An X-ray tube core assembly structure capable of precisely adjusting the position of a ZR axis

Abstract

The application discloses an X-ray tube core assembly structure capable of precisely adjusting the position of a ZR shaft, which comprises a fixed tube seat, a tube core assembly shaft for mounting an X-ray tube core and a fine-adjustable assembly component; the tube core assembly shaft is fixedly assembled on the fixed tube seat through the fine-adjustable connecting component; the movement of the tube core assembly shaft in the axial direction position fine adjustment is recorded as Z-direction displacement, and the movement of the tube core assembly shaft rotating around the self axis fine adjustment is recorded as R-direction rotation; the tube core assembly shaft realizes Z-direction fine adjustment and R-direction fine adjustment through the fine-adjustable connecting component.

Description

Technical Field

[0001] This invention belongs to the field of X-ray tube assembly. Background Technology

[0002] The methods for axial fixing and positioning of X-ray tube cores within the tube assembly are currently mainly divided into four categories in the industry:

[0003] 1. Anode Bolt-Fixed Type: Bolt columns are welded to the outer shell of the X-ray tube anode, and are directly locked to the tube assembly by bolts. The Z-axis position is adjusted by increasing or decreasing the thickness of the shims at the bolt columns. The cathode end does not require additional fixation, but the R-axis is completely non-adjustable, and the focal position depends on a one-time assembly, requiring extremely high consistency in machining and assembly.

[0004] 2. Cathode mounting plate fixed type: Bolt holes are opened in the cathode shell, and the tube assembly is transferred through the mounting plate. The Z-axis is also adjusted by shims. The R-axis cannot be adjusted. It has strict requirements on the machining accuracy of parts and the consistency of assembly datum, and rework is difficult.

[0005] 3. Bearing end threaded direct lock type: The anode bearing end of the tube core is directly threaded and locked to the tube assembly ball tube mounting seat. The cathode end is tightened by a support ring. The Z-axis is adjusted by the bearing end face shim. There is no adjustment capability in the R direction. The shim adjustment is repeatedly disassembled and reassembled, which is inefficient and easily damages the tube core.

[0006] 4. Sleeve tapered tension type: The bearing end is fixed by pressing the tapered sleeve, and the support ring at the end of the negative end is tightened. The Z-axis is adjusted by the relative displacement between the collet and the bearing. Although it does not require complete disassembly, the positioning accuracy is poor, it is easy to over-adjust, and the rigidity is weak. It is only suitable for low-end products with small anode mass and low load, and it is difficult to meet the requirements of high stability and high rigidity.

[0007] Schemes 1-3 all require repeated unlocking, removal of the die, addition or removal of shims, and reassembly, which are cumbersome and time-consuming. Furthermore, the die is delicate and fragile, easily damaged during disassembly and assembly. The adjustment accuracy is insufficient, and the R-axis is uncontrollable: traditional structures lack R-axis adjustment mechanisms, making it impossible to correct focal angle deviations; Z-axis shim adjustment is coarse and discrete, resulting in poor precision.

[0008] Although Option 4 allows for fine-tuning, it suffers from significant overshoot and poor repeatability. The low-end sleeve structure has weak axial and radial resistance to offset, and long-term vibration and thermal expansion and contraction can easily lead to focus drift and image quality degradation. Summary of the Invention

[0009] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides an X-ray tube die assembly that enables independent circumferential and axial fine-tuning on the basis of a stable assembly.

[0010] Technical Solution: To achieve the above objectives, the present invention provides an X-ray tube die assembly structure with precisely adjustable ZR axis position, comprising a fixed tube base, a die assembly shaft for mounting the X-ray tube die, and a fine-tuning assembly assembly; the die assembly shaft is fixedly assembled on the fixed tube base via the fine-tuning connection assembly; the movement of the die assembly shaft along the axial direction for fine-tuning is denoted as Z-direction displacement, and the movement of the die assembly shaft rotating around its own axis for fine-tuning is denoted as R-direction rotation; the die assembly shaft performs Z-direction fine-tuning and R-direction fine-tuning via the fine-tuning connection assembly.

[0011] Furthermore, the fixed tube seat is a fastener with a cover-like structure.

[0012] Furthermore, the adjustable connection assembly includes an expansion sleeve, a fixed sleeve, and a flange ring cover; the fixed sleeve has a flange plate on its outside; one end of the fixed pipe seat is an annular flange end plate; the annular flange end plate has a sleeve hole on its axis, and flange mounting holes are around the sleeve hole; the flange plate and the flange ring cover are coaxially fitted to the inner and outer sides of the annular end plate, and the annular flange end plate, the flange plate, and the flange ring cover are fixed and locked into a whole structure by several flange bolts; the expansion sleeve is coaxially movably sleeved inside the fixed sleeve.

