Hydraulic cylinder assembly for a machine for producing a fiber web, especially a paper or cardboard making machine

A fiber web, hydraulic cylinder technology, applied in mechanical equipment, fluid pressure actuation devices, servo motors, etc., can solve problems such as hydraulic oil leakage, achieve reliable piston position detection, and reduce energy costs.

Inactive Publication Date: 2012-05-09
VALMET TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The movability of the control piston in the valve housing imposes a certain clearance or gap between the control piston and the valve housing, thus making hydraulic oil leakage within the control valve unavoidable

Method used

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  • Hydraulic cylinder assembly for a machine for producing a fiber web, especially a paper or cardboard making machine
  • Hydraulic cylinder assembly for a machine for producing a fiber web, especially a paper or cardboard making machine
  • Hydraulic cylinder assembly for a machine for producing a fiber web, especially a paper or cardboard making machine

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Embodiment Construction

[0048] In the following description of the figures, identical or functionally identical elements are designated with the same reference numerals so that a general functional description and reference can be made based on one figure. Furthermore, if in the following reference is made to a pressure regulator or a flow regulator, if nothing else, it is a digital hydraulic pressure regulator or flow regulator, which works according to the digital hydraulic principles used in the previous description.

[0049] exist figure 1 Schematically shows a part of the structure of the hydraulic cylinder assembly 1 according to the first embodiment of the present invention.

[0050] The hydraulic cylinder assembly 1 has a hydraulic cylinder 2 and four digital hydraulic pressure regulators 3 . The hydraulic cylinder 2 is a hydraulic differential cylinder which has a cylinder housing 21 and a piston 27 which is movable in the cylinder housing. The cylinder housing 21 is divided into a cylinde...

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PUM

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Abstract

The invention relates to a hydraulic cylinder assembly for a machine for producing a fiber web, especially a paper or cardboard making machine. The assembly comprises a hydraulic cylinder (2) having a cylinder housing (21) and a piston (27) which can be displaced inside the cylinder housing, said piston subdividing the cylinder housing into a chamber (22) on the cylinder head side and a chamber (23) on the cylinder back end side, and at least one digital hydraulic pressure controller (3) which is integrated into the assembly. Said pressure controller is associated with the chamber on the cylinder head side and the chamber on the cylinder back end side and controls a supply of working fluid to and a discharge thereof from the chambers to adjust the pressure of the working fluid in at least one of the chambers of the hydraulic cylinder (2).

Description

technical field [0001] The present invention relates to a hydraulic cylinder assembly of a machine for producing fibrous webs, in particular a paper or board machine. Background technique [0002] In paper machines, control cylinders are widely used as operating and control devices. The control cylinder is preferably driven hydraulically, so that it can be adjusted and applied with a high degree of precision. [0003] Generally, it is necessary to use a working fluid, such as hydraulic oil, air, water, various gases or emulsions of the aforementioned fluids, etc., and apply pressure to the working fluid through a pump. The introduction of hydraulic oil under pressure into hydraulic actuators, such as hydraulic cylinders or hydraulic motors, is usually controlled by means of proportional control valves (proportional valves), which can be actuated electrically, hydraulically or pneumatically. [0004] Such a control valve has a reciprocating control spool or a control piston...

Claims

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Application Information

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IPC IPC(8): F15B15/20F15B11/042
CPCF15B15/202F15B2211/40592F15B11/0426
Inventor 维莱・霍波宁阿托・伊科宁
Owner VALMET TECH OY
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