CN113295328A - Torque wrench calibrating instrument and calibrating method thereof - Google Patents
Torque wrench calibrating instrument and calibrating method thereof Download PDFInfo
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- CN113295328A CN113295328A CN202110739362.2A CN202110739362A CN113295328A CN 113295328 A CN113295328 A CN 113295328A CN 202110739362 A CN202110739362 A CN 202110739362A CN 113295328 A CN113295328 A CN 113295328A
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- G—PHYSICS
- 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
- G01L25/003—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency for measuring torque
Abstract
The invention discloses a torque wrench calibrating instrument and a calibrating method thereof, wherein the calibrating instrument comprises a control assembly, a data acquisition assembly, a driving assembly, a speed reducing assembly, a display assembly and an output shaft sleeve connector; the data acquisition assembly, the driving assembly and the display assembly are all connected with the control assembly, the driving assembly, the speed reduction assembly and the output shaft sleeve connector are sequentially connected, one end of the output shaft sleeve connector is connected with a torque wrench with verification, and the other end of the output shaft sleeve connector is connected with the data acquisition assembly. When the torque wrench is used, the control assembly receives an external instruction and transmits the external instruction to the driving assembly, the driving assembly drives the speed reducing assembly to work according to the external instruction, the final torque of the torque wrench with verification is output to the output shaft sleeve connector, the final torque is transmitted to the control assembly through the data acquisition assembly and displayed through the display assembly, the traditional manual verification is replaced by an automatic mode, and the working efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of torque wrenches, and particularly relates to a torque wrench calibrating instrument and a calibrating method thereof.
Background
The torque wrench is an important measuring instrument for product quality control in the assembly industry, is also an important foundation stone for guaranteeing the torque process quality of the threaded bolt, and has wide application in the aspects of petrochemical industry, aerospace, ships, automobiles, precision machinery, precision instrument manufacturing and the like.
Aiming at the increasingly prominent loss of enterprises caused by the problems of torque failure and the like in the present year, the torque wrench with a pointer or a digital display is mostly adopted in the engineering assembly industry, so that the problems of torque management and control failure and the like are relieved to a certain extent.
However, the accuracy of the torque wrench used in a large amount can be influenced by multiple factors after being used for a long time, in order to guarantee the torque accuracy, the verification means of many enterprises are still more original, the problems of complicated operation steps, large calculation amount, high labor cost and low verification work efficiency exist, and the normal production of the enterprises and the utilization rate of equipment are seriously influenced.
Disclosure of Invention
The torque wrench calibrator provided by the invention solves the problem of low efficiency caused by traditional manual detection.
The invention also aims to provide a verification method of the torque wrench calibrator.
The technical scheme adopted by the invention is as follows:
a torque wrench calibrator comprises a control assembly, a data acquisition assembly, a driving assembly, a speed reduction assembly, a display assembly and an output shaft sleeve connector; the data acquisition assembly, the driving assembly and the display assembly are all connected with the control assembly, the driving assembly, the speed reduction assembly and the output shaft sleeve connector are sequentially connected, one end of the output shaft sleeve connector is connected with a torque wrench with verification, and the other end of the output shaft sleeve connector is connected with the data acquisition assembly;
the control assembly receives an external instruction and transmits the external instruction to the driving assembly, the driving assembly drives the speed reduction assembly to work according to the external instruction, the final torque of the torque wrench with verification is output on the output shaft sleeve connector, and the final torque is transmitted to the control assembly through the data acquisition assembly and displayed through the display assembly.
Preferably, the control component receives external instructions through a computer.
Preferably, the calibrator further comprises a camera assembly, and the camera assembly is connected with both a computer and a torque wrench with calibration.
Preferably, the data acquisition assembly comprises a torque sensor, a second encoder and a signal adjusting module, the output shaft sleeve connector, the torque sensor, the signal adjusting module and the control assembly are sequentially connected, and the output shaft sleeve connector, the second encoder and the control assembly are sequentially connected.
Preferably, the drive assembly is a servo drive.
Preferably, the speed reduction assembly comprises a servo motor and a speed reducer, wherein the input end of the servo motor is connected with the servo driver, the output end of the servo motor is connected with the input end of the speed reducer, and the output end of the speed reducer is connected with the output shaft sleeve connector.
Preferably, the speed reduction assembly further comprises a first encoder, wherein the input end of the first encoder is connected with the servo motor, and the output end of the first encoder is connected with the servo driver.
