JP2009196330A - Controlling method for pressurizing belt of single facer and apparatus for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize automated means to resolve a circumference difference of both sides in width direction section of a pressurizing belt, without applying an overload only to one side of the pressurizing belt. <P>SOLUTION: In the controlling method for the pressurizing belt of the single facer controlling so as to diminish lose a circumference difference by detecting a circumference difference between the both sides a and b in width direction of a pressurizing belt, by loading a high pressurizing power to a pressurizing cylinder in the side which carries out advanced pressurizing belt 5 between a couple of a pressurizing cylinder 12a and 12b adjusting a distance between both end roll axes 8 and 9 of a couple of a pressurizing roll 6 and 7, by comparing a high pressure loading time of both of a pressurizing cylinder 12a and 12b in the setting time, a pressurizing cylinder which shows the longer one of a high pressure load time returns to the initial setting pressurization power Po, and the second step where a pressurizing force of a pressurizing cylinder which shows shorter one of high pressure load time Ta, Tb ia made a pressurizing force which reduced to a pressurizing value which is reduced pressure value ΔP which is beforehand established in pressurization power of pressurization cylinder of the shorter one, the second step described above is repeated every set time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a single facer that is installed in a corrugating machine and manufactures single-sided corrugated paper, and more particularly relates to a control method and apparatus for eliminating the circumferential difference in the width direction of a pressure belt in a pressure belt type single facer. .

  As shown in FIG. 6, the pressure belt type single facer 01 forms a core paper n in a corrugated shape through a core paper n between a pair of corrugated rolls 02 and 03 whose corrugated surfaces are corrugated, After gluing the corrugated core paper n formed in the corrugated shape with the gluing device 04, the core paper n and the endless pressure belt 05 are placed between one corrugated roll (downstream roll) 03 and the endless pressure belt 05. The liner paper l is passed in an overlapping manner, and the core paper n and the liner paper l are pressure-bonded at the time of passing to produce a single-sided cardboard paper k.

  The pressure belt 05 is usually made of an elastic material, for example, an FRP material coated with Teflon (registered trademark). The pressure belt 05 travels while being wound around a pair of pressure rollers 06a and 06b arranged in parallel. Then, by changing the distance between the pressure rolls, the tension of the pressure belt 05 is changed, thereby adjusting the pressure applied to the downstream roll 03 of the pressure roll.

  The pressure belt method has a longer contact range between the belt and the corrugated roll than the pressure roll method, etc., so that the contact pressure is small, and the generation of vibration and noise is low, resulting in an excellent quality corrugated paper. There are advantages.

  When manufacturing a pressure belt, it is difficult to form the circumference of both sides in the width direction to the same dimension, and the elongation of the both sides in the width direction can be different due to long-term use, or the parallelism of a pair of pressure rolls For reasons such as defects, a problem (advanced) in which one side advances ahead of the other side with the traveling of the pressure belt tends to occur. The side with the shorter circumference is advanced, twisting occurs in the advanced state, and there is a risk of damage if used for a long time.

  In a typical endless belt, a pair of pressure cylinders is provided between both ends of the pressure roll in order to adjust the distance between the pressure rolls around which the endless belt is wound. And in order to eliminate the above-mentioned trouble, after grasping the advanced state by the detector, increasing the pressurizing force of the pressure cylinder on the advanced side and making the peripheral length of the advanced side longer than the other, The advance of the belt on the side is offset.

  In Patent Document 1 (Japanese Patent Application Laid-Open No. 11-105172), metal detection objects are embedded on both sides of the pressure belt in the width direction, these detection objects are detected by a metal sensor, and based on the detection results. Of the pressure cylinders installed at both ends of the pair of pressure rolls, the pressure of the pressure cylinder on the advanced side is increased and the pressure cylinders are extended, so that the circumference of both sides of the pressure belt is increased. Means for eliminating the length difference is disclosed.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2001-121628) discloses a pair of pressure rolls around which a pressure belt is wound, and the pair of pressure rolls provided between both ends of the pair of pressure rolls. A pair of hydraulic cylinders that independently move both end positions of one of the tension adjusting rolls, and a position detector that detects both end positions of the tension adjusting roll, and the other of the pair of pressure rolls. When the difference in the distance from the position reference roll to the both ends of the tension adjusting roll exceeds a predetermined range, the difference between the circumferential lengths of both sides of the pressure belt is reduced by operating the hydraulic cylinder to eliminate the difference. Techniques to solve the problem have been taken.

