CN114955392B

CN114955392B - Scraper machine weighing system and method

Info

Publication number: CN114955392B
Application number: CN202210762227.4A
Authority: CN
Inventors: 赵承志; 左子昂
Original assignee: Yangtze University
Current assignee: Yangtze University
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2024-01-26
Anticipated expiration: 2042-06-30
Also published as: CN114955392A

Abstract

The invention relates to a scraper weighing system and a method, wherein the scraper weighing system comprises the following components: the automatic scraping device comprises a turning plate, a scraping plate, an angle sensor and a controller, wherein the turning plate is arranged in the scraping plate, when the weight of the scraping plate changes, the moving direction angle between the scraping plate and the turning plate changes, the lower end of the angle sensor is connected with the turning plate, the angle sensor is used for measuring the moving direction included angle between the turning plate and the scraping plate, a measuring current signal is output, and the controller is used for outputting weight parameters according to the measuring current signal. The scraper conveying weighing device solves the problems of unclear conveying speed and total conveying amount in the conveying process, and the instantaneous material quantity is measured through the change of the angle in the conveying process and the output current of the angular displacement sensor. And obtaining the accumulated material weight from the instantaneous material quantity.

Description

Scraper machine weighing system and method

Technical Field

The invention relates to the technical field of scraper machines, in particular to a scraper machine weighing system and method.

Background

The scraper is to continuously convey bulk materials in a closed rectangular section by means of a moving scraper chain. When the horizontal conveying is carried out, the materials are subjected to the pressure of the scraper chain in the moving direction and the action of the weight of the materials, so that internal friction force is generated between the materials, the stable state of the material layers is ensured by the friction force, and the external friction resistance generated by the movement of the materials in the machine groove is overcome, so that the materials form an integral material flow to be conveyed.

In the prior art, in the material transportation process, the transmission speed and the total weight of the transmission materials are often unclear, so that uncertainty is brought to the whole material transmission, and the expected effect is difficult to achieve. Therefore, how to perform accurate weight measurement during the feeding process of the scraper is a problem to be solved.

Disclosure of Invention

In view of the foregoing, it is necessary to provide a scraper weighing system and method for solving the problem that the total conveying amount is difficult to be grasped in the conveying process of the scraper in the prior art.

In order to solve the technical problem, the invention provides a scraper machine weighing system, comprising: the automatic scraping device comprises a turning plate, a scraping plate, an angle sensor and a controller, wherein the turning plate is arranged in the scraping plate, when the weight of the scraping plate changes, the moving direction angle between the scraping plate and the turning plate changes, the lower end of the angle sensor is connected with the turning plate, the angle sensor is used for measuring the moving direction included angle between the turning plate and the scraping plate, a measuring current signal is output, and the controller is used for outputting weight parameters according to the measuring current signal.

Further, a gear is arranged in the scraper, and when the gear passes through a grid, a pulse signal is output to the controller in a sensing mode.

Further, the controller comprises a power supply circuit, an induction circuit, a pulse processing circuit, a display circuit and a main control chip, wherein the power supply circuit, the pulse processing circuit, the display circuit and the induction circuit are respectively and electrically connected to the main control chip.

Further, the power supply circuit comprises a voltage stabilizing chip, a first capacitor and a second capacitor, wherein a first port of the voltage stabilizing chip is electrically connected to the first power supply signal and the first capacitor, a third port of the voltage stabilizing chip is electrically connected to the second power supply signal and the second capacitor, and a second port of the voltage stabilizing chip is grounded.

Further, the sensing circuit comprises a rotational speed sensing input device and an angular displacement circuit, wherein:

the first port of the rotating speed induction input device is electrically connected to the main control chip, the second port of the rotating speed induction input device is grounded, and the rotating speed induction input device outputs pulse signals to the main control chip every time the rotating speed induction input device senses a magnet;

the angular displacement circuit comprises an induction chip, a third capacitor and a fourth resistor, wherein the induction chip is electrically connected to the angle sensor through a filter circuit formed by the third capacitor and the fourth resistor, the induction chip is electrically connected to the main control chip, and the main control chip acquires a measuring current signal output by the angle sensor once every time the main control chip receives the pulse signal and inputs the measuring current signal to the main control chip.

