CN114950635B - Feeding method of high-pressure roller mill capable of automatically stabilizing material level - Google Patents
Feeding method of high-pressure roller mill capable of automatically stabilizing material level Download PDFInfo
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- CN114950635B CN114950635B CN202210639912.8A CN202210639912A CN114950635B CN 114950635 B CN114950635 B CN 114950635B CN 202210639912 A CN202210639912 A CN 202210639912A CN 114950635 B CN114950635 B CN 114950635B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/286—Feeding devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
A feeding method of a high-pressure roller mill capable of automatically stabilizing material level belongs to the technical field of crushing machinery, and particularly relates to a feeding method of a high-pressure roller mill capable of automatically stabilizing material level. The invention provides a feeding method of a high-pressure roller mill capable of automatically stabilizing material level. The invention comprises the following steps: the adjustable feeder 2 is arranged below the storage bin 1, materials output by the adjustable feeder 2 are conveyed to the position of the stabilizing bin 5 through a belt on the belt conveyor 4, the adjustable feeder 2 and a belt scale 3 on the belt conveyor 4 form a first control closed loop, the weighing value of the belt scale 3 is conveyed to the controller 8, and the controller 8 controls the blanking amount of the adjustable feeder 2 to enable the thickness of the materials on the belt of the belt conveyor 4 to be kept within a required value range, so that the working frequency and the conveying amount of the belt conveyor 4 are directly in direct proportion; the belt conveyor 4 is driven by variable frequency, and a second control closed loop is formed by the driving frequency of the belt conveyor 4 and a weighing sensor 6 which is arranged at the position of the stabilizing bin 5 and used for detecting the weight of the material in the stabilizing bin 5.
Description
Technical Field
The invention belongs to the technical field of crushing machinery, and particularly relates to a feeding method of a high-pressure roller mill capable of automatically stabilizing material level.
Background
The high-pressure roller mill is a device which is provided with high extrusion force by a hydraulic system and is matched with the feeding pressure provided by a material column with a certain height to realize lamination crushing of ores. If the feeding amount is smaller than the processing amount of the high-pressure roller mill, the material column is reduced or even disappears, and at the moment, the crushing effect is reduced, equipment vibrates, and related parts such as roller surfaces are seriously damaged. If the feeding amount is larger than the processing amount of the high-pressure roller mill, the material column in the stable bin is too high, and even overflows. Thus, a constant column is critical to the stable operation of the high pressure roller mill. At present, there are several methods for maintaining a stable height of the material column: first, manual guard sets up artifical post in high-pressure roller mill feed position, carries out long-time guard and adjusts, and the reliability is poor. Secondly, set up the sensor in the steady feed bin position of high-pressure roller mill, form closed loop control with the feed amount of belt that gives the steady feed bin of high-pressure roller mill, eliminate artifical guard, but in most mines, the conveyer belt distance from the storage silo to the high-pressure roller mill pan feeding point often is longer, the problem that appears, when there is the variation in preface storage silo unloading volume, this variation takes a period of time, just can reach the position of the steady feed bin of high-pressure roller mill, the longer the belt, the longer the time of hysteresis. The buffering time of the stable bin is generally shorter, so that the adjustment is not timely, the fluctuation of the material level of the stable bin of the high-pressure roller mill is large, even the phenomenon of overflow or empty of the stable bin occurs, and a feeding column with stable height cannot be provided for the high-pressure roller mill. Some sites are added with complex control logic in control, so that the phenomenon of delay of feeding quantity adjustment is eliminated, but the actual use effect is not ideal, and the capability of adapting to feeding quantity fluctuation is weak. Third,: a large excessive bin is arranged near a stable bin of the high-pressure roller mill, a short belt is arranged below the bin to feed the stable bin, the short belt can be made into a pull belt, the conveying capacity of the belt is only related to the belt speed, and the belt speed can form a control closed loop with the material level detection of the stable bin, so that the material level in the stable bin is stabilized. However, the storage capacity of the excessive storage bin is not large, the storage bin distance from the front is still far, and the problem of adjustment lag between the storage bin and the excessive storage bin is still not eliminated. In addition, the height of the stable bin of the high-pressure roller mill is higher, the erection height of the transition bin is higher than that of the stable bin, and the storage requirement of the transition bin is larger, so that the overall investment of the transition bin is larger.
Disclosure of Invention
The invention aims at the problems and provides a feeding method of a high-pressure roller mill capable of automatically stabilizing the material level.
