Probe anti-rotation axial adjustment structure for strong magnetic field vacuum environment

Abstract

The present application relates to the technical field of magnetic confinement nuclear fusion plasma diagnostic equipment, and specifically discloses a probe anti-rotation axial adjustment structure for a strong magnetic field vacuum environment, which comprises a probe shaft base, a probe shaft nut arranged on the left side of the probe shaft base, and a probe shaft sleeve arranged on the left side of the probe shaft nut. By using pure mechanical components, without carrying any electronic components, the probe anti-rotation axial adjustment structure can be stably operated in a strong magnetic field with a strength of several teslas and a high vacuum environment for a long time, without failure caused by electromagnetic interference, and is suitable for the extreme operating conditions of a tokamak device. The differential screw transmission cooperates with a circumferential guide limiting structure, which can completely convert the rotary input into pure axial translational output, completely offset the circumferential parasitic torque generated in the screw transmission process, ensure that the detection angle of the probe remains constant during the entire adjustment process, effectively avoid the deviation of diagnostic data caused by angle deviation, and improve the accuracy of the measurement results of fusion physics experiments.

Description

Technical Field

[0001] This invention relates to the field of diagnostic equipment technology for magnetic confinement nuclear fusion plasma, specifically to a probe anti-rotation axial adjustment structure for use in a strong magnetic field vacuum environment. Background Technology

[0002] In magnetic confinement fusion experimental devices such as tokamaks, various diagnostic probes are core components for acquiring plasma parameters. The detection unit at the tip of the probe needs to extend into the vacuum chamber, and the detection angle must maintain a strict geometric correspondence with the magnetic field lines and plasma configuration within the device; otherwise, it will directly lead to deviations in the measurement data, affecting the accuracy of the physical experimental results. Under different experimental conditions, continuous high-precision axial adjustment of the probe's insertion depth into the vacuum chamber is required to obtain plasma parameters at different radial positions. Because the probe's working environment involves a strong magnetic field on the order of several Tesla, and is in a high vacuum state, conventional electric adjustment mechanisms equipped with stepper motors, servo motors, and electronic displacement sensors will be severely interfered with by the strong magnetic field and will malfunction, making them unsuitable for direct application in this extreme condition.

[0003] A Chinese invention patent application with publication number CN113066590A discloses a three-step composite Mach probe for plasma diagnostics. This design optimizes the arrangement of the detection units at the probe tip, enabling the simultaneous acquisition of multiple sets of plasma parameters. However, this design does not address the axial adjustment structure of the probe. In practical applications, an additional adjustment mechanism is still required to achieve depth adjustment. Furthermore, most currently available purely mechanical adjustment structures employ a single threaded pair or push rod transmission, relying on thread engagement to achieve axial feed. The inherent helix angle characteristic of threaded transmission causes the driven component to undergo circumferential parasitic rotation along with the screw, directly causing the probe tip to deflect at an angle, thus disrupting the pre-calibrated detection angle. Additionally, some designs with added anti-rotation structures suffer from excessive size, high frictional resistance, and poor adjustment accuracy, making them unsuitable for the limited vacuum pipe installation space of tokamak devices and unable to meet the accuracy maintenance requirements of long-term reciprocating adjustment. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a probe anti-rotation axial adjustment structure for use in a strong magnetic field vacuum environment.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a probe anti-rotation axial adjustment structure for a strong magnetic field vacuum environment, comprising a probe shaft base, a probe shaft nut on the left side of the probe shaft base, a probe shaft sleeve on the left side of the probe shaft nut, and a probe connected to the left side of the probe shaft sleeve; a right-hand thread is provided on the left side of the probe shaft base surface and the right side of the inner surface of the probe shaft nut, and the probe shaft base and the probe shaft nut are connected by the right-hand thread; a left-hand thread is provided on the right side of the probe shaft sleeve surface and the left side of the inner surface of the probe shaft nut, and the probe shaft nut and the probe shaft sleeve are connected by the left-hand thread; two guide sliders are provided on the left side of the probe shaft base surface, and guide grooves that cooperate with the guide sliders are provided on both sides inside the probe shaft sleeve.

[0006] Furthermore, a positioning rod is fixedly provided on one side of the two guide grooves, and the interior of each of the two guide sliders is provided with a positioning hole that cooperates with the positioning rod.

[0007] Furthermore, the positioning hole is equipped with a plurality of ball bearings that rotate inside, and the positioning rod contacts the surface of the ball bearings inside the positioning hole.

[0008] Furthermore, a connecting rotating bracket is threadedly connected to the left side of the probe shaft sleeve surface, and the connecting rotating bracket has an annular groove inside. The inner surface of the annular groove has an inclined surface, and one side of the inclined surface contacts one end of the connecting slide rod.