JP-A-11-105172 JP 2001-121628 A

  In the means disclosed in Patent Document 1 or Patent Document 2, when the circumferential length difference between both sides in the width direction of the pressure belt occurs at the time of manufacturing the pressure belt, or when the pair of pressure rolls are assembled, the pressure roll If this occurs due to poor parallelism, the time during which the overtension is applied to the advanced side of the belt tends to be longer. For this reason, there is a problem that the advanced side is easily damaged by fatigue.

In the present invention, in view of the problems of the prior art, a difference in circumferential length between both sides in the width direction of the pressure belt is caused by a manufacturing failure of the pressure belt, or a pair of pressures around which the pressure belt is wound. An object is to eliminate the difference in circumferential length without overloading only one side of the pressure belt even when it occurs due to a parallelism failure of the pressure roll during roll assembly.
It is another object of the present invention to eliminate the need to manually eliminate the circumferential length difference and to avoid the operation of a single facer by automatically performing such operations.

In order to achieve the above object, a method for controlling a pressure belt of a single facer according to the first aspect of the present invention includes:
In the pressure control method of the single facer for detecting the circumferential length difference between both sides in the width direction of the endless pressure belt wound around the pair of pressure rolls, and controlling so as to eliminate the circumferential length difference,
A high pressure is applied to the pressure cylinder on the side where the pressure belt is advanced among the pair of pressure cylinders for adjusting the distance between the roll axes at both ends of the pair of pressure rolls, thereby widening the distance between the pressure roll axes. The first step;
The high pressure load times of both pressure cylinders are compared within the set time, the pressure cylinder with the longer high pressure load time is returned to the initial set pressure, and the pressure force of the pressure cylinder with the shorter high pressure load time is set in advance. A second step of applying a pressure obtained by subtracting the set pressure value,
By repeating the second step every set time, the belt circumferential length difference is eliminated without overloading one side in the width direction of the pressure belt.

  In the first method of the present invention, at the start of operation, an equivalent initial set pressure is applied to the pair of pressure cylinders. After that, the circumference difference of both sides in the width direction of the pressure belt is detected, and when the circumference difference has occurred, high pressure is applied to the pressure cylinder on the side where the pressure belt is advanced, Extend the length to eliminate the circumference difference (first step). At this time, the time during which high pressure is applied to both pressure cylinders is recorded.

  Then, in order to return the pressure cylinder having the longer high pressure load time within the set time (for example, 3 to 5 minutes) to the initial set pressure, a high pressure is applied to the advanced side of the pressure belt for a long time. There is nothing. At the same time, the circumferential pressure difference is increased on both sides of the pressure belt in the width direction, so that the pressure applied to the pressure cylinder with the shorter high-pressure load time is the pressure obtained by subtracting the preset pressure value from the initial set pressure. (2nd step).

  By repeating this operation every set time, the circumferential length difference is eliminated without overloading one side in the width direction of the pressure belt. Thereby, the running performance of the pressure belt can be stabilized.

In the first step of the first method of the present invention, when the ratio of the high pressure load time within the set time falls below the lower limit set value or exceeds the upper limit set value, the pressure cylinder having the longer high pressure load time May be returned to the initial set pressure, and the pressure applied to the pressurizing cylinder having a shorter high-pressure load time may be set to a pressure obtained by subtracting a preset pressure value.
As described above, the lower limit set value and the upper limit set value are provided, and the pressure of the pressurizing cylinder is not changed while the ratio of the high pressure load times of the two pressurizing cylinders is within the allowable range between the lower limit set value and the upper limit set value. By doing so, stability can be given to control.

Further, the pressure control method for the single facer of the second aspect of the present invention is as follows:
In the pressure control method of the single facer for detecting the circumferential length difference between both sides in the width direction of the endless pressure belt wound around the pair of pressure rolls, and controlling so as to eliminate the circumferential length difference,
Prepare a belt circumference adjusting device with a belt circumference adjusting head that advances and retreats with respect to the pressure belt on both sides in the width direction of the pressure belt,
A first step of extending the circumference of the pressure belt by extending the belt circumference adjustment head on the side where the pressure belt is advanced;
Within the set time, the belt circumference adjustment head with the longer pressurization belt extension time is extended by the set stroke, and the belt circumference adjustment head with the shorter pressurization belt extension time is not applied to the pressure belt in the initial stage. The second step of returning to position,
By repeating the second step every set time, the belt circumferential length difference is eliminated without overloading one side in the width direction of the pressure belt.

