CN100585531C - Liquid level control method and system of effusion pit in mineral cotton plate produced by moulding and wet method - Google Patents
Liquid level control method and system of effusion pit in mineral cotton plate produced by moulding and wet method Download PDFInfo
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- CN100585531C CN100585531C CN200710120327A CN200710120327A CN100585531C CN 100585531 C CN100585531 C CN 100585531C CN 200710120327 A CN200710120327 A CN 200710120327A CN 200710120327 A CN200710120327 A CN 200710120327A CN 100585531 C CN100585531 C CN 100585531C
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- 239000007788 liquid Substances 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000000465 moulding Methods 0.000 title claims abstract 3
- 229920000742 Cotton Polymers 0.000 title 1
- 229910052500 inorganic mineral Inorganic materials 0.000 title 1
- 239000011707 mineral Substances 0.000 title 1
- 238000001514 detection method Methods 0.000 claims abstract description 58
- 239000011490 mineral wool Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 230000001133 acceleration Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 239000000463 material Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The invention discloses a liquid level control method of an effusion pit in a mineral wool board produced by wet molding as well as a control system for realizing the control method. The control method comprises the following steps: a. a liquid level detection device detects the liquid level of the effusion pit in real time and inputs the detection value to a controller; b. the controller compares the detection value input by the liquid level detection device with the set value of liquid level pre-input to the controller; and c. the controller outputs control signals to control the operating state of an effusion pump connected with the effusion pit according to comparison results, so as to adjust the liquid level height in the effusion pit. The control system for realizing the liquid level control method comprises: the liquid level detection device, the controller and the effusion pump, the liquid level detection device is connected with the controller, and the controller is connected with the effusion pump.
Description
Technical Field
The invention relates to a liquid level control method, in particular to a liquid level control method of an effusion pit in mineral wool board production by wet forming, and also relates to a control system for realizing the liquid level control method.
Background
The mineral wool acoustic board is an indoor roof decorative board which is widely applied to large-scale places such as office buildings, meeting halls, music halls and the like, and has double effects of practicability and decoration.
The production process of the mineral wool sound absorption board is as follows, the mixed slurry is naturally dehydrated by a long net shoveling forming machine and is dehydrated by a vacuum system under negative pressure to form a wet board, and the wet board is dried by a dryer to form the original board. And then the finished product is made after the fine machining procedures of embossing, tenoning, spraying and the like. In the forming and dewatering process, water contained in partial slurry removed by the vacuum system enters the drainage pit and is pumped into the white water tank through the drainage pump for recycling.
During production, the liquid level control of the drainage pit is very critical, and the working of a vacuum system is influenced if the liquid level is too low; if the liquid level is controlled to be too high, the water removed from the vacuum system can submerge the motor and other equipment around the drainage pit within a few seconds, and the result is not imaginable.
Moreover, the concentration of the forming slurry is not constant due to various factors, and the working condition of the vacuum system is not constant, which determines that the amount of water flowing into the drainage pit is constantly changing. Therefore, a flexible, stable and reliable control method for controlling the liquid level in the drainage pit is needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a liquid level control method of an effusion pit in mineral wool boards produced by wet forming, which is flexible in control, stable and reliable in work and capable of controlling the liquid level within a certain range.
Therefore, the liquid level control method of the effusion pit in the wet-forming production of the mineral wool board comprises the following steps: a. detecting the liquid level of the effusion pit in real time through a liquid level detection device and inputting a detection value into a controller; b. the controller compares the detection value input by the liquid level detection device with a liquid level set value input into the controller in advance; c. the controller outputs a control signal according to the comparison result to control the working state of an effusion pump connected with the effusion pit and adjust the liquid level height in the effusion pit.
Further, the level set point comprises: the upper limit value and the lower limit value of the liquid level.
Further, in the step c, if the detection value is higher than the upper limit value of the liquid level, the controller outputs an acceleration command to the effusion pump.
Further, in the step c, if the detection value is lower than the upper limit value of the liquid level, the controller outputs a deceleration command to the effusion pump.
Further, in the step c, if the detection value is lower than the liquid level lower limit value, the controller outputs a stop command to the effusion pump.
Further, the maximum rotating speed and the minimum rotating speed of the effusion pump are controlled according to a speed upper limit value and a speed lower limit value preset in the controller, if the speed upper limit value or the speed lower limit value is reached, a high-speed instruction or a low-speed instruction is input into the effusion pump, and otherwise, an acceleration instruction or a deceleration instruction is continuously input.