[0013] Furthermore, an annular groove is provided on the end face of the core assembly shaft near the annular flange end plate, and an inner shaft is formed on the inner side of the annular groove, which is integral with the core assembly shaft. A central internal thread hole is provided at the center of the inner shaft. The ends of the expansion sleeve and the fixing sleeve away from the annular end plate both extend into the annular groove coaxially. The outer ring of the end of the expansion sleeve extending into the annular groove is integrally provided with a conical outer edge along the contour. The inner ring of the end of the fixing sleeve extending into the annular groove is provided with an inner conical chamfer, which is compatible with the outer conical surface of the outer conical edge. The part of the expansion sleeve extending into the annular groove is provided with a number of hollowed-out dividing slits along the length direction in a circumferential array. The hollowed-out dividing slits divide the part of the expansion sleeve extending into the annular groove into a number of circumferentially arranged petals. The petals surround the inner shaft, and in the initial state, the inner surface of each petal maintains a gap with the outer wall of the inner shaft.

[0014] Furthermore, the inner shaft has keyways on at least two sides, with key blocks inside the keyways. The bottom of the open end of the keyway has a limiting step, and the key blocks are confined to the inside of the limiting step. A pressure sensor is provided between the bottom of the keyway and the key blocks.

[0015] Each key block corresponds to a valve body, and a key groove is provided on the inner side of the valve body along the length direction. The part of each key block that protrudes from the outer circumference of the inner shaft slides in the key groove.

[0016] Furthermore, the end of the expansion sleeve away from the valve body extends out of the outer end of the flange ring cover, and the outer wall surface of the expansion sleeve extending out of the outer end of the flange ring cover is provided with external threads, and a locking nut is threaded onto the external threads; the locking nut is provided with several threaded through holes arranged in a circumferential array along the axial direction, and each threaded through hole is threaded with an external threaded set screw, and the push tip of each external threaded set screw is limited to contact the outer end face of the flange ring cover;

[0017] The expansion sleeve has an integral inner ring wall in the middle, and a screw through hole is provided on the inner ring of the inner ring wall. A locking screw moves coaxially through the screw through hole, and the end of the locking screw is threaded into the central internal thread hole at the center of the inner shaft. A nut is integrally provided on the other end of the locking screw, and there is a gap between the nut and the inner ring wall. Several screw through holes are arranged in a circumferential array on the nut, and several screw internal thread holes are arranged in a circumferential array on the side of the inner ring wall near the nut. An adjusting screw moves through each screw through hole, and the end of each adjusting screw is threaded into the corresponding screw internal thread hole.

[0018] Furthermore, a slot is provided at the end of the expansion sleeve furthest from the valve body.

[0019] Further, R-axis rotation fine adjustment: Under the monitoring of the focus alignment test instrument, a slotted tool is inserted into the slot at the end of the expansion sleeve, so that the rotating expansion sleeve drives the core assembly shaft and the X-ray core mounted on the core assembly shaft to rotate circumferentially through the key block, accurately calibrating the R-axis offset to the qualified range; after the R-axis adjustment is completed, the Z-axis adjustment is performed.

[0020] Beneficial effects: This invention utilizes the sliding fit between the key block on the inner shaft and the keyway groove on the inner wall of the expansion sleeve valve. Rotating the expansion sleeve allows for circumferential fine adjustment of the core assembly shaft via the key block, while the valve body can slide freely along the axial direction of the key block. This removes the constraint of the rotation drive path on axial movement, enabling independent adjustment of the two degrees of freedom without interference. Secondly, a compensation locking method using a differential linkage between the same pitch adjusting screw and the external thread set screw is employed. After the core assembly shaft is finely adjusted, the set screw and adjusting screw are simultaneously screwed in, causing the expansion sleeve to retract in the negative direction while the locking screw advances in the positive direction by an equal amount. The absolute position of the core assembly shaft remains constant, with only the expansion sleeve moving backward relative to the fixed cylinder.

[0021] During the retraction process, the inner conical chamfer of the fixed cylinder wedges against the outer edge of the conical surface of the valve body, converting the axial movement into radial bending deformation of the valve body inward, ultimately causing the valve body to uniformly grip the inner shaft. The self-locking characteristic of the conical surface allows this highly rigid locking state to be permanently maintained without continuous external force.