  In the second method of the present invention, at the start of operation, the circumferential length adjusting head is positioned at an initial position where no load is applied to the pressure belt. Thereafter, a difference in circumferential length between both sides in the width direction of the pressure belt is detected. When the circumferential length difference occurs, the circumferential length adjustment head on the side where the pressure belt is advanced is extended and the pressure belt is pushed. As a result, the circumference of the pressure belt is extended to eliminate the circumference difference (first step). At this time, the time for extending both circumference adjusting heads is recorded.

  Then, within the set time (for example, 3 to 5 minutes), the circumference adjustment head with the longer pressure belt extension time for advancement by the both circumference adjustment heads is extended by the set stroke, so that the circumference difference is reduced. Try to lose it. At the same time, the pressure applied to the pressure cylinder with the shorter high-pressure load time is set to a pressure obtained by subtracting a preset pressure value so as not to increase the circumferential length difference on both sides in the width direction of the pressure belt. (Second step).

  By repeating this operation every set time, the circumferential length difference is eliminated without overloading one side in the width direction of the pressure belt. Thereby, the running performance of the pressure belt can be stabilized.

  In the second step of the second method of the present invention, when the ratio of the pressure belt extension time within the set time is less than the lower limit set value or exceeds the upper limit set value, the pressure belt extension time is longer. The belt circumference adjusting head may be extended by a set stroke, and the belt circumference adjusting head having a shorter pressure belt extension time may be returned to the initial position where no load is applied to the pressure belt.

  In this way, the lower limit set value and the upper limit set value are provided so that the ratio of the set stroke extension time of the circumference adjustment head is not controlled between the lower limit set value and the upper limit set value, thereby enabling frequent control. The stability can be given to the control.

  In the first method of the present invention and the second method of the present invention, preferably, the lower limit set value is 0.87 and the upper limit set value is 1.15. From the knowledge of actual machine operation, if the lower limit set value is exceeded, or if the upper limit set value is exceeded, the pressure belt may be damaged. Therefore, it is preferable to perform control based on these set values.

Further, the single facer pressure belt control device of the first aspect of the present invention for carrying out the first aspect of the present invention comprises:
In the pressure belt control device of a single facer that detects a circumferential length difference between both sides in the width direction of an endless pressure belt wound around a pair of pressure rolls and controls to eliminate the circumferential length difference,
A pair of pressure cylinders for adjusting the distance between the roll axes on both ends of the pair of pressure rolls;
Compare the first step to increase the distance between the pressure roll axes by applying high pressure to the pressure cylinder on the side where the pressure belt is advanced, and the high pressure load time of both pressure cylinders within the set time. A second step is performed in which the pressure cylinder having the longer load time is returned to the initial set pressure, and the pressure of the pressure cylinder having the shorter high pressure load time is set to a pressure obtained by subtracting a preset pressure value. And a control device.

  With the above configuration, by repeating the second step every set time, it is possible to eliminate the circumferential length difference on both sides in the width direction of the pressure belt without overloading one side in the width direction of the pressure belt. . Therefore, the running performance of the pressure belt can be stabilized. In addition, since the control device can automate the control for eliminating the difference in circumference of the pressure belt, it is not necessary to stop the operation of the single facer.

In addition, the single facer pressure belt control device of the second aspect of the invention for carrying out the method of the second aspect of the invention comprises:
In the pressure belt control device of a single facer that detects a circumferential length difference between both sides in the width direction of an endless pressure belt wound around a pair of pressure rolls and controls to eliminate the circumferential length difference,
A plurality of belt circumference adjusting devices including belt circumference adjusting heads arranged on both sides in the width direction of the pressure belt and adjusting the circumference of the pressure belt by moving back and forth toward the pressure belt;
The first step of extending the belt circumference adjustment head on the side where the pressure belt is advanced to extend the circumference of the pressure belt, and the set stroke of the belt circumference adjustment head with the longer pressure belt extension time within the set time And a control device that performs a second step of extending the belt circumferential length adjusting head having a shorter pressure belt extension time to an initial position where no load is applied to the pressure belt.

