Calibration device and calibration method for torsion sensor of electrical logging type vane shear apparatus

Abstract

The invention discloses an electrical logging type vane shear apparatus torsion sensor calibration device and calibration method, and relates to the technical field of geotechnical engineering in-situ tests.The calibration device comprises a calibration table, the calibration table is rotationally provided with a rotating shaft, one end of the rotating shaft is a connecting end, and the connecting end extends out of the calibration table and is used for being coaxially connected to one end of a torsion sensor; the rotary positioning mechanism is mounted on the calibration table and is used for being fixed at the other end of the torsion sensor; the torsion tension applying mechanism is in transmission connection with the rotating shaft and is used for applying torsion tension which drives the rotating shaft to rotate and changes step by step to the rotating shaft; the indicating value display equipment is used for being electrically connected with the torsion sensor and used for displaying the torque value of the torsion sensor, through the torsion sensor calibration device and calibration method of the electric measurement type vane shear apparatus, calibration of the torsion sensor can be automatically completed, and the torsion sensor calibration device and calibration method are convenient, fast, time-saving, economical and remarkable in benefit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of geotechnical engineering in-situ testing, in particular to a torsion sensor calibration device and calibration method for an electrically measured vane shear apparatus. BACKGROUND

[0002] The vane shear test is a test method for geotechnical engineering in-situ testing, which is to insert a vane head into the ground soil and perform torsional shear to test the undrained shear strength of the ground soil, and is mainly used for testing the undrained shear strength of soft cohesive soil. Soft cohesive soil has the characteristics of high water content, large void ratio, low shear strength, large compressibility, and large thixotropy, so the applicable in-situ testing methods are limited, and the vane shear test is a relatively suitable and most commonly used testing method.

[0003] The main instrument and equipment used in the vane shear test is a vane shear apparatus, which is divided into electrically measured and mechanically measured according to the different ways of obtaining data. The electrically measured type obtains test data through electronic sensors, and the mechanically measured type obtains test data through force rings and measuring instruments.

[0004] Soft cohesive soil is mostly found in water environments such as rivers, lakes, and seas, and its strength test is of great significance to the stability evaluation of engineering projects such as ports, waterways, bridges, dredging, and slopes. Due to the characteristics of the project and the site environment, the vane shear test of soft cohesive soil is mostly carried out in the water environment near the shore, and the test environment conditions are poor. Especially in water testing, it is greatly affected by wind, waves, water flow, water depth, temperature, humidity, and other factors. When the electrically measured vane shear apparatus is used for testing, the torsion sensor often produces a zero drift phenomenon, which increases the test error and affects the test quality. Therefore, the torsion sensor of the electrically measured vane shear apparatus must be calibrated regularly to ensure the test quality. Generally, it is calibrated once every three months, and the calibration interval is shorter in special cases.

[0005] Traditional torsion sensor calibration is mostly carried out by instrument manufacturers or third-party testing institutions with corresponding qualifications, which has a long cycle and high cost. SUMMARY

[0006] The purpose of the present application is to provide a torsion sensor calibration device and calibration method for an electrically measured vane shear apparatus to solve the problems existing in the prior art. The torsion sensor calibration device and calibration method for an electrically measured vane shear apparatus disclosed in the present application can be used to calibrate the torsion sensor independently, which is convenient, fast, time-saving, economical, and has significant benefits.

[0007] To achieve the above-mentioned purpose, the present application provides the following solutions: The present application provides a torsion sensor calibration device for an electrically measured vane shear apparatus, which comprises: The calibration platform is provided with a rotating shaft, one end of the rotating shaft is a connecting end, the connecting end extends out of the calibration platform and is coaxially connected to one end of a torque sensor; A rotating positioning mechanism is installed on the calibration platform and is used to fix the other end of the torque sensor; A torsion tension applying mechanism is drivingly connected to the rotating shaft and is used to apply a torsion tension to the rotating shaft, the torsion tension is used to drive the rotating shaft to rotate and gradually change; An indicating display device is used to be electrically connected to the torque sensor and is used to display the torque value of the torque sensor.

[0008] Optionally, the torsion tension applying mechanism is matched with: A pulley assembly is synchronously drivingly connected to the rotating shaft; A traction cable is wound around one end of the pulley assembly and is connected to the other end of the torsion tension applying mechanism.

