JPH0734959Y2 - Nip change auxiliary device in calendar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a nip change assisting device for a calendar provided between a dryer section and a reel section of a paper machine.

[Prior Art] Conventionally, as shown in FIG. 3, a calendar provided in a paper machine of this type has driven calendar rolls 10 and 14 arranged in upper and lower stages and driven calendars arranged between them. It has a calendar roll 12 and. The web w dried in the dryer unit 2 is guided by the guide rolls 22 and 22 and guided to the top of the outer peripheral surface 100 of the upper driven roll 10,
It is wound around the outer peripheral surface 100 and is turned around between the upper driven calendar roll 10 and the driven calendar roll 12 and is wound around the outer peripheral surface 120 of the driven calendar roll 12 to be driven calendar roll 12 and the lower driven roller. It is guided to the reel unit 3 by being guided by the guide roll 22 between the calender roll 14 and the reel unit 3 and is wound up by the reel unit 3 and then unwound as an original fabric. The lower driven calender roll 14 of the calender unit 1 is rotatably supported by a bearing 142 whose shaft end is fixed to the machine frame. On the other hand, the upper driven calender roll 10 and the driven calender roll 12 are axially supported by the nip relieving device 4 so that the upper and lower positions thereof can be changed. That is, the nip releasing device 4 has a longitudinal direction substantially horizontal,
It is equipped with two lift arm pairs 40 and 42 that are swingably supported around 400 and 420.
A bearing (not shown) that pivotally supports the upper driven calendar roll 10 is provided at one end 402 of the, and a bearing that axially supports the driven calendar roll 12 is provided at one end 422 of the lift arm pair 42. And lift arm pair 4
The other ends of the rolls 0 and 42 are rotatably connected to a roll lift bar 440 that is provided so that the lower end of the roll lift main body 44 can project and retract substantially vertically upward. Nip releasing device 4
Can independently change the positions of the upper driven calendar roll 10 and the driven calendar roll 12 via the lift arms 40 and 42, and the outer peripheral surface 10 of each calendar roll 10 and 12 can be changed.
Between 0 and 120, and the outer peripheral surface 12 of each calendar roll 12, 14.
Forming pressure nips n1 and n2 between 0 and 140,
In addition, the pressure nips n1 and n2 can be opened. In addition to the nip relieving device 4 as described above, various types of nip relieving devices that independently pressurize and release the pressure nips n1 and n2 are used. As is well known, the driven calendar roll 12 is driven by a calendar roll driving device 122 having an electric motor capable of adjusting the rotation speed, and the calendar roll driving device 122 drives the web winding shaft of the reel section 3. It cooperates with a web winding shaft drive device 30 whose rotation speed can be changed.

In general, paper machines continuously and continuously produce web products having various standard specifications. Among these product standard specifications, when making webs with different surface smoothness, in order to obtain a web with high smoothness, pressure nips n1 and n2 are formed to strengthen the calendering process (usually called 2 nip process). ),
Further, in order to make the web with low smoothness (sublime), in order to weaken the calendering process, the pressure nip n1 is opened and only the pressure nip n2 is calendered (usually referred to as one nip process). That is, as shown in FIG. 2a, the low smoothness treatment is performed in one nip, and the high smoothness treatment is performed in two nips as shown in FIG. 2b. , The outer peripheral surface 100 of the upper driven calendar roll 10 plays a role against the outer peripheral surface 120 of the driven calendar roll 12.
The position is changed so that it is separated by about mm.
The upper and lower driven calender rolls 10 and 14 are attached to the outer peripheral surface 10 during the 1-nip process and the 2-nip process.
The driven calendar roll 12 is rotated at a peripheral speed substantially the same as the peripheral speed of the driven calendar roll 12 through the web w wound around the wheels 0 and 140 and traveling.

