Positioning method and positioning tool for coaxiality of viscometer rotor and crucible
By using a suspension rope to suspend the rotor and the central groove of the crucible lid, combined with a mechanical positioning device, the problem of coaxial adjustment between the rotor and the crucible in viscosity measurement was solved, improving measurement accuracy and experimental consistency, and shortening experimental preparation time.
Patent Information
- Application Number
- CN202511761200.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-02-24
AI Technical Summary
In traditional viscosity measuring devices, the coaxiality of the rotor and crucible depends on manual adjustment, resulting in large measurement errors, low repeatability, and difficulty in meeting the requirements for experimental consistency.
The rotor is suspended by a rope and physically guided by the central groove of the crucible lid. It is equipped with a mechanical positioning device to achieve automatic coaxial alignment of the rotor and crucible. The consistency of positioning is ensured by the moving coordinate calibration function.
It significantly reduces the errors and tediousness caused by manual adjustment, improves the adjustment efficiency and repeatability of experimental results in multiple experiments, and shortens the experimental preparation time.
Smart Images

Figure CN121552269A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of high-temperature viscosity measurement of glass, and in particular to a method and positioning fixture for coaxial positioning of a viscometer rotor and a crucible. Background Technology
[0002] In the field of high-temperature viscosity measurement of glass, traditional viscosity measuring devices (such as rotary viscometers) rely on manually adjusting the alignment of the rotor and crucible axes. This is prone to measurement errors due to operational deviations. The coaxiality of the rotor and crucible directly affects the measurement accuracy. Misalignment of the axes leads to uneven gaps between the rotor and crucible, which in turn causes fluid boundary effects, resulting in deviations in torque calculation. Moreover, manual positioning methods have low repeatability, lack standardized positioning mechanisms, and result in poor comparability of experimental data, making it difficult to meet experimental consistency requirements.
[0003] Therefore, there is an urgent need for a technical solution that can standardize the adjustment of the coaxiality of the rotor and crucible, reduce boundary effects, make viscosity test results more accurate, solve the problem of operational consistency, and ensure that the coaxiality of the rotor and crucible is consistent every time. Summary of the Invention
[0004] The purpose of this invention is to solve the above-mentioned technical problems and provide a method and fixture for coaxial positioning of a viscometer rotor and crucible. This method can effectively eliminate the errors and cumbersome adjustments caused by manual adjustment and solve the problems of axial offset, poor stability and low operational consistency caused by manual adjustment of coaxiality in viscosity measurement.
[0005] To achieve the above objectives, the present invention provides the following solution: The present invention discloses a method for coaxial positioning of a viscometer rotor and a crucible, comprising the following steps: The rotor is suspended from the rotating rod of the viscometer head using a rope; A crucible lid with a central groove is placed over the crucible opening, the radius of which matches the maximum radius of the rotor end. Place the crucible on the platform of the viscometer base, move the crucible to adjust the relative position of the central groove and the end of the rotor in the horizontal direction, lower the rotating rod through the lifting mechanism of the machine head, and lower the rotor. During the lowering process, move the crucible to adjust the position of the central groove until the maximum diameter of the end of the rotor passes through the groove opening of the central groove and stop lowering. The viscosity measurement test can be performed by replacing the suspension rope with a hook specifically designed for the viscometer and removing the crucible lid.
[0006] Preferably, the method further includes the following steps: setting a moving device with a moving coordinate calibration function on the base, the moving terminal of the moving device is equipped with a clamp, moving the moving terminal of the moving device to clamp the clamp on the crucible, and recording the corresponding coordinate value of the moving terminal of the moving device at this time as a standard value; According to the standard value, the mobile terminal of the mobile device is used to clamp and move the next crucible.
[0007] Preferably, the lowering progress of the rotor is adjusted according to the adjustment progress of the position of the central slot.
[0008] The present invention also discloses a coaxial positioning fixture for a viscometer rotor and a crucible, comprising a suspension rope and a crucible cover with a central groove. The suspension rope is used to suspend the rotor of the viscometer on the rotating rod of the viscometer head. The crucible cover is used to cover the crucible opening. The central groove is for the end of the rotor to extend into, and the groove radius is matched with the maximum radius of the end of the rotor.
