Transmission device and scanning bed

Abstract

This application discloses a transmission device and a scanning bed. The transmission device is applied to the scanning bed and includes a rotating shaft and a transmission component. The rotating shaft has a spirally extending groove on its peripheral sidewall. The transmission component is sleeved on the rotating shaft, and its inner sidewall includes a first inner wall and a second inner wall, which are arranged axially along the rotating shaft. The first inner wall has a spiral groove, and a ball bearing assembly is disposed between the spiral groove and the groove. The second inner wall has mating teeth that mesh with the groove. When the rotating shaft rotates, the ball bearing assembly rolls between the groove and the spiral groove, and the mating teeth slide along the groove, thereby driving the transmission component to move axially along the rotating shaft. This embodiment effectively simplifies the structure and improves self-locking performance, achieving smooth lifting and lowering of the bed plate through the linkage between the transmission component and the rotating shaft.

Description

Technical Field

[0001] This application relates to the field of CT scanning bed lifting technology, and more particularly to a transmission device and a scanning bed. Background Technology

[0002] During CT scanning, the scanning bed requires height control to ensure the patient can accurately enter the scanning area after being raised and lowered to the clinical position. In related technologies, CT scanning beds typically use a motor-driven lead screw to raise and lower the bed platform. However, some motor-driven lead screw solutions require an additional self-locking device to prevent the bed platform from slipping under load after raising and lowering stops. This complicates the overall structure and increases maintenance costs. Utility Model Content

[0003] This application provides a transmission device and a scanning bed, which can effectively simplify the structure and improve the self-locking performance. The smooth lifting and lowering of the bed board is achieved through the linkage between the transmission component and the rotating shaft.

[0004] In a first aspect, embodiments of this application provide a transmission device applied to a scanning bed, comprising: A rotating shaft, wherein a spirally extending groove is provided on the peripheral sidewall of the rotating shaft; A transmission component is sleeved on the rotating shaft. The inner sidewall of the transmission component includes a first inner wall and a second inner wall, which are arranged along the axial direction of the rotating shaft. A spiral groove is provided on the first inner wall, and a ball set is provided between the spiral groove and the groove. A mating tooth is provided on the second inner wall, and the mating tooth meshes with the groove. When the rotating shaft rotates, the ball assembly rolls between the groove and the helical groove, and the mating teeth slide along the groove to drive the transmission component to move axially along the rotating shaft.

[0005] In some embodiments of this application, the cross-section of the mating tooth is trapezoidal, and the mating tooth includes a first end and a second end disposed opposite to each other. The first end is connected to the second inner wall, and the width of the first end is greater than the width of the second end.

[0006] In some embodiments of this application, the groove wall includes a first sidewall, a second sidewall, and a third sidewall connected in sequence. The first sidewall and the third sidewall are inclined relative to each other, and the inclination directions of the first sidewall and the third sidewall are opposite. The inclination angles of the first sidewall and the third sidewall relative to a first direction are the same. The first direction is perpendicular to the axial direction of the rotating shaft. Both the first sidewall and the third sidewall are used to contact the mating teeth.

[0007] In some embodiments of this application, the inclination angle of the first sidewall and the third sidewall relative to the first direction is α, where α satisfies 20°≤α≤40°.

[0008] In some embodiments of this application, the second sidewall is an arc surface, and the ball assembly contacts the second sidewall.

[0009] In some embodiments of this application, the groove has multiple spaced slots in its orthographic projection onto a first plane, and the first plane is parallel to the axial direction of the rotation axis. The spiral groove, when projected onto the first plane, has a first slot and a second slot spaced apart, and the first slot and the second slot are respectively connected to different sub-slots.

[0010] In some embodiments of this application, the transmission component includes a first portion and a second portion, the first portion including a first inner wall, the second portion including a second inner wall, and the first portion and the second portion being integrally formed.

