CN114682373A - External circulation vertical mill monitoring device system with variable input rotating speed and intelligent control method thereof - Google Patents
External circulation vertical mill monitoring device system with variable input rotating speed and intelligent control method thereof Download PDFInfo
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Abstract
The invention relates to an external circulation vertical mill monitoring device system with variable input rotating speed and an intelligent control method thereof, and the system comprises a main speed reducer, a grinding disc assembly, a main motor, an auxiliary oil station, a plurality of pressurizing components, a frequency conversion system, a monitoring point system and a data acquisition and operation system, wherein the grinding disc assembly is arranged at the top of the main speed reducer and connected with an output shaft of the main speed reducer; the invention has the material layer adjusting means, and then the relative zero point speed of the grinding roller and the grinding disc can be automatically adjusted to be within the reasonable interval range, so that the adaptability of the outer circulation vertical grinding material layer is greatly improved, the grinding quality is ensured, and the stability of the outer circulation vertical grinding is effectively ensured.
Description
Technical Field
The invention relates to an external circulation vertical mill monitoring device system with variable input rotating speed and an intelligent control method thereof.
Background
The vertical mill is a material bed grinding mechanical device, and is widely applied to industries such as cement, electric power and coal at present, because the sensitivity of the external circulation vertical mill to a material bed is high, the existing external circulation vertical mill lacks a material bed adjusting means, once the thickness and the uniformity of the material bed are changed, the operation parameters of the external circulation vertical mill cannot be automatically adapted, the stability of the grinding quality cannot be ensured, the operation stability of the external circulation vertical mill can be influenced at the same time, and urgent needs to be solved.
Disclosure of Invention
In view of the current situation of the prior art, the technical problem to be solved by the invention is to provide an external circulation vertical mill monitoring device system with variable input rotation speed and an intelligent control method thereof, wherein the relative zero speed of a grinding roller and a grinding disc can be automatically adjusted to a reasonable interval range, so that the adaptability of an external circulation vertical mill material layer is greatly improved, the grinding quality is ensured, and the stability of the external circulation vertical mill is effectively ensured.
The technical scheme adopted by the invention for solving the technical problems is as follows: an external circulation vertical mill monitoring device system with variable input rotating speed comprises a main speed reducer, a mill assembly, a main motor, an auxiliary oil station and a plurality of pressurizing components, wherein the mill assembly is arranged at the top of the main speed reducer and is connected with an output shaft of the main speed reducer; the monitoring point system comprises a first monitoring point and a second monitoring point which are arranged on the frequency conversion device and used for monitoring the current and the operating frequency of the main motor respectively, a third monitoring point which is arranged in the main motor and used for monitoring the temperature of a winding and a bearing of the main motor, a fourth monitoring point which is arranged on the main speed reducer and used for monitoring the vibration condition of the main speed reducer, a fifth monitoring point which is arranged in the main speed reducer and used for monitoring the temperature of the bearing of the main speed reducer, a sixth monitoring point which is arranged at the joint of the loading oil cylinder and the stand column assembly and used for monitoring the thickness of a material layer, a seventh monitoring point which is arranged at the joint of the grinding roller assembly and the rocker arm assembly and used for monitoring the rotating speed of the grinding roller, an eighth monitoring point and a ninth monitoring point which are arranged on the loading oil station and used for monitoring the loading pressure and the temperature of the grinding roller respectively, and a tenth monitoring point which is arranged on the auxiliary oil station and used for monitoring the oil pressure; the data acquisition and operation device is connected with the first monitoring point, the second monitoring point, the third monitoring point, the fourth monitoring point, the fifth monitoring point, the sixth monitoring point, the seventh monitoring point, the eighth monitoring point, the ninth monitoring point and the tenth monitoring point and is used for acquiring output values and carrying out logical operation.
Preferably, the first monitoring point and the eighth monitoring point have signal input and output functions at the same time, and the second monitoring point, the third monitoring point, the fourth monitoring point, the fifth monitoring point, the sixth monitoring point, the seventh monitoring point, the ninth monitoring point and the tenth monitoring point only have an output function.
