Method and device for controlling the volume flow of a process tank discharge

Abstract

The application discloses a kind of process silo discharge volume flow control method and control device, the method includes: using the actual volume flow of tobacco material on public conveying belt is obtained by granular flowmeter;According to the actual volume flow of tobacco material on public conveying belt, the transmission frequency of public conveying belt is corrected, and the real-time transmission frequency of public conveying belt is obtained;According to the real-time transmission frequency of public conveying belt, the real-time transmission frequency of the bottom belt of process silo is calculated to obtain.The present application forms feedforward plus feedback control mode on the tobacco making line, realizes the adjustable controllable of process silo discharge volume flow, without manual operation, improves the accuracy of process silo discharge volume flow control and the intelligent degree of whole line.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tobacco cutting, and particularly relates to a method and device for controlling the volume flow of a process silo. BACKGROUND

[0002] A process silo is a device for storing tobacco in a cigarette factory. As a storage unit, the process silo is generally composed of a cabinet, a bottom belt, a discharge rake roller and the like, and provides sufficient tobacco leaves or tobacco for subsequent processing procedures. The process silo is a front-end process unit of a fine processing procedure, and plays an extremely important role in the production of the entire production line.

[0003] In existing production control, some process silos discharge at a fixed speed according to the detection of a photocell. However, the discharge flow is unknown, and the thickness of the material stored in the process silo is different due to the structural characteristics of the process silo, especially in the areas of the head and tail of the silo. The fixed speed will result in unstable discharge flow of the process silo, which may be higher or lower than the subsequent flow requirement, and cannot meet the flow requirement of the subsequent processing procedure, so that the processing precision cannot meet the process index, and seriously affects the product quality.

[0004] At the same time, in order to ensure sufficient supply of the flow, the bottom belt frequency set by the workers is usually much greater than the optimal frequency, and the optimal matching of the material flow of each link on the entire line cannot be achieved.

[0005] Therefore, the present application is proposed. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, and to provide a method for controlling the volume flow of a process silo. The actual volume flow of tobacco material on a common conveying belt is obtained by using a bulk flow meter, and the real-time conveying frequency of the common conveying belt is obtained by correcting the conveying frequency of the common conveying belt according to the actual volume flow of the tobacco material on the common conveying belt. The real-time conveying frequency of the bottom belt of the process silo is calculated according to the real-time thickness and the standard thickness of the tobacco material in the process silo, the real-time conveying frequency and the standard conveying frequency of the common conveying belt, and the standard conveying frequency of the bottom belt of the process silo. The frequency of the common conveying belt and the bottom belt of the process silo is adjusted by using a feedforward and feedback control mode, so that the volume flow of the process silo is adjustable and controllable.

[0007] To solve the above technical problems, the basic idea of the technical solution of the present application is as follows: a method for controlling the volume flow of a process silo, comprising:

[0008] obtaining the actual volume flow of tobacco material on a common conveying belt by using a bulk flow meter;

[0009] According to the actual volume flow of the tobacco material on the common conveying belt, the conveying frequency of the common conveying belt is corrected to obtain a real-time conveying frequency of the common conveying belt;

[0010] According to the real-time conveying frequency of the common conveying belt, a real-time conveying frequency of the bottom belt of the process tank is calculated.

[0011] Further, it further comprises:

[0012] According to the preset volume flow, the standard volume flow of the tobacco material on the common conveying belt, and the standard conveying frequency of the common conveying belt, the conveying frequency of the common conveying belt is calculated;

[0013] The conveying frequency F1_1 of the common conveying belt is:

[0014] F1_1 = VF_SP / VF_SP_0 * F1_0;

[0015] Wherein, VF_SP is the preset volume flow of the tobacco material on the common conveying belt; VF_SP_0 is the standard volume flow of the tobacco material on the common conveying belt; and F1_0 is the standard conveying frequency of the common conveying belt.

