CN111538281A - A device for automatically controlling the amount of material through current monitoring - Google Patents

Abstract

The invention discloses a device for automatically controlling material amount through current monitoring, which comprises a circuit for automatically controlling the material amount, wherein the circuit for automatically controlling the material amount comprises the following components: the sampling module is used for being connected with the granulating motor to obtain a current analog signal of the granulating motor; the control module is connected with the sampling module and used for calculating the real-time current of the granulating motor according to the current analog signal; the conversion module is connected with the control module and converts the digital signal of the real-time current into a voltage analog signal; the frequency converter is connected with the conversion module, adjusts the output power according to the voltage analog signal and is used for controlling the working state of the feeding motor; this application is adjusted through forming a closed loop with feeding motor and pelletization motor, can guarantee that the pelletization motor is always in the full loaded operating condition of safety, can improve the efficiency of pelletization motor work and guarantee that it nevertheless appears transshipping and lead to damaging.

Description

A device for automatically controlling the amount of material through current monitoring

technical field

The invention relates to the field of automatic control of biomass pellet machines, in particular to a device for automatically controlling the amount of materials through current monitoring.

Background technique

Material fuel is the use of corn stalks, wheat straw, straw, peanut husks, corn cob, cotton stalks, soybean stalks, chaff, weeds, branches, leaves, sawdust, bark and other solid wastes of crops as raw materials. Pressed, densified and formed into small rod-shaped solid particle fuel. Pellet fuel is made by extruding raw materials such as sawdust and straw under normal temperature conditions by using pressure rollers and ring die. The ash content is less than 1.5%~2.0%, the dry basis moisture content is less than 10%~15%, the ash content is less than 1.5%, the sulfur content and chlorine content are less than 0.07%, and the nitrogen content is less than 0.5%. The density of the raw material is about 110-130kg/m3, and the density of the formed particles is 1100kg/m3, which is very convenient for transportation and storage. At the same time, its combustion performance is greatly improved.

Biomass pellet fuel is a renewable energy gifted by nature to us. It is a response to the central call to create a conservation-minded society. Biomass pellets, as a new type of pellet fuel, have won wide recognition for its unique advantages; compared with traditional fuels, it not only has economic advantages but also has environmental benefits, which fully meets the requirements of sustainable development. First of all, due to the shape of particles, the volume is compressed, the storage space is saved, and the transportation is also convenient, which reduces the transportation cost. Secondly, the combustion efficiency is high, it is easy to burn out, and the residual carbon content is small. Compared with coal, it has high volatile content and low ignition point, which is easy to ignite; the density is increased, the energy density is large, and the combustion duration is greatly increased, which can be directly applied to coal-fired boilers. In addition, when biomass pellets are burned, the content of harmful gas components is extremely low, and the emission of harmful gases is small, which has environmental protection benefits. And the ash after burning can also be used directly as potash fertilizer, which saves money.

The traditional biomass granulator uses a contactor to control the motor feeding, and uses manual control of the feeding amount of the material valve, because the actual feeding amount is still manually controlled. Manual control of too little feeding leads to low production efficiency and waste of electricity. The particles are relatively loose and there are many powders; too much feed will cause the granulating motor to overload, block the rotor, burn out the motor, and damage the equipment. Therefore, there is a need for a device that automatically controls the amount of material through current monitoring, which can control the granulation motor to work at full load without overloading due to too much feeding, which can improve production efficiency and ensure its stability.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art, and to provide a device for automatically controlling the amount of material through current monitoring, which can effectively avoid the event of a ship hitting a buoy.

The present invention is achieved through the following technical solutions:

A device for automatically controlling the amount of materials through current monitoring, comprising a circuit for automatically controlling the amount of materials, and the circuit for automatically controlling the amount of materials includes:

A sampling module used to connect with the granulating motor and obtain the current analog signal of the granulating motor;

A control module that is connected with the sampling module and calculates the real-time current of the granulating motor according to the current analog signal;

A conversion module that is connected to the control module and converts the digital signal of the real-time current into a voltage analog signal; and

A frequency converter that is connected to the conversion module, adjusts the output power according to the voltage analog signal and is used to control the working state of the feeding motor.

In one of the embodiments, the circuit for automatically controlling the amount of material further comprises: a display module for connecting with the control module and displaying the current value according to the real-time current digital signal.

