JPH0641890A - High pressure feeder controller - Google Patents

Abstract

PURPOSE:To prevent the invasion of a treating solution as much as possible to minimize the consumed power of a high pressure pump and retard the progress of the abrasion of the feeder by maintaining an interval between a rotor and a casing in the best state, the interval being increased in response to the progress of the abrasion. CONSTITUTION:A ratchet wheel 5 is attached to the shaft 2a of a rotor 2. Teeth 5a are formed around the ratchet wheel 5, and tines 6, 7 for rotating the ratchet wheel in the right and left directions respectively, are symmetrically arranged. The tines 6, 7 are selectively driven with air pressure-powered units 8, 9, respectively, to rotate the ratchet wheel 5 in the right or left direction. The air pressure-powered units 8, 9 are controlled to a driving controller 12 controlled with a computer 13. Control signals for the rotation power 14, rotation variation 15, the number rotations 16, axially directed position 17 and surface temperature 18 of a rotor, the volume of a liquid leaked from the interval, the volume of a white solution, an operation stopping program 21, etc., are inputted into the computer 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for keeping an optimum condition of a high pressure feeder for supplying a high pressure fluid to, for example, a continuous cellulose digester.

[0002]

BACKGROUND OF THE INVENTION For example, in the process of making cellulose or pulp, the pressure must be kept constant in order to maintain the cooking temperature of a continuous cellulose digester for cooking wood chips. As shown in FIG. 4, a high-pressure feeder F is generally used to press the mixture of wood chips and cooking liquor into the cellulosic digester D under pressure. As shown in FIG. 5, the high-pressure feeder F is configured so that a tapered rotor 2 is housed in a casing 1 and the rotor 2 is rotationally driven by a rotary drive device 3. The rotor 2 moves in the axial direction A by rotating the handwheel 4 to the right or left, and adjusts the gap amount with the casing 1. The surfaces of the casing 1 and the rotor 2 cannot avoid abrasion due to fine sand adhering to the wood chips over time, and it is strongly desired to keep this abrasion to a minimum.

In the past, in order to keep the wear of the casing 1 and the rotor 2 to a minimum, a clean and lubricative cooking whitening liquid was pressed into the gap to prevent the infiltration of foreign matter such as sand. However, even the above-mentioned conventional method cannot prevent an increase in wear, and the high-pressure cooking liquor in the cellulose digester leaks through the increased gap. Therefore, the leaked cooking liquor is returned to the inside of the high-pressure cellulose digester by the high-pressure pump, but this consumes extra power, and if the amount of leakage increases, the capacity limit of the high-pressure pump will be exceeded. There are problems such as being unable to operate. For this reason, it is necessary to adjust the gap which constantly increases due to wear.

Conventionally, as a method of adjusting the clearance, the handwheel 4 is rotated to move the rotor 2 in the axial direction A. However, this manual gap adjustment is performed depending on the intuition of the site worker, and therefore, the wear of the casing 1 and the rotor 2 is faster than expected, and the adjustment and repair have been forced in a short period of time.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and the purpose thereof is to keep the amount of gap increasing due to wear constantly in the optimum state. Accordingly, it is an object of the present invention to provide a high-pressure feeder control device capable of preventing the inflow of a processing liquid such as a cooking liquid as much as possible, minimizing the consumption power of the high-pressure pump, and delaying the progress of wear. It is another object of the present invention to provide a device that can switch to manual operation immediately and continue operation stably even if the automatic control device should fail.

[0006]

SUMMARY OF THE INVENTION A high-pressure feeder control device of the present invention comprises a ratchet wheel mounted on the rotor shaft of the high-voltage feeder; a ratchet wheel engaging the teeth of the ratchet wheel to move the ratchet wheel to the right and left respectively. Left and right pawls that rotate intermittently to each other; a pneumatic power unit that drives these pawls forward and backward respectively; an air introduction pipe connected to each pneumatic power unit; a drive that supplies compressed air to the air introduction pipe Control device; rotation load of high-pressure feeder in continuous operation, rotation speed of high-pressure feeder, amount of gap between casing and rotor, amount of leakage liquid from casing-rotor gap, amount of lubricating liquid, temperature during operation and at rest A computer that outputs a control signal to the drive control device based on the signal value for maintaining an optimum operating state. And said that you are. The left and right claws are provided in pairs, and the pair of claws are arranged at symmetrical positions with respect to the rotation axis of the ratchet wheel. A manual handle is attached to the rotor shaft. Also,
The computer is provided with a monitor for monitoring the control state.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 and 2, reference numeral 5 denotes a ratchet wheel, which is mounted on the shaft 2a of the rotor 2. Square teeth 5 a are formed around the ratchet wheel 5.

