Balanced feeding control method and system for redrying tobacco leaves based on multi-line feeding

Abstract

The application discloses a kind of based on the equalization of feeding control method of re-drying tobacco leaf of multi-line feeding, comprising the following steps: providing several column transmission direction same's leaf laying belt, it is divided into two groups, left group and right group, the end of left group is provided with a left belt, the end of right group is provided with a right belt;Determine the placement position of each grade tobacco;The actual feeding amount of tobacco of each station frame tobacco is compared with theoretical feeding amount, and its ratio δ k is output to corresponding leaf laying personnel with percentage system;The tobacco of the left belt transmission and the tobacco of the right belt transmission are secondarily summarized.The control method carries out real-time detection, adjustment and control to the different grade tobacco longitudinal and horizontal mixed arrangement non-uniformity and stability that appear in re-drying tobacco feeding link.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of re-drying tobacco feeding, and particularly relates to a balanced feeding control method and system for re-drying tobacco based on multi-line feeding. BACKGROUND

[0002] Leaf re-drying is an intermediate link of tobacco production and cigarette manufacturing. With the development of cigarette manufacturing, cigarette manufacturers continuously improve the quality requirements for raw materials, and no longer stop at the control of physical indexes in the quality control of the leaf re-drying process. New requirements are proposed for the balanced stability of chemical indexes of re-dried tobacco. For leaf re-drying enterprises, new challenges are coming. Under the premise that the purity of tobacco selected in the raw tobacco sorting link is high, the uniformity and stability of mixed feeding of tobacco of various grades in the re-drying link directly determine the fluctuation of chemical indexes of processed tobacco in subsequent sections. The uniformity of leaf feeding is a key factor to realize the homogenization of the re-drying link. There are many factors affecting the uniformity of mixed feeding of tobacco, which restricts the development of re-drying enterprises to some extent. At present, most domestic re-drying enterprises only pay attention to the horizontal uniformity of mixed feeding of tobacco, and rarely pay attention to the vertical uniformity of mixed feeding of tobacco (the horizontal uniformity refers to the proportion accuracy of the material fed in unit time, and the vertical uniformity refers to the mixing uniformity of the material fed in unit time). The uniformity of mixed feeding of tobacco is crucial for re-drying enterprises to do homogenization processing, and can also promote the development of re-drying enterprises in the direction of homogenization.

[0003] Therefore, how to provide a feeding control method capable of solving the problems of uniformity and stability of mixed feeding in the feeding link of homogenization processing of re-dried tobacco has become a technical problem urgently to be solved by those skilled in the art. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a solution to the problems of uniformity and stability of mixed feeding in the feeding link of homogenization processing of re-dried tobacco. The present application provides real-time detection, adjustment and control of the vertical and horizontal uniformity and stability of mixed feeding of different grades of tobacco in the feeding link of re-dried tobacco. The specific technical solution is as follows:

[0005] The balanced feeding control method for re-dried tobacco based on multi-line feeding comprises the following steps:

[0006] A plurality of leaf-laying belts with the same transmission direction are provided, which are divided into two groups, a left group and a right group. The number of leaf-laying belts in the left group is different from or the same as the number of leaf-laying belts in the right group. Each leaf-laying belt in the left group has a left belt at its end for receiving tobacco leaves transmitted by all leaf-laying belts in the left group. The transmission direction of the left belt is perpendicular to the transmission direction of the leaf-laying belts in the left group. Each leaf-laying belt in the right group has a right belt at its end for receiving tobacco leaves transmitted by all leaf-laying belts in the right group. The transmission direction of the right belt is perpendicular to the transmission direction of the leaf-laying belts in the right group. The left belts are relative to the right belts and their ends are close to each other.

[0007] The total number of workstations at all leaf-laying conveyor belts is Q, with each workstation corresponding to one leaf-laying worker, resulting in a total of P leaf-laying workers. Each workstation has one basket of tobacco, and the placement of each basket of tobacco is B. x-w Where x is the leaf-laying line number corresponding to the leaf-laying belt, x = 1, 2, 3, ..., and w is the frame cigarette position number corresponding to the leaf-laying belt, w = 1, 2, 3, ...;

[0008] Sort all the tobacco leaves of each grade to be fed into the plant from highest to lowest according to the known grade percentage i%: a%, b%, c%, d%, e%, f%, ..., where i = a, b, c, d, e, f, ..., and ∑i% = 100%. The number of people assigned to lay the leaves for each grade is P*i%, rounded down to the nearest integer, ensuring that all values ​​are positive integers, and denoted as R. i And satisfying ΣR i =P;

[0009] Determine the placement of each grade of tobacco leaves: First, place the frame of tobacco leaves with the highest grade ratio in the position of the left group close to the right group or the right group close to the left group. Then, place the frame of tobacco leaves with decreasing grade ratios in the positions of the left group and the right group.

[0010] The actual amount of tobacco leaves fed into each workstation frame is compared with the theoretical amount that should be fed, and the ratio δ is calculated. k The output, presented as a percentage, is given to the relevant leaf-laying personnel, as follows:

[0011] Calculate the average hourly feed rate T for each grade of tobacco leaves based on the known processing flow rate L. i =L*i%;

[0012] The average feed rate R per person per hour for each grade of tobacco leaf laying position was calculated. Ti =T i / R i ;

[0013] The weight of the tobacco leaf in the frame is read once every interval time △t, and the weight of the tobacco leaf in the nth interval time n*△t is Z n(x-w) , and the weight of the frame in the (n+1)th interval time (n+1)*△t is Z (n+1)(x-w) , then the feeding amount of the frame at the B x-w position from the n*△t time to the (n+1)th time is K T(n+1)(x-w) =Z n(x-w) -Z (n+1)(x-w) ; wherein the unit of time △t is minute;

[0014] The total feeding amount K x-w of the tobacco leaf at the B T(x-w) position is calculated T(n+1)(x-w) , wherein n takes the value of 0, 1, 2, 3, …, and Z 0(x-w) =0 at the beginning, and no cumulative calculation is performed when K T(n+1)(x-w) is less than or equal to 0;

[0015] It is obtained that δ k =100*actual feeding amount of tobacco leaf / theoretical feeding amount

[0016] =100*(K T(x-w) / n*△t) / (R Ti / 60)

[0017] =6*10 5 *R i *ΣK T(n+1)(x-w) / (L*i*n*△t), the value δ k is used to prompt the progress of the tobacco leaf laying;

[0018] The tobacco leaf conveyed by the left belt and the tobacco leaf conveyed by the right belt are secondarily aggregated.