[0009] Optionally, the torsion tension applying mechanism comprises: A weight disc is connected to one end of the traction cable which is not wound around the pulley assembly; A plurality of weights are sequentially stacked on the weight disc.

[0010] Optionally, the pulley assembly comprises: A torsion wheel is coaxially sleeved on the rotating shaft and synchronously rotates with the rotating shaft, one end of the traction cable is wound around the torsion wheel and the other end is connected to the torsion tension applying mechanism.

[0011] Optionally, the pulley assembly further comprises: A deflection wheel is rotatably installed on the calibration platform, one end of the traction cable is wound around the torsion wheel and the other end is connected to the torsion tension applying mechanism after passing through the deflection wheel.

[0012] Optionally, a rotating locking member is movably installed on the calibration platform along the radial direction of the rotating shaft, a protruding structure is arranged on the outer wall of the rotating shaft and is used to be clamped with the rotating locking member.

[0013] Optionally, the rotating positioning mechanism comprises: A driving motor is coaxially connected to one end of the torque sensor away from the rotating shaft, the driving motor is installed on the calibration platform through a support.

[0014] Optionally, the support comprises: A connecting column extends in the same direction as the rotating shaft, one end of the connecting column is installed on the calibration platform and the other end extends away from the calibration platform; A cantilever arm, one end of which is connected to the connecting column, and the other end of which extends to the side of the torque sensor away from the rotating shaft, and the drive motor is mounted on the cantilever arm near the torque sensor.

[0015] Optionally, the two ends of the torque sensor are connected to the rotation positioning mechanism and the rotating shaft respectively through a diameter-changing mechanism.

[0016] A calibration method is also provided, comprising the following steps: S1. Adjust the calibration platform to a stable position; S2. Connect the torsional tension application mechanism to the rotating shaft drive; S3. Coaxially mount one end of the torque sensor on the rotating shaft, and mount the rotation positioning mechanism on the other end of the torque sensor; S4. Connect the torque sensor and the display device electrically, and start the display device; S5. Zero the indicated value display device; S6. Apply torsional tension to the rotating shaft and the torque sensor step by step through the torsional tension application mechanism, and apply a corresponding torsional force in the opposite direction to the torque sensor through the rotation positioning mechanism, so that the torque sensor is in a stationary state; record the torque value of the display device after each level of torsional tension is applied and stabilized; S7. Apply the maximum torsional tension to the torque sensor through the torsional tension application mechanism, and record the torque value. Then, in reverse order, gradually remove the torsional tension and record the torque value after removing the torsional tension until the torsional tension is completely removed and the torque value after the load is removed is recorded. S8. Repeat steps S5 to S7 at least 3 times, wherein the torsional tension applied to the rotating shaft and the torque sensor by the torsional tension application mechanism is consistent each time, and the torsional force applied to the torque sensor by the rotation positioning mechanism in the opposite direction is consistent each time, and the calibration ends. S9. According to the formula FR=KM, the calibration coefficient of the torque sensor is obtained by graphical method or least squares method; Where F is the torsional tension; R is the vertical distance between the point of application of the torsional tension and the axis of rotation; K is the calibration coefficient of the torque sensor; and M is the torque value.

