CN110823438B - Method for detecting torque value of torque control device - Google Patents
Method for detecting torque value of torque control device Download PDFInfo
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- CN110823438B CN110823438B CN201911152499.7A CN201911152499A CN110823438B CN 110823438 B CN110823438 B CN 110823438B CN 201911152499 A CN201911152499 A CN 201911152499A CN 110823438 B CN110823438 B CN 110823438B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
Abstract
The invention discloses a method for detecting a torque value of a torque control device, which comprises the following steps: s1, selecting a detection point; s2: the torque control device is horizontally or vertically arranged according to requirements; s3, coaxially and serially connecting a torsion shaft of the detected torque control device with a measuring shaft of a standard torque meter; s4, pre-adding torque and adjusting zero position; s5, gradually increasing the torque applied to the detection point, and recording the torque value of the detected torque control device with the standard torque meter as the standard; and S6, calculating the relative error and repeatability of the torque value. By the method, the problem that the torque detection calculation result is unreliable is solved.
Description
Technical Field
The invention relates to the field of torque measurement, in particular to a method for detecting a torque value of a torque control device.
Background
The torque control device is mainly used for fastening bolts, nuts or screws, and can measure or control the torque value during tightening so as to achieve the purpose of indirectly controlling the consistency of the fastening axial force of the connecting bolts or screws between solids. On an assembly line with strict requirements on a tightening process, the torque value of each fastener of a product is consistent or meets the specific fastening requirement, the quality of the product is also greatly guaranteed, and the torque control device is required to be detected in order to ensure the accuracy of the torque control device. The torque control device works by the principle of torque balance and is generally divided into a value indicating type and a preset type according to the structure, wherein the value indicating type can be divided into a pointer type and a digital type, and the preset type can be divided into a scale adjustable type and a fixed value type. At present, a manual detection method for a torque control device generally reads a measured value on a standard torque meter based on a set value of the detected torque control device, but if the set value of the detected torque control device has a large error or is damaged, a detection calculation result is unreliable.
Disclosure of Invention
Technical problem to be solved
In view of the above problems, the present invention provides a method for detecting a torque value of a torque control device, which improves the reliability of detection.
(II) technical scheme
In view of the above technical problem, the present invention provides a method for detecting a torque value of a torque control device, the method comprising:
s1, selecting at least 3 detection points, wherein the detection points at least comprise 20%, 60% and 100% of the upper limit of torque measurement;
s2, placing the torque control device to be tested at a required position horizontally or vertically according to requirements;
s3, coaxially and serially connecting a torsion shaft of the detected torque control device, a torque multiplier and a measuring shaft of a standard torquemeter;
s4, pre-applying the maximum torque for 3 times to the detected torque control device according to the using direction, and respectively adjusting the zero positions indicated by the standard torque meter and the detected torque control device after pre-twisting;
s5, steadily increasing the applied torque to the detection point step by step, taking a standard torquemeter as a standard, recording the torque value of each point of the detected torque control device, continuously performing the step for n times, wherein n is not less than 3, and readjusting the zero position each time;
s6, calculating the relative error and repeatability of the torque value according to the reading, wherein the relative error and repeatability are respectively as follows:
in the formula (I), the compound is shown in the specification,
the arithmetic mean value of the torque values of the torque control device checked at each detection point n times, M is the standard torque value of the standard torque meter at each detection pointmaxAnd MminThe torque values of the torque control device detected at each detection point are respectively the maximum value and the minimum value, k is the magnification of the torque multiplier, and k is 1 when the torque multiplier is not used.
Further, when the torque control device is placed horizontally in step S2, the detected torque control device should be kept horizontal, and the horizontal offset angle should not be greater than 3 °; when the torque control device is placed vertically as described in step S2, the torque control device to be tested should be kept perpendicular to the ground surface, and the vertical offset angle should not be greater than 3 °.
Further, when the torque control device is placed horizontally or vertically as described in step S2, the load direction should be kept perpendicular to the hand axis of the torque control device to be tested, and the offset angle should be no greater than 10 °.
Further, in step S3, the torsion axis of the torque control device to be tested, the torque multiplier, and the measurement axis of the reference torque meter are coaxially connected in series.
