Full-automatic calibration device for angle torque wrench
The design of the fully automated calibration device solves the problem that the angle torque wrench calibration in the existing technology is easily affected by human intervention, and realizes high-precision and efficient automated calibration, thereby improving the accuracy and consistency of the verification results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU GRG METROLOGY & TEST CO LTD
- Filing Date
- 2025-08-14
- Publication Date
- 2026-07-14
AI Technical Summary
The existing calibration methods for angle torque wrenches are easily affected by the subjective factors of operators, resulting in large measurement errors and low automation, making it difficult to guarantee the accuracy and consistency of the verification results.
The fully automated calibration device, including angle and torque sensors, drive mechanism, cantilever components, vision measurement unit, and control and data processing module, is adopted to achieve automated calibration of angle and torque, reducing manual intervention.
It achieves fully automatic calibration of angle torque wrenches, improves measurement accuracy and consistency, reduces manpower and time costs, and has intelligent data analysis capabilities.
Smart Images
Figure CN224499783U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of angle torque wrench calibration technology, specifically to a fully automatic calibration device for an angle torque wrench. Background Technology
[0002] Angle torque wrenches, as high-precision fastening tools, are widely used in many fields such as rail transportation, machinery manufacturing, automobile assembly, and aerospace. Their structure mainly consists of a wrench body (lever arm), a torque measurement unit, an angle measurement unit, and a data processing and display module. The wrench body provides the operating grip and force transmission structure; the torque measurement unit typically uses strain gauge sensors or piezoelectric sensors, which detect the strain or charge change generated when the wrench is subjected to force, converting mechanical force into an electrical signal to measure the torque value; the angle measurement unit generally uses a gyroscope sensor, recording the rotation angle of rotating parts to measure the rotation angle during the fastening process; the data processing and display module can display the measured torque and angle values in real time, and store, analyze, and process the data.
[0003] The working principle of an angle torque wrench is based on mechanics and sensor technology. During use, the operator applies torque through the wrench body. The torque measurement unit converts the force change into an electrical signal, which, after amplification and filtering, is calculated by the data processing module to obtain the torque value. Simultaneously, the angle measurement unit converts the rotation information of rotating parts into an electrical signal, which, after processing, yields the angle value. Through dual control of torque and angle, the angle torque wrench ensures that bolts, nuts, and other connecting parts are precisely tightened to the set torque and angle values, avoiding equipment failures or safety hazards caused by overtightening or loosening, effectively guaranteeing assembly quality and reliability. With its precise torque and angle control capabilities, the angle torque wrench is widely used in bolt tightening, engine assembly, bridge construction, medical device manufacturing, and other scenarios, playing a crucial role in improving product quality and ensuring equipment operational safety.
[0004] In the metrological calibration of angle torque wrenches, the current method mainly relies on the JJG 707-2014 Torque Wrench Verification Procedure, using a torque wrench calibrator to calibrate the torque. This method cannot achieve traceability of angle values. Moreover, traditional calibration methods rely on manual operation, which is easily affected by the subjective factors of the operator during torque application, data reading and recording, resulting in large measurement errors and making it difficult to guarantee the accuracy and consistency of the verification results. At the same time, the existing verification equipment has a low degree of automation, requiring a large investment of manpower and time, and lacks intelligent analysis and management functions for verification data, which is not conducive to the standardization and efficiency of verification work. Utility Model Content
[0005] The purpose of this utility model is to address the technical problems existing in the prior art by providing a fully automatic calibration device for angle torque wrenches, thereby solving the problem that existing calibration methods are easily affected by the subjective factors of operators, resulting in large measurement errors.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A fully automatic calibration device for an angle torque wrench, comprising:
[0008] The main body of the load-bearing structure;
[0009] Angle and torque sensor, which is mounted on the load-bearing body;
[0010] The drive mechanism is mounted on the load-bearing body and is spaced apart from the angle and torque sensor. The drive mechanism is used to drive the cantilever mechanism to rotate around the angle and torque sensor.
