Automatic calibration device and calibration method for electronic scale

Abstract

The present invention relates to the technical field of electronic scale calibration, and in particular to an automatic calibration device for an electronic scale and a calibration method thereof. The electronic scale is placed on a carrier, and the calibration work of the electronic scale is realized through a calibration unit in a calibration area. At the same time, a tapping operation is performed on an operation area of ​​the electronic scale through a tapping unit to realize the calibration of different functions of the electronic scale, thereby minimizing the intensity of manual operation. The device can adapt to electronic scales of different specifications through the installation position of a tapping mechanism, and has a wide range of applications and high working efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of electronic scale calibration, and in particular to an automatic calibration device for an electronic scale and a calibration method thereof. Background Art

[0002] With the continuous prosperity of my country's market economy, the development speed of my country's metrology industry has been rapid, and the metrology demand in all walks of life has been increasing day by day, resulting in an increase in the volume of metrology business in the market year by year. In the field of trade settlement, electronic scales play an important role, with a large market share, a wide range of applications, and a high degree of fit with people's livelihood. Therefore, in order to ensure the accuracy and reliability of the measurement performance of electronic scales, it is necessary to calibrate them regularly to determine whether they are qualified. Therefore, the calibration of electronic scales is an important guarantee for fair market transactions.

[0003] At present, the calibration process of electronic scales is mostly carried out by manually clamping weights frequently to calibrate the electronic scale's metrological characteristics such as overloading, repeatability, weighing, taring weighing, and discrimination threshold. According to the calibration methods and steps required by the national calibration regulations, the calibration operation of an electronic scale takes 40 to 50 minutes. After the calibration operation, a large amount of calibration data needs to be calculated, and then a corresponding certificate is issued based on the calibration results. The entire calibration cycle is long and the work efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to provide an automatic calibration device for electronic scales and a calibration method thereof, so as to realize automatic calibration of electronic scales of various specifications, reduce the intensity of manual operation and improve work efficiency.

[0005] The present invention solves the above-mentioned technical problems by:

[0006] An automatic calibration device for an electronic scale, characterized in that it comprises a carrying area and a calibration area located above the carrying area, wherein the carrying area is provided with a carrying platform for placing the electronic scale, the carrying platform is provided with a tapping unit for tapping the electronic scale operation area, and the calibration area is provided with a calibration unit for calibrating the electronic scale.

[0007] It is further defined that the supporting platform includes a bottom platform, a planar driving mechanism, a first vertical driving mechanism and a weighing platform, the first vertical driving mechanism is connected to the bottom platform to drive the bottom platform to reciprocate up and down, the weighing platform is connected to the bottom platform through the planar driving mechanism, the planar driving mechanism drives the weighing platform to move on the bottom platform, the clicking unit is located on the weighing platform, and the calibration unit is located above the weighing platform.

[0008] It is further defined that the verification unit includes a tray mechanism, a second vertical drive mechanism, a main flange plate, an upper flange plate, and a plurality of flash weight mechanisms;

[0009] The second vertical driving mechanism is located outside the main flange plate and connected to the main flange plate, so that the second vertical driving mechanism drives the main flange plate to move up and down;

[0010] The pallet mechanism comprises a pallet, a pallet drive and a pallet tooling, wherein the pallet is located below the general flange plate, the pallet drive is arranged on the general flange plate, the upper flange is located between the general flange plate and the pallet and connected to the general flange plate, the top end of the pallet tooling is connected to the telescopic end of the pallet drive, the bottom end of the pallet tooling passes through the upper flange plate and is movably connected to the pallet, and the weighing platform is located below the pallet;

[0011] The flash-change weight mechanism is located between the upper flange and the tray, and includes a flash-change weight, a flash-change tooling and a flash-change drive which are arranged in sequence from bottom to top. The fixed end of the flash-change drive is connected to the upper flange, the output end of the flash-change drive is connected to the flash-change tooling, the flash-change weight is movably connected to the flash-change tooling, the flash-change weight is arranged opposite to the tray, and a plurality of the flash-change weight mechanisms are arranged around the axis of the tray.

[0012] It is further defined that the verification unit also includes a weight string, an offset weight mechanism and a zeroing weight mechanism;

[0013] The weight string includes a plurality of weights which are connected in series from top to bottom and have the same mass and / or different mass, and the adjacent weights are movably connected, and the centers of the tray, the main flange plate and the upper flange plate are all provided with weight string holes, and the inner diameters of the weight string holes are all larger than the outer diameters of any weight in the weight string, and the weight string is arranged along the axis of the weight string holes, and the plurality of flashing weight mechanisms are arranged on the peripheral side of the weight string;

[0014] The eccentric load weight mechanism includes an eccentric load weight, an eccentric load fixture and an eccentric load drive, the eccentric load drive is arranged in parallel with the flicker drive, the fixed end of the eccentric load drive is connected to the upper flange, the output end of the eccentric load drive is connected to the eccentric load fixture, the eccentric load weight is movably connected to the eccentric load fixture, an eccentric load hole is opened on the tray, and the eccentric load weight is coaxially arranged with the eccentric load hole;

[0015] The zeroing weight mechanism includes a zeroing weight, a zeroing tool and a zeroing drive. The zeroing drive is arranged in parallel with the flicker drive. The fixed end of the zeroing drive is connected to the upper flange, the output end of the zeroing drive is connected to the zeroing tool, the zeroing weight is movably connected to the zeroing tool, and the zeroing weight is arranged opposite to the tray.

[0016] It is further defined that the calibration unit also includes a taring weight mechanism, the taring weight mechanism includes a taring weight, a taring tool and a taring drive, the taring drive and the pallet drive are arranged in parallel, the taring drive is connected to the main flange plate, the taring drive is connected to the taring weight through the taring tool, the taring tool is movably connected to the taring weight, and the taring weight mechanism is arranged on the peripheral side of the pallet.

[0017] It is further defined that the calibration unit also includes an identification threshold weight mechanism, the identification threshold weight mechanism includes an identification threshold weight, an identification threshold tooling and an identification threshold drive, the identification threshold drive is arranged relative to the zeroing drive, the identification threshold drive and the flicker drive are arranged in parallel, the fixed end of the identification threshold drive is connected to the upper flange, the output end of the identification threshold drive is connected to the identification threshold tooling, the identification threshold weight is movably connected to the identification threshold tooling, and the identification threshold weight is arranged relative to the tray.

[0018] An automatic calibration method for an electronic scale, based on the above-mentioned automatic calibration device for an electronic scale, is characterized in that it includes zero calibration, and the zero calibration includes the following steps:

[0019] Determine the mass of the tray and the mass of the flicker weight in the calibration unit according to the range of the electronic scale;

[0020] The electronic scale is placed on the weighing platform, and the first vertical driving mechanism drives the weighing platform to move upward to the calibration area;

[0021] The second vertical driving mechanism drives the tray to move downward through the main flange plate until it contacts the weighing surface of the electronic scale;

[0022] The pallet drive drives the pallet tooling to move downward so that the electronic scale carries the mass of the pallet and records the value displayed on the electronic scale;

[0023] Multiple flicker weight mechanisms sequentially place flicker weights on the tray sequentially through corresponding flicker drives so that the electronic scale carries the mass of the corresponding number of flicker weights until the value displayed on the electronic scale changes, and the value displayed on the electronic scale at this time is recorded.

[0024] An automatic calibration method for an electronic scale, based on the above-mentioned automatic calibration device for an electronic scale, is characterized in that it includes zero calibration, and the zero calibration includes the following steps:

[0025] Determine the mass of the tray and the mass of the flicker weight in the calibration unit according to the range of the electronic scale;

[0026] The electronic scale is placed on the weighing platform, and the first vertical driving mechanism drives the weighing platform to move upward to the calibration area;

[0027] The second vertical driving mechanism drives the tray to move downward through the main flange plate until it contacts the weighing surface of the electronic scale;

[0028] The pallet driver drives the pallet tooling to move downward so that the electronic scale carries the pallet mass L and records the value I displayed on the electronic scale 1 ;

[0029] Multiple flicker weight mechanisms place flicker weights on the tray in sequence through corresponding flicker drives so that the electronic scale carries the mass △L of the corresponding number of flicker weights. 1 , until the value displayed on the electronic scale increases by one scale value d, and record the value displayed on the electronic scale at this time I 1 +d;

[0030] By E 0 =I 1 +0.5d-△L 1 -L calculates the integral error E of the zero calibration 0 According to the verification regulations, the integral error E 0 Determine whether the zero calibration result of the electronic scale is qualified;

[0031] The plurality of flicker weight mechanisms drive the flicker weights placed on the electronic scale to rise through flicker driving until all the flicker weights are separated from the electronic scale.

[0032] An electronic scale calibration method, the above-mentioned electronic scale automatic calibration device is characterized by further comprising an eccentric load calibration and a weighing calibration;

[0033] The eccentric load test includes the following steps:

[0034] Determine the mass of the eccentric load weight, the mass of the zero weight and the mass of the weight string according to the measuring range of the electronic scale;

[0035] The electronic scale completes the zero calibration and obtains the zero calibration integral error E 0 ;

[0036] The eccentric load drive places the eccentric load weight on the weighing surface of the electronic scale through the eccentric load tooling so that the electronic scale bears the mass of the eccentric load weight;

[0037] The pallet drive drives the pallet tooling to move upward until the pallet is separated from the electronic scale;

[0038] The weighing platform drives the electronic scale to move through the plane driving mechanism so that the calibration unit is located at the detection point of the corresponding position of the electronic scale, and at the same time, the eccentric load weight is separated from the eccentric load fixture and moves synchronously with the electronic scale;

[0039] The first vertical driving mechanism drives the electronic scale to move upward through the weighing platform so that the weight string passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism drives the main flange plate and the electronic scale to move upward synchronously until the first vertical driving mechanism stops when the electronic scale carries the mass of the weight string.

[0040] The pallet drive drives the pallet tooling to move downward until the electronic scale carries the mass L of the pallet;

[0041] The zeroing drive drives the zeroing weight to move downward onto the tray, so that the electronic scale bears the mass of the zeroing weight and records the value I displayed on the electronic scale. 2 ;

[0042] Multiple flicker weight mechanisms place flicker weights on the tray in sequence through corresponding flicker drives so that the electronic scale carries the mass △L of the corresponding number of flicker weights. 2 , until the value displayed on the electronic scale increases by one scale value d, and record the value displayed on the electronic scale at this time I 2 +d;

[0043] By E c =EE 0 Calculate the correction error E of each detection point in the eccentric load verification c , where E 0 =I 1 +0.5d-△L 1 -L, E = I 2 +0.5d-△L 2 -L;

[0044] Compare the correction error obtained by measuring the same load at different positions of the electronic scale with the absolute value of the maximum allowable error specified in the verification regulations to determine whether the electronic scale eccentric load verification result is qualified;

[0045] The weighing platform drives the electronic scale to move to the initial position through the plane driving mechanism;

[0046] The multiple flicker weight mechanisms drive the flicker weights placed on the electronic scale to rise through the flicker drive until all the flicker weights are separated from the electronic scale;

[0047] The eccentric load drive drives the eccentric load weight to move upward and separate from the pallet;

[0048] The zero setting drive drives the zero setting weight to move upward and separate from the tray;

[0049] The tray drive drives the tray to move upward to separate the tray from the electronic scale;

[0050] The first vertical driving mechanism drives the electronic scale to move downward through the weighing platform so that the weight string is separated from the weighing surface of the electronic scale;

[0051] Weighing verification includes the following steps:

[0052] The electronic scale completes the eccentric load verification;

[0053] The second vertical driving mechanism drives the tray to move downward through the main flange plate until it contacts the weighing surface of the electronic scale;

[0054] The pallet drive drives the pallet tooling to move downward until the electronic scale carries the mass of the pallet, and the total mass carried by the electronic scale reaches the mass at the load point corresponding to the lift indication error, and the value displayed by the electronic scale is recorded;

[0055] The zeroing drive drives the zeroing weight to move downward onto the tray, so that the electronic scale carries the mass of the zeroing weight. The total mass carried by the electronic scale reaches the mass of the load point corresponding to the lift indication error, and the value displayed by the electronic scale is recorded;

[0056] The eccentric load drive places the eccentric load weight on the weighing surface of the electronic scale through the eccentric load tooling so that the electronic scale bears the mass of the eccentric load weight;

[0057] The first vertical driving mechanism drives the electronic scale to move upward through the weighing platform so that the weight string passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism drives the total flange plate and the electronic scale to move upward synchronously, so that the electronic scale gradually carries the mass of the weight string until the total mass carried by the electronic scale reaches the mass of the corresponding lift indication error load point. The first vertical driving mechanism stops, and the value displayed by the electronic scale at this time is recorded.

[0058] The first vertical driving mechanism drives the electronic scale to continue to move upward through the weighing platform, and at the same time, the second vertical driving mechanism drives the main flange plate and the electronic scale to move upward synchronously, so that the electronic scale sequentially carries the lift indication error load point and records the electronic scale display value at the corresponding time, completing the weighing of the corresponding load point;

[0059] The first vertical driving mechanism drives the electronic scale to move downward through the weighing platform, and the second vertical driving mechanism drives the main flange plate and the electronic scale to move downward synchronously, so that the electronic scale sequentially carries the return indication error load point and records the electronic scale display value at the corresponding time until the weight string is separated from the load-bearing end surface of the electronic scale;

[0060] The eccentric load drive drives the eccentric load weight to move upward and separate from the tray, and the value displayed on the electronic scale is recorded at this time to complete the weighing of all return indication error load points.