An intelligent control method of an external circulation vertical mill monitoring device system with variable input rotating speed is characterized by comprising the following steps:
(1) when the external circulation vertical mill normally operates, feedback values of a first monitoring point, a second monitoring point, a third monitoring point, a fourth monitoring point, a fifth monitoring point, a sixth monitoring point, a seventh monitoring point, an eighth monitoring point, a ninth monitoring point and a tenth monitoring point are all in a normal range, a data acquisition and operation system calculates a grinding disc rotating speed n2 according to a main motor operating frequency f fed back by a frequency conversion device, an output rotating speed n1 and a main speed reducer speed ratio i under a main motor rated frequency f1 according to the current operating condition, and simultaneously calculates a linear speed at a grinding disc nominal diameter d1, and because the linear speed at a grinding roller nominal diameter d2, which is the maximum outer diameter, is equal to the linear speed at a grinding disc nominal diameter d1 during the design of the external circulation vertical mill, an ideal rotating speed n3 (f/f1 n/i) (d1/d2) is calculated and set, and then the real-time rotating speed n fed back by the seventh monitoring point at the moment is equal to n3 and n3+ n (n + n is an ideal rotating speed Δ n) (Δ n + n) (Δ n is an ideal rotating speed Δ n) for the ideal rotating speed Δ n + n) (Δ n) of the grinding roller design and is set by the design of the grinding roller design Difference), the data acquisition and operation system judges whether the relative zero point speed point of the roller disc is in the ideal interval range or not and prompts whether the feeding amount W is adjusted or not according to the comparison result of the actual material layer thickness h fed back by the sixth monitoring point and the ideal material layer thicknesses h3 and h3 +/-delta h (delta h is the ideal material layer thickness deviation);
(2) if the data acquisition and operation system judges that: n is not less than n3 and not more than n3+ delta n, and h is not less than h 3-delta h and not more than h3+ delta h, the data acquisition and operation system does not output and change the feedback data of the first monitoring point and the eighth monitoring point, only processes the feedback data of the other monitoring points, and the 'relative zero point speed' point of the roller disc is in an ideal interval range at the moment;
(3) if the data acquisition and operation system judges that: n3 is not less than n3+ delta n, h is more than h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system increases the loading pressure P of the grinding roller through an eighth monitoring point but cannot exceed the maximum loading pressure value, the feeding system is prompted to reduce the feeding amount W, and if the relative zero point speed is still in a deviation state, the running frequency f of the main motor is increased through a first monitoring point but cannot exceed the maximum running frequency;
(4) if the data acquisition and operation system judges that: n3 is more than or equal to n3+ delta n, h is less than h 3-delta h, the deviation of the relative zero point speed of the roller disc is prompted, the loading pressure P of the grinding roller is reduced by the data acquisition and operation system through an eighth monitoring point but cannot be less than the minimum loading pressure value, the feeding system is prompted to increase the feeding amount W, and if the relative zero point speed is still in a deviation state, the running frequency f of the main motor is reduced by the first monitoring point but cannot be less than the minimum running frequency;
(5) if the data acquisition and operation system judges that: n is more than n3+ delta n, h is more than or equal to h 3-delta h and less than or equal to h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the running frequency f of the main motor is reduced through a first monitoring point but cannot exceed the maximum frequency set value by the data acquisition and operation system, and if the relative zero point speed is still in a deviation state, the loading pressure P of the grinding roller is reduced through an eighth monitoring point but cannot be smaller than the minimum loading pressure value;
(6) if the data acquisition and operation system judges that: n is more than n3+ delta n, h is more than h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system reduces the running frequency f of the main motor through a first monitoring point but cannot exceed the maximum frequency set value and prompts the feeding system to reduce the feeding amount W, and if the relative zero point speed is still in a deviation state, the loading pressure P of the grinding roller is increased through an eighth monitoring point but cannot exceed the maximum loading pressure value;
