Constraint type torque calibration equipment

Abstract

The invention discloses constraint type torque calibration equipment which comprises a working base, a loading device used for applying torque is arranged on one side of the working base, a calibration device used for being matched with the loading device to verify and calibrate a detected product is arranged on the other side of the working base, and the loading device and the calibration device are both connected with an electric control system. The calibration device comprises a force arm seat and an equal-arm-length lever mechanism which is arranged on the force arm seat and is coaxial with the detected product, and after the loading device applies torque, a torque signal is transmitted to the calibration device through the detected product, reflected by the lever mechanism and fed back to the electric control system for calibration. The loading device applies torque and then transmits the torque to the calibration device through a detected product, the lever mechanism reflects a torque signal and shares the torque signal into force signals at the two ends of a lever, the lever mechanism is restrained through two parallel forces which are equal in magnitude, opposite in direction and not collinear, the friction torque at the moment arm end is eliminated theoretically, and the calibration accuracy is improved. And key factors influencing the torque measurement accuracy are reduced.

Description

[Technical field] The present invention relates to the technical field of torque calibration, and in particular to a constrained torque calibration device. [Background technology] Torque standard machines are mainly used to verify or calibrate instruments such as torque sensors, hydraulic wrench verification devices, and torque plate verification instruments. They play a role in torque value transmission and traceability in equipment manufacturing, engineering construction, and other fields. According to their main structure and the way of applying torque, they can be divided into four forms, namely, deadweight torque standard machines, lever torque standard machines, reference torque standard machines, and force sensor torque standard machines.

[0003] However, static weight torque standard machines and lever torque standard machines are widely welcomed by the market for their simple principles, easy-to-implement structures, and relatively high measurement accuracy, but they are usually suitable for the transmission and traceability of small and medium torque values; reference torque standard machines have a wide measurement range, but the accuracy level of reference torque sensors is difficult to reach above level 0.1, and the value traceability is also relatively difficult, which is suitable for the value transmission and traceability of torque sensors for large torque work; force sensor torque standard machines use a combination of force sensors and levers to achieve torque measurement, which has the advantages of relatively low cost, simple torque traceability, and a wide measurement range, but this type of torque standard machine has high requirements for torque control and structure. Therefore, there is an urgent need for a torque calibration device that can optimize the loading method, improve the loading range, and measurement accuracy. [Summary of the invention] In order to solve the above technical problems, the present invention proposes a constrained torque calibration device.

[0005] The present invention is achieved by the following technical solutions: A constrained torque calibration device is used to verify and calibrate the inspected product, including a working base, a loading device for applying torque is provided on one side of the working base, and a calibration device for cooperating with the loading device to verify and calibrate the inspected product is provided on the other side of the working base. The loading device and the calibration device are both connected to an electronic control system. The calibration device includes a lever arm seat and an equal-arm-length lever mechanism coaxial with the inspected product and provided on the lever arm seat. When the loading device applies torque, the torque signal is transmitted to the calibration device via the inspected product, reflected by the lever mechanism and fed back to the electronic control system for calibration.

[0006] As described above, in the constrained torque calibration device, a first connector coaxial with the loading device is provided on the side of the loading device close to the calibration device, and a second connector corresponding to the first connector is provided on the side of the calibration device close to the loading device. The inspected product is arranged between the loading device and the calibration device via the first connector and the second connector, and the lever mechanism is coaxially driven by the second connector.

[0007] As described above, the constrained torque calibration device, the lever mechanism comprises two lever arms which are equidistant from the axis of the second connector and are located in the same straight line, and the lever mechanism is provided with a force arm loading end at one end of the lever arm away from the second connector.

[0008] As described above, the constrained torque calibration equipment, the calibration device is provided with a bracket at the position corresponding to the loading end position of the lever arm, the bracket is provided with a reaction frame fixing seat on the side away from the working base, one of the lever arms is provided with a reaction frame steel belt connected to the reaction frame fixing seat, and the other lever arm is provided with a base steel belt connected to the working base, the reaction frame steel belt and the base steel belt are both provided with force measuring pieces for measuring force, and the force measuring pieces are electrically connected to the electronic control system.

