Field shimming equipment

Abstract

The present application relates to the field of nuclear magnetic resonance technology, and discloses a shimming tool. The shimming tool comprises: a fixed disk group, including two fixed disks arranged opposite to each other; a central axis assembly, both ends of which are respectively connected to the fixed disks and can rotate relative to the fixed disks to detect the magnetic field strength in the circumferential direction of the central axis assembly; wherein the fixed disk comprises a disk body and a plurality of support assemblies, and the plurality of support assemblies are arranged at intervals along the circumference of the disk body, and any support assembly can extend out of the disk body in the radial direction of the disk body and lock the relative position with the disk body. This embodiment can change the effective diameter of the fixed disk through the support assembly, support the disk body in the inner barrel of the nuclear magnetic device, enable the fixed disk to adapt to inner barrels of different inner diameters, and improve the versatility of the shimming tool.

Description

Technical Field

[0001] The present application relates to the field of nuclear magnetic resonance technology, for example, to a field shimming tool. Background Art

[0002] In nuclear magnetic resonance imaging technology, in order to obtain higher image quality and diagnostic effect, high requirements are usually placed on the uniformity of the main magnetic field. Existing superconducting nuclear magnetic resonance systems are generally composed of superconducting magnets, gradient coils and orthogonal body coils concentrically nested. During the production and installation process, there are magnet manufacturing errors, magnet and gradient coil installation errors, gradient coil and orthogonal body coil installation errors, and cumulative errors of the three installations. In order to ensure the normal and stable operation of nuclear magnetic resonance equipment, the magnetic field needs to be uniformed during the installation and commissioning stage of nuclear magnetic resonance equipment to obtain higher image quality.

[0003] In the related art, the magnetic field is generally detected and shimmed by a shimming tool. For example, the shimming tool includes two fixing seats and a center rod. A shimming probe is arranged on the center rod. The center rod is arranged in the nuclear magnetic resonance device through the fixing seat.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] In the related art, when the shimming tray tool detects the magnetic field in the nuclear magnetic device, the fixing seat of the shimming tray tool needs to be fixed in the nuclear magnetic device so that the shimming probe on the center rod is matched with the axis of the nuclear magnetic device. However, the size of the fixing seat is fixed, and one shimming tool can only be adapted to a nuclear magnetic device with one cylinder diameter, and the versatility of the shimming tool is poor.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The disclosed embodiment provides a shimming tool, which can change the effective diameter of a fixed disk, adapt to nuclear magnetic resonance equipment with different cylinder diameters, and improve the versatility of the shimming tool.

[0009] According to an embodiment provided in the present application, a uniform field tool is provided, which includes: a fixed disk group, including two fixed disks arranged opposite to each other; a central axis assembly, both ends of which are respectively connected to the fixed disks and can rotate relative to the fixed disks to detect the magnetic field strength in the circumferential direction of the central axis assembly; wherein the fixed disk includes: a disk body; and a plurality of support assemblies arranged at intervals along the circumference of the disk body, and any support assembly can extend out of the disk body in the radial direction of the disk body and lock its relative position with the disk body.

[0010] In some optional embodiments, corresponding positions of the disk body and the support assembly are provided with a plurality of fixed gears spaced apart along the radial direction of the disk body, and the support assembly can be set at any of the plurality of fixed gears.

[0011] In some optional embodiments, a slide groove and a cover plate extending radially along the disk body are arranged at corresponding positions of the disk body and the support assembly, the slide groove is connected with the side wall and a surface of the disk body, the cover plate covers the notch connecting the slide groove and the surface of the disk body, and the multiple fixed gears include a plurality of through holes arranged on the cover plate and spaced apart along the radial direction of the disk body, the support assembly is arranged in the slide groove, and can cooperate with a through hole to limit the position.

[0012] In some optional embodiments, the support assembly includes: a support block, which is arranged in the slide groove, the first end of the support block can extend out of the slide groove, and the second end of the support block includes a first inclined surface; an inclined surface block, which is arranged in the slide groove and partially embedded in a through hole to limit the movement of the inclined surface block along the radial direction of the disk body, and the wall surface of the inclined surface block facing the support block includes a second inclined surface, and the second inclined surface is connected to the first inclined surface; an adjusting screw, which passes through the avoidance hole on the other surface of the disk body, cooperates with the inclined surface block, and can drive the second inclined surface of the inclined surface block to squeeze the first inclined surface, and there are multiple avoidance holes, which correspond one by one to the through holes.

[0013] In some optional embodiments, the support block is provided with a limiting protrusion embedded in another through hole.

[0014] In some optional embodiments, the two fixed plates include a first fixed plate, the first fixed plate includes a first plate body and a rotating member, a first connecting hole is provided at the axis center of the first plate body, the rotating member is passed through the first connecting hole and is rotatably connected to the first plate body, and the first end of the central axis assembly is connected to the rotating member.

[0015] In some optional embodiments, the rotating member includes: a rotating sleeve, one end of which is rotatably connected to the first disk body through a first connecting hole; and a rotating nut, which is rotatably connected to the other end of the rotating sleeve; wherein the first end of the central axis assembly is passed through the rotating sleeve and is threadedly connected to the rotating nut, and the central axis assembly and the rotating sleeve are matched in the circumferential limit position of the rotating sleeve.