[0011] The cantilever component has one end connected to the angle and torque sensor and the other end connected to the movable end of the drive mechanism.
[0012] Lever arm stop, which is slidably connected to the cantilever component, is used to fix the lever arm of the angle torque wrench;
[0013] A vision measurement unit is mounted on the cantilever component. The vision measurement unit is used to read the angle and torque values of the angle torque wrench.
[0014] The control and data processing module connects the angle and torque sensor and the drive mechanism.
[0015] As a preferred option, the bottom of the supporting body is provided with adjustable support feet.
[0016] As a preferred embodiment, the drive mechanism includes a servo motor and a lead screw. The servo motor is mounted on the top of the support body, and a drive gear is sleeved on the output shaft of the servo motor. A driven gear is sleeved on the lead screw, and the drive gear and driven gear mesh. The lead screw is mounted on the top of the support body via a mounting base, which is fixed to the top of the support body and located on one side of the servo motor. The mounting base has a movable groove, and the lead screw and the mounting base are rotatably connected. The lead screw is located in the movable groove, and a slider is threaded onto the lead screw. The slider slides relative to the movable groove, and the cantilever component is connected and engaged with the slider. The servo motor is connected to the control and data processing module.
[0017] As a preferred embodiment, the bottom of the cantilever component is provided with a mating plate, and the bottom of the mating plate is provided with a sliding groove. The extension direction of the sliding groove is consistent with the extension direction of the cantilever component. The slider part is inserted into the sliding groove, and the slider can slide within the sliding groove.
[0018] As a preferred embodiment, the cantilever component has grooves on both sides, and the lever arm stop includes a slide plate and two stop bars. The slide plate has inserts on both sides, and the two inserts are inserted into the two grooves respectively. The two inserts are slidably connected to the two grooves respectively. The two stop bars are fixed on the top of the slide plate, and a lever arm fixing area is formed between the two stop bars. The lever arm fixing area is used to fix the lever arm of the angle torque wrench. The slide plate is locked to the cantilever component by bolts.
[0019] As a preferred embodiment, the vision measurement unit includes a bracket and a vision measurement module. The top of the cantilever component is provided with a connecting groove, and the bracket is slidably connected to the connecting groove. The bracket is locked to the cantilever component by bolts. The vision measurement module is mounted on the bracket and is connected to the control and data processing module.
[0020] As a preferred embodiment, the top of the slide plate is provided with an adjustment groove, and both stops are slidably connected to the adjustment groove. The two stops are fixed to the adjustment groove by pins or locking screws.
[0021] In summary, this utility model has the following advantages:
[0022] The fully automatic calibration device of this invention can realize the fully automatic calibration of the angle and torque of the angle torque wrench, and is also applicable to the fully automatic calibration of preset, digital display and pointer type torque wrenches. Attached Figure Description
[0023] Figure 1 This is a 3D view of the fully automated calibration device.
[0024] Figure 2 This is a stereoscopic view of the fully automated calibration device from another perspective.
[0025] Figure 3 This is a 3D view of the drive mechanism.
[0026] Figure 4 This is a three-dimensional view of the drive mechanism from another perspective.
[0027] Figure 5 This is a schematic diagram of a fully automatic calibration device calibrating an angle torque wrench.
[0028] Figure 6 The diagram shows the angle torque wrench in a horizontal test state, where point a is the loading point, which is the middle of the handle grip position of the angle torque wrench.
[0029] Figure 7 The diagram shows the angle torque wrench in a vertical test state, where point a is the loading point, which is the middle of the lifting position of the angle torque wrench handle.
