JP2009109204A - Blade surface clearance measuring device of disk refiner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade surface clearance measuring device of a disk refiner, which has a simple structure, and surely measures independently of a skill of an operator, by making measurement quantitatively and highly accurately, when measuring a blade surface clearance of grinding blades of the disk refiner. <P>SOLUTION: A target 22 is provided, linking to a sliding disk 6 slidable in the direction of a main shaft 3. A ranging sensor 23 for allowing a laser beam to enter the target 22 and capturing reflected light from the target 22 is provided on an unmovable part of a casing 1 or the like of the disk refiner. A distance to the target 22 is measured by capturing the laser beam irradiated from the ranging sensor 23 and reflected by the target 22 by the ranging sensor 23, and a distance to the sliding disk 6 is determined, and the abrasion amounts of the grinding blades 4a, 5a, 6a are measured. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention mainly relates to a blade surface gap measuring device for measuring a gap between grinding blades of a disc refiner used in a papermaking material beating process in a papermaking material preparation process.

  Papermaking raw materials used in a papermaking machine for making paper are in a state in which pulp fibers are melted in water. In order to produce a good quality paper, it is necessary that the pulp fiber is sufficiently swollen in water and becomes flexible to facilitate inter-fiber bonding. For this reason, a pulp beating process is performed as a pre-stage for use in a paper machine, and a refiner is used for this process. There are various types of refiners, but there are disc refiners with disk-shaped discs with steel blades, and double disc refiners with rotating discs between a pair of fixed discs. There is a final.

  FIG. 3 is a sectional view showing a schematic structure of the double disc refiner. In the grinding chamber 2 inside the casing 1, a rotating disk 4 is arranged so as to be fitted to a rotating main shaft 3, and a rotating side grinding blade 4 a made of steel is mounted on both sides of the rotating disk 4. ing. Fixed side grinding blades 5a and 6a facing each of the rotation side grinding blades 4a are mounted, and a fixed disk 5 and a sliding disk 6 are provided in the casing 1. The sliding disk 6 is slidable in a direction parallel to the axial direction of the main shaft 3, and each of the rotating side grinding blade 4 a and the fixed side grinding blades 5 a, 6 a is slid by sliding of the sliding disk 6. Is adjusted. In the vicinity of the base end portion that is fitted to the main shaft 3 of the rotating disk 4, a communication path 7 that connects both sides of the rotating disk 4 is formed. The main shaft 3 is supported by a bearing 8, and the rotating disk 4 is fitted to the main shaft 3 in a state where movement in the axial direction is allowed.

  The pulp suspension containing the pulp is supplied from the supply pipe 1 a of the casing 1 to the center of the rotating disk 4. The supplied pulp suspension flows from the central part to the outer peripheral part by the rotation of the rotating disk 4. Further, the pulp suspension flows through both sides of the rotating disk 4 through the communication path 7. For this reason, the pressures on both sides of the rotating disk 4 are balanced, and the rotating disk 4 is positioned at an intermediate portion between the fixed disk 5 and the sliding disk 6. The pulp suspension passes through the gap between the fixed grinding blades 5a, 6a and the rotating grinding blade 4a in the middle of flowing to the outer periphery of the rotating disc 4, the stationary disc 5, and the sliding disc 6. The pulp in the pulp suspension will be ground and beaten. The beaten pulp suspension is discharged from the discharge pipe 1b of the casing 1 and fed to the next process.

  By the way, the rotating side grinding blade 4a and the fixed side grinding blades 5a and 6a are worn by grinding and beating the pulp. When these grinding blades 4a, 5a, 6a are worn, the gap dimensions will change, and the grinding conditions will change, so the properties of the beaten pulp will change and the paper quality will be affected. Will be. For this reason, it is necessary to adjust the gaps between the grinding blades 4a, 5a, 6a, and the sliding disk 6 is adjusted by moving along the main shaft 3. As shown in FIG. 2, the sliding disk 6 is moved by connecting the sliding disk 6 to the piston rod 10a of the cylinder / piston mechanism 10 and sliding the piston rod 10a by the operation of the cylinder / piston mechanism 10. It is done by movement.

  Since the gap size of the grinding blades 4a, 5a, 6a affects the state of grinding and affects the paper quality, it is desirable to maintain the gap size at a desired size. For example, in Patent Document 1, grinding blades are provided on both side surfaces of a rotating disk rotatably provided in a grinding chamber surrounded by a casing, and the grinding blades are respectively opposed to the both grinding blades. In a double disc refiner of double-sided beating type, in which a sliding disk and a fixed disk are installed in a pair, or a sliding disk and a fixed disk are installed in pairs, the paper sent to the center of the rotating disk in the grinding chamber When the material is swirled by the rotating disk and passed through the grinding blade gap, it is collected on the outer periphery and discharged out of the grinding chamber. The sliding disk is controlled by a ball screw slider that is screwed onto a screw shaft that is rotated by a servo motor so that the rotating disk is maintained. A papermaking double characterized in that the pressure of the paper flowing toward the disk side and flowing into both sides is hydraulically balanced through the communication path provided on the rotating disk to keep the grinding blade gap on both sides uniform. An operation method in the disc refiner is disclosed.

