High-precision rotating system of mammary gland machine

Abstract

The invention discloses a high-precision rotating system of a mammary gland machine, the mammary gland machine comprises a pulley plate, a main shaft, a bulb tube arm and a detector arm, the high-precision rotating system comprises a C arm rotating mechanism and a bulb tube arm rotating mechanism, one end of the main shaft is arranged on the pulley plate through the C arm rotating mechanism, and the other end of the main shaft is fixedly connected with the detector arm; the bulb tube arm is arranged in the middle of the main shaft through the bulb tube arm rotating mechanism, and the main shaft is a hollow shaft; the C-arm rotating mechanism comprises a worm gear I, a worm I and a limiting ring; the bulb tube arm rotating mechanism comprises a second worm gear, a second worm and two limiting check blocks.

Description

Technical Field

[0001] This invention belongs to the field of rotation technology of mammography machines, and relates to a high-precision rotation system for mammography machines. Background Technology

[0002] A mammography machine is an X-ray machine specifically used for the examination and diagnosis of breast lesions; it is also called a mammography machine. The X-ray tube arm refers to the arm that connects the X-ray tube to the mammography machine, while the C-arm is a combination of the X-ray tube arm and the detector arm of the mammography machine. Because its shape is similar to a C, it is simply called the C-arm.

[0003] Currently, breast mammography machines with tomo functionality on the market, besides the C-arm rotation function to meet different patient positioning needs, also require the X-ray tube arm rotation function to achieve 3D imaging. However, currently, the switching between these two rotational movements is achieved through a clutch, resulting in a complex structure and control logic, making them prone to malfunctions, and preventing simultaneous rotation. Furthermore, achieving the required rotational precision necessitates high-precision machining of the rotating parts, leading to higher costs. Additionally, wear and tear on the rotating structure over long-term operation causes gaps that are difficult to repair, requiring replacement of parts. Finally, due to limitations in wiring and the rotating structure, large-angle rotation is not possible; for example, the rotation angle of the C-arm is generally ±180°, and the rotation angle of the X-ray tube arm is generally ±50°.

[0004] In summary, current breast mammary gland machines with tomo functionality on the market suffer from four main problems: 1. The C-arm rotation and X-ray tube arm rotation use the same motor drive system, resulting in complex control logic and a susceptibility to malfunctions. 2. Achieving rotational precision requires high-precision components in the rotating mechanism, leading to high manufacturing costs. 3. Long-term wear and tear makes it difficult to resolve and adjust rotational precision issues. 4. The rotation angle range of the C-arm and X-ray tube arm is relatively small, especially the X-ray tube arm, which is generally ±50° on the market. Therefore, designing a high-precision rotation system for breast mammary gland machines to address these issues is particularly necessary. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-precision rotation system for a mammography machine.

[0006] To achieve the above objectives, the technical solution of the present invention is: a high-precision rotating system for a breast mammography machine, the breast mammography machine including a trolley plate, a main shaft, a X-ray tube arm, and a detector arm; the high-precision rotating system includes a C-arm rotating mechanism and a X-ray tube arm rotating mechanism; one end of the main shaft is mounted on the trolley plate via the C-arm rotating mechanism, and the other end of the main shaft is fixedly connected to the detector arm; the X-ray tube arm is mounted in the middle of the main shaft via the X-ray tube arm rotating mechanism; the main shaft is a hollow shaft; the C-arm rotating mechanism includes a worm gear, a worm, and a limiting ring; one end of the main shaft is rotatably mounted on the trolley plate via a tapered bearing; the limiting ring is sleeved on one end of the main shaft; the limiting ring has a limiting protrusion; a limiting pin is fixed on the limiting protrusion; an arc-shaped groove is formed on the trolley plate, and the limiting pin is located in the arc-shaped groove; the worm gear is fixed to one end of the main shaft; the worm... A limiting block 1 is fixed to one side of the wheel and cooperates with the limiting protrusion. The limiting block 1 can abut against both sides of the limiting protrusion. The worm gear 1 is horizontally rotatably mounted on the trolley plate and meshes with the worm wheel 1. The worm gear 1 is also connected to a drive assembly 1 that can rotate it. The ball tube arm rotation mechanism includes a worm wheel 2, a worm gear 2, and two limiting blocks. The middle part of the main shaft is rotatably connected to the ball tube arm through a tapered bearing 2. Bearing seats that cooperate with the tapered bearing 2 are fixed on both sides of the ball tube arm. The two limiting blocks are fixed on the ball tube arm. The worm wheel 2 is fixed in the middle of the main shaft. A limiting block 2 that cooperates with the limiting blocks is fixed to the side of the worm wheel 2. The worm gear 2 is horizontally rotatably mounted on the ball tube arm and meshes with the worm wheel 2. The worm gear 2 is also connected to a drive assembly 2 that can rotate it.