[0016] In some optional embodiments, the first end of the central axis assembly is provided with a scale mark, and the rotating sleeve has an observation hole exposing the scale mark and an indicator mark arranged on the outer periphery of the observation hole, and the indicator mark cooperates with the scale mark to indicate the rotating nut to adjust the relative position of the central axis assembly and the first disk body in the axial direction of the central axis assembly.

[0017] In some optional embodiments, the two fixed plates also include a second fixed plate, the second fixed plate includes a second plate body, a second connecting hole is provided at the axis center of the second plate body, a wear-resistant part is provided on the inner side wall of the second connecting hole, and the second end of the central axis assembly is provided in the second connecting hole.

[0018] In some optional embodiments, the fixed disk also includes: a stopper, which can extend out of the disk body in the radial direction of the disk body and is used to fit with the end face of the inner barrel of the nuclear magnetic device to limit the relative position of the disk body and the inner barrel in the axial direction of the disk body. A positioning portion is provided on the stopper, and the positioning portion is used to cooperate with the positioning matching portion of the nuclear magnetic device to indicate the relative position of the disk body and the inner barrel in the circumferential direction of the disk body.

[0019] In some optional embodiments, the central axis assembly includes: a central axis, whose ends are respectively connected to corresponding fixed plates and are provided with a placement groove extending along the axial direction of the central axis, and the placement groove has multiple fixed positions in the axial direction of the central axis; a detector, in the axial direction of the central axis, the length of the detector is smaller than the length of the placement groove, the detector is partially embedded in the placement groove, and is connected to at least one fixed position.

[0020] The shimming tool provided in the embodiments of the present disclosure can achieve the following technical effects:

[0021] With this optional embodiment, the two ends of the central axis assembly are respectively connected to the fixed disk, that is, the two ends of the central axis assembly are respectively provided with a fixed disk, and the fixed disk can be connected to the nuclear magnetic device to fix the shimming tool. The central axis assembly can rotate relative to the fixed disk to detect the magnetic field strength in the entire circumferential direction at the center position of the nuclear magnetic device, so as to determine the shimming elements at each angle, so as to facilitate shimming and improve the detection effect and shimming effect of the nuclear magnetic device. A plurality of support assemblies are arranged at intervals along the circumference of the disk body, and each support assembly can extend out of the disk body in the radial direction of the disk body and lock the relative position with the disk body. In this way, the effective diameter of the fixed disk can be increased by adjusting the radial length of the support assembly extending out of the disk body, and the disk body can be supported in the inner barrel of the nuclear magnetic device, so that the fixed disk can be adapted to inner barrels of different inner diameters, thereby improving the versatility of the shimming tool.

[0022] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily described by corresponding drawings, and these exemplary descriptions and drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are considered similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0024] Figure 1 It is a structural schematic diagram of a field shimming tool provided by an embodiment of the present disclosure from one viewing angle;

[0025] Figure 2 is a structural schematic diagram of a shimming tool provided by an embodiment of the present disclosure from another perspective;

[0026] Figure 3 is a schematic diagram of the structure of a fixed disk provided in an embodiment of the present disclosure;

[0027] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0028] Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure along the BB direction;

[0029] Figure 6 is a partial structural schematic diagram of a fixed disk provided in an embodiment of the present disclosure;

[0030] Figure 7 is a schematic structural diagram of another fixed disk provided in an embodiment of the present disclosure;

[0031] Figure 8 It is a schematic structural diagram of a central axis assembly provided in an embodiment of the present disclosure.

[0032] Reference numerals:

[0033] 100, fixed disk assembly; 110, fixed disk; 111, disk body; 112, slide groove; 113, through hole; 114, cover plate; 120, support assembly; 121, support block; 122, limit protrusion; 123, adjustment screw; 124, inclined block; 130, stopper; 131, positioning part; 132, movable through groove; 140, limiter; 141, connecting part; 142, pressing part; 150, first fixed disk; 151, first disk body; 152, first connecting hole; 153, rotating nut; 154, positioning Groove; 155, rotating sleeve; 1551, observation hole; 156, connecting rod; 157, positioning rod; 160, second fixed disk; 161, second disk body; 162, second connecting hole; 163, wear-resistant part; 200, middle axis assembly; 210, center axis; 211, placement groove; 212, fixing position (first fixing position); 213, second threaded portion; 214, pin shaft portion; 215, first plane side wall; 220, mounting plate; 221, mounting hole; 222, second fixing position; 300, detector. DETAILED DESCRIPTION

[0034] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0035] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0037] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0038] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0040] The present disclosure provides a field shimming tool, such as Figures 1 to 8 As shown, the shimming tool includes a fixed disk group 100 and a central axis assembly 200, the fixed disk group 100 includes two fixed disks 110 arranged opposite to each other, the two ends of the central axis assembly 200 are respectively connected to the fixed disks 110, and the two ends of the central axis assembly 200 can rotate relative to the fixed disks 110 to detect the magnetic field strength in the circumferential direction of the central axis assembly 200. Among them, the fixed disk 110 includes a disk body 111 and a plurality of support assemblies 120, and the plurality of support assemblies 120 are arranged at intervals along the circumference of the disk body 111. Any support assembly 120 can extend out of the disk body 111 in the radial direction of the disk body 111 and lock the relative position with the disk body 111.