[0019] As preferred, the following steps are further included:

[0020] According to the feeding amount K T(x-w) , the feeding speed V T(x-w) of the tobacco leaf at the station is calculated =ΣK T(n+1)(x-w) / Σ△t;

[0021] According to the real-time weighing number of the frame at the station and the feeding speed, the remaining feeding time S T(x-w) of the frame at the station at any (n+1)th time is calculated =Z (n+1)(x-w) / V T(x-w) .

[0022] As preferred, the following steps are further included:

[0023] It is obtained that the total feeding amount of the tobacco leaf of the same grade is DTi =∑K T(x-w) ;

[0024] Calculate the percentage ratio δ of the actual amount of tobacco of each grade and the theoretical amount of tobacco after the time (n+1)*△t d :

[0025] δ d =100*actual amount of tobacco / amount of tobacco to be fed

[0026] =100*(D Ti / (n+1)*△t) / (T i / 60)

[0027] =6*10 5 *∑K T(x-w) / (L*i*(n+1)*△t), the value δ d is used for the laying progress of tobacco of the same grade.

[0028] As a preferred, a display screen is installed at the opposite side of each layering personnel (the other side of the layering belt), and the display screen displays the values δ k , S T(x-w) and δ d , and the preparation area displays the value S T(x-w) .

[0029] As a preferred, the method further comprises the following steps: providing a deviation range allowed by the values δ k and δ d , and if the corresponding value exceeds the corresponding deviation range, an alarm will be prompted.

[0030] As a preferred, when the proportion of tobacco of different grades on one of the layering belts reaches two or more, the tobacco is laid without superimposed cross feeding or with superimposed feeding, and when the superimposed feeding is used, the superimposed feeding is partial or complete.

[0031] As a preferred, the tobacco is subjected to height limiting treatment and cutting treatment in sequence at the end of each of the layering belts, and the tobacco after the cutting treatment enters the corresponding left belt and right belt respectively.

[0032] As a preferred, the method further comprises the following steps: performing a separation treatment on the tobacco after the secondary collection, and separating the tobacco into two parts, and the two parts are conveyed to the next process along different separation belts respectively.

[0033] The balanced feeding control method for redrying tobacco based on multi-line feeding provided by the application has the following technical effects:

[0034] When the tobacco leaves are placed in the frame, the tobacco leaves with the highest proportion of grades are placed in the middle, which is beneficial to the replacement of the frame (the frame to be placed is replaced after the tobacco leaves in the frame are laid out) and, from the perspective of the flow of tobacco leaves, the tobacco leaves with a smaller proportion of grades are placed at the bottom of the primary collection belt after being conveyed by the belt, so that their form is not easily changed during the conveying process to the secondary collection belt, which is beneficial to the uniform mixing of the secondary collection belt. On the same laying belt, the frames are placed from the distal end to the proximal end of the primary collection belt (the left belt and the right belt) according to the proportion of the grades of the tobacco leaves laid on the belt, so that the two types of tobacco leaves with the smallest proportion of grades are placed on the two side laying belts and close to the proximal end of the primary collection belt. During the laying process, for the tobacco leaves with the smallest proportion of grades, when several types of tobacco leaves with different proportions of grades are overlaid and laid, the thickness of the tobacco leaves laid on the belt close to the distal end of the primary collection belt or the presence or absence of the tobacco leaves can be used to adaptively adjust (more, less or no) the tobacco leaves with the smallest proportion of grades.

[0035] In addition, by the method, the ratio δ of the real-time feeding amount of the tobacco leaves of each station to the theoretical feeding amount of the tobacco leaves of the station k The data is provided in percentage form, so that the laying personnel of each station can timely adjust the speed of their laying to control the real-time cumulative deviation within the allowable range, and if the deviation exceeds the range, the warning light is used for warning. Therefore, the uniformity of the tobacco leaves can be ensured.

[0036] Further, the calculated value S T(x-w) The output is convenient for the personnel who pull the empty frame and the personnel who pull the frame to have a more accurate control of the replacement time, eliminates the waiting time, and improves the target orientation and work efficiency.

[0037] The data δ d The data is used to prompt whether the total laying speed of the personnel who lay the same grade of tobacco leaves is reasonable, so as to timely adjust and ensure the stability of the laying proportion of the grade of tobacco leaves, and eliminate the cumulative error caused by the difference in the individual feeding amount of the laying personnel.

[0038] Further, the same grade of frame tobacco is placed on the same side of the belt as much as possible, so that the speed of the feeding belt can be adjusted to ensure the feeding progress of the same grade of tobacco. If the feeding belt involves more than two grades of tobacco, adjusting the speed of the belt will affect the feeding progress of the two grades of tobacco. By placing the same grade of frame tobacco on the same side of the belt as much as possible, the longitudinal placement deviation caused by the interval crossing of various grades of tobacco is eliminated. By adjusting the same grade of frame tobacco to be placed on the same side of the belt, and then collecting the various grades of tobacco on the same side of the belt, the uniformity of the tobacco is realized, and the accuracy of the laying belt is reduced.

[0039] Further, when the grade of tobacco on a belt reaches more than two, cross feeding or superimposed feeding is beneficial to uniform mixing.

[0040] Further, by cutting the tobacco and mixing it on two production lines, the calculation range of the laying position is improved, and the controllable range and operability of the tobacco feeding ratio are further improved. For example, if two production lines are used for separate feeding, at most 16 grades of tobacco can be uniformly fed. When the tobacco is cut and mixed on two production lines, at most 32 grades of tobacco can be uniformly fed.

[0041] By setting a height limit at the end of the laying belt, the cutting equipment can be prevented from being blocked by tobacco with high thickness. The management range and difficulty of the management personnel are reduced, and the management personnel can observe whether the feeding ratio of the current grades of tobacco meets the requirements by observing the data displayed on the display screen, saving the management time cost. The target orientation of the laying speed of the laying personnel is improved.