In order to achieve the above purpose, the invention adopts the following technical scheme that the invention comprises the following steps:
the adjustable feeder 2 is arranged below the storage bin 1, materials output by the adjustable feeder 2 are conveyed to the position of the stabilizing bin 5 through a belt on the belt conveyor 4, the adjustable feeder 2 and a belt scale 3 on the belt conveyor 4 form a first control closed loop, the weighing value of the belt scale 3 is conveyed to the controller 8, and the controller 8 controls the blanking amount of the adjustable feeder 2 to enable the thickness of the materials on the belt of the belt conveyor 4 to be kept within a required value range, so that the working frequency and the conveying amount of the belt conveyor 4 are directly in direct proportion;
the belt conveyor 4 is driven by variable frequency, the driving frequency of the belt conveyor 4 and a weighing sensor 6 for detecting the weight of materials in the stabilizing bin 5 at the stabilizing bin 5 form a second control closed loop, the numerical value of the weighing sensor 6 is transmitted to a controller 8, the controller 8 controls the running frequency of the belt conveyor 4, and the amount of the materials fed to the stabilizing bin 5 by the belt conveyor 4 is controlled, so that the materials in the stabilizing bin 5 are stabilized within a set range.
As a preferable solution, the first control loop of the present invention is: the upper limit of the weight of the belt material and the lower limit of the weight of the belt material are set in the controller 8, if the weighing value exceeds the upper limit of the weight of the belt material, the controller 8 outputs a signal to control the running frequency of the adjustable feeder 2 to be reduced, and the blanking amount of the adjustable feeder 2 is reduced, so that the thickness of the material accumulation on the belt conveyor 4 is reduced;
when the weighing sensor of the belt scale 3 detects that the weight on the belt surface is lower than the lower limit value of the weight of the belt material set by the controller 8, the controller 8 outputs a signal to control the adjustable feeder 2 to improve the running frequency and the blanking amount of the adjustable feeder 2, so that the thickness of the belt surface of the feeding belt 4 is improved.
As another preferred solution, the adjustable feeder 2 according to the invention is a vibratory feeder.
As another preferable mode, the second control closed loop of the present invention is: an upper limit of the weight of the material in the stable bin and a lower limit of the weight of the material in the stable bin are set in the controller 8, and if the weight value transmitted by the weighing sensor 6 is lower than the lower limit of the weight of the material in the stable bin, the controller 8 controls the frequency of the belt conveyor 4 to increase, so that the belt speed is improved;
if the weight value transmitted by the weighing sensor 6 is higher than the upper limit of the material weight of the stabilizing bin, the controller 8 controls the frequency of the belt conveyor 4 to be reduced, and the belt speed is reduced.
Secondly, the thickness of the material accumulation on the belt of the belt conveyor 4 is changed in proportion to the value of the weighing sensor of the belt scale 3, and the belt width of the belt conveyor 4 is 1m; when the belt conveyor is in rated load operation, the weighing sensor of the belt conveyor scale 3 displays 0.4t, and the corresponding cross section area of the materials on the belt is 0.09m 2 The method comprises the steps of carrying out a first treatment on the surface of the The upper limit of the belt material weight of the weighing sensor of the belt scale 3 is set to be 0.42t, the lower limit of the belt material weight is set to be 0.38t, and the upper limit value of the material sectional area of the belt corresponding to the belt conveyor 4 is set to be 0.095m 2 The lower limit value is 0.086m 2 The method comprises the steps of carrying out a first treatment on the surface of the When the material on the belt is less, the frequency is increased by the vibration feeder 2 when the value of the weighing sensor of the belt scale 3 reaches the lower limit of 0.38 and t, the material falling onto the belt of the belt conveyor 4 is increased, the thickness of the material on the belt surface is increased, when the value of the bearing sensor of the belt scale 3 reaches the upper limit of 0.42 and t, the frequency is reduced by the vibration feeder 2, the thickness of the material on the belt surface is reduced, and the sectional area of the material on the belt conveyor 4 is stabilized at 0.086 and 0.086m 2 To 0.095m 2 Within the range.
