Online remote automatic scale calibration method and system

Abstract

The invention provides an on-line remote automatic scale calibration method and system, and the method comprises the steps: controlling a jack to lift and drop a scale calibration weight to a preset displacement, obtaining a first weight value of a weighing display instrument in a loading state of the scale calibration weight, calculating a first error between the first weight value and a first weight standard value, and calculating a second error between the first weight value and a second weight standard value; and when the first error is greater than a first error threshold value, generating a first calibration prompt, acquiring errors of a plurality of preset calibration points, and when the plurality of errors are greater than the error threshold value, generating a second calibration prompt. According to the method, comprehensive errors are controlled through triple calibration point verification and automatic error calculation, measurement uncertainty caused by manual intervention is avoided, and the problems of low verification efficiency and limited precision are solved.

Description

Technical Field

[0001] The present application relates to the field of automation control technology, and in particular to an online remote automatic scale calibration method and system. Background Art

[0002] As a metering device in the metallurgical blast furnace's under-the-tank charging system, the weighing accuracy of the hopper scale directly affects the accuracy of the charge ratio and blast furnace smelting efficiency. To prevent inaccurate weighing data from causing charge ratio deviations and thus affecting normal blast furnace production, the hopper scale must be periodically calibrated to ensure metering reliability.

[0003] For example, two calibration methods are used. One is to manually stack standard weights and apply the load by loading 20kg weights one by one to a total of 5 tons (about 250 weights). The other is to use a hydraulic calibration device, in which on-site personnel manually operate the hydraulic system to pressurize the hopper to complete the calibration.

[0004] The first method requires a lot of manpower and material resources to move the weights, and the second method relies on on-site manual operation and the hydraulic sensor itself has inherent errors, resulting in low calibration efficiency and limited accuracy. Summary of the Invention

[0005] The present application provides an online remote automatic scale calibration method and system to solve the problems of low calibration efficiency and limited accuracy.

[0006] In a first aspect, the present application provides an online remote automatic scale calibration method, comprising:

[0007] Control the jack to lift and lower the calibration weight to the predetermined displacement;

[0008] When the calibration weight is loaded, obtaining a first weight value of the weighing display;

[0009] Calculating a first error between the first weight value and a first weight standard value;

[0010] When the first error is greater than a first error threshold, generating a first calibration prompt;

[0011] Errors of a plurality of preset calibration points are obtained, and when the plurality of errors are all greater than the error threshold, a second calibration prompt is generated.

[0012] In some feasible embodiments, the preset calibration point includes a zero calibration point;

[0013] The method further comprises:

[0014] When the calibration weight is not loaded, obtaining a second weight value of the weighing display;

[0015] If the second weight value is not 0, remote zeroing is performed according to a predetermined zeroing condition.

[0016] In some feasible embodiments, before obtaining the second weight value of the weighing display device when the calibration weight is not loaded, the method further includes:

[0017] In response to entering the scale calibration program, obtaining a lower limit signal of the jack;

[0018] When the lower limit signal of the jack is obtained, the current weight value is recorded after the preset time;

[0019] The current weight value is determined to be zero.

[0020] In some feasible embodiments, after determining that the current weight value is zero, the method further includes:

[0021] sending a lifting instruction to the jack;

[0022] Compare the displacement signals of multiple jacks;

[0023] If the displacement signal is not in a synchronous state, generating a synchronization alarm signal;

[0024] If the displacement signal is in a synchronous state, controlling the position of the travel baffle of the jack to be raised to a limit position;

[0025] When the limit signal is obtained, a second weight value of the weighing display is obtained after a preset time.

[0026] In some feasible embodiments, the preset calibration point includes a single weight calibration point;

[0027] The method further comprises:

[0028] When the weighing display instrument displays the first weight value, a substitute having a mass of one times the standard value of the weight is loaded to obtain a third weight value of the weighing display instrument;

[0029] Calculating a second error between the third weight value and the second weight standard value, wherein the second error represents an error of the single weight calibration point;

[0030] When the second error is greater than a second error threshold, a third calibration prompt is generated.