[0041] The shimming tool provided in the embodiment of the present disclosure can be connected to the inner barrel of the nuclear magnetic device to detect the magnetic field strength in the nuclear magnetic device. The two ends of the central axis assembly 200 are respectively connected to the fixed disk 110, that is, the two ends of the central axis assembly 200 are respectively provided with a fixed disk 110, and the fixed disk 110 can be connected to the nuclear magnetic device to fix the shimming tool. The central axis assembly 200 can rotate relative to the fixed disk 110 to detect the magnetic field strength in the entire circumferential direction at the center position of the nuclear magnetic device, so as to determine the shimming elements at each angle, so as to facilitate shimming and improve the detection effect and shimming effect of the nuclear magnetic device.

[0042] A plurality of support assemblies 120 are arranged at intervals along the circumference of the disk body 111, and each support assembly 120 can extend from the disk body 111 in the radial direction of the disk body 111 and lock the relative position with the disk body 111. In this way, the effective diameter of the fixed disk 110 can be increased by adjusting the radial length of the support assembly 120 extending from the disk body 111, and the disk body 111 can be supported in the inner barrel of the nuclear magnetic device, so that the fixed disk 110 can be adapted to the inner barrels of different inner diameters, thereby improving the versatility of the shimming tooling.

[0043] In some optional embodiments, corresponding positions of the disk body 111 and the support assembly 120 are provided with a plurality of fixed gears spaced apart along the radial direction of the disk body 111 , and the support assembly 120 can be set at any of the plurality of fixed gears.

[0044] In this embodiment, along the radial direction of the disc body 111, the disc body 111 and the corresponding positions of the support assembly 120 are spaced apart and distributed with a plurality of fixed gears. When the support assembly 120 is set at different fixed gears, the length of the support assembly 120 extending radially out of the disc body 111 is different. By setting the support assembly 120 at different fixed gears, the limit of the extension length of the support assembly 120 itself can be changed, so that the fixed disc can be adapted to the inner barrel with a larger inner diameter, thereby improving the versatility of the shimming tooling.

[0045] For example, Figures 3 to 7 As shown, a slide groove 112 and a cover plate 114 extending radially along the disk body 111 are arranged at corresponding positions of the disk body 111 and the support assembly 120. The slide groove 112 is connected to the side wall and a surface of the disk body 111. The cover plate 114 covers the notch connecting the slide groove 112 and the surface of the disk body 111. The multiple fixed gears include multiple through holes 113 arranged on the cover plate 114 and spaced apart along the radial direction of the disk body 111. The support assembly 120 is arranged in the slide groove and can be limitedly matched with a through hole 113.

[0046] In this embodiment, the corresponding positions of the disc body 111 and the support assembly 120 are provided with a slide groove 112 and a cover plate 114 extending radially along the disc body 111, that is, the number of the slide groove 112 and the cover plate 114 are both multiple, and the slide groove 112, the cover plate 114 and the support assembly 120 correspond to each other. Multiple corresponding slide grooves 112, cover plates 114 and support assemblies 120 are arranged at intervals along the circumference of the disc body 111, so that the relative position of the disc body 111 and the inner barrel can be adjusted by adjusting the support assemblies 120 at different positions, so that the disc body 111 and the inner barrel can be arranged coaxially, the operation is simple, and the accuracy of the detection of the shimming tooling is improved.

[0047] The slide groove 112 is connected to the side wall and a surface of the disk body 111. The multiple fixed gears include multiple through holes 113 set on the cover plate 114. The support component 120 is set in the slide groove 112 and can be limited with a through hole 113. The support component 120 can extend out of the side wall of the disk body 111. When the support component 120 is limited with different through holes 113, the support component 120 is set at different fixed gears.

[0048] Exemplarily, a plurality of slide grooves 112 are evenly arranged on the circumferential side wall of the disk body 111. In this way, when a plurality of support assemblies 120 are arranged at the same fixed gear, the fixed disk can be arranged coaxially with the inner barrel of the nuclear magnetic device. This facilitates the adjustment of the length of the slide groove 112 extending from the support assembly 120, and the operation is simple.

[0049] Optionally, the number of the chutes 112 ranges from 2 to 10. For example, the number of the chutes 112 may be 2, 3, 4, 5, 6, 7, 8, 9 or 10.

[0050] For example, the number of the slide grooves 112 is three, and the angle between two adjacent slide grooves 112 is 120 degrees. Alternatively, the number of the slide grooves 112 is four, and the angle between two adjacent slide grooves 112 is 90 degrees. Alternatively, the number of the slide grooves 112 is five, and the angle between two adjacent slide grooves 112 is 72 degrees.

[0051] In this embodiment, the specific number of the slide groove 112, the cover plate 114 and the support assembly 120 can be determined according to actual needs and is not specifically limited here.

[0052] Furthermore, if Figure 4 , Figure 6 and Figure 7 As shown, the support assembly 120 includes a support block 121, an adjusting screw 123 and a ramp block 124. The support block 121 is disposed in the slide slot 112. The first end of the support block 121 can extend out of the slide slot 112. The second end of the support block 121 includes a first ramp.

[0053] The inclined surface block 124 is arranged in the slide groove 112, and the inclined surface block 124 is partially embedded in a through hole 113 to limit the movement of the inclined surface block 124 along the radial direction of the disk body 111. The wall surface of the inclined surface block 124 facing the support block 121 includes a second inclined surface, and the second inclined surface is connected to the first inclined surface. The adjusting screw 123 passes through the avoidance hole on the other surface of the disk body 111 to cooperate with the inclined surface block 124, and the adjusting screw 123 can drive the second inclined surface of the inclined surface block 124 to squeeze the first inclined surface. There are multiple avoidance holes, and the avoidance holes correspond to the through holes 113 one by one.

