CN114318925A

CN114318925A - Pulping machine

Info

Publication number: CN114318925A
Application number: CN202111580805.4A
Authority: CN
Inventors: 杨洪伟; 陈飞; 关恒伟; 朱根荣; 孟常晖
Original assignee: Zhejiang Huazhang Technology Co Ltd
Current assignee: Zhejiang Huazhang Technology Co Ltd
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-04-12
Anticipated expiration: 2041-12-22
Also published as: CN114318925B

Abstract

The invention discloses a pulping machine, comprising: the shell is provided with an accommodating cavity, and the shell is provided with a liquid inlet hole and a liquid outlet hole; the fixed knife is arranged in the accommodating cavity and is connected with the shell; the movable cutter is arranged in the accommodating cavity and is matched with the fixed cutter to form a grinding channel; the liquid inlet hole is communicated with the liquid outlet hole through the pulping channel; the rotating mechanism is used for driving the movable cutter to rotate; the moving mechanism is used for driving the movable cutter to be close to or far away from the fixed cutter; the controller is in communication connection with the rotating mechanism and the moving mechanism; and the position sensor is used for detecting the position of the movable cutter in real time and is in communication connection with the controller. The invention realizes the real guarantee of the pulp grinding quality by stabilizing the constant clearance between the movable cutter and the fixed cutter by additionally arranging the position control.

Description

Pulping machine

Technical Field

The invention relates to the technical field of paper pulp processing equipment, in particular to a pulping machine.

Background

With the emphasis of the nation on intelligent manufacturing, low-energy consumption and high-intelligence low-carbon environment-friendly equipment is developed to save the labor cost in the actual production process, improve the production efficiency and reduce the average production energy consumption.

Refiners are essential equipment used in stock preparation plants of paper mills. The pulp fiber passes through the rotor which rotates fast to generate centrifugal action and enters a pulping area which consists of the rotor and the stator, the surfaces of the rotor and the stator are provided with strip-shaped blades, and the fiber moves from the groove of the rotor to the groove of the stator through the clearance of the pulping area. The fiber passes through the gap, and thus, the fiber is cut, pressed, broomed, or fluffed, thereby changing the fiber properties.

Whether the gap between the refining blades remains stable is a determining factor in determining the effect of the fibre treatment. The pulping machine comprises a movable cutter and a fixed cutter, the motor drives the movable cutter to rotate, and the required pulping clearance is realized by realizing the feed through a feed and retreat cutter mechanism. The power of the feed process can be increased, and the motor power or the current value reflected by the approximate sharpening gap is adopted as a parameter to realize control.

In chinese patent application No.: CN201711372781.7 discloses an automatic control system and method for feeding and retracting of a double-disc refiner, which discloses "stopping feeding when the actual power of the main motor collected by a power transmitter is equal to the set power".

The article "control of refiner consistency" describes "refiner constant power control". The linking is as follows:https://www.docin.com/p-831395945.html。

in chinese patent application No.: CN201410631486.9 discloses a conical refiner. The technical scheme does not describe how to manage and control the operation of the moving knife.

In chinese patent application No.: CN201910334018.8 discloses a conical refiner with feed, withdrawal and refining pressure regulated by mechanical and hydraulic linkage. According to the technical scheme, the gap is controlled by adjusting the hand wheel fine adjustment nut, the effect is poor, the adjustment is not in time, and the cutter is easy to hit.

At present, the actual power feedback of the motor adopted by the power control mode is compared with the set power to realize the control of the expected refining gap.

The applicant has found that the actual feedback power does not represent that factors such as actual refining gap, consistency, flow, pressure difference etc. all affect the actual power feedback. After the factors change, the power changes, and the knife sharpening gap to be achieved by the originally set power value changes, so that the precise knife sharpening gap target cannot be achieved by the knife sharpening action during power control. The grinding quality is changed due to unstable grinding clearance, and the grinding tool is easy to collide. In view of this, the present application is proposed.

Disclosure of Invention

In order to solve the technical problem in at least one aspect in the background art, the invention provides a pulping machine which is safe to operate and avoids accidents.

The invention provides a pulping machine, comprising:

the shell is provided with an accommodating cavity, and the shell is provided with a liquid inlet hole and a liquid outlet hole;

the fixed knife is arranged in the accommodating cavity and is connected with the shell;

the movable cutter is arranged in the accommodating cavity and is matched with the fixed cutter to form a grinding channel; the liquid inlet hole is communicated with the liquid outlet hole through the pulping channel;

the rotating mechanism is used for driving the movable cutter to rotate;

the moving mechanism is used for driving the movable cutter to be close to or far away from the fixed cutter;

the controller is in communication connection with the rotating mechanism and the moving mechanism;

and the position sensor is used for detecting the position of the movable cutter in real time and is in communication connection with the controller.

