CN111121930B - Automatic control system of constant feeder - Google Patents
Automatic control system of constant feeder Download PDFInfo
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- CN111121930B CN111121930B CN201911293669.3A CN201911293669A CN111121930B CN 111121930 B CN111121930 B CN 111121930B CN 201911293669 A CN201911293669 A CN 201911293669A CN 111121930 B CN111121930 B CN 111121930B
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- flow control
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
- G01G13/24—Weighing mechanism control arrangements for automatic feed or discharge
- G01G13/248—Continuous control of flow of material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
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- General Physics & Mathematics (AREA)
- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
Abstract
The invention relates to an automatic control system of a constant feeder, which comprises a flow control unit, a feedback unit, a driving unit and a metering unit, wherein the flow control unit comprises a comparator and a flow control regulator, the signal output end of the comparator is connected with the signal input end of the flow control regulator, the output end of the flow control unit is connected with the driving unit, the power output end of the driving unit is connected with the metering unit, the metering unit is provided with a load detection module and an inclination angle detection module, the load detection module, the inclination angle detection module and a feedback signal processor jointly form the feedback unit, the feedback unit is connected with the comparator of the flow control unit, and the comparator is also connected with a main controller; the flow feedback comprehensive load sensor and the inclination angle sensor provided by the invention are used for measuring two parameters, and the load parameters are corrected through the inclination angle parameters, so that the metering precision of the metering unit can be greatly improved through accurate feedback.
Description
Technical Field
The invention belongs to the technical field of constant feeder, and particularly relates to an automatic control system of a constant feeder.
Background
The rotor scale body consists of a disc, a rotor, a transmission mechanism, a fulcrum, a weighing sensor, a speed measuring sensor, a scale frame, a feeding port, a discharging port and the like. The pair of fulcrums are arranged on a parallel line which deviates a certain displacement of the central line of the disc, the weighing sensor is arranged on a vertical line of a connecting line of the two fulcrums, the speed measuring sensor is arranged at the tail end of a dragging motor shaft, the fulcrums are supported by the self-aligning bearings, the balancing device is adjusted when the material is not discharged, the disc is in a balanced state relative to the fulcrums, the rotor consists of a series of blades, the blades and the wall of the disc enclose a rotating space in a lattice, and when the material is discharged, the material enters the spaces from the feeding port and reaches the discharging port along with the rotation of the rotor to be discharged. At the moment, relative to the fulcrum, most of the materials are in the disc, and the small part of the materials are not in the disc, so that the balance of the materials in the disc relative to the fulcrum is lost, and the load cell is stressed, wherein the stress is in direct proportion to the weight of the materials in the disc.
According to the material distribution, the material weight in the disc is P (kilograms) which is P1+ P2+ … … + Pn (Pn is the material weight of each rotor grid), and the load cell is stressed by F (kilograms) which is F1+ F2+ … + Fn (Fn)
Force is applied to the sensor corresponding to Pn), then
F＝C1P…………………………………………(1)
(wherein C1 is a proportionality constant, and the magnitude of the proportionality constant is only related to the moment arms of Pn and Fn about the fulcrum) and the rotation speed signal of the rotor detected by the tachometer sensor is set as N (cycle/minute),
the flow rate Q (t/h) of the material is:
Q＝K1FN…………(2)
k1 is a proportionality constant
The formula (2) shows that the flow of the materials passing through the rotor scale depends on the product of the stress F of the weighing sensor and the rotating speed n of the speed measuring sensor, and therefore the cumulative amount W (ton) of the materials passing through the rotor scale in T (hour) can be obtained.
W ═ K1FNdt ═ K1 ═ FNdt … … … … … … … … … (3) (where dt is the time infinitesimal and T is the integration time).
The load is required to be detected by a weighing sensor in order to synthesize the real-time flow metering of the existing rotor scale, but the bottom surface of the disc is inclined due to unbalance of the center of the disc, so that the stress of the bearing sensor is a component force after the load is decomposed, the component force is actually smaller than the actual load, a measurement error is caused, an error of a feedback signal is further caused in a closed-loop control system, and the metering accuracy of the rotor scale is greatly influenced by the amplification of the closed-loop control system.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide an automatic control system for a constant-weight feeder, which improves the measurement accuracy of a rotor scale.
