Hand-cranking structure for driving traction wheel and magnetic resonance bed body moving and positioning system

Abstract

The utility model relates to a hand-cranking structure for driving a traction wheel and a magnetic resonance bed body moving and positioning system. The hand-cranking structure for driving the traction wheel comprises a hand-cranking wheel assembly, a spin lock assembly and a swing arm, the hand-cranking wheel assembly comprises a rotating hand wheel and a gear arranged on the rotating hand wheel, the rotating hand wheel is used for driving the gear to rotate in the circumferential direction when rotating, and the gear is connected with the traction wheel through a transmission connecting piece; the spin lock assembly comprises a rotary handle and a swing arm driving part arranged on the rotary handle, the rotary handle is used for driving the swing arm driving part to rotate in the circumferential direction during rotation, and the swing arm driving part is used for driving the swing arm to swing back and forth relative to the gear during rotation; the swing arm is meshed with the gear when swinging to a first position, and is separated from the gear when swinging to a second position; the overall structural design is reasonable, operation is easy, the traction wheel positioning function is achieved, the movement degree of the traction wheel can be accurately controlled, and the development, manufacturing, use and maintenance cost is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of magnetic resonance technology more specifically, relate to a hand shake structure and magnetic resonance bed body movement positioning system for traction wheel drive. BACKGROUND

[0002] With the development of magnetic resonance technology is increasingly mature, at present in superconducting magnetic resonance field, the vast majority of magnetic resonance bed body has adopted automatic system control, through the design of complicated transmission drive system to control the position of magnetic resonance bed body in the magnet of magnetic resonance magnet moves, although the automation degree is higher, but the structure is complex, the manufacturing requirement is high, the maintenance is difficult, when using, still need to consume great electric quantity, the use cost is high, therefore, usually only will be selected and applied in the resource sufficient, the scanning volume demand big hospital etc. Area, and in the resource relatively barren, the scanning volume demand is relatively low area, the automation degree demand of magnetic resonance bed body is not intense, so usually will consider using the simple manual drive structure based on traction wheel to realize the drive control to magnetic resonance bed body, but the manual drive structure in the prior art mostly is the way of directly using manual rotation traction wheel, not only is difficult to grasp the degree of force, also does not have the function of positioning locking, leading to the control of the moving distance of magnetic resonance bed body is often not accurate enough, needs to adjust many times, and the operation efficiency is low, therefore, still needs improvement and perfection. SUMMARY

[0003] The utility model provides a hand shake structure and magnetic resonance bed body movement positioning system for traction wheel drive to solve the technical problems of the prior art.

[0004] The utility model adopts the technical scheme that solves its technical problem:

[0005] On the one hand, the utility model provides a hand shake structure for traction wheel drive, the hand shake structure for traction wheel drive includes hand wheel subassembly, rotates lock subassembly and swing arm, the hand wheel subassembly includes rotary hand wheel and the gear that sets up on rotary hand wheel, the rotary hand wheel is used for when rotating to drive the gear circumferential rotation, the gear is connected with traction wheel through transmission connecting piece, the rotates lock subassembly includes rotary handle and the swing arm drive part that sets up on rotary handle, the rotary handle is used for when rotating to drive the swing arm drive part circumferential rotation, the swing arm drive part is used for when rotating to drive swing arm to and fro swing relative to the gear, when swing arm swings to the first position and is engaged with the gear, when swing arm swings to the second position and is separated from the gear.

[0006] In some embodiments, the rotating lock assembly further includes a brake lock piece connected to the rotating handle, the swing arm drive piece includes a shaft body and a shaft cap provided on the shaft body, and the end of the shaft body away from the shaft cap is provided on the brake lock piece. The shaft body abuts the lower end of the swing arm.

[0007] In some embodiments, the brake pad includes an upper connecting piece and a lower connecting piece integrally formed. A slot is provided at the position where the upper connecting piece and the lower connecting piece are connected, and the upper connecting piece is detachably connected to the rotating handle through the slot. The included angle between the upper connecting piece and the lower connecting piece is an obtuse angle. The shaft is perpendicularly disposed on one side of the upper connecting piece.

[0008] In some embodiments, the traction wheel drive hand-crank structure further includes a positioning plate disposed near the lower connecting piece, the positioning plate having a plurality of positioning holes spaced apart in a horizontal direction; the lower connecting piece is provided with positioning beads for fitting into the corresponding positioning holes.