In one of the embodiments, the circuit for automatically controlling the amount of material further comprises: an input module for connecting with the control module and for inputting preset parameter values to the control module according to a key signal.

In one of the embodiments, the circuit for automatically controlling the amount of material further includes: an overload protection module connected to the control module for acquiring an overload signal of the feeding motor.

In one of the embodiments, the circuit for automatically controlling the amount of material further comprises: for connecting with the control module, when the control module determines that the real-time current is not less than a preset value and/or when the control module obtains the input The alarm module that alarms the overload signal of the feed motor.

In one of the embodiments, the sampling module includes: a current transformer and a filtering unit; the primary side of the current transformer is used to connect with the granulation motor, and the secondary side of the current transformer is connected to the The input end is connected, and the output end of the filtering unit is connected with the control module.

In one of the embodiments, the filtering unit includes: a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor and a first diode; the first end of the first capacitor and The second end is respectively connected with the two ends of the secondary side of the current transformer; the first end and the second end of the first resistor are respectively connected with the first end and the second end of the first capacitor; The first end of the second resistor is connected to the first end of the first resistor through a first diode, the second end of the second resistor is connected to the second end of the first resistor; the first end of the second capacitor and the second end are respectively connected to the first end and the second end of the second resistor; the first end of the two capacitors is connected to the control module through the third resistor; the second end of the first capacitor, the second end of the second capacitor The second end, the second end of the first resistor, and the second end of the second resistor are all grounded.

In one of the embodiments, the primary side of the current transformer is connected to the pelletizing motor through a fourth resistor R13.

In one of the embodiments, the control module includes a single-chip microcomputer chip.

In one of the embodiments, the single-chip microcomputer chip is a chip of the model U1-PIC18F458.

The beneficial effects of the device for automatically controlling the amount of material by current monitoring relative to the prior art are as follows:

The present invention obtains the current analog signal of the granulating motor through the sampling module, and then transmits the current analog signal to the control module, and the control module calculates the real-time current of the granulating motor according to the preset algorithm, and the real-time current is in the digital form in the control module. Then the control module transmits the real-time current of the digital signal to the conversion module, and the conversion module converts the real-time current into an analog voltage signal, and then the conversion signal transmits the analog voltage signal to the inverter. After the inverter receives the voltage signal According to the preset rules, the corresponding power is output to the feeding motor, so as to control the output power of the feeding motor and realize the control of the feeding motor; because the feeding material when the feeding motor is working belongs to the load of the granulating motor. , so the amount of material fed by the feeding motor will directly affect the amount of debt dragged by the granulating motor, and will change the current of the granulating motor, so the entire workflow forms a closed loop, and the simplified workflow is: The real-time power of the feeding motor affects the working current of the granulating motor, and the working current of the granulating motor is fed back to the feeding motor to adjust the power of the feeding motor, thus forming a closed-loop adjustment to ensure that the granulating motor is always at a safe full load The working state of the granulator will not cause the granulating motor to run at low power due to insufficient feeding of the feeding motor, resulting in poor quality of the manufactured material and reducing the granulation efficiency; Excessive feeding of the feeding motor causes its overload operation, resulting in damage to the granulating motor.

Description of drawings

Fig. 1 is the module schematic diagram of the first embodiment of the present invention for automatically controlling the amount of material through current monitoring;

Fig. 2 is the module schematic diagram of the second embodiment of the present invention for automatically controlling the amount of material through current monitoring;

Fig. 3 is the circuit schematic diagram of the acquisition module;

Fig. 4 is the circuit schematic diagram of the control module;

Fig. 5 is the circuit schematic diagram of the conversion module;

FIG. 6 is a circuit schematic diagram of the display module.

specific embodiment

In order to make the objectives, technical solutions and advantages of the present invention clearer, the specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Please refer to Fig. 1, Fig. 3, Fig. 4 and Fig. 5, an embodiment of a device for automatically controlling the amount of material through current monitoring includes a circuit for automatically controlling the amount of material, and the circuit for automatically controlling the amount of material includes: a sampling module, Control modules, conversion modules and frequency converters;

Among them, the sampling module is used to connect with the granulation motor to obtain the current analog signal of the granulation motor;

The control module is connected with the sampling module, and the real-time current of the granulating motor is calculated according to the current analog signal;

