Tobacco constant flow control system and control method

Abstract

The invention discloses a tobacco constant flow control system and a control method, which belong to the technical field of automation control of tobacco equipment and are characterized in that PID (proportion integration differentiation) regulation is carried out on instantaneous flow of an electronic scale and set flow of the electronic scale, and a speed regulation signal is output according to the PID regulation to regulate the speed of a motor of the electronic scale; and the relation between the instantaneous flow of the electronic scale and the set flow precision range and the activation regulation and control range is judged, and different control strategies are adopted for high-angle belt motor speed regulation. The speed of the high-angle belt motor is matched with the speed of the electronic scale motor while the constant material flow of the electronic scale is ensured, the materials supplied to the electronic scale are always stabilized in the middle of the metering tube, the material accumulation on the electronic scale is kept unchanged, the materials of subsequent equipment are not caked, the flow is constant, and the working efficiency is improved. And the high-angle belt is continuously fed and is not frequently started and stopped.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic control of tobacco equipment, and in particular relates to a tobacco constant flow control system and a control method. Background Art

[0002] The tobacco constant flow system refers to an equipment system composed of electronic scales, metering tubes, and feeders on the process production line of the tobacco industry. The traditional control method of this equipment system is that the process line electronic control system collects the flow signal of the electronic scale, the photoelectric tube signal of the metering tube and the bottom belt of the feeder to control the steep angle belt and bottom belt of the feeder to achieve constant feeding of the electronic scale to ensure that the material flow through the electronic belt scale is uniform and stable. Usually, the electronic scale is an independent control small system, and the feeder and metering tube are included in the whole line electronic control program control.

[0003] However, the existing technology has the following shortcomings: 1) The accumulation of materials at different positions in the metering tube will cause different bulk densities of materials from the discharge port to the electronic scale. When the electronic scale adjusts the speed, it will cause the steep angle belt of the front-stage feeder to start and stop frequently, and the material provided to the subsequent equipment (such as the silk drying machine) will clump, resulting in uneven operation quality; 2) The existing line-controlled electronic control system is based on the whole-line electronic control program, that is, the PLC module design, and the PLC cannot handle complex algorithms. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention is implemented by the following technical solutions:

[0005] In a first aspect of the present invention, a tobacco constant flow control method is provided, comprising the following steps:

[0006] The instantaneous flow rate of the electronic scale and the set flow rate of the electronic scale are PID regulated, and the speed of the electronic scale motor is regulated according to the speed regulation signal output by the PID regulation to obtain the regulated speed of the electronic scale motor;

[0007] Determine whether the instantaneous flow of the electronic scale is within the accuracy range of the flow set by the electronic scale. If it exceeds the accuracy range of the flow set by the electronic scale, determine whether the instantaneous flow of the electronic scale is within the flow range of the electronic scale activation control.

[0008] When the instantaneous flow of the electronic scale is within the accuracy range of the set flow of the electronic scale, the steep angle belt motor speed is adjusted according to the fixed adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed; when the instantaneous flow of the electronic scale exceeds the accuracy range of the set flow of the electronic scale and is within the flow range of the activation control of the electronic scale, the steep angle belt motor speed is adjusted according to the fixed adjustment ratio of the steep angle belt motor, the compensation adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed; when the instantaneous flow of the electronic scale exceeds the flow range of the activation control of the electronic scale, the steep angle belt motor speed is adjusted according to the set upper and lower limits of the speed.

[0009] Furthermore, the instantaneous flow rate of the electronic scale is calculated by the weight of the material on the electronic scale and the speed of the electronic scale motor. The calculation formula of the instantaneous flow rate of the electronic scale is:

[0010]

[0011] Among them, Qn is the instantaneous flow rate of the electronic scale, P is the weight of the material on the electronic scale, V is the motor speed of the electronic scale, and L is the length of the measuring section.

[0012] Furthermore, the flow range calculation formula for the electronic scale activation control is:

[0013] Lower=SP_Flow×(100-FlowDev) / 100

[0014] Upper=SP_Flow×(100+FlowDev) / 100

[0015] Among them, Lower is the lower limit of the flow range for activation control, Upper is the upper limit of the flow range for activation control, SP_Flow is the flow set by the electronic scale, and FlowDev is the flow range of the set fixed activation control.