[0061] An electronic scale calibration method, the above-mentioned electronic scale automatic calibration device is characterized by further comprising taring weighing calibration and repeatability calibration;

[0062] The peeling and weighing verification comprises the following steps:

[0063] Tare and zero setting:

[0064] The electronic scale completes weighing verification;

[0065] Determine the mass of the tared weight according to the range of the electronic scale;

[0066] The tare drive drives the tare weight to move downward through the tare tooling so that the electronic scale bears the mass of the tare weight;

[0067] Press the tare button in the operation area of ​​the electronic scale by pressing the tap unit;

[0068] Weighing after peeling:

[0069] The second vertical driving mechanism drives the tray to move downward through the main flange plate until it contacts the weighing surface of the electronic scale;

[0070] The tray drive drives the tray tooling to move downward until the electronic scale bears the mass of the tray, and the zeroing drive drives the zeroing weight to move downward onto the tray, so that the electronic scale bears the mass of the zeroing weight. At this time, the load carried by the electronic scale during taring weighing is L b1 , record the value I displayed on the electronic scale at this time b1 , complete one lift measurement load bearing;

[0071] Multiple flicker weight mechanisms sequentially place flicker weights on the tray in turn through corresponding flicker drives, so that the electronic scale carries the mass △L of the corresponding number of flicker weights. b1 , until the value displayed on the electronic scale increases by one scale value d, and record the value displayed on the electronic scale at this time I b1 +d, then the flicker drive drives all flicker weights to separate from the electronic scale, through E b1 =I b1 +0.5d-△L b1 -L b1 Calculate the weighing error of the measured load;

[0072] The eccentric load drive places the eccentric load weight on the weighing surface of the electronic scale through the eccentric load tooling so that the electronic scale bears the mass of the eccentric load weight;

[0073] The first vertical drive mechanism drives the electronic scale to move upward through the weighing platform so that the weight string passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical drive mechanism drives the main flange plate and the electronic scale to move upward synchronously, so that the mass of the weight string is gradually loaded on the weighing surface of the electronic scale. Every time the load of the electronic scale reaches a lift measurement load L bn Then, record the displayed value I of the electronic scale at the corresponding time bn Then, multiple flicker weight mechanisms drive the mass △L through the corresponding flicker bn The flashing weights are placed on the tray in sequence until the electronic scale displays an increase in the scale value, and the value displayed on the electronic scale is recorded. bn +d after the flash drive drives all flash weights to separate from the electronic scale, through E bn =I bn +0.5d-△L bn -L bn Calculate the weighing error of the measured load, n = (1, 2, ..., n) until the corresponding lift measurement load is loaded;

[0074] The first vertical drive mechanism drives the electronic scale to move downward through the weighing platform, and the second vertical drive mechanism drives the main flange plate and the electronic scale to move downward synchronously, so that the weight string gradually leaves the weighing surface of the electronic scale. Whenever the electronic scale reaches a return measurement load L Bn Then, record the displayed value I of the electronic scale at the corresponding time Bn Then, multiple flicker weight mechanisms are driven by corresponding flicker weights to place flicker weights on the tray in sequence until the electronic scale displays an increase in a scale value, and the value I displayed on the electronic scale is recorded. Bn +d after the flash drive drives all flash weights to separate from the electronic scale, through E Bn =I Bn +0.5d-△L Bn -L Bn Calculate the weighing error of the measured load until the weight string leaves the weighing surface of the electronic scale and completes the return measurement load bearing;

[0075] According to the verification procedure, the weighing error E Bn Determine whether the electronic scale zero calibration is qualified;

[0076] The eccentric load drive drives the eccentric load weight to move upward and separate from the pallet;

[0077] The tray drive drives the tray to move upward to separate the tray from the electronic scale;

[0078] The tare drive drives the tare weight to move upward and separate from the electronic scale;

[0079] Press the zero button in the electronic scale operation area by clicking the unit;

[0080] The repeatability test comprises the following steps:

[0081] Determine the mass of the weight string according to the range of the electronic scale;

[0082] The electronic scale is placed on the weighing platform, and the first vertical driving mechanism drives the electronic scale to move upward to the calibration area through the weighing platform;

[0083] The first vertical driving mechanism drives the electronic scale to move upward through the weighing platform so that the weight string passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism drives the main flange plate and the electronic scale to move upward synchronously. When the electronic scale bears the mass of the weight string, the first vertical driving mechanism stops and records the value displayed on the electronic scale.

[0084] Press the zero button in the electronic scale operation area by clicking the unit;

[0085] Repeat the following steps multiple times:

[0086] The first vertical driving mechanism drives the electronic scale to move downward through the weighing platform, and the second vertical driving mechanism drives the main flange plate and the electronic scale to move downward synchronously until the weight string is separated from the electronic scale;

[0087] The first vertical driving mechanism drives the electronic scale to move upward through the weighing platform so that the weight string passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism drives the main flange plate and the electronic scale to move upward synchronously. When the electronic scale bears the mass of the weight string, the first vertical driving mechanism stops and records the value displayed on the electronic scale.

[0088] Whether the repeated calibration results of the electronic scale are qualified is determined by comparing the difference between multiple measurement results of the same load and the absolute value of the maximum allowable error specified in the calibration procedures.

[0089] An electronic scale calibration method, the above-mentioned electronic scale automatic calibration device is characterized in that it also includes a discrimination threshold calibration, and the discrimination threshold calibration includes the following steps:

[0090] Determine the mass of the tray, the mass of the flickering weight and the mass of the weight string according to the range of the electronic scale, and determine the mass of the three identification threshold loads according to the range of the electronic scale;

[0091] The electronic scale is placed on the weighing platform, and the first vertical driving mechanism drives the electronic scale to move upward to the calibration area through the weighing platform;

[0092] The second vertical driving mechanism drives the tray to move downward through the main flange plate until it contacts the weighing surface of the electronic scale;

[0093] The tray drive drives the tray tooling to move downward until the electronic scale carries the mass of the tray, and the zeroing drive drives the zeroing weight to move downward onto the tray, so that the electronic scale carries the mass of the zeroing weight at the same time. At this time, the electronic scale carries the minimum identification threshold load mass;

[0094] Multiple flicker weight mechanisms place multiple flicker weights corresponding to the electronic scale graduation value on the tray through flicker drive, and record the value I displayed on the electronic scale 1c ;

[0095] The multiple flicker weight mechanisms drive the flicker weights upward through the flicker drive so that the flicker weights are separated from the tray one by one until the value displayed on the electronic scale decreases by one division value, and the value displayed on the electronic scale at this time is recorded. c1 -d;

[0096] The identification threshold driver places the identification threshold weight on the tray through the identification threshold tooling so that the electronic scale bears the mass of the identification threshold weight and records the value I displayed on the electronic scale at this time. c1 ;

[0097] The identification threshold drive drives the identification threshold weight to move upward until the identification threshold weight is separated from the tray;

[0098] The first vertical driving mechanism drives the electronic scale to move upward through the weighing platform so that the weight string passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism drives the total flange plate and the electronic scale to move upward synchronously, so that the electronic scale gradually carries the mass of the weight string until the total mass carried by the electronic scale reaches the median identification threshold load mass; multiple flickering weight mechanisms place multiple flickering weights corresponding to the mass and the electronic scale graduation value on the tray through flickering driving, and record the value I displayed on the electronic scale 2c ;

[0099] The multiple flicker weight mechanisms drive the flicker weights upward through the flicker drive so that the flicker weights are separated from the tray one by one until the value displayed on the electronic scale decreases by one division value, and the value displayed on the electronic scale at this time is recorded. c2 -d;

[0100] The identification threshold driver places the identification threshold weight on the tray through the identification threshold tooling so that the electronic scale bears the mass of the identification threshold weight and records the value I displayed on the electronic scale at this time. c2 ;

[0101] The identification threshold drive drives the identification threshold weight to move upward until the identification threshold weight is separated from the tray;

[0102] The first vertical driving mechanism mechanically drives the electronic scale to move upward through the weighing platform, and the second vertical driving mechanism drives the total flange plate and the electronic scale to move upward synchronously, so that the electronic scale continues to gradually carry the mass of the weight string until the total mass carried by the electronic scale reaches the maximum identification threshold load mass; multiple flickering weight mechanisms place multiple flickering weights corresponding to the mass and the electronic scale graduation value on the tray through flickering drive, and record the value I displayed on the electronic scale 3c ;

[0103] The multiple flicker weight mechanisms drive the flicker weights upward through the flicker drive so that the flicker weights are separated from the tray one by one until the value displayed on the electronic scale decreases by one division value, and the value displayed on the electronic scale at this time is recorded. c3 -d;

[0104] The identification threshold driver places the identification threshold weight on the tray through the identification threshold tooling so that the electronic scale bears the mass of the identification threshold weight and records the value I displayed on the electronic scale at this time. c3 ;

[0105] The identification threshold drive drives the identification threshold weight to move upward until the identification threshold weight is separated from the tray;

[0106] According to I cn =I nc +d Determine whether the electronic scale identification threshold test is qualified.

[0107] The beneficial effects of the present invention are:

[0108] 1. The present invention places an electronic scale on a carrying platform, implements the calibration of the electronic scale through a calibration unit in a calibration area, and simultaneously performs a tapping operation on an operating area of ​​the electronic scale through a tapping unit to implement the calibration of different functions of the electronic scale, thereby minimizing the intensity of manual operation. The installation position of the tapping mechanism can be adapted to electronic scales of different specifications, and the application range is wide and the working efficiency is high.

[0109] 2. The present invention can meet the requirement that the electronic scale cannot be empty during the calibration process through the tray. At the same time, the mass of the variable weight and the mass of the tray are determined according to the specifications of the electronic scale. The zero calibration of the electronic scale can be completed by using the sum of the mass of the variable weight and the mass of the tray. The operation is simple and the work efficiency is improved.

[0110] 3. The present invention can also realize loads of different masses when the electronic scale moves up and down through the weight string, and also meets the calibration requirements of the electronic scale under different load conditions during weighing calibration, taring weighing calibration, repeatability calibration and identification threshold calibration. It has a simple structure, meets the use requirements, reduces the frequency of changing the load weights corresponding to the load, and improves work efficiency.

[0111] 4. The present invention also drives the electronic scale to move in a plane through a planar driving mechanism to realize the eccentric load verification of the four corners and the middle position of the electronic scale. The operation is simple and convenient. At the same time, the first vertical driving mechanism is used to drive the electronic scale to move up and down to realize the up and down movement of the electronic scale to carry weight strings of different masses. The second vertical driving mechanism can drive the main flange plate to move up and down, so that when the electronic scale moves up and down, the main flange plate can drive the tray mechanism, the flashing weight mechanism, the taring weight mechanism and the identification threshold weight mechanism to move synchronously with the electronic scale, so that when carrying weight strings of different masses, the remaining load can be kept on the electronic scale or keep a distance from the electronic scale, avoiding errors in the verification process and improving the verification accuracy.

[0112] 5. The present invention utilizes the mass of the flickering weight, the mass of the offset weight, the mass of the tray and the mass of the weight string to realize different calibrations of electronic scales with different ranges under specified loads. It can realize the calibration of electronic scales with various ranges through a variety of matching methods. It has a wide range of applications and meets usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0113] Figure 1 This is a schematic diagram of the overall structure of the calibration box in Example 1 of the present invention;

[0114] Figure 2 Schematic diagram of the overall structure of the automatic calibration device for electronic scales in Example 1 of the present invention;

[0115] Figure 3Schematic diagram of the overall structure of the carrier platform in Embodiment 1 of the present invention;

[0116] Figure 4 Schematic diagram of the overall structure of the test unit in Example 1 of the present invention;

[0117] Figure 5 This is a schematic diagram of the installation of the tray mechanism in the verification unit in Example 1 of the present invention;

[0118] Figure 6 This is a schematic diagram of installing the flash weight mechanism in the verification unit in Example 1 of the present invention;

[0119] Figure 7 This is a schematic diagram of the overall structure of the weight string in Example 2 of the present invention;

[0120] Figure 8 This is a schematic diagram of installing the eccentric load weight mechanism in the calibration unit in Example 2 of the present invention;

[0121] Fig. 9 This is a schematic diagram of the installation of the zero-setting weight mechanism in the calibration unit in Example 2 of the present invention;

[0122] Fig.10 Schematic diagram of the installation of the taring weight mechanism in the calibration unit in Example 3 of the present invention;

[0123] Fig.11 It is a schematic diagram of installing the identification threshold weight mechanism in the verification unit in Example 4 of the present invention;

[0124] In the figure, 1-carrying platform; 1a-bottom platform; 1b-planar drive mechanism; 1c-first vertical drive mechanism; 1d-weighing platform; 1e-click unit; 1f-industrial camera; 2-calibration unit; 2a-second vertical drive mechanism; 2b-general flange plate; 2c-upper flange; 3-tray mechanism; 3a-tray; 3b-tray drive; 3c-tray tooling; 4-flash weight mechanism; 4a-flash weight; 4b-flash tooling ; 4c-flicker drive; 5-weight string; 6-eccentric load weight mechanism; 6a-eccentric load weight; 6b-eccentric load tooling; 6c-eccentric load drive; 7-zero weight mechanism; 7a-zero weight; 7b-zero tooling; 7c-zero drive; 8-peeling weight mechanism; 8a-peeling weight; 8b-peeling tooling; 8c-peeling drive; 9-identification threshold weight mechanism; 9a-identification threshold weight; 9b-identification threshold tooling; 9c-identification threshold drive. DETAILED DESCRIPTION

[0125] Example 1

[0126] The calibration of electronic scales is carried out in accordance with the requirements of JJG539-2016 Digital Indicating Scale Calibration Procedure. Whether the calibration is qualified and the selection of corresponding load according to the electronic scale range are all subject to the limitations of this procedure.