[0054] Optionally, the adjusting screw 123 includes a screwing portion and a first threaded portion connected to each other. Along the axial direction of the disk body 111, the first threaded portion passes through the avoidance hole on the other surface of the disk body 111 and is threadedly connected to the inclined surface block 124. The inclined surface block 124 can move relative to the slide groove 112 along the axial direction of the disk body 111, so that the second inclined surface presses the first inclined surface, or releases the first inclined surface. The screwing portion is provided on the other surface of the disk body 111, that is, the surface of the disk body 111 away from the support assembly 120. This allows the user to rotate the adjusting screw 123 through the screwing portion, and the operation is simple.

[0055] Optionally, the outer wall of the first threaded portion is provided with an external thread, the inclined surface block is provided with a first internal thread groove, and the first external threaded portion is threadedly connected to the internal thread groove. Alternatively, the first threaded portion is provided with a second internal thread groove, the inclined surface block is provided with an external thread protrusion, and the external thread protrusion is threadedly connected to the internal thread groove.

[0056] In this embodiment, the side wall of the inclined surface block 124 facing the support block 121 includes a second inclined surface, and the second end of the support block 121 includes a first inclined surface, and the first inclined surface is connected to the second inclined surface. The adjusting screw 123 passes through the other surface of the disk body 111 and is connected to the inclined surface block 124. By adjusting the adjusting screw 123, the inclined surface block 124 can be driven to move along the axial direction of the disk body 111. In this way, when the adjusting screw 123 causes the inclined surface block 124 to move along the axial direction of the disk body 111, the second inclined surface squeezes the first inclined surface, and the inclined surface block 124 can drive the first inclined surface through the second inclined surface, that is, drive the support block 121 to move radially along the disk body 111 in the slide groove 112, so as to fine-tune the length of the support block 121 extending out of the slide groove 112 again, so that the fixed disk 110 is connected to the inner barrel, and the fixed disk 110 and the inner barrel are arranged coaxially. The length of the support block 121 extending out of the slide slot 112 is adjusted by adjusting the screw rod 123 , thereby reducing the difficulty of installing the shimming tool and simplifying the operation.

[0057] In this embodiment, there are multiple avoidance holes, and the avoidance holes correspond one to one with the through holes 113. In this way, when the support assembly 120 is set at different fixed positions, that is, when the inclined plane blocks 124 are set at different through holes 113, the adjusting screw can be connected to the inclined plane blocks 124 through the avoidance holes corresponding to the through holes 113, thereby improving the stability and reliability of the support assembly 120.

[0058] For example, Figure 4 As shown, the second inclined surface and the first inclined surface are arranged in sequence along the direction of the inclined surface block 124 toward the adjusting screw 123. In this way, when the adjusting screw 123 is rotated to make the inclined surface block 124 move toward the screwing part of the adjusting screw 123, the second inclined surface squeezes the first inclined surface, and the second inclined surface drives the support block 121 to move in the direction of extending out of the slide slot 112. When the adjusting screw 123 is rotated to make the inclined surface block 124 move away from the screwing part of the adjusting screw 123, the second inclined surface releases the force applied to the first inclined surface, and the support block 121 can move in the direction of retracting into the slide slot 112.

[0059] Optionally, the first inclined surface and the second inclined surface are sequentially arranged along the direction of the inclined surface block 124 toward the adjusting screw 123. In this way, when the adjusting screw 123 is rotated to make the inclined surface block 124 move toward the direction of the screwing portion of the adjusting screw 123, the second inclined surface releases the force applied to the first inclined surface, and the support block 121 can move in the direction of retracting into the slide groove 112. When the adjusting screw 123 is rotated to make the inclined surface block 124 move away from the screwing portion of the adjusting screw 123, the second inclined surface squeezes the first inclined surface, and the second inclined surface drives the support block 121 to move in the direction of extending out of the slide groove 112.

[0060] For example, Figure 1 , Figure 2 and Figure 6 As shown, the support block 121 is provided with a limiting protrusion 122 , and the limiting protrusion 122 is embedded in another through hole 113 .

[0061] In this embodiment, the support block 121 is provided with a limiting protrusion 122, and the limiting protrusion 122 and the inclined surface block are arranged at intervals along the radial direction of the disk body 111. The inclined surface block 124 is partially embedded in a through hole, and the limiting protrusion 122 is embedded in another through hole 113. The inclined surface block 124 and the limiting protrusion 122 are respectively arranged in different through holes, which can improve the utilization rate of the through holes. In the process of the support block 121 extending out of the chute 112, the support block 121 drives the limiting protrusion 122 to move relative to the other through hole 113. After the limiting protrusion 122 abuts against the limiting side wall of the other through hole 113, the limiting side wall of the other through hole 113 limits the limiting protrusion 122 from continuing to move, that is, the support block 121 is limited to continue to slide, reducing the occurrence of the support block 121 sliding out of the chute 112, which is convenient for taking and storing the uniform field tooling and easy to operate.

[0062] Optionally, along the radial direction of the disk body 111 , an extension length of the limiting protrusion 122 is smaller than an extension length of the through hole 113 .

[0063] In some optional embodiments, such as Figure 3 , Figure 5 and Figure 7As shown, the fixed disk 110 also includes a stopper 130, which can extend out of the disk body 111 in the radial direction of the disk body 111. The stopper 130 is used to fit with the end surface of the inner barrel of the nuclear magnetic device to limit the relative position of the disk body 111 and the inner barrel in the axial direction of the disk body 111.

