A method of speed control for a tobacco industry feeder elevator belt without a doser tube

Abstract

The present application belongs to the technical field of tobacco production, and particularly relates to a speed control method for a tobacco industry feeding machine lifting belt without a constant tube, and the specific steps are as follows: counting the constant tube of the feeding machine lifting belt provided with a constant tube, counting the running speed of the electronic scale when the constant tube triggers the high material position, the medium material position and the low material position signals; the feeding machine system controller acquires the instant running speed data of the electronic scale; the feeding machine system controller judges, if the instant speed of the electronic scale is greater than the statistical low material position electronic scale speed, the feeding machine system controller controls the feeding machine lifting belt to increase the speed; if the instant speed of the electronic scale is less than the statistical high material position electronic scale speed, the feeding machine system controller controls the feeding machine lifting belt to reduce the speed or stop running. The technical scheme directly removes the constant tube without increasing any other equipment, and still can realize the automatic speed control of the feeding machine lifting belt, improve the production stability, and ensure the production quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of tobacco production, and particularly relates to a speed control method for the lifting belt of a feeder in the tobacco industry without a metering tube. Background Art

[0002] The feeder in the tobacco industry is an important device to ensure continuous production and uniform material flow. It is one of the most frequently used devices in the tobacco industry. Generally, the feeder is used in conjunction with a metering tube. When there is a large amount of material accumulated on the downstream electronic scale, the high-level signal of the metering tube is blocked, and the lifting belt of the feeder stops running to prevent material accumulation and blockage. When there is a shortage of material on the downstream electronic scale, the low-level signal of the metering tube is exposed, and the lifting belt of the feeder speeds up to prevent material shortage in the downstream equipment. However, in actual operation, due to the light weight of the tobacco flakes and slow falling speed, the high-level signal may be blocked, resulting in the stoppage of the electronic belt scale of the feeder when the material is lacking on the downstream electronic scale, causing a material flow interruption. At the same time, when the inner wall of the metering tube is dirty or the photoelectric sensor for level detection is stained, misoperation may occur, affecting normal production. Summary of the Invention

[0003] The purpose of the present invention is to provide a speed control method for the lifting belt of a feeder in the tobacco industry without a metering tube to solve the problems in the above background art.

[0004] To achieve the above purpose, the present application is realized through the following technical solutions:

[0005] A speed control method for the lifting belt of a feeder in the tobacco industry without a metering tube includes the following steps:

[0006] S1. During a first set time, count the metering tube of the lifting belt of the feeder equipped with a metering tube, and count the running speeds of the electronic scale when the level signals of the high level, medium level, and low level of the metering tube are triggered, and mark them as vh, vm, and vl respectively;

[0007] S2. The feeder system controller obtains the instant running speed data of the electronic scale and marks it as vv;

[0008] S3. The feeder system controller judges that if vv > vl, it indicates that the accumulated material on the electronic scale is less than the lower limit of the specified quantity at this time, and the feeder system controller controls the lifting belt of the feeder to increase the speed; if vv < vh, it indicates that the accumulated material on the electronic scale is greater than the upper limit of the specified data at this time, and the feeder system controller controls the lifting belt of the feeder to reduce the speed or stop running.

[0009] Further, in step S1, the running speed vh of the electronic scale at the high level, the running speed vm of the electronic scale at the medium level, and the running speed vl of the electronic scale at the low level are all the average speeds within the first set time.

[0010] Further, in step S1, it also includes, within a first set time, statistically calculating the average speed vt of the feeder elevator belt when the metering tube is between the high material level and the low material level, statistically calculating the instantaneous average speed vp of the feeder elevator belt when the metering tube reaches the high material level, and statistically calculating the instantaneous average speed vd of the feeder elevator belt when the metering tube drops to the low material level.

[0011] Further, in step S3, if vv > vl, the feeder system controller controls the speed of the feeder elevator belt to increase to vp(1 + n%), and then every second set time, the feeder system controller controls the speed of the feeder elevator belt to decrease by k% of the speed vp(1 + n%), until it decreases to vt and then maintains this speed.

[0012] Further, in step S3, if vv < vh, the feeder system controller controls the speed of the feeder elevator belt to decrease to vd(1 + n%), and then every second set time, the feeder system controller controls the speed of the feeder elevator belt to increase by k% of the speed vd(1 + n%), until it increases to vt and then maintains this speed.

[0013] Further, the feeder system controller and the electronic scale controller are electrically connected by signals, and both are PLC controllers.

[0014] The beneficial effects of the present invention are as follows:

[0015] Through this technical solution, without adding any other equipment, the metering tube is directly removed, and the automatic speed control of the feeder elevator belt can still be achieved, improving production stability, ensuring production quality, reducing equipment costs, and having good promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flowchart of the method for controlling the speed of the feeder elevator belt without a metering tube in the tobacco industry of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, rather than being construed as a limitation to the technical solution of the present invention.

[0018] The control method of the present application is an improved control method for the existing tobacco enterprises in a system including a feeder elevator belt, a metering tube, and an electronic scale in the feeder, without adding any other equipment, only removing the metering tube. Therefore, the technical solution of the present application is not applicable to a system with a metering tube or a similar metering device.