The invention realizes the purpose through the following technical scheme:
an automatic control system of a constant feeder comprises a flow control unit, a feedback unit, a driving unit and a metering unit, wherein the flow control unit comprises a comparator and a flow control regulator, the signal output end of the comparator is connected with the signal input end of the flow control regulator, the output end of the flow control unit is connected with the driving unit, the power output end of the driving unit is connected with the metering unit, the metering unit is provided with a load detection module and an inclination angle detection module, the load detection module, the inclination angle detection module and a feedback signal processor jointly form the feedback unit, the feedback unit is connected with the comparator of the flow control unit, and the comparator is further connected with a main controller; the given flow output by the main controller and the instant flow feedback output by the feedback unit are compared through the comparator, the compared difference value is input to the flow control regulator, the flow control regulator outputs a control signal to the driving unit, the driving unit adjusts the rotating speed to output power to the metering unit, and the flow control unit, the feedback unit, the driving unit and the metering unit form a full closed loop control system together.
As a further optimization scheme of the invention, the driving unit comprises a motor and a frequency converter, the motor is connected with a power supply through the frequency converter, and a signal output end of the frequency converter is connected with a signal output end of the flow control unit. The motor controls the rotating speed through the frequency converter.
As a further optimization scheme of the invention, the metering unit is a rotor scale, a scale body of the rotor scale is suspended on the frame through a weighing shaft, and the load sensor and the inclination angle sensor are both arranged at the bottom of the scale body of the rotor scale.
As a further optimized solution of the present invention, the load detection module includes a load sensor disposed at the bottom of the scale body.
As a further optimization scheme of the present invention, the tilt angle detection module may be a tilt angle sensor. The inclination angle of the bottom surface of the balance body relative to the horizontal plane can be measured.
As a further optimization scheme of the invention, the device also comprises a rotating speed control unit, the output end of the flow control unit is connected with the input end of the rotating speed control unit, the output end of the rotating speed control unit is connected with the input end of the driving unit, the rotating speed control unit comprises a comparator and a speed control driver, the signal output end of the comparator is connected with the signal input end of the speed control driver, the driving unit is connected with a rotating speed feedback unit, the signal output end of the rotating speed feedback unit is connected with the signal input end of the comparator, the power output end of the driving unit is connected with the given flow output by the main controller of the metering unit and the instant flow feedback output by the feedback unit, the compared difference value is input into a flow control regulator, the flow control regulator outputs a control signal to the rotating speed control unit, the rotating speed control unit outputs a control signal to the driving unit, the driving unit adjusts the rotating speed to output power to the metering unit, the driving unit feeds back the real-time rotating speed to a comparator of the rotating speed control unit, the comparator compares the given rotating speed input by the flow control unit with the real-time rotating speed, the difference value is input to the speed control driver, the rotating speed of the driving unit is adjusted, and the flow control unit, the feedback unit, the driving unit, the rotating speed control unit and the metering unit form a full closed loop control system together.
As a further optimization of the present invention, the driving unit is a motor.
As a further optimization scheme of the invention, the method is described.
The invention has the beneficial effects that:
1) the flow feedback comprehensive load sensor and the inclination angle sensor of the invention measure two parameters, correct the load parameters through the inclination angle parameters to obtain accurate actual load parameters, and send the actual load parameters to the flow control unit to be compared with the given flow for closed-loop control, and the accurate feedback can greatly improve the metering precision of the metering unit.
Drawings
FIG. 1 is a schematic structural diagram of the present invention in accordance with one embodiment;
FIG. 2 is a schematic diagram of the inclination, the measured load, and the actual load of the present invention according to one embodiment;
fig. 3 is a schematic structural diagram of the present invention in the second embodiment.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
Example one
As shown in fig. 1-2, an automatic control system of a constant feeder comprises a flow control unit, a feedback unit, a driving unit and a metering unit, wherein the flow control unit comprises a comparator and a flow control regulator, a signal output end of the comparator is connected with a signal input end of the flow control regulator, an output end of the flow control unit is connected with the driving unit, a power output end of the driving unit is connected with the metering unit, the metering unit is provided with a load detection module and an inclination angle detection module, the load detection module, the inclination angle detection module and a feedback signal processor jointly form the feedback unit, the feedback unit is connected with the comparator of the flow control unit, and the comparator is further connected with a main controller; the given flow output by the main controller and the instant flow feedback output by the feedback unit are compared through the comparator, the compared difference value is input to the flow control regulator, the flow control regulator outputs a control signal to the driving unit, the driving unit adjusts the rotating speed to output power to the metering unit, and the flow control unit, the feedback unit, the driving unit and the metering unit form a full closed loop control system together.
The driving unit comprises a motor and a frequency converter, the motor is connected with the power supply through the frequency converter, and the signal output end of the frequency converter is connected with the signal output end of the flow control unit. The motor controls the rotating speed through the frequency converter.