In addition, the second control closed loop sets the upper limit of the material weight of the stable bin to be 15t and the lower limit to be 13t in the controller 8; when the value of the stabilizing bin weighing sensor 6 is reduced and reaches the lower limit 13t, the controller 8 controls the rotating speed of the belt conveyor 4 to be increased, the transportation quantity is increased, the controller 8 controls the rotating speed of the belt conveyor 4 to be reduced when the value of the stabilizing bin weighing sensor 6 is increased and reaches the upper limit 15t, the transportation quantity of the belt conveyor 4 is reduced along with the reduction, the value of the stabilizing bin weighing sensor is reduced, and the value of the stabilizing bin weighing sensor 6 is controlled within a set range of 13 t-15 t.
The invention has the beneficial effects that.
The invention can adjust the control closed loop formed by the feeder 2 and the belt balance 3, and can control the thickness of the material on the belt conveyor 4 within a fixed range by controlling the discharging speed of the adjustable feeder 2. The level in the stabilizing bin 5 can be controlled within a range preset by the sensor 6 by controlling the frequency of the belt conveyor 4 through the controller 8. Thereby eliminating the hysteresis of the adjustment of the conveying capacity of the belt conveyor 4 when the storage bin 1 is far away from the stabilizing bin 5. Under the condition of the change of the preface feeding amount, the material stabilizing bin 5 always has the constant-height material level, so that the high-pressure roller mill 7 can stably run for a long time.
Drawings
The invention is further described below with reference to the drawings and the detailed description. The scope of the present invention is not limited to the following description.
Fig. 1 is a schematic flow chart of a high-pressure roller mill adopting manual material level watching.
Fig. 2 is a schematic flow chart of adding an excessive bin in the high-pressure roller mill.
FIG. 3 is a schematic flow chart of continuous stable automatic feeding amount adjustment of the high-pressure roller mill.
Description of the number in the drawings: the device comprises a storage bin 1, an adjustable feeder 2, a belt scale 3, a belt conveyor 4, a stabilizing bin 5, a sensor 6, a high-pressure roller mill 7, a controller 8, a transition bin 9 and a short belt 10.
Detailed Description
As shown, the present invention includes the steps of:
the adjustable feeder 2 is arranged below the storage bin 1, the material output by the adjustable feeder 2 is conveyed to the position of the stabilizing bin 5 through a belt on the belt conveyor 4, the adjustable feeder 2 and a belt scale 3 on the belt conveyor 4 form a first control closed loop, the weighing value of the belt scale 3 is conveyed to a controller 8 (an S7-1200 controller can be adopted), and the controller 8 controls the blanking amount of the adjustable feeder 2, so that the thickness of the material on the belt of the belt conveyor 4 is kept within a required value range, and the working frequency and the conveying amount of the belt conveyor 4 are directly in direct proportion;
the belt conveyor 4 is driven by variable frequency, the driving frequency of the belt conveyor 4 and a weighing sensor 6 for detecting the weight of materials in the stabilizing bin 5 at the stabilizing bin 5 form a second control closed loop, the numerical value of the weighing sensor 6 is transmitted to a controller 8, the controller 8 controls the running frequency of the belt conveyor 4, and the amount of the materials fed to the stabilizing bin 5 by the belt conveyor 4 is controlled, so that the materials in the stabilizing bin 5 are stabilized within a set range.
The first control closed loop is as follows: the upper limit of the weight of the belt material and the lower limit of the weight of the belt material are set in the controller 8, if the weighing value exceeds the upper limit of the weight of the belt material, the controller 8 outputs a signal to control the running frequency of the adjustable feeder 2 to be reduced, and the blanking amount of the adjustable feeder 2 is reduced, so that the thickness of the material accumulation on the belt conveyor 4 is reduced;
when the weighing sensor of the belt scale 3 detects that the weight on the belt surface is lower than the lower limit value of the weight of the belt material set by the controller 8, the controller 8 outputs a signal to control the adjustable feeder 2 to improve the running frequency and the blanking amount of the adjustable feeder 2, so that the thickness of the belt surface of the feeding belt 4 is improved.
The adjustable feeder 2 adopts a vibrating feeder or a disc feeder.
The first control closed loop can realize that the thickness of the material on the belt surface of the feeding belt conveyor 4 is stabilized in a required numerical range, and the sectional area of the material is stabilized in the required numerical range without obvious fluctuation. Influencing the amount of belt conveyor feed involves two factors, one being the cross-sectional area of the material on the belt surface and one being the belt speed of the belt conveyor. A control closed loop formed by the belt scale 3 and the vibration feeder 2 ensures that the sectional area of the material on the belt surface of the feeder 4 is constant.