[0016] Further, according to the actual volume flow of the tobacco material on the common conveying belt, the conveying frequency of the common conveying belt is corrected, which comprises:

[0017] The volume difference between the actual volume flow and the preset volume flow of the tobacco material on the common conveying belt is calculated;

[0018] According to the volume difference, a correction value of the conveying frequency of the common conveying belt is calculated.

[0019] Further, according to the volume difference, a correction value of the conveying frequency of the common conveying belt is calculated, which comprises:

[0020] The volume difference is calculated by PID to obtain the correction value, and the correction value F1_2 is:

[0021] F1_2 = PID (VF_SP - VF_PV);

[0022] Wherein, VF_PV is the actual volume flow of the tobacco material on the common conveying belt.

[0023] Further, it further comprises:

[0024] After the correction value is used to correct the conveying frequency of the common conveying belt, a real-time conveying frequency of the common conveying belt is obtained;

[0025] The real-time conveying frequency F1 of the common conveying belt is:

[0026] F1 = F1_1 + F1_2 = VF_SP / VF_SP_0 * F1_0 + PID(VF_SP - VF_PV).

[0027] In the above scheme, the correction value is calculated by the volume difference between the actual volume flow of the tobacco material on the common conveying belt measured by the bulk flow meter and the preset volume flow, and the real-time conveying frequency of the common conveying belt is corrected to obtain the real-time conveying frequency of the common conveying belt, which belongs to feedback correction on the tobacco processing line.

[0028] Further, the real-time conveying frequency of the bottom belt of the process silo is calculated according to the real-time conveying frequency of the common conveying belt, comprising:

[0029] Obtaining the real-time thickness of the tobacco material in the process silo;

[0030] The real-time conveying frequency of the bottom belt of the process silo is calculated according to the real-time thickness of the tobacco material in the process silo, the standard thickness, the real-time conveying frequency of the common conveying belt, the standard conveying frequency, and the standard conveying frequency of the bottom belt of the process silo.

[0031] Further, the real-time conveying frequency F2 of the bottom belt of the process silo is:

[0032] F2 = (F1 / F1_0) * (H2_0 / H2) * F2_0;

[0033] Wherein, F2_0 is the standard conveying frequency of the bottom belt of the process silo; H2_0 is the standard thickness of the tobacco material in the process silo; H2 is the real-time thickness of the tobacco material in the process silo.

[0034] In the above scheme, the real-time conveying frequency of the bottom belt of the process silo is calculated by the real-time thickness of the tobacco material in the process silo, the real-time conveying frequency of the common conveying belt, and the like, and the conveying frequency of the bottom belt of the process silo is adjusted, which belongs to feedforward and feedback correction on the tobacco processing line.

[0035] By adjusting the frequency of the common conveying belt and the bottom belt of the process silo, the adjustable and controllable process silo discharge volume flow is realized, and the matching of the process silo discharge volume flow and the volume flow of the tobacco material on the common conveying belt is realized, which prevents the accumulation and transportation stagnation of the tobacco material, the fluctuation of the batch material moisture caused by the frequent start and stop of the bottom belt, and the fluctuation of the height of the tobacco material in the process silo, thereby affecting the formation of homogenized material conveying and further reducing the crushing, and overall improving the quality of the tobacco material.

[0036] It should be noted that the standard volume flow of the tobacco material on the common conveying belt, the standard conveying frequency of the common conveying belt, the standard thickness of the tobacco material in the process silo, and the standard conveying frequency of the bottom belt of the process silo are obtained by technical workers according to actual experience and data processing model.

[0037] A device for controlling the volume flow of the discharge of a process silo, using a method for controlling the volume flow of the discharge of a process silo as described above, said device comprising:

[0038] a plurality of process silos arranged side by side for storing different batches of tobacco material;

[0039] each process silo is provided with at least one bottom belt, the bottom belts of each process silo are not operated simultaneously, said bottom belts are used for discharging;

[0040] a common conveyor belt connected to the bottom belts of each process silo for conveying the material;

[0041] a bulk flow meter is arranged on the common conveyor belt for obtaining the actual volume flow of the tobacco material on the common conveyor belt.