(7) if the data acquisition and operation system judges that: n is more than n3+ delta n and h is less than h 3-delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system reduces the running frequency f of the main motor through a first monitoring point but cannot be less than a minimum frequency set value and prompts the feedback to the feeding system to increase the feeding amount W, and if the relative zero point speed is still in a deviation state, the loading pressure P of the grinding roller is reduced through an eighth monitoring point but cannot be less than the minimum loading pressure value;
(8) if the data acquisition and operation system judges that: n is more than n3, h is more than or equal to h 3-delta h and less than or equal to h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system improves the running frequency f of the main motor through a first monitoring point but cannot exceed the maximum frequency set value, reduces the loading pressure P of the grinding roller through an eighth monitoring point but cannot be less than the minimum loading pressure value, and if the relative zero point speed is still in a deviation state, the feeding system is prompted to increase the feeding amount W;
(9) if the data acquisition and operation system judges that: n is less than n3, h is more than h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system increases the running frequency f of the main motor through a first monitoring point but cannot exceed the maximum frequency set value, increases the loading pressure P of the grinding roller through an eighth monitoring point but cannot exceed the maximum loading pressure value, and if the relative zero point speed is still in a deviation state, the feeding system is prompted to reduce the feeding amount W;
(10) if the data acquisition and operation system judges that: n is less than n3, h is less than h 3-delta h, the deviation of the relative zero point speed of the roller disc is prompted, the operation frequency of a main motor of a first monitoring point is increased by f but cannot exceed a maximum frequency set value, the loading pressure P of the grinding roller is reduced by an eighth monitoring point but cannot be less than a minimum loading pressure value, and if the relative zero point speed is still in a deviation state, the feeding system is prompted to increase the feeding amount W;
(11) if the operating frequency of the main motor changes, all logic judgment of n3 needs to be recalculated, whether the feedback values of the second monitoring point, the third monitoring point, the fourth monitoring point, the fifth monitoring point, the sixth monitoring point, the seventh monitoring point, the ninth monitoring point and the tenth monitoring point are within a set range or not is monitored in real time, and if the feedback values exceed the set range, an interlocking reaction is carried out.
Compared with the prior art, the invention has the advantages that: the invention has the advantages that the frequency conversion system, the monitoring point system and the data acquisition and operation system are added, and the intelligent control logic is combined to have a material layer adjusting means, so that the relative zero point speed of the grinding roller and the grinding disc can be automatically adjusted to be within a reasonable interval range, the adaptability of the material layer of the external circulation vertical mill is greatly improved, the grinding quality is ensured, and the stability of the external circulation vertical mill is effectively ensured.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic diagram of relative zero point velocity points for a disc grinding roll of the present invention.
Detailed Description
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.
As shown in fig. 1, an external circulation vertical mill monitoring device system with variable input rotation speed comprises a main speed reducer 02, a grinding disc assembly 03 arranged at the top of the main speed reducer 02 and connected with an output shaft of the main speed reducer 02, a main motor 01 connected with an input shaft of the main speed reducer 02 and capable of driving the grinding disc assembly 03 to operate through the main speed reducer 02, an auxiliary oil station 09 connected with the grinding disc assembly 03, and a plurality of pressurizing components uniformly arranged at equal angles along the circumferential direction, wherein the pressurizing components comprise a rack 05, a stand column assembly 06 rotatably arranged on the rack 05, a grinding roller assembly 07 arranged on the stand column assembly 06, a loading oil cylinder 04 arranged on the rack 05 and connected with the stand column assembly 06, and a loading oil station 08 connected with the loading oil cylinder 04; the system also comprises a frequency conversion system 1, a monitoring point system 2 and a data acquisition and operation system 3, wherein the frequency conversion system 1 comprises a frequency conversion device 10 which is connected with the main motor 01 and can adjust the input frequency of the main motor 01; when the rotating speed of the main motor 01 changes, the output rotating speed of the main speed reducer 02 changes, and the rotating speed of the grinding disc assembly 03 changes finally due to the fact that the grinding disc assembly 03 is connected with the output shaft of the main speed reducer 02, so that the external circulation vertical mill with the variable input rotating speed is formed.
