Torque measuring device adopting multiple force sensors with different ranges for in-situ measurement

Abstract

The invention provides a torque measuring device adopting a plurality of force sensors with different ranges for in-situ measurement. The torque measuring device comprises a lever supporting seat, a lever, a balance driving mechanism and a lever force applying mechanism. A lever force applying mechanism at the end part of the lever adopts a plurality of force sensors with different measuring ranges and an elastic device which are sequentially connected in series, when the force sensor with a smaller force value reaches the upper limit of the measuring range, an upper beam of a first pull frame is in contact with a corresponding limiting stop block, and then the force value applied is measured through the force sensor with a larger force value at the next stage; the torque measuring range of the torque measuring device is expanded, the measured values of different measuring range sections are measured through the high-precision force sensors of the corresponding measuring range sections, and the measuring precision is ensured. The force sensor module is arranged above the cutter bearing module in an overhead mode, it is ensured that the linear contact position of lever end stress application is kept constant, the stability of a lever force arm value is ensured, and the accuracy of a torque standard value is improved.

Description

Technical Field

[0001] The present invention relates to the field of metrology technology, and specifically to a torque measuring device that uses multiple force sensors with different ranges for in-situ measurement. Background Art

[0002] The lever-type torque standard machine is a type of standard machine that can measure relatively large torques. The common one is the deadweight torque standard machine, which uses the gravity of weights as the standard load and generates the standard torque after being amplified by the lever mechanism. Limited by the volume of the weights, and a large number of standard weights need to be configured, resulting in high costs and large occupied space.

[0003] With the development and progress of technology, there is currently a method of applying a standard load by using a force application mechanism and a high-precision force sensor at the end of the lever. Since no weights are required, it is more convenient to use and the occupied space is significantly reduced. This type of torque standard machine is gradually widely used. However, due to the limited range of the high-precision force sensor, the torque range that this type of torque standard machine can measure is relatively narrow. If the torque range is changed by replacing the force sensors with different ranges, recalibration is required, which takes a long time. Summary of the Invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the object of the present invention is to provide a torque measuring device that uses multiple force sensors with different ranges for in-situ measurement.

[0005] To achieve the above object, the technical solution adopted by the present invention to solve its technical problems is: a torque measuring device that uses multiple force sensors with different ranges for in-situ measurement, including:

[0006] A lever support base;

[0007] A lever, which is installed on the lever support base through a linear fulcrum;

[0008] A balance driving mechanism, which is located on the side of the lever and is used to keep the lever in a horizontal balance state;

[0009] Lever force - adding mechanism, which is used to apply a force to the end of the lever; the lever force - adding mechanism includes a blade module, a knife bearing module, a force sensor module, a first pulling frame and a force - applying mechanism; the blade module is fixedly installed on the upper surface of the lever end, the blade module includes a blade block, and the upper part of the blade block has a convex V - shaped blade part; the knife bearing module includes a knife bearing block, the lower surface of the knife bearing block has a concave V - shaped knife bearing groove, the knife bearing block is pressed above the blade block, and the V - shaped blade part is in linear contact with the V - shaped knife bearing groove; the force sensor module is installed above the knife bearing module, the upper beam of the first pulling frame is pressed above the force sensor module, and the force - applying mechanism applies a downward pulling force to the lower seat of the first pulling frame through a connecting piece; the force sensor module includes n force sensors with different ranges, n - 1 elastic devices and n - 1 limit blocks, where n≥2, the 1st force sensor to the nth force sensor are distributed from top to bottom in sequence and the maximum range values increase in sequence, the nth force sensor is installed on the upper surface of the knife bearing module, 1 elastic device is installed above each of the 1st to n - 1th force sensors, 1 limit block is installed below each of the 1st to n - 1th force sensors, and a stop surface is provided on the upper beam of the first pulling frame corresponding to the position of each limit block. When the force value applied to the force sensor module by the force - applying mechanism through the first pulling frame is greater than or equal to the maximum set force value of the n - 1th force sensor, the limit block below the n - 1th force sensor is pressed against the corresponding stop surface on the upper beam.

[0010] Adopting the solution of the present invention, the lever force - adding mechanism at the lever end uses multiple force sensors with different ranges and elastic devices connected in series in sequence. As the applied force value increases, the amount of shrinkage of the elastic device under force gradually increases. When the force sensor with a smaller force value reaches the upper limit of the measurement range, the upper beam of the first pulling frame contacts the corresponding limit block, and then the force value applied is measured by the next - level force sensor with a larger force value, thereby expanding the torque range of the torque measuring device. The measured values in different range segments are measured by high - precision force sensors in the corresponding range segments, ensuring the measurement accuracy. The force sensor module is arranged in a top - mounted manner above the knife bearing module, ensuring that the linear contact position of the force applied to the lever end remains constant, ensuring the stability of the lever arm value, and improving the accuracy of the torque standard value.

[0011] Further, it further includes a second pulling frame. The upper beam of the second pulling frame is pressed against the top surface of the support column on the upper surface of the lower seat of the first pulling frame through a spherical pressure head, and the lower seat of the second pulling frame is connected to the force - applying mechanism through a spherical joint connecting piece.

[0012] With the above - mentioned preferred solution, when a force - value device needs to be measured, the support column can be taken out and replaced with the device under test, enabling the machine to be used for multiple purposes. When calibrating a standard force sensor, the support column can be taken out and replaced with a standard force sensor of higher precision, which is convenient for in - situ calibration of the standard force sensor in the force sensor module.

[0013] Further, the elastic device includes an outer sleeve, a disc spring combination, and an inner guide post. There is a hole body on the upper beam that matches the outer sleeve. The outer sleeve can move axially up and down along the corresponding hole body of the upper beam. The upper end of the outer sleeve is open. The disc spring combination and the inner guide post are both located in the inner cavity of the outer sleeve and can move up and down. The lower end of the disc spring combination abuts against the bottom surface of the inner cavity of the outer sleeve, and the upper end of the disc spring combination abuts against the lower end surface of the inner guide post.

[0014] Further, the disc spring combination includes multiple groups of disc spring small units. The number of disc springs in each group of disc spring small units is the same. The disc springs in the same disc spring small unit face the same direction, and the directions of adjacent disc spring small units are opposite.

[0015] With the above - mentioned preferred solution, using disc springs as elastic devices facilitates the selection of appropriate elastic deformation coefficients and the height of the elastic device, and the axial movement position is relatively stable, ensuring the stability of the lever force - applying process.

[0016] Further, a core post extending to the inner hole of the disc spring is provided on the lower surface of the inner guide post on the side of the disc spring combination. There is a concave hole groove on the upper surface of the inner guide post, and a ball is provided in the hole groove. Each elastic device contacts the device above it through the apex of the ball; a spherical pressing head is installed on the bottom surface of the outer sleeve, and the outer sleeve contacts the top surface of the force sensor below it through the spherical surface of the spherical pressing head.

[0017] Further, a top - pressing bolt is connected by thread to the middle of the top surface of the upper beam of the first pulling frame, and the lower end surface of the top - pressing bolt abuts against the ball of the top - most elastic device.

[0018] With the above - mentioned preferred solution, it is ensured that the outer sleeve of the elastic device can move smoothly in the hole body of its corresponding upper beam, preventing the outer sleeve from getting stuck when the applied force has an axial offset.

[0019] Further, a plurality of through - holes distributed in a circular array are provided on the top surface of the upper beam of the first pulling frame. Threaded holes corresponding to the through - holes up and down are provided on the upper end surface of the outer sleeve of the top - most elastic device. A pull - rod screw is also included. The pull - rod screw passes through the through - hole and is connected to the threaded hole of the outer sleeve. When the outer sleeve moves down to a set distance, the head of the pull - rod screw abuts against the upper end surface of the through - hole of the upper beam.

[0020] Adopting the above - mentioned preferred solution facilitates the installation of the elastic device and prevents the elastic device from falling off during maintenance and debugging.

[0021] Furthermore, lifting guide columns are arranged inside the upper beam of the first pulling frame. 2*(n - 1) lifting plates are installed on the lifting guide columns in a lift - able and movable manner. Each lifting plate is correspondingly provided with a lifting drive mechanism for driving its up - and - down movement. An opening is provided at the middle position of each lifting plate. From top to bottom, guide sleeves are detachably and fixedly installed at the middle openings of the 1st, 3rd... (2n - 1)th lifting plates. The (n - 1)th elastic device is installed in the guide sleeve on the (2n - 1)th lifting plate and can move up and down along the axial direction of the guide sleeve. From top to bottom, stop rings are detachably and fixedly installed at the middle openings of the 2nd, 4th... (2n - 2)th lifting plates. A stop surface is provided on the lower surface of the stop ring. When the force value applied to the force sensor module by the force - applying mechanism through the first pulling frame is greater than or equal to the maximum set force value of the (n - 1)th force sensor, the limit stop block below the (n - 1)th force sensor is pressed against the stop surface of the stop ring on the (2n - 2)th lifting plate.

