JPH01142138A - Safety device for slewing of construction machine - Google Patents

Abstract

PURPOSE:To raise the operability and safety of slewing of construction machine by a method in which two obstacle sensors are provided on the right and left sides of the upper slewing body, and solenoid switch valves are set in pilot oil paths for remote control. CONSTITUTION:Obstacle sensors 5-8 are provided on left and right sides of an upper slewing body 2', and solenoid switch valves 20 and 21 are provided to pilot oil paths 27 and 28 to connect pilot valves 15 and 16 for remote control with the left and right-handed pilot pressure receivers 12 and 13 of a slewing valve 11. Detection signal from any one of the sensors 6 and 8 having back-side signal ranges R and R' is input in a controller 24. Whereupon, the operation of the slewing body 2' is stopped through switch valves 20 and 21, and when an operating lever 17 is operated in the opposite direction, the body 2' is allowed to turn in that direction. Also, when an obstacle is detected during the stop period of the body 2', the body 2' is not allowed to turn.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a swing safety device for an upper swing type construction machine in which an upper swing structure is equipped with an obstacle sensor.

BACKGROUND OF THE INVENTION FIG. 3 is an overall side view of a hydraulic excavator among construction machines. In the figure, 1 is a lower traveling body and 2 is an upper revolving body. FIG. 4 is a plan view of a construction machine equipped with a conventional turning safety device.

3.4 is an obstacle sensor attached to the left and right sides of the upper revolving structure 2, and 0 is the center of rotation of the upper revolving structure 2.

Conventional technology swivel safety bag for construction machinery! ! (not shown), obstacle sensors are installed on the left and right sides of the upper revolving body, and the obstacle sensors are configured to be able to be linked with the turning operation, and a detection signal from the obstacle sensor is output to the control device during the turning operation. In the conventional swing safety device, when an obstacle is detected by the obstacle sensor during the rotation operation of the upper revolving body, For this purpose, when the driver brings the upper revolving structure close to an obstacle, confirms the obstacle, and immediately performs a reverse turning operation, However, the upper revolving structure did not rotate even after the rotation operation was performed.Therefore, this was a problem in cases where personnel were involved.Furthermore, with the conventional rotation safety device, if there was an obstacle before starting the rotation operation, the upper rotating structure would not rotate. However, since the obstacle sensor does not work unless a turning operation is performed, the upper rotating body starts turning when the turning operation lever is started, which is dangerous.

This invention solves the above-mentioned problems, and allows the obstacle sensor to always function not only during the turning operation of the upper revolving structure but also when the upper revolving structure is stopped, and if an obstacle is detected at the start of turning. A swing safety device is provided that disables the swing operation and stops the swing operation of the upper revolving structure when an obstacle is detected during the swing operation, but enables the swing operation in the opposite direction. purpose.

Means for Solving the Problems The means of the present invention taken to solve the above-mentioned problems are as follows: (a) a plurality of obstacle sensors are arranged on the left and right sides of the upper revolving body, and (b) a remote control is provided. An electromagnetic switching valve is provided in each of the pilot oil passages that communicate the pilot valve for use with the left and right pilot pressure receiving parts of the swivel valve, and (c) each solenoid of the electromagnetic switching valve is linked with the obstacle sensor via the controller part. Furthermore, an operation changeover switch is connected to the controller section so that the above-mentioned solenoid can be turned off separately, and a detection signal from either one of the obstacle sensors having rear side signal ranges on the left and right sides of the upper revolving body is connected. When the detection signal is output to the controller section, the electromagnetic switching valve on the side that outputs the detection signal is switched to the pilot oil passage cutoff position, and the electromagnetic switching valve on the other side is set so that it can be held in the pilot oil passage open position. did.

Operation A: When a detection signal from one of the obstacle sensors having a rear side signal range on the left and right sides of the upper rotating body is output to the controller unit, the controller unit switches the electromagnetic switching valve on the side that outputs the detection signal. energize the solenoid.

Since the electromagnetic switching valve switches from the oil passage opening position to the oil passage blocking position, the swivel valve returns to the neutral position. Then, the rotational operation of the swing motor is stopped. At this time, even if the lever is operated again in the direction of rotation before the swing motor is stopped, the rotation cannot be started in that direction.

However, in the above case, the controller section maintains the solenoid for the electromagnetic switching valve on the other side that did not output the detection signal in a de-energized state.