[0007] The drive assembly includes a motor, a drive wheel, a driven wheel, and a transmission belt. The motor is fixed to a trolley plate via a motor mounting base. The trolley plate has a fine-tuning structure for fine-tuning the position of the motor mounting base. The drive wheel is fixed to the output shaft of the motor, the driven wheel is fixed to a worm gear, and the transmission belt is fitted between the drive wheel and the driven wheel.

[0008] An encoder bracket, a potentiometer bracket, and a photoelectric bracket are fixed on the trolley plate respectively. An encoder is fixed on the encoder bracket, and an encoder pinion is fixed on the shaft of the encoder. A potentiometer is fixed on the potentiometer bracket, and a potentiometer pinion is fixed on the shaft of the potentiometer. A photoelectric switch is fixed on the photoelectric bracket. A large gear is fixed at one end of the main shaft, which meshes with both the encoder pinion and the potentiometer pinion. A photoelectric retaining ring that cooperates with the photoelectric switch is fixed at one end of the main shaft.

[0009] One end of the main shaft is threaded with a round nut, and a backstop washer is provided between the round nut and the worm gear.

[0010] The trolley plate is equipped with a worm gear seat, and both ends of the worm gear are rotatably connected to the worm gear seat via a double-sided tapered bearing. Worm end caps are fixed on both sides of the worm gear seat. A worm adjustment pad is also installed on the side of the worm gear seat away from the driven wheel. A clearance adjustment block for adjusting the meshing clearance between the worm gear and the worm wheel is installed on the trolley plate.

[0011] The second drive assembly includes a second motor, a second drive wheel, a second driven wheel, and a second transmission belt. The second motor is fixed to the tube arm via a second motor mounting base. The second drive wheel is fixed to the output shaft of the second motor. The second driven wheel is fixed to the second worm gear. The second transmission belt is sleeved between the second drive wheel and the second driven wheel.

[0012] The main shaft is threaded with a second round nut in the middle, and a second anti-reverse washer is provided between the second round nut and the bearing seat.

[0013] The ball tube arm is equipped with a worm gear seat two, and both ends of the worm gear two are rotatably connected to the worm gear seat two through a double-sided tapered bearing two. Worm end caps two are fixed on both sides of the worm gear seat two. The ball tube arm has a fine-tuning structure two for fine-tuning the position of the worm gear seat two and the position of the motor mounting seat two.

[0014] An encoder bracket 2 and a photoelectric bracket 2 are fixed on the X-ray tube arm respectively. An encoder 2 is fixed on the encoder bracket 2. An encoder pinion 2 is fixed on the shaft of the encoder 2. A photoelectric switch 2 is fixed on the photoelectric bracket 2. A large gear 2 that meshes with the encoder pinion 2 is fixed on the worm gear 2. A photoelectric identification ring that cooperates with the photoelectric switch 2 is fixed on the worm gear 2.

[0015] By adopting the above technical solution, the beneficial effects of the present invention are: 1. This invention provides a high-precision dual-rotation control system with simple control logic and low failure rate.

[0016] 2. The precision requirements for parts in rotating systems are greatly reduced, thus lowering processing costs.

[0017] 3. Gaps and precision issues caused by prolonged use and wear can be eliminated through adjustment.