[0011] In some embodiments of this application, the transmission device further includes: A driving component, wherein the output shaft of the driving component is connected to the rotating shaft, and the driving component is used to drive the rotating shaft to rotate; A braking element, electrically connected to the driving element, is used to lock the rotation of the output shaft when power is off; A speed reducer is disposed between the drive component and the rotating shaft. The speed reducer is used to reduce the rotational speed of the rotating shaft and increase the output torque.

[0012] Secondly, embodiments of this application also provide a scanning bed, comprising: Base; A bed board, wherein a lifting bracket is provided on the side of the bed board facing the base, and the first end of the lifting bracket is rotatably connected to the bed board; As described in any of the above embodiments, the rotating shaft is connected to the base, the transmission component is rotatably connected to the second end of the lifting bracket, and the transmission component is used to drive the lifting bracket to rotate relative to the base and the bed board, so as to drive the bed board to move vertically.

[0013] In some embodiments of this application, multiple lifting brackets are provided, and the multiple lifting brackets are spaced apart on the side of the bed board facing the base; The transmission device includes a plurality of transmission components, each of which is connected to one of the lifting brackets.

[0014] Based on the transmission device and scanning bed in this application embodiment, this embodiment achieves low-friction rolling transmission by simultaneously setting helical grooves and mating teeth on the transmission component and utilizing ball bearings. At the same time, the meshing of the mating teeth and grooves can effectively prevent the transmission component from slipping due to inertia when there is no power input, ensuring that the device connected to the transmission component can be reliably positioned when stopped at any position, avoiding accidental slippage caused by inertia or load changes. In other words, the self-locking performance of the transmission component can be achieved by relying on the meshing of the mating teeth and grooves, without the need to add additional self-locking components. This not only improves the transmission efficiency and system reliability of the transmission device, but also helps to reduce the complexity of the overall structure and maintenance cost of the transmission device. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional structural diagram of the transmission device in one embodiment of this application; Figure 2 for Figure 1 Enlarged structural diagram at point A; Figure 3 for Figure 1 Enlarged structural diagram at point B; Figure 4 This is a schematic diagram of the scanning bed structure in one embodiment of this application; Figure 5 This is a schematic diagram showing the disassembled structure of the scanning bed in one embodiment of this application.

[0017] Figure label: 100. Transmission device; 10. Rotating shaft; 11. Groove; 111. First sidewall; 112. Second sidewall; 113. Third sidewall; 114. Dividing groove; 20. Transmission component; 21. First section; 211. First inner wall; 22. Second section; 221. Second inner wall; 23. Spiral groove; 231. First groove opening; 232. Second groove opening; 24. Ball bearing assembly; 25. Mating gear; 251. First end; 252. Second end; 200. Scanning bed; 30. Base; 31. Guide rail; 40. Bed board; 41. Lifting bracket; 42. Slider assembly; 421. Slider; 422. Fixture; 43. Auxiliary bracket; 51. Driving component; 52. Braking component; 53. Reducer. Detailed Implementation

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, a clear and complete description will be provided below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] In related technologies, CT scanning beds typically use a motor-driven lead screw to raise and lower the bed platform. However, some motor-driven lead screw solutions require an additional self-locking device to prevent the bed platform from slipping under load after the raising and lowering stops, thus complicating the overall structure and increasing maintenance costs. Furthermore, some CT scanning beds use a worm gear transmission structure, but the worm gear structure has a limited raising and lowering range, and the lowest position of the bed is too high, failing to meet the clinical needs of CT scanning beds.

[0020] Regarding the above situation, firstly, please refer to [link / reference needed]. Figures 1-3 This application proposes a transmission device 100 applied to a scanning bed 200. The transmission device 100 includes a rotating shaft 10 and a transmission component 20.

[0021] The rotating shaft 10 has a spirally extending groove 11 on its peripheral sidewall. A transmission component 20 is sleeved on the rotating shaft 10. The inner sidewall of the transmission component 20 includes a first inner wall 211 and a second inner wall 221, which are arranged along the axial direction of the rotating shaft 10. A spiral groove 23 is provided on the first inner wall 211, and a ball assembly 24 is disposed between the spiral groove 23 and the groove 11. A mating tooth 25 is provided on the second inner wall 221, and the mating tooth 25 meshes with the groove 11. When the rotating shaft 10 rotates, the ball assembly 24 rolls between the groove 11 and the spiral groove 23, and the mating tooth 25 slides along the groove 11, thereby driving the transmission component 20 to move axially along the rotating shaft 10.

