阅读说明：本技术 一种辊道窑烧成周期控制方法 (Firing period control method for roller kiln ) 是由 龙威舜 蓝万聪 冷元星 陈水福 于 2021-08-12 设计创作，主要内容包括：本发明公开了一种辊道窑烧成周期控制方法,通过结果导向法计算第一个变频器的变频频率P-(1),首先输入辊道窑要运行的设定周期T-(设定),然后确定P-(1)的精确度的数位和最大数位的取值范围,从P-(1)的最大数位的取值范围内从小到大依次选取该数位上的值,然后将该值作为P-(1)的设定值,然后输入到步骤S3中,得出计算周期T-(计算),当出现代入计算得到的计算周期T-(计算)小于设定周期T-(设定),则确定该值为P-(1)最大位数上的值,否则继续进行选取从小到大依次选取该数位上的值；P-(1)的最大数位和最小数位之间的值的选取方法和最大数位上的值的选取方法一样；当确定好最小数位之前的所有数位上的值之后,最后确定最小数位上的值。(The invention discloses a firing period control method of a roller kiln, which calculates the frequency conversion frequency P of a first frequency converter by a result guiding method 1 Firstly, inputting a set period T for the roller kiln to operate Setting up Then determining P 1 The value range of the precision digit and the maximum digit of (2) from P 1 The value of the maximum digit is selected from small to large in turn from the value range of the maximum digit, and then the value is taken as P 1 Is inputted to step S3, the calculation period T is obtained Computing When the calculation period T obtained by substituting calculation occurs Computing Less than a set period T Setting up Then the value is determined to be P 1 Value on maximum digit, otherwise proceedSelecting values on the digit from small to large; p 1 The method of selecting the value between the maximum digit and the minimum digit is the same as the method of selecting the value on the maximum digit; after determining the values on all digits before the least digit, the value on the least digit is finally determined.)

1. A firing period control method for a roller kiln comprises a plurality of sections of box bodies, wherein a transmission roller rod for conveying ceramic tiles and a motor for driving the transmission roller rod to rotate are arranged in the box bodies, and each motor controls the rotating speed and the rotating direction of one or more transmission roller rods, and is characterized by comprising the following steps:

s1, each motor or a plurality of motors are correspondingly connected with a frequency converter, the frequency of the frequency converter is adjusted to control the positive and negative rotation and the rotation speed of the connected motors, the roller kiln is correspondingly divided into kiln sections with the same number as the frequency converters, each frequency converter corresponds to one kiln section, each kiln section drives a transmission roller rod to rotate through the motor so as to enable the kiln section to correspond to one transmission speed, and the transmission speed V of the kiln section corresponding to each frequency converter is calculated;

s2, setting a frequency difference between two adjacent frequency converters, and along the direction from the inlet to the outlet of the roller kiln, obtaining the frequency conversion frequency of each frequency converter by adding the frequency difference between the two frequency converters to the frequency conversion frequency of the last frequency converter, wherein the frequency conversion frequency corresponding to the first kiln section of the roller kilnFrequency conversion frequency of the device is P₁Calculating the transmission speed of the corresponding kiln section according to the frequency of each frequency converter;

s3, calculating a firing period T of the whole roller kiln, wherein the period T is the cumulative sum of the length of the kiln section controlled by each section of frequency converter and the corresponding transmission speed of the kiln section;

s4, calculating the frequency conversion frequency P of the first frequency converter in the step S3 by a result-oriented method₁Firstly, inputting a set period T for the roller kiln to operate_{Setting up}Then determining P₁The value range of the precision digit and the maximum digit of (2) from P₁The value of the maximum digit is selected from small to large in turn from the value range of the maximum digit, and then the value is taken as P₁Is inputted to step S3, the calculation period T is obtained_ComputingWhen the calculation period T obtained by substituting calculation occurs_ComputingLess than a set period T_{Setting up}Then the value is determined to be P₁If not, continuing to select the values of the digits from small to large; p₁The method of selecting the value between the maximum digit and the minimum digit is the same as the method of selecting the value on the maximum digit; after determining the values of all digits before the minimum digit, the value of the minimum digit is finally determined, and when determining the value of the minimum digit, the values between the two ends of the critical point need to be judged, and the occurrence calculation period T is selected_ComputingAnd setting the period T_{Setting up}The value at which the absolute value of the difference is the smallest, thereby determining the value at the smallest digit;

s5, obtaining the frequency conversion frequency P of the first frequency converter based on the step S4₁And then sequentially calculating the frequency conversion frequency of the subsequent frequency converter according to the frequency difference set between the two adjacent frequency converters, inputting all the frequency conversion frequencies into the respective corresponding frequency converters, and controlling the respective motors to move through the frequency converters so as to enable the roller kiln to perform periodic movement.

