CN109556698B - Gravity center correction device of scale and scale correction method based on device - Google Patents
Gravity center correction device of scale and scale correction method based on device Download PDFInfo
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- CN109556698B CN109556698B CN201811414822.9A CN201811414822A CN109556698B CN 109556698 B CN109556698 B CN 109556698B CN 201811414822 A CN201811414822 A CN 201811414822A CN 109556698 B CN109556698 B CN 109556698B
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Abstract
The invention is suitable for the technical field of correcting devices, and provides a gravity center correcting device of a scale and a scale correcting method based on the device; the device includes: the calibration board, the balancing weight, light rope and moving mechanism, place the balancing weight on the first calibration groove of calibration board during the use, the calibration board bears the pressure of balancing weight, thereby obtain the weight indicating value of four weighing sensor on the balance of waiting to rectify, and then utilize four weight indicating values to acquire theoretical barycentric coordinate and current barycentric coordinate after the balance of waiting to rectify was pressed, utilize theoretical barycentric coordinate and current barycentric coordinate to judge at last whether up to standard of calibration, if not up to standard then adjust up to standard until the calibration according to the correction mode of predetermineeing to the adjustment factor of balance, therefore whole adjustment process is convenient, can carry out the adjustment of different degrees to the different scales of the skew degree of gravity, the suitability is good, can obtain more accurate current barycentric coordinate simultaneously, the balance after having improved the correction detects centrobaric accuracy greatly.
Description
Technical Field
The invention belongs to the technical field of correction devices, and particularly relates to a gravity center correction device of a scale and a scale correction method based on the gravity center correction device.
Background
The human body balance ability means that the human body controls the gravity center of the body under specific environment or external force interference to keep the body in a certain posture or stable state. The process of maintaining balance is to input the perception of vision, vestibule and body to the central nerve first, the central nerve is integrated, and finally the balance is realized through the control of the motor system. The balance ability plays a vital role in daily life, if the balance ability of the human body is disturbed, not only the standing balance is influenced, but also the life quality and the independent living ability of people are negatively influenced, and a series of complications caused by the disturbance of the balance ability also appear. For balance disorder, modern medicine can exercise the control ability of the muscular-neural regulation system by performing special balance test and training, thereby improving the human body balance regulation ability.
In the process of evaluating the human body balance ability level, because the human body gravity center is one of the basic parameters capable of reflecting the human body morphological structure and mass distribution characteristics in the human body link inertia parameters, the human body gravity center is closely related to the motion of the human body, and the human body balance ability and muscle motion ability are reflected to a certain extent, the human body balance ability level is often evaluated by adopting a mode of dynamically tracking the gravity center.
Currently, in order to evaluate the level of human body balance ability, a balance tester (such as a human body scale) is used for dynamically tracking the gravity center to obtain a gravity center change track. When the balance tester leaves a factory, the geometric center is set as the center of gravity by default, but actually, because of manufacturing errors and assembly errors, the situation that the actual center of gravity deviates from the geometric center often occurs, so that the geometric center is directly used as the center of gravity, the actual change track of the center of gravity cannot be detected, the detection error is large, and the accuracy is low.
Disclosure of Invention
The invention aims to provide a gravity center correction device of a scale and a scale correction method based on the device, and aims to solve the problem that the detection accuracy is low due to the fact that the situation that the actual gravity center deviates from the geometric center is not considered in the prior art.
In one aspect, the present invention provides a gravity center correction device for a scale, the device comprising:
the calibration plate is overlapped and stacked on the scale to be calibrated, the shape and the size of the calibration plate are consistent with those of the scale to be calibrated, a first calibration groove is formed in the geometric center of the calibration plate, and the scale to be calibrated is provided with four weighing sensors which are circumferentially distributed around the geometric center of the scale to be calibrated;
the first calibration groove is used for calibrating the pressure applying position of the balancing weight;
a light rope connected with the counterweight block; and
and the moving mechanism drives the light rope to move along the horizontal or vertical direction.
