Standard stress coaxiality generating device

Abstract

The invention relates to a standard stress coaxiality generating device which comprises a supporting frame, a tension generating system, a multi-dimensional force sensor, an angle position adjusting mechanism and a horizontal posture adjusting mechanism, the supporting frame is of a hollow-out structure, the tension generating system is arranged at the top of the supporting frame to provide tension, the multi-dimensional force sensor is arranged at the output end of the tension generating system, and the angle position adjusting mechanism is arranged at the output end of the multi-dimensional force sensor. The angle position adjusting mechanism is arranged in the supporting frame and used for adjusting the angle direction of the tested piece, the angle position adjusting mechanism is connected with the multi-dimensional force sensor, the clamping direction faces the bottom of the supporting frame, and the horizontal posture adjusting mechanism is arranged in the supporting frame and used for adjusting the horizontal position of the tested piece and located at the bottom end of the supporting frame. The clamping direction of the horizontal posture adjusting mechanism faces the top of the supporting frame and corresponds to the angle position adjusting mechanism, the angle direction and the horizontal position of the measured piece are adjusted in an omnibearing mode, and the deviation of the measured piece in the angle direction and the horizontal position is effectively corrected.

Description

Technical Field

[0001] This application relates to the field of mechanical measurement and calibration technology, and in particular to a standard force coaxiality generating device. Background Technology

[0002] National metrological verification regulations stipulate that material testing machines must undergo periodic verification to ensure data accuracy and normal operation. During the verification process, coaxiality is a crucial verification item, and its test results directly determine the overall technical performance and qualification of the material testing machine. Coaxiality reflects the degree of coincidence between the center lines of the upper and lower clamps of the sample clamping device and the axis of the test force. In actual use, coaxiality deviation causes the testing machine to apply undesirable non-axial forces (or additional torques) to the assembled sample, resulting in bending. This will lead to serious deviations in relevant test parameters such as elastic modulus, plastic elongation, and material fatigue life in the material test results.

[0003] Coaxiality sensors are primarily used to test the coaxiality of testing machines under simulated actual stress conditions. Their accuracy directly affects the correctness of the testing machine's calibration and adjustment. Calibration of a coaxiality sensor should begin by establishing a standard coaxial stress state and measuring the output of each strain gauge as the zero point of coaxiality. Then, a standard non-coaxial stress state should be established as the coaxiality calibration point. Currently, domestic and international metrology institutions have not yet established coaxiality standard devices, creating a gap in the field of coaxiality sensor calibration and affecting the assessment of coaxiality sensor performance. Summary of the Invention

[0004] To address the problem that traditional coaxiality sensors cannot determine their performance, this invention provides a standard force coaxiality generating device, comprising: a support frame, a tension generating system, a multi-dimensional force sensor, an angle position adjustment mechanism, and a horizontal attitude adjustment mechanism; The support frame has a hollow structure; The tension generating system is located at the top of the support frame to provide tension; The multidimensional force sensor is installed at the output end of the tension generating system; The angle position adjustment mechanism is located inside the support frame and is suitable for adjusting the angle direction of the measured part. The angle position adjustment mechanism is connected to the multi-dimensional force sensor and the clamping direction is towards the bottom of the support frame. The horizontal attitude adjustment mechanism is located inside the support frame and is suitable for adjusting the horizontal position of the test piece. It is located at the bottom of the support frame, and the clamping direction of the horizontal attitude adjustment mechanism is towards the top of the support frame, corresponding to the angle position adjustment mechanism.

[0005] In one possible implementation, the angle position adjustment mechanism includes: an outer angle frame, an adjustment element, an angle clamping sleeve, and an angle adjustment bolt; The outer angle frame is a hollow structure with an open bottom, and the top is connected to the multi-dimensional force sensor. Through angle adjustment holes are opened on opposite sides of the outer angle frame. The adjusting member is disposed inside the outer angle frame and is rotatably embedded in the angle adjustment hole at both ends. The adjusting member can rotate relative to the outer angle frame along the circumferential direction of the angle adjustment hole, and a clamping hole is provided at the bottom of the adjusting member. The angle clamping sleeve is a columnar structure with an annular cross-section, which is disposed inside the clamping hole and is suitable for clamping the top position of the workpiece being measured. The angle adjustment bolt passes through the bottom of the outer frame and abuts against the adjustment component.

[0006] In one possible implementation, the adjusting element includes: an angle adjusting block and a central axis; The angle adjustment block has a block-shaped structure with a bottom opening inside, and there is a preset space between it and the inner wall of the outer angle frame; The central axis is a cylindrical structure with a circular cross-section, and there are two central axes, which are arranged opposite to each other on both sides of the angle adjustment block; The central shaft matches the angle adjustment hole, enabling the angle adjustment block to rotate relative to the outer frame.

[0007] In one possible implementation, the angle position adjustment mechanism further includes: a bearing; The bearing is disposed inside the outer frame and sleeved on the outside of the central shaft; The bearing is a semi-circular split bearing, comprising a first bearing and a second bearing. The first bearing is rotatably connected to one of the central shafts of the adjusting member, and the second bearing is rotatably connected to the other central shaft of the adjusting member.

