Suspension device and magnetic resonance system

Abstract

The present application relates to a kind of suspension device and magnetic resonance system.The suspension device includes: suspension structure, including suspension support, first fixing part and first support, the suspension support has oppositely arranged first end and second end, the first support is supported to be connected to the first end or the second end of the