The measuring unit is an existing rotor scale, a scale body of the rotor scale is suspended on the rack through a weighing shaft, and the load sensor and the inclination angle sensor are arranged at the bottom of the scale body of the rotor scale.
The load detection module comprises a load sensor arranged at the bottom of the balance body.
As described above, the tilt angle detection module may be a tilt angle sensor. The inclination angle of the bottom surface of the balance body relative to the horizontal plane can be measured.
The automatic control principle of the invention is as follows:
and (4) normal control flow: the external main controller sends a given flow signal to the flow control unit, the flow control regulator sends a given rotating speed signal to the driving unit according to the given flow signal, and the driving unit outputs a certain rotating speed to the metering unit according to the given rotating speed signal.
A feedback process: in the working process of the metering unit, the load detection module and the inclination angle detection module respectively detect the measured load and the bottom inclination angle of the scale body of the metering unit, as shown in fig. 2, the measured load is measured as F, the bottom inclination angle is measured as beta, the feedback signal processor reduces the actual load according to the size of the bottom inclination angle beta and the measured load F, calculates the instant flow according to the load, feeds an instant flow signal back to the flow control unit, and the flow control unit compares the instant flow with the given flow and then sends the corrected given rotating speed signal to the driving unit again to realize closed-loop control.
Example two
As shown in fig. 3, on the basis of the first embodiment, an automatic control system of a constant feeder comprises a flow control unit, a feedback unit, a rotation speed control unit, a driving unit and a metering unit, wherein the flow control unit comprises a comparator and a flow control regulator, a signal output end of the comparator is connected with a signal input end of the flow control regulator, an output end of the flow control unit is connected with an input end of the rotation speed control unit, an output end of the rotation speed control unit is connected with a receiving end of the driving unit, the rotation speed control unit comprises a comparator and a speed control driver, a signal output end of the comparator is connected with a signal input end of the speed control driver, the driving unit is connected with the rotation speed feedback unit, a signal output end of the rotation speed feedback unit is connected with a signal input end of the comparator, a power output end of the driving unit is connected with the metering unit, and the metering unit is provided with a load detection module and an inclination detection module, the load detection module, the inclination angle detection module and the feedback signal processor jointly form a feedback unit, the feedback unit is connected with a comparator of the flow control unit, and the comparator is also connected with the main controller; the given flow output by the main controller and the instant flow output by the feedback unit are compared through a comparator, the compared difference is input into a flow control regulator, the flow control regulator outputs a control signal to a rotating speed control unit, the rotating speed control unit outputs a control signal to a driving unit, the driving unit adjusts rotating speed output power and a metering unit, the driving unit feeds back the real-time rotating speed to the comparator of the rotating speed control unit, the comparator compares the given rotating speed input by the flow control unit with the real-time rotating speed, the difference is input into a speed control driver, the rotating speed of the driving unit is adjusted, and the flow control unit, the feedback unit, the driving unit, the rotating speed control unit and the metering unit form a full closed loop control system together.
The driving unit is a motor.
The difference between the embodiment and the first embodiment is that a rotating speed feedback closed loop is added, specifically, the driving unit feeds back a real-time rotating speed signal to the rotating speed control unit, the rotating speed control unit compares the real-time rotating speed with a given rotating speed to obtain a difference value, and corrects the driving signal and then sends the difference value to the driving unit again, so that rotating speed closed loop control is realized, and rotating speed control precision is improved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (3)
1. The utility model provides a constant feeder automatic control system which characterized in that: the flow control unit comprises a comparator and a flow control regulator, the signal output end of the comparator is connected with the signal input end of the flow control regulator, the output end of the flow control unit is connected with the driving unit, the power output end of the driving unit is connected with the metering unit, the metering unit is provided with a load detection module and an inclination angle detection module, the load detection module, the inclination angle detection module and a feedback signal processor jointly form a feedback unit, the feedback unit is connected with the comparator of the flow control unit, and the comparator is further connected with a main controller; the given flow output by the main controller and the instant flow feedback output by the feedback unit are compared through a comparator, the compared difference is input into a flow control regulator, the flow control regulator outputs a control signal to a driving unit, the driving unit adjusts the rotating speed to output power to a metering unit, and the flow control unit, the feedback unit, the driving unit and the metering unit form a full closed loop control system;
the load detection module comprises a load sensor arranged at the bottom of the scale body;
the inclination angle detection module is an inclination angle sensor;
the metering unit is a rotor scale, a scale body of the rotor scale is suspended on the rack through a weighing shaft, and the load sensor and the inclination angle sensor are both arranged at the bottom of the scale body of the rotor scale;
the system also comprises a rotating speed control unit, the output end of the flow control unit is connected with the input end of the rotating speed control unit, the output end of the rotating speed control unit is connected with the input end of the driving unit, the rotating speed control unit comprises a comparator and a speed control driver, the signal output end of the comparator is connected with the signal input end of the speed control driver, the driving unit is connected with a rotating speed feedback unit, the signal output end of the rotating speed feedback unit is connected with the signal input end of the comparator, the power output end of the driving unit is connected with the given flow output by the main controller of the metering unit and the instant flow feedback output by the feedback unit, the compared difference value is input into the flow control regulator, the flow control regulator outputs a control signal to the rotating speed control unit, the rotating speed control unit outputs a control signal to the driving unit, the driving unit adjusts the rotating speed to output power to the metering unit, the driving unit feeds back the real-time rotating speed to a comparator of the rotating speed control unit, the comparator compares the given rotating speed input by the flow control unit with the real-time rotating speed, the difference value is input to the speed control driver, the rotating speed of the driving unit is adjusted, and the flow control unit, the feedback unit, the driving unit, the rotating speed control unit and the metering unit form a full closed loop control system together.