[0009] In some embodiments, the lower connecting piece is further provided with a through hole, a locking pin is inserted into the through hole, a groove is provided on the side of the locking pin facing the positioning plate, a spring is provided in the groove, and the positioning bead is connected to the spring and partially protrudes from the groove.

[0010] In some embodiments, the swing arm includes a swing arm body and an extension arm. The swing arm body is configured to swing up and down. The extension arm is located on the side of the swing arm body near the gear and diagonally above the gear. The side of the extension arm opposite to the gear is provided with a rack for meshing with the gear.

[0011] In some embodiments, the swing arm body includes a support arm and a connecting arm; the support arm is in the shape of an inverted triangle, with the first end and the second end of the support arm both located above the third end; the first end of the support arm is integrally connected to the connecting arm, and the second end of the support arm is integrally connected to the extension arm; the upper part of the support arm is provided with a first arc-shaped through groove, and the side of the connecting arm away from the support arm is provided with a second arc-shaped through groove, and a plurality of swing connectors are inserted into both the first arc-shaped through groove and the second arc-shaped through groove.

[0012] In some embodiments, the connecting arm is further provided with a top plate and a limiting guide post, and the top plate is swaying up and down; the top plate is provided with an arc-shaped limiting guide groove, and the limiting guide post passes through the limiting guide groove; the upper part of the top plate is provided with a limiting block on one side near the connecting arm, and the limiting block is located above the connecting arm; the lower part of the top plate is provided with a first inclined surface, a second inclined surface, a plane and a third inclined surface arranged in a stepped manner from top to bottom, and the swing arm drive component abuts against the first inclined surface, the second inclined surface, the plane or the third inclined surface when the rotating handle rotates.

[0013] In some embodiments, the rotating handwheel has a connecting shaft in the middle, and a self-lubricating sleeve is fitted on the connecting shaft; the end of the connecting shaft away from the rotating handwheel is connected to a transmission connector.

[0014] In another aspect, the utility model provides a kind of magnetic resonance bed body moving positioning system, the magnetic resonance bed body moving positioning system includes the hand crank structure of traction wheel driving as any one of the above.

[0015] The utility model has the advantages that, different from the prior art, the hand crank structure of traction wheel driving of the utility model drives the traction wheel movement by the cooperation of rotating hand wheel and gear, and drives the swing arm to swing to the appropriate position relative to gear to position gear by the cooperation of rotating handle and swing arm driving element;So as to realize that swing arm swings to the first position and engages with gear, swing arm swings to the second position and is separated from gear, to realize accurate control of the movement degree of traction wheel;The overall structure is reasonable in design, easy to operate, has the function of positioning traction wheel, helps to accurately control the degree of movement of traction wheel, not only low in development and manufacturing cost, but also helps to reduce use and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the front side view schematic drawing of the hand crank structure of traction wheel driving in the utility model embodiment;

[0017] Figure 2 It is the rear side view schematic drawing of the hand crank structure of traction wheel driving in the utility model embodiment;

[0018] Figure 3 It is the exploded schematic drawing of the hand crank structure of traction wheel driving in the utility model embodiment;

[0019] Figure 4 It is the rear view schematic drawing of the hand crank structure of traction wheel driving in the utility model embodiment assembly in mounting plate;

[0020] Figure 5 It is the front view schematic drawing of the hand crank structure of traction wheel driving in the utility model embodiment assembly in mounting plate;

[0021] Figure 6 It is the application schematic drawing of the hand crank structure of traction wheel driving in the utility model embodiment;

[0022] Figure 7 It is the application schematic drawing of the traction wheel in the utility model embodiment;

[0023] Marked name and serial number in the figure: hand wheel assembly-1;Rotary lock assembly-2;Swing arm-3;Rotary hand wheel-11;Gear-12;Rotary handle-21;Swing arm drive-22;Brake lock piece-23;Shaft body-221;Shaft cap-222;Upper connecting piece-231;Lower connecting piece-232;Clamping groove-230;Positioning plate-4;Positioning hole-401;Positioning bead-5;Through hole-2320;Clamping column-6;Swing arm body-31;Extension arm-32;Rack-320;Supporting arm-311;Connecting arm-312;First arc-shaped through slot-3110;Second arc-shaped through slot-3120;Swing connecting piece-81;Mounting shaft-82;Top plate-91;Limiting guide column-92;Limiting guide groove-910;Limiting block-93;Connecting shaft-111;Self-lubricating sleeve-112;Transmission connecting piece-113;Magnetic resonance magnet-100;Magnetic resonance bed body-200;Intracavity stent-300;Traction wheel-10;Mounting plate-20;Driven wheel-30;Synchronous belt-40;Sliding seat-50. DETAILED DESCRIPTION