Preferably, the weight member includes:
a head part attached to the edge line of the notch of the first calibration slot; and
the head part is fixedly connected with the main body.
Preferably, the head is spherical or conical.
Preferably, the calibration plate is further provided with a plurality of second calibration grooves which are uniformly distributed around the geometric center of the calibration plate in a circumferential manner and used for calibrating the pressing position of the balancing weight.
In another aspect, the present invention provides a method for calibrating a scale based on the above gravity center calibration apparatus for a scale, the method comprising:
placing a balancing weight on a currently selected calibration groove of a calibration plate to apply pressure to the calibration plate to obtain four weight indication values of four weighing sensors on a scale to be corrected;
acquiring a theoretical gravity center coordinate of the scale to be corrected in a preset coordinate system after being pressed according to the four weight indication values and a preset theoretical gravity center acquisition algorithm;
acquiring the current barycentric coordinate of the scale to be corrected in the preset coordinate system according to the four weight indicating values and a preset trimming factor of the scale to be corrected;
judging whether the calibration of the preset calibration slot reaches the standard or not according to the theoretical barycentric coordinate, the current barycentric coordinate and a preset calibration standard judgment condition;
when the current calibration of the preset calibration slot is not up to the standard, the trimming factor is adjusted according to a preset correction mode, the step of obtaining the current barycentric coordinate of the scale to be corrected in the preset coordinate system is skipped until the calibration of the preset calibration slot is up to the standard, and when the current calibration of the preset calibration slot is up to the standard, the next selected calibration slot is received.
Preferably, before the step of placing the weight block on the calibration slot of the calibration plate, the method further comprises:
and superposing the calibration plates on a scale to be corrected.
Preferably, the calibration slot comprises a first calibration slot and/or a plurality of second calibration slots, the first calibration slot is located at the geometric center of the calibration plate, and the second calibration slots are uniformly distributed around the geometric center of the calibration plate in a circumferential manner.
Preferably, the step of obtaining the theoretical barycentric coordinate of the scale to be corrected in the preset coordinate system after being pressed according to the four weight indication values and a preset theoretical barycentric obtaining algorithm includes:
according to the formula one
Obtaining the theoretical weightAbscissa x of the cardiac coordinatec1According to the formula two
Acquiring the ordinate y of the theoretical barycentric coordinatec1Wherein w is1、w2、w3、w4And the weight display device is used for displaying four weight values corresponding to four weighing sensors one by one, w represents the length of the scale to be corrected, and h represents the width of the scale to be corrected.
Preferably, the step of obtaining the current barycentric coordinate of the scale to be corrected in the preset coordinate system according to the four weight indication values and a preset trimming factor of the scale to be corrected includes:
according to the formula three
Acquiring the abscissa x of the current barycentric coordinatec2According to the formula four
Acquiring the ordinate y of the actual barycentric coordinatec2Wherein w is1、w2、w3、w4Representing four weight indications, f, corresponding one-to-one to four weighing cellshRepresenting a predetermined x-axis direction center of gravity deviation adjustment factor, fvAnd the gravity center deviation adjustment factor in the y-axis direction is preset, w represents the length of the scale to be corrected, and h represents the width of the scale to be corrected.
Preferably, the step of determining whether the calibration of the preset calibration slot is up to standard according to the theoretical barycentric coordinate, the current barycentric coordinate and a preset calibration up-to-standard determination condition includes:
according to the formula five
Obtaining an error D of the actual barycentric coordinate, wherein xs1For the abscissa, y, of the first calibration slot or the second calibration slot being calibrated this times1Is calibrated for this timeThe ordinate, D, of the first or second calibration slotthdIs a preset allowable error value; when D is present<DthdWhen the actual barycentric coordinate error D is less than the preset allowable error value DthdThe calibration is up to standard, when D is more than or equal to DthdWhen the actual barycentric coordinate error D is equal to or greater than the preset allowable error value DthdAnd the calibration does not reach the standard.
