JPH061668Y2 - Mutual interference prevention device for charging cage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a mutual prevention device for charging cages in a drill jumbo equipped with two sliding storage type charging cages.

[Conventional technology]

The drill jumbo is equipped with a charging cage for use in operations such as loading explosives after making a hole in the face of the drill. When the excavated cross section is large, two drill cages are used to improve work efficiency. The charging cage will be installed. When moving the cage part of these charging cages to the working position, the manual lever provided on the cage part or the yoke part of the charging boom is operated to raise and rotate the charging boom.

[Problems to be Solved by the Invention] However, when the two charging cages are operated individually, they may interfere with each other, which may cause damage to the charging cages due to collisions or injury to the passengers on board. .

The present invention solves the above problems in a drill jumbo equipped with a charging cage, and provides a mutual prevention device for the charging cage, which prevents damage to the charging cage and improves work safety. With the goal.

[Means for solving problems]

In order to solve the above problems, the mutual interference preventing device of the charging cage of the present invention detects the operating position and the storing position of each charging cage in a drill jumbo equipped with two sliding retractable charging cages. Position detector, an angle detector that detects the swing limit angle of the charging boom, and two charging cages are in the operating position or stored based on the detection signals of the position detector and the angle detector. Limit the swivel angle range to the inside of each charging boom when in the position, remove the swing angle range restriction of the two charging booms, and limit only the swing angle range of the charging booms in the retracted position. An electromagnetic switching valve for switching the hydraulic operating circuit of the swing cylinder is provided.

[Action]

During the excavation work, the drill jumbo is installed near the face,
Drilling is performed by a drifter mounted on a guide shell supported by a drill boom. At this time, both charging cages are retracted to the storage position. When the drilling is complete, the charging cage is advanced to the operating position to load explosives. When both charging cages are in the operating position or both are in the storage position, the position is detected by the position detector. At this position, when the charging booms are swung inward (directions close to each other) to a predetermined swivel limit angle, they are detected by the angle detector, and the detection signal of the position detector and the detection signal of this angle detector are detected. On the basis of the above, the electromagnetic switching valve provided in the hydraulic operating circuit of the swing cylinder is switched, and the swing of the charging boom is stopped. Therefore, the swing angle range of the charging cage is limited and mutual interference is prevented.

When working with only one of the two charging cages, one is in the working position and the other is retracted to the stowed position. In this case, one is the working position,
The position detector detects that the other is in the retracted position, the charging boom on the operating side is swung inward, and the electromagnetic switching valve is switched even if it is detected by the angle detector exceeding the predetermined swing limit angle. Is not performed, and it is possible to turn for the entire stroke of the turning cylinder. At this time,
The other charging cage is retracted to the stowed position so that no mutual interference occurs.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a drill jumbo having a charging cage mutual interference prevention device according to an embodiment of the present invention,
FIG. 2 is a plan view showing an arrangement state of the charging cage.

Here, the drill jumbo is equipped with a drill boom 3 supporting a guide shell 2 carrying a drifter 1 in the front part of the trolley 4, and on the upper part of the trolley 4 there are left and right slide rails 5.
L and 5R are laid, and two charging cages 6L and 6R are mounted on the slide rails 5L and 5R so as to be slidable back and forth. This charging cage 6L, 6R
Is a slide yoke 7L, 7R that slides on the slide rails 5L, 5R, and a lower end of the charging boom 8L pivotally supported so that the lower end of the slide yoke 7L, 7R can be raised and lowered.
8R and cage parts 9L, 9R pivotally supported at the other ends of the charging booms 8L, 8R. 10
L and 10R are cylinders for turning the charging booms 8L and 8R, and 11L and 11R are charging booms 8L and 8R.
This is an R elevation cylinder.

The trolley 4 is provided with limit switches LSFL, LSFR, LSRL, SLRR as position detectors for detecting the positions when the charging cages 6L, 6R are in the forward operating position and the retracted storage position. In addition, the slide yokes 7L and 7R are provided with limit switches LSSL and LS as angle detectors for detecting the turning limit angles of the charging booms 8L and 8R.
SR is provided.

Cylinder 10 for turning the charging boom 8L, 8R
As shown in FIG. 3, L and 10R are single-rod double-acting type cylinders, in which the head side and rod side oil chambers are connected to the manual control valve 14L from the discharge lines 13L and 13R of the hydraulic pumps 12L and 12R. , 14R via hydraulic actuation circuit 15L,
15R, 16L, 16R are connected. The manual control valves 14L and 14R are three-position switching valves, and at the I position, the discharge pipelines 13L and 13R are moved from the B port to the hydraulic operating circuit 1.
The cylinders 10L and 10L for turning are made to communicate with the head side oil chambers of the cylinders 10L and 10R for turning through 5L and 15R.
R is extended and the charging booms 8L and 8R are swung to the outside, and at the position II, the discharge pipe lines 13L and 13R are moved from the A port to the rod side oil chambers of the swiveling cylinders 10L and 10R through the hydraulic operation circuits 16L and 16R. The charging booms 8L and 8R are swung inward by shortening the swiveling cylinders 10L and 10R. In the neutral position, the pressure oil returns from the N port to the tank 20.

