CN114264405B - Large-torque sensor calibration device and calibration method thereof - Google Patents
Large-torque sensor calibration device and calibration method thereof Download PDFInfo
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- CN114264405B CN114264405B CN202111627143.1A CN202111627143A CN114264405B CN 114264405 B CN114264405 B CN 114264405B CN 202111627143 A CN202111627143 A CN 202111627143A CN 114264405 B CN114264405 B CN 114264405B
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Abstract
The invention provides a large torque sensor calibration device which comprises a bracket, a moment plate, a force arm rod, a coupler, a torque sensor, a pressure sensor and an oil cylinder Meter Value T output corresponding to torque sensor Output of And calibrating the torque sensor. After the length of the force arm is determined, continuous loading is realized only by adjusting the oil pressure, and torque calibration is completed. The dual regulation mode has been designed, and on the one hand when adjusting that the oil pressure can't be accurate to a certain value, the mode that another party's accessible increased or reduced the weight on the support is to finely tuning the moment of torsion to reduce the moment of torsion calibration error.
Description
Technical Field
The invention relates to the technical field of torque calibration, in particular to a large torque sensor calibration device and a calibration method thereof.
Background
In the power transmission of a mechanical rotating mechanism, a torque sensor is often required to accurately measure the transmitted torque. The torque sensor can convert the torque into an electric signal, so that the torque value is indirectly obtained through the electric signal. To obtain an accurate torque value, it is necessary to ensure that the torque sensor used has high measurement accuracy. Calibration is necessary before use, and also periodically during use, in order to ascertain the accuracy of the torque sensor measurements. The traditional torque sensor calibration method is to compare the actual display numerical value of the torque sensor by using a standard weight and a standard lever, and is generally used for calibrating the torque value below 5 kN.m. When the torque value of a larger range is calibrated, a method of only loading weights cannot be used, and usually the method is calculated according to a calibration value of 5 kN.m, so that the larger the range is, the larger the error is, the torque value output by the torque sensor during actual use is directly influenced. In the industry of low-speed large-torque permanent magnet direct drive motors, the torque design is different from thousands to hundreds of thousands of newton-meters, a torque sensor is particularly common as a detection device, and the accuracy of production and test is directly influenced, so that the torque sensor needs to be calibrated regularly. The operation is complicated, the labor intensity is high, the operation is unsafe, and calibration errors can be generated.
Disclosure of Invention
In order to solve the technical problems, the invention provides a large torque sensor calibration device on one hand, which comprises a support, a torque plate, a force arm rod, a coupler, a torque sensor, a pressure sensor and an oil cylinder, wherein the support comprises a first support, a second support, a third support, a fourth support and a fifth support, the first support, the second support and the fifth support are floor supports, the torque sensor is arranged on the fifth support, the third support and the fourth support are suspended supports, and weights can be suspended on the third support.
Furthermore, the moment plates comprise a front moment plate and a rear moment plate, the number of the front moment plate and the number of the rear moment plate are two, a plurality of round holes distributed on the same circumference are formed in the positions, corresponding to the two moment plates of each group, and the two moment plates of each group are connected through round holes distributed on the same circumference in a penetrating mode through a pin shaft.
Furthermore, the torque sensor is fixed on the fifth support through a bolt, one side of the torque sensor is connected with the coupler, and the other side of the torque sensor is connected with the rear torque plate.
Furthermore, one end of the coupler is connected with the torque sensor, and the other end of the coupler is connected with the front torque plate.
Furthermore, four sets of four arm levers are correspondingly connected between the support and the moment plate, one end of each arm lever is hinged with the corresponding support, the other end of each arm lever is hinged with the corresponding moment plate, and each arm lever forms a triangular support.
Further, a pressure sensor is arranged below the fourth support and connected with the oil cylinder, an oil inlet is formed in the lower portion of the oil cylinder, an oil outlet is formed in the upper portion of the oil cylinder, and hydraulic oil pushes a piston of the oil cylinder to apply force to a force arm rod on the fourth support.