[0016] Furthermore, the accuracy range of the flow rate set by the electronic scale is 1%, and the accuracy range of the flow rate set by the electronic scale is smaller than the flow range of the activation control.

[0017] Furthermore, the steep angle belt motor speed adjustment is implemented according to the fixed adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed as follows:

[0018] ElevatorSP_Speed=Kp*PV_CK_Speed

[0019] Among them, ElevatorSP_Speed ​​is the steep angle belt motor speed, Kp is the steep angle belt motor fixed adjustment ratio, and PV_CK_Speed ​​is the adjusted electronic scale motor speed.

[0020] Furthermore, the steep angle belt motor speed adjustment is implemented according to the steep angle belt motor fixed adjustment ratio, the steep angle belt motor compensation adjustment ratio and the adjusted electronic scale motor speed as follows:

[0021] ElevatorSP_Speed1=K1*PV_CK_Speed

[0022] K1=Kp+Ka1

[0023] ElevatorSP_Speed2=K2*PV_CK_Speed

[0024] K2=Kp+Ka2

[0025] Among them, ElevatorSP_Speed1 is the speed of the steep angle motor when there is a lack of material, K1 is the comprehensive adjustment ratio of the steep angle motor when there is a lack of material, and Ka1 is the compensation adjustment ratio of the steep angle motor when there is a lack of material; ElevatorSP_Speed2 is the speed of the steep angle motor when there is more material, K2 is the comprehensive adjustment ratio of the steep angle motor when there is more material, and Ka2 is the compensation adjustment ratio of the steep angle motor when there is more material; PV_CK_Speed ​​is the adjusted electronic scale motor speed.

[0026] Furthermore, the compensation adjustment ratios of the steep angle belt motor when there is a lack of material and the compensation adjustment ratios of the steep angle belt motor when there is more material are respectively:

[0027] Ka1=Ka+n*Sadd

[0028] Ka2=Ka-n*Ssub

[0029] Among them, Ka1 is the compensation adjustment ratio of the steep angle belt motor when there is a shortage of material, Ka2 is the compensation adjustment ratio of the steep angle belt motor when there is more material, Ka is the compensation adjustment ratio, n is the step adjustment parameter, Sadd is the acceleration step of the steep angle belt motor, and Ssub is the deceleration step of the steep angle belt motor.

[0030] In a second aspect of the present invention, a tobacco constant flow control system is provided, comprising an electronic scale motor, a metering tube, a feeder and a steep angle belt motor, and also comprising a controller, the controller comprising an electronic scale flow control module, a metering tube material level detection and evaluation module and a metering tube in-material level control module;

[0031] The electronic scale flow control module is used to perform PID regulation on the instantaneous flow of the electronic scale and the set flow of the electronic scale, and adjust the speed of the electronic scale motor according to the PID regulation output speed regulation signal to obtain the adjusted electronic scale motor speed;

[0032] The metering tube material level detection and evaluation module is used to determine whether the instantaneous flow of the electronic scale is within the accuracy range of the flow set by the electronic scale. When the accuracy range of the flow set by the electronic scale is exceeded, it is used to determine whether the instantaneous flow of the electronic scale is within the flow range of activation control set by the electronic scale.

[0033] The material level control module in the metering tube is used to adjust the steep angle belt motor speed according to the fixed adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed when the instantaneous flow of the electronic scale is within the accuracy range of the set flow of the electronic scale; when the instantaneous flow of the electronic scale exceeds the accuracy range of the set flow of the electronic scale and is within the activation control range, the steep angle belt motor speed is adjusted according to the fixed adjustment ratio of the steep angle belt motor, the compensation adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed; when the instantaneous flow of the electronic scale exceeds the activation control range, the steep angle belt motor speed is adjusted according to the set upper and lower limits of the speed.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The electronic scale flow control module in the controller of the present invention realizes speed control of the electronic scale motor so that the electronic scale is maintained at a set constant flow rate. At the same time, the metering tube material level detection and evaluation module is used to judge the relationship between the instantaneous flow rate of the electronic scale and the accuracy range of the set flow rate and the flow range of the activated control and the material level evaluation result. The steep angle belt motor speed is controlled by the material level control module in the metering tube so that the steep angle belt motor speed matches the electronic scale motor speed. At the same time, the situations of lack of material and excess material in the metering tube are taken into consideration, ensuring that the material supplied to the electronic scale is always stable in the middle of the metering tube, so that the material accumulation on the electronic scale remains unchanged, ensuring that the material of the subsequent equipment does not clump and the flow rate is constant, and the steep angle belt continues to feed without frequent start and stop.