Preferably, the display component is a display panel connected with a computer for displaying the final torque.
A calibration method for a torque wrench calibrator is characterized in that the range of a torque wrench to be calibrated is divided into N times of short loading, namely N times of loading, and the range corresponds to N calibration points, and each calibration point comprises the following steps:
s1, initializing the torque wrench with verification;
s2, inputting an external connection instruction;
s3, the control component automatically sets the torque upper limit, the rotation angle upper limit, the loading rate and the detection point according to the external instruction; and converting the parameters into the parameters of the motor operation;
s4, the driving component controls the deceleration component to work according to the parameters in the S3;
and S5, the data acquisition component acquires the torque of the torque wrench with the verification in real time and displays the torque through the display component.
Preferably, the data acquisition component in S5 acquires the torque of the torque wrench with verification in real time, and displays the torque through the display component, specifically:
s51, the data acquisition component acquires the torque of a plurality of groups of torque wrenches with verification in real time;
s52, judging whether the torques of the groups are continuously increased, if so, entering S53, otherwise, alarming and returning to S1;
s53, reading the values of the torque sensor and the second encoder, and enabling the servo motor to circularly execute and record the actual rotation angle of the current actual torque value according to the set instruction through the servo driver;
s54, judging whether the value of the torque sensor reaches a set torque value, if so, entering S55, otherwise, the servo motor continues to circularly execute recording the actual rotation angle of the current actual torque value according to a set instruction until the value reaches the set torque value;
s55, acquiring and recording the current actual torque value, the actual corner video snapshot record and the actual torque of the wrench, and forming a correlation record;
s56, executing the loading strategy and recording the detection point;
s57, judging whether all the to-be-detected fixed points in the measuring range are detected, if not, returning to S53, otherwise, entering S58;
and S58, analyzing data, generating a report, recording a typical verification curve according to a verification strategy, analyzing a wrench model according to the curve, and completing autonomous learning according to a corresponding strategy.
Compared with the prior art, when the torque wrench is used, the control assembly receives an external instruction and transmits the external instruction to the driving assembly, the driving assembly drives the speed reducing assembly to work according to the external instruction, the final torque of the torque wrench with verification is output to the output shaft sleeve connector, the final torque is transmitted to the control assembly through the data acquisition assembly and displayed through the display assembly, the traditional manual verification is replaced by an automatic mode, and the working efficiency is improved.
The calibrating instrument can adapt to torque wrenches with different measuring ranges and different types, and effectively establishes the relationship between the calibrating value and the actual value of the pointer type torque wrench and the digital type torque wrench, thereby providing important basis for improving the detection precision and the detection method; the automatic calibration and other functions of the torque wrench are realized, the automatic calibration and other functions are simple and convenient to operate, the automatic calibration and other functions are humanized, the full-range series torque wrench can be adapted through different conversion heads, the verification efficiency is greatly improved, the labor cost can be effectively reduced, and the intelligent loading and other functions which are not possessed by similar products are realized. Practice verifies that the requirement for accurate verification in batches can be met, the verification instrument conforms to GB/JJG 797 plus 2013, the verification efficiency can be effectively improved, the labor cost is reduced, certain technical advancement and high market promotion value are achieved, the device is already served for enterprises such as aerospace, and the like, and the consistent good comment of the enterprises is obtained.
Drawings
Fig. 1 is a system block diagram of a torque wrench calibrator provided in embodiment 1 of the present invention;
fig. 2 is a circuit diagram of a pulse signal generator and a programmable gain circuit in a torque wrench calibrator provided in embodiment 1 of the present invention;
fig. 3 is a circuit diagram of a 90-degree phase shift circuit in the torque wrench calibrator provided in embodiment 1 of the present invention;
fig. 4 is a circuit diagram of a phase switching circuit in a torque wrench calibrator provided in embodiment 1 of the present invention;
fig. 5 is a diagram of a three-level phase-locked loop and a frequency doubling circuit in a torque wrench calibrator according to embodiment 1 of the present invention;
fig. 6 is a quadrature pulse single-ended-to-differential circuit in the torque wrench calibrator provided in embodiment 1 of the present invention;
fig. 7 shows a signal conditioning filter circuit and a high-precision ADC acquisition circuit in a torque wrench calibrator provided in embodiment 1 of the present invention;
FIGS. 8a-8d are schematic structural views of a torque wrench calibrator
Fig. 9 is a flowchart of a method for calibrating a torque wrench calibrator according to embodiment 2 of the present invention;
fig. 10a-10d are graphs of measured single set point for torque wrenches.
