Apparatus and method for damping or preventing partial vibration of paper machine

A vibration damping device, technology for paper machines, applied in the direction of paper machines, textiles and papermaking, papermaking, etc., capable of solving problems such as unprepared connections and increased costs

Inactive Publication Date: 2007-05-23
VALMET CHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a viscous damping element is prone to the problem that sufficient dynamic stiffness in the structure of the machine or in its foundation is not ready for the connectio

Method used

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  • Apparatus and method for damping or preventing partial vibration of paper machine
  • Apparatus and method for damping or preventing partial vibration of paper machine
  • Apparatus and method for damping or preventing partial vibration of paper machine

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Embodiment Construction

[0025]The invention adopts a vibration damping element that absorbs vibration energy. This damping element is a viscous damping shock absorber related to the speed of the vibration part, and its function can be expressed by the following formula

[0026] mx″+cx′+kx=F(t) formula (1)

[0027] among them:

[0028] m is the quality;

[0029] c is the damping coefficient (standard);

[0030] k is the coefficient of elasticity;

[0031] F(t) is the system load that changes with time;

[0032] x" is acceleration;

[0033] x′ is the speed;

[0034] x is the displacement.

[0035] In the above formula, the viscous damping damper that generates F(t) can be realized through various technical solutions, and the mutual relationship between them can be referred to the following known technology.

[0036] In the hysteretic damping shock absorber, the damping damping force generally depends on the deformation (ie displacement) of the damping and damping material. The function of hysteresis dampin...

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Abstract

The invention relates to a system and method for the absorption and prevention characterized by oscillations of a paper-making machine part, as for example a press part, a dryer part, a press-polishing part, a paper retractor - unwind stand partly, by the fact that between the paper-making machine part and are arranged the paper-making machine part or the part of a building (50), exhibiting regarding this part a repeated mass and a larger oscillation damping capacity, at least the oscillation energy absorbing absorption part (3).

Description

Technical field [0001] The present invention mainly relates to a device and method for reducing and preventing vibrations of the paper machine part such as the calender part of the paper machine, especially the multi-roll calender part. Background technique [0002] Multi-roll calenders generally have one or more resonant frequencies in the operating area. If the imbalance of a certain roll is greater than the conventional amount, the rotation frequency of one or more main calender rolls will cause problems. In the current paper machine, the damping vibration damping components used in the structure of the calender are generally dynamic silencers, in which the vibrating machine part is connected with a movable mass through one end of a lever. In dynamic silencers, the overall structure is generally adjusted to reach the frequency of the vibration part before trial operation. This method is very time consuming. In addition, each dynamic muffler runs at its own unique frequency; if...

Claims

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Application Information

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IPC IPC(8): D21G9/00D21G1/00D21GF16FF16F15/02
CPCD21G1/008F16F15/02
Inventor 米卡·奥尔科宁埃尔基·莱诺宁米科·奥利拉
Owner VALMET CHINA CO LTD
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