[0064] The stopper 130 is provided with a positioning portion 131 , which is used to cooperate with a positioning matching portion of the nuclear magnetic device to indicate the relative position of the disk body 111 and the inner barrel in the circumferential direction of the disk body 111 .

[0065] With this optional embodiment, the baffle extends out of the disk body 111 in the radial direction of the disk body 111 to limit the relative position of the disk body 111 and the inner barrel in the axial direction of the disk body 111, and fix the disk body 111. The stopper 130 is provided with a positioning portion 131, and the nuclear magnetic device is provided with a positioning matching portion. The positioning portion 131 cooperates with the positioning matching portion to indicate the relative position of the disk body 111 and the inner barrel in the circumferential direction of the disk body 111, and position the disk body 111. The stopper 130 and the positioning portion 131 provided on the stopper 130 can fix the relative position of the disk 110 and the inner barrel, avoid the position of the fixed disk 110 from moving during the shimming process, and ensure the consistency of the position of the central axis assembly 200 measuring the field strength at the same angle before and after the shimming sheet is configured. In addition, the disk body 111 can also be placed in a position coaxially arranged with the inner barrel to improve the accuracy of the shimming.

[0066] Along the axial direction of the disk body 111 , the stopper 130 may be disposed on the side wall of the disk body 111 away from the mounting member, so that the user can observe the matching condition between the positioning portion 131 and the positioning matching portion and the operation is convenient.

[0067] Optionally, there are multiple stoppers 130 , which are spaced apart circumferentially along the disk body 111 , and the number of positioning fitting parts is the same as and corresponds one to one with the number of stoppers 130 ; or, there are multiple positioning fitting parts, and the number of positioning fitting parts is less than the number of stoppers 130 .

[0068] The number of blocks 130 (i.e., matching parts) is greater than or equal to the number of positioning matching parts, so that the disk body 111 and the inner barrel have multiple connection positions, all of which can indicate the relative positions of the disk body 111 and the inner barrel in the circumferential direction of the disk body 111, so as to increase the connection methods of the uniform field tooling.

[0069] Exemplarily, the positioning matching portion includes a first scale line, an extension line of the first scale line passes through the axis of the inner barrel, and the positioning portion 131 includes a second scale line, an extension line of the second scale line passes through the axis of the disk body 111.

[0070] In this embodiment, when the inner diameter of the inner barrel is larger than the diameter of the disc body 111, the fixed disc 110 is connected to the inner barrel by extending the support block 121 so that the support block 121 is connected to the inner side wall of the inner barrel. At this time, it can be determined whether the disc body 111 is coaxially arranged with the inner barrel by observing whether the positioning portion 131 is matched with the positioning matching portion. If the disc body 111 is not coaxially arranged with the inner barrel, the fixed gear position of the support assembly 120 can be changed to make the disc body 111 coaxially arranged with the inner barrel. When the axis of the disc body 111 and the axis of the inner barrel differ slightly, the length of different support blocks 121 extending out of the slide slot 112 can be adjusted by rotating multiple adjustment screws 123 to fine-tune the relative position of the disc body 111 and the inner barrel, so that the disc body 111 is coaxially arranged with the inner barrel, thereby improving the detection effect and the shimming effect of the shimming tooling, and the operation is simple, reducing the difficulty of adjusting the position of the disc body 111.

[0071] Furthermore, the stopper 130 is provided with a movable through slot 132, and the fixed disk 110 further includes a stopper 140, which includes a connecting portion 141 and a pressing portion 142 connected to each other, the connecting portion 141 passes through the movable through slot 132 and is connected to the disk body 111, and the pressing portion 142 is pressed on the side wall of the stopper 130 away from the disk body 111. Along the radial direction of the disk body 111, the extension length of the movable through slot 132 is greater than the diameter of the connecting portion 141, and the connecting portion 141 can move relative to the movable through slot 132 to change the extension length of the part of the stopper 130 protruding from the disk body 111.

[0072] With this optional embodiment, the connection portion 141 passes through the movable through slot 132 and is connected to the disk body 111, and the pressing portion 142 is pressed on the side wall of the stopper 130 away from the disk body 111, so that the stopper 130 is relatively fixedly connected to the disk body 111 through the stopper 140. Along the radial direction of the disk body 111, the extension length of the movable through slot 132 is greater than the diameter of the connection portion 141, that is, in the process of fixing the stopper 130, the movable through slot 132 can move relative to the connection portion 141 along the radial direction of the disk body 111 to change the relative position between the movable through slot 132 and the stopper 140, thereby changing the extension length of part of the stopper 130 protruding from the disk body 111, so that the extension length of the stopper 130 protruding from the disk body 111 can adapt to the inner barrel of nuclear magnetic equipment with different inner diameters.

[0073] Optionally, the positioning portion 131 is located at the end of the stopper 130 protruding from the disk body 111 .

[0074] Optionally, the disc body 111 is also provided with a weight-reducing groove.

[0075] Optionally, the disc body 111 includes an outer disc body, an inner disc body and a connecting plate body, the inner disc body and the outer disc body are connected via the connecting plate body, the outer disc body extends in a ring shape, and the extension angle of the outer disc body is greater than or equal to 180 degrees.

