Loading and unloading switching device and oil supply system and engineering machinery applying same
A switching device and oil port technology, which is applied in mechanical equipment, fluid pressure actuators, servo motors, etc., can solve the problems of not being able to meet the requirements of high-meter climbing vehicles and control quality constraints, so as to facilitate maintenance operations and reduce External contact, the effect of meeting the needs of pipe layout
Active Publication Date: 2014-09-17
XCMG FIRE FIGHTING SAFETY EQUIP CO LTD
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Problems solved by technology
However, with the increase of the operating height of the fire truck on the climbing platform, the control function and quality requirements of the hydraulic system are also getting higher and higher. However, the existing oil supply system for getting on and off the car can only output a fixed displacement during the working process, and cannot real-time Adjust the output of the pump according to the load pressure
Obviously, the existing simple hydraulic control system can no longer meet the requirements of high-meter climbing vehicles, and the improvement of control quality is restricted
Method used
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[0031] The core of the present invention is to provide a switching device for getting on and off the car, which is integrated with the first reversing valve for controlling the interlocking of getting on and off the car and the second reversing valve for controlling and realizing load feedback adjustment. On the basis of realizing the interlock function of getting on and off the car, it provides a reliable guarantee for effectively improving the control accuracy of the system. A detailed description will be given below in conjunction with the accompanying drawings of the description.
[0032] See figure 2 , which shows a schematic diagram of the working principle of the boarding and disembarking switching device described in the first embodiment.
[0033] The integrated valve body of the getting on and off switching device is integrated with two first reversing valves for controlling the interlocking of getting on and off, namely the first reversing valve 21 and the first re...
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The invention discloses a loading and unloading switching device, which comprises a switching pressure oil line, an oil return oil line, a first change valve communicated with a loading interface or an unloading interface, an integrated valve body and a second change valve, wherein the integrated valve body, the first change valve and the second change valve are integrated, and the outer surface of the integrated valve body is provided with a pressure oil port, an oil return oil port, the loading interface, the unloading interface and a negative feedback balance oil port; and the second change valve is arranged between the negative feedback balance oil port and the pressure oil port as well as the oil return oil port so as to switch the negative feedback balance oil port to be conducted with the pressure oil port or the oil return oil port. The loading and unloading switching device is conductive to improving the switching control precision of a loading and unloading system of engineering machinery and provides a reliable guarantee for adjusting the pressure and the flow of a working medium. On the basis, the invention also provides an oil supply system and engineering machinery applying the loading and unloading switching device.
Description
technical field [0001] The invention relates to construction machinery technology, in particular to a switching device for getting on and off a vehicle, an oil supply system and construction machinery using the device. Background technique [0002] In terms of function, the existing self-propelled hydraulic control construction machinery is composed of two parts: getting on the car and getting off the car, which are connected by components such as slewing bearings and central rotating bodies. Among them, the operating actuators of various types of machinery are installed on the upper vehicle to complete the corresponding functional actions according to the manipulation instructions. [0003] Taking the fire truck on the climbing platform as an example, the main actions of the vehicle on the vehicle include the rotation of the turntable, the expansion and contraction of the boom, the luffing of the crank arm, the leveling of the platform, and the fire fighting, etc. At the sa...
Claims
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IPC IPC(8): F15B11/17F15B13/02
Inventor 史先信徐小东孔德美朱凤
Owner XCMG FIRE FIGHTING SAFETY EQUIP CO LTD