The system comprises a control assembly 1, a data acquisition assembly 2, a driving assembly 3, a speed reduction assembly 4, a display assembly 5, an output shaft sleeve connector 6, a torque wrench 7, a camera assembly 8, a software panel 9, a computer 11, a torque sensor 21, a second encoder 22, a signal adjusting module 23, a servo motor 41, a speed reducer 42 and a first encoder 43.
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.
In the description of the present invention, it is to be understood that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not mean that the device or member to which the present invention is directed must have a specific orientation or position, and thus, cannot be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
Example 1
thus, by adopting the structure, the control assembly 1 receives an external instruction and transmits the external instruction to the driving assembly 3, the driving assembly 3 drives the speed reducing assembly 4 to work according to the external instruction, the final torque of the torque wrench 7 with verification is output on the output shaft sleeve connector 6, and the final torque is transmitted to the control assembly 1 through the data acquisition assembly 2 and displayed through the display assembly 5.
In a specific embodiment:
the control component 1 receives external instructions through a computer 11.
The verification instrument further comprises a camera component 8, and the camera component 8 is connected with a computer 11 and a torque wrench 7 with verification.
The data acquisition assembly 2 comprises a torque sensor 21, a second encoder 22 and a signal adjusting module 23, the output shaft sleeve connector 6, the torque sensor 21, the signal adjusting module 23 and the control assembly 1 are sequentially connected, and the output shaft sleeve connector 6, the second encoder 22 and the control assembly 1 are sequentially connected.
The driving component 3 is a servo driver.
The speed reducing assembly 4 comprises a servo motor 41 and a speed reducer 42, wherein the input end of the servo motor 41 is connected with a servo driver, the output end of the servo motor is connected with the input end of the speed reducer 42, and the output end of the speed reducer 42 is connected with the output shaft sleeve connector 6.
The speed reducing assembly 4 further comprises a first encoder 43, wherein the input end of the first encoder 43 is connected with the servo motor 41, and the output end of the first encoder 43 is connected with the servo driver.
The display component 5 is a display panel connected with a computer for displaying the final torque.
Specifically, the method comprises the following steps:
the calibrating instrument further comprises an operation panel, an indicating lamp with a button, a special cable, a hand wheel electronic orthogonal pulse generator and a motor permission knob switch, wherein the operation panel is connected with the control assembly 1 and used for state display and function operation.
The control component 1 is a controller, and is responsible for collecting torque and collecting the rotation angle of the output shaft, providing instructions for the servo driver, receiving panel instructions and driving the indicator lamp to display state feedback information.
And the servo driver receives refrigeration of the controller, controls the pulse signal method to drive the servo motor to operate, and controls the direction and the speed at the same time.
The first encoder 43: for feeding back the output shaft of the servomotor 41.
Speed reducer 42: the torque and speed conversion is realized, the precision speed reducer is adopted to enable the measurement to be more accurate, the idle return is small, and the control precision is high.
The torque sensor 21: the device is suitable for detecting and calibrating the full-range sensor and the wrenches with different ranges;
the computer 11: and the general operating system platform provides a control strategy, processes video and obtains an accurate torque wrench reading value by processing image digital signals. Rich information is provided for the software panel.
The signal conditioning module 23: and the signals of the torque sensor 21 are processed by amplification, filtering and the like to obtain real-time accurate torque digital signals.
The camera assembly 8 comprises an industrial camera, and can accurately and timely capture by using the high-pixel and high-response characteristics of the industrial camera.
The second encoder 22 and the second encoder 22 are digital incremental encoders, and the functions of the digital incremental encoders are mainly to monitor the rotation angle, the angular velocity, the angular acceleration and the like of the output shaft, communicate through the RS422 bus controller, and facilitate loading according to different strategies, so that reference basis is provided, and the verification efficiency is improved.
Output shaft sleeve connector 6, torque wrench is various on the market, and this system has designed the sleeve converter in order to can compatible physical connection in order to adapt to different kinds of torque wrench.