[0009] Furthermore, a connecting ring is fixedly provided on one side of the surface of the connecting slide rod, and a connecting spring is provided between one side of the surface of the connecting ring and the inside of the probe shaft sleeve, with the inner surface of the connecting spring sliding in contact with the outer surface of the connecting slide rod.

[0010] Furthermore, a fixed seat is fixedly provided on the left side of the probe shaft base, and a movable frame is movably provided on the left side of the fixed seat through several telescopic rods. A locking rotating frame is threaded on the outer circumferential surface of the movable frame, and several oblique sliding grooves are provided inside the locking rotating frame.

[0011] Furthermore, the movable frame is equipped with several locking arc blocks inside, and each of the locking arc blocks has a locking rod fixed on one side. One end of the locking rod extends into the interior of the locking rotating frame, and a control slider is fixed on one end of the locking rod. One side of the control slider is slidably connected to the interior of the corresponding inclined slide groove.

[0012] Furthermore, a fixed stop is fixedly provided on one side of the surface of the locking rod, and a locking spring is provided between one side of the fixed stop and the interior of the movable frame. The inner surface of the locking spring slides in contact with the surface of the locking rod, and one end of the locking spring is fixedly connected to one side of the fixed stop.

[0013] The beneficial effects achieved by the present invention using the above structure are as follows:

[0014] 1. The entire adjustment structure is made entirely of mechanical components, requiring no electronic components. It can operate stably for extended periods in strong magnetic fields and high vacuum environments at the level of several Tesla, without being susceptible to electromagnetic interference and thus adaptable to the extreme operating conditions of tokamak devices. The differential rotational threaded drive, combined with the circumferential guide and limiting structure, completely converts the rotational input into a pure axial translational output, thoroughly offsetting the circumferential parasitic torque generated during the threaded drive. This ensures that the probe's detection angle remains constant throughout the adjustment process, effectively avoiding diagnostic data deviations caused by angle shifts and improving the accuracy of fusion physics experimental measurement results.

[0015] 2. The differential thread transmission system enables the superposition of two-stage displacements, achieving a larger adjustment stroke with the same number of rotations. Furthermore, by matching threads with different leads, higher adjustment resolution can be achieved, meeting the requirements for continuous high-precision adjustment within the range of 0 to 10 centimeters. The guide structure employs rolling friction, significantly reducing frictional resistance and component wear during axial movement, improving the accuracy retention and service life of long-term reciprocating adjustments. The overall design uses a coaxial nested arrangement, with all transmission and limiting components arranged along the same axis, occupying minimal radial space and adapting to the limited vacuum piping installation environment of tokamak devices.

[0016] 3. After adjustment, the transmission nut can be clamped and fixed by the external locking structure. Friction counteracts the rotational tendency caused by device vibration and thread clearance, preventing axial movement of the probe and improving long-term stability of the working position. The probe and sleeve employ a multi-point circumferential locking structure driven by an inclined plane. Installation and removal of the probe can be completed simply by rotating the external rotating component, adapting to offline maintenance needs in a vacuum environment. The multi-point positioning ensures that the probe is coaxial with the transmission sleeve after assembly, preventing angular misalignment during assembly and ensuring the initial calibration accuracy of the detection angle. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of a probe anti-rotation axial adjustment structure for use in a strong magnetic field vacuum environment according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the probe shaft base and fixing seat structure according to an embodiment of the present invention;

[0020] Figure 3This is a schematic diagram of the fixed base, movable frame, and locking rotating frame structure according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the internal structure of the movable frame and the locking rotating frame according to an embodiment of the present invention;

[0022] Figure 5 This is an embodiment of the present invention. Figure 4 Enlarged schematic diagram of the structure at point A;

[0023] Figure 6 This is a schematic diagram of the probe shaft nut structure according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the probe shaft sleeve and probe structure according to an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the internal structure of the probe shaft sleeve in an embodiment of the present invention.

[0026] In the diagram, 1. Probe shaft base; 2. Probe shaft nut; 3. Probe shaft sleeve; 4. Probe; 5. Guide slider; 6. Guide groove; 7. Positioning rod; 8. Positioning hole; 9. Right-hand thread; 10. Left-hand thread; 11. Fixed seat; 12. Telescopic rod; 13. Movable frame; 14. Locking rotating frame; 15. Locking arc block; 16. Locking rod; 17. Fixed stop block; 18. Locking spring; 19. Control slider; 20. Angled groove; 21. Connecting groove; 22. Connecting hole; 23. Connecting rotating frame; 24. Connecting slide rod; 25. Connecting ring; 26. Connecting spring. Detailed Implementation

[0027] 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.

