CN201512717U - Medium Consistency Disc Mill Fine-tuning Control System - Google Patents

Abstract

The utility model provides a fine-tuning control system for a medium-consistency disc mill. The system includes a temperature monitoring module, an equipment operation monitoring module, and a beating quality control module, a current detection module, a displacement control module, a fine-tuning servo control module, and a knife advance and retreat control module connected in sequence. module, the output end of the temperature monitoring module is respectively connected with the equipment operation monitoring module and the advance and retreat knife control module, and the output end of the advance and retreat knife control module is respectively connected with the hydraulic device and the end face transmission device of the disc grinder. The utility model realizes the automatic control of the beating of the disc refiner, reduces the manual operation, improves the adjustment accuracy of the distance between the grinding plate components, and also improves the beating quality and beating efficiency.

Description

Medium Consistency Disc Mill Fine-tuning Control System

technical field

The utility model relates to the technical field of disc mills, in particular to a fine-tuning control system for medium-concentration disc mills.

Background technique

The disc refiner is the main equipment for pulp beating in the paper industry. The main beating processes of the existing disc refiner include low-consistency beating, medium-consistency beating and high-consistency beating. Usually, the beating concentration of low-consistency beating is about 3-4%. The beating concentration of medium-concentration beating is between 6 and 15%, and the beating concentration of high-concentration beating is more than 20%. Due to the difference in slurry concentration, the flow characteristics of the slurry will change fundamentally, so the beating process control There are also different requirements for the control of disc mill equipment.

At present, the traditional low-consistency beating process is still used more in papermaking enterprises, and more beating equipment is double-disk mill. Due to the long use time, rich experience in use, and increasingly perfect control technology, low-consistency beating has a great impact on fiber cutting. more. Existing research and production practices have shown that medium-consistency beating can better protect the fiber length, and at the same time achieve the beating functions such as fiber separation and brooming with high efficiency, thereby greatly reducing the energy consumption of beating. Therefore, the more More and more papermaking enterprises have begun to adopt medium-consistency beating technology and medium-consistency beating equipment. However, the existing medium-consistency beating has not yet realized automatic control, and the control of its process and the control of the working state of the equipment are mainly completed by manual operation, especially the distance between the grinding discs on the disc mill, which can only be adjusted by manual operation. , which requires operators to have rich operating experience, and the paper industry is a large-scale production enterprise, relying only on manual operations often leads to unstable production, great fluctuations in product quality, and waste of electric energy. In serious cases Under the circumstances, normal production cannot even be carried out.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a fine-tuning control system for medium-consistency disc mills with stable production, high adjustment precision of the distance between grinding discs and good beating effect.

The utility model is realized through the following technical solutions: a fine-tuning control system for a medium-consistency disc mill, including a temperature monitoring module, an equipment operation monitoring module, a beating quality control module, a current detection module, a displacement control module, a fine-tuning servo control module and an advance and retreat knife Control module, wherein the input end of the temperature monitoring module is connected with an external temperature sensor, the output end of the temperature monitoring module is respectively connected with the equipment operation monitoring module and the advance and retreat knife control module, the beating quality control module, the current detection module, the displacement control module, and the fine-tuning servo control module It is connected with the advance and retreat control module in sequence, and the output end of the advance and retreat control module is respectively connected with the hydraulic device and the end surface transmission device of the disc grinder; the input end of the displacement control module is also connected with an external position sensor, and the input end of the current detection module is also connected with an external current sensor.

The end face transmission device includes a chuck, an end face screw, a bevel gear and a motor, wherein the chuck is installed on the main shaft of the disc mill connected with the grinding disc assembly, the end face screw is arranged inside the chuck, and the bevel gear is arranged on the chuck The side of the disk is connected with the threaded part of the end face, and the motor arranged at the end of the bevel gear is connected with the control module of the advance and retreat knife of the fine-tuning control system.

The chuck includes a chuck base and a wedge-shaped claw card arranged on the chuck base; the end thread of the end screw is a spiral line; the grinding disc assembly includes a moving and static grinding discs.

The temperature sensor is set on the main shaft bearing of the disc grinder, the position sensor is set on the moving or static grinding disc of the disc grinder, and the current sensor is set on the bearing seat.

The fine-tuning control system can adopt PLC control system or DCS control system.