[0042] In the above scheme, the bulk flow meter uses a rotating laser, which can measure the tobacco material on the common conveyor belt in all directions, with a resolution of about one data per 0.1 degree. After point cloud calculation and processing, the real volume flow value and material thickness can be accurately measured, and the accuracy is high.

[0043] Further, a bracket is further included, the bracket is fixedly arranged below, the bracket is horizontally arranged above the common conveyor belt, and the bracket is non-contact with the common conveyor belt;

[0044] The bulk flow meter is arranged on the bracket and above the common conveyor belt.

[0045] In the above scheme, the bracket is arranged to support the bulk flow meter above the common conveyor belt, so as to facilitate the measurement of the relevant data of the tobacco material on the common conveyor belt. The bracket is non-contact with the common conveyor belt, so as to avoid the vibration of the common conveyor belt during conveying from affecting the measurement of the bulk flow meter and improve the measurement accuracy.

[0046] Further, a laser line scanner is arranged above the inside of the process silo for obtaining the real-time thickness of the tobacco material in the process silo.

[0047] In the above scheme, the laser line scanner scans the tobacco material downward from the top end of the process silo, obtains a plurality of thickness values of the discharge section, and then calculates the average thickness as the real-time thickness. Compared with the traditional grating, the grating can only obtain the data of the highest point and cannot obtain the average value.

[0048] After adopting the above technical scheme, the present application has the following beneficial effects compared with the prior art:

[0049] 1. The application provides a kind of process silo discharge volume flow control method, utilize the actual volume flow of tobacco material on the public conveying belt of bulk flow meter, can obtain the volume flow value of real, high accuracy, and according to the actual volume flow of tobacco material on the public conveying belt to the conveying frequency of public conveying belt correction, obtain the real-time conveying frequency of public conveying belt, according to the real-time thickness of tobacco material in process silo, standard thickness, real-time conveying frequency of public conveying belt, standard conveying frequency, the real-time conveying frequency of the bottom belt of process silo is calculated to the bottom belt of process silo, by feedforward plus feedback control mode, adjust the frequency of public conveying belt and the bottom belt of process silo, realize the adjustable controllable of process silo discharge volume flow, without manual operation, improve the accuracy of discharge volume flow control and the intelligent degree of whole line.

[0050] 2, in the control method of the application, by adjusting the frequency of public conveying belt and the bottom belt of process silo, realize the adjustable controllable of process silo discharge volume flow, at the same time, realize the matching of process silo discharge volume flow and the volume flow of tobacco material on public conveying belt, prevent the accumulation of tobacco material, the batch material moisture fluctuation caused by conveying stagnation, the height fluctuation of tobacco material in process silo caused by frequent start-stop of bottom belt, thereby affect the formation of homogenization material conveying, further reduce the broken, improve the quality of tobacco material as a whole.

[0051] 3, in the application, bulk flow meter is set above public conveying belt, bulk flow meter adopts rotating laser, can measure tobacco material on public conveying belt in all directions, resolution is about one data per 0.1 degree, after point cloud calculation processing, can accurately measure the real volume flow value, in actual cut tobacco production line, the difference between cumulative mass flow measured by bulk flow calculation and batch cumulative output is within the ideal error range, with high accuracy.

[0052] 4, in the application, a laser line scanner is set in each process silo, realize the feedforward correction of volume flow on cut tobacco line on the basis of reducing cost, eliminate the disturbance problem of material thickness change in process silo to volume flow;By setting a bulk flow meter on public conveying belt, accurately measure the volume flow of material on public conveying belt, realize the feedback correction of volume flow on cut tobacco line, and then realize that a bulk flow meter can control multiple process silos, reduce the cost as a whole;And the bottom belt of public conveying belt and process silo is set to frequency conversion control, by adjusting its running frequency, change the linear velocity, so as to realize the adjustment of volume flow.

[0053] 5、The present application sets up the support, erects the bulk flowmeter above the public conveying belt, and facilitates the measurement of the relevant data of the tobacco material on the public conveying belt; the support is not in contact with the public conveying belt, so as to avoid the vibration of the public conveying belt in the conveying process from affecting the measurement of the bulk flowmeter and improve the measurement accuracy.