Further, the rotating speed of the effusion pump is controlled by a frequency converter.
Further, a control system for implementing the liquid level control method comprises: the device comprises a liquid level detection device, a controller and an effusion pump, wherein the liquid level detection device is connected with the controller, and the controller is connected with the effusion pump; the liquid level detection device is used for detecting the liquid level height in the effusion pit in real time and inputting a detection result into the controller; the controller is used for comparing a detection value input by the liquid level detection device with a liquid level set value stored in the controller, outputting a control signal according to a comparison result and controlling the running of the effusion pump; the drainage pump is used for draining the drainage pit at different rotating speeds according to the control signal output by the controller and adjusting the liquid level height in the drainage pit.
Furthermore, a frequency converter for controlling the rotating speed of the effusion pump is arranged between the controller and the effusion pump, and the liquid level detection device is also connected with a display for displaying the detection result.
Through carrying out real-time detection to the liquid level, compare detected value and liquid level setting value, according to the operation of comparison result control effusion pump to can be within a certain scope of setting for with liquid level control, both can prevent to lead to the fact the influence because of the liquid level is low excessively to the work of system, can avoid the liquid level too high to cause again to the soaking of week peripheral, thereby improved the operational reliability of system greatly, the incidence of accident has been reduced, consequently, the production efficiency has been improved, the safe orderly of having guaranteed production goes on.
Drawings
FIG. 1 is a control flow diagram of the liquid level control method of the effusion pit in the wet-laid mineral wool slab production of the present invention;
FIG. 2 is a control system for implementing the method of level control described in FIG. 1.
Detailed Description
As shown in FIG. 1, the liquid level control method of the effusion pit in the wet-forming production of mineral wool boards of the invention comprises the following steps: first, the liquid level detection device 1 for detecting the liquid level height of the effusion pit detects the liquid level in the effusion pit in real time and inputs the detected value to the controller 2. The liquid level detection device 1 adopts a drop-in liquid level meter, and because the concentration of slurry for producing the mineral wool sound absorption board is not constant and the working condition of a vacuum system is not constant, the quantity of water flowing into a drainage pit is determined to be constantly changed, and any change of the liquid level at any time can be detected by the drop-in liquid level meter, so that the controller 2 is informed of the change of the liquid level in time, the liquid level height is adjusted in time, and the reliability is higher.
Next, the controller 2 compares the detection value input from the liquid level detection device 1 with a liquid level set value input to the controller 2 in advance. Wherein the controller 2 may employ a PLC controller. The level set point is set by the staff before the controller 2 starts working according to the requirements for the level of the liquid in the effusion pit. The liquid level set value comprises a liquid level upper limit value and a liquid level lower limit value.
The upper limit value of the liquid level is the maximum liquid level height which can be borne by the drainage pit, and if the liquid level height in the drainage pit exceeds the upper limit value of the liquid level, the drainage pit can emit materials to immerse the electrical equipment around the drainage pit. The upper limit value of the liquid level is the highest liquid level value which ensures that the overflow pit can not generate material overflow danger rapidly when the water quantity in the overflow pit is suddenly increased and can not influence the work of a vacuum system due to the over-low upper limit value of the liquid level.
The lower limit of the liquid level is the lowest liquid level height which can be borne in the drainage pit under the condition that the vacuum system can work normally. If the liquid level in the effusion pit is lower than the lower limit value of the liquid level, the work of a vacuum system can be influenced, the adverse effects of low dehydration rate of a wet plate, uneven height of the wet plate and the like are caused, and the quality of the mineral wool sound absorption plate is seriously influenced.
By setting the upper limit value and the lower limit value of the liquid level in the controller 2, the liquid level height in the drainage pit can be maintained within a range meeting the requirements, and the liquid level height cannot be too high or too low. The danger of material overflow can not occur, and the adverse effect on the work of a vacuum system can not be caused, so that the failure rate of equipment in the production process is greatly reduced, the equipment loss is reduced, and the production efficiency is improved.
And thirdly, the controller 2 outputs a control signal according to the comparison result to control the running of the effusion pump 3, thereby adjusting the liquid level height in the effusion pit. The drainage pump 3 is a drainage pump connected with the drainage pit, and the controller 2 adjusts the rotating speed of the drainage pump 3 according to the comparison result of the detection value input by the liquid level detection device 1 and the liquid level set value, so that the purposes of adjusting the drainage quantity and controlling the liquid level height in the drainage pit within a certain range are achieved. The rotational speed of the effusion pump 3 can be adjusted by means of a frequency converter 4 which is connected to the controller 2 and the effusion pump 3, respectively, so that a flexible and precise control of the rotational speed of the effusion pump 3 can be achieved.