[0019] Such as Figure 1As shown in the figure, the present application provides a method for controlling the speed of the hoisting belt of a feeder in the tobacco industry without a metering tube, which includes the following steps:

[0020] S1. During the first set time, count the metering tubes of the hoisting belt of the feeder equipped with a metering tube, and count the running speeds of the electronic scales when the metering tube triggers the three material level signals of high material level, medium material level and low material level, and mark them as vh, vm, and vl respectively. The main purpose of this step is to obtain the running speeds of the electronic scales at different material levels when there is a metering tube. In the present application, the first set time usually selects long-term data to ensure the accuracy of the data and reduce errors. Under normal circumstances, selecting a time of more than 24 hours can ensure the accuracy of the data, and the selected time should be under the condition that the production line is relatively balanced. If the production line fluctuates, it is not suitable for data determination. Of course, when the requirement is not precise, selecting a time of more than 4 hours is also possible. And the high material level vh, medium material level vm and low material level vl here all refer to the average values of all relevant data within the first set time range, that is, they are all average speeds.

[0021] In the technical solution of the present application, it also includes counting the average speed vt of the hoisting belt of the feeder when the metering tube is between the high material level and the low material level within the first set time, counting the instant average speed vp of the hoisting belt of the feeder when the metering tube reaches the high material level, and counting the instant average speed vd of the hoisting belt of the feeder when the metering tube drops to the low material level. Because according to the conventional understanding, under normal production conditions, the material level in the metering tube should remain relatively stable within a certain range. However, when there is a high material level or a low material level, it may also be caused by the change in the running speed of the hoisting belt of the feeder. Therefore, in the technical solution of the present application, it can also involve the statistics of the speed of the hoisting belt of the feeder.

[0022] S2. The feeder system controller obtains the instant running speed data of the electronic scale and marks it as vv; the instant running speed of the electronic scale is taken by the PLC controller of the electronic scale and then transmitted to the feeder system controller, that is, the PLC controller of the feeder system. Since the electronic scale adopts constant flow control, the total amount of materials transported by the electronic scale per unit time is certain. When the material accumulation is less, the electronic scale speeds up, and when the material accumulation is more, the electronic scale slows down. Therefore, by judging the running speed of the electronic scale, it is possible to judge the material accumulation situation on the electronic scale, which can be used to guide the speed control of the hoisting belt of the feeder.

[0023] S3. The feeder system controller judges that if vv>vl, it indicates that the material accumulated on the electronic scale at this time is less than the lower limit of the specified quantity, and the feeder system controller controls the hoisting belt of the feeder to increase the speed; if vv<vh, it indicates that the material accumulated on the electronic scale at this time is greater than the upper limit of the specified data, and the feeder system controller controls the hoisting belt of the feeder to reduce the speed or stop running.

[0024] In this application, when vv > vl, the feeder system controller controls the speed of the feeder lifting belt to increase to vp(1 + n%), and then every second set time, the feeder system controller controls the speed of the feeder lifting belt to decrease by k% of the speed of vp(1 + n%) until it decreases to vt and maintains this speed. In this application, the second set time is usually within the range of 0.2 seconds to 2 seconds. Specifically, 0.3 seconds, 0.5 seconds, 1 second, 1.2 seconds, 1.5 seconds, 2 seconds, etc. can be selected. As for the actual second set time, those skilled in the art can determine it according to actual production and after repeated verification; n in this application is a positive number greater than 0.

[0025] In this application, when vv < vh, the feeder system controller controls the speed of the feeder lifting belt to decrease to vd(1 + n%), and then every second set time, the feeder system controller controls the speed of the feeder lifting belt to increase by k% of the speed of vd(1 + n%) until it increases to vt and maintains this speed.

[0026] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A method for controlling the speed of the lifting belt of a feeder in the tobacco industry, characterized in that, It includes the following steps: S1. During the first set time, count the metering tubes of the feeding machine lifting belt equipped with metering tubes, and count the running speeds of the electronic scales when the metering tubes are triggered by the high-level, medium-level, and low-level signal indicators, and mark them as vh, vm, and vl respectively; S2. The feeding machine system controller obtains the instant running speed data of the electronic scale and marks it as vv; S3. The feeding machine system controller judges that if vv > vl, it indicates that the accumulated materials on the electronic scale are less than the lower limit of the specified quantity at this time, and the feeding machine system controller controls the feeding machine lifting belt to increase the speed; if vv < vh, it indicates that the accumulated materials on the electronic scale are greater than the upper limit of the specified data at this time, and the feeding machine system controller controls the feeding machine lifting belt to reduce the speed; In step S1, it also includes counting the average speed vt of the feeding machine lifting belt when the metering tube is between the high level and the low level during the first set time, counting the instant average speed vp of the feeding machine lifting belt when the metering tube reaches the high level, and counting the instant average speed vd of the feeding machine lifting belt when the metering tube drops to the low level; In step S3, if vv > vl, the feeding machine system controller controls the speed of the feeding machine lifting belt to increase to vp(1 + n%), and then every second set time, the feeding machine system controller controls the speed of the feeding machine lifting belt to decrease by k% of the speed vp(1 + n%) until it decreases to vt and then maintains this speed; In step S3, if vv < vh, the feeding machine system controller controls the speed of the feeding machine lifting belt to decrease to vd(1 + n%), and then every second set time, the feeding machine system controller controls the speed of the feeding machine lifting belt to increase by k% of the speed vd(1 + n%) until it increases to vt and then maintains this speed.

2. The method for controlling the speed of the lifting belt of a tobacco industry feeder according to claim 1, characterized in that, In step S1, the running speed vh of the electronic scale at the high level, the running speed vm of the electronic scale at the medium level, and the running speed vl of the electronic scale at the low level are all average speeds within the first set time.

3. The method for controlling the speed of the lifting belt of a tobacco industry feeder according to claim 1, characterized in that, The feeding machine system controller and the electronic scale controller are electrically connected, and both are PLC controllers.

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