JPH0224277A - Device for supporting cab of construction machine - Google Patents

Abstract

PURPOSE:To improve the safety of an operation in the captioned device in which a cab is supported by an upper turning body via a plurality of buffering supporting bodies by automatically supporting the cab in a fixed condition when the traveling speed of a construction machine becomes below a set speed. CONSTITUTION:In a construction machine like a wheel type shovel, etc., in which an upper turning body 11 having the cab 13 of an operating chamber 12 is rotatably provided on the upper portion of a lower traveling body 10 having wheels, buffering supporting bodies 9 are provided in a plurality of places of the installing position of the operating chamber 12 on the upper turning body 11, and the cab 13 is supported via these buffering supporting bodies 9. In this case, a lock cylinder 15 is provided between the lower portion of the cab 13 and an upper turning-body frame 14. When a vehicle traveling speed detected by a traveling speed detector 19 is below a set speed according to a set speed commander 21, the lock cylinder 15 is operated by exciting a solenoid valve 17 to support the cab 13 in a fixed condition.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a cab support device for a driver's cab for construction machinery.

BACKGROUND ART FIG. 3 is a side view of a wheeled excavator, in which 1 is a lower traveling body, 2 is an upper rotating body, 3 is a driver's cab on the upper rotating body 2, 4 is a cab for the driver's cab 3, Reference numeral 5 denotes a work attachment attached to the front part of the upper revolving structure 2.

Figure 4 is a sectional view of the main part near the driver's cab 3 in Figure 3.
In the figure, 6 is a cab floorboard, 7 is a driver's cab, 8 is a frame for an upper rotating body, and 9 is a buffer support using a rubber member, a spring member, etc.

Next, the configuration of a conventional cab support device will be described with reference to FIG. Buffer supports 9 are arranged at a plurality of locations on the upper revolving body at which the driver's cab 3 is attached, and the cab 4 is attached to the frame 8 of the upper revolving body via the plurality of buffer supports 9.

Problems to be Solved by the Invention In a wheeled excavator, a support body is provided between the cab for the operator's cabin and the frame for the upper revolving body. This buffer support is provided mainly to improve riding comfort for the driver when the excavator is running. For this reason, when a wheeled excavator is traveling at normal speeds on a regular road, there are not many problems. However, excavators run on uneven ground, or run at low speeds or stop for work.The excavator's work attachment is attached to the front part of the upper revolving structure, so it is difficult to use the work attachment. When performing excavation work, etc., the cab sways, and the driver himself also sways, making it difficult to perform excavation work.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a cab support device that can automatically support a cab in a fixed state when the traveling speed of a construction machine becomes lower than a set speed.

Means for solving the problem A. A lock cylinder is interposed between the lower part of the cab and the frame for the upper revolving body, and one chamber of the lock cylinder and the pump are connected via a solenoid valve. , A traveling speed detector for detecting the traveling speed of the construction machine is provided on the lower traveling body, and the traveling speed signal can be inputted to the controller; c. Furthermore, a set speed command device is provided in the controller, and the traveling speed of the construction machine is adjusted. A signal outputted from the controller when the speed is less than the set speed commanded by the set speed command device is configured to be able to act on the solenoid of the solenoid valve.

Operation A. When the construction machine is running, if its running speed is higher than the set speed commanded by the set speed command device, no signal is output from the controller to the solenoid of the solenoid valve. Since the solenoid valve is in the tank communication oil path position, the lock cylinder is unlocked and the cab is supported in a floating state. Since the cab has a sufficient buffering effect, the driver's ride comfort is good when driving on a number of roads.

First, when the running speed of the construction machine is less than the set speed commanded by the set speed command device (including when the machine stops running), a signal is output from the controller to the solenoid of the electromagnetic valve. The solenoid of the solenoid valve is energized, and the solenoid valve is switched to the pressure oil communication oil path position. At this point, pump pressure acts on the rod side oil chamber of the lock cylinder, and the cab is automatically fixed to the upper revolving body frame. This allows the driver to stably operate the work attachment and perform work.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram of a cab support device according to the present invention. In FIG. 6, 10 is a lower traveling structure, 11 is an upper revolving structure, 12 is a driver's cab attached to the upper revolving structure 11, and 13 is a driver's cab 12. The cab 14 is a frame for the upper rotating body 11,
9 is a buffer support, 15 is a lock cylinder, 16 is a pump, 17 is a solenoid valve, 18 is a solenoid for the solenoid valve 17, 1
9 is a running speed detector, 20 is a controller, 21 is a set speed command, 22 is an automatic/manual selection switch, 23 is a relief valve, and 24 is a tank. Note that manually operated components related to the automatic/manual selection switch 22 are not illustrated or described. FIG. 2 is a detailed sectional view of the vicinity of the driver's cab 12 in FIG. 1.