Preferably, the refiner further comprises a travel switch for detecting and feeding back the position state of the movable blade when the movable blade starts to feed, and the travel switch is in communication connection with the controller.

Preferably, the rotating mechanism includes:

a connecting shaft; the first end of the movable blade penetrates through the shell and is connected with the movable blade;

a coupling;

and the first motor is connected with the second end of the connecting shaft through the coupler and is in communication connection with the controller.

Preferably, a water storage cavity is formed between the connecting shaft and the shell in an enclosing manner, and the water storage cavity is positioned on one side of the accommodating cavity; the shell is provided with a water inlet hole and a water outlet hole which are communicated with the water storage cavity.

Preferably, a first sealing ring is arranged at the joint of the connecting shaft and the movable knife.

Preferably, the refiner further comprises a bearing, a bearing seat and a bearing shell, wherein the bearing is arranged in the bearing seat; the bearing seat can move relative to the bearing shell;

the connecting shaft is positioned in the bearing, and an oil storage cavity is formed by the connecting shaft and the bearing seat in a surrounding manner; and the bearing shell is provided with an oil inlet hole and an oil outlet hole which are communicated with the oil storage cavity.

Preferably, the moving mechanism includes:

the nut is connected with the bearing seat;

the screw is in threaded connection with the nut;

and the second motor is in transmission connection with the screw and is in communication connection with the controller.

A method of operating a refiner comprising:

after the pulping machine is installed, the movable cutter is driven to be in contact with the fixed cutter by the moving mechanism, and the position of the movable cutter at the moment is determined to be an initial zero position;

determining that an adjustment zero position is located at the initial zero position;

the moving knife is driven to retract by the moving mechanism at least to a knife retracting position, and the knife retracting position is at least 6mm away from the adjustment zero position;

the rotating mechanism is used for driving the movable knife to rotate;

paper pulp is introduced, and when the movable knife does not exceed the knife withdrawing position, the movable knife is driven to feed by using the moving mechanism;

when the moving blade moves to a fast-slow switching position, the moving mechanism controls the moving blade to be switched from fast feeding to slow feeding, wherein the fast-slow switching position is located between the zero adjusting position and the tool retracting position and is 1.6-2.2mm away from the zero adjusting position;

when the moving blade is fed to the back position of the pulping area from the fast and slow switching position, the moving mechanism controls the moving blade to pulse and inching to feed to the front position of the pulping area to stop feeding; wherein, the back position of the beating area is positioned between the zero adjustment position and the cutter withdrawal position and is 0.3-0.5mm away from the zero adjustment position; the front position of the beating area is positioned between the zero adjustment position and the cutter withdrawal position and is 0.16-0.24mm away from the zero adjustment position; or,

when the moving mechanism controls the moving blade pulse inching feed process, stopping feeding when the actual power P is less than or equal to PS and is less than or equal to 0.99 PS; and the PS is preset power of the rotating mechanism.

Preferably, when the actual power P is greater than the PS; or when the moving blade is fed to the limit position, the moving mechanism controls the moving blade to retract at least to the retracting position;

the limit position is positioned on one side of the zero adjustment position close to the cutter retracting position, and the limit position is 0.08-0.12mm away from the zero adjustment position.

Preferably, when the movable knife is positioned at the front position of the beating area and the actual power P is less than 0.97PS, the zero adjustment position is adjusted by 0.08-0.12mm towards the direction of the fixed knife.

The beneficial effects brought by one aspect of the invention are as follows:

the invention realizes the real guarantee of the pulp grinding quality by stabilizing the constant clearance between the movable cutter and the fixed cutter by additionally arranging the position control. The problem that the constant clearance cannot be ensured due to the fact that power feedback is influenced by factors such as flow, concentration and pressure of slurry in a traditional control mode such as power is solved.