[0127] refer to Figure 1 and Figure 2 The present embodiment provides an automatic calibration device and a calibration method for an electronic scale. The automatic calibration device for an electronic scale includes a carrying area and a calibration area located above the carrying area. A carrying platform 1 for placing the electronic scale is provided in the carrying area. A tapping unit 1e for tapping the electronic scale operation area is provided on the carrying platform 1. A calibration unit 2 for calibrating the electronic scale is provided in the calibration area. Preferably, the carrying area and the calibration area are arranged in a calibration box, so that the calibration process avoids inaccurate calibration results caused by interference from external factors of the electronic scale. At the same time, the automatic calibration device for an electronic scale may also include an industrial camera 1f, which is arranged on the carrying platform 1 and is used to monitor whether the displayed value of the electronic scale changes. When a change in the displayed value of the electronic scale is detected, the displayed value of the electronic scale is recorded, and the recorded displayed value can be uploaded to obtain the calibration result.

[0128] The calibration box is provided with ventilation holes, protective doors and transparent observation windows, and also includes start and stop control buttons for controlling the stop of the electronic scale calibration, which is convenient for operation; the load-bearing area is opposite to the protective door, which is convenient for the operator to place the electronic scale on the load-bearing platform 1, and the click unit 1e is detachably connected to the load-bearing platform 1, which is convenient for placing the click unit 1e according to the specifications of the electronic scale, so that the click unit 1e can click the zero key and tare key on the electronic scale. The click unit 1e can be selected as 1, and the click position is controlled by a servo motor, or it can be selected as 2, and the corresponding function keys are clicked by the telescopic device; the calibration unit 2 is placed in the calibration area, and the calibration area is located above the load-bearing area, which is convenient for placing loads of different masses on the electronic scale placed on the load-bearing platform 1.

[0129] refer to Figure 3The load-bearing platform 1 includes a bottom platform 1a, a planar driving mechanism 1b, a first vertical driving mechanism 1c and a weighing platform 1d. The first vertical driving mechanism 1c is connected to the bottom platform 1a to drive the bottom platform 1a to reciprocate up and down. The first vertical driving mechanism 1c can be a lifting device arranged on the left and right sides of the calibration box. The lifting device realizes the up and down drive of the bottom platform 1a. The lifting device can be a ball screw structure; the weighing platform 1d is connected to the bottom platform 1a through the planar driving mechanism 1b. The planar driving mechanism 1b can be a horizontal left-right moving device and a horizontal front-back moving device. The horizontal left Both the right moving device and the horizontal front and rear moving device can be selected as ball screw structures to realize the movement of the opposing weighing platform 1d, so that the electronic scale, driven by the planar driving mechanism 1b, makes the upper left corner, lower left corner, lower right corner, upper right corner and the middle position of the weighing surface of the electronic scale face the calibration unit 2, which is convenient for overload calibration; the click unit 1e is located on the weighing platform 1d, and preferably the click unit 1e is slidingly connected, snap-connected or magnetically connected to the weighing platform 1d, and further preferably the click unit 1e is magnetically connected to the weighing platform 1d, so that the click unit 1e can be placed in the corresponding position according to the different specifications of the electronic scale.

[0130] refer to Figure 4 , the verification unit 2 includes a tray mechanism 3, a second vertical drive mechanism 2a, a total flange plate 2b, an upper flange plate 2c and a plurality of flash weight mechanisms 4;

[0131] Specifically, the second vertical driving mechanism 2a is located outside the total flange plate 2b and connected to the total flange plate 2b, preferably connected to the inner wall of the calibration box, and the second vertical driving mechanism 2a can also be selected as a ball screw structure, so that the second vertical driving mechanism 2a can drive the total flange plate 2b to move up and down, the total flange plate 2b is vertically connected to the second vertical driving mechanism 2a, and the total flange plate 2b is located above the weighing platform 1d;

[0132] refer to Figure 5The tray mechanism 3 includes a tray 3a, a tray drive 3b and a tray fixture 3c. The tray drive 3b is arranged on the general flange plate 2b, so that the telescopic end of the tray drive 3b is movably connected to the tray 3a located below the general flange plate 2b. The tray 3a is movably connected to the telescopic end of the tray drive 3b through the tray fixture 3c. Preferably, the tray fixture 3c is a connecting rod, which is composed of a cylindrical section and a truncated cone section. A connecting hole is opened on the tray 3a. The inner diameter of the connecting hole is larger than the outer diameter of the cylindrical section, and the inner diameter of the connecting hole is smaller than the maximum outer diameter of the truncated cone section, so that the tray 3a can be arranged on the connecting rod. In order to enable the tray 3a to be fully supported on the electronic scale, it is preferably provided at the bottom of the tray 3a. The supporting feet are arranged so that the tray 3a contacts the electronic scale and does not contact the connecting rod when the electronic scale pushes it upward, and the frustum section of the connecting rod is just located in the space formed by the supporting feet. At the same time, the tray drive 3b can also drive the tray 3a to move up and down through the connecting rod until it contacts or leaves the electronic scale, that is, it does not contact the electronic scale. In order to ensure the stability of the connecting rod, an upper flange 2c is arranged between the tray 3a and the main flange plate 2b. The upper flange 2c is connected to the main flange plate 2b by bolts, and the connecting rod can pass through the upper flange 2c and move up and down on the upper flange 2c; the tray 3a is located above the weighing platform 1d, so that the tray 3a can contact the electronic scale on the weighing platform 1d.

[0133] refer to Figure 6The flash-change weight mechanism 4 is located above the tray 3a. The flash-change weight mechanism 4 includes a flash-change weight 4a, a flash-change tooling 4b and a flash-change drive 4c which are arranged in sequence from bottom to top. The fixed end of the flash-change drive 4c is connected to the upper flange 2c, and the output end is connected to the flash-change tooling 4b. The flash-change drive 4c is vertically arranged so that the flash-change drive 4c drives the flash-change weight 4a to move up and down through the flash-change tooling 4b. In order to fix the flash-change drive 4c, a lower flange plate is preferably arranged between the upper flange 2c and the tray 3a. The lower flange plate is connected to the upper flange 2c and the main flange plate 2b by bolts, so that the flash-change drive 4c passes through the lower flange plate and is connected to the flash-change tooling 4b. The flash-change tooling 4b and the flash-change weight 4a can be arranged at upper and lower intervals. The flash-change weight 4a can be placed on the tray 3a and then moved on the flash-change tooling 4 by a snap-on or hook-on method. When b continues to move downward, the flickering weight 4a is not in contact with the flickering tooling 4b, so that the electronic scale carries the mass of the flickering weight 4a but does not include the mass of the flickering tooling 4b and the force exerted by the flickering tooling 4b on the flickering weight 4a, thereby ensuring the accuracy of the calibration; in order to reduce the number of flickering weight mechanisms 4, it is preferred that each flickering tooling 4b is sequentially connected with 2 or 3 flickering weights 4a, and further preferably 2, so that when the flickering weight 4a at the lowest end is placed on the electronic scale, as the flickering drive 4c continues to extend downward, the two flickering weights 4a are not in contact. At this time, the electronic scale carries the mass of the flickering weight 4a at the lowest end, and then the flickering weight 4a at the top contacts the flickering weight 4a at the bottom and does not contact the flickering tooling 4b. At this time, the electronic scale carries the mass of two flickering weights 4a, thereby realizing that two flickering weights 4a are loaded on the electronic scale.

[0134] Preferably, there are multiple flashing weight mechanisms 4, and multiple flashing weight mechanisms 4 are arranged around the axis of the tray 3a. The preferred number is 16, with 2 flashing weight mechanisms 4 arranged on the left and right sides respectively, and 12 flashing weight mechanisms 4 arranged around the axis of the tray 3a. Each flashing weight mechanism 4 is located above the tray 3a.

[0135] Working principle:

[0136] An automatic calibration method for an electronic scale, using the above-mentioned automatic calibration device for an electronic scale to perform zero calibration, comprises the following steps:

[0137] Determine the mass of the tray 3a and the mass of the flicker weight 4a in the verification unit 2 according to the range of the electronic scale;

[0138] The electronic scale is placed on the weighing platform 1d, and the first vertical driving mechanism 1c drives the weighing platform 1d to move upward to the calibration area;

[0139] The second vertical driving mechanism 2a drives the tray 3a to move downwards through the main flange plate 2b until it contacts the weighing surface of the electronic scale;

[0140] The tray driver 3b drives the tray fixture 3c to move downward so that the electronic scale carries the mass L of the tray 3a and records the value I displayed on the electronic scale. 1 ;

[0141] The plurality of flicker weight mechanisms 4 place the flicker weights 4a on the tray 3a in sequence through the corresponding flicker drive 4c so that the electronic scale carries the mass △L of the corresponding number of flicker weights 4a 1 , until the value displayed on the electronic scale increases by one scale value d, and record the value displayed on the electronic scale at this time I 1 +d;

[0142] By E 0 =I 1 +0.5d-△L 1 -L calculates the integral error E of the zero calibration 0 According to the verification regulations, the integral error E 0 Determine whether the zero calibration result of the electronic scale is qualified;

[0143] The plurality of flicker weight mechanisms 4 drive the flicker weights 4a placed on the electronic scale to rise through the flicker drive 4c until all the flicker weights 4a are separated from the electronic scale.

[0144] Specifically, taking an electronic scale with a measuring range of 15kg as an example, according to regulations, a load of 50g is selected as the calibration zero point, so the tray 3a is selected as 50g. According to the requirement that the graduation value of the electronic scale with a measuring range of 15kg is 5g, the flash weight 4a is selected as 500mg to improve the calibration accuracy.

[0145] Place an electronic scale with a measuring range of 15kg on the weighing platform 1d, close the protective door, and start the automatic calibration device of the electronic scale by pressing the control button. Then the first vertical drive mechanism 1c drives the weighing platform 1d to move upward to the calibration area, so that the electronic scale is located under the tray 3a.

[0146] The second vertical driving mechanism 2a drives the tray mechanism 3 to move downward as a whole through the general flange plate 2b until the supporting feet at the bottom of the tray 3a contact the weighing surface of the electronic scale, so that the tray 3a is in stable contact with the electronic scale.

[0147] The tray driver 3b extends downward to drive the tray fixture 3c to move downward so that the tray 3a and the tray fixture 3c are not in contact. At this time, the electronic scale carries the mass L of the tray 3a. Then, after the value displayed on the electronic scale stabilizes, the value displayed on the electronic scale is recorded by the industrial camera 1f. 1 , which meets the requirement that subsequent calibrations after zero calibration cannot be performed with an empty scale.

[0148] The plurality of flicker weight mechanisms 4 sequentially place the flicker weights 4a on the tray 3a in turn through the corresponding flicker drive 4c, so that the electronic scale carries the mass of the corresponding number of flicker weights 4a, until the value displayed on the electronic scale changes, and the value displayed on the electronic scale is recorded after the displayed value stabilizes. 1 +d, by calculating E 0 =I 1 +0.5d-△L 1 -L calculates the integral error E of the zero calibration 0 , and then judge whether the zero calibration result of the electronic scale is qualified according to the requirements in the calibration procedures.

[0149] Usually, after completing the zero calibration, it is necessary to continue to complete other calibrations, so all the flicker weights 4a are subsequently taken back.

[0150] Example 2

[0151] refer to Figure 7 , which is different from the embodiment 1, the calibration unit in the automatic calibration device for electronic scales further includes a weight string 5, an offset weight mechanism 6 and a zeroing weight mechanism 7;

[0152] Specifically, the weight string 5 includes a plurality of weights which are serially connected from top to bottom and have the same mass and / or different masses, so that the electronic scale can contact and carry the mass of the weights in the weight string from bottom to top in sequence when gradually rising, thereby realizing different carrying masses of the electronic scale. For example, in order to make the electronic scale carry the mass of the bottom weight without carrying the mass of the second-to-last weight, so that the bottom weight can not contact the second-to-last weight, it is preferred to set a spacing between adjacent weights. In order to facilitate the control of the rising distance, it is further preferred that the spacing between adjacent weights in the weight string 5 is equal; the tray 3a, the main flange plate 2b and the upper flange plate 2c are all provided with weight string holes in the center, and the inner diameter of the weight string holes is larger than the outer diameter of any weight in the weight string 5, so that when the second vertical driving mechanism 2a drives the upper flange plate 2c and the tray 3a to move up and down through the main flange plate 2b, the weight string 5 can pass through the weight string hole without hindrance, and the weight string 5 is preferably arranged along the axis of the weight string hole, and the weight string 5 is suspended on the top of the calibration box, and the topmost weight is also movably connected to the suspension structure; at this time, all the flashing weight mechanisms 4 are arranged on the peripheral side of the weight string 5;

[0153] refer to Figure 8The eccentric load weight mechanism 6 includes an eccentric load weight 6a, an eccentric load fixture 6b and an eccentric load drive 6c. The eccentric load drive 6c is arranged in parallel with the flash drive 4c and is connected to the upper flange 2c. The fixed end of the eccentric load drive 6c is connected to the upper flange 2c, and the output end of the eccentric load drive 6c passes through the lower flange and is connected to the eccentric load fixture 6b. The eccentric load weight 6a is movably connected to the eccentric load fixture 6b, so that after the eccentric load weight 6a is placed on the electronic scale, the eccentric load fixture 6b will not contact the eccentric load weight 6a when the eccentric load drive 6c continues to extend, and will move with the electronic scale when the electronic scale moves left and right. Therefore, the eccentric load weight 6a needs to be detached from the eccentric load fixture 6b. Preferably, the eccentric load fixture 6b is a U-shaped structure and is arranged horizontally. The eccentric load weight 6a includes a weight body, a cylindrical section at the top of the weight body and a limiting ball at the top of the cylindrical section. The outer diameter of the limiting ball is larger than the slot of the U-shaped structure, and the outer diameter of the cylindrical section is smaller than the slot of the U-shaped structure. In the initial stage, the limiting ball contacts and engages with the slot of the U-shaped structure. When the weight body contacts the electronic scale, the overload drive 6c continues to drive downward, and the limiting ball and the cylindrical section are not in contact with the slot of the U-shaped structure. When the electronic scale moves along the opening direction of the U-shaped structure, the overload weight 6a is driven to separate from the overload tooling 6b, so that the overload weight 6a can move with the electronic scale; an overload hole is provided on the tray 3a, and the overload weight 6a is coaxially arranged with the overload hole. The overload hole is preferably arranged on the front and rear sides of the tray 3a, that is, the number of the overload weight mechanism 6 is preferably 2 and is relatively arranged on the front and rear sides of the upper flange 2c. At the same time, the overload hole can enable the overload weight 6a to be placed directly on the electronic scale.