[0030] Among them, 1 is the adjustable support foot, 2 is the load-bearing body, 3 is the servo motor, 31 is the drive gear, 4 is the mounting base, 41 is the lead screw, 42 is the movable groove, 43 is the mating plate, 44 is the slide groove, 45 is the driven gear, 46 is the slider, 5 is the angle and torque sensor, 6 is the cantilever component, 7 is the lever arm stop, 71 is the stop bar, 8 is the bracket, 9 is the vision measurement module, 10 is the control and data processing module, 11 is the connecting groove, 12 is the groove, and 13 is the angle and torque wrench. Detailed Implementation
[0031] The present invention will be further described in detail below with reference to specific embodiments.
[0032] like Figure 1-5 As shown, this embodiment provides a fully automatic calibration device for an angle torque wrench, comprising:
[0033] 2. Supporting body;
[0034] An angle torque sensor 5 is mounted on the support body 2; for example, the model of the angle torque sensor 5 is imc CLSx.
[0035] A drive mechanism is mounted on the load-bearing body. The drive mechanism is spaced apart from the angle torque sensor 5. The drive mechanism is used to drive the cantilever mechanism to rotate around the angle torque sensor 5.
[0036] The cantilever component 6 has one end connected to the angle and torque sensor 5 and the cantilever component 6 is connected to the movable end of the drive mechanism.
[0037] The lever arm stop 7 is slidably connected to the cantilever component 6 and is used to fix the lever arm of the angle torque wrench 13.
[0038] A vision measurement unit is mounted on the cantilever component 6. The vision measurement unit is used to read the angle and torque values of the angle torque wrench 13. For example, the model of the vision measurement unit is MV-CT120G-9GM01-PRO.
[0039] The control and data processing module 10 connects to the angle and torque sensor 5 and the drive mechanism. The main function of the control and data processing module 10 is to set the calibration program and automatically process the calibration results to generate a report. For example, an existing desktop computer capable of running a Windows system can be used for the control and data processing module.
[0040] The bottom of the supporting body 2 is provided with an adjustable support foot 1. The adjustable support foot 1 can adjust the level of the calibration device.
[0041] The drive mechanism includes a servo motor 3 and a lead screw 41. The servo motor 3 is mounted on the top of the support body 2. The output shaft of the servo motor 3 is sleeved with a drive gear, and the lead screw 41 is sleeved with a driven gear 45. The drive gear and the driven gear 45 mesh. The lead screw 41 is mounted on the top of the support body 2 via a mounting seat 4. The mounting seat 4 is fixed to the top of the support body 2 and is located on one side of the servo motor 3. The mounting seat 4 has a movable groove 42. The lead screw 41 and the mounting seat 4 are rotatably connected. The lead screw 41 is located in the movable groove 42. The lead screw 41 is threadedly connected to a slider 46. The slider 46 slides relative to the movable groove 42. The cantilever component 6 is connected and cooperates with the slider 46. The servo motor 3 is connected to the control and data processing module 10.
[0042] The bottom of the cantilever component 6 is provided with a mating plate 43, and the bottom of the mating plate 43 is provided with a sliding groove 44. The extension direction of the sliding groove 44 is consistent with the extension direction of the cantilever component 6. The slider 46 is partially inserted into the sliding groove 44, and the slider 46 can slide within the sliding groove 44. By setting a mating plate 43 and a sliding groove 44 at the bottom of the mating plate 43, the servo motor 3 drives the lead screw 41 to rotate, causing the slider 46 to slide in the movable groove 42. The part of the slider 46 inserted into the sliding groove 44 causes the mating plate 43 to slide along with the slider 46. Since the movement of the slider 46 on the lead screw is linear, and the cantilever component 6 needs to drive the angle torque wrench 13 to move clockwise or counterclockwise around the angle torque sensor 5, the sliding groove 44 is set. When the part of the slider 46 inserted into the sliding groove 44 causes the mating plate 43 to slide along with the slider 46, the slider 46 slides relative to the sliding groove 44, thereby driving the cantilever component 6 to move clockwise or counterclockwise around the fixed high-precision angle torque sensor 5. The high-precision angle torque sensor 5 can simultaneously measure and feedback the standard angle and torque values.