2. The method for controlling the firing cycle of a roller kiln as claimed in claim 1, wherein in step S1, the number of the motors is n, the number of the frequency converters is n-m, and the number of the frequency converters is n-mThe lengths of the kiln sections corresponding to the frequency converters at different positions of the roller kiln in the length direction are L in sequence₁、L₂、L₃.....L_n-mThe calculation formula of the transmission speed V of the kiln section corresponding to each frequency converter is as follows:

V＝a*P*S；

the method comprises the following steps that S is a transmission ratio, under the condition that a motor, a transmission roller rod and a chain wheel of a roller kiln are determined, the transmission ratio S is a constant obtained through the motion relation of a motor gear, the chain wheel and the transmission roller rod, a is an adjustment coefficient used for adjusting and correcting the transmission ratio S used by each kiln section pair, the adjustment coefficient is also a constant, and P is the frequency conversion frequency of a frequency converter corresponding to each kiln section; from this, the firing cycle T of the entire roller kiln in step S3 is calculated as:

T＝L₁/V₁+L₂/V₂+...+L_n-m/V_n-m；

T＝L₁/(a*S*P₁)+L₂/(a*S*P₂)+...+L_n-m/(a*S*P_n-m)。

3. the method for controlling the firing cycle of a roller kiln as claimed in claim 2, wherein the frequency difference between two adjacent frequency converters in step S2 is set as D, and the frequency difference between two adjacent frequency converters along the inlet-outlet direction of the roller kiln is D₁、D₂、D₃.....D_n-m(ii) a The frequency conversion frequency of each frequency converter can be converted into P₁、P₁+D₁、P₂+D₂、P₃+D₃.....P_n-m+1+D_n-m+1The firing period T of the whole roller kiln is as follows:

T＝L₁/(a*S*P₁)+L₂/{a*S*(P₁+D₁)}+...+L_n-m/{a*S*(P_n-m-1+D_n-m-1)}

since L, S, a is a known constant, D₁....D_n-m-1For the set value, the above formula is converted by the frequency difference as follows:

T＝L₁/(a*S*P₁)+L₂/{a*S*(P₁+D₁)}+...+L_n-m/{a*S*(P₁+D₁+…+D_n-m-1)}；

the calculation period T in the step S4_ComputingThe calculation formula of (a) is as follows:

T_computing＝L₁/(a*S*P_{1 test})+L₂/{a*S*(P_{1 test}+D₁)}+...L_n-m/{a*S*(P_{1 test}+D₁+…+D_n-m-1)}；

Wherein P is_{1 test}For determining P in step S4₁Test values formed by values of different digits are selected.

4. The method for controlling the firing cycle of a roller kiln as claimed in claim 3, wherein P is P₁The value range of the maximum digit of (1) is 1-6.

5. Method for controlling firing cycle of roller kiln according to claim 3 or 4, characterized in that said variable frequency P₁The value range of the digits after the maximum digit is 0-9.

6. The method for controlling the firing cycle of a roller kiln as claimed in claim 5, wherein in step S4, the frequency conversion frequency P of the frequency converter corresponding to the first stage of the kiln is determined₁The precision of (1) is three bits including ten bits, one bit and one bit after the decimal point.

7. The method for controlling the firing cycle of a roller kiln as claimed in claim 6, wherein the step S4 is to determine the frequency P of the first frequency converter₁Is XY.Z, P₁The value determination method at each bit number of (1) is as follows:

a1 setting period T for roller kiln to run_{Setting up}，

a2, selecting X value of 1-6, and adding P₁According to P_{1 test}＝10Hz、P_{1 test}＝20Hz、P_{1 test}＝30Hz、P_{1 test}＝40Hz、P_{1 measurementTest for}＝50Hz、P_{1 test}The sequence of 60Hz is input into the calculation formula T_ComputingIn (1) to yield T_ComputingUntil T appears_ComputingLess than T_{Setting up}Then determine P at this time_{1 test}The value of the ten bits is the X value, the next round of calculation is carried out, and the Y value of the one bit is determined;