Further, the pulse processing circuit comprises a plurality of resistors and a photoelectric module, wherein one end of the photoelectric module is respectively and electrically connected to the voltage signal and the plurality of resistors, and the other end of the photoelectric module is respectively and electrically connected to the plurality of resistors, the main control chip and the power supply signal, wherein when materials passing through the scraper reaches a preset weight, a corresponding pulse signal is output, and the numerical value change of the display circuit is controlled.

Further, the display circuit comprises a display chip, an interface circuit and a brightness adjusting resistor, wherein the display chip and the interface circuit are respectively and electrically connected to the main control chip, and the display chip is electrically connected with the brightness adjusting resistor.

Further, the controller also comprises a reset circuit, wherein the reset circuit is used for resetting the accumulated material weight when the scraper weighing system is started.

Further, the controller also comprises a display screen operation switch circuit, the display screen operation switch circuit comprises a first switch and a second switch, when the first switch is closed, the scraper is unloaded, peeling treatment is carried out, when the second switch is closed, a target amount of material is put in, and the current and the mass relation of the material are calibrated.

The invention also provides a scraper weighing method, which is based on the scraper weighing system, and comprises the following steps:

acquiring a measurement current signal of an angle sensor, the lifting height of the scraper in an idle state and the scraper length of the scraper;

determining a first height of the material when the scraper machine passes through according to the measured current signal, the elevation height and the scraper length;

determining a first ratio according to the first height and the elevation height;

and determining weight parameters of the materials according to the first height, the first proportion and the scraper length.

Compared with the prior art, the invention has the beneficial effects that:

in the system, the lower end of the angle sensor is connected with the turning plate, the angle between the turning plate and the scraper is effectively measured, when the bearing weight of the scraper is changed, the measured current signal output by the angle sensor is also changed, and the controller can process the measured current signal through various circuits in the module, so that corresponding data operation is carried out, and weight parameters are obtained.

In the method, firstly, a current signal is measured, the lifting height of the scraper in an idle state and the scraper length of the scraper are effectively obtained; then, determining a first height of the material passing through the scraper machine based on combining the plurality of parameters; then, comparing the first height of the material passing through the scraper with the lifting height of the scraper when the scraper is empty, and determining a corresponding first proportion; and finally, correspondingly calculating the weight of the material by combining the first proportion, the length of the scraping plate and the first height.

In conclusion, the scraper conveyor material conveying weighing device solves the problems that the conveying speed and the total conveying amount are unclear in the conveying process, the output current of the angular displacement sensor is caused by the angle change in the conveying process, and the instantaneous material quantity is measured by the current change. And obtaining the accumulated material weight from the instantaneous material quantity.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a scraper weighing system according to the present invention;

FIG. 2 is a schematic diagram of an embodiment of a controller in a scraper weighing system according to the present invention;

FIG. 3 is a schematic diagram of an embodiment of a power circuit according to the present invention;

FIG. 4 is a schematic diagram illustrating an embodiment of a rotational speed sensing input device according to the present invention;

FIG. 5 is a schematic diagram of an embodiment of an angular displacement circuit according to the present invention;

FIG. 6 is a schematic diagram of an embodiment of a pulse processing circuit according to the present invention;

FIG. 7 is a schematic diagram of a display circuit according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a reset circuit according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of an embodiment of a display operation switch circuit according to the present invention;

FIG. 10 is a schematic diagram of an embodiment of an oscillating circuit according to the present invention;

FIG. 11 is a schematic flow chart of an embodiment of a weighing method of a scraper according to the present invention;

FIG. 12 is a schematic diagram of an embodiment of the mass and current relationship provided by the present invention;

FIG. 13 is a schematic diagram of an embodiment of an output current image of an angle sensor according to the present invention;

FIG. 14 is a diagram illustrating an exemplary embodiment of a start-up screen of a scraper weighing device according to the present invention;

FIG. 15 is a diagram illustrating an embodiment of a parameter setting screen according to the present invention;

fig. 16 is a schematic structural diagram of an embodiment of a wiring structure provided by the present invention.

Detailed Description

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.