[0008] In one possible implementation, the horizontal attitude adjustment mechanism includes: a displacement adjustment block, a displacement clamping sleeve, a displacement outer frame, and a displacement adjustment bolt; The displacement outer frame is a hollow structure with an open top, and its bottom is connected to the bottom of the support frame. Displacement adjustment holes are opened on opposite sides of the displacement outer frame. The displacement adjustment block is a columnar structure with an annular cross-section, which is set inside the displacement outer frame, passes through the top opening of the outer frame, and is spaced by a preset space from the inner wall of the displacement outer frame, so that it can move horizontally inside the displacement outer frame. The displacement clamping sleeve is a cylindrical structure with an annular cross-section, which fits against the inner side of the displacement adjustment block and is suitable for clamping the bottom position of the measured part. The displacement adjusting bolt passes through the displacement adjusting hole and abuts against the adjusting block.

[0009] In one possible implementation, an annular displacement adjustment groove is provided at the inner bottom end of the displacement outer frame along the circumferential direction. The bottom of the displacement adjustment block has a horizontally extending annular adjustment part, which is embedded inside the displacement adjustment groove. The height of the adjustment section is matched with the width of the displacement adjustment groove.

[0010] In one possible implementation, the displacement adjusting bolt is a fine-thread bolt, and the displacement adjusting bolt is provided with a locking nut; It also includes a first measuring element, which is a grating ruler, mounted on the horizontal attitude adjustment mechanism, for measuring the displacement distance of the displacement adjustment block in real time.

[0011] In one possible implementation, the angle adjusting bolt is a fine-thread bolt, and the angle adjusting bolt is provided with a locking nut; It also includes a second measuring element, which is a grating ruler, mounted on the angle adjustment mechanism, for measuring the rotation angle of the angle adjustment block in real time.

[0012] In one possible implementation, the support frame includes an upper support, a lateral support frame, and a lower support. The upper bracket is fixedly connected to the top of the lateral support frame, and the bottom of the lateral support frame is fixedly connected to the lower support. The tension generating system is mounted on the upper support; The horizontal attitude adjustment mechanism is located on the top of the lower support; The angle position adjustment mechanism is located between the upper support and the lower support.

[0013] In one possible implementation, the multidimensional force sensor is a six-dimensional force sensor.

[0014] The beneficial effects of a standard force coaxiality generating device according to an embodiment of this application are as follows: it enables calibration of the coaxiality zero point of the coaxiality sensor and omnidirectional adjustment of the angular direction and horizontal position of the measured part. This effectively corrects deviations in the angular and horizontal positions of the measured part, solving problems such as poor accuracy in generating the coaxiality zero point, slow adjustment process, and unintuitive measurement results in existing devices. Specifically, the force generating system provides only vertical force, the angular direction of the measured part is adjusted by the angular position adjustment mechanism, and the horizontal position adjustment mechanism is adjusted by the horizontal attitude adjustment mechanism. This achieves omnidirectional adjustment of the angular direction and horizontal position of the measured part, effectively correcting deviations in the angular and horizontal positions and ensuring that the measured part remains coaxial during the force application process.

[0015] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0017] Figure 1 This invention provides a schematic diagram of the main structure of a standard force coaxiality generating device according to an embodiment of this application. Figure 2 A schematic diagram of the main structure of the angle position adjustment mechanism according to an embodiment of this application is shown; Figure 3 This illustration shows another main structural diagram of the angle position adjustment mechanism according to an embodiment of this application; Figure 4 A cross-sectional schematic diagram of the angle position adjustment mechanism according to an embodiment of this application is shown; Figure 5 A schematic diagram of the main structure of the horizontal attitude adjustment mechanism according to an embodiment of this application is shown; Figure 6 This is a cross-sectional schematic diagram of a horizontal attitude adjustment mechanism according to an embodiment of this application. Detailed Implementation

[0018] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0019] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0022] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0023] National metrological verification regulations stipulate that material testing machines must undergo periodic verification to ensure data accuracy and normal operation. During the verification process, coaxiality is a crucial verification item, and its test results directly determine the overall technical performance and qualification of the material testing machine. Coaxiality reflects the degree of coincidence between the center lines of the upper and lower clamps of the sample clamping device and the axis of the test force. In actual use, coaxiality deviation causes the testing machine to apply undesirable non-axial forces (or additional torques) to the assembled sample, resulting in bending. This will lead to serious deviations in relevant test parameters such as elastic modulus, plastic elongation, and material fatigue life in the material test results.

[0024] Coaxiality sensors are mainly used to test the coaxiality of a testing machine under simulated actual stress conditions. Their accuracy directly affects the correctness of the testing machine's calibration and adjustment. Calibration of a coaxiality sensor should begin by establishing a standard coaxial stress state and measuring the output of each strain gauge as the zero point of coaxiality. Then, a standard non-coaxial stress state should be established as the coaxiality calibration point.