[0154] refer to Fig. 9 The zeroing weight mechanism 7 includes a zeroing weight 7a, a zeroing fixture 7b and a zeroing drive 7c. The zeroing drive 7c is arranged in parallel with the flickering drive 4c, preferably on the left or right side of the upper flange 2c, and further preferably on the right side of the upper flange 2c; the fixed end of the zeroing drive 7c is connected to the upper flange 2c, the output end of the zeroing drive 7c is connected to the zeroing fixture 7b through the lower flange, the zeroing weight 7a is movably connected to the zeroing fixture 7b, the zeroing weight 7a is arranged opposite to the tray 3a, and the zeroing weight 7a is located above the tray 3a, so that the zeroing weight 7a falls on the tray 3a.

[0155] Working principle:

[0156] An automatic calibration method for an electronic scale, using the automatic calibration device for an electronic scale of this embodiment to perform an eccentric load calibration, comprises the following steps:

[0157] Determine the mass of the eccentric load weight 6a, the mass of the zero weight 7a and the mass of the weight string 5 according to the range of the electronic scale;

[0158] The electronic scale completes the zero calibration and obtains the zero calibration integral error E 0 ;

[0159] The eccentric load driver 6c places the eccentric load weight 6a on the weighing surface of the electronic scale through the eccentric load tool 6b so that the electronic scale bears the mass of the eccentric load weight 6a;

[0160] The tray driver 3b drives the tray fixture 3c to move upward until the tray 3a is separated from the electronic scale;

[0161] The weighing platform 1d drives the electronic scale to move through the planar driving mechanism 1b so that the calibration unit 2 is located at the detection point of the corresponding position of the electronic scale, and at the same time, the eccentric load weight 6a is separated from the eccentric load fixture 6b and moves synchronously with the electronic scale;

[0162] The first vertical driving mechanism 1c drives the electronic scale to move upward through the weighing platform 1d so that the weight string 5 passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism 2a drives the main flange plate 2b to move upward synchronously with the electronic scale until the first vertical driving mechanism 1c stops when the electronic scale bears the mass of the weight string 5.

[0163] The tray driver 3b drives the tray fixture 3c to move downward until the electronic scale carries the mass L of the tray 3a;

[0164] The zeroing drive 7c drives the zeroing weight 7a to move downward onto the tray 3a, so that the electronic scale carries the mass of the zeroing weight 7a, and records the value I displayed on the electronic scale. 2 ;

[0165] The plurality of flicker weight mechanisms 4 place the flicker weights 4a on the tray 3a in sequence through the corresponding flicker drive 4c so that the electronic scale carries the mass △L of the corresponding number of flicker weights 4a 2 , until the value displayed on the electronic scale increases by one scale value d, and record the value displayed on the electronic scale at this time I 2 +d;

[0166] By E c =EE 0 Calculate the correction error E of each detection point in the eccentric load verification c , where E 0 =I 1 +0.5d-△L 1 -L, E = I 2 +0.5d-△L 2 -L;

[0167] Compare the correction error obtained by measuring the same load at different positions of the electronic scale with the absolute value of the maximum allowable error specified in the verification regulations to determine whether the electronic scale eccentric load verification result is qualified;

[0168] The weighing platform 1d drives the electronic scale to move to the initial position through the planar driving mechanism 1b;

[0169] The multiple flicker weight mechanisms 4 drive the flicker weights 4a placed on the electronic scale to rise through the flicker drive 4c until all the flicker weights 4a are separated from the electronic scale;

[0170] The eccentric load driving 6c drives the eccentric load weight 6a to move upward and separate from the tray;

[0171] The zero setting drive 7c drives the zero setting weight 7a to move upward and separate from the tray 3a;

[0172] The tray driver 3b drives the tray 3a to move upward so that the tray 3a is separated from the electronic scale;

[0173] The first vertical driving mechanism 1c drives the electronic scale to move downward through the weighing platform 1d so that the weight string 5 is separated from the weighing surface of the electronic scale;

[0174] Specifically, taking an electronic scale with a range of 15kg as an example, the off-load calibration generally selects 1 / 3 of the maximum range of the electronic scale. According to regulations, a load of 5kg needs to be selected as the off-load load. At the same time, in order to achieve zero calibration of the 15kg range electronic scale, the tray 3a is 50g, the flash weight 4a is 500mg, the off-load weight is 100g, the zero weight is 50g, and the total mass of the weight string 5 is 4.8kg.

[0175] After the electronic scale completes the zero calibration, the zero calibration rounding error E is obtained. 0 ;

[0176] Then, an offset load drive 6c drives downward through the offset load tooling 6b to place the offset load weight 6a on the weighing surface of the electronic scale, so that the electronic scale bears the mass of the offset load weight 6a. At this time, the tray 3a is placed on the electronic scale to prevent the electronic scale from being empty in subsequent steps.

[0177] The tray drive 3b contracts upwards and enables the tray 3a to leave the weighing surface of the electronic scale through the tray fixture 3c, thereby preventing the electronic scale from colliding with the tray 3a when moving.

[0178] The weighing platform 1d drives the electronic scale to move through the planar driving mechanism 1b so that the calibration unit 2 is located at the upper left corner, lower left corner, lower right corner, upper right corner or the middle position of the electronic scale, and the eccentric load calibration of the upper left corner, lower left corner, lower right corner, upper right corner and the middle position of the electronic scale is started. At the same time, the eccentric load weight 6a is separated from the eccentric load fixture 6b when the electronic scale moves and moves together with the electronic scale. In order to prevent the eccentric load weight 6a from contacting the corresponding eccentric load fixture 6b when following the movement of the electronic scale, resulting in a change of position and inability to complete the clamping and recovery of the eccentric load weight 6a, it is preferred that when the eccentric load weight 6a in front is placed on the electronic scale, the electronic scale first moves forward to separate the eccentric load weight 6a from the eccentric load fixture 6b, and then the electronic scale moves to the left to start the eccentric load calibration of the upper right corner of the electronic scale, or The electronic scale moves to the right so that the calibration unit 2 is located in the upper left corner of the electronic scale and starts to perform eccentric load calibration on the upper left corner of the electronic scale; after completing the eccentric load calibration of the upper left and upper right corners of the electronic scale, the electronic scale moves to the initial position so that the eccentric load weight 6a is mounted in the eccentric load fixture 6b, and then the eccentric load drive 6c drives upward to recover the eccentric load weight 6a, and when the eccentric load weight is separated from the electronic scale, the eccentric load weight located at the rear is placed on the electronic scale, and after the eccentric load weight 6a in the front is recovered, the electronic scale moves backward so that the eccentric load weight 6a at the rear is separated from the corresponding eccentric load fixture 6b, and then the electronic scale moves left and right to complete the eccentric load calibration of the lower left and lower right corners of the electronic scale, and when performing eccentric load calibration on the center position of the electronic scale, it can start when the front eccentric load weight 6a is completely placed on the electronic scale.

[0179] The first vertical driving mechanism 1c drives the electronic scale to move upward through the weighing platform 1d so that the weight string 5 passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism 2a drives the main flange plate 2b to move upward synchronously with the electronic scale to avoid contact between the electronic scale and the tray 3a. When the electronic scale carries the weight of the weight string 5, the first vertical driving mechanism 1c stops. At this time, the mass on the electronic scale is 100g+4.8kg=4.9kg.

[0180] In order to avoid excessive flickering weights 4a to supplement the remaining load, the tray driver 3b drives the tray tooling 3c to move downward again until the electronic scale carries the mass L of the tray 3a. At this time, the load of the electronic scale is 4.9kg+50g=4.95kg. Similarly, in order to avoid excessive flickering weights 4a to supplement the remaining load, the zeroing driver 7c is selected to drive the zeroing weight 7a to move downward onto the tray 3a, so that the electronic scale carries the mass of the zeroing weight 7a. At this time, the load of the electronic scale is 4.95kg+50g=5kg. After the value displayed on the electronic scale stabilizes, the value displayed on the electronic scale is recorded. 2 ;

[0181] The plurality of flicker weight mechanisms 4 sequentially place the flicker weights 4a on the tray 3a in sequence through the corresponding flicker drive 4c so that the electronic scale carries the mass △L of the corresponding number of flicker weights 4a 2, until the value displayed on the electronic scale changes, record the value displayed on the electronic scale at this time I 2 +d;

[0182] By E c =EE 0 Calculate the correction error E of each detection point in the eccentric load verification c , where E 0 =I 1 +0.5d-△L 1 -L, E = I 2 +0.5d-△L 2 -L, requirements of the verification procedure, judgment E c Whether it is less than the maximum allowable deviation absolute value of the load point can be judged whether the verification result meets the requirements;

[0183] This cycle is repeated until the eccentric load test of the electronic scale at the upper left corner, lower left corner, lower right corner, upper right corner and middle position is completed.

[0184] After the eccentric load test is completed, the weight string 5, the eccentric load weight 6a, the zero weight 7c and the tray 3a need to be restored to their initial positions.

[0185] An automatic calibration method for an electronic scale, using the automatic calibration device for an electronic scale of this embodiment to perform weighing calibration, comprises the following steps:

[0186] The electronic scale completes the eccentric load verification;

[0187] The second vertical driving mechanism 2a drives the tray 3a to move downwards through the main flange plate 2b until it contacts the weighing surface of the electronic scale;

[0188] The tray driver 3b drives the tray fixture 3c to move downward until the electronic scale carries the mass of the tray 3a, and the total mass carried by the electronic scale reaches the mass at the load point corresponding to the lift indication error, and the value displayed by the electronic scale is recorded;

[0189] The zeroing drive 7c drives the zeroing weight 7a to move downward onto the tray 3a, so that the electronic scale carries the mass of the zeroing weight 7a, and the total mass carried by the electronic scale reaches the mass of the corresponding lift indication error load point, and the value displayed by the electronic scale is recorded;

[0190] The eccentric load driver 6c places the eccentric load weight 6a on the weighing surface of the electronic scale through the eccentric load tool 6b so that the electronic scale bears the mass of the eccentric load weight 6a;

[0191] The first vertical driving mechanism 1c drives the electronic scale to move upward through the weighing platform 1d so that the weight string 5 passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism 2a drives the main flange plate 2b to move upward synchronously with the electronic scale, so that the electronic scale gradually carries the mass of the weight string 5 until the total mass carried by the electronic scale reaches the mass of the corresponding lift indication error load point. The first vertical driving mechanism 1c stops, and the value displayed by the electronic scale at this time is recorded.

[0192] The first vertical driving mechanism 1c drives the electronic scale to continue to move upward through the weighing platform 1d, and at the same time, the second vertical driving mechanism 2a drives the main flange plate 2b and the electronic scale to move upward synchronously, so that the electronic scale sequentially carries the lift indication error load point and records the electronic scale display value at the corresponding time, completing the weighing of the corresponding load point;

[0193] The first vertical driving mechanism 1c drives the electronic scale to move downward through the weighing platform 1d, and at the same time, the second vertical driving mechanism 2a drives the main flange plate 2b and the electronic scale to move downward synchronously, so that the electronic scale sequentially carries the return indication error load point and records the electronic scale display value at the corresponding time, until the weight string 5 is separated from the load-bearing end surface of the electronic scale;

[0194] The eccentric load drive 6c drives the eccentric load weight 6a to move upward and separate from the tray, and the value displayed on the electronic scale is recorded at this time, completing the weighing of all return indication error load points.

[0195] Specifically, in order to enable the automatic calibration device of the electronic scale of this embodiment to complete the zero calibration and the off-center load calibration and the weighing calibration at the same time, the masses of the tray 3a, the zero weight 7a, the off-center load weight 6a and the flicker weight 4a do not change. Taking the electronic scale with a measuring range of 15kg as an example, the masses of the lift indication error load points that need to be placed in sequence according to regulations are 50g, 100g, 2.5kg, 7.5kg, 10kg and 15kg, and the masses of the return indication error load points that need to be placed in sequence are 10kg, 7.5kg, 2.5kg and 100g, so the weight string 5 is selected as 7 weights, and the weights from bottom to top are 2.3kg, 2.5kg, 2.5kg, 2.5kg and 5kg.