Therefore, if the operating lever is immediately operated in the opposite direction to the above-mentioned direction in the upper revolving structure which has stopped in the state described in the above item A, the upper revolving structure will be able to perform a swing operation in accordance with that direction.

C. As mentioned in item A above, if you turn off the operation selector switch on the energized solenoid valve side, the solenoid for that solenoid valve will be de-energized, and the solenoid valve will move from the oil path cutoff position to the oil path cutoff position. Return to road opening position. Thereby, the remote control operating lever can be operated in any direction.

Embodiments Hereinafter, a turning safety device according to the present invention will be explained in detail with reference to the drawings. FIG. 1 is a plan view of a construction machine equipped with a turning safety device according to the present invention.
2' is an upper rotating body, 5 and 6 are obstacle sensors attached to the left side of the upper rotating body 2', 7.8 are obstacle sensors attached to the right side, and F and F' are obstacle sensors 5. , 6, respectively, and R and R' are the respective signal ranges of the obstacle sensor 7.8. FIG. 2 is a hydraulic circuit diagram of the swing safety device according to the present invention. In FIG. The control swivel valve, 12.13 are the left and right pilot pressure receivers of the swivel valve 11, 14 is the main pump, 15.16 is the remote control pilot valve, 17 is the operating lever, 18 is the pilot pump, and 19 is the operating tank. , 20.21 are electromagnetic switching valves, 22.23 are solenoids of the electromagnetic switching valves 20.21, and 24 are controller units 25.26.
are operation changeover switches.

Next, the configuration of the turning safety device according to the present invention will be described with reference to FIGS. 1 and 2. A plurality of obstacle sensors 56 and 7, 8 are arranged on the left and right sides of the upper revolving body 2', respectively. On the other hand, electromagnetic switching valves 20.21 are provided in the pilot oil passages communicating the remote control pilot valve 15.16 and the left and right pilot pressure receiving parts 12.13 of the swivel valve 11, respectively. The respective solenoids 22 and 23 and obstacle sensors 5, 6, and 7° 8 were linked via the controller section 24. Furthermore, operation changeover switches 25 and 26 are connected to the controller section 24 so that the solenoids 22 and 23 can be turned off separately.

Then, the rear side signal ranges R, R of the left and right sides of the upper revolving body 2
When a detection signal from one of the obstacle sensors 6.8 having a sensor 6.8 is output to the controller section 22, the electromagnetic switching valve on the side that outputs the detection signal is switched to the pilot oil passage blocking position, and the other The electromagnetic switching valve on the side is set so that it can be held in the pilot oil passage open position. Note that the obstacle sensor 5 has a front side signal range F, F".
, 7 are installed for use in other functions such as alarm generation.

Next, the operational functions of the turning safety device according to the present invention will be described. Move the remote control lever 17 to left/right position 4.
For example, the user operates one mouth in the direction of the mouth position. The pressure oil discharged from the pilot pump 18 passes through the pilot valve 16, the pilot oil passage 27, the oil passage open position of the electromagnetic switching valve 21 (at this time, the solenoid 23 is de-energized), and the pilot oil passage 28. It acts on the pilot pressure receiving part 13 of the swivel valve 11 and switches the swivel valve 11 to two positions.

Then, the swing motor 9 rotates clockwise, causing the upper swing structure 2° to swing. If the obstacle sensor 8 having the rear side signal range R' detects an obstacle while the upper revolving body 2' is being operated to swing in this manner, a detection signal from the obstacle sensor 8 is output to the controller section 24. As a result, the controller unit 24 energizes the solenoid 23 of the electromagnetic switching valve 21 so that the electromagnetic switching valve 21 is switched from the oil passage opening position to the oil passage blocking position E, so that the swivel valve 11 returns from the second position to the neutral position. Then, the rotational operation of the swing motor 9 is stopped. At that time, even if the operating lever 17 is operated again toward the opening position, the swing motor 9 will not start because the electromagnetic switching valve 21 is in the oil passage blocking position 2. However, in the above case,
The controller unit 24 maintains the solenoid 22 for the electromagnetic switching valve 20 on the side of the obstacle sensor 6 that did not output a detection signal in a non-energized state. Therefore, if the operating lever 17 is immediately operated in the opposite direction to the A position when the upper rotating body 2' is in a stopped state as described above, the swing motor 9 will rotate to the left and the upper rotating body 2' will be rotated. Can be done. In the above explanation, the case where the obstacle sensor 8 having the rear side signal range R'' detects an obstacle has been described, but the same applies when the obstacle sensor 6 having the rear side signal range R detects an obstacle. Exercising the action function of