[0009] Preferably, it further includes a moving device with a moving coordinate calibration function, the moving device being mounted on the base of the viscometer, and the moving terminal of the moving device being provided with a clamp for holding the crucible.
[0010] Preferably, the rotor has a tapered end and the central groove is a conical groove that matches the tapered end.
[0011] Preferably, the error between the maximum radius of the rotor end and the radius of the central slot is ≤0.1mm.
[0012] Preferably, the planar moving mechanism includes an x-axis linear guide and a y-axis linear guide. The x-axis linear guide is mounted on the base of the viscometer, the y-axis linear guide is mounted on the x-axis sliding block of the x-axis linear guide, and the clamp is mounted on the y-axis sliding block of the y-axis linear guide.
[0013] Preferably, both the x-direction linear guide and the y-direction linear guide are provided with scale values.
[0014] Preferably, the planar moving mechanism includes a driving mechanism, which includes an x-axis driving component and a y-axis driving component. The x-axis driving component includes an x-axis screw and an x-axis driving motor. The x-axis driving motor is mounted on the x-axis linear guide rail. The x-axis screw is threadedly connected to the x-axis moving slider and is connected to the motor shaft of the x-axis driving motor. The y-axis driving component includes a y-axis screw and a y-axis driving motor. The y-axis driving motor is mounted on the y-axis linear guide rail. The y-axis screw is threadedly connected to the y-axis moving slider and is connected to the motor shaft of the y-axis driving motor.
[0015] The present invention achieves the following technical effects compared to the prior art: In this invention, the rotor is suspended by a rope, and gravity is used to maintain the rotor's suspension during descent. In conjunction with the central groove of the crucible lid, as long as the rotor can smoothly pass through the central groove when adjusting the crucible position, the coaxiality of the crucible and rotor can be guaranteed. By using physical properties for guidance, the errors and cumbersome adjustments caused by manual adjustment can be effectively eliminated. This solves the problems of axial offset, poor stability, and low operational consistency caused by manual adjustment of coaxiality in viscosity measurement.
[0016] Other technical solutions of the present invention have achieved the following technical effects compared with the prior art: In this invention, by adding a mechanical positioning device (a moving device with a moving coordinate calibration function) and coordinating with physical property guidance, the problems of axial offset, poor stability and low operational consistency caused by manually adjusting coaxiality in viscosity measurement are solved. Moreover, the adjustment efficiency of multiple tests is significantly improved, thereby increasing the overall test time. Attached Figure Description
[0017] 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 by analyzing these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram illustrating the process of positioning the first crucible using a positioning fixture that is coaxial with the viscometer rotor in an embodiment of the present invention. Figure 2 This is a schematic diagram illustrating the coaxial positioning principle of the rotor's conical head and the crucible lid's central groove in an embodiment of the present invention. Figure 3 This is a schematic diagram of the process of measuring the high-temperature viscosity of a crucible using a positioning fixture with a coaxiality between the viscometer rotor and the crucible in an embodiment of the present invention. Figure 4This is a schematic diagram of the structure of the mobile device in an embodiment of the present invention.
[0019] Explanation of reference numerals in the attached drawings: 1. Machine head; 2. Lifting rope; 3. Rotor; 4. Crucible; 5. End; 6. Crucible cover; 7. Central groove; 8. Platform; 9. Moving device; 10. Clamp; 11. X-axis linear guide; 12. Y-axis linear guide; 13. X-axis moving slider; 14. Y-axis moving slider; 15. Furnace frame; 16. Heating furnace; 17. Rotating rod; 18. Lifting mechanism; 19. Base; 20. Hook. 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 analyzed and 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 method and fixture for coaxial positioning of a viscometer rotor and crucible, in order to solve the problems existing in the prior art. It designs a combination of physical property guidance (using gravity to suspend the rotor and the center groove of the crucible cover) and mechanical positioning device (a moving device with a moving coordinate calibration function), which solves the problems of axial offset, poor stability and low operation consistency caused by manually adjusting coaxiality in viscosity measurement. Moreover, it significantly improves the adjustment efficiency of multiple tests, thereby increasing the overall test time.