[0042] For the same grade of tobacco on the same belt, only the laying thickness of the laying personnel needs to be controlled, reducing the requirement for the laying position accuracy. At the same time, the laying difficulty of the laying personnel is reduced, and the cumulative error caused by the individual differences of the laying personnel is eliminated.

[0043] For the case of laying multiple grades of tobacco on the same belt, the number of grades of tobacco laid on each belt will be reduced after the implementation of this method, reducing the laying difficulty and the waiting time of the laying action of the laying personnel.

[0044] For the same grade of tobacco on the same belt, only the laying thickness of the laying personnel needs to be controlled, reducing the requirement for the laying position accuracy. At the same time, the laying difficulty of the laying personnel is reduced, and the cumulative error caused by the individual differences of the laying personnel is eliminated.

[0045] The application also provides a corresponding control system, and the technical scheme is as follows.

[0046] The balanced feeding control system for redrying tobacco leaves based on multi-line feeding comprises:

[0047] A plurality of leaf laying belts with the same conveying direction are divided into two groups, a left group and a right group, the number of leaf laying belts in the left group is different from or the same as the number of leaf laying belts in the right group, the end of each leaf laying belt in the left group is provided with a left belt for receiving the tobacco leaves conveyed by all the leaf laying belts in the left group, the conveying direction of the left belt is perpendicular to the conveying direction of the leaf laying belts in the left group, the end of each leaf laying belt in the right group is provided with a right belt for receiving the tobacco leaves conveyed by all the leaf laying belts in the right group, the conveying direction of the right belt is perpendicular to the conveying direction of the leaf laying belts in the right group, and the left belt is relative to the right belt and the ends of the two belts are close to each other.

[0048] A plurality of workstations are arranged along the conveying direction of each leaf laying belt, a tobacco box is placed at each workstation, a weighing device is arranged at the position corresponding to each tobacco box, a display screen is arranged at the corresponding position of each workstation, the total number of workstations is Q, the total number of leaf laying personnel is P, and the placement position of each tobacco box is B x-w , wherein x is the leaf laying line number corresponding to the leaf laying belt, x = 1, 2, 3, …, w is the tobacco box position number corresponding to the leaf laying belt, w = 1, 2, 3, …, all the tobacco leaves of various grades to be fed are sorted from high to low according to the known grade proportion i%: a%, b%, c%, d%, e%, f% …, wherein i = a, b, c, d, e, f …, and Σi% = 100%; the allocated number of leaf laying personnel for each grade of tobacco leaves is the integer value of P*i%, which is a positive integer value, and is denoted as Ri, and satisfies ΣRi = P;

[0049] A first multi-grade tobacco leaf feeding calculation module is configured to compare the actual feeding amount and the theoretical feeding amount of the tobacco leaves in each workstation tobacco box, and calculate the ratio δ k of the actual feeding amount to the theoretical feeding amount.

[0050] According to the known processing flow L, the average feeding amount T i of each grade of tobacco leaves per hour is calculated as follows: T Ti = L*i%;

[0051] The average feeding amount R i of each grade of tobacco leaves per hour per person at the leaf laying position is calculated as follows: R i = T Ti / R i ;

[0052] The weight of the tobacco leaves in the frame is read once at every time interval Δt. Let Z be the weight of the tobacco leaves at the nth time interval n*Δt. n(x-w) The weight of the cigarette in the (n+1)th interval (n+1)*△t is Z. (n+1)(x-w) Then B x-w The amount of material fed into the frame at position n from time n*△t to time (n+1)*△t is K. T(n+1)(x-w) =Z n(x-w) -Z (n+1)(x-w) ; where the unit of time Δt is minutes;

[0053] Calculate B x-w The total amount of tobacco leaves fed at location K T(x-w) =ΣK T(n+1)(x-w) Where n takes values ​​of 0, 1, 2, 3..., and is initially set to Z. 0(x-w) =0, when K T(n+1)(x-w) When the value is less than or equal to 0, no cumulative calculation is performed;

[0054] We arrive at: δ k =100 * Actual amount of tobacco leaves fed / Theoretical amount of tobacco leaves to be fed

[0055] =100*(K) T(x-w) / n*△t) / (R Ti / 60)

[0056] =6*10 5 *R i *ΣK T(n+1)(x-w) / (L*i*n*△t), numerical value δ k Used to indicate the progress of leaf laying;

[0057] A secondary summing belt is disposed at the ends of the left belt and the right belt;

[0058] The control module is electrically connected to the weighing device, the display screen, and the first multi-level tobacco feeding calculation module. The weight information obtained by the weighing device is transmitted to the first multi-level tobacco feeding calculation module via the control module. The first multi-level tobacco feeding calculation module calculates the value δ. k The data is transmitted to the display screen via the control module.

[0059] Preferably, the system also includes a remaining feeding time calculation module, which is electrically connected to the control module and its calculation process is as follows:

[0060] Based on the amount of material K T(x-w) Calculate the feeding speed V of tobacco leaves at this station. T(x-w) =ΣK T(n+1)(x-w) / Σ△t;

[0061] According to the real-time weight of the frame tobacco and the feeding speed, the residual feeding time S of the frame tobacco at any (n+1)*△t moment is calculated T(x-w) = Z (n+1)(x-w) / V T(x-w) .

[0062] As preferred, a second multi-grade tobacco feeding calculation module is further included, which is electrically connected with the control module and the calculation process thereof is as follows:

[0063] The total feeding amount of the tobacco of the same grade is D Ti =ΣK T(x-w) ;

[0064] The percentage ratio δ of the actual feeding amount of the tobacco of each grade to the theoretical feeding amount after the passage of time at (n+1)*△t moment is calculated d :

[0065] δ d =100*actual feeding amount of tobacco / theoretical feeding amount of tobacco

[0066] =100*(D Ti / (n+1)*△t) / (T i / 60)

[0067] =6*10 5 *ΣK T(x-w) / (L*i*(n+1)*△t), the value δ d is used to prompt the laying progress of the tobacco of the same grade.