[0028] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 this invention.

[0029] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a probe anti-rotation axial adjustment structure for use in a strong magnetic field vacuum environment.

[0030] Example 1:

[0031] Please see Figures 1 to 8 As shown, a probe anti-rotation axial adjustment structure for a strong magnetic field vacuum environment includes: a probe shaft base 1, a probe shaft nut 2 on the left side of the probe shaft base 1, a probe shaft sleeve 3 on the left side of the probe shaft nut 2, and a probe 4 connected to the left side of the probe shaft sleeve 3.

[0032] This structure is used in the extreme conditions of strong magnetic fields and high vacuum in tokamak magnetic confinement nuclear fusion devices. The whole structure is a purely mechanical structure with no electronic components, sensors, or electric drive components. It can withstand strong magnetic fields of several Tesla and electromagnetic radiation and vacuum environment inside the device. The overall adjustment stroke meets the high-precision axial adjustment requirements of 0-10cm. The core realizes axial translation and complete circumferential locking to ensure constant probe detection angle and avoid diagnostic data deviation.

[0033] Overall assembly sequence: The probe shaft base 1 is the fixed reference component of the whole machine and is fixed to the outer wall of the vacuum chamber of the nuclear fusion device; the probe shaft nut 2 and the probe shaft sleeve 3 are assembled coaxially in sequence, and the probe 4 is fixed to the front end of the probe shaft sleeve 3 as the detection terminal; all kinematic pairs, threaded pairs and limiting structures are arranged coaxially to ensure the coaxiality of the movement and the adjustment accuracy.

[0034] Furthermore, the left side of the probe shaft base 1 surface and the right side of the inner surface of the probe shaft nut 2 are provided with a right-hand thread 9, and the probe shaft base 1 and the probe shaft nut 2 are threadedly connected by the right-hand thread 9; the right side of the probe shaft sleeve 3 surface and the left side of the inner surface of the probe shaft nut 2 are provided with a left-hand thread 10, and the probe shaft nut 2 and the probe shaft sleeve 3 are threadedly connected by the left-hand thread 10.

[0035] It should be noted that the probe shaft base 1 is a fixed base, and its left end outer circle is machined with a right-hand thread 9; the probe shaft nut 2 is a hollow rotary transmission component, and its interior is divided into two threaded sections along the axial direction: the right inner thread matches and meshes with the right-hand thread 9 of the base, and the left inner thread is a left-hand thread 10, which matches and meshes with the left-hand thread 10 on the right end outer circle of the probe shaft sleeve 3, forming a differential compound helical transmission pair.

[0036] Motion principle: The probe shaft nut 2 is driven manually or remotely to rotate around the coaxial axis. Let the lead of the right-hand thread 9 be P1 and the lead of the left-hand thread 10 be P2, and the number of rotations of the nut 2 be N. Due to the constraint of the subsequent circumferential limiting structure, the circumferential angular velocity of the probe shaft sleeve 3 is 0, and it only performs axial translation. The total axial feed of the sleeve 3 is S3 = N·P1 + P2, which realizes linear continuous high-precision adjustment from 0-10cm.

[0037] Thread side effects: By relying on the combination of opposite-direction differential threads, a single rotary input is converted into a superposition of two levels of axial displacement, which improves the adjustment stroke and adjustment accuracy, and at the same time provides a motion decoupling basis for the anti-rotation structure.

[0038] Furthermore, the left side of the probe sleeve 3 is provided with a connecting groove 21 that mates with the probe 4. Connecting slide rods 24 are slidably provided around the inside of the connecting groove 21, and connecting holes 22 that mate with the connecting slide rods 24 are provided around the surface of the probe 4. By controlling one end of each of the four connecting slide rods 24 to be inserted into the four connecting holes 22 respectively, a stable connection between the probe sleeve 3 and the probe 4 is achieved.

[0039] Specifically, a connecting rotating frame 23 is threaded onto the left side of the probe shaft sleeve 3. The connecting rotating frame 23 has an annular groove inside, and the inner surface of the annular groove has a bevel. One side of the bevel contacts one end of the connecting slide rod 24. By rotating the connecting rotating frame 23, the position of the connecting rotating frame 23 on the surface of the probe shaft sleeve 3 changes. The annular bevel inside the connecting rotating frame 23 abuts against one end of the connecting slide rod 24, allowing one end of the connecting slide rod 24 to be inserted into the connecting hole 22, thus completing the connection operation between the probe shaft sleeve 3 and the probe 4.