[0031] In some feasible embodiments, the preset calibration point includes a double weight calibration point;

[0032] The method further comprises:

[0033] When the weight display instrument displays a third weight value, a substitute having a mass twice the standard value of the weight is loaded to obtain a fourth weight value of the weight display instrument;

[0034] Calculating a third error between the fourth weight value and the third weight standard value, wherein the third error represents an error of the double weight calibration point;

[0035] When the third error is greater than a third error threshold, a fourth calibration prompt is generated.

[0036] In some feasible embodiments, obtaining the errors of the plurality of preset calibration points and generating a second calibration prompt when the plurality of errors are all greater than the error threshold includes:

[0037] In response to generating the fourth calibration prompt, a second calibration prompt is generated.

[0038] In a second aspect, the present application provides an online remote automatic scale calibration system, comprising:

[0039] A weighing sensor connected to a weighing display for obtaining weight data;

[0040] a jack configured to lift and lower a weighing weight;

[0041] The controller is configured as:

[0042] Control the jack to lift and lower the calibration weight to the predetermined displacement;

[0043] When the calibration weight is loaded, obtaining a first weight value of the weighing display;

[0044] Calculating a first error between the first weight value and a first weight standard value;

[0045] When the first error is greater than a first error threshold, generating a first calibration prompt;

[0046] Errors of a plurality of preset calibration points are obtained, and when the plurality of errors are all greater than the error threshold, a second calibration prompt is generated.

[0047] In some feasible embodiments, the system further includes a remote operation interface configured to receive a calibration instruction and transmit the instruction to the controller, so as to cause the controller to execute the calibration based on the calibration instruction.

[0048] In some feasible embodiments, the system further includes an upper limit limit sensor and a lower limit limit sensor, which are arranged at the end points of the jack's stroke; the upper limit limit sensor and the lower limit limit sensor are communicatively connected to the controller and are used to send a limit signal when the jack touches the limit position;

[0049] The controller is further configured to: obtain a second weight value of the weighing display after a preset time when a limit signal is obtained.

[0050] As can be seen from the above technical solutions, the present application provides an online remote automatic scale calibration method and system, the method comprising: controlling a jack to lift and lower a calibration weight to a predetermined displacement, obtaining a first weight value of the weighing display when the calibration weight is loaded, calculating a first error between the first weight value and the first weight standard value, generating a first calibration prompt when the first error is greater than a first error threshold, obtaining errors at multiple preset calibration points, and generating a second calibration prompt when multiple errors are greater than the error threshold. The method controls the comprehensive error through triple calibration point calibration and automatic error calculation, avoiding measurement uncertainty introduced by manual intervention, and solving the problems of low calibration efficiency and limited accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0052] Figure 1 A flow chart of a method for controlling an online remote automatic scale calibration device according to an embodiment of the present application;

[0053] Figure 2 A schematic diagram of a process for generating a third calibration prompt provided in an embodiment of the present application;

[0054] Figure 3 A schematic diagram of a process for generating a fourth calibration prompt provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] The following embodiments are described in detail, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numbers in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following embodiments are not intended to represent all possible implementations consistent with the present application. They are merely examples of systems and methods consistent with certain aspects of the present application, as detailed in the claims.

[0056] like Figure 1 As shown, some embodiments of the present application provide an online remote automatic scale calibration method, comprising the following steps:

[0057] S100: Control the jack to lift and lower the calibration weight to a predetermined displacement.

[0058] The jack is an electro-hydraulic synchronous jack consisting of a hydraulic cylinder, displacement sensor, and solenoid valve control unit. Rigid connectors secure standard weights to the jack, providing vertical lifting power. The displacement sensor monitors travel position in real time, transmitting data to a programmable logic controller (PLC). The predetermined displacement is defined by upper and lower limits (weight suspended in the air). The controller uses electrical signals to drive the solenoid valve, opening and closing the hydraulic circuit to achieve lifting and lowering.

[0059] Before lifting and lowering, the controller builds a remote automatic calibration closed-loop system. After the operator triggers the one-button calibration command in the main control room, the controller first verifies whether the hydraulic station, feeder, vibrating screen and hopper bin gate are in remote mode. After the verification is passed, the gate is closed to empty the material and the hopper scale is switched to the calibration state.