Now, when changing the web surface smoothness from high to low in the product standards, the nip releasing device 4 is operated to raise the upper driven calendar roll 10 as described above. The path of the web w is extended by that amount. Therefore, a dryer roll driving device (not shown) provided in the dryer unit 2 is operated to gradually reduce the speed of the web winding shaft driving device 30 in proportion to the increment of the upper driven calendar roll 10 to increase the web speed. The running speed of the web w is gradually reduced so that the paper is not torn due to the strong pulling of w, and the product specification is changed smoothly and without interruption.

[Problems to be solved by the invention] However, changing the web surface smoothness from low to high,
That is, when changing from 1 nip processing to 2 nip processing,
It suffices to accelerate the upper driven calendar roll 10 in proportion to the change in the down stroke of the upper driven calendar roll 10, but since the upper driven calendar roll 10 does not have a drive device, the rotational speed of the driven calendar roll 12 and Cannot be synchronized. If the upper driven calender roll 10 is lowered without adjusting its outer peripheral speed, the web w is slackened, and as a result, the web w is gradually separated from the outer peripheral surface 100 of the upper driven calender roll 10 and the upper driven calender roll 10 is moved. 10 gradually slows down. If the outer peripheral surface 100 of the upper driven calender roll 10 is wound around the driven calender roll 12 and brought into contact with the web w running at a high speed of 1200 m / min. The impact is added to the web w and causes a great disaster.

Therefore, as shown in FIG. 3, in the change operation from the 1-nip process to the 2-nip process, first, the web w is cut by the full-width cutter 5 arranged between the dryer unit 2 and the calendar unit 1, and then, The calendar roll driving device 122 is operated to stop the calendar unit 1. Under this stopped state, the upper driven calendar roll 10 is lowered to bring its outer peripheral surface 100 into contact with the outer peripheral surface 120 of the driven calendar roll 12 so that a desired pressure nip n1 is formed. Then, it is confirmed that the calendar unit 1 is operated and the rotation speed has risen to a predetermined speed, and the tail w slit by the tail cutter (not shown) to a width of about 100 mm is air jet j from the air nozzles a1 and a2. The tail w is blown off and guided to the calendar unit 1, and the tail w is passed through the nip n1 and n2. After that, the width of the tail was widened and the entire width of the paper was passed through to restart the operation.

As described above, every time the web surface smoothness treatment is changed from low to high, not only the calender unit 1 has to be brought into the operation stop state, but also a large amount of waste paper r as shown in FIG.
Had to be dropped from the dryer section 2 to an unillustrated spoilage paper recovery pit under the floor. This causes a great loss.

[Technical Problem] The present inventors achieved the present invention by repeatedly observing and analyzing the calendar unit 1 in the field in order to solve the above problems.

That is, when the web surface smoothness is changed from low to high, the tension in the longitudinal direction of the web w becomes loose as described above. In order to eliminate this slack, the web winding shaft drive unit 30 of the reel unit 3 is operated so as to increase the winding speed of the web w on the reel unit 3 in proportion to the descending degree of the upper driven calendar roll 10. By doing so, the calendar roll driving device 122, which is associated with the web winding shaft driving device 30, is also accelerated at the same rate to eliminate the looseness of the web w, and therefore even when the web surface smoothness is changed. As described above, the web w never separates from the outer peripheral surface 100 of the upper driven calendar roll 10, and the web w surely abuts and winds around the outer peripheral surface 100 to run, and the web w causes the upper driven calender roll 10 to move. It is possible to continue the rotation such that the driven calender roll 12 gradually approaches the outer circumferential speed substantially the same as the outer circumferential speed.

Therefore, at the time of changing the web surface smoothness, if there is a means for confirming and determining the outer peripheral speed value of the upper driven calendar roll 10, smooth and without causing damage or breaking of the web, and as described above, The present invention has been completed by finding that it can operate without interruption without stopping the part 1.