In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. Furthermore, the meaning of "a plurality of" means at least two, such as two, three, etc., unless specifically defined otherwise.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the described embodiments may be combined with other embodiments.

The invention provides a scraper weighing system and a scraper weighing method, which effectively judge the real-time weight of a scraper in the material transmission process by measuring the change current caused by the change angle between the scraper and a turning plate, and provide a new thought for further improving the convenience and the high efficiency of the scraper in transportation.

Before the description of the embodiments, the related words are interpreted:

scraper machine: is a transportation machine used for a coal mine mining working face. The method is mainly used for conveying the coal face and gateroad, and can also be used for a coal roadway and a half-coal roadway driving face. It can be transported upwards, or downwards, typically not exceeding 35 degrees. The downward transport is generally no more than 25 degrees, preferably no more than 20 degrees. The scraper has the advantages that the transportation capability is not affected by the size and humidity of the cargo carrier, the height of the scraper body is convenient to load, the length of the scraper body is convenient to adjust, the scraper body is firm and can be used in the waterfall broken loading, the working face of the medium and the like, so that the scraper is widely used in multi-town coal mines. But it has the disadvantages: the working resistance is high, the power consumption is high, the chute is seriously worn, the chain is easy to break when the maintenance and the use are improper, and the transportation distance is limited to a certain extent.

Based on the description of the technical terms, in the prior art, the weight change of the material is difficult to grasp in real time in the process of transporting the material by the scraper. The present invention thus aims to propose a system for weighing a scraper with high reliability and a method thereof.

Specific embodiments are described in detail below:

an embodiment of the present invention provides a scraper weighing system, and referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the scraper weighing system provided by the present invention, including: the automatic scraping device comprises a turning plate, a scraping plate, an angle sensor and a controller, wherein the turning plate is arranged in the scraping plate, when the weight of the scraping plate changes, the moving direction angle between the scraping plate and the turning plate changes, the lower end of the angle sensor is connected with the turning plate, the angle sensor is used for measuring the moving direction included angle between the turning plate and the scraping plate, a measuring current signal is output, and the controller is used for outputting weight parameters according to the measuring current signal.

In the embodiment of the invention, the lower end of the angle sensor is connected with the turning plate, so that the angle between the turning plate and the scraper is effectively measured, when the bearing weight of the scraper is changed, the measured current signal output by the angle sensor is also changed, and the controller can process the measured current signal through various circuits in the module, so that corresponding data operation is carried out, and the weight parameter is obtained.

As a preferred embodiment, the scraper is internally provided with a gear, and when the gear passes through a grid, a pulse signal is output to the controller in a sensing way.

In the embodiment of the invention, the pulse signals are sent to the controller through the sensing gear to trigger corresponding signal acquisition.

As a preferred embodiment, referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a controller in a weighing system of a scraper machine according to the present invention, where the controller includes a power circuit, an induction circuit, a pulse processing circuit, a display circuit and a main control chip, and the power circuit, the pulse processing circuit, the display circuit and the induction circuit are respectively electrically connected to the main control chip.

In the embodiment of the invention, an effective controller is constructed by setting the connection relation of a power supply circuit, an induction circuit, a pulse processing circuit, a display circuit and a main control chip.

As a preferred embodiment, referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of a power circuit provided by the present invention, where the power circuit includes a voltage stabilizing chip, a first capacitor and a second capacitor, a first port of the voltage stabilizing chip is electrically connected to a first power signal and the first capacitor, a third port of the voltage stabilizing chip is electrically connected to a second power signal and the second capacitor, and a second port of the voltage stabilizing chip is grounded.

In the embodiment of the invention, the type of the voltage stabilizing chip is preferably HT7335, and 5V voltage is provided for the singlechip and each module.