[0054] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0055] The accompanying drawings, which are part of the present application, serve to further understand the present application, and the illustrative embodiments of the present application and their descriptions serve to explain the present application but do not constitute improper limitations on the present application. Obviously, the accompanying drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0056] Figure 1 is the main step flow chart of the control method in the present application;

[0057] Figure 2 is the specific step flow chart of the control method in the present application;

[0058] Figure 3 is the structure schematic diagram of the control device in the present application.

[0059] In the drawings: 100, process tank; 200, bottom belt; 300, public conveying belt; 400, support; 500, bulk flowmeter.

[0060] It should be noted that these drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below with reference to the drawings of the embodiments of the present application. The following embodiments are used to illustrate the present application but not to limit the scope of the present application.

[0062] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0063] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "abutted" and the like should be understood in a broad sense, for example, it can be detachable connection, or mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0064] As an embodiment, the present application provides a process tank discharge volume flow control method, as shown in the following steps: Figure 1

[0065] S1: obtaining the actual volume flow of tobacco material on the common conveyor belt by using the bulk flow meter;

[0066] S2: correcting the conveying frequency of the common conveyor belt according to the actual volume flow of tobacco material on the common conveyor belt, to obtain the real-time conveying frequency of the common conveyor belt;

[0067] S3: calculating the real-time conveying frequency of the bottom belt of the process tank according to the real-time conveying frequency of the common conveyor belt.

[0068] As an embodiment, the present application provides a process tank discharge volume flow control method, as shown in the following steps: Figure 2

[0069] S1: obtaining the preset volume flow VF_SP of tobacco material on the common conveyor belt;

[0070] S2: obtaining the standard volume flow VF_SP_0 of tobacco material on the common conveyor belt;

[0071] S3: obtaining the standard conveying frequency F1_0 of the common conveyor belt;

[0072] S4: calculating the conveying frequency F1_1 of the common conveyor belt according to the preset volume flow, the standard volume flow of tobacco material on the common conveyor belt, and the standard conveying frequency of the common conveyor belt: F1_1 = VF_SP / VF_SP_0*F1_0;

[0073] S5: obtaining the actual volume flow VF_PV of tobacco material on the common conveyor belt;

[0074] S6: calculating the volume difference between the actual volume flow and the preset volume flow of tobacco material on the common conveyor belt, and performing PID calculation on the volume difference to obtain the correction value: F1_2 = PID(VF_SP-VF_PV);

[0075] ​​S7: obtaining the real conveying frequency of the common conveyor belt after correcting the conveying frequency of the common conveyor belt by the correction value: F1=F1_1+F1_2=VF_SP / VF_SP_0*F1_0+PID(VF_SP-VF_PV);

[0076] S8: obtaining the standard thickness H2_0 of the tobacco material in the process silo;

[0077] S9: obtaining the standard conveying frequency F2_0 of the bottom belt of the process silo;

[0078] S10: obtaining the real thickness H2 of the tobacco material in the process silo;

[0079] S11: calculating the real conveying frequency of the bottom belt of the process silo according to the real thickness and the standard thickness of the tobacco material in the process silo, the real conveying frequency and the standard conveying frequency of the common conveyor belt, and the standard conveying frequency of the bottom belt of the process silo: F2=(F1 / F1_0)*(H2_0 / H2)*F2_0.

[0080] In the embodiment, the derivation process of the real conveying frequency F1 of the common conveyor belt is as follows:

[0081] It can be understood that the volume flow VF on the common conveyor belt or the bottom belt is equal to the product of the linear speed V of the common conveyor belt or the bottom belt and the cross-sectional area S of the material, i.e.:

[0082] VF=V*S.

[0083] Since the width of the common conveyor belt or the bottom belt is fixed, the cross-sectional area S of the material is proportional to the thickness H of the material; and the running frequency F of the common conveyor belt or the bottom belt is proportional to the linear speed V, so:

[0084] VF=F*H*FAC, wherein FAC is a constant.