If the controller 2 judges that the detection value input by the liquid level detection device 1 is higher than the upper limit value of the liquid level stored in the controller 2, the liquid level in the effusion pit is indicated to enter a dangerous water level, and the overflow of the effusion pit can be caused if the water is not rapidly discharged, so that loss is caused. In order to ensure the safe operation of the production equipment, at the moment, the controller 2 outputs an acceleration instruction to the frequency converter 4, the rotating speed of the effusion pump 3 is increased, the water discharge is increased, and the liquid level height in the effusion pit is reduced.
When the speed instruction in the controller 2 reaches a preset upper limit value, the controller 2 inputs a high-speed instruction to the frequency converter 4, and the effusion pump 3 continuously runs at a high speed; if the speed instruction in the controller 2 does not reach the preset upper limit value, the controller 2 continuously outputs an acceleration instruction to the frequency converter 4, and the rotating speed of the effusion pump 3 is increased until the preset upper limit value is reached. The controller 2 is convenient and flexible to control, the upper limit value of the speed instruction can be set and changed according to the actual requirements of the site, and the effusion pump 3 can reach the maximum rotating speed in the shortest time, so that the liquid level height in the effusion pit is quickly reduced, and the danger of material overflow of the effusion pit is quickly eliminated.
If the controller judges that the detection value input by the liquid level detection device 1 is lower than the upper limit value of the liquid level stored in the controller 2 and higher than the lower limit value of the liquid level, the liquid level in the effusion pit is in a proper range, and the effusion pit has no danger of material overflow and does not influence the work of a vacuum system. Since the water level in the drainage pit is rising, the drainage pump 3 can be operated at a low speed to maintain the liquid level in the drainage pit.
At this time, the controller 2 outputs a deceleration command to the inverter 4 to reduce the rotational speed of the effusion pump 3, and maintains the balance between the amount of water flowing into the effusion pit and the amount of water discharged from the effusion pit. Meanwhile, if the speed instruction of the controller 2 reaches a preset lower limit value, the controller 2 outputs a low-speed instruction to the frequency converter 4, and the rotating speed of the effusion pump 3 is maintained at the lowest rotating speed, so that the stable operation of the production equipment can be ensured; if the speed command of the controller 2 does not reach the preset lower limit value, the controller 2 continuously outputs a deceleration command to the frequency converter 3 until the rotating speed of the effusion pump 3 reaches the rotating speed lower limit value. By adopting the mode, the safe and stable operation of the equipment can be maintained, the purposes of saving electric energy and environment protection can be achieved, and the abrasion depreciation of the effusion pump 3 can be greatly reduced.
If the controller 2 judges that the detection value input by the liquid level detection device 1 is lower than the lower limit value of the liquid level, the liquid level in the effusion pit is lower. The continuous lower liquid level will affect the normal operation of the vacuum system and reduce the quality of the mineral wool sound absorption board. In order to supplement the water quantity in the effusion pit and improve the water level, at the moment, the controller 2 outputs a stop instruction to the frequency converter 4, the effusion pump 3 is suspended to run, the water quantity is supplemented, and the normal operation of the vacuum system is ensured.
As shown in fig. 2, the control system for implementing the liquid level control method includes: a detection device 1, a controller 2 and an effusion pump 3. Wherein, the liquid level detection device 1 is connected with the controller 2, and the controller 2 is connected with the effusion pump 3. The liquid level detection device 1 is used for detecting the liquid level height in the effusion pit in real time and inputting the detection result into the controller 2; the controller 2 is used for comparing a detection value input by the liquid level detection device 1 with a liquid level set value input into the controller 2 by a worker in advance, outputting a control signal according to a comparison result and controlling the running of the effusion pump 3; the effusion pump 3 is used for discharging water in the effusion pit at different rotating speeds according to a control signal input by the controller 2, thereby adjusting the liquid level height in the effusion pit.
A frequency converter 4 is arranged between the controller 2 and the effusion pump 3, and the frequency converter 4 can realize flexible and accurate control of the rotating speed of the effusion pump. The liquid level detection device 1 is further connected to a display 5, and the display 5 can be installed at any position which can be easily seen by a worker and is used for displaying the detection result detected by the liquid level detection device 1.