[0060] First, a zero calibration point calibration is performed. In some embodiments, when the calibration weight is not loaded, a second weight value of the weighing display is obtained; if the second weight value is not 0, remote zeroing is performed according to a predetermined zeroing condition.

[0061] Before performing the calibration of the zero point, in some embodiments, in response to entering the scale calibration program, the lower limit signal of the jack is obtained; when the lower limit signal of the jack is obtained, the current weight value is recorded after a preset time; and the current weight value is determined to be zero.

[0062] The jack's lower limit signal is generated by a mechanical limit sensor mounted at the bottom of the jack's travel range. It indicates when the jack has fully descended to its lowest position. This signal is a digital switch. When the jack's travel stop contacts the sensor, the sensor outputs a high signal, which is transmitted to the programmable logic controller via the industrial bus. The lower limit position indicates that the calibration weight has completely disengaged from the hopper, ensuring the hopper is mechanically zero-loaded. The controller captures this signal in real time by polling the bus address, which serves as the trigger for entering the zero calibration phase.

[0063] A fixed preset time of ten seconds ensures the dynamic stability of the weighing system. This period allows for mechanical vibrations to decay and the load cell output to stabilize. Recording is performed by the controller, which reads the weight data from the scale indicator and stores it in the PLC database. The current weight value is acquired via the AD converter module at a 10Hz sampling rate, with an average of 10 samples taken to eliminate random noise. The weight value is stored in engineering units (kg) with an accuracy of 0.01kg for subsequent zero point determination.

[0064] The zero point is the reference weight value of the hopper scale in the no-load state. The controller uses numerical comparison logic to determine if the current weight value is within the preset tolerance range, and directly marks it as the zero point value; if it exceeds the tolerance, an alarm is triggered. The determination process does not require manual intervention, and the controller automatically completes the verification label update.

[0065] For example, upon receiving a one-touch calibration command, the controller initiates the calibration process, first closing the hopper gate and stopping the feeder to ensure there is no residual material in the hopper. Simultaneously, the controller drives three electro-hydraulic synchronous jacks to descend synchronously. The jack displacement is monitored in real time by an internal sensor. When the jack travel stop contacts the lower limit sensor, the sensor outputs a signal, which the controller reads. If all three jack signals are valid, the system determines that the position has entered a valid state.

[0066] After receiving the lower limit signals from all jacks, an internal timer is started. The preset timer is fixed at ten seconds, allowing the hydraulic system to depressurize and mechanical vibrations to subside. During the timer, the controller continuously monitors the output of the weighing display. If weight fluctuations exceed the stability threshold, the preset timer is automatically extended until stabilization occurs. After the preset timer expires, the controller sends a data acquisition command to the weighing transmitter, which performs 10 high-speed sampling operations, calculates the average value, and stores it as the current weight value.

[0067] The recorded current weight value is transmitted to the PLC database, where the controller calls the preset tolerance parameters. If the weight value is within tolerance, it is marked as the zero value and stored in the calibration record. If it is out of tolerance, a zero point abnormality alarm is generated, pausing the process. The zero point value serves as the benchmark for subsequent single weight calibrations and is directly used in error calculations.

[0068] Among them, the lower limit signal ensures that the jack touches the ground, avoiding the false zero point problem caused by the weight not being completely separated in the traditional method.

[0069] When the operator triggers the one-button calibration command in the main control room, the jack position is first confirmed through the lower limit signal, the weight value is recorded with a delay and the zero point is determined. Then, the zero point calibration preparatory actions are performed, including hopper emptying and equipment remote mode verification. The entire process is closed-loop controlled by the programmable logic controller, eliminating the need for manual intervention and ensuring the accuracy of zero point calibration.

[0070] The zero calibration point is defined as the reference state of the hopper scale when no calibration weights are applied. At this point, the hopper is completely empty and the jack is at its lower limit, allowing the weights to fall completely to the floor. The theoretical expected value of the weight indicator is zero. This state is used to detect zero drift errors in load cells.

[0071] In the unloaded state, the hopper gate closes, the vibrating screen and feeder stop, and there's no residual material. The jack drops to its lower limit, the travel stop triggers the limit sensor, and the weights are no longer in contact with the hopper. For example, the controller uses the real-time hopper weight curve to determine state stability. When the weight fluctuation is less than 0.1% FS for 30 consecutive seconds, the system enters the effective unloaded state.