When the medium-consistency disc mill fine-tuning control system of the utility model is in use, the temperature monitoring module detects the temperature of the main shaft bearing of the disc mill during the whole fine-tuning process to ensure that the temperature is within the normal working temperature range of the bearing to realize the protection of the system; The working current of the mill is set in the beating quality control module, and then the current monitoring module detects the real-time current value and compares it with the set value, and sends the difference between the two to the displacement control module to realize the adjustment of the gap between the grinding discs of the disc mill , so that the work of the disc mill reaches the set value; the fine-tuning servo control module combines the data obtained by the displacement control module and the current detection module to perform calculations, and sends the calculation results to the advance and retreat knife control module, which controls the hydraulic device And the action of the end face transmission device, so as to realize the adjustment of the distance between the moving grinding disc and the static grinding disc.

According to the above system, a fine-tuning control method for a medium-consistency disc mill can be realized, including the following steps:

(1) Start the system, and the temperature monitoring module starts to detect the bearing temperature on the main shaft of the disc mill in real time, and transmits the data to the equipment operation monitoring module, and monitors the working process of the disc mill through the equipment operation monitoring module;

(2) respectively input the target current value of the disk refiner and the target distance value between the movable grinding disc and the static grinding disc, the target current value is recorded and saved by the beating quality control module, and the target distance value is recorded and saved by the fine-tuning servo control module;

(3) The current detection module collects the working current of the disc mill in real time, then compares the obtained real-time working current value with the target current value, and sends the difference between the two to the displacement control module. The distance between the static grinding discs, and then the obtained initial distance value is sent to the fine-tuning servo control module;

(4) The fine-tuning servo control module calculates the axial displacement of the movable grinding disc of the disc mill and sends it to the advance and retreat knife control module;

(5) The advance and retreat knife control module calculates the switching direction and switching time of the solenoid valve of the hydraulic device and the motor speed of the end face transmission device, and then controls the main shaft of the disc grinder to drive the grinding disc to move axially.

The monitoring of the bearing temperature by the temperature monitoring module in step (1) is realized through a temperature sensor arranged on the main shaft bearing of the disc mill; when the detected real-time temperature is within the normal working temperature range of the disc mill, the system operates normally; When the detected real-time temperature exceeds the normal working temperature range of the disc mill, the equipment operation monitoring module will control the system to give an alarm, control the stop of the disc mill or control the cooling device of the disc mill to directly cool down.

The current detection module in step (3) detects the real-time working current value of the disc mill through a current sensor; the displacement control module detects the initial distance value through a position sensor.

The calculation of the axial displacement of the movable grinding disc by the fine-tuning servo control module described in step (4) is as follows:

Use the encoder to record the number of rotations of the motor shaft, and then look up the table to obtain the distance between the dynamic and static grinding discs corresponding to the number of rotations of the motor shaft, and then subtract the obtained distance between the dynamic and static grinding discs from the initial spacing value to obtain the axial displacement of the moving grinding disc .

Described step (5) is specifically:

(5-1) The advance and retreat knife control module calculates the switching direction and switching time of the electromagnetic valve in the hydraulic device of the disc grinder according to the obtained axial displacement of the movable grinding disc, and simultaneously calculates the motor revolution number of the end face transmission device;

(5-2) The advance and retreat knife control module controls the switch of the electromagnetic valve in the hydraulic device to drive the piston movement of the oil cylinder, and at the same time controls the rotation of the motor to drive the wedge-shaped claw movement of the end face transmission device;

(5-3) The movement of the oil cylinder piston and the rotation of the motor simultaneously drive the axial movement of the main shaft of the disc mill to realize the axial displacement of the movable grinding disc.

Compared with the prior art, the utility model has the following beneficial effects:

1. The fine-tuning control system of the medium-consistency disc refiner of the present invention realizes the automatic control of the beating of the disc refiner, changes the situation that the existing medium-consistency disc refiner can only be manually operated, reduces manual operation, and improves the beating efficiency of the disc refiner. The adjustment accuracy of the distance between the grinding discs in the machine makes the beating process stable, improves the beating quality, and greatly improves the beating efficiency.

2. The fine-tuning control system of the medium-consistency disc mill of the utility model realizes the automatic adjustment of the distance between the grinding discs and the automatic adjustment of the working current of the system during the beating process, so that the electric energy can be optimally distributed and the waste of electric energy can be reduced , can achieve about 5% energy saving.