As a preferred embodiment, as shown in fig. 4 and fig. 5, fig. 4 is a schematic structural diagram of an embodiment of a rotational speed sensing input device provided by the present invention, and fig. 5 is a schematic structural diagram of an embodiment of an angular displacement circuit provided by the present invention, where the sensing circuit includes a rotational speed sensing input device and an angular displacement circuit, and the following steps are as follows:

In the embodiment of the invention, in the rotation process of the scraper, p1 in fig. 4 outputs a pulse to INT0 interruption of the singlechip every time when sensing a magnet, R4 and C3 are connected in parallel, and the scraper has a filtering effect and a smoothing effect of an output signal. In the angle sensor, along with the angle conversion of the turning plate, a current which is changed all the time is input to an analog input channel 0 (CH 0) of the ADC0832, and the ADC0832 changes the analog signal into a digital signal to be input into an INT1 of the singlechip. And collecting the current output by the angle sensor once when an INT0 interrupt is received, and obtaining the current instantaneous material quantity according to the relation between the current and the quality. The angle sensor outputs 4-20mA of current, the current is converted into 1-5V of voltage through the ADC0832 and is input into the singlechip, the singlechip calculates the material quantity corresponding to the current, and then the material quantity is output to the display module, and the instantaneous material quantity is displayed.

As a preferred embodiment, as seen in fig. 6, fig. 6 is a schematic structural diagram of an embodiment of a pulse processing circuit provided by the present invention, where the pulse processing circuit includes a plurality of resistors and a photoelectric module, one end of the photoelectric module is electrically connected to a voltage signal and a plurality of resistors, and the other end of the photoelectric module is electrically connected to a plurality of resistors, the main control chip and a power signal, respectively, where when a material passing through the scraper reaches a preset weight, a corresponding pulse signal is output to control a numerical change of the display circuit.

In the embodiment of the invention, in the pulse processing circuit, every 1t of material passes through the scraper, one pulse is output, and the accumulated material weight is added by 1t on the display screen.

As a preferred embodiment, referring to fig. 7, fig. 7 is a schematic structural diagram of an embodiment of a display circuit provided by the present invention, where the display circuit includes a display chip, an interface circuit and a brightness adjusting resistor, the display chip and the interface circuit are respectively electrically connected to the main control chip, and the display chip is electrically connected to the brightness adjusting resistor.

In the embodiment of the invention, the LCD1602 can work normally after 8 data lines and 3 control lines E, RS and R/W are connected with the SCM. Contrast adjustment can be achieved by connecting a 10k omega potentiometer. LCD1602 is a display that displays the current instantaneous and cumulative materials. The slide rheostat RV1 controls the display brightness.

As a preferred embodiment, as seen in connection with fig. 8, fig. 8 is a schematic structural diagram of an embodiment of a reset circuit provided by the present invention, where the controller further includes a reset circuit, and the reset circuit is configured to clear the accumulated material weight when the scraper weighing system is started.

In the embodiment of the invention, the accumulated materials are cleared every time the machine is started.

As a preferred embodiment, referring to fig. 9, fig. 9 is a schematic structural diagram of an embodiment of a display screen operation switch circuit provided by the present invention, where the controller further includes a display screen operation switch circuit, the display screen operation switch circuit includes a first switch and a second switch, when the first switch is closed, the scraper is unloaded, peeling is performed, and when the second switch is closed, a target amount of material is placed, and the current and mass relationship of the material are calibrated.

In the embodiment of the invention, the display screen operates the switch, and the S3 is pressed down, and the scraper is unloaded to perform peeling treatment. S2, pressing, putting a material with a standard quantity, and calibrating the relation between the current and the quality of the material.

As a preferred embodiment, as seen in fig. 10, fig. 10 is a schematic structural diagram of an embodiment of an oscillating circuit provided by the present invention, where the controller further includes an oscillating circuit, and the oscillating circuit includes a fifth capacitor, a sixth capacitor and a crystal oscillator assembly, the fifth capacitor and the sixth capacitor are respectively electrically connected to two ends of the crystal oscillator assembly, and a section of the fifth capacitor and the sixth capacitor away from the crystal oscillator assembly is grounded.

In an embodiment of the invention, an oscillating circuit is provided to provide a basic clock signal for the system.

An embodiment of the present invention provides a scraper weighing method, and referring to fig. 11, fig. 11 is a schematic flow chart of an embodiment of the scraper weighing method provided by the present invention, based on the scraper weighing system described above, including steps S1101 to S1104, wherein:

in step S1101, a measurement current signal of the angle sensor, a lifting height of the scraper in an empty state, and a scraper length of the scraper are acquired;

in step S1102, determining a first height of the material when the scraper passes through according to the measured current signal, the elevation height and the scraper length;

in step S1103, a first ratio is determined according to the first height and the elevation height;

in step S1104, a material weight is determined based on the first height, the first ratio, and the flight length.