[0025] like Figure 1 As shown, a standard force coaxiality generating device according to an embodiment of this application includes: a support frame, a tension generating system 20, a multi-dimensional force sensor 70, an angle position adjustment mechanism 80, and a horizontal attitude adjustment mechanism 90. The support frame has a hollow structure. The tension generating system 20 is located on the top of the support frame and provides tension. The multi-dimensional force sensor 70 is located at the output end of the tension generating system 20. The angle position adjustment mechanism 80 is located inside the support frame and is suitable for adjusting the angle direction of the measured object. The angle position adjustment mechanism 80 is connected to the multi-dimensional force sensor 70, and its clamping direction is towards the bottom of the support frame. The horizontal attitude adjustment mechanism 90 is located inside the support frame and is suitable for adjusting the horizontal position of the measured object. It is located at the bottom of the support frame, and its clamping direction is towards the top of the support frame, corresponding to the angle position adjustment mechanism 80.

[0026] In this specific embodiment, the coaxiality zero point of the coaxiality sensor is calibrated, enabling omnidirectional adjustment of the angular direction and horizontal position of the measured component. This effectively corrects deviations in the angular and horizontal positions of the measured component, solving problems such as poor accuracy in coaxiality zero point generation, slow adjustment process, and unintuitive measurement results in existing devices. Specifically, the tension generation system 20 provides tension only in the vertical direction, the angle position adjustment mechanism 80 adjusts the angular direction of the measured component, and the horizontal attitude adjustment mechanism 90 adjusts the horizontal position of the measured component. This achieves omnidirectional adjustment of the angular direction and horizontal position of the measured component, effectively correcting deviations in the angular and horizontal positions of the measured component and ensuring that the measured component remains coaxial during the force application process.

[0027] The support frame adopts a hollow structure design, which is a hollow ring-shaped cuboid structure. The hollow space inside is used to set up a multi-dimensional force sensor 70, an angle position adjustment mechanism 80, a horizontal attitude adjustment mechanism 90, and the test piece.

[0028] The tension generating system 20 is mounted on top of the support frame. Its main function is to provide stable and controllable tension for the entire device. This tension is transmitted to the test piece through the subsequent multi-dimensional force sensor 70 and angle position adjustment mechanism 80, simulating the tensile load borne by the test piece in actual operation. Furthermore, the tension generating system 20 can be a hydraulic drive system or an electric cylinder drive system. The multi-dimensional force sensor 70 is installed at the output end of the tension generating system 20. Its function is to detect in real time the magnitude and direction of the tension output by the tension generating system 20, as well as other component forces generated during the force application process. Through the detection data of the multi-dimensional force sensor 70, the operator can accurately understand the actual stress state of the tested part, determine whether the coaxiality of the tested part meets the requirements under the current stress condition, and also provide data basis for subsequent adjustments to the angle position adjustment mechanism 80 and the horizontal attitude adjustment mechanism 90, ensuring that the device can accurately adjust the coaxiality of the tested part. The angle position adjustment mechanism 80 is installed inside the support frame and connected to the multi-dimensional force sensor 70. Its clamping direction faces the bottom of the support frame, and it is mainly used to precisely adjust the angle of the measured part. The horizontal attitude adjustment mechanism 90 is also located inside the support frame at the bottom end. Its clamping direction faces the top of the support frame, corresponding to the angle position adjustment mechanism 80. Its main function is to adjust the horizontal position of the measured part.

[0029] In one specific embodiment, see [reference] Figures 2-3 The angle position adjustment mechanism 80 includes: an outer angle frame 81, an adjusting component, an angle clamping sleeve 85, and an angle adjusting bolt 84. The outer angle frame 81 is a hollow structure with an open bottom and is connected to the multi-dimensional force sensor 70 at the top. Angle adjustment holes are opened on opposite sides of the outer angle frame 81. The adjusting component is set inside the outer angle frame 81 and is rotatably embedded in the angle adjustment holes at opposite ends. The adjusting component can rotate relative to the outer angle frame 81 in the circumferential direction of the angle adjustment holes. A clamping hole is opened at the bottom of the adjusting component. The angle clamping sleeve 85 is a columnar structure with an annular cross section and is set inside the clamping hole. It is suitable for clamping the top position of the measured object. The angle adjusting bolt 84 passes through the bottom of the outer frame and abuts against the adjusting component.

[0030] In this specific embodiment, the angle clamping sleeve 85 fits snugly within the bottom clamping hole of the adjusting member, with one end clamping the workpiece under test, making the workpiece under test, the angle clamping sleeve 85, and the adjusting member a single unit. The adjusting member is rotatably disposed inside the angle outer frame 81, and is threadedly connected to the angle outer frame 81 via an angle adjusting bolt 84, which passes through the angle outer frame 81 and abuts against the adjusting member. Thus, when the angle of the workpiece under test needs to be adjusted, the angle adjusting bolt 84 is loosened to adjust the angle, and after angle calibration is completed, the angle adjusting bolt 84 is tightened.