The monitoring point system 2 comprises a first monitoring point 101 and a second monitoring point 102 which are arranged on the frequency conversion device 10 and used for respectively monitoring the current and the operating frequency of the main motor 01, a third monitoring point 011 which is arranged in the main motor 01 and used for monitoring the winding and bearing temperature of the main motor 01, a fourth monitoring point 021 which is arranged on the main speed reducer 02 and used for monitoring the vibration condition of the main speed reducer 02, a fifth monitoring point 022 which is arranged in the main speed reducer 02 and used for monitoring the bearing temperature of the main speed reducer 02, a sixth monitoring point 466 which is arranged at the joint of the loading oil cylinder 04 and the upright post assembly 06 and is used for monitoring the thickness of a material layer, a seventh monitoring point 671 which is arranged at the joint of the grinding roller assembly 07 and the rocker arm assembly 06 and is used for monitoring the rotating speed of the grinding roller, an eighth monitoring point 081 and a ninth monitoring point 082 which are arranged on the loading oil station 08 and are used for respectively monitoring the loading pressure and the temperature of the grinding roller, and a tenth monitoring point 091 which is arranged on the auxiliary oil station 09 and is used for monitoring the oil pressure; first monitor point 101 and eighth monitor point 081 have both signal input and output functions, and second monitor point 102, third monitor point 011, fourth monitor point 021, fifth monitor point 022, sixth monitor point 466, seventh monitor point 671, ninth monitor point 082 and tenth monitor point 091 have only an output function.
Data acquisition and operation device 3 is connected with first monitor point 101, second monitor point 102, third monitor point 011, fourth monitor point 021, fifth monitor point 022, sixth monitor point 466, seventh monitor point 671, eighth monitor point 081, ninth monitor point 082 and tenth monitor point 091 for acquiring output value and carrying out logic operation.
As shown in fig. 2, an intelligent control method for an external circulation vertical mill monitoring device system with variable input rotation speed includes the following steps:
(1) when the external circulation vertical mill normally operates, the feedback values of the first monitoring point 101, the second monitoring point 102, the third monitoring point 011, the fourth monitoring point 021, the fifth monitoring point 022, the sixth monitoring point 466, the seventh monitoring point 671, the eighth monitoring point 081, the ninth monitoring point 082 and the tenth monitoring point 091 are all in a normal range, the data acquisition and calculation system 3 calculates the grinding disc rotating speed n2 according to the operating frequency f of the main motor fed back by the frequency conversion device 10, the output rotating speed n1 under the rated frequency f1 of the main motor and the speed ratio i of the main speed reducer according to the current operating condition, and simultaneously calculates the linear speed at the nominal diameter d1 of the grinding disc, and because the linear speed at the maximum outer diameter d2 which is the nominal diameter of the grinding roller when the external circulation vertical mill is designed is equal to the linear speed at the nominal diameter d1 of the grinding disc, the ideal rotating speed n3 of the grinding roller is calculated and designed as (f/f1 n/i) (d1/d2) and set, then, the real-time rotation speed n of the grinding roller fed back by the seventh monitoring point 671 at the moment is compared with n3 and n3+ delta n (delta n is an ideal rotation speed deviation), and the data acquisition and operation system 3 judges whether the relative zero point speed point of the roller disc is in an ideal interval range or not and prompts whether the feeding amount W is adjusted or not by combining the comparison result of the actual material layer thickness h fed back by the sixth monitoring point 466 and the ideal material layer thicknesses h3 and h3 +/-delta h (delta h is an ideal material layer thickness deviation).
(2) If the data acquisition and operation system 3 judges that: n is more than or equal to n3 and less than or equal to n3+ delta n, and h is more than or equal to h 3-delta h and less than or equal to h3+ delta h, the data acquisition and operation system 3 does not output and change the feedback data of the first monitoring point 101 and the eighth monitoring point 081, only processes the feedback data of the other monitoring points, and the relative zero speed point of the roller disc is in the ideal interval range.
(3) If the data acquisition and operation system 3 judges that: n3 is not less than n3+ delta n and h is more than h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system 3 increases the loading pressure P of the grinding roller through an eighth monitoring point 081 but cannot exceed the maximum loading pressure value and prompts the feeding system to reduce the feeding amount W, and if the relative zero point speed is still in a deviation state, the operation frequency f of the main motor 01 is increased through the first monitoring point 101 but cannot exceed the maximum operation frequency.
(4) If the data acquisition and operation system 3 judges that: n3 is more than or equal to n3+ delta n, h is less than h 3-delta h, the deviation of the relative zero point speed of the roller disc is prompted, the loading pressure P of the grinding roller is reduced through an eighth monitoring point 081 but cannot be less than the minimum loading pressure value, the feeding system is prompted to increase the feeding amount W, and if the relative zero point speed is still in a deviation state, the operation frequency f of the main motor 01 is reduced through the first monitoring point 101 but cannot be less than the minimum operation frequency.
