JPH0476184A - Dry stroke detecting method of rock surface - Google Patents

Abstract

PURPOSE:To improve the extent of operation efficiency by installing each dry stroke detector in both hydraulic circuits of a main drifter stroking the rear end of a swing plate and a side drifter stroking the rear end of a side drill respectively, detecting a dry stroke and making it so as to give a warning to an operator. CONSTITUTION:A field table 6 is installed, free of longitudinal motion, on a guide cell attached onto a rock surfacer via a mast free of vertical motion, and a main drifter 8 and two units of side drifters 9 are set up on the table 6. In addition, a line bit 14 is attached to the tip of a swing plate 10 and a drill bit 15 to the tip of a side drill 11, respectively, and a dry stroke detector 33 consisting of a hydraulic sensor is installed in each hydraulic circuit of these drifters 8, 9. With this detector, the occurrence of a dry stroke is caught as amplitude of working pressure, detected by the detector 33, lighting an indicator lamp 39, a warning is given to an operator. Consequently, the dry stroke is prevented from occurring, thus operation efficiency is improvable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for detecting blank strikes of a rock milling machine that splits a rock while forming slits in the rock.

(Prior Art) Conventionally, when excavating a tunnel or the like in rock, a rock grinder as shown in FIG. 9 is used.

The rock surface grinder is provided with a swing plate (b) which is swingable in the horizontal direction and has a line pick (a) attached to its tip, and which is rotatably provided on both sides of the swing plate (b).

and has a side drill d with a drill bit C attached to its tip, and these plate b and side drill d.
While applying an impact to the rear end by a main drifter f and a side drifter g installed on a feed table e, holes are drilled by a side drill d and slits are formed by a line bit a.

(Problem B to be Solved by the Invention) In the conventional rock grinding machine described above, rock is excavated by swinging the swing plate b in the horizontal direction and using the line bit a attached to the tip of the swing plate b. Since the side drill d drills a hole in the rock with the drill bit C by rotating it while applying an impact, the drilling mechanisms of the two are different from each other.

For this reason, it is necessary to select the striking conditions etc. for line bit a and drill bit C based on their respective excavation conditions, but in the past, the same conditions were used by main drifter f and side drifter g installed on the same feed table e. Since impact is applied to line bit a and drill bit C, there have been problems such as failure to make a cut at the start of rock drilling, occurrence of blank runs, and inability to perform efficient drilling.

This invention was made with the aim of improving the above-mentioned problems, and attempts to provide a method for detecting empty runs of a rock surface milling machine that enables drilling without empty runs by detecting empty runs that occur during drilling. It is something to do.

(Means and effects for solving the problem) In order to achieve the above object, the present invention has a swing plate provided at the tip of a swing plate that swings horizontally between holes drilled in rock by a side drill. In a rock surface milling machine that drills holes with a line bit, a protrusion detector is installed in the hydraulic circuit of the main drifter that hits the rear end of the swing plate and the main drifter that hits the rear end of the side drill. This system detects a blank line based on the amplitude, and if a blank line occurs, it warns the operator of the blank line or activates a blank drive prevention mechanism to automatically prevent the blank line.
As a result, even if hollow rods occur during drilling, the empty rows can be quickly resolved by changing the drilling conditions, thereby making it possible to prevent drilling defects due to empty rows.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 to 8.

Figure 1 shows the rock surface grinding machine 1.
An upper revolving body 4 is rotatably provided on a lower traveling body 3 that can freely run, and a mast 5a is attached to the front part of this upper revolving body 4.
A guide cell 5 is attached so as to be vertically movable.

A feed table 6 is provided on the guide cell 5 so as to be movable back and forth, and a main drifter 8 and two side drifters 9 are installed on both sides of the feed table 6. plate 1
The rear end of 0.

Then, the rear end of the side drill 11 is struck by the side drifter 9.

The swing plate 10 is provided on the guide cell 5 along the guide cell 5, and its tip side is swung in the left-right direction by a swing motor 13 about a support shaft 12. A line bit 14 is attached to the tip of the line bit 14, and the line bit 14 is used to form a slit in the rock.

Further, side drills 11 are provided on both sides of the swing plate 10 so as to be parallel thereto.

It is adapted to be rotated by a rotator 9a, and drill bits 15 are attached to the tip thereof, and these drill bits 15 are adapted to drill holes in rock.

Water supplied from the water supply pipe 16 is ejected from the line bit 14 to discharge the sludge generated during slit formation, and water from the drill bit 15 is ejected from the water supply pipe 17.
Water and air supplied from the air supply pipe 18 are ejected to discharge the sludge generated during drilling.

On the other hand, FIG. 5 shows a hydraulic circuit for driving the main drifter 8 and side drifter 9 installed on the feed table.
．． 22 is provided, and the hydraulic pressure discharged from each hydraulic pump 20 to 22 is controlled by an electromagnetic proportional flow control valve 23.24.2.
5 to each drifter 8.9.

The electromagnetic proportional flow control valves 23 to 25 are connected to a controller 26. The controller 26 has a drilling mode selection switch 27 as shown in FIG. 6, and a relay circuit 28 is connected to this drilling mode selection switch 27. The relay circuit 2 includes a setting volume group 29 for setting excavation conditions, a swing motor 13 and a side rotator 9.
Turn on a etc.