[0085] According to the above relationship, a model is established to obtain the standard volume flow VF_SP_0 of the tobacco material on the common conveyor belt, the standard conveying frequency F1_0 of the common conveyor belt, and the standard thickness H1_0 of the tobacco material on the common conveyor belt, and it is obtained that VF_SP_0=F1_0*H1_0*FAC1.

[0086] Further, the standard constant FAC1 is derived as FAC1=VF_SP_0 / (F1_0*H1_0).

[0087] In a specific implementation process, the volume flow of the tobacco material on the common conveyor belt is set as VF_SP, the thickness of the tobacco material on the common conveyor belt is preset as H1, and the running frequency of the common conveyor belt is preset as F1_1, and the relationship VF_SP=F1_1*H1*FAC1 is obtained.

[0088] F1_1 = VF_SP / (H1 * FAC1);

[0089] F1_1 = VF_SP / (H1 * FAC1);

[0090] F1_1 = VF_SP / (H1 * FAC1);

[0091] F1_1 = VF_SP / (H1 * FAC1);

[0092] F1_1 = VF_SP / (H1 * FAC1);

[0093] Next, the actual volume flow VF_PV of the tobacco material on the common conveyor belt is obtained, the volume difference between the actual volume flow and the preset volume flow of the tobacco material on the common conveyor belt is calculated, and the volume difference is subjected to PID calculation to obtain a correction value: F1_2 = PID(VF_SP-VF_PV);

[0094] The real-time conveying frequency F1 of the common conveyor belt is obtained after the conveying frequency of the common conveyor belt is corrected by using the correction value: F1 = F1_1 + F1_2 = VF_SP / VF_SP_0 * F1_0 + PID(VF_SP-VF_PV).

[0095] In the embodiment, the derivation process of the real-time conveying frequency F2 of the bottom belt of the process tank is as follows:

[0096] It can be understood that the process tank serves as a feed-forward discharging device, and the product of the cross-sectional area of the process tank and the conveying speed of the bottom belt is the discharging flow of the process tank; the common conveyor belt serves as a feedback conveying device, and the product of the cross-sectional area of the tobacco material on the common conveyor belt and the conveying speed of the common conveyor belt is the volume flow of the tobacco material on the common conveyor belt; since the tobacco material discharged from the process tank needs to be conveyed to the next device through the common conveyor belt, the discharging volume flow VF2 of the process tank should be equal to the volume flow VF1 of the tobacco material accumulated and detected on the common conveyor belt, i.e. VF1 = VF2.

[0097] A model is established by VF = F * H * FAC to obtain:

[0098] F1_0 * H1_0 * FAC1 = F2_0 * H2_0 * FAC1';

[0099] Wherein, F2_0 is the standard conveying frequency of the bottom belt of the process tank, H2_0 is the standard thickness of the tobacco material in the process tank, and FAC1' is the standard constant of the process tank.

[0100] Further derivation obtains: F1_0*H1_0*(FAC1 / FAC1')=F2_0*H2_0;

[0101] FAC1 / FAC1' is a constant, replace it with FAC2, and obtains:

[0102] F1_0*H1_0*FAC2=F2_0*H2_0;

[0103] FAC2=(F2_0*H2_0) / (F1_0*H1_0), which is the transmission coefficient between the common conveying belt and the bottom belt of the process tank.

[0104] In a specific implementation process, the real-time thickness H2 of the tobacco material in the process tank is obtained, the transmission frequency of the bottom belt of the process tank is preset as F2, and the following equation is obtained:

[0105] F1*H1*FAC2=F2*H2;

[0106] Substitute FAC2=(F2_0*H2_0) / (F1_0*H1_0) into the above equation, and obtain:

[0107] F2=(F1*H1) / (F1_0*H1_0)*(H2_0 / H2)*F2_0;

[0108] The thickness of the material on the common conveying belt is controlled to be constant, H1_0=H1, and then:

[0109] F2=(F1 / F1_0)*(H2_0 / H2)*F2_0.