[0068] As preferred, a height limiting device and a cutting device are sequentially arranged at the end of each laying belt, the height limiting device is a horizontally adjustable rod, and the cutting device is a SLQD type double-path tobacco cutting machine.

[0069] As preferred, a distributing device is arranged at the end of the secondary collecting belt, the distributing device has two outlets respectively connected with two distributing belts in different conveying directions, and the distributing device is a reciprocating distributing belt or a harrow roller type distributing device.

[0070] The control system has the same technical effects as the above control method. BRIEF DESCRIPTION OF DRAWINGS

[0071] Figure 1 is a structural schematic diagram of part of a specific embodiment of the control system provided by the present application; wherein x-w B is the placement position of the frame tobacco, x is the laying line serial number corresponding to the laying belt, x takes the value of 1-8, w is the frame tobacco position serial number corresponding to the laying belt, and w takes the value of 1-4.

[0072] Figure 2This is a schematic diagram of the relevant structure of a single leaf-laying belt, where P 1-1 P 1-2 P 1-3 P 1-4 The label on the display screen corresponding to the corresponding cigarette pack;

[0073] Figure 3 This is a schematic diagram of a reciprocating material distribution belt according to a specific embodiment, where the arrow points to the conveying direction of the tobacco leaves.

[0074] Figure 4 This is a schematic diagram of the structure of a rake roller type material distribution device according to a specific embodiment. Multiple arrows represent the rotation direction of the rake roller and the conveying direction of the tobacco leaves, respectively.

[0075] Figures 1-2 The labels in the attached figures are as follows:

[0076] 1-8 are leaf-covered belts;

[0077] 9 is a height restriction device;

[0078] 10 is the cutting device;

[0079] 11 is the left belt, 12 is the right belt;

[0080] 13 is the secondary summary belt;

[0081] 14 and 16 are material distribution belts;

[0082] 15 is a material distribution device;

[0083] 17 and 18 are subsequent processing devices;

[0084] 19 is a reciprocating material distribution belt;

[0085] 20 represents a rake nail. Detailed Implementation

[0086] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0087] like Figures 1-2 As shown, Figure 1 This is a partial structural diagram of a specific embodiment of the control system provided by the present invention; wherein, B x-w The position of the cigarette frame is indicated by x, which is the leaf-laying line number corresponding to the leaf-laying belt. The value of x is 1-8. The position number of the cigarette frame corresponding to the leaf-laying belt is 1-4. Figure 2 This is a schematic diagram of the relevant structure of a single leaf-laying belt, where P 1-1 P 1-2 P 1-3 P 1-4 The label is for the corresponding display screen of the cigarette pack.

[0088] One specific embodiment, as shown in Figures 1-2 a double strip 6000 kg / h processing line (processing flow L is 12000 kg / h), 32 stations (Q is 32) are taken as an example for illustration, such as a batch of processed tobacco has 6 grades, which are C3F, C1F, C2F, X1F, X2F, B1F, and the grade proportion (i%) of the corresponding formula leaf processing is 45%, 20%, 18%, 10%, 6%, and 1% respectively.

[0089] The total number of leaf laying personnel (P) is 32, and the number of personnel allocated to each grade is determined as follows: P*i% is 14.4, 6.4, 5.76, 3.2, 1.92, and 0.32 respectively. After rounding (R i ), the corresponding values are 14, 6, 6, 3, 2, and 1 respectively, and ΣR i =P=32.

[0090] The laying positions of the tobacco leaves of each grade are determined in the order of the size of R i , and the laying positions B x-w are shown in Figure 1 , and the laying positions and the number of laying personnel are equal. According to the high and low of the grade proportion, the corresponding tobacco leaves are laid from the leaf laying belt close to the end of the collection belt (i.e. the second collection place of the cut collection belt) in turn, and the laying position of C3F grade tobacco leaves is B 4-w (w takes values 1-4), B 5-w (w takes values 1-4), B 3-2 , B 3-3 , B 3-4 , B 6-2 , B 6-3 , B 6-4 ; the laying position of C1F grade tobacco leaves is B 3-1 , B 2-3 , B 2-4 , B 6-1 , B 7-3 , B 7-4 ; the laying position of C2F grade tobacco leaves is B 2-1 , B 2-2 , B 1-4 , B 7-1 , B 7-2 , B 8-4 ; the laying position of X1F grade tobacco leaves is B 1-3 , B 1-2 , B 8-3 ; the laying position of X2F grade tobacco leaves is B 1-1 , B 8-2 ; and the laying position of B1F grade tobacco leaves is B 8-1; The C3F grade tobacco leaf is placed at position B 4-w (w takes value 1-4), B 5-w (w takes value 1-4), B 3-w (w takes value 1-4), B 6-3 , B 6-4 ; The C1F grade tobacco leaf is placed at position B 2-w (w takes value 1-4), B 6-1 , B 6-2 ; The C2F grade tobacco leaf is placed at position B 7-w (w takes value 1-4), B 1-3 , B 1-4 ; The X1F grade tobacco leaf is placed at position B 8-2 , B 8-3 , B 8-4 ; The X2F grade tobacco leaf is placed at position B 1-1 , B 1-2 ; The B1F grade tobacco leaf is placed at position B 8-1 ; For placing two or more grades of tobacco leaves on the same tobacco leaf laying belt, cross laying or multi-thin-layer superimposed laying method can be adopted according to the situation, for example, the tobacco leaf laying belt 1 has C2F and X2F grade tobacco leaves placed thereon, and the number of positions for placing the two grades of tobacco leaves is 2, so cross laying method is adopted; for the tobacco leaf laying belt 8, although it has X1F and B1F grade tobacco leaves placed thereon, the number of positions for placing the two grades of tobacco leaves is 3 and 1 respectively, and since the grade proportion (1%) of B1F is very small, multi-thin-layer superimposed laying method is adopted, that is, the B1F grade tobacco leaf is placed on the X1F grade tobacco leaf in thin layer.