[0017] The present invention achieves the following technical effects compared to the prior art: In the torque sensor calibration device for an electrical vane shear apparatus disclosed in this invention, the two ends of the torque sensor are connected to a rotating shaft and a rotation positioning mechanism, respectively. The torque on the rotating shaft is applied or removed by increasing or decreasing the torsional tension through a torsional tension application mechanism, and a torque in the opposite direction is applied through the rotation positioning mechanism, thereby obtaining the torque value of the torque sensor. The calibration coefficient of the torque sensor is obtained using a graphical method or the least squares method based on the torque values ​​after different levels of loading and unloading. The entire electrical vane shear apparatus torque sensor calibration device has a simple structure, is easy to operate, and convenient to apply. It can calibrate the torque sensor of an electrical vane shear apparatus, providing reliable data. This helps improve the testing accuracy and quality of the electrical vane shear apparatus, increasing experimental efficiency and effectiveness. It has a low technical threshold, low cost, high cost-effectiveness ratio, significant economic and comprehensive benefits, and is easy to promote and apply. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Fig. 1 This is a front view of a torque sensor calibration device for an electrically conductive vane shearing apparatus, as disclosed in an example of the present invention. Fig. 2 This is a side view of a torque sensor calibration device for an electrical cross-shaped shear apparatus, as disclosed in an example of the present invention. Fig. 3 This is a top view of a torque sensor calibration device for an electrical measuring vane shear apparatus, as disclosed in an example of the present invention. Fig. 4 This is a top view of a torsion wheel in one example disclosed in this invention; Among them: 1-calibration platform, 101-bearing, 102-rotating shaft, 103-cantilever, 104-rotation locking component, 105-support leg, 106-counterweight structure, 107-protruding structure, 2-torsion wheel, 3-rotation positioning mechanism, 4-torsion sensor, 401-indication display device, 402-data cable, 5-diameter changing mechanism, 6-steering wheel, 7-traction cable, 8-weight. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a calibration device and method for the torque sensor of an electrical vane shearing apparatus, in order to solve the problems existing in the prior art. With the calibration device and method for the torque sensor of an electrical vane shearing apparatus disclosed in this invention, the calibration of the torque sensor can be completed by oneself, which is convenient, fast, time-saving, economical and has significant benefits.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figs. 1 to 4 As shown, the present invention provides a calibration device for a torque sensor of an electrical cross-shaped shear tester, comprising a calibration platform 1, a rotation positioning mechanism 3, a torsional tension application mechanism, and a value display device 401; wherein, a rotating shaft 102 is rotatably mounted on the calibration platform 1, one end of the rotating shaft 102 is a connecting end, the connecting end extends out of the calibration platform 1, and is used to coaxially connect to one end of a torque sensor 4; the rotation positioning mechanism 3 is mounted on the calibration platform 1 and is used to fix it to the other end of the torque sensor 4; the torsional tension application mechanism is drivenly connected to the rotating shaft 102 and is used to apply a torsional tension that drives the rotating shaft 102 to rotate and varies in stages; the value display device 401 is used to be electrically connected to the torque sensor 4 and is used to display the torque value of the torque sensor 4. Among them, the torque sensor 4 is an electronic sensor device to be calibrated for measuring the torsional force of the rotating shaft 102. It is connected to the display device 401 via the data cable 402, and outputs electrical signals such as voltage. The torque value is displayed on the display device 401 in the form of electrical signals or directly interpreted and calculated torque values.

[0024] In the torque sensor calibration device for an electrical vane shearing apparatus disclosed in this invention, the two ends of the torque sensor 4 are connected to the rotating shaft 102 and the rotation positioning mechanism 3, respectively. The torque on the rotating shaft 102 is applied or removed by increasing or decreasing the torsional tension through the torsional tension application mechanism, and the torque in the opposite direction is applied through the rotation positioning mechanism 3, thereby obtaining the torque value of the torque sensor 4. The calibration coefficient of the torque sensor 4 is obtained using a graphical method or the least squares method based on the torque values ​​after different levels of loading and unloading. The entire electrical vane shearing apparatus torque sensor calibration device has a simple structure, is easy to operate, and convenient to apply. It can calibrate the torque sensor 4 of an electrical vane shearing apparatus, providing reliable data. This helps improve the testing accuracy and quality of the electrical vane shearing apparatus, increases testing efficiency and effectiveness, has a low technical threshold, low cost, high cost-effectiveness ratio, significant economic and comprehensive benefits, and is easy to promote and apply.

[0025] In this embodiment, the bottom of the calibration platform 1 is provided with multiple support legs 105 to provide stable support for the calibration platform 1, and a counterweight structure 106 is installed on each support leg 105 to prevent the entire calibration platform 1 from overturning when the torsional tension applied by the torsional tension application mechanism is too large. Preferably, the counterweight structure 106 is located at the bottom of the support leg 105.