[0022] Adopting the above - mentioned preferred solution, the lifting plates with adjustable height positions are used to carry and install the guide sleeves and stop rings, which can facilitate the adjustment of the maximum measured value during the range switching of each force sensor, maximize the use of the high - precision force - measuring ranges of each force sensor, and thus improve the accuracy of torque measurement. At the same time, to adapt to elastic devices and force sensors of different sizes and models, only the appropriate guide sleeves and stop rings need to be replaced, without custom - manufacturing a special - sized upper beam, which improves the commonality of the first pulling frame and reduces the manufacturing cost.

[0023] Furthermore, a stop portion extending radially inward is provided at the lower port of the central hole of the guide sleeve. The inner diameter of the stop portion is smaller than the outer diameter of the outer sleeve of the corresponding elastic device, and the inner diameter of the stop portion is larger than the outer diameter of the upper part of the force sensor below it.

[0024] Adopting the above - mentioned preferred solution, it neither interferes with the upward movement of the outer sleeve of the elastic device when it is compressed, nor can it hold the outer sleeve after the pressure is released, facilitating installation and debugging.

[0025] Furthermore, an inner conical surface is provided at the lower port of the central hole of the stop ring, and an outer conical surface matching the inner conical surface of the stop ring is provided on the limit stop block.

[0026] Adopting the above - mentioned preferred solution, through the guiding cooperation between the inner conical surface of the stop ring and the outer conical surface of the limit stop block, the coaxiality of each force sensor in the force sensor module is improved. Description of the Drawings

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0028] Figure 1 It is a schematic structural diagram of an embodiment of the torque measurement device of the present invention.

[0029] Figure 2 It is a left view of an embodiment of the torque measurement device of the present invention.

[0030] Figure 3 Is Figure 2 A sectional view taken along the A-A direction in

[0031] Figure 4 It is a schematic structural diagram of an embodiment of the force sensor module.

[0032] Figure 5 It is a bottom view of an embodiment of the upper beam.

[0033] Figure 6 Is Figure 5 A sectional view taken along the B-B direction in

[0034] Figure 7 It is a schematic structural diagram of an embodiment of the elastic device.

[0035] Figure 8 It is a schematic structural diagram of an installation method of a force sensor module including two force sensors with different measurement ranges in the upper beam.

[0036] Figure 9 It is a schematic structural diagram of an installation method of a force sensor module including three force sensors with different measurement ranges in the upper beam.

[0037] Figure 10 Is Figure 9 A partial enlarged view at C in

[0038] Figure 11 It is a top view of an embodiment of the torque measurement device.

[0039] Figure 12 Is Figure 11 A sectional view taken along the D-D direction in

[0040] Figure 13 Is Figure 11 A sectional view taken along the E-E direction in

[0041] Figure 14It is a schematic structural diagram of the device under test for torque connected to the torque measuring device.

[0042] Figure 15 It is a schematic structural diagram of an embodiment of a rigid coupling.

[0043] Figure 16 It is a schematic structural diagram of an embodiment of a ball tooth coupling.

[0044] Names of the corresponding components represented by numbers and letters in the figure:

[0045] 10 - Base; 11 - Linear guide rail; 12 - Rack; 20 - Lever support seat; 30 - Lever; 31 - First rotary connecting shaft; 32 - Second rotary connecting shaft; 41 - First balance driving mechanism; 411 - First frame; 42 - Second balance driving mechanism; 421 - Second frame; 422 - Second reduction motor; 50 - First lever force application mechanism; 51 - Blade module; 510 - Blade block; 511 - V-shaped blade part; 52 - Knife bearing module; 520 - Knife bearing block; 521 - V-shaped knife bearing groove; 53 - Force sensor module; 531 - Force sensor; 532 - Elastic device; 5321 - Outer sleeve; 5322 - Disc spring combination; 5323 - Inner guide post; 5324 - Ball; 5325 - Spherical indenter; 5326 - Pressing bolt; 5327 - Pull rod nail; 533 - Limit stop block; 5331 - Outer conical surface; 54 - First pulling frame; 541 - Upper beam; 542 - Lower seat; 543 - Support column; 55 - Force application mechanism; 56 - Second pulling frame; 561 - Upper beam; 562 - Lower seat; 61 - Lifting guide post; 62 - Lifting plate; 63 - Lifting driving mechanism; 64 - Guide sleeve; 641 - Stop part; 65 - Stop ring; 651 - Stop surface; 652 - Inner conical surface; 70 - Second lever force application mechanism; 81 - First support unit; 811 - Support seat; 812 - Support platform; 8121 - T-shaped groove; 813 - Platform lifting driving mechanism; 8131 - Guide post; 8132 - Worm gear and worm elevator; 8133 - Double output shaft reduction motor; 814 - Third reduction motor; 82 - Second support unit; 91 - Rigid coupling; 911 - Metal coupling body; 912 - Coupling hole; 913 - First gap; 914 - Separation seam; 92 - Ball tooth coupling; 921 - First connecting shaft; 9211 - Ball head; 9212 - Outer arc teeth; 922 - Second connecting shaft; 9221 - Concave cavity; 9222 - Inner arc teeth. Specific embodiments

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0047] As Figures 1 - 13 shown, one implementation of the present invention is: a torque measurement device using multiple force sensors with different ranges for in-situ measurement, including:

[0048] A lever support base 20;

[0049] A lever 30, which is swingably mounted on the lever support base 20 through a linear fulcrum left and right;

[0050] A balance drive mechanism, which is located on the side of the lever 30 and is used to keep the lever in a horizontal balance state;

[0051] A lever force application mechanism, which is used to apply a force to the end of the lever 30; the lever force application mechanism includes a blade module 51, a knife bearing module 52, a force sensor module 53, a first bracket 54, and a force application mechanism 55; the blade module 51 is fixedly installed on the upper surface of the end of the lever 30, and the blade module 51 includes a blade block 510, and the upper part of the blade block 510 has a convex V-shaped blade portion 511; the knife bearing module 52 includes a knife bearing block 520, and the lower surface of the knife bearing block 520 has a concave V-shaped knife bearing groove 521. The knife bearing block 520 is pressed above the blade block 510, and the V-shaped blade portion 511 is in linear contact with the V-shaped knife bearing groove 521; the force sensor module 53 is installed above the knife bearing module 52. The upper beam 541 of the first bracket 54 is pressed above the force sensor module 53, and the force application mechanism 55 applies a downward pulling force to the lower seat 542 of the first bracket 54 through a connecting member; the force sensor module 53 includes n force sensors 531 with different ranges, n - 1 elastic devices 532, and n - 1 limit blocks 533, where n≥2. The first force sensor 531 to the nth force sensor 531 are distributed from top to bottom in sequence and the maximum range values increase in sequence. The nth force sensor 531 is installed on the upper surface of the knife bearing module 52. One elastic device 532 is installed above each of the first to n - 1 force sensors 531, and one limit block 533 is installed below each of the first to n - 1 force sensors 531. A stop surface 651 is provided on the upper beam 541 of the first bracket corresponding to the position of each limit block 533. When the force value applied to the force sensor module 53 by the force application mechanism 55 through the first bracket 54 is greater than or equal to the maximum set force value of the n - 1th force sensor 531, the limit block 533 below the n - 1th force sensor 531 is pressed against the corresponding stop surface 651 on the upper beam.

[0052] The beneficial effects of adopting the above technical solution are as follows: The lever force applying mechanism at the end of the lever is composed of a plurality of force sensors with different ranges and elastic devices connected in series in sequence. As the applied force value increases, the contraction amount of the elastic device under force gradually increases. When the force sensor with a smaller force value reaches the upper limit of its measurement range, the upper beam of the first pull frame contacts the corresponding limit stop block, and then the applied force value is measured by the next force sensor with a larger force value, thereby expanding the torque range of the torque measuring device. The measured values in different range segments are measured by high-precision force sensors in the corresponding range segments, ensuring the measurement accuracy. The force sensor module is arranged above the tool rest module in a top-mounted manner to ensure that the linear contact position of the force applied at the end of the lever remains constant, ensure the stability of the lever arm value, and improve the accuracy of the torque standard value.

[0053] As Figures 1 - 13 shown, in some other embodiments of the present invention, the torque measuring device further includes: a base 10;

[0054] a lever support seat 20, which is installed in the middle of the base 10;

[0055] a lever 30, which is installed on the lever support seat 20 so as to be swingable left and right through a linear fulcrum. A first rotary connection shaft 31 is fixedly installed on one side surface of the lever 30, and a second rotary connection shaft 32 is fixedly installed on the other side surface of the lever 30. The axes of the first rotary connection shaft 31 and the second rotary connection shaft 32 are both collinear with the linear fulcrum;

[0056] The balance drive mechanism includes a first balance drive mechanism 41 and a second balance drive mechanism 42; the first balance drive mechanism 41 is located on one side of the lever 30, and the output shaft of the first balance drive mechanism 41 is coaxially arranged with the first rotary connection shaft 31; the second balance drive mechanism 42 is located on the other side of the lever 30, and the output shaft of the second balance drive mechanism 42 is coaxially arranged with the second rotary connection shaft 32;

[0057] The lever force applying mechanism includes a first lever force applying mechanism 50 and a second lever force applying mechanism 70. The first lever force applying mechanism 50 applies a force to one end of the lever 30, and the second lever force applying mechanism 70 applies a force to the other end of the lever 30.

[0058] As Figure 2 、 Figure 3As shown, in some other embodiments of the present invention, it further includes a second tensioning bracket 56. The upper beam 561 of the second tensioning bracket 56 is pressed against the top surface of the support column 543 on the upper surface of the lower seat 542 of the first tensioning bracket 54 by a spherical indenter. The lower seat 562 of the second tensioning bracket 56 is connected to the force application mechanism 55 through a spherical joint connector. The beneficial effect of adopting the above technical solution is that when a force value device needs to be measured, the support column can be taken out and replaced with the force value device to be measured, achieving multi-functional use of one machine. When the standard force sensor needs to be calibrated, the support column can be taken out and replaced with a standard force sensor with higher accuracy, which is convenient for in-situ calibration of the standard force sensor in the force sensor module.

[0059] As Figure 7 , Figure 8 shown, in some other embodiments of the present invention, the elastic device 532 includes an outer sleeve 5321, a disc spring assembly 5322, and an inner guide post 5323. The upper beam is provided with a hole body matching the outer sleeve 5321. The outer sleeve 5321 can move axially up and down along the corresponding hole body of the upper beam. The upper end of the outer sleeve 5321 is open. The disc spring assembly 5322 and the inner guide post 5323 are both located in the inner cavity of the outer sleeve 5321 and can move up and down. The lower end of the disc spring assembly 5322 abuts against the bottom surface of the inner cavity of the outer sleeve 5321, and the upper end of the disc spring assembly 5322 abuts against the lower end surface of the inner guide post 5323. The disc spring assembly 5322 includes multiple groups of disc spring small units. The number of disc springs included in each group of the disc spring small units is the same. The disc springs in the same disc spring small unit face the same direction, and the directions of adjacent disc spring small units are opposite. The beneficial effect of adopting the above technical solution is that using disc springs as the elastic device is convenient for selecting a suitable elastic deformation coefficient and the height of the elastic device, and the axial movement position is relatively stable, ensuring the stability of the lever force application process.

[0060] As Figure 7 , Figure 8 shown, in some other embodiments of the present invention, the lower surface of the inner guide post 5323 is provided with a core column extending to the inner hole of the disc spring towards the disc spring assembly 5322. The upper surface of the inner guide post 5323 is provided with a concave hole groove, and a ball 5324 is arranged in the hole groove. Each elastic device 532 is in vertex contact with the device above it through the ball 5324; a spherical indenter 5325 is installed on the bottom surface of the outer sleeve 5321, and the outer sleeve 5321 is in contact with the top surface of the force sensor 531 below it through the spherical surface of the spherical indenter 5325. A top pressure bolt 5326 is threadedly connected to the middle of the top surface of the upper beam 541 of the first tensioning bracket 54, and the lower end surface of the top pressure bolt 5326 abuts against the ball 5324 of the uppermost elastic device 532. The beneficial effect of adopting the above technical solution is that it ensures that the outer sleeve of the elastic device can move smoothly in the hole body of its corresponding upper beam, preventing the outer sleeve from getting stuck when the force application occurs axial deviation.

[0061] As Figures 4 - 6 shown, in some other embodiments of the present invention, a plurality of through holes distributed in a circumferential array are provided on the top surface of the upper beam of the first tensioner 54. Threaded holes corresponding to the through holes are provided on the upper end surface of the outer sleeve 5321 of the uppermost elastic device 532. A pull rod nail 5327 is further included. The pull rod nail 5327 passes through the through hole and is connected to the threaded hole of the outer sleeve 5321. When the outer sleeve 5321 moves down to a set distance, the head of the pull rod nail 5327 abuts against the upper end surface of the through hole of the upper beam. The beneficial effect of adopting the above technical solution is: it is convenient for the installation of the elastic device and prevents the elastic device from falling off during maintenance and debugging.

[0062] As Figure 9 、 Figure 10 shown, in some other embodiments of the present invention, a lifting guide post 61 is provided in the upper beam 541 of the first tensioner 54. 2*(n - 1) lifting plates 62 are movably mounted on the lifting guide post 61 in a liftable manner. Each lifting plate 62 is correspondingly provided with a lifting drive mechanism for driving its up and down movement. An opening is provided at the middle position of each lifting plate 62; from top to bottom, a guide sleeve 64 is detachably and fixedly mounted at the middle opening of the 1st, 3rd... 2n - 1th lifting plates 62. The (n - 1)th elastic device 532 is installed in the guide sleeve 64 on the 2n - 1th lifting plate and can move up and down along the axial direction of the guide sleeve 64; from top to bottom, a stop ring 65 is detachably and fixedly mounted at the middle opening of the 2nd, 4th... 2n - 2th lifting plates 62. A stop surface 651 is provided on the lower surface of the stop ring 65. When the force value applied by the force application mechanism 55 to the force sensor module 53 through the first tensioner 54 is greater than or equal to the maximum set force value of the (n - 1)th force sensor 531, the limit stop block 533 below the (n - 1)th force sensor 531 is pressed against the stop surface 651 of the stop ring 65 on the 2n - 2th lifting plate. The beneficial effect of adopting the above technical solution is: the guide sleeve and the stop ring are carried and installed by the lifting plates with adjustable height positions, which can conveniently adjust the maximum measurement value during the range switching of each force sensor, facilitate the maximum utilization of the high-precision force measurement ranges of each force sensor, and thus improve the accuracy of torque measurement. At the same time, to adapt to elastic devices and force sensors of different sizes and models, only the appropriate guide sleeve and stop ring need to be replaced, without customizing and processing the upper beam with a special size structure, which improves the commonality of the first tensioner and reduces the manufacturing cost.

[0063] As Figure 10As shown in the figure, in some other embodiments of the present invention, a stop portion 641 extending radially inward is provided at the lower port of the central hole of the guide sleeve 64. The inner diameter of the inner edge of the stop portion 641 is smaller than the outer diameter of the outer sleeve 5321 of the corresponding elastic device, and the inner diameter of the inner edge of the stop portion 641 is larger than the outer diameter of the upper portion of the force sensor 531 below it. The beneficial effect of adopting the above technical solution is that it neither interferes with the upward movement of the outer sleeve when the elastic device is compressed, nor can it hold the outer sleeve after the pressure is released, which is convenient for installation and debugging.

[0064] As Figure 10 shown in the figure, in some other embodiments of the present invention, an inner conical surface 652 is provided at the lower port of the central hole of the stop ring 65, and an outer conical surface 5331 matching the inner conical surface of the stop ring is provided on the limit stop block 533. The beneficial effect of adopting the above technical solution is that the coaxiality of each force sensor in the force sensor module is improved through the guiding cooperation between the inner conical surface of the stop ring and the outer conical surface of the limit stop block.

[0065] As Figure 1 , Figure 11 , Figure 12 shown in the figure, in some other embodiments of the present invention, two parallel linear guide rails 11 and a rack 12 located between the two linear guide rails are respectively provided on the base 10 on both sides of the lever; a first frame 411 is slidably installed on the linear guide rail on one side of the lever, and the first balance driving mechanism 41 is fixedly installed on the first frame 411. A first reduction motor is also provided on the first frame 411, and a gear meshing with the rack 12 is installed on the output shaft of the first reduction motor; a second frame 421 is slidably installed on the linear guide rail on the other side of the lever, and the second balance driving mechanism 41 is fixedly installed on the second frame 421. A second reduction motor 422 is also provided on the second frame 421, and a gear meshing with the rack 12 is installed on the output shaft of the second reduction motor 422. The beneficial effect of adopting the above technical solution is that it is convenient to perform the axial translation of the balance driving mechanism to facilitate the installation of the device to be measured for torque.

[0066] As Figure 1 , Figure 11 , Figure 13As shown in the figure, in some other embodiments of the present invention, a first support unit 81 is also slidably mounted on the linear guide rail between the first frame 411 and the lever 30, and a second support unit 82 is also slidably mounted on the linear guide rail between the second frame 421 and the lever 30. Both the first support unit 81 and the second support unit 82 include a support base 811, a support platform 812, and a platform lifting drive mechanism 813. A third reduction motor 814 is provided on the support base 811, and a gear meshing with the rack 12 is mounted on the output shaft of the third reduction motor 814. The support platform 812 is vertically and slidably mounted on the support base 811 via a guide post 8131. Two worm gear lifts 8132 are also mounted on the support base 811 and are distributed left and right. The two worm gear lifts 8132 are respectively connected to the output shafts of a double-output shaft reduction motor 8133 via couplings. The double-output shaft reduction motor 8133 drives the worm gear lifts 8132 to drive the support platform 812 to move up and down. Multiple spaced T-shaped grooves 8121 are provided on the support platform 812. The beneficial effects of adopting the above technical solutions are as follows: The support unit can be translated along the linear guide rail, and the support platform can be adjusted in height, which is convenient for supporting devices such as torque wrenches during measurement. Auxiliary jigs can be installed on the support platform to facilitate the loading and unloading of torque devices during testing.

[0067] In some other embodiments of the present invention, the rated output torque of the second balance drive mechanism 42 is greater than the rated output torque of the first balance drive mechanism 41. The beneficial effects of adopting the above technical solutions are as follows: The appropriate balance drive mechanism can be selected according to the torque value range of the device to be measured, which can respond more accurately to small changes and improve sensitivity.

[0068] Due to the existence of errors in the mechanical processing and assembly processes, the axes of the lever rotation connection shaft and the output shaft of the balance drive mechanism cannot be completely coaxial. Conventionally, an elastic coupling is used to connect the device to be measured for torque, the balance drive mechanism, and the lever to compensate for the axis deviation and ensure the continuity and stability of torque transmission. However, when using the elastic coupling connection method, it sinks under the influence of the gravity of the device to be measured for torque, resulting in a large deviation between the axis of the device to be measured for torque and the axes of the lever rotation connection shaft and the output shaft of the balance drive mechanism, thereby affecting the torque detection accuracy. As Figures 14 - 16As shown in the figure, in some other embodiments of the present invention, among the two ends where the device under test for torque is connected to the balance drive mechanism and the lever, one end uses a rigid coupling 91 and the other end uses a ball tooth coupling 92. The rigid coupling 91 includes a metal coupling body 911 with an integral structure. A coupling hole 912 is provided through the center of the metal coupling body 911. A first slit 913 extending radially outward from the coupling hole is also provided on the metal coupling body 911. A circumferentially arranged dividing slit 914 is provided in the middle of the metal coupling body 911. The arc length of the dividing slit 914 is half a circumference. Locking bolts for locking after the rigid coupling is connected to the target shaft are provided at both ends of the dividing slit 914. The ball tooth coupling 92 includes a first connecting shaft 921 and a second connecting shaft 922. A ball head 9211 is provided at one end of the first connecting shaft 921. External arc teeth 9212 are provided on the ball head 9211. A coupling hole is provided at the other end of the first connecting shaft 921. A hemispherical cavity 9221 is provided at one end of the second connecting shaft 922. Internal arc teeth 9222 meshing with the external arc teeth 9212 are provided on the cavity wall of the cavity 9221. A coupling hole is provided at the other end of the second connecting shaft 922. The beneficial effects of adopting the above technical solution are as follows: By adopting the connection method of a rigid coupling at one end and a ball tooth coupling at the other end, the rigid coupling can ensure the coaxiality between the device under test for torque and the docking end, and the ball tooth coupling at the other end can compensate for the coaxiality deviation between the device under test for torque and the docking end, and compensate for the axis deviation between the axis of the lever rotary connection shaft and the output shaft of the balance drive mechanism. By combining the rigid coupling and the ball tooth coupling, the device under test for torque will not sink due to the influence of gravity, and the accuracy of torque detection is improved.

[0069] The above embodiments are only used to illustrate the technical concept and features of the present invention, and their purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it. However, the protection scope of the present invention cannot be limited by this. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered by the protection scope of the present invention.

Claims

1. A torque measuring device that uses multiple force sensors with different measuring ranges for in-situ measurement, characterized in that, Comprising: Lever support base; A lever, which is mounted on the lever support base through a linear fulcrum; A balance drive mechanism, which is located on the side of the lever and is used to keep the lever in a horizontal balance state; A lever force application mechanism, which is used to apply a force to the end of the lever; the lever force application mechanism includes a blade module, a knife bearing module, a force sensor module, a first bracket and a force application mechanism; the blade module is fixedly installed on the upper surface of the lever end, the blade module includes a blade block, and the upper part of the blade block has a convex V-shaped blade part; the knife bearing module includes a knife bearing block, and the lower surface of the knife bearing block has a concave V-shaped knife bearing groove. The knife bearing block is pressed against the upper part of the blade block, and the V-shaped blade part is in linear contact with the V-shaped knife bearing groove; the force sensor module is installed above the knife bearing module, the upper beam of the first bracket is pressed against the upper part of the force sensor module, and the force application mechanism applies a downward pulling force to the lower seat of the first bracket through a connecting piece; the force sensor module includes n force sensors with different ranges, n-1 elastic devices and n-1 limit blocks, where n≥2. The first force sensor to the nth force sensor are distributed from top to bottom in sequence and the maximum range values increase in sequence. The nth force sensor is installed on the upper surface of the knife bearing module. One elastic device is installed above each of the first to n-1th force sensors, and one limit block is installed below each of the first to n-1th force sensors. A stop surface is provided on the upper beam of the first bracket corresponding to the position of each limit block. When the force value applied to the force sensor module by the force application mechanism through the first bracket is greater than or equal to the maximum set force value of the n-1th force sensor, the limit block below the n-1th force sensor is pressed against the corresponding stop surface on the upper beam.

2. The torque measuring device for in-situ measurement using multiple force sensors with different ranges according to claim 1, characterized in that, It further includes a second bracket. The upper beam of the second bracket is pressed against the top surface of the support column on the upper surface of the lower seat of the first bracket through a spherical indenter, and the lower seat of the second bracket is connected to the force application mechanism through a spherical joint connecting piece.

3. The torque measuring device for in-situ measurement using multiple force sensors with different ranges according to claim 1, characterized in that The elastic device includes an outer sleeve, a disc spring combination and an inner guide column. A hole body matching the outer sleeve is provided on the upper beam. The outer sleeve can move axially up and down along the corresponding hole body of the upper beam. The upper end of the outer sleeve is open. The disc spring combination and the inner guide column are both located in the inner cavity of the outer sleeve and can move up and down. The lower end of the disc spring combination abuts against the inner cavity bottom surface of the outer sleeve, and the upper end of the disc spring combination abuts against the lower end surface of the inner guide column.

4. The torque measuring device for in-situ measurement using multiple force sensors with different measuring ranges according to claim 3, characterized in that The disc spring combination includes multiple groups of disc spring small units. The number of disc springs included in each group of disc spring small units is the same. The disc springs in the same disc spring small unit face the same direction, and the directions of adjacent disc spring small units are opposite.

5. The torque measuring device for in-situ measurement using a plurality of force sensors with different ranges according to claim 3, characterized in that The lower surface of the inner guide post is provided with a core post extending towards one side of the disc spring assembly to the inner hole of the disc spring. The upper surface of the inner guide post is provided with a concave hole groove, and a ball is arranged in the hole groove. Each elastic device is in contact with the device above it through the apex of the ball. The bottom surface of the outer sleeve is installed with a spherical pressure head, and the outer sleeve is in contact with the top surface of the force sensor below it through the spherical surface of the spherical pressure head.

6. The torque measuring device for in-situ measurement using multiple force sensors with different measuring ranges according to claim 5, characterized in that, A top pressure bolt is threadedly connected to the middle of the top surface of the upper beam of the first pulling frame, and the lower end surface of the top pressure bolt abuts against the ball of the uppermost elastic device.

7. The torque measuring device for in-situ measurement using multiple force sensors with different ranges according to claim 6, characterized in that, A plurality of through holes are arranged in a circumferential array on the top surface of the upper beam of the first pulling frame. Threaded holes corresponding to the through holes up and down are arranged on the upper end surface of the outer sleeve of the uppermost elastic device. A pull rod nail is further included. The pull rod nail passes through the through hole and is connected to the threaded hole of the outer sleeve. When the outer sleeve moves down to a set distance, the head of the pull rod nail abuts against the upper end surface of the through hole of the upper beam.

8. The torque measuring device for in-situ measurement using multiple force sensors with different ranges according to claim 3, characterized in that A lifting guide post is arranged in the upper beam of the first pulling frame. 2*(n - 1) lifting plates are installed on the lifting guide post in a liftable and movable manner. Each lifting plate is correspondingly provided with a lifting driving mechanism for driving its up and down movement. An opening is arranged at the middle position of each lifting plate. From top to bottom, a guide sleeve is detachably and fixedly installed at the middle opening of the 1st, 3rd... 2n - 1st lifting plates. The (n - 1)th elastic device is installed in the guide sleeve on the 2n - 1st lifting plate and can move up and down along the axial direction of the guide sleeve. From top to bottom, a stop ring is detachably and fixedly installed at the middle opening of the 2nd, 4th... 2n - 2nd lifting plates. A stop surface is arranged on the lower surface of the stop ring. When the force value applied by the force application mechanism to the force sensor module through the first pulling frame is greater than or equal to the maximum set force value of the (n - 1)th force sensor, the limit stop block below the (n - 1)th force sensor is pressed against the stop surface of the stop ring on the 2n - 2nd lifting plate.

9. The torque measuring device for in-situ measurement using multiple force sensors with different measuring ranges according to claim 8, characterized in that, The lower port of the central hole of the guide sleeve is provided with a stop portion extending radially inwards. The inner diameter of the inner edge of the stop portion is smaller than the outer diameter of the outer sleeve of the corresponding elastic device, and the inner diameter of the inner edge of the stop portion is larger than the outer diameter of the upper part of the force sensor below it.

10. The torque measuring device for in-situ measurement using multiple force sensors with different ranges as claimed in claim 8, characterized in that, The lower port of the central hole of the stop ring is provided with an inner conical surface, and the limit stop block is provided with an outer conical surface matching the inner conical surface of the stop ring.

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