CN107449550B - Device and method suitable for calibrating multiple groups of torque sensors - Google Patents
Device and method suitable for calibrating multiple groups of torque sensors Download PDFInfo
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- CN107449550B CN107449550B CN201710638967.6A CN201710638967A CN107449550B CN 107449550 B CN107449550 B CN 107449550B CN 201710638967 A CN201710638967 A CN 201710638967A CN 107449550 B CN107449550 B CN 107449550B
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- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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Abstract
The invention discloses a device suitable for calibrating a plurality of groups of torque sensors, which comprises an installation base, a torque sensor loading sliding group, a calibrating device torque transmission assembly, a torque sensor to be calibrated, a calibrating device tail bearing assembly, a computer and a mass block, wherein one end of the torque sensor to be calibrated is clamped on the calibrating device tail bearing assembly, the other end of the torque sensor to be calibrated is connected with the calibrating device torque transmission assembly, the calibrating device torque transmission assembly is connected with the torque sensor loading sliding group, and the mass block is positioned on the torque sensor loading sliding group. Compared with the traditional torque sensor, the torque sensor has powerful functions, can simultaneously meet the calibration of the force values of the torque sensors with various specifications, can quickly replace the torque sensors with different specifications and the corresponding transition shaft sleeves and sleeves thereof by the front-back sliding of the tail flange sleeve mounting frame along the guide rail, is simple and convenient, and saves certain time.
Description
Technical Field
The invention relates to a device and a method suitable for calibrating a plurality of groups of torque sensors, and belongs to the technical field of torque calibration.
Background
At present, torque is increasingly used as an important parameter for evaluating the working capacity, energy consumption, service life, efficiency and safety of mechanical power equipment, and becomes an indispensable content for mechanical product development and research, test analysis, quality control and the like. Therefore, the torque measurement value is accurate and reliable, and the method is very important for ensuring the quality of products.
The torque calibration device is an important instrument for testing the accuracy of the torque sensor, and any torque sensor can be normally used only after being calibrated. At present, most of the most common torque sensor calibration devices have single function and can only calibrate one torque sensor; the most common torque calibration mode is weight calibration, and the calibration of different ranges of a torque sensor is met by suspending weights with different masses. If a plurality of groups of torque sensors with different measuring ranges need to be calibrated, a plurality of calibration devices with different sizes need to be made, so that the calibration cost is greatly increased; meanwhile, the calibration weights are placed back and forth, and certain time is wasted.
Chinese patent 201521005817.4 discloses a torque sensor calibration device, which includes a mounting base, a loading long arm, a long arm mounting seat, a weight tray, a torque sensor to be calibrated, a leveling short arm, a short arm mounting seat, a leveling cylinder, and the like; in the device, two ends of a measuring shaft of the torque sensor to be calibrated are respectively connected with a long arm connecting shaft and a short arm connecting shaft, and the calibration of the torque sensor can be realized by loading weights to the long arm and leveling the short arm by an air cylinder. The device is simple in function, can only calibrate aiming at a single torque sensor, calibrates by mounting calibration weights back and forth, and is low in efficiency and time-wasting.
Therefore, in order to reduce the calibration cost of a plurality of groups of torque sensors with different measuring ranges and improve the calibration efficiency of the torque sensors, a new device and a new calibration method which are simultaneously suitable for calibrating a plurality of groups of torque sensors need to be developed.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a device suitable for calibrating a plurality of groups of torque sensors and a calibration method.