[0026] In this embodiment, a circular recess is provided at the center of the calibration platform 1, in which a bearing 101 is embedded. The rotating shaft 102 is cylindrical, and its root is embedded in the bearing 101. The setting of the bearing 101 and the setting of the extension direction of the rotating shaft 102 are not limited. They can be set in the horizontal direction or in the vertical direction, etc. The setting of the rotating shaft 102 and the bearing 101 can also be set according to the actual placement position of the torque sensor 4. For example, if the torque sensor 4 needs to be placed in the vertical direction, then the axes of the bearing 101 and the rotating shaft 102 are set to extend in the vertical direction.

[0027] In one specific embodiment, the torsional tension application mechanism is equipped with a pulley assembly and a traction cable 7; the pulley assembly is synchronously connected to the rotating shaft 102; one end of the traction cable 7 is wound around the pulley assembly, and the other end is connected to the torsional tension application mechanism. By setting the pulley assembly and the traction cable 7, the rotating shaft 102 can drive the pulley assembly and the traction cable 7 to move synchronously when it rotates, and then connects to the torsional tension application mechanism through the traction cable 7, so that the setting position of the torsional tension application mechanism is not restricted.

[0028] In this embodiment, the traction cable 7 is a rope with a certain tensile strength that will not undergo tensile deformation, such as a steel wire rope with high tensile strength and resistance to tensile deformation. The pulley assembly includes multiple pulleys. One end of the traction cable 7 is wound around a pulley and connected to a hole on the outer edge of the pulley. The other end passes around other pulleys and is connected to the torsional tension application mechanism.

[0029] In one specific embodiment, the torsional tension application mechanism includes a weight pan and multiple weights 8; the weight pan is connected to the end of the traction cable 7 that is not wound around the pulley assembly, and each weight 8 is stacked on the weight pan in sequence. Combined with the pulley assembly, the end of the traction cable 7 can be suspended outside the calibration platform 1, thereby allowing the weight pan and weights 8 to be suspended; by using the weight pan and weights 8, relying on their own weight as the torsional tension application mechanism, its structure is simple, easy to use and low in cost.

[0030] In this embodiment, the weight pan is a circular disc with a vertical shaft at its center. The upper end of the shaft is shaped like a circular hole or a hook and is connected to the traction cable 7. The weight 8 is a disc-shaped device with a certain weight. There is a gap from the center to the edge of the weight 8, and the width of the gap is slightly larger than the diameter of the weight pan shaft. When applied, the weight 8 is placed on the weight pan, and the gap is engaged with the weight pan shaft. The weights are stacked one by one as needed to achieve stability and concentricity of the stacked weights 8.

[0031] In this embodiment, the bottom of the calibration platform 1 is provided with multiple support legs 105, and a counterweight structure 106 is installed on the support leg 105 on the opposite side of the weight pan to prevent the entire calibration platform 1 from tipping over when the torsional tension applied by the torsional tension application mechanism is too large.

[0032] As another implementation, the torsional tension application mechanism can also employ, but is not limited to, an electrically powered loading device, utilizing a servo motor or stepper motor to provide power, which is converted into linear motion to apply force through a transmission system. For example, a ball screw driven by a servo motor pulls the traction cable 7, and the torsional tension and displacement are measured by high-precision sensors and precisely controlled by a closed-loop control system.

[0033] In one specific embodiment, the pulley assembly includes a torsion wheel 2, which is coaxially sleeved on the rotating shaft 102 and rotates synchronously with the rotating shaft 102. One end of the traction cable 7 is wound around the torsion wheel 2, and the other end is connected to the torsion tension application mechanism. By setting the torsion wheel 2, the driving radius of the rotating shaft 102 is increased, thereby increasing the rotational torque of the rotating shaft 102.

[0034] In this embodiment, the diameter of the part of the rotating shaft 102 connected to the torsion wheel 2 is relatively small, and a groove is formed on the outer wall of this part. The torsion wheel 2 is a round wheel with a round hole at its center. The inner diameter of the round hole is slightly larger than the diameter of the section of the rotating shaft 102 connected to the torsion wheel 2. A protruding prism is provided on the inner wall of the round hole. The torsion wheel 2 passes through the round hole and is sleeved on the rotating shaft 102. The protruding prism on the inner wall of the round hole is embedded in the groove on the outer wall of the rotating shaft 102, so as to realize the torsion wheel 2 to drive the rotating shaft 102 to rotate.

