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CN-224231164-U - Dynamic torque calibration device of electric and pneumatic torque wrench

CN224231164UCN 224231164 UCN224231164 UCN 224231164UCN-224231164-U

Abstract

A dynamic torque calibration device of an electric and pneumatic torque wrench belongs to the technical field of torque measurement and is used for solving the technical problems that the existing static torque calibration device cannot adapt to dynamic torque characteristics and errors are generated due to impact and misalignment during working. The device comprises a sensor fixing support, a middle support and an outer spherical bearing seat, wherein the top of a base is provided with the sensor fixing support, a bolt and nut torque connection simulator penetrates through the outer spherical bearing seat and extends into the middle support, one end of the bolt and nut torque connection simulator is rigidly connected with a torque sensor, an adjusting transverse plate is connected to the bottom of the base in a sliding mode through a T-shaped structure, the end of the adjusting transverse plate is provided with a supporting assembly composed of a sliding vertical plate, a supporting block and a compression spring, the supporting block is provided with an arc-shaped hole matched with a spanner handle, the adjusting assembly comprises an adjusting screw rod and an operating block, and transverse adjustment of the supporting block is achieved through threaded transmission. The torque of the bolt and the nut is connected with the built-in belleville spring group and the conical snap ring of the simulator, and misalignment errors are compensated through axial floating. The device realizes dynamic torque measurement through the dynamic torque sensor and the buffer structure.

Inventors

  • CUI XIAOJUN

Assignees

  • 上海释格检测技术有限公司

Dates

Publication Date
20260512
Application Date
20250526

Claims (9)

  1. 1. A dynamic torque calibration device for an electric and pneumatic torque wrench, comprising: The device comprises a base (7), wherein one side of the top of the base is fixedly connected with a sensor fixing support (6), the sensor fixing support (6) is fastened with a torque sensor (5) through bolts, an intermediate support (4) is welded in the middle of the top of the base (7), and the other side of the top of the base is fixedly connected with an outer spherical bearing seat (2) through bolts; The bolt and nut torque connection simulator (3) penetrates through the outer spherical bearing seat (2) and is rotatably arranged in the middle support (4) through a bearing, and one end of the bolt and nut torque connection simulator (3) is rigidly connected with the input end of the torque sensor (5); the adjusting transverse plate (9) is in sliding connection with a T-shaped groove (12) formed in the bottom of the base (7) through a T-shaped block (19); The support assembly comprises a sliding vertical plate (16), the sliding vertical plate (16) and a sliding groove (18) formed in the end part of the adjusting transverse plate (9) form a moving pair through a sliding block (21), a support block (11) is welded at the top of the sliding vertical plate (16), an arc-shaped hole (17) matched with the outer diameter of a handle of the electric torque spanner (1) is formed in the top of the support block (11), and a compression spring (20) is arranged between the bottom of the support block (11) and the top of a side limit block (10) fixedly connected with the end surface of the adjusting transverse plate (9); The adjusting assembly comprises a fixed plate (14) welded at the bottom of the base (7), an adjusting screw rod (15) is arranged in the center of the fixed plate (14) in a penetrating mode, one end of the adjusting screw rod (15) is matched with an inner threaded hole at the end portion of the adjusting transverse plate (9), and an operating block (13) is welded at the other end of the adjusting screw rod.
  2. 2. The dynamic torque calibration device of the electric and pneumatic torque wrench according to claim 1, wherein the bolt-nut torque connection simulator (3) comprises a connection simulator main body (301), one end of the connection simulator main body (301) is connected with a bolt simulator (304) in a threaded manner, an annular groove is formed in the connection simulator main body, a clamping ring (303) is arranged in the connection simulator main body, butterfly spring groups (302) are uniformly distributed between the clamping ring (303) and the bottom surface of the groove along the circumferential direction, and an end face conical surface of the clamping ring (303) is matched with an end conical surface of the bolt simulator (304); During operation, the output end of the electric torque spanner (1) is inserted into the bolt simulator (304), the compression spring (20) pushes the supporting block (11) to enable the arc-shaped hole (17) to be tightly attached to the spanner handle, torque is buffered by the belleville spring set (302) and then transmitted to the torque sensor (5), and the torque sensor (5) converts a dynamic torque signal into an electric signal to be output.
  3. 3. The dynamic torque calibration device of an electric and pneumatic torque wrench according to claim 2, wherein the support block (11) is elastically contacted with the handle of the electric torque wrench (1) by the elastic force of the compression spring (20), the elastic contact pressure is in the range of 50N to 3000N, and the measurement range is adjustable.
  4. 4. A dynamic torque calibration device for electric and pneumatic torque wrenches according to claim 2 or 3, characterized in that the adjusting screw (15) is of a trapezoidal thread structure, the lead of which is 2mm to 4mm, and the adjusting cross plate (9) can be driven to move transversely by rotating the operating block (13), the moving precision being 0.05mm.
  5. 5. A dynamic torque calibration device for electric and pneumatic torque wrenches according to any one of claims 2-3, wherein the stack of belleville springs (302) is formed by stacking 3-5 belleville springs, the stiffness of the stack of belleville springs (302) being in the range of 100N/mm to 500N/mm for absorbing impact vibrations generated during calibration.
  6. 6. The dynamic torque calibration device of electric and pneumatic torque wrenches according to claim 4, characterized in that an axial clearance of 0.1mm to 0.3mm is provided between the snap ring (303) and the bottom surface of the groove of the connection simulator body (301), said axial clearance being used to compensate for axial misalignment errors of the electric torque wrench (1) and the bolt simulator (304).
  7. 7. A dynamic torque calibration device for electric and pneumatic torque wrenches according to any one of claims 1 to 3, characterized in that the torque sensor (5) has a measuring range of 10N-m to 1000N-m, a precision level of 0.1 and a response frequency not lower than 1000Hz.
  8. 8. A dynamic torque calibration device for electric and pneumatic torque wrenches according to any one of claims 1-3, characterized in that the surface of the arcuate holes (17) of the support block (11) is sprayed with a wear-resistant coating, which is a tungsten carbide based composite.
  9. 9. A dynamic torque calibration device for electric and pneumatic torque wrenches according to any one of claims 1 to 3, characterized in that the base (7) is welded with legs (8) at four corners of the bottom surface, the base (7) is of a monolithic cast iron structure, the flatness error of the bottom surface is not more than 0.02mm, the bottoms of the legs (8) are provided with adjustable anchor bolts, and the adjustment range of the adjustable anchor bolts is + -5 mm.