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic flow chart of a tobacco constant flow control method provided by an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of a tobacco constant flow control system provided by an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the principle of an electronic scale flow control module in a tobacco constant flow control system provided by an embodiment of the present invention;

[0040] Figure 4 The present invention is a schematic diagram of the principle of a material level control module in a metering tube in a tobacco constant flow control system provided by an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 1-Electronic scale motor; 2-Measuring tube; 3-Feeder; 4-Steep angle belt motor; 5-Controller. DETAILED DESCRIPTION

[0043] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the scheme according to the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0044] The above and other technical contents, features and effects of the present invention are clearly presented in the following detailed description of the specific implementation modes in conjunction with the accompanying drawings. Through the description of the specific implementation modes, the technical means and effects adopted by the present invention to achieve the predetermined purpose can be more deeply and specifically understood. However, the attached drawings are only for reference and explanation purposes and are not used to limit the technical solutions of the present invention.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed. In the absence of more restrictions, the elements defined by the statement "including one..." do not exclude the existence of other identical elements in the article or device including the elements.

[0046] like Figure 1 As shown, a tobacco constant flow control method provided by an embodiment of the present invention comprises the following steps:

[0047] Step 1. Perform PID adjustment on the instantaneous flow Qn of the electronic scale and the set flow Qp of the electronic scale. According to the PID adjustment output speed regulation signal, adjust the speed of the electronic scale motor to obtain the adjusted speed of the electronic scale motor. By adjusting the speed of the electronic scale motor, the requirement of constant flow of the electronic scale is achieved.

[0048] The material weight of the electronic scale is detected by the weighing sensor, and the belt speed of the electronic scale, i.e. the speed of the electronic scale, is measured by the speed sensor. The instantaneous flow of the electronic scale is calculated by the material weight on the electronic scale and the motor speed of the electronic scale. The calculation formula of the instantaneous flow of the electronic scale is:

[0049]

[0050] Among them, Qn is the instantaneous flow rate of the electronic scale, P is the weight of the material on the electronic scale, V is the motor speed of the electronic scale, and L is the length of the measuring section.

[0051] Step 2: determine whether the instantaneous flow of the electronic scale is within the accuracy range of the flow set by the electronic scale. If it exceeds the accuracy range of the flow set by the electronic scale, determine whether the instantaneous flow of the electronic scale is within the flow range of the electronic scale activation control.

[0052] Among them, the calculation formula for the flow range of activation control set by the electronic scale is:

[0053] Lower=SP_Flow×(100-FlowDev) / 100

[0054] Upper=SP_Flow×(100+FlowDev) / 100

[0055] Among them, Lower is the lower limit of the flow range for activation control, Upper is the upper limit of the flow range for activation control, SP_Flow is the flow set by the electronic scale, and FlowDev is the flow range of the set fixed activation control.

[0056] The accuracy range of the flow rate set by the electronic scale is 1%, and the accuracy range of the flow rate set by the electronic scale is smaller than the flow range of the activated control.

[0057] Step 3: When the instantaneous flow rate of the electronic scale is within the accuracy range of the set flow rate of the electronic scale, the steep angle belt motor speed is adjusted according to the fixed adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed as follows:

[0058] ElevatorSP_Speed=Kp*PV_CK_Speed

[0059] Among them, ElevatorSP_Speed ​​is the steep angle belt motor speed, Kp is the steep angle belt motor fixed adjustment ratio, and PV_CK_Speed ​​is the adjusted electronic scale motor speed.

[0060] When the instantaneous flow of the electronic scale exceeds the accuracy range of the set flow of the electronic scale and is within the flow range of the activation control of the electronic scale, the steep angle belt motor speed is adjusted according to the fixed adjustment ratio of the steep angle belt motor, the compensation adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed.