[0076] Optionally, the extension angle of the peripheral disc is 180 degrees, 200 degrees, 220 degrees, 240 degrees, 260 degrees, 280 degrees, 300 degrees, 320 degrees, 340 degrees or 360 degrees. When the extension angle of the peripheral disc is 360 degrees, the peripheral disc is arranged in an annular shape.

[0077] In some optional embodiments, such as Figures 1 to 3 and Figure 6 As shown, the two fixed plates 110 include a first fixed plate 150, and the first fixed plate 150 includes a first plate body 151 and a rotating member, and a first connecting hole 152 is provided at the axis of the first plate body 151. The rotating member is passed through the first connecting hole and is rotatably connected to the first plate body 111, and the first end of the central shaft assembly 200 is connected to the rotating member.

[0078] In this embodiment, the two fixed disks 110 include a first fixed disk 150, and both fixed disks 110 include a disk body 111 and a support assembly 120, and each fixed disk 110 may further include a stopper 130 and / or a stopper 140. In other words, the first fixed disk 150 includes a first disk body 151 and a first support assembly 120, and the first fixed disk 150 may further include a first stopper and / or a first stopper.

[0079] The first fixed disk 150 further includes a rotating member, the first end of the central axis assembly 200 is connected to the rotating member, and the rotating member is rotatably connected to the first disk body 111. In this way, the rotating member can drive the central axis assembly 200 to rotate relative to the first fixed disk along the circumference of the central axis assembly 200, so that the central axis assembly 200 can detect the magnetic field strength in the circumferential direction of the central axis assembly 200.

[0080] Furthermore, the rotating member includes a rotating sleeve 155 and a rotating nut 153, one end of the rotating sleeve 155 is rotatably connected to the first disk body 111 through the first connecting hole 152. The rotating nut 153 is rotatably connected to the other end of the rotating sleeve 155. The first end of the central axis assembly 200 is inserted into the rotating sleeve 155 and is threadedly connected to the rotating nut 153, and the central axis assembly 200 and the rotating sleeve 155 are matched in the circumferential limit of the rotating sleeve 155.

[0081] In this embodiment, the rotating sleeve 155 is sleeved on the first end of the central axis assembly 200, and one end of the rotating sleeve 155 is rotatably connected to the first connecting hole 152, the central axis assembly 200 is rotatably connected to the first connecting hole 152, and along the circumference of the central axis assembly 200, the central axis assembly 200 and the rotating sleeve 155 are limitedly matched, that is, the rotating sleeve 155 and the central axis assembly 200 are relatively fixed.

[0082] The other end of the rotating sleeve 155 is connected to the rotating nut 153, and the rotating nut 153 can drive the middle shaft assembly 200 to move along the axial direction of the middle shaft assembly 200 relative to the rotating sleeve 155. The middle shaft assembly 200 can move along the axial direction of the middle shaft assembly 200 relative to the rotating sleeve 155.

[0083] Furthermore, there is a set resistance between the other end of the rotating sleeve 155 and the rotating nut 153. When the middle shaft assembly 200 needs to move relative to the first disk body 151 along the axial direction of the middle shaft assembly 200, the user can apply a force to overcome the set resistance, so that the rotating nut 153 rotates relative to the rotating sleeve 155, so as to drive the middle shaft assembly 200 to move relative to the rotating sleeve 155 along the axial direction. When the middle shaft assembly 200 needs to rotate relative to the first disk body 151 along the circumferential direction of the middle shaft assembly 200, the user can drive the rotating nut 153, the rotating sleeve 155 and the middle shaft assembly 200 to rotate synchronously relative to the first disk body 111.

[0084] Alternatively, if Figure 2 and Figure 8 As shown, the first end of the middle shaft assembly 200 includes a second threaded portion 213 and a pin shaft portion 214 . The second threaded portion 213 is connected to the rotating nut 153 , and the rotating sleeve 155 is sleeved on the pin shaft portion 214 .

[0085] Optionally, the rotating nut 153 is provided with an internal thread, the outer side wall of the second threaded portion is provided with an external thread, and the rotating nut is threadedly connected to the second threaded portion.

[0086] Alternatively, an outer wall of the rotating nut 153 is provided with an external thread, the second threaded portion is provided with a third internal thread groove, and the rotating nut 153 is threadedly connected to the second threaded portion.

[0087] The rotating nut 153 is threadedly connected to the first end of the central axis assembly 200, and the first disk body 151 is rotationally connected to the rotating nut 153. In this way, the central axis assembly 200 can be driven to move relative to the first disk body 151 along the axial direction of the central axis assembly 200 by rotating the rotating nut 153, so that the detector 300 moves along the axial direction of the central axis assembly 200, the position of the detector 300 is adjusted, and the detection and shimming effects of the shimming tooling are improved.

[0088] Exemplarily, the outer wall of the pin shaft portion 214 includes a first circumferential side wall and a first planar side wall 215 connected to each other, and the inner wall of the rotating sleeve 155 includes a second circumferential side wall and a second planar side wall connected to each other, the first circumferential side wall is connected to the second circumferential side wall, and the first planar side wall 215 is connected to the second planar side wall, so as to limit the relative rotation of the middle axis assembly 200 and the connecting sleeve along the circumferential direction of the middle axis assembly 200.

[0089] Furthermore, if Figure 2 and Figure 5 As shown, the first end of the central axis assembly 200 is provided with a scale mark, the rotating sleeve 155 is provided with an observation hole 1551 exposing the scale mark and an indicator mark arranged on the outer periphery of the observation hole, and the indicator mark cooperates with the scale mark to indicate the rotating nut to adjust the relative position of the central axis assembly 200 and the first disk body 111 in the axial direction of the central axis assembly 200.