[0031] The outer angle frame 81, serving as the basic support component of the angle position adjustment mechanism 80, features a hollow structure with an open bottom, extending an angle clamping sleeve 85 to hold the top of the workpiece under test. The top of the outer angle frame 81 is connected to the multi-dimensional force sensor 70, ensuring that the tension output by the tension generation system 20 is sequentially transmitted through the multi-dimensional force sensor 70 and the outer angle frame 81 to the adjusting component and the workpiece under test, guaranteeing smooth and stable tension transmission. Simultaneously, through-hole angle adjustment holes are provided on opposite sides of the outer angle frame 81, offering support and guidance for the rotation of the adjusting component. The adjusting component is installed inside the outer angle frame 81, with its two ends rotatably embedded in the angle adjustment hole. This allows the adjusting component to rotate flexibly relative to the outer angle frame 81 along the circumferential direction of the angle adjustment hole, thereby adjusting the angle of the measured part. A clamping hole is provided at the bottom of the adjusting component for installing the angle clamping sleeve 85, providing a stable installation position for the angle clamping sleeve 85. Among them, see Figure 4 The angle clamping sleeve 85 adopts a cylindrical structure with an annular cross-section and is installed inside the clamping hole at the bottom of the adjusting component. Its main function is to clamp the top position of the test piece. Since the dimensions and materials of the test piece may vary, the angle clamping sleeve 85 can be designed and replaced according to the specific conditions of the test piece to ensure a firm and reliable clamping while avoiding damage to the surface of the test piece during clamping. The annular cylindrical structure design allows the angle clamping sleeve 85 to evenly wrap around the test piece, ensuring that there is no localized stress concentration during the test piece's stress application, thereby improving the accuracy of the test results. The angle adjusting bolt 84 passes through the bottom of the outer angle frame 81 and abuts against the adjusting component. By rotating the angle adjusting bolt 84, the adjusting component can be tightened or loosened. The angle adjusting bolt 84 and the outer angle frame 81 are connected by threads. Through the self-locking effect of the threads, the adjusting component can be fixed in the current position after adjustment, preventing displacement of the adjusting component during the stress process and ensuring the stability of the angle of the measured component.

[0032] In one specific embodiment, the adjusting component includes an angle adjusting block 82 and a central shaft 83. The angle adjusting block 82 has a block-shaped structure with a bottom opening and is spaced apart from the inner wall of the outer angle frame 81 by a preset space. The central shaft 83 is a cylindrical structure with a circular cross-section, and there are two central shafts 83, which are arranged opposite to each other on both sides of the angle adjusting block 82. The central shaft 83 matches the angle adjustment hole and can drive the angle adjusting block 82 to rotate relative to the outer frame.

[0033] In this specific embodiment, the angle adjustment block 82 and the central shaft 83 are integrally formed. The angle adjustment block 82 is rotatably connected to the outer angle frame 81 through the central shafts 83 on both sides, realizing the adjustment of the angle direction of the measured part. In addition, the preset gap between the angle adjustment block 82 and the inner wall of the outer frame eliminates the mechanical interference between the adjustment block and the outer frame when the adjustment block rotates, and will not affect the rotation of the adjustment block, avoiding rotation jamming or angle adjustment lag caused by frictional resistance. Thus, when the angle adjustment bolt 84 pushes the angle adjustment block 82, the adjustment block rotates in the adjustment hole of the outer angle frame 81 through the central shafts 83 on both sides. Due to the high-precision matching between the central shaft 83 and the adjustment hole and the dual-axis support structure, the rotation process of the adjustment block is smooth and without deviation, thereby driving the angle clamping sleeve 85 and the measured part to rotate accurately, realizing the correction of angle deviation. At the same time, the preset space between the adjustment block and the inner wall of the outer frame avoids frictional interference during rotation, ensuring that the accuracy of angle adjustment is not affected by mechanical resistance.

[0034] The angle adjustment block 82 has an opening at the bottom and a clamping hole for installing the angle clamping sleeve 85. The angle adjustment block 82 is spaced apart from the inner wall of the outer angle frame 81 by a preset space. This preset space is to avoid friction or collision between the adjustment block and the inner wall of the outer frame when the adjustment block rotates, to ensure smooth rotation, and to provide compensation space for the processing error of the adjustment block. The central shaft 83 adopts a cylindrical structure with a circular cross-section, which can reduce the frictional resistance with the angle adjustment hole and improve the smoothness of rotation. The two central shafts 83 are arranged opposite each other on both sides of the angle adjustment block 82, so that the adjustment block forms a dual-axis support structure. Compared with single-axis support, dual-axis support can avoid eccentricity or tilting when the adjustment block rotates, ensuring that the rotation axis of the adjustment block is completely coincident with the axis of the angle adjustment hole, improving the reference accuracy of angle adjustment. The matching between the central shaft 83 and the angle adjustment hole not only refers to size matching, but also includes coaxiality matching, ensuring that the central shaft 83 can rotate smoothly in the adjustment hole without radial runout. In one specific embodiment, the angle position adjustment mechanism 80 further includes a bearing 86, which is disposed inside the outer frame and sleeved on the outside of the central shaft 83. The bearing 86 is a semi-circular split bearing 86, including a first bearing 86 and a second bearing 86. The first bearing 86 is rotatably connected to one central shaft 83 of the adjustment member, and the second bearing 86 is rotatably connected to the other central shaft 83 of the adjustment member.