[0022] Specifically, when the rotating shaft 10 rotates, the ball assembly 24 achieves rolling transmission between the groove 11 and the helical groove 23, effectively reducing frictional resistance and improving transmission efficiency. Simultaneously, the mating teeth 25 mesh with and slide along the groove 11. This meshing structure not only ensures the stability of the transmission process but also provides a self-locking function when the transmission component 20 stops moving. The ball assembly 24 forms a circulating rolling path between the helical groove 23 and the groove 11, ensuring smooth and continuous transmission and preventing jamming. The ball assembly 24 includes multiple balls evenly distributed along the helical direction. As the transmission component 20 moves axially along the rotating shaft 10, the balls sequentially pass through the guide path of the helical groove 23 and the groove 11, achieving uninterrupted cyclic movement and ensuring transmission continuity and accuracy.

[0023] It should be noted that, in this embodiment of the application, by simultaneously providing a spiral groove 23 and a mating tooth 25 on the transmission component 20, low-friction rolling transmission is achieved using the ball assembly 24. At the same time, the meshing of the mating tooth 25 and the groove 11 can effectively prevent the transmission component 20 from slipping due to inertia when there is no power input, ensuring that the device connected to the transmission component 20 can be reliably positioned when stopped at any position, avoiding accidental slippage caused by inertia or load changes. In other words, the self-locking performance of the transmission component 20 can be achieved by relying on the meshing of the mating tooth 25 and the groove 11, without the need for additional self-locking components. This not only improves the transmission efficiency and system reliability of the transmission device 100, but also helps to reduce the complexity of the overall structure and maintenance cost of the transmission device 100.

[0024] Please see Figures 2-3 In some embodiments of this application, the orthographic projection of the groove 11 on the first plane has multiple slots 114 arranged at intervals, and the first plane is parallel to the axial direction of the rotation shaft 10; the orthographic projection of the spiral groove 23 on the first plane has a first slot 231 and a second slot 232 arranged at intervals, and the first slot 231 and the second slot 232 are respectively connected to different slots 114.

[0025] Understandably, the groove 11 extends spirally on the circumferential wall of the rotating shaft 10, and its helix angle matches the lead of the spiral groove 23, ensuring a smooth transition of the ball between the spiral groove 23 and the groove 11 and avoiding motion interference. The orthographic projection of the groove 11 on the first plane is shown as multiple parallel oblique lines. The first groove opening 231 and the second groove opening 232 are respectively aligned with two different sub-grooves 114 in the projection, so that the ball assembly 24 smoothly transitions between the spiral groove 23 and the different sub-grooves 114 under the guidance of the spiral groove 23, realizing the continuity of the axial movement of the transmission component 20.

[0026] Please see Figure 3In some embodiments of this application, the cross-section of the mating tooth 25 is trapezoidal. The mating tooth 25 includes a first end 251 and a second end 252 disposed opposite to each other. The first end 251 is connected to the second inner wall 221, and the width of the first end 251 is greater than the width of the second end 252.

[0027] Specifically, the trapezoidal mating teeth 25 enhance the meshing strength between the tooth surface and the groove 11, improving transmission stability and load-bearing capacity. Simultaneously, due to the wider first end 251 and narrower second end 252, the sides of the mating teeth 25 form a sloping guide structure. During the axial movement of the transmission component 20 along the rotating shaft 10, the sloping design of the mating teeth 25 facilitates smooth sliding and engagement within the groove 11, reducing impact and wear at the moment of engagement and improving transmission smoothness and service life. This structure, while ensuring efficient transmission, further enhances the self-locking reliability of the transmission device 100, improving the overall safety of the device.

