JPH0444652B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a locking device for a revolving body in a construction machine, and more specifically, to a locking device for a revolving body in a construction machine, and more specifically to a locking device for a locking device for a revolving body in a construction machine. The present invention relates to a device for locking the rotation of the revolving body when the maintenance panel is rotated downward for refueling, water supply, etc. in a construction machine equipped with a maintenance panel connected to the revolving body.

[Conventional technology]

In a large construction machine, for example, an ultra-large hydraulic excavator, the height H from the ground to the lower end of the rotating body 1 on the traveling body 2 increases, as shown in FIG.
Refueling from the ground, changing engine oil,
Work such as replenishing engine coolant becomes difficult.
For this purpose, a maintenance panel 3, which connects the ends of various hoses such as a fuel supply hose, an engine oil supply hose, and an engine cooling water hose, is rotatably installed on the revolving structure 1, and is used to replenish fuel, engine cooling water, and the engine. When changing the oil or the like, the maintenance panel is rotated downward so that these operations can be easily performed from the ground.

However, no consideration was given to the rotation lock of the rotating structure 1 when the maintenance panel was rotated downward.

[Problem that the invention seeks to solve]

In the above conventional technology, no consideration is given to the rotation lock of the rotating structure when the maintenance panel 3 is rotated downward, so the operator may accidentally turn the rotating structure while the maintenance panel 3 is rotating downward. If a turning operation is performed, there is a problem in that the maintenance panel 3 collides with the traveling body 1, causing damage to the maintenance panel 3.

SUMMARY OF THE INVENTION An object of the present invention is to provide a locking device for a revolving body in a construction machine that can prevent the maintenance panel from being damaged by locking the rotating movement of the revolving body when the maintenance panel is rotated downward. be.

[Means for solving problems]

The above purpose is to support the maintenance panel so that it can rotate vertically around a fulcrum pin attached to the revolving structure, while also being attached to the revolving structure to move the maintenance panel to a storage position on the revolving structure and rotating downward. Location (location for refueling, oil change, cooling water replenishment, etc.)
a hydraulic cylinder that rotates the maintenance panel downward; a directional control valve that switches the direction of pressure oil from the hydraulic source to an extension side oil chamber and a contraction side oil chamber of the hydraulic cylinder; This is achieved by having a configuration including a limit switch that is activated when the limit switch is activated, and a locking switching valve that is provided in the operating circuit of the hydraulic motor for turning the revolving body and that can be switched to lock the operating circuit when the limit switch is activated. .

[Effect]

When the directional control valve of the hydraulic cylinder is switched to a position that connects the hydraulic pressure source and the extension side oil chamber of the hydraulic cylinder, the hydraulic cylinder is extended and the maintenance panel is rotated to the downward rotation position. At the same time, the limit switch is activated, and the locking switching valve of the operating circuit is switched to lock the operating circuit, that is, the swing hydraulic motor cannot operate. Also,
When the directional control valve is switched to a position that connects the hydraulic pressure source and the contraction-side oil chamber of the hydraulic cylinder, the hydraulic cylinder performs a contraction operation and the maintenance panel rotates toward the storage side. Then, at the same time as the maintenance panel is rotated to the retracted position, the limit switch is deactivated, the locking switching valve is switched to the unlocking position, and the swing hydraulic motor is ready to operate. in this way,
When the maintenance panel is rotated downward, the operating circuit of the hydraulic motor for rotating the revolving body can be locked, so it is possible to prevent the maintenance panel from colliding with the traveling body, thereby preventing damage to the maintenance panel.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Fig. 1 is a hydraulic circuit diagram of a locking device for a rotating body according to the present invention, Fig. 2 is a side view showing the maintenance panel in a retracted state, and Fig. 3 is a side view showing the maintenance panel in a downwardly rotated state. It is. In FIGS. 2 and 3, the maintenance panel 3 is
It is supported so as to be able to rotate vertically around a fulcrum pin 4 supported on the fulcrum pin 4, and a fuel supply hose 5 from the fuel tank, an engine oil supply hose, and an engine cooling water supply hose (not shown) are mounted on the tip side. ) and other hose ends are joined together.
A self-sealing quick coupler 6 is attached to the end of the fuel supply hose 5 for connecting a fuel supply hose from a fuel tanker. A hydraulic cylinder 7 is attached to the revolving body 1 via a pin 8, and the tip end of a piston rod 7a of the hydraulic cylinder 7 is connected to an intermediate portion of the maintenance panel 3 by a pin 9. When the hydraulic cylinder 7 is extended, the maintenance panel 3 is rotated downward from the storage position shown in FIG. 2 as shown in FIG. 3, and when the hydraulic cylinder 7 is contracted, the maintenance panel 3 is rotated upward. be rotated to Further, the revolving body 1 is provided with a limit switch 10. This limit switch 10 is
When the maintenance panel 3 rotates to the storage position as shown in Figure 2 and comes into contact with the maintenance panel 3, it becomes deactivated (contacts open), and the maintenance panel 3 rotates downward as shown in Figure 3 and becomes deactivated. Activates upon contact (closes contact)
I'm starting to do that.

