Nut locking torque measuring device and measuring method

Abstract

The invention discloses a nut locking torque measuring device and method, and the device comprises a bottom plate, a torque measuring assembly, a clamping assembly, a one-way locking assembly and a driving assembly, the top of the torque measuring assembly is provided with a measuring end, the measuring end is detachably connected with a mounting part, and the clamping assembly comprises a mounting seat. Two clamping parts which are oppositely arranged are movably connected to the mounting seat, clamping surfaces are arranged on the two clamping parts, limiting blocks are arranged on the two clamping surfaces, the two sets of one-way locking assemblies are arranged on the mounting seat and used for locking the two clamping parts respectively, and the driving assembly is movably connected with the mounting seat. A first elastic piece is arranged between the driving assembly and the mounting base, and the driving assembly is used for driving the mounting base to move in the vertical direction and driving the mounting base to rotate. The torque wrench aims at solving the technical problems that a torque wrench is narrow in application range, high in cost and inconvenient to align and operate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of torque measurement, and particularly relates to a nut locking torque measuring device and a measuring method. BACKGROUND

[0002] The core goal of nut locking torque measurement is to indirectly verify whether the axial pretightening force of the bolt connection meets the design requirements through the torque parameter, so as to guarantee the mechanical properties and operation reliability of the connection structure. At present, torque wrenches are generally used as the main measuring tools in the industrial field, but there are the following defects in their application: ① The torque wrench needs to be specially matched according to the bolt specification, and each type of wrench is only suitable for a specific size range. For example, M12 bolts need to be equipped with corresponding torque wrenches. If M10 and M16 bolts need to be measured, two sets of equipment need to be additionally configured. This "one type, one set" feature results in a narrow application range of the torque wrench and high cost.

[0003] ② The traditional torque wrench adopts a manual positioning method, and the wrench needs to be adjusted to make the driving square hole completely match the nut hexagon during operation, which is inconvenient to operate. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application aims to provide a nut locking torque measuring device and a measuring method to solve the technical problems of narrow application range, high cost and inconvenient alignment of the torque wrench.

[0005] One of the present application To achieve the foregoing application purpose, the technical scheme adopted by the present application comprises: a nut locking torque measuring device, comprising: a bottom plate arranged horizontally; a torque measuring assembly, which is installed on the bottom plate, and has a measuring end at the top, and the measuring end is detachably connected with an installation part for welding with a vertically arranged bolt; a clamping assembly, which comprises a mounting seat, two oppositely arranged clamping parts are movably connected to the mounting seat, both of the two clamping parts have clamping surfaces parallel to the bolt axis, the two clamping surfaces are oppositely arranged and are respectively used for clamping any two opposite surfaces of the nut, and a limiting block is arranged on each of the two clamping surfaces; The one-way locking assembly is two groups, both of which are arranged on the mounting seat and are used for locking two clamping parts respectively, when the two clamping parts are subjected to downward force, the nut exerts a counterforce on the clamping parts through the limiting block to make the two clamping parts approach each other, the one-way locking assembly does not limit the movement of the clamping parts in the process, after the force on the clamping parts is removed, the clamping parts move downward under the action of gravity and separate from the one-way locking assembly, and then the two clamping parts separate from each other; The driving assembly is movably connected with the mounting seat, and the first elastic member is arranged between the driving assembly and the mounting seat, and the driving assembly is used for driving the mounting seat to move in the vertical direction and rotate.

[0006] Compared with the prior art, the advantages of the present application include: (1) The nut locking torque measuring device provided by the present application drives the mounting seat to move downward through the driving assembly, after the limiting block abuts against the top of the nut, the first elastic member is elastically stressed, and the elastic force is applied to the two clamping parts through the limiting block, so that the two clamping parts approach each other, and the two clamping surfaces abut against the opposite sides of the nut respectively to realize clamping. By such arrangement, even different models of nuts can be effectively clamped, the application range is wider, and compared with a torque wrench, one measuring device can realize torque measurement of multiple nuts, and the cost is lower.

[0007] (2) The nut locking torque measuring device provided by the present application, when the clamping surface abuts against the edge between the two side surfaces of the nut, the clamping surface can be parallel to the opposite surfaces of the nut through the subsequent rotation of the clamping part, and when parallel, the two clamping parts continue to be driven to approach each other under the action of the elastic force of the first elastic member to form clamping. Therefore, even if the clamping surface is not aligned with the side surface of the nut before rotation, automatic adjustment can be realized in the subsequent rotation process, the process of manual alignment is reduced, and the operation is more convenient.

[0008] (3) The nut locking torque measuring device provided by the present application, during the tightening process, the limiting block is finally in contact with the nut through the first elastic member, so that the relative position between the nut and the clamping part does not change after the nut moves upward, the nut and the clamping part are separated, and the failure of loosening the nut is caused.

[0009] (4) The nut locking torque measuring device provided by the present application, when the two clamping parts are subjected to the elastic force of the first elastic member, the nut exerts a counterforce on the clamping parts through the limiting block to make the two clamping parts approach each other, at this time, the one-way locking assembly is in a "positive unlocking" state, allowing the clamping parts to freely approach each other without limiting their movement, and the one-way locking assembly will prevent the two clamping parts from moving away from each other, so that the clamping parts maintain a stable clamping state during clamping; In addition, when the two clamping portions are not affected by the elastic force of the first elastic member (i.e. in the initial state), the two clamping portions continue to separate from each other after being separated from the one-way locking assembly under the action of gravity, so as to realize automatic resetting of the clamping portions, thereby facilitating the clamping work in the next time.

[0010] Further, the side wall of the clamping portion has a first mounting surface perpendicular to the clamping surface, a first sliding groove is formed on the first mounting surface, the first sliding groove is arranged to be inclined upward near one end of the bolt, a first sliding block is arranged in the first sliding groove, the width of the first sliding block is smaller than the width of the first sliding groove, and the first sliding block is fixedly connected with the mounting seat.