The invention also provides a large torque sensor calibration method, which comprises the following steps: s1: the large-torque sensor calibration device comprises a support, a torque plate, a force arm rod, a coupler, a torque sensor, a pressure sensor and an oil cylinder, wherein after the components are mounted, the first support, the second support and the fifth support are fixed on a test platform.
S2: and in a free state, adjusting the bolt and the pin shaft to ensure that the readings of the pressure sensor and the torque sensor are zero.
S3: the radius R of the inner wall of the oil cylinder is determined through calculation, the length L 'of the force arm is measured, the length L' of the force arm is determined, the pressure P applied to the oil cylinder by the hydraulic station is adjusted, and the torque T is calculated Meter =PπR 2 L, heavyThe duplication step calculates five sets of data at different oil pressures.
S4: respectively calculating the actual torque T in the five groups of data in the step 3 Meter =PπR 2 L and the value T of the torque sensor corresponding output Output of And comparing to calculate errors and calibrating the torque sensor.
In the method, the length L of the force arm is in direct proportion to the maximum calibration torque T of the torque sensor and in inverse proportion to the applied oil pressure F, namely T = L.F, so that the torque can be adjusted by adjusting the oil pressure when the length of the force arm is fixed, and if the oil pressure F cannot be adjusted to a set value, the torque can be finely adjusted by adding or reducing weights on the third support.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. after the length of the force arm rod is determined, continuous loading is realized only by adjusting the oil pressure, and torque calibration is completed.
2. According to the invention, a double adjusting mode is designed, on one hand, when the oil pressure can not be adjusted to a certain value, on the other hand, the torque can be finely adjusted by adding or reducing weights on the fourth support, so that the torque calibration error is reduced.
3. The invention designs that the front and rear torque plates are respectively connected through a circle of pin shafts along the circumferential direction, so that the use amount of steel plates can be saved on the premise of not reducing the strength.
4. The invention designs that each force arm rod is hinged with the moment plate and the bracket by the pin shaft, and triangular supports are formed on the front, the back, the left and the right sides of the force arm rod, so that the force arm rod is only influenced by pushing force or pulling force but not bending moment, and particularly for calibrating a large-torque sensor, the structural stability is ensured, and materials are saved.
Drawings
The above and other objects and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like or similar elements are designated by like reference numerals.
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 left side view of the invention.
Description of the reference symbols: 11-a first support, 12-a second support, 13-a third support, 14-a fourth support, 15-a fifth support, 21-a front moment plate, 22-a rear moment plate, 3-a force arm rod, 4-a coupler, 5-a torque sensor, 6-a pressure sensor, 7-an oil cylinder and 8-a weight.
Detailed Description
The present invention will be described in further detail with reference to examples. The advantages and features of the present invention will become more apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Terms such as "comprising" and "comprises" mean that, in addition to having components which are directly and explicitly stated in the description and claims, the solution of the invention does not exclude other components which are not directly or explicitly stated.
In the description herein, directional terms such as "upper", "lower", "front", "rear", etc. are used, it being understood that these directional terms are relative concepts that are used for relative positional description and clarification, and that the particular orientation of the corresponding belt conveyor may vary accordingly as the orientation of the belt conveyor changes.
As shown in fig. 1, on one hand, the invention provides a calibration device for a large torque sensor 5, which includes a support, a torque plate, a force arm 3, a coupler 4, a torque sensor 5, a pressure sensor 6, and an oil cylinder 7, where the support includes a first support 11, a second support 12, a third support 13, a fourth support 14, and a fifth support 15, where the first support 11, the second support 12, and the fifth support 15 are floor supports, the torque sensor 5 is disposed on the fifth support 15, the third support 13 and the fourth support 14 are suspension supports, and a weight 8 may be suspended on the third support 13. In the embodiment, after the length of the arm lever 3 is determined, continuous loading is realized only by adjusting the oil pressure, and torque calibration is completed. The dual regulation mode has been designed, and on the one hand when adjusting that the oil pressure can't be accurate to a certain value, the other party accessible increases or reduces the mode of weight 8 on third support 13 to finely tune the moment of torsion to reduce the moment of torsion calibration error.