The technical scheme is as follows: in order to solve the technical problems, the device suitable for calibrating the multiple groups of torque sensors comprises an installation base, a torque sensor loading sliding group, a calibrating device torque transmission assembly, a torque sensor to be calibrated, a calibrating device tail bearing assembly, a computer and a mass block, wherein one end of the torque sensor to be calibrated is clamped on the calibrating device tail bearing assembly, the other end of the torque sensor to be calibrated is connected with the calibrating device torque transmission assembly, the calibrating device torque transmission assembly is connected with the torque sensor loading sliding group, and the mass block is positioned on the torque sensor loading sliding group; the loading sliding set of the torque sensor comprises a torque sensor calibration plate, a servo motor, a lead screw nut and a first guide rail, wherein the servo motor is arranged on the torque sensor calibration plate, the servo motor is connected with the lead screw, the lead screw is sleeved with the lead screw nut, the lead screw nut is connected with a lead screw nut seat, the lead screw nut seat is connected with two first slide blocks, the first slide blocks are connected with a slide seat, a mass block is positioned on the slide seat, the two first slide blocks are respectively positioned on the first guide rail, the first guide rail is arranged on the torque sensor calibration plate, a magnetic grid ruler reading head is arranged on one side surface of the lead screw nut seat, a magnetic grid ruler matched with the magnetic grid ruler reading head for use is arranged on the torque sensor calibration plate, and the magnetic grid ruler reading head and the torque sensor to be calibrated are; the servo motor drives the screw rod to rotate, so that the screw rod nut seat is driven to move on the first guide rail, and the torque is acted on the torque sensor to be calibrated through the torque transmission assembly of the calibrating device.
Preferably, the torque sensor calibration plate is provided with a limit switch.
Preferably, the torque transmission assembly of the calibration device comprises a torque sensor calibration support, a calibration shaft and a transition shaft sleeve, one end of the transition shaft sleeve is connected with the torque sensor to be calibrated, the other end of the transition shaft sleeve is connected with the calibration shaft, the calibration shaft is mounted on the torque sensor calibration support through a bearing, and the calibration shaft is connected with the torque sensor calibration plate through a key.
Preferably, the tail bearing assembly of the calibration device comprises a second guide rail, a second sliding block, a flange sleeve mounting frame, a flange sleeve, a sleeve and a locking handle, wherein the second sliding block is mounted on the second guide rail; the flange sleeve is a step shaft and is arranged on the flange sleeve mounting frame through screws; the sleeve is an axle type part, and outside processing has external splines, and inside processing becomes double key groove through-hole, and the sleeve outside is connected with flange sleeve's spline fit, and inside is connected with waiting to mark torque sensor through the parallel key, and the locking handle passes through the screw thread and installs on flange sleeve mounting bracket.
The calibration method of the device suitable for calibrating multiple groups of torque sensors comprises the following steps:
1) after all parts are installed, a calibrated small-range torque sensor is selected to be installed at a torque sensor to be calibrated and installed in place, and the position of a tail bearing assembly of the calibration device is locked through a locking handle;
2) starting a servo motor, driving a sliding seat to move through a lead screw, stopping the movement when the sliding seat moves to a position of a limit switch, and marking the moment as a zero point of the device, wherein the position of the limit switch from the central line of a calibration shaft is determined by the calibration device, so that the position coordinate of the zero point from the central line of the calibration shaft is known; at the moment, the position of the reading head of the magnetic grid ruler is an initial position, the position of the screw nut seat is a zero position, the position of the sliding seat is a balance position, the numerical value of the torque sensor at the moment is recorded, and the torque value is the zero value of the calibration device;
3) the servo motor rotates reversely, the sliding seat moves reversely from a zero position, the moving distance X of the sliding seat is recorded in real time through a reading head of the magnetic grid ruler, the torque T in the process is recorded through a computer, and a T-X curve is generated; so as to obtain the torque value when the sliding seat moves to each specific coordinate;
4) the central line of the calibration shaft is taken as a reference, the positions of different mass blocks from the central line of the calibration shaft are different, so that the generated torques are different, the masses of the mass blocks and the screw can be accurately measured when each mass block is installed, and different torque values T' generated by each mass block at different positions can be calculated through the masses and the positions; therefore, the torque T at a certain position after the mass block is installedGeneral assemblyRecording a corresponding torque range which can be calibrated by the device after each mass block is installed by a computer;
5) selecting a proper transition shaft sleeve, a proper sleeve and a proper mass block according to the size specification of the torque sensor to be calibrated, respectively installing the transition shaft sleeve, the proper sleeve and the proper mass block to correct positions, and installing the torque sensor to be calibrated;
6) starting the servo motor, controlling the servo motor to move the sliding seat to a balance position (namely, zero torque), recording the position coordinate of the sliding seat by the computer, and recording the position coordinate as X from the central line of the calibration axis0The balance torque generated by the sliding seat and the mass block
Then, the torque T calibrated by the torque sensor for the first time is selected1The torque being simultaneously at position X by the slide and the mass1Generated by, i.e.