The variable of the material sectional area of the belt conveyor is fixed through the first control closed loop. The conveying amount of the existing belt conveyor is only related to the rotating speed of the belt conveyor, and no matter how long the belt is, the conveying amount immediately changes in proportion to the rotating speed as long as the rotating speed of the belt conveyor changes.
The second control closed loop is as follows: an upper limit of the weight of the material in the stable bin and a lower limit of the weight of the material in the stable bin are set in the controller 8, and if the weight value transmitted by the weighing sensor 6 is lower than the lower limit of the weight of the material in the stable bin, the controller 8 controls the frequency of the belt conveyor 4 to increase, so that the belt speed is improved;
if the weight value transmitted by the weighing sensor 6 is higher than the upper limit of the material weight of the stabilizing bin, the controller 8 controls the frequency of the belt conveyor 4 to be reduced, and the belt speed is reduced.
The first control closed loop makes the material sectional area on the belt surface constant, and the transport capacity of the belt conveyor 4 is only related to the belt speed at the moment, so that no matter how far the storage bin 1 is from the stable bin 5, the hysteresis phenomenon can not be generated in the stable bin 5 when the transport capacity of the belt conveyor 4 is adjusted. The two closed loops can enable the feeding system of the roller press to sensitively stabilize the material level in the material stabilizing bin, provide a premise for the stable work of the roller press, and simultaneously have clear and simple control logic, and are easier to realize automatic control and unattended operation. In addition, the lag of the feeding belt conveying amount adjustment is thoroughly eliminated, so that the feeding belt of the high-pressure roller mill is not limited by the conveying distance, and the adaptability to different sites is stronger.
The thickness of the material accumulation on the belt of the belt conveyor 4 is changed in proportion to the value of the weighing sensor of the belt scale 3, and the belt width of the belt conveyor 4 is 1m; when the belt conveyor is in rated load operation, the weighing sensor of the belt conveyor scale 3 displays 0.4t, and the corresponding cross section area of the materials on the belt is 0.09m 2 The method comprises the steps of carrying out a first treatment on the surface of the The upper limit of the belt material weight of the weighing sensor of the belt scale 3 is set to be 0.42t, the lower limit of the belt material weight is set to be 0.38t, and the upper limit value of the material sectional area of the belt corresponding to the belt conveyor 4 is set to be 0.095m 2 The lower limit value is 0.086m 2 The method comprises the steps of carrying out a first treatment on the surface of the When the material on the belt is less, the frequency is increased by the vibration feeder 2 when the value of the weighing sensor of the belt scale 3 reaches the lower limit of 0.38 and t, the material falling onto the belt of the belt conveyor 4 is increased, the thickness of the material on the belt surface is increased, when the value of the bearing sensor of the belt scale 3 reaches the upper limit of 0.42 and t, the frequency is reduced by the vibration feeder 2, the thickness of the material on the belt surface is reduced, and the sectional area of the material on the belt conveyor 4 is stabilized at 0.086 and 0.086m 2 To 0.095m 2 Within the range.
The second control closed loop is characterized in that the upper limit of the weight of the material in the stabilizing bin is set to be 15t, and the lower limit of the weight of the material in the stabilizing bin is set to be 13t in the controller 8; when the value of the stabilizing bin weighing sensor 6 is reduced and reaches the lower limit 13t, the controller 8 controls the rotating speed of the belt conveyor 4 to be increased, the transportation quantity is increased, the controller 8 controls the rotating speed of the belt conveyor 4 to be reduced when the value of the stabilizing bin weighing sensor 6 is increased and reaches the upper limit 15t, the transportation quantity of the belt conveyor 4 is reduced along with the reduction, the value of the stabilizing bin weighing sensor is reduced, and the value of the stabilizing bin weighing sensor 6 is controlled within the set range of 13 t-15 t.
The material falls from the storage bin 1 and passes through the adjustable feeder 2 and then passes through the belt scale 3, and the distance between the belt scale 3 and the adjustable feeder 2 can be within 20 meters.
The devices involved in the feeding method are all conventional devices, the controller 8 collects detection signals of the sensors, and the corresponding devices are also conventional technologies through feedback control of the detection signals. The invention is characterized in that the feeding process is controlled by two control closed loops.