[0110] The application uses the bulk flow meter to obtain the actual volume flow of the tobacco material on the common conveying belt, can obtain a real and high-precision volume flow value, and corrects the transmission frequency of the common conveying belt according to the actual volume flow of the tobacco material on the common conveying belt, obtains the real-time transmission frequency of the common conveying belt, and calculates the real-time transmission frequency of the bottom belt of the process tank according to the real-time thickness and the standard thickness of the tobacco material in the process tank, the real-time transmission frequency and the standard transmission frequency of the common conveying belt, and the standard transmission frequency of the bottom belt of the process tank. Through the feedforward and feedback control mode, the frequencies of the common conveying belt and the bottom belt of the process tank are adjusted, the discharge volume flow of the process tank is adjustable and controllable, manual operation is not needed, and the accuracy of the discharge volume flow control and the intelligent degree of the whole line are improved.

[0111] It should be noted that there is also the following working condition: when discharging starts, the bulk flow meter on the common conveying belt still cannot detect the volume flow, and the process tank causes the material on the bottom belt to be too thin when discharging according to the preset frequency due to the large slope of the discharging slope. At this time, the material on the common conveying belt is adjusted to a constant thickness H1_0 according to the conveying frequency of the bottom belt of the process tank and the discharging thickness, and the conveying frequency of the common conveying belt.

[0112] As an embodiment, the present application provides a device for controlling the volume flow of discharging of a process tank, which adopts the method for controlling the volume flow of discharging of a process tank as described above.

[0113] As shown in Figure 3 , the device comprises a plurality of process tanks 100 arranged side by side and used for storing different batches of tobacco material.

[0114] It also comprises a laser line scanner arranged above the inside of the process tank 100 and used for acquiring the real-time thickness of the tobacco material in the process tank 100.

[0115] In the present embodiment, the laser line scanner scans the tobacco material downward from the top end of the process tank 100, can obtain a plurality of thickness values of the discharging section, and then calculates the average thickness as the real-time thickness.

[0116] Further, each process tank 100 is provided with at least one bottom belt 200 used for discharging.

[0117] The bottom belts 200 of each process tank 100 do not work at the same time.

[0118] It also comprises a common conveying belt 300 connected to the bottom belt 200 of each process tank 100 and used for conveying the material.

[0119] It also comprises a bulk flow meter 500 used for acquiring the actual volume flow of the tobacco material on the common conveying belt 300.

[0120] In the present embodiment, the bulk flow meter 500 adopts a rotating laser, can perform omnidirectional measurement on the tobacco material on the common conveying belt 300, has a resolution of about one data per 0.1 degree, and can accurately measure the real volume flow value through point cloud calculation processing and has high accuracy.

[0121] The bulk flow meter 500 can also be provided with a rotary encoder arranged below the common conveying belt 300, can directly measure the conveying speed of the common conveying belt 300, and the measurement result can be accurate to the order of microns.

[0122] The rotary encoder can transmit the measurement result to the bulk flow meter 500, facilitating data statistics and calculation.

[0123] The support 400 is fixed below and horizontally supported above the common conveyor belt 300 without contact with the common conveyor belt 300.

[0124] The bulk flow meter 500 is arranged on the support 400 above the common conveyor belt 300.

[0125] In the embodiment, the bulk flow meter 500 is arranged on the support 400 above the common conveyor belt 300, facilitating measurement of the relevant data of the tobacco material on the common conveyor belt 300. The support 400 is arranged without contact with the common conveyor belt 300 to avoid the vibration of the common conveyor belt 300 during conveying from affecting the measurement of the bulk flow meter 500 and improve the measurement accuracy.

[0126] It should be noted that the bottom belt 200 and the common conveyor belt 300 are both provided with variable frequency motors, and when the conveying speed of the bottom belt 200 or the common conveyor belt 300 needs to be adjusted, the rotation frequency of the motor can be adjusted to complete the adjustment.

[0127] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the scope of the present application, and any simple modification, equivalent change and modification of the above-mentioned embodiment within the scope of the present application are still within the scope of the present application.