Calculating X by computer1Then the computer controls the servo motor to drive the sliding seat to move to the coordinate X in the direction away from the servo motor1Performing first calibration;
7) continuously selecting the torque T calibrated for the second time by the torque sensor2The torque being simultaneously at position X by the slide and the mass2Generated by the process, calculating X by computer2Then the computer controls the servo motor to make the sliding seat move to X with the mass block2Performing second calibration; continuously selecting the third to fifth calibrated torques T of the torque sensor in sequence3、T4、T5Respectively calculating corresponding coordinates X by a computer3、X4、X5Then the computer controls the servo motor to make the sliding seat respectively move to X with the mass block3、X4、X5And performing third to fifth calibration, and after the five torque values of the torque sensor are calibrated in sequence, returning the screw nut seat to the balance position again for the next calibration.
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) the servo motor drives the sliding seat and the mass block to move, the torque is ensured by controlling the position of the sliding seat, the traditional weight calibration is replaced, and the calibration efficiency is improved under the condition of ensuring the calibration precision.
(2) Compared with the traditional torque sensor, the torque sensor has powerful functions, can simultaneously meet the calibration of the force values of the torque sensors with various specifications, can quickly replace the torque sensors with different specifications and the corresponding transition shaft sleeves and sleeves thereof by the front-back sliding of the tail flange sleeve mounting frame along the guide rail, is simple and convenient, and saves certain time.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
FIG. 3 is a front view of the torque sensor load slip pack of the present invention.
Fig. 4 is a schematic structural view of the transition bushing of the present invention.
Fig. 5 is a schematic view of the sleeve structure of the present invention.
Detailed Description
As shown in fig. 1 to 5, the device suitable for calibrating multiple sets of torque sensors of the present invention includes an installation base 1, a calibration device base plate 2, a torque sensor loading sliding set 3, a calibration device torque transmission assembly 4, a torque sensor 6 to be calibrated, a calibration device tail bearing assembly 5, a computer 7, and a mass block 8.
In the invention, the mounting base 1 is a trapezoidal frame and is formed by welding a plurality of channel steels and square steels, and a plurality of unthreaded holes are processed on the periphery of the upper surface; on which a calibration device base plate 2 is mounted. The base plate 2 of the calibration device is a rectangular steel plate, a mounting groove reference surface is processed in the middle of the base plate, and threaded holes are processed in the reference surface and around the steel plate; the calibration device base plate 2 is installed on the installation base 1 through screws, and a calibration device torque transmission component 4 and a calibration device tail bearing component 5 are installed on the calibration device base plate 2.
In the invention, the torque sensor loading slide group 3 comprises a torque sensor calibration plate 3.1, a cover 3.2, a motor mounting plate 3.3, a servo motor 3.4, a coupler 3.5, a bearing mounting seat 3.6, a bearing 3.7, a trapezoidal lead screw 3.8, a lead screw nut 3.9, a lead screw nut seat 3.10, a first guide rail 3.11, a first slide block 3.12, a slide seat 3.13, a magnetic grid ruler reading head 3.14, a magnetic grid ruler 3.15 and a limit switch 3.16. The torque sensor calibration plate 3.1 is a welding part and is formed by welding a rectangular steel plate, round steel and a reinforcing rib plate, the shape of the torque sensor calibration plate is in an asymmetric triangle shape, a penetrating long groove is processed on the surface of the rectangular steel plate after welding, a threaded hole is processed at the bottom of the groove, a row of threaded holes are processed on bosses on two sides of the groove respectively, a threaded hole is also processed on one end face, four threaded holes are processed on the circumference of the end face of the round steel, a double-key slot hole is processed in the center, and the torque sensor calibration plate is connected with a calibration shaft 4.2 in; the cover 3.2 is in a circular flange shape, a boss is processed in the middle, four unthreaded holes are processed on the circumference of the flange, and the cover is arranged on the end face of the round steel of the calibration plate of the torque sensor through screws; the motor mounting plate 3.3 is a rectangular steel plate, positioning