In the embodiment of the invention, firstly, a current signal is measured, and the lifting height of the scraper in an idle state and the scraper length of the scraper are effectively obtained; then, determining a first height of the material passing through the scraper machine based on combining the plurality of parameters; then, comparing the first height of the material passing through the scraper with the lifting height of the scraper when the scraper is empty, and determining a corresponding first proportion; and finally, correspondingly calculating the weight of the material by combining the first proportion, the length of the scraping plate and the first height.

In a specific embodiment of the present invention, as seen in conjunction with fig. 12 and 13, fig. 12 is a schematic diagram of an embodiment of the relationship between quality and current provided by the present invention, fig. 13 is a schematic diagram of an embodiment of an output current image of an angle sensor provided by the present invention, when the angle between a turning plate and a scraper in a moving direction is θ (when the turning plate is in idle state, the turning plate will shake θ to be an average value thereof), the current is 7mA, a function diagram of the shaking of the turning plate is given for a standard amount of material, the cross-sectional area of the turning plate is taken to integrate, the relationship between the height and the weight of the material is calculated, when the length of a scraper is L (m) (when the scraper is just in contact with the scraper in idle state), the passing height of the material is H (m), the lifting radian of the turning plate is α, the output current of the angle sensor is i (mA), and when the lifting height is h=l (1 = -) I.e. h=l (1->）-H，

Since the weight of the material is proportional to H, by calculating the ratio of height to weight, k (t/m), it is possible to derive the weight of the material, m=kl/>h。

When the output current is 12-20mA, the output current of the angle sensor and the weight of the material are approximately in a linear relation, and the output current and the material quantity at the moment are also in a linear relation, so that the output current can directly reflect the material quantity at the moment.

For example, after a standard amount of 60t of material is put in, the angle sensor outputs current as shown in a graph I, the current floats up and down at 18mA, the scraper machine outputs a pulse (the display circuit displays the instant material amount at the moment) every 5s of operation, and after 720 pulses, the material transmission is completed. At the moment, the instantaneous material quantity of the scraper is 60t/h, and the accumulated material quantity is 60t. The integral of 18mA minus the integral of 12mA (peeling operation) is the integral quantity (calibration operation) corresponding to 60t of material. When the scraper is in idle load, the current image output by the angle sensor is shown in a second graph, the current floats up and down at 12mA, and a pulse is output every 5s when the scraper works.

Wherein, scraper machine material conveying weighing device has solved at the material in-process of transporting, the unclear problem of transmission speed and transmission total amount. (1) The device is an angular displacement sensor, the lower end of the device is connected with a turning plate, each scraper blade is provided with a grid to induct and output a pulse to the singlechip through a gear, the singlechip receives the current output by the angular sensor, and the sensor output current is related to the angle of the scraper blade and measures the real-time material quantity through the angle change of the sensor output current. Peeling: when the current is idle, the current of the turning plate at the current angle is measured. A sample of known weight was added and the current at this angle of the flap was again measured. In this way, the relation between the material quantity and the current is obtained. When the material with unknown weight passes through, the angle of the turning plate is changed through the height of the material, the angle of the turning plate changes the output current of the angular displacement sensor, and the instantaneous material quantity is measured through the current change. And obtaining the accumulated material weight from the instantaneous material quantity.

In a specific embodiment of the present invention, as shown in fig. 14 and 15, fig. 14 is a schematic view of an embodiment of a starting-up screen of a weighing device of a scraper provided by the present invention, fig. 15 is a schematic view of an embodiment of a parameter setting screen provided by the present invention, in fig. 14, when a system is initially powered on, the system defaults to a shutdown state, and if the system is started up, an operation state is displayed and an operation indication signal y0=1 (passive dry contact output) is output through an input port x1=1 (passive dry contact input) on the back of the weighing device; x1=0, system shutdown, y0=0.

Wherein, shut down and start up specifically as follows:

the pulse count is the sensor sampling pulse count display, the range is 0-999, and when the system is in a starting state, the number is automatically increased and automatically reset to zero; otherwise, the machine is in a shutdown state or has a fault.