[0043] The cantilever component 6 has grooves 12 on both sides. The lever arm stop 7 includes a sliding plate and two stop rods 71. Inserts are located on both sides of the sliding plate, and the two inserts are inserted into the two grooves 12 respectively, slidingly connecting them. The two stop rods 71 are fixed to the top of the sliding plate, forming a lever arm fixing area between them. This area is used to fix the lever arm of the angle torque wrench 13. The sliding plate is bolted to the cantilever component 6. The position of the lever arm stop 7 can be adjusted along the groove 12 according to the position of the force line of different torsion wrenches and is bolted in place. Its main function is to fix the lever arm of the torque wrench being calibrated. Through the cantilever component 6 and the stop rods 71, the lever arm of the angle torque wrench 13 rotates clockwise or counterclockwise around the fixed high-precision angle torque sensor 5, thereby loading the standard angle and torque value.
[0044] The vision measurement unit includes a bracket 8 and a vision measurement module 9. A connecting groove 11 is provided at the top of the cantilever component 6. The bracket 8 is slidably connected to the connecting groove 11 and is locked to the cantilever component 6 by bolts. The vision measurement module 9 is mounted on the bracket 8 and is connected to the control and data processing module 10. The bracket 8 is adjusted along the direction of the connecting groove 11 according to the position of the torque wrench angle torque display. The extension direction of the connecting groove 11 is consistent with the extension direction of the cantilever component 6 and is locked by bolts. Its main function is to fix the vision measurement module 9. The main function of the vision measurement module 9 is to read the angle and torque values of the torque wrench (including digital and pointer types).
[0045] The top of the slide plate is provided with an adjustment groove, and both stop rods 71 are slidably connected to the adjustment groove. The two stop rods 71 are fixed to the adjustment groove by pins or locking screws. The two ends of the adjustment groove extend to both sides of the slider 46. By setting the adjustment groove, the distance between the two stop rods 71 can be adjusted, thereby facilitating the fixing of the lever arm of the torque wrench 13 at different angles.
[0046] like Figure 6-7 As shown, the calibration process is as follows:
[0047] (1) Preparations before calibration;
[0048] Adjust the angle torque wrench according to Figure 6-7 The requirement is to install it on the calibration device so that the loading point corresponds to point a, where point a is the annular groove that all existing angle torque wrench handles have, and to connect the angle torque wrench measuring shaft coaxially in series with the angle torque sensor 5 of the calibration device.
[0049] The control and data processing module is activated, the model and specifications of the angle torque wrench are read, and the measurement range is automatically identified according to the database and verification procedures.
[0050] (2) Checking relative resolution;
[0051] 1) The resolution r of the analog angle torque wrench is calculated by measuring the width of the pointer indication part by the vision measurement unit and the distance between two adjacent graduations on the scale or dial. It is generally 1 / 2, 1 / 4 or 1 / 5 of the graduation value.
[0052] 2) Resolution r of digital angle torque wrench: The resolution is measured and read by the visual measurement unit under zero torque conditions. When the display is stable, the resolution is a minimum increment of the displayed value. When the display is unstable, it is 1 / 2 of the fluctuation range.
[0053] The relative resolution is calculated by the control and data processing module 10 according to formula (1):
[0054]
[0055] In the formula:
[0056] r — the resolving power of the torque wrench, Nm;
[0057] M0—Lower limit of the angle torque wrench measurement, Nm.
[0058] (3) Checking the zero-return error;
[0059] The angle torque wrench is automatically preloaded three times at full scale by the calibration device. The zeroing value m0 of the torque wrench is read by the visual measurement unit before calibration and about 10 seconds after the third full-scale pre-torque unloading.
[0060] The zero-return error is calculated by the control and data processing module 10 according to formula (2):
[0061]
[0062] In the formula:
[0063] m0 — Zeroing value of the torque wrench, Nm;
[0064] M s — Upper limit of the angle torque wrench measurement, Nm.