[0028] Further, please see Figure 2 In some embodiments of this application, the groove wall of the groove 11 includes a first sidewall 111, a second sidewall 112 and a third sidewall 113 connected in sequence. The first sidewall 111 and the third sidewall 113 are inclined relative to each other, and the inclination directions of the first sidewall 111 and the third sidewall 113 are opposite. The inclination angles of the first sidewall 111 and the third sidewall 113 relative to the first direction are the same. The first direction is perpendicular to the axial direction of the rotating shaft 10. Both the first sidewall 111 and the third sidewall 113 are used to contact the mating teeth 25.

[0029] Specifically, the inclined structures of the first sidewall 111 and the third sidewall 113 are symmetrical, allowing them to closely engage with the inclined surface of the trapezoidal meshing tooth 25. This ensures a uniform distribution of contact stress during transmission, preventing localized stress concentration and further enhancing meshing stability and wear resistance. Simultaneously, the symmetrical groove wall structure maintains consistent meshing characteristics during both forward and reverse rotation of the transmission component 20, effectively reducing backlash caused by direction switching and improving dynamic response accuracy.

[0030] Furthermore, the inclination angles of the first sidewall 111 and the third sidewall 113 relative to the first direction are both α, where α satisfies 20°≤α≤40°. This angle range ensures sufficient frictional resistance between the meshing surfaces to achieve self-locking, while avoiding assembly difficulties or stress concentration due to excessive inclination. The design of the α angle balances meshing efficiency and assembly manufacturability, ensuring effective locking between the transmission component 20 and the groove 11 while reducing frictional losses of the mating teeth 25 during relative sliding.

[0031] Furthermore, such as Figure 2As shown, the second sidewall 112 has an arcuate surface, and the ball assembly 24 contacts the second sidewall 112. It can be understood that the second sidewall 112 is the bottom wall of the groove 11. The arcuate surface allows for better contact with the outer circumference of the ball assembly 24, resulting in smoother contact as the balls roll within the groove 11, reducing rolling resistance and localized wear. This arcuate structure also effectively disperses the contact stress between the balls and the groove wall, improving load uniformity and extending the service life of the transmission device 100. Simultaneously, during the axial movement of the transmission component 20, the arcuate second sidewall 112 helps guide the ball assembly 24 to roll smoothly, preventing jamming or misalignment, further enhancing the stability and response accuracy of the transmission.

[0032] Please see Figure 1 and Figure 3 In some embodiments of this application, the transmission component 20 includes a first portion 21 and a second portion 22. The first portion 21 includes a first inner wall 211, and the second portion 22 includes a second inner wall 221. The first portion 21 and the second portion 22 are integrally formed.

[0033] Specifically, the first part 21 and the second part 22 are constructed using an integral molding process to ensure structural strength and coaxiality accuracy, and reduce the impact of assembly errors on transmission performance. The first part 21 has a first through hole, through which it is fitted onto the outer periphery of the rotating shaft 10. The inner circumferential surface of the first through hole is the first inner wall 211. The second part 22 has a second through hole, through which it is fitted onto the outer periphery of the rotating shaft 10. The inner circumferential surface of the second through hole is the second inner wall 221. The first inner wall 211 and the second inner wall 221 together constitute the inner sidewall of the transmission component 20. In other words, the first inner wall 211 and the second inner wall 221 are an integral structure and transition continuously along the axial direction without steps or gaps, which helps to ensure the stable support and precise positioning of the transmission component 20 on the rotating shaft 10.

[0034] Secondly, please see Figures 4-5 This application also provides a scanning bed 200, including a base 30, a bed board 40, and a transmission device 100 as described in any of the above embodiments. A lifting bracket 41 is provided on the side of the bed board 40 facing the base 30. The first end of the lifting bracket 41 is rotatably connected to the bed board 40. The rotating shaft 10 is connected to the base 30, and the transmission component 20 is rotatably connected to the second end of the lifting bracket 41. The transmission component 20 is used to drive the lifting bracket 41 to rotate relative to the base 30 and the bed board 40, so as to drive the bed board 40 to move vertically.