The working process of the control system is as follows: the liquid level detection device 1 inputs the detected liquid level height in the effusion pit into the controller 2. The controller 2 compares the input detection value with a liquid level set value which is input into the controller 2 by a worker in advance, and outputs a control signal to the frequency converter according to the result, thereby adjusting the rotating speed of the effusion pump 3 to reasonably control the liquid level height in the effusion pit. The staff can also intervene manually in controlling the operating state of the system according to the real-time level of the effusion pit displayed on the display 5.
Claims (10)
1. A liquid level control method for an effusion pit in mineral wool board production by wet molding is characterized by comprising the following steps: the method comprises the following steps:
a. the liquid level of the effusion pit is detected in real time through a liquid level detection device (1) and the detected value is input into a controller (2);
b. the controller (2) compares the detection value input by the liquid level detection device (1) with a liquid level set value input into the controller (2) in advance;
c. the controller (2) outputs a control signal according to the comparison result to control the working state of the effusion pump (3) connected with the effusion pit and adjust the liquid level height in the effusion pit.
2. The control method according to claim 1, characterized in that: the level set point comprises: the upper limit value and the lower limit value of the liquid level.
3. The control method according to claim 2, characterized in that: in step c, if the detection value is higher than the upper limit value of the liquid level, the controller (2) outputs an acceleration instruction to the effusion pump (3).
4. The control method according to claim 2, characterized in that: in step c, if the detection value is lower than the upper liquid level limit value, the controller (2) outputs a deceleration command to the effusion pump (3).
5. The control method according to claim 2, characterized in that: in step c, if the detection value is lower than the liquid level lower limit value, the controller (2) outputs a stop instruction to the effusion pump (3).
6. The control method according to claim 3, characterized in that: controlling the maximum rotating speed of the effusion pump (3) according to a speed upper limit value preset in the controller (2), and inputting a high-speed command to the effusion pump (3) if the speed upper limit value is reached, or continuously inputting an acceleration command if the speed upper limit value is not reached.
7. The control method according to claim 4, characterized in that: and controlling the lowest rotating speed of the effusion pump (3) according to a speed lower limit value preset in the controller (2), and if the rotating speed lower limit value is reached, inputting a low-speed command to the effusion pump (3), otherwise, continuously inputting a deceleration command.
8. The control method according to claim 6 or 7, characterized in that: the rotating speed of the effusion pump (3) is controlled by a frequency converter (4).
9. A control system for implementing the method of claim 1, comprising: the device comprises a liquid level detection device (1), a controller (2) and an effusion pump (3), wherein the liquid level detection device (1) is connected with the controller (2), and the controller (2) is connected with the effusion pump (3); wherein,
the liquid level detection device (1) is used for detecting the liquid level height in the effusion pit in real time and inputting the detection result into the controller (2);
the controller (2) is used for comparing a detection value input by the liquid level detection device (1) with a liquid level set value stored in the controller (2), outputting a control signal according to a comparison result and controlling the running of the effusion pump (3);
the drainage pump (3) is used for draining the drainage pit at different rotating speeds according to the control signal output by the controller (2) and adjusting the liquid level height in the drainage pit.
10. The control system of claim 9, wherein: a frequency converter (4) used for controlling the rotating speed of the effusion pump (3) is arranged between the controller (2) and the effusion pump (3), and the liquid level detection device (1) is also connected with a display (5) used for displaying the detection result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710120327A CN100585531C (en) | 2007-08-15 | 2007-08-15 | Liquid level control method and system of effusion pit in mineral cotton plate produced by moulding and wet method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710120327A CN100585531C (en) | 2007-08-15 | 2007-08-15 | Liquid level control method and system of effusion pit in mineral cotton plate produced by moulding and wet method |
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| Publication Number | Publication Date |
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| CN101369156A CN101369156A (en) | 2009-02-18 |
| CN100585531C true CN100585531C (en) | 2010-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200710120327A Active CN100585531C (en) | 2007-08-15 | 2007-08-15 | Liquid level control method and system of effusion pit in mineral cotton plate produced by moulding and wet method |
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| CN102200786A (en) * | 2010-03-25 | 2011-09-28 | 北新集团建材股份有限公司 | Remote liquid level control device for light mineral wool sound-absorbing board waste systems |
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