[0035] In this embodiment, the outer edge of the torsion wheel 2 is grooved to facilitate the winding and positioning of the traction cable 7. A hole is provided on the outer edge of the torsion wheel 2, and a key is inserted into the hole to fix the traction cable 7 on the outer edge of the torsion wheel 2.

[0036] In this embodiment, the rotating shaft 102 extends vertically, and the pulley assembly also includes a steering wheel 6. The steering wheel 6 is rotatably mounted on the calibration platform 1. One end of the traction cable 7 is wound around the torsion wheel 2, and the other end passes over the steering wheel 6 and is connected to the torsion tension application mechanism. The steering wheel 6 is a fixed pulley. By setting the steering wheel 6, the traction direction of the traction cable 7 can be changed, thereby making the connection between the torsion tension application mechanism and the traction cable 7 not limited by the rotation direction of the torsion wheel 2. For example, the steering wheel 6 is located at the outer rim of the torsion wheel 2, and the rotation plane of the torsion wheel 2 is tangent to the outer rim of the steering wheel 6, so that one end of the traction cable 7 is wound around the torsion wheel 2, and the other end passes over the steering wheel 6, and can be in a suspended state, ensuring that the traction cable 7 remains horizontal between the outer rim of the torsion wheel 2 and the outer rim of the steering wheel 6. Preferably, the steering wheel 6 is installed at the edge of the calibration platform 1, and its outer rim protrudes from the calibration platform 1, so that the end of the traction cable 7 not connected to the torsion wheel 2 can be suspended outside the calibration platform 1.

[0037] The outer edge of the steering wheel 6 is grooved to facilitate the positioning of the traction cable 7 during the loading and traction displacement process.

[0038] In one specific embodiment, a rotation locking member 104 is movably mounted on the calibration platform 1 along the rotating shaft 102 in the radial direction. The rotating shaft 102 is provided with a protruding structure 107 protruding from its outer peripheral wall. The protruding structure 107 is used to engage with the rotation locking member 104 so that before the torsional tension application mechanism is connected to the traction cable 7, that is, before the torsional tension is applied, the engagement between the rotation locking member 104 and the protruding structure 107 is used to pre-limit the rotating shaft 102, so as to avoid applying torque to the torque sensor 4 before calibration, and ensure the accuracy of the calibration of the torque sensor 4.

[0039] It should be noted that the engagement between the rotation locking member 104 and the protruding structure 107, i.e., as... Figs. 1 to 3 The rotating locking member 104 abuts against one side of the protruding structure 107, which can restrict the rotation of the shaft 102 in the direction in which it receives the traction force from the traction cable 7, but does not restrict the rotation of the shaft 102 in the direction away from the traction force.

[0040] The rotating locking member 104 is movably mounted on the calibration table 1, and the protruding structure 107 on the rotating shaft 102 is preferably located near the calibration table 1, so as to facilitate the engagement between the rotating locking member 104 and the protruding structure 107.

[0041] In this embodiment, a groove is provided on the calibration platform 1 near the rotating shaft 102. The axis of the groove passes through the axis of the rotating shaft 102. The rotation locking member 104 is slidably installed in the groove. When the rotation locking member 104 is pushed toward the rotating shaft 102, it can engage with the protruding structure 107, thereby achieving rotational locking of the rotating shaft 102. Preferably, the rotation locking member 104 has a prismatic structure, with part of its structure embedded in the groove and part protruding out of the groove. The protruding structure 107 on the rotating shaft 102 has a prismatic structure that matches the structure of the rotation locking member 104, so that the rotation locking member 104 and the protruding structure 107 can be stably engaged after the rotation locking member 104 is pushed.

[0042] In one specific embodiment, the rotation positioning mechanism 3 includes a drive motor. The output end of the drive motor is coaxially connected to the end of the torque sensor 4 away from the rotating shaft 102. The drive motor is mounted on the calibration platform 1 via a bracket. The speed and angle of the drive motor are both controllable. It can be a stepper motor or a servo motor, which makes it easier to rotate the torque sensor 4 to the required angle.