[0061] The implementation method of adjusting the speed of the steep angle belt motor according to the fixed adjustment ratio of the steep angle belt motor, the compensation adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed is as follows:

[0062] ElevatorSP_Speed1=K1*PV_CK_Speed

[0063] K1=Kp+Ka1

[0064] ElevatorSP_Speed2=K2*PV_CK_Speed

[0065] K2=Kp+Ka2

[0066] Among them, ElevatorSP_Speed1 is the speed of the steep angle motor when there is a lack of material, K1 is the comprehensive adjustment ratio of the steep angle motor when there is a lack of material, and Ka1 is the compensation adjustment ratio of the steep angle motor when there is a lack of material; ElevatorSP_Speed2 is the speed of the steep angle motor when there is more material, K2 is the comprehensive adjustment ratio of the steep angle motor when there is more material, and Ka2 is the compensation adjustment ratio of the steep angle motor when there is more material; PV_CK_Speed ​​is the adjusted electronic scale motor speed.

[0067] Furthermore, the compensation adjustment ratios of the steep angle belt motor when there is a lack of material and the compensation adjustment ratios of the steep angle belt motor when there is more material are respectively:

[0068] Ka1=Ka+n*Sadd

[0069] Ka2=Ka-n*Ssub

[0070] Among them, Ka1 is the compensation adjustment ratio of the steep angle belt motor when there is a shortage of material, Ka2 is the compensation adjustment ratio of the steep angle belt motor when there is more material, Ka is the compensation adjustment ratio, n is the step adjustment parameter, Sadd is the acceleration step of the steep angle belt motor, and Ssub is the deceleration step of the steep angle belt motor.

[0071] When the instantaneous flow of the electronic scale exceeds the activation control range, the steep angle belt motor adjusts the speed according to the set upper and lower speed limits.

[0072] like Figure 2 As shown, it is a schematic diagram of a tobacco constant flow control system provided by an embodiment of the present invention, the tobacco constant flow control system includes an electronic scale motor, a metering tube, a feeder and a steep angle belt motor, and also includes a controller, the controller includes an electronic scale flow control module, a metering tube material level detection and evaluation module and a metering tube in-material level control module.

[0073] The electronic scale flow control module is used to perform PID regulation on the instantaneous flow of the electronic scale and the set flow of the electronic scale, and adjust the speed of the electronic scale motor according to the PID regulation output speed regulation signal to obtain the adjusted electronic scale motor speed.

[0074] like Figure 3 As shown, it is a schematic diagram of the principle of an electronic scale flow control module in a tobacco constant flow control system provided by an embodiment of the present invention. The electronic scale flow control module in the controller receives the electronic scale set flow Qp from the line control PLC; the electronic scale flow control module in the controller obtains the material weight of the electronic scale detected by the weighing sensor and the electronic scale belt speed measured by the speed sensor, that is, the electronic scale speed, to calculate the instantaneous flow Qn of the electronic scale, and the calculation formula is:

[0075]

[0076] Among them, Qn is the instantaneous flow rate of the electronic scale, P is the weight of the material on the electronic scale, V is the motor speed of the electronic scale, and L is the length of the measuring section.

[0077] The electronic scale flow control module in the controller performs PID adjustment on the instantaneous flow Qn of the electronic scale and the set flow Qp of the electronic scale. According to the PID adjustment output speed regulation signal, the electronic scale motor speed is adjusted by adjusting the frequency converter to obtain the adjusted electronic scale motor speed, thereby achieving the requirement of constant flow of the electronic scale.

[0078] In the existing tobacco constant flow control system, when the metering tube and the electronic scale enter the production state and the material completely enters the electronic scale, the metering tube material level detection and evaluation module is used to determine whether the instantaneous flow of the electronic scale is within the accuracy range of the electronic scale set flow. When it exceeds the accuracy range of the electronic scale set flow, it determines whether the instantaneous flow of the electronic scale is within the flow range of the electronic scale activation control. At the same time, the material level evaluation result is obtained according to the delay time of the material blocking the high material level photoelectric tube, the middle material level photoelectric tube and the low material level photoelectric tube, providing a control basis for the material level control module in the metering tube.

[0079] Among them, the calculation formula for the flow range of activation control set by the electronic scale is:

[0080] Lower=SP_Flow×(100-FlowDev) / 100

[0081] Upper=SP_Flow×(100+FlowDev) / 100

[0082] Among them, Lower is the lower limit of the flow range for activation control, Upper is the upper limit of the flow range for activation control, SP_Flow is the flow set by the electronic scale, and FlowDev is the flow range of the set fixed activation control.

[0083] The accuracy range of the flow rate set by the electronic scale is 1%, and the accuracy range of the flow rate set by the electronic scale is smaller than the flow range of the activated control.