The torque wrench 7 to be calibrated is generally classified into two types, a pure mechanical type and a digital mechanical combination type. Namely, the torque wrenches to be tested are classified into three types: the first is that the click wrench, also called constant torque wrench, hears a click when reaching the unloading point, i.e. the ratchet unloading phenomenon provides a constant set torque; the second is of a pointer type, and during operation, the pointer index is manually read to judge whether the set torque is reached; the third is digital display type, the torque sensor provides controller to judge whether the set torque is reached, and at the same time, it gives alarm prompt for sound and light state.
Additionally, in particular embodiments:
the servo driver needs to execute orthogonal pulse instructions which must be received, the circuit shown in fig. 3 is composed of a crystal oscillator circuit and a frequency division chip, the rear stage is connected with a three-eight selector to complete program control frequency division, and the specific principle is as follows: a clock source is generated, then a phase shift phase is generated through a D trigger, the phase difference of two square waves is 90 degrees after the phase difference is generated, and the orthogonal pulse can drive a servo motor through single-end to differential conversion; the computer 11 issues to the controller, and the controller translates the instruction into the channel instruction of the 38-decoder, i.e. performs program-controlled frequency division selection.
The circuit shown in fig. 4 combines a pulse signal into two orthogonal pulse signals with 90-degree phase difference.
As shown in fig. 5-7, in this embodiment, the phase-locked loop pulse frequency multiplication is implemented in a hardware cascade mode, a signal enters from abzincclk, and after program-controlled frequency multiplication, ABZOUTCLK is output. Wherein S1-3 is 8421 coding switch, and the corresponding signals are all pulled up, and can be set as program control gain or fixed gain frequency multiplication;
the torque sensor is a bridge circuit, the conditioning circuit adopts a high-precision 24-bit ADC built-in PCA program control gain amplifier, wherein E + E-is a sensor excitation power supply, and S + S-is a torque sensor signal positive and signal negative difference input end and is connected with the core control through a standard SPI bus. The capacitors are decoupling capacitors, Y3 is a crystal oscillator, RP1 is a dial address switch, and VREF is an ADC reference voltage.
The structure of the verification instrument provided by the present embodiment is shown in fig. 8a to 8d, and specifically, the verification instrument includes a lower machine body case 10, an upper machine body case 20, a movable camera connecting rod 30, a camera 40, and an auxiliary camera illuminating lamp 50;
the upper machine body case 20 is arranged on the lower machine body case 10, the camera movable connecting rod 30 is arranged on the upper machine body case 20, and the camera 40 and the camera auxiliary illuminating lamp 50 are fixed on the camera movable connecting rod 30;
more specifically, the certification instrument further includes an operation display panel 60 and a button assembly 70 including a stop button, a reset button, and an emergency stop indicator light;
more specifically, the certification instrument further includes an indicator lamp assembly 80 including an alarm indicator lamp, an operation indicator lamp, and a power indicator lamp;
more specifically, the computer 11 is provided on the operation display panel 60;
further includes a micro printer 90 provided on the operation display panel 60;
further comprising: the device comprises a core control card and parameter display panel 160, a sensor module 170, a wrench reaction arm support column 180, a main power switch 190, a reducer box 200 of a machine body lower case, an output shaft and output shaft sleeve 210, a reducer 220, a torque output shaft connecting seat 230, an emergency stop button 240, a motor authority knob 250, an electronic pulse hand wheel 260, a moving linear guide rail 270, a cable chute 280, a torque wrench to be detected 290, a servo motor and a wrench reaction arm support sliding table 310.
The working modes of the embodiment are as follows:
the pure manual mode, compatible traditional manipulator rocking type examination appearance, practical electron hand wheel adds the frequency doubling circuit drive, translates into servo driver through the controller and corresponds pulse and direction instruction and then drive servo motor drive deceleration, adopts the electronic gear notion to realize moment of torsion loading uninstallation promptly, changes moment of torsion and rotational speed through the reduction gear, detects and data acquisition shows examination torque value and output shaft angle value in real time through the sensing, can supply the examination person to explore the research torque wrench mechanical properties and the research of precision.
An automatic mode, an automatic verification mode with higher automation degree. The mode can be self-adaptive to a mechanical click prefabricated torque wrench, and is also applicable to digital display and pointer type torque wrenches. Firstly, inputting information according to parameters of a wrench, wherein key parameters comprise range, accuracy, service life and the like, automatically dividing a check point according to a torque wrench check rule according to the range, namely generating an automatic loading strategy, automatically executing torque loading according to the loading strategy to carry out reciprocating circulating type calibration on the torque wrench, and finally automatically generating a calibration report.