Preferably, the calibration plate is rectangular, and the preset coordinate system takes the geometric center of the calibration plate as an origin, the direction parallel to the length of the calibration plate as an x-axis direction, and the direction parallel to the width of the calibration plate as a y-axis direction.
Preferably, the step of placing a weight block on a currently selected calibration slot on the calibration plate includes:
and moving the light rope and the balancing weight connected with the light rope to the position right above the currently selected calibration groove through a moving mechanism, and releasing the light rope to enable the balancing weight to apply pressure to the calibration plate.
The calibration plate, the balancing weight, the light rope and the moving mechanism provided by the embodiment of the invention are characterized in that the balancing weight is used for applying pressure to the calibration plate, the first calibration groove of the calibration plate is used for calibrating the pressure applying position of the balancing weight, the light rope is used for connecting with the balancing weight, the moving mechanism is used for driving the light rope to move along the horizontal direction or the vertical direction, the weighing sensor is used for measuring the weight of a human body on a scale to be calibrated in real time, when the calibration plate is used, the balancing weight is placed on the first calibration groove of the calibration plate, the calibration plate bears the pressure of the balancing weight, so that weight indication values of four weighing sensors on the scale to be calibrated are obtained, further, a theoretical barycentric coordinate and a current barycentric coordinate (namely an actual barycentric coordinate) of the scale to be calibrated after being pressed are obtained by the four weight indication values, finally, whether the calibration is up to the standard is judged by the theoretical barycentric, therefore, the whole adjusting process is convenient, scales with different gravity center deviation degrees can be adjusted in different degrees, the applicability is good, more accurate current gravity center coordinates can be obtained, and the accuracy of gravity center detection of the scales after correction is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a gravity center calibration device of a scale according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a scale to be calibrated according to an embodiment of the present invention;
fig. 3 is a flowchart of an implementation of a scale calibration method according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of specific implementations of the present invention is provided in conjunction with specific embodiments:
the first embodiment is as follows:
fig. 1 shows a structure of a gravity center correction device of a scale according to a first embodiment of the present invention, fig. 2 shows a schematic structural diagram of a scale to be corrected used in the first embodiment of the present invention, and for convenience of explanation, only the parts related to the first embodiment of the present invention are shown, and the detailed description is as follows:
the gravity center correction device 1 of the scale provided by the embodiment of the invention comprises a calibration plate 10, a balancing weight 11, a light rope 12 and a moving mechanism 13;
the calibration plate 10 is overlapped on the balance 14 to be calibrated and is used for replacing the balance 14 to be calibrated to be in direct contact with the balancing weight 11, so as to prevent the balance 14 to be calibrated from being scratched, further, in order to maximize the stressed area of the balance 14 to be calibrated when applying pressure, the shapes and the sizes of the calibration plate 10 and the balance 14 to be calibrated are consistent, the balancing weight 11 is used for applying pressure on the calibration plate 10, so that the corresponding weight indication values of the four weighing sensors 15 on the balance 14 to be calibrated change after being stressed, the calibration plate 10 is provided with a first calibration groove 180 at the geometric center for calibrating the pressure applying position of the balancing weight 11, the light rope 12 is used for being connected with the balancing weight 11, the moving mechanism 13 (such as a mechanical arm or an XY axis moving platform) is used for driving the light rope 12 to move along the horizontal direction or the vertical direction, so as to save manpower, the balance 14 to be calibrated is provided with the four weighing sensors 15 distributed circumferentially around the geometric center, so as to obtain the weight, realize diversified the detection, place balancing weight 11 on the first calibration groove 180 of calibration board 10 during the use, calibration board 10 waits to rectify balance 14 and bear the pressure of balancing weight 11, thereby obtain four weight indicating values of four weighing sensor, and then utilize four weight indicating values to acquire theoretical barycentric coordinate and current barycentric coordinate (being actual barycentric coordinate) after waiting to rectify the balance pressurized, utilize theoretical barycentric coordinate and current barycentric coordinate to judge at last whether up to standard of calibration, if not up to standard then adjust the trimming factor of balance according to the correction mode of predetermineeing, until the calibration is up to standard, therefore whole adjustment process is convenient, can carry out the adjustment of different degrees to the different scales of the skew degree of gravity, the suitability is good, can obtain more accurate current barycentric coordinate simultaneously, the focus accuracy is detected to the balance after having improved the correction greatly.