[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] Example 1 like Figures 1 to 4 As shown, this embodiment provides a method for coaxial positioning of a viscometer rotor and a crucible, including the following steps: The rotor 3 is suspended from the rotating rod 17 of the viscometer head 1 by the suspension rope 2. Guided by the gravity of the rotor 3, the rotor 3 will automatically maintain a vertical state as it is driven to descend by the rotating rod 17 of the head 1. A crucible lid 6 is placed over the crucible opening of crucible 4. The center of the crucible lid 6 has a central groove 7. The radius of the groove 7 matches the maximum radius of the end 5 of rotor 3. This matching is allowed to have a certain error, that is, the difference between the radius of the groove 7 and the maximum radius of the end 5 of rotor 3 is not greater than 0.1mm, so as to ensure the coaxiality of rotor 3 and central groove 7 as much as possible. Place the crucible 4 on the stage 8 of the viscometer, move the crucible 4 to adjust the relative position of the central groove 7 and the end 5 of the rotor 3 in the horizontal direction, drive the rotating rod 17 to move down through the lifting mechanism 18 of the machine head 1, and lower the rotor 3. During the lowering of the rotor 3, continue to move the crucible 4 to adjust the position of the central groove 7 until the end 5 of the rotor 3 passes through the groove opening of the central groove 7 and stop lowering. At this time, the coaxial positioning of the crucible 4 and the rotor 3 is completed. Replace the suspension rope 2 with the hook 20 for the viscometer. That is, remove the rotor 3 and the suspension rope 2, and use the hook 20 to connect the rotor 3 and the rotating rod 17 of the head 1. Remove the crucible cover 6 and you can then carry out the subsequent viscosity measurement test.
[0024] This positioning method utilizes gravity to suspend the rotor 3, ensuring its suspension during descent. This, combined with the central groove 7 of the crucible lid 6, allows the crucible 4 to be aligned with the rotor 3 once it passes smoothly through the central groove 7. This ensures the coaxiality of the crucible 4 and the rotor 3. By using physical properties for guidance, this method effectively eliminates errors and the cumbersome nature of manual adjustment.
[0025] Note: The head 1, rotating rod 17 and lifting mechanism 18 are all mechanisms of the viscometer itself. The viscometer is an existing equipment purchased, so its working principle and functional structure will not be described in detail.
[0026] In one embodiment, to further ensure the consistency of multiple adjustments and shorten subsequent adjustment time, this method introduces a cooperative design of the mechanical positioning device, specifically including the following steps: A moving device 9 is set on the base 19. The moving device 9 has a moving coordinate calibration function. The moving terminal of the moving device 9 is equipped with a clamp 10. The moving terminal of the moving device 9 clamps the clamp 10 on the crucible 4. The coordinate value of the moving terminal of the moving device 9 at this time is recorded as the standard value. Based on this standard value, the clamp 10 of the mobile terminal of the moving device 9 is used to hold and move the next crucible 4. That is, each crucible 4 thereafter is held by the clamp 10 of the mobile terminal of the moving device 9, and then moved to the standard value position by the driving force of the mobile terminal. In this way, the position of each crucible 4 is the same as that of the first standard position, thereby ensuring that the coaxiality of each crucible 4 and the rotor 3 is consistent. There is no need to repeatedly use the suspension rope 2 for coaxiality adjustment and positioning, effectively shortening the subsequent adjustment time.
[0027] This positioning method, by adding a mechanical positioning device (moving device 9 with moving coordinate calibration function) and coordinating with physical property guidance (the suspension rope 2 uses gravity to suspend the rotor 3 and the center groove 7 of the crucible cover 6), solves the problems of axial offset, poor stability and low operation consistency caused by manually adjusting coaxiality in viscosity measurement. Moreover, it significantly improves the adjustment efficiency of multiple tests, thereby increasing the overall test time.