[0018] 4. It can achieve a wider range of C-arm rotation angles and X-ray tube arm rotation angles. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the C-arm rotating mechanism in this invention. Figure 1 ; Figure 3This is a three-dimensional structural diagram of the C-arm rotating mechanism in this invention. Figure 2 ; Figure 4 This is a partial view of the C-arm rotating mechanism in this invention. Figure 1 ; Figure 5 This is a partial view of the C-arm rotating mechanism in this invention. Figure 2 ; Figure 6 This is an exploded view of a partial location of the C-arm rotating mechanism in this invention; Figure 7 This is a three-dimensional structural diagram of the X-ray tube arm rotating mechanism in this invention. Figure 1 ; Figure 8 This is a three-dimensional structural diagram of the X-ray tube arm rotating mechanism in this invention. Figure 2 ; Figure 9 This is a schematic diagram of the planar structure of the rotating mechanism of the X-ray tube arm in this invention; Figure 10 This is a three-dimensional structural diagram of the X-ray tube arm rotating mechanism in this invention. Figure 3 ; Figure 11 This is an exploded view of a partial location of the rotating mechanism of the X-ray tube arm in this invention; Figure 12 This is a three-dimensional structural diagram of the X-ray tube arm rotating mechanism in this invention. Figure 4 ; In the diagram, 10 is the trolley plate; 10a is the arc groove; 20 is the main shaft; 30 is the X-ray tube arm rotation mechanism; 301 is the adjusting knob; 302 is the second tapered bearing; 303 is the bearing seat; 304 is the second photoelectric switch; 305 is the second photoelectric bracket; 306 is the second encoder; 307 is the second encoder bracket; 308 is the second encoder pinion; 309 is the second round nut; 310 is the photoelectric recognition ring; 311 is the second large gear; 312 is the second motor; and 313 is the limit stop. 314. Fine-tuning structure two; 315. Drive wheel two; 316. Transmission belt two; 317. Driven wheel two; 318. Worm gear two; 319. Anti-reverse washer two; 320. Worm wheel two; 321. Limiting block two; 322. Bushing; 323. Worm gear end cap two; 324. Worm gear seat two; 325. Double-sided tapered bearing two; 326. Motor mounting base two; 327. Adjusting washer; 40. Detector arm; 50. C-arm rotation mechanism; 501. Encoder one; 5 02. Encoder bracket; 503. Photoelectric bracket; 504. Encoder pinion; 505. Potentiometer; 506. Potentiometer bracket; 507. Potentiometer pinion; 508. Photoelectric switch; 509. Large gear; 510. Photoelectric retaining ring; 511. Brake bracket; 512. Brake; 513. Worm gear; 514. Driven wheel; 515. Adjusting shim; 516. Drive belt; 517. Drive wheel; 518. Motor mount 519. Mounting base; 520. Fine-tuning structure; 521. Motor; 522. Worm gear; 523. Worm seat; 524. Round nut; 525. Limiting block; 526. Tapered bearing; 527. Limiting ring; 528. Limiting protrusion; 529. Limiting pin; 530. Anti-reverse washer; 531. Spacer; 532. Worm adjusting shim; 533. Clearance adjusting block; 544. Double-sided tapered bearing; 555. Worm end cap; 66. Ball tube arm. Detailed Implementation

