JPH03228929A - Interference avoidance device for working machine - Google Patents

Abstract

PURPOSE:To enhance the reliability of safety confirmation by providing a stopping means and a stopping release means for a working machine, and stopping the machine and actuating an alarm when the front end of the machine nears a position at the predetermined distance from the external surface of a driver's cabin. CONSTITUTION:When the front end 50 of a working machine 4 nears a position at the predetermined distance L from the external surface of a driver's cabin 21, a controller 45 outputs a control cutout instruction signal to the solenoid 44 of an electromagnetic selector valve 43. Then, the pilot pressure receiving sections (a), (b) and so forth of respective pilot selector valves 25, 24, 26 and 27 for each type of hydraulic cylinders 13, 11, 12 and 20 for the working machine 4, are made continuous to an oil tank 40 via check valves 51, 52 and so forth, and the tank continuity oil passage position P of the electromagnetic selector valve 43, thereby stopping the working machine 4. Furthermore, the controller 45 concurrently outputs an instruction signal to a buzzer 49.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates primarily to a work machine interference avoidance device for construction machines such as hydraulic excavators.

Conventional technology In a hydraulic excavator equipped with a gutter digging work machine, a gutter digging boom is attached to the front part of the upper rotating body, and an arm and a bucket I are sequentially connected to the tip of the gutter digging boom.
I try to do refraction work exercises. Therefore, when excavating and loading work is performed with the work implement offset in front of the operator's cab, there is an area within the movement range of the work implement that interferes with the operator's cab, which is extremely dangerous. To this end, a bending motion detection means for detecting the operation of the working machine has been provided, and various measures have been taken into consideration to prevent the interference of the working machine based on the signal from the bending motion detecting means.

Problems to be Solved by the Invention Since there is an area within the movement range of the working machine that interferes with the driver's cab, packets may interfere with and collide with the driver's cab during excavation and loading work. This accident damaged the driver's cab and at the same time caused disaster for the driver.

The present invention solves the above problems and provides a work machine interference avoidance device that performs stop processing and release processing to prevent work machine interference, and also effectively issues an alarm in response to the above processing state. The purpose is to

Means for Solving the Problems The means of the present invention taken to solve the above problems are as follows: (1) (1) A stop processing means for stopping the movement of the working machine;
A release processing means for canceling the stoppage and an alarm generation means for sounding a buzzer etc. are provided, and when the tip of the work equipment approaches a predetermined distance from the outer periphery of the operator's cab, the work equipment is stopped and a predetermined time is set. It was configured to issue an alarm such as a buzzer only during the specified time.

(2) B. In the work machine interference avoidance device according to claim 1, when the release processing means is selected for the work machine in the stop processing state, the stop processing of the work machine is canceled and the work machine is in that state. The system is configured to issue alarms such as a buzzer in response to the situation.

Function (1) A: When the tip of the work equipment approaches a predetermined distance from the outer periphery of the operator's cab during work, a command signal is output from the controller to the electromagnetic switching valve. The electromagnetic switching valve switches from the cut-off oil passage position to the tank communication oil passage position. The pilot pressure receiving portions of the pilot switching valves of the various hydraulic cylinders for working machines communicate with the oil tank via the tank communication oil passage position of the electromagnetic switching valve. As a result, the work machine is stopped and interference with the work machine is avoided.

B5 At the same time as the stop processing in item A above is performed, a command signal is output from the controller to the buzzer. Therefore, the buzzer sounds for a predetermined period of time to alert the driver.

The driver can confirm the stop processing of the work machine by listening to the sound of the buzzer, so that the sound of the buzzer is automatically stopped after a predetermined period of time has elapsed.

(2) A0 When the work machine is in the stop processing state, when the switch for canceling the stop processing is operated, the signal is input to the controller. Based on that signal, the controller
The control cut command signal to the relay contact leading to the solenoid for the electromagnetic switching valve is released.

B. At the same time as the cancellation process in item A above is performed, the driver attempts to start an operation, and the buzzer sounds in response to this state. The driver can listen to the buzzer and operate the work equipment with due care and caution.

