Flexible control loop of hydraulic cylinder and engineering mechanical equipment

Abstract

The invention relates to a flexible control loop of a hydraulic cylinder. The flexible control loop of the hydraulic cylinder comprises an oil inlet path (13), an oil return path (14), a first working oil path (15), a second working oil path (16) and a main oil path steering valve (1) for realizing flexible control over the hydraulic cylinder (4), wherein the first working oil path (15) and the second working oil path (16) are respectively connected to a rod cavity and a rodless cavity of the hydraulic cylinder (4); and a switching valve for controlling the first working path (15) to open and close is connected to the first working oil path (15). Besides, the invention also provides engineering mechanical equipment provided with the flexible control loop of the hydraulic cylinder. According to the flexible control loop of hydraulic cylinder and the engineering mechanical equipment disclosed by the invention, by arranging the switching valve on the first control oil path, the first control oil path is controlled to open and close as required, a stroke locking function for preventing a stretching member of the hydraulic cylinder from continuously extending due to accidental means is effectively realized, and therefore working reliability of the hydraulic cylinder is ensured.

Description

technical field [0001] The invention relates to a hydraulic control system of a hydraulic cylinder, in particular to a telescopic control circuit of a hydraulic cylinder. In addition, the present invention also relates to a construction machinery equipment provided with the telescoping control circuit of the hydraulic cylinder. Background technique [0002] Hydraulic telescopic mechanisms on construction machinery and other mechanical equipment mostly use hydraulic cylinders as telescopic drive devices. [0003] For example, as far as hydraulic cranes are concerned, especially large-tonnage or super-large-tonnage cranes are mostly single-cylinder multi-section boom telescopic structures, in which oil is supplied to the hydraulic cylinder through the main oil circuit reversing valve in the telescopic control circuit of the hydraulic cylinder to control Its telescopic movement, the extension length of the hydraulic cylinder can be measured by the displacement sensor. Usually...

AI Technical Summary

Problems solved by technology

When the central oil channel forms a pressure oil supply, the pressure acting on the area of ​​the core tube 5 causes the cylinder to protrude slightly, resulting in a change in the length of the hydraulic cylinder, which causes the pin holes that have been aligned when the cylinder pin and arm pin protrude Invalid position, unable to plug

[0006] Specifically, the current hydraulic expansion mechanism has the following disadvantages when the bolt mechanism is in action: when the bolt mechanism is in motion, assuming that the pressure of the hydraulic oil in the central channel is P, and the outer diameter of the core tube of the central channel is d, the core tube and the The force on its end face is: F=(π×d 2 ×P) / 4, it can be seen that F is proportional to the pressure P and the outer diameter of the core tube d

When the hydraulic cylinder is actually stretching, when the hydraulic cylinder stretches to the predetermined position (the cylinder pin or arm pin has been aligned with the pin hole), and when the cylinder pin or arm pin is ready to be extended, the force F will push the cylinder to extend at the same time. Therefore, the pin hole position where the cylinder pin and the arm pin are aligned fails, and the pin cannot be inserted

The current telescopic system often has the above-mentioned failures when the latch mechanism operates, resulting in reduced system reliability

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