JPH0412991A - Operating device for truck crane - Google Patents

Abstract

PURPOSE:To improve the operation performance an facilitate the complex operation by providing a joy stick operating valve mechanism for crane operation, for operating, with spool operating rods, spools arranged longitudinal and laterally and installing a switch for on-load of the working hydraulic pressure in an operation part. CONSTITUTION:A joy stick operating valve mechanism is equipped with direction control valves 1a and 1b for boom extension/contraction and direction control valves 2a and 2b for winch raising/lowering, longitudinally and laterally, and spool operating rods 3 which have levers 4 and push in the spools of direction control valves and can be tilted in all the circumferential directions are installed. A push button switch 7 for on-loading is installed in the handle part of the lever 4, and an electromagnetic opening/closing valve 9 of working oil pressure circuit which starts from a oil hydraulic pressure source 8 leads to each direction control valve is closed by pushing the pushing button switch 7 by fingers, and the pilot oil pressure is on-loaded in each direction control valve. Accordingly, the extremely superior operation performance is achieved, also the complex operation can be achieved easily, and the compact structure can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an operating device with excellent operability used for operating a truck crane (including a crane truck).

[Conventional technology]

Conventional truck crane operating devices are equipped with stacked hydraulic control valves, with operating levers facing the operating spools of each valve, and it has become common practice to arrange these operating levers in a line. There is.

[Problem to be solved by the invention]

By the way, the conventional operating device is widely used because it has a simple and clear form and has certain advantages, but it also has the following disadvantages.

■ Normally, control levers are located on both sides of the vehicle.
When a lever is operated on one side, it is necessary to operate the lever on the opposite side at the same time, and since most of the levers are connected by connecting rods, there are many defects in appearance and design limitations.

■ Due to the large number of control levers, when performing multiple operations at the same time, it is necessary to spread out your palms and move two or three control levers in the same direction, or use both hands to operate them. There were some inconveniences.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a truck crane operating device that eliminates the above-mentioned conventional disadvantages, greatly improves operability, and allows multiple operations to be easily accomplished.

[Means to solve the problem]

The present invention has hydraulic control valves for crane operation arranged on the front, rear, left and right sides, a joystick operating valve mechanism in which the spools of these hydraulic control valves are operated by spool operating rods, and an on-load of working hydraulic pressure in the operating section. The truck crane operating device is characterized in that a switch for on-loading the hydraulic pressure is installed in the handle of the spool operating rod, or the inclination angle of the spool operating rod is constant. It is characterized by being installed so that it is pressed when the value is exceeded.

[For production]

In the present invention having the above configuration, after the hydraulic pressure is loaded onto the hydraulic pressure control valve by pressing the on-load switch, the spool operating rod is tilted in an appropriate direction to move the spool of the desired hydraulic control valve forward or backward. Converts hydraulic pressure and allows the crane to perform specified operations. Such joystick type operations have extremely good operability and can easily perform complex operations.

Therefore, in order to provide functions equivalent to two series of conventional stacked hydraulic control valves, two sets of joystick operating valve mechanisms of the present invention are required. In other words, one set of joystick-operated valve mechanisms has two hydraulic control valves for boom extension and contraction, two hydraulic control valves for winch up and down, arranged on the front, rear, left and right sides, two for boom hoisting, and two for boom rotation. A set of joystick-operated valve mechanisms with hydraulic control valves arranged on the front, rear, left, and right sides is configured, and the spool operating rod of one joystick-operated valve mechanism is tilted to move the spool of the desired hydraulic control valve forward and backward, allowing the boom to extend and retract and the winch to move up and down. Similarly, the other joystick-operated valve mechanism controls boom raising and lowering and boom rotation.

Furthermore, for outrigger jacking, one set of joystick operating valve mechanisms is sufficient for extending and jacking one outrigger.

The position of the hydraulic pressure on-road switch is as follows:
In order to prevent malfunctions and further improve operability, it is preferable to define as follows.

In other words, the on-load switch may be a push-button switch or the like and installed on the handle of the operating rod, and the on-load switch may be operated by pressing it with a finger, or the on-load switch may be installed below the spool operating rod and the spool It is activated by pressing a switch when the inclination angle of the operating rod exceeds a certain value.

〔Example〕

FIG. 1 is an exploded explanatory diagram of a joystick-operated valve mechanism for boom extension and contraction and winch up-and-down operation, showing one embodiment of the present invention (counterbalance valves, etc. are not shown)
The boom extension/retraction directional control valves 1a and lb and the winch up/down directional control valve 2a.