2. An automatic control system of a constant feeder according to claim 1, characterized in that: the driving unit comprises a motor and a frequency converter, the motor is connected with a power supply through the frequency converter, and the signal output end of the frequency converter is connected with the signal output end of the flow control unit.
3. An automatic control system of a constant feeder according to claim 1, characterized in that: the driving unit is a motor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911293669.3A CN111121930B (en) | 2019-12-16 | 2019-12-16 | Automatic control system of constant feeder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911293669.3A CN111121930B (en) | 2019-12-16 | 2019-12-16 | Automatic control system of constant feeder |
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| CN111121930A CN111121930A (en) | 2020-05-08 |
| CN111121930B true CN111121930B (en) | 2021-12-14 |
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| CN201911293669.3A Active CN111121930B (en) | 2019-12-16 | 2019-12-16 | Automatic control system of constant feeder |
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| CN117602381A (en) * | 2024-01-24 | 2024-02-27 | 济南市恒宇机械有限公司 | Dynamic pneumatic conveying balancing device for pulverized coal conveying |
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| JPS63283733A (en) * | 1987-05-14 | 1988-11-21 | Fuji Photo Film Co Ltd | Powder material metering and mixing apparatus |
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| CN202599492U (en) * | 2012-05-18 | 2012-12-12 | 北京燕山粉研精机有限公司 | Raw material measuring scale |
| CN106052815A (en) * | 2016-05-13 | 2016-10-26 | 合肥通用机械研究院 | Weighing system having high precision quantification process |
| CN206842582U (en) * | 2017-06-12 | 2018-01-05 | 合肥固泰自动化有限公司 | A kind of spoke rotor given quantity feeding device |
| CN107678274A (en) * | 2017-08-10 | 2018-02-09 | 深圳市海浦蒙特科技有限公司 | Frequency converter and its dosing control method for belt conveyer scale |
| CN108896145A (en) * | 2018-05-17 | 2018-11-27 | 燕山大学 | A kind of measurement control method of rotor weigher charging gear |
-
2019
- 2019-12-16 CN CN201911293669.3A patent/CN111121930B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63283733A (en) * | 1987-05-14 | 1988-11-21 | Fuji Photo Film Co Ltd | Powder material metering and mixing apparatus |
| CN101275866A (en) * | 2008-05-09 | 2008-10-01 | 沈阳天成自动化工程有限公司 | Automatic weighing type fluid state material metering instrument |
| CN202599492U (en) * | 2012-05-18 | 2012-12-12 | 北京燕山粉研精机有限公司 | Raw material measuring scale |
| CN106052815A (en) * | 2016-05-13 | 2016-10-26 | 合肥通用机械研究院 | Weighing system having high precision quantification process |
| CN206842582U (en) * | 2017-06-12 | 2018-01-05 | 合肥固泰自动化有限公司 | A kind of spoke rotor given quantity feeding device |
| CN107678274A (en) * | 2017-08-10 | 2018-02-09 | 深圳市海浦蒙特科技有限公司 | Frequency converter and its dosing control method for belt conveyer scale |
| CN108896145A (en) * | 2018-05-17 | 2018-11-27 | 燕山大学 | A kind of measurement control method of rotor weigher charging gear |
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