and an explosive is loaded into the hole to blast, and the rock is crushed and advanced.
[0003]
The drilling device supports the guide shell on which the rock drill is mounted at the tip of the boom, and this boom is extended, swiveled and raised to position the guide shell to the target position of the face. It has a multi-joint structure so that it can move such as tilt, swing, and rotary.
[0004]
In recent years, in order to facilitate the operation, a control means such as a computer is mounted on the drilling device, a detector for detecting the operation amount is provided at each joint portion of the boom, and the guide is based on the detection data. The calculation and display of the drilling position of the shell and the drilled rock drill and the automatic drill positioning can be used.
[0005]
In tunnel excavation work, rock bolt holes are drilled on the peripheral wall of the tunnel as necessary, depending on the conditions of the rocks of the natural ground, and the tunnel is reinforced by placing rock bolts in these holes.
[0006]
In a drilling device used in a tunnel excavation work site that needs to be drilled in a peripheral wall of a tunnel, a guide dump mechanism that allows a guide shell to be rotated by expansion and contraction of a guide dump cylinder is provided at the tip of the boom.
[0007]
When drilling through the face, the guide dump mechanism extends the guide dump cylinder and fixes the guide shell in a state parallel to the guide rotary at the tip of the boom. Also, when drilling holes in the face, when drilling holes with a cut angle, reduce the guide dump cylinder, rotate the guide shell several degrees (about 3-5 °), and fix it. Make a hole. In order to fix the guide dump mechanism in this way, a check valve for preventing the hydraulic oil from flowing out is provided in the dump side circuit and the return side circuit of the guide dump cylinder.
[0008]
When drilling in the peripheral wall of the tunnel, the guide dump cylinder of the guide dump mechanism is reduced and the guide shell is rotated 90 ° so that the guide shell is perpendicular to the guide rotary. In this state, if the guide rotary is held horizontally toward the tunnel excavation direction, a hole can be drilled in a direction perpendicular to the peripheral wall of the tunnel.
[0009]
[Problems to be solved by the invention]
However, if an excessive external force is applied to the guide shell while drilling the face with the drilling device, the hydraulic oil leaks from the check valve and the extended guide dump cylinder shrinks in parallel with the guide rotary. In some cases, the guide shell fixed so as to be inclined with respect to the guide rotary.
[0010]
A control means such as a computer is installed, and a detector that detects the amount of operation is provided at each joint part of the boom, and calculation and display of the drilling position of the guide shell and the drilled rock drill, and automatic drilling Even in a drilling device that enables hole positioning, the guide dump mechanism is not provided with an operation amount detector because the structure is usually complicated and expensive. The calculation for obtaining the position when tilting with respect to the rotary is not performed. That is, the guide dump mechanism in such a drilling device can only be used in the two states of the guide dump cylinder maximum extension (horizontal with respect to the guide rotary) or the guide dump cylinder minimum contraction (perpendicular to the guide rotary). The angle is set by boom tilt or boom swing.
[0011]
Therefore, if the guide dump cylinder is reduced during the drilling operation, an error occurs in the calculation display of the drilling position and automatic drilling positioning, resulting in poor drilling accuracy. Therefore, it is necessary for the operator to frequently operate the control valve to supply pressure oil to the guide dump cylinder and return the guide shell to the normal position, which increases the burden on the operator.
[0012]
If the guide dump mechanism is to be completely fixed, a special fixing means such as a clamp device is required, which increases the cost.
The present invention solves the above-described problem in fixing the guide dump mechanism of the drilling device, and has a simple and inexpensive structure that can surely fix the guide dump mechanism and reduce the burden on the operator. An object is to provide a fixing device.
[0013]
[Means for Solving the Problems]
In the present invention, in the drilling device that rotatably supports the guide shell on which the rock drill is mounted by the guide dump mechanism provided at the tip of the boom, the dump side circuit of the guide dump cylinder that rotates the guide shell, on the back side circuit, provided with a pilot check valve to prevent the flow of hydraulic fluid from the guide dump cylinder with guide dump fixed state, an accumulator provided in the hydraulic pressure source side of the pilot check valve of the return-side circuit, further, back a hydraulic pressure source side of the accumulator side circuit, constitute a guide dump fixing device provided with a check valves for preventing the outflow of hydraulic oil to the low-voltage circuit side from the accumulator side guide dump fixed state.
[0014]
When drilling through the face, the guide dump mechanism extends the guide dump cylinder and fixes the guide shell in a state parallel to the guide rotary at the tip of the boom. Then, the boom is moved to position the guide shell, and the drilling machine is driven to start drilling.