In the middle of the hydraulic operating circuits 16L and 16R for turning the charging booms 8L and 8R inward, the electromagnetic switching valve 17 is provided.
L and 17R are provided. This solenoid switching valve 17L,
Reference numeral 17R is a cylinder for swivel that normally connects hydraulic actuation circuits 16L, 16R to the rod-side oil chamber of the cylinders 10L, 10R for swivel, and shuts off hydraulic circuits 16L, 16R when solenoids SOLL, SOLR are activated and switched. 1
0L, 10R rod side oil chamber from T port to tank 20
Charging booms 8L, 8
Stop turning inward of R.

The electric circuit for controlling the electromagnetic switching valves 17L and 17R has a fourth
As shown in the figure, between the power supply lines P ₁ and P ₂ , an a contact of a limit switch LSFL for detecting the operating position of the charging cage 6L, an a contact of a limit switch LSRR for detecting the storing position of the charging cage 6R, Left boom turning limit release circuit 1 that connects the relay and the relay XL in series
Limit switch LSFR for detecting the operating position of the charging cage 6R between 8L and the power supply lines P ₁ and P _2.
A contact, a limit switch LSRL a contact that detects the storage position of the charging cage 6L, and a relay XR
A right boom turning restriction release circuit 18R for connecting in series with
Inside the left boom, the b contact of the relay XL, the a contact of the limit switch LSSL for detecting the swing limiting angle of the charging boom 8L, and the solenoid SOLL of the solenoid operated directional control valve 17L are connected in series between the power supply lines P ₁ and P _2. The relay X is provided between the turning restriction circuit 19L and the power supply lines P ₁ and P _2.
The right boom inside turning limiting circuit 19R connects in series the R contact b, the limit switch LSSR a contact for detecting the turning limit angle of the charging boom 8R, and the solenoid SOLR of the electromagnetic switching valve 17R in series.

In this circuit, two charging cages 6L, 6
When both R are in the operating position or both are in the retracted position, the left boom turning restriction releasing circuit 18L and the right boom turning restriction releasing circuit 18R are always open, and the relay X
L and XR do not work. When the charging booms 8L, 8R are swung inward at this position up to a predetermined turning limit angle, the limit switch L for detecting the turning limit angle.
A contact of SSL, LSSR is closed, solenoid SOL
Since the L and SOLR are excited, the electromagnetic switching valves 17L and 1
7R is switched and the inward turning of the charging booms 8L and 8R is stopped.

When one of the two charging cages 6L and 6R is in the operating position and the other is in the storage position, for example, the charging cage 6L is in the operating position and the charging cage 6R.
Is in the storage position, the limit switches LSFL, LS
The a contact of RR is closed and the relay XL is activated to open the b contact of the relay XL of the left boom inside turning restriction circuit 19L. At this position, the charging boom 8L is swung inward to a predetermined swing limit angle, and the solenoid S is closed even if the a contact of the limit switch LSSL for detecting the swing limit angle is closed.
Since the OLL does not operate, the electromagnetic switching valve 17L is not switched, and the charging boom 8L can turn for the entire stroke of the turning cylinder 10L.

[Effect of device]

Since the device of the present invention is configured as described above and does not cause mutual interference of the charging cages, the charging cages can be prevented from being damaged and the safety of the operator can be ensured.

[Brief description of drawings]

FIG. 1 is a side view of a drill jumbo having a charging cage mutual interference prevention device according to an embodiment of the present invention,
FIG. 2 is a plan view showing an arrangement state of two charging cages, FIG. 3 is a hydraulic circuit diagram of a swing cylinder of a charging boom, and FIG. 4 is an electric circuit diagram for controlling an electromagnetic switching valve. Is. In the figure, 6L and 6R are charging cages, 8L and 8R are charging booms, 9L and 9R are cage portions, 10L,
10R is a turning cylinder, 12L and 12R are hydraulic pumps, 14L and 14R are manual control valves, and 15L, 15R and 1
6L and 16R are hydraulic actuation circuits, 17L and 17R are electromagnetic switching valves, LSFL, LSFR, LSRL and SLRR are limit switches for detecting the position of the charging cage, and LSSL and LSSR are the swing limit angles of the charging boom. This is a limit switch for

Claims (1)

[Scope of utility model registration request] 1. A drill jumbo equipped with two sliding storage type charging cages, and a position detector for detecting an operating position and a storage position of each charging cage,
Based on the angle detector that detects the swing limit angle of the charging boom and the detection signals of the position detector and the angle detector, when the two charging cages are both in the operating position or both are in the retracted position. Limit the swing angle range to the inside of the charging boom, and limit the swing angle range of the charging boom in the operating position when one of the two charging cages is in the operating position and the other is in the retracted position. A mutual interference preventing device for a charging cage, which is provided with an electromagnetic switching valve that switches a hydraulic operation circuit of a swing cylinder so as to limit only a swing angle range of the charging boom in the retracted position.