The conversion module is connected with the control module, and converts the digital signal of the real-time current into a voltage analog signal;

The frequency converter is connected with the conversion module, adjusts the output power according to the voltage analog signal and is used to control the working state of the feeding motor;

Working principle: The sampling module obtains the current analog signal of the granulating motor, and then transmits the current analog signal to the control module. The control module calculates the real-time current of the granulating motor according to the preset algorithm, and the real-time current is controlled in digital form. Save or call it in the module, then the control module transmits the real-time current of the digital signal to the conversion module, the conversion module converts the real-time current into an analog voltage signal, and then the conversion signal transmits the analog voltage signal to the inverter, and the inverter receives the voltage signal Then, according to the preset rules, the corresponding power is output to the feeding motor, so as to control the output power of the feeding motor and realize the control of the feeding motor; because the feeding material when the feeding motor is working belongs to the load brought by the granulating motor. Therefore, the amount of feeding of the feeding motor will directly affect the amount of debt dragged by the granulating motor, and it will change the current of the granulating motor. Therefore, the entire work process forms a closed loop, and the simplified work flow is : The real-time power of the feeding motor affects the working current of the granulating motor, and the working current of the granulating motor is fed back to the feeding motor to adjust the power of the feeding motor, thus forming a closed-loop adjustment to ensure that the granulating motor is always safe In the working state of full load, there will be no low-power operation of the granulating motor due to insufficient feeding of the feeding motor, resulting in poor quality of the manufactured material and reducing the efficiency of granulation; there will also be no granulation motor because of Excessive feeding of the feeding motor causes it to overload, resulting in damage to the granulating motor.

Please refer to FIG. 2 and FIG. 6. In one embodiment, the circuit for automatically controlling the amount of material further includes: a display module for connecting with the control module and displaying the current value according to the digital signal of the real-time current, and the display module can display the current value in real time. The current value of the current granulating motor can be obtained, which can provide intuitive working status data for monitoring or inspection personnel.

Referring to FIG. 2, in one embodiment, the circuit for automatically controlling the amount of material further includes: an input module for connecting with the control module and for inputting preset parameter values to the control module according to the key signal, and the input module is a key The input module can adjust the preset parameter value of the control module through the input module.

Referring to FIG. 2 , in one embodiment, the circuit for automatically controlling the amount of material further includes: an overload protection module connected to the control module and used to obtain an overload signal of the feeding motor, and the overload protection module can obtain the feeding motor In the event of overload, after the overload protection module obtains the overload signal, it transmits the overload signal to the control module, and then the control module can send a signal to control the granulating motor and the feeding motor to stop working, which can avoid equipment damage.

Referring to FIG. 2, in one of the embodiments, the circuit for automatically controlling the amount of material further includes: for connecting with the control module, when the control module determines that the real-time current is not less than a preset value and/or when the control module obtains the feed The overload signal of the motor will alarm the alarm module. When the control module judges that the granulating motor is overloaded according to the preset rules and the real-time current of the granulating motor, or/and when the control module obtains that the feeding motor from the overload protection module is in If there is an overloaded signal, the control module sends a signal to the alarm module, and the alarm module sends out an alarm after receiving the signal, which can remind the staff to deal with it.

Please refer to FIG. 2 and FIG. 3 , in one embodiment, the sampling module includes: a current transformer T3 and a filtering unit; the primary side of the current transformer T3 is used to connect with the granulating motor, and the secondary side of the current transformer T3 The side is connected to the input end of the filter unit, and the output end of the filter unit is connected to the control module; the primary side of the current transformer T3 collects the working current of the granulating motor, and converts the working current into a corresponding small current according to its own transformation ratio, Then, the small current is input to the control module after passing through the filtering unit, so that the current can be processed in advance, the one-time information amount of the control module can be reduced, and the efficiency can be improved.