[0011] Further, the one-way locking assembly comprises a first tooth plate and a second tooth plate, the first tooth plate is arranged on the top of the clamping portion, the second tooth plate is arranged above the first tooth plate and is slidably connected with the mounting seat in the vertical direction, and the first tooth plate and the second tooth plate are arranged with first locking teeth and second locking teeth which are locked with each other on one side. A second elastic member is arranged between the second tooth plate and the mounting seat.

[0012] Further, the limiting block is arranged on the clamping portion in the direction perpendicular to the clamping surface, a third elastic member is arranged between the limiting block and the clamping portion, and the limiting portion is arranged as an outwardly recessed arc surface on the side away from the clamping surface.

[0013] Further, the driving assembly comprises a mounting bracket arranged vertically on the bottom plate, a sliding frame is arranged on the mounting bracket, the sliding frame can slide on the mounting bracket in the vertical direction, a motor is arranged on the sliding frame, an output shaft of the motor extends downward and is inserted into the mounting seat, and the first elastic member is arranged between the output shaft of the motor and the mounting seat. A hydraulic push rod is arranged on the mounting bracket, and the extension end of the hydraulic push rod is connected with the sliding frame.

[0014] Further, a blowing assembly is arranged on the bottom plate, the blowing assembly comprises a gas storage tank, a movable plate and a connecting rod, the gas storage tank is fixed on the bottom plate, the gas storage tank is arranged below the sliding frame, the movable plate is arranged in the gas storage tank, the movable plate is slidably and sealingly connected with the gas storage tank in the vertical direction, the connecting rod is arranged between the sliding frame and the movable plate, one end of the connecting rod is connected with the movable plate, and the other end of the connecting rod extends upward, penetrates through the gas storage tank and is connected with the sliding frame. An air inlet and an air outlet are respectively formed in the lower part of the gas storage tank, the air inlet and the air outlet are communicated with the inside of the gas storage tank, an air inlet pipe and an air outlet pipe are arranged outside the gas storage tank, the air inlet pipe and the air outlet pipe are communicated with the inside of the gas storage tank through the air inlet and the air outlet respectively, and an air inlet one-way valve and an air outlet one-way valve are respectively arranged on the air inlet pipe and the air outlet pipe. The wedge is located below the movable plate, the wedge has an inclined surface, a first through hole is formed through the wedge, a push rod is arranged at the bottom of the movable plate, and the movable plate can slide the wedge by the push rod and the inclined surface during downward movement to make the first through hole communicate with the gas outlet, and a fourth elastic member is arranged between the wedge and the gas storage tank for resetting the wedge after sliding; The bottom plate is fixed with a one-end-opened nozzle, the nozzle is provided with a spray head, and the open end of the nozzle communicates with the gas outlet pipe.

[0015] Further, a self-rotation assembly is arranged between the nozzle and the gas outlet pipe, the self-rotation assembly comprises a horizontally arranged annular block, the annular block is fixed on the bottom plate and surrounds the torque measurement assembly, a first annular groove is formed at the top of the annular block and extends along the circumferential direction of the annular block, a second through hole is formed in the outer side wall of the annular block and communicates with the first annular groove, and the second through hole communicates with the gas outlet pipe. An annular self-rotation block is arranged in the first annular groove, the self-rotation block is rotationally and sealingly connected with the first annular groove, a second annular groove is formed in the side wall of the self-rotation block and extends along the circumferential direction of the self-rotation block, a plurality of blades are arranged in the second annular groove, the plurality of blades are uniformly arranged along the circumferential direction of the second annular groove, the nozzle is arranged at the top of the self-rotation block, the open end of the nozzle communicates with the inside of the second annular groove, and the self-rotation block can be rotated by the blades when the gas outlet pipe delivers gas into the first annular groove.

[0016] The second aspect of the application: A nut locking torque measurement method comprises the following steps: Step one, the nut is sleeved on the top of the bolt; Step two, start the hydraulic push rod, the hydraulic push rod drives the sliding frame to move downward, thereby driving the mounting seat to move downward until the limiting block abuts against the top of the nut, after the limiting block abuts against the top of the nut, the hydraulic push rod continues to drive the sliding frame to move downward, at this time, the first spring will be elastically deformed due to stress, the first rod body penetrates into the inside of the second rod body, and the downward elastic force of the first spring is applied to the two clamping parts through the limiting block to make the two clamping parts close to each other. Step three, starting the motor drives the first rod body to rotate, the first rod body drives the second rod body to rotate, the second rod body drives the mounting seat to rotate, and then the clamping part drives the nut to rotate, the rotation of the nut makes the nut move downward along the bolt, and the tightening operation of the nut is completed, and the torque measurement assembly completes torque measurement in this process. Step four, after the nut is tightened, the motor is started to make the motor reverse, the motor drives the first rod body to reverse rotation, the nut moves upward along the bolt, and the nut returns to the original state. Step 5: The hydraulic push rod performs a return motion, pulling the sliding frame upward to restore the sliding frame to its original state. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the structure of an embodiment of the present invention Figure 1 ; Figure 2 A schematic diagram of the structure of an embodiment of the present invention Figure 2 ; Figure 3 A schematic diagram of the structure of an embodiment of the present invention Figure 3 ; Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure Figure 1 ; Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure Figure 2 .

[0019] Reference numerals: Base plate 1, torque measuring assembly 2, nut 3, bolt 4, mounting seat 5, clamping portion 6, clamping surface 7, limit block 8, first elastic member 9, first mounting surface 10, first slide groove 11, first slider 12, first tooth plate 13, second tooth plate 14, second elastic member 15, second mounting surface 16, second slide groove 17, second slider 18, third elastic member 19, arcuate surface 20, mounting bracket 21, sliding frame 22, motor 23, first rod 24, second rod 25, hydraulic push rod 26, air storage box 27, movable plate 28, connecting rod 29, air inlet pipe 30, air outlet pipe 31, air inlet check valve 32, air outlet check valve 33, wedge block 34, inclined surface 35, first through hole 36, push rod 37, fourth elastic member 38, nozzle 39, nozzle 40, annular block 41, rotating block 42, blade 43. DETAILED DESCRIPTION

[0020] In view of the deficiencies in the prior art, the inventors of this case have proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principles, etc. in conjunction with the drawings in the embodiments of this application and specific implementation cases.

