| 摘要 |
PURPOSE:To operate a pressure feeding device effectively for long term by separating ready-mixed concrete supply path from discharge path in a pressure feed cylinder, and pressure contacting a valve made from resilient member with a valve seat section. CONSTITUTION:In a ready-mixed concrete pressure feeding device, a pressure feed pipe 3 is coupled to the tip of an outer pressure feed tube 2, and an inner pressure feed tube 4 is fitted slidably to the base end side. A valve 9 made from resilient member is fixed at the tip of a piston rod 8 while facing with a valve seat section 5. A cylinder 17 mounts relief valves on oil paths 19, 20 communicated respectively with pressure chambers at the opposite sides of a piston. The relief valve restricts mutual sliding of both tubes until the valve 9 completes stroke for the valve seat section 5 of the inner pressure feed tube 4. Consequently, pressure feeding device can be operated effectively over a long period.
|