  With the above configuration, by repeating the second step every set time, it is possible to eliminate the circumferential length difference on both sides in the width direction of the pressure belt without overloading one side in the width direction of the pressure belt. . Therefore, the running performance of the pressure belt can be stabilized. In addition, since the control device can automate the control for eliminating the difference in circumference of the pressure belt, it is not necessary to stop the operation of the single facer.

  In the first invention device or the second invention device, a belt circumference adjusting device having a belt circumference adjusting head is provided at the center in the width direction of the pressure belt, and the circumference of the center in the width direction of the pressure belt is provided. You may comprise so that length may be adjusted independently of the width direction both sides. Since there are various sheet widths of the sheet base paper passing between the pressure belt and the corrugated roll, the time during which the sheet base paper slides on the pressure belt is longer in the central portion than in both sides in the width direction.

  For this reason, when the sheet base paper is bonded, the central portion of the pressure belt may be advanced or moved backward as compared with the both side portions due to the influence of the frictional force of the sheet base paper in contact with the pressure belt. Therefore, by providing a belt circumference adjusting device having a circumference adjusting head at the center in the width direction of the pressure belt, and adjusting the stroke of the circumference adjusting head independently from both sides in the width direction, Can cancel out advanced or reverse movements.

According to the first or second aspect of the present invention, when the pressure belt is produced, a difference in circumferential length between both sides in the width direction is produced, or when the pair of pressure rolls is assembled to the single facer, a parallelism defect occurs. Even in such a case, the traveling performance can be stabilized by eliminating the circumferential length difference on both sides in the belt width direction without overloading only one side of the pressure belt. Accordingly, it is possible to eliminate the twist caused by the advancement of one side of the pressure belt, the fatigue failure due to the over tension load, and the meandering.
Further, since the control can be automated, it is not necessary to manually adjust the parallelism of the pressure rolls according to the belt circumference difference, and it is not necessary to stop the operation of the single facer.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the present invention to that only, unless otherwise specified.

(Embodiment 1)
An embodiment of the first invention will be described with reference to FIGS. FIGS. 1A and 1B show a part of the single facer 1. In FIG. 1, the pair of pressure rolls includes a circumferential difference adjusting roll 6 and a reference position roll 7. Both side roll shafts 9a and 9b of the reference position roll 7 are supported by a fixed bearing (not shown) so as to be rotatable and not to translate. Both end roll shafts 8a or 8b of the circumference difference adjusting roll 6 are connected to the hydraulic cylinders 12a or 12b via connection portions 11a or 11b, respectively.
In addition, when the several member or apparatus displayed by attaching | subjecting a different alphabetic character to the same number is shown only with a number, it is a description common to these members or apparatuses.

  The piston rod 13 of the hydraulic cylinder 12 is connected to the fixed frame 14 respectively. An endless pressure roll 5 is wound around the circumference difference adjusting roll 6 and the reference position roll 7. The pressure roll 5 is made of an elastic material, for example, an FRP material coated with Teflon (registered trademark). The pressure roll 5 is wound around the circumferential difference adjusting roll 6 and the reference position roll 7 to apply a tension, and thereby pressurizes the downstream side roll 3.

  Saturated steam is introduced into the downstream side roll 3 and the outer peripheral surface of the downstream side roll 3 is heated. Then, the sheet is pasted by being heated and pressurized by passing between the pressure roll 5 and the downstream side roll 3 in a state where the core paper (not shown) glued to the top of the step and the liner paper are overlapped.

  The hydraulic oil supply / discharge passages 15 and 16 are connected to the left and right oil chambers of the hydraulic cylinder 12, and the other ends of the hydraulic oil supply / discharge passages 15 and 16 are connected to the hydraulic oil supply source 17. An electromagnetic valve 18a is interposed in the hydraulic oil supply / discharge passages 15a and 16a, and an electromagnetic valve 18b is interposed in the hydraulic oil supply / discharge passages 15b and 16b. By controlling the opening / closing or opening degree of the electromagnetic valve 18 by the control device 20, the operation of the hydraulic cylinder 12 is controlled, and the pressure applied to both the roll shafts 8 a and 8 b of the circumferential length adjusting roll 6 is controlled. .

  Detection pieces (or detection marks) 21 a and 21 b are embedded in the same position in the circumferential direction at both ends in the width direction of the pressure belt 5. Further, a non-contact detector 22 for detecting the detection piece 21 is disposed at the same position in the circumferential direction of the pressure belt 5 so as to face both ends of the pressure belt 5 in the width direction. The detector 22 uses a conventionally known device such as a transmission phototube.