[0028] In one embodiment, the method further includes the following steps: adjusting the lowering progress of the rotor 3 according to the adjustment progress of the position of the central groove 7, that is, adjusting the lowering speed of the rotor 3 and the start and stop of the lowering process according to the adjustment of the position of the central groove 7. For example: after placing the crucible 4 on the stage 8 of the base 19, the rotor 3 is not lowered at first. The crucible 4 is initially moved to adjust the position of the central groove 7 so that the central groove 7 and the rotor 3 are visually coaxial. Then the rotor 3 is lowered. When the rotor 3 is lowered to near the top of the central groove 7, the rotor 3 can be paused. Then, based on the visual inspection, it is determined whether the rotor 3 can pass smoothly through the central groove 7. If it can, the rotor 3 is lowered again. If it cannot, the position of the crucible 4 is adjusted and the rotor 3 is lowered again. This step can be repeated. By continuously lowering and stopping the rotor 3 and adjusting the crucible 4, the maximum diameter of the end 5 of the rotor 3 can be smoothly passed through the groove opening of the central groove 7.
[0029] In one embodiment, the high-temperature viscosity measurement test procedure is as follows: First, the operator uses the suspension rope 2, crucible lid 6 and moving device 9 to locate the position of crucible 4 at room temperature to obtain the standard coordinate value. Then, the operator uses the hook 20 to connect the rotor 3 and the rotating rod 17 of the machine head 1 and removes the crucible lid 6. At this time, the platform 8 adopts a lifting platform, which can drive the crucible 4 to rise and fall. In the second step, the clamp 10 releases the crucible 4, and the moving terminal of the moving device 9 carries the clamp 10 away. The platform 8 rises, allowing the crucible 4 to enter the heating furnace 16 from the bottom furnace opening. The heating furnace 16 is then started and heated to the preset temperature. This causes the rotating rod 17 of the test head 1 to descend, allowing the rotor 3 to enter from the top furnace opening of the heating furnace 16 and then immerse itself in the liquid to be tested (such as molten glass) in the crucible 4. The rotating mechanism built into the test head 1 is then activated, which drives the rotor 3 to rotate and detect the viscosity of the liquid to be tested (such as molten glass). After measurement, the rotating rod 17 rises and returns to its original position. Because the temperature of the heating furnace 16 is not lower than 1600℃, the rotor 3 is preferably a platinum rotor.
[0030] In the third step, the stage 8 is lowered so that the crucible 4 is removed from the heating furnace 16. The moving terminal of the moving device 9, carrying the clamp 10, takes away the crucible 4 after the measurement is completed. A new crucible 4 is clamped on the clamp 10. Using the moving terminal of the moving device 9, the crucible 4 is sent to the standard coordinate value position. Then the steps of the second step are repeated to complete the viscosity measurement of the new crucible 4.
[0031] Since only the first crucible 4 requires the suspension rope 2 and crucible lid 6 for positioning, subsequent positioning of crucible 4 can be quickly completed with the moving device 9, achieving repeatability of tests between different experiments. Once positioned by the moving device 9, subsequent alignment can be automatically achieved, reducing the experimental preparation time from the traditional 15 minutes to 2 minutes. After 10 consecutive experiments in a high-temperature environment (700℃), the standard deviation of position repeatability was found to be ≤0.02mm (compared to ±1.5mm for traditional manual placement).
[0032] Example 2 like Figures 1 to 4 As shown, this embodiment provides a coaxial positioning fixture for a viscometer rotor and a crucible, which can be used in the coaxial positioning method for a viscometer rotor and a crucible in Embodiment 1. It includes a suspension rope 2 and a crucible cover 6. The suspension rope 2 is used to suspend the viscometer rotor 3 on the rotating rod 17 of the viscometer head 1. The crucible cover 6 has a central groove 7, which is coaxial with the crucible cover 6. Therefore, after the crucible cover 6 is placed on the crucible opening of the crucible 4, the central groove 7 will be coaxial with the crucible cover 6. The central groove 7 allows the end 5 of the rotor 3 to extend into it. The radius of the groove opening of the central groove 7 matches the maximum radius of the end 5 of the rotor 3, thereby ensuring that after the end 5 of the rotor 3 passes through the opening of the central groove 7, the rotor 3 and the central groove 7 achieve ideal coaxiality, that is, ensuring the coaxiality of the rotor 3 and the crucible 4. The working principle is the same as the coaxial positioning method for a viscometer rotor and a crucible in Embodiment 1.