The 'chain pulse' is the count value of the proximity switch or the encoder pulse, the highest 999999 cycle count is automatically zeroed, and the pulse count value can be cleared by clicking a 'clear' button. If the link pulse does not increase while the system is running, this indicates that the speed sensor is faulty or dropped.

The instantaneous feed rate and PID settings in fig. 14 are as follows:

the instantaneous material conveying amount/current is the material conveying amount in unit time, the unit is ton/hour, the instantaneous material conveying current corresponding to the value is synchronously displayed, the range is 4-20mA, wherein 4mA corresponds to the lower limit of the set value of the instantaneous material conveying amount, and 20mA corresponds to the upper limit of the set value;

the PID set material conveying amount is the material conveying amount (PID set value) set during PID starting, and the PID system is continuously approaching to the set value during running, but has small range fluctuation. It should be noted that the PID local input set point is only valid in the "in-situ" operation mode, and if the "remote" mode is entered, the PID set point is controlled by the remote 4-20mA current.

The weight ratio of the level sensor AI0/AI1 in FIG. 14 is as follows:

the "weight ratio" is the ratio of the AI0 and AI1 level sensors in the calculation, which can be manually modified.

The "tare current" is the current of AI0 and AI1 after the tare weight, and the "tare operation" is detailed in the "parameter set" screen.

The "real-time current" is the current level current corresponding to AI0 and AI1, and the larger this current is, the higher the current level is.

The accumulated amount is an accumulated value (the upper limit is 9999999.9) of the conveying amount, and can be manually cleared on a parameter setting screen. When the value is increased by one pulse set value (for example, 10 tons), a pulse signal y2=1 (relay dry contact output) is output, the high level (the pulse signal lamp shows green) of the pulse signal keeps the pulse interval of two continuous 'chain pulses', and the rising edge or the falling edge of the heavy pulse signal y2=1 is recommended to be read by the remote DCS because the pulse interval time is not fixed.

It should be noted that, the main picture is only rewritable by the digital frame of PID setting material conveying amount, and the rest is read-only.

It can be understood that clicking the "parameter setting" button in the lower right corner of the main screen, inputting the authorization password, entering the "parameter setting" screen, clicking the weight proportion digital box of AI0, inputting the proportion value (0-100) of AI0, then clicking the "modification" button in the upper left corner, and automatically calculating and generating the weight proportion of AI 1.

Peeling operation flow: firstly, emptying the surplus materials of the material conveying machine, keeping the empty bin of the material conveying machine to run, and then clicking a peeling start button, so that the button is changed into a peeling state and blinks. Note that the number of the number box on the right side of the button starts to count, the time reaches more than 30 numbers (maximum 99), and the peeling is finished by clicking the blinking "peeling" button. After peeling, the current of the tare is changed into the current of the empty bin level in the current peeling operation, and the current is saved after power is lost.

The calibration operation flow is as follows: the method comprises the steps of firstly inputting the calibrated sample weight into a sample digital box, then starting a conveyor, pressing a calibration start button when the sample starts to enter the conveyor, changing the button into a calibration-in button, flashing, and waiting for the end of sample conveying. At the end of sample delivery, the calibration is ended by clicking on the flashing "peeling" button.

Clicking the accumulated material weight zero clearing button, and then resetting the accumulated material weight.

The pulse material re-metering is used for outputting a pulse for remote metering. The set value is 0-999 tons, the pulse material weight digital box can be clicked to input the set value, for example, 10 tons are set, when the current metering reaches 10 tons, the Y2 outputs a pulse, meanwhile, the pulse indicator light changes from red to green, and the pulse high-level holding time is one chain pulse period. In the running process of the machine, the current value can be seen, for example, the current value is 8.2 tons, then a pulse is output after the current value is increased by 1.8 tons, the current value is automatically cleared while the pulse is output, and the counting cycle of the next pulse material weight is restarted.

The lower limit 4mA and the upper limit 20mA of the instantaneous feeding current are respectively input at the moment, the system automatically calculates and generates the instantaneous feeding current, and the instantaneous feeding current is output through AO0 for remote display. For example, 4mA is input into "0 ton/hr", 20mA is input into "200 ton/hr", and when the instantaneous feed amount is 100 ton/hr, the AO0 outputs 12mA.