  In the present embodiment having such a configuration, in the control device 20, either one of both sides of the belt width direction is determined from the time difference between the time when the detection piece 21a is detected by the detector 22a and the time when the detection piece 21b is detected by the detector 22b ( Calculate how advanced the a side or b side) is. At the start of operation, the control device 20 operates the solenoid valve 18 to load the hydraulic cylinder 12 with an initial set pressure Po (for example, 8 MPa).

  After starting the operation, after detecting the advanced amount by the detectors 22a and 22b, the control device 20 applies a high pressure (for example, 1.0 to 1.1 MPa) to the hydraulic cylinder on the advanced side, and the piston rod By extending the length of the belt, the belt circumference on the advanced side is lengthened to offset the advanced amount. For example, when the circumference of the pressure belt 5 is 3000 mm and the circumference difference of 30 mm occurs on both sides, the high pressure is applied to the advanced hydraulic cylinder.

  At this time, the time Ta or Tb when the high pressure is applied to the hydraulic cylinder 12a or 12b is recorded inside the control device 20. A control flow performed by the control device 20 thereafter is shown in FIG. In FIG. 2, the ratio of time Ta or Tb during which high pressure is applied to the hydraulic cylinder 12a or 12b for advanced control within a certain set time (for example, 3 to 5 minutes) is compared. When Ta / Tb exceeds 1.15, the high pressure load time of the hydraulic cylinder 12a is 1.15 times or more of the high pressure load time of the hydraulic cylinder 12b. To ease.

  From the operational knowledge of the single facer 1, when Ta / Tb <0.87 or 1.15 <Ta / Tb, the pressure belt 5 is twisted, and there is a risk of fatigue failure due to meandering or over tension. I know that there is.

  Therefore, the applied pressure of the hydraulic cylinder 12a is returned to the initial set pressure Po, and the applied pressure of the hydraulic cylinder 12b is reduced from the initial set pressure Po by a pressure ΔP (for example, 40 KPa). If Ta / Tb> 1.15 even after the above operation, the pressure Pb of the hydraulic cylinder 12b is decreased in increments of ΔP and the pressure is adjusted until Ta / Tb ≦ 1.15 (step 1).

  When Ta / Tb <0.87, since the high pressure load time of the hydraulic cylinder 12b is 1.15 times or more that of the hydraulic cylinder 12a, the high pressure load state on the b side of the pressure belt 5 is relaxed. That is, the hydraulic cylinder 12a is reduced by the pressure ΔP from the initial set pressure Po, and the hydraulic cylinder 12b is returned to the default pressure Po. If Ta / Tb <0.87 even after the operation, the pressure Pa of the hydraulic cylinder 12a is decreased in increments of ΔP, and the pressure Pa of the hydraulic cylinder 12a is adjusted until 0.87 ≦ Ta / Tb. (Step 2).

  Steps 1 and 2 are repeated, and the pressures Pa and Pb of the hydraulic cylinders 12a and 12b are automatically controlled by the controller 20 until 0.87 ≦ Ta / Tb ≦ 1.15.

  According to the present embodiment, even when a one-sided advanced tendency occurs due to a difference in circumferential length between both sides in the width direction when the pressure belt is manufactured, a parallelism defect when the pressure belt is assembled, or the like, the control device 20 causes the hydraulic cylinder 12a or Since the one-side advanced state can be eliminated by automatically adjusting the pressing force of 12b, the running performance of the pressure belt 5 can be stabilized. Further, since this can be done without applying an overload to one side of the pressure belt 5, there is no possibility that the pressure belt 5 will be twisted, damaged or meandered.

  Further, when Ta / Tb <0.87 or 1.15 <Ta / Tb, there is a risk that the side where the over tension of the pressure belt 5 is applied will be damaged, but in the present embodiment, 0. Since the automatic control is performed so as to maintain the range of 87 ≦ Ta / Tb ≦ 1.15, the tension load of the pressure belt 5 becomes uniform and there is no fear of breakage. Further, since the control is not performed when the value is within the above range, frequent control can be eliminated and control stability can be maintained.

