JPH0367164B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a hydraulic power unit system for a crane vehicle. More specifically, the present invention relates to a hydraulic power unit system for a crane vehicle for reducing noise generated from a hydraulic system and engine used in the crane vehicle.

[Background Art] The present inventor has proposed a new pile driving method using a wheeled crane vehicle in Japanese Patent Application No. 58-226461 (Japanese Patent Publication No.
No. 36088) and was registered. This wheel crane pile driving method uses a traction device, that is, a hydraulic device that also serves as a luffing cylinder, to generate vertical pressing force at the tip of the boom to advance excavation with a spiral screw. This pile driving method using a wheeled crane requires a hydraulic system to generate a large pressing force.

The crane truck used in this construction method switches the output of the traveling engine during pile driving work, and uses this engine to drive the hydraulic system for driving the crane. Therefore, the noise of the engine during pile driving was unavoidable. In particular, the noise generated during piling work in urban areas must be avoided as much as possible.

[Problems to be Solved by the Invention] This invention was invented against the above technical background, and achieves the following objects.

An object of the present invention is to provide a hydraulic power unit system for a crane vehicle for reducing noise generated by the hydraulic system of the crane vehicle.

An object of the present invention is to provide a hydraulic power unit system for a crane truck that can be attached to and detached from the crane truck.

[Means for Solving the Problems] The present invention takes the following measures to solve the problems described above.

A crane vehicle equipped with a hydraulic system driven by an engine for use in pile driving, etc., and a hydraulic power unit that is detachably installed on the body of the crane vehicle outside the hydraulic system and is unitized. A motor that is rotated by being supplied with power from a nearby power source and has output shafts at both ends, and b. A plurality of motors provided on each of the output shafts at both ends of the motor. (c) a quick joint connected to each of the hydraulic pumps for supplying hydraulic pressure to the crane vehicle via hydraulic piping; and a quick joint connected to each of the hydraulic pumps for supplying hydraulic pressure to the crane vehicle via hydraulic piping; This is a hydraulic power unit system for a crane truck, consisting of a mounting base and a mounting base.

[Operation] While the crane truck is traveling to a work site, the hydraulic power unit 1 is removed from the mounting base (bracket) 20 and transported by another vehicle or while being mounted on the crane truck. Upon arrival at the work site, the hydraulic power unit 1 is attached to the bracket 20 of the crane truck.
will be loaded on. When the hydraulic power unit 1 is installed, the hydraulic piping is connected to the quick joints 16a, 16b, and 17. Electric power is supplied to the electric motor 5 from the applied power line or generator, and the hydraulic power unit 1 is put into operation.

[Example] Hereinafter, an example in which the present invention is applied to a wheel crane pile driver will be described with reference to the drawings.
Figure 1 is a diagram showing the arrangement of the hydraulic power unit and wheel crane during pile driving work using a wheel crane, and Figure 2 is an internal layout diagram showing an overview of the internal arrangement of the hydraulic power unit. FIG. 3 is a diagram showing the internal hydraulic circuit of the hydraulic power unit.

The wheel crane vehicle has an engine and tires of 26
It is equipped with the following features and can run on its own. The wheel crane vehicle is equipped with a swivel platform on the chassis 27 that rotates around a vertical axis. The swivel table can rotate 360 degrees around the vertical axis within the swivel tube 25. On the swivel table,
A driver's cab (not shown), a telescopic boom 21, a hoisting cylinder 22, and the like are provided. Telescopic boom 2
The length of 1 is extendable and retractable by a cylinder device provided inside the holder, and the base thereof is rotatably provided on a swivel base.

Therefore, the tip of the telescopic boom 21 is moved up and down with respect to the ground surface. An earth auger device 23 for rotationally driving the spiral screw is attached to the tip of the telescopic boom 21.
A spiral screw casing 24 is attached to the lower end of the earth auger device 23. Further, a undulating cylinder 22 is provided between the telescopic boom 21 and the chassis 27, and the undulating cylinder 22 forcibly moves the telescopic boom 21 up and down.

To drill a hole in the ground, the spiral screw is rotated by the earth auger device 23, and the telescopic boom 21 is pulled by the undulating cylinder 22.
From its tip via the earth auger device 23,
Excavation is performed by forcibly pressing the spiral screw. The chassis 27 of the wheel crane vehicle is provided with a hydraulic system (not shown) for driving the crane.

The hydraulic system is driven by an engine mounted on the chassis 27. The hydraulic system is used as a power source for extending and retracting the telescopic boom 21, turning the swivel base, and winching operations for suspending piles, screw casings 24, etc. from the upper end of the telescopic boom 21.

A bracket 20 is integrally provided on a chassis 27 at the rear of the wheel crane vehicle. The bracket 20 is used to removably mount the hydraulic power unit 1, which is separate from the one provided on the wheel crane vehicle. Hydraulic power unit 1
The system basically has the same function as the hydraulic system installed in a wheel crane, but the former is driven by the engine of the wheel crane, and the latter is an electric motor driven by another applicable power source. They differ greatly in one respect.

The hydraulic power unit 1 is housed in a box-shaped case. The hydraulic power unit 1 may be mounted on the bracket 20, or may be placed at a location separate from the wheel crane vehicle. The hydraulic power unit 1 has a cord 2 connected from the power line to the electric motor 5.
8. Hydraulic power unit 1 is supplied with hydraulic oil through a connecting pipe 11 from a hydraulic oil tank (oil reservoir) of a wheel crane vehicle, that is, a container that stores hydraulic oil for a hydraulic circuit. Pressurized hydraulic oil is supplied to the wheel crane vehicle via a hydraulic hose 29.