[0020] To further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0021] like Figure 1-12As shown, the high-precision rotation system of this mammography machine includes a trolley plate 10, a main shaft 20, a X-ray tube arm 60, and a detector arm 40. Specifically, the main shaft 20 is a hollow shaft, and the cable of the front C-arm can reach the interior of the column through the interior of the main shaft 20. Since the cable is at the center of rotation, it will not affect the rotation angle of either component, allowing for a wider range of rotation angles. The high-precision rotation system includes a C-arm rotation mechanism 50 and a X-ray tube arm rotation mechanism 30. One end of the main shaft 20 is mounted on the trolley plate 10 through the C-arm rotation mechanism 50, and the other end of the main shaft 20 is fixedly connected to the detector arm 40. In this embodiment, the main shaft 20 also has a hollow shaft. One end is fixedly connected to the detector arm 40 via a mounting base for the detector arm 40, thus forming a C-arm together with the X-ray tube arm 60. The X-ray tube arm 60 is mounted in the middle of the main shaft 20 via a rotating mechanism 30. With this structure, the C-arm rotating mechanism 50 drives the main shaft 20 to rotate, and the X-ray tube arm rotating mechanism 30 is mounted on the main shaft 20 and can rotate around the main shaft 20. The detector arm 40 is rigidly connected to the main shaft 20 and will rotate with the rotation of the main shaft 20. This results in two independent rotating systems, which rotate the C-arm and the X-ray tube arm 60 respectively, which has beneficial effects on the electrical control logic and structural stability. The C-arm rotating mechanism 50 includes a worm gear 521, a worm 513, and a limiting ring 526. One end of the main shaft 20 is rotatably mounted on the trolley plate 10 via a tapered bearing 525. The limiting ring 526 is sleeved on one end of the main shaft 20. In this embodiment, the limiting ring 526 is rotatably sleeved on one end of the main shaft 20 via a spacer 529. The thickness of the spacer 529 is greater than the thickness of the limiting ring 526, which can axially position the worm gear 521 while ensuring that the limiting ring 526 can rotate flexibly on its surface. The limiting ring 526 has a limiting protrusion 526a, on which a limiting pin 5 is fixed. 27. An arc-shaped groove 10a is provided on the trolley plate 10, and the limiting pin 527 is located in the arc-shaped groove 10a. The worm gear 521 is fixed to one end of the main shaft 20. The side of the worm gear 521 is fixed with a limiting block 524 that cooperates with the limiting protrusion 526a. The limiting block 524 can abut against both sides of the limiting protrusion 526a. With this structure, the limiting block 524, the limiting ring 526 and the arc-shaped groove 10a on the trolley plate 10 together form a mechanical limiting of the C-arm rotation. Due to the cooperation of the limiting pin 527 and the arc-shaped groove 10a, a mechanical limiting rotation of more than ±180° can be achieved. Worm gear 513 is horizontally rotatably mounted on trolley plate 10, and worm gear 513 meshes with worm wheel 521, forming a self-locking structure. Worm gear 513 is also connected to a drive assembly that enables its rotation. In this example, brake bracket 511 is fixed on trolley plate 10, and there is an adjusting shim 515 between brake bracket 511 and trolley plate 10. The adjusting shim 515 is used to adjust the gap between the brake suction cups in brake 512 to ensure flexible and reliable engagement and disengagement. Brake 512 is installed between brake bracket 511 and one end of main shaft 20. Brake bracket 511, adjusting shim 515, and brake 512 together form a brake module, which is a redundant design that improves positioning accuracy and safety when C-arm rotates. It locks when main shaft 20 stops rotating and releases when main shaft 20 starts rotating.

[0022] The CVT arm rotation mechanism 30 includes a second worm gear 320, a second worm 318, and two limiting blocks 313. The main shaft 20 is rotatably connected to the CVT arm 60 via a second tapered bearing 302. Bearing seats 303 that mate with the second tapered bearing 302 are fixed on both sides of the CVT arm 60. In this embodiment, an adjusting washer 327 is provided between one of the bearing seats 303 and the CVT arm 60. By adding or removing the adjusting washer 327, the axial and radial clearances of the CVT arm 60 relative to the main shaft 20 can be eliminated. In this example, two bushings 322 are also fitted in the middle of the main shaft 20, and the bushings 322 are arranged between the second tapered bearing 302 and the second worm gear 320. The two limiting blocks 313... The worm gear 320 is fixed to the middle of the main shaft 20, and a limiting block 321 that cooperates with the limiting block 313 is fixed to the side of the worm gear 320. In this embodiment, the limiting block 321 is installed on the worm gear 320 and the limiting block 313 is installed on the worm gear 60, thus forming a mechanical limiting module for the rotation of the worm gear 60. In practice, the limiting block 321 and the limiting block 313 can be changed to change the angle of mechanical limiting. The worm gear 318 is horizontally rotatably installed on the worm gear 60 and meshes with the worm gear 320, and the two form a self-locking structure. The worm gear 318 is also connected to a drive component 2 that enables it to rotate.

[0023] The drive assembly 1 includes a motor 520, a drive wheel 517, a driven wheel 514, and a transmission belt 516. The motor 520 is fixed to the trolley plate 10 via a motor mounting base 518. The trolley plate 10 has a fine-tuning structure 519 for fine-tuning the position of the motor mounting base 518. In this embodiment, the fine-tuning structure 519 adopts an existing structure, thereby realizing the tension adjustment of the transmission belt 516. The drive wheel 517 is fixed on the output shaft of the motor 520, the driven wheel 514 is fixed on the worm gear 513, and the transmission belt 516 is sleeved between the drive wheel 517 and the driven wheel 514. With this structure, the motor 520, the drive wheel 517, the driven wheel 514, and the transmission belt 516 together form the drive assembly 1, which is installed on the trolley plate 10 to drive the rotation of the worm gear 513.