[0015]
If an excessive external force is applied to the guide shell during drilling, the guide dump cylinder or hydraulic fluid will leak, but at this time, the hydraulic oil is maintained so that the pressurized accumulator maintains the extended state of the guide dump cylinder. Replenish. The accumulator also prevents other hydraulic equipment from being damaged due to excessive surge pressure caused by external force.
[0016]
Therefore, the guide dump cylinder is not reduced and the guide shell is not inclined with respect to the guide rotary, and the operation of returning the guide shell to the normal position is unnecessary, so that the operator is not burdened. Moreover, since no hole error occurs, it can be constructed with high accuracy.
[0017]
In addition, if a pressure detector that detects the abnormal pressure of the accumulator is provided, an alarm is issued to pressurize the operator when the pressure of the accumulator drops in the drill hole and hydraulic oil cannot be replenished. As a result, the guide dump mechanism can be secured.
[0018]
When drilling in the peripheral wall of the tunnel, the guide dump cylinder of the guide dump mechanism is reduced and the guide shell is rotated 90 ° so that the guide shell is perpendicular to the guide rotary. In this state, if the guide rotary is held horizontally toward the tunnel excavation direction, a hole can be drilled in a direction perpendicular to the peripheral wall of the tunnel.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a configuration diagram of a drilling jumbo provided with a guide dump fixing device of the present invention, FIG. 2 is a hydraulic circuit diagram of the guide dump mechanism, and FIGS. 3 and 4 are explanatory views of the operation of the guide dump mechanism.
[0020]
Here, the jumbo 1 is provided with a boom 12 that can move on a carriage 11 such as expansion, contraction, turning, elevation, tilt, and swing. A guide rotary 13 is provided at the tip of the boom 12, and a guide dump shaft 14 is fixed to the guide rotary 13 in a direction perpendicular to the rotation axis X.
[0021]
A guide mounting 15 is rotatably supported on the guide dump shaft 14, and a guide dump cylinder 16 is attached between the guide dump shaft 14 and the guide mounting 15. A guide dump mechanism that rotates the guide mounting 15 about the guide dump shaft 14 is configured.
[0022]
A guide shell 6 is supported on the guide mounting 15 so as to be slidable back and forth, and a rock drill 9 is mounted on the guide shell 6. A rod 8 is inserted in the drilling machine 9, and feed in the front-rear direction is given to drill a hole in the face rock.
[0023]
The carriage 11 of the jumbo 1 is provided with a hydraulic unit 2 and a control valve 3 that is manually operated by an operator. Moreover, the control apparatus 4 provided with the computer is mounted, The detector (illustration omitted) which detects the operation amount is provided in each operation part of the boom 12, A guide shell or the like based on the detection data The drilling position of the drilled rock drill can be calculated and displayed automatically.
[0024]
The dump oil chamber 16D on the reduction side of the guide dump cylinder 16 and the return oil chamber 16R on the extension side are connected to the service port of the dump control valve 19 by the dump side circuit 17 and the return side circuit 18, The high pressure circuit P or the low pressure circuit T is communicated via the dump control valve 19.
[0025]
The dump control valve 19 is a three-position switching valve. When switched to the dump position, the dump side circuit 17 communicates with the high voltage circuit P and the return side circuit 18 communicates with the low voltage circuit T. When switched to the return position, the return side circuit 18 is switched to the high pressure circuit. The circuit P and the dump side circuit 17 are communicated with the low voltage circuit T. In the neutral position, the dump side circuit 17 and the return side circuit 18 are both communicated with the low voltage circuit T.
[0026]
The dump side circuit 17 and the return side circuit 18 include a pilot check valve 20 that prevents the hydraulic oil from flowing out of the dump oil chamber 16D and the return oil chamber 16R of the guide dump cylinder 16 when the dump control valve 19 is in the neutral position. Is provided.
[0027]
The above-described configuration is the same as that of the conventional one, but here, further from the accumulator 21 between the pilot check valve 20 and the dump control valve 19 of the return side circuit 18 and from the accumulator 21 when the dump control valve 19 is in the neutral position. A check valve 22 for preventing the hydraulic oil from flowing out to the low pressure circuit T side is provided. Further, a pressure detector 23 that detects an abnormal pressure of the accumulator 21 and sends a signal to the control device 4 is provided.
[0028]
When drilling through the face, the dump control valve 19 is switched to the return position so that the return side circuit 18 communicates with the high pressure circuit P and the dump side circuit 17 communicates with the low pressure circuit T. Then, the hydraulic oil is supplied to the return oil chamber 16R, and the hydraulic oil flows out from the dump oil chamber 16D. Therefore, the guide dump cylinder 16 is extended, and the guide shell 6 is rotated about the rotational axis X of the guide rotary 13 as shown in FIG. Becomes parallel.