[0043] In an embodiment where a rotation locking member 104 is movably mounted radially along the rotating shaft 102 on the calibration platform 1, and the rotating shaft 102 has a protruding structure 107 protruding from its outer peripheral wall, and in an embodiment where the torsional tension application mechanism uses a weight pan and weights 8, the rotating shaft 102 is pre-locked by the rotation locking member 104 so that it no longer rotates in the direction of the traction force of the weight pan and weights 8. Then, the torque sensor 4 and the rotating shaft 102 are driven by the drive motor to rotate a certain angle in the direction away from the traction force. At this time, the rotation locking member 104 disengages from the protruding structure 107, so that the rotating shaft 102 and the torque sensor 4 are once again subjected to the traction force of the weight pan and weights 8.

[0044] In this embodiment, the support includes a connecting column and a cantilever 103. The connecting column extends in the same direction as the rotating shaft 102, with one end mounted on the calibration platform 1 and the other end extending away from the calibration platform 1. One end of the cantilever 103 is connected to the connecting column, and the other end extends to the side of the torque sensor 4 away from the rotating shaft 102. The drive motor is mounted on the cantilever 103 near the torque sensor 4. The connecting column and cantilever 103 support the drive motor. When the torsional tension application mechanism uses a weight pan and weights 8, the column is mounted on the side opposite to the torsional tension application mechanism. This not only prevents interference with the position of the weight pan and weights 8 but also balances the center of gravity of the entire calibration platform 1, ensuring the stability of the entire calibration platform 1 during use.

[0045] In another embodiment, the rotation positioning mechanism 3 may also be a manually controllable rotation positioning mechanism. The rotation positioning mechanism is rotatably mounted on the cantilever 103 and coaxially arranged with the torque sensor 4, and connected to the end of the torque sensor 4. When the torque sensor 4 needs to be rotated into position, the rotation positioning mechanism is fixed on the cantilever 103 by positioning components such as set screws to maintain its positioning on the other end of the torque sensor 4.

[0046] In one specific embodiment, the two ends of the torque sensor 4 are respectively connected to the rotation positioning mechanism 3 and the rotating shaft 102 through the diameter changing mechanism 5. By setting the diameter changing mechanism 5 to match the connection structure with different diameters, the reliability of the connection between the rotation positioning mechanism 3 and the rotating shaft 102 and the torque sensor 4 is ensured.

[0047] Furthermore, a calibration method is also provided, including the following steps: S1. Adjust the calibration stage 1 to be stable to ensure stability when calibrating the torque sensor 4; S2. Connect the torsional tension application mechanism to the rotating shaft 102 for transmission, so as to apply or remove torsional tension on the rotating shaft 102 step by step; S3. Coaxially mount one end of the torque sensor 4 onto the rotating shaft 102, and mount the rotation positioning mechanism 3 onto the other end of the torque sensor 4. Fix the torque sensor 4 by rotating it at a certain angle or fix it by rotating it. S4. Connect the torque sensor 4 and the display device 401 electrically, and start the display device 401. The displayed data of the display device 401 is the torque value. S5. Zero the display device 401 to avoid the impact of subsequent increases or decreases in torsional tension on calibration accuracy. S6. Torsional tension is applied to the rotating shaft 102 and torque sensor 4 in stages through the torsional tension application mechanism, and a corresponding torsional force in the opposite direction is applied to the torque sensor 4 through the rotation positioning mechanism 3, so that the torque sensor 4 is in a stationary state; the torque value of the display device 401 after each stage of torsional tension is applied and stabilized is recorded. S7. Apply the maximum load to the torque sensor 4 through the torsional tension application mechanism, and record the torque value. Then, in the reverse order, gradually remove the torsional tension and record the torque value after removing the torsional tension until all the torsional tension is removed and the torque value after the load is removed is recorded. S8. Repeat steps S5 to S7 at least 3 times. Each time, the torsional tension applied to the rotating shaft 102 and the torque sensor 4 by the torsional tension application mechanism is consistent. Each time, the corresponding opposite torsional force applied to the torque sensor 4 by the rotation positioning mechanism is consistent. The calibration ends. It should be noted that the arithmetic mean of the same level of load is taken as the torque value of the sensor during calculation. S9. According to the formula FR=KM, the calibration coefficient of torque sensor 4 is obtained by graphical method or least squares method; Where F is the torsional tension; R is the vertical distance between the point of application of the torsional tension application mechanism and the axis of the rotating shaft 102; K is the calibration coefficient of the torque sensor; and M is the torque value.