[0040] Furthermore, a connecting ring 25 is fixedly provided on one side of the surface of the connecting slide rod 24, and a connecting spring 26 is provided between one side of the surface of the connecting ring 25 and the inside of the probe shaft sleeve 3. The inner surface of the connecting spring 26 slides in contact with the outer surface of the connecting slide rod 24. In the natural state, the connecting spring 26 pushes the connecting ring 25 to slide outward, so that the end of the connecting slide rod 24 near the probe 4 is completely inside the probe shaft sleeve 3. At this time, there is no connection or positioning between the probe shaft sleeve 3 and the probe 4. By rotating the connecting rotating frame 23, the position of the connecting rotating frame 23 on the surface of the probe shaft sleeve 3 is changed. The annular inclined surface inside the connecting rotating frame 23 abuts against one end of the connecting slide rod 24, so that one end of the connecting slide rod 24 is inserted into the inside of the connecting hole 22, thus completing the connection operation between the probe shaft sleeve 3 and the probe 4.

[0041] It should be noted that a connecting groove 21 is provided on the left end of the probe shaft sleeve 3, serving as the positioning and installation reference for the probe 4; connecting holes 22 are evenly distributed around the outer circumference of the right end of the probe 4, corresponding one-to-one with the connecting slide rods 24 arranged radially inside the connecting groove 21, achieving multi-point circumferential positioning and ensuring that the probe 4 is coaxial with the sleeve 3 after assembly and that the detection angle is not offset. The connecting rotating bracket 23 is threaded onto the outer circumference of the left end of the probe shaft sleeve 3 and can rotate forward and backward along the sleeve axis; its internal annular groove is provided with an annular inclined surface, providing radial pushing driving force for the connecting slide rods 24, which is a purely mechanical quick-release locking mechanism, suitable for the probe disassembly and maintenance needs in a vacuum environment. Under normal conditions, the connecting spring 26 is in a slightly stretched state. The connecting ring 25 pulls the connecting slide rod 24 radially back, completely retracting the end of the slide rod 24 into the connecting groove 21. At this point, the probe 4 can be freely installed and removed. Rotating the connecting rotating frame 23 axially moves the annular inclined surface, causing the connecting slide rod 24 to extend radially against the spring force. The end of the slide rod 24 inserts into the connecting hole 22, completing the rigid locking of the probe 4. This connection structure eliminates the risk of loosening, providing fully mechanical locking and is suitable for vacuum and strong magnetic field conditions. Four-point circumferential positioning prevents probe 4 from deflecting during assembly, further ensuring the accuracy of the detection angle.

[0042] like Figure 3 and Figure 7 As shown, two guide sliders 5 are provided on the left side of the probe shaft base 1 surface, and guide grooves 6 that cooperate with the guide sliders 5 are provided on both sides inside the probe shaft sleeve 3. A positioning rod 7 is also fixedly provided on one side inside the two guide grooves 6, and a positioning hole 8 that cooperates with the positioning rod 7 is provided inside the two guide sliders 5. Several balls are rotatably provided inside the positioning hole 8, so that the positioning rod 7 contacts the surface of the balls inside the positioning hole 8, so that the sliding contact becomes rolling contact, reducing the wear of the positioning rod 7. By utilizing the sliding cooperation between the guide sliders 5 and the guide grooves 6, the circumferential rotational freedom of the probe shaft sleeve 3 is restricted.

[0043] It should be noted that two sets of guide sliders 5 are symmetrically fixed to the outer circle of the left end of the probe shaft base 1, and the sliders extend along the axial direction of the base; two guide grooves 6 are symmetrically opened on the inner wall of the probe shaft sleeve 3, and the grooves are arranged along the entire length of the sleeve. The guide sliders 5 are embedded in the guide grooves 6 to form a sliding pair that slides axially and locks circumferentially. A positioning rod 7 is fixed in the guide groove 6, and a matching positioning hole 8 is opened inside the guide slider 5. Rolling balls are embedded in the positioning hole 8; the positioning rod 7 and the balls form a rolling friction fit, replacing the traditional sliding friction, which greatly reduces the motion resistance and component wear during axial adjustment, and improves the accuracy and service life of long-term reciprocating adjustment.

[0044] Mechanical principle: The parasitic torque Tf generated by the threaded transmission will drive the sleeve 3 to rotate circumferentially. The rigid sidewalls of the guide slider 5 and the guide groove 6 generate opposite anti-torsional torque Tres. The structural design satisfies Tres≥Tf, completely locking the circumferential degree of freedom of the sleeve 3, so that the probe 4 detects the deflection angle Δθ≡0.