[0035] Specifically, the transmission device 100 is housed within the base 30. The rotating shaft 10 is driven to rotate by the drive component 51. The transmission component 20 moves axially under the synergistic action of the ball bearing assembly 24 and the groove 11, thereby driving the second end of the lifting bracket 41 to move synchronously and causing the first end of the lifting bracket 41 to rotate, thus achieving smooth lifting and lowering of the bed board 40. Through the precise engagement of the ball bearing assembly 24 and the groove 11, and the mating teeth 25 and the groove 11, the driving force is effectively transmitted and the self-locking performance of the transmission device 100 is increased. This controls the swaying and jamming of the bed board 40 during the lifting and lowering process, improving the smoothness of movement and positional accuracy.

[0036] In some embodiments, such as Figure 5 As shown, an auxiliary support 43 is also provided on the side of the bed board 40 facing the base 30. The middle part of the auxiliary support 43 is rotatably connected to the middle part of the lifting support 41 through a rotating shaft. The two ends of the auxiliary support 43 are respectively hinged to the bed board 40 and the base 30 to form a cross linkage structure. When the transmission component 20 drives the second end of the lifting support 41 to move along the axial direction of the transmission shaft, the auxiliary support 43 and the lifting support 41 work together to keep the bed board 40 in a horizontal position during the lifting process, further constraining the movement trajectory of the bed board 40, preventing the bed board 40 from shifting or tilting due to unilateral force during the lifting process, and effectively improving the stability and parallelism of the lifting of the bed board 40.

[0037] In some embodiments, such as Figure 5 As shown, a guide rail 31 is provided on the base 30, and the extension direction of the guide rail 31 is parallel to the extension direction of the transmission shaft. A slider 421 assembly 42 is provided on the lifting bracket 41. The slider 421 assembly 42 includes a slider 421 and a fixing member 422 connected to each other. The slider 421 slides with the guide rail 31, and the fixing member 422 is fixed to the transmission member 20. When the fixing member 422 moves along the axial direction of the transmission shaft with the transmission member 20, it can drive the slider 421 to slide synchronously on the guide rail 31, thereby ensuring that the lifting bracket 41 moves stably along the preset trajectory and avoiding lateral deviation or torsion.

[0038] In some embodiments of this application, multiple lifting brackets 41 are provided, and the multiple lifting brackets 41 are spaced apart on the side of the bed board 40 facing the base 30; the transmission device 100 includes multiple transmission components 20, and each transmission component 20 is connected to one lifting bracket 41 in a transmission connection.

[0039] Understandably, the multiple lifting supports 41 and their corresponding transmission components 20 work together to achieve synchronous lifting of the bed board 40 at multiple points, significantly improving the overall load-bearing capacity and movement stability. This application utilizes the inherent characteristics of the mechanical structure to achieve a self-locking function through the coordinated operation of the transmission device 100 and the multiple lifting supports 41, eliminating the need for additional self-locking components. This effectively improves transmission efficiency and system reliability while reducing the complexity of the overall structure and maintenance costs.

[0040] Please see Figure 5 In some embodiments of this application, the base 30 is further provided with a drive member 51, a brake member 52 and a reducer 53. The output shaft of the drive member 51 is connected to the rotating shaft 10, and the drive member 51 is used to drive the rotating shaft 10 to rotate. The brake member 52 is electrically connected to the drive member 51 and is used to lock the rotation of the output shaft when the power is off. The reducer 53 is disposed between the drive member 51 and the rotating shaft 10, and the reducer 53 is used to reduce the rotational speed of the rotating shaft 10 and increase the output torque.

