Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
  • D21G1/00—Calenders; Smoothing apparatus
  • D21G1/0073—Accessories for calenders
  • D21G1/008—Vibration-preventing or -eliminating devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
  • B21B2203/44—Vibration dampers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/16—Adjusting or positioning rolls
  • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
  • B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
  • B21B31/28—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal by toggle-lever mechanisms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
  • B21B35/02—Drives for metal-rolling mills, e.g. hydraulic drives for continuously-operating mills
  • B21B35/04—Drives for metal-rolling mills, e.g. hydraulic drives for continuously-operating mills each stand having its own motor or motors
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
  • B21B35/14—Couplings, driving spindles, or spindle carriers specially adapted for, or specially arranged in, metal-rolling mills
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
  • B21B37/007—Control for preventing or reducing vibration, chatter or chatter marks

Definitions

• the invention relates to an apparatus for controlling the vibration of rolls rotating in contact with each other during operation, whereby the apparatus comprises a frame, to which the bearing blocks of both rotating rolls are attached, an arrangement to rotate the rolls and an arrangement to move and support the bearing housings of the rolls in order to produce nip forces between different rolls and supports for the rolls.
• the bearing housing of the first roll is by means of the first arm supported in the frame, which arm is from its other end fixed to the frame by a joint and the first end supported in the frame by means of a load cell and, further, the apparatus has a locking unit loading said end against said load cell, and the bearing housing of the second roll is supported in the frame by means of another arm, which arm is from its other end fixed to the frame by a joint, and to support the second arm in the frame there is in the apparatus a knee-joint linkage affecting the magnitude of nip load and supporting the second arm, the knee-joint of which linkage is affected by a power required to increase or decrease the angle of the knee-joint.
• the advantage of the apparatus as per this invention is that both by normal operation of the apparatus and by dynamic testings of th ⁇ apparatus the stiffness properties of the system can be modified.
• the same loading device can support the roll either stiffness or flexibly, while keeping the nip load unchanged.
• the nip load is fully adjustable and, similarly, different support stiffnesses of roll can be freely chosen for each chosen nip load.
• the apparatus is suitable for dynamic examination of calenders and for continuous use in a production plant, whereby the system stiffness can be easily changed, while the rotation speeds of rolls are changing, on changing the nip load or, when for instance, as a result of wear due to long term operation, the stiffness of system must be changed to avoid vibrations.
• Fig. 1 is the apparatus viewed from one end.
• Fig. 2 is the apparatus and rotary system diagonally viewed from the side.
• Figure 1 shows a calender with two rolls viewed from the end, whereby the first roll, i.e. the upper roll 4, has a bearing housing 7, by means of which roll 4 is fixed to first arm 5.
• Arm 5 is from its other end by means of a joint fixed to frame post 1. The other end of the first arm rests by means of load cell 10 on a support shelf in the post.
• hydraulic cylinder 8 the first arm 5 can be loaded in pulling it against load cell 10.
• the second roll 3, i.e. the lower roll, is by means of bearing housing 7 fixed to second arm 2.
• the second arm 2 is from its one end fixed to post 1.
• the other end of the second arm can move freely between the two supporting shelves of the right side post without touching the support shelves during normal operation.
• the second arm 2 is supported by means of knee joint linkage 9.
• the joint linkage 9 is kept in a wanted angle ⁇ . The angle must be greater than zero.
• Cylinder 8 is the locking cylinder of upper arm 5 and the tractive force by which it pulls the upper arm 5 end against load cell 10 is chosen substantially greater than the nip force.
• cylinder 8 can be replaced by a spring, as a cup spring set, weights or similar, which cause required pretension against load cell 10.
• the nip force produced by cylinder 6 tends to lighten the load of load cell 10.
• the nip force can be counted from the load difference between cylinder 8 and load cell 10. Due to the solution first arm 5 and the bearing housing 7 of first arm 4 are tensioned, while rolls are rotating and first arm 5 having great stiffness.
• a pressure accumulator can be added that allows cylinder 8 to yield if for some reason or other overloading occurs in the first roll.
• An overload situation occurs, when first arm 5 does not any more press load cell 10. Almost in this situation, at the latest, the locking cylinder 8 should be adjusted to yield against the pressure accumulator.
• arm 5 presses the load cell by substantial force. Detection of proper rigidity for the system is done after the assembly in choosing the angle ⁇ and the pressures of cylinders 6 and 8.
• FIG. 2 shows an apparatus including rotary arrangements. Both rolls 3 and 4 are rotated by means of an own motor 14, a gearing 13 and an articulated shaft 11,12.
• the motor operations and the rolls form a torsional vibration system that receives impulses from tooth contact situations of the gearings, from torque formation of electric motors and from variations of the reeling resistance of roll covers.
• a coupling 17 In order to control and observe torsional vibrations, between gearing 13 and the articulated shaft a coupling 17 has been installed, the flexing and damping qualities of which can be varied within limits wanted.
• Control of nip force and retain of set value is adjusted, for instance in transmitting the signal out of load cell 10 to the proportional valve that controls the pressure of the pushing side (+) of cylinder 6.
• the proportional valve that controls the pressure of the pushing side (+) of cylinder 6. In the chamber of cylinder 6 secondary side (-) a certain pressure is maintained, if one wants to use said chamber to damp passive vibration.

Landscapes

• Vibration Prevention Devices (AREA)
• Rolls And Other Rotary Bodies (AREA)
• Orthopedics, Nursing, And Contraception (AREA)
• Buildings Adapted To Withstand Abnormal External Influences (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Photographic Developing Apparatuses (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=8561007

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (3)

Family Cites Families (3)

• 2001
  • 2001-04-19 FI FI20010800A patent/FI110712B/fi active
• 2002
  • 2002-04-18 DE DE60215792T patent/DE60215792T2/de not_active Expired - Fee Related
  • 2002-04-18 WO PCT/FI2002/000325 patent/WO2002086340A1/en active IP Right Grant
  • 2002-04-18 EP EP02720026A patent/EP1386090B1/de not_active Expired - Lifetime
  • 2002-04-18 AT AT02720026T patent/ATE344399T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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