In the embodiment of the invention, in order to avoid that the weight of the balancing weight is improperly set to cause difficulty in acquiring the weight indication value of the weighing sensor on the scale to be corrected, preferably, the weight of the balancing weight is 1/8 to 1/4 of the maximum weighing weight of the scale to be corrected, so that the weighing sensor has obvious numerical value change, and the weight indication value is conveniently and quickly acquired. As shown in fig. 1, in order to accurately press the calibration plate at the designated pressing position by the weight member, it is preferable that the weight member 11 includes a head portion 16 and a body 17 connected to the light string 12, and when the head portion 16 is fitted to the edge line of the notch of the first calibration groove, the positioning of the weight member is completed, so as to ensure that the weight member is pressed at the desired pressing position, and thus the obtained weight indication value is more referential. In order to delay the abrasion speed of the calibration plate, it is further preferable that the head of the balancing weight is spherical or conical, and the pressure on the calibration plate is reduced by increasing the contact area with the calibration groove, so that the service life of the calibration plate is prolonged. In order to simplify the judgment, the first calibration groove is arranged at the key position of the calibration plate, namely the geometric center, if the gravity center of the scale is coincided with the geometric center when the scale is not stressed, the current gravity center obtained by placing the balancing weight in the first calibration groove can still be coincided with the geometric center, if the current gravity center is not coincided with the geometric center, the adjustment factor of the scale needs to be adjusted, and the method for judging whether the adjustment needs to be carried out is simple and visual. As shown in fig. 1, in order to further improve the detection accuracy, it is preferable that, in addition to the first calibration groove 180, a plurality of second calibration grooves 181 uniformly distributed around the geometric center of the calibration plate in a circumferential manner are further provided on the calibration plate, so as to ensure that the calibration grooves cover the critical positions of the calibration plate (i.e. the positions of the geometric center and a plurality of points uniformly distributed around the geometric center in a circumferential manner), thereby obtaining the weight indication values of the critical positions and improving the detection accuracy. Wherein, the number of second calibration groove can carry out nimble setting according to actual need and calibration board area.
Preferably, when the theoretical barycentric coordinate and the current barycentric coordinate (namely the actual barycentric coordinate) of the scale to be corrected after being pressed are obtained by the four weight indication values, firstly, the theoretical barycentric coordinate of the scale to be corrected in the preset coordinate system after being pressed is obtained according to the four weight indication values and a preset theoretical barycentric obtaining algorithm, then, the current barycentric coordinate of the scale to be corrected in the preset coordinate system is obtained according to the four weight indication values and a preset trimming factor of the scale to be corrected, and then whether the preset calibration of the calibration slot reaches the standard is further judged according to the theoretical barycentric coordinate, the current barycentric coordinate and a preset calibration standard-reaching judgment condition, so that the more accurate trimming factor for calculating the current barycentric coordinate is obtained, and the accuracy of the corrected scale in detecting.
Further preferably, when acquiring the coordinates of the theoretical center of gravity in the preset coordinate system after the scale to be corrected is pressed according to the four weight indication values and the preset algorithm for acquiring the theoretical center of gravity,
according to the formula one
Obtaining the abscissa x of the theoretical barycentric coordinatec1According to the formula two
Obtaining the ordinate y of the theoretical barycentric coordinatec1Wherein w is1、w2、w3、w4Representation and four weighing sensorsFour weight indication values which correspond one by one, w represents the length of the scale to be corrected, and h represents the width of the scale to be corrected;
further preferably, when the current gravity center coordinate of the scale to be corrected in the preset coordinate system is acquired according to the four weight indicating values and the preset trimming factor of the scale to be corrected,
according to the formula three
Obtaining the abscissa x of the current barycentric coordinatec2According to the formula four
Obtaining the ordinate y of the actual barycentric coordinatec2Wherein w is1、w2、w3、w4Representing four weight indications, f, corresponding one-to-one to four weighing cellshRepresenting a predetermined x-axis direction center of gravity deviation adjustment factor, fvAnd the gravity center deviation adjustment factor in the preset y-axis direction is represented, w represents the length of the scale to be corrected, and h represents the width of the scale to be corrected.