The embodiment of the invention adopts the high-sensitivity torque sensor and the high-precision data acquisition technology, and can accurately and efficiently realize full-range detection of the torque wrench under the automatic switching torque sensor range;
the gated cyclic neuron network is used as a verification strategy for self-learning detection, so that stepless loading torque adjustment of the full-range servo motor is realized;
and the robot vision, image object classification, detection and other algorithms are adopted to realize the automatic snapshot torque wrench indication value by vision and realize the full closed-loop torque verification.
Example 2
The embodiment 2 of the present invention provides a method for calibrating a torque wrench calibrator, which divides the range of a torque wrench 7 with calibration into N short ranges, i.e., N times of loading, and corresponds to N calibration points, wherein the calibration of each calibration point comprises the following steps:
s1, initializing the torque wrench 7 with verification;
s2, inputting an external connection instruction;
s3, the control component 1 automatically sets the torque upper limit, the rotation angle upper limit, the loading rate and the detection point according to the external instruction; and converting the parameters into the parameters of the motor operation;
s4, the driving assembly 3 controls the deceleration assembly 4 to work according to the parameters in the S3;
s5, the data collection assembly 2 collects the torque of the torque wrench 7 with verification in real time and displays it through the display assembly 5.
The data acquisition component 2 in the step S5 acquires the torque of the torque wrench 7 with verification in real time, and displays the torque through the display component 5, specifically:
s51, the data acquisition component 2 acquires the torque of a plurality of groups of torque wrenches 7 with verification in real time;
s52, judging whether the torques of the groups are continuously increased, if so, entering S53, otherwise, alarming and returning to S1;
s53, reading the values of the torque sensor 21 and the second encoder 22, and enabling the servo motor 41 to circularly record the actual rotation angle of the current actual torque value according to a set instruction through the servo driver;
s54, judging whether the value of the torque sensor 21 reaches the torque value set by the current verification point, if so, entering S55, otherwise, the servo motor 41 continues to circularly record the actual rotation angle of the current actual torque value according to the set instruction until the value reaches the set torque value;
s55, acquiring and recording the current actual torque value, the actual corner video snapshot record and the actual torque of the wrench, and forming a correlation record;
s56, executing the loading strategy and recording the detection point;
s57, judging whether all the to-be-detected fixed points in the measuring range are detected, if not, returning to S53, otherwise, entering S58;
and S58, analyzing data, generating a report, recording a typical verification curve according to a verification strategy, analyzing a wrench model according to the curve, and completing autonomous learning according to a corresponding strategy.
Specifically, as shown in fig. 9:
the first step is as follows: if the preparation work is finished, initializing the system after the spanner is correctly clamped;
the second step is that: selecting a wrench type to read the additional information of the database, wherein the step is to circularly call a subprogram;
the third step: reading whether a motor loading strategy is matched with the type of a wrench, and if the torque hand to be detected needs to be manually filled with key information such as input model, range, precision, parameters and the like for the first detection, generating a motor loading strategy;
the fourth step: automatically setting an upper torque limit, an upper corner limit, a loading rate and a detection point according to a loading strategy;
the fifth step: the controller converts the pulse number required by the motor operation parameter instruction direction, speed and torque set value according to the loading strategy;
and a sixth step: issue command control servo driver driving motor
The seventh step: torque real-time detection
Eighth step: judging whether the torque continuously increases, if so, continuing, if not, returning, alarming to stop the torque wrench when the torque wrench is clamped abnormally, re-clamping, entering a new process and restarting detection;
the ninth step: reading a torque value of a sensor, reading an angle value of an encoder 2, calculating a corner, an angular velocity and an angular acceleration motor, continuously loading, and circularly executing and recording an actual corner of a current actual torque value according to a set instruction;
the tenth step: judging whether the value of the torque sensor reaches the set torque of the nth point, and if not, continuing to execute the motor loading of the ninth step; until reaching the set torque value;
the eleventh step: acquiring and recording a current actual torque value and an actual turning angle video, snapshotting and recording actual indicating torque of the wrench, and forming a correlation record;
the twelfth step: executing a load policy and recording checkpoints
The thirteenth step: judging whether the detection of all the to-be-detected fixed points in the measuring range is finished, if not, returning to the ninth step for continuous execution; if yes, continuing;
the fourteenth step is that: analyzing data, generating a report, recording a typical verification curve according to a verification strategy, analyzing a wrench model according to the curve, and completing autonomous learning according to a corresponding strategy;
the fifteenth step: and (6) ending.