[0021] It should be noted that the embodiments described below by reference to the drawings are exemplary only, are intended to explain the present application, and are not understood as limiting the present application, and the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, the present application covers any alternative, modification, equivalent method and scheme within the spirit, principle and scope of the present application defined by the claims, and all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0022] In the description of the present application, the terms "first", "second", "third" and the like do not indicate any order, number or importance, but are only used to distinguish different components. Similarly, the terms "one" or "a" and the like do not indicate a quantity limitation, but indicate the existence of at least one. The terms "including" or "containing" and the like mean that the elements or objects appearing before "including" or "containing" cover the elements or objects listed after "including" or "containing" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0023] In the description of the present application, the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, when using two sides, outer sides, upper and lower position terms, it should be understood that they are only used for easy understanding and description, considering that the structure can be oriented to other positions.

[0024] In the description of the present application, unless otherwise explicitly specified and limited, the technical terms or scientific terms used should be understood as the usual meaning understood by those skilled in the art in the field to which the present application belongs, and the terms "mounting", "connection", "connection" and the like should be broadly understood, for example, it can be fixed connection, it can also be detachable connection, it can also be abutting connection or integral connection; for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] One of the present application: Please refer to Figures 1-5 The present application provides a technical solution: a nut 3 locking torque measuring device, comprising a bottom plate 1, a torque measuring assembly 2, a clamping assembly, a one-way locking assembly and a driving assembly.

[0026] Referring to Figures 1-2 The base plate 1 is horizontally arranged and serves as a base support platform of the whole device, providing a stable mounting reference.

[0027] The torque measurement assembly 2 directly measures the torque generated during the locking of the nut 3 and is a core measurement unit. The torque measurement assembly 2 is mounted on the base plate 1 and has a measurement end at the top. The measurement end is detachably connected with a mounting portion for welding with the vertically arranged bolt 4. Specifically, the torque measurement assembly 2 mainly includes a static torque sensor and a torque digital display instrument. The static torque sensor can be a torque sensor of ZNNT type from Zhongnuo. The static torque sensor is fixedly installed on the base plate 1 along the vertical direction, and the measurement end is located above the static torque sensor. The measurement end is detachably connected with the mounting portion through the fixed bolt 4. The bolt 4 is sleeved with the nut 3, and the static torque sensor and the torque digital display instrument are electrically connected. By driving the nut 3 to rotate, the bolt 4 generates a reverse torque due to being fixed on the mounting portion. The torque is transmitted to the static torque sensor through the mounting portion, and the value is displayed on the torque digital display instrument and processed to obtain a torque value-time curve. The locking torque of the nut 3 can be obtained by observing the curve.

[0028] Referring to Figures 3-4 The clamping assembly includes a mounting seat 5 serving as a carrier and movably connecting two opposite clamping portions 6 to allow the clamping portions 6 to move towards or away from each other. Each of the two clamping portions 6 has a clamping surface 7 parallel to the axis of the bolt 4. The two clamping surfaces 7 are oppositely arranged and are respectively used for clamping any two opposite surfaces of the nut 3. Each of the two clamping surfaces 7 is provided with a limiting block 8 perpendicular to the clamping surface 7. The limiting block 8 is used for abutting against the upper end of the nut 3 to limit the nut 3.

[0029] The one-way locking assembly is provided on the mounting seat 5 and is used for locking the two clamping portions 6. When the two clamping portions 6 are subjected to a downward force, the nut 3 exerts a reaction force on the clamping portions 6 through the limiting block 8 to make the two clamping portions 6 approach each other. At this time, the one-way locking assembly is in a “positive unlocking” state, allowing the clamping portions 6 to freely approach each other without limiting their movement. After the force on the clamping portions 6 is removed, the clamping portions 6 move downward under the influence of gravity and separate from the one-way locking assembly, and the two clamping portions 6 move away from each other. It should be noted that under the action of the one-way locking assembly, the two clamping portions 6 cannot move away from each other without removing the force applied to the clamping portions 6.

[0030] The driving assembly is movably connected with the mounting seat 5, and the first elastic member 9 is arranged between the driving assembly and the mounting seat 5. The driving assembly is used to drive the mounting seat 5 to move in the vertical direction and drive the mounting seat 5 to rotate. The driving assembly drives the mounting seat 5 to move downward to move the two clamping portions 6 downward, and the clamping portions 6 press the upper end of the nut 3 through the limiting blocks 8, so that the clamping portions 6 can be tightly attached to the nut 3. After the limiting blocks 8 abut against the nut 3, the driving assembly continues to drive the mounting seat 5 to move downward to elastically compress the first elastic member 9, and then the first elastic member 9 applies a downward force to the clamping portions 6. The downward force makes the limiting blocks 8 tightly attach to the nut 3, so that the relative position of the nut 3 and the clamping portions 6 does not change after the nut 3 moves on the bolt 4, and the nut 3 is not separated from the clamping portions 6, which causes the nut 3 to fail to be loosened. In addition, the first elastic member 9 applies a downward force to the two clamping portions 6, and the limiting blocks 8 apply a counterforce to the clamping portions 6 to make the two clamping portions 6 close to each other to achieve clamping. The driving assembly drives the mounting seat 5 to rotate, drives the nut 3 to rotate, and the bolt 4 generates a reverse torque due to fixation. The torque measuring assembly 2 measures and outputs the locking torque value in real time.