[0022] A pressure sensor is integrated at the bottom of the keyway. The positive pressure applied when the valve body clamps the inner shaft is transmitted to the sensor through the key block. When the pressure reaches the preset threshold, it indicates that the clamping force is up to standard, providing the operator with a clear signal that the clamping is complete. This avoids overload damage and ensures high consistency and repeatability of the clamping force. Attached Figure Description

[0023] Figure 1 This is an overall schematic diagram;

[0024] Figure 2 This is an overall sectional view;

[0025] Figure 3 This is a schematic diagram of the core assembly shaft structure;

[0026] Figure 4 This is a schematic diagram of an expansion sleeve. Detailed Implementation

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] like Figures 1 to 4 The X-ray tube frame assembly structure shown includes a fixed tube base 7, a frame assembly shaft 17, and a fine-tuning assembly assembly. The fixed tube base 7 is a cover-shaped fixing component, and the frame assembly shaft 17 is used to install the X-ray tube frame. The frame assembly shaft 17 is coaxially fixed to the fixed tube base 7 through the fine-tuning connection assembly. The frame assembly shaft 17 can be finely adjusted in position along the axis and rotated around the axis through the fine-tuning connection assembly. The Z-axis fine-tuning in position along the axis is used to precisely control the distance from the frame focal spot to the exit window, and the R-axis fine-tuning around the axis is used to correct the circumferential angle deviation of the focal spot. The two adjustment processes do not interfere with each other.

[0029] The movement of the core assembly shaft 17 along the axial direction for fine adjustment is denoted as Z-direction displacement, and the movement of the core assembly shaft 17 rotating around its own axis for fine adjustment is denoted as R-direction rotation; the fine-adjustable connection assembly includes an expansion sleeve 15, a fixing sleeve 9, and a flange ring cover 3; a flange 8 is integrally and coaxially mounted on the outside of the fixing sleeve 9; the fixing tube seat 7 is a fixing component with a cover-like structure, and one end of the fixing tube seat 7 is an annular flange end plate 7a; the annular flange end plate 7a has a sleeve hole 5 on its axis, and flange mounting holes 6 are around the sleeve hole 5; the flange 8 and the flange ring cover 3 are respectively coaxially attached to the inner and outer sides of the annular end plate 7a, and the annular flange end plate 7a, the flange 8, and the flange ring cover 3 are fixed and locked into an integral structure by a number of flange bolts.

[0030] The end face of the core assembly shaft 17 near the annular flange end plate 7a is provided with an annular groove 26. An inner shaft 29, which is integral with the core assembly shaft 17, is formed inside the annular groove 26. A central internal thread hole 27 is provided at the center of the inner shaft 29. The expansion sleeve 15 is coaxially and movably sleeved inside the fixed sleeve 9. The ends of the expansion sleeve 15 and the fixed sleeve 9 away from the annular end plate 7a both extend coaxially into the annular groove 26.

[0031] The outer ring of the end of the expansion sleeve 15 that extends into the annular groove 26 is integrally provided with a conical outer edge 41 along the contour; the inner ring of the end of the fixed cylinder 9 that extends into the annular groove 26 is provided with an inner conical chamfer 9a, which is compatible with the outer conical surface of the conical outer edge 41; the portion of the expansion sleeve 15 that extends into the annular groove 26 is provided with a plurality of hollowed-out dividing slits 20 along the length direction in a circumferential array, which divide the portion of the expansion sleeve 15 that extends into the annular groove 26 into a plurality of circumferentially arranged petals 19; the petals 19 surround the inner shaft 29, and in the initial state, the inner surface of each petal 19 maintains a gap 45 with the outer wall surface of the inner shaft 29.

[0032] The inner shaft 29 has keyways 25 on at least two sides, and key blocks 16 are inside the keyways 25. The bottom of the open end of the keyway 25 has a limiting step 28, and the key blocks 16 are restricted to the inside of the limiting step 28. A pressure sensor is provided between the bottom 30 of the keyway 25 and the key blocks 16. The limiting step 28 reliably prevents the key blocks 16 from coming off during repeated adjustments or vibrations.

[0033] Each key block 16 corresponds to a flap 19. A key groove 23 is provided on the inner side of the flap 19 along the length direction. The part of each key block 16 that protrudes from the outer circumferential surface of the inner shaft 29 slides in the key groove 23. The key groove 23 and the key block 16 adopt a precision sliding fit, which can reliably transmit the R-direction rotational torque and allow the flap 19 to generate axial displacement relative to the key block 16, thereby realizing the mechanical decoupling of R-direction drive and Z-direction locking.