Further preferably, when the theoretical barycentric coordinate and the current barycentric coordinate are used for judging whether the calibration is up to the standard, the formula five is used
Error D of the actual barycentric coordinates is obtained, where xs1For the abscissa, y, of the first calibration slot or the second calibration slot to be calibrated this times1For the ordinate, D, of the first calibration slot or second calibration slot being calibrated this timethdIs a preset allowable error value; when D is present<DthdWhen the actual barycentric coordinate error D is less than the preset allowable error value DthdThe calibration is up to standard, when D is more than or equal to DthdWhen the error D of the actual barycentric coordinates is equal to or greater than the preset allowable error value DthdAnd the calibration does not reach the standard, so that a more accurate trimming factor for calculating the current barycentric coordinate is obtained, and the accuracy of the corrected scale for detecting the barycentric is improved.
The calibration plate, the balancing weight, the light rope and the moving mechanism provided by the embodiment of the invention are characterized in that the balancing weight is used for applying pressure to the calibration plate, the first calibration groove of the calibration plate is used for calibrating the pressure applying position of the balancing weight, the light rope is used for connecting with the balancing weight, the moving mechanism is used for driving the light rope to move along the horizontal direction or the vertical direction, the weighing sensor is used for measuring the weight of a human body on a scale to be calibrated in real time, when the calibration plate is used, the balancing weight is placed on the first calibration groove of the calibration plate, the calibration plate bears the pressure of the balancing weight, so that weight indication values of four weighing sensors on the scale to be calibrated are obtained, further, a theoretical barycentric coordinate and a current barycentric coordinate (namely an actual barycentric coordinate) of the scale to be calibrated after being pressed are obtained by the four weight indication values, finally, whether the calibration is up to the standard is judged by the theoretical barycentric, therefore, the whole adjusting process is convenient, scales with different gravity center deviation degrees can be adjusted in different degrees, the applicability is good, more accurate current gravity center coordinates can be obtained, and the accuracy of gravity center detection of the scales after correction is greatly improved.
Example two:
fig. 3 illustrates a scale calibration method provided in the second embodiment of the present invention, and for convenience of description, only the parts related to the second embodiment of the present invention are illustrated, which are detailed as follows:
in step S101, a weight block is placed on a currently selected calibration slot of a calibration plate to apply pressure to the calibration plate to obtain four weight indications of four weighing sensors on a scale to be calibrated.
The embodiment of the invention is suitable for a correction device for correcting the gravity center of a human body balance tester (such as an intelligent scale), and is particularly suitable for the device in the embodiment I, so that the calibration scale can be corrected quickly and accurately through the device.