[0035] In this specific embodiment, the radial clearance of the bearing 86 can be precisely controlled, eliminating the fit clearance between the central shaft 83 and the adjusting hole, preventing radial runout when the central shaft 83 rotates, and ensuring that the rotation axis of the angle adjusting block 82 remains stable, thus improving the repeatability of angle adjustment. Furthermore, the use of semi-circular split bearings solves the problem of insufficient installation space for the integral bearing 86. The bearing 86 can be installed without disassembling the angle adjusting block 82 or the outer frame; simply insert the two semi-circular bearings from both sides of the adjusting hole and then mate them with the central shaft 83.

[0036] In one specific embodiment, see [reference] Figure 5 The horizontal adjustment mechanism 90 includes: a displacement adjustment block 93, a displacement clamping sleeve 92, a displacement outer frame 91, and a displacement adjustment bolt 94. The displacement outer frame 91 is a hollow structure with an open top and is connected to the bottom of the support frame. Displacement adjustment holes are opened on opposite sides of the displacement outer frame 91. The displacement adjustment block 93 is a columnar structure with an annular cross-section and is set inside the displacement outer frame 91, passing through the top opening of the outer frame. The displacement adjustment block 93 is spaced from the inner wall of the displacement outer frame 91 by a preset space, allowing it to move horizontally inside the displacement outer frame 91. The displacement clamping sleeve 92 is a columnar structure with an annular cross-section and fits against the inner side of the displacement adjustment block 93. It is suitable for clamping the bottom position of the measured part. The displacement adjustment bolt 94 passes through the displacement adjustment hole and abuts against the adjustment block.

[0037] In this specific embodiment, when the multi-dimensional force sensor 70 detects a horizontal deviation in the measured part, the displacement adjustment bolt 94 in the corresponding direction can be turned to push the displacement adjustment block 93 to move in the horizontal direction. The adjustment block drives the displacement clamping sleeve 92 and the measured part to move synchronously until the sensor detects that the force direction deviation has been eliminated. At this time, the bolt is stopped from being turned. The adjustment block maintains its current horizontal position under the action of the bolt's tightening force, thus completing the horizontal correction.

[0038] The displacement outer frame 91 adopts a hollow structure with a top opening, which facilitates the installation of the displacement adjustment block 93. The hollow structure of the displacement outer frame 91 provides internal space for the horizontal displacement of the displacement adjustment block 93. Its bottom is connected to the bottom of the support frame to ensure that the reference plane of the horizontal mechanism is parallel to the overall reference plane of the device, providing a stable reference for horizontal displacement adjustment. The through displacement adjustment holes opened on both sides are the mounting carriers of the displacement adjustment bolts 94. Their axes are parallel to the horizontal direction, ensuring that the axial movement of the bolts can be directly converted into the horizontal displacement of the displacement adjustment block 93. The displacement adjustment block 93 adopts a columnar structure with an annular cross-section. The inner side of the annular structure is used to install the displacement clamping sleeve 92, and the outer side is spaced apart from the inner wall of the displacement outer frame 91 by a preset space. This preset space provides the range of motion for the horizontal displacement of the adjustment block, while avoiding friction between the adjustment block and the inner wall of the outer frame when it moves. The top of the adjustment block extends out of the outer frame, which facilitates clamping the bottom position of the measured part through the clamping sleeve, ensuring that the clamping position is on the same axis as the clamping sleeve of the angle mechanism. The horizontal displacement is achieved through the clearance fit between the adjustment block and the inner wall of the outer frame, and it can move freely along the X-axis and Y-axis directions to meet the horizontal deviation correction requirements in different directions. Among them, the displacement clamping sleeve 92 can be a hydraulic expansion sleeve, which is attached to the inside of the displacement adjustment block 93 and is used to clamp the bottom position of the test piece. The displacement adjusting bolt 94 passes through the displacement adjusting hole and abuts against the displacement adjusting block 93. The axial movement of the displacement adjusting bolt 94 drives the adjusting block to move horizontally. In addition, there are multiple displacement adjusting bolts 94, which are arranged on opposite sides of the displacement outer frame 91. By rotating the displacement adjusting bolt 94, the horizontal position of the displacement adjusting block 93 and the measured part relative to the displacement outer frame 91 is adjusted.

[0039] In one specific embodiment, see [reference] Figure 6 The bottom of the displacement outer frame 91 has an annular displacement adjustment groove 921 along the circumferential direction. The bottom of the displacement adjustment block 93 has an annular adjustment part 931 extending horizontally. The adjustment part 931 is embedded in the displacement adjustment groove. The height of the adjustment part 931 matches the opening width of the displacement adjustment groove 921.