(5) If the data acquisition and operation system 3 judges that: n is more than n3+ delta n, h is more than or equal to h 3-delta h and less than or equal to h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system 3 reduces the running frequency f of the main motor 01 through the first monitoring point 101 but cannot exceed the maximum frequency set value, and if the relative zero point speed is still in the deviation state, the loading pressure P of the grinding roller is reduced through the eighth monitoring point 081 but cannot be smaller than the minimum loading pressure value.
(6) If the data acquisition and operation system 3 judges that: n is more than n3+ delta n, h is more than h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system 3 reduces the operation frequency f of the main motor 01 through the first monitoring point 101 but cannot exceed the maximum frequency set value and prompts the feeding system to reduce the feeding amount W, and if the relative zero point speed is still in a deviation state, the loading pressure P of the grinding roller is increased through the eighth monitoring point 081 but cannot exceed the maximum loading pressure value.
(7) If the data acquisition and operation system 3 judges that: n is more than n3+ delta n, h is more than h 3-delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system 3 reduces the operation frequency f of the main motor 01 through a first monitoring point 101 but cannot be less than a minimum frequency set value and prompts the feedback to the feeding system to increase the feeding amount W, and if the relative zero point speed is still in a deviation state, the loading pressure P of the grinding roller is reduced through an eighth monitoring point 081 but cannot be less than the minimum loading pressure value.
(8) If the data acquisition and operation system 3 judges that: n is less than n3, h is more than or equal to h 3-delta h and less than or equal to h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system 3 increases the running frequency f of the main motor 01 through the first monitoring point 101 but cannot exceed the maximum frequency set value, reduces the loading pressure P of the grinding roller through the eighth monitoring point 081 but cannot be less than the minimum loading pressure value, and if the relative zero point speed is still in a deviation state, the feeding system is prompted to increase the feeding amount W.
(9) If the data acquisition and operation system 3 judges that: n is less than n3, h is more than h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system 3 increases the running frequency f of the main motor 01 through a first monitoring point 101 but cannot exceed the maximum frequency set value, increases the loading pressure P of the grinding roller through an eighth monitoring point 081 but cannot exceed the maximum loading pressure value, and prompts the feeding system to reduce the feeding amount W if the relative zero point speed is still in a deviation state.
(10) If the data acquisition and operation system 3 judges that: n is less than n3, h is less than h 3-delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system 3 increases the operation frequency f but cannot exceed the maximum frequency set value through the first monitoring point 101 main motor 01, reduces the loading pressure P of the grinding roller but cannot be less than the minimum loading pressure value through the eighth monitoring point 081, and prompts the feeding system to increase the feeding amount W if the relative zero point speed is still in a deviation state.
(11) If the operation frequency of the main motor 01 changes, all logic judgment of n3 needs to be recalculated, and whether the feedback values of the second monitoring point 102, the third monitoring point 011, the fourth monitoring point 021, the fifth monitoring point 022, the sixth monitoring point 466, the seventh monitoring point 671, the ninth monitoring point 082 and the tenth monitoring point 091 are in a set range or not is monitored in real time, and if the feedback values exceed the set range, an interlocking reaction is performed.