Further, the pressure switching time of the hydraulic cylinder 12a or 12b can be calculated from the data recorded in the control device 20, so that it is not necessary to additionally install an extra measuring instrument or mechanical part. Therefore, it is only necessary to construct software, and stable meandering control is possible at low cost.
Furthermore, because of the automatic control, there is no need to adjust the parallelism of the pressure rolls according to the belt circumferential length difference, so there is no need to suspend the operation of the single facer 1.

(Embodiment 2)
Next, a first embodiment of the second invention will be described with reference to FIGS. In FIG. 3, the same members or devices as those in FIG. 1 are denoted by the same reference numerals, and descriptions of these members or devices are omitted because they are duplicated. In the present embodiment, belt circumferential length adjusting devices 30a and 30b are provided in addition to the configuration of the first embodiment shown in FIG.

  The belt circumferential length adjusting devices 30 a and 30 b are hydraulic cylinders, and one end thereof is connected to a fixed frame 33 installed above the pressure belt 5. Then, piston rods 31a and 31b that can be expanded and contracted by hydraulic oil are provided, and belt circumferential length adjusting rolls 32a and 32b are rotatably mounted at the ends of the piston rods. The belt circumferential length adjustment roll 32 is positioned above the pressure belt 5 on both sides in the width direction of the pressure belt 5 and is arranged to be extendable and contractible toward the upper surface of the pressure belt. Other configurations are the same as those of the first embodiment.

  In the same way as the hydraulic cylinder 12, a hydraulic oil supply / discharge passage is connected to the left and right oil chambers (not shown) of the belt circumferential length adjusting roll 32, and the opening degree is controlled by the controller 20 in the hydraulic oil supply / discharge passage. Although an electromagnetic valve is interposed and the other end of the hydraulic oil supply / discharge path is connected to the hydraulic oil supply source 17, these are not shown.

  Next, the control method of this embodiment is demonstrated based on FIG. First, at the start of operation, an initial set pressure Po (for example, 8 MPa) is applied to the hydraulic cylinders 12 a and 12 b, and an initial set tension is applied to the pressure belt 5. As a result, an initial set pressure is applied to the sheet base paper passing between the pressure belt 5 and the downstream side roll 3.

In this embodiment, the initial set pressure Po is applied to the hydraulic cylinder 12a or 12b at the start of operation, the initial tension of the pressure belt 5 is set, and then only the tension adjustment of the pressure belt 5 is performed. It is not involved in advanced control of the pressure belt 5.
Further, at the start of operation, the belt circumferential length adjusting rolls 32 a and 32 b are positioned at an initial stroke position Lo that contacts the pressure belt 5 but does not extend the pressure belt 5.

  Next, the detection piece 21 is detected by the detector 22 to grasp the advanced amount on one side (a side or b side) of the pressure belt 5. Then, the belt circumferential length adjusting roll of the belt circumferential length adjusting device on the advanced side of the pressure belt 5 is extended to extend the belt circumferential length and offset the advanced. At this time, the time Ta or Tb in which the stroke of the belt circumferential length adjusting roll 32a or 32b is extended is recorded in the control device 20 and processed. The subsequent control flow is shown in FIG.

  In FIG. 4, the ratio of the times Ta and Tb at which the belt circumference adjusting roll 32a or 32b of the belt circumference adjusting roll 32a or 32b has extended the stroke for advanced control within a set time (for example, 3 to 5 minutes). Compare In the case of Ta / Tb> 1.15, since the a side has an advanced tendency, an operation to alleviate the a-side advanced tendency is performed. In other words, the circumferential length on the a side of the pressure belt 5 is extended by setting the stroke position of the belt circumferential length adjusting roll 32a to a position that is extended by ΔL from the initial stroke position Lo. On the other hand, the stroke position of the belt circumferential length adjusting roll 32b remains the initial stroke position Lo.

When Ta / Tb> 1.15 after the above operation is satisfied, the control device 20 extends the stroke position of the belt circumferential length adjusting roll 32a in increments of ΔL, and the belt circumferential length until Ta / Tb ≦ 1.15. The stroke position of the adjustment roll 32a is adjusted (step 1).
In the case of Ta / Tb <0.87, the b side has an advanced tendency. Therefore, in order to alleviate this tendency, the stroke position of the belt circumferential length adjusting roll 32b is changed from the initial stroke position Lo to Lo + ΔL. On the other hand, the stroke position of the belt circumferential length adjusting roll 32a is returned to the initial stroke position Lo.

