JPH0621977Y2 - Turning operation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a turning operation device for a vehicle having a turning mechanism such as a hydraulic excavating and loading work vehicle.

[Conventional technology]

Conventional swing locks of this type of swing control device include a mechanical lock system by inserting a swing lock pin and a hydraulic lock system by swing motor braking.

[Problems to be solved by the device]

In the mechanical lock method, the direction of use is limited, and it is impossible to lock at any position of 360-degree turning.

With the hydraulic lock system, it is possible to lock at any position during 360-degree turning, but when the turning motor is braked by the brake device and the turning lever is operated accidentally, the turning may start due to insufficient brake capacity. There was a nature. In addition, when a turning operation is performed in a brake locked state, the brake is pulled to make a turning movement, which causes a problem of accelerating damage to the brake lining.

[Purpose of device]

The present invention has been made in view of the above circumstances, and an object thereof is to increase the safety by issuing an alarm when the turning lever is operated by mistake while the turning motor is braked by the brake device. It is in.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a swiveling lever 18
The swing operation circuit 1 that operates the swing valve 4 to perform the swing operation of the swing motor 2 and the brake device 8 that operates the electromagnetic valve 12 to operate the swing motor 2 to brake the swing motor 2 by operating the swing lock switch 17. In the turning operation device provided,
The switch 23, which operates when the turning lever 18 of the turning operation circuit 1 is operated, and the turning lock switch 17 are provided as an alarm device A.
The electric circuit 21 of FIG.

[Action]

When the swing lock switch 17 is operated to switch the solenoid valve 12 and the swing motor 2 is braked by the brake device 8 and the swing lever 18 is operated by mistake, the swing starts due to insufficient brake capacity. The switch 23 is activated by the operation of 18, and the alarm device A gives an alarm.

〔Example〕

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

In the drawing, reference numeral 1 is an operating circuit of a swing motor 2, which is provided with a pump 24, and the discharge side of this pump 24 is connected to a pump port 4a of a swing valve 4 via a pipe line 3. The tank port 4 b of the swirl valve 4 communicates with the tank 5. Connection ports 4c, 4 of swirl valve 4
d is the ports 2a, 2 of the swing motor 2 via the pipes 6, 7.
It is connected to b. A brake device 8 is attached to the turning motor 2. The brake device 8 is a negative brake, and a piston 10 is provided in the brake cylinder 9.
Spring 1 that keeps the brake on by pressing
0'is housed. The brake device 8 is incorporated in the brake hydraulic circuit 11. This brake hydraulic circuit 11
Is provided with a solenoid valve 12, the pump port 12a of the solenoid valve 12 communicates with the discharge side of the pump 13, and the tank port 12b of the solenoid valve 12 communicates with the tank 5.
Further, the connection port 12c of the solenoid valve 12 is connected to the rod side chamber 9a of the brake cylinder 9 via a pipe line 14.

A swing lock switch 17 is provided in the electric circuit 16 of the solenoid 15 of the solenoid valve 12.

The swivel valve 4 operates to switch pilot pressure by operating a swivel lever 18, and the swivel lever 18 and the actuating portion of the swivel valve 4 are connected by pilot lines 19 and 19 '.

Reference numeral 20 in the drawing denotes an alarm buzzer which is an alarm device A. An electric circuit 21 of the alarm buzzer 20 has a switch (a hydraulic pressure taken out via a shuttle valve 25) which is operated when the swing lock switch 17 and the swing lever 18 are operated. And a pressure switch) 23 which is operated by.

The swing motor 2 is used to swing the upper swing body of the hydraulic excavation and loading work vehicle.

Next, the operation will be described.

In the state where the swing lock switch 17 is not turned on, the solenoid valve 11 is in the lower position, the discharge pressure of the pump 13 is not introduced into the rod side chamber 9a of the brake cylinder 9 of the brake device 8, and the spring 10 drives the piston 10. It moves and brakes the turning motor 2.

In this state, when the turning lever 18 is operated to operate the turning valve 4, the current from the pressure switch 23 causes the solenoid valve 12 to G.
By switching to the position, the turning operation of the turning motor 2 guides the pressure oil to the rod side of the brake cylinder 9 to release the brake.

When the swivel lock switch 17 is turned on, the solenoid valve 11 is switched and the oil in the rod side chamber 9a of the brake cylinder 9 is discharged to the tank 5 and the spring 1
The turning motor 2 is braked by the force of 0.

In this state, the pressure switch 23 operated by the operation lever is operated.
No current flows to the solenoid valve 12, the valve 12 is held in the brake position, but the swing valve 4 is switched, and the swing motor 2 is driven to start the swing operation.

In this case, the buzzer circuit 21 is connected to energize the alarm buzzer 20, and the alarm buzzer 20 issues an alarm.

[Effect of device]

As described above in detail, the swing operation device according to the present invention is configured to operate the swing valve 4 by the operation of the swing lever 18 to perform the swing operation of the swing motor 2 and the swing lock switch 17. In a swing operation device including a brake device 8 that operates the solenoid valve 12 to brake the swing motor 2, a switch 23 that operates when the swing lever 18 of the swing operation circuit 1 is operated and the swing lock switch 17 described above.
And are incorporated in the electric circuit 21 of the alarm device A.

Therefore, when the swing lock switch 17 is operated to switch the solenoid valve 12 and the swing motor 2 is braked by the brake device 8 and the swing lever 18 is operated by mistake, the swing starts due to insufficient brake capacity. The switch 23 is operated by the operation of the turning lever 18, and the alarm device A issues an alarm.

This improves safety.

The alarm means is a switch 23 and a swing lock switch 1.
7 and 7 are only incorporated in the electric circuit 21 of the alarm device A, and since the swing lock switch 17 and the switch 23 are already used parts, the manufacturing cost is reduced.

[Brief description of drawings]

The drawing is a diagram for explaining the configuration of an embodiment of the present invention. 4 is a swing operation circuit, 2 is a swing motor, 4 is a swing valve,
8 is a brake device, 12 is a solenoid valve, 17 is a swing lock switch, 18 is a swing lever, and 23 is a switch.

Claims (1)

[Scope of utility model registration request] 1. A swing operation circuit 1 for operating a swing valve 4 by operating a swing lever 18 to cause a swing motor 2 to swing.
And a brake device 8 that operates the solenoid lock valve 12 by operating the swing lock switch 17 to brake the swing motor 2, a switch 23 that operates when the swing lever 18 of the swing operation circuit 1 is operated. A turning operation device characterized in that the turning lock switch 17 and the turning lock switch 17 are incorporated in an electric circuit 21 of the alarm device A.