[0045] It should also be noted that in this embodiment, the slider is located on the fixed part 1 and the slide groove is located on the moving part 3. They can also be arranged in reverse, with the slider on the sleeve and the slide groove on the base, or replaced with a spline pair or a double guide rail structure, all of which fall within the protection scope of this invention.

[0046] The probe shaft base 1, probe shaft nut 2, and probe shaft sleeve 3 form a differential compound helical transmission structure using right-hand threads 9 and left-hand threads 10. The entire structure is made entirely of mechanical components, without any electronic components, and can operate stably for a long time in the strong magnetic field and high vacuum environment of the tokamak device. The guide slider 5 and the guide groove 6 form an axial sliding pair, which, together with the positioning rod 7, positioning hole 8, and internal ball bearings, forms a rolling support structure. This ensures smooth axial movement of the probe shaft sleeve 3 while completely restricting its circumferential rotation. The circumferential torque generated during the threaded transmission process can be canceled out by the guide slider 5 and the guide groove 6, keeping the probe 4's detection deflection angle constant and effectively avoiding diagnostic data deviations caused by angular offsets. The connecting groove 21 on the left side of the probe sleeve 3 is equipped with multiple sets of connecting slide rods 24, forming a multi-point positioning structure with the connecting hole 22 on the probe 4 surface. The connecting rotating frame 23 drives the connecting slide rods 24 to move by means of the internal annular inclined surface. The connecting spring 26 and the connecting ring 25 realize the self-reset of the connecting slide rods 24. This mechanical locking and reset structure can complete the quick disassembly and assembly and reliable fixation of the probe 4. The circumferential multi-point cooperation can also avoid the positional deviation of the probe 4 during the assembly stage. The differential thread structure combined with the guide limit structure works together to achieve continuous high-precision axial adjustment in the range of zero to ten centimeters. All the moving pairs and threaded pairs arranged coaxially further ensure the overall coaxiality of the movement, improving the adjustment accuracy and overall service life of the equipment during long-term use.

[0047] Example 2:

[0048] This embodiment is a rotating positioning and locking mechanism for the probe shaft nut 2, an auxiliary locking structure added based on Embodiment 1. It is used to lock the probe shaft nut 2 after the probe has completed axial position adjustment, preventing nut rotation and probe axial movement due to vibration or thread clearance during device operation, thus further improving structural stability. Furthermore, a fixed seat 11 is fixedly provided on the left side of the probe shaft base 1, and a movable frame 13 is movably provided on the left side of the fixed seat 11 via several telescopic rods 12. A locking rotating frame 14 is threaded on the outer circumferential surface of the movable frame 13, and the interior of the locking rotating frame 14 has several inclined sliding grooves 20. Several locking arc-shaped blocks 15 are movably provided inside the movable frame 13, and a locking rod 16 is fixedly provided on one side of each locking arc-shaped block 15. One end of the locking rod 16 extends into the interior of the locking rotating frame 14, and a control slider 19 is fixedly provided on one end of the locking rod 16. One side of the control slider 19 is aligned with the corresponding inclined... The slide groove 20 is internally slidably connected; by rotating the locking rotating frame 14, the position of the locking rotating frame 14 on the surface of the movable frame 13 is adjusted, thereby adjusting the position of the control slider 19 on the inclined slide groove 20. By utilizing the sliding cooperation between the inclined slide groove 20 and the control slider 19, one end of the locking rod 16 pushes the locking arc block 15 closer to the outer surface of the probe shaft nut 2. The arc surface of the locking arc block 15 contacts the surface of the probe shaft nut 2. The arc surface of the locking arc block 15 is provided with a silicone pad to improve the contact friction between the locking arc block 15 and the probe shaft nut 2, ensuring the locking stability of the probe shaft nut 2.

[0049] Specifically, the fixed base 11 is rigidly fixed to the outer left side of the probe shaft base 1, serving as the fixed reference for the entire locking mechanism. The fixed base 11 and the movable frame 13 are connected by multiple sets of telescopic rods 12. The telescopic rods 12 only allow the movable frame 13 to float slightly axially, limiting radial offset and ensuring that the locking mechanism is coaxial with the probe shaft nut 2. The entire locking mechanism is coaxially sleeved on the outside of the probe shaft nut 2, without interfering with the normal rotation and adjustment of the nut 2, and only performs the locking function after adjustment is completed.

[0050] Furthermore, a fixed stop 17 is fixedly provided on one side of the surface of the locking rod 16, and a locking spring 18 is provided between one side of the fixed stop 17 and the interior of the movable frame 13. The inner surface of the locking spring 18 slides in contact with the surface of the locking rod 16, and one end of the locking spring 18 is fixedly connected to one side of the fixed stop 17. In the natural state, the locking spring 18 pulls the fixed stop 17 to move towards the probe shaft nut 2, and one end of the locking rod 16 is limited by the inclined slide groove 20 through the control slider 19.