[0031] In use, the operation steps are as follows: First, the nut 3 is sleeved on the top of the bolt 4. Then, the driving assembly is started, and the driving assembly drives the mounting seat 5 to move downward until the limiting blocks 8 abut against the top of the nut 3. After the limiting blocks 8 abut against the top of the nut 3, the driving assembly continues to drive the mounting seat 5 to move downward, and at this time, the first elastic member 9 is elastically deformed due to the force, the first elastic member 9 generates a downward elastic force and acts on the two clamping portions 6, and the limiting blocks 8 apply a counterforce to the clamping portions 6. Under the joint action of the two forces, the two clamping portions 6 close to each other, thereby achieving clamping of the nut 3. In this process, the one-way locking assembly is in a “forward unlocking” state, which allows the clamping portions 6 to freely close to each other and does not limit the movement of the clamping portions 6; at the same time, the one-way locking assembly prevents the two clamping portions 6 from moving away from each other, thereby maintaining the clamping state of the two clamping portions 6 on the nut 3. After the nut 3 is clamped, the driving assembly drives the mounting seat 5 to rotate. Since the two clamping portions 6 are connected with the mounting seat 5, the two clamping portions 6 are driven to rotate together, thereby driving the nut 3 to rotate and move along the bolt 4 to the mounting portion until the nut 3 abuts against the mounting portion, and the tightening operation of the nut 3 is completed. In the process of tightening the nut 3, the torque measuring assembly 2 measures the torque value in real time. After the measurement is completed, the driving assembly drives the mounting seat 5 to rotate in the reverse direction, the nut 3 is loosened, and the nut 3 returns to the initial position on the top of the bolt 4. Finally, the driving assembly drives the mounting seat 5 to move upward to separate the nut 3 from the limiting blocks 8, and the first elastic member 9 returns to the free state, and the two clamping portions 6 are separated from each other under the action of gravity.

[0032] In the specific implementation of the above scheme: ①, through the drive assembly drive mounting seat 5 down, in the limit block 8 abut on the top of the nut 3 after, the first elastic element 9 elastic force, and the elastic force through the limit block 8 acts on two clamping part 6, so that two clamping part 6 to each other, two clamping surface 7 respectively in the nut 3 relative to both sides of the resistance, realize clamping, so set, even for different models of nut 3 can be effectively clamped, more widely.

[0033] ②, in the clamping surface 7 abut on the edge between the nut 3 two side surface, when the subsequent clamping part 6 can make the clamping surface 7 and the nut 3 relative to both sides of the parallel, parallel, under the action of the elastic force of the first elastic element 9 continue to drive two clamping part 6 to each other, form clamping, thus even before the rotation of the clamping surface 7 is not aligned with the nut 3 side surface, in the subsequent rotation process can also realize automatic adjustment, reduces the process of artificial alignment, operation is more convenient.

[0034] ③, in the process of tightening, through the first elastic element 9 makes the limit block 8 finally with the nut 3, not to the nut 3 after moving up, with the clamping part 6 relative position change, so that the nut 3 and clamping part 6 separate, and cause the nut 3 loose failure.

[0035] ④, when two clamping part 6 by the elastic force of the first elastic element 9, the nut 3 through the limit block 8 on the clamping part 6 to make two clamping part 6 to each other, at this time the one-way locking assembly is in the "positive unlocking" state, allows the clamping part 6 free to each other, not limit its movement, two clamping part 6 back to the movement of the one-way locking assembly will be prevented, so that the clamping part 6 in clamping to maintain a stable clamping state; In addition, when two clamping part 6 not by the elastic force of the first elastic element 9 (i.e. initial state), the clamping part 6 under the influence of gravity down movement and one-way locking assembly after separation, two clamping part 6 continue to separate each other, realize the automatic reset of the clamping part 6, in order to carry on the next clamping work.

[0036] Reference Figures 3-4 , in this embodiment: the clamping part 6 side wall has a first mounting surface 10 perpendicular to the clamping surface 7, the first mounting surface 10 is provided with a first sliding groove 11, the first sliding groove 11 is inclined to the upper end of the bolt 4, the first sliding groove 11 is provided with a first sliding block 12, the width of the first sliding block 12 is less than the width of the first sliding groove 11, the first sliding block 12 is fixedly connected with the mounting seat 5.

[0037] When the first elastic member 9 exerts a force on the mounting base 5 and the limiting block 8 abuts against the top of the nut 3, the first sliding block 12 abuts against the lower side of the first sliding groove 11 under the elastic force of the first elastic member 9, and the inclined arrangement of the first sliding groove 11 enables the first sliding block 12 to slide relatively downward along the lower side of the first sliding groove 11, thereby enabling the two clamping portions 6 to move relatively. When the mounting base 5 is not subjected to the force of the first elastic member 9 and the limiting block 8 is separated from the nut 3, the clamping portions 6 move downward under the action of gravity, and the first sliding block 12 abuts against the upper side of the first sliding groove 11, and the clamping portions 6 are separated from the one-way locking assembly during the downward movement of the clamping portions 6, so that the one-way locking assembly does not act on the clamping portions 6, and then the first sliding block 12 moves relatively upward along the upper side of the first sliding groove 11 under the gravity of the clamping portions 6, thereby enabling the two clamping portions 6 to move away from each other.

[0038] Specifically, the clamping portions 6 are provided with first mounting surfaces 10 on both sides, the two first mounting surfaces 10 are arranged oppositely, a clamping plate is attached to the first mounting surfaces 10, the clamping plate is fixedly connected to the mounting base 5, and the first sliding block 12 is fixed to the clamping plate.

[0039] Referring to Figures 3-4 In the embodiment, the one-way locking assembly includes a first toothed plate 13 and a second toothed plate 14, the first toothed plate 13 is arranged on the top of the clamping portion 6, the second toothed plate 14 is located above the first toothed plate 13 and is slidably connected to the mounting base 5 in the vertical direction, and the first toothed plate 13 and the second toothed plate 14 are provided with first locking teeth and second locking teeth that are locked to each other on opposite sides. It should be noted that the first locking teeth and the second locking teeth are not locked during the relative movement of the clamping portions 6, but are locked to each other to maintain the clamping state of the clamping portions 6 on the nut 3 during the movement away from each other of the two clamping portions 6. Under the locking action of the one-way locking assembly on the clamping portions 6 and the action of the first sliding block 12 on the clamping portions 6 during the rotation of the clamping portions 6, the clamping portions 6 can rotate in a relatively stable manner and are not easy to move relative to the mounting base 5.