  According to the operation method disclosed in Patent Document 1, adjustment during operation of the double disc refiner can be performed. On the other hand, when worn over a predetermined amount due to long-time operation, the worn grinding blades 4a, 5a, 6a need to be replaced. When exchanging, it is necessary to grasp the state of wear of these grinding blades 4a, 5a, 6a. The wear status of the grinding blades 4a, 5a, 6a is measured by stopping the operation of the refiner and moving the sliding disk 6 so that the grinding blades 4a, 5a, 6a are in close contact with each other. That is, if the difference between the stop position of the sliding disk 6 when measured in the same manner as the previous time and the stop position of the sliding disk 6 according to the current measurement is obtained, the amount of wear until the current measurement with respect to the previous time can be measured. .

  For example, as shown in FIG. 2, the detection of the amount of wear is linked to the sliding disk 6 to provide a detection rod 11, and the position of the detection rod 11 is performed by a potentiometer 12. That is, the sliding disk 6 is moved to bring the grinding blades 4a, 5a, 6a into close contact, and the position of the detection rod 11 at that time is detected by the output signal of the potentiometer 12. The position of the sliding disk 6 is set as a reference position, and the sliding disk 6 is moved to separate the grinding blades 4a, 5a, 6a, and the gap between them is adjusted. Also, the output signal of the potentiometer 12 when the grinding blades 4a, 5a and 6a are in close contact is recorded, and after the operation for an appropriate time, the potentiometer in the state where the grinding blades 4a, 5a and 6a are in close contact with each other By comparing the output signals of the meter 12, the amount of wear from the previous measurement to the current measurement can be grasped. Therefore, if the output signal of the potentiometer 12 in a state in which the replaced new grinding blades 4a, 5a, and 6a are in close contact with each other is set as the reference position in the initial state, the amount of wear at a desired time can be grasped.

Japanese Patent No. 2811092

  As described above, in the structure in which the position of the detection rod 11 is detected by the potentiometer 12, the failure frequency of the potentiometer 12 is large, and the reliability of the measurement accuracy of the wear amount may be impaired. In addition, the detection rod 11 may be damaged carelessly, and if it is bent, accurate measurement cannot be performed. For this reason, at the operation site, the replacement time of the grinding blades 4a, 5a, 6a is determined by the skill of the worker, and the replacement time is not constant by the worker, even if it is still usable. There is a risk of replacement.

  Therefore, the present invention provides a disk refiner blade surface gap measuring device that can reliably detect the position of a sliding disk and can reliably and easily adjust the gap of a grinding blade. It is intended to provide.

  As a technical means for achieving the above object, a device for measuring a clearance between blade surfaces of a disc refiner according to the present invention comprises a rotating side grinding blade and a fixed side grinding blade attached to a disk surface of a relatively rotating disc. In the disc refiner that causes the liquid to be processed to pass through the gap and grinds the components contained in the liquid to be treated, the target body is provided by being linked to the disk to which the stationary grinding blade is attached, Ranging means for measuring the distance to the target body at the stationary position of the disc refiner without a member contacting the target body is provided at the stationary position.

  That is, the distance to the target body connected to the sliding disk is measured by the non-contact type distance measuring means. Since it is a non-contact type distance measuring means, there is no member such as a detection rod between the distance measuring means and the target body.

  According to a second aspect of the present invention, there is provided a device for measuring a clearance between blade surfaces of a refiner, wherein a laser type distance measuring means is used as the distance measuring means.

  Various methods are known as non-contact type distance measuring means. In the present invention, a laser reflection type distance measuring means is used. The target body is irradiated with a laser beam from a laser emission source, the reflected light is captured, and the distance to the target body is measured.

  According to a third aspect of the present invention, there is provided a device for measuring a clearance between blade surfaces of a disc refiner, wherein the disc refiner includes a fixed disc and a sliding disc at a position sandwiching the rotary disc, The rotating side grinding blade is a double disc refiner in which a stationary side grinding blade is attached to a surface of the stationary disk and sliding disk facing the rotating side grinding blade.

  A disc refiner is a device in which a grinding blade is mounted on the surface of a relatively rotating disc, and the liquid to be treated is passed through the gap between the grinding blades to beat the solids in the liquid to be treated. A single disc refiner and a double (twin) disc refiner are used. All of these require adjustment of the gap between the grinding blades, and the blade surface measuring apparatus of the present invention can be applied to any type of disc refiner. Since a finer is often used, the gap of the grinding blade is measured by detecting the position of the sliding disk of the double disk refiner.

  According to the blade surface clearance measuring apparatus of the disc refiner according to the present invention, since the distance to the target body can be measured by the non-contact type distance measuring means, no member such as a detection rod is required, and damage is caused. There are no parts that could be damaged. For this reason, distance measurement data can always be reliably captured, the reference position in a state in which the grinding blade is in close contact can be reliably captured, and the wear state of the grinding blade can be reliably grasped. Therefore, the grinding blade can be exchanged at an appropriate time regardless of the skill of the worker, etc., and the usage efficiency of the grinding blade can be increased and the economy can be improved.