2b are arranged on the front, rear, left and right sides, and a spool operating rod (plate) 3 is provided which is tiltable in the entire circumferential direction and has a lever 4 for pushing in the spool of each of these directional control valves. It is assembled as shown in Figure 2.

A hydraulic cylinder 5 is interposed between the boom extension/retraction directional control valves 1a and 1b, and the spool operating rod 3 is operated by a lever 4.
When the spool of the directional control valve 1a is pushed forward by tilting it forward, the spool of the directional control valve 1b rises, and each directional control valve 1a
, lbO flow path switching causes the hydraulic cylinder 5 to boom (
(not shown), and by tilting the lever 4 backward, the hydraulic cylinder 5 causes the boom to retract.

On the other hand, a hydraulic motor 6 is interposed between the winch up and down directional control valves 2a and 2b, and when the spool operating rod 3 is tilted to the left with the lever 4 and the spool of the directional control valve 2a is pushed in, the directional control valve 2b is The spool rises, and by switching the flow paths of each directional control valve 2a, 2b, the hydraulic motor 6 is rotated to wind up the winch (not shown), and conversely, by tilting the lever 4 to the right, the winch is unwound. will be held.

In addition, by tilting the spool operating rod 3 in the 45'' direction using the lever 4, the spools of the boom extension/contraction directional control valve 1a and the winch up/down directional control valve 2a can be pushed in at the same time, or the spools of the boom extension/contraction directional control valve 1b and the winch up/down directional control valve 2a can be pushed in at the same time. By simultaneously pushing in the spool of the directional control valve 2b,
Extend the boom and hoist the winch at the same time, or retract the boom and rewind the winch at the same time.
Combined operations can also be easily performed.

Further, a push button switch 7 for on-road use is installed in the handle of the lever 4, and by pressing the push button switch 7 with a finger, the hydraulic pressure circuit is connected to the hydraulic pressure circuit from the hydraulic power source 8 via each of the directional control valves. Then, the electromagnetic on-off valve 9 is closed, and each directional control valve is loaded with pilot oil pressure.

Therefore, the two sets of joystick-operated valve mechanisms described above have functions equivalent to two series of conventional crane laminated hydraulic control valves.

In the figure, 10 is a supporting member of the fulcrum of the spool operating rod 3, II
indicates a relief valve.

The above embodiments are examples of joystick and control valve mechanisms for boom extension and contraction and winch up and down operation.
The joystick operating valve mechanisms for boom hoisting and boom rotation can also be configured in a similar manner.

FIG. 3 shows another embodiment of the present invention, and most of the features are the same as in the first embodiment, except that the on-road switch and chia' are connected to the spool operating rod 3 of the joystick operating valve mechanism. A suitable number of them are installed below, and a switch is pressed when the inclination angle of the spool operating rod 3 exceeds a certain value.

〔Effect of the invention〕

As described above, according to the present invention, by using a joystick-operated valve mechanism as the hydraulic control valve in a truck crane, operability is extremely excellent, complex operations can be easily achieved, and the form is compact. be able to.

[Brief explanation of the drawing]

FIG. 1 is an exploded explanatory view showing one embodiment of the invention, FIG. 2 is an assembled perspective view, and FIG. 3 is an exploded explanatory view showing another embodiment of the invention. la, lb...Directional control valve for boom expansion and contraction, 2a, 2b
... Winch up and down directional control valve, 3... Spool operating rod, 4... Lever, 5... Hydraulic cylinder, 6...
・Hydraulic motor, 7...Push button switch, 7'...
・On-road swift, hydraulic power source, 9...ii
Relief valve for electromagnetic on-off valve 10...supporting member, 11. Patent applicant Omote Iron Works Co., Ltd.

Claims (3)

[Claims] (1) Hydraulic control valves for crane operation are arranged on the front, rear, left and right sides, the spools of these hydraulic control valves are operated by a spool operating rod, and a joystick operating valve mechanism is used, and the operating section is equipped with a switch for on-loading the hydraulic pressure. A truck crane operating device characterized by being installed. (2) The truck crane operating device according to claim 1, wherein the on-load switch for the hydraulic pressure is installed in the handle of the spool operating rod. (3) The truck crane operating device according to claim 1, wherein the on-load switch for the hydraulic pressure is installed so as to be pressed when the inclination angle of the spool operating rod exceeds a certain value.