[0048] Furthermore, based on the above implementation method, in a specific practical example: The rotating shaft 102 extends vertically, with its bottom end rotatably mounted on the calibration platform 1. The top end is coaxially connected to the torque sensor 4, and the top end of the torque sensor 4 is coaxially connected to the output end of the drive motor. A torsion wheel 2 is sleeved on the rotating shaft 102. A steering wheel 6 with its axis extending horizontally is provided on the calibration platform 1. One end of the traction cable 7 is wound around the torsion wheel 2, and the other end passes around the steering wheel 6 to suspend the weight pan and the weight 8. A rotating locking part 104 is movably provided on the calibration platform 1 and can engage with the protruding structure 107 on the rotating shaft 102. The torque sensor 4 is electrically connected to the value display device 401.

[0049] In this practical example, in step S1, when the calibration platform 1 is adjusted to be stable, the counterweight structure 106 is assembled on the support leg 105 on the side opposite to the weight pan and the weight 8, and the power supply of the drive motor is turned on. In this practical example, in step S2, one end of the traction cable 7 is fixed to the hole on the outer edge of the torsion wheel 2 by an adapter pin, and the other end passes through the steering wheel 6, so that it is in a natural suspension state outside the calibration platform 1; the rotation locking member 104 is pushed towards the rotating shaft 102, so that the rotating shaft 102 and the torsion wheel 2 are torsionally locked in the traction torsion direction of the traction cable 7. In this practical example, in step S3, the variable diameter mechanism 5 is used to connect one end of the torque sensor 4 to be calibrated to the torsion output shaft of the drive motor and the other end to the rotating shaft 102, and to ensure that the axes of the torsion output shaft of the drive motor, the torque sensor 4, and the rotating shaft 102 are collinear. In this practical example, before step S5, the weight pan is connected to the lower end of the traction cable 7, and a light weight 8 is applied to the weight pan. In this practical operation example, in step S6, the drive motor is started and slowly twisted to the required angle in the opposite direction of the traction twisting direction of the traction cable 7, so that the rotation locking member 104 is disengaged from the protruding mechanism protruding from the lower outer wall of the rotating shaft 102. After stabilization, the display value on the display device 401 is measured and recorded. In this practical example, the drive motor rotates the torque sensor 4 in the opposite direction by about 1°, causing the rotation locking member 104 to disengage from the protruding mechanism protruding from the lower outer wall of the rotating shaft 102 by about 10mm.

[0050] In this practical example, in step S6, the weights 8 are added step by step to increase the torsional tension step by step, and the corresponding torsional force in the opposite direction is applied by the drive motor so that the rotation locking part 104 and the protruding mechanism protruding from the lower outer wall of the rotating shaft 102 are always kept at a distance, and the display value after the stability after each weight 8 is applied is measured and recorded. In this practical operation example, in step S7, after applying the maximum load and recording the displayed value, the weights 8 are removed step by step in the reverse order, and the displayed value after removing the weights 8 is recorded, until all the weights 8 and the weight pan are removed, and the displayed value after the load is removed is recorded. In this practical example, in step S9, the calibration coefficient of the torque sensor 4 is obtained by graphical method or least squares method according to the formula FR=KM; where F is the torsional tension; R is the vertical distance between the force application point of the torsional tension application mechanism and the axis of rotation; K is the calibration coefficient of the torque sensor 4; and M is the torque value. In this practical example, it should be noted that F=mg, m is the mass of the weight, and g is the acceleration due to gravity. In this practical example, in the formula FR=KM, R is actually the radius of the torsion wheel, which is the vertical distance between the point of application of the torsional tension mechanism and the axis of rotation, and M is actually the indicated data, which is the torque value.

[0051] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0052] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A calibration device for the torque sensor of an electrical measuring vane shear tester, characterized in that, include: A calibration stage is rotatably mounted with a rotating shaft, one end of which is a connecting end that extends out of the calibration stage and is used for coaxial connection to one end of a torque sensor. A rotation positioning mechanism is mounted on the calibration platform and used to fix the other end of the torque sensor; A torsional tension application mechanism is connected to the rotating shaft and is used to apply a torsional tension that drives the rotating shaft to rotate and varies in stages. A value display device is used to be electrically connected to the torque sensor and to display the torque value of the torque sensor.