[0040] A second elastic member 15 is arranged between the second toothed plate 14 and the mounting base 5, and the first toothed plate 13 and the second toothed plate 14 can always be kept in contact during the movement of the two clamping portions 6 towards each other by the second elastic member 15. It should be noted that when the first sliding block 12 abuts against the uppermost side of the groove, i.e., when the two clamping portions 6 are at the maximum opening degree, the first toothed plate 13 and the second toothed plate 14 are not in contact, and the position of the second toothed plate 14 on the mounting base 5 remains relatively stable under the connecting action of the second elastic member 15.

[0041] Specifically, the mounting base 5 has a second mounting surface 16 parallel to the clamping surface 7, the second mounting surface 16 is provided with a second sliding groove 17, the second sliding groove 17 extends in the vertical direction, the second sliding groove 17 is provided with a second sliding block 18, the second sliding block 18 is clamped in the second sliding groove 17 and can slide in the vertical direction in the second sliding groove 17, the second sliding block 18 is fixedly connected with the second toothed plate 14, and the second elastic element 15 is arranged between the second sliding block 18 and the mounting base 5. The second elastic element 15 is a second spring, the second spring is located in the second sliding groove 17 and above the second sliding block 18, one end of the second spring is fixedly connected with the second sliding block 18, and the other end extends upward and is fixedly connected with the mounting base 5.

[0042] Referring to Figure 4 In the embodiment, the limiting blocks 8 are arranged in the clamping part 6 and slide in the direction perpendicular to the clamping surface 7, the third elastic elements 19 are arranged between the limiting blocks 8 and the clamping part 6, and the limiting part is provided with an outwardly recessed arc surface 20 away from the clamping surface 7. Through the above arrangement, the length of the limiting block 8 can be changed according to the size of the bolt 4, so that the limiting block 8 can adapt to a larger range of nut 3 sizes. When the third elastic elements 19 are in a natural state, the two limiting blocks 8 can respectively extend towards each other under the elastic force of the two third elastic elements 19, so as to shorten the distance between the two limiting blocks 8, thereby enabling the limiting block 8 to abut against the nut 3 when facing a smaller nut 3 and bolt 4 size, so that the subsequent clamping and rotating work can be smoothly completed. Even if the distance between the two limiting blocks 8 is smaller than the width size of the nut 3, the limiting block 8 can be squeezed under the action of the arc surface 20, so that the two limiting blocks 8 move away from each other, and then the arc surface 20 of the limiting block 8 abuts against the side wall of the bolt 4 and can slide up and down along the side wall of the bolt 4. On this basis, applying a downward force to the limiting block 8 can enable the limiting block 8 to abut against the nut 3. It should be noted that the thickness of the limiting block 8 should be much greater than the thread pitch of the bolt 4, so as to avoid the limiting block 8 being stuck in the thread of the nut 3 and reduce the possibility of forming a jam.

[0043] Specifically, the clamping surface 7 is provided with a sliding hole extending in the direction perpendicular to the clamping surface 7, the end of the limiting block 8 away from the bolt 4 is located in the sliding hole and can slide along the length direction of the sliding hole, the third elastic element 19 is a third spring, the third spring is located in the sliding hole, one end of the third spring is fixedly connected with the bottom wall of the sliding hole, and the other end is fixedly connected with the limiting block 8.

[0044] Referring to Figure 1In the embodiment, the driving assembly comprises a mounting bracket 21 vertically arranged on the bottom plate 1, and a sliding frame 22 arranged on the mounting bracket 21 and capable of sliding on the mounting bracket 21 in the vertical direction. Specifically, the mounting bracket 21 is provided with a vertical sliding rail, and a sliding block is slidingly arranged on the sliding rail and fixedly connected with the sliding frame 22 by a bolt 4. The sliding frame 22 is provided with a motor 23, which is specifically a servo motor capable of adjusting the output torque, the rotating speed and the rotating direction. The output shaft of the motor 23 extends downward and is inserted into the mounting base 5. Specifically, the output shaft of the motor 23 is fixedly connected with a first rod body 24, the first rod body 24 is externally inserted with a second rod body 25, the second rod body 25 is fixedly connected with the mounting base 5 at an end away from the first rod body 24, and the cross sections of the first rod body 24 and the second rod body 25 are both rectangular. A first elastic member 9 is arranged between the output shaft of the motor 23 and the mounting base 5, and is specifically a first spring sleeved on the second rod body 25. One end of the first spring is fixedly connected with the output shaft of the motor 23, and the other end is fixedly connected with the mounting base 5.

[0045] In addition, it should be noted that the compression degree of the first elastic member 9 should be slightly greater than the length of the bolt 4, so that the first elastic member 9 still has elastic force when the nut 3 is tightened, so that the limiting block 8 can tightly abut against the nut 3, the clamping portion 6 can smoothly rotate the nut 3 to loosen, and when the nut 3 is tightened, the elastic force of the first elastic member 9 applied to the nut 3 can be ignored, so that the elastic force of the first elastic member 9 does not have too much influence on the friction between the nut 3 and the bolt 4, which helps to improve the measurement accuracy of the locking torque of the nut 3. In addition, the elastic force of the first elastic member 9 compressed to the maximum degree is appropriate to drive the two clamping portions 6 to approach each other.

[0046] The mounting bracket 21 is provided with a hydraulic push rod 26, and the extension end of the hydraulic push rod 26 is fixedly connected with the sliding frame 22. The hydraulic push rod 26 is used to push the sliding frame 22 to move up and down.