[0029]
At the neutral position of the dump control valve 19, the pilot check valve 20 prevents the hydraulic oil from flowing out from the dump oil chamber 16D and the return oil chamber 16R of the guide dump cylinder 16, so that the guide dump mechanism is fixed in this state, and the guide The shell 6 is held in parallel with the rotation axis X of the guide rotary 13. Then, the boom 12 is moved to position the guide shell 6 and the drilling machine 9 is driven to start drilling.
[0030]
When an excessive external force F is applied to the guide shell 12 in the drill hole as shown in FIG. 3, in the conventional guide dump mechanism, the hydraulic oil flows from the return oil chamber 16R of the guide dump cylinder 16 through the pilot check valve 20 to a low pressure. There is a possibility that the guide dump cylinder 16 leaking into the circuit T is contracted and the guide shell 6 that is fixed so as to be parallel to the guide rotary 13 is inclined with respect to the guide rotary 13. At this time, hydraulic oil is supplied to the return oil chamber 16 </ b> R so that the accumulator 21 being pressurized maintains the extended state of the guide dump cylinder 16. The accumulator also prevents other hydraulic equipment from being damaged due to excessive surge pressure caused by external force.
[0031]
Therefore, the guide dump cylinder 16 is not reduced and the guide shell 6 is not inclined with respect to the guide rotary 13 as shown in FIG. 3, and the operation of returning the guide shell 6 to the normal position is unnecessary. Since the operator is not burdened and no hole error occurs, the work can be performed with high accuracy.
[0032]
If the pressure in the accumulator 21 drops into the hole and the hydraulic oil cannot be replenished, the pressure detector 23 detects an abnormal pressure in the accumulator 21 and sends a signal to the control device 4. Therefore, the control device 4 can ensure the fixation of the guide dump mechanism by issuing an alarm or stopping the automatic control of the boom 12 and causing the operator to supply hydraulic oil to the accumulator 21.
[0033]
When drilling in the peripheral wall of the tunnel, the dump control valve 19 is switched to the dump position so that the dump side circuit 17 communicates with the high voltage circuit P and the return side circuit 18 communicates with the low voltage circuit T. Then, the hydraulic oil is supplied to the dump oil chamber 16D, and the hydraulic oil flows out from the return oil chamber 16R. Therefore, the guide dump cylinder 16 is reduced and the guide shell is rotated by 90 °, and the guide shell is rotated as shown in FIG. The shell 6 is perpendicular to the rotation axis X of the guide rotary 13.
[0034]
In this state, if the guide rotary 13 is held horizontally toward the tunnel excavation direction, a hole can be drilled in a direction perpendicular to the peripheral wall of the tunnel.
[0035]
【The invention's effect】
As described above, the guide dump fixing device of the present invention can fix the guide dump mechanism reliably to reduce the burden on the operator, and can be constructed with high accuracy with no drilling error. In addition, the structure is simple and inexpensive.
[0036]
By providing a pressure detector that detects the abnormal pressure of the accumulator, when the pressure of the accumulator drops in the drill hole and hydraulic oil cannot be replenished, an alarm is issued to pressurize the operator. The guide dump mechanism can be secured.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a drill jumbo provided with a guide dump fixing device of the present invention.
FIG. 2 is a hydraulic circuit diagram of a guide dump mechanism.
FIG. 3 is an explanatory view of the operation of the guide dump mechanism.
FIG. 4 is an explanatory view of the operation of the guide dump mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Jumbo 2 Hydraulic unit 3 Control valve 4 Control apparatus 6 Guide shell 8 Rod 9 Rock drill 11 Bogie 12 Boom 13 Guide rotary 14 Guide dump shaft 15 Guide mounting 16 Guide dump cylinder 17 Dump side circuit 18 Return side circuit 19 Dump control Valve 20 Pilot check valve 21 Accumulator 22 Check valve 23 Pressure detector P High pressure circuit T Low pressure circuit X Rotating shaft

Claims (2)

The guide dump mechanism provided in the boom tip, the drilling device that pivotally supports the guide shells Noga the rock drill, and the return-side circuit and the dump circuit of the guide dump cylinders for rotating the guide shell In addition, a pilot check valve for preventing the hydraulic oil from flowing out from the guide dump cylinder when the guide dump is fixed is provided, an accumulator is provided on the hydraulic source side of the pilot check valve of the return side circuit, and an accumulator of the return side circuit is further provided. a hydraulic pressure source side of the guide dump fixing apparatus characterized in that a check valves for preventing the outflow of hydraulic oil to the low-voltage circuit side from the accumulator side guide dump fixed state. The guide dump fixing device according to claim 1, further comprising a pressure detector for detecting an abnormal pressure of the accumulator.

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