Drawings

FIG. 1 is a top view of the present disclosure;

fig. 2 is a front view of the present disclosure.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments in the present application may be combined with each other; the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left" and "right", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the positions or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus are not to be construed as limitations of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 and 2, the present invention provides a refiner, comprising:

the device comprises a shell 1 and a liquid inlet, wherein the shell 1 is provided with an accommodating cavity 101, and the shell 1 is provided with a liquid inlet hole 103 and a liquid outlet hole 104; a fixed knife 2 arranged in the accommodating cavity 101 and connected with the shell 1; the movable cutter 3 is arranged in the accommodating cavity 101 and is matched with the fixed cutter 2 to form a pulp grinding channel; wherein, the liquid inlet hole 103 is communicated with the liquid outlet hole 104 through the refining channel; the rotating mechanism is used for driving the movable knife 3 to rotate; the moving mechanism is used for driving the movable cutter 3 to be close to or far away from the fixed cutter 2; the controller 14 is in communication connection with the rotating mechanism and the moving mechanism; and the position sensor 4 is used for detecting the position of the movable knife 3 in real time and is in communication connection with the controller 14.

The refiner further comprises a travel switch for detecting and feeding back the position state of the movable blade 3 when the movable blade starts to feed, and the travel switch is in communication connection with the controller 14.

The invention is provided with the position sensor 4 for detecting the position of the moving blade 3 in real time and sending data to the controller 14. The travel switch is additionally arranged, double protection is realized, whether the movable knife 3 is at least in the knife withdrawing position during feeding is detected, and safe feeding is guaranteed. The controller 14 may use the DCS system, and the position sensor 4 and the stroke switch transmit the detected data to the DCS system. The DCS system controls the movement of the moving mechanism and the rotating mechanism.

Further, the rotating mechanism includes:

a connecting shaft 15; the first end of the moving blade penetrates through the shell 1 and is connected with the moving blade 3; a coupling 6; and the first motor 7 is connected with the second end of the connecting shaft 15 through the coupler 6, and the first motor 7 is in communication connection with the controller 14. The first motor 7 is used for driving the shaft coupling 6 and the connecting shaft 15 to rotate, and driving the movable knife 3 to rotate.

Further, a water storage cavity 102 is enclosed between the connecting shaft 15 and the housing 1, and the water storage cavity 102 is located on one side of the accommodating cavity 101; the shell 1 is provided with a water inlet and a water outlet which are communicated with the water storage cavity 102. Water is introduced through the water inlet hole, high pressure is formed in the water storage cavity 102, and pulp in the accommodating cavity 101 is prevented from entering the water storage cavity 102. The connecting shaft 15 can also be cooled.

Furthermore, a first sealing ring is arranged at the joint of the connecting shaft 15 and the movable blade 3. Avoiding leakage.

The refiner also comprises a bearing 8, a bearing seat 9 and a bearing shell 10, wherein the bearing 8 is arranged in the bearing seat 9; the bearing block 9 can move relative to the bearing shell 10; the connecting shaft 15 is positioned in the bearing, and an oil storage cavity is formed by the connecting shaft and the bearing seat 9 in a surrounding manner; and the bearing shell 10 is provided with an oil inlet hole and an oil outlet hole which are communicated with the oil storage cavity.

Further, the moving mechanism includes:

a nut 11 connected with the bearing seat 9; a screw 12 in threaded connection with the nut 11; and the second motor 13 is in transmission connection with the screw 12 and is in communication connection with the controller 14. The second motor 13 is used for driving the screw 12 to rotate, driving the nut 11 to move, and further driving the connecting shaft 15 to horizontally move through the bearing seat 9, so that the moving knife 3 is driven to feed or retract.

A method of operating a refiner comprising:

after the pulping machine is installed, the movable cutter is driven to be in contact with the fixed cutter by the moving mechanism, and the position of the movable cutter at the moment is determined to be an initial zero position; and determining that the adjustment zero point position is located at the initial zero point position.

The moving knife is driven to retract by the moving mechanism at least to a knife retracting position, and the knife retracting position is at least 6mm away from the adjustment zero position; this example is 8 mm. The distance is safe, and stroke waste is avoided.

And the rotating mechanism is utilized to drive the movable knife to rotate.

when the moving blade moves to a fast-slow switching position, the moving mechanism controls the moving blade to be switched from fast feeding to slow feeding, wherein the fast-slow switching position is located between the zero adjusting position and the tool retracting position and is 1.6-2.2mm away from the zero adjusting position; this example is 2 mm.

When the moving blade is fed to the back position of the pulping area from the fast and slow switching position, the moving mechanism controls the moving blade to pulse and inching to feed to the front position of the pulping area to stop feeding; wherein, the back position of the beating area is located between the zero adjustment position and the cutter withdrawal position, and is 0.3-0.5mm away from the zero adjustment position, which is 0.4mm in this embodiment. The front position of the beating area is positioned between the zero adjustment position and the cutter withdrawal position and is 0.16-0.24mm away from the zero adjustment position; in this example, 0.2 mm. Or,

When the actual power P is greater than the PS; or when the moving blade is fed to the limit position, the moving mechanism controls the moving blade to retract at least to the retracting position;

the limit position is located on one side of the zero adjustment position close to the tool retracting position, and the limit position is 0.08-0.12mm, which can be 0.1mm, away from the zero adjustment position.