In this embodiment, the moment plate includes preceding moment plate 21 and back moment plate 22, preceding moment plate 21 and back moment plate 22 are a pair of, every is provided with a plurality of round holes that distribute on same circumference to moment plate corresponding position, pass the round hole that distributes on same circumference through the round pin axle between every to the moment plate and connect. The technical purpose is as follows: the moment plates are connected through a circle of pin shafts along the circumferential direction, and the use amount of steel plates can be saved on the premise of not reducing the strength.
In this embodiment, torque sensor 5 passes through the bolt fastening on fifth support 15, torque sensor 5 one side is connected with shaft coupling 4, and the opposite side is connected with back moment board 22, 4 one end of shaft coupling are connected with torque sensor 5, and the other end is connected with preceding moment board 21.
In this embodiment, arm of force lever 3 has four of four groups of arm of force levers, and the correspondence is connected between support and moment board, every group arm of force lever one end is articulated with the support that corresponds respectively, and the other end is articulated with the moment board that corresponds, and every group arm of force lever all forms a triangle-shaped and supports. The technical purpose is as follows: each arm lever is hinged with the moment plate and the support through pin shafts, triangular supports are formed on the front side, the rear side, the left side and the right side of each arm lever, the arm levers 3 are only affected by pushing force or pulling force but not bending moment, and particularly for calibrating the large-torque sensor 5, the structural stability is guaranteed, and materials are saved.
In this embodiment, a pressure sensor 6 is arranged below the fourth support 14, the pressure sensor 6 is connected with an oil cylinder 7, an oil inlet is arranged below the oil cylinder 7, an oil outlet is arranged above the oil cylinder 7, hydraulic oil pushes a piston of the oil cylinder to apply force to the force arm rod 3 on the fourth support 14, and torque can be adjusted by adjusting the oil pressure. In this embodiment, in a free state, the bolts and the pins in the device of the present invention are adjusted to ensure that the readings of the pressure sensor 6 and the torque sensor 5 are zero, and the technical purpose is to ensure that the torque sensor is not affected by an external force when being corrected, and ensure the accuracy of calibration.
Another aspect of the present invention provides a method for calibrating a large torque sensor 5, comprising the steps of:
s1: the calibration device for the large torque sensor 5 comprises a support, a moment plate, a force arm rod 3, a coupler 4, a torque sensor 5, a pressure sensor 6 and an oil cylinder 7, wherein after the components are installed, the first support 11, the second support 12 and the fifth support 15 are fixed on a test platform.
S2: in the free state, the bolts and the pins are adjusted to ensure that the readings of the pressure sensor 6 and the torque sensor 5 are zero.
S3: the radius R of the inner wall of the oil cylinder 7 is determined through calculation, the length L' of the force arm rod 3 is measured, the length L of the force arm is determined, the pressure P exerted on the oil cylinder by the hydraulic station is adjusted, and therefore the torque T is calculated Meter for measuring =PπR 2 And L, repeating the step to calculate five groups of data under different oil pressures.
S4: respectively calculating the actual torque T in the five groups of data in the step 3 Meter =PπR 2 L and the value T of the corresponding output of the torque sensor Output of And comparing to calculate errors and calibrating the torque sensor.
In this embodiment, the radius R =0.08m of the inner wall of the cylinder 7, the length L' =1.32m of the arm lever 3, the arm L =1.6m is calculated, and the rated output value of the torque sensor is calculated according to the formula T = P pi R 2 L calculating the pressure P applied by the oil cylinder, wherein the output values are respectively selected from 60kN m,120kN m,180kN m,240kN m and 300kN m, and the pressure P is obtained by the formula T = P pi R 2 L calculates a group of corresponding P values, adjusts the hydraulic station to apply force to the oil cylinder 7 on the large-torque sensor calibration device according to the calculated P values, and adjusts the force according to a formula T Meter =P*π0.08 2 *1.6 to obtain T Meter for measuring At this time, the value T outputted by the torque sensor 5 is compared Output of And comparing the data with the data to calculate an error, and calibrating the torque sensor 5.