In the embodiment of the invention, the currently selected calibration slot refers to any uncalibrated calibration slot, and each uncalibrated calibration slot can be ensured to be calibrated by sequentially selecting the uncalibrated calibration slot for calibration, so that the condition of missing detection is prevented. Preferably, the calibration slots include a first calibration slot and/or a plurality of second calibration slots, the first calibration slot is located at the geometric center of the calibration plate, and the plurality of second calibration slots are uniformly distributed around the geometric center of the calibration plate in a circumferential manner, so that the set calibration slots can cover the key positions of the calibration plate (such as the positions of a plurality of points uniformly distributed in a circumferential manner at the geometric center, at the center of gravity, around the center of gravity or at the geometric center), and therefore the weight indication values corresponding to the key positions can be obtained subsequently, and a more accurate obtaining algorithm of the current barycentric coordinate is obtained. Further preferably, the calibration plate is rectangular or circular, the key positions on the calibration plate refer to the geometric center and four corner positions which are uniformly distributed around the geometric center in a circumferential manner, and the calibration plate is easy to process due to the regular shape, so that the geometric center and the four corner positions can be conveniently determined. Preferably, before the balancing weight is placed on the currently selected calibration groove of the calibration plate, the calibration plate is overlapped and stacked on the scale to be calibrated, the stress area of the scale to be calibrated is increased so as to reduce the pressure borne by the scale to be calibrated, and the service life of the scale to be calibrated is ensured not to be negatively influenced by multiple times of calibration. Preferably, the light rope and the balancing weight connected with the light rope are moved to the position right above the currently selected calibration groove through the moving mechanism, the light rope is released to enable the balancing weight to apply pressure to the calibration plate, the moving mechanism can rapidly complete movement in four directions, namely front, back, left and right, manpower is saved, and further preferably, the moving mechanism selects a mechanical arm or an XY axis moving platform. Adopt light rope, its quality compares with the balancing weight quality can be ignored to can acquiesce for the scale board pressure that receives is the same with the size of balancing weight gravity.
In step S102, the theoretical barycentric coordinates of the scale to be corrected in the preset coordinate system after being pressed are obtained according to the four weight indication values and a preset theoretical barycentric obtaining algorithm.
Preferably, when the theoretical gravity center coordinate in the preset coordinate system after the scale to be corrected is pressed is obtained according to the four weight indication values and a preset theoretical gravity center obtaining algorithm,
according to the formula one
Obtaining the abscissa x of the theoretical barycentric coordinatec1According to the formula two
Obtaining the ordinate y of the theoretical barycentric coordinatec1Wherein w is1、w2、w3、w4Four weight indications corresponding to the four weighing sensors are shown, w represents the length of the scale to be corrected, and h represents the width of the scale to be corrected.
Preferably, the calibration plate is rectangular, a coordinate system is preset, the geometric center of the calibration plate is used as an original point, the direction parallel to the length of the calibration plate is used as the x-axis direction, the direction parallel to the width of the calibration plate is used as the y-axis direction, the establishment of the coordinate system is simplified, and the coordinates of the first calibration groove and the second calibration groove are easy to mark.
In step S103, the current barycentric coordinate of the scale to be corrected in the preset coordinate system is obtained according to the four weight indication values and the preset trimming factor of the scale to be corrected.
Preferably, when the current gravity center coordinate of the scale to be corrected in the preset coordinate system is obtained according to the four weight indicating values and the preset trimming factor of the scale to be corrected,
according to the formula three
Obtaining the abscissa x of the current barycentric coordinatec2According to the formula four
Obtaining the ordinate y of the actual barycentric coordinatec2Wherein w is1、w2、w3、w4Representing four weight indications, f, corresponding one-to-one to four weighing cellshRepresenting a predetermined x-axis direction center of gravity deviation adjustment factor, fvAnd the gravity center deviation adjustment factor in the preset y-axis direction is represented, w represents the length of the scale to be corrected, and h represents the width of the scale to be corrected.
In the embodiment of the present invention fhRepresents a preset x-axis direction gravity center deviation trimming factor, f, based on past correction experiencevRepresents a y-axis direction center-of-gravity deviation adjustment factor, f, preset based on past correction experienceh、fvThe values are positive numbers, and the numerical value adjustment amplitude of the trimming factor is correspondingly set according to the error magnitude. Illustratively, before correction, f ish、fvIs set to 0.5, and if the calibration is not passed, the value is adjusted so that the coordinate deviation of the x-axis is larger than that of the y-axis, and f can be adjustedh、fvThe initial values of the correction factors are set to be 0.3 and 0.35, the center of gravity correction is realized by adjusting the trimming factors, and the accuracy of the corrected scale for detecting the center of gravity is improved.
In step S104, it is determined whether the calibration of the preset calibration slot is up to standard according to the theoretical barycentric coordinate, the current barycentric coordinate, and a preset calibration up-to-standard determination condition.
