JP2811092B2 - Operation method in double disc refiner for papermaking - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is to beat a raw material of various stock materials in a grinding machine with a rotating disk having grinding blades on both sides in a grinding chamber to produce high quality fibers. The present invention relates to an operation method for automatically adjusting a gap between grinding blades with a double disc refiner and performing grinding processing.

[Conventional technology]

In general, it is known that refining is performed by beating raw material or the like between grinding surfaces of a fixed disk and a sliding disk to produce high-quality fibers. As a device for adjusting the beating force, a device in which a movable grinding blade is slid by a hydraulic cylinder or a pneumatic cylinder and controlled is proposed.

That is, in this refiner, as described in Japanese Utility Model Publication No. 48-6722, the grinding blade of the sliding disk is elastically pressurized and gradually extruded according to the continuous attrition due to grinding of each disk. The system is operated by an automatic load adjustment system using hydraulic or pneumatic pressure so that the grinding gap is prevented from changing and constant beating is performed at all times.

[Problems to be solved by the invention]

However, it is difficult to accurately set the position of the grinding blade gap by the hydraulic or pneumatic cylinder drive according to the conventional operation method, and the gap maintenance is unstable. On the other hand, even if a gear system that uses a combination of a worm gear and a square screw is adopted as the sliding disk movement transmission mechanism for accurate position setting, there is a problem in that the backlash on the mechanism causes poor control responsiveness due to slack. It is difficult to operate refining of stocks with different properties depending on various items such as raw material processing amount, raw material type, concentration, beating blade shape, and beating conditions under ideal conditions. Was.

Further, in the double disc refiner method, it cannot be said that the gaps between the grinding blades on both sides of the rotating disc are always kept uniformly.

In the present invention, these conventional drawbacks are intended to be eliminated accurately, the refining operation can be controlled well at all times, the position setting of the beating blade is maintained accurately, and the raw material can be produced under ideal conditions with good quality. Fiber can be used, and the refiner can be operated with high responsiveness without backlash even when the relative relationship between the grinding blade gap and the load fluctuates, enabling highly safe operation that can greatly improve the efficiency of beating work. Method.

[Means for solving the problem]

According to the present invention, a grinding disk is provided on both sides of a rotating disk rotatably provided in a grinding chamber surrounded by a casing, and a grinding blade is provided opposite to both grinding blades. In a double-sided beating type double disc refiner with a moving disc or a sliding disc and a fixed disc facing each other, the stock fed to the center of the rotating disc in the grinding chamber is rotated by the rotating disc. While being beaten through the crushing blade gap, the sliding disc is slid in the axial direction with respect to the rotating disc to be kept at a constant pressure constant gap by being slid in the axial direction with respect to the rotating disc when being collected at the outer periphery and discharged outside the grinding chamber. Is controlled by a ball screw slider screwed onto a screw shaft rotated by a servomotor, and the rotating disk pressed by the sliding disk is moved to the fixed disk side and the paper flowing into both sides is moved. The pressure is a driving method in a papermaking double disc refiner, characterized in that via the communication passage provided in the rotating disk hydraulically by balancing holds equally both sides of the grinding Saiha gap with.

[Operation] In this papermaking refiner, A / D converter that inputs beating conditions such as raw material processing amount, raw material type, raw material concentration, blade gap, and load as analog signals and converts them into digital signals
The data processing unit including the converter and the D / A converter compares the internal fixed data with the input data, controls the servomotor that drives the sliding disk, and slides the sliding disk axially with respect to the rotating disk. The sliding disk is moved by a ball screw slider screwed onto a screw shaft rotated by a servomotor so as to maintain a constant pressure and a constant gap while moving, and the rotating disk pressed by the sliding disk is fixed to the fixed disk. The material pressure flowing toward both sides is hydraulically balanced through a communication passage provided in the rotating disk to maintain the grinding blade gap on both sides evenly, so that the positioning of the grinding blade is appropriate. The beating operation can be performed reliably and under ideal conditions, and the internal condition of the refiner can always be operated in a stable state, and the control response is good and the beating operation can be performed safely. That.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2 using a double disk refiner as an example. A rotating disk 3 rotatably provided in a grinding chamber 2 surrounded by a casing 1 is described.
Grinding blades 4 are provided on both side surfaces of the sliding disk 6. A sliding disk 6 provided with grinding blades 5 is opposed to the grinding blades 4, or a sliding disk 6 and a fixed disk 6 are provided. A double-side refining type double disc refiner opposite to _{1 above} , wherein the stock fed to the central portion of the rotating disk 3 in the grinding chamber 2 is beaten through the grinding blade gap while rotating with the rotating disk 3 The sliding disk 6 is servo-controlled so that the sliding disk 6 is slid in the axial direction with respect to the rotating disk 3 and is maintained at a constant pressure and constant gap when being collected at the outer periphery and discharged out of the grinding chamber 2. while movement control by the slider portion 18 of the ball screw to be screwed onto the screw shaft 17 to rotate via the reduction gear 19 by the motor 20, asked the rotary disc 3 is pressed against the sliding disc 6 in the fixed disc ₆₁ side The pressure of the stock flowing into both sides is Through the communication passage 8 hydraulically to balance being configured to uniformly hold the both sides of the grinding cracking blades gap provided in the disk.