[0091] According to the processing flow L = 12000 kg / h, the average feeding amount T of each grade of tobacco leaf per hour is calculated i = L * i% (i = a, b, c, d, e, f…); the average feeding amount of C3F, C1F, C2F, X1F, X2F and B1F grade tobacco leaf per hour is 5400 kg / h, 2400 kg / h, 2160 kg / h, 1200 kg / h, 720 kg / h and 120 kg / h respectively;

[0092] According to the number of leaf laying persons, the average feeding amount R of each grade of tobacco leaf per hour per person is calculated Ti = T i / R i , for example, the average feeding amount of X1F (3 leaf laying persons) and B1F (1 leaf laying person) per hour per person is 240 kg / h and 120 kg / h respectively.

[0093] The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1).

[0094] The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). n(x-w) , The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). (n+1)(x-w) , The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). x-w , The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). T(n+1)(x-w) , The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). n(x-w) , The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). The weight of the frame tobacco at each position is read once every 1 min interval (set △t = 1). (n+1)(x-w) ;

[0095] The total amount of tobacco laid at each position is calculated as K T(x-w) =∑K T(n+1)(x-w) , n = 0, 1, 2, 3, …; Z 0(x-w) = 0 at the beginning; and K T(n+1)(x-w) is not accumulated when it is less than or equal to 0.

[0096] For example, at the 10th minute, the amount of tobacco laid at B 8-2 position is 36 kg, at B 8-3 position is 42 kg, at B 8-4 position is 32 kg, and at B 8-1 position is 16 kg.

[0097] The total amount of tobacco laid at each position is calculated as K Ti =∑K T(x-w) (w, x are values corresponding to i), for example, the total amount of tobacco laid at B Ti position is 110 kg, and at B T(x-w) position is 16 kg.

[0098] The laying speed of the frame tobacco at each position is calculated as V T(x-w) =∑K T(n+1)(x-w) / ∑△t, for example, the laying speed of the frame tobacco at B 8-2 position is 3.6 kg / min, at B 8-3 position is 4.2 kg / min, at B 8-4 position is 3.2 kg / min, and at B 8-1 position is 1.6 kg / min.

[0099] According to the real-time weighing data and real-time feeding speed of the station, the remaining feeding time S of the station at any (n+1)*△t moment is calculated T(x-w) = Z(n+1)(x-w) / V T(x-w) Assuming that the initial tobacco weight is 500 kg, the remaining feeding time of the tobacco at the 10th minute of the station for X1F (3 people for laying tobacco) and B1F (1 person for laying tobacco) grades is respectively: 8-2 Position 129 min, B 8-3 Position 109 min, B 8-4 Position 146 min, B 8-1 Position 302 min.

[0100] Comparing the actual feeding amount of each station with the theoretical calculation amount of the frame tobacco, such as the X1F (3 people for laying tobacco) and B1F (1 person for laying tobacco) grades of tobacco at the 10th minute of each laying position, the feeding percentage ratio is respectively: 8-2 Position 90, B 8-3 Position 105, B 8-4 Position 80, B 8-1 Position 80; it can be seen that the B 8-2 Position, B 8-4 Position, B 8-1 Position feeding progress is relatively slow, B 8-3 Position feeding progress is relatively fast.

[0101] The percentage ratio δ of the actual feeding amount of each grade of tobacco after the time (n+1)*△t to the theoretical calculation amount is calculated d For example, the X1F (3 people for laying tobacco) and B1F (1 person for laying tobacco) grades of tobacco at the 10th minute, the feeding percentage ratio of the grade tobacco is respectively: X1F is 91.67; B1F is 80. It can be seen that the overall laying progress of these two grades of tobacco is relatively slow, then the following two measures can be taken, the first way is to urge the laying personnel of the corresponding station to speed up the laying progress; the second way is to adjust the speed of the laying belt 8, such as the frequency of the variable frequency motor is originally set to 20 Hz, the frequency of the laying belt motor can be adjusted to 25 Hz, then in the case of keeping the laying form and density of the grade tobacco on the laying belt 8 unchanged, it is helpful to realize that the feeding percentage ratio of B1F grade tobacco is close to 100, and the B 8-4 Position feeding percentage ratio is close to 100 (here, the adjustment of the frequency of the belt motor is considered based on the feeding percentage ratio of B1F grade tobacco because the proportion of F1F grade is relatively low, and its laying speed is relatively difficult to control), generally speaking, when the laying progress of more than 2 / 3 stations on the same laying belt is slow or fast, the frequency of the belt motor can be adjusted.

[0102] The above calculation process can be realized by a PLC system, and the calculation value S T(x-w) Output to the corresponding display screen of the preparation area, so that the personnel pulling the empty cigarette frame and the personnel pulling the cigarette frame can have more accurate control over the replacement time, eliminate the waiting time, and improve the target orientation and work efficiency. The value of delta k And the value of delta d Output to the corresponding display screen of the laying station. The value of delta k To prompt the laying personnel whether the laying speed is reasonable for timely adjustment, the value of delta d To prompt the personnel laying the same grade frame whether the total laying speed is reasonable for timely adjustment to ensure the stability of the laying proportion of the grade frame, and eliminate the cumulative error caused by the individual material quantity difference of the laying personnel.

[0103] In the specific embodiment, the number of laying belts in the left group and the right group is the same, but it is not limited thereto, for example, the number of laying belts in the two groups can also be different, for example, the difference in number is 1.

[0104] In addition, the "cigarette frame" described in the present application refers to the empty cigarette frame and the tobacco leaf, and the "frame" refers to the empty cigarette frame. Each time the cigarette frame is replaced, the empty cigarette frame is directly pulled away and a new cigarette frame is directly replaced. Each time the weight is weighed, the skinning calculation needs to be performed, that is, the weighed weight is reduced by the weight of the empty cigarette frame. The weight of the empty cigarette frame is generally approximately equal or a determined value.

[0105] The present application also provides a corresponding control system, and the technical scheme is as follows:

[0106] The balanced feeding control system for redrying tobacco leaves based on multi-line feeding comprises:

[0107] A plurality of laying belts (1-8) with the same conveying direction are divided into two groups, that is, a left group and a right group. The number of laying belts in the left group is different from or the same as the number of laying belts in the right group. The end of each laying belt in the left group is provided with a left belt 11 for receiving the tobacco leaves conveyed by all laying belts in the left group. The conveying direction of the left belt 11 is perpendicular to the conveying direction of the laying belts in the left group. The end of each laying belt in the right group is provided with a right belt 12 for receiving the tobacco leaves conveyed by all laying belts in the right group. The conveying direction of the right belt 12 is perpendicular to the conveying direction of the laying belts in the right group. The left belt 11 is opposite to the right belt 12, and the ends of the two belts are close to each other.

