JPS583901Y2 - Construction machine with swivel stand - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a construction machine with a swivel platform in which a pressure oil supply device is provided on the side of the traveling truck.

Conventionally, the hydraulic circuit for construction machinery in this form is configured to drive each actuator using a parallel circuit.
The switching valves for switching on and off the drive were all located on the swivel base side.

As a result, the pressure oil supply passage from the switching valve to the travel motor and the return oil passage naturally pass through the rotary joint.

Therefore, when the pressure oil drain path is bypassed through the center of the switching valve, as shown in FIG. , and a switching valve 1 for driving the travel motor 1
It requires oil passages F and F for supplying and returning pressure oil from 9, and oil passages C, F, F for another traveling motor 1 and hydraulic pump 15 for left and right steering of the aircraft. The return oil path A
Rotary joint 13 connects 7 oil passages while also serving as
had to be set up.

For this reason, the rotary joint 13 becomes large, and when the swivel base is to be downsized, the large rotary joint becomes a constraint, making it difficult to significantly downsize the swivel base.

Furthermore, since the switching valves of each actuator are all arranged on the swivel table side, there is a disadvantage that the operation space on the swivel table is narrowed by the many switching valves, so it is necessary to secure a certain amount of operation space. This necessity makes it even more difficult to downsize the swivel base.

The purpose of this invention is to solve all of the above-mentioned constraints on the miniaturization of the swivel base, and to create a multi-function machine with a swivel base that can secure a relatively large operating space while also reducing the size of the swivel base. It is in the point of providing.

The characteristic configuration of the multi-machine with a swivel base of the present invention is that a finite swivel base is disposed on one side of a part of the traveling carriage, and a hydraulic actuator for work whose operation is controlled by a switching valve for work is placed on the side of the finite swivel base. and a switching valve thereof, and a traveling motor whose operation is controlled by the switching valve for traveling, a hydraulic pump, and the switching valve thereof are provided on the traveling bogie side, and each of the switching valves is connected in parallel to the hydraulic pump. A pressure oil supply oil passage is configured, and a part of the oil passage connecting the work switching valve and the travel switching valve of the pressure oil supply oil passage is connected via a rotary joint. be.

The effects of the characteristic configuration of the present invention are as follows.

In other words, by installing each actuator in a parallel circuit and providing the traveling motor and its switching valve on the traveling bogie side, it is necessary to provide a pressure oil supply oil path from the switching valve to the traveling motor at the rotary joint. By reducing the number of oil passages provided in the rotary joint in the hydraulic circuit, the rotary joint can be made smaller, eliminating the constraints on downsizing the swivel base, and furthermore, Since the previously provided switching valves for each traveling mode have been moved to the traveling vehicle side, a large operating space on the swivel platform can be secured, and a relatively large operating space can be secured. This also made it possible to downsize the swivel base.

Furthermore, since the smaller swivel base is placed offset to a part of the traveling truck, the operation part (control lever, etc.) of the switching valve of the traveling motor provided on the traveling truck side can be rotated upward. It is also possible to provide it in a portion of the traveling vehicle where no platform is provided, and in that case, since the swivel platform is a finite swivel platform with a certain limit to the rotation angle,
It is also possible to avoid the swivel base from colliding with the operating section provided on the traveling truck side as the swivel turns, and the switching valve provided on the traveling truck side is configured to be operable from the traveling truck side. That's what I'm doing.

Next, an embodiment of the present invention will be described in detail based on the drawings. Fig. 1 shows a backhoe with blades as an example of a compound machine with a swivel base. A blade 4 that is moved up and down by a hydraulic cylinder 3 is provided at the front of a traveling trolley 2 that is configured to perform
A boom 6, an arm 7, a packet 8, and a work actuator 9 for bending and driving these are installed on the free end side of a limited rotating platform 5 whose rotation center is the front end side of the traveling trolley 2, and their operation. The swivel base 5 is pivotally mounted via a rotary joint 13, and an actuator 10 for rotating the swivel base 5 is also provided. A pressure oil supply device 17 consisting of a hydraulic pump 14, 15 and an operating oil tank 16 is mounted on a traveling truck 2 outside the range.