[0040] In this specific embodiment, when the displacement adjusting bolt 94 pushes the displacement adjusting block 93 to move horizontally, the annular adjusting part 931 at the bottom of the adjusting block slides synchronously within the annular displacement adjusting groove 921 of the displacement outer frame 91. The side wall of the adjusting groove 921 provides horizontal guidance for the adjusting block, preventing the adjusting block from rotating circumferentially or shifting horizontally. At the same time, the upper and lower walls of the adjusting groove 921 are in close contact with the upper and lower surfaces of the adjusting part 931, restricting the vertical displacement of the adjusting block and ensuring that the adjusting block always maintains a horizontal posture. This, in turn, drives the bottom of the measured part to move smoothly in the horizontal direction without vertical deviation, thus improving the accuracy of horizontal correction.

[0041] The displacement outer frame 91 has an annular displacement adjustment groove 921 at its bottom interior along the circumferential direction. This groove provides circumferential guidance for the horizontal displacement of the displacement adjustment block 93. Regardless of the horizontal direction in which the adjustment block moves, the adjustment part 931 always moves within the annular groove, preventing circumferential rotation of the adjustment block. The width of the displacement adjustment groove 921, i.e., its vertical height, matches the height of the adjustment part 931, thus limiting the vertical movement of the adjustment block and preventing tilting of the measured component's axis due to vertical offset. This ensures that horizontal adjustment is performed only in the horizontal direction. The displacement adjustment block 93 has a horizontally extending annular adjustment part 931 at its bottom. The annular structure of the adjustment part 931 is adapted to the annular structure of the displacement adjustment groove 921, ensuring that the adjustment part 931 can slide smoothly within the groove. The adjustment part 931 is embedded inside the displacement adjustment groove. Through contact with the side wall of the displacement adjustment groove 921, the adjustment part 931 provides guidance for the horizontal displacement of the adjustment block, preventing tilting during the movement of the adjustment block. The height of the adjustment part 931 matches the opening width of the groove, meaning that there is no vertical gap in the adjustment part 931 within the groove. This completely restricts the vertical displacement of the adjustment block, ensuring that the adjustment block always moves in a horizontal posture and preventing the bottom position of the measured part from shifting due to tilting of the adjustment block.

[0042] In one specific embodiment, the displacement adjusting bolt 94 is a fine-thread bolt and is provided with a locking nut. It also includes a first measuring element, which is a grating ruler, set on the horizontal attitude adjustment mechanism 90, for measuring the displacement distance of the displacement adjusting block 93 in real time.

[0043] In one specific embodiment, both the angle clamping sleeve 85 and the displacement clamping sleeve 92 are hydraulic clamping sleeves or pneumatic clamping sleeves.

[0044] In one specific embodiment, the angle adjusting bolt 84 is a fine-thread bolt and is provided with a locking nut. It also includes a second measuring element, which is a grating ruler, set on the angle adjusting mechanism, for measuring the rotation angle of the angle adjusting block 82 in real time.

[0045] In one specific embodiment, the support frame includes an upper bracket 11, a lateral support frame 110, and a lower support 12. The upper bracket 11 is fixedly connected to the top of the lateral support frame 110, and the bottom of the lateral support frame 110 is fixedly connected to the lower support 12. A tension generating system 20 is disposed on the upper bracket 11, a horizontal attitude adjustment mechanism 90 is disposed on the top of the lower support 12, and an angle position adjustment mechanism 80 is located between the upper bracket 11 and the lower support 12.

[0046] In this specific embodiment, a tension generating system 20 is installed on the upper support frame, a multi-dimensional force sensor 70 is connected to the output end of the tension generating system 20, and an angle position adjustment mechanism 80 is connected to the multi-dimensional force sensor 70 and arranged vertically. The angle position adjustment mechanism 80 and the horizontal attitude adjustment mechanism 90 clamp the test piece vertically. This layout ensures that the axes of the tension generating system 20, the multi-dimensional force sensor 70, the angle position adjustment mechanism 80, the horizontal attitude adjustment mechanism 90, and the test piece are completely coincident, providing a reference axis for standard force coaxiality testing.

[0047] In one specific embodiment, the multidimensional force sensor 70 is a six-dimensional force sensor.

[0048] In one specific embodiment, a standard force coaxiality generating device further includes: a force transmission hinge 30, a tension transmission plate 40, a standard force sensor 50, and a flexible connector 60. The tension generating system 20 is mounted on the upper support frame. The output end of the tension generating system 20 is connected to the top of the tension transmission plate 40 through the force transmission hinge 30. The tension transmission plate 40 is slidably connected to the lateral support frame 110 through a linear guide rail, and the tension transmission plate 40 can only move vertically. The bottom end of the tension transmission plate 40 is connected to one end of the standard force sensor 50, and the other end of the standard force sensor 50 is connected to one end of the flexible connector 60. The other end of the flexible connector 60 is connected to one end of the multi-dimensional force sensor 70, and the other end of the multi-dimensional force sensor 70 is used to connect to the angle position adjustment mechanism 80.