[0196] The electronic scale completes the eccentric load verification;

[0197] The second vertical driving mechanism 2a drives the tray mechanism 3 to move downward as a whole through the general flange plate 2b until the supporting feet at the bottom of the tray 3a contact the weighing surface of the electronic scale, so that the tray 3a is in stable contact with the electronic scale.

[0198] The pallet drive 3b extends downward, driving the pallet tooling 3c to move downward so that the pallet 3a is not in contact with the pallet tooling 3c. At this time, the electronic scale bears the 50g mass of the pallet 3a. After the value displayed on the electronic scale stabilizes, the displayed value is recorded through the industrial camera 1f to complete a lift indication error calibration.

[0199] In order to avoid supplementing the remaining load through excessive flickering weights 4a, the zeroing drive 7c is selected to drive the zeroing weight 7a to move downward to the tray 3a, so that the electronic scale carries the mass of the zeroing weight 7a. At this time, the load of the electronic scale is 50g+50g=100g. After the displayed value of the electronic scale stabilizes, the displayed value is recorded by the industrial camera 1f to complete a lift indication error calibration.

[0200] Then, an offset load driver 6c drives downward to place the offset load weight 6a on the weighing surface of the electronic scale through the offset load tooling 6b, so that the electronic scale bears the mass of the offset load weight 6a. At this time, the load of the electronic scale is 100g+100g=200g.

[0201] In order to make the load of the electronic scale 2.5kg, the mass of the bottom weight in the weight string 5 is preferably 2.3kg, so the first vertical drive mechanism 1c drives the electronic scale to move upward through the weighing platform 1d so that the weight string 5 passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical drive mechanism 2a drives the main flange plate 2b and the electronic scale to move upward synchronously. When the electronic scale bears the mass of the bottom weight in the weight string 5, the first vertical drive mechanism 1c stops. At this time, the load on the electronic scale is 200g+2.3kg=2.5kg. After the value displayed on the electronic scale stabilizes, it is recorded through the industrial camera 1f to complete a lift indication error calibration.

[0202] Then, the first vertical drive mechanism 1c continues to rise, and the second vertical drive mechanism rises synchronously. At this time, the electronic scale contacts the second-to-last weight with a mass of 2.5 kg and completely places it on the electronic scale. At this time, the load of the electronic scale is 2.5 kg + 2.5 kg = 5 kg, which still does not meet the 7.5 kg load requirement.

[0203] Then, the first vertical drive mechanism 1c continues to rise, and the second vertical drive mechanism rises synchronously. At this time, the electronic scale contacts the third-to-last weight with a mass of 2.5kg and places it completely on the electronic scale. At this time, the load of the electronic scale is 5kg+2.5kg=7.5kg, which meets the 7.5kg load requirement. After the value displayed on the electronic scale stabilizes, it is recorded to complete a lift indication error calibration.

[0204] Then, the first vertical drive mechanism 1c continues to rise, and the second vertical drive mechanism rises synchronously. At this time, the electronic scale contacts the fourth-to-last weight with a mass of 2.5kg and places it completely on the electronic scale. At this time, the load of the electronic scale is 7.5kg+2.5kg=10kg, which meets the requirement of 10kg load. After the value displayed on the electronic scale stabilizes, it is recorded to complete a lift indication error calibration.

[0205] Then, the first vertical drive mechanism 1c continues to rise, and the second vertical drive mechanism rises synchronously. At this time, the electronic scale contacts the fifth-to-last weight with a mass of 5kg and places it completely on the electronic scale. At this time, the load of the electronic scale is 10kg+5kg=15kg, which meets the requirement of 15kg load. After the value displayed on the electronic scale stabilizes, it is recorded to complete the lift indication error verification.

[0206] Subsequently, the first vertical drive mechanism 1c begins to descend, and the second vertical drive mechanism descends synchronously. At this time, the electronic scale is completely separated from the fifth-to-last weight with a mass of 5kg. At this time, the load of the electronic scale is 15kg-5kg=10kg, which meets the requirement of 10kg load. After the value displayed on the electronic scale stabilizes, it is recorded by the industrial camera 1f to complete a return indication error calibration.

[0207] Then, the first vertical drive mechanism 1c begins to descend, and the second vertical drive mechanism descends synchronously. At this time, the electronic scale is completely separated from the fourth-to-last weight with a mass of 2.5kg. At this time, the load of the electronic scale is 10kg-2.5kg=7.5kg, which meets the 7.5kg load requirement. After the value displayed on the electronic scale stabilizes, it is recorded by the industrial camera 1f to complete a return indication error calibration.

[0208] Then, the first vertical drive mechanism 1c begins to descend, and the second vertical drive mechanism descends synchronously. At this time, the electronic scale is completely separated from the fourth-to-last weight with a mass of 2.5kg. At this time, the load of the electronic scale is 10kg-2.5kg=7.5kg, which meets the 7.5kg load requirement. After the value displayed on the electronic scale stabilizes, it is recorded by the industrial camera 1f to complete a return indication error calibration.

[0209] Then, the first vertical drive mechanism 1c begins to descend, and the second vertical drive mechanism descends synchronously. At this time, the electronic scale is completely separated from the third-to-last weight with a mass of 2.5kg. At this time, the load of the electronic scale is 7.5kg-2.5kg=5kg, which meets the 5kg load requirement. After the value displayed on the electronic scale stabilizes, it is recorded by the industrial camera 1f to complete a return indication error calibration.

[0210] Then, the first vertical drive mechanism 1c begins to descend, and the second vertical drive mechanism descends synchronously. At this time, the electronic scale is completely separated from the second-to-last weight with a mass of 2.5kg. At this time, the load of the electronic scale is 5kg-2.5kg=2.5kg, which meets the 2.5kg load requirement. After the value displayed on the electronic scale stabilizes, it is recorded by the industrial camera 1f to complete a return indication error calibration.

[0211] Then, the first vertical drive mechanism 1c starts to descend, and the second vertical drive mechanism descends synchronously. At this time, the electronic scale is completely separated from the second-to-last weight with a mass of 2.3kg. At this time, the load of the electronic scale is 2.5kg-2.3kg=200g, which does not meet the 100g load requirement.

[0212] Finally, the eccentric load drive 6c drives the eccentric load weight 6a to separate from the electronic scale through the eccentric load tooling 6b. At this time, the load of the electronic scale is 200g-100g=100g, which meets the requirement of 100g load. After the value displayed on the electronic scale stabilizes, it is recorded through the industrial camera 1f to complete the return indication error verification and finally complete the weighing verification.

[0213] Example 3

[0214] refer to Fig.10 , which is different from the embodiment 2, the calibration unit in the automatic calibration device for electronic scales further includes a taring weight mechanism 8;

[0215] The tare weight mechanism 8 includes a tare weight 8a, a tare tool 8b and a tare drive 8c. The tare weight mechanism 8 is arranged on the peripheral side of the tray 3a. The fixed end of the tare drive 8c is connected to the main flange plate 2b. The other end of the tare drive 8c is movably connected to the tare weight 8a through the tare tool 8b, so that when the tare weight contacts the electronic scale and the tare drive 8c continues to extend downward, the tare weight 8a is not in contact with the tare tool 8b, so that the electronic scale can bear the mass of the tare weight 8a. The number of tare weight mechanisms 8 can be selected from 1 to 4, preferably 4.

[0216] Working principle:

[0217] Tare and zero setting:

[0218] The electronic scale completes weighing verification;

[0219] Determine the mass of the tared weight 8a according to the range of the electronic scale;

[0220] The tare drive 8c drives the tare weight 8a to move downward through the tare tool 8b so that the electronic scale carries the mass of the tare weight 8a;

[0221] Press the tare button in the electronic scale operation area through the pressing unit 1e;

[0222] Weighing after peeling:

[0223] The second vertical driving mechanism 2a drives the tray 3a to move downwards through the main flange plate 2b until it contacts the weighing surface of the electronic scale;

[0224] The tray driver 3b drives the tray fixture 3c to move downward until the electronic scale carries the mass of the tray 3a, and the zeroing driver 7c drives the zeroing weight 7a to move downward onto the tray 3a, so that the electronic scale carries the mass of the zeroing weight 7a. At this time, the load carried by the electronic scale during taring is L b1 , record the value I displayed on the electronic scale at this time b1 , complete one lift measurement load bearing;

[0225] The plurality of flicker weight mechanisms 4 sequentially place the flicker weights 4a on the tray 3a in sequence through the corresponding flicker drive 4c so that the electronic scale carries the mass △L of the corresponding number of flicker weights 4a b1 , until the value displayed on the electronic scale increases by one scale value d, and record the value displayed on the electronic scale at this time I b1 +d, then the flicker driver 4c drives all the flicker weights 4a to separate from the electronic scale, and through E b1 =I b1 +0.5d-△L b1 -L b1 Calculate the weighing error of the measured load;

[0226] The eccentric load driver 6c places the eccentric load weight 6a on the weighing surface of the electronic scale through the eccentric load tool 6b so that the electronic scale bears the mass of the eccentric load weight 6a;

[0227] The first vertical driving mechanism 1c drives the electronic scale to move upward through the weighing platform 1d so that the weight string 5 passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism 2a drives the main flange plate 2b to move upward synchronously with the electronic scale, so that the mass of the weight string 5 is gradually loaded on the weighing surface of the electronic scale. Whenever the load of the electronic scale reaches a lift measurement load L bn Then, record the displayed value I of the electronic scale at the corresponding time bn Then, multiple flicker weight mechanisms 4 drive the corresponding flicker weights 4c to move the mass △L bn The flash weights 4a are placed on the tray 3a in sequence until the electronic scale displays an increase in a scale value, and the value I displayed on the electronic scale is recorded. bn +d, the flash drive 4c drives all the flash weights (4a) to separate from the electronic scale, and then bn =I bn +0.5d-△L bn -L bn Calculate the weighing error of the measured load, n = (1, 2, ..., n) until the corresponding lift measurement load is loaded;

[0228] The first vertical drive mechanism 1c drives the electronic scale to move downward through the weighing platform 1d, and at the same time, the second vertical drive mechanism 2a drives the main flange plate 2b and the electronic scale to move downward synchronously, so that the weight string 5 gradually leaves the weighing surface of the electronic scale. Whenever the electronic scale reaches a return measurement load L Bn Then, record the displayed value I of the electronic scale at the corresponding time Bn Then, the multiple flicker weight mechanisms 4 place the flicker weights 4a on the tray 3a in sequence through the corresponding flicker drive 4c until the electronic scale displays an increase in a scale value, and record the value I displayed on the electronic scale at this time. Bn +d, the flash driver 4c drives all the flash weights 4a to separate from the electronic scale, and then Bn =I Bn +0.5d-△L Bn -L Bn Calculate the weighing error of the measured load until the weight string 5 is separated from the weighing surface of the electronic scale, completing the return measurement load bearing;

[0229] According to the verification procedure, the weighing error E bn and E Bn Determine whether the electronic scale zero calibration is qualified;

[0230] The eccentric load driving 6c drives the eccentric load weight 6a to move upward and separate from the tray;

[0231] The tray driver 3b drives the tray 3a to move upward so that the tray 3a is separated from the electronic scale;

[0232] The tare drive 8c drives the tare weight 8a to move upward and separate from the electronic scale;

[0233] Press the zero reset button in the electronic scale operation area by pressing unit 1e.

[0234] Specifically, taking an electronic scale with a measuring range of 15kg as an example, the tare weight to be deducted according to the regulations needs to be measured at 1 / 3 to 2 / 3 of the maximum measuring range. The error calibration takes 5kg, that is, the tare load to be placed is 5kg. At the same time, in order to ensure that the automatic calibration device of the electronic scale provided in this embodiment can complete the zero calibration, off-center load calibration and weighing calibration, the mass of the tray 3a, the mass of the zero weight 7a, the mass of the flash weight 4a, the mass of the off-center load weight 6a and the mass of each weight in the weight string 5 remain unchanged, and the mass of each tare weight is selected to be 2.5kg.

[0235] First, perform taring and zeroing:

[0236] The first vertical drive mechanism 1c drives the weighing platform 1d to move upward to the calibration area, so that the electronic scale is located below the tray 3a. Usually, the electronic scale is centered at this step during the calibration, so that the tared weight is located directly above the electronic scale.

[0237] The two tare drives 8c drive the tare weight 8a to move downward through the tare tooling 8b so that the electronic scale carries the mass of the tare weight 8a. At this time, the mass carried by the electronic scale is 2*2.5kg=5kg.

[0238] By pressing the tare button in the electronic scale operation area through the pressing unit 1e, the tare and zero setting operation of the electronic scale is completed.

[0239] Then enter the field to remove the skin and weigh:

[0240] For an electronic scale with a range of 15kg, the lift measurement load L needs to be placed in sequence to complete the taring weighing verification. bn Loads of 100g, 2.5kg, 5kg, 7.5kg, and 10kg are placed on the electronic scale, and then the return measurement load L is placed. Bn Loads of 7.5kg, 5kg and 2.5kg were placed on the electronic scale.

[0241] Then the second vertical drive mechanism 2a drives the tray 3a to move downward as a whole through the main flange plate 2b until it contacts the sub-scale weighing surface, and then the tray drive 3b drives the tray tooling 3c to move downward until the electronic scale bears the mass of the tray 3a, completing the placement of the 50g load.