Description

Dynamic torque calibration device of electric and pneumatic torque wrench Technical Field The utility model relates to the technical field of torque wrenches, in particular to a dynamic torque calibration device of an electric and pneumatic torque wrench. Background With the increasing level of industrial intelligence, electric torque wrenches and pneumatic torque wrenches are becoming popular for precisely controlling the tightening torque of bolts, and the quality and reliability of products are improved. However, the existing calibration device and method for torque wrenches are generally applicable to the calibration of static torque of conventional manual torque wrenches, while the torque of electric and pneumatic torque wrenches is dynamic, gradually increases from 0 to a maximum value, and measurement errors caused by electric and pneumatic impact forces and misalignment exist in the calibration process, so that the calibration accuracy is improved. Therefore, it is highly desirable to develop a dynamic torque calibration device that is efficient and accurate for use with electric and pneumatic torque wrenches. Disclosure of utility model The utility model aims to solve the defects that in the prior art, the calibrating device and the calibrating method of the torque wrench are generally suitable for calibrating the static torque of a conventional manual torque wrench, the torque of an electric torque wrench and a pneumatic torque wrench is dynamic and gradually increases from 0 to the maximum value, and in the calibrating process, the measuring errors caused by electric and pneumatic impact force and misalignment exist, and the calibrating precision is improved. In order to achieve the above purpose, the present utility model adopts the following technical scheme: The dynamic torque calibration device of the electric and pneumatic torque wrench comprises a base, wherein one side of the top of the base is fixedly connected with a sensor fixing support, the sensor fixing support is used for fastening a torque sensor through a bolt; The bolt and nut torque connection simulator penetrates through the outer spherical bearing seat and is rotatably installed in the middle support through a bearing, and one end of the bolt and nut torque connection simulator is rigidly connected with the input end of the torque sensor; the adjusting transverse plate is connected with the T-shaped groove formed in the bottom of the base in a sliding manner through the T-shaped block; the support assembly comprises a sliding vertical plate, the sliding vertical plate and a sliding groove formed in the end part of the adjusting transverse plate form a moving pair through a sliding block, a support block is welded at the top of the sliding vertical plate, an arc-shaped hole matched with the outer diameter of the handle of the electric torque spanner is formed in the top of the support block, and a compression spring is arranged between the bottom of the support block and the top of a side limit block fixedly connected with the end surface of the adjusting transverse plate; The adjusting assembly comprises a fixed plate welded at the bottom of the base, an adjusting screw rod is arranged in the center of the fixed plate in a penetrating mode, one end of the adjusting screw rod is matched with an inner threaded hole at the end portion of the adjusting transverse plate, and an operating block is welded at the other end of the adjusting screw rod; The bolt-nut torque connection simulator comprises a connection simulator main body, one end of the connection simulator main body is connected with a bolt simulator through threads, an annular groove is formed in the connection simulator main body, a clamping ring is arranged in the connection simulator main body, butterfly spring sets are uniformly distributed and installed between the clamping ring and the bottom surface of the groove along the circumferential direction, and the conical surface of the end surface of the clamping ring is matched with the conical surface of the end part of the bolt simulator; The four corners of the bottom surface of the base are welded with supporting legs; During operation, the output end of the electric torque spanner is inserted into the bolt simulator, the compression spring pushes the supporting block to enable the arc-shaped hole to be tightly attached to the spanner handle, torque is buffered by the butterfly spring group and then transmitted to the torque sensor, and the torque sensor converts a dynamic torque signal into an electric signal to be output. In one possible design, the support block is in elastic contact with the electric torque wrench handle by the elastic force of the compression spring, and the elastic contact pressure ranges from 50N to 200N. In one possible design, the adjusting screw rod adopts a trapezoidal thread structure, the lead of the adjusting screw rod is 2mm to 4mm, the adjusting transverse plate can be driven to tra