holes and mounting holes are processed on the motor mounting plate, and the motor mounting plate 3.3 is mounted on the end face of the torque sensor calibration plate 3.1 through screws; the bearing mounting seats 3.6 are in an inverted T shape, stepped unthreaded holes are machined in the middle of the bearing mounting seats, countersunk holes are machined in two ends of the T shape, and the two bearing mounting seats 3.6 are respectively installed at two ends of a calibration plate 3.1 of the torque sensor through screws; the screw nut seat 3.10 is in a square shape, a through hole is processed in the middle, and threaded holes are processed on both sides and the upper surface; the sliding seat 3.13 is concave, a countersunk hole is processed at the middle part, and threaded holes are processed at the two sides; the servo motor 3.4, the coupler 3.5, the bearing 3.7, the trapezoidal lead screw 3.8, the lead screw nut 3.9, the lead screw nut seat 3.10, the first guide rail 3.11, the first slide block 3.12, the magnetic grid ruler read head 3.14, the magnetic grid ruler 3.15, the limit switch 3.16 and the like are standard components; a servo motor 3.4 is arranged on a motor mounting plate 3.3 through screws, two bearings 3.7 are respectively arranged in a bearing mounting seat 3.6, two ends of a trapezoidal lead screw 3.8 both penetrate through the bearings 3.7, one end of the trapezoidal lead screw is connected with an output shaft of the servo motor 3.4 through a coupler 3.5, a lead screw nut 3.9 is respectively connected with a lead screw 3.8 and a lead screw nut seat 3.10, two first guide rails 3.11 are respectively arranged on bosses at two sides of a torque sensor calibration plate 3.1 through screws, two first slide blocks 3.12 are respectively matched with the two first guide rails 3.11, a slide seat 3.13 is respectively arranged with the two first slide blocks 3.12 and the lead screw nut seat 3.10 through screws, and a mass block 8 is arranged on the slide seat 3.13; one side surface of the screw nut seat 3.10 is provided with a magnetic grid ruler reading head 3.14, the other side surface is provided with a limit switch component, a magnetic grid ruler 3.15 is pasted in a groove of a torque sensor calibration plate 3.1 and is positioned right below the magnetic grid ruler reading head 3.14, and a limit switch 3.16 is arranged at one end of the torque sensor calibration plate 3.1 to ensure that the magnetic grid ruler reading head can be aligned with the component.
In the invention, the calibration device torque transmission assembly 4 comprises a torque sensor calibration support 4.1, a calibration shaft 4.2, a bearing 4.3, a bearing end cover 4.4, a calibration support cover 4.5 and a transition shaft sleeve 4.6. The torque sensor calibration support 4.1 is a box body, U-shaped grooves are formed in two sides of a lower plate, the front and rear installation distances can be adjusted, two through holes are formed in the front plate and the rear plate of the box body and are concentric, a bearing 4.3 is placed in each through hole, a circle of threaded holes are formed in the outer sides of the two through holes, four threaded holes are also formed in the upper surfaces of the two through holes, and the torque sensor calibration support 4.1 is installed on a calibration device base plate 2 through screws; the calibration shaft 4.2 is a stepped shaft, one end of the stepped shaft is provided with double outer key grooves, the other end of the stepped shaft is provided with an inner spline groove, the stepped shaft passes through a bearing and is arranged in the torque sensor calibration support 4.1, one end of the stepped shaft is connected with a torque sensor calibration plate 3.1 in the torque sensor loading sliding set 3 through a key, and the other end of the stepped shaft is matched with a transition shaft sleeve 4.6 through a spline; the bearing end cover 4.4 is a circular flange, a boss and a through hole are processed in the bearing end cover 4.4, and the bearing end cover 4.4 is fixed on the front surface and the rear surface of the torque sensor calibration support 4.1 through screws; the calibration support cover 4.5 is a rectangular cover plate, four unthreaded holes are processed on the calibration support cover, and the calibration support cover is arranged on the calibration support 4.1 of the torque sensor through screws; transition axle sleeve 4.6 is ladder axle class part, and one end processing has external splines, and other end processing has two interior flat keyways, external splines one end with mark 4.2 internal splines cooperation of axle, the other end through the flat key with wait to mark torque sensor 6 and be connected, transition axle sleeve 4.6 is removable part, can choose for use not the transition axle sleeve 4.6 of equidimension according to the torque sensor of different specifications.