[0009] As described above, in the constrained torque calibration device, the reaction frame steel belt is arranged on the side of the force arm loading end away from the working base, the base steel belt is arranged on the side of the force arm loading end close to the working base, and the force arm loading end is an arc-shaped structure.

[0010] As described above in the constrained torque calibration device, a bearing member is provided between the second connector and the lever mechanism.

[0011] As described above in the constrained torque calibration device, the lever mechanism is provided with a weight loading mechanism for adjusting the symmetry of the lever at a position on the lever arm deviating from the loading end of the force arm.

[0012] In the constrained torque calibration device as described above, the force measuring piece adopts a standard dynamometer for measuring the two lever arm force signals.

[0013] As described above, in the constrained torque calibration device, a force arm leveling device for adjusting the balance of the lever mechanism is provided on one side of the reaction frame fixing seat.

[0014] As described above, the constrained torque calibration device has a slide rail on the working base, a slide groove corresponding to the slide rail is provided on the side of the loading device close to the working base, and a mating part that cooperates with the working base is provided on one side of the loading device, and the mating part includes a control part for controlling the loading device to be fixed or movable relative to the working base.

[0015] Compared with the prior art, the constrained torque calibration device proposed by the present invention has the following beneficial effects: 1. After the loading device applies torque, it is transmitted to the calibration device through the inspected product. The torque signal is reflected and shared into force signals at both ends of the lever through the lever mechanism, so that the lever mechanism is constrained by two parallel forces of equal magnitude and opposite direction but not collinear, theoretically eliminating the friction torque at the end of the lever arm and reducing the key factors affecting the accuracy of torque measurement; 2. The lever structure is an equal-arm lever, which can constrain the lever mechanism through two parallel forces of equal size and opposite direction but not collinear, so that it reflects the torque signal. In addition, the single-end load of the lever is reduced by half compared with the traditional torque standard machine, which not only effectively reduces the stress on the lever and related components, improves the durability and stability of the equipment, but also provides a theoretical basis for manufacturing torque standard machines with ultra-large torque values; 3. The loading end of the lever arm is an arc-shaped structure. When the torque standard machine is running, the lever is allowed to deflect at a certain angle. Without a complex dynamic horizontal adjustment system, the lever arm length can be ensured to remain stable. At the same time, the installation redundancy of the force sensor is increased, and the size change of the lever arm caused by the installation error of the standard force sensor is effectively reduced. With the rolling bearing support, the measurement sensitivity is significantly improved. While ensuring the measurement accuracy, the cost is effectively controlled and the performance is optimized and improved, making the equipment more stable and reliable in practical applications. 4. By setting up reasonable loading devices and calibration devices, and equipping with a complete electronic control system, the automation and precise control of the torque application and measurement process are realized, reducing the complexity and errors of manual operation; by setting up the initial adjustment and secondary adjustment processes, the gaps between components, standard force sensors and connectors, deformation of the machine base and reaction frame and other asymmetric factors can be quickly and effectively eliminated to ensure measurement accuracy; in addition, due to the optimization of the force on key components, the loss of components is reduced, the maintenance cost and maintenance frequency are reduced, the use efficiency of the equipment is improved, and great convenience is brought to users.

Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 for Figure 1 Explosion diagram of Figure 3 for Figure 2 A magnified schematic diagram of region A; Figure 4 for Figure 1 Schematic diagram from another perspective; Figure 5 It is another state schematic diagram of the present invention; Figure 6 for Figure 4 Explosion diagram of Figure 7 for Figure 1 Another perspective diagram of .