[0033] In one embodiment, a moving device 9 with a moving coordinate is also included. The moving device 9 is used to be set (including placed and installed) on the base 19 of the viscometer, and the moving terminal of the moving device 9 is provided with a clamp 10 for holding the crucible 4.
[0034] In one embodiment, the end 5 of the rotor 3 is a conical head. The central groove 7 is a conical groove used to match the conical head. Of course, the central groove 7 can also be a circular groove.
[0035] In one embodiment, the error between the maximum radius of the end 5 of the rotor 3 and the groove radius of the center slot 7 is ≤0.1mm. That is, the difference between the groove radius of the center slot 7 and the maximum radius of the end 5 of the rotor 3 is ≤0.1mm.
[0036] In one embodiment, the mobile device 9 may be a manually driven mobile device or an automated mobile device, such as a planar moving mechanism or a multi-axis robotic arm.
[0037] In one embodiment, the clamp 10 may be a manually driven clamp or other clamp, or an automated gripper, mechanical claw or gripper.
[0038] In one embodiment, the planar moving mechanism includes an x-axis linear guide 11 and a y-axis linear guide 12. The x-axis linear guide 11 is horizontally mounted on the base 19 of the viscometer, and the y-axis linear guide 12 is horizontally mounted on the x-axis sliding block 13 of the x-axis linear guide 11. The clamp 10 is mounted on the y-axis sliding block 14 of the y-axis linear guide 12. By driving the x-axis sliding block 13, the clamp 10 can move along the width direction of the stage 8. By driving the y-axis sliding block 14, the clamp 10 can move along the length direction of the stage 8, thereby enabling the clamp 10 to adjust its position and grip the crucible 4.
[0039] In one embodiment, both the x-axis linear guide 11 and the y-axis linear guide 12 are provided with scale values. Coordinate calibration is achieved through these scale values. The x-axis slider 13 and the y-axis slider 14 can be manually driven, i.e., their positions can be manually adjusted, or a drive mechanism can be used to drive them for automated operation. If automated operation is used, coordinate calibration relies on the drive mechanism's own coordinate positioning module. The scale values are only for operator reference or correction. If manual operation is used, it is recommended to install locking screws on the x-axis slider 13 and the y-axis slider 14. Tightening the locking screws will lock the x-axis slider 13 onto the x-axis linear guide 11 and the y-axis slider 14 onto the y-axis linear guide 12.
[0040] In one embodiment, the planar movement mechanism includes a drive mechanism, which comprises an x-axis drive assembly and a y-axis drive assembly. The x-axis drive assembly includes an x-axis screw and an x-axis drive motor. The x-axis drive motor is mounted on an x-axis linear guide rail 11. The x-axis screw is threadedly connected to the x-axis movable slider 13 and to the motor shaft of the x-axis drive motor. The y-axis drive assembly includes a y-axis screw and a y-axis drive motor. The y-axis drive motor is mounted on a y-axis linear guide rail 12. The y-axis screw is threadedly connected to the y-axis movable slider 14 and to the motor shaft of the y-axis drive motor. By driving the x-axis and y-axis drive motors, the positions of the x-axis movable slider 13 and the y-axis movable slider 14 can be automatically adjusted.
[0041] In one embodiment, the x-axis drive motor and the y-axis drive motor are equipped with an angle encoder and a motor controller. By knowing and controlling the rotation angle of the motor shafts of the x-axis drive motor and the y-axis drive motor, the position control of the x-axis moving slider 13 and the y-axis moving slider 14 can be realized.
[0042] In one embodiment, grating rulers can also be installed on the x-direction linear guide 11 and the y-direction linear guide 12, and the grating rulers can be electrically connected to the angle encoder and the motor controller to realize the position control and monitoring of the x-direction moving slider 13 and the y-direction moving slider 14.