In addition, when the operation selector switch 26 on the electromagnetic switching valve 21 side that is in the energized state in the above example is turned off, the solenoid 23 becomes de-energized, and the electromagnetic switching valve 21 moves from the oil passage blocking position E to the oil passage opening position. Return to. Thereby, the remote control operation lever 17 can be operated in the direction of the mouth position. The other operation changeover switch 25 has the same function as the operation changeover switch 26 for the electromagnetic changeover valve 20.

Effects of the Invention In the conventional swing safety device, when an obstacle is detected by the obstacle sensor during the swing operation of the upper structure, the normal and reverse rotation operations of the upper structure are completely stopped. Therefore, when the driver brings the revolving upper structure close to an obstacle, confirms the obstacle, and immediately performs a reverse rotation operation, the upper revolving structure does not rotate even if the driver performs the reverse operation. Ta. Therefore, this was a problem when responding to situations involving personal injury.

In addition, in the conventional turning safety device, even if there is an obstacle before starting the turning operation, the obstacle sensor does not work unless the turning operation is performed. The revolving structure rotated, which was dangerous.

However, in the swing safety device according to the present invention, an electromagnetic switching valve is provided in each pilot oil passage for the remote control.
When a detection signal from one of the obstacle sensors having rear side signal ranges on the right and left sides of the upper revolving body is output to the controller section, the turning operation of the upper revolving body is stopped.

At that time, even if the operating lever is operated again in the turning direction before the upper revolving structure was stopped, the upper revolving structure will not start. However, in the above case, that is, if the operating lever is operated in the opposite direction immediately after the swinging operation of the upper revolving structure is stopped, the upper revolving structure becomes capable of swinging in that direction.

Therefore, the turning safety device according to the present invention is.

If an obstacle is detected while the upper revolving structure is not performing a turning operation, it will not be possible to perform a turning operation in that direction, and if an obstacle is detected while turning, the , the rotation operation of the upper revolving structure is stopped, but the rotation operation in the opposite direction is possible. This improves the turning operability and safety of the construction machine.

[Brief Description of the Drawings] Fig. 1 is a plan view of a construction machine equipped with a swing safety device according to the present invention, Fig. 2 is a hydraulic circuit diagram of the swing safety device according to the present invention, and Fig. 3 is a diagram of a hydraulic excavator. The overall side view, FIG. 4, is a plan view of a conventional construction machine. 2.2"--・------------------------- Upper revolving body 3.4.5-------------- Thin harmful object sensor 9-- −・−・・−・・−・・−・−・−・−・・
−・・−・−Single rotation motor 11 −・−・−・・−・−・
−−１・・・−・−・−・−・−・Swiveling valve 12.13
−−・・−・・−・−・・−・Pilot pressure receiving part 15.16 ・−・・−・−・・−・・・−
--Pilot valve 20, 21-=----1・----
---Solenoid switching valve 22.23----m-----
・・−・Solenoid 24 ・・−・−−−−1−−
−−−−・・−・・−・−・・−−−1・−・Controller section 25, 26−−−−・−・・−・−・−・−Operation selector switch and above

Claims (1)

[Claims] A construction machine consisting of a lower traveling body and an upper rotating body, equipped with a swing motor and a pilot-selected swing valve for rotating the upper rotating body, and equipped with obstacle sensors on the left and right sides of the upper rotating body, respectively, as described above. Multiple obstacle sensors are installed on the left and right sides of the upper revolving body, and
An electromagnetic switching valve is provided in each of the pilot oil passages communicating between the remote control pilot valve and the left and right pilot pressure receiving parts of the swivel valve, and the solenoids of the electromagnetic switching valve and the obstacle sensor are linked via the controller part. death,
Furthermore, an operation changeover switch is connected to the controller section, and when a detection signal from either one of the obstacle sensors having a rear side signal range on the left and right sides of the upper revolving body is output to the controller section, the detection signal is detected. Turning safety for construction machinery, characterized in that the electromagnetic switching valve on the side that outputs the signal is switched to the pilot oil passage blocking position, and the electromagnetic switching valve on the other side is set so as to be able to be held in the pilot oil passage open position. Device.