In the invention, the tail bearing assembly 5 of the calibration device comprises a second guide rail 5.1, a second sliding block 5.2, a flange sleeve mounting frame 5.3, a flange sleeve 5.4, a sleeve 5.5 and a locking handle 5.6. The second guide rails 5.1 and the second sliding blocks 5.2 are standard parts, the two second guide rails 5.1 are respectively fixed on two sides of one end of the calibration device bottom plate 2 through screws, and the two second sliding blocks 5.2 are respectively installed with the two second guide rails 5.1 in a matched mode; the flange sleeve mounting rack 5.3 is L-shaped, reinforcing ribs are arranged at the right angle, threaded holes are formed in the bottom plate, unthreaded holes and threaded holes uniformly distributed around the unthreaded holes are formed in the side plates, and the flange sleeve mounting rack 5.3 is mounted on the two second sliding blocks 5.2 through screws; the flange sleeve 5.4 is a stepped shaft, a circle of unthreaded holes are processed on the large circular surface, a spline groove through hole is processed inside the stepped shaft, and the flange sleeve 5.4 is installed on a flange sleeve mounting frame 5.3 through screws; the sleeve 5.5 is a shaft part, an external spline is processed on the outer part of the sleeve, a double-key-groove through hole is processed on the inner part of the sleeve, the outer part of the sleeve 5.5 is in spline fit connection with a flange sleeve 5.4, the inner part of the sleeve is connected with a torque sensor 6 to be calibrated through a flat key, the sleeve 5.5 is a replaceable part, and sleeves 5.5 with different sizes can be selected according to torque sensors with different specifications; locking handle 5.6 is the standard component, and locking handle 5.6 passes the screw hole of 2 on the flange sleeve mounting bracket bottom plate, can compress tightly calibration device bottom plate 2, prevents calibration device afterbody carrier assembly 5 back-and-forth movement.
In the invention, the mass block 8 is a cuboid iron block with accurate mass, a unthreaded hole is processed on the mass block, the mass block is arranged on the torque sensor loading sliding group 3 through a screw with determined mass when in need, and the mass block 8 has various specifications.
The technical scheme adopted by the calibration method of the device suitable for calibrating the multiple groups of torque sensors is further described as follows:
referring to fig. 1 and 3, the torque value of the carriage 3.13 in the torque sensor loading pack 3 at each position is determined.
Firstly, a calibrated small-range torque sensor is selected to be installed at a torque sensor 6 to be calibrated and installed in place, and the position of a tail bearing component 5 of the calibration device is locked through a locking handle 5.6.
Secondly, the servo motor 3.4 is started, the sliding seat 3.13 is driven to move through the lead screw 3.8, and when the sliding seat 3.13 moves to the position of the limit switch 3.16 and stops moving, the moment is marked as a zero point of the device; because the position of the limit switch 3.16 from the central line of the calibration shaft 4.2 is determined by the calibration device, the position coordinate of the zero point from the central line of the calibration shaft 4.2 is known; at the moment, the position of the magnetic grid ruler reading head 3.14 is an initial position, the position of the lead screw nut seat 3.10 is a zero position, the position of the sliding seat 3.13 is a balance position, the numerical value of the torque sensor at the moment is recorded, and the torque value is the zero value of the calibration device.
Next, the servo motor 3.4 rotates reversely, the sliding seat 3.13 moves reversely, the moving distance X of the sliding seat 3.13 is recorded through the reading head 3.14 of the magnetic grid ruler in real time, the torque T in the process is recorded through the computer 7, and a T-X curve is generated; the torque value for each specific position of the carriage 3.13 is thus obtained.
Finally, the central line of the calibration shaft 4.2 is taken as a reference, the positions of different mass blocks 8 from the central line of the calibration shaft 4.2 are different, the generated torques are different, the mass of each mass block 8 and the mass of the screw can be accurately measured when each mass block 8 is installed, and different torque values T' generated by each mass block 8 at different positions can be calculated according to the masses and the positions; therefore, the torque T at a certain position after the mass block is installedGeneral assemblyThe corresponding torque range that the device can calibrate after each mass 8 has been mounted is recorded by the computer 7 as T + T'.
And carrying out torque calibration on the torque 6 of the torque sensor to be calibrated.