[0024] An encoder bracket 502, a potentiometer bracket 506, and a photoelectric bracket 503 are fixed on the trolley plate 10. An encoder 501 is fixed on the encoder bracket 502, and an encoder pinion 504 is fixed on the shaft of the encoder 501. A potentiometer 505 is fixed on the potentiometer bracket 506, and a potentiometer pinion 507 is fixed on the shaft of the potentiometer 505. A photoelectric switch 508 is fixed on the photoelectric bracket 503. A large gear 509, which meshes with both the encoder pinion 504 and the potentiometer pinion 507, is fixed to one end of the main shaft 20. A photoelectric retaining ring 510 is provided to cooperate with photoelectric switch 508. With this structure, encoder pinion 504, encoder bracket 502, and encoder 501 together form a C-arm position information acquisition module. The signal is transmitted from large gear 509 to encoder pinion 504 to realize real-time position reading of rotation. Photoelectric bracket 503, potentiometer pinion 507, potentiometer bracket 506, potentiometer 505, and photoelectric switch together form an electrical limit module. Through the position information output of potentiometer pinion 507 and photoelectric retaining ring 510, electronic limit function of extreme position can be performed.

[0025] One end of the spindle 20 is threaded with a round nut 523, and a retaining washer 528 is provided between the round nut 523 and the worm gear 521; the middle part of the spindle 20 is threaded with a round nut 309, and a retaining washer 319 is provided between the round nut 309 and the bearing housing 303; by using the round nut 523, the round nut 309, the retaining washer 528 and the retaining washer 319, and in conjunction with the arrangement of the double-sided tapered bearings 532 and 325 on the spindle 20, the axial and radial clearances of the spindle 20 can be eliminated.

[0026] The trolley plate 10 is equipped with a worm gear seat 522. Both ends of the worm gear 513 are rotatably connected to the worm gear seat 522 via double-sided tapered bearings 532. Worm end caps 533 are fixed on both sides of the worm gear seat 522. A worm adjusting shim 530 is also installed on the side of the worm gear seat 522 away from the driven wheel 514. The arrangement of the double-sided tapered bearings 532 allows the axial and radial clearance of the worm gear 513 to be controlled by adding or removing the worm adjusting shim 530, thereby improving the transmission accuracy between the worm wheel 521 and the worm gear 513. The trolley plate 10 is equipped with a clearance adjusting block 531 for adjusting the meshing clearance between the worm gear 513 and the worm wheel 521. With this structure, the clearance adjusting block 531 is installed on the trolley plate 10, which can adjust the meshing clearance between the worm gear 513 and the worm wheel 521, so that the rotational clearance and accuracy of the worm wheel 521 can be adjusted and controlled.

[0027] The second drive assembly includes a second motor 312, a second drive wheel 315, a second driven wheel 317, and a second transmission belt 316. The second motor 312 is fixed to the X-ray tube arm 60 via a second motor mounting base 326. The second drive wheel 315 is fixed to the output shaft of the second motor 312. The second driven wheel 317 is fixed to the second worm gear 318. The second transmission belt 316 is sleeved between the second drive wheel 315 and the second driven wheel 317. In this embodiment, an adjustment knob 301 is also fixed on the second worm gear 318. The adjustment knob 301 can manually adjust the rotation angle of the X-ray tube arm 60, which is very convenient for maintenance during power outages.

[0028] The CVT arm 60 is equipped with a worm gear seat 324. Both ends of the worm gear 318 are rotatably connected to the worm gear seat 324 via double-sided tapered bearings 325. Worm end caps 323 are fixed on both sides of the worm gear seat 324. The CVT arm 60 has a fine-tuning structure 314 for fine-tuning the position of the worm gear seat 324 and the position of the motor mounting seat 326. The fine-tuning structure 314 adopts an existing structure and can adjust the meshing clearance between the worm gear 318 and the worm wheel 320, as well as the tension of the transmission belt 316.