[Means for Solving the Problems] According to the present invention, it is provided between a dryer section and a reel section of a paper machine, and the webs dried by the dryer section are arranged in upper and lower stages for calendar processing, respectively. A driven calender roll and a driven calender roll disposed therebetween, and a nip relieving device for forming a pressure nip between each calender roll and independently opening each pressure nip. A calendar roll driving device for driving the driven calender rolls, and a rotation speed changeable web winding shaft driving device for driving the web winding shaft of the reel part in cooperation with the calendar roll driving device. In a nip change assisting device for a calendar equipped with the above, an upper driven calender roll rotation speed detection device provided for the upper driven calender roll is provided. A driven calendar roll rotation speed detection device provided in the driven calendar roll, and a roll outer peripheral speed difference ratio calculated from each rotation speed detection signal from each calendar roll rotation speed detection device and the roll outer circumference. A nip change assist for a calendar characterized by comprising a roll outer peripheral speed difference ratio calculation judgment display device which is adapted to emit a signal when the value of the speed difference ratio falls below a preset value. A device is provided.

(Operation) Since the nip change assisting device in the calendar according to the present invention has the above-mentioned structure, the surface smoothness of the web is changed from low to high, that is, from 1 nip process to 2 nip as described above. In changing to the processing, the knob of the roll outer peripheral speed difference ratio calculation determination display device of the calendar portion is operated to set and set the respective roll outer peripheral speed difference ratio set values of the calendar portion. Next, while visually observing the lighting display of the roll outer peripheral speed difference ratio calculation determination display device, the web winding shaft driving device of the reel portion is operated to gradually increase the web winding speed, and at the same time, the nick of the calendar portion is increased. Operate the pre-leaving device to lower the upper driven calendar roll position. Each of the above operations must be performed such that the value of the roll outer peripheral speed difference ratio is always less than or equal to the roll outer peripheral speed difference ratio set value, that is, the roll outer peripheral speed difference ratio calculation determination display device emits a signal. I have to. The reason is that if the value of the roll outer peripheral speed difference ratio exceeds the set value, the signal is not emitted, that is, the web running between the calendar section and the reel section is related to its running direction. It is in a loose state. Therefore, at this time, if the signal is immediately issued, that is, if the value of the roll outer peripheral speed difference ratio is corrected to be equal to or less than the set value, the traveling between the calendar portion and the reel portion is performed. The web is adjusted to run with the proper tension (tension that does not cause paper breaks) with respect to its direction of travel, i.e. the web is stretched by its draw.

Thus, the web runs in contact with the outer peripheral surface of the upper driven calender roll without being separated from the outer peripheral surface of the upper driven calender roll, so that the upper driven calender roll is not decelerated by the web and the web winding shaft is driven. It is rotated at an outer peripheral speed substantially the same as the outer peripheral rotational speed of the driven calendar roll that is driven in cooperation with the apparatus. Therefore, when the pressure nip is formed by the contact between the outer peripheral surface of the upper driven calender roll and the web portion wound around the outer peripheral surface of the driven calender roll, the contact is performed softly and as described above. There can be no web damage or breaks. Therefore, the 1-nip process can be changed to the 2-nip process very smoothly and safely, and continuous operation without interruption is possible.

(Embodiment) An embodiment of a nip change assisting device in a calendar according to the present invention will be described in detail with reference to FIG. 1 showing a schematic side view.