Claims

1. A method of controlling the outfeed volumetric flow rate of a process tank, characterized in that, The method comprises the following steps: According to the preset volume flow of the tobacco material on the common conveying belt, the standard volume flow, and the standard conveying frequency of the common conveying belt, the conveying frequency of the common conveying belt is calculated; The conveying frequency F1_1 of the common conveying belt is: F1_1=VF_SP / VF_SP_0﹡F1_0; The actual volume flow of the tobacco material on the common conveying belt is obtained by using a bulk flow meter; According to the actual volume flow of the tobacco material on the common conveying belt, the conveying frequency of the common conveying belt is corrected to obtain the real-time conveying frequency of the common conveying belt; The volume difference between the actual volume flow and the preset volume flow of the tobacco material on the common conveying belt is calculated; According to the volume difference, the correction value of the conveying frequency of the common conveying belt is calculated; The correction value is obtained by performing PID calculation on the volume difference, and the correction value F1_2 is: F1_2=PID(VF_SP-VF_PV); According to the real-time conveying frequency of the common conveying belt, the real-time conveying frequency of the bottom belt of the process tank is calculated; The real-time conveying frequency F1 of the common conveying belt is obtained by correcting the conveying frequency of the common conveying belt by using the correction value; and the real-time conveying frequency F1 of the common conveying belt is: F1=F1_1+F1_2=VF_SP / VF_SP_0﹡F1_0+PID(VF_SP-VF_PV); Wherein, F1_1 is the conveying frequency of the common conveying belt; VF_SP is the preset volume flow of the tobacco material on the common conveying belt; VF_SP_0 is the standard volume flow of the tobacco material on the common conveying belt; F1_0 is the standard conveying frequency of the common conveying belt; F1_2 is the correction value; VF_PV is the actual volume flow of the tobacco material on the common conveying belt.

2. A method of controlling the outflow volumetric flow rate of a process tank according to claim 1, characterized in that, According to the real-time conveying frequency of the common conveying belt, the real-time conveying frequency of the bottom belt of the process tank is calculated, which comprises: The real-time thickness of the tobacco material in the process tank is obtained; According to the real-time thickness and the standard thickness of the tobacco material in the process tank, the real-time conveying frequency and the standard conveying frequency of the common conveying belt, and the standard conveying frequency of the bottom belt of the process tank, the real-time conveying frequency of the bottom belt of the process tank is calculated.

3. A method of controlling the outfeed volumetric flow rate of a process vessel according to claim 2, wherein, The real-time conveying frequency F2 of the bottom belt of the process tank is: F2=(F1 / F1_0)﹡(H2_0 / H2)﹡F2_0; Wherein, F2_0 is the standard conveying frequency of the bottom belt of the process tank; H2_0 is the standard thickness of the tobacco material in the process tank; and H2 is the real-time thickness of the tobacco material in the process tank.

4. A control device for process tank outfeed volumetric flow, characterized in that, The device comprises: A plurality of process tanks (100) arranged side by side and used for storing different batches of tobacco material; Each process tank (100) is provided with at least one bottom belt (200), and the bottom belts (200) of each process tank (100) are not operated at the same time, and the bottom belts (200) are used for discharging; A common conveying belt (300) is connected with the bottom belts (200) of each process tank (100) and used for conveying material; The bulk flow meter (500) is arranged on the common conveying belt (300) to obtain the actual volume flow of the tobacco material on the common conveying belt (300).

5. A control device for the outflow volumetric flow of a process tank according to claim 4, characterized in that The support (400) is arranged below and above the common conveying belt (300) and is horizontally arranged above the common conveying belt (300) and is in non-contact with the common conveying belt (300). The bulk flow meter (500) is arranged on the support (400) and above the common conveying belt (300).

6. A control device for the outflow volumetric flow of a process tank according to claim 4, characterized in that The laser line scanner is arranged above the inside of the process silo (100) to obtain the real-time thickness of the tobacco material in the process silo (100).

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