[0090] By adopting this optional embodiment, the relative position of the central axis assembly 200 and the first disk body 111 in the axial direction of the central axis assembly 200 can be determined by observing the coordination of the scale mark and the indicator mark through the observation hole 1551, thereby instructing the rotating nut 153 to adjust the relative position, thereby improving the accuracy of the central axis assembly 200 in detecting the magnetic field strength of the nuclear magnetic resonance equipment and facilitating operation.

[0091] Alternatively, if Figures 1 to 5 As shown, the rotating member further includes a connecting rod 156 and a positioning rod 157. The two ends of the connecting rod 156 are respectively connected to the rotating sleeve 155 and the positioning rod 157. The positioning rod 157 can move relative to the connecting rod 156 along the axial direction of the first disk body 151. The first disk body 151 is also provided with a plurality of positioning grooves 154. The plurality of positioning grooves 154 are arranged at intervals along the circumference of the first disk body 151. The positioning rod 157 can be selectively arranged in one of the positioning grooves 154.

[0092] In this embodiment, the positioning rod 157 and the connecting rod 156 can rotate synchronously with the rotating sleeve 155. The user can drive the positioning rod 157 to rotate, drive the central axis assembly 200 to rotate, and drive the detector 300 to rotate, so that the detector 300 can detect the entire circumferential magnetic field strength at the center position, determine the shimming elements of each angle for shimming, and improve the detection effect and shimming effect of the nuclear magnetic device. The positioning rod 157 can be selected and set in a positioning groove 154, and multiple positioning grooves 154 are arranged at intervals along the circumference of the first disk body 151. When the positioning rod 157 is set in the positioning groove 154, the positioning rod 157 is relatively fixed to the first disk body 151, the central axis assembly 200 is relatively fixed to the first disk body 151, and the detector 300 can be fixed relative to the first disk body 151 at a set angle to detect the magnetic field strength at the set angle.

[0093] Optionally, a plurality of positioning grooves 154 are evenly arranged along the circumference of the first disk body 151 .

[0094] Optionally, the number of the positioning slots 154 ranges from 2 to 72. For example, the number of the positioning slots 154 is 4, 8, 12, 16, 20, 24, 28, 32, 36 or 40.

[0095] In this embodiment, the specific number of the positioning grooves 154 can be determined according to the actual needs of detection and is not specifically limited here.

[0096] In some optional embodiments, such as Figure 1 , Figure 2 and Figure 7 As shown, the two fixed plates 110 also include a second fixed plate 160, which includes a second plate body 161. A second connecting hole 162 is provided at the axis of the second plate body 161, and a wear-resistant part 163 is provided on the inner side wall of the second connecting hole 162. The second end of the central axis 210 is provided in the second connecting hole 162.

[0097] In this embodiment, the two fixed disks 110 include a second fixed disk 160, and each fixed disk 110 includes a disk body 111 and a support assembly 120, and each fixed disk 110 may also include a stopper 130 and / or a stopper 140. In other words, the second fixed disk 160 includes a second disk body 161 and a second support assembly. The second fixed disk 160 may also include a second stopper and / or a second stopper.

[0098] The inner wall of the second connecting hole 162 is provided with a wear-resistant part 163, and the second end of the central axis assembly 200 is rotatably connected to the wear-resistant part 163 to reduce the friction between the second end of the central axis assembly 200 and the second connecting hole 162, thereby improving the service life of the central axis assembly 200 and the second fixed plate 160.

[0099] Optionally, the wear-resistant part 163 is made of Teflon plastic.

[0100] Optionally, the diameter of the second connection hole 162 gradually increases along the axis of the second fixing plate 160 toward the circumferential side wall of the second fixing plate 160 , so as to facilitate the disassembly and assembly of the middle shaft assembly 200 .

[0101] In some optional embodiments, such as Figure 1 , Figure 2 and Figure 8 As shown, the central axis assembly 200 includes a central axis 210 and a detector 300. The ends of the central axis 210 are respectively connected to the corresponding fixing plates 110, and the central axis 210 is provided with a placement groove 211 extending along the axial direction of the central axis 210. The placement groove 211 has a plurality of fixing sites 212 (hereinafter referred to as first fixing sites 212 for the sake of distinction) in the axial direction of the central axis 210. In the axial direction of the central axis 210, the length of the detector 300 is less than the length of the placement groove 211. The detector 300 is partially embedded in the placement groove 211 and connected to at least one first fixing site 212.

[0102] In this embodiment, the detector 300 is arranged in the placement groove 211, and the extension length of the placement groove 211 along the axial direction of the central axis 210 is greater than the length of the detector 300. The detector 300 is partially embedded in the placement groove 211 and connected to at least one fixing site. In this way, the relative position of the detector 300 and the central axis 210 along the axial direction of the central axis 210 is changed by placing the groove 211 and changing the fixing site connected to the detector 300, thereby changing the relative position of the detector 300 and the shimming tool, so that the shimming tool can adapt to different detectors 300 and nuclear magnetic equipment, and improve the versatility of the shimming tool.

[0103] Optionally, the central axis assembly 200 also includes a mounting plate 220, which is provided with a mounting hole 221 and a plurality of second fixing sites 222, wherein the mounting hole 221 is used to connect to the detector 300, and the plurality of second fixing sites 222 are arranged at axial intervals along the central axis 210, and any second fixing site 222 can be connected to any first fixing site 212 by fasteners.