[0043] In one embodiment, a PLC controller is also included. The PLC controller is electrically connected to the angle encoder, motor controller, linear encoder, and clamp 10. The PLC controller is equipped with control buttons and a control screen. Orientation buttons and gripping buttons are provided on the control buttons and / or the control screen. The orientation buttons control the movement of the x-axis slider 13 and the y-axis slider 14, while the gripping buttons control the opening and closing of the clamp 10. The control screen also has a control parameter input module. Position parameters are input via the control buttons and / or the control screen, and subsequent opening and closing of the clamp 10 will be automatically controlled by software. The first crucible 4 can be manually operated to obtain its coordinate values as a standard value, and then these coordinate values are input to the control parameter input module to achieve automatic positioning of subsequent crucibles 4. The control buttons and control screen also include pause buttons, start buttons, etc., which will not be detailed here; refer to existing technologies.
[0044] 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 method for coaxial positioning of a viscometer rotor and a crucible, characterized in that, Includes the following steps: The rotor is suspended from the rotating rod of the viscometer head using a rope; A crucible lid with a central groove is placed over the crucible opening, the radius of which matches the maximum radius of the rotor end. Place the crucible on the platform of the viscometer base, move the crucible to adjust the relative position of the central groove and the end of the rotor in the horizontal direction, lower the rotating rod through the lifting mechanism of the machine head, and lower the rotor. During the lowering process, move the crucible to adjust the position of the central groove until the maximum diameter of the end of the rotor passes through the groove opening of the central groove and stop lowering. The viscosity measurement test can be performed by replacing the suspension rope with a hook specifically designed for the viscometer and removing the crucible lid.
2. The method for coaxial positioning of the viscometer rotor and crucible according to claim 1, characterized in that, It also includes the following steps: A mobile device with a moving coordinate calibration function is set on the base. The mobile terminal of the mobile device is equipped with a clamp. The mobile terminal of the mobile device is moved to clamp the clamp on the crucible. The coordinate value of the mobile terminal of the mobile device at this time is recorded as a standard value. According to the standard value, the mobile terminal of the mobile device is used to clamp and move the next crucible.
3. The method for coaxial positioning of the viscometer rotor and crucible according to claim 1 or 2, characterized in that, The lowering progress of the rotor is adjusted according to the adjustment progress of the center slot position.
4. A viscometer rotor and crucible coaxial positioning fixture, characterized in that, The device includes a suspension rope and a crucible lid with a central groove. The suspension rope is used to suspend the rotor of the viscometer from the rotating rod of the viscometer head. The crucible lid is used to cover the crucible opening. The central groove is for the end of the rotor to extend into, and the radius of the central groove matches the maximum radius of the end of the rotor.
5. The viscometer rotor and crucible coaxial positioning fixture according to claim 4, characterized in that, It also includes a moving device with a moving coordinate calibration function, the moving device being mounted on the base of the viscometer, and the moving terminal of the moving device being provided with a clamp for holding the crucible.
6. The viscometer rotor and crucible coaxial positioning fixture according to claim 5, characterized in that, The rotor has a tapered end and a central groove that matches the tapered end.
7. The viscometer rotor and crucible coaxial positioning fixture according to claim 4 or 6, characterized in that, The error between the maximum radius of the rotor end and the radius of the central slot is ≤0.1mm.
8. The viscometer rotor and crucible coaxial positioning fixture according to claim 5, characterized in that, The planar moving mechanism includes an x-axis linear guide and a y-axis linear guide. The x-axis linear guide is mounted on the base of the viscometer, and the y-axis linear guide is mounted on the x-axis sliding block of the x-axis linear guide. The clamp is mounted on the y-axis sliding block of the y-axis linear guide.
9. The viscometer rotor and crucible coaxial positioning fixture according to claim 8, characterized in that, Both the x-axis linear guide and the y-axis linear guide are provided with scale values.
10. The viscometer rotor and crucible coaxial positioning fixture according to claim 9, characterized in that, The planar movement mechanism includes a drive mechanism, which comprises an x-axis drive assembly and a y-axis drive assembly. The x-axis drive assembly includes an x-axis screw and an x-axis drive motor. The x-axis drive motor is mounted on the x-axis linear guide rail. The x-axis screw is threadedly connected to the x-axis movable slider and is connected to the motor shaft of the x-axis drive motor. The y-axis drive assembly includes a y-axis screw and a y-axis drive motor. The y-axis drive motor is mounted on the y-axis linear guide rail. The y-axis screw is threadedly connected to the y-axis movable slider and is connected to the motor shaft of the y-axis drive motor.