[0072] The controller reads the AD conversion value output by the weighing display, digitally filters it, and converts it to engineering units (kg). This is recorded as the second weight value, A0. This value is acquired after the jack has been stationary for 10 seconds to avoid mechanical vibration interference. This value is then transmitted to the PLC database via Industrial Ethernet and compared with the theoretical zero value (0kg).

[0073] If A0 exceeds the threshold, it indicates that the sensor has zero point drift or mechanical structure abnormality. In this case, no manual on-site adjustment is required, and the controller automatically triggers remote zeroing, which is the predetermined zeroing condition.

[0074] The traditional method requires manual weight transfer to the hopper to simulate an empty state, which is time-consuming and unable to detect small zero drifts. This embodiment eliminates the need for weight transfer through automatic state determination and remote zeroing, thus shortening the zero calibration time.

[0075] In the process of obtaining the second weight value of the weighing display, in some embodiments, a lifting instruction is sent to the jack. The lifting instruction is generated by the controller and transmitted to the solenoid valve control unit of the hydraulic station via industrial Ethernet. The instruction is a specifically coded pulse signal, such as binary code 0001 representing a lifting action, which drives the solenoid valve to switch the direction of the hydraulic oil circuit, so that the jack hydraulic cylinder is filled with oil and lifted. The lifting instruction is triggered only when the jack is at the lower limit position and the zero point calibration is completed to ensure the correct timing of the action.

[0076] Compare the displacement signals of multiple jacks. The displacement signals are generated by a linear encoder installed on the jack piston rod, which provides real-time feedback of the piston stroke position. The displacement data of the three jacks are synchronously collected, and the real-time difference between them is calculated. If the displacement difference between any two jacks exceeds the threshold, it is determined to be in an unsynchronized state.

[0077] If the displacement signal is not in a synchronized state, a synchronization alarm signal is generated. For example, the synchronization alarm signal may include three levels of alarms. The first level alarm is to push a yellow warning icon and the text "Jack displacement is not synchronized"; the second level alarm is to lock the hydraulic system and stop the power supply to the solenoid valve; the third level alarm is to generate a fault diagnosis report, prompting you to check for blockage in the hydraulic oil circuit or deformation of the mechanical connector.

[0078] If the displacement signal is in the synchronized state, the jack's travel baffle is controlled to raise to its limit position. In this synchronized state, the PLC continuously outputs lift commands until the travel baffle contacts the limit sensor, a mechanical microswitch installed at the top of the jack's travel range. When the baffle presses against the sensor's trigger plate, a high-level signal (24VDC) is output, signaling the end of the lift.

[0079] When the limit signal is received, the second weight value of the weighing display is obtained after a preset time. After the upper limit signal is triggered, the PLC starts the static stability timer (fixed at 10 seconds). When the timer ends, the weighing display performs 10 samplings, eliminates the extreme values, and takes the average value as the second weight value B1 (unit: kg, accuracy: 0.01kg). This value is used to calculate the single weight calibration error.

[0080] For example, the controller checks the status of the three lower limit signals. If the signal remains valid (high level), a lifting enable command is sent to the hydraulic station. The hydraulic solenoid valve is energized and pressure oil is injected into the jack cylinder. The displacement encoder feeds back data to the PLC at a frequency of 100Hz. The controller calculates the maximum displacement deviation every 200ms. If the maximum displacement deviation is less than or equal to the threshold, the lifting continues; if the maximum displacement deviation is greater than the threshold, the solenoid valve power is cut off, an alarm signal is sent to the main control room, and a prompt is given to check the hydraulic pipeline or sensor wiring.

[0081] When any jack's travel plate touches the upper limit sensor, the sensor signal jumps to a high level. The controller verifies the synchronization of the three signals: if all three signals jump within 500ms, it is considered synchronized; otherwise, a limit signal abnormality alarm is generated.

[0082] After confirming that it is in place, the system is left to stand for 10 seconds to eliminate mechanical vibration. The weighing transmitter performs 10 AD samplings (sampling interval is 1 second), removes the maximum and minimum values, calculates the average, and stores the result as the second weight value.