[0034] The end of the expansion sleeve 15 away from the valve body 19 extends out of the outer end of the flange ring cover 3, and the outer wall surface of the expansion sleeve 15 extending out of the outer end of the flange ring cover 3 is provided with external threads, and a locking nut 4 is threaded on the external threads; the locking nut 4 is provided with several threaded through holes 2 arranged in a circumferential array along the axial direction, and each threaded through hole 2 is threaded with an external threaded set screw 1, and the push end of each external threaded set screw 1 is limited to contact the outer end face of the flange ring cover 3.

[0035] The expansion sleeve 15 has an integral inner ring wall 21 in the middle, and a screw through hole 22 is provided in the inner ring of the inner ring wall 21. A locking screw 14 is movably inserted coaxially in the screw through hole 22. The end of the locking screw 14 is threaded into the central internal thread hole 27 at the center of the inner shaft 29. A nut 13 is integrally provided at the other end of the locking screw 14. There is a gap between the nut 13 and the inner ring wall 21. A number of screw through holes 12 are arranged in a circumferential array on the nut 13 and are circumferentially arranged on the side of the inner ring wall 21 near the nut 13. An adjusting screw 10 is movably inserted in each screw through hole 12, and the end of each adjusting screw 10 is threaded into the corresponding screw internal thread hole 47.

[0036] A slot 18 is provided at the end of the expansion sleeve 15 away from the valve body 19.

[0037] The direction of screwing in the locking screw 14 is denoted as Z+, and the opposite direction is denoted as Z-.

[0038] The pitch of the external thread of the adjusting screw 10 is the same as the pitch of the external thread set screw 1; the advance distance can be precisely controlled by controlling the rotation angle of the adjusting screw 10 and the external thread set screw 1.

[0039] R-axis rotation fine adjustment:

[0040] First, loosen the external thread set screws 1 appropriately. Under the monitoring of the focal alignment test instrument, use a slotted tool to insert into the slot 18 at the end of the expansion sleeve 15. This allows the rotating expansion sleeve 15 to drive the core assembly shaft 17 and the X-ray core mounted on the core assembly shaft 17 to rotate circumferentially via the key block 16. This precisely calibrates the R-direction offset to the qualified range. Then, initially tighten the external thread set screws 1 so that the inner conical chamfer 9a at the end of the fixed cylinder 9 contacts the outer conical surface of the outer edge 41 of the conical surface of the expansion sleeve 15. This positions the expansion sleeve 15 in the Z-direction, but some of the flaps 19 have not yet tightly gripped the inner shaft 29 inward. At this time, the set screws only eliminate the axial clearance with a small torque, so that the inner conical chamfer 9a fits just right with the outer edge 41 of the conical surface. This provides Z-direction positioning for the expansion sleeve 15 without causing radial deformation. The initial gap 45 is still maintained between the flaps 19 and the inner shaft 29, leaving conditions for interference-free movement for subsequent Z-direction adjustments.

[0041] After the R-axis adjustment is completed, the Z-axis adjustment is performed. The adjustment direction of the die assembly shaft 17 is determined by the focus alignment test instrument, which can be an X-ray real-time imaging system or a laser interferometer, which can simultaneously display the minute deviation of the focus in the Z-axis and R-axis directions.