[0104] In this embodiment, the mounting plate 220 is provided with a plurality of second fixing sites 222, and the central axis 210 is provided with a plurality of first fixing sites 212. The second fixing sites 222 and the first fixing sites 212 can be connected by fasteners, so that the mounting plate 220 is connected to the central axis 210. The mounting plate 220 is also provided with a mounting hole 221, and the detector 300 is connected to the mounting plate 220 through the mounting hole 221, that is, the detector 300 is connected to at least one first fixing site 212 through the mounting plate 220.

[0105] Optionally, the first fixing point 212 includes a plurality of first connection holes, and the plurality of first connection holes are arranged at intervals along a direction parallel to the radial direction of the central axis 210 .

[0106] Optionally, the second fixing point 222 includes a plurality of second connection holes, and the plurality of second connection holes are spaced apart on the mounting plate 220 along a direction parallel to the radial direction of the central axis 210 .

[0107] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A shimming tool, characterized in that: include: A fixed disk assembly, comprising two fixed disks arranged opposite to each other; The middle axis component has two ends connected to the fixed disk respectively and can rotate relative to the fixed disk to detect the magnetic field strength in the circumferential direction of the middle axis component; wherein the fixed disk includes: Plate body; A plurality of support components are arranged at intervals along the circumference of the disk body, and any support component can extend out of the disk body along the radial direction of the disk body and lock its relative position with the disk body.

2. The shimming tool according to claim 1, characterized in that: A plurality of fixed gears are arranged at corresponding positions of the disc body and the support assembly and are spaced apart along the radial direction of the disc body. The support assembly can be arranged at any one of the plurality of fixed gears.

3. The shimming tool according to claim 2, characterized in that: A slide groove and a cover plate extending radially along the disk body are arranged at corresponding positions of the disk body and the support assembly. The slide groove is connected with the side wall and a surface of the disk body. The cover plate covers the notch connecting the slide groove and the surface of the disk body. The multiple fixed gears include multiple through holes arranged on the cover plate and distributed at intervals along the radial direction of the disk body. The support assembly is arranged in the slide groove and can cooperate with a through hole to limit the position.

4. The shimming tool according to claim 3, characterized in that: The support components include: A support block is disposed in the slide slot, wherein a first end of the support block can extend out of the slide slot, and a second end of the support block includes a first inclined surface; The inclined surface block is arranged in the slide groove and partially embedded in a through hole to limit the movement of the inclined surface block along the radial direction of the disk body. The wall surface of the inclined surface block facing the support block includes a second inclined surface, and the second inclined surface is connected to the first inclined surface. The adjusting screw rod passes through the avoidance hole on the other surface of the disc body and cooperates with the inclined surface block, and can drive the second inclined surface of the inclined surface block to press the first inclined surface. There are multiple avoidance holes, which correspond to the through holes one by one.

5. The shimming tool according to claim 4, characterized in that: The supporting block is provided with a limiting protrusion which is embedded in another through hole.

6. The shimming tool according to any one of claims 1 to 5, characterized in that: The two fixed plates include a first fixed plate, which includes a first plate body and a rotating member. A first connecting hole is provided at the axis of the first plate body. The rotating member passes through the first connecting hole and is rotatably connected to the first plate body. The first end of the central axis assembly is connected to the rotating member.

7. The shimming tool according to claim 6, characterized in that: The rotating parts include: A rotating sleeve, one end of which is rotatably connected to the first disk body through a first connecting hole; The rotating nut is rotatably connected with the other end of the rotating sleeve; The first end of the central axis component is inserted into the rotating sleeve and is threadedly connected with the rotating nut. The central axis component and the rotating sleeve are matched in the circumferential limit position of the rotating sleeve.

8. The shimming tool according to claim 7, characterized in that: The first end of the central axis assembly is provided with a scale mark, and the rotating sleeve is provided with an observation hole exposing the scale mark and an indicator mark arranged on the outer periphery of the observation hole. The indicator mark cooperates with the scale mark to indicate the rotating nut to adjust the relative position of the central axis assembly and the first disk body in the axial direction of the central axis assembly.

9. The shimming tool according to any one of claims 1 to 5, characterized in that: The two fixed plates also include a second fixed plate, which includes a second plate body. A second connecting hole is provided at the axis of the second plate body, a wear-resistant part is provided on the inner wall of the second connecting hole, and the second end of the central axis assembly is provided in the second connecting hole.

10. The shimming tool according to any one of claims 1 to 5, characterized in that: The fixed disk also includes: The stopper can extend out of the disk body in the radial direction of the disk body and is used to fit with the end surface of the inner barrel of the nuclear magnetic device to limit the relative position of the disk body and the inner barrel in the axial direction of the disk body; a positioning portion is provided on the stopper, and the positioning portion is used to cooperate with the positioning matching portion of the nuclear magnetic device to indicate the relative position of the disk body and the inner barrel in the circumferential direction of the disk body.

11. The shimming tool according to any one of claims 1 to 5, characterized in that: The middle bracket assembly includes: The central axis has its ends connected to corresponding fixing plates respectively and is provided with a placement groove extending along the axial direction of the central axis, and the placement groove has a plurality of fixing positions in the axial direction of the central axis; The detector has a length smaller than the length of the placement slot in the axial direction of the central axis, and a portion of the detector is embedded in the placement slot and connected to at least one fixing site.

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