Thereby, interference with the working machine after the release process is prevented.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 2 is a side view of the hydraulic excavator 1. In the figure, 2 is the lower traveling body of the hydraulic excavator 1, 3 is the upper rotating body, 4 is a working machine attached to the front part of the upper rotating body 3,
5 is the side ditch digging boom of the working machine 4, 6 is the side ditch digging boom 5
Rear boom 7 is the front boom, 8 is the upper boom,
9 is an arm, 10 is a packet, 11 is a boom cylinder,
12 is an arm cylinder, 13 is a packet cylinder 14, a pin joint at the base of the rear boom 6, 15 is a pin joint at the base end of the front boom 7, 16 is a pin joint at the base end of the arm 9, 21 is a driver's cab, Reference numeral 50 indicates a pin coupling portion connecting the tip of the arm 9 and the base end of the packet 10, 17 a boom potentiometer attached to the pin coupling portion 14, 18 an offset potentiometer attached to the pin coupling portion 15, and 19 a pin coupling. In the arm potentiometer attached to section 16, α is the boom inclination angle, β is the arm rotation angle, Ll is the rear boom length, L2 is the front boom length, L3 is the upper frame length, and L4 is the arm length. FIG. 3 is a plan view of the hydraulic excavator 1 in FIG. 2. In the figure, 20 is offset 1 to cylinder, γ is offset angle, and L5 is offset dimension.

FIG. 1 is a circuit diagram showing a working machine interference avoidance device 22 according to the present invention. In the figure, 23L.

23R is the left and right travel motor, 24 is the boom cylinder 11
Control pilot switching valve, 25 is packet cylinder 13
Control pilot 1 to switching valve, 26 is arm cylinder 12
Control pilot switching valve, 27 is offset cylinder 2
0 control pilot switching valve, 29.30 is a variable displacement hydraulic pump for each, 3 are pilot pumps, 40 is an oil tank, 41°42 is a pilot switching valve 24. ~, 27
43 is an electromagnetic switching valve, 44 is a solenoid for the electromagnetic switching valve 43, 45 is a controller, 46 is a memory, 47 is a stop processing release switch, 48 is a relay contact, 4 is a buzzer, 51, 52 The ゜ N is a pie 4 pie 1 to the pressure unit of piezu, one -11, one -11 -one -ichi, and a switching valve 25, 24, 26.27, respectively, respectively. Note that in the memory 46 of the controller 45,
The length of each part of the outer peripheral part of the operator's cab 21 and the machine 4 is Ll, ~, L4
and other data are stored.

Next, the configuration of the working machine interference avoidance device 22 according to the present invention will be described with reference to FIGS. 1 to 3. A stop processing means for stopping the movement of the working machine 4, a canceling means for canceling the stop, and an alarm generating means for sounding a buzzer or the like are provided. When the tip of the work implement 4 approaches a predetermined distance from the outer periphery of the operator's cab 21, the work implement 4 is stopped and an alarm such as a buzzer is sounded only within a predetermined time. Further, when the work machine interference avoidance device 22 selects a release processing means for the work machine 4 in the stop processing state, the stop processing of the work machine 4 is canceled, and in response to the state, an alarm such as a buzzer is generated. It was configured as follows.

Next, the functions of the working machine interference avoidance device 22 according to the present invention will be described. During work, when the tip of the work implement 4 (for example, the pin joint 50) approaches a predetermined distance from the outer periphery of the operator's cab 21 as shown in FIG. A control cut command signal is output to 44. The electromagnetic switching valve 43 is switched from the cut-off oil passage position to the tank communication oil passage position.

Therefore, various hydraulic cylinders 1B, 11° 12.
20 respective pilot switching valves 25, 24.26.2
7 pilot pressure receiving part 41 ports.