3. The fine-tuning control system of the medium-consistency disc mill of the present invention is equipped with a temperature monitoring module, which can detect the temperature of the main shaft bearing of the disc mill in real time during the operation of the system to ensure the normal operation of the system and improve the self-protection performance of the system .

Description of drawings

Fig. 1 is a structural schematic diagram of the connection of various modules inside the control system of the present invention.

Fig. 2 is a schematic diagram of the structure of the control system of the present invention installed on the disc refiner.

Fig. 3 is a schematic diagram of the structure of the end surface screw device on the disc grinder of the present invention.

Fig. 4 is a schematic structural view of an end face screw device without a motor in the utility model.

FIG. 5 is a cross-sectional view of the device structure in FIG. 4 .

Detailed ways

The utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Example

In this embodiment, a fine-tuning control system for a medium-consistency disc mill, as shown in Figure 1, includes a temperature monitoring module, an equipment operation monitoring module, a beating quality control module, a current detection module, a displacement control module, a fine-tuning servo control module, and an advancing and retreating knife Control module, wherein the input end of the temperature monitoring module is connected with an external temperature sensor, the output end of the temperature monitoring module is respectively connected with the equipment operation monitoring module and the advance and retreat knife control module, the beating quality control module, the current detection module, the displacement control module, and the fine-tuning servo control module It is connected with the advance and retreat control module in sequence, and the output end of the advance and retreat control module is respectively connected with the hydraulic device and the end surface transmission device of the disc grinder; the input end of the displacement control module is also connected with an external position sensor, and the input end of the current detection module is also connected with an external current sensor. When the system is installed on a disc mill, its structure is shown in Figure 2.

In the above system, the end transmission device is shown in Figure 3, including chuck 1, end screw 2, bevel gear 3 and motor 4; On the main shaft 5 of the machine; as shown in Figure 5, the end screw 2 is arranged inside the chuck 1, the bevel gear 3 is arranged on the side of the chuck 1 and is connected with the end screw 2, and the motor at the end of the bevel gear 3 4. Connect with the advance and retreat knife control module of the fine-tuning control system. As shown in Figure 4, the chuck 1 includes a chuck base 6 and a wedge-shaped claw card 7 located on the chuck base 6, and the end thread of the end screw 2 is a spiral line; The movable grinding disc 8 and the static grinding disc 9 on the disc grinder main shaft.

The temperature sensor is arranged on the bearing 10 of the main shaft 5 of the disc mill, the position sensor is arranged on the moving disc 8 or the static disc 9 of the disc mill, and the current sensor is arranged on the bearing seat of the bearing 10; the fine-tuning control system of the present embodiment can be Adopt PLC control system or DCS control system.

When the medium-consistency disc mill fine-tuning control system of this embodiment is in use, the temperature monitoring module detects the temperature of the main shaft bearing 10 of the disc mill during the entire fine-tuning process to ensure that the temperature is within the normal operating temperature range of the bearing to protect the system; The working current of the disc refiner is set in the beating quality control module, and then the current monitoring module detects the real-time current value and compares it with the set value, and sends the difference between the two to the displacement control module, so as to realize the adjustment of the grinding plate gap of the disc refiner. adjustment, so that the work of the disc mill reaches the set value; the fine-tuning servo control module combines the data obtained by the displacement control module and the current detection module to perform calculations, and sends the calculation results to the advance and retreat knife control module, which controls the hydraulic pressure The device and the end face transmission device act to realize the adjustment of the distance between the moving grinding disc and the static grinding disc.

According to the above system, a fine-tuning control method for a medium-concentration disc mill can be realized, as shown in Figure 2, including the following steps:

(1) Start the system, and the temperature monitoring module starts to detect the temperature of the bearing 10 on the disc mill main shaft 5 in real time, and sends the data to the equipment operation monitoring module, and monitors the working process of the disc mill through the equipment operation monitoring module;

(2) respectively input the target current value of the disk refiner and the target distance value between the movable grinding disc and the static grinding disc, the target current value is recorded and saved by the beating quality control module, and the target distance value is recorded and saved by the fine-tuning servo control module;

(3) The current detection module collects the working current of the disc mill in real time, then compares the obtained real-time working current value with the target current value, and sends the difference between the two to the displacement control module, and the displacement control module starts to detect the movable grinding disc 8 at the same time and the spacing between the static grinding disc 9, then the initial spacing value obtained is sent to the fine-tuning servo control module;

(4) The fine-tuning servo control module calculates the axial displacement of the movable grinding disc 9 of the disc mill and sends it to the advance and retreat knife control module;

(5) The advance and retreat knife control module calculates the switching direction and switching time of the solenoid valve 11 of the hydraulic device and the speed of the motor 4 of the end face transmission device, and then controls the main shaft 5 of the disc mill to drive the movable grinding disc 8 to move axially.