[0108] Several workstations are set up along the conveying direction of each leaf-laying belt. A frame of tobacco is placed at each workstation, and a weighing device is installed at the corresponding position of each frame of tobacco. A display screen is installed at the corresponding position of each workstation. The total number of workstations is Q, the total number of leaf-laying personnel is P, and the placement position of each frame of tobacco is B. x-w Where x is the leaf-laying line number corresponding to the leaf-laying belt, x = 1, 2, 3, ..., w is the frame tobacco position number corresponding to the leaf-laying belt, w = 1, 2, 3, ..., all the tobacco leaves of each grade to be fed are sorted from high to low according to the known grade ratio i%: a%, b%, c%, d%, e%, f%, ..., where i = a, b, c, d, e, f, ..., and ∑i% = 100%; the number of leaf-laying personnel allocated to each grade of tobacco leaves is the integer value of P*i%, which is a positive integer value, denoted as Ri, and satisfies ΣRi = P;

[0109] The first multi-level tobacco feeding calculation module is used to compare the actual amount of tobacco fed into each workstation with the theoretical amount that should be fed, and calculate the ratio δ. k The output, presented as a percentage, is given to the relevant leaf-laying personnel, as follows:

[0110] Calculate the average hourly feed rate T for each grade of tobacco leaves based on the known processing flow rate L. i =L*i%;

[0111] The average feed rate R per person per hour for each grade of tobacco leaf laying position was calculated. Ti =T i / R i ;

[0112] The weight of the tobacco leaves in the frame is read once at every time interval Δt. Let Z be the weight of the tobacco leaves at the nth time interval n*Δt. n(x-w) The weight of the cigarette in the (n+1)th interval (n+1)*△t is Z. (n+1)(x-w) Then B x-w The amount of material fed into the frame at position n from time n*△t to time (n+1)*△t is K. T(n+1)(x-w) =Z n(x-w) -Z (n+1)(x-w) ; where the unit of time Δt is minutes;

[0113] Calculate B x-w The total amount of tobacco leaves fed at location K T(x-w) =ΣK T(n+1)(x-w) Where n takes values ​​of 0, 1, 2, 3..., and is initially set to Z. 0(x-w) =0, when K T(n+1)(x-w) When the value is less than or equal to 0, no cumulative calculation is performed;

[0114] We arrive at: δk = 100 * actual tobacco feeding amount / theoretical feeding amount

[0115] = 100 * (K T(x-w) / n *△t) / (R Ti / 60)

[0116] = 6 * 10 5 *R i *ΣK T(n+1)(x-w) / (L*i*n*△t), the value δ k is used to prompt the progress of tobacco feeding;

[0117] a secondary gathering belt arranged at the end of the left belt and the right belt;

[0118] a control module electrically connected to the weighing device, the display screen and the first multi-grade tobacco feeding calculation module, the weight information obtained by the weighing device being transmitted to the first multi-grade tobacco feeding calculation module through the control module, the first multi-grade tobacco feeding calculation module calculating the value δ k transmitted to the display screen through the control module.

[0119] Further, it further comprises a residual feeding time calculation module electrically connected to the control module and the calculation process of which is as follows:

[0120] According to the feeding amount K T(x-w) , the feeding speed V T(x-w) of the tobacco at this station is calculated as follows: T(n+1)(x-w) =ΣK

[0121] According to the real-time weighing amount of the tobacco at this station and the feeding speed, the residual feeding time S T(x-w) of the tobacco at any (n+1)*△t moment is calculated as follows: (n+1)(x-w) =Z T(x-w) / V

[0122] Further, it further comprises a second multi-grade tobacco feeding calculation module electrically connected to the control module and the calculation process of which is as follows:

[0123] The total feeding amount of the tobacco of the same grade is obtained as follows: Ti =ΣK T(x-w) ;

[0124] The percentage ratio δ d of the actual feeding amount and the theoretical feeding amount of each grade of tobacco after the time (n+1)*△t is calculated as follows:

[0125] δ d = 100 * actual tobacco feeding amount / tobacco feeding amount

[0126] = 100 * (D Ti / (n + 1) * Δt) / (T i / 60)

[0127] = 6 * 10 5 * ΣK T(x-w) / (L * i * (n + 1) * Δt), the value δ d The laying progress of the same grade of tobacco leaves is prompted.

[0128] As Figure 1 shown, the height limiting device 9 is a horizontally adjustable rod, and the cutting device 10 is a SLQD type double-way tobacco leaf cutting machine.

[0129] As Figure 1 shown, the distributing device 15 is provided at the end of the secondary gathering belt 13, and has two outlets respectively communicating two distributing belts 14, 16 in different conveying directions.

[0130] As Figure 1 shown, first, the positions of the tobacco leaves in the frames are determined for the eight laying belts (1, 2, 3, 4, 5, 6, 7, 8), a weighing device is installed at the positions of the tobacco leaves in the frames, and a height limiting device 9 is provided at the end of the eight laying belts close to the cutting device 10. The tobacco leaves on the laying belts 1, 2, 3, 4 are cut by the cutting device and then enter the left belt 11, and the tobacco leaves on the laying belts 5, 6, 7, 8 are cut by the cutting device and then enter the right belt 12. Then, the tobacco leaves on the left belt 11 and the right belt 12 are gathered again, and a distributing device 15 is provided at the end of the secondary gathering belt 13 to distribute the mixed tobacco leaves into the distributing belts 14, 15. Finally, the tobacco leaves are conveyed to the subsequent processing devices 17, 18.

[0131] As Figure 3 shown, the distributing device is a reciprocating distributing belt 19, which is reversely rotated after rotating for a certain time, thereby realizing the distribution. The belt rotates at a relatively high speed.

