Double-cylinder pumping device hydraulic oil replacement control method, double-cylinder pumping device and equipment

Abstract

The invention provides a double-cylinder pumping device hydraulic oil displacement control method, and further provides a double-cylinder pumping device and pumping equipment. According to the double-cylinder pumping device hydraulic oil displacement control method, from the moment a piston of a first main hydraulic cylinder or a piston of a second main hydraulic cylinder moves and reaches a predetermined position, a cavity with a rod and a cavity without a rod of the first main hydraulic cylinder and a cavity with a rod and a cavity without a rod of the second main hydraulic cylinder are respectively communicated for a first lasting time t1; from the predetermined position, each cavity with a rod and a corresponding cavity without a rod are divided for a second lasting time t3, and therefore hydraulic oil inside communicated cavities is displaced during the time interval which is the difference of the second lasting time t3 and the first lasting time t1. When oil displacement operations are conducted according to an oil displacement mode in the stretching and drawing process of the first main hydraulic cylinder and the stretching and drawing process of the second main hydraulic cylinder, the temperature of the hydraulic oil in the communicated cavities is detected, the first lasting time t1 and / or the second lasting time t3 is adjusted to change the span of the time interval, and therefore requirements for temperatures of working conditions are met. Oil displacement operations in the communicated cavities of the double-cylinder pumping device can be controlled in a relatively optimized mode through the double-cylinder pumping device hydraulic oil displacement control method, the double-cylinder pumping device and the equipment, and therefore the energy saving effect is achieved.

Description

technical field [0001] The invention relates to a hydraulic oil temperature control method for a double-cylinder pumping device, in particular to a hydraulic oil replacement control method for a double-cylinder pumping device. Further, the present invention relates to a double-cylinder pumping device capable of realizing the above hydraulic oil replacement control method. In addition, the present invention also relates to a pumping equipment including the double-cylinder pumping device, such as a concrete pump truck and the like. Background technique [0002] Concrete, mud and other viscous materials are commonly used construction materials in the field of engineering construction. These viscous materials are typically pumped through a double-cylinder pumping device. As far as the double-cylinder pumping device is concerned, its main structure can refer to the concrete double-cylinder pumping device widely used in engineering construction. This double-cylinder pumping devic...

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Problems solved by technology

In addition, there is no other measure in the prior art to control the temperature of the hydraulic oil in the communication chamber of the double-cylinder pumping device

[0007] However, obviously, there are obvious shortcomings in this technical measure of exchanging the oil in the communication chamber through the bypass oil passage of the U-shaped pipe type. During the delivery cycle, the oil in the communication cavity is exchanged in a fixed state, regardless of the temperature of the oil in the communication cavity. When the temperature of the oil in the communication cavity is low, the oil exchange will be wasteful. The flow of hydraulic oil in the hydraulic system increases the workload of the hydraulic pump and causes unnecessary waste of energy

[0008] Also, see figure 1 As shown, in this prior art, the oil in the communication cavity is exchanged through the bypass oil passage of the U-shaped pipe type, and two U-shaped pipes of the first and second master cylinders 2 and 9 need to be installed on the respective cylinder bodies. For this purpose, it is necessary to drill four holes on each cylinder block as the ports of the corresponding bypass oil circuit, wherein one of the ports at both ends of each bypass oil circuit is within the movement stroke of the piston, This makes the seal on the piston in the cylinder pressurized through the hole, the wear of the seal is aggravated, which seriously reduces the service life of the cylinder

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