[0018] The reference numerals are as follows: 1. Working base; 11. Slide rail; 2. Loading device; 21. First connector; 22. Slide groove; 23. Matching part; 231. Control part; 3. Calibration device; 31. Second connector; 32. Lever seat; 33. Lever mechanism; 331. Lever arm; 332. Lever loading end; 333. Weight loading mechanism; 34. Bearing part; 35. Bracket; 351. Reaction frame fixing seat; 3511. Lever leveling device; 36. Reaction frame steel belt; 37. Base steel belt; 38. Force measuring piece; 4. Torque device to be tested. [Specific implementation method] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Specific embodiments, combined with Figures 1 to 7 As shown, the technical solution of the present invention is further described, a constrained torque calibration device, used for verifying and calibrating the inspected product, includes a working base 1, one side of the working base 1 is provided with a loading device 2 for applying torque, the other side of the working base 1 is provided with a calibration device 3 for cooperating with the loading device 2 to verify and calibrate the inspected product, the loading device 2 and the calibration device 3 are both electrically connected to an electronic control system for controlling loading, the loading device 2 transmits the torque through the inspected product to one side of the calibration device 3, the calibration device 3 transmits the actual measured torque value to the electronic control system for comparison with the torque value applied by the loading device 2, so as to calibrate the torque condition of the inspected product.

[0021] In this embodiment, the torque device 4 used for verification and calibration is used as the product to be tested, and is disposed between the loading device 2 and the calibration device 3 , and is coaxial with the loading device 2 and the calibration device 3 .

[0022] In this implementation case, Figures 1 to 7As shown, the loading device 2 is provided with a first connector 21 coaxial with the loading device 2 on one side close to the calibration device 3, and the calibration device 3 is provided with a second connector 31 corresponding to the first connector 21 on one side close to the loading device 2, and the detected torque device 4 is arranged between the loading device 2 and the calibration device 3 through the first connector 21 and the second connector 31. The first connector 21 and the second connector 31 are replaceable and selectively arranged to ensure the installation of the detected torque device 4, and at the same time ensure that the loading device 2, the calibration device 3 and the detected torque device 4 are coaxial, so as to ensure that the calibration work is stable and accurate.

[0023] Furthermore, if Figure 2 , Figure 3 , Figure 6 As shown, the calibration device 3 includes a lever arm seat 32 and a lever mechanism 33 disposed on the lever arm seat 32 and coaxially driven by the second connector 31. The lever mechanism 33 includes two lever arms 331 equidistant from the axis of the second connector 31. The lever mechanism 33 is provided with a lever arm loading end 332 at one end of the lever arm 331 away from the second connector 31. As a preferred embodiment of the present invention but not a limitation, the two lever arms 331 are on the same straight line. Optionally, the two lever arms 331 can also be adjusted to a horizontal position to reduce the friction torque at the lever arm fulcrum end, thereby reducing the key factor affecting the torque measurement accuracy. At the same time, when the lever mechanism 33 is an equal-arm lever and a constrained design, it is possible to constrain the lever mechanism 33 by two parallel forces of equal size, opposite direction but not collinear, theoretically eliminating the friction torque at the lever arm end and reducing the key factor affecting the torque measurement accuracy.

[0024] In this process, the single-end load of the lever is reduced by half compared to the traditional torque standard machine of the same specification. This advantage not only effectively reduces the stress on the lever and related components, improves the durability and stability of the equipment, but also makes it possible to manufacture torque standard machines with ultra-large torque values. In addition, by optimizing the lever structure and mechanical design, this equipment can easily meet the measurement needs of greater torque while ensuring measurement accuracy, breaking through the limitations of traditional torque calibration equipment in the measurement range, and can be widely used in large-scale machinery manufacturing, heavy engineering construction and other fields that have strict requirements for ultra-large torque measurement.

[0025] During this driving process, the electronic control system controls the loading device 2 to input torque, and the loading device 2 transmits the torque to the tested torque device 4 located between the loading device 2 and the calibration device 3 through the first connector 21. After passing through the tested torque device 4, the torque is transmitted to the calibration device 3 through the second connector 31. At this time, the torque will drive the lever mechanism 33 to tilt.

[0026] In this process, by setting up the loading device 2 and the calibration device 3 reasonably and equipping a perfect electronic control system, the automation and precise control of the torque application and measurement process are realized, reducing the complexity and error of manual operation. In terms of force symmetry adjustment, a scientific initial adjustment and secondary adjustment process is designed, which can quickly and effectively eliminate asymmetric factors such as the gap between components, standard force sensors and connectors, and deformation of the base and reaction frame to ensure measurement accuracy. Due to the optimization of the force on key components, the loss of components is reduced, the maintenance cost and maintenance frequency are reduced, the use efficiency of the equipment is improved, and great convenience is brought to users.

