A New Type of Conveying Cylinder Piston Limiting Mechanism

Abstract

The invention relates to a novel piston limiting mechanism of a conveying cylinder. The novel piston limiting mechanism comprises a conveying cylinder, a piston head, a washing chamber, a main oil cylinder, a piston rod, a piston 1, clamping keys and a piston 2, wherein the washing chamber is connected between the conveying cylinder and the main oil cylinder, the piston rod is arranged in the main oil cylinder, both ends of the piston rod are respectively provided with the piston head and the piston 1, and the piston head moves between the conveying cylinder and the washing chamber. The novel piston limiting mechanism is characterized in that the diameter of one section of the bottom end of the main oil cylinder is larger in design, the piston 2 is arranged on the section of the bottom end of the main oil cylinder, the diameter of the piston 2 is larger than the diameter of the piston 1, the piston 1 is fixedly arranged on the piston rod by the clamping keys, and the bottom of the main oil cylinder is provided with a hydraulic fluid port. The novel piston limiting mechanism has the advantages that through a diameter-varying structure at the bottom end of the main oil cylinder, on the premise of the main oil cylinders with the same in the length, the one-time pumping amount of the main oil cylinder is increased; the structure is simple, the overhauling and maintenance are easy, and the price-performance ratio of a pump truck is improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a novel delivery cylinder piston limiting mechanism. Background technique [0002] Concrete pump truck is a high-efficiency concrete conveying engineering machinery that integrates concrete pumping mechanism, distribution boom and support mechanism on the chassis of the car, integrating driving and pumping. The concrete is pumped to the required position under the action of the delivery cylinder piston. During normal pumping operation, the piston head is prohibited from entering the washing chamber to prevent slurry leakage. After the pumping is completed, the entire conveying pipe and the piston head need to be cleaned in time. At this time, the piston head needs to be returned to the washing chamber for cleaning. [0003] At this time, there are generally two solutions: [0004] 1. Install a baffle inside the washing room to prevent the piston head from entering. But ev...

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Problems solved by technology

[0007] The present invention aims at the problem that the reserved space at the bottom of the main oil cylinder is too large in the prior art, and provides a new type of delivery cylinder piston limit mechanism. The axial length of the supporting piston is greatly shortened to obtain more space

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