[0047] When in use, the hydraulic push rod 26 drives the sliding frame 22 to move downward, thus driving the mounting base 5 to move downward until the limiting block 8 abuts against the top of the nut 3. After the limiting block 8 abuts against the top of the nut 3, the hydraulic push rod 26 continues to drive the sliding frame 22 to move downward, at this time, the first spring will be elastically deformed due to the force, the first rod body 24 penetrates into the second rod body 25, and the first spring generates downward elastic force which is applied to the two clamping portions 6 through the limiting block 8. Then the motor 23 drives the first rod body 24 to rotate, the first rod body 24 drives the second rod body 25 to rotate, the second rod body 25 drives the mounting base 5 to rotate, and then drives the nut 3 to rotate through the clamping portions 6, the rotation of the nut 3 drives the nut 3 to move downward along the bolt 4, under the elastic force of the first spring, the clamping portions 6 always keep in contact with the nut 3, after the nut 3 is tightened, the motor 23 drives the first rod body 24 to rotate reversely, the nut 3 moves upward along the bolt 4. After the nut 3 returns to the original state, the hydraulic push rod 26 pulls the sliding frame 22 to move upward, so as to return the sliding frame 22 to the original state.

[0048] It should be noted that the motor 23 has a preset torque value, the torque value should be greater than the locking torque of the nut 3 so as to lock the nut 3. According to the tightening process of the nut 3, a torque-time change relationship diagram can be obtained, the nut 3 receives a greater torque at the beginning of the locking process because the elastic force of the first elastic member 9 is greater (the friction is greater), the torque of the nut 3 gradually decreases subsequently because the elastic force of the first elastic member 9 is released, when the nut 3 tends to be tightened, the friction between the nut 3 and the bolt 4 increases, the torque value increases, and at this time, the increasing speed of the torque should be greater than the decreasing speed of the torque before, when the nut 3 is tightened, because the torque value of the motor 23 is greater than the locking torque of the nut 3, the torque detected by the torque detection assembly will rise to a peak value in a short time, and then maintain a stable torque state. It should be understood that the increasing speed of the measured torque after tightening should be greater than the speed when the nut 3 is about to be tightened but not tightened. Finally, the locking torque of the nut 3 can be obtained by observing the inflection point of the two lines, and then the locking torque of the nut 3 can be obtained by conversion through the existing formula.

[0049] Referring to Figure 1 and 5In the embodiment, the bottom plate 1 is provided with a blowing assembly, which comprises a gas storage tank 27, a movable plate 28 and a connecting rod 29. The gas storage tank 27 is fixed on the bottom plate 1 and located below the sliding frame 22. The movable plate 28 is located inside the gas storage tank 27 and is in sliding seal connection with the gas storage tank 27 in the vertical direction. The movable plate 28 and the gas storage tank 27 form a structure similar to a cylinder piston. The gas pressure state inside the gas storage tank 27 can be changed by the up-and-down sliding movement of the movable plate 28 in the gas storage tank 27. The connecting rod 29 is arranged between the sliding frame 22 and the movable plate 28. One end of the connecting rod 29 is fixedly connected with the movable plate 28, and the other end extends upward, penetrates through the gas storage tank 27 and is fixedly connected with the sliding frame 22. The connecting rod 29 is not in sliding seal connection with the gas storage tank 27. External gas can flow through the gap between the connecting rod 29 and the gas storage tank 27. The sliding frame 22 moves up and down and drives the movable plate 28 to move up and down under the transmission of the connecting rod 29.

[0050] The lower part of the gas storage tank 27 is provided with an air inlet and an air outlet. Specifically, the air inlet and the air outlet are arranged on the side wall of the bottom of the gas storage tank 27. The air inlet and the air outlet are in communication with the inside of the gas storage tank 27. The gas storage tank 27 is externally provided with an air inlet pipe 30 and an air outlet pipe 31. The air inlet pipe 30 and the air outlet pipe 31 are respectively in communication with the inside of the gas storage tank 27 through the air inlet and the air outlet. The air inlet pipe 30 and the air outlet pipe 31 are respectively provided with an air inlet one-way valve 32 and an air outlet one-way valve 33. The air inlet one-way valve 32 only allows gas to enter the inside of the gas storage tank 27 from the outside. The air outlet one-way valve 33 only allows gas to be discharged from the inside of the gas storage tank 27 to the outside. When the movable plate 28 moves downward, the pressure inside the gas storage tank 27 increases, and the gas in the gas storage tank 27 is discharged to the outside through the air outlet and the air outlet one-way valve 33. When the movable plate 28 moves upward, the pressure inside the gas storage tank 27 decreases, and external gas enters the inside of the gas storage tank 27 through the air inlet, the air inlet one-way valve 32.

[0051] A wedge block 34 is in sliding seal connection with the inner bottom of the gas storage tank 27. The wedge block 34 is located below the movable plate 28 and is arranged on the bottom of the gas storage tank 27. The side wall of the wedge block 34 abuts against the side wall of the gas storage tank 27 to maintain a good sealing state. The wedge block 34 has an inclined surface 35 and a first through hole 36 penetrating through the wedge block 34. A push rod 37 is arranged on the bottom of the movable plate 28. During the downward movement of the movable plate 28, the push rod 37 and the inclined surface 35 can push the wedge block 34 to slide so that the first through hole 36 is in communication with the air outlet. Specifically, when the movable plate 28 moves downward, the push rod 37 moves downward and abuts against the inclined surface 35, and the inclined surface 35 pushes the wedge block 34 to slide. During the sliding process of the wedge block 34, the side wall of the wedge block 34 always abuts against the side wall of the gas storage tank 27 to maintain a good sealing property between the wedge block 34 and the gas storage tank 27. When the movable plate 28 slides to a certain distance, the wedge block 34 slides to a position where the first through hole 36 is in communication with the air outlet. At this time, the gas is discharged from the inside of the gas storage tank 27 through the air outlet.