2. The torque sensor calibration device for an electrical measuring vane shearing apparatus according to claim 1, characterized in that, The torsional tension application mechanism is equipped with: A pulley assembly that is synchronously connected to the rotating shaft; The traction cable has one end wound around the pulley assembly and the other end connected to the torsional tension application mechanism.

3. The torque sensor calibration device for an electrical measuring vane shearing apparatus according to claim 2, characterized in that, The torsional tension application mechanism includes: A weight pan is connected to the end of the traction cable that is not wound around the pulley assembly; Multiple weights are stacked sequentially on the weight pan.

4. The torque sensor calibration device for an electrical measuring vane shearing apparatus according to claim 2, characterized in that, The pulley assembly includes: A torsion wheel is coaxially sleeved on the rotating shaft and rotates synchronously with the rotating shaft. One end of the traction cable is wound around the torsion wheel, and the other end is connected to the torsion tension application mechanism.

5. The torque sensor calibration device for an electrical measuring vane shearing apparatus according to claim 4, characterized in that, The pulley assembly also includes: A steering wheel is rotatably mounted on the calibration platform. One end of the traction cable is wound around the torsion wheel, and the other end passes around the steering wheel and is connected to the torsion tension application mechanism.

6. The torque sensor calibration device for an electrical measuring vane shearing apparatus according to claim 1, characterized in that, A rotation locking component is movably mounted on the calibration platform along the radial direction of the rotating shaft. The rotating shaft is provided with a protruding structure protruding from its outer peripheral wall, which is used to engage with the rotation locking component.

7. The torque sensor calibration device for an electrical measuring vane shear apparatus according to claim 1, characterized in that, The rotation positioning mechanism includes: A drive motor is coaxially connected to the end of the torque sensor opposite to the rotating shaft, and the drive motor is mounted on the calibration platform via a bracket.

8. The torque sensor calibration device for an electrical measuring vane shearing apparatus according to claim 7, characterized in that, The support includes: A connecting post extends in the same direction as the rotating shaft, with one end of the connecting post mounted on the calibration platform and the other end extending toward the side away from the calibration platform. A cantilever arm, one end of which is connected to the connecting column, and the other end of which extends to the side of the torque sensor away from the rotating shaft, and the drive motor is mounted on the cantilever arm near the torque sensor.

9. The torque sensor calibration device for an electrical measuring vane shearing apparatus according to claim 1, characterized in that, The two ends of the torque sensor are connected to the rotation positioning mechanism and the rotating shaft respectively through a diameter-changing mechanism.

10. A calibration method for a torque sensor calibration device for an electrical measuring vane shear apparatus as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Adjust the calibration platform to a stable position; S2. Connect the torsional tension application mechanism to the rotating shaft drive; S3. Coaxially mount one end of the torque sensor on the rotating shaft, and mount the rotation positioning mechanism on the other end of the torque sensor; S4. Connect the torque sensor and the display device electrically, and start the display device; S5. Zero the indicated value display device; S6. Apply torsional tension to the rotating shaft and the torque sensor step by step through the torsional tension application mechanism, and apply a corresponding torsional force in the opposite direction to the torque sensor through the rotation positioning mechanism, so that the torque sensor is in a stationary state; record the torque value of the display device after each level of torsional tension is applied and stabilized; S7. Apply the maximum torsional load to the torque sensor through the torsional tension application mechanism, and record the torque value. Then, in reverse order, gradually remove the torsional tension and record the torque value after removing the torsional tension until the torsional tension is completely removed and the torque value after the load is removed is recorded. S8. Repeat steps S5 to S7 at least 3 times, wherein the torsional tension applied to the rotating shaft and the torque sensor by the torsional tension application mechanism is consistent each time, and the torsional force applied to the torque sensor by the rotation positioning mechanism in the opposite direction is consistent each time, and the calibration ends. S9. According to the formula FR=KM, the calibration coefficient of the torque sensor is obtained by graphical method or least squares method; Where F is the torsional tension; R is the vertical distance between the point of application of the torsional tension and the axis of rotation; K is the calibration coefficient of the torque sensor; and M is the torque value.

Images