Firstly, selecting a proper transition shaft sleeve 4.6, a proper sleeve 5.5 and a proper mass block 8 according to the size specification of the torque sensor 6 to be calibrated, respectively installing the transition shaft sleeve 4.6, the proper sleeve 5.5 and the proper mass block 8 to correct positions, and installing the torque sensor 6 to be calibrated.
Secondly, starting the servo motor 3.4, moving the sliding seat 3.13 to a balance position (namely, zero torque) by controlling the servo motor 3.4, and recording the position coordinate of the sliding seat 3.13 by the computer 7, wherein the position coordinate is 4.2 central lines X away from the calibration shaft0The balancing torque generated by the slide 3.13 and the mass 8
Can be calculated by a computer. Then, the torque value first calibrated by the torque sensor 6 is selected to be 20% of the torque sensor range, and the torque is simultaneously obtained by the sliding seat 3.13 and the mass block 8 at the position X1Generated by the process, and X is calculated by the computer 71Then the computer 7 controls the servo motor 3.4 to drive the sliding seat 3.13 to move towards the direction far away from the servo motor 3.4 to the coordinate X1And (6) performing first calibration.
Thirdly, the torque value calibrated for the second time by the torque sensor 6 is continuously selected, the torque value is 40 percent of the measuring range of the torque sensor, and the torque is simultaneously positioned at the position X by the sliding seat 3.13 and the mass block 82Generated by the process, and X is calculated by the computer 72Then the computer 7 controls the servo motor 3.4 to move the slide 3.13 with the mass 8 to the X position2And (6) performing second calibration. The torque values calibrated from the third to the fifth times of the torque sensor 6 are sequentially selected to be 60 percent, 80 percent and 100 percent of the measuring range, and the corresponding coordinate X is respectively calculated by the computer 73、X4、X5Then the computer 7 controls the servo motor 3.4 to make the sliding seat 3.13 with the mass block 8 move to X respectively3、X4、X5And performing third to fifth calibration. After the calibration of five torque values of the torque sensor 6 is completed in sequence, the sliding seat 3.13 returns to the balance position again for the next calibration.
After the calibration of one torque sensor is finished, the sensor, and a transition shaft sleeve 4.6, a sleeve 5.5 and a mass block 8 which are correspondingly arranged with the sensor are dismounted; and (3) replacing a torque sensor 6 to be calibrated with different specifications, and a transition shaft sleeve 4.6, a sleeve 5.5 and a mass block 8 which are correspondingly arranged, repeating the first step to the third step, and continuing to calibrate until the calibration of all the torque sensors with the required specifications is completed.
Claims (3)
1. The utility model provides a device suitable for calibration of multiunit torque sensor which characterized in that: the device comprises an installation base, a torque sensor loading sliding group, a calibration device torque transmission assembly, a to-be-calibrated torque sensor, a calibration device tail bearing assembly, a computer and a mass block, wherein one end of the to-be-calibrated torque sensor is clamped on the calibration device tail bearing assembly, the other end of the to-be-calibrated torque sensor is connected with the calibration device torque transmission assembly, the calibration device torque transmission assembly is connected with the torque sensor loading sliding group, and the mass block is positioned on the torque sensor loading sliding group; the loading sliding set of the torque sensor comprises a torque sensor calibration plate, a servo motor, a lead screw nut and a first guide rail, wherein the servo motor is arranged on the torque sensor calibration plate, the servo motor is connected with the lead screw, the lead screw is sleeved with the lead screw nut, the lead screw nut is connected with a lead screw nut seat, the lead screw nut seat is connected with two first slide blocks, the first slide blocks are connected with a slide seat, a mass block is positioned on the slide seat, the two first slide blocks are respectively positioned on the first guide rail, the first guide rail is arranged on the torque sensor calibration plate, a magnetic grid ruler reading head is arranged on one side surface of the lead screw nut seat, a magnetic grid ruler matched with the magnetic grid ruler reading head for use is arranged on the torque sensor calibration plate, and the magnetic grid ruler reading head and the torque sensor to be calibrated are; the servo motor drives the screw rod to rotate, so that the screw rod nut seat is driven to move on the first guide rail, and the torque is acted on the torque sensor to be calibrated through the torque transmission assembly of the calibration device; the calibration device comprises a torque transmission assembly, a calibration device and a control device, wherein the torque transmission assembly comprises a torque sensor calibration support, a calibration shaft and a transition shaft sleeve, one end of the transition shaft sleeve is connected with a torque sensor to be calibrated, the other end of the transition shaft sleeve is connected with the calibration shaft, the calibration shaft is arranged on the torque sensor calibration support through a bearing, and the calibration shaft is connected with a torque sensor calibration plate through a key; the tail bearing assembly of the calibration device comprises a second guide rail, a second sliding block, a flange sleeve mounting frame, a flange sleeve, a sleeve and a locking handle, wherein the second sliding block is mounted on the second guide rail; the flange sleeve is a step shaft and is arranged on the flange sleeve mounting frame through screws; the sleeve is an axle type part, and outside processing has external splines, and inside processing becomes double key groove through-hole, and the sleeve outside is connected with flange sleeve's spline fit, and inside is connected with waiting to mark torque sensor through the parallel key, and the locking handle passes through the screw thread and installs on flange sleeve mounting bracket.