Further, the maximum torque is pre-applied 3 times in step S4, the return-to-zero of the detected torque control device should be visually checked at least 10S after unloading, and the return-to-zero error is calculated as:
in the formula, m0For the return-to-zero value of the torque control device to be checked, MsFor the upper limit of the measurement of the torque control device to be tested, the return-to-zero error should satisfy: maximum return to zero error ± (0.1 × standard degree scale)% FS.
Further, the allowable ranges of the relative error and repeatability of the torque values described in step S6 are related to the standard degree grade, and respectively satisfy the following conditions:
the maximum value of the relative error of the torque values is on the order of ± degrees of standard,
the maximum value of the repeatability of the torque value is on the standard degree scale%.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
(1) the torque value of the standard torque meter is used as the standard instead of the set value of the detected torque control device, the reliability of the standard torque meter is better, the accuracy is higher, and the standard torque meter is more suitable to be used as the standard reference;
(2) according to the invention, a horizontal or vertical placing method is provided for different required positions, and the placing offset angle is limited, so that the torque measurement value is more accurate;
(3) the invention limits the angle of the load direction, so that the torque measurement value can accurately reflect the actual torque value as much as possible, and the accuracy of the torque measurement is improved;
(4) the invention carries out pre-applied torque, adjusts the zero return of the torque control device to be detected, leads the detection result of each time to be more accurate, and detects the zero return error to ensure the reliability of the torque control device to be detected;
(5) the invention selects a plurality of detection points in the full measurement range, and measures each detection point for a plurality of times and takes the average value of the detection points, thereby improving the reliability of the detection result.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a schematic flow chart illustrating a method for detecting a torque control device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a torque control device according to an embodiment of the present invention in a horizontal test state;
FIG. 3 is a schematic diagram of a torque control device in a vertical test mode according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention discloses a method for detecting a torque value of a torque control device, which comprises the following steps of:
s1, selecting 5 detection points, wherein the measurement range of the detected torque control device applicable to the method is 20% -100% of the upper measurement limit, and therefore the detection points at least comprise 20%, 40%, 60%, 80% and 100% of the upper torque measurement limit;
s2, horizontally or vertically placing the torque control device to be detected at a required position according to the requirement, as shown in figures 2 and 3, wherein a is line contact, and the loading point is the middle part of the handle holding position;
in order to ensure the accuracy of torque measurement, when the tested torque control device is in a horizontal test state, as shown in fig. 2, the tested torque control device should be kept horizontal, and the horizontal offset angle should not be larger than 3 °; when the torque control device to be tested is in a vertical test state, as shown in fig. 3, the torque control device to be tested should be kept perpendicular to the ground direction, and the vertical offset angle should not be greater than 3 °, and no matter the torque control device to be tested is in a horizontal test state or a vertical test state, the load direction should be kept perpendicular to the hand axis of the torque control device to be tested, and the offset angle should not be greater than 10 °;
s3, coaxially connecting the torsion shaft of the detected torque control device with the measuring shaft of the standard torque meter in series, and if a torque multiplier exists, coaxially connecting the torsion shaft of the detected torque control device, the torque multiplier and the measuring shaft of the standard torque meter in series;
s4, pre-applying the maximum torque for 3 times to the detected torque control device according to the using direction, and respectively adjusting the zero positions indicated by the standard torque meter and the detected torque control device after pre-twisting;
after pre-applying the maximum torque for 3 times and 15s, visually checking the zero return of the detected torque control device, and calculating to obtain a zero return error as follows:
in the formula, m0For the return-to-zero value of the torque control device to be checked, MsFor the upper limit of the measurement of the torque control device to be tested, the return-to-zero error should satisfy: maximum return-to-zero error ± (0.1 × standard degree scale)% FS;
s5, steadily increasing the applied torque to the detection point step by step, taking a standard torquemeter as a standard, recording the torque value of each point of the detected torque control device, continuously performing the step for 3 times, readjusting the zero position each time, and carrying out detection on the detected torque control device with a driven pointer each time, wherein the driven pointer is required to be carried in each detection;
s6, calculating the relative error and repeatability of the torque value according to the reading, wherein the relative error and repeatability are respectively as follows:
wherein M is the arithmetic mean of the 3 times torque values of the torque control device detected at each detection point, M is the standard torque value of the standard torque meter at each detection point, and M is the standard torque value of the standard torque meter at each detection pointmaxAnd MminThe torque values of the torque control device detected at each detection point are respectively the maximum value and the minimum value, k is the magnification factor of the torque multiplier, and k is 1 when the torque multiplier is not used;
the relative error of the torque value and the allowable range of repeatability are related to the standard degree grade, and respectively satisfy the following conditions:
the maximum value of the relative error of the torque values is on the order of ± degrees of standard,
the maximum value of the repeatability of the torque value is on the standard degree scale%.