Preferably, whether the calibration of the preset calibration slot reaches the standard or not is judged according to the theoretical barycentric coordinate, the current barycentric coordinate and a preset calibration standard-reaching judgment condition,
according to the formula five
Error D of the actual barycentric coordinates is obtained, where xs1For the abscissa, y, of the first calibration slot or the second calibration slot to be calibrated this times1For the ordinate, D, of the first calibration slot or second calibration slot being calibrated this timethdIs a preset allowable error value; when D is present<DthdWhen the actual barycentric coordinate error D is less than the preset allowable error value DthdThe calibration is up to standard, when D is more than or equal to DthdWhen the error D of the actual barycentric coordinates is equal to or greater than the preset allowable error value DthdAnd the calibration does not reach the standard.
D in the examples of the present inventionthdRepresenting the preset allowable error value of the measurement precision grade based on the scale (for example, the calibration division number is four-grade scale between one hundred and one thousand, three-grade scale between one thousand and one ten thousand, two-grade scale between ten thousand and one hundred thousand, more than one hundred thousand is one grade), DthdIs a positive number. For example, if the measuring accuracy grade of the scale is four, D isthdSet to 0.3, if the measuring precision grade of the scale is one grade, D is setthdSet to 0.05.
In step S105, when the calibration of the preset calibration slot does not reach the standard, the trimming factor is adjusted according to the preset calibration mode, and the step of obtaining the current barycentric coordinate of the scale to be calibrated in the preset coordinate system is skipped until the calibration of the preset calibration slot reaches the standard, and when the calibration of the preset calibration slot reaches the standard, the next selected calibration slot is received.
In the embodiment of the present invention, it is preferable that the calibration slots include a first calibration slot and four second calibration slots, and the next selected calibration slot refers to any one of the calibration slots which is not calibrated. As an example, the first calibration slot is selected as the preset calibration slot, that is, the first calibration is to calibrate the first calibration slot, after the calibration of the first calibration slot is completed, the next selected calibration slot is any one of the second calibration slots, and similarly, after the calibration of the second calibration slot is completed, the next selected calibration slot is any one of the three second calibration slots which are not calibrated, and the calibration is performed by sequentially selecting one calibration slot which is not calibrated, so that each calibration slot can be calibrated, the condition of missed detection is prevented, and a more accurate acquisition algorithm of the current barycentric coordinate can be obtained. Preferably, the correction mode is preset based on the error magnitude, for example, if D and DthdIf the difference is less than 0.5, fhAnd fvThe amplitude of each adjustment is 0.03 if D and DthdIf the difference is greater than 0.5, fhAnd fvThe amplitude of each adjustment is 0.05, thereby simplifying the adjustment process of adjusting the trimming factor.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (12)
1. A center of gravity correcting device for a scale, comprising:
the calibration plate is overlapped and stacked on the scale to be calibrated, the shape and the size of the calibration plate are consistent with those of the scale to be calibrated, a first calibration groove is formed in the geometric center of the calibration plate, and the scale to be calibrated is provided with four weighing sensors which are circumferentially distributed around the geometric center of the scale to be calibrated;
the first calibration groove is used for calibrating the pressure applying position of the balancing weight;
a light rope connected with the counterweight block; and
and the moving mechanism drives the light rope to move along the horizontal or vertical direction.
2. The device of claim 1, wherein the weight comprises:
a head part attached to the edge line of the notch of the first calibration slot; and
the head part is fixedly connected with the main body.
3. The device of claim 2, wherein the head is spherical or conical.
4. The device according to claim 1, wherein the calibration plate is further provided with a plurality of second calibration grooves uniformly distributed circumferentially around the geometric center thereof for calibrating the pressing position of the weight block.