- check valves 51, 52 . n,
It communicates with the oil tank 40 through the tank communication oil path position nu of the electromagnetic switching valve 43. As a result, the work machine 4 is stopped, and interference with the work machine is avoided. At the same time as the above-described stop processing is performed, command signals are output from the controller 45 to the four buzzers. Therefore, the buzzer 49 uses a timer function (not shown) provided in the controller 45 to sound for a predetermined period of time, for example, 11 seconds, to issue a warning to the driver. Since the driver can confirm the stop processing of the working machine 4 by listening to the sound of the buzzer 49, the sound of the buzzer 49 is automatically stopped after a predetermined period of time, for example, t seconds has elapsed.

Further, when the work machine 4 is in the stop processing state, when the stop processing release switch 47 is operated, the signal is input to the controller 45. Based on that signal, controller 4
5, the control cut command signal to the relay contact 48 leading to the solenoid 44 for the electromagnetic switching valve 43 is released. At the same time as the above cancellation process is performed. The driver tries to start operating the work machine, but the buzzer 49 is sounded again only while the driver is operating the stop processing release switch 47 in response to that state. The driver can listen to the sound of the buzzer 49 and carefully operate the work machine 4 with sufficient caution. Thereby, interference with the working machine after the release process is prevented.

Effects of the Invention The work machine interference avoidance device according to the present invention includes a stop processing release means for stopping the movement of the work machine, a release processing means for releasing the stop, and an alarm generating means for sounding a buzzer, etc. When the tip of the machine approaches a predetermined distance from the outer periphery of the operator's cab, the work equipment is stopped and an alarm is issued, such as by sounding a buzzer within a predetermined time. Furthermore, when the release processing means is selected for a work machine in a stop processing state, the stop processing of the work machine is canceled, and an alarm such as a whooshing sound is generated in response to the state. Therefore, when the work equipment enters the stop processing state, the buzzer will sound or the predetermined t.
The buzzer is activated for only t seconds, and the buzzer automatically stops sounding after t seconds have elapsed. Therefore, there is no need for the buzzer to continue sounding after the driver confirms the stop processing status, which eliminates the driver's annoyance. Also, if you cancel the stop process using the stop process release switch, the next time you operate the work equipment, it will be a more dangerous operation.
Again, it is necessary to inform drivers of the danger. In that case, for example, while operating the stop processing release switch,
The buzzer sounding alarm is restored again. Therefore, the driver must be very careful and operate the work machine carefully, so that interference with the work machine after the release process is prevented.

In a hydraulic excavator equipped with the work machine interference avoidance device according to the present invention, work machine interference can be avoided by stopping and canceling the work machine, and safety can be confirmed in accordance with the stop process and canceling process by generating an alarm. Improve your sexuality.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a working machine interference avoidance device according to the present invention, FIG. 2 is a side view of a hydraulic excavator, and FIG. 3 is a plan view of the hydraulic excavator in FIG. 2. /l ---- ('I' work (measure 17, ], 8.19 ---- Potentiometer 2 ],
−−−−−−−−−−−−−−−−−−−]1−−−
--------Driver's cabin 22------------
-------------Work machine interference avoidance device 43
Solenoid switching valve 45 4 controllers Buzzer or more

Claims (2)

[Claims] (1) A working machine capable of bending movement toward the driver's cab by offset operation is attached to the front part of the upper revolving structure, and an operating position detection means for detecting the value of the tip of the working machine's operation is provided. In a work machine interference avoidance device that avoids a work machine from interfering with an operator's cab based on a signal from an operating position detection means, a stop processing means for stopping the movement of the work machine and a release process for canceling the stoppage. When the tip of the work equipment approaches a predetermined distance from the outer periphery of the operator's cab, the work equipment is stopped and an alarm such as a buzzer is issued for a predetermined period of time. A work machine interference avoidance device characterized in that the work machine interference avoidance device is configured to perform the following operations. (2) In the work machine interference avoidance device according to claim 1, when the release processing means is selected for the work machine in the stop processing state, the stop processing of the work machine is canceled, and the work machine corresponding to the state is A work equipment interference avoidance device characterized by being configured to issue an alarm such as a buzzer sound.