[0083] S200: Acquire a first weight value of the weighing display device when the calibration weight is loaded.

[0084] The weighing display is connected to the hopper scale's load cell to collect weight data. The calibration weight loading state is divided into a full load state (when the weight is raised to the upper limit) and a zero load state (when the weight is lowered to the lower limit). To obtain the first weight value, wait for at least ten seconds after the jack remains stationary at the limit, record the stable value, and then transmit it to the controller via the industrial bus for storage.

[0085] S300: Calculating a first error between the first weight value and a first weight standard value.

[0086] The first weight standard value is a pre-stored calibration constant, and the controller calculates an absolute difference between the first weight value and the standard value as a first error.

[0087] S400: When the first error is greater than a first error threshold, a first calibration prompt is generated.

[0088] Among them, the first error threshold in this embodiment is 5‰. If the error exceeds the threshold of 5 / 1000 of the standard value of the weight, the controller will suspend the calibration process, lock the jack hydraulic system, send a specific coded alarm instruction to the human-machine interface, and record the fault timestamp and error value.

[0089] S500: Obtain errors of multiple preset calibration points, and generate a second calibration prompt when the multiple errors are all greater than the error threshold.

[0090] Multiple preset calibration points cover zero, single-weight, and double-weight verification stages. The controller executes each stage of verification sequentially. When all errors exceed a threshold, the process is terminated, an audible and visual alarm is activated, and a system lock command is sent to the maintenance terminal.

[0091] The zero point is described in step S100. For the single weight calibration point, the single weight calibration point refers to the state where the standard weight is fully loaded into the hopper. In this state, the three jacks synchronously lift the weight to the upper limit position, and the weight is in rigid contact with the hopper through the connecting piece. The theoretical expected value of the weighing display is the standard weight mass (denoted as W s ), used to detect the linearity error of the weighing sensor in the middle of the full range.

[0092] In some embodiments, when the weighing display shows a first weight value, a substitute with a mass of one times the standard weight value is loaded to obtain a third weight value of the weighing display, wherein doubling means loading a substitute with the same mass on the basis of a single weight, and the controller sets the hopper scale target value to 2W. s , start the vibrating screen and feeder to add the replacement material. After loading is completed, when the detection weight value is stable, it is determined to be double loaded.

[0093] like Figure 2 As shown, the third weight value refers to the stable reading of the weighing indicator under double load. Acquisition conditions include the jack being at its upper limit, the surrogate loaded, and remaining stationary for at least 10 seconds to eliminate mechanical vibration. A second error is then calculated between the third weight value and the second weight standard value. This second error represents the measurement deviation of the single-weight calibration point under double load. When the second error exceeds the second error threshold, a third calibration prompt is generated.

[0094] It is understandable that the third calibration prompt is a determining condition for the second calibration prompt. In this embodiment, the weight substitute is loaded through the automatic feeding system, which shortens the preparation time for double loading and eliminates manpower consumption.

[0095] For the double weight calibration point, in some embodiments, when the weight display instrument displays the third weight value, a substitute having a mass twice the weight standard value is loaded to obtain a fourth weight value of the weight display instrument;

[0096] Calculating a third error between the fourth weight value and the third weight standard value, wherein the third error represents an error of the double weight calibration point;

[0097] like Figure 3 As shown, when the third error is greater than the third error threshold, a fourth calibration prompt is generated.

[0098] The double weight calibration point refers to the state where a single standard weight and a double weight substitute are loaded simultaneously (the total load is three times the standard weight). In this state, the jack lifts the standard weight to the upper limit position, so that the weight's gravity acts completely on the hopper; the hopper is loaded with a substitute with the same density as the standard weight (such as iron ore), and the mass is precisely controlled to 2W. s This calibration point is used to detect the nonlinear error of the weighing sensor in the range of 75%-100% of the full scale.

[0099] Increasing by two means adding an equal amount of substitutes on the basis of double load, so that the total load reaches three times the standard value. The controller sets the hopper target value to 3W. s The vibrating screen and feeder add the substitute at a constant flow rate, with the jack maintained at its upper limit. After the substitute is loaded, the weight fluctuation lasts for 30 seconds. The weight display is left to stand for 10 seconds to eliminate dynamic interference. Eight valid samples are collected from the weighing display, and the average is taken as the fourth weight value. The third error is calculated using the third weight standard value. This error represents the measurement deviation of the double-weight calibration point under full-scale load.