[0052] In addition, it should be noted that the movable plate 28 needs to be moved downward by a certain distance to enable the first through hole 36 to communicate with the gas outlet, and in this process, the gas in the gas storage tank 27 is compressed, and when the first through hole 36 communicates with the gas outlet, the impact force of the gas discharge can be greater, thereby providing better purging effect. A fourth elastic member 38 for resetting the wedge block 34 after sliding is arranged between the wedge block 34 and the gas storage tank 27. Specifically, the fourth elastic member 38 is a fourth spring, one end of which is fixedly connected with the wedge block 34, and the other end of which is fixedly connected with the gas storage tank 27. When the fourth elastic member 38 is in a natural state, the first through hole 36 and the gas outlet are misaligned, that is, the interior of the gas storage tank 27 is not in communication with the gas outlet. When the movable plate 28 moves downward, the push rod 37 pushes the wedge block 34 to move through the inclined surface 35 to enable the first through hole 36 to communicate with the gas outlet, and in this process, the fourth elastic member 38 is elastically stressed (that is, the fourth spring is compressed). When the movable plate 28 moves upward, the wedge block 34 returns to the original state under the elastic force of the fourth elastic member 38, and the first through hole 36 and the gas outlet are misaligned again.

[0053] The bottom plate 1 is fixed with a one-end-opened spray pipe 39, and the spray pipe 39 is provided with a spray head 40. The open end of the spray pipe 39 communicates with the gas outlet pipe 31. The gas discharged from the gas storage tank 27 enters the spray pipe 39 through the gas outlet pipe 31 and is finally sprayed out of the spray head 40. The gas sprayed out of the spray head 40 blows toward the bolt 4 and the nut 3, which can clean the cutting debris and dust adhered to the bolt 4 and the nut 3. Since dust and debris can increase the resistance during rotation, the measured torque value is biased high, so it is necessary to clean them during detection.

[0054] Referring to Figure 5 In the embodiment, a self-rotation assembly is arranged between the spray pipe 39 and the gas outlet pipe 31, and the self-rotation assembly comprises a horizontally arranged annular block 41. The annular block 41 is fixed on the bottom plate 1 and surrounds the torque measurement assembly 2. A first annular groove is formed in the top of the annular block 41 and extends along the circumferential direction of the annular block 41. A second through hole is formed in the outer side wall of the annular block 41 and communicates with the first annular groove. The second through hole communicates with the gas outlet pipe 31. The gas flowing out of the gas outlet pipe 31 enters the first annular groove through the second through hole.

[0055] A self-rotation block 42 is arranged in the first annular groove, the self-rotation block 42 is in rotational sealing connection with the first annular groove, a second annular groove is formed in the side wall of the self-rotation block 42 and extends along the circumferential direction of the self-rotation block 42, a plurality of blades 43 are arranged in the second annular groove and are uniformly arranged along the circumferential direction of the second annular groove, and the spray pipe 39 is arranged at the top of the self-rotation block 42 and is in communication with the inside of the second annular groove at the open end. When the gas is delivered into the first annular groove through the gas outlet pipe 31, the self-rotation block 42 can be rotated through the blades 43. The gas entering the first annular groove from the gas outlet pipe 31 blows to the blades 43, and the blades 43 are forced to rotate the self-rotation block 42. The rotation of the self-rotation block 42 drives the spray pipe 39 to rotate, and the spray pipe 39 drives the spray head 40 to rotate around the bolt 4, so that the bolt 4 is swept in a larger range, and the sweeping effect is improved.

[0056] Further, the annular block is integrally connected with a limiting ring for limiting the self-rotation block at the top.

[0057] The second aspect of the application: A nut 3 locking torque measurement method, comprising the following steps Step one, the nut 3 is sleeved on the top of the bolt 4.

[0058] Step two, start the hydraulic push rod 26, the hydraulic push rod 26 drives the sliding frame 22 to move downward, so as to drive the mounting seat 5 to move downward until the limiting block 8 abuts against the top of the nut 3. When the limiting block 8 abuts against the top of the nut 3, the hydraulic push rod 26 continues to drive the sliding frame 22 to move downward. At this time, the first spring is elastically deformed due to the force, the first rod body 24 penetrates into the inside of the second rod body 25, and the downward elastic force of the first spring is applied to the two clamping parts 6 through the limiting block 8 to make the two clamping parts 6 close to each other.

[0059] Step three, starting the motor 23 drives the first rod body 24 to rotate, the first rod body 24 drives the second rod body 25 to rotate, the second rod body 25 drives the mounting seat 5 to rotate, and then drives the nut 3 to rotate through the clamping part 6. The rotation of the nut 3 makes the nut 3 move downward along the bolt 4, and the tightening operation of the nut 3 is completed. The torque measurement assembly 2 completes the torque measurement in this process.

[0060] Step four, after the nut 3 is tightened, the motor 23 is started to make the motor 23 reverse, the motor 23 drives the first rod body 24 to reverse rotation, the nut 3 moves upward along the bolt 4, and the nut 3 returns to the original state.

[0061] Step five, the hydraulic push rod 26 performs a return action, pulls the sliding frame 22 to move upward, so as to make the sliding frame 22 return to the original state.

[0062] It should be understood that the above embodiments are only to illustrate the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and it cannot be considered that the specific implementation of the present application is limited to these descriptions. For ordinary skilled in the art to which the present application belongs, without departing from the concept of the present application, some simple deductions or substitutions can be made, and any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A nut tightening torque measuring device, characterized in that: include: A horizontally arranged base plate; A torque measuring assembly is mounted on the base plate, and a measuring end is provided on the top of the torque measuring assembly. The measuring end is detachably connected to a mounting portion for welding to a vertically arranged bolt; A clamping assembly, the clamping assembly comprising a mounting seat, the mounting seat being movably connected to two oppositely disposed clamping portions, the two clamping portions each having a clamping surface parallel to the bolt axis, the two clamping surfaces being oppositely disposed and respectively used to clamp any two opposite sides of the nut, and both clamping surfaces being provided with a limit block; One-way locking assembly, the one-way locking assembly consists of two groups, both of which are arranged on the mounting base and are used to lock the two clamping parts respectively. When the two clamping parts are subjected to downward force, the nut applies a reaction force to the clamping parts through the limit block to make the two clamping parts move closer to each other. The one-way locking assembly is in positive motion during this process and does not restrict the movement of the clamping parts. After the force on the clamping parts is removed, the clamping parts move downward under the influence of gravity and separate from the one-way locking assembly, and the two clamping parts separate from each other. A driving assembly is provided with a movable connection between the driving assembly and the mounting seat, a first elastic member is provided between the driving assembly and the mounting seat, and the driving assembly is used to drive the mounting seat to move in a vertical direction and drive the mounting seat to rotate.