  Further, according to the device for measuring the gap between the blade surfaces of the disc refiner according to the second aspect of the present invention, the laser beam can be reliably incident on the target body by using the distance measuring means by the laser beam. Distance, that is, the position of the sliding disk can be detected. For this reason, it can be set as the measuring apparatus especially advantageous for measuring the clearance gap of a fine grinding blade.

  According to the disc refiner blade surface gap measuring device according to the invention of claim 3, by applying to a double disc refiner, a measuring device particularly suitable for a paper making process using this type of disc refiner, can do.

  Hereinafter, based on the preferred embodiment shown in the drawings, the blade surface clearance measuring apparatus for a disc refiner according to the present invention will be described in detail. In addition, the same code | symbol is attached | subjected about the site | part same as the site | part shown in FIG. 2 referred in description of the conventional measuring apparatus.

  A target 22 which is a target body is provided on the back surface of the sliding disk 6 via an appropriate bracket 21. The front surface 22a of the target 22 is directed to the outside of the disc refiner, and it is preferable that the target 22 be a reflecting surface capable of reflecting light rays satisfactorily. A laser-type reflection type distance measuring sensor 23 is disposed as a distance measuring means for making a laser beam incident on the front surface 22a of the target 22 and capturing the reflected light beam. The distance measuring sensor 23 is provided in a stationary part such as the casing 1 of the disc refiner with a bracket or the like interposed as necessary, and the position of the distance measuring sensor 23 becomes a fixed point.

  In order to measure the amount of wear of the grinding blades 4a, 5a, 6a, the sliding disk 6 is slid to bring the grinding blades 4a, 5a, 6a into close contact. In this state, the distance sensor 23 measures the distance to the target 22. If the distance measurement data at this time is compared with the distance measurement data measured in the same manner as the previous time, the amount of wear of the grinding blades 4a, 5a, 6a until the current measurement can be grasped. The grinding blades 4a, 5a, and 6a may be replaced as necessary based on the amount of wear.

  Further, the position of the sliding disk 6 in a state where the grinding blades 4a, 5a, 6a are in close contact, that is, the position measured by the distance measuring sensor 23 is set as a reference position, and the grinding blades 4a, 5a, 6a are separated from each other. If the sliding disk 6 is moved in the direction and the moving length is measured, the gaps between the grinding blades 4a, 5a and 6a can be measured. Therefore, the gap between the grinding blades 4a, 5a, 6a can be adjusted by adjusting the moving length of the sliding disk 6.

  In the embodiment described above, the double disc refiner is exemplified as the disc refiner suitable for the paper making process. However, even a single disc refiner can be used. In these disc refiners, since the grinding blade is made of steel, it is necessary to replace the grinding blade that has been worn by the beating action, and to adjust the gap. It is advantageous to use this disc refiner blade surface gap measuring device which can easily perform measurement and adjustment of the gap.

  According to the device for measuring the blade gap of the disc refiner according to the present invention, the number of members that are necessary for measurement and may be damaged is reduced as much as possible, so that highly accurate measurement can be performed stably and quantitatively. Since measurement can be performed, it is possible to grasp the replacement timing of the grinding blade regardless of the skill of the operator, and contribute to the improvement of the operation efficiency and economic efficiency of the disc refiner.

1 is a partial cross-sectional view of a double disc refiner provided with a blade surface gap measuring device according to the present invention. FIG. 2 is a partial cross-sectional view of a double disc refiner provided with a conventional blade surface gap measuring device, corresponding to FIG. 1. It is a schematic sectional drawing explaining the structure of a double disc refiner.

Explanation of symbols

1 Casing 2 Grinding chamber 3 Spindle 4 Rotating disc
4a Rotating side grinding blade 5 Fixed disk
5a Fixed side grinding blade 6 Sliding disc
6a Fixed side grinding blade
21 Bracket
22 Target
23 Distance sensor (ranging means)

Claims (3)

A disc that causes a liquid to be treated to pass through a gap between a rotating side grinding blade and a stationary side grinding blade that is attached to the surface of a disk that rotates relatively, and grinds the components contained in the liquid to be treated. In the refiner,
Provide a target body linked to the disk to which the fixed grinding blade is attached,
A disc refiner comprising: a distance measuring means for measuring a distance to the target body at the stationary position of the disc refiner without having a member in contact with the target body. Blade clearance measurement device.   2. The apparatus according to claim 1, wherein a laser type distance measuring means is used as the distance measuring means.   The disk refiner includes a fixed disk and a sliding disk at a position between which the rotating disk is sandwiched, and the rotating side grinding blades are provided on both sides of the rotating side disk, and the rotating side grinding of the fixed disk and the sliding disk. The blade surface gap measuring device for a disc refiner according to claim 1 or 2, wherein the device is a double disc refiner in which a fixed-side grinding blade is attached to the surface of the disc facing the blade.

Images