[0051] Specifically, the locking rotating frame 14 is threaded onto the outer circumference of the movable frame 13, allowing it to rotate around the same axis and move axially. Multiple oblique grooves 20 are formed on the inner circumference of the locking rotating frame 14, with the grooves following an inclined trajectory, converting the rotational motion of the locking rotating frame 14 into the radial linear motion of the control slider 19. The control slider 19 is fixed to the outer end of the locking rod 16 and slidably embedded inside the oblique grooves 20. When the locking rotating frame 14 is rotated, the inclined surface of the oblique grooves 20 presses against the control slider 19, causing the locking rod 16 to move radially towards the axis.

[0052] The locking arc block 15 is the locking actuator. Its inner arc surface fits the outer circle of the probe shaft nut 2, and a silicone pad is added to the arc surface: on the one hand, it increases the friction coefficient of the contact surface and improves the locking friction; on the other hand, it plays a buffering and anti-slip role, preventing hard metal contact from scratching the outer thread of the nut 2. The fixed stop 17 and the locking spring 18 form an automatic reset mechanism: in the naturally unlocked state, the locking spring 18 pulls the fixed stop 17 by elastic tension, causing the locking rod 16 and the locking arc block 15 to move radially outward. The arc block is completely separated from the probe shaft nut 2, and the nut 2 can rotate freely without affecting the axial adjustment operation.

[0053] Locking action procedure: After the probe is adjusted to the target axial position, rotate the locking rotating frame 14 in the forward direction → the inclined slide 20 pushes the control slider 19 to move radially inward → the locking rod 16 drives the locking arc block 15 to hold the probe shaft nut 2 → rely on friction to lock the nut 2, preventing rotation and axial movement; rotate the locking rotating frame 14 in the reverse direction, the locking spring 18 pulls the component to reset, and the lock is released.

[0054] By fixing the fixed base 11 to the outside of the probe shaft base 1, and connecting the movable frame 13 through multiple telescopic rods 12, the telescopic rods 12 constrain the radial position of the movable frame 13, ensuring that the movable frame 13 and its surrounding components remain coaxial with the probe shaft nut 2, thus preventing interference with the normal rotation adjustment of the probe shaft nut 2. The locking rotating frame 14 mounted on the outer periphery of the movable frame 13 drives the control slider 19 to move via the inner inclined slide groove 20. The control slider 19, in conjunction with the locking rod 16 and the locking arc block 15, completes the radial feed action. The silicone pad on the inner arc surface of the locking arc block 15 increases the contact friction and buffers the hard contact between components, protecting the outer circular structure of the probe shaft nut 2. The fixed stop 17, together with the locking spring 18, forms a reset assembly. When the locking state is released, it can automatically return the locking rod 16 and the locking arc block 15 to their original positions, ensuring that the probe shaft nut 2 can rotate normally to adjust its axial position. The entire locking mechanism is fixed as a whole by relying on the probe shaft base 1. After the probe 4 completes the axial position adjustment, it can form a stable clamping and locking of the probe shaft nut 2, which can offset the vibration generated by the operation of the device and the adverse effects caused by the thread clearance, prevent the probe shaft nut 2 from rotating, and avoid the probe 4 from moving axially. Based on the first embodiment, the positional stability of the entire adjustment structure during operation is further enhanced. The entire locking component also adopts a purely mechanical design and can be adapted to the working environment of strong magnetic field and high vacuum.

[0055] The usage method of the probe anti-rotation axial adjustment structure is as follows:

[0056] Step 1: Insert the right end of probe 4 into the connecting groove 21 at the left end of probe shaft sleeve 3. Adjust the circumferential angle of probe 4 so that each connecting hole 22 is coaxially aligned with the corresponding connecting slide rod 24. Rotate the connecting rotating frame 23 to feed it axially along the external thread of probe shaft sleeve 3. The annular inclined surface inside the connecting rotating frame 23 gradually pushes the outer end of each connecting slide rod 24. The connecting slide rod 24 overcomes the elastic force of the connecting spring 26 and slides radially inward until the inner end of the connecting slide rod 24 is completely inserted into the corresponding connecting hole 22, thus completing the coaxial rigid connection between probe 4 and probe shaft sleeve 3.

