JPH0262954U - - Google Patents

Description

[Brief explanation of drawings]

Figures 1A and B are respectively a hydraulic circuit diagram and an electric circuit diagram of the detection means and solenoid valve of the present invention, Figure 2 is a side view of the hydraulic excavator of the embodiment of the present invention, and Figure 3 is a diagram of the hydraulic excavator of the embodiment of the present invention. The plan view, FIG. 4, shows the state immediately before the bucket of the work body enters the X-axis interference danger area. 10...Hydraulic excavator, 11...Main body, 12...
... Traveling body, 13 ... Swivel device, 14 ... Driver's cab,
15... Working body, 16... Lower boom, 17...
Atsupahboom, 18... Arm stay, 19...
Arm, 20...bucket, 21...lower boom cylinder, 22...offset cylinder, 23...
...Arm cylinder, 24...Bucket cylinder,
25...bucket link mechanism, 26...rod,
41, 42...Solenoid valve, 43...Offset remote control valve, 44...Offset control valve.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A lower boom is provided on the main body of a hydraulic excavator having an operator's cab on a swing device so as to be rotatable in the vertical direction with a lower boom cylinder, and an arm stay is attached to the tip of the lower boom via an atsupa boom. is provided so as to be rotatable in the horizontal direction, and the arm stay and the lower boom are connected by a parallel linking rod,
An offset cylinder for horizontally rotating the upper boom is installed between the lower boom and the upper boom, an arm is provided at the tip of the arm stay so that it can rotate vertically with an arm cylinder, and a bucket is attached to the tip of the arm. A hydraulic excavator having a working body rotatably provided in a vertical direction with a cylinder, and equipped with an offset remote control valve connected to the offset cylinder via an offset control valve, wherein the working body is connected to the X-axis and Detection means for detecting the entry into the danger area of interference with the operator's cab in the Y-axis direction are respectively provided, and the two offset control valves are provided upstream of the offset control valve and the offset remote control valve connected to the hydraulic pump. A device for preventing interference between a work body and a driver's cab in a hydraulic excavator, characterized in that it is provided with a solenoid valve that is activated by simultaneous detection signals from a detection means. (2) A detection means is provided for detecting that the work body enters into a dangerous area of interference with the operator's cab in the Y-axis direction due to the stroke of the offset cylinder, and the bucket cylinder, the lower boom cylinder, and the arm A detection means is provided for detecting that the work body enters a danger area of interference with the operator's cab in the X-axis direction due to the stroke of the cylinder, and the offset remote controller is connected to the offset control valve and the hydraulic pump. 2. The work body interference prevention device according to claim 1 in a hydraulic excavator, further comprising a solenoid valve operated by simultaneous detection signals from the two detection means upstream of the valve. (3) Due to the strokes of the lower boom cylinder, bucket cylinder, or arm cylinder, and the stroke of the offset cylinder, the lower boom, arm, upper boom, and bucket of the work body move toward the operator's cab in the X-axis direction and the Y-axis direction. 3. The apparatus for preventing interference with a working body in a driver's cab in a hydraulic excavator according to claim 2, further comprising a solenoid valve operated by a detection signal from a detection means for detecting entry into an interference danger area. (4) Due to the stroke of the offset cylinder and the stroke of the lower boom cylinder, bucket cylinder, or arm cylinder, two or three of the lower boom, arm, upper boom, and bucket of the work body move in the X-axis direction and the Y-axis direction. 3. The apparatus for preventing interference between a work body and the operator's cab in a hydraulic excavator according to claim 2, further comprising a solenoid valve that is activated by a detection signal from a detection means for detecting entry into an interference danger area with the operator's cab in the axial direction. (5) A claim in which the means for detecting the stroke of each cylinder is constituted by a magnetic sensor, a limit switch, or other rotation angle sensor at the base end of the bucket, arm, or lower boom that detects the rotation angle of the bucket, arm, or lower boom. A device for preventing interference with a working body in a driver's cab in a hydraulic excavator according to item 2, 3, or 4. (6) The solenoid valve consists of two solenoid valves, one of which is interposed in the circuit between the hydraulic pump and the offset remote control valve, and the other solenoid valve is connected between the offset remote control valve and the offset control valve. 2. A working body interference prevention device in a driver's cab in a hydraulic excavator according to claim 1, wherein the device is connected in parallel to the two detecting means provided in the circuit and connected in series to a power source.