[0084] The material level control module in the metering tube is used to adjust the steep angle belt motor speed according to the fixed adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed when the instantaneous flow of the electronic scale is within the accuracy range of the set flow of the electronic scale; when the instantaneous flow of the electronic scale exceeds the accuracy range of the set flow of the electronic scale and is within the activation control range, the steep angle belt motor speed is adjusted according to the fixed adjustment ratio of the steep angle belt motor, the compensation adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed; when the instantaneous flow of the electronic scale exceeds the activation control range, the steep angle belt motor speed is adjusted according to the set upper and lower limits of the speed.

[0085] The material level control module in the metering tube is used to adjust the steep angle belt motor speed according to the fixed adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed when the instantaneous flow of the electronic scale is within the accuracy range of the flow set by the electronic scale.

[0086] As shown in Table 1, the fixed adjustment ratio of the steep-angle belt motor provided by the embodiment of the present invention is as follows:

[0087] Table 1:

[0088]

[0089] The implementation method of adjusting the speed of the steep angle belt motor according to the fixed adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed is as follows:

[0090] ElevatorSP_Speed=Kp*PV_CK_Speed

[0091] Among them, ElevatorSP_Speed ​​is the steep angle belt motor speed, Kp is the steep angle belt motor fixed adjustment ratio, and PV_CK_Speed ​​is the adjusted electronic scale motor speed.

[0092] The material level control module in the metering tube is used to adjust the steep angle belt motor speed according to the fixed adjustment ratio of the steep angle belt motor, the compensation adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed when the instantaneous flow of the electronic scale exceeds the accuracy range of the set flow of the electronic scale and is within the activation control range.

[0093] The implementation method of adjusting the speed of the steep angle belt motor according to the fixed adjustment ratio of the steep angle belt motor, the compensation adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed is as follows:

[0094] ElevatorSP_Speed1=K1*PV_CK_Speed

[0095] K1=Kp+Ka1

[0096] ElevatorSP_Speed2=K2*PV_CK_Speed

[0097] K2=Kp+Ka2

[0098] Among them, ElevatorSP_Speed1 is the speed of the steep angle motor when there is a lack of material, K1 is the comprehensive adjustment ratio of the steep angle motor when there is a lack of material, and Ka1 is the compensation adjustment ratio of the steep angle motor when there is a lack of material; ElevatorSP_Speed2 is the speed of the steep angle motor when there is more material, K2 is the comprehensive adjustment ratio of the steep angle motor when there is more material, and Ka2 is the compensation adjustment ratio of the steep angle motor when there is more material; PV_CK_Speed ​​is the adjusted electronic scale motor speed.

[0099] Furthermore, the compensation adjustment ratios of the steep angle belt motor when there is a lack of material and the compensation adjustment ratios of the steep angle belt motor when there is more material are respectively:

[0100] Ka1=Ka+n*Sadd

[0101] Ka2=Ka-n*Ssub

[0102] Among them, Ka1 is the compensation adjustment ratio of the steep angle belt motor when there is a shortage of material, Ka2 is the compensation adjustment ratio of the steep angle belt motor when there is more material, Ka is the compensation adjustment ratio, n is the step adjustment parameter, Sadd is the acceleration step of the steep angle belt motor, and Ssub is the deceleration step of the steep angle belt motor.

[0103] The material level control module in the metering tube is also used to adjust the speed of the steep angle belt motor according to the set upper and lower speed limits when the instantaneous flow of the electronic scale exceeds the activation control range.

[0104] As shown in Table 2, the fixed adjustment ratio of the steep-angle belt motor and the compensation adjustment ratio of the steep-angle belt motor provided in the embodiment of the present invention are as follows:

[0105] Table 2:

[0106]