[0100] When the third error exceeds the third error threshold, a fourth calibration prompt is generated. It is understood that the fourth calibration prompt also serves as a condition for determining the second calibration prompt. When the errors at the zero, single, and double calibration points all exceed the threshold, or when the fourth calibration prompt is generated, a second calibration prompt is generated.

[0101] This method improves the calibration efficiency of hopper scales, enables remote automated control of hopper scales, and reduces the workload of maintenance personnel. It effectively avoids the harsh working environment and numerous hazardous factors faced by instrument maintenance workers, thereby enhancing the level of intelligent control. Remote automated calibration improves labor productivity, management capabilities, and production control accuracy. It also provides accurate data for blast furnaces, enabling effective control of production costs.

[0102] Based on the above-mentioned online remote automatic weighing calibration method, some embodiments of the present application further provide an online remote automatic weighing calibration system, including:

[0103] The load cell is connected to the weighing display and is used to obtain weight data. The load cell uses a strain gauge pressure sensing element and is rigidly mounted between the hopper scale support column and the base by bolts. Its structure includes a Wheatstone bridge circuit, which converts the hopper load into a voltage signal in real time and transmits it to the weighing display via a cable.

[0104] The jacks are configured to lift and lower the weighing weights. In this embodiment, the jacks are three electric hydraulic synchronous jacks, and their structure includes: a hydraulic cylinder, a displacement sensor and a solenoid valve group. The jacks are rigidly fixed to the standard weights through alloy steel connectors to form a force transmission chain.

[0105] The controller is configured as:

[0106] Control the jack to lift and lower the calibration weight to the predetermined displacement;

[0107] When the calibration weight is loaded, obtaining a first weight value of the weighing display;

[0108] Calculating a first error between the first weight value and a first weight standard value;

[0109] When the first error is greater than a first error threshold, generating a first calibration prompt;

[0110] Errors of a plurality of preset calibration points are obtained, and when the plurality of errors are all greater than the error threshold, a second calibration prompt is generated.

[0111] The controller uses an industrial-grade programmable logic controller (PLC), including a CPU module for executing scale calibration logic operations, an analog input module for collecting weighing sensor signals, a digital output module for controlling the on and off of the solenoid valve and driving the jack up and down, and a communication module for real-time data interaction with the weighing display and monitoring system.

[0112] In some embodiments, the system further includes a remote operation interface configured to receive calibration instructions and transmit them to the controller, causing the controller to execute calibration based on the calibration instructions. The remote operation interface utilizes an HMI touch screen, located on the main control console in the batching room. The interface includes a display, physical buttons, and a communication module. The physical buttons may include an emergency stop button, a status indicator light, and a dedicated one-touch calibration button. The communication module includes dual network ports and is connected to the controller via an industrial switch.

[0113] In some embodiments, the system further includes an upper limit limit sensor and a lower limit limit sensor, which are arranged at the end points of the jack's stroke; the upper limit limit sensor and the lower limit limit sensor are communicatively connected to the controller and are used to send a limit signal when the jack touches the limit position;

[0114] The upper limit sensor uses a mechanical microswitch installed at the end of the jack's hydraulic cylinder piston rod's travel. A trigger plate is rigidly connected to the piston rod. When the piston rod's displacement is greater than or equal to a preset value, the sensor trigger plate is pressed, outputting a high-level signal.

[0115] The lower limit sensor is similar to the upper limit sensor. The micro switch is installed at the zero point of the jack base stroke and is triggered when the piston rod is fully retracted.

[0116] The controller is further configured to: obtain a second weight value of the weighing display after a preset time when a limit signal is obtained.

[0117] It is understandable that the method for configuring the controller in the system can be referred to the content of the above method, which will not be described in detail here.

[0118] The original requirement was to move 250 20-kilogram weights (total weight 5 tons). This application uses three hydraulic jacks to automatically lift the standard weights, eliminating manual handling and stacking time. Furthermore, through triple calibration points and automatic error calculation, the overall error is controlled within 0.5%, eliminating measurement uncertainty introduced by manual intervention.