In step (1), the temperature monitoring module monitors the bearing temperature through the temperature sensor installed on the main shaft bearing of the disc mill; when the detected real-time temperature is within the normal working temperature range of the disc mill, the system operates normally; when the detected When the detected real-time temperature exceeds the normal working temperature range of the disc mill, the equipment operation monitoring module control system will alarm, control the stop of the disc mill or control the cooling device of the disc mill to directly cool down.

In step (3), the current detection module detects the real-time working current value of the disc mill through the current sensor; the displacement control module detects the initial distance value through the position sensor.

In step (4), the calculation of the axial displacement of the moving grinding disc 8 by the fine-tuning servo control module is specifically as follows:

Use the encoder to record the number of rotations of the motor shaft, and then look up the table to obtain the distance between the dynamic and static grinding discs corresponding to the number of rotations of the motor shaft, and then subtract the obtained distance between the dynamic and static grinding discs from the initial spacing value to obtain the axial displacement of the moving grinding disc .

Step (5) is specifically:

(5-1) The advancing and retreating knife control module calculates the switching direction and switching time of the electromagnetic valve 11 in the disc mill hydraulic device according to the obtained axial displacement of the movable grinding disc 8, and simultaneously calculates the rotating speed of the motor 4 of the end face transmission device;

(5-2) The advance and retreat knife control module controls the switch of the electromagnetic valve 8 in the hydraulic device to drive the piston movement of the oil cylinder 12, and at the same time controls the rotation of the motor 4 to drive the movement of the wedge claw card 7 of the end face transmission device;

(5-3) The movement of the piston in the oil cylinder 12 and the rotation of the motor 4 simultaneously drive the axial movement of the main shaft 5 of the disc mill to realize the axial displacement of the movable grinding disc 8 .

As mentioned above, the utility model can be better realized, and the above-described embodiment is only a preferred embodiment of the utility model, and is not used to limit the scope of implementation of the utility model; that is, all equal changes made according to the contents of the utility model and modifications are all covered by the scope of protection required by the claims of the present utility model.

Claims (5)

1. dense disc mill fine setting control system in, it is characterized in that, comprise the monitoring temperature module, equipment operation monitoring module, the refining pulp quality control module, current detection module, the displacement control module, fine setting SERVO CONTROL module and advance and retreat cutter control module, the input external temperature sensor of monitoring temperature module wherein, the output of monitoring temperature module is connected with advance and retreat cutter control module with equipment operation monitoring module respectively, the refining pulp quality control module, current detection module, the displacement control module, fine setting SERVO CONTROL module is connected successively with advance and retreat cutter control module, and the output of advance and retreat cutter control module is the hydraulic means and the end face transmission device of external disc mill respectively; The also external position sensor of the input of displacement control module, the input of current detection module is the external impressed current sensor also.

2. dense disc mill fine setting control system in according to claim 1, it is characterized in that, described end face transmission device comprises chuck, end-face helical spare, angular wheel and motor, wherein chuck is installed on the disc mill main shaft that is connected with the mill assembly, end-face helical spare is located at chuck inside, angular wheel is located at the chuck side and is connected with end-face helical spare, and the motor of being located at the angular wheel end is connected with the advance and retreat cutter control module of fine setting control system.

3. dense disc mill fine setting control system is characterized in that described chuck comprises chuck pedestal and the wedge pawl card of being located on the chuck pedestal in according to claim 2; The end-face helical of described end-face helical spare is vortex-like line; Described mill assembly comprises with the movable grinding disc and the static cutting disk that are located on the disc mill main shaft.

4. dense disc mill fine setting control system in according to claim 1, it is characterized in that, described temperature sensor is located on the disc mill main shaft bearing, and described position sensor is located on the movable grinding disc or static cutting disk of disc mill, and described current sensor is located on the bearing block.

5. dense disc mill fine setting control system is characterized in that described fine setting control system adopts PLC control system or DCS control system in according to claim 1.

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