By adopting the feeding method, the material level of the high-pressure roller can be reliably and automatically controlled without erecting an excessive material bin, and the manual watching is completely eliminated. The feeding part eliminates the phenomenon of lag in the long-distance belt feeding amount adjusting effect through two parallel control closed loops. Meanwhile, a control scheme with high difficulty, low reliability and the like such as fuzzy control is not needed. The feeding amount adjusting effect is not influenced by the length of the belt any more, the adaptability to the mine site conditions is strong, and finally the high-pressure roller mill can obtain a stable stock column.
The first control loop is to fix the thickness of the material on the belt. The second control closed loop can quickly adjust the belt conveying capacity without hysteresis phenomenon on the basis of the realization of the first control closed loop, so as to adjust the material level in the storage bin and stabilize the material level in the set range. The first control closed loop is the basis for realizing the second control closed loop, can lead the control of the second control closed loop not to have hysteresis, thereby being suitable for the longer site of the belt,
it should be understood that the foregoing detailed description of the present invention is provided for illustration only and is not limited to the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention may be modified or substituted for the same technical effects; as long as the use requirement is met, the invention is within the protection scope of the invention.
Claims (1)
1. The feeding method of the high-pressure roller mill capable of automatically stabilizing the material level is characterized by comprising the following steps of:
the adjustable feeder (2) is arranged below the storage bin (1), materials output by the adjustable feeder (2) are conveyed to the position of the stabilizing bin (5) through a belt on the belt conveyor (4), the adjustable feeder (2) and a belt scale (3) on the belt conveyor (4) form a first control closed loop, the weighing value of the belt scale (3) is conveyed to the controller (8), the controller (8) controls the blanking amount of the adjustable feeder (2), so that the thickness of the materials on the belt of the belt conveyor (4) is kept within a required value range, and the working frequency and the conveying amount of the belt conveyor (4) are directly in direct proportion relation;
the belt conveyor (4) is driven in a variable frequency mode, a driving frequency of the belt conveyor (4) and a weighing sensor (6) for detecting the weight of materials in the stabilizing bin (5) at the stabilizing bin (5) form a second control closed loop, the numerical value of the weighing sensor (6) is transmitted to the controller (8), the controller (8) controls the running frequency of the belt conveyor (4), and the amount of the materials fed to the stabilizing bin (5) by the belt conveyor (4) is controlled, so that the materials in the stabilizing bin (5) are stabilized within a set range;
the first control closed loop is as follows: an upper limit of the weight of the belt material and a lower limit of the weight of the belt material are set in the controller (8), if the weighing value exceeds the upper limit of the weight of the belt material, the controller (8) outputs a signal to control the running frequency of the adjustable feeder (2) to be reduced, and the blanking amount of the adjustable feeder (2) is reduced, so that the thickness of the material accumulation on the belt conveyor (4) is reduced;
when the weighing sensor of the belt scale (3) detects that the weight on the belt surface is lower than the lower limit value of the weight of the belt material set by the controller (8), the controller (8) outputs a signal to control the adjustable feeder (2) to improve the running frequency and the blanking amount of the adjustable feeder (2), so that the thickness on the belt surface of the feeding belt is improved;
the adjustable feeder (2) adopts a vibrating feeder;
the second control closed loop is as follows: an upper limit of the weight of the material in the stable bin and a lower limit of the weight of the material in the stable bin are set in the controller (8), and if the weight value transmitted by the weighing sensor (6) is lower than the lower limit of the weight of the material in the stable bin, the controller (8) controls the frequency of the belt conveyor (4) to increase, so that the belt speed is improved;
if the weight value transmitted by the weighing sensor (6) is higher than the upper limit of the weight of the material in the stabilizing bin, the controller (8) controls the frequency of the belt conveyor (4) to be reduced, and the belt speed is reduced;
the thickness of the material accumulation on the belt of the belt conveyor (4) is changed in proportion to the value of the weighing sensor of the belt scale (3), and the belt width of the belt conveyor (4) is 1m; when the belt conveyor is in rated load running, the weighing sensor of the belt conveyor scale (3) displays 0.4t, and the corresponding cross section area of the materials on the belt is 0.09m 2 The method comprises the steps of carrying out a first treatment on the surface of the The upper limit of the belt material weight of the weighing sensor of the belt scale (3) is set to be 0.42t, the lower limit of the belt material weight is set to be 0.38t, and the upper limit value of the material sectional area of the belt corresponding to the belt conveyor (4) is set to be 0.095m 2 The lower limit value is 0.086m 2 The method comprises the steps of carrying out a first treatment on the surface of the When the material on the belt is less, the frequency is increased by the vibrating feeder when the value of the weighing sensor of the belt scale (3) reaches the lower limit of 0.38 and t, the material falling onto the belt of the belt conveyor (4) is increased, the thickness of the material on the belt surface is increased, when the value of the bearing sensor of the belt scale (3) reaches the upper limit of 0.42 and t, the frequency is reduced by the vibrating feeder, the thickness of the material on the belt surface is reduced, and the sectional area of the material on the belt conveyor (4) is stabilized at 0.086 and 0.086m 2 To 0.095m 2 Within the range;