[0042] If adjustment of the core assembly shaft 17 in the Z+ direction is required: Using a tool, screw each adjusting screw 10 in a Z+ direction, thereby pushing the locking screw 14 to advance the core assembly shaft 17 in the Z+ direction until the core assembly shaft 17 is advanced to the predetermined position in the Z+ direction; then, using a tool, advance each external thread set screw 1 in the Z+ direction, causing the expansion sleeve 15 to displace in the Z- direction under the reaction force. Simultaneously, use a tool to screw each adjusting screw 10 in the Z+ direction in real time, and control the rotation angle in real time to ensure that the displacement of the expansion sleeve 15 in the Z- direction is synchronized with the adjustment screws. The amount by which the adjusting screw 10 is screwed in the Z+ direction remains equal, so that the position of the core assembly shaft 17 remains unchanged under the action of motion cancellation, while the expansion sleeve 15 gradually shifts in the Z- direction alone. This is based on the differential compensation principle of the same pitch: let the set screw be screwed in at an angle θ so that the expansion sleeve moves back ΔZ, and the adjusting screw is also screwed in at the same angle θ so that the locking screw moves forward by the same ΔZ. The net displacement of the locking screw is zero, so the absolute position of the core assembly shaft does not change, only the expansion sleeve moves backward relative to the fixed cylinder, thus converting the axial movement into a conical radial clamping action. Then, the inner conical chamfer 9a at the end of the fixed cylinder 9 forces the outer edge 41 of the conical surface at the end of each petal 19 to bend inward, thereby clamping the inner shaft 29. When each petal 19 is forced to bend inward to a certain extent, the inner side of the petal 19 with the key groove 23 begins to apply pressure to the key block 16, thereby causing the pressure sensor between the bottom 30 of the key groove 25 and the key block 16 to sense the pressure. When the pressure reaches the threshold, it is determined that several petals 19 at the end of the tensioning sleeve 15 have completely and tightly clamped the inner shaft 29. This pressure threshold is pre-calibrated to generate sufficient static friction and contact stiffness to resist the clamping force of vibration and heat load during the operation of the X-ray tube. Typically, the uniform surface pressure formed by the petal 19 on the inner shaft 29 reaches tens of megapascals. The pressure sensor can be connected to an external indicator light or buzzer. Once the set value is reached, it will prompt the operator to stop rotating to prevent overload from causing deformation or damage to the parts. This allows for the adjustment and tightening of the assembly structure, thus ensuring its stability.

[0043] If Z-direction adjustment of the mandrel assembly shaft 17 is required: Using a tool, precisely unscrew each adjusting screw 10 in the Z- direction. Simultaneously, pull the locking screw 14 in the Z- direction, ensuring the locking screw 14, along with the mandrel assembly shaft 17, follows the precise Z-displacement of each adjusting screw 10 until the mandrel assembly shaft 17 reaches the predetermined position along the Z-direction. Then, using a tool, advance each external thread set screw 1 in the Z+ direction. Under the reaction force, the expansion sleeve 15 displaces in the Z- direction. Simultaneously, in real-time, use the tool to screw each adjusting screw 10 in the Z+ direction, and through real-time rotation angle control, ensure that the displacement of the expansion sleeve 15 in the Z-direction is equal to the amount of screwing of each adjusting screw 10 in the Z+ direction, thereby achieving the desired effect. Under the action of motion cancellation, the position of the core assembly shaft 17 remains unchanged. At the same time, the expansion sleeve 15 gradually shifts along the Z-direction, thereby forcibly pushing the outer edge 41 of the conical surface at the end of each valve 19 by the inner conical chamfer 9a at the end of the fixed sleeve 9. This causes each valve 19 to bend inward, thereby clamping the inner shaft 29. When each valve 19 is forced to bend inward to a certain extent, the inner side of the valve 19 with the key groove 23 begins to apply pressure to the key block 16. This causes the pressure sensor between the bottom 30 of the key groove 25 and the key block 16 to sense the pressure. When the pressure reaches the threshold, it is determined that several valves 19 at the end of the expansion sleeve 15 have completely and tightly clamped the inner shaft 29, thereby completing the adjusted clamping action and making the assembly structure stable.

[0044] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An X-ray tube core assembly structure with precisely adjustable ZR axis position, characterized in that: Includes a fixed tube base (7), a tube core assembly shaft (17) for mounting the X-ray tube core, and a finely adjustable assembly assembly; The core assembly shaft (17) is fixedly assembled on the fixed tube seat (7) through the adjustable connecting assembly; the movement of the core assembly shaft (17) along the axial direction for fine adjustment is recorded as Z-direction displacement, and the movement of the core assembly shaft (17) around its own axis for fine adjustment is recorded as R-direction rotation; the core assembly shaft (17) is finely adjusted in the Z direction and R direction through the adjustable connecting assembly.

2. The X-ray tube core assembly structure with precisely adjustable ZR axis position according to claim 1, characterized in that: The fixed tube seat (7) is a fixed component with a cover-like structure.

3. The X-ray tube core assembly structure with precisely adjustable ZR axis position according to claim 1, characterized in that: The adjustable connection assembly includes an expansion sleeve (15), a retaining sleeve (9), and a flange ring cover (3). The fixed cylinder (9) has a flange (8) on the outside; One end of the fixed pipe seat (7) is an annular flange end plate (7a); the annular flange end plate (7a) is provided with a sleeve hole (5) on the axis, and there are flange mounting holes (6) around the sleeve hole (5); the flange (8) and the flange ring cover (3) are respectively coaxially attached to the inner and outer sides of the annular end plate (7a), and the annular flange end plate (7a), the flange (8) and the flange ring cover (3) are fixed and locked into an integral structure by a number of flange bolts; the expansion sleeve (15) is coaxially movably sleeved on the inner side of the fixed cylinder (9).