[0132] As Figure 4 shown, the distributing device is a rake roller type distributing device. After the tobacco leaves are thrown out at the end of the secondary gathering belt 13, the tobacco leaves are in a flat-throwing free-fall motion, and then, under the reverse action of the rake nails 20, part of the tobacco leaves enter the right belt and then enter the corresponding subsequent processing device, and the other part of the tobacco leaves not acted on by the rake nails 20 enter the left belt and then enter the corresponding subsequent processing device.

Claims

1. A method for uniform feeding control of redried tobacco leaves based on multi-line feeding, characterized by, It comprises the following steps: providing several rows of leaf laying belts with the same transmission direction, which are divided into two groups, a left group and a right group, the number of leaf laying belts in the left group being different from or the same as that in the right group, the end of each leaf laying belt in the left group being provided with a left belt for receiving the tobacco leaves transmitted by all the leaf laying belts in the left group, the transmission direction of the left belt being perpendicular to the transmission direction of the leaf laying belts in the left group, the end of each leaf laying belt in the right group being provided with a right belt for receiving the tobacco leaves transmitted by all the leaf laying belts in the right group, the transmission direction of the right belt being perpendicular to the transmission direction of the leaf laying belts in the right group, the left belt being opposite to the right belt and the ends of the two being close to each other; The total number of stations arranged at all the leaf laying belts is Q, each of the stations corresponds to one leaf laying personnel, the total number of leaf laying personnel is P, and one frame of cigarettes is placed at each station, a weighing device is arranged below each frame of cigarette position to realize real-time weighing of the frame of cigarettes, and the placement position of each frame of cigarettes is B x-w , wherein x is the leaf laying line number corresponding to the leaf laying belt, x = 1, 2, 3, …, and w is the frame of cigarette position number corresponding to the leaf laying belt, w = 1, 2, 3, … All the various grades of tobacco leaves to be fed are sorted in descending order of size according to known grade proportions i%: a%, b%, c%, d%, e%, f%, …, where i = a, b, c, d, e, f, …, and ∑i% = 100%; the number of allocated leafing persons for each grade of tobacco leaves is the integer values of the above-mentioned proportions i% are rounded to positive integer values, denoted as R i , and satisfy ∑R i = P. determining the placement positions of the tobacco leaves of different grades: first, placing the leaf tobacco of the largest grade proportion to the leaf tobacco placement positions of the left group close to the right group and / or the leaf tobacco placement positions of the right group close to the left group, and then placing the tobacco leaves of sequentially decreasing grade proportions to the leaf tobacco placement positions of the left group sequentially away from the right group and the leaf tobacco placement positions of the right group sequentially away from the left group; The actual tobacco feeding amount and the theoretical feeding amount of each workstation frame tobacco are compared, and the ratio δ of the actual feeding amount to the theoretical feeding amount is calculated k Output to the corresponding leaf layering personnel in percentage system, as follows: The average hourly amount of each grade of tobacco leaf to be fed is calculated according to the known processing flow L ; The average amount of tobacco R per person per hour for each grade of tobacco is calculated for the laying position Ti = T i / R i ; The weight of the tobacco leaves in the frame is read once at intervals Δt using a weighing device. Let the nth interval be... The weight of the tobacco leaves is Z. n(x-w) The (n+1)th interval The weight of the cigarette frame is Z. （n+1）（x-w) Then B x-w The first frame of the cigarette at the position The amount of material fed from time (n+1)*Δt is K. T（n+1）（x-w) =Z n(x-w) -Z （n+1）（x-w) ; where the unit of time Δt is minutes; B is calculated x-w total amount of tobacco K at the position T（x-w） =∑K T（n+1）（x-w) where n takes values 0, 1, 2, 3, …, and Z 0(x-w) =0 at the beginning, and when K T（n+1）（x-w) is less than or equal to 0, no cumulative calculation is performed; It is concluded that: Actual tobacco feed quantity / Theoretical tobacco feed quantity secondarily collecting the tobacco leaves transmitted by the left belt and the right belt.

2. The uniform feeding control method of redried tobacco based on multi-line feeding according to claim 1, wherein, It further comprises the following steps: According to the feeding amount K T（x-w） The feeding speed V of the tobacco leaves in the station is calculated T（x-w） = ΣK T（n+1）（x-w) / Σ△t; According to the real-time weight of the frame cigarette in the station and the feeding speed, the residual feeding time S of the frame cigarette in the station at any time is calculated T（x-w） =Z （n+1）（x-w) / V T（x-w） .​ 3. The uniform feeding control method of redried tobacco based on multi-line feeding according to claim 2, characterized by, It further comprises the following steps: The total amount of tobacco of the same grade is D Ti =∑K T（x-w） ; elapsed time δ: percentage ratio of actual amount of tobacco to be fed to each grade to the theoretical amount of tobacco to be fed after the time d : Actual tobacco feed amount / tobacco feed amount , the value δ d the leaf spreading progress for the same grade of tobacco leaf.

4. The uniform feeding control method of redried tobacco based on multi-line feeding according to claim 3, characterized by, A display screen is installed opposite each of the leafers, on which a value δ is displayed k , S T（x-w） , and δ d .

5. The uniform feeding control method of redried tobacco based on multi-line feeding according to claim 4, wherein, Further comprising the step of providing numerical values δ k and δ d allowed deviation ranges, and if the corresponding numerical value exceeds the corresponding deviation range, an alarm is triggered.

6. The uniform feeding control method of redried tobacco based on multi-line feeding according to claim 1, wherein, when the different grade proportions of the tobacco leaves on one leaf laying belt reach two or more, using non-overlapping cross feeding or overlapping feeding, and when the overlapping feeding is used, using partial overlapping or complete overlapping.

7. The uniform feeding control method of redried tobacco based on multi-line feeding according to claim 1, wherein, the incoming tobacco leaves are sequentially subjected to height limiting treatment and cutting treatment at the end of each leaf laying belt, and the tobacco leaves after the cutting treatment are respectively fed into the corresponding left belt and right belt.

8. The uniform feeding control method of redried tobacco based on multi-line feeding according to claim 1, wherein, It further comprises the following steps: performing feeding treatment on the secondarily collected tobacco leaves, dividing them into two parts, and conveying the two parts along different feeding belts to the next process.