The invention has the advantages that the frequency conversion system 1, the monitoring point system 2 and the data acquisition and operation system 3 are added, and the intelligent control logic is combined to have a material layer adjusting means, so that the relative zero speed of the grinding roller and the grinding disc can be automatically adjusted to be within a reasonable interval range, the adaptability of the outer circulation vertical grinding material layer is greatly improved, the grinding quality is ensured, and the stability of the outer circulation vertical grinding is effectively ensured.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. An external circulation vertical mill monitoring device system with variable input rotating speed comprises a main speed reducer, a mill assembly, a main motor, an auxiliary oil station and a plurality of pressurizing components, wherein the mill assembly is arranged at the top of the main speed reducer and is connected with an output shaft of the main speed reducer; the monitoring point system comprises a first monitoring point and a second monitoring point which are arranged on the frequency conversion device and used for monitoring the current and the operating frequency of the main motor respectively, a third monitoring point which is arranged in the main motor and used for monitoring the temperature of a winding and a bearing of the main motor, a fourth monitoring point which is arranged on the main speed reducer and used for monitoring the vibration condition of the main speed reducer, a fifth monitoring point which is arranged in the main speed reducer and used for monitoring the temperature of the bearing of the main speed reducer, a sixth monitoring point which is arranged at the joint of the loading oil cylinder and the stand column assembly and used for monitoring the thickness of a material layer, a seventh monitoring point which is arranged at the joint of the grinding roller assembly and the rocker arm assembly and used for monitoring the rotating speed of the grinding roller, an eighth monitoring point and a ninth monitoring point which are arranged on the loading oil station and used for monitoring the loading pressure and the temperature of the grinding roller respectively, and a tenth monitoring point which is arranged on the auxiliary oil station and used for monitoring the oil pressure; the data acquisition and operation device is connected with the first monitoring point, the second monitoring point, the third monitoring point, the fourth monitoring point, the fifth monitoring point, the sixth monitoring point, the seventh monitoring point, the eighth monitoring point, the ninth monitoring point and the tenth monitoring point and is used for acquiring output values and carrying out logical operation.
2. The system of claim 1, wherein the first monitoring point and the eighth monitoring point have signal input and output functions at the same time, and the second monitoring point, the third monitoring point, the fourth monitoring point, the fifth monitoring point, the sixth monitoring point, the seventh monitoring point, the ninth monitoring point and the tenth monitoring point have only output functions.
3. An intelligent control method of an external circulation vertical mill monitoring device system with variable input rotating speed is characterized by comprising the following steps:
(1) when the external circulation vertical mill normally operates, feedback values of a first monitoring point, a second monitoring point, a third monitoring point, a fourth monitoring point, a fifth monitoring point, a sixth monitoring point, a seventh monitoring point, an eighth monitoring point, a ninth monitoring point and a tenth monitoring point are all in a normal range, a data acquisition and operation system calculates a grinding disc rotating speed n2 according to a main motor operating frequency f fed back by a frequency conversion device, an output rotating speed n1 and a main speed reducer speed ratio i under a main motor rated frequency f1 according to the current operating condition, and simultaneously calculates a linear speed at a grinding disc nominal diameter d1, and because the linear speed at a grinding roller nominal diameter d2, which is the maximum outer diameter, is equal to the linear speed at a grinding disc nominal diameter d1 during the design of the external circulation vertical mill, an ideal rotating speed n3 (f/f1 n/i) (d1/d2) is calculated and set, and then the real-time rotating speed n fed back by the seventh monitoring point at the moment is equal to n3 and n3+ n (n + n is an ideal rotating speed Δ n) (Δ n + n) (Δ n is an ideal rotating speed Δ n) for the ideal rotating speed Δ n + n) (Δ n) of the grinding roller design and is set by the design of the grinding roller design Difference), the data acquisition and operation system judges whether the relative zero point speed point of the roller disc is in the ideal interval range or not and prompts whether the feeding amount W is adjusted or not according to the comparison result of the actual material layer thickness h fed back by the sixth monitoring point and the ideal material layer thicknesses h3 and h3 +/-delta h (delta h is the ideal material layer thickness deviation);
(2) if the data acquisition and operation system judges that: n is not less than n3 and not more than n3+ delta n, and h is not less than h 3-delta h and not more than h3+ delta h, the data acquisition and operation system does not output and change the feedback data of the first monitoring point and the eighth monitoring point, only processes the feedback data of the other monitoring points, and the 'relative zero point speed' point of the roller disc is in an ideal interval range at the moment;