Incidentally, the grinding is to supply the paper stock into砕室2 of single stock infeed pipe 7 of one which is defined by the rotary disk 3 is provided in the casing 1 and the fixed disc 6 ₁ chamber 2 ₁ It opened at and communicated to the central portion, and communicates with the chamber 2 ₂ on the other side partitioned by the rotary disc 3 and the sliding disc 6 in the communication passage 8 penetrating the chamber 2 ₁ to the disc side surfaces, whereas the side surface, That it is consecutively provided a delivery pipe 10 to form a delivery port 9 to offset the chamber located in the fixed disk ₆₁ side.

The rotating shaft 13 of the rotating disk 3 is connected to a main motor 15 of a prime mover via a coupling 14 and is supported by a bearing 16 so as to be driven to rotate. The sliding disk 6 is a pair of rotating disks. It has sliders 18, 18 which are screwed to the feed screw shaft 17 and move in the axial direction.
Is connected so as to be rotatable by a servomotor 20 via a speed reducer 19, for example, a cyclo-speed reducer, and moves the slider 18 on the screw shaft 17 so that the grinding blade 5 of the sliding disk 6 is moved.
The grinding gap can be adjusted in units of 0.01 to 0.1 mm by adjusting the pressing force.

Then, the servo motors 20 and 20 are communicated via a servo amplifier 21 to a computer unit 22 of a data processing unit. A control circuit is configured by being connected to a power meter 24 and a display unit 25 provided in the circuit, and includes a raw material processing amount, a raw material type, a raw material concentration,
A / D converter and D that input data of beating conditions such as blade clearance and load as analog signals and convert them into digital signals
The computer unit 22 including the A / A converter compares the internal fixed data with the input data to control the servo motor 20 for driving the sliding disk 6, moves at a high speed toward the set pressure point, and While maintaining the blade clearance,
The operation is performed while digitally displaying the gap on the display unit 25 continuously.

In the figure, 26 is a joint portion, and 27 is a bearing housing, which also serves as an attachment member. 27 ₁ is a bearing, 28 is a ball screw, 29 is a connecting rod provided on the slider 18 and connected to the sliding disk 6. 30 is a guide slot.

In the specific example shown in FIG. 3, the sliding disk 6 is slidably fitted to the inner peripheral wall of the casing 1 and has a tapered surface 11 having a conical inner peripheral surface and is formed at the outlet 9 of the casing 1. It is designed to balance the discharge pressure on both sides of the rotating disk 3 along the slope 12, and has a sliding leg 34 provided below the sliding disk 6 on the rail 35 as an anti-spin structure. is there.

Incidentally, the lid portion 1 ₁ of the sliding disk 6 side is considered so be opened and closed by a cylinder 33 for driving and attaching a rod 32 through a stay 31.

In the example of FIG. 4, the slider 18 of the ball screw 28 is connected to the sliding disk 6 by a pair of connecting rods 29, 29.
A single screw shaft 17, a speed reducer 19, and a drive machine of a servomotor 20 can be operated with good responsiveness without backlash.

The servomotor 20 may be provided with a potentiometer if necessary, and may be replaced with a pulse motor or a sliding mechanism including the screw shaft 17 may be replaced with a linear motor. In addition, the display unit 25 is digitally displayed numerically, but may be a type using an alarm lamp or a buzzer together. The rotary disk 6 may be of a single type, and the grinding blades 5 may be used with sufficient application to a refiner having both movable grinding blades.