[0242] The zeroing drive 7c drives the zeroing weight 7a to move downward onto the tray 3a, so that the electronic scale carries the mass of the zeroing weight 7a, completing the placement of the load of 50g+50g=100g. At this time, the load carried by the electronic scale during taring weighing is L b1 , record the value I displayed on the electronic scale at this time b1 .

[0243] Next, the plurality of flicker weight mechanisms 4 sequentially place the flicker weights 4a on the tray 3a in sequence through the corresponding flicker drive 4c so that the electronic scale carries the mass △L of the corresponding number of flicker weights 4a. b1 That is, each flicker weight mechanism 4 is driven by the corresponding flicker driver 4c, and all the flicker weights 4a on each flicker weight mechanism 4 are placed on the electronic scale in sequence until the displayed value of the electronic scale increases by a graduation value d, and the value displayed on the electronic scale at this time is recorded by the industrial camera 1f. b1 +d, through E b1 =I b1 +0.5d-△L b1 -L b1 Calculate the weighing error of the measured load;

[0244] Then, all the flashing weights 4a of the flashing weight mechanism 4 are retracted to complete the tared weighing verification of the 100g load.

[0245] When taring and weighing 2.5kg, 5kg, 7.5kg and 0kg, the weights in the weight string 5 are needed, so the first vertical drive mechanism 1c then drives the electronic scale to move upward through the weighing platform 1d so that the weight string 5 passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical drive mechanism 2a drives the main flange plate 2b and the electronic scale to move upward synchronously. When the electronic scale bears the mass of the bottom weight in the weight string 5, the first vertical drive mechanism 1c stops. At this time, the electronic scale carries a load of 100g+2.3kg=2.4kg, which does not meet the 2.5kg load requirement.

[0246] Therefore, the eccentric load driver 6c places the eccentric load weight 6a on the weighing surface of the electronic scale through the eccentric load fixture 6b so that the electronic scale carries the mass of the eccentric load weight 6a. At this time, the load carried by the electronic scale is 2.4kg+100g=2.5kg, satisfying L bn =2.5kg load requirement, record the value displayed on the electronic scale through the industrial camera 1f bn .

[0247] Similarly, the plurality of flicker weight mechanisms 4 sequentially place the flicker weights 4a on the tray 3a in sequence through the corresponding flicker drive 4c so that the electronic scale carries the mass △L of the corresponding number of flicker weights 4a bn That is, each flicker weight mechanism 4 is driven by the corresponding flicker driver 4c, and all the flicker weights 4a on each flicker weight mechanism 4 are placed on the electronic scale in sequence until the displayed value of the electronic scale changes. At this time, after the displayed value of the electronic scale stabilizes, the industrial camera 1f records it. bn +d, through E bn =I bn +0.5d-△L bn -L bn Calculate the weighing error of the measured load, n = (1, 2, ..., n) to complete the tared weighing verification of the 2.5 kg load, and then withdraw all the flicker weights 4a.

[0248] The cycle continues like this. For the tared weighing and calibration of the electronic scale with a load of 5kg, it can be achieved by adding the second to last weight in the weight string 5, 2.5kg+2.5kg=5kg. For the tared weighing and calibration of the electronic scale with a load of 7.5kg, it can be achieved by adding the third to last weight in the weight string 5, 5kg+2.5kg=7.5kg. For the tared weighing and calibration of the electronic scale with a load of 10, it can be achieved by adding the fourth to last weight in the weight string 5, 7.5kg+2.5kg=10kg.

[0249] Subsequently, the first vertical drive mechanism 1c drives the electronic scale to move downward through the weighing platform 1d, and at the same time, the second vertical drive mechanism 2a drives the main flange plate 2b and the electronic scale to move downward synchronously, so that the weight string 5 gradually leaves the weighing surface of the electronic scale. Whenever the electronic scale reaches a return measurement load L Bn Then, the corresponding values ​​are 7.5kg, 5kg and 2.5kg, and the displayed value of the electronic scale at the corresponding time is recorded. Bn Then, the multiple flicker weight mechanisms 4 place the flicker weights 4a on the tray 3a in sequence through the corresponding flicker drive 4c until the electronic scale displays an increase in a scale value, and record the value I displayed on the electronic scale at this time. Bn +d, the flash driver 4c drives all the flash weights 4a to separate from the electronic scale, and then Bn =I Bn +0.5d-△L Bn -L Bn Calculate the weighing error of the measured load until the weight string 5 is separated from the weighing surface of the electronic scale, completing the return measurement load bearing;

[0250] According to the verification procedure, the weighing error E bn and E Bn Determine whether the electronic scale zero calibration is qualified;

[0251] Finally, the eccentric load weight 6a, the tray 3a and the tared weight 8a are restored to their initial positions;

[0252] After completing the above-mentioned tared weighing calibration, press the zero button in the electronic scale operation area by pressing unit 1e to complete the tared weighing calibration of the 15kg range electronic scale.

[0253] An automatic calibration method for an electronic scale, using the automatic calibration device for an electronic scale of the present embodiment to perform repeatability calibration, comprises the following steps:

[0254] Determine the mass of the weight string 5 according to the range of the electronic scale;

[0255] The electronic scale is placed on the weighing platform 1d, and the first vertical driving mechanism 1c drives the electronic scale to move upward to the calibration area through the weighing platform 1d;

[0256] The first vertical driving mechanism 1c drives the electronic scale to move upward through the weighing platform 1d so that the weight string 5 passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism 2a drives the main flange plate 2b to move upward synchronously with the electronic scale. When the electronic scale bears the mass of the weight string 5, the first vertical driving mechanism 1c stops and records the value displayed on the electronic scale.

[0257] Press the zero reset button in the electronic scale operation area by pressing unit 1e;

[0258] Repeat the following steps multiple times:

[0259] The first vertical driving mechanism 1c drives the electronic scale to move downward through the weighing platform 1d, and the second vertical driving mechanism 2a drives the main flange plate 2b to move downward synchronously with the electronic scale until the weight string 5 is separated from the electronic scale;

[0260] The first vertical driving mechanism 1c drives the electronic scale to move upward through the weighing platform 1d so that the weight string 5 passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism 2a drives the main flange plate 2b to move upward synchronously with the electronic scale. When the electronic scale bears the mass of the weight string 5, the first vertical driving mechanism 1c stops and records the value displayed on the electronic scale.

[0261] Whether the repeated calibration results of the electronic scale are qualified is determined by comparing the difference between multiple measurement results of the same load and the absolute value of the maximum allowable error specified in the calibration procedures.

[0262] Specifically, taking an electronic scale with a measuring range of 15kg as an example, in order to ensure that the automatic calibration device of the electronic scale provided in this embodiment can complete zero calibration, off-center load calibration, weighing calibration and taring weighing calibration, the mass of the tray 3a, the mass of the zeroing weight 7a, the mass of the flickering weight 4a, the mass of the off-center load weight 6a and the mass of each weight in the weight string 5 remain unchanged, and the mass of each tared weight is selected to be 2.5kg.

[0263] The first vertical drive mechanism 1c drives the weighing platform 1d to move upward to the calibration area, so that the electronic scale is located under the tray 3a. Usually, the operation of centering the electronic scale is completed at this step during the calibration. At the same time, the second vertical drive mechanism 2a drives the main flange plate 2b and the electronic scale to move upward synchronously until the mass of the bottom weight in the electronic scale-bearing weight string 5 stops. At this time, the industrial camera 1f records the value displayed on the electronic scale after it stabilizes.

[0264] Next, the zeroing button in the electronic scale operation area is pressed by the pressing unit 1e to complete the zeroing operation of the electronic scale.

[0265] Then perform the following steps multiple times, usually 3 sets of data are needed, that is, repeat 3 times:

[0266] The first vertical driving mechanism 1c drives the electronic scale to move downward through the weighing platform 1d, and at the same time, the second vertical driving mechanism 2a drives the main flange plate 2b and the electronic scale to move downward synchronously until the bottom weight in the weight string 5 is separated from the electronic scale;

[0267] The first vertical driving mechanism 1c drives the electronic scale to move upward through the weighing platform 1d so that the weight string 5 passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism 2a drives the main flange plate 2b to move upward synchronously with the electronic scale. When the electronic scale bears the mass of the bottom weight in the weight string 5, the first vertical driving mechanism 1c stops and records the value displayed on the electronic scale.

[0268] After repeating the process three times, three groups of displayed values ​​are obtained. The difference between the multiple measurement results of the same load and the maximum allowable error absolute value specified in the calibration procedure are compared to determine whether the repeated calibration results of the electronic scale are qualified, thus completing the repeatability performance calibration.

[0269] Example 4

[0270] refer to Fig.11 , which is different from the embodiment 3, the calibration unit in the automatic calibration device for electronic scales further includes a threshold weight mechanism 9;

[0271] The identification threshold weight mechanism 9 includes an identification threshold weight 9a, an identification threshold tooling 9b and an identification threshold drive 9c. The identification threshold drive 9c is arranged in parallel with the flicker drive 4c, and the identification threshold drive 9c is arranged opposite to the zeroing drive 7c. The fixed end of the identification threshold drive 9c is connected to the upper flange 2c, and the output end of the identification threshold drive 9c is connected to the identification threshold tooling 9b. The identification threshold weight 9a is movably connected to the identification threshold tooling 9b. At this time, the identification threshold drive 9c is arranged on the left side of the upper flange 2c, and the identification threshold weight 9a is arranged opposite to the tray 3a, so that the identification threshold weight 9a can fall on the tray 3a. When the identification threshold drive 9c continues to extend downward, the identification threshold weight 9a does not contact the identification threshold tooling 9b, so that the electronic scale can bear the mass of the identification threshold weight 9a.

[0272] Working principle:

[0273] An automatic calibration method for an electronic scale, using the automatic calibration device for an electronic scale of this embodiment, comprises the following steps when performing a discrimination threshold calibration:

[0274] Determine the mass of the tray 3a, the mass of the flickering weight 4a and the mass of the weight string 5 according to the range of the electronic scale, and determine the three identification threshold load masses according to the range of the electronic scale;

[0275] The electronic scale is placed on the weighing platform 1d, and the first vertical driving mechanism 1c drives the electronic scale to move upward to the calibration area through the weighing platform 1d;

[0276] The second vertical driving mechanism 2a drives the tray 3a to move downwards through the main flange plate 2b until it contacts the weighing surface of the electronic scale;

[0277] The tray drive 3b drives the tray tooling 3c to move downward until the electronic scale carries the mass of the tray 3a, and the zeroing drive 7c drives the zeroing weight 7a to move downward onto the tray 3a, so that the electronic scale also carries the mass of the zeroing weight 7a. At this time, the electronic scale carries the minimum identification threshold load mass;

[0278] The multiple flicker weight mechanisms 4 place multiple flicker weights 4a corresponding to the mass and the electronic scale division value on the tray 3a through the flicker drive 4c, and record the value I displayed on the electronic scale. 1c ;

[0279] The multiple flicker weight mechanisms 4 drive the flicker weights 4a to move upward through the flicker drive 4c so that the flicker weights 4a are separated from the tray 3a one by one until the value displayed on the electronic scale decreases by one scale value, and the value displayed on the electronic scale at this time is recorded. c1 -d;

[0280] The identification threshold driver 9c places the identification threshold weight 9a on the tray 3a through the identification threshold tooling 9b so that the electronic scale carries the mass of the identification threshold weight 9a, and records the value I displayed on the electronic scale at this time. c1 ;

[0281] The identification threshold driver 9c drives the identification threshold weight 9a to move upward until the identification threshold weight 9a is separated from the tray 3a;

[0282] The first vertical driving mechanism 1c drives the electronic scale to move upward through the weighing platform 1d so that the weight string 5 passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism 2a drives the total flange plate 2b to move upward synchronously with the electronic scale, so that the electronic scale gradually carries the mass of the weight string 5 until the total mass carried by the electronic scale reaches the median identification threshold load mass; multiple flashing weight mechanisms 4 place multiple flashing weights 4a corresponding to the mass and the electronic scale graduation value on the tray 3a through the flashing drive 4c, and record the value I displayed on the electronic scale 2c ;

[0283] The multiple flicker weight mechanisms 4 drive the flicker weights 4a to move upward through the flicker drive 4c so that the flicker weights 4a are separated from the tray 3a one by one until the value displayed on the electronic scale decreases by one scale value, and the value displayed on the electronic scale at this time is recorded. c2 -d;

[0284] The identification threshold driver 9c places the identification threshold weight 9a on the tray 3a through the identification threshold tooling 9b so that the electronic scale carries the mass of the identification threshold weight 9a, and records the value I displayed on the electronic scale at this time. c2 ;

[0285] The identification threshold driver 9c drives the identification threshold weight 9a to move upward until the identification threshold weight 9a is separated from the tray 3a;

[0286] The first vertical driving mechanism 1c mechanically drives the electronic scale to move upward through the weighing platform 1d, and the second vertical driving mechanism 2a drives the main flange plate 2b to move upward synchronously with the electronic scale, so that the electronic scale continues to gradually carry the mass of the weight string 5 until the total mass carried by the electronic scale reaches the maximum identification threshold load mass; multiple flashing weight mechanisms 4 place all 10 flashing weights 4a on the tray 3a through the flashing drive 4c, and record the value I displayed on the electronic scale 3c ;

[0287] The multiple flicker weight mechanisms 4 drive the flicker weights 4a to move upward through the flicker drive 4c so that the flicker weights 4a are separated from the tray 3a one by one until the value displayed on the electronic scale decreases by one scale value, and the value displayed on the electronic scale at this time is recorded. c3 -d;

[0288] The identification threshold driver 9c places the identification threshold weight 9a on the tray 3a through the identification threshold tooling 9b so that the electronic scale carries the mass of the identification threshold weight 9a, and records the value I displayed on the electronic scale at this time. c3 ;

[0289] The identification threshold driver 9c drives the identification threshold weight 9a to move upward until the identification threshold weight 9a is separated from the tray 3a;

[0290] According to I cn =I nc +d Determine whether the electronic scale identification threshold test is qualified.