[0057] Step 2: Rotate the locking rotating frame 14 in the opposite direction to make it move outward along the external thread of the movable frame 13. The inclined slide groove 20 on the inner side of the locking rotating frame 14 moves axially synchronously and releases the radial compression on the control slider 19. The locking spring 18 pulls the locking rod 16 to slide outward radially through the fixed stop block 17, causing the locking arc block 15 to move outward synchronously and completely separate from the outer surface of the probe shaft nut 2, releasing the circumferential constraint on the probe shaft nut 2 and reserving movement space for subsequent axial adjustment.

[0058] Step 3: Manually or via a remote mechanical transmission mechanism, drive the probe shaft nut 2 to rotate uniformly around the overall central axis. The probe shaft nut 2, through the engagement of the inner right-hand thread 9 with the probe shaft base 1, moves axially away from the probe shaft base 1. Simultaneously, the inner left-hand thread 10 of the probe shaft nut 2 pushes the probe shaft sleeve 3 to move further axially in the same direction relative to the probe shaft nut 2. The guide slider 5 on the probe shaft base 1 is embedded in the guide groove 6 of the probe shaft sleeve 3, rigidly restricting the circumferential rotational freedom of the probe shaft sleeve 3. The positioning rod 7 and the ball inside the positioning hole 8 convert sliding friction into rolling friction, reducing movement resistance and reducing component wear, so that the probe 4 moves purely axially with the probe shaft sleeve 3 until the probe 4 extends into the vacuum chamber to the preset experimental target position.

[0059] Step 4: Keeping the axial position of probe 4 unchanged, rotate the locking rotating frame 14 in the forward direction so that it moves inward along the external thread of the movable frame 13. The inclined groove 20 on the inner side of the locking rotating frame 14 presses the control slider 19 to slide inward radially. The locking rod 16 pushes the locking arc block 15 to move inward synchronously until the inner arc surface of the locking arc block 15 is tightly attached to the outer surface of the probe shaft nut 2. The silicone pad on the arc surface of the locking arc block 15 increases the contact friction force, counteracts the rotation tendency caused by the vibration of the device and the thread gap, and completes the circumferential locking of the probe shaft nut 2, fixing the axial working position of probe 4.

[0060] Step 5: When the experiment is over and the probe 4 needs to be adjusted or disassembled, first release the locking of the rotating frame 14 to the probe shaft nut 2 as in Step 2, drive the probe shaft nut 2 to rotate in the opposite direction, and drive the probe shaft sleeve 3 and the probe 4 to gradually retract axially to the initial installation position. Then rotate the connecting rotating frame 23 in the opposite direction so that it retracts axially along the external thread of the probe shaft sleeve 3, releasing the pushing action of the annular inclined surface on the connecting slide rod 24. The connecting spring 26 pulls the connecting slide rod 24 radially outward to reset through the connecting ring 25, so that the inner end of the connecting slide rod 24 is completely separated from the connecting hole 22, releasing the connection constraint between the probe 4 and the probe shaft sleeve 3. The probe 4 can then be taken out of the connecting groove 21 to complete the disassembly.

[0061] The probe anti-rotation axial adjustment structure in this application is mainly used to solve the technical problems of the electric adjustment structure being unable to work stably due to strong magnetic field interference under the extreme conditions of strong magnetic field and high vacuum in tokamak magnetic confinement nuclear fusion device. When adjusting the axial distance of the probe using the traditional single threaded pair drive, it inevitably causes the probe to rotate circumferentially, which destroys the pre-calibrated detection angle and causes the acquisition deviation of fusion physics diagnostic data. At the same time, after the adjustment is completed, the probe is easily affected by the vibration of the device and will move axially. The probe is inconvenient to disassemble and maintain and the assembly angle accuracy is difficult to guarantee. The ingenuity of this application lies in the use of a probe shaft base 1, probe shaft nut 2, and probe shaft sleeve 3 to form a differential compound helical transmission structure with right-hand thread 9 and left-hand thread 10. The entire process utilizes purely mechanical components to adapt to strong magnetic field and high vacuum operating environments. Simultaneously, a guide slider 5 is set in the probe shaft base 1, forming a circumferential rigid limit with the guide groove 6 of the probe shaft sleeve 3. Combined with a positioning rod 7 and a positioning hole 8 with built-in balls, it reduces component wear during movement, completely decoupling the rotary input and axial output of the screw drive. This ensures that the probe 4 only produces pure axial translation without circumferential angular deflection, guaranteeing a constant detection angle throughout the entire process. Based on this, a purely mechanical locking mechanism consisting of a fixed base 11, a telescopic rod 12, a movable frame 13, a locking rotating frame 14, a locking arc block 15, and a locking spring 18 is added. This mechanism can lock the probe shaft nut 2 after adjustment to prevent it from rotating or moving axially. At the same time, a circumferential multi-point quick-release connection structure consisting of a connecting groove 21, a connecting slide rod 24, a connecting rotating frame 23, and a connecting spring 26 is configured to balance the convenience of probe disassembly and maintenance with the accuracy of assembly angle. The overall structure adopts a coaxial nested arrangement, which occupies little space and can achieve high-precision anti-rotation axial adjustment within the range of zero to ten centimeters without the need for any electronic components.