2. The apparatus for calibration of multiple sets of torque sensors according to claim 1, wherein: and the torque sensor calibration plate is provided with a limit switch.
3. A method for calibrating a device suitable for calibrating a plurality of torque sensors according to claim 2, comprising the steps of:
1) after all parts are installed, a calibrated small-range torque sensor is selected to be installed at a torque sensor to be calibrated and installed in place, and the position of a tail bearing assembly of the calibration device is locked through a locking handle;
2) starting a servo motor, driving a sliding seat to move through a lead screw, stopping the movement when the sliding seat moves to a limit switch, recording the value of a torque sensor at the moment when the moment is recorded as a zero point of the device, the position of a reading head of a magnetic grating ruler is an initial position, the position of a nut seat of the lead screw is a zero point position, and the position of the sliding seat is a balance position, wherein the torque value is the zero point value of the calibration device;
3) the servo motor rotates reversely, the screw rod nut seat moves reversely from a zero position, the moving distance X of the sliding seat is recorded in real time through a reading head of the magnetic grid ruler, the torque T in the process is recorded through a computer, and a T-X curve is generated; so as to obtain the torque value when the sliding seat moves to each specific coordinate;
4) the central line of the calibration shaft is taken as a reference, the positions of different mass blocks from the central line of the calibration shaft are different, so that the generated torques are different, the masses of the mass blocks and the screw can be accurately measured when each mass block is installed, and different torque values T' generated by each mass block at different positions can be calculated through the masses and the positions; torque T at a certain position after mounting mass blockGeneral assemblyRecording a corresponding torque range which can be calibrated by the device after each mass block is installed by a computer;
5) selecting a proper transition shaft sleeve, a proper sleeve and a proper mass block according to the size specification of the torque sensor to be calibrated, respectively installing the transition shaft sleeve, the proper sleeve and the proper mass block to correct positions, and installing the torque sensor to be calibrated;
6) starting the servo motor, controlling the servo motor to move the sliding seat to the balance position, recording the position coordinates of the sliding seat by the computer, and recording the position coordinatesThe distance from the central line of the calibration shaft is X0The slide seat and the mass block generate balance torque, and then the torque T calibrated by the torque sensor for the first time is selected1The torque being simultaneously at position X by the slide and the mass1Generated by, i.e. calculating X by computer1Then the computer controls the servo motor to drive the lead screw nut seat to move to a coordinate X1X in a direction away from the servo motor1Performing first calibration;
7) continuously selecting the torque T calibrated for the second time by the torque sensor2The torque being simultaneously at position X by the slide and the mass2Generated by the process, calculating X by computer2Then the computer controls the servo motor to make the sliding seat move to X with the mass block2Performing second calibration; continuously selecting the third to fifth calibrated torques T of the torque sensor in sequence3、T4、T5Respectively calculating corresponding coordinates X by a computer3、X4、X5Then the computer controls the servo motor to make the sliding seat respectively move to X with the mass block3、X4、X5And performing third to fifth calibration, and after the five torque values of the torque sensor are calibrated in sequence, returning the screw nut seat to the balance position again for the next calibration.
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|---|---|---|---|---|
| CN108731876B (en) * | 2018-06-27 | 2024-03-26 | 厦门通测电子有限公司 | Automatic calibration instrument for torque wrench |
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