When the movable cutter is positioned in front of the beating area and the actual power P is less than 0.97PS, the zero adjustment position is adjusted to 0.08-0.12mm, which can be 0.1mm, towards the fixed cutter.

After the new pulping machine is installed, debugging is carried out, the movable cutter is contacted with the fixed cutter, and at the moment, the position of the movable cutter is determined to be an initial zero position. Assume that the position sensor reads 20.13 mm.

Meanwhile, the initial adjustment zero point position is determined to be the initial zero point position. At this time, the adjustment zero position corresponds to a reading of 20.13mm of the position sensor.

After debugging, the moving knife is driven to retract by the moving mechanism at least to the position of retracting the knife. In this embodiment, the distance between the tool retracting position and the zero adjustment position is 8 mm. Thus, the retract position corresponds to a 12.13mm reading of the position sensor.

In the embodiment, the moving knife retreating distance can be far away and exceeds the retreating position. In one embodiment, the reading of the corresponding position sensor after the moving blade push knife is 12.11 mm.

During operation, pulp is introduced. When the movable knife is determined not to exceed the knife withdrawing position, the DCS controls the moving mechanism to drive the movable knife to feed fast, and controls the rotating mechanism to drive the movable knife to rotate.

When the moving knife moves to the fast and slow switching position, the moving mechanism controls the moving knife to be switched from fast feeding to slow feeding. The fast feed and the slow feed in this embodiment refer to different feed speeds, and there is no specific value of the speed.

When the cutter is fed to the rear position of the pulping area, the moving mechanism controls the moving cutter to perform pulse inching to feed the cutter to the front position of the pulping area. When the moving knife is positioned at the rear position of the beating area, the knife needs to be fed carefully, and the pulse inching feeding can be carried out by feeding for 0.05mm each time. After each time of feed, judging whether the cutter moves to the position before the beating area, wherein the actual power P is more than or equal to 0.99PS and less than or equal to PS. When the moving blade moves to the front position of the beating area, or the actual power P is not less than 0.99PS and not more than PS, the feeding is stopped.

Through a plurality of experiments, the actual power P of the rotating mechanism is basically 0.99 PS-PS when the movable knife is positioned in the front position of the beating area. So controlled that a constant refining knife gap is guaranteed.

The power and the position are matched and interlocked for control, and when the actual power P is less than or equal to 0.99PS and less than or equal to PS, the feeding needs to be stopped under the condition. When the moving blade moves to the front position of the beating area, the feeding needs to be stopped no matter what the actual power P is. Therefore, the movable knife can be safely protected from being collided.

In the prior art, the actual power P is compared with PS so as to control the moving blade. In actual conditions, the actual power P may not reach 0.99 × PS even if the moving blade collides with the stationary blade due to a decrease in the pulp flow rate or the like. In the prior art, power control is always adopted, and a person skilled in the art does not know why the power control causes cutter collision and the refining effect is not ideal and does not know the reason. And this application is through power control, position control cooperation, through the position restriction, can in time move back the sword. The movable cutter can be adjusted in time, the constant pulping clearance is ensured, and the condition can be effectively avoided.

When the actual power P is greater than the PS; or when the moving blade is fed to the limit position, the moving mechanism controls the moving blade to retract at least to the retracting position; wherein,

the limit position is located between the zero adjustment position and the tool retracting position, and the limit position is 0.08-0.12mm away from the zero adjustment position, and may be 0.08, 0.09, 0.1, 0.11, 0.12 mm.

The thickness of the present embodiment may be 0.1mm

When the moving blade stops at the front position of the beating area, if an abnormality occurs, such as the pulp concentration is increased, the actual power P is also increased, and when the actual power P is greater than PS, the blade withdrawing treatment is required. When the pulp concentration decreases or the pulp flow rate suddenly decreases. The pressure of the pulp on the movable cutter is reduced, and then the movable cutter can feed a small distance towards the direction of the fixed cutter due to the installation gap of the pulp grinder. However, when the movable blade is in the front position of the beating area, the distance between the movable blade and the fixed blade is originally small, and if the above situation occurs, the blade collision is easily caused. Conventionally, there is no way to avoid such a situation by means of power control.

By setting the limit position, the moving knife is driven to rapidly withdraw by the moving mechanism as long as the moving knife is fed to the limit position, so that knife collision is avoided. And the position control is additionally arranged, so that the accurate clearance control of the movable cutter and the fixed cutter is ensured.

The position control is also carried out on the limit position, the position before the pulping area, the position after the pulping area and the cutter withdrawal position, the moving cutter operation is flexibly adjusted, the pulping effect is ensured, and the safety accident is avoided.

Along with the abrasion of the movable knife, the embodiment can also effectively carry out compensation adjustment.

When the movable cutter is positioned in the front position of the beating area, if the actual power P is always less than 0.97 PS. Therefore, the movable knife is judged to be worn and needs to be adjusted. Then the zero point position is adjusted to the fixed knife direction by 0.08-0.12 mm. In this example, the thickness was adjusted to 0.1mm each time. At this time, the adjustment zero point position was not at the initial zero point position, but was 0.1mm from the initial zero point position. Correspondingly, the limit position, the front position of the beating area, the rear position of the beating area and the cutter withdrawal position are correspondingly adjusted, and the distance between adjacent parts is ensured.

If the moving blade is found to be positioned in front of the beating area again, and the actual power P is always less than 0.97PS, then the adjustment is carried out again. Thus, the grinding quality can be effectively ensured.

Of course, when the distance between the adjustment zero point position and the initial zero point position is greater than a preset value, a prompt is required. At this time, the moving blade is seriously worn and needs to be replaced.

For example, after a period of use, the adjusted zero position corresponds to a reading of 55.50 mm. Correspondingly, the reading corresponding to the limit position is 55.40mm, the reading corresponding to the front position of the beating area is 55.30mm, the reading corresponding to the rear position of the beating area is 55.10mm, and the reading corresponding to the fast and slow switching position is 53.5 mm. The moving knife is positioned in the front position of the beating area and the corresponding reading is 55.30 mm.

The adjustment zero point position is adjusted by an amount of 55.50-20.13-35.37 mm relative to the initial zero point position. I.e. the wear of the moving blade is 35.37 mm. If the preset value is 35.37 mm. When the reading corresponding to the zero position is adjusted to be 55.50, if the actual power P of the movable knife at the back position of the beating area is always less than 0.97PS, a prompt is required at the moment, the movable knife is seriously worn and needs to be replaced.

In the embodiment, the pulp grinding quality is really ensured by stabilizing the gap between the movable cutter and the fixed cutter by additionally arranging the position control. The problem that the constant clearance cannot be ensured due to the fact that power feedback is influenced by factors such as flow, concentration and pressure of slurry in a traditional control mode such as power is solved.

Meanwhile, the problems of rapid abrasion and the like caused by contact of the movable cutter and the fixed cutter in the operation process can be effectively avoided due to position control, the service lives of the movable cutter and the fixed cutter are fundamentally prolonged, the cost investment of a wearing part is reduced, the life cycle of the wearing part is prompted, and the planned shutdown of a factory is facilitated.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A refiner, characterized by comprising:

the rotating mechanism is used for driving the movable cutter to rotate;

2. The refiner of claim 1 further comprising a travel switch for sensing and feeding back the position of the moving blade at the start of the feed, the travel switch being in communication with the controller.

3. A refiner as claimed in claim 1, wherein said rotating mechanism comprises:

a coupling;

4. A refiner as claimed in claim 3, wherein a water storage cavity is formed between the connecting shaft and the casing, and the water storage cavity is positioned at one side of the accommodating cavity; the shell is provided with a water inlet hole and a water outlet hole which are communicated with the water storage cavity.

5. A refiner as claimed in claim 3, wherein a first seal ring is arranged at the connection between the connecting shaft and the movable blade.

6. A refiner as claimed in claim 3, characterized in that the refiner further comprises a bearing, a bearing housing, a bearing shell, the bearing being mounted in the bearing housing; the bearing seat can move relative to the bearing shell;

7. A refiner as claimed in claim 6, wherein said moving mechanism comprises:

the nut is connected with the bearing seat;

the screw is in threaded connection with the nut;

8. A method of operating a refiner, characterized by comprising:

the rotating mechanism is used for driving the movable knife to rotate;

9. The method of claim 8, wherein when the actual power P is greater than the PS; or when the moving blade is fed to the limit position, the moving mechanism controls the moving blade to retract at least to the retracting position;

10. The method according to claim 8, characterized in that when the movable blade is positioned in the front position of the beating area and the actual power P is less than 0.97PS, the zero adjustment position is adjusted to 0.08-0.12mm towards the fixed blade.