5. A scale calibration method based on the gravity center calibration apparatus according to any one of claims 1 to 4, comprising:
placing a balancing weight on a currently selected calibration groove of a calibration plate to apply pressure to the calibration plate to obtain four weight indication values of four weighing sensors on a scale to be corrected;
acquiring a theoretical gravity center coordinate of the scale to be corrected in a preset coordinate system after being pressed according to the four weight indication values and a preset theoretical gravity center acquisition algorithm;
acquiring the current barycentric coordinate of the scale to be corrected in the preset coordinate system according to the four weight indicating values and a preset trimming factor of the scale to be corrected;
judging whether the current calibration of a preset calibration slot reaches the standard or not according to the theoretical barycentric coordinate, the current barycentric coordinate and a preset calibration standard judgment condition;
when the current calibration of the preset calibration slot is not up to the standard, the trimming factor is adjusted according to a preset correction mode, the step of obtaining the current barycentric coordinate of the scale to be corrected in the preset coordinate system is skipped until the calibration of the preset calibration slot is up to the standard, and when the current calibration of the preset calibration slot is up to the standard, the next selected calibration slot is received.
6. The method of claim 5, wherein the step of placing a weight on the calibration slot of the calibration plate is preceded by:
and superposing the calibration plates on a scale to be corrected.
7. The method of claim 5,
the calibration groove comprises a first calibration groove and/or a plurality of second calibration grooves, the first calibration groove is located at the geometric center of the calibration plate, and the second calibration grooves are circumferentially and uniformly distributed around the geometric center of the calibration plate.
8. The method according to claim 5, wherein the step of obtaining the coordinates of the theoretical center of gravity in the predetermined coordinate system after the scale to be corrected is pressed according to the four weight indicators and a predetermined algorithm for obtaining the theoretical center of gravity comprises:
according to the formula one
Acquiring the abscissa x of the theoretical barycentric coordinatec1According to the formula two
Acquiring the ordinate y of the theoretical barycentric coordinatec1Wherein w is1、w2、w3、w4Representing four weight indications in one-to-one correspondence with four load cells, w representingThe length of the scale to be corrected is h, and the width of the scale to be corrected is represented by h.
9. The method according to claim 5, wherein the step of obtaining the current barycentric coordinate of the scale to be corrected in the preset coordinate system according to the four weight indication values and the preset trimming factor of the scale to be corrected comprises:
according to the formula three
Acquiring the abscissa x of the current barycentric coordinatec2According to the formula four
Obtaining the ordinate y of the actual barycentric coordinatec2Wherein w is1、w2、w3、w4Representing four weight indications corresponding to the four weighing sensors one to one; f. ofhRepresenting a predetermined x-axis direction center of gravity deviation adjustment factor, fvAnd the gravity center deviation adjustment factor in the y-axis direction is preset, w represents the length of the scale to be corrected, and h represents the width of the scale to be corrected.
10. The method of claim 7, wherein the step of determining whether the calibration of the preset calibration slot is up to standard according to the theoretical barycentric coordinate, the current barycentric coordinate and a preset calibration up-to-standard determination condition comprises:
according to the formula five
Error D of the actual barycentric coordinates is obtained, where xs1For the abscissa, y, of the first calibration slot or the second calibration slot being calibrated this times1For the ordinate, D, of the first calibration slot or the second calibration slot being calibrated this timethdIs a preset allowable error value; when D is present<DthdThe error D of the actual barycentric coordinates is smaller thanPredetermined allowable error value DthdThe calibration is up to standard, when D is more than or equal to DthdWhen the actual barycentric coordinate error D is equal to or greater than the preset allowable error value DthdAnd the calibration does not reach the standard.
11. The method of claim 5, wherein the calibration plate is rectangular and the predetermined coordinate system is based on a geometric center of the calibration plate, an x-axis direction parallel to a length of the calibration plate, and a y-axis direction parallel to a width of the calibration plate.
12. The method of claim 5, wherein the step of placing a weight on a currently selected calibration slot on the calibration plate comprises:
and moving the light rope and the balancing weight connected with the light rope to the position right above the currently selected calibration groove through a moving mechanism, and releasing the light rope to enable the balancing weight to apply pressure to the calibration plate.
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