concrete pump truck Piston seal
Pump car principle and piston function description
Concrete pump truck is a machine that uses pressure to transport concrete continuously along the pipeline, which is composed of pump body and conveying pipe; The power of the concrete pump truck transmits the power of the engine to the hydraulic pump group or the rear axle through the power transfer box, and the hydraulic pump pushes the piston to drive the mixing Condensate pump work. Then the concrete is transported to a certain height and distance using the fabric rod and conveying pipe on the pump truck. When the hydraulic system pressure oil enters one master cylinder, the piston rod is extended, and the other piston rod is retracted through the pressure oil of the sealing circuit connecting pipe. The concrete conveying piston connected with the piston rod of the main cylinder has a self-priming effect in the conveying cylinder when it retracted, and the concrete in the hopper is sucked into the conveying cylinder through the slide valve inlet under the action of atmospheric pressure and the boost of the mixing blade. At the same time, under the action of oil pressure, the other main cylinder pushes the piston rod of the main cylinder to extend and at the same time pushes the concrete piston to press out the concrete in the conveying cylinder, and enters the concrete conveying pipe through the Y-tube of the slide valve conveying port. After the action is completed, the system automatically reverses the pressure oil into another main cylinder to complete the suction and delivery stroke of another different conveying cylinder. So repeated, the concrete in the hopper is continuously sucked and pressed out of the conveying cylinder, through the Y-shaped pipe and the pipe connecting the outlet to the operation point, to complete the pumping operation.
Common piston head structure
Rubber fabric concrete piston seal system is made of special rubber and fabric fiber composite, its outer layer is woven material fiber, can provide excellent wear resistance; The body is a special rubber with high rebound and high heat resistance to ensure that the lip part has a lasting contact stress; The bottom is a cloth layer to ensure that the product has sufficient modulus and stiffness, and does not deform during installation and use.
Material performance index
| Item |
Shore A° |
Compressed permanent deformation(%) |
Tensile strength(Mpa) |
Breaking elongation(%) |
Tear strength(KN/m) |
Hot air aging 100ºC×70 h |
| Requirement |
85±3 |
≤20% |
≥18 |
≥270 |
≥50 |
Hardness change (Max)/(degree) : +10
Tensile strength change rate (Max.)
/ % : -20
Change rate of elongation at break (maximum)
/ % : -50 |
| Standard |
GB/T6031-1998 |
GB/T 7759-1996 |
GB/T 528-2009 |
GB/T 528-2009 |
GB/T 529-2008 |
Product life index
Non-ultra-high pressure products (pumping pressure ≤22MPa) pump C20~C60 grade commercial concrete,
Minimum service life ≥300 hours
Special concrete piston for ultra-high pressure (pumping pressure ≤40MPa)
Minimum service life ≥200 hours.
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