(3) if the data acquisition and operation system judges that: n3 is not less than n3+ delta n and h is more than h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the loading pressure P of the grinding roller is increased through an eighth monitoring point by the data acquisition and operation system but cannot exceed the maximum loading pressure value, the feeding amount W of the feeding system is prompted to be reduced, and if the relative zero point speed is still in a deviation state, the running frequency f of the main motor is increased through a first monitoring point but cannot exceed the maximum running frequency;
(4) if the data acquisition and operation system judges that: n3 is more than or equal to n3+ delta n, h is less than h 3-delta h, the deviation of the relative zero point speed of the roller disc is prompted, the loading pressure P of the grinding roller is reduced by the data acquisition and operation system through an eighth monitoring point but cannot be less than the minimum loading pressure value, the feeding system is prompted to increase the feeding amount W, and if the relative zero point speed is still in a deviation state, the running frequency f of the main motor is reduced by the first monitoring point but cannot be less than the minimum running frequency;
(5) if the data acquisition and operation system judges that: n is more than n3+ delta n, h is more than or equal to h 3-delta h and less than or equal to h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the running frequency f of the main motor is reduced through a first monitoring point but cannot exceed the maximum frequency set value by the data acquisition and operation system, and if the relative zero point speed is still in a deviation state, the loading pressure P of the grinding roller is reduced through an eighth monitoring point but cannot be smaller than the minimum loading pressure value;
(6) if the data acquisition and operation system judges that: n is more than n3+ delta n, h is more than h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system reduces the running frequency f of the main motor through a first monitoring point but cannot exceed the maximum frequency set value and prompts the feeding system to reduce the feeding amount W, and if the relative zero point speed is still in a deviation state, the loading pressure P of the grinding roller is increased through an eighth monitoring point but cannot exceed the maximum loading pressure value;
(7) if the data acquisition and operation system judges that: n is more than n3+ delta n and h is less than h 3-delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system reduces the running frequency f of the main motor through a first monitoring point but cannot be less than a minimum frequency set value and prompts the feedback to the feeding system to increase the feeding amount W, and if the relative zero point speed is still in a deviation state, the loading pressure P of the grinding roller is reduced through an eighth monitoring point but cannot be less than the minimum loading pressure value;
(8) if the data acquisition and operation system judges that: n is less than n3, h is more than or equal to h 3-delta h is more than or equal to h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system improves the running frequency f of the main motor through a first monitoring point but cannot exceed the maximum frequency set value, reduces the loading pressure P of the grinding roller through an eighth monitoring point but cannot be less than the minimum loading pressure value, and if the relative zero point speed is still in a deviation state, the feeding system is prompted to increase the feeding amount W;
(9) if the data acquisition and operation system judges that: n is less than n3, h is more than h3+ delta h, the deviation of the relative zero point speed of the roller disc is prompted, the data acquisition and operation system increases the running frequency f of the main motor through a first monitoring point but cannot exceed the maximum frequency set value, increases the loading pressure P of the grinding roller through an eighth monitoring point but cannot exceed the maximum loading pressure value, and if the relative zero point speed is still in a deviation state, the feeding system is prompted to reduce the feeding amount W;
(10) if the data acquisition and operation system judges that: n is less than n3, h is less than h 3-delta h, the deviation of the relative zero point speed of the roller disc is prompted, the operation frequency of a main motor of a first monitoring point is increased by f but cannot exceed a maximum frequency set value, the loading pressure P of the grinding roller is reduced by an eighth monitoring point but cannot be less than a minimum loading pressure value, and if the relative zero point speed is still in a deviation state, the feeding system is prompted to increase the feeding amount W;
(11) if the operating frequency of the main motor changes, all logic judgment of n3 needs to be recalculated, whether the feedback values of the second monitoring point, the third monitoring point, the fourth monitoring point, the fifth monitoring point, the sixth monitoring point, the seventh monitoring point, the ninth monitoring point and the tenth monitoring point are within a set range or not is monitored in real time, and if the feedback values exceed the set range, an interlocking reaction is carried out.
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| CN112916190A (en) * | 2021-01-19 | 2021-06-08 | 桂林鸿程矿山设备制造有限责任公司 | Vertical type flour mill loading pressure control system and method and storage medium |
| CN213700122U (en) * | 2020-10-13 | 2021-07-16 | 南京凯盛国际工程有限公司 | Vertical mill for producing machine-made sand |
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| JP2011088115A (en) * | 2009-10-26 | 2011-05-06 | Ihi Corp | Vertical roller mill, and method for detecting wear of pressure roller in vertical roller mill |
| CN102151605A (en) * | 2011-03-17 | 2011-08-17 | 浙江大学 | Advanced control method and system for vertical mill based on model identification and predictive control |
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