4. The X-ray tube core assembly structure with precisely adjustable ZR axis position according to claim 3, characterized in that: The end face of the core assembly shaft (17) near the annular flange end plate (7a) is provided with an annular groove (26), and an inner shaft (29) integral with the core assembly shaft (17) is formed on the inner side of the annular groove (26). A central internal thread hole (27) is provided at the center of the inner shaft (29). The ends of the expansion sleeve (15) and the fixing sleeve (9) away from the annular end plate (7a) both extend coaxially into the annular groove (26); The outer ring of the end of the expansion sleeve (15) that extends into the annular groove (26) is integrally provided with a conical outer edge (41) along the contour; the inner ring of the end of the fixed cylinder (9) that extends into the annular groove (26) is provided with an inner conical chamfer (9a), and the inner conical chamfer (9a) and the outer conical surface of the conical outer edge (41) are mutually adapted. The portion of the expansion sleeve (15) extending into the annular groove (26) is arranged in a circumferential array with several hollowed-out dividing slits (20) along the length direction. The hollowed-out dividing slits (20) divide the portion of the expansion sleeve (15) extending into the annular groove (26) into several petals (19) arranged in a circumferential array. The petals (19) surround the inner shaft (29), and in the initial state, the inner surface of each petal (19) maintains a gap (45) with the outer wall surface of the inner shaft (29).

5. The X-ray tube core assembly structure with precisely adjustable ZR axis position according to claim 4, characterized in that: The inner shaft (29) has keyways (25) on at least two sides, and a key block (16) is provided in the keyway (25). The bottom of the open end of the keyway (25) has a limiting step (28), and the key block (16) is restricted to the inside of the limiting step (28). A pressure sensor is provided between the bottom (30) of the keyway (25) and the key block (16). Each key block (16) corresponds to a valve body (19). A key groove (23) is provided on the inner side of the valve body (19) along the length direction. The part of each key block (16) protruding from the outer circumferential surface of the inner shaft (29) slides in the key groove (23).

6. The X-ray tube die assembly structure with precisely adjustable ZR axis position according to claim 5, characterized in that: The end of the expansion sleeve (15) away from the valve body (19) extends out of the outer end of the flange ring cover (3), and the outer wall surface of the expansion sleeve (15) extending out of the outer end of the flange ring cover (3) is provided with external threads, and a locking nut (4) is threaded on the external threads; the locking nut (4) is provided with several threaded through holes (2) in a circumferential array along the axial direction, and each threaded through hole (2) is threaded with an external threaded set screw (1), and the push end of each external threaded set screw (1) is limited to contact the outer end face of the flange ring cover (3); The expansion sleeve (15) is integrally provided with an inner ring wall (21) in the middle, and a screw through hole (22) is provided in the inner ring of the inner ring wall (21); a locking screw (14) is movably passed through the screw through hole (22) coaxially, and the end of the locking screw (14) is threaded in the central internal thread hole (27) at the center of the inner shaft (29). The other end of the locking screw (14) is integrally provided with a nut (13), and there is a gap between the nut (13) and the inner ring wall (21); a number of screw through holes (12) are arranged in a circumferential array on the nut (13) and are connected along the axis; a number of screw internal thread holes (47) are arranged in a circumferential array on the side of the inner ring wall (21) near the nut (13); an adjusting screw (10) is movably passed through each screw through hole (12), and the end of each adjusting screw (10) is threaded in the corresponding screw internal thread hole (47).

7. The X-ray tube die assembly structure with precisely adjustable ZR axis position according to claim 6, characterized in that: The end of the expansion sleeve (15) away from the valve body (19) is provided with a slot (18).

8. The working method of the X-ray tube core assembly structure with precisely adjustable ZR axis position according to claim 7, characterized in that: R-axis rotation fine adjustment: Under the monitoring of the focus alignment test instrument, use a slotted tool to insert into the slot (18) at the end of the expansion sleeve (15), so that the rotating expansion sleeve (15) drives the core assembly shaft (17) and the X-ray core mounted on the core assembly shaft (17) to rotate circumferentially through the key block (16), and accurately calibrate the R-axis offset to the qualified range; after the R-axis adjustment is completed, perform the Z-axis adjustment.

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