Double-cylinder pumping device and concrete pump truck

Abstract

The invention discloses a double-cylinder pumping device, and further provides a concrete pump truck. Lubricating openings are formed in one sides, close to main hydraulic cylinders, of conveying cylinders respectively, first rear buffering openings and second rear buffering openings are formed in one sides, away from the conveying cylinders, of main hydraulic cylinder barrels of the main hydraulic cylinders respectively at intervals in the length direction and are connected through rear buffering pipes; according to the relative position of the first rear buffering openings and the second rear buffering openings, when the head portions of pistons of the main hydraulic cylinders are located between the first rear buffering openings and the second rear buffering openings, the head portions of concrete pistons correspond to the lubricating openings. According to the technical scheme, when moving to regions of the first rear buffering openings and the second rear buffering openings, the concrete pistons can be buffered and correspond to the lubricating openings at the moment, and can be more accurately lubricated by lubricating oil, abrasions caused by insufficient lubrication of the concrete pistons is reduced, the reliability of the pumping device is improved, and the service life of the pumping device is prolonged.

Description

technical field [0001] The invention relates to engineering machinery, in particular to a double-cylinder pumping device and a concrete pump truck. Background technique [0002] At present, pumping devices are usually used to pump materials in the engineering field. The double-cylinder pumping device is a more commonly used pumping device. [0003] Usually, the double-cylinder pumping device includes two conveying cylinders (ie, concrete cylinders) and a main oil cylinder. The main oil cylinder pistons of the two main oil cylinders are respectively connected with the concrete pistons of the corresponding conveying cylinders. The two concrete pistons are correspondingly driven to reciprocate respectively. The two master oil cylinders can be set to communicate with rod chambers or rodless chambers, and the non-communicating side of the two master oil cylinders is connected with the oil pump to supply oil to the master oil cylinders, so that the direction of motion of the pis...

AI Technical Summary

Problems solved by technology

[0007] However, due to the low precision of the hydraulic system, it is difficult to accurately control the flow rate, so it is impossible to ensure that the concrete piston just stops at the position opposite to the lubricating port when the lubricating port outputs grease.

If the pumping speed is fast, the concrete piston may slip through the lubrication port and not be lubricated; if the pumping speed is slow, the concrete piston may not run past the lubrication port and cannot be lubricated

Images