[0062] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the 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 its spirit or essential characteristics. 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 scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0065] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A probe anti-rotation axial adjustment structure for use in a strong magnetic field vacuum environment, comprising a probe shaft base (1), characterized in that, The probe shaft base (1) is provided with a probe shaft nut (2) on the left side, and a probe shaft sleeve (3) is provided on the left side of the probe shaft nut (2). A probe (4) is also connected to the left side of the probe shaft sleeve (3). A right-hand thread (9) is provided on the left side of the surface of the probe shaft base (1) and the right side of the inner surface of the probe shaft nut (2). The probe shaft base (1) and the probe shaft nut (2) are connected by the right-hand thread (9). A left-hand thread (10) is provided on the right side of the surface of the probe shaft sleeve (3) and the left side of the inner surface of the probe shaft nut (2). The probe shaft nut (2) and the probe shaft sleeve (3) are connected by the left-hand thread (10). Two guide sliders (5) are provided on the left side of the surface of the probe shaft base (1). Guide grooves (6) that cooperate with the guide sliders (5) are provided on both sides inside the probe shaft sleeve (3).

2. The probe anti-rotation axial adjustment structure for a strong magnetic field vacuum environment according to claim 1, characterized in that, A positioning rod (7) is fixedly provided on one side inside the two guide slides (6), and a positioning hole (8) that cooperates with the positioning rod (7) is provided inside the two guide sliders (5).

3. The probe anti-rotation axial adjustment structure for a strong magnetic field vacuum environment according to claim 2, characterized in that, The positioning hole (8) is equipped with a number of ball bearings that rotate inside, and the positioning rod (7) is in contact with the surface of the ball bearings inside the positioning hole (8).

4. The probe anti-rotation axial adjustment structure for a strong magnetic field vacuum environment according to claim 1, characterized in that, The left side of the probe sleeve (3) is provided with a connecting groove (21) that cooperates with the probe (4). The connecting groove (21) is provided with a connecting slide rod (24) sliding around its perimeter. The probe (4) is provided with a connecting hole (22) that cooperates with the connecting slide rod (24) around its perimeter. The left side of the probe sleeve (3) is threaded with a connecting rotating frame (23). The connecting rotating frame (23) is provided with an annular groove inside. The inner surface of the annular groove is provided with an inclined surface. One side of the inclined surface is in contact with one end of the connecting slide rod (24).

5. The probe anti-rotation axial adjustment structure for a strong magnetic field vacuum environment according to claim 4, characterized in that, A connecting ring (25) is fixedly provided on one side of the surface of the connecting slide rod (24), and a connecting spring (26) is provided between one side of the surface of the connecting ring (25) and the inside of the probe shaft sleeve (3). The inner surface of the connecting spring (26) slides in contact with the outer surface of the connecting slide rod (24).

6. The probe anti-rotation axial adjustment structure for a strong magnetic field vacuum environment according to claim 1, characterized in that, A fixed seat (11) is fixedly provided on the left side of the probe shaft base (1), and a movable frame (13) is movably provided on the left side of the fixed seat (11) through several telescopic rods (12). A locking rotating frame (14) is threaded on the outer circumferential surface of the movable frame (13), and several inclined sliding grooves (20) are provided inside the locking rotating frame (14).

7. The probe anti-rotation axial adjustment structure for a strong magnetic field vacuum environment according to claim 6, characterized in that, The movable frame (13) is equipped with several locking arc blocks (15) inside, and each of the locking arc blocks (15) is fixed with a locking rod (16) on one side. One end of the locking rod (16) extends into the interior of the locking rotating frame (14), and one end of the locking rod (16) is fixed with a control slider (19). One side of the control slider (19) is slidably connected to the interior of the corresponding inclined slide groove (20).

8. The probe anti-rotation axial adjustment structure for a strong magnetic field vacuum environment according to claim 7, characterized in that, A fixed stop (17) is fixedly provided on one side of the surface of the locking rod (16), and a locking spring (18) is provided between one side of the fixed stop (17) and the interior of the movable frame (13). The inner surface of the locking spring (18) slides in contact with the surface of the locking rod (16), and one end of the locking spring (18) is fixedly connected to one side of the fixed stop (17).

Images