a3, after determining the value of X, from P_{1 test}In the order of X0-X9 Hz, P is sequentially increased from smaller to larger_{1 test}Is input into a calculation formula T_ComputingIn (1) to yield T_ComputingUntil T appears_ComputingLess than T_{Setting up}Then determine P at this time_{1 test}The value on the bit of (a) is the Y value;

a4, after determination of XY values, from P_{1 test}Sequentially adding P from small to large in XY.0-XY.9 Hz_{1 test}Is input into a calculation formula T_ComputingIn (1) to yield T_ComputingUntil T appears_ComputingLess than T_{Setting up}When T is present_ComputingLess than T_{Setting up}If so, continuously judging whether the absolute value of the difference value between the calculation period obtained by the current test frequency and the set period is greater than the absolute value of the difference value between the calculation period obtained by the current test frequency and the set period after the current test frequency is plus 0.1, if so, taking the Z +1 on the current test frequency as a determined Z value, and if not, taking the Z value on the current test frequency as a determined Z value;

a5, frequency conversion frequency P of frequency converter corresponding to the first stage kiln₁After the determination is good, the sequence is as P₁、P₁+D₁、P₂+D₂、P₃+D₃.....P_n-m+1+D_n-m+1The frequency conversion frequency of the subsequent frequency converter is calculated.

Technical Field

The invention belongs to the field of kiln equipment control, and particularly relates to a firing period control method for a roller kiln.

Background

The conventional ceramic roller kiln realizes the adjustment of the period of the kiln by adjusting the frequency of a frequency converter to control a transmission motor, the roller kiln has an operation period in the operation process, and when the operation period of the roller kiln needs to be changed, the rotation speed of the motor needs to be adjusted by adjusting the frequency converter, so that the operation period of the roller kiln is further changed.

When the actual kiln is debugged, on the basis of the original running period, the period T of the roller kiln is reset, then the frequency P1 value is calculated by a certain calculation method, and then the frequency value of each section is calculated, the currently widely adopted method is to transmit the frequency change through the period change rate K, so as to calculate the frequency of each section of the frequency converter, as shown in the following formula: the target period T_{Setting up}With the existing period T_{Operation of}Is conducted to the target set frequency P_{1 setting}And operating frequency P_{1 operation}Thereby calculating the frequency of each frequency converter.

K＝T_{Setting up}/T_{Operation of}

P_{1 setting}＝P_{1 operation}/K

P_{2 setting}＝P_{1 setting}+D₁

P_{3 setting}＝P_{2 setting}+D₂

P_{n-m is set}＝P_{n-m-1 is set}+D_n-m-1

T_{Operation of}＝L₁/(a*S*P_{1 operation})+L₂/{a*S*(P_{1 operation}+D₁)}+…+L_n-m/{a*S*(P_{1 operation}+D₁+…+D_n-m-1)}

T_{Setting up}＝L₁/(a*S*P_{1 setting})+L₂/{a*S*(P_{1 setting}+D₁)}+…+L_n-m/{a*S*(P_{1 setting}+D₁+…+D_n-m-1)}

Existing algorithms such as formula T_{Operation of}And T_{Setting up}By T_{Setting up}Divided by T_{Operation of}If there is no frequency difference D between the frequency converters, then P is obtained_{1 setting}The frequency difference D is consistent with the actual requirement, but the frequency difference D exists between the frequencies of the frequency converters due to the process requirement in the actual production, and the target period T is determined_{Setting up}With the existing period T_{Operation of}The frequency of the frequency converter is calculated by the method, and after the frequency is downloaded by the frequency converter and the set frequency conversion frequency is operated, the T fed back is obtained_{Operation of}And a set target value T_{Setting up}The difference is large, when the frequency difference is large, the error calculated by the method is large, generally at least 2 minutes, and when the frequency difference is large, the error is large, which brings great inconvenience to actual production, and further causes incomplete firing of ceramics in the roller kiln.