In any case, the main frame including the casing 1 is configured to be able to be divided into a pair of a motor side and a cylinder side,
Both are provided with bearings for supporting bearings at both ends of the main shaft. Further, the rotating disk 3 and the rotating shaft 13 are precisely integrated, the liquid contact portion of the shaft is entirely protected by a corrosion-resistant material, and the sliding portion of the gland packing is fitted with a sleeve whose surface has been subjected to abrasion resistance. The drive coupling that connects the machine to the main motor uses a roller coupling that uses rolling contact so as not to lose the function of the floating rotating disk 3.

Further, grinding at砕室2, the rotary disc 3 is pressed against the sliding disc 6 is provided by, the fixed disc 6 ₁ side naturally feed pressure and the water flowing through and the communication passage 8 from this time on both sides It balances mechanically and tries to stop at the center of both grinding blades 5,5, the blade gap on both sides of the rotating disk 3 is kept equal, and the size is inversely proportional to the beating thrust, so the beating work is adjusted by the beating thrust. The power and the blade clearance can be freely selected only by using the power, and can always be kept constant.

〔The invention's effect〕

The present invention provides a ball screw slider that is screwed onto a screw shaft that rotates a sliding disk with a servomotor so that the sliding disk is axially slid with respect to the rotating disk to maintain a constant pressure and a constant gap. In addition to controlling the movement, the rotating disc pressed by the sliding disc is moved toward the fixed disc side, and the stock pressure flowing into both sides is hydraulically balanced through a communication passage provided in the rotating disc, thereby polishing both sides. By maintaining the crushing blade gap evenly, the grinding blade gap is constantly adjusted to ideal conditions and refining work can be performed, that is, the sliding disk is axially controlled by the ball screw slider and both sides of the rotating disk The beating thrust applied to the plate is easily balanced, and the blade gap between the plates on both sides is naturally and evenly matched with the movement of the rotating disk that can move freely in the axial direction. It is possible to always beat the constant pressure and constant gap, and the drive by the servo motor is transmitted to the movable grinding blade without backlash, and a refiner with good responsiveness to fluctuations in the relative relationship between the grinding blade gap and load It can guarantee stable operation that can control the operation and greatly improve the efficiency of beating and grinding work, has extremely high reliability, is easy to handle, and can easily and quickly perform the man-hours required for changing setting conditions It is.

[Brief description of the drawings]

FIG. 1 is a system explanatory view showing an embodiment of the present invention, FIG. 2 is a partially enlarged longitudinal sectional view, FIGS. 3 and 4 are longitudinal sectional views of other embodiments, respectively, and FIG. It is a longitudinal section of an example. DESCRIPTION OF SYMBOLS 1 ... Casing, 2 ... Grinding room, 2 ₁ , 2 ₂ ... Chamber, 3 ... Rotating disk, 4 ... Grinding blade, 5 ... Grinding blade, 6 ... Sliding disk, 6 ₁ …… Fixed disk, 7 ……
Inlet piping, 8 communication passage, 9 outlet, 11 outlet piping, 13 rotating shaft, 15 main motor, 17 screw shaft, 18 slider, 19 reduction gear , 20 ... servo motor, 22 ... computer unit.

Claims (1)

(57) [Claims] 1. A grinding disk is provided on both sides of a rotating disk rotatably provided in a grinding chamber surrounded by a casing, and grinding blades are respectively provided opposite to both grinding blades. In a double-sided beating type double disc refiner with a sliding disk and a fixed disk, or a sliding disk and a fixed disk, the stock fed to the center of the rotating disk in the grinding chamber is rotated. While rotating and refining through the grinding blade gap while rotating with the disc, the sliding disc is axially slid with respect to the rotating disc when collected at the outer periphery and discharged outside the grinding chamber so as to maintain a constant pressure and constant gap. The movement of the sliding disk is controlled by a slider of a ball screw screwed onto a screw shaft rotated by a servomotor, and the rotating disk pressed by the sliding disk is moved toward the fixed disk. Operation in a double disc refiner for papermaking, characterized in that the stock pressure flowing into both sides is hydraulically balanced through a communication passage provided in a rotating disc to uniformly maintain the gap between the grinding blades on both sides. Method.