Next, the configuration of the cab support device according to the present invention will be described with reference to FIGS. 1 and 2. A lock cylinder 15 is interposed between the lower part of the cab 13 and the frame 14 for the upper revolving body 11, and the rod side oil chamber I of the lock cylinder 15 and the pump 23 are connected via a solenoid valve 17. on the other hand,
A traveling speed detector 19 for detecting the traveling speed of the construction machine is provided on the undercarriage body 10, and the traveling speed signal is set to be inputtable to the controller 20. Further, the controller 20 is provided with a set speed command 21, and when the traveling speed of the construction machine is less than the set speed commanded by the set speed command 21, a signal output from the controller 20 is sent to the solenoid valve 17. It was configured so that it could act on the solenoid 18. Note that the travel speed desired by the driver can be set in the set speed command device 21.

Next, the functions of the cab support device according to the present invention will be described. When the construction machine is running, if the running speed is equal to or higher than the set speed commanded by the set speed command device 21, no signal is output from the controller 20 to the solenoid 18 of the solenoid valve 17. 18 is de-energized, so the solenoid valve 17 is located at the tank communication oil path position opening. The lock cylinder 15 is unlocked and the cab 13 is supported in a floating state. Since the cab 13 has a sufficient buffering effect,
-The driver's ride comfort when driving on a numerical road is good0
Next, when the running speed of the construction machine is equal to or lower than the set speed of the set speed command device 21 (including when the machine stops running), the speed signal from the set speed command device 21 is input to the controller 20. The signal output from the controller 20 then acts on the solenoid 18 of the electromagnetic valve 17. The solenoid 18 is energized and the solenoid valve 17 is switched from the tank communication oil passage position opening to the pressure oil communication oil passage position C. The discharge pressure from the pump 16 is
It acts on the oil passages 25 and 26 and the rod side oil chamber a of the solenoid valve 17. Therefore, the lock cylinder 15 is contracted, and the cab 1
3 is in a fixed state. This allows the driver to stably operate the work attachment and perform work.

In addition, the automatic 0 manual selection switch 2 can be set at any time according to the driver's request.
2 to manual operation, the solenoid valve 17 is switched and operated regardless of the running speed of the construction machine, and the lock cylinder 15 can be locked. Further, in the circuit of the cab support device, pneumatic pressure may be used instead of hydraulic pressure.

Effects of the Invention The buffer support provided between the driver's cabin cab of the construction machine and the upper revolving body frame is designed primarily to improve riding comfort for the driver when the construction machine is running. For this reason, there is not much of a problem when construction machinery is traveling at normal speeds on flat ground, but construction machinery may be traveling on uneven ground, or traveling at low speeds or stopping for work. The work attachment of construction machinery is attached to the front part of the upper revolving structure, so
When performing excavation work using work attachments, the cab swings, and the driver itself also swings.
However, in the cab support device according to the present invention, a lock cylinder is interposed between the lower part of the cab and the frame for the upper revolving body, and a chamber of the lock cylinder and the pump are connected by a solenoid valve. concatenated via, while
A travel speed detector is installed on the undercarriage to detect the travel speed of the construction machine, and the travel speed signal can be input to the controller. Furthermore, it was set so that it could be input to the above controller. Furthermore, the controller is provided with a set speed command device, and when the traveling speed of the construction machine is below the set speed, the signal output from the controller is configured to be able to act on the solenoid of the electromagnetic valve. Thereby,
When the construction machine travels on level ground at a speed higher than the set speed, the cab is supported in a floating state, providing a comfortable ride for the driver. ), the lock cylinder is retracted and the cab is automatically fixed to the upper revolving structure. Therefore, the driver can operate the work attachment in a stable manner and perform the work.

Therefore, the construction machine equipped with the cab support device according to the present invention maintains a comfortable ride when traveling at a speed higher than the set speed set by the driver, and also maintains a comfortable ride when traveling at a speed lower than the set speed or when stopped. Improve driving comfort and work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of the cab support device according to the present invention, Fig. 2 is a detailed sectional view of the vicinity of the operator's cab in Fig. 1, Fig. 3 is a side view of the wheeled excavator, and Fig. 4 is a diagram of the conventional cab. FIG. 1, 10 2.11 3, 12 4, 13 8, 14 9.9゜Lower traveling body Upper revolving body Operator's cab Cab frame Buffer support Lock Cylinder pump Solenoid valve Solenoid Traveling speed detector Controller Setting speed command or higher

Claims (1)

[Claims] In a cab for construction machinery that is attached to the frame of the upper revolving body, buffer supports are arranged at multiple locations on the upper revolving body at multiple locations for the operator's cab equipment, and the cab is attached to the frame of the upper revolving body via the multiple buffer supports. A lock cylinder is interposed between the body frame and a chamber of the lock cylinder and the pump are connected via a solenoid valve, and a traveling speed detector is provided on the lower traveling body to detect the traveling speed of the construction machine. is provided, the traveling speed signal can be input to the controller, and furthermore, a set speed command device is provided in the controller, and when the traveling speed of the construction machine is less than the set speed commanded by the set speed command device, the traveling speed signal can be inputted to the controller. A cab support device for construction machinery, characterized in that the output signal is configured to be able to act on a solenoid of the electromagnetic valve.