[0027] In addition, the second connector 31 constitutes the fulcrum of the lever mechanism 33, that is, the lever support structure. Since the two lever arms 331 are of equal length, other forces except gravity between the lever arms 331 and the second connector 31 can be eliminated or reduced after receiving loading.

[0028] Optionally, a bearing member 34 is provided between the second connector 31 and the lever mechanism 33. As a preferred embodiment of the present invention but not a limitation, the bearing member 34 adopts a rolling bearing. Through the lever balance principle and the use of rolling bearing support, other forces except gravity between the lever arm 331 and the second connector 31 can be reduced.

[0029] Furthermore, the calibration device 3 is provided with a bracket 35 at a position corresponding to the position of the force arm loading end 332, and the bracket 35 is provided with a reaction frame fixing seat 351 on the side away from the working base 1, one of the lever arms 331 is provided with a reaction frame steel belt 36 connected to the reaction frame fixing seat 351, and the other lever arm 331 is provided with a base steel belt 37 connected to the working base 1, and the reaction frame steel belt 36 and the base steel belt 37 are both provided with force measuring pieces 38 for measuring force, and the force measuring pieces 38 are electrically connected to the electronic control system.

[0030] When the electronic control system controls the loading device 2 to input torque, the loading device 2 transmits the torque to the tested torque device 4 located between the loading device 2 and the calibration device 3 through the first connector 21. After passing through the tested torque device 4, the torque is transmitted to the calibration device 3 through the second connector 31. At this time, the torque will drive the lever mechanism 33 to tilt, and the force measuring piece 38 will measure the force generated by the corresponding side. Combined with the length of the lever arm 331, the torque at the end of the calibration device 3 can be calculated.

[0031] Since the torque generated by the loading device 2 is transmitted to the calibration device 3 via the detected torque device 4, the output of the calibration device 3 is a torque couple, thereby utilizing two parallel forces of equal magnitude and opposite direction but not collinear to constrain the lever arm 331, so that the load on one side of the lever arm 331 is reduced by half compared with the traditional torque standard machine of the same specification. Therefore, an ultra-large torque standard machine can be produced by adjusting the lever arm 331 and the force measuring piece 38 of the torque calibration equipment.

[0032] Furthermore, as a preferred implementation mode of the present invention but not a limitation, the force measuring piece 38 adopts a standard dynamometer for measuring the force signals of the two lever arms 331, which is more convenient and accurate than measuring the force by weight loading. At the same time, the force measuring piece 38 can form feedback with the electronic control system and the loading device 2, and can provide convenience for the calibration of the torque device 4 to be tested.

[0033] Alternatively, if Figure 7 As shown, the two lever arms 331 are both provided with a reaction frame steel belt 36 connected to the reaction frame fixing seat 351 and a base steel belt 37 connected to the working base 1, and the reaction frame steel belt 36 and the base steel belt 37 are both provided with a force measuring piece 38 for measuring force.

[0034] Furthermore, a force arm leveling device 3511 for adjusting the balance of the lever mechanism 33 is provided on one side of the reaction frame fixing seat 351. The force arm leveling device 3511 can ensure that the lever mechanism 33 maintains balance before calibrating the tested torque device 4, thereby preventing the initial deflection of the lever mechanism 33 from affecting the torque calibration.

[0035] Optionally, the lever mechanism 33 is provided with a weight loading mechanism 333 for adjusting the symmetry of the lever on the lever arm 331, which is deviated from the force arm loading end 332. As a preferred implementation mode of the present invention but not a limitation, two weight loading mechanisms 333 are provided, and the two weight loading mechanisms 333 are symmetrically arranged on both sides of the lever arm 331.