In FIG. 1, the hydraulic circuit of the hydraulic cylinder 7 uses a pilot hydraulic pump 12 of the operating circuit of the swing hydraulic motor 11, which will be described later, as a hydraulic power source, and there is a directional control between the pilot hydraulic pump 12 and the hydraulic cylinder 7. An electromagnetic switching valve (hereinafter referred to as electromagnetic valve) 13 is provided as a valve. The solenoid valve 13 is located at a position where the pilot hydraulic pump 12 and the contraction side oil chamber (rod side oil chamber) of the hydraulic cylinder 7 are connected, and at a position where the pilot hydraulic pump 12 and the extension side oil chamber (head side oil chamber) of the hydraulic cylinder 7 are connected. and solenoid 1.
3a is connected to an electric circuit 15 having a switch 14. Then, when the switch 14 is turned ON and the solenoid 13a of the solenoid valve 13 is energized, the solenoid valve 13 is switched to position B, and the switch 1
4 is turned off to demagnetize the solenoid 13a,
The solenoid valve 13 is switched to position A by the force of a spring 16. On the downstream side of the electromagnetic valve 13, a pilot check valve is provided in the supply/discharge circuit connected to the extension side oil chamber of the hydraulic cylinder 7 and the supply/discharge circuit connected to the contraction side oil chamber to prevent the flow toward the electromagnetic valve 13 side. 17a and 17b are provided, respectively. Pilot hydraulic pump 12 and solenoid valve 1
A variable throttle 18 for controlling the speed of the hydraulic cylinder 7 by restricting the flow rate is interposed in the circuit between the hydraulic cylinder 7 and the hydraulic cylinder 7.

On the other hand, the operating circuit for the swing hydraulic motor 11 controls the direction of the pressure oil from the hydraulic pump 19 using the direction control valve 20.
By switching the swing hydraulic motor 11
At the same time, the pilot pressure oil from the pilot hydraulic pump 12 is switched by a swing operation pilot valve (hereinafter referred to as swing operation valve) 21 to one pressure receiving part of the directional control valve 20. Alternatively, it is made to act on the other pressure receiving part to perform switching control of the directional control valve 20. In this operating circuit, the swing hydraulic motor 1
An electromagnetic locking switching valve 22 is provided in the circuit between the directional control valve 1 and the directional control valve 20. This locking switching valve 22 is located at a position where the directional control valve 20 and the swing hydraulic motor 11 communicate with each other.
The solenoid 22a is connected to an electric circuit 23 having a contact 10a of the limit switch 10 shown in FIG. And the contact 10
a turns on and solenoid 2 of locking switching valve 22
When 2a is energized, the locking switching valve 22 is switched to position ``N'', and when the contact 10a is turned OFF and the solenoid 22a is demagnetized, the locking switching valve 22 is switched to position ``h'' by the spring force of the spring 24. It's starting to switch.

In FIG. 1, reference numeral 25 indicates a power source for the electric circuits 15 and 23, and reference numeral 26 indicates a relief valve for setting the pressure of the pilot hydraulic circuit in the operating circuit.

Next, the operation of this embodiment will be explained.

When the switch 14 is turned ON, the solenoid valve 13 is switched to position RO, the pilot hydraulic pump 12 and the extension side oil chamber of the hydraulic cylinder 7 are connected, the piston rod 7a of the hydraulic cylinder 7 is extended, and the maintenance panel 3 is moved to the third position. Rotate to the downward rotation position as shown in the figure. At the same time, contact 1 of limit switch 10
0a turns on, the locking switching valve 22 switches to position 2, and the swing hydraulic motor 11 and the direction control valve 2
0 is cut off, and the turning hydraulic motor 11 becomes inoperable, that is, the turning of the rotating structure 1 is locked.

Next, when the switch 14 is turned OFF, the solenoid valve 13
is switched to position A by the spring force of the spring 16, the pilot hydraulic pump 12 and the contraction side oil chamber of the hydraulic cylinder 7 are connected, the piston rod 7a of the hydraulic cylinder 7 is contracted, and the maintenance panel 3 is moved as shown in FIG. The revolving body 1 is rotated to the storage position as shown in FIG. At the same time, the contact 10a of the limit switch 10
OFF, the lock switching valve 22 is switched to position C by the spring force of the spring 24, and the swing hydraulic motor 1 is turned OFF.
1 and the direction control valve 20 are in communication, and the swing hydraulic motor 11 is ready to operate, that is, the swing body 1
The turning lock is released.

Therefore, in this embodiment, when the maintenance panel 3 rotates downward, the rotation of the rotating body 1 is locked, so that collision of the maintenance panel 3 with the traveling body 2 can be prevented, and the maintenance panel 3 damage can be prevented.

In addition, in this embodiment, the pilot hydraulic pump 1, which is the hydraulic pressure source for the hydraulic cylinder 7, is
2 is stopped, the oil in the extension side oil chamber and contraction side oil chamber of the hydraulic cylinder 7 is prevented from flowing toward the solenoid valve 13 side by the pilot check valves 17a and 17b, so the maintenance panel 3 is It is held in the pivoted and retracted positions.