An embodiment of a nip change assisting device in a calendar according to the present invention is provided between a dryer section 2 and a reel section 3 of a paper machine, and is used for calendaring a web w dried by the dryer section 2. Outer diameter 600 mm arranged in each of the upper and lower rows
Of the driven calender rolls 10 and 14 and a driven calender roll 12 having an outer diameter of 600 mm disposed between the calender rolls 10 and 14 and pressure nip n1 and n2 between the calender rolls 10, 12 and 14, respectively. , n2 for independently opening n2 and n2, a calendar roll driving electric motor 122 for driving the driven calendar roll 12, and a web winding shaft 300 of the reel unit 3 for driving the calendar roll. A nip change assisting device in a calendar 1 comprising a web winding shaft driving electric motor 30 capable of changing the rotational speed for driving in cooperation with 122, and provided on a driven shaft 102 of an upper driven calender roll 10. A rotary encoder 104 for detecting the rotational speed of the driven calendar roll 12, a pulse generator 126 for detecting the rotational speed of the driven shaft 124 of the driven calendar roll 12, and a low speed Lee encoder 104 and the signal output from the pulse generator 126 p1, p2 each rotational speed detection signal is inputted values p1, p2 and converted to roll outer velocity values v1, v2 roll outer speed difference ratio [v
r = (v1−v2) / v1], and the set value vro set by operating the knob 64 in advance and the roll outer peripheral speed difference ratio vr are compared, and the set value vro is set. The decision unit 62 that outputs an okay signal o and the okay signal o
And a roll outer peripheral speed difference ratio calculation determination display device 6 having a display 66 which is turned on.

Now, when the calendar unit 1 is performing the two-nip process, when the surface smoothness of the web w is changed from high to low, that is, when the one-nip process is changed, the roll lift main body 44 of the nip releasing device 4 is used. To gradually raise the upper driven calendar roll 10 via the roll lift bar 440 and the lift arm pair 40, i.e., to gradually open the nip n1 and in proportion to the increment increment of the upper driven calendar roll 10. The calendar roll driving electric motor 122 is operated to decelerate. Therefore, the traveling path of the web w extends as the upper driven calender roll 10 rises, and the driven calender roll 12 and the web winding shaft driving electric motor 30 associated therewith are commensurate with the elongation. Will slow down,
Substantially no tension is applied to the web w in the longitudinal direction of the web w, and the nip n1 is smoothly opened without loosening the web w, and the calender unit 1 shifts to one nip processing. In order to change the surface smoothness of the web w from low to high while 1 is performing 1 nip treatment, that is, to change the calendar portion 1 to 2 nip treatment, first, the roll outer peripheral speed difference of the calendar portion 1 is changed. Ratio calculation judgment display device 6 knob 64
Turn the roll outer peripheral speed difference ratio set value vro to, for example, vro
Set so that = 0.002. At this time, since the upper driven calendar roll 10 is rotated by the driven calendar roll 12 via the web w without slipping, the signal p1 from the rotary encoder 104 and the signal p2 from the pulse generator 126 are sent to the calculator 60. The input values are converted into the roll outer peripheral speed values v1 and v2, respectively, and the roll outer peripheral speed difference ratio vr [Vr = (V1-V2) / V1] is calculated. Then, the determiner 62 compares the calculated roll outer peripheral speed difference ratio value vr and the set value vro, but as described above, the upper driven calendar roll 10 and the driven calendar roll 12 have the same peripheral speed. Since it is rotating, the okay signal o from the judging device 62
Is output and the display 66 is turned on. By visually observing the lighting of the indicator 66, the upper driven calendar roll lifting handle 442 provided on the roll lift main body 44 of the nip releasing device 4 is operated to gradually lower the upper driven calendar roll 10 and at the same time, the calender roll is moved. A web winding shaft drive device 30 for the reel unit 3 that operates in cooperation with the drive motor 122.
The web winding speed is gradually increased by operating the web winding speed adjusting knob 302 provided on the. At this time, the operator performs the above operation while constantly monitoring the display 66. If the indicator 66 goes out during the above operation (this is because the outer peripheral surface 100 of the upper driven calendar roll 10 and the web w wound around it are separated from each other), the web winding speed is immediately adjusted. The knob 302 is gradually operated toward the speed increasing side so that the web w running between the upper driven calendar roll 10 and the dryer unit 2 is stretched. Thus, the web w comes into contact with the outer peripheral surface 100 of the upper driven calender roll 10 without fail, and the upper driven calender roll 10 is driven to accelerate through the contact web w so that the display 66 is turned on again. Become. As described above, the indicator 66 lights up to indicate that the upper driven calender roll 10 and the driven calender roll 12 are rotating at substantially the same outer peripheral speed. It can be changed to processing.