Reference numeral 6 is a claw for right rotation, which is arranged in a pair symmetrically with respect to the rotation axis of the ratchet wheel 5.
Reference numeral 7 is a counterclockwise rotating pawl, and like the pawl 6, a pair of pawls is provided. The pawl 6 is attached to the piston rod 8a of the pneumatic power unit 8, while the pawl 7 is attached to the piston rod 9a of the pneumatic power unit 9. As shown in the enlarged view of FIG.
It is rotatably attached to the piston rod 8a via a. Piston rod 8a by pneumatic power unit 8
When B moves forward in the B direction, the tip surface of the claw 6 pushes the tooth 5a to rotate the ratchet wheel 5 in the arrow C direction. When the piston rod 8a retreats in the direction opposite to the arrow B, the back slope 6b of the pawl 6 slides on the tooth 5a and the pawl 6 is lifted upward, and then the rear tooth 5a can be engaged.
When the pawl 6 is moved forward again, the tooth 5a on the rear side is pushed to rotate the ratchet wheel 5 again. In this way, when the ratchet wheel 5 rotates in the direction of arrow C, the pawl 7 has the teeth 5a.
It is retreating higher. On the contrary, when the ratchet wheel 5 is rotated in the direction opposite to the arrow C, the pneumatic power unit 9 is operated to operate the pawl 7. In this case, the claw 6 is retracted.

An air introducing pipe 10 is connected to the pneumatic power unit 8, and an air introducing pipe 11 is connected to the pneumatic power unit 9. Compressed air controlled by the drive control device 12 is supplied to the air introduction pipes 10 and 11 to drive the pneumatic power units 8 and 9 while controlling them.

The drive control device 12 is a computer 1
Controlled by 3. The computer 13 includes a power amount 14 of rotation of the rotor 2 and its fluctuation amount 15, a rotation speed 16 of the rotor 2, an axial position 17 of the rotor 2, a surface temperature 18 of the rotor 2, the casing 1 and the rotor 2 described above. The amount of leaked liquid 19 from the gap between and, the amount of white liquid 20 as the press-fitted lubricating liquid, the operation stop program 21, and the like are input as signal values. 22 is a monitor display. In case of an emergency such as a failure of the automatic control device, the handwheel 4 is also attached so that it can be controlled manually.

Since the control device of this embodiment is configured as described above, the amount of power 14 for rotation of the rotor 2, the amount of fluctuation 15, the number of revolutions 16, the axial position 17, the surface temperature 1
8, the amount of leaked liquid 19 from the gap, the amount of white liquor 20 being press-fitted, the operation stop program 21, etc. are input to the computer 13 as signal values. The computer 13 analyzes and calculates these signal values to calculate an optimum control value, and sends a control signal to the drive control device 12. The drive control device 12 supplies compressed air to the air introduction pipe 10 or 11 based on a control signal from the computer 13, operates the pneumatic power unit 8 or 9, and operates the pawl 6 or 7. When the pawl 6 operates, the ratchet wheel 5 intermittently rotates to the right (C direction) in FIG. 1 to reduce the gap between the casing 1 and the rotor 2, and conversely, the pawl 7 operates to operate the ratchet wheel. When 5 rotates counterclockwise, the gap becomes larger. For example, when the leaked liquid amount 19 is large, compressed air is introduced from the air introduction pipe 10 to the pneumatic power unit 8 and the claw 6
To reduce the gap. This control state can be constantly monitored by the monitor display 22, and an alarm is issued if necessary.

[00013]

【The invention's effect】

1) By constantly keeping the amount of voids increasing due to wear in the optimum state, it is possible to prevent the processing liquid from entering as much as possible, minimize the power consumption of the high-pressure pump, and delay the progress of wear. 2) The ratchet wheel for controlling the gap between the casing and the rotor can be smoothly and reliably rotated. 3) Even if the automatic control device should fail, it can be switched to manual operation immediately and the operation can be continued stably.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a control device of the present invention.

FIG. 2 is a cross-sectional view taken along the line EE of FIG.

FIG. 3 is an explanatory view of the operation of a ratchet wheel and pawls.

FIG. 4 is a diagram of a continuous cellulose digester.

FIG. 5 is an explanatory diagram of a conventional high pressure feeder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 casing 2 rotor 2a axis 3 rotation drive device 4 handwheel 5 ratchet wheel 5a tooth 6 claw 6a pin 6b slope 7 claw 8 pneumatic power unit 9 pneumatic power unit 10 air introduction pipe 11 air introduction pipe 12 drive controller 13 computer 14 rotor Rotational power 15 Rotor power fluctuation 16 Rotor speed 17 Casing and rotor axial position 18 Rotor surface temperature 19 Leakage 20 White liquor 21 Operation stop program 22 Monitor display A Rotation direction B Rotation Direction C Rotation direction

Claims (4)

[Claims] 1. A ratchet wheel mounted on a rotor shaft of a high-pressure feeder; left and right pawls that engage with teeth of the ratchet wheel to intermittently rotate the ratchet wheel rightward and leftward, respectively. A pneumatic power unit for driving the pawl forward and backward respectively; an air introduction pipe connected to each pneumatic power unit; a drive control device for supplying compressed air to the air introduction pipe; a rotary load of the high-pressure feeder in a continuous operation state Optimum operating condition for the drive controller based on the rotation speed of the high-pressure feeder, the gap between the casing and the rotor, the amount of leakage liquid from the gap between the casing and the rotor, the amount of lubricant, and the signal values of the temperature during operation and at rest. A high-voltage feeder control device, comprising: a computer that outputs a control signal for maintaining the drive control device to the drive control device. 2. The left and right claws are provided in pairs, respectively.
2. The high-voltage feeder control device according to claim 1, wherein each pair of pawls is arranged symmetrically with respect to the rotation axis of the ratchet wheel. 3. The high-voltage feeder control device according to claim 1, wherein a manual handle is attached to the rotor shaft. 4. The high-voltage feeder control device according to claim 1, wherein the computer is provided with a monitor for monitoring a control state.