[0291] Specifically, taking an electronic scale with a range of 15kg as an example, in order to ensure that the automatic calibration device of the electronic scale provided in this embodiment can complete zero calibration, off-center load calibration, weighing calibration, taring weighing calibration and repeatability performance calibration, the mass of the tray 3a, the mass of the zeroing weight 7a, the mass of the flickering weight 4a, the mass of the off-center load weight 6a, the mass of the taring weight and the mass of each weight in the weight string 5 remain unchanged, and a load of 1.4d is placed as needed (the actual graduation value of the electronic scale with a range of 15kg is d=5g), so the mass of the identification threshold weight 9a is selected to be 7g (1.4d=7g).

[0292] According to the requirements, when calibrating the identification threshold, three loads need to be selected for calibration: the minimum weighing capacity, the maximum weighing range, and the minimum identification threshold load mass of half the maximum weighing capacity, the median identification threshold load mass, and the maximum identification threshold load mass. Therefore, the electronic scale needs to be loaded with 100g, 7.5kg, and 15kg loads.

[0293] The 100g load can be formed by the combination of the tray 3a and the zeroing weight 7a. Therefore, at this time, the preparation work is completed, and the electronic scale is placed on the weighing platform 1d. The first vertical driving mechanism 1c drives the electronic scale to move upward to the verification area through the weighing platform 1d; the second vertical driving mechanism 2a drives the tray 3a to move downward to contact with the weighing surface of the electronic scale through the total flange plate 2b; the tray driving 3b drives the tray tooling 3c to move downward until the electronic scale carries the mass of the tray 3a, and then the zeroing driving 7c drives the zeroing weight 7a to move downward onto the tray 3a, so that the electronic scale also carries the mass of the zeroing weight 7a. At this time, the electronic scale carries the minimum identification threshold load mass of 50g+50g=100g;

[0294] Next, 10 flicker weights 4a with a total mass of 5g are placed on the tray 3a under the drive of the corresponding flicker driver 4c. At this time, after the value displayed on the electronic scale stabilizes, the industrial camera 1f records the displayed value I 1c ;

[0295] Then, the flashing weights 4a are separated from the tray 3a one by one until the displayed value of the electronic scale decreases by one scale value, and the displayed value of the electronic scale is recorded by the industrial camera 1f. c1 -d;

[0296] Then the identification threshold driver 9c places the identification threshold weight 9a on the tray 3a through the identification threshold tooling 9b so that the electronic scale carries the mass 7g of the identification threshold weight 9a. After the value displayed on the electronic scale stabilizes, the industrial camera 1f records the displayed value I. c1 , through I cn =I nc +d determines whether the electronic scale identification threshold verification is qualified, n=1, completes the 100g minimum identification threshold load mass identification threshold verification.

[0297] The identification threshold driver 9c drives the identification threshold weight 9a to move upward until the identification threshold weight 9a is separated from the tray 3a;

[0298] Similarly, when the load is 7.5kg and the load is 15kg, the corresponding median identification threshold load mass and the maximum identification threshold load mass are carried by the weight string 5, and then 10 flicker weights 4a are loaded and placed on the tray 3a, and the corresponding display value I is recorded by the industrial camera 1f. nc , n = 2 or 3, and then successively remove the flash weight 4a until the value displayed on the electronic scale decreases by one division value, and record the value displayed on the electronic scale at this time I cn -d;

[0299] Then the identification threshold driver 9c places the identification threshold weight 9a on the tray 3a through the identification threshold tooling 9b so that the electronic scale carries the mass 7g of the identification threshold weight 9a. After the value displayed on the electronic scale stabilizes, the industrial camera 1f records the displayed value I. cn, through I cn =I nc +d determines whether the electronic scale identification threshold verification is qualified, n=2 or 3, and completes the identification threshold verification.

Claims

1. An automatic calibration device for electronic scales, It is characterized in that It comprises a carrying area and a verification area located above the carrying area, wherein a carrying platform (1) for placing an electronic scale is arranged in the carrying area, a pressing unit (1e) for pressing an electronic scale operation area is arranged on the carrying platform (1), and a verification unit (2) for verifying the electronic scale is arranged in the verification area; The carrying platform (1) comprises a weighing platform (1d); The verification unit (2) comprises a tray mechanism (3), a second vertical drive mechanism (2a), a main flange plate (2b), an upper flange plate (2c) and a plurality of flash weight mechanisms (4); The second vertical driving mechanism (2a) is located outside the main flange plate (2b) and is connected to the main flange plate (2b), so that the second vertical driving mechanism (2a) drives the main flange plate (2b) to move up and down; The pallet mechanism (3) comprises a pallet (3a), a pallet drive (3b) and a pallet tooling (3c); the pallet (3a) is located below the main flange plate (2b); the pallet drive (3b) is arranged on the main flange plate (2b); the upper flange plate (2c) is located between the main flange plate (2b) and the pallet (3a) and is connected to the main flange plate (2b); the top end of the pallet tooling (3c) is connected to the telescopic end of the pallet drive (3b); the bottom end of the pallet tooling (3c) passes through the upper flange plate (2c) and is movably connected to the pallet (3a); and the weighing platform (1d) is located below the pallet (3a); The flash-change weight mechanism (4) is located between the upper flange (2c) and the tray (3a). The flash-change weight mechanism (4) comprises a flash-change weight (4a), a flash-change tool (4b) and a flash-change drive (4c) which are arranged in sequence from bottom to top. The fixed end of the flash-change drive (4c) is connected to the upper flange (2c). The flash-change drive (4c) is arranged vertically. The output end of the flash-change drive (4c) is connected to the flash-change tool (4b). The flash-change weight (4a) is movably connected to the flash-change tool (4b). The flash-change weight (4a) is arranged opposite to the tray (3a). A plurality of the flash-change weight mechanisms (4) are arranged around the axis of the tray (3a).

2. The automatic calibration device for electronic scales according to claim 1, It is characterized in that The support platform (1) comprises a bottom platform (1a), a planar driving mechanism (1b) and a first vertical driving mechanism (1c); the first vertical driving mechanism (1c) is connected to the bottom platform (1a) to drive the bottom platform (1a) to reciprocate up and down; the weighing platform (1d) is connected to the bottom platform (1a) via the planar driving mechanism (1b); the planar driving mechanism (1b) drives the weighing platform (1d) to move on the bottom platform (1a); and the tapping unit (1e) is located on the weighing platform (1d).

3. The automatic calibration device for electronic scales according to claim 2, It is characterized in that The verification unit (2) further comprises a weight string (5), an offset weight mechanism (6) and a zeroing weight mechanism (7); The weight string (5) comprises a plurality of weights which are serially connected in sequence from top to bottom and have the same or different masses, and the adjacent weights are movably connected to each other. The tray (3a), the main flange plate (2b) and the upper flange plate (2c) are all provided with weight string holes at their centers, and the inner diameter of the weight string holes is larger than the outer diameter of any weight in the weight string (5). The weight string (5) is arranged along the axis of the weight string holes, and the plurality of flashing weight mechanisms (4) are arranged on the peripheral side of the weight string (5); The eccentric load weight mechanism (6) comprises an eccentric load weight (6a), an eccentric load fixture (6b) and an eccentric load drive (6c); the eccentric load drive (6c) and the flicker drive (4c) are arranged in parallel; the fixed end of the eccentric load drive (6c) is connected to the upper flange (2c); the output end of the eccentric load drive (6c) is connected to the eccentric load fixture (6b); the eccentric load weight (6a) and the eccentric load fixture (6b) are movably connected; an eccentric load hole is provided on the tray (3a); the eccentric load weight (6a) and the eccentric load hole are coaxially arranged; The zeroing weight mechanism (7) comprises a zeroing weight (7a), a zeroing tool (7b) and a zeroing drive (7c); the zeroing drive (7c) and the flicker drive (4c) are arranged in parallel; the fixed end of the zeroing drive (7c) is connected to the upper flange (2c); the output end of the zeroing drive (7c) is connected to the zeroing tool (7b); the zeroing weight (7a) and the zeroing tool (7b) are movably connected; and the zeroing weight (7a) and the tray (3a) are arranged opposite to each other.

4. The automatic calibration device for electronic scales according to claim 3, It is characterized in that The calibration unit (2) also includes a tare weight mechanism (8), the tare weight mechanism (8) includes a tare weight (8a), a tare tool (8b) and a tare drive (8c), the tare drive (8c) and the tray drive (3b) are arranged in parallel, the tare drive (8c) is connected to the main flange plate (2b), the tare drive (8c) is connected to the tare weight (8a) through the tare tool (8b), the tare tool (8b) is movably connected to the tare weight (8a), and the tare weight mechanism (8) is arranged on the peripheral side of the tray (3a).

5. The automatic calibration device for electronic scales according to claim 4, It is characterized in that The verification unit (2) further comprises a discrimination threshold weight mechanism (9), the discrimination threshold weight mechanism (9) comprising a discrimination threshold weight (9a), a discrimination threshold tooling (9b) and a discrimination threshold drive (9c), the discrimination threshold drive (9c) being arranged opposite to the zeroing drive (7c), the discrimination threshold drive (9c) being arranged in parallel with the flicker drive (4c), the fixed end of the discrimination threshold drive (9c) being connected to the upper flange (2c), the output end of the discrimination threshold drive (9c) being connected to the discrimination threshold tooling (9b), the discrimination threshold weight (9a) being movably connected to the discrimination threshold tooling (9b), and the discrimination threshold weight (9a) being arranged opposite to the tray (3a).

6. An automatic calibration method for an electronic scale, based on the automatic calibration device for an electronic scale according to any one of claims 3 to 5, It is characterized in that Including zeroing verification, the zeroing verification includes the following steps: Determining the mass of the tray (3a) and the mass of the flicker weight (4a) in the calibration unit (2) according to the measuring range of the electronic scale; The electronic scale is placed on a weighing platform (1d), and the first vertical driving mechanism (1c) drives the weighing platform (1d) to move upward to a calibration area; The second vertical driving mechanism (2a) drives the tray (3a) to move downwards through the main flange plate (2b) until it contacts the weighing surface of the electronic scale; The tray driver (3b) drives the tray fixture (3c) to move downward so that the electronic scale carries the mass L of the tray (3a), and records the value I displayed on the electronic scale. 1 ; The plurality of flicker weight mechanisms (4) place the flicker weights (4a) on the tray (3a) in sequence through corresponding flicker drives (4c), so that the electronic scale carries a mass △L of a corresponding number of flicker weights (4a) 1 , until the value displayed on the electronic scale increases by one scale value d, and record the value displayed on the electronic scale at this time I 1 +d; By E 0 =I 1 +0.5d-△L 1 -L calculates the zero calibration rounding error E 0 According to the verification regulations, the integral error E 0 Determine whether the zero calibration result of the electronic scale is qualified; The plurality of flicker weight mechanisms (4) drive the flicker weights (4a) placed on the electronic scale to rise through the flicker drive (4c) until all the flicker weights (4a) are separated from the electronic scale.