Fig. 2 shows a hydraulic circuit of a multi-machine with a swivel base configured as described above, and a hydraulic actuator 10°9 is mounted on the swivel base side.
Switching valves 18 and 19 for the traveling motors 1 and 1 are provided on the traveling bogie side, and one hydraulic pump 14 connects one traveling motor 1 to the swivel base 5 and The switching valves 18, 18, and 19 are connected in parallel to drive the packet 8, and the return oil path A is also used to drive the other travel motor 1, arm 7, and boom 6 by the other hydraulic pump 15. The switching valves 18, 18, and 19 are connected in parallel, and the pressure oil from the one hydraulic pump 14 is transferred to the one hydraulic motor 1, the swivel table 5, and the packet 8.
In order to use the pressure oil as pressure oil for operating the boom 6 and arm 7 when the actuator 10.9 is not operating, and to not operate the actuators 10.9 and the travel motors 1, 1. When operating oil tank 1 by reducing the load and draining oil
In order to return to 6, center bypass circuits B and B are assembled.

According to this hydraulic circuit, the rotary joint 13 interposed between the traveling carriage 2 and the swivel base 5 includes a hydraulic pump 1.
4.15, each switching valve 18..., 19.1
Pressure oil supply path C9C and one return oil path A connecting 9 in parallel
, and center bypass circuit B, oil path of B, 5 of D
Therefore, in a hydraulic circuit system using two hydraulic pumps 14, 15, two oil passages can be omitted compared to the conventional configuration.

In this case, the switching operation of each switching valve 19, 19 may be performed by electrical or mechanical remote control on the swivel base side.

In the figure, reference numeral 20.20 is a braking device for the traveling motor 1, and when the switching valve 19 is in the neutral position to stop the motor drive, the bullet 2 is
The braking unit 22 contacts and presses the disk 23 with the auxiliary force of 1, and pressurized oil is supplied to the ram cylinder 24 by operating the switching valve 19 that drives the motor 1 to resist the auxiliary force of the ammunition 21. In order to release the brake regardless of whether the motor 1 is supplied with pressure oil in the forward or reverse direction, both connecting pipes of the motor 1 are moved in different directions. The ram cylinder 24 is configured to be connected by an oil path via a shuttle valve 25, which communicates with the flow path, and to operate the ram cylinder 24 by a pressure oil path E from the shuttle valve 25.

This is to prevent cavitation from occurring in the motor connecting pipe system due to the inertial rotational force when the motor is stopped, and to ensure that the vehicle stops running.

26 is a hydraulic motor for supplying pressure oil to the hydraulic cylinder 3 for raising and lowering the blade, and a switching valve 27 is interposed in the piping system.

[Brief Description of the Drawings] The drawings show an embodiment of a multi-machine with a swivel base according to the present invention.
The figure is an overall side view of a backhoe with a blade as an example of a multifunction machine with a rotating stand, FIG. 2 is a hydraulic circuit diagram, and FIG. 3 is a hydraulic circuit diagram of a conventional configuration. 9.10...Hydraulic actuator for work, 13
...Rotary joint, 14.15...
・・Hydraulic pump, 18゜19・・・・Switching valve, C・
... Pressure oil supply oil path, 5 ... Limited swivel base,
2... Traveling trolley.

Claims (1)

[Scope of utility model registration request] A finite swivel base 5 is disposed on one side of a part of the traveling truck 2, and a switching valve 18 for work is installed on the finite swivel base 5 side.
- A working hydraulic actuator 10 whose operation is controlled by
9... and its switching valve 18... are provided, and the traveling motors 1, 1 and the hydraulic pump 14 whose operation is controlled by the traveling switching valve 19, 19 are provided on the traveling trolley 2 side. .15 and its switching valve 19.19, the hydraulic pump 14
．． 15, each of the switching valves 18..., 19.
19 are connected in parallel to constitute a pressure oil supply oil passage C9C, and the switching valve 18 for the operation of the pressure oil supply oil passage C9C is connected in parallel.
. . . and the traveling switching valve 19, 19 are connected to each other through a rotary joint 13.