  If Ta / Tb <0.87 even after the above operation, the stroke position of the belt circumferential length adjusting roll 32b is increased in increments of ΔL until Ta / Tb ≧ 0.87. Adjust the position. Steps 1 and 2 are repeated, and the stroke positions of the belt circumferential length adjusting rolls 32a and 32b are automatically controlled by the control device 20 until 0.87 ≦ Ta / Tb ≦ 1.15.

According to this embodiment, even when a circumferential length difference occurs in both sides in the width direction when the pressure belt is manufactured, or when one-sided advanced tendency occurs due to poor parallelism when the pressure belt is assembled, the hydraulic cylinders 12a or 12b. The one-side advanced state can be eliminated without applying an overload to one side of the pressure belt 5 by automatically adjusting the pressure. As a result, traveling performance can be stabilized.
In addition, the same effects as those of the first embodiment can be obtained.

(Embodiment 3)
Next, a second embodiment of the second invention will be described with reference to FIG. In FIG. 5, the present embodiment is such that a belt circumferential length adjusting device 30 c is further arranged at the center of the upper surface of the pressure belt 5 in the configuration of the second embodiment shown in FIG. 3. Similar to the belt circumference adjusting devices 30a and 30b, the belt circumference adjusting device 30c includes an expandable / contractible piston rod 31c and a belt circumference adjusting roll 32c attached to the tip of the piston rod 31c. Other configurations are the same as those of the second embodiment.

  The control flow in this embodiment is the same as that in the second embodiment. Passing between the pressure belt 5 and the downstream corrugated roll 3 when producing the single-sided corrugated paper k by sandwiching the core paper n and the liner paper l between the pressure belt 5 and the downstream corrugated roll 3. Since there are various sheet widths of the sheet base paper, the time during which the sheet base paper slides on the pressure belt is longer at the center than at both sides in the width direction. For this reason, the central portion of the pressure belt 5 may be advanced or moved backward as compared with the both side portions due to the influence of the frictional force of the sheet base paper in contact with the pressure belt 5.

In the present embodiment, by controlling the stroke of the belt circumference adjusting roll 32c of the belt circumference adjusting device 30c, it is possible to cancel the advance or reverse of the belt center portion.
The operation of the belt circumferential length adjusting device 30c is not controlled by the control device 20, but is manually operated by an operator who visually observes the state of the belt central portion.

  According to the present embodiment, in addition to the effects of the second embodiment, even when the central portion of the pressure belt 5 is advanced or moved backward as compared with the both side portions due to the frictional force of the sheet base paper, the belt circumference adjustment By expanding and contracting the roll 32c, it is possible to prevent the pressure belt 5 from being twisted, deformed, meandering, or the like, by eliminating the forward or backward movement of the central portion.

  In this embodiment, the belt circumferential length adjusting device 30c is additionally provided in the configuration of the second embodiment. Instead, the belt circumferential length adjusting device 30c is additionally provided in the configuration of the first embodiment. Also good.

  According to the present invention, in a single facer for producing single-sided corrugated paper, an automated means that eliminates the risk of twisting, deformation, breakage, or meandering of the pressure belt by eliminating one-sided advancement of the pressure belt is realized. can do.

1A is a partial front view explanatory view of a single facer, and FIG. 2B is a plan view explanatory view according to the first embodiment of the present invention. It is a control flowchart of the first embodiment. FIG. 4A is a partial front view explanatory view of a single facer, and FIG. 5B is a plan view explanatory view according to a second embodiment of the first invention. It is a control flowchart of the second embodiment. It is a partial top view explanatory drawing of the single facer which concerns on one Embodiment of 2nd this invention. It is explanatory drawing of the conventional single facer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Single facer 3 Downstream side roll 5 Pressure belt 6 Circumferential length difference adjustment roll 7 Reference position roll 8a, 8b, 9a, 9b Roll shaft 12a, 12b Hydraulic cylinder (pressure cylinder)
20 Control devices 21a, 21b Detection pieces 22a, 22b Detectors 30a, 30b, 30c Belt circumference adjustment devices 32a, 32b, 32c Belt circumference adjustment rolls a, b Both sides in the width direction of the pressure belt 5 Lo Belt circumference adjustment Roll initial stroke position Pa Pressure of pressure cylinder 12a Pb Pressure of pressure cylinder 12b Po Pressure cylinder initial setting pressure

Claims (8)