In the above embodiment, the rotary encoder 104 provided on the driven shaft 102 of the upper driven calendar roll 10 has a gear having 55 teeth in one round attached to the driven shaft 102, and is provided close to the teeth. Proximity switch with upper driven calendar roll
It has a well-known structure for detecting the number of rotations of 10, and various structures can be used. Also, the pulse generator 126
Is a well-known structure which is provided on the drive shaft of the calendar roll driving electric motor 122 for driving the driven calendar roll 12 and outputs 480 pulses for one round, and various structures can be used. Roll outer peripheral speed difference ratio calculation judgment display device 6
At this time, the signal p1 from the rotary encoder 104 is input to calculate the outer peripheral speed v1 of the upper driven calendar roll 10, but by using this outer peripheral speed signal v1, a digital tachometer (not shown) of well-known configuration is used. ) Is operated to display the outer peripheral speed of the upper driven calendar roll 10.

(Effects) As described above, according to the present invention, it is not only necessary to stop the calender unit one by one when changing the web surface smoothness from low to high in the calender unit (changing from 1 nip process to 2 nip process). It is no longer necessary to drop a large amount of web into the waste paper collection pit, etc. In addition, the conventional change operation required about one and a half hours, but it was smooth and safe in just a few minutes. It enables continuous operation.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of a nip changing assisting device in a calendar section according to the present invention, and FIG. 2 is a 1 nip processing (FIG. 2a) and a 2 nip processing (FIG. 2) in the calendar section.
FIG. 2b) is a schematic side view, and FIG. 3 is a schematic side view showing a conventional calendar portion. (Explanation of symbols) 1 …… Calendar (part) 10 …… Upper driven calendar roll 104 …… Roll rotation speed detection device (rotary encoder) 12 …… Driven calendar roll 122 …… Calendar roll driving device (driving motor) 126 …… Roll speed detector (pulse generator) 14 …… Lower driven calendar roll 2 …… Dryer part 3 …… Reel part 30 …… Web winding shaft drive device 302 …… Web winding speed adjustment knob 4 …… … Nip relieving device 40, 42 …… Lift arm pair 44 …… Roll lift body 440 …… Roll lift bar 6 …… Roll outer peripheral speed difference ratio calculation judgment display device 60 …… Calculator 62 …… Judger 64 …… Roll outer peripheral speed difference ratio setting knob 66 …… Display n1, n2 …… Pressure nip p1, p2 …… Roll rotation speed detection signal vr …… Roll outer peripheral speed difference ratio signal vro …… Outer peripheral speed difference ratio setting Signal o …… Okay signal w …… Web

Claims (1)

[Scope of utility model registration request] 1. A driven calender roll disposed between a dryer part and a reel part of a paper machine and arranged in upper and lower stages for calendering a web dried by the dryer part, and disposed between them. Driven calender rolls, a nip relieving device for forming a pressure nip between the calender rolls and opening each nip independently, and a calender roll for driving the driven calender rolls. A nip changing auxiliary device in a calendar equipped with a drive device and a web take-up shaft drive device capable of changing the rotational speed for driving the web take-up shaft of the reel portion in cooperation with the calendar roll drive device. In the upper driven calendar roll rotation speed detecting device provided in the upper driven calendar roll and the driven calendar roll, A driven calendar roll rotation speed detection device, and a roll outer peripheral speed difference ratio is calculated from each rotation speed detection signal from each calendar roll rotation speed detection device, and the value of the roll outer peripheral speed difference ratio is set in advance. A nip change assisting device for a calendar, comprising: a roll outer peripheral speed difference ratio calculation / determination display device which emits a signal when the value becomes less than a predetermined value.