[0049] In this specific embodiment, the cooperation between the force transmission hinge 30 and the flexible connector 60 can compensate for installation errors and adjustment deviations in multiple links, reduce additional torque, ensure that the tensile force is transmitted purely along the axial direction, and provide an interference-free force environment for coaxiality measurement. The introduction of the standard force sensor 50 enables the device to have force value calibration capability. By comparing with the national benchmark force value, the traceability of the tensile force measurement results can be guaranteed, meeting the stringent requirements of the metrology calibration field. The unidirectional constraint of the linear guide rail on the tensile force transmission plate 40 completely eliminates lateral force interference, ensuring that the measured part only bears axial tensile force.

[0050] The force transmission hinge 30 connects the output end of the force generating system 20 to the top of the force transmission plate 40. Its core function is to eliminate the installation coaxiality error between the output end of the force generating system 20 and the force transmission plate 40. Since minor deviations are unavoidable in machining and assembly, the force transmission hinge 30 can compensate for these deviations through its own rotational degree of freedom, avoiding the generation of additional bending moments or torques during force transmission and ensuring that the direction of the force is always along the preset vertical axis.

[0051] In this design, the tension transmission plate 40 serves as an intermediate carrier for force transmission. It is slidably connected to the lateral support frame 110 via a linear guide rail and is strictly restricted to moving only vertically. This design ensures that the output force of the tension generation system 20 is stably transmitted to downstream components. Furthermore, the guiding effect of the linear guide rail completely eliminates any horizontal offset of the tension transmission plate 40, ensuring that the tension is always transmitted axially and avoiding interference from lateral forces on the coaxiality measurement of the workpiece.

[0052] The standard force sensor 50 is connected in series between the tension transmission plate 40 and the flexible connector 60. Its function is to calibrate the tension value output by the tension generating system 20 in real time. Since the tension generating system 20 may have output errors after long-term use, the standard force sensor 50 can provide a reference force value through high-precision measurement to correct the output parameters of the tension generating system 20 and ensure that the tension applied to the test piece meets the metrological requirements.

[0053] The flexible connector 60 connects the standard force sensor 50 and the multi-dimensional force sensor 70, and is made of a material with a certain elastic deformation capability. Its function is to compensate for the slight coaxiality deviation between the angle position adjustment mechanism 80 and the tension transmission plate 40. When the angle position adjustment mechanism 80 drives the measured object to make a fine angle adjustment, the flexible connector 60 can absorb the deviation through a small deformation, avoiding the additional torque generated by this adjustment on the upstream force transmission system and ensuring the purity of force transmission.

[0054] In one specific embodiment, the linear guide rail includes a guide rail body and a slider. The guide rail body is vertically fixed on the lateral support frame 110. The slider is slidably connected to the guide rail body and is fixedly connected to the force transmission plate 40. The guide rail body is provided with a limiting protrusion and the slider is provided with a limiting groove. The limiting protrusion and the limiting groove cooperate to limit the movement range of the slider along the guide rail body.

[0055] In this specific embodiment, the rigidly connected slider and the force transmission plate 40 can eliminate relative swaying. Combined with the high-strength support of the guide rail body, even under the maximum tension, the movement can still be stable without jamming or jumping. The mechanical stops of the limiting protrusion and groove can prevent component collision damage caused by the uncontrolled tension generation system 20, and at the same time prevent the tested part from failing due to excessive stretching.

[0056] The linear guide rail consists of a guide rail body and a slider, which are vertically fixed to the inner wall of the lateral support frame 110 by bolts. The slider adopts an integral structure and is rigidly connected to the force transmission plate 40 by screws. Its inner side forms a sliding pair with the working surface of the guide rail body, allowing it to reciprocate vertically along the guide rail body and providing high-precision guidance for the force transmission plate 40. The limiting structure consists of a limiting protrusion on the guide rail body and a limiting groove on the slider. The limiting protrusion is a strip-shaped boss set along the length of the guide rail body, and the limiting groove is a strip-shaped groove opened at the corresponding position on the inner side of the slider. When the slider moves to the limit position along the guide rail body, the end face of the limiting protrusion contacts the end face of the limiting groove, forming a mechanical stop and preventing the slider from moving further.

[0057] In one specific embodiment, it also includes: a rotation generating mechanism 100, which is disposed on the lower support 12, and a horizontal attitude adjustment mechanism 90 is disposed on the top, driving the horizontal attitude adjustment mechanism 90 and the test piece, so that the output of the rod as the test piece can be measured when the sensor is at 0° and 180°, or at 90°, and different orientations can be measured according to the procedure.