SUB 1: the cyclic calling module has the function of establishing a completed wrench data model and database paradigm relation;
SUB 2: the cyclic calling module is used for circularly recording the numerical value of the torque sensor in real time, circularly reading the angular value of the encoder, calculating information such as angular velocity, angular acceleration and the like, and forming a motor cyclic operation instruction according to a loading strategy;
SUB 3: and the cyclic calling module records the numerical value of the detection point and corresponding video snapshot data and provides data support for subsequent report generation.
Fig. 10a shows an actual measurement curve of a single verification point of a mechanical prefabricated torque wrench, where M1 is the verification point, M2 is the reverse inertia torque value of ratchet torque unloading, M3 ratchet spring energy release torque value, M4, M5, M2, and M3, where t2-t1 is one of the key references for determining the repeatability and accuracy of the prefabricated torque wrench, and M1 is the unloading point of the torque wrench.
As shown in fig. 10b, which is a typical test curve of a small-scale torque wrench, wherein the solid line part is a verification curve of the torque wrench, and the dotted line part is a speed grade curve of the motor under the torque loading strategy, it can be clearly observed from the graph that 20% of the front of the verification point is uniformly loaded at a higher speed, the numerical value of the small torque acquisition result is jittered due to the problems of clearance, vibration and the like of mechanical clamping, the torque loading speed is further increased and the detection precision is improved by 20 to 80 percent, when the last 20 percent of the torque is close to the detection point, the torque loading speed is further reduced to enable the torque loading speed to accurately reach the detection point without overshoot, and when the verification point is reached, the stability of data is observed stably for a period of time, the torque is reduced under the action of torque reverse force within a period of time when the loading is stopped, the rotation speed is rapidly increased after the verification point is captured, the initial position is rapidly returned to zero, and the next period of detection is started.
As shown in fig. 10c, high speed loading is used at the low calibration point and low speed loading is used at the high torque calibration point, and the return stroke is performed to improve efficiency by initially gradually releasing torque at low speed and then unloading at high speed and returning to the zero position.
As shown in FIG. 10d, the system can automatically set the calibration points after reading the torque wrench parameter model, the default is 5 points, and the number of the calibration points can be arbitrarily set in the system if special requirements exist. It can be seen from the figure that the torque wrench is a one-way test, wherein the negative torque is defined as the reverse direction, different sections of the curve represent different working modes of the servo motor, wherein the slope corresponds to the change of the loading angular velocity, it can be seen from the figure that different loading velocities are adopted in different sections, and the loading torque is gradually and stably increased at a practical low rotating speed in the loading verification stage, so as to ensure the accurate identification of the torque point.
In practical application, the loading strategy is not limited to the contents described herein, and many other types of loading modes are available, so that high-efficiency, high-precision and high-quality verification is achieved according to the type of the wrench, and erroneous judgment, erroneous judgment and missing judgment are avoided.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The torque wrench calibrator is characterized by comprising a control assembly (1), a data acquisition assembly (2), a driving assembly (3), a speed reduction assembly (4), a display assembly (5) and an output shaft sleeve connector (6); the data acquisition assembly (2), the driving assembly (3) and the display assembly (5) are all connected with the control assembly (1), the driving assembly (3), the speed reduction assembly (4) and the output shaft sleeve connector (6) are sequentially connected, one end of the output shaft sleeve connector (6) is connected with a torque wrench (7) with verification, and the other end of the output shaft sleeve connector (6) is connected with the data acquisition assembly (2);
the control assembly (1) receives an external instruction and transmits the external instruction to the driving assembly (3), the driving assembly (3) drives the speed reducing assembly (4) to work according to the external instruction, the final torque of the torque wrench (7) with verification is output on the output shaft sleeve connector (6), and the final torque is transmitted to the control assembly (1) through the data acquisition assembly (2) and displayed through the display assembly (5).
2. The torque wrench calibrator according to claim 1, wherein the control unit (1) receives external commands via the computer (11).
3. The torque wrench calibrator according to claim 2, further comprising a camera assembly (8), wherein the camera assembly (8) is connected to both the computer (11) and the calibrated torque wrench (7).