Disclosure of Invention

One of the objectives of the present invention is to provide a method for controlling the firing period of a roller kiln, so as to solve the above technical problems, and to obtain a frequency value of the first frequency converter closest to the requirement by using a result-oriented principle, combining an infinite approach principle, and designing a result-oriented method to continuously reduce the difference between the calculation period and the set period.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a firing period control method for a roller kiln comprises a plurality of sections of box bodies, wherein a transmission roller rod for conveying ceramic tiles and a motor for driving the transmission roller rod to rotate are arranged in the box bodies, and each motor controls the rotating speed and the rotating direction of one or more transmission roller rods, and is characterized by comprising the following steps:

s1, each motor or a plurality of motors are correspondingly connected with a frequency converter, the frequency of the frequency converter is adjusted to control the positive and negative rotation and the rotation speed of the connected motors, the roller kiln is correspondingly divided into kiln sections with the same number as the frequency converters, each frequency converter corresponds to one kiln section, each kiln section drives a transmission roller rod to rotate through the motor so as to enable the kiln section to correspond to one transmission speed, and the transmission speed V of the kiln section corresponding to each frequency converter is calculated;

s2, setting a frequency difference between two adjacent frequency converters, wherein the frequency conversion frequency of each frequency converter is obtained by adding the frequency difference between the two frequency converters to the frequency conversion frequency of the last frequency converter along the direction from the inlet to the outlet of the roller kiln, and the frequency conversion frequency of the frequency converter corresponding to the first kiln section of the roller kiln is P₁Calculating the transmission speed of the corresponding kiln section according to the frequency of each frequency converter;

s3, calculating a firing period T of the whole roller kiln, wherein the period T is the cumulative sum of the length of the kiln section controlled by each section of frequency converter and the corresponding transmission speed of the kiln section;

s4, calculating the frequency conversion frequency P of the first frequency converter in the step S3 by a result-oriented method₁Firstly, inputting a set period T for the roller kiln to operate_{Setting up}Then determining P₁The value range of the precision digit and the maximum digit of (2) from P₁The value of the maximum digit is selected from small to large in turn from the value range of the maximum digit, and then the value is taken as P₁Is inputted to step S3, the calculation period T is obtained_ComputingWhen the calculation period T obtained by substituting calculation occurs_ComputingLess than a set period T_{Setting up}Then the value is determined to be P₁If not, continuing to select the values of the digits from small to large; p₁The method of selecting the value between the maximum digit and the minimum digit is the same as the method of selecting the value on the maximum digit; after determining the values of all digits before the minimum digit, the value of the minimum digit is finally determined, and when determining the value of the minimum digit, the values between the two ends of the critical point need to be judged, and the occurrence calculation period T is selected_ComputingAnd setting the period T_{Setting up}The value at which the absolute value of the difference is the smallest, thereby determining the value at the smallest digit;

s5, based on the stepsStep S4 is to obtain the frequency P of the first frequency converter₁And then sequentially calculating the frequency conversion frequency of the subsequent frequency converter according to the frequency difference set between the two adjacent frequency converters, inputting all the frequency conversion frequencies into the respective corresponding frequency converters, and controlling the respective motors to move through the frequency converters so as to enable the roller kiln to perform periodic movement.

Preferably, in step S1, the number of the motors is n, the number of the frequency converters is n-m, and the lengths of the kiln sections corresponding to the frequency converters at different positions along the length direction of the roller kiln are L in sequence₁、L₂、L₃.....L_n-mThe calculation formula of the transmission speed V of the kiln section corresponding to each frequency converter is as follows:

V＝a*P*S；

the method comprises the following steps that S is a transmission ratio, under the condition that a motor, a transmission roller rod and a chain wheel of a roller kiln are determined, the transmission ratio S is a constant obtained through the motion relation of a motor gear, the chain wheel and the transmission roller rod, a is an adjustment coefficient used for adjusting and correcting the transmission ratio S used by each kiln section pair, the adjustment coefficient is also a constant, and P is the frequency conversion frequency of a frequency converter corresponding to each kiln section; from this, the firing cycle T of the entire roller kiln in step S3 is calculated as:

T＝L₁/V₁+L₂/V₂+...+L_n-m/V_n-m；

T＝L₁/(a*S*P₁)+L₂/(a*S*P₂)+...+L_n-m/(a*S*P_n-m)。

preferably, in step S2, the frequency difference between two adjacent frequency converters is D, and along the direction from the inlet to the outlet of the roller kiln, the frequency difference between two adjacent frequency converters is D sequentially₁、D₂、D₃.....D_h-m(ii) a The frequency conversion frequency of each frequency converter can be converted into P₁、P₁+D₁、P₂+D₂、P₃+D₃.....P_n-m+1+D_n-m+1The firing period T of the whole roller kiln is as follows:

T＝L₁/(a*S*P₁)+L₂/{a*S*(P₁+D₁)}+...+L_n-m/{a*S*(P_n-m-1+D_n-m-1)}

since L, S, a is a known constant, D₁....D_n-m-1For the set value, the above formula is converted by the frequency difference as follows:

T＝L₁/(a*S*P₁)+L₂/{a*S*(P₁+D₁)}+...+L_n-m/{a*S*(P₁+D₁+…+D_n-m-1)}；

the calculation period T in the step S4_ComputingThe calculation formula of (a) is as follows:

T_computing＝L₁/(a*S*P_{1 test})+L₂/{a*S*(P_{1 test}+D₁)}+...L_n-m/{a*S*(P_{1 test}+D₁+…+D_n-m-1)}；

Wherein P is_{1 test}For determining P in step S4₁Test values formed by values of different digits are selected.

Preferably, P is₁The value range of the maximum digit of (1) is 1-6.

Preferably, the frequency conversion frequency P₁The value range of the digits after the maximum digit is 0-9.

Preferably, in step S4, the frequency conversion frequency P of the frequency converter corresponding to the first stage of the kiln is determined₁The precision of (1) is three bits including ten bits, one bit and one bit after the decimal point.

Preferably, in step S4, the conversion frequency P of the first frequency converter is determined₁Is XY.Z, P₁The value determination method at each bit number of (1) is as follows:

a1 setting period T for roller kiln to run_{Setting up}，

a2, selecting X value of 1-6, and adding P₁According to P_{1 test}＝10Hz、P_{1 test}＝20Hz、P_{1 test}＝30Hz、P_{1 test}＝40Hz、P_{1 test}＝50Hz、P_{1 test}The sequence of 60Hz is input into the calculation formula T_ComputingIn (1) to yield T_ComputingUntil it is outNow T_ComputingLess than T_{Setting up}Then determine P at this time_{1 test}The value of the ten bits is the X value, the next round of calculation is carried out, and the Y value of the one bit is determined;

a3, after determining the value of X, from P_{1 test}In the order of X0-X9 Hz, P is sequentially increased from smaller to larger_{1 test}Is input into a calculation formula T_ComputingIn (1) to yield T_ComputingUntil T appears_ComputingLess than T_{Setting up}Then determine P at this time_{1 test}The value on the bit of (a) is the Y value;

a4, after determination of XY values, from P_{1 test}Sequentially adding P from small to large in XY.0-XY.9 Hz_{1 test}Is input into a calculation formula T_ComputingIn (1) to yield T_ComputingUntil T appears_ComputingLess than T_{Setting up}When T is present_ComputingLess than T_{Setting up}If so, continuously judging whether the absolute value of the difference value between the calculation period obtained by the current test frequency and the set period is greater than the absolute value of the difference value between the calculation period obtained by the current test frequency and the set period after the current test frequency is plus 0.1, if so, taking the Z +1 on the current test frequency as a determined Z value, and if not, taking the Z value on the current test frequency as a determined Z value;

a5, frequency conversion frequency P of frequency converter corresponding to the first stage kiln₁After the determination is good, the sequence is as P₁、P₁+D₁、P₂+D₂、P₃+D₃.....P_n-m+1+D_n-m+1The frequency conversion frequency of the subsequent frequency converter is calculated.

Has the advantages that:

the firing period control method of the roller kiln can solve the problems that in debugging production of the roller kiln, the actual feedback operation period is inaccurate and has a large error with the preset setting period after the operation frequency value is converted into the setting frequency and the operation period is downloaded by taking the change rate of the setting period compared with the operation period as a ratio. The invention adopts the result guiding principle and combines the infinite approaching principle, the difference value of the calculation period and the set period obtained by testing the frequency is continuously reduced by designing the result as the guide, and the frequency conversion frequency value of the first frequency converter closest to the requirement is finally obtained.

Drawings

FIG. 1 is a schematic structural diagram of a roller kiln in the method for controlling the firing cycle of the roller kiln according to the present invention;

FIG. 2 is a schematic diagram showing the frequency difference between different frequency converters in the method for controlling the firing cycle of a roller kiln according to the present invention;

FIG. 3 is an algorithm chart of the firing cycle control method of the roller kiln of the invention.

Detailed Description

The technical solution of the present invention is described in detail with specific examples below.