FIG. 4 shows another embodiment of the present invention, in which a locking switching valve 27 is provided in the pilot circuit between the swing operation valve 21 and the directional control valve 20, and when the maintenance panel 3 rotates downward, the locking switching valve 27 is provided. The solenoid valve 27 cuts off the pilot circuit and makes the directional control valve 20 inoperable. To explain in detail,
The lock switching valve 27 has a position H for communicating with the pilot circuit and a position H for disconnecting the pilot circuit, and connects the solenoid 27a to the electric circuit 2 having the contact 10a of the limit switch 10.
It is connected to 3. Then, contact 10a is ON
When the solenoid 27a of the locking switching valve 27 is energized, the locking switching valve 27 is switched to the LOCK position, and when the contact 10a is turned OFF and the solenoid 27a is demagnetized, the locking switching valve 27 is energized. The spring force of the spring 28 causes the switch to position E.

In this embodiment as well, the same functions and effects as described above can be achieved.

In each of the embodiments described above, the pilot hydraulic pump 12 in the operation circuit of the swing hydraulic motor 11 is used as the hydraulic pressure source for the hydraulic cylinder 7, but it is also possible to use a dedicated hydraulic source. good. In this case, the variable diaphragm 18 can be omitted.

〔Effect of the invention〕

According to the present invention, when the maintenance panel is rotated downward, the rotation of the rotating body is locked, so it is possible to prevent the maintenance panel from colliding with the traveling body.
Damage to the maintenance panel can be prevented.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a hydraulic circuit diagram of a locking device for a revolving body according to the present invention, FIG. 2 is a side view showing a maintenance panel in a retracted state, and FIG. FIG. 3 is a side view showing the maintenance panel in a downwardly rotated state, FIG. 4 is a circuit diagram showing another embodiment of the present invention, and FIG. 5 is a side view showing the main body of the hydraulic excavator. DESCRIPTION OF SYMBOLS 1... Revolving body, 3... Maintenance panel, 4... Fulcrum pin, 5... Fuel supply hose, 7... Hydraulic cylinder, 10... Limit switch, 10a... Contact, 11... Hydraulic motor for swing, 12 ...Pilot hydraulic pump, 13...Solenoid switching valve, 14...
...Switch, 17a, 17b...Pilot check valve, 18...Variable throttle, 20...Direction control valve, 21...Pilot valve for swing operation, 22,2
7...Electromagnetic lock switching valve.

Claims (1)

[Scope of Claims] 1. A revolving body is installed on a traveling body so as to be able to rotate, and a maintenance panel in which ends of various hoses such as a fuel supply hose, an engine oil refueling hose, and an engine cooling water supply hose are connected is attached to the revolving body. In the construction machine, the maintenance panel is supported so as to be vertically rotatable about a fulcrum pin attached to the revolving structure, and the maintenance panel is mounted on the revolving structure and the maintenance panel is placed in a storage position on the revolving structure. and a hydraulic cylinder for rotating to a lower rotational position, a direction control valve for switching the direction of pressure oil from a hydraulic source to an extension side oil chamber and a contraction side oil chamber of the hydraulic cylinder; The maintenance panel is equipped with a limit switch that is activated when the maintenance panel is rotated downward, and a locking switching valve that is provided in the operating circuit of the hydraulic motor for rotating the rotating body and that can be switched to lock the operating circuit when the limit switch is activated. A locking device for a revolving body in a construction machine. 2. When the directional control valve of the hydraulic cylinder is energized, it is switched to a position that connects the hydraulic pressure source and the extension side oil chamber of the hydraulic cylinder, and when demagnetized, it is switched to a position that connects the hydraulic pressure source and the contraction side oil chamber of the hydraulic cylinder. A locking device for a revolving body in a construction machine according to claim 1, comprising an electromagnetic switching valve that is switched to a connected position. 3. The lock switching valve is interposed in a circuit between the swing hydraulic motor and the directional control valve in the operating circuit, and is switched to a position where the swing hydraulic motor and the directional control valve are communicated when the limit switch is not activated. 2. A locking device for a rotating body in a construction machine according to claim 1, wherein when the limit switch is activated, the rotating motor and the directional control valve are switched to a position where the rotation control valve is shut off. 4. The lock switching valve is interposed in a pilot circuit between the swing operation pilot valve and the directional control valve in the operating circuit, and communicates the swing operation pilot valve and the directional control valve when the limit switch is not activated. 2. A locking device for a revolving body in a construction machine according to claim 1, wherein when the limit switch is activated, the locking device is changed to a position where a pilot valve for swing operation and a directional control valve are shut off. 5. A pilot hydraulic pump in the operating circuit is used as a hydraulic pressure source for the hydraulic cylinder,
A construction machine according to claim 1, characterized in that a variable throttle for controlling the speed of the hydraulic cylinder is interposed in the circuit between the hydraulic pump and the electromagnetic switching valve. Locking device for rotating body.