Feeding belt speed control method based on photoelectric sensor

Abstract

A feeding belt speed control method based on a photoelectric sensor is applied to material conveying equipment, the material conveying equipment comprises a control module and a conveying belt, the conveying belt is driven by a power unit, the photoelectric sensor is installed above the conveying belt, and the power unit and the photoelectric sensor are electrically connected with the control module; the method comprises the steps that the photoelectric sensor measures the current material passing time t1 and the interval time t2 between the current material and the next material; the control module obtains the gap distance between the current material and the next material according to the t1 and the t2; the control module calculates the target speed of the conveying belt based on the gap distance, and the control module drives the power unit according to the target speed so that the conveying belt can convey at the target speed. The problem of inaccurate metering caused by different manual feeding time intervals is effectively solved.

Description

Technical Field

[0001] The invention relates to the field of pulping and papermaking, and in particular to a feeding belt speed control method based on a photoelectric sensor. Background Art

[0002] In the material preparation and loading section of the pulp and papermaking field, raw materials are continuously placed on the loading belt. Due to manual loading and the influence of factors such as the shape, specifications and time interval of the raw materials, it is very difficult to accurately measure the loading amount. The accuracy of the loading amount is crucial for the subsequent measurement and control of the raw material concentration in the hydraulic washing and cooking areas. Summary of the invention

[0003] The purpose of the present invention is to provide a feeding belt speed control method based on a photoelectric sensor, aiming to solve the problem of inaccurate measurement caused by different time intervals of artificial feeding.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A method for controlling the speed of a feeding belt based on a photoelectric sensor, the method being applied to a feeding device, the feeding device comprising a control module and a conveying belt, the conveying belt being driven by a power unit, a photoelectric sensor being installed above the conveying belt, the power unit and the photoelectric sensor being electrically connected to the control module;

[0006] The method comprises:

[0007] The photoelectric sensor measures the current material passing time t 1 , and the interval time t between the current material and the next material 2 ;

[0008] The control module is based on the t 1 and t 2 Get the gap distance Gap between the current material and the next material;

[0009] The control module calculates the target speed of the conveyor belt based on the gap distance Gap according to the following formula

[0010]

[0011] Wherein, L, D, H are the length, width, and height of the material, respectively; ρ is the density of the material; i is the total impurity content in the material; M% is the humidity of the material; and w is the preset target output;

[0012] The control module drives the power unit at the target speed so that the conveyor belt is conveyed at the target speed.

[0013] Preferably, "the control module is based on the t1 and t 2 The steps of obtaining the gap distance Gap between the current material and the next material include:

[0014] Calculate the gap distance Gap between the current material and the next material as follows:

[0015]

[0016] The advantages of the present invention are:

[0017] The present invention installs a photoelectric sensor above the conveyor belt to detect the interval time of material feeding, fully combines the actual production needs, introduces the feeding interval factor variable and the preset target output into the belt speed control, effectively solves the problem of inaccurate measurement caused by different artificial feeding time intervals, ensures that the belt speed can be adjusted in real time with the subsequent output changes, and ensures the accuracy of the measurement accuracy of the feeding concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a structural schematic diagram of a material conveying device in an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of a pulse waveform measured by a photoelectric sensor in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0021] See attached Figure 1 , a feeding belt speed control method based on a photoelectric sensor provided in this embodiment is applied to a feeding equipment, the feeding equipment includes a control module 1 and a conveyor belt 2, the conveyor belt 2 is driven by a power unit 3, a photoelectric sensor 4 is installed above the conveyor belt 2, and the power unit 3 and the photoelectric sensor 4 are electrically connected to the control module 1. Specifically, the signal measured by the photoelectric sensor 4 can be transmitted to the control module 1, and the control module 1 calculates the speed of the conveyor belt 2 according to the signal, and adjusts the speed of the conveyor belt 2 by controlling the power unit 3. The control module 1 can be a DCS system, and the power unit 3 can be an electric motor. The attribute parameters of the material 5 are all known values, among which L, D, and H are the length, width, and height of the material, respectively, in meters, and ρ is the density of the material, in kg / m 3 , i is the total impurity content in the material, M% is the humidity of the material, and w is the preset target output in adt / d.

[0022] The feeding belt speed control method is intended to introduce the target output w adt / d and the feeding gap Gap into the belt speed control calculation.

[0023] In the process design balance calculation, it is assumed that the material is continuously fed according to the ideal state, so the feeding gap Gap=0, and the rated output Nadt / d is reached, so it can be obtained:

[0024]

[0025] The weight of each package is:

[0026]

[0027] The output calculated based on raw material packages is:

[0028]

[0029] Therefore, under the rated output N, when Gap = 0, the speed of the material passing through the belt is V = N 2 *L m / min.

[0030] The speed regulation of the feeding belt is linear, then V is as follows:

[0031]

[0032] When the material passes through the photoelectric switch, the DCS control system can obtain Figure 2 The pulse waveform is shown.

[0033] That is, the photoelectric sensor measures the current material passing time t 1 , and the interval time t between the current material and the next material 2 ;

[0034] The control module is based on t 1 and t 2 Get the gap distance Gap between the current material and the next material:

[0035]

[0036] Among them, t 1 ,t 2 The unit of is seconds and the unit of Gap is meters.

[0037] Therefore, when Gap is not 0, the target speed of the conveyor belt is:

[0038]

[0039] The control module drives the power unit at a target speed so that the conveyor belt is conveyed at the target speed.

[0040] In this way, after the next material passes through, the next material is used as the current material, and the next material is used as the next material to repeat the above operation, and this cycle is used to realize real-time control of the feeding belt speed.

[0041] The above are preferred embodiments of the present invention and the technical principles used therein. For those skilled in the art, any obvious changes such as equivalent transformations, simple replacements, etc. based on the technical solution of the present invention, without departing from the spirit and scope of the present invention, are within the scope of protection of the present invention.

Claims

1. A feeding belt speed control method based on photoelectric sensor, characterized in that: The method is applied to a feeding device, the feeding device comprises a control module and a conveying belt, the conveying belt is driven by a power unit, a photoelectric sensor is installed above the conveying belt, and the power unit and the photoelectric sensor are electrically connected to the control module; The method comprises: The photoelectric sensor measures the passing time t1 of the current material and the interval time t2 between the current material and the next material; The control module obtains the gap distance Gap between the current material and the next material based on t1 and t2; The control module calculates the target speed of the conveyor belt based on the gap distance Gap according to the following formula Wherein, L, D, H are the length, width, and height of the material, respectively; ρ is the density of the material; i is the total impurity content in the material; M% is the humidity of the material; and w is the preset target output; The control module drives the power unit at the target speed so that the conveyor belt is conveyed at the target speed.

2. The method for controlling the speed of a feeding belt based on a photoelectric sensor according to claim 1, characterized in that: The step of "the control module obtaining the gap distance Gap between the current material and the next material based on t1 and t2" includes: Calculate the gap distance Gap between the current material and the next material as follows:

Images