Constrained torque calibration device

Abstract

The utility model discloses constraint type torque calibration equipment, which is used for verifying and calibrating a detected product and comprises a working base, one side of the working base is provided with a loading device used for applying torque, and the other side of the working base is provided with a calibration device used for being matched with the loading device to measure and calibrate the detected product. The loading device and the calibration device are both connected with the electric control system, and the calibration device comprises a force arm seat and a lever mechanism which is arranged on the force arm seat, is coaxial with a detected product and is used for outputting a torque signal as a force signal and feeding back the force signal to the electric control system. 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

[0001] The utility model relates to torque calibration technical field especially relates to a restraint type torque calibration equipment.

BACKGROUND

[0002] Torque standard machine is mainly used for detecting or calibrating torque sensor, hydraulic wrench detection device, torque plate detection instrument etc.

[0003] But at present, static weight type torque standard machine, lever type torque standard machine are widely welcomed in the market with the advantages of simple principle, structure form easy to realize, relatively higher measurement accuracy, but usually suitable for small and medium torque value transmission and traceability, reference torque standard machine has wide measurement range, but reference torque sensor accuracy grade is difficult to reach 0.1 level or more, and value traceability is also more difficult, and is suitable for large torque work torque sensor value transmission and traceability, force sensor type torque standard machine adopts force sensor and lever combination, realizes torque measurement, has relatively low cost, torque traceability is simple, measurement range is wide, but this kind of torque standard machine has higher requirements to torque control and structure.

UTILITARY MODEL CONTENTS

[0004] To solve the above technical problems, the utility model provides a restraint type torque calibration equipment.

[0005] The utility model realizes by following technical scheme:

[0006] A restraint type torque calibration equipment is used for detecting and calibrating the detected product, comprising a working base, the working base one side is equipped with the loading device for exerting torque, the working base other side is equipped with the calibration device for cooperating with the loading device and measuring and calibrating the detected product, the loading device, the calibration device all are connected with the electric control system, the calibration device includes the force arm seat and the equal arm length lever mechanism for outputting torque signal as force signal and feeding back to the electric control system with the detected product coaxial on the force arm seat.

[0007] The constrained torque calibration device as described above, wherein the loading device is provided with a first coupling coaxial with the loading device on the side close to the calibration device, the calibration device is provided with a second coupling corresponding to the first coupling on the side close to the loading device, the product under test is arranged between the loading device and the calibration device through the first coupling and the second coupling, and the lever mechanism is coaxially driven by the second coupling.

[0008] The constrained torque calibration device as described above, wherein the lever mechanism comprises two lever arms in the same straight line and equidistant from the axis of the second coupling, and the lever mechanism is provided with a force arm loading end on the end of the lever arms away from the second coupling.

[0009] The constrained torque calibration device as described above, wherein the calibration device is provided with a support corresponding to the position of the force arm loading end, the support is provided with a counterforce frame fixing seat on the side away from the working base, one of the lever arms is provided with a counterforce frame steel belt connected with the counterforce frame fixing seat, and the other lever arm is provided with a base steel belt connected with the working base, the counterforce frame steel belt and the base steel belt are both provided with a force measuring element for measuring force, and the force measuring element is electrically connected with the electric control system.

[0010] The constrained torque calibration device as described above, wherein the counterforce 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 in a circular arc structure.

[0011] The constrained torque calibration device as described above, wherein a bearing element is arranged between the second coupling and the lever mechanism.

[0012] The constrained torque calibration device as described above, wherein the lever mechanism is provided with a weight loading mechanism for adjusting the symmetry of the lever on the lever arms deviated from the force arm loading end.

[0013] The constrained torque calibration device as described above, wherein the force measuring element is a standard force measuring instrument for measuring the force signals of the two lever arms.

[0014] The constrained torque calibration device as described above, wherein the side of the counterforce frame fixing seat is provided with a force arm leveling device for adjusting the balance of the lever mechanism.

[0015] The constrained torque calibration device as described above, wherein the working base is provided with a slide rail, the loading device is provided with a sliding groove corresponding to the slide rail on the side close to the working base, the loading device is provided with a matching element matched with the working base on one side, and the matching element comprises a control element for controlling the fixing or movement of the loading device relative to the working base.

[0016] Compared with the prior art, the constraint type torque calibration equipment has the following beneficial effects:

[0017] 1. The loading device applies torque to the detected product, and the torque signal is reflected and shared into force signals at both ends of the lever mechanism through the lever mechanism, so that the lever mechanism is constrained by two parallel forces with equal size and opposite direction but not collinear, the friction torque at the end of the force arm is theoretically eliminated, and the key factor affecting the accuracy of torque measurement is reduced.

[0018] 2. The lever structure is an equal-arm lever, which can constrain the lever mechanism by two parallel forces with equal size and opposite direction but not collinear, so that the torque signal is reflected, and 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 borne by the lever and related components, improves the durability and stability of the equipment, but also provides a theoretical basis for manufacturing a torque standard machine with an ultra-large torque value.

[0019] 3. The force arm loading end is in a circular arc structure, which allows the lever to have a certain angle of deflection during operation of the torque standard machine, without the need for a complex dynamic horizontal adjustment system, so as to ensure that the length of the force arm of the lever arm remains stable at all times; at the same time, the installation redundancy of the load cell is increased, the size change of the lever force arm caused by installation error of the standard load cell is effectively reduced, and the measurement sensitivity is significantly improved through the support of the rolling bearing, so as to ensure the measurement accuracy, effectively control the cost, and optimize the performance, so that the equipment is more stable and reliable in actual application.

[0020] 4. By setting reasonable loading devices and calibration devices, and by equipping a perfect electric control system, the torque application and measurement process is automated and precisely controlled, the complexity and error of manual operation are reduced; by setting initial adjustment and secondary adjustment processes, the asymmetry factors such as the gap between components, the standard load cell and connecting pieces, the deformation of the base and the reaction frame, etc. can be quickly and effectively eliminated, so as to ensure the measurement accuracy; in addition, due to the optimization of the stress of the key components, the wear of the components is reduced, the maintenance cost and frequency are reduced, the use efficiency of the equipment is improved, and great convenience is brought to the users.

DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows.

[0022] Figure 1 It is a schematic view of the three-dimensional structure of the present application;

[0023] Figure 2 It is Figure 1 a schematic view of the explosion.

[0024] Figure 3 is a schematic view of the A area of Figure 2 ;

[0025] Figure 4 is another perspective view of Figure 1 ;

[0026] Figure 5 is another state schematic view of the utility model;

[0027] Figure 6 is an exploded schematic view of Figure 4 ;

[0028] Figure 7 is another perspective view of Figure 1 .

[0029] Wherein, the reference signs are as follows:

[0030] 1, working base; 11, slide rail; 2, loading device; 21, first coupler; 22, sliding groove; 23, matching piece; 231, control piece; 3, calibration device; 31, second coupler; 32, force arm seat; 33, lever mechanism; 331, lever arm; 332, force arm loading end; 333, weight loading mechanism; 34, bearing piece; 35, support; 351, counterforce frame fixing seat; 3511, force arm leveling device; 36, counterforce frame steel belt; 37, base steel belt; 38, force measuring piece; 4, being detected torque device.

DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical schemes and beneficial effects solved by the utility model clearer and more apparent, the utility model is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0032] Specific examples, in combination Figures 1 to 7 The technical scheme of the utility model is further described, a constraint type torque calibration equipment for calibrating and detecting a detected product, comprising 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 calibrate and detect the detected product, the loading device 2 and the calibration device 3 are electrically connected with an electric control system for controlling loading, torque is conducted to one side of the calibration device 3 through the detected product by the loading device 2, the calibration device 3 transmits the actual measured torque value to the electric control system, and the applied torque value of the loading device 2 is compared, so as to calibrate the torque condition of the detected product.

[0033] In the embodiment, the tested torque device 4 for verification and calibration is arranged between the loading device 2 and the calibration device 3 as a tested product, and is coaxial with the loading device 2 and the calibration device 3.

[0034] In the embodiment, as shown in the figure, Figures 1 to 7 the loading device 2 is provided with a first coupler 21 coaxial with the loading device 2 on the side close to the calibration device 3, the calibration device 3 is provided with a second coupler 31 corresponding to the first coupler 21 on the side close to the loading device 2, and the tested torque device 4 is arranged between the loading device 2 and the calibration device 3 through the first coupler 21 and the second coupler 31. The first coupler 21 and the second coupler 31 can be arranged in a replaceable and selectable manner, which guarantees the installation of the tested torque device 4 and the coaxial arrangement of the loading device 2, the calibration device 3 and the tested torque device 4, so as to guarantee the stable and accurate calibration.

[0035] Further, as shown in the figure, Figure 2 , Figure 3 , Figure 6 the calibration device 3 includes a force arm seat 32 and a lever mechanism 33 arranged on the force arm seat 32 and coaxially driven by the second coupler 31, the lever mechanism 33 includes two lever arms 331 with equal distance from the axis of the second coupler 31, and the lever mechanism 33 is provided with a force arm loading end 332 at the end of the lever arm 331 away from the second coupler 31. As a preferred embodiment of the scheme, but not limited to, the two lever arms 331 are on the same straight line, and alternatively, the two lever arms 331 can also be adjusted to be horizontal, so as to reduce the friction torque of the force arm fulcrum end, thereby reducing the key factor affecting the accuracy of torque measurement. At the same time, when the lever mechanism 33 is an equal-arm lever and a constraint design, the lever mechanism 33 can be constrained by two parallel forces with equal size and opposite direction but not collinear, which theoretically eliminates the friction torque of the force arm end and reduces the key factor affecting the accuracy of torque measurement.

[0036] 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 borne by the lever and related components, improves the durability and stability of the equipment, but also provides the possibility of manufacturing a torque standard machine with an ultra-large torque value. In addition, by optimizing the lever structure and mechanical design, the device can easily meet the measurement demand of larger torque under the premise of ensuring measurement accuracy, breaking through the limitation of traditional torque calibration equipment in measurement range, and can be widely used in fields such as large-scale mechanical manufacturing and heavy engineering construction which have strict requirements for ultra-large torque measurement.

[0037] In the driving process, the electric control system controls the input torque of the loading device 2, the loading device 2 transmits the torque to the detected torque device 4 between the loading device 2 and the calibration device 3 through the first coupling 21, and the torque is transmitted to the calibration device 3 through the second coupling 31 after passing through the detected torque device 4, at this time, the torque drives the lever mechanism 33 to tilt.

[0038] In this process, by setting reasonable loading device 2 and calibration device 3, and equipped with perfect electric control system, the automation and accurate control of torque application and measurement process are realized, the complexity and error of manual operation are reduced. In the aspect of force symmetry adjustment, scientific initial adjustment and secondary adjustment process is designed, which can quickly and effectively eliminate the gap between each part, standard force sensor and connecting piece, deformation of machine base and counterforce frame and other asymmetric factors, and ensure the measurement accuracy. Due to the optimization of the force of the key components, the wear of the components is reduced, the maintenance cost and frequency are reduced, the use efficiency of the equipment is improved, and great convenience is brought to the users.

[0039] In addition, the second coupling 31 constitutes the fulcrum of the lever mechanism 33, that is, the lever support structure, since the two lever arms 331 are equal in length, the other forces between the lever arm 331 and the second coupling 31 except gravity can be eliminated or reduced after receiving the load.

[0040] Optionally, a bearing piece 34 is arranged between the second coupling 31 and the lever mechanism 33, which is a preferred embodiment of the present application but not limited, the bearing piece 34 adopts a rolling bearing, which can reduce the other forces between the lever arm 331 and the second coupling 31 except gravity by the principle of lever balance and the cooperation of rolling bearing support.

[0041] Further, the calibration device 3 is provided with a support 35 at the position corresponding to the force arm loading end 332, the support 35 is provided with a counterforce frame fixing seat 351 away from the working base 1, one of the lever arms 331 is provided with a counterforce frame steel belt 36 connected with the counterforce frame fixing seat 351, and the other lever arm 331 is provided with a base steel belt 37 connected with the working base 1, the counterforce frame steel belt 36 and the base steel belt 37 are provided with a force measuring piece 38 for measuring force, and the force measuring piece 38 is electrically connected with the electric control system.

[0042] When the electric control system controls the input torque of the loading device 2, the loading device 2 transmits the torque to the detected torque device 4 between the loading device 2 and the calibration device 3 through the first coupling 21, and the torque is transmitted to the calibration device 3 through the second coupling 31 after passing through the detected torque device 4. At this time, the torque drives the lever mechanism 33 to tilt, and the force generated on the corresponding side is measured by the force measuring element 38, and the torque at the end of the calibration device 3 can be calculated by combining the length of the lever arm 331.

[0043] Since the torque generated by the loading device 2 is transmitted to the calibration device 3 through the detected torque device 4, the calibration device 3 outputs a couple torque, which realizes the use of two parallel forces with equal size and opposite direction but not collinear to constrain the lever arm 331, so that the unilateral lever arm 331 reduces the load 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 structure of the lever arm 331 and the force measuring element 38 of the torque calibration equipment.

[0044] Further, as a preferred embodiment of the present scheme but not limited, the force measuring element 38 adopts a standard force measuring instrument for measuring the force signals of the two lever arms 331, which is more convenient and accurate than using a weight load to measure the force. At the same time, the force measuring element 38 can form a feedback with the electric control system and the loading device 2, and can provide convenience for the calibration of the detected torque device 4.

[0045] Optionally, as shown in Figure 7 Both of the two lever arms 331 are provided with a counterforce frame steel belt 36 connected with the counterforce frame fixing seat 351 and a base steel belt 37 connected with the working base 1, and the counterforce frame steel belt 36 and the base steel belt 37 are both provided with a force measuring element 38 for measuring force.

[0046] Further, one side of the counterforce frame fixing seat 351 is provided with a force arm adjusting device 3511 for adjusting the balance of the lever mechanism 33, which can ensure that the lever mechanism 33 remains balanced before calibrating the detected torque device 4, avoiding the initial deflection of the lever mechanism 33 affecting the torque calibration.

[0047] 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 deviating from the force arm loading end 332. As a preferred embodiment of the present scheme but not limited, the weight loading mechanism 333 is provided with two, and the two weight loading mechanisms 333 are symmetrically arranged on both sides of the lever arm 331.

[0048] In the process of adjusting the symmetry of the lever force, when one side of the lever arm 331 is inclined downward, the weight loading mechanism 333 located on the other side of the lever arm 331 can be loaded with weights; when one side of the lever arm 331 is inclined upward, the weight loading mechanism 333 located on the same side of the lever arm 331 can be loaded with weights; in addition, the inclination of the lever can also be adjusted by simultaneously adjusting the two weight loading mechanisms 333 together to adjust the inclination of the lever to a horizontal state, providing convenience for subsequent determination of the calibration torque.

[0049] Further, as shown in Figure 2 、 Figure 3 、 Figure 7 The counterforce frame steel belt 36 is arranged on the side of the force arm loading end 332 away from the working base 1, 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 in a circular arc structure.

[0050] By adopting the circular arc force arm loading fulcrum design, when the torque standard machine is running, the lever can be allowed to have a certain angle of deflection, without the need for a complex dynamic horizontal adjustment system, so as to ensure that the length of the force arm of the lever arm 331 always remains stable. At the same time, the installation redundancy of the force sensor is increased, and the change in the size of the lever force arm caused by the installation error of the standard force sensor is effectively reduced. At the same time, the lever arm 331 adopts a constraint design, and the bearing 34 is arranged on the side thereof. Optionally, the bearing 34 is a rolling bearing, which is matched with a rolling bearing support, thereby significantly improving the measurement sensitivity. These innovative designs not only ensure the measurement accuracy, but also effectively control the cost and optimize the performance, so that the equipment is more stable and reliable in actual application.

[0051] When the lever mechanism 33 is inclined, the force arm loading end 332 drives the counterforce frame steel belt 36 and the base steel belt 37 to act. In this process, the counterforce frame steel belt 36 and the base steel belt 37 are attached to the circular arc-shaped force arm loading end 332, which can ensure that the length of the force arm and the point of action of the force applied to the force measuring element 38 remain unchanged when the lever mechanism 33 is inclined, thereby reducing the influence of the force measuring element 38 on the lever arm 331.

[0052] In the embodiment, the loading device 2 is composed of a servo motor and a speed reducer. When the servo motor drives the speed reducer to rotate, the rotation of the speed reducer drives the first coupler 21 to rotate. The speed reducer can make the loading process smoother and the control more accurate, thereby providing convenience for the calibration of the detected torque device 4.

[0053] In the embodiment, the working base 1 is provided with a sliding rail 11, and the loading device 2 is provided with a sliding groove 22 corresponding to the sliding rail 11 on the side close to the working base 1. When the detected torque device 4 is installed, the loading device 2 can be moved through cooperation of the sliding rail 11 and the sliding groove 22 to place and install the detected torque device 4, thereby providing convenience for installation of the detected torque device 4.

[0054] Further, the loading device 2 is provided with a matching part 23 matched with the working base 1, and the matching part 23 comprises a control part 231 for controlling fixing or movement of the loading device 2 relative to the working base 1. As a preferred embodiment, the matching part 23 can match the loading device 2 and the working base 1, and the control part 231 is a screw structure.

[0055] 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 for installation of the detected torque device 4; when the control part 231 is in a screwed state, the relative position of the loading device 2 and the working base 1 is fixed, thereby providing convenience for loading of the loading device 2 and measurement of the calibration device 3.

[0056] The working principle of the embodiment is as follows:

[0057] The electric control system applies torque through the loading device 2, the torque is transmitted to the calibration device 3 through the detected torque device 4, the calibration device 3 adopts a lever structure to form a couple moment, and the force values at both ends of the lever arm 331 are transmitted to the electric control system to realize application of torque to the two lever arms 331 and transmission to the electric control system for calibration.

[0058] When the electric control system controls the loading device 2 to input torque, the loading device 2 transmits the torque to the detected torque device 4 between the loading device 2 and the calibration device 3 through the first coupling 21, the torque is transmitted to the calibration device 3 through the second coupling 31 after passing through the detected torque device 4, at this time, the torque drives the lever mechanism 33 to tilt, the force generated on the corresponding side is measured by the force measuring part 38, and the moment at the end of the calibration device 3 can be calculated according to the length of the lever arm 331.

[0059] In this process, the torque is output as a couple moment by the lever mechanism 33 composed of two lever arms 331 with equal length and on the same straight line, the lever arm 331 is constrained by two parallel forces with equal size and opposite direction but not collinear, the torque at the end of the calibration device 3 is measured, and the load on the single lever arm 331 is reduced.

Claims

1. A constraint torque calibration device for verifying and calibrating a tested product, characterized in that, The utility model provides a kind of torque testing device, including work base (1), the work base (1) one side is equipped with for applying torque loading device (2), the work base (1) other side is equipped with for cooperating with the loading device (2) calibration device (3) for determining and calibrating the product to be tested, the loading device (2), the calibration device (3) are connected with electric control system, the calibration device (3) includes force arm seat (32) and be equipped with the force arm seat (32) on with product to be tested coaxial for torque signal is output as force signal and feedback to electric control system equal arm length lever mechanism (33).

2. The constrained torque calibration apparatus of claim 1, wherein, The loading device (2) is equipped with the first coupler (21) coaxial with the loading device (2) on the side close to the calibration device (3), the calibration device (3) is equipped with the second coupler (31) corresponding to the first coupler (21) on the side close to the loading device (2), the product to be tested is arranged between the loading device (2) and the calibration device (3) through the first coupler (21) and the second coupler (31), and the lever mechanism (33) is coaxially driven by the second coupler (31).

3. The constrained torque calibration apparatus of claim 2, wherein, The lever mechanism (33) includes two lever arms (331) on the same straight line with equal distance from the axis of the second coupler (31), and the lever mechanism (33) is provided with a force arm loading end (332) at one end of the lever arm (331) away from the second coupler (31).

4. The constrained torque calibration apparatus of claim 3, wherein, The calibration device (3) is provided with a bracket (35) at a position corresponding to the force arm loading end (332), the bracket (35) is provided with a counterforce frame fixing seat (351) on the side away from the work base (1), one of the lever arms (331) is provided with a counterforce frame steel belt (36) connected with the counterforce frame fixing seat (351), and the other lever arm (331) is provided with a base steel belt (37) connected with the work base (1), and the counterforce frame steel belt (36) and the base steel belt (37) are both provided with a force measuring element (38) for measuring force, and the force measuring element (38) is electrically connected with the electric control system.

5. The constrained torque calibration apparatus of claim 4, wherein, The counterforce frame steel belt (36) is arranged on the side away from the work base (1) of the force arm loading end (332), the base steel belt (37) is arranged on the side close to the work base (1) of the force arm loading end (332), and the force arm loading end (332) is in a circular arc structure.

6. The constrained torque calibration apparatus of claim 2, wherein, A bearing element (34) is arranged between the second coupler (31) and the lever mechanism (33).

7. The constrained torque calibration apparatus of claim 3, wherein, The lever mechanism (33) is provided with a weight loading mechanism (333) for adjusting the symmetry of the lever on the lever arm (331) deviating from the force arm loading end (332).

8. The constrained torque calibration apparatus of claim 4, wherein, The force measuring element (38) is a standard force gauge for measuring the force signals of the two lever arms (331).

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

10. The constrained torque calibration apparatus of claim 1, wherein, The working base (1) is provided with a sliding rail (11), the loading device (2) is provided with a sliding groove (22) corresponding to the sliding rail (11) on the side close to the working base (1), and the loading device (2) is provided with a matching part (23) matched with the working base (1) on one side, and the matching part (23) comprises a control part (231) for controlling the fixing or movement of the loading device (2) relative to the working base (1).

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