Example 1

As shown in fig. 1 and 2, a firing cycle control method for a roller kiln, the roller kiln comprising a plurality of box bodies, wherein a driving roller for conveying ceramic tiles and a motor for driving the driving roller to rotate are arranged in each box body, and each motor controls the rotation speed and the rotation direction of one or more driving rollers, the firing cycle control method comprises the following steps:

s1, each motor or a plurality of motors are correspondingly connected with a frequency converter, the frequency of the frequency converter is adjusted to control the positive and negative rotation and the rotation speed of the connected motors, the roller kiln is correspondingly divided into kiln sections with the same number as the frequency converters, each frequency converter corresponds to one kiln section, each kiln section drives a transmission roller rod to rotate through the motor so as to enable the kiln section to correspond to one transmission speed, and the transmission speed V of the kiln section corresponding to each frequency converter is calculated;

s2, setting a frequency difference between two adjacent frequency converters, wherein the frequency conversion frequency of each frequency converter passes through the frequency conversion frequency of the last frequency converter and the frequency conversion frequency of the two frequency converters along the direction from the inlet to the outlet of the roller kilnThe frequency difference between the first kiln section and the second kiln section is obtained, and the frequency conversion frequency of a frequency converter corresponding to the first kiln section of the roller kiln is P₁Calculating the transmission speed of the corresponding kiln section according to the frequency of each frequency converter;

s3, calculating a firing period T of the whole roller kiln, wherein the period T is the cumulative sum of the length of the kiln section controlled by each section of frequency converter and the corresponding transmission speed of the kiln section;

s4, calculating the frequency conversion frequency P of the first frequency converter in the step S3 by a result-oriented method₁Firstly, inputting a set period T for the roller kiln to operate_{Setting up}Then determining P₁The value range of the precision digit and the maximum digit of (2) from P₁The value of the maximum digit is selected from small to large in turn from the value range of the maximum digit, and then the value is taken as P₁Is inputted to step S3, the calculation period T is obtained_ComputingWhen the calculation period T obtained by substituting calculation occurs_ComputingLess than a set period T_{Setting up}Then the value is determined to be P₁If not, continuing to select the values of the digits from small to large; p₁The method of selecting the value between the maximum digit and the minimum digit is the same as the method of selecting the value on the maximum digit; after determining the values of all digits before the minimum digit, the value of the minimum digit is finally determined, and when determining the value of the minimum digit, the values between the two ends of the critical point need to be judged, and the occurrence calculation period T is selected_ComputingAnd setting the period T_{Setting up}The value at which the absolute value of the difference is the smallest, thereby determining the value at the smallest digit;

s5, obtaining the frequency conversion frequency P of the first frequency converter based on the step S4₁And then sequentially calculating the frequency conversion frequency of the subsequent frequency converter according to the frequency difference set between the two adjacent frequency converters, inputting all the frequency conversion frequencies into the respective corresponding frequency converters, and controlling the respective motors to move through the frequency converters so as to enable the roller kiln to perform periodic movement.

In step S1, the number of the motors is n, the number of the frequency converters is n-m, and the frequency converter pairs at different positions along the length direction of the roller kilnThe length of the corresponding kiln section is L in sequence₁、L₂、L₃.....L_n-mThe calculation formula of the transmission speed V of the kiln section corresponding to each frequency converter is as follows:

V＝a*P*S；

the method comprises the following steps that S is a transmission ratio, under the condition that a motor, a transmission roller rod and a chain wheel of a roller kiln are determined, the transmission ratio S is a constant obtained through the motion relation of a motor gear, the chain wheel and the transmission roller rod, a is an adjustment coefficient used for adjusting and correcting the transmission ratio S used by each kiln section pair, the adjustment coefficient is also a constant, and P is the frequency conversion frequency of a frequency converter corresponding to each kiln section; from this, the firing cycle T of the entire roller kiln in step S3 is calculated as:

T＝L₁/V₁+L₂/V₂+...+L_n-m/V_n-m；

T＝L₁/(a*S*P₁)+L₂/(a*S*P₂)+...+L_n-m/(a*S*P_n-m)。

setting the frequency difference between two adjacent frequency converters in the step S2 to be D, wherein the frequency difference between every two adjacent frequency converters is D in sequence along the direction from the inlet to the outlet of the roller kiln₁、D₂、D₃.....D_n-m(ii) a The frequency conversion frequency of each frequency converter can be converted into P₁、P₁+D₁、P₂+D₂、P₃+D₃.....P_n-m+1+D_n-m+1The firing period T of the whole roller kiln is as follows:

T＝L₁/(a*S*P₁)+L₂/{a*S*(P₁+D₁)}+...+L_n-m/{a*S*(P_n-m-1+D_n-m-1)}

since L, S, a is a known constant, D₁....D_n-m-1For the set value, the above formula is converted by the frequency difference as follows:

T＝L₁/(a*S*P₁)+L₂/{a*S*(P₁+D₁)}+...+L_n-m/{a*S*(P₁+D₁+…+D_n-m-1)}；

said step (c) isCalculation period T in S4_ComputingThe calculation formula of (a) is as follows:

T_computing＝L₁/(a*S*P_{1 test})+L₂/{a*S*(P_{1 test}+D₁)}+...L_n-m/{a*S*(P_{1 test}+D₁+…+D_n-m-1)}；

Wherein P is_{1 test}For determining P in step S4₁Test values formed by values of different digits are selected.

Preferably, P is₁The value range of the maximum digit of (1) is 1-6. The frequency conversion frequency P₁The value range of the digits after the maximum digit is 0-9. In step S4, the frequency conversion frequency P of the frequency converter corresponding to the first stage kiln section is determined₁The precision of (1) is three bits including ten bits, one bit and one bit after the decimal point. According to T_ComputingThe formula shows that the larger the frequency is, the smaller the period is, so that the running frequency of the ceramic roller kiln transmission frequency converter in actual operation has a certain range of 10-70 Hz; so that P can be substituted₁The accuracy is one digit after the decimal point, namely XY.Z.

As shown in fig. 3, the step S4 determines the conversion frequency P of the first frequency converter₁Is XY.Z, P₁The value determination method at each bit number of (1) is as follows:

a1 setting period T for roller kiln to run_{Setting up}，

a2, selecting X value of 1-6, and adding P₁According to P_{1 test}＝10Hz、P_{1 test}＝20Hz、P_{1 test}＝30Hz、P_{1 test}＝40Hz、P_{1 test}＝50Hz、P_{1 test}The sequence of 60Hz is input into the calculation formula T_ComputingIn (1) to yield T_ComputingUntil T appears_ComputingLess than T_{Setting up}Then determine P at this time_{1 test}The value of the ten bits is the X value, the next round of calculation is carried out, and the Y value of the one bit is determined;

a3, after determining the value of X, from P_{1 test}In the order of X0-X9 Hz, P is sequentially increased from smaller to larger_{1 test}Is input into a calculation formula T_ComputingIn (1) to yield T_ComputingUntil T appears_ComputingLess than T_{Setting up}Then determine P at this time_{1 test}The value on the bit of (a) is the Y value;

a4, after determination of XY values, from P_{1 test}Sequentially adding P from small to large in XY.0-XY.9 Hz_{1 test}Is input into a calculation formula T_ComputingIn (1) to yield T_ComputingUntil T appears_ComputingLess than T_{Setting up}When T is present_ComputingLess than T_{Setting up}If so, continuously judging whether the absolute value of the difference value between the calculation period obtained by the current test frequency and the set period is greater than the absolute value of the difference value between the calculation period obtained by the current test frequency and the set period after the current test frequency is plus 0.1, if so, taking the Z +1 on the current test frequency as a determined Z value, and if not, taking the Z value on the current test frequency as a determined Z value;

at the judgment of P₁The decimal place of (2) is determined by determining the value of both ends of the decimal place, i.e. when T occurs_ComputingLess than T_{Setting up}Then, judge | T_ComputingA T_{Setting up}|＞|T_{Calculation (frequency +0.1)}-T_{Setting up}If the formula is true, then the current test frequency P₁+0.1 is the final setting P₁If the formula is not satisfied, the current test frequency P₁For final setting P₁. The decimal value determined in this way ensures P₁Sufficient accuracy to finally run P₁And after other frequency values, the error between the running period and the set period is greatly reduced.

a5, frequency conversion frequency P of frequency converter corresponding to the first stage kiln₁After the determination is good, the sequence is as P₁、P₁+D₁、P₂+D₂、P₃+D₃.....P_n-m+1+D_n-m+1The frequency conversion frequency of the subsequent frequency converter is calculated.

The method combines the result guiding principle with the infinite approaching principle, continuously reduces the difference value of the calculation period and the set period obtained by testing the frequency by taking the result as the guide, finally obtains the frequency value of the first frequency converter which is closest to the requirement, and enables the frequency value to be accurate to one bit behind a decimal point.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.