Title:
【発明の名称】2シリンダ濃厚材料ポンプの制御方法及び装置
Document Type and Number:
Japanese Patent JPH04501897
Kind Code:
A
Abstract:
PCT No. PCT/EP89/00805 Sec. 371 Date May 28, 1991 Sec. 102(e) Date May 28, 1991 PCT Filed Jul. 11, 1989 PCT Pub. No. WO90/06444 PCT Pub. Date Jun. 14, 1990.A method and device for controlling a thick matter pump having two feed cylinders, each coupled to a material feed tank and including a drive piston for pumping thick matter through the respective feed cylinder. Each drive piston is driven within a respective drive cylinder coupled to a hydraulic reversing pump, which drives each drive piston through a compression stroke by pumping pressurized fluid to the respective drive cylinder. A hydraulically operable tube switch is alternately coupled to the feed cylinders to receive the thick matter being pumped, and is coupled to a delivery pipe to direct the flow of thick matter from each feed cylinder into the delivery pipe. Hydraulic tube-switch cylinders actuate the tube switch and are coupled between the reversing pump and the feed cylinders for receiving pressurized fluid flowing between the reversing pump and the drive cylinders to decouple the tube switch from one feed cylinder and couple the tube switch to the other. The tube-switch cylinders actuate the tube switch upon the drive piston of the respective feed cylinder reaching the end of its compression stroke. The direction of pressurized fluid flow from the reversing pump is maintained upon actuating the tube switch to maintain the respective drive piston at the end of its compression stroke.
Inventors:
Benkart hartmut
Application Number:
JP50773989A
Publication Date:
April 02, 1992
Filing Date:
July 11, 1989
Export Citation:
Assignee:
Putzmeister Werk Maschinenfabrik Gesellschaft Mitt Beschlenktel Haftung
International Classes:
F04B7/02; F04B9/117; (IPC1-7): F04B7/02
Attorney, Agent or Firm:
Takehisa Ito