Referring to FIG. 3, in one embodiment, the filter unit includes: a first capacitor C5, a second capacitor C8, a first resistor R20, a second resistor R23, a third resistor R16 and a first diode; a first The first end and the second end of the capacitor C5 are respectively connected with the two ends of the secondary side of the current transformer T3; the first end and the second end of the first resistor R20 are respectively connected with the first end and the second end of the first capacitor C5. The two ends are connected correspondingly; the first end of the second resistor R23 is connected to the first end of the first resistor R20 through the first diode, and the second end of the second resistor R23 is connected to the second end of the first resistor R20; The first end and the second end of the second capacitor C8 are respectively connected to the first end and the second end of the second resistor R23; the first end of the second capacitor is connected to the control module through the third resistor R16; the second end of the first capacitor C5 terminal, the second terminal of the second capacitor C8, the second terminal of the first resistor R20 and the second terminal of the second resistor R23 are all grounded; filter to improve the quality of the current.

In one of the embodiments, the primary side of the current transformer T3 is connected to the granulation motor through a fourth resistor, and the fourth resistor can play a role in reducing the current, so as to control the primary side current of the current transformer T3 to be within its allowable current within the value.

In one of the embodiments, the control module includes a single-chip microcomputer chip.

In one of the embodiments, the single-chip microcomputer chip is a chip of type U1-PIC18F458.

The present invention is not limited to the above-mentioned implementation method, if various changes or deformations of the present invention do not depart from the spirit and scope of the present invention, if these changes and deformations belong to the claims of the present invention and the equivalent technical scope, then the present invention It is also intended to include such modifications and variations.

Claims (10)

1. The utility model provides a device of automatic control material volume through current monitoring, includes the circuit of automatic control material volume, its characterized in that, the circuit of automatic control material volume includes:

the sampling module is used for being connected with the granulating motor to obtain a current analog signal of the granulating motor;

the control module is connected with the sampling module and used for calculating the real-time current of the granulating motor according to the current analog signal;

the conversion module is connected with the control module and converts the digital signal of the real-time current into a voltage analog signal; and

and the frequency converter is connected with the conversion module, adjusts the output power according to the voltage analog signal and is used for controlling the working state of the feeding motor.

2. The apparatus for automatically controlling a content through current monitoring according to claim 1, wherein the circuit for automatically controlling a content further comprises: and the display module is used for being connected with the control module and displaying the current value according to the digital signal of the real-time current.

3. The apparatus for automatically controlling a content through current monitoring according to claim 1, wherein the circuit for automatically controlling a content further comprises: and the input module is used for being connected with the control module and inputting preset parameter values to the control module according to the key signals.

4. The apparatus for automatically controlling a content through current monitoring according to claim 1, wherein the circuit for automatically controlling a content further comprises: and the overload protection module is connected with the control module and used for acquiring an overload signal of the feeding motor.

5. The apparatus for automatically controlling a content through current monitoring according to claim 4, wherein the circuit for automatically controlling a content further comprises: and the alarm module is used for being connected with the control module and giving an alarm when the control module judges that the real-time current is not less than a preset value and/or when the control module acquires an overload signal of the feeding motor.

6. The apparatus for automatically controlling the amount of material through current monitoring according to any one of claims 1 to 5, wherein the sampling module comprises: the current transformer and the filtering unit; the primary side of the current transformer is used for being connected with the granulating motor, the secondary side of the current transformer is connected with the input end of the filtering unit, and the output end of the filtering unit is connected with the control module.

7. The apparatus for automatically controlling the contents of materials through current monitoring according to claim 6, wherein the filtering unit comprises: the circuit comprises a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor and a first diode; the first end and the second end of the first capacitor are respectively and correspondingly connected with two ends of the secondary side of the current transformer; the first end and the second end of the first resistor are correspondingly connected with the first end and the second end of the first capacitor respectively; the first end of the second resistor is connected with the first end of the first resistor through a first diode, and the second end of the second resistor is connected with the second end of the first resistor; the first end and the second end of the second capacitor are respectively connected with the first end and the second end of the second resistor; the first ends of the two capacitors are connected with the control module through a third resistor; and the second end of the first capacitor, the second end of the second capacitor, the second end of the first resistor and the second end of the second resistor are all grounded.

8. The apparatus for automatically controlling the contents of a material through current monitoring according to claim 6, wherein the primary side of the current transformer is connected to the pellet motor through a fourth resistor R13.

9. The device for automatically controlling the amount of material through current monitoring according to any one of claims 1-5, 7 and 8, wherein the control module comprises a single chip.

10. The device for automatically controlling material content through current monitoring according to claim 6, wherein the single chip microcomputer chip is a chip of a model U1-PIC18F 458.

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