[0065] (4) Torque indication error and repeatability calibration;
[0066] 1) The calibration device preloads the torque wrench of the angle being calibrated with the maximum torque three times.
[0067] 2) After pre-torsion, apply torque steadily and gradually to the calibration point, and record the torque value at each point. Repeat this process 3 times.
[0068] The control and data processing module 10 calculates the indication error of the indicative angle torque wrench according to formula (3) and the repeatability according to formula (4):
[0069]
[0070] In the formula:
[0071] k — the amplification factor of the multiplier; k=1 when there is no multiplier.
[0072] M—Indicated value (Nm) of the torque wrench at the calibration point;
[0073] —The arithmetic mean of three readings from the calibration device at the calibration point, Nm;
[0074] —The maximum and minimum values of the torque wrench readings at the calibration point, in Nm.
[0075] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.
Claims
1. A fully automatic calibration device for an angle torque wrench, characterized in that, include: The main body of the load-bearing structure; Angle and torque sensor, which is mounted on the load-bearing body; The drive mechanism is mounted on the load-bearing body and is spaced apart from the angle and torque sensor. The drive mechanism is used to drive the cantilever mechanism to rotate around the angle and torque sensor. The cantilever component has one end connected to the angle and torque sensor and the other end connected to the movable end of the drive mechanism. Lever arm stop, which is slidably connected to the cantilever component, is used to fix the lever arm of the angle torque wrench; A vision measurement unit is mounted on the cantilever component. The vision measurement unit is used to read the angle and torque values of the angle torque wrench. The control and data processing module connects the angle and torque sensor and the drive mechanism.
2. The fully automatic calibration device for an angle torque wrench according to claim 1, characterized in that: The bottom of the main body is equipped with adjustable support feet.
3. The fully automatic calibration device for an angle torque wrench according to claim 1, characterized in that: The drive mechanism includes a servo motor and a lead screw. The servo motor is mounted on the top of the support body. The output shaft of the servo motor is sleeved with a drive gear, and the lead screw is sleeved with a driven gear. The drive gear and the driven gear mesh. The lead screw is mounted on the top of the support body via a mounting base. The mounting base is fixed to the top of the support body and is located on one side of the servo motor. The mounting base has a movable groove. The lead screw and the mounting base are rotatably connected. The lead screw is located in the movable groove. The lead screw is threadedly connected to a slider. The slider slides relative to the movable groove. The cantilever component is connected and cooperates with the slider. The servo motor is connected to the control and data processing module.
4. The fully automatic calibration device for an angle torque wrench according to claim 3, characterized in that: The bottom of the cantilever component is provided with a mating plate, and the bottom of the mating plate is provided with a sliding groove. The extension direction of the sliding groove is consistent with the extension direction of the cantilever component. The slider part is inserted into the sliding groove, and the slider can slide within the sliding groove.
5. The fully automatic calibration device for an angle torque wrench according to claim 1, characterized in that: The cantilever component has grooves on both sides. The lever arm stop includes a slide plate and two stop bars. The slide plate has inserts on both sides. The two inserts are inserted into the two grooves respectively and are slidably connected to the two grooves respectively. The two stop bars are fixed on the top of the slide plate, and a lever arm fixing area is formed between the two stop bars. The lever arm fixing area is used to fix the lever arm of the angle torque wrench. The slide plate is locked to the cantilever component by bolts.
6. The fully automatic calibration device for an angle torque wrench according to claim 1, characterized in that: The vision measurement unit includes a bracket and a vision measurement module. The top of the cantilever component is provided with a connecting groove, and the bracket is slidably connected to the connecting groove. The bracket is locked to the cantilever component by bolts. The vision measurement module is mounted on the bracket and is connected to the control and data processing module.
7. The fully automatic calibration device for an angle torque wrench according to claim 5, characterized in that: The top of the slide plate is equipped with an adjustment groove, and both stops are slidably connected to the adjustment groove. The two stops are fixed to the adjustment groove by pins or locking screws.