[0107] like Figure 4 As shown, it is a schematic diagram of the principle of a material level control module in a metering tube in a tobacco constant flow control system provided by an embodiment of the present invention. The material level control module in the metering tube determines whether the metering tube is in a material shortage state or a material excess state by obtaining the shielding state and shielding delay time of the high material level photoelectric tube, the middle material level photoelectric tube, and the low material level photoelectric tube in the metering tube obtained by the metering tube material level detection and evaluation module. Specifically, when it is obtained that the low material level photoelectric tube is blocked and the shielding delay time exceeds 1 second, it means that the metering tube is short of material. When the material level control module obtains the high material level photoelectric tube, the middle material level photoelectric tube, and the low material level photoelectric tube, the material level detection and evaluation module determines whether the metering tube is in a material shortage state or a material excess state. If all photoelectric tubes are blocked and the blocking delay time exceeds 1.5 seconds, it means that there is too much material in the metering tube; the steep angle belt motor compensation adjustment ratio includes the steep angle belt motor compensation adjustment ratio Ka1 when there is a lack of material and the steep angle belt motor comprehensive adjustment ratio Ka2 when there is too much material. According to Ka1, the steep angle belt motor comprehensive adjustment ratio K1 when there is a lack of material is obtained, and according to Ka2, the steep angle belt motor comprehensive adjustment ratio K2 when there is too much material is obtained. The material level control module in the metering tube adjusts the steep angle belt motor speed by adjusting the frequency converter according to the steep angle belt motor fixed adjustment ratio, the steep angle belt motor compensation adjustment ratio and the adjusted electronic scale motor speed. This ensures that the material supplied to the electronic scale is stable in the middle of the metering tube, so that the material accumulation density on the electronic scale remains unchanged, so as to ensure that the material provided to the subsequent equipment is uniform and the flow rate is constant, thereby improving the moisture control of subsequent equipment such as the rehumidifier and the silk drying machine, and the spice control accuracy of the flavoring feeder.

[0108] As shown in Table 3, the compensation adjustment ratio of the steep angle belt motor when the metering tube is short of material and when the metering tube is full of material:

[0109] Table 3:

[0110]

[0111] Among them, the status of the high material level photoelectric tube, the middle material level photoelectric tube and the low material level photoelectric tube is 1, which means they are blocked, and 0, which means they are not blocked.

[0112] The present invention separates the controller from the line-controlled PLC, reduces the pressure of the line-controlled PLC, and realizes the transformation from centralized control to unit-level control; the speed control of the electronic scale motor is realized by the electronic scale flow control module in the controller so that the electronic scale is maintained at a set constant flow rate, and at the same time, the metering tube material level detection and evaluation module is used to judge the relationship between the instantaneous flow rate of the electronic scale and the accuracy range of the set flow rate and the size of the flow range of the activated control and the material level evaluation result, and the material level control module in the metering tube is adjusted according to different situations so that the speed of the steep angle belt motor matches the speed of the electronic scale motor, and at the same time, the situations of lack of material and excess material in the metering tube are taken into consideration, so that the material supplied to the electronic scale is always stable in the middle of the metering tube, so that the material accumulation on the electronic scale remains unchanged, and it is ensured that the material of the subsequent equipment does not agglomerate and the flow rate is constant, and the steep angle belt continues to feed without frequent start and stop.

[0113] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A tobacco constant flow control method, characterized in that: The following steps are involved: The instantaneous flow rate of the electronic scale and the set flow rate of the electronic scale are PID regulated, and the speed of the electronic scale motor is regulated according to the speed regulation signal output by the PID regulation to obtain the regulated speed of the electronic scale motor; Determine whether the instantaneous flow of the electronic scale is within the accuracy range of the flow set by the electronic scale. If the flow exceeds the accuracy range of the flow set by the electronic scale, determine whether the instantaneous flow of the electronic scale is within the flow range of the electronic scale activation control. When the instantaneous flow of the electronic scale is within the accuracy range of the set flow of the electronic scale, the steep angle belt motor speed is adjusted according to the fixed adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed; when the instantaneous flow of the electronic scale exceeds the accuracy range of the set flow of the electronic scale and is within the flow range of the activation control of the electronic scale, the steep angle belt motor speed is adjusted according to the fixed adjustment ratio of the steep angle belt motor, the compensation adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed; when the instantaneous flow of the electronic scale exceeds the flow range of the activation control of the electronic scale, the steep angle belt motor speed is adjusted according to the set upper and lower limits of the speed.

2. A tobacco constant flow control method according to claim 1, characterized in that: The instantaneous flow rate of the electronic scale is calculated by the weight of the material on the electronic scale and the speed of the electronic scale motor. The calculation formula of the instantaneous flow rate of the electronic scale is: Among them, Qn is the instantaneous flow rate of the electronic scale, P is the weight of the material on the electronic scale, V is the motor speed of the electronic scale, and L is the length of the measuring section.