[0119] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without expending creative work shall fall within the scope of protection of this application.

Claims

1. An online remote automatic scale calibration method, characterized in that: include: Control the jack to lift and lower the calibration weight to the predetermined displacement; Acquiring a first weight value of a weighing display device when the calibration weight is loaded; Calculating a first error between the first weight value and a first weight standard value; When the first error is greater than a first error threshold, generating a first calibration prompt; Errors of a plurality of preset calibration points are obtained, and when the plurality of errors are all greater than the error threshold, a second calibration prompt is generated.

2. The online remote automatic scale calibration method according to claim 1, characterized in that: The preset calibration point includes a zero calibration point; The method further comprises: When the calibration weight is not loaded, obtaining a second weight value of the weighing display; If the second weight value is not 0, remote zeroing is performed according to a predetermined zeroing condition.

3. The online remote automatic weighing calibration method according to claim 2, characterized in that: Before obtaining the second weight value of the weighing display device in the unloaded state of the calibration weight, the method further includes: In response to entering the scale calibration program, obtaining a lower limit signal of the jack; When the lower limit signal of the jack is obtained, the current weight value is recorded after the preset time; The current weight value is determined to be zero.

4. The online remote automatic scale calibration method according to claim 3, characterized in that: After determining that the current weight value is zero, the method further includes: sending a lifting instruction to the jack; Compare the displacement signals of multiple jacks; If the displacement signal is not in a synchronous state, generating a synchronization alarm signal; If the displacement signal is in a synchronous state, controlling the position of the travel baffle of the jack to be raised to a limit position; When the limit signal is obtained, a second weight value of the weighing display is obtained after a preset time.

5. The online remote automatic scale calibration method according to claim 1, characterized in that: The preset calibration points include single weight calibration points; The method further comprises: When the weighing display instrument displays the first weight value, a substitute having a mass of one times the standard value of the weight is loaded to obtain a third weight value of the weighing display instrument; Calculating a second error between the third weight value and the second weight standard value, wherein the second error represents an error of the single weight calibration point; When the second error is greater than a second error threshold, a third calibration prompt is generated.

6. The online remote automatic weighing calibration method according to claim 5, characterized in that: The preset calibration points include double weight calibration points; The method further comprises: When the weight display instrument displays a third weight value, a substitute having a mass twice the standard value of the weight is loaded to obtain a fourth weight value of the weight display instrument; Calculating a third error between the fourth weight value and the third weight standard value, wherein the third error represents an error of the double weight calibration point; When the third error is greater than a third error threshold, a fourth calibration prompt is generated.

7. The online remote automatic weighing calibration method according to claim 6, characterized in that: The obtaining of errors of a plurality of preset calibration points and generating a second calibration prompt when the plurality of errors are all greater than the error threshold includes: In response to generating the fourth calibration prompt, a second calibration prompt is generated.

8. An online remote automatic scale calibration system, characterized in that: include: A weighing sensor connected to a weighing display for obtaining weight data; a jack configured to lift and lower a weighing weight; The controller is configured as: Control the jack to lift and lower the calibration weight to the predetermined displacement; When the calibration weight is loaded, obtaining a first weight value of the weighing display; Calculating a first error between the first weight value and a first weight standard value; When the first error is greater than a first error threshold, generating a first calibration prompt; Errors of a plurality of preset calibration points are obtained, and when the plurality of errors are all greater than the error threshold, a second calibration prompt is generated.

9. The online remote automatic scale calibration system according to claim 8, characterized in that: The system further includes a remote operation interface configured to receive a calibration instruction and transmit the instruction to the controller, so as to enable the controller to execute the calibration based on the calibration instruction.

10. The online remote automatic scale calibration system according to claim 8, characterized in that: The system further includes an upper limit limit sensor and a lower limit limit sensor, which are arranged at the end points of the jack's stroke; the upper limit limit sensor and the lower limit limit sensor are communicatively connected to the controller and are used to send a limit signal when the jack touches the limit position; The controller is further configured to: obtain a second weight value of the weighing display after a preset time when a limit signal is obtained.

Images