[0041] Specifically, the reducer 53, through gear ratio adjustment, converts the high-speed, low-torque output of the drive component 51 into low-speed, high-torque power to meet the smooth operation requirements of the transmission component 20 under different load conditions. Simultaneously, the brake 52 is rapidly activated in case of power failure or emergency, locking the output shaft of the drive component 51 to prevent the rotating shaft 10 from rotating in reverse or due to inertia, thus enhancing system safety. The drive component 51, reducer 53, and brake 52 work together to not only improve the control accuracy and response speed of the transmission device 100 but also effectively ensure the stable operation of the equipment under complex working conditions. The drive component 51 can be a servo motor or a stepper motor to achieve precise position control and speed adjustment; the reducer 53 can be a planetary gear structure, combining high transmission efficiency with a compact layout; and the brake 52 can be an electromagnetic power-off brake to ensure immediate braking in case of power failure.

[0042] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0043] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A transmission device, characterized in that, Applications to scanning beds include: A rotating shaft, wherein a spirally extending groove is provided on the peripheral sidewall of the rotating shaft; A transmission component is sleeved on the rotating shaft. The inner sidewall of the transmission component includes a first inner wall and a second inner wall. The first inner wall and the second inner wall are arranged along the axial direction of the rotating shaft. A spiral groove is provided on the first inner wall. A ball set is provided between the spiral groove and the groove. A mating tooth is provided on the second inner wall. The mating tooth meshes with the groove. When the rotating shaft rotates, the ball assembly rolls between the groove and the spiral groove, and the mating teeth slide along the groove to drive the transmission component to move axially along the rotating shaft.

2. The transmission device according to claim 1, characterized in that, The cross-section of the mating tooth is trapezoidal, and the mating tooth includes a first end and a second end that are arranged opposite to each other. The first end is connected to the second inner wall, and the width of the first end is greater than the width of the second end.

3. The transmission device according to claim 2, characterized in that, The groove wall includes a first sidewall, a second sidewall, and a third sidewall connected in sequence. The first sidewall and the third sidewall are inclined relative to each other, and the inclination directions of the first sidewall and the third sidewall are opposite. The inclination angles of the first sidewall and the third sidewall relative to a first direction are the same. The first direction is perpendicular to the axial direction of the rotating shaft. Both the first sidewall and the third sidewall are used to contact the mating teeth.

4. The transmission device according to claim 3, characterized in that, The inclination angle of the first sidewall and the third sidewall relative to the first direction is α, where α satisfies 20°≤α≤40°.

5. The transmission device according to claim 3, characterized in that, The second sidewall is an arc surface, and the ball bearing assembly is in contact with the second sidewall.

6. The transmission device according to claim 1, characterized in that, The groove has multiple slots arranged at intervals in its orthographic projection onto the first plane, and the first plane is parallel to the axial direction of the rotation axis. The spiral groove, when projected onto the first plane, has a first slot and a second slot spaced apart, and the first slot and the second slot are respectively connected to different sub-slots.

7. The transmission device according to claim 1, characterized in that, The transmission component includes a first part and a second part. The first part includes a first inner wall, and the second part includes a second inner wall. The first part and the second part are integrally formed.

8. A scanning bed, characterized in that, include: Base; A bed board, wherein a lifting bracket is provided on the side of the bed board facing the base, and the first end of the lifting bracket is rotatably connected to the bed board; According to any one of claims 1 to 7, the rotating shaft is connected to the base, the transmission member is rotatably connected to the second end of the lifting bracket, and the transmission member is used to drive the lifting bracket to rotate relative to the base and the bed board, so as to drive the bed board to move vertically.

9. The scanning bed according to claim 8, characterized in that, Multiple lifting brackets are provided, and the multiple lifting brackets are spaced apart on the side of the bed board facing the base; The transmission device includes a plurality of transmission components, each of which is connected to one of the lifting brackets.

10. The scanning bed according to claim 9, characterized in that, The base is also provided with a drive component, a brake component, and a reducer. The output shaft of the drive component is connected to the rotating shaft, and the drive component is used to drive the rotating shaft to rotate. The brake component is electrically connected to the drive component and is used to lock the rotation of the output shaft when the power is off. The speed reducer is disposed between the drive component and the rotating shaft, and the speed reducer is used to reduce the rotational speed of the rotating shaft and increase the output torque.

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