3. A tobacco constant flow control method according to claim 1, characterized in that: The calculation formula for the flow range of the electronic scale activation control is: Lower=SP_Flow×(100-FlowDev) / 100 Upper=SP_Flow×(100+FlowDev) / 100 Among them, Lower is the lower limit of the flow range for activation control, Upper is the upper limit of the flow range for activation control, SP_Flow is the flow set by the electronic scale, and FlowDev is the flow range of the set fixed activation control.

4. A tobacco constant flow control method according to claim 1, characterized in that: The accuracy range of the flow rate set by the electronic scale is 1%, and the accuracy range of the flow rate set by the electronic scale is smaller than the flow rate range of the activation control of the electronic scale.

5. A tobacco constant flow control method according to claim 1, characterized in that: The implementation method of adjusting the speed of the steep angle belt motor according to the fixed adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed is as follows: ElevatorSP_Speed=Kp*PV_CK_Speed Among them, ElevatorSP_Speed ​​is the steep angle belt motor speed, Kp is the steep angle belt motor fixed adjustment ratio, and PV_CK_Speed ​​is the adjusted electronic scale motor speed.

6. A tobacco constant flow control method according to claim 1, characterized in that: The implementation method of adjusting the speed of the steep angle belt motor according to the fixed adjustment ratio of the steep angle belt motor, the compensation adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed is as follows: ElevatorSP_Speed1=K1*PV_CK_Speed K1=Kp+Ka1 ElevatorSP_Speed2=K2*PV_CK_Speed K2=Kp+Ka2 Among them, ElevatorSP_Speed1 is the speed of the steep angle motor when there is a lack of material, K1 is the comprehensive adjustment ratio of the steep angle motor when there is a lack of material, and Ka1 is the compensation adjustment ratio of the steep angle motor when there is a lack of material; ElevatorSP_Speed2 is the speed of the steep angle motor when there is more material, K2 is the comprehensive adjustment ratio of the steep angle motor when there is more material, and Ka2 is the compensation adjustment ratio of the steep angle motor when there is more material; PV_CK_Speed ​​is the adjusted electronic scale motor speed.

7. A tobacco constant flow control method according to claim 6, characterized in that: The compensation adjustment ratio of the steep angle belt motor when there is a lack of material and the compensation adjustment ratio of the steep angle belt motor when there is more material are respectively: Ka1=Ka+n*Sadd Ka2=Ka-n*Ssub Among them, Ka1 is the compensation adjustment ratio of the steep angle belt motor when there is a shortage of material, Ka2 is the compensation adjustment ratio of the steep angle belt motor when there is more material, Ka is the compensation adjustment ratio, n is the step adjustment parameter, Sadd is the acceleration step of the steep angle belt motor, and Ssub is the deceleration step of the steep angle belt motor.

8. A tobacco constant flow control system, comprising an electronic scale motor, a metering tube, a feeder and a steep angle belt motor, characterized in that: It also includes a controller, which includes an electronic scale flow control module, a metering tube material level detection and evaluation module, and a metering tube material level control module; The electronic scale flow control module is used to perform PID regulation on the instantaneous flow of the electronic scale and the set flow of the electronic scale, and to adjust the speed of the electronic scale motor according to the PID regulation output speed regulation signal to obtain the adjusted electronic scale motor speed; The metering tube material level detection and evaluation module is used to determine whether the instantaneous flow of the electronic scale is within the accuracy range of the flow set by the electronic scale, and when it exceeds the accuracy range of the flow set by the electronic scale, determine whether the instantaneous flow of the electronic scale is within the flow range of the electronic scale activation control; The material level control module in the metering tube is used to adjust the steep angle belt motor speed according to the fixed adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed when the instantaneous flow of the electronic scale is within the accuracy range of the set flow of the electronic scale; adjust the steep angle belt motor speed according to the fixed adjustment ratio of the steep angle belt motor, the compensation adjustment ratio of the steep angle belt motor and the adjusted electronic scale motor speed when the instantaneous flow of the electronic scale exceeds the accuracy range of the set flow of the electronic scale and is within the flow range of the activation control of the electronic scale; when the instantaneous flow of the electronic scale exceeds the flow range of the activation control of the electronic scale, the steep angle belt motor is adjusted according to the set upper and lower limits of the speed.

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