2. A nut tightening torque measuring device according to claim 1, characterized in that: The side wall of the clamping portion has a first mounting surface perpendicular to the clamping surface, and a first sliding groove is provided on the first mounting surface. The first sliding groove is inclined upward near one end of the bolt, and a first slider is provided in the first sliding groove. The width of the first slider is smaller than the width of the first sliding groove, and the first slider is fixedly connected to the mounting seat.

3. A nut tightening torque measuring device according to claim 2, characterized in that: The one-way locking assembly includes a first tooth plate and a second tooth plate, wherein the first tooth plate is arranged on the top of the clamping portion, and the second tooth plate is located above the first tooth plate and is slidably connected to the mounting seat along the vertical direction, and the first tooth plate and the second tooth plate are provided with mutually locking first and second locking teeth on opposite sides; A second elastic member is provided between the second tooth plate and the mounting seat.

4. A nut tightening torque measuring device according to claim 3, characterized in that: The limiting block is slidably arranged on the clamping portion along a direction perpendicular to the clamping surface. A third elastic member is arranged between the limiting block and the clamping portion. The side of the limiting portion away from the clamping surface is an outwardly concave arc surface.

5. A nut tightening torque measuring device according to any one of claims 1 to 4, characterized in that: The drive assembly includes a mounting bracket vertically arranged on the base plate, a sliding bracket provided on the mounting bracket, the sliding bracket being capable of sliding on the mounting bracket along a vertical direction, a motor provided on the sliding bracket, an output shaft of the motor extending downward and plugging into the mounting seat, and the first elastic member being provided between the output shaft of the motor and the mounting seat; A hydraulic push rod is provided on the mounting bracket, and a telescopic end of the hydraulic push rod is connected to the sliding frame.

6. A nut tightening torque measuring device according to claim 5, characterized in that: A purge assembly is provided on the bottom plate, and the purge assembly includes an air storage box, a movable plate and a connecting rod. The air storage box is fixed to the bottom plate, the air storage box is located below the sliding frame, the movable plate is located inside the air storage box, the movable plate is slidably and sealedly connected to the air storage box along the vertical direction, and the connecting rod is provided between the sliding frame and the movable plate, one end of the connecting rod is connected to the movable plate, and the other end extends upward, passes through the air storage box, and is connected to the sliding frame; An air inlet and an air outlet are respectively provided at the lower portion of the air storage box, and the air inlet and the air outlet are both communicated with the interior of the air storage box. An air inlet pipe and an air outlet pipe are provided on the outside of the air storage box, and the air inlet pipe and the air outlet pipe are respectively communicated with the interior of the air storage box through the air inlet and the air outlet, and an air inlet check valve and an air outlet check valve are respectively provided on the air inlet pipe and the air outlet pipe; A wedge is slidably and sealably connected to the bottom of the air storage box. The wedge is located below the movable plate. The wedge has an inclined surface. A first through-hole is formed through the wedge. A push rod is provided at the bottom of the movable plate. When the movable plate moves downward, the push rod and the inclined surface can push the wedge to slide so that the first through-hole is connected to the air outlet. A fourth elastic member is provided between the wedge and the air storage box for returning the wedge to its original position after sliding. A nozzle with an open end is fixed on the bottom plate. A nozzle is provided on the nozzle. The open end of the nozzle is communicated with the air outlet pipe.

7. A nut tightening torque measuring device according to claim 6, characterized in that: A rotation assembly is provided between the nozzle and the air outlet pipe, the rotation assembly comprising a horizontally arranged annular block, the annular block being fixed to the base plate and arranged around the torque measuring assembly, a first annular groove being provided on the top of the annular block, the first annular groove extending along the circumference of the annular block, a second through hole being provided on the outer side wall of the annular block communicating with the first annular groove, and the second through hole being communicated with the air outlet pipe; An annular rotating block is arranged in the first annular groove, and the rotating block is rotatably sealed with the first annular groove. A second annular groove is provided on the side wall of the rotating block, and the second annular groove extends along the circumferential direction of the rotating block. A plurality of blades are arranged in the second annular groove, and the plurality of blades are evenly arranged along the circumferential direction of the second annular groove. The nozzle is arranged on the top of the rotating block, and the open end of the nozzle is connected to the inside of the second annular groove. When the outlet pipe transports gas into the first annular groove, the rotating block can be rotated through the blades.

8. A method for measuring a nut tightening torque, characterized in that: The nut tightening torque measuring device according to claim 7 comprises the following steps: Step 1: Put the nut on the top of the bolt; Step 2: Start the hydraulic push rod, which drives the sliding frame to move downward, thereby driving the mounting seat to move downward until the limit block abuts against the top of the nut. When the limit block abuts against the top of the nut, the hydraulic push rod continues to drive the sliding frame downward. At this time, the first spring will elastically deform due to the force, and the first rod body will penetrate deep into the second rod body. The downward elastic force generated by the first spring is applied to the two clamping parts through the limit block to make the two clamping parts move closer to each other. Step 3: Start the motor to drive the first rod to rotate, the first rod drives the second rod to rotate, the second rod drives the mounting base to rotate, and then drives the nut to rotate through the clamping part. The rotation of the nut causes the nut to move downward along the bolt, completing the tightening operation of the nut. During this process, the torque measurement assembly completes the torque measurement; Step 4: After the nut is tightened, start the motor to reverse the rotation of the motor, drive the first rod to rotate in the opposite direction, and the nut moves upward along the bolt, and the nut returns to its original state; Step 5: The hydraulic push rod performs a return motion, pulling the sliding frame upward to restore the sliding frame to its original state.

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