In order to avoid the phenomenon that the fluctuation of the instantaneous material conveying quantity is too large, so that the fluctuation of the instantaneous material conveying current is large, the remote DCS data reading is influenced, and a digital filtering algorithm is added to the weighing instrument. Clicking a digital box of the filtering depth to input 1-4 levels of filtering depth, wherein 1 level of filtering represents that digital filtering is not performed, and 2, 3 and 4 levels of filtering depth are gradually increased, so that fluctuation of instantaneous material conveying quantity is gradually smoother.

The correction coefficient is adjustable by 0.001-2.0 for correcting errors, the default value is 1.0, and after the conveyor operates for a period of time, a certain error may occur between the actual material conveying amount and the display material weight of the weighing instrument, at this time, a coefficient greater than 1 (such as 1.092) or less than 1 (such as 0.871) can be input into the digital frame of the correction coefficient, so that the weighing instrument can automatically correct the errors, and the material conveying amount at the later stage and the display material weight of the weighing instrument are more approximate. This correction operation can be continuously corrected in normal operation until the error reaches a satisfactory range.

The buttons are respectively an on button and an off button of the PID, and after the PID is on or off, an indicator light in the middle of the two buttons can display the PID on (green) or the PID off (red);

the remote and local buttons are used for remote and local switching respectively, and after the remote or local mode is switched, an indicator light in the middle of the two buttons is correspondingly displayed. When the remote mode is opened, the set value of the PID can be controlled only by inputting 4-20mA current through AI2, 4mA corresponds to the lower limit of the set value of 0 ton/hour, 20mA corresponds to the upper limit of the set value, the upper limit is a digital frame on the right side of the 4-20mA measuring range in FIG. 12, and the upper limit of the set value corresponding to 20mA can be input by clicking the digital frame.

The PID parameters are set, default values p=1000, i=15, d=500, ts=500 are already set when leaving the factory, but the values are not necessarily optimal, and the user can slightly adjust the values according to different working conditions.

P parameter setting: if P is too small, the PID regulating speed cannot keep up with the change of the controlled quantity (instantaneous material conveying quantity), and the PID can be invalid; if P is too large, the controlled quantity may oscillate back and forth around the target value (PID set material conveying quantity), and the system is difficult to stabilize;

i, parameter setting: the I parameter is set to a large value, so that the system can be stabilized quickly when the P parameter is regulated, and when the P parameter is regulated repeatedly to stabilize the controlled quantity, a steady-state error, namely a steady difference value between the controlled quantity and the target value, exists in the system. At the moment, the I parameter is slowly reduced, so that the stability difference is reduced, and the PID control precision is improved; however, the I parameter is too small, and the system is easy to oscillate;

d, setting parameters: increasing the value of the D parameter is beneficial to reducing the amplitude of oscillation, also called overshoot and overshoot, but if D is too large, PID is too sensitive, and instead the oscillation is easily excited;

setting parameters of Ts: the TS is the sampling time of the system, the time is determined according to the change rate of the controlled quantity, and the change rate of the controlled quantity is generally more than the second level (the chain pulse period is more than 1S) for the conveyor, so that the default setting of the TS sampling time delivery is 500ms, a user can properly fine-tune according to the running speed of the conveyor, the TS parameter is reduced if the speed of the conveyor is very fast, and otherwise, the TS parameter is properly increased.

In short, the PID parameters are set in engineering to find a popular method, and the PID parameters can be gradually optimized only according to the actual running state of the equipment.

It should be noted that, the "repair" button in the upper right corner in fig. 15 is only used for factory debugging, and the user cannot click at will.

Further, referring to fig. 16, fig. 16 is a schematic structural diagram of an embodiment of a wiring structure provided by the present invention, where the input ranges of AI0 and AI1 may be 0-20 ma or 4-20ma, because the material level is peeled;

DI: X0-X3, DO: Y0-Y3 are passive dry contacts, and COM/COM1/COM2 are electrically isolated;

x0 is a material weight pulse test signal, and when x0=1, the material weight pulse y2=1 can test a remote metering pulse;

x1 is a start-up signal, and the weighing instrument can only operate when x1=1, and y0=1 outputs an operation instruction;

x2 is NPN rotation speed pulse input, and a common COM terminal is needed for signal ground of a rotation speed sensor;

y2 is the weight pulse output, for example, one pulse y2=1 every 10 tons (set value) is reached.