In summary, the method for detecting the torque value of the torque control device has the following advantages:
(1) the torque value of the standard torque meter is used as the standard instead of the set value of the detected torque control device, the reliability of the standard torque meter is better, the accuracy is higher, and the standard torque meter is more suitable to be used as the standard reference;
(2) according to the invention, a horizontal or vertical placing method is provided for different required positions, and the placing offset angle is limited, so that the torque measurement value is more accurate;
(3) the invention limits the angle of the load direction, so that the torque measurement value can accurately reflect the actual torque value as much as possible, and the accuracy of the torque measurement is improved;
(4) the invention carries out pre-applied torque, adjusts the zero return of the torque control device to be detected, leads the detection result of each time to be more accurate, and detects the zero return error to ensure the reliability of the torque control device to be detected;
(5) the invention selects a plurality of detection points in the full measurement range, and measures each detection point for a plurality of times and takes the average value of the detection points, thereby improving the reliability of the detection result.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (2)
1. A method of detecting a torque value of a torque control apparatus, characterized by comprising the steps of:
s1, selecting at least 3 detection points, wherein the detection points at least comprise 20%, 60% and 100% of the upper limit of torque measurement;
s2, placing the torque control device to be tested at a required position horizontally or vertically according to requirements; when the device is placed horizontally, the torque control device to be detected should be kept horizontal, and the horizontal offset angle should not be larger than 3 degrees; when the torque control device is vertically placed, the torque control device to be detected is kept vertical to the ground, and the vertical offset angle is not more than 3 degrees; when the device is placed horizontally or vertically, the load direction is vertical to the hand axis of the torque control device to be detected, and the offset angle is not more than 10 degrees;
s3, coaxially and serially connecting a torsion shaft of the detected torque control device, a torque multiplier and a measuring shaft of a standard torquemeter;
s4, pre-applying the maximum torque for 3 times to the detected torque control device according to the using direction, and respectively adjusting the zero positions indicated by the standard torque meter and the detected torque control device after pre-twisting;
the maximum torque is pre-applied for 3 times in step S4, the return-to-zero of the detected torque control device should be checked visually after at least 10S after unloading, and the return-to-zero error is calculated as:
in the formula, m0For the return-to-zero value of the torque control device to be checked, MsFor the upper limit of the measurement of the torque control device to be tested, the return-to-zero error should satisfy: maximum return-to-zero error ± (0.1 × standard degree scale)% FS;
s5, steadily increasing the applied torque to the detection point step by step, taking a standard torquemeter as a standard, recording the torque value of each point of the detected torque control device, continuously performing the step for n times, wherein n is not less than 3, and readjusting the zero position each time;
s6, calculating the relative error and repeatability of the torque value according to the reading, wherein the relative error and repeatability are respectively as follows:
in the formula (I), the compound is shown in the specification,
the arithmetic mean value of the torque values of the torque control device checked at each detection point n times, M is the standard torque value of the standard torque meter at each detection pointmaxAnd MminThe torque values of the torque control device detected at each detection point are respectively the maximum value and the minimum value, k is the magnification of the torque multiplier, and k is 1 when the torque multiplier is not used.
2. The method for detecting a torque value of a torque control device according to claim 1, wherein the allowable ranges of relative error and repeatability of the torque value in step S6 are related to a standard degree, and satisfy:
the maximum value of the relative error of the torque values is on the order of ± degrees of standard,
the maximum value of the repeatability of the torque value is on the standard degree scale%.
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