4. The torque wrench calibrator according to any one of claims 1 to 3, wherein the data acquisition assembly (2) comprises a torque sensor (21), a second encoder (22) and a signal conditioning module (23), the output shaft sleeve connector (6), the torque sensor (21), the signal conditioning module (23) and the control assembly (1) are sequentially connected, and the output shaft sleeve connector (6), the second encoder (22) and the control assembly (1) are sequentially connected.
5. A torque wrench calibrator according to claim 4, wherein said drive unit (3) is a servo drive.
6. The torque wrench calibrator according to claim 5, wherein the reduction assembly (4) comprises a servo motor (41) and a reducer (42), wherein an input end of the servo motor (41) is connected with the servo driver, an output end of the servo motor is connected with an input end of the reducer (42), and an output end of the reducer (42) is connected with the output sleeve connector (6).
7. The torque wrench calibrator according to claim 6, wherein the reduction assembly (4) further comprises a first encoder (43), wherein an input end of the first encoder (43) is connected with the servo motor (41), and an output end of the first encoder is connected with the servo driver.
8. A torque wrench calibrator as claimed in any one of claims 2 to 3, wherein said display unit (5) is a display panel connected to a computer for displaying said final torque.
9. The verification method of the torque wrench calibrator is characterized in that the range of a torque wrench (7) with calibration is divided into N times of loading, wherein the N times of loading correspond to N calibration points, and the calibration of each calibration point comprises the following steps:
s1, initializing the torque wrench (7) with verification;
s2, inputting an external connection instruction;
s3, the control component (1) automatically sets the torque upper limit, the rotation angle upper limit, the loading rate and the detection point according to the external instruction; and converting the parameters into the parameters of the motor operation;
s4, the driving assembly (3) controls the deceleration assembly (4) to work according to the parameters in the S3;
and S5, the data acquisition component (2) acquires the torque of the torque wrench (7) with the verification in real time and displays the torque through the display component (5).
10. The verification method of the torque wrench verification instrument according to claim 9, wherein the data acquisition component (2) in S5 acquires the torque of the torque wrench (7) with verification in real time and displays the torque through the display component (5), specifically:
s51, the data acquisition component (2) acquires the torque of a plurality of groups of torque wrenches (7) with verification in real time;
s52, judging whether the torques of the groups are continuously increased, if so, entering S53, otherwise, alarming and returning to S1;
s53, reading the values of the torque sensor (21) and the second encoder (22), and enabling the servo driver to circularly execute and record the actual rotation angle of the current actual torque value by the servo motor (41) according to a set instruction;
s54, judging whether the value of the torque sensor (21) reaches the torque value set by the current verification point, if so, entering S55, otherwise, the servo motor (41) continues to record the actual rotation angle of the current actual torque value according to the set command cycle until the set torque value is reached;
s55, acquiring and recording the current actual torque value, the actual corner video snapshot record and the actual torque of the wrench, and forming a correlation record;
s56, executing the loading strategy and recording the detection point;
s57, judging whether all the to-be-detected fixed points in the measuring range are detected, if not, returning to S53, otherwise, entering S58;
and S58, analyzing data, generating a report, recording a typical verification curve according to a verification strategy, analyzing a wrench model according to the curve, and completing autonomous learning according to a corresponding strategy.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279609A (en) * | 2021-12-09 | 2022-04-05 | 中航飞机起落架有限责任公司 | Driver torque testing system and method |
| CN114296402A (en) * | 2021-12-30 | 2022-04-08 | 江西衡源智能装备股份有限公司 | Machine tool torque zero returning method |
| WO2024045124A1 (en) * | 2022-09-01 | 2024-03-07 | Apex Brands, Inc. | A torque tester for calibrating an electronic torque wrench with operator guidance |
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2021
- 2021-06-30 CN CN202110739362.2A patent/CN113295328A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279609A (en) * | 2021-12-09 | 2022-04-05 | 中航飞机起落架有限责任公司 | Driver torque testing system and method |
| CN114296402A (en) * | 2021-12-30 | 2022-04-08 | 江西衡源智能装备股份有限公司 | Machine tool torque zero returning method |
| CN114296402B (en) * | 2021-12-30 | 2024-01-05 | 江西衡源智能装备股份有限公司 | Machine tool torque zeroing method |
| WO2024045124A1 (en) * | 2022-09-01 | 2024-03-07 | Apex Brands, Inc. | A torque tester for calibrating an electronic torque wrench with operator guidance |
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