The invention discloses a scraper weighing system and a scraper weighing method, wherein in the system, the lower end of an angle sensor is connected with a turning plate, so that the angle between the turning plate and the scraper is effectively measured, when the bearing weight of the scraper is changed, a measured current signal output by the angle sensor is also changed, and a controller can process the measured current signal through various circuits in a module, so that corresponding data operation is carried out, and a weight parameter is obtained. In the method, firstly, a current signal is measured, the lifting height of the scraper in an idle state and the scraper length of the scraper are effectively obtained; then, determining a first height of the material passing through the scraper machine based on combining the plurality of parameters; then, comparing the first height of the material passing through the scraper with the lifting height of the scraper when the scraper is empty, and determining a corresponding first proportion; and finally, correspondingly calculating the weight of the material by combining the first proportion, the length of the scraping plate and the first height.

According to the technical scheme, the scraper conveyor material conveying weighing device solves the problems that the conveying speed and the conveying total amount are unclear in the conveying process, the output current of the angular displacement sensor is caused by the angle change in the conveying process, and the instantaneous material quantity is measured by the current change. And obtaining the accumulated material weight from the instantaneous material quantity.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.

Claims

1. A scraper machine weighing system, comprising: the automatic scraping device comprises a turning plate, a scraper, an angle sensor and a controller, wherein the turning plate is arranged in the scraper, when the weight of the scraper changes, the movement direction angle between the scraper and the turning plate changes, the lower end of the angle sensor is connected with the turning plate, the angle sensor is used for measuring the movement direction included angle between the turning plate and the scraper and outputting a measurement current signal, the controller is used for outputting weight parameters according to the measurement current signal and comprises a power supply circuit, an induction circuit, a pulse processing circuit, a display circuit and a main control chip, the power supply circuit, the pulse processing circuit, the display circuit and the induction circuit are respectively and electrically connected to the main control chip, and the induction circuit comprises a rotation speed induction input device and an angular displacement circuit, wherein:

2. The scraper weighing system of claim 1 wherein said scraper has a gear built-in, and wherein said gear senses and outputs a pulse signal to said controller each time said gear passes a cell.

3. The scraper weighing system of claim 2, wherein the power circuit comprises a voltage regulator chip, a first capacitor, and a second capacitor, wherein a first port of the voltage regulator chip is electrically connected to the first power signal and the first capacitor, a third port of the voltage regulator chip is electrically connected to the second power signal and the second capacitor, and a second port of the voltage regulator chip is grounded.

4. A scraper weighing system according to claim 3, wherein the pulse processing circuit comprises a plurality of resistors and a photoelectric module, wherein one end of the photoelectric module is respectively electrically connected to the voltage signal and the plurality of resistors, and the other end of the photoelectric module is respectively electrically connected to the plurality of resistors, the main control chip and the power supply signal, wherein when the materials passing through the scraper reach a preset weight, a corresponding pulse signal is output to control the numerical change of the display circuit.

5. A scraper weighing system according to claim 3, wherein said display circuit comprises a display chip, an interface circuit and a brightness adjusting resistor, wherein said display chip and said interface circuit are electrically connected to said main control chip, respectively, and said display chip is electrically connected to said brightness adjusting resistor.

6. The scraper weighing system of claim 1 wherein the controller further comprises a reset circuit, wherein the reset circuit is configured to clear the accumulated material weight when the scraper weighing system is powered on.

7. The scraper weighing system of claim 1 wherein said controller further comprises a display screen operated switching circuit, said display screen operated switching circuit comprising a first switch and a second switch, said scraper being unloaded when the first switch is closed, and a peeling process being performed, and a nominal amount of material being placed when the second switch is closed, the current versus mass relationship of the material being calibrated.

8. A scraper weighing method, characterized in that it is based on a scraper weighing system according to any one of claims 1 to 7, said method comprising: