Multistage telescoping mechanism sequence control device and engineering equipment applying same

Abstract

The invention provides a multistage telescoping mechanism sequence control device and engineering equipment. The invention relates to the field of hydraulic control. The multistage telescoping mechanism sequence control device in the invention comprises a first operating device used for conveying a hydraulic fluid to a corresponding downstream component as well as a first hydraulic cylinder and asecond hydraulic cylinder which are arranged at the downstream of the first operating device and are connected with the first operating device, wherein the first hydraulic cylinder and the second hydraulic cylinder are respectively connected with two telescopic construction members of the multistage telescoping mechanism and are respectively used for driving the two telescopic construction members. The rodless cavity of the first hydraulic cylinder is communicated with a first port of the first operating device, and the rod cavity of the first hydraulic cylinder is communicated with a second port of the first operating device; the rodless cavity of the first hydraulic cylinder and the rodless cavity of the second hydraulic cylinder are communicated and the rod cavity of the first hydraulic cylinder and the rod cavity of the second hydraulic cylinder are communicated; and the cross sectional area of the rod cavity of the first hydraulic cylinder is smaller than that of the rod cavity of the second hydraulic cylinder. By applying the multistage telescoping mechanism sequence control way in the invention, sequential driving of a multistage telescoping mechanism can be realized, and the structure is simple.

Description

technical field [0001] The invention relates to the field of hydraulic control, in particular to a sequence control device of a multi-stage telescopic mechanism and engineering equipment including the device. Background technique [0002] Telescopic mechanisms are often used in engineering equipment in the field of operation and transportation, such as telescopic support legs of concrete pump trucks and truck cranes. Taking the concrete pump truck as an example, with the development of the pump truck, the length of the boom of the concrete pump truck continues to increase. In order to ensure the stability of the whole truck, it is necessary to expand the area of ​​the stable support area of ​​the whole truck, which leads to the continuous span of the supporting legs. increase. However, due to the limited vehicle width requirements, the telescopic mechanism with only a single-stage telescopic outrigger can no longer meet the requirements, and it is necessary to use two-stage...

AI Technical Summary

Problems solved by technology

[0009] Option 1, the length of the telescopic outriggers is limited, which cannot meet the support strength requirements of some models, and obviously cannot guarantee the sequential driving of multi-stage telescopic outriggers;

[0010] Scheme 2, when used for the drive of two-stage telescopic outriggers, if the hydraulic pipelines are connected in parallel, and each hydraulic cylinder drives one of the first-stage telescopic outriggers, then each operating device corresponds to the driving operation of one outrigger. In this case, the expansion and contraction of the outriggers at all levels can be artificially controlled to achieve sequential control, but the oil pipes need to be connected to the two hydraulic cylinders separately. The space is small and there are many hydraulic pipelines. The oil pipes reciprocate together with the telescopic outriggers, which is easy to use. The oil pipe is damaged due to friction between the oil pipe and the telescopic outrigger, and the layout of the hydraulic pipeline is quite difficult. If two hydraulic cylinders are connected in series, the hydraulic pipeline is reduced, but the sequence control of the telescopic outrigger cannot be realized; The drive of telescopic outriggers at the level and above obviously cannot guarantee sequence control;

[0011] Solution 3: Carry out multi-layer hollowing out of the inside of the piston rod, so that the piston rod can not only be the piston rod of the upper level hydraulic cylinder, but also the cylinder barrel of the lower level hydraulic cylinder, resulting in excessively large outer diameter of the hydraulic cylinder, complicated structure, and difficult The cost is high, and limited by the structural size requirements of the telescopic outriggers, the hydraulic cylinder bore is limited, resulting in insufficient driving force, and the telescopic outriggers are prone to jamming;

[0012] Scheme 4, when used for driving two-stage telescopic outriggers, the hydraulic cylinder and chain drive one of the first-stage telescopic outriggers respectively, and the hydraulic cylinder and the motor driving the chain are controlled separately, then each operating device corresponds to the drive of one outrigger In this case, the expansion and contraction of the outriggers at all levels can be artificially controlled to achieve sequential control, and the hydraulic pipe layout is relatively simple; when it is used for the drive of three-level and above telescopic outriggers, it is obviously impossible to guarantee the sequential control

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