9. The uniform feeding control method of redried tobacco based on multi-line feeding according to claim 1, wherein, In the step of determining the placement positions of the tobacco leaves of different grades, further comprising: after determining the placement positions in the order of grade proportion from large to small, performing fine adjustment, and the fine adjustment is to place the leaf tobacco of the same grade proportion after fine adjustment on the same belt side.

10. A uniform feeding control system for redrying tobacco leaves based on multi-line feeding, characterized by, It comprises: providing several rows of leaf laying belts with the same transmission direction, which are divided into two groups, a left group and a right group, the number of leaf laying belts in the left group being different from or the same as that in the right group, the end of each leaf laying belt in the left group being provided with a left belt for receiving the tobacco leaves transmitted by all the leaf laying belts in the left group, the transmission direction of the left belt being perpendicular to the transmission direction of the leaf laying belts in the left group, the end of each leaf laying belt in the right group being provided with a right belt for receiving the tobacco leaves transmitted by all the leaf laying belts in the right group, the transmission direction of the right belt being perpendicular to the transmission direction of the leaf laying belts in the right group, the left belt being opposite to the right belt and the ends of the two being close to each other; A plurality of work stations are arranged along the conveying direction of each of the tobacco leaf laying belts, and a grade-proportioned tobacco case is placed at each of the work stations. A weighing device is arranged at each of the tobacco case positions. A display screen is arranged on the other side of the belt at each of the work stations. The total number of the work stations is Q, the total number of the tobacco leaf laying personnel is P, and the placement position of each of the tobacco cases is B x-w , wherein x is the tobacco leaf laying line number corresponding to the tobacco leaf laying belt, x = 1, 2, 3, …, w is the tobacco case position number corresponding to the tobacco leaf laying belt, w = 1, 2, 3, …, all of the grade-proportioned tobaccos to be fed are sorted in descending order according to the known grade proportions i%: a%, b%, c%, d%, e%, f%, …, wherein i = a, b, c, d, e, f, …, and Σi% = 100%; the allocated number of the tobacco leaf laying personnel for each of the grade-proportioned tobaccos is , wherein x is the tobacco leaf laying line number corresponding to the tobacco leaf laying belt, x = 1, 2, 3, …, w is the tobacco case position number corresponding to the tobacco leaf laying belt, w = 1, 2, 3, …, all of the grade-proportioned tobaccos to be fed are sorted in descending order according to the known grade proportions i%: a%, b%, c%, d%, e%, f%, …, wherein i = a, b, c, d, e, f, …, and Σi% = 100%; the allocated number of the tobacco leaf laying personnel for each of the grade-proportioned tobaccos is , wherein x is the tobacco leaf laying line number corresponding to the tobacco leaf laying belt, x = 1, 2, 3, …, w is the tobacco case position number corresponding to the tobacco leaf laying belt, w = 1, 2, 3, …, all of the grade-proportioned tobaccos to be fed are sorted in descending order according to the known grade proportions i%: a%, b%, c%, d%, e%, f%, …, wherein i = a, b, c, d, e, f, …, The first multi-grade tobacco feeding calculation module is used for comparing the actual feeding amount and the theoretical feeding amount of tobacco for each workstation frame, and calculating the ratio δ k The output is in percentage and displayed on the display screen on one side of the tobacco laying belt, which provides a reference for the corresponding tobacco layer. The average hourly amount of each grade of tobacco leaf to be fed is calculated according to the known processing flow L ; The average amount of tobacco R per person per hour for each grade of tobacco is calculated for the leaf placement Ti = T i / R i ; The weight of the cigarette pack is read once at every interval Δt. Let the nth interval be... The weight of the tobacco leaves is Z. n(x-w) The (n+1)th interval The weight of the tobacco leaves is Z （n+1）（x-w) Then B x-w The first frame of cigarettes at the location Time's up The amount of material fed at time K T（n+1）（x-w) =Z n(x-w) -Z （n+1）（x-w) The unit of time Δt is minutes. B is calculated x-w the total amount of tobacco K at the position T（x-w） =∑K T（n+1）（x-w) where n takes the values 0, 1, 2, 3,..., Z 0(x-w) =0 at the start, and when K T（n+1）（x-w) is less than or equal to 0, no cumulative calculation is performed; a secondarily collecting belt arranged at the end of the left belt and the right belt; A control module electrically connected to the weighing device, the display screen and the first multi-grade tobacco feeding calculation module, the weight information obtained by the weighing device is transmitted to the first multi-grade tobacco feeding calculation module through the control module, and the first multi-grade tobacco feeding calculation module calculates the obtained value δ k transmitted to the display screen through the control module.

11. The uniform feeding control system for redrying tobacco based on multi-line feeding according to claim 10, wherein, It further comprises a residual feeding time calculation module electrically connected to the control module and the calculation process thereof is as follows: According to the feeding amount K T（x-w） The feeding speed V of the tobacco leaves in the station is calculated T（x-w） = ΣK T（n+1）（x-w) / Σ△t; According to the real-time weight of the tobacco leaves in the frame and the feeding speed, the residual feeding time S of the frame at any time is calculated T（x-w） =Z （n+1）（x-w) / V T（x-w） .​ 12. The uniform feeding control system for redrying tobacco based on multi-line feeding according to claim 11, wherein, It further comprises a second multi-grade tobacco leaf feeding calculation module electrically connected to the control module and the calculation process thereof is as follows: The total amount of tobacco of the same grade is D Ti =∑K T（x-w） ; elapsed time δ: percentage ratio of actual amount of tobacco to be fed to each grade to the theoretical amount of tobacco to be fed after the time d : Actual tobacco feed amount / tobacco feed amount , the value δ d The leaf laying progress for prompting the same grade of tobacco leaves.

13. The uniform feeding control system for redrying tobacco based on multi-line feeding of claim 10, wherein, The height limiting device is a horizontal rod with adjustable height, and the cutting device is a SLQD type double-path leaf distribution cutting machine.

14. The uniform feeding control system for re-drying tobacco based on multi-line feeding according to claim 11, wherein, The distributing device is provided at the end of the secondary collecting belt, and has two outlets respectively connected with two distributing belts in different conveying directions.

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