Piston pump for pumping slurry shaped materials, in particular concrete, and concrete pump

Abstract

The invention provides a piston pump for pumping slurry shaped materials, in particular concrete. The piston pump comprises at least one transfer cylinder; a concrete piston capable of moving in the axial direction is arranged in the transfer cylinder, wherein a radial annular clearance is left between the transfer cylinder and the concrete piston in advance; a second end face of the concrete piston is connected with a driving mechanism by a piston rod. One elastic annular element is arranged on each of two end faces of the concrete piston; the annular elements are communicated with the annular clearance, and are bonded on the inner surface of the transfer cylinder. In order to reduce the wearing between the transfer cylinder and the concrete piston during the pumping process of the high pressure pump, an oil scraping ring is arranged on a first end face of the concrete piston, a pressure seal is arranged on the second end face of the concrete piston, the oil scraping ring and the pressure seal synchronously limit the annular clearance in the axial direction so as to form an annular cavity capable of containing the fluid. A certain amount of fluid is always injected in the annular cavity, and the fluid is pumped by the instant pressure of material pumping process at the side of the first end face of the concrete piston.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a piston pump and a concrete pump for pumping mud-like materials, especially concrete. Background technique [0002] Piston pumps are used to pump industrial muddy substances, such as concrete. Normally, piston pumps have two delivery cylinders; during the suction stroke, the delivery cylinders are connected to the hopper and can suck material from the hopper; during the pumping stroke, The delivery cylinder can communicate with the distribution pipe through the distribution valve. The concrete piston of the conveying cylinder is connected with the piston of the main oil cylinder through a common piston rod, and is driven by the main oil cylinder to realize reciprocating motion. Since the concrete piston is in direct contact with the material, strict requirements are put forward on the sealing of the concrete piston and the inner surface of the conveying cylinder, and minimu...

AI Technical Summary

Problems solved by technology

However, this is not effective at high pressures, since the penetrating abrasive material wears out the conveying cylinders; at the same time, it places higher demands on the drive capacity

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