7. An electronic scale calibration method, based on the electronic scale automatic calibration device according to any one of claims 4 to 5, It is characterized in that It also includes eccentric load verification and weighing verification; The eccentric load test includes the following steps: Determining the mass of the eccentric load weight (6a), the mass of the zero-setting weight (7a) and the mass of the weight string (5) according to the measuring range of the electronic scale; The electronic scale completes the zero calibration and obtains the zero calibration integral error E 0 ; The eccentric load drive (6c) places the eccentric load weight (6a) on the weighing surface of the electronic scale through the eccentric load tool (6b) so that the electronic scale bears the mass of the eccentric load weight (6a); The tray drive (3b) drives the tray tooling (3c) to move upward until the tray (3a) is separated from the electronic scale; The weighing platform (1d) drives the electronic scale to move through the planar driving mechanism (1b) so that the verification unit (2) is located at the detection point at the corresponding position of the electronic scale, and at the same time, the eccentric load weight (6a) is separated from the eccentric load tooling (6b) and moves synchronously with the electronic scale; The first vertical driving mechanism (1c) drives the electronic scale to move upward through the weighing platform (1d) so that the weight string (5) passes through the weight string hole and contacts the weighing surface of the electronic scale, and at the same time, the second vertical driving mechanism (2a) drives the main flange plate (2b) to move upward synchronously with the electronic scale until the first vertical driving mechanism (1c) stops when the electronic scale carries the mass of the weight string (5); The tray drive (3b) drives the tray tooling (3c) to move downward until the electronic scale carries the mass L of the tray (3a); The zeroing drive (7c) drives the zeroing weight (7a) to move downward onto the tray (3a), so that the electronic scale carries the mass of the zeroing weight (7a) and records the value I displayed on the electronic scale. 2 ; The plurality of flicker weight mechanisms (4) place the flicker weights (4a) on the tray (3a) in sequence through corresponding flicker drives (4c), so that the electronic scale carries a mass △L of a corresponding number of flicker weights (4a) 2 , until the value displayed on the electronic scale increases by one scale value d, and record the value displayed on the electronic scale at this time I 2 +d; By E c =EE 0 Calculate the correction error E of each detection point in the eccentric load verification c , where E 0 =I 1 +0.5d-△L 1 -L, E = I 2 +0.5d-△L 2 -L; Compare the correction error obtained by measuring the same load at different positions of the electronic scale with the absolute value of the maximum allowable error specified in the verification regulations to determine whether the electronic scale eccentric load verification result is qualified; The weighing platform (1d) drives the electronic scale to move to an initial position via a planar driving mechanism (1b); The plurality of flicker weight mechanisms (4) drive the flicker weights (4a) placed on the electronic scale to rise through the flicker drive (4c) until all the flicker weights (4a) are separated from the electronic scale; The eccentric load drive (6c) drives the eccentric load weight (6a) to move upward and separate from the tray; The zero setting drive (7c) drives the zero setting weight (7a) to move upward and separate from the tray (3a); The tray drive (3b) drives the tray (3a) to move upward so that the tray (3a) is separated from the electronic scale; The first vertical driving mechanism (1c) drives the electronic scale to move downward via the weighing platform (1d) so that the weight string (5) is separated from the weighing surface of the electronic scale; Weighing verification includes the following steps: The electronic scale completes the eccentric load verification; The second vertical driving mechanism (2a) drives the tray (3a) to move downwards through the main flange plate (2b) until it contacts the weighing surface of the electronic scale; The pallet drive (3b) drives the pallet tooling (3c) to move downward until the electronic scale carries the mass of the pallet (3a), and the total mass carried by the electronic scale reaches the mass at the load point corresponding to the lift indication error, and the value displayed by the electronic scale is recorded; The zeroing drive (7c) drives the zeroing weight (7a) to move downward onto the tray (3a), so that the electronic scale carries the mass of the zeroing weight (7a), and the total mass carried by the electronic scale reaches the mass of the load point corresponding to the lift indication error, and the value displayed by the electronic scale is recorded; The eccentric load drive (6c) places the eccentric load weight (6a) on the weighing surface of the electronic scale through the eccentric load tool (6b) so that the electronic scale bears the mass of the eccentric load weight (6a); The first vertical driving mechanism (1c) drives the electronic scale to move upward through the weighing platform (1d) so that the weight string (5) passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism (2a) drives the total flange plate (2b) to move upward synchronously with the electronic scale so that the electronic scale gradually carries the mass of the weight string (5) until the total mass carried by the electronic scale reaches the mass at the corresponding lift indication error load point. The first vertical driving mechanism (1c) stops and the value displayed by the electronic scale at this time is recorded. The first vertical driving mechanism (1c) drives the electronic scale to continue to move upwards through the weighing platform (1d), and at the same time, the second vertical driving mechanism (2a) drives the main flange plate (2b) and the electronic scale to move upwards synchronously, so that the electronic scale sequentially carries the lift indication error load points and records the electronic scale display values ​​at the corresponding moments, thereby completing the weighing of the corresponding load points; The first vertical driving mechanism (1c) drives the electronic scale to move downward through the weighing platform (1d), and at the same time, the second vertical driving mechanism (2a) drives the main flange plate (2b) and the electronic scale to move downward synchronously, so that the electronic scale sequentially carries the return indication error load point and records the electronic scale display value at the corresponding time, until the weight string (5) is separated from the load-bearing end surface of the electronic scale; The eccentric load drive (6c) drives the eccentric load weight (6a) to move upward and separate from the tray, and the value displayed on the electronic scale at this time is recorded to complete the weighing of all return indication error load points.

8. An electronic scale calibration method, based on the electronic scale automatic calibration device according to claim 5, It is characterized in that It also includes peeling weighing verification and repeatability verification; The peeling and weighing verification comprises the following steps: Tare and zero setting: The electronic scale completes weighing verification; Determine the mass of the tared weight (8a) according to the measuring range of the electronic scale; The tare drive (8c) drives the tare weight (8a) to move downward through the tare tool (8b) so that the electronic scale carries the mass of the tare weight (8a); Press the tare button in the operation area of ​​the electronic scale by pressing the pressing unit (1e); Weighing after peeling: The second vertical driving mechanism (2a) drives the tray (3a) to move downwards through the main flange plate (2b) until it contacts the weighing surface of the electronic scale; The tray drive (3b) drives the tray tooling (3c) to move downward until the electronic scale carries the mass of the tray (3a), and the zeroing drive (7c) drives the zeroing weight (7a) to move downward onto the tray (3a), so that the electronic scale carries the mass of the zeroing weight (7a). At this time, the load carried by the electronic scale during taring is L b1 , record the value I displayed on the electronic scale at this time b1 , complete one lift measurement load bearing; The plurality of flicker weight mechanisms (4) sequentially place the flicker weights (4a) on the tray (3a) in sequence through corresponding flicker drives (4c), so that the electronic scale carries a mass △L of a corresponding number of flicker weights (4a) b1 , until the value displayed on the electronic scale increases by one scale value d, and record the value displayed on the electronic scale at this time I b1 +d, then the flicker drive (4c) drives all the flicker weights (4a) to separate from the electronic scale, and through E b1 =I b1 +0.5d-△L b1 -L b1 Calculate the weighing error of the measured load; The eccentric load drive (6c) places the eccentric load weight (6a) on the weighing surface of the electronic scale through the eccentric load tool (6b) so that the electronic scale bears the mass of the eccentric load weight (6a); The first vertical driving mechanism (1c) drives the electronic scale to move upward through the weighing platform (1d), so that the weight string (5) passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism (2a) drives the main flange plate (2b) and the electronic scale to move upward synchronously, so that the mass of the weight string (5) is gradually loaded on the weighing surface of the electronic scale. Whenever the load of the electronic scale reaches a lift measurement load L bn Then, record the displayed value I of the electronic scale at the corresponding time bn Then, a plurality of flicker weight mechanisms (4) drive the corresponding flicker drive (4c) to move the mass △L bn The flash weights (4a) are placed on the tray (3a) in sequence until the electronic scale displays an increase in a scale value, and the value I displayed on the electronic scale is recorded. bn +d, the flash drive (4c) drives all the flash weights (4a) to separate from the electronic scale, and through E bn =I bn +0.5d-△L bn -L bn Calculate the weighing error of the measured load, n = (1, 2, ..., n) until the corresponding lift measurement load is loaded; The first vertical driving mechanism (1c) drives the electronic scale to move downward through the weighing platform (1d), and at the same time, the second vertical driving mechanism (2a) drives the main flange plate (2b) and the electronic scale to move downward synchronously, so that the weight string (5) gradually leaves the weighing surface of the electronic scale. Whenever the load of the electronic scale reaches a return measurement load L Bn Then, record the displayed value I of the electronic scale at the corresponding time Bn Then, the plurality of flicker weight mechanisms (4) place the flicker weights (4a) on the tray (3a) in sequence through the corresponding flicker drive (4c) until the electronic scale display increases by one scale value, and the value I displayed on the electronic scale at this time is recorded. Bn +d, the flash drive (4c) drives all the flash weights (4a) to separate from the electronic scale, and through E Bn =I Bn +0.5d-△L Bn -L Bn Calculate the weighing error of the measured load until the weight string (5) leaves the weighing surface of the electronic scale and completes the return measurement load bearing; According to the verification procedure, the weighing error E Bn Determine whether the electronic scale zero calibration is qualified; The eccentric load drive (6c) drives the eccentric load weight (6a) to move upward and separate from the tray; The tray drive (3b) drives the tray (3a) to move upward so that the tray (3a) is separated from the electronic scale; The tare drive (8c) drives the tare weight (8a) to move upward and separate from the electronic scale; Press the zero reset button in the electronic scale operation area by pressing the pressing unit (1e); The repeatability test comprises the following steps: Determine the mass of the weight string (5) according to the measuring range of the electronic scale; The electronic scale is placed on a weighing platform (1d), and the first vertical driving mechanism (1c) drives the electronic scale to move upward to a calibration area via the weighing platform (1d); The first vertical driving mechanism (1c) drives the electronic scale to move upward through the weighing platform (1d) so that the weight string (5) passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism (2a) drives the main flange plate (2b) to move upward synchronously with the electronic scale. When the electronic scale bears the mass of the weight string (5), the first vertical driving mechanism (1c) stops and records the value displayed on the electronic scale. Press the zero reset button in the electronic scale operation area by pressing the pressing unit (1e); Repeat the following steps multiple times: The first vertical driving mechanism (1c) drives the electronic scale to move downward through the weighing platform (1d), and at the same time, the second vertical driving mechanism (2a) drives the main flange plate (2b) and the electronic scale to move downward synchronously until the weight string (5) is separated from the electronic scale; The first vertical driving mechanism (1c) drives the electronic scale to move upward through the weighing platform (1d) so that the weight string (5) passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism (2a) drives the main flange plate (2b) to move upward synchronously with the electronic scale. When the electronic scale bears the mass of the weight string (5), the first vertical driving mechanism (1c) stops and records the value displayed on the electronic scale. Whether the repeated calibration results of the electronic scale are qualified is determined by comparing the difference between multiple measurement results of the same load and the absolute value of the maximum allowable error specified in the calibration procedures.

9. An electronic scale calibration method, based on the electronic scale automatic calibration device according to claim 5, It is characterized in that It also includes a discrimination threshold test, wherein the discrimination threshold test includes the following steps: Determine the mass of the tray (3a), the mass of the flickering weight (4a) and the mass of the weight string (5) according to the range of the electronic scale, and determine the masses of three identification threshold loads according to the range of the electronic scale; The electronic scale is placed on a weighing platform (1d), and the first vertical driving mechanism (1c) drives the electronic scale to move upward to a calibration area via the weighing platform (1d); The second vertical driving mechanism (2a) drives the tray (3a) to move downwards through the main flange plate (2b) until it contacts the weighing surface of the electronic scale; The tray drive (3b) drives the tray tooling (3c) to move downward until the electronic scale carries the mass of the tray (3a), and the zeroing drive (7c) drives the zeroing weight (7a) to move downward onto the tray (3a), so that the electronic scale simultaneously carries the mass of the zeroing weight (7a). At this time, the electronic scale carries the minimum identification threshold load mass; The plurality of flicker weight mechanisms (4) place all the plurality of flicker weights (4a) whose masses correspond to the electronic scale graduation values ​​on the tray (3a) through the flicker drive (4c), and record the electronic scale display value I 1c ; The plurality of flicker weight mechanisms (4) drive the flicker weights (4a) to move upwards through the flicker drive (4c) so that the flicker weights (4a) are separated from the tray (3a) one by one until the value displayed on the electronic scale decreases by one division value, and the value displayed on the electronic scale at this time is recorded. c1 -d; The identification threshold driver (9c) places the identification threshold weight (9a) on the tray (3a) through the identification threshold tooling (9b) so that the electronic scale carries the mass of the identification threshold weight (9a), and records the value I displayed on the electronic scale at this time. c1 ; The identification threshold drive (9c) drives the identification threshold weight (9a) to move upward until the identification threshold weight (9a) is separated from the tray (3a); The first vertical driving mechanism (1c) drives the electronic scale to move upward through the weighing platform (1d) so that the weight string (5) passes through the weight string hole and contacts the weighing surface of the electronic scale. At the same time, the second vertical driving mechanism (2a) drives the main flange plate (2b) to move upward synchronously with the electronic scale, so that the electronic scale gradually carries the mass of the weight string (5) until the total mass carried by the electronic scale reaches the median identification threshold load mass; the multiple flashing weight mechanisms (4) place all the multiple flashing weights (4a) corresponding to the mass and the electronic scale graduation value on the tray (3a) through the flashing drive (4c), and record the value I displayed on the electronic scale. 2c ; The plurality of flicker weight mechanisms (4) drive the flicker weights (4a) to move upwards through the flicker drive (4c) so that the flicker weights (4a) are separated from the tray (3a) one by one until the value displayed on the electronic scale decreases by one division value, and the value displayed on the electronic scale at this time is recorded. c2 -d; The identification threshold driver (9c) places the identification threshold weight (9a) on the tray (3a) through the identification threshold tooling (9b) so that the electronic scale carries the mass of the identification threshold weight (9a), and records the value I displayed on the electronic scale at this time. c2 ; The identification threshold drive (9c) drives the identification threshold weight (9a) to move upward until the identification threshold weight (9a) is separated from the tray (3a); The first vertical drive mechanism (1c) mechanically drives the electronic scale to move upward through the weighing platform (1d), and the second vertical drive mechanism (2a) drives the main flange plate (2b) to move upward synchronously with the electronic scale, so that the electronic scale continues to gradually carry the mass of the weight string (5) until the total mass carried by the electronic scale reaches the maximum identification threshold load mass; the multiple flashing weight mechanisms (4) place all the multiple flashing weights (4a) corresponding to the mass and the electronic scale graduation value on the tray (3a) through the flashing drive (4c), and record the value I displayed by the electronic scale 3c ; The plurality of flicker weight mechanisms (4) drive the flicker weights (4a) to move upwards through the flicker drive (4c) so that the flicker weights (4a) are separated from the tray (3a) one by one until the value displayed on the electronic scale decreases by one division value, and the value displayed on the electronic scale at this time is recorded. c3 -d; The identification threshold driver (9c) places the identification threshold weight (9a) on the tray (3a) through the identification threshold tooling (9b) so that the electronic scale carries the mass of the identification threshold weight (9a), and records the value I displayed on the electronic scale at this time. c3 ; The identification threshold drive (9c) drives the identification threshold weight (9a) to move upward until the identification threshold weight (9a) is separated from the tray (3a); According to I cn =I nc +d Determine whether the electronic scale identification threshold test is qualified.

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