[0024] The terms "first", "second", "third", and "fourth" and the like in the description and in the claims of the present application and the accompanying drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. Moreover, the terms "include", and "have", and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a list of steps or units are not necessarily limited to the listed steps or units but can include additional steps or units not expressly listed or inherent to such process, method, system, product, or apparatus.

[0025] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0026] "Multiple" means two or more. "And / or", describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. The character " / " generally represents that the front and rear associated objects are in an "or" relationship.

[0027] Moreover, the terms "upper, lower, front, rear, left, right, upper end, lower end" and the like indicating the orientation are all with reference to the attitude position of the device or equipment described in the scheme in normal use.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] Example 1: This embodiment of the utility model provides a hand-cranked structure for driving the traction wheel, such as... Figures 1 to 3 As shown, the traction wheel drive hand crank structure includes a hand crank assembly 1, a rotary lock assembly 2, and a swing arm 3; the hand crank assembly 1 includes a rotating handwheel 11 and a gear 12 disposed on the rotating handwheel 11, the rotating handwheel 11 is used to drive the gear 12 to rotate circumferentially when rotating, and the gear 12 is connected to the traction wheel 10 through a transmission connector 113; the rotary lock assembly 2 includes a rotating handle 21 and a swing arm drive member 22 disposed on the rotating handle 21, the rotating handle 21 is used to drive the swing arm drive member 22 to rotate circumferentially when rotating, and the swing arm drive member 22 is used to drive the swing arm 3 to swing back and forth relative to the gear 12 when rotating; when the swing arm 3 swings to the first position, it engages with the gear 12, and when the swing arm 3 swings to the second position, it disengages from the gear 12.

[0030] The traction wheel drive of this utility model embodiment is a hand-cranked structure with a reasonable overall structure design and simple operation. It has the function of positioning the traction wheel 10, which helps to accurately control the degree of movement of the traction wheel 10. It not only has low development and manufacturing costs, but also helps to reduce the cost of use and maintenance.

[0031] For example, such as Figures 4 to 6As shown in the figure, the hand wheel assembly 1, the rotation lock assembly 2 and the swing arm 3 are all arranged on a mounting plate 20 for connecting with the magnetic resonance magnet 100, and the mounting plate 20 is vertically arranged. Specifically, as shown in the figure, the rotation handle 21 and the rotation hand wheel 11 are both rotationally arranged on the front side of the mounting plate 20, and the rotation handle 21 and the rotation hand wheel 11 are distributed in left and right directions. The front side of the mounting plate 20 is provided with corresponding LOCK and UNLOCK marks at the rotation handle 21; the front side of the mounting plate 20 is provided with a circular scale index 201 at the rotation hand wheel 11, which is convenient for confirming the rotation degree of the gear 12. The connecting end of the rotation handle 21 penetrates through the mounting plate 20 and is located on the rear side of the mounting plate 20, and the swing arm driving member 22 is located on the rear side of the mounting plate 20 to be connected with the connecting end of the rotation handle 21, so as to drive the swing arm driving member 22 to rotate synchronously through the rotation handle 21. The gear 12 is fixedly connected with the rotation hand wheel 11 and is located on the rear side of the mounting plate 20, and the swing arm 3 is also located on the rear side of the mounting plate 20. The swing arm 3 can be lifted up to swing upward relative to the gear 12 under the cooperation of the rotation handle 21 and the swing arm driving member 22, so as to be disengaged from the gear 12, or the swing arm 3 moves downward to engage with the gear 12, so as to position the gear 12.