[0036] In the process of adjusting the symmetry of the lever force, when the lever arm 331 on one side tilts downward, the weight can be loaded onto the weight loading mechanism 333 located on the lever arm 331 on the other side; when the lever arm 331 on one side tilts upward, the weight can be loaded onto the weight loading mechanism 333 located on the same side of the lever arm 331; in addition, the inclination of the lever can be adjusted by adjusting the two weight loading mechanisms 333 at the same time, so that the lever is in a horizontal state, which provides convenience for the subsequent measurement of the calibration torque.

[0037] Furthermore, if Figure 2 , Figure 3, Figure 7 As shown, the reaction frame steel belt 36 is arranged on the side of the force arm loading end 332 away from the working base 1, and the base steel belt 37 is arranged on the side of the force arm loading end 332 close to the working base 1, and the force arm loading end 332 is an arc-shaped structure.

[0038] By adopting the arc-shaped force arm loading fulcrum design, the lever is allowed to deflect at a certain angle when the torque standard machine is running. Without the need for a complex dynamic horizontal adjustment system, the force arm length of the lever arm 331 can be ensured to remain stable. At the same time, the installation redundancy of the force sensor is increased, and the size change of the lever arm caused by the installation error of the standard force sensor is effectively reduced. At the same time, the lever arm 331 adopts a constrained design, and the bearing member 34 is arranged on its side. Optionally, the bearing member 34 is a rolling bearing, which is supported by a rolling bearing to significantly improve the measurement sensitivity. These innovative designs achieve effective cost control and optimized performance while ensuring measurement accuracy, making the equipment more stable and reliable in practical applications.

[0039] When the lever mechanism 33 tilts, the force arm loading end 332 drives the reaction frame steel belt 36 and the base steel belt 37 to move. In this process, the reaction frame steel belt 36 and the base steel belt 37 fit the arc-shaped force arm loading end 332, which can ensure that the force arm length and the point of action of the force applied to the force measuring member 38 remain unchanged when the lever mechanism 33 tilts, and can reduce the influence of the force measuring member 38 on the lever arm 331.

[0040] In this implementation case, the loading device 2 is composed of a servo motor and a reducer. When the servo motor drives the reducer to rotate, the rotation of the reducer drives the first connector 21 to rotate. The reducer can make the loading process smoother and the control more precise, providing convenience for the calibration of the tested torque device 4.

[0041] In this embodiment, the working base 1 is provided with a slide rail 11, and the loading device 2 is provided with a slide groove 22 corresponding to the slide rail 11 on the side close to the working base 1. When installing the detected torque device 4, the loading device 2 can be moved by the cooperation between the slide rail 11 and the slide groove 22 to place and install the detected torque device 4, which provides convenience for installing the detected torque device 4.

[0042] Furthermore, a mating part 23 that cooperates with the working base 1 is provided on one side of the loading device 2, and the mating part 23 includes a control part 231 for controlling the loading device 2 to be fixed or movable relative to the working base 1. As a preferred implementation mode of this scheme but not a limitation, the mating part 23 can cooperate the loading device 2 and the working base 1, and the control part 231 is a screw structure.

[0043] In this process, when the control part 231 is in a loosened state, the loading device 2 can be moved to facilitate adjustment of the position of the loading device 2 to install the tested torque device 4; when the control part 231 is in a tightened state, the relative position of the loading device 2 and the working base 1 is fixed, which provides convenience for loading the loading device 2 and measuring the calibration device 3.

[0044] The working principle of this embodiment is as follows: The present invention proposes a constrained torque calibration device, in which the electronic control system applies torque through the loading device 2, and transmits the torque to the calibration device 3 through the torque device 4. The calibration device 3 uses a lever structure to form a torque couple, and transmits the force values ​​at both ends of the lever arm 331 to the electronic control system, so as to realize the torque acting on the two lever arms 331 and transmitting it to the electronic control system for calibration. The specific principle is as follows: When the electronic control system controls the loading device 2 to input torque, the loading device 2 transmits the torque to the tested torque device 4 located between the loading device 2 and the calibration device 3 through the first connector 21. After passing through the tested torque device 4, the torque is transmitted to the calibration device 3 through the second connector 31. At this time, the torque will drive the lever mechanism 33 to tilt, and the force measuring piece 38 will measure the force generated by the corresponding side. Combined with the length of the lever arm 331, the torque at the end of the calibration device 3 can be calculated.

[0045] During this process, the torque is output as a couple moment through a lever mechanism 33 composed of two lever arms 331 of equal length and located on the same straight line, thereby utilizing two parallel forces of equal magnitude and opposite direction but not collinear to constrain the lever arm 331, thereby ensuring the measurement of the torque at the end of the calibration device 3 and also reducing the load on the single-sided lever arm 331.

Claims

1. A constrained torque calibration device, used for verifying and calibrating a product under test, characterized in that: The invention comprises a working base (1), wherein one side of the working base (1) is provided with a loading device (2) for applying torque, and the other side of the working base (1) is provided with a calibration device (3) for cooperating with the loading device (2) to calibrate the inspected product. The loading device (2) and the calibration device (3) are both connected to an electronic control system. The calibration device (3) comprises a lever arm seat (32) and an equal arm length lever mechanism (33) coaxial with the inspected product and arranged on the lever arm seat (32). When the loading device (2) applies torque, the torque signal is transmitted to the calibration device (3) via the inspected product, reflected by the lever mechanism (33) and fed back to the electronic control system for calibration.

2. The constrained torque calibration device according to claim 1, characterized in that: A first connector (21) coaxial with the loading device (2) is provided on a side of the loading device (2) close to the calibration device (3); a second connector (31) corresponding to the first connector (21) is provided on a side of the calibration device (3) close to the loading device (2); the inspected product is arranged between the loading device (2) and the calibration device (3) via the first connector (21) and the second connector (31); and the lever mechanism (33) is coaxially driven by the second connector (31).

3. The constrained torque calibration device according to claim 2, characterized in that: The lever mechanism (33) comprises two lever arms (331) which are equidistant from the axis of the second connector (31) and are located on the same straight line. The lever mechanism (33) is provided with a force arm loading end (332) at one end of the lever arm (331) which is away from the second connector (31).

4. The constrained torque calibration device according to claim 3, characterized in that: The calibration device (3) is provided with a bracket (35) at a position corresponding to the position of the force arm loading end (332); a reaction frame fixing seat (351) is provided on the side of the bracket (35) away from the working base (1); one of the lever arms (331) is provided with a reaction frame steel belt (36) connected to the reaction frame fixing seat (351); the other lever arm (331) is provided with a base steel belt (37) connected to the working base (1); the reaction frame steel belt (36) and the base steel belt (37) are both provided with a force measuring piece (38) for measuring force; the force measuring piece (38) is electrically connected to an electric control system.

5. The constrained torque calibration device according to claim 4, characterized in that: The reaction frame steel belt (36) is arranged on a side of the force arm loading end (332) away from the working base (1), and the base steel belt (37) is arranged on a side of the force arm loading end (332) close to the working base (1); the force arm loading end (332) is an arc-shaped structure.

6. The constrained torque calibration device according to claim 2, characterized in that: A bearing member (34) is provided between the second connector (31) and the lever mechanism (33).

7. The constrained torque calibration device according to claim 3, characterized in that: The lever mechanism (33) is provided with a weight loading mechanism (333) for adjusting the symmetry of the lever at a position on the lever arm (331) that deviates from the force arm loading end (332).

8. The constrained torque calibration device according to claim 4, characterized in that: The force measuring piece (38) adopts a standard force measuring instrument for measuring the force signals of the two lever arms (331).

9. The constrained torque calibration device according to claim 4, characterized in that: A force arm leveling device (3511) for adjusting the balance of the lever mechanism (33) is provided on one side of the reaction frame fixing seat (351).

10. The constrained torque calibration device according to claim 1, characterized in that: The working base (1) is provided with a slide rail (11), a side of the loading device (2) close to the working base (1) is provided with a slide groove (22) corresponding to the slide rail (11), and a side of the loading device (2) is provided with a matching piece (23) matching with the working base (1), and the matching piece (23) includes a control piece (231) for controlling the loading device (2) to be fixed or movable relative to the working base (1).

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