[0029] An encoder bracket 2 307 and a photoelectric bracket 2 305 are fixed on the X-ray tube arm 60. An encoder 2 306 is fixed on the encoder bracket 2 307. An encoder pinion 2 308 is fixed on the shaft of the encoder 2 306. A photoelectric switch 2 304 is fixed on the photoelectric bracket 2 305. A large gear 2 311 that meshes with the encoder pinion 2 308 is fixed on the worm gear 2 320. A photoelectric recognition ring 310 that cooperates with the photoelectric switch 2 304 is fixed on the worm gear 2 320. With this structure, the photoelectric switch 2 304, the photoelectric bracket 2 305, and the photoelectric recognition ring 310 together form a photoelectric limit module, which can perform photoelectric limit of extreme positions and zero position recognition. The encoder bracket 2 307, the encoder pinion 2 308, and the large gear 2 311 together form a position information acquisition module for X-ray tube arm 60, which is used to read the rotation position information of X-ray tube arm 60 in real time.

[0030] In summary, the design details of both the C-arm rotation and the 60° rotation of the tube arm lie in the fact that both the worm gear and worm have modules for adjusting the clearance accuracy. They are also equipped with auxiliary modules such as mechanical limiters, photoelectric limiters, position information acquisition, and safety brakes to ensure the safety and reliability of the rotational motion.

[0031] This high-precision rotation system is particularly suitable for 3D imaging mammography machines with tomo functionality, and is applied to the independent rotation of the X-ray tube arm 60° and the independent rotation of the C-arm, respectively.

[0032] In this embodiment, the C-arm rotation angle is shown as ±180°. If a larger rotation angle is required, it can be achieved by adjusting the corresponding parameters. The 60° swing angle of the X-ray tube arm is shown as ±60°, which is already greater than the ±50° currently on the market. However, if a larger rotation angle is required, it can also be achieved by adjusting the corresponding parameters. In practice, high-precision rotation systems also include a rotation balancing mechanism.

[0033] All of the above components are general standard parts or components known to those skilled in the art. Their structure and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0034] The above embodiments and figures are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A high-precision rotating system for a mammography machine, the mammography machine comprising a trolley plate (10), a main shaft (20), a X-ray tube arm (60), and a detector arm (40), characterized in that, The high-precision rotation system includes a C-arm rotation mechanism (50) and a X-ray tube arm rotation mechanism (30). One end of the main shaft (20) is mounted on the trolley plate (10) via the C-arm rotation mechanism (50), and the other end of the main shaft (20) is fixedly connected to the detector arm (40). The X-ray tube arm (60) is mounted in the middle of the main shaft (20) via the X-ray tube arm rotation mechanism (30). The main shaft (20) is a hollow shaft. The C-arm rotation mechanism (50) includes a worm gear (521), a worm (513), and a limiting ring (526). One end of the main shaft (20) is connected to a tapered bearing. (525) Rotatably mounted on the trolley plate (10), the limiting ring (526) is sleeved on one end of the main shaft (20), the limiting ring (526) has a limiting protrusion (526a), the limiting protrusion (526a) is fixed with a limiting pin (527), the trolley plate (10) is provided with an arc groove (10a), and the limiting pin (527) is located in the arc groove (10a), the worm gear (521) is fixed on one end of the main shaft (20), and the side of the worm gear (521) is fixed with a limiting block (524) that cooperates with the limiting protrusion (526a). The limiting block (524) can abut against both sides of the limiting protrusion (526a). The worm gear (513) is horizontally rotatably mounted on the trolley plate (10), and the worm gear (513) meshes with the worm wheel (521). The worm gear (513) is also connected to a drive assembly that can rotate it. The ball tube arm rotation mechanism (30) includes a worm wheel (320), a worm gear (318), and two limiting blocks (313). The main shaft (20) is rotatably connected to the ball tube arm (60) through a tapered bearing (302). The ball tube arm (60) 0) Both sides are fixed with bearing seats (303) that cooperate with tapered bearing two (302). The two limiting blocks (313) are fixed on the ball tube arm (60). The worm gear two (320) is fixed in the middle of the main shaft (20). The side of the worm gear two (320) is fixed with limiting block two (321) that cooperates with limiting block (313). The worm gear two (318) is horizontally rotatably mounted on the ball tube arm (60) and the worm gear two (318) meshes with the worm gear two (320). The worm gear two (318) is also connected to a drive assembly two that can make it rotate.