In the method, the arm length L can be calculated according to the measured length L' of the arm, the arm length L is directly proportional to the maximum calibration torque T of the torque sensor 5 and inversely proportional to the applied oil pressure F, i.e., T = l.f, so that the torque can be adjusted by adjusting the oil pressure at a certain time when the arm length is constant, and the torque can be finely adjusted by adding or reducing the weight 8 at the other side if the oil pressure F cannot be adjusted to a set value.
In the present embodiment, the nominal output values of five sets of torque sensors are selected according to the algorithm T = P x R 2 * L determines five sets of values of P, in this embodiment, in order to ensure the accuracy of the test, the five sets of output values are selected as 60kN · m,120kN · m,180kN · m,240kN · m, and 300kN · m, or more sets of output values can be selected as the basis for comparison according to actual situations, and the more values are selected, the more accurate the calibration of the torque sensor is.
The embodiments in the above embodiments can be further combined or replaced, and the embodiments are only used for describing the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various changes and modifications made to the technical solution of the present invention by those skilled in the art without departing from the design idea of the present invention belong to the protection scope of the present invention.
Claims (3)
1. The utility model provides a big torque sensor calibration device, includes support, moment board, arm of force pole, shaft coupling, torque sensor, pressure sensor and hydro-cylinder, its characterized in that: the support comprises a first support, a second support, a third support, a fourth support and a fifth support, wherein the first support, the second support and the fifth support are floor supports, the torque sensor is arranged on the fifth support, the third support and the fourth support are suspended supports, and weights can be suspended on the third support; the torque plates comprise a front torque plate and a rear torque plate, the number of the front torque plate and the number of the rear torque plate are two, a plurality of round holes distributed on the same circumference are formed in the corresponding positions of the two torque plates in each group, and the two torque plates in each group are connected through round holes distributed on the same circumference in a penetrating manner through pin shafts; the torque sensor is fixed on the fifth bracket through a bolt, one side of the torque sensor is connected with the coupler, and the other side of the torque sensor is connected with the rear torque plate; one end of the coupler is connected with the torque sensor, and the other end of the coupler is connected with the front torque plate; four sets of four arm levers are correspondingly connected between the bracket and the moment plate, one end of each arm lever is hinged with the corresponding bracket, the other end of each arm lever is hinged with the corresponding moment plate, and each arm lever forms a triangular support; and a pressure sensor is arranged below the fourth support and connected with the oil cylinder, an oil inlet is formed below the oil cylinder, an oil outlet is formed above the oil cylinder, and hydraulic oil pushes a piston of the oil cylinder to apply force to a force arm rod on the fourth support.
2. A large torque sensor calibration method comprises the following steps: s1: the large torque sensor calibration device according to claim 1 is adopted, and comprises a support, a torque plate, a force arm rod, a coupler, a torque sensor, a pressure sensor and an oil cylinder, wherein after the components are mounted, the first support, the second support and the fifth support are fixed on a test platform; s2: in a free state, adjusting the bolt and the pin shaft to ensure that the readings of the pressure sensor and the torque sensor are zero; s3: the radius R of the inner wall of the oil cylinder is determined through calculation, the length L 'of the force arm is measured, the length L' of the force arm is determined, the pressure P applied to the oil cylinder by the hydraulic station is adjusted, and the torque T is calculated Meter =PπR 2 L, repeating the step to calculate five groups of data under different oil pressures; s4: respectively calculating the actual torque T in the five groups of data in the step 3 Meter for measuring =PπR 2 L and the value T of the torque sensor corresponding output Output of And comparing to calculate errors and calibrating the torque sensor.
3. The large torque sensor calibration method according to claim 2, wherein: the length L of the force arm is in direct proportion to the maximum calibration torque T of the torque sensor and in inverse proportion to the applied oil pressure F, namely T = L.F, so that the torque can be adjusted by adjusting the oil pressure at a certain length of the force arm, and if the oil pressure F cannot be adjusted to a set value, the torque can be finely adjusted by increasing or reducing weights on the third support.
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