the second control closed loop is characterized in that the upper limit of the weight of the material in the material stabilizing bin is set to be 15t, and the lower limit of the weight of the material in the material stabilizing bin is set to be 13t in the controller (8); when the value of the stabilizing bin weighing sensor (6) is reduced and reaches the lower limit 13t, the controller (8) controls the rotating speed of the belt conveyor (4) to be increased, the transportation quantity is increased, the value of the stabilizing bin weighing sensor (6) is increased, when the value of the stabilizing bin weighing sensor reaches the upper limit 15t, the controller (8) controls the rotating speed of the belt conveyor (4) to be reduced, the transportation quantity of the belt conveyor (4) is reduced, the value of the stabilizing bin weighing sensor is reduced, and the value of the stabilizing bin weighing sensor (6) is controlled within a set range of 13 t-15 t;
the first control closed loop can realize that the thickness of the material on the belt surface of the feeding belt conveyor is stabilized in a required numerical range, and the sectional area of the material is stabilized in the required numerical range without obvious fluctuation; the influence on the feeding amount of the belt conveyor comprises two factors, namely the sectional area of the material on the belt surface and the belt speed of the belt conveyor; a control closed loop formed by the belt scale and the vibrating feeder ensures that the sectional area of the material on the belt surface of the feeder belt is constant;
fixing the variable of the material sectional area of the belt conveyor through a first control closed loop; the conveying amount of the existing belt conveyor is only related to the rotating speed of the belt conveyor, and no matter how long the belt is, the conveying amount immediately changes in proportion to the rotating speed as long as the rotating speed of the belt conveyor changes;
the first control closed loop enables the material sectional area on the belt surface to be constant, and the transport capacity of the belt conveyor is only related to the belt speed, so that no matter how far the storage bin is away from the stabilizing bin, the hysteresis phenomenon can not be generated in the stabilizing bin when the transport capacity of the belt conveyor is adjusted; the two closed loops can enable the feeding system of the roller press to be capable of stabilizing the material level in the material stabilizing bin more sensitively, provide a premise for the roller press to work stably, and enable the control logic to be clear and simple, so that automatic control and unattended operation are easier to realize; in addition, the lag of the adjustment of the conveying amount of the feeding belt is thoroughly eliminated, so that the feeding belt of the high-pressure roller mill is not limited by the conveying distance, and the adaptability to different sites is stronger;
the materials fall from the storage bin, pass through the adjustable feeder firstly and then pass through the belt scale, and the distance between the belt scale and the adjustable feeder is within 20 meters;
all the devices involved in the feeding method are conventional devices, the controller collects detection signals of the sensors, and the corresponding devices are controlled by feedback of the detection signals, which is also conventional technology; the invention is creatively embodied in that the feeding process is controlled through two control closed loops;
the material level of the high-pressure roller is reliably and automatically controlled without erecting an excessive material bin, and the manual watching is completely eliminated; the feeding part eliminates the phenomenon of lag in the long-distance belt feeding amount adjusting effect through two parallel control closed loops; meanwhile, a control scheme with high difficulty, low reliability and the like such as fuzzy control is not needed; the feeding amount adjusting effect is not influenced by the length of the belt any more, the adaptability to the mine site conditions is strong, and finally, the high-pressure roller mill obtains a stable stock column;
the first control closed loop is used for fixing the thickness of a material on the belt; the second control closed loop is used for quickly adjusting the belt conveying capacity without hysteresis on the basis of the realization of the first control closed loop, so that the material level in the storage bin is adjusted, and the material level is stabilized in a set range; the first control closed loop is the basis for realizing the second control closed loop, so that the control of the second control closed loop is free from hysteresis, and the belt conveyor belt control system can be suitable for a longer field.
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