The hydraulic oil from the connecting pipe 11 is supplied to the gate valve 2,
Three gear pumps 6,
7,7. The gear pumps 6, 7, 7 are
Couplings 18a, 18 by one electric motor 5
They are simultaneously driven by b.

This electric motor 5 is equipped with output shafts on both sides. On the other hand, this output shaft has a coupling 18
A gear pump 6 is connected to the other output shaft through a coupling 18a, and two gear pumps 7, 7 are connected to the other output shaft through a coupling 18a. The gear pump 6 and the gear pump 7 are different in the pressure and capacity of the hydraulic pressure generated. The pressure and capacity of the operating oil used in wheel cranes vary depending on the equipment used.

Moreover, even if one of the gear pump 6 or the gear pumps 7, 7 fails, one of them remains movable, so that the wheel crane vehicle can be operated at a minimum. For example, if one gear pump breaks down during work,
The boom can be temporarily evacuated to a safe position by activating the other gear pump.

The pressurized hydraulic fluid exiting the gear pumps 6, 7, 7 passes through hose assemblies 14, 15, 15, is supplied to check valves 8a, 8b, 9, and is connected to a quick fitting 16a. ,16b,1
7. Quick joints 16a, 16b, 17
is of a known structure that supplies hydraulic pressure to the outside when connected, but does not discharge hydraulic pressure when disconnected.

Hydraulic oil pressurized by each gear pump 6, 7, 7 is connected to relief valves 10a, 10b, 10c. . Relief valves 10a, 10b, 10c
is a valve that releases part or all of the oil to the return side when the pressure in the hydraulic circuit reaches the set value of the valve, thereby limiting the pressure in the hydraulic circuit to below the set value. Further, the oil pressure of the gear pumps 6, 7, 7 is connected to pressure gauges 13a, 13b, 13c via stop valves 12a, 12b, 12c, and the pressure thereof is measured.

Operation The hydraulic power unit system for the crane truck of this embodiment is used as follows.

While the crane truck is traveling to a work site, the hydraulic power unit 1 is removed from the bracket 20 and transported by another vehicle or mounted on the crane truck. Upon arrival at the work site, the hydraulic power unit 1 is loaded onto the bracket 20 of the crane vehicle 1. When the hydraulic power unit 1 is installed, the hydraulic piping is connected to the quick joints 16a, 16b, and 17. Electric power is supplied to the electric motor 5 from the applied power line or generator, and the hydraulic power unit 1 is put into operation.

Therefore, the engine of the crane truck is stopped, and the power is transferred to the engine, and the electric motor 5 takes charge of the pile driving operation. Further, in a site where noise is a problem, the hydraulic power unit 1 can be removed from the bracket 20 and placed in a place where the influence of noise is relatively low.

[Effects of the Invention] Since the present invention is as described above, it has the following effects and advantages.

a Excavation using the hydraulic system mounted on the crane truck,
Compared to conventional engine-powered construction methods and equipment for driving piles, driving steel sheet piles, etc., the noise of the electric motor and hydraulic system is lower, so the construction method can be applied to work in urban areas.

b. In areas where some noise is not a problem, the hydraulic power unit can be removed and a hydraulic system mounted on a hydraulic crane truck can be used.

c Since different hydraulic pumps are placed on both shafts of one electric motor, the crane truck can be used even if one hydraulic pump breaks down.

d) Since the vehicle chassis is provided with a mounting base for mounting the hydraulic power unit, a crane truck can be mounted to carry out work when there is little work space and low noise is required.

[Brief explanation of drawings]

FIG. 1 is a side view of the embodiment of the present invention showing the working state, FIG. 2 is an internal layout diagram of the hydraulic pump device, and FIG.
The figure is a hydraulic circuit diagram of the main parts. 1... Hydraulic power unit, 2... Gate valve, 3... Suction filter, 4... Pump connector, 5... Electric motor, 6, 7... Gear pump, 8a, 8b, 9... Check valve, 10a,1
0b, 10c...Relief valve, 11...Connecting pipe,
12a, 12b, 12c...stop valve, 13
a, 13b, 13c...pressure gauge, 14, 15...
Hose assembly, 16a, 16b, 17...
...Rapid connector, 18...Coupling, 19...Electric cord inlet, 20...Bracket, 21...Telescopic boom, 22...Luffing cylinder, 23...Earth auger, 24...Spiral screw casing, 25 ...Swivel tube, 26...Tire, 2
7...Car chassis, 28...Electric cord, 29...Hydraulic hose.

Claims (1)

[Scope of Claims] 1. A crane truck equipped with a hydraulic system driven by an engine for use in pile driving, etc.; and a crane truck that is detachably installed on the body of the crane truck outside of the hydraulic system, and that is integrated into a unit. A hydraulic power unit having the following requirements a, b, and c: a. An electric motor that is rotated by being supplied with electric power from a nearby power source and has an output shaft at both ends; b. The output at both ends of the electric motor. a plurality of hydraulic pumps respectively installed on the shaft; c. a quick joint connected to each of the hydraulic pumps for supplying hydraulic pressure to the crane truck via hydraulic piping; and a hydraulic power unit removably mounted. A hydraulic power unit system for a crane vehicle, which comprises a mounting base provided on the crane vehicle for the purpose of carrying out the operation.