In the pressure control method of the single facer for detecting the circumferential length difference between both sides in the width direction of the endless pressure belt wound around the pair of pressure rolls, and controlling so as to eliminate the circumferential length difference,
A high pressure is applied to the pressure cylinder on the side where the pressure belt is advanced among the pair of pressure cylinders for adjusting the distance between the roll axes at both ends of the pair of pressure rolls, thereby widening the distance between the pressure roll axes. The first step;
The high pressure load times of both pressure cylinders are compared within the set time, the pressure cylinder with the longer high pressure load time is returned to the initial set pressure, and the pressure force of the pressure cylinder with the shorter high pressure load time is set in advance. A second step of applying a pressure obtained by subtracting the set pressure value,
The single facer pressure belt control is characterized by eliminating the belt circumference difference without overloading one side of the pressure belt in the width direction by repeating the second step every set time. Method.   In the second step, when the ratio of the high pressure load time within the set time falls below the lower limit set value or exceeds the upper limit set value, the pressure cylinder with the longer high pressure load time is returned to the initial set pressure. 2. The pressurizing belt control for a single facer according to claim 1, wherein the pressurizing force of the pressurizing cylinder having a shorter high pressure load time is set to a pressurizing force obtained by subtracting a preset pressure value. Method. In the pressure control method of the single facer for detecting the circumferential length difference between both sides in the width direction of the endless pressure belt wound around the pair of pressure rolls, and controlling so as to eliminate the circumferential length difference,
Prepare a belt circumference adjusting device with a belt circumference adjusting head that advances and retreats with respect to the pressure belt on both sides in the width direction of the pressure belt,
A first step of extending the circumference of the pressure belt by extending the belt circumference adjustment head on the side where the pressure belt is advanced;
Within the set time, the belt circumference adjustment head with the longer pressurization belt extension time is extended by the set stroke, and the belt circumference adjustment head with the shorter pressurization belt extension time is not applied to the pressure belt in the initial stage. The second step of returning to position,
The single facer pressure belt control is characterized by eliminating the belt circumference difference without overloading one side of the pressure belt in the width direction by repeating the second step every set time. Method.   In the second step, when the ratio of the pressure belt extension time within the set time is less than the lower limit set value or exceeds the upper limit set value, the belt circumferential length adjusting head with the longer press belt extension time is adjusted. 4. The single according to claim 3, wherein the belt circumference adjusting head having a shorter pressure belt extension time is returned to an initial position where no load is applied to the pressure belt, while being extended by a set stroke. Method for controlling the pressure belt of the facer.   The method for controlling a pressure belt for a single facer according to claim 2 or 4, wherein the lower limit set value is 0.87 and the upper limit set value is 1.15. In the pressure belt control device of a single facer that detects a circumferential length difference between both sides in the width direction of an endless pressure belt wound around a pair of pressure rolls and controls to eliminate the circumferential length difference,
A pair of pressure cylinders for adjusting the distance between the roll axes on both ends of the pair of pressure rolls;
Compare the first step to increase the distance between the pressure roll axes by applying high pressure to the pressure cylinder on the side where the pressure belt is advanced, and the high pressure load time of both pressure cylinders within the set time. A second step is performed in which the pressure cylinder having the longer load time is returned to the initial set pressure, and the pressure of the pressure cylinder having the shorter high pressure load time is set to a pressure obtained by subtracting a preset pressure value. A single-facer pressurizing belt control device. In the pressure belt control device of a single facer that detects a circumferential length difference between both sides in the width direction of an endless pressure belt wound around a pair of pressure rolls and controls to eliminate the circumferential length difference,
A plurality of belt circumference adjusting devices including belt circumference adjusting heads arranged on both sides in the width direction of the pressure belt and adjusting the circumference of the pressure belt by moving back and forth toward the pressure belt;
The first step of extending the belt circumference adjustment head on the side where the pressure belt is advanced to extend the circumference of the pressure belt, and the set stroke of the belt circumference adjustment head with the longer pressure belt extension time within the set time And a controller for performing a second step of extending the belt circumference adjusting head having a shorter pressure belt extension time to an initial position where no load is applied to the pressure belt. Facer pressure belt control device. A belt circumference adjustment device equipped with a belt circumference adjustment head is provided at the center of the pressure belt in the width direction, and the circumference of the center of the pressure belt in the width direction is adjusted independently of both sides in the width direction. The pressurizing belt control device for a single facer according to claim 6 or 7.

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