A solenoid valve group 30 for off-control is connected, and when a drilling mode is selected according to the drilling conditions using the drilling mode selection switch 27, the drilling conditions preset by the setting volume group 29 are set via the amplifier 31. The signal is output to the electromagnetic proportional control valves 23 to 25, and the swing motor 13 and the like are controlled on and off by the electromagnetic valve group 30.

Note that the switch position of the drilling mode selection switch 27, the electromagnetic proportional flow control valves 23 to 25 connected to the main drifter 8 and side drifter 9, and the swing motor 1
3 and the like are shown in Table 1 below.

In this Table-1, H4 and L of each drifter 8 and 9.

indicates the drilling level, and the drilling level is set in advance as shown in Table 2 below.

H4 indicates that the drilling level is set according to the rock to be drilled, and Lo indicates that the drilling level ■ is set.

Table-1 Table-2 On the other hand, the hydraulic circuits of the main drifter 8 and side drifter 9 are each provided with a dry stroke detector 33 consisting of a hydraulic pressure sensor, and the signals detected by these detectors 33 are provided to the controller 26. The signal is sent to the peak holder circuit 34 where the peak value is detected.

The peak value detected by the peak holder circuit 34 is A/
After A/D conversion by the D converter 35, the arithmetic processing unit 3
6 for data processing, and the results are sent to D/
After being D/A converted by the A converter 37, the signal is output to a display 38 and an indicator light 39, so that the peak value and blank firing are displayed respectively.

Note that FIG. 8 shows the operation panel.

Next, a method for detecting blank tapping of the rock surface grinding machine 1 configured as described above will be explained. When drilling rock, first select "Drill Cutting" with the rock drilling mode selection switch 27 to start rock drilling, the solenoid valve group 30 is operated according to the operations shown in Table 1-1, and the preset volume is The drilling conditions for the drill end cut set in the group 29 are outputted via the amplifier 31 to the electromagnetic proportional flow control valve 23.25 connected to the side drifter 9, and the drilling level is set to ■.

As a result, the side drifter 9 hits the side drill 11 at the drilling level (3) and starts drilling in the rock with the drill bit 15 attached to the tip, and at this time, the side rotator 9a rotates and the feed table 6 is fed. Speedy.

The drill bit 15 is set in a stable condition.
You will be able to perform a ``Kuchiri''.

When the opening is finished, next is the rock drilling mode selection switch 2.
When the machine 7 enters the drilling mode, the impact force of the side drifter 9, the rotational speed of the side rotator 9a, and the feed speed of the feed table 6 all become Hi, and drilling into the rock begins.

Further, during drilling, a blank stroke detector 33 provided on the line bit 14 and the drill focus 15 detects the operating pressure of the main drifter 8 and the side drifter 9.

Normally, when idle running occurs, the amplitude of the operating pressure of each drifter 8.9 becomes 30 kg/c11 or 40 kg/cj or more, so this amplitude is detected by the idle running detector 33 and sent to the peak hold circuit 34, and the peak hold circuit 34 detects this amplitude. The circuit 34 holds the peak value and sends it to the arithmetic processing unit fi36. Arithmetic processing unit?
&36 indicates that the peak value inputted from the peak hold circuit 34 is 30 kg/cd or 40 kg/cd, which is the value at the time of blank hitting.
Determine whether it exceeds aJ.

If it exceeds the value, the value is output to the display 38 and at the same time a lighting signal is sent to the 9 indicator light 39 to light the indicator light 39 to warn the operator that a blank shot has occurred.

This allows the operator to easily detect the occurrence of dry drilling, so that dry drilling can be prevented by changing the drilling conditions.

Further, by providing a blank hitting prevention mechanism and outputting a signal to this blank hitting prevention mechanism, blank hitting can be automatically prevented.

(Effects of the Invention) As described in detail above, this invention is designed to automatically prevent dry striking by warning the operator or activating a blank striking prevention mechanism when blank striking occurs during drilling. From what I did,
Since drilling defects due to dry drilling can be prevented, drilling work can be performed more efficiently.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall side view of a rock cutting machine, Fig. 2 is an enlarged plan view of a working machine part,
3 is a side view of the same, FIG. 4 is an enlarged plan view of the vicinity of the line bit, FIG. 5 is a circuit diagram of the drive system, and FIG. 6 is a block diagram of the control system. FIG. 7 is a circuit diagram of the dry striking prevention mechanism, FIG. 8 is a front view of the operation panel, and FIG. 9 is an explanatory diagram of a conventional rock splitting machine. 8...Main drifter 9...Side drifter l
O...Swing plate 11...Side drill 1
4...Line bit 15...Drill bit Patent applicant Komatsu Ltd. Representative (patent attorney) Osamu Matsuzawa (and 1 other person)

Claims (1)

[Claims] In a rock surface milling machine that drills holes between holes drilled in rock by a side drill 11 using a line bit 15 provided at the tip of a swing plate 10 that swings in the horizontal direction, the rear end of the swing plate 10 is A blank stroke detector 33 is provided in the hydraulic circuit of the main drifter 8 that strikes and the side drifter 9 that strikes the rear end of the side drill 11, and detects blank stroke from the amplitude of the operating pressure of each drifter 8, 9. A dry striking detection method for a rock surface grinding machine characterized by warning a worker of dry striking or preventing blank striking when striking occurs.