[0058] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A standard force coaxiality generating device, characterized in that, include: Support frame, tension generation system, multi-dimensional force sensor, angle position adjustment mechanism and horizontal attitude adjustment mechanism; The support frame has a hollow structure; The tension generating system is located at the top of the support frame to provide tension; The multidimensional force sensor is installed at the output end of the tension generating system; The angle position adjustment mechanism is located inside the support frame and is suitable for adjusting the angle direction of the measured part. The angle position adjustment mechanism is connected to the multi-dimensional force sensor and the clamping direction is towards the bottom of the support frame. The horizontal attitude adjustment mechanism is located inside the support frame and is suitable for adjusting the horizontal position of the test piece. It is located at the bottom of the support frame, and the clamping direction of the horizontal attitude adjustment mechanism is towards the top of the support frame, corresponding to the angle position adjustment mechanism.

2. The standard force coaxiality generating device according to claim 1, characterized in that, The angle position adjustment mechanism includes: an outer angle frame, an adjustment component, an angle clamping sleeve, and an angle adjustment bolt; The outer angle frame is a hollow structure with an open bottom, and the top is connected to the multi-dimensional force sensor. Through angle adjustment holes are opened on opposite sides of the outer angle frame. The adjusting member is disposed inside the outer angle frame and is rotatably embedded in the angle adjustment hole at both ends. The adjusting member can rotate relative to the outer angle frame along the circumferential direction of the angle adjustment hole, and a clamping hole is provided at the bottom of the adjusting member. The angle clamping sleeve is a columnar structure with an annular cross-section, which is disposed inside the clamping hole and is suitable for clamping the top position of the workpiece being measured. The angle adjustment bolt passes through the bottom of the outer frame and abuts against the adjustment component.

3. The standard force coaxiality generating device according to claim 2, characterized in that, The adjusting components include: an angle adjusting block and a central shaft; The angle adjustment block has a block-shaped structure with a bottom opening inside, and there is a preset space between it and the inner wall of the outer angle frame; The central axis is a cylindrical structure with a circular cross-section, and there are two central axes, which are arranged opposite to each other on both sides of the angle adjustment block; The central shaft matches the angle adjustment hole, enabling the angle adjustment block to rotate relative to the outer frame.

4. The standard force coaxiality generating device according to claim 3, characterized in that, The angle position adjustment mechanism also includes: a bearing; The bearing is disposed inside the outer frame and sleeved on the outside of the central shaft; The bearing is a semi-circular split bearing, comprising a first bearing and a second bearing. The first bearing is rotatably connected to one of the central shafts of the adjusting member, and the second bearing is rotatably connected to the other central shaft of the adjusting member.

5. A standard force coaxiality generating device according to claim 4, characterized in that, The horizontal attitude adjustment mechanism includes: a displacement adjustment block, a displacement clamping sleeve, a displacement outer frame, and a displacement adjustment bolt; The displacement outer frame is a hollow structure with an open top, and its bottom is connected to the bottom of the support frame. Displacement adjustment holes are opened on opposite sides of the displacement outer frame. The displacement adjustment block is a columnar structure with an annular cross-section, which is set inside the displacement outer frame, passes through the top opening of the outer frame, and is spaced by a preset space from the inner wall of the displacement outer frame, so that it can move horizontally inside the displacement outer frame. The displacement clamping sleeve is a cylindrical structure with an annular cross-section, which fits against the inner side of the displacement adjustment block and is suitable for clamping the bottom position of the measured part. The displacement adjusting bolt passes through the displacement adjusting hole and abuts against the adjusting block.

6. The standard force coaxiality generating device according to claim 5, characterized in that, The inner bottom end of the displacement outer frame is provided with an annular displacement adjustment groove along the circumferential direction; The bottom of the displacement adjustment block has a horizontally extending annular adjustment part, which is embedded inside the displacement adjustment groove. The height of the adjustment section is matched with the width of the displacement adjustment groove.

7. A standard force coaxiality generating device according to claim 5, characterized in that, The displacement adjusting bolt is a fine-thread bolt, and a locking nut is provided on the displacement adjusting bolt; It also includes a first measuring element, which is a grating ruler, mounted on the horizontal attitude adjustment mechanism, for measuring the displacement distance of the displacement adjustment block in real time.

8. A standard force coaxiality generating device according to claim 3, characterized in that, The angle adjusting bolt is a fine-thread bolt, and a locking nut is provided on the angle adjusting bolt; It also includes a second measuring element, which is a grating ruler, mounted on the angle adjustment mechanism, for measuring the rotation angle of the angle adjustment block in real time.

9. A standard force coaxiality generating device according to claim 1, characterized in that, The support frame includes an upper support, a lateral support frame, and a lower support. The upper bracket is fixedly connected to the top of the lateral support frame, and the bottom of the lateral support frame is fixedly connected to the lower support. The tension generating system is mounted on the upper support; The horizontal attitude adjustment mechanism is located on the top of the lower support; The angle position adjustment mechanism is located between the upper support and the lower support.

10. A standard force coaxiality generating device according to claim 1, characterized in that, The multidimensional force sensor is a six-dimensional force sensor.

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