Boom extending and retracting apparatus of a crane
By introducing the function of automatically switching fluid circuits into the crane boom telescopic device, and using the operating lever and detection components to automatically select the appropriate fluid circuit, the problem of complex operations in the existing technology is solved, and the convenience and efficiency of the boom are improved. .
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no. 1 approach
[0041] figure 1 It is a schematic side view of the mobile crane 1 using the boom telescopic device according to the first embodiment of the present invention.
[0042] Such as figure 1 As shown, the mobile crane 1 includes a vehicle 2 and a lifting device 3.
[0043] The vehicle 2 has wheels 6 and runs with an engine (not shown) as a power source. The vehicle 2 further has legs 7 that can be extended to both sides of the vehicle 2 in the left-right direction. The leg 7 has a hydraulic lifting cylinder, and the leg 7 can touch the ground by extending the lifting cylinder downward. By extending the legs 7 to both sides in the left-right direction and grounding, the vehicle 2 can be stabilized and the working range of the crane can be expanded.
[0044] The lifting device 3 has a turntable 11 with figure 2 The telescopic boom 13 of the telescopic cylinder 12 shown in, image 3 The hydraulic circuit and hydraulic control system 15 shown in FIG. 1, and the working room 16 for the worke...
no. 2 approach
[0170] Next, the boom telescopic device according to the second embodiment of the present invention will be described.
[0171] The basic structure and operation of the mobile crane 1 and the boom telescopic device are the same as the structure and operation in the first embodiment, and the same components are assigned the same reference numerals and descriptions thereof are omitted. Hereinafter, the description will mainly focus on the differences from the first embodiment.
[0172] Figure 7 It is a schematic diagram for explaining the hydraulic circuit 14 and the hydraulic control system 15 of the boom telescopic device according to the second embodiment of the present invention. The hydraulic circuit 14 is the same as that of the first embodiment.
[0173] The operation unit 91 of the hydraulic control system 15 has a differential switch 111 for setting the use of the differential hydraulic circuit. With the differential switch 111, it is possible to set a mode using a differen...
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