2. The high-precision rotating system of the mammography machine according to claim 1, characterized in that, The drive assembly includes a motor (520), a drive wheel (517), a driven wheel (514), and a transmission belt (516). The motor (520) is fixed on the trolley plate (10) by a motor mounting seat (518). The trolley plate (10) has a fine-tuning structure (519) for fine-tuning the position of the motor mounting seat (518). The drive wheel (517) is fixed on the output shaft of the motor (520). The driven wheel (514) is fixed on the worm gear (513). The transmission belt (516) is sleeved between the drive wheel (517) and the driven wheel (514).

3. The high-precision rotating system of the mammography machine according to claim 1, characterized in that, The slide plate (10) is respectively fixed with an encoder bracket (502), a potentiometer bracket (506) and a photoelectric bracket (503). The encoder bracket (502) is fixed with an encoder (501). The encoder pinion (504) is fixed on the shaft of the encoder (501). The potentiometer (505) is fixed on the potentiometer bracket (506). The potentiometer pinion (507) is fixed on the shaft of the potentiometer (505). The photoelectric bracket (503) is fixed with a photoelectric switch (508). One end of the main shaft (20) is fixed with a large gear (509) that meshes with the encoder pinion (504) and the potentiometer pinion (507). One end of the main shaft (20) is fixed with a photoelectric retaining ring (510) that cooperates with the photoelectric switch (508).

4. The high-precision rotating system of the mammography machine according to claim 1, characterized in that, One end of the main shaft (20) is threaded with a round nut (523), and a backstop washer (528) is provided between the round nut (523) and the worm gear (521).

5. The high-precision rotating system of the mammography machine according to claim 1, characterized in that, The trolley plate (10) is equipped with a worm seat (522). Both ends of the worm (513) are rotatably connected to the worm seat (522) via a double-sided tapered bearing (532). Worm end caps (533) are fixed on both sides of the worm seat (522). A worm adjusting pad (530) is also installed on the side of the worm seat (522) away from the driven wheel (514). A clearance adjusting block (531) for adjusting the meshing clearance between the worm (513) and the worm wheel (521) is installed on the trolley plate (10).

6. The high-precision rotating system of the mammography machine according to claim 1, characterized in that, The second drive assembly includes a second motor (312), a second drive wheel (315), a second driven wheel (317), and a second transmission belt (316). The second motor (312) is fixed on the tube arm (60) via a second motor mounting seat (326). The second drive wheel (315) is fixed on the output shaft of the second motor (312). The second driven wheel (317) is fixed on the second worm gear (318). The second transmission belt (316) is sleeved between the second drive wheel (315) and the second driven wheel (317).

7. The high-precision rotating system of the mammography machine according to claim 4, characterized in that, The spindle (20) is threaded with a round nut (309) in the middle, and a retaining washer (319) is provided between the round nut (309) and the bearing seat (303).

8. The high-precision rotating system of the mammography machine according to claim 1, characterized in that, The ball tube arm (60) is equipped with a worm gear seat two (324), and both ends of the worm gear two (318) are rotatably connected to the worm gear seat two (324) through a double-sided tapered bearing two (325). Both sides of the worm gear seat two (324) are fixed with worm end cap two (323). The ball tube arm (60) has a fine-tuning structure two (314) for fine-tuning the position of the worm gear seat two (324) and the position of the motor mounting seat two (326).

9. The high-precision rotating system of the mammography machine according to claim 1, characterized in that, The X-ray tube arm (60) is fixed with an encoder bracket two (307) and a photoelectric bracket two (305). The encoder bracket two (307) is fixed with an encoder two (306). The encoder pinion two (308) is fixed on the shaft of the encoder two (306). The photoelectric bracket two (305) is fixed with a photoelectric switch two (304). The worm gear two (320) is fixed with a large gear two (311) that meshes with the encoder pinion two (308). The worm gear two (320) is fixed with a photoelectric recognition ring (310) that cooperates with the photoelectric switch two (304).

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