[0032] As Figures 1 to 3 As shown in the figure, specifically, in the embodiment, the rotation lock assembly 2 further comprises a brake lock plate 23 connected with the rotation handle 21; the swing arm driving member 22 comprises a shaft body 221 and a shaft cap 222 arranged on the shaft body 221, and the end of the shaft body 221 away from the shaft cap 222 is arranged on the brake lock plate 23, for example, is threadedly detachably connected with the brake lock plate 23. The shaft body 221 abuts against the lower end of the swing arm 3, and the lower end of the swing arm 3 abuts against the shaft body 221 and is located between the shaft cap 222 and the brake lock plate 23. The brake lock plate 23 comprises an integrally connected upper connecting plate 231 and a lower connecting plate 232, and a clamping groove 230 is arranged at the position where the upper connecting plate 231 and the lower connecting plate 232 are integrally connected, so as to be detachably connected with the connecting end of the rotation handle 21, which is convenient for installation. The included angle between the upper connecting plate 231 and the lower connecting plate 232 is obtuse, so that the brake lock plate 23 can be switched to a suitable position with the rotation of the rotation handle 21; the shaft body 221 is vertically arranged on one side of the upper connecting plate 231, for example, is threadedly detachably connected with the upper connecting plate 231. The brake lock plate 23 rotates to drive the swing arm driving member 22 to rotate, and the swing arm driving member 22 moves to a position, so as to make the swing arm 3 swing by a corresponding angle, thereby adjusting the cooperation relationship between the swing arm 3 and the gear 12.

[0033] Specifically, in the embodiment, the hand-cranking structure for driving the traction wheel further comprises a positioning plate 4 arranged close to the lower connecting piece 232, the positioning plate 4 is provided with a plurality of positioning holes 401, and the plurality of positioning holes 401 are distributed in the horizontal direction one by one at intervals; the lower connecting piece 232 is provided with a positioning bead 5 for fitting into the corresponding positioning hole 401, and through the cooperation of the positioning bead 5 and the corresponding positioning hole 401, the brake locking piece 23 can be positioned in the appropriate position after rotation.

[0034] For example, the positioning plate 4 is provided with two positioning holes 401 distributed at intervals left and right, and the two positioning holes 401 correspond to the LOCK and UNLOCK marks on the front side of the mounting plate 20 respectively. Further, the lower connecting piece 232 is also provided with a through hole 2320, the through hole 2320 is provided with a clamping column 6 inserted therein, the side of the clamping column 6 facing the positioning plate 4 is provided with a groove (not shown in the figure), the groove (not shown in the figure) is provided with a spring (not shown in the figure), the positioning bead 5 is connected with the spring (not shown in the figure) and partially protrudes from the groove (not shown in the figure). The positioning bead 5 rotates synchronously with the rotation of the brake locking piece 23, so it can be rotated to the corresponding positioning hole 401 and engaged with it to rotate and position, thereby realizing the locking or unlocking operation and meeting different operation requirements.

[0035] Specifically, in the embodiment, the swing arm 3 comprises a swing arm body 31 and an extension arm 32, the swing arm body 31 is arranged to swing up and down, the extension arm 32 is arranged on the side of the swing arm body 31 close to the gear 12 and located obliquely above the gear 12, and the side of the extension arm 32 opposite to the gear 12 is provided with a rack 320 for engaging with the gear 12. The rack 320 is specifically engaged with the gear teeth of the gear 12, when the two are in the engaged state, the positioning of the gear 12 is realized; when the two are not in the engaged state, the gear 12 is not positioned.

[0036] Further, the swing arm body 31 comprises a support arm 311 and a connecting arm 312; the support arm 311 is in the shape of an inverted triangle, and the first end and the second end of the support arm 311 are both above the third end thereof. The connecting arm 312 is distributed transversely, the first end of the support arm 311 is integrally connected with the connecting arm 312, and the second end of the support arm 311 is integrally connected with the extension arm 32; the upper portion of the support arm 311 is provided with a first arc-shaped through slot 3110, and the side of the connecting arm 312 away from the support arm 311 is provided with a second arc-shaped through slot 3120; the first arc-shaped through slot 3110 extends along the left-right direction, the second arc-shaped through slot 3120 extends along the up-down direction, and a plurality of swing connecting pieces 81 are arranged in the first arc-shaped through slot 3110 and the second arc-shaped through slot 3120, so that the swing arm body 31 can be swingingly mounted on the rear side of the mounting frame through the plurality of swing connecting pieces 81; and the third end of the support arm 311 is also connected to a suitable position on the rear side of the mounting plate 20 through a corresponding mounting shaft 82, so as to realize the swing supporting function. It should be noted that the mounting mode of the first arc-shaped through slot 3110 and the second arc-shaped through slot 3120 with the swing connecting pieces 81 and the mounting mode of the third end of the support arm 311 with the mounting shaft 82 are both subject to the reasonable angle of the up-down swing of the swing arm body 31, and are not limited in detail here.

[0037] Specifically, in the present embodiment, the connecting arm 312 is further provided with a top plate 91 and a limiting guide column 92, and the top plate 91 is swingingly arranged up and down; the top plate 91 is provided with an arc-shaped limiting guide slot 910, which also extends along the up-down direction, and the limiting guide column 92 is arranged in the limiting guide slot 910, so as to limit the swing degree of the swing arm 3 when it swings, and enable the swing arm 3 to swing at a suitable angle more accurately. The upper portion of the top plate 91 is provided with a limiting block 93 on the side close to the connecting arm 312, the limiting block 93 is perpendicular to the top plate 91 and located above the connecting arm 312, so as to prevent excessive swing. The lower portion of the top plate 91 is provided with a first inclined surface, a second inclined surface, a flat surface and a third inclined surface which are arranged in a stepped manner from top to bottom, the first inclined surface is located on the side close to the gear 12, and the third inclined surface is located on the side away from the gear 12; the inclination of the first inclined surface, the second inclined surface and the third inclined surface are all different. When the swing arm driving piece rotates with the rotary handle 21, it abuts against the first inclined surface, the second inclined surface, the flat surface or the third inclined surface, so as to lift or lower the swing arm 3 to a suitable height under the action of the swing arm driving piece.

[0038] Specifically, in this embodiment, a connecting shaft 111 is provided in the middle of the rotating handwheel 11, and a self-lubricating sleeve 112 is fitted on the connecting shaft 111; the end of the connecting shaft 111 away from the rotating handwheel 11 is connected to the transmission connector 113. During the rotation of the connecting shaft 111, the self-lubricating sleeve 112 plays an adjusting and centering role on the connecting shaft 111, and releases graphite powder to reduce the friction between the connecting shaft 111 and the sleeve. The transmission connector 113 is, for example, a coupling. After the gear 12 is connected to the drive shaft of the traction wheel 10 through the coupling, the drive shaft transmits torque to the traction wheel 10.

[0039] Example 2: This embodiment of the invention also provides a magnetic resonance imaging (MRI) bed motion positioning system, which includes the hand-cranked traction wheel drive structure described in Example 1. For a detailed description of the hand-cranked traction wheel drive structure, please refer to Example 1; it will not be repeated here.

[0040] For example, such as Figure 6 and Figure 7 As shown, the magnetic resonance bed movement and positioning system includes a magnetic resonance magnet 100, a magnetic resonance bed 200, and an intracavitary support 300. The intracavitary support 300 is disposed within the cavity of the magnetic resonance magnet 100, and the magnetic resonance bed 200 is disposed within the intracavitary support 300.

[0041] Specifically, in the application of this hand-cranked traction wheel drive structure, for example, the traction wheel 10 is mounted on the cavity support 300, and the cavity support 300 should also be equipped with a driven wheel 30. The traction wheel 10 is connected to the driven wheel 30 via a synchronous belt 40, and the synchronous belt 40 should also be equipped with a sliding seat 50. The magnetic resonance bed 200 is mounted on the sliding seat 50. Then, the gear 12 in this hand-cranked traction wheel drive structure is connected to the drive shaft of the traction wheel 10 via a coupling. Thus, the handwheel can drive the gear 12 to rotate, and the gear 12 drives the traction wheel 10 to rotate. With the cooperation of the driven wheel 30 and the synchronous belt 40, the traction wheel 10 causes the sliding seat 50 to move the magnetic resonance bed 200 on the cavity support 300, ultimately realizing the movement and positioning operation of the magnetic resonance bed 200, so that the magnetic resonance bed 200 can be moved to any suitable position within the magnetic resonance magnet 100. The feed accuracy of the magnetic resonance bed 200 is set to ≤3mm, for example, which can be determined by the scale indicator 201 to provide more accurate position information.

[0042] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A hand-cranking structure for a traction wheel drive, characterized by: The hand-cranking structure for driving the traction wheel comprises a hand-cranking wheel assembly, a rotation locking assembly and a swing arm; the hand-cranking wheel assembly comprises a rotating hand wheel and a gear wheel arranged on the rotating hand wheel, the rotating hand wheel is used to drive the gear wheel to rotate circumferentially when the rotating hand wheel rotates, and the gear wheel is connected with the traction wheel through a transmission connecting piece; the rotation locking assembly comprises a rotating handle and a swing arm driving piece arranged on the rotating handle, the rotating handle is used to drive the swing arm driving piece to rotate circumferentially when the rotating handle rotates, and the swing arm driving piece is used to drive the swing arm to swing back and forth relative to the gear wheel when the swing arm driving piece rotates; the swing arm is engaged with the gear wheel when the swing arm swings to a first position, and the swing arm is disengaged from the gear wheel when the swing arm swings to a second position.

2. The hand-cranking structure for a traction wheel drive according to claim 1, characterized by: The rotation locking assembly further comprises a brake locking piece connected with the rotating handle; the swing arm driving piece comprises a shaft body and a shaft cap arranged on the shaft body, and one end of the shaft body away from the shaft cap is arranged on the brake locking piece; the shaft body is abutted with the lower end of the swing arm.

3. The hand-cranking structure for a traction wheel drive according to claim 2, characterized in that: The brake locking piece comprises an integrally connected upper connecting piece and a lower connecting piece, a clamping groove is arranged at the position where the upper connecting piece and the lower connecting piece are connected and formed, and the rotating handle is detachably connected through the clamping groove; the included angle between the upper connecting piece and the lower connecting piece is obtuse; the shaft body is vertically arranged on one side surface of the upper connecting piece.

4. The hand-cranking structure for a traction wheel drive according to claim 3, characterized in that: The hand-cranking structure for driving the traction wheel further comprises a positioning plate arranged close to the lower connecting piece, a plurality of positioning holes are arranged on the positioning plate, and the plurality of positioning holes are distributed in the horizontal direction one by one; the lower connecting piece is internally provided with a positioning bead adapted to be clamped into the corresponding positioning hole.

5. The hand-cranking structure for a traction wheel drive according to claim 4, characterized in that: A through hole is further arranged on the lower connecting piece, a clamping column is inserted into the through hole, a groove is arranged on one side surface of the clamping column facing the positioning plate, a spring is arranged in the groove, and the positioning bead is connected with the spring and partially protrudes from the groove.

6. The hand-cranking structure for a traction wheel drive according to claim 1, characterized by: The swing arm comprises a swing arm body and an extension arm, the swing arm body is arranged to swing up and down, the extension arm is arranged on one side of the swing arm body close to the gear wheel and located obliquely above the gear wheel, and one side surface of the extension arm opposite to the gear wheel is provided with a gear rack used to engage with the gear wheel.

7. The hand-cranking structure for a traction wheel drive according to claim 6, characterized by: The swing arm body comprises a supporting arm and a connecting arm; the supporting arm is in the shape of an inverted triangle, the first end and the second end of the supporting arm are both located above the third end; the first end of the supporting arm is integrally connected with the connecting arm, and the second end of the supporting arm is integrally connected with the extension arm; the upper part of the supporting arm is provided with a first arc-shaped through groove, one side of the connecting arm away from the supporting arm is provided with a second arc-shaped through groove, and a plurality of swing connecting pieces are arranged in the first arc-shaped through groove and the second arc-shaped through groove.

8. The hand-cranking structure for a traction wheel drive according to claim 7, characterized by: The connecting arm is further provided with a top plate and a limiting guide column, and the top plate is arranged to swing up and down; an arc-shaped limiting guide groove is arranged on the top plate, and the limiting guide column is arranged in the limiting guide groove; a limiting block is arranged on one side surface of the top plate close to the connecting arm, and the limiting block is located above the connecting arm; the lower part of the top plate is provided with a first inclined surface, a second inclined surface, a flat surface and a third inclined surface which are sequentially distributed in the shape of steps from top to bottom, and the swing arm driving piece is abutted on the first inclined surface, the second inclined surface, the flat surface or the third inclined surface when the swing arm driving piece rotates with the rotating handle.

9. The hand crank arrangement for a traction wheel drive according to any one of claims 1-8, characterized in that: The middle part of the rotating hand wheel is provided with a connecting shaft, and a self-lubricating sleeve is sleeved on the connecting shaft; and the end of the connecting shaft away from the rotating hand wheel is connected with a transmission connecting piece.

10. A magnetic resonance bed positioner system, characterized by: The magnetic resonance bed body moving positioning system comprises the hand-cranking structure for driving the traction wheel according to any one of claims 1-9.

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