JPS6011918Y2 - Vehicle-shaped crane - Google Patents

Description

[Detailed description of the invention] This invention relates to a vehicle-type crane used for construction work, civil engineering work, cargo handling work, etc.

In a vehicle type crane such as a truck crane or a self-propelled crane, a swivel base is provided on the vehicle body so that it can rotate.
This swivel base is equipped with a boom and a driver's seat. During crane work, the engine drives a hydraulic pump, and the oil supplied from this hydraulic pump is used to drive the swivel base's swivel drive hydraulic motor, the boom's telescoping cylinder, the luffing cylinder, etc. It is used as an operating source to operate the crane from the driver's seat.

However, in this type of vehicle-type crane, the engine and the like mounted on the vehicle body side are sometimes arranged so as to protrude above the swivel surface of the swivel table due to the space limitations of the vehicle body.

For this reason, the turning radius of the swivel base is regulated to avoid the above engine, but if you turn with the driver's door open, the turning radius will increase by the amount of this door. There is a drawback of collision in the room.

If the door hits the engine, the door may be damaged or fall off.

This idea was developed based on these circumstances, and its purpose was to create a vehicle shape that would prevent the swivel base from turning if the driver's door was open, which would not damage the door. Our goal is to provide cranes.

An embodiment of this invention will be described below based on drawings in which it is applied to a self-propelled crane.

In FIGS. 1 and 2, 1 is a vehicle body, which has a front wheel 2 as a steering wheel and a rear wheel 3 as a driving wheel.

An engine 4 is mounted on the vehicle body 1 and is housed in an engine room 5.

Note that 6 indicates an outrigger.

Reference numeral 7 denotes a swivel base that is rotatably provided on the vehicle body 1, and a driver's seat 8 is placed on the swivel base 7, offset to one side.

This driver's seat 8 has a door 10 on its side that can be opened and closed via a hinge 9, and the driver opens this door 10 to enter and exit the driver's seat 8.

Reference numeral 11 denotes a multi-stage telescoping boom attached to the swivel base 7, and is raised and lowered by a lifting cylinder 12.

A telescopic cylinder (not shown) is accommodated in the boom 11, and allows the boom 11 to extend and contract.

13 is a hook, which is hung by a wire 14.

The wire 14 is wound up by a winch (not shown).

The engine room 5 is projected so as to be located above the turning surface of the swivel base 7, and therefore the rear part of the swivel base 7 avoids the engine room 5 and extends upward.

When the crane is traveling, the power from the engine 4 is transmitted to the rear wheels 3, which are operated from the driver's seat 8.

Further, during crane work, a hydraulic pump is driven by the power of the engine 4, and the pressure oil generated by this pump is supplied to each of the undulation cylinders 12, telescopic cylinders, and a swing hydraulic motor to be described later.

Thus, the swivel table 7 is operated by a hydraulic system as shown in FIG.

That is, 20 in the figure is a hydraulic pump that uses the engine 4 as a power source.

Pressure oil pumped from the hydraulic pump 20 is guided to the swing control valve 21 through a pipe 40.

This swing control valve 21 is operated by an operating lever 22 located on the driver's seat 8.

The swing control valve 21 is a 4-point/3-position switching valve, and when the operating lever 22 is operated, the pressure oil pumped from the hydraulic pump 20 is pumped to the swing hydraulic motor 23 via a pipe 41 or 42. or return it to the oil tank 24 side via the pipe line 43.

The swing hydraulic motor 23 drives the swing table 7 to swing. For example, when pressure oil flows in through the pipe 41, the swing hydraulic motor 23 swings the swing table 7 clockwise in FIG. When the pressure oil flows in, the swivel table 7 is rotated counterclockwise in FIG.

A pipe line 4 branched from the pipe line 40 and connected to the pipe line 43
A switching valve 25 is inserted in the middle of 4, and this switching valve 25 responds to the swing control valve 21.

The switching valve 25 is opened and closed so as to return the pressure oil from the hydraulic pump 20 to the oil tank 24 when the swing control valve 21 is in the neutral position.

26 is a relief valve, and this relief valve 26
is arranged in the middle of a pipe line 45 that is branched from the middle of the pipe line 40 and connected to the pipe line 43, and is automatically activated when the pressure oil on the swing hydraulic motor 23 side reaches a specified pressure or higher through the swing control valve 21. Pressure oil is released to the oil tank 24 side through the pipe line 43.

27 is a filter.

Reference numeral 28 denotes a door switch for the driver's seat 8. This door switch 28 is composed of, for example, a limit switch or the like, and opens and closes energization to a relay coil 29a of a relay circuit 29.

30 is a room lamp installed on the ceiling of the driver's seat 8, for example.

The room lamp 30 is connected to one relay switch 29b of the relay circuit 29.

Also, the other relay switch 29c of the relay circuit 29
is connected to the solenoid valve 31.

One port 31a of this solenoid valve 31 is connected to the oil tank 24 via a pipe 46, and the other port 31a is connected to the oil tank 24 via a pipe 46.
1b is connected to the vent of the relief valve 26 via a conduit 47.

32 is a power source for operating the door switch, and 33 is a fuse.

The operation of one embodiment configured as described above will be explained.

First, when the door 10 of the driver's seat 8 is closed, the door switch 28 is in the off state shown by the dotted line in FIG. 3, and in this state, the relay coil 29a of the relay circuit 29
No electricity flows from the power supply 32.

Therefore, the relay switches 29b, 2 of the relay circuit 29
Since 9c is in the state shown by the dotted line, the Tsuremade valve 31 is also not energized.

Therefore, the solenoid valve 31 is in a closed state.

That is, when the door 10 is closed, the pressure oil from the hydraulic pump 20 is supplied to the swing control valve 2 by operating the operating lever 22, as in the conventional case.
1 to rotate the swivel table 7 by driving the swivel hydraulic motor 23 or to return the oil to the oil tank 24.

However, when the door 10 is in the open state, the door switch 28 is in the on state shown by the solid line in FIG.
The relay coil 29a of the relay circuit 29 is energized, and the relay switches 29b and 29c of the relay circuit 29 are in the state shown by the solid line.

In this case, electricity flows from the power supply 32 to each of them, lighting up the room lamp 30 and turning on the solenoid valve 3.
Activate 1.

Therefore, the vent of the relief valve 26 is opened to the oil tank 24 via the solenoid valve 31, and this connection,
The pressure oil fed from the hydraulic pump 20 is released from the relief valve 26 to the oil tank 24, so the operating lever 22
Even if the swivel table 7 is operated, it is not force-fed to the swivel hydraulic motor 23 via the swivel control valve 21, and the swivel base 7 does not rotate.

As mentioned above, in one embodiment of this invention, the driver's seat 8
If the door 10 is not closed, the swivel base 7 will not be able to turn, and a self-propelled crane will be obtained in which the door 10 will not be damaged by this turning.

Further, since the room lamp 31 is arranged on the ceiling of the driver's seat, it is easy to check when the door 10 is opened or closed.

Note that this invention is not limited to the above embodiment.

For example, from the solenoid coil 31 to the relief valve 2
The pipe line 47 connected to the valve 6 does not necessarily need to be connected to the vent of the relief valve 26, and can be connected anywhere in the pipe line 40 between the hydraulic motor 20, the swing control valve 21, and the relief valve 26. produce an effect.

However, in this case, the capacity of the solenoid valve 31 must be increased, and the diameters of the conduit 47 and the conduit 46 must be increased.

Further, in this embodiment, a self-propelled crane is described in which the driver's seat 8 is shared during traveling and during crane work, but a dedicated driver's seat is provided for both traveling and crane work. It can also be carried out with a truck crane in which the driver's seat for crane work is installed on the swivel platform, and even in this case, if the door of the driver's seat during crane work is not closed using the same method as above, the swivel base will be closed. The same result can be obtained by not being able to turn.

Furthermore, since the swivel base 7 is rotated with the door 10 open, the engine room 5 is not the only area that the door 10 collides with.

For example, even though the engine room 5 does not protrude above the revolving surface of the revolving base 7, in the truck crane described above, which has a dedicated driver's seat for both traveling and crane work, In some cases, the driver's seat, etc. when traveling protrudes, and in this case, when the swivel platform rotates with the door of the driver's seat open during crane work, the door can be moved to the driver's seat, etc. when traveling. may collide with other objects, resulting in damage and falling off.

Therefore, in the above case as well, the same effect can be obtained by using the same means as the swivel base cannot turn unless the door of the driver's seat is closed during the crane work.

As mentioned above, this invention detects when the driver's door of a vehicle crane is open, and in this case, stops supplying oil to the swing hydraulic motor from the hydraulic pump driven by the engine. Since the swivel base is made unswivelable, it is possible to obtain a vehicle-type crane in which the swivel base is not rotated and the door is damaged when the door is opened, unlike in the past, and its practical effects are great. .

[Brief explanation of drawings]

The drawings show one embodiment of this invention. Fig. 1 is a side view of the self-propelled crane, Fig. 2 is a plan view showing the crane in operation, and Fig. 3 is a circuit diagram. 1...Car body, 4...Engine, 5...
...Engine room, 7...Swivel base, 8.
...Driver's seat, 9...Hinges, 10...
...Door, 11...Multi-stage telescoping boom, 20
... Hydraulic pump, 21 ... Swing control valve, 22 ... Operation lever 23 ...
... Swing hydraulic motor, 24 ... Oil tank,
25...Switching valve, 26...Relief valve, 28...Door switch, 31...
・Solenoid valve.

Claims (1)

[Scope of utility model registration request] A swivel base is rotatably provided on a vehicle body on which an engine is mounted, and the swivel base is equipped with a boom and a driver's seat, and various members provided on the vehicle body side protrude above the swivel surface of the swivel base. In the vehicle type crane, the door opening/closing detection device detects the opening/closing of the door of the driver's seat, and in response to the operation of the swivel base rotation control lever, pressure oil from the hydraulic pump driven by the engine is used as the swivel base rotation hydraulic pressure. a device that is added to a hydraulic circuit that supplies the motor to a device that prevents the supply of pressure oil from the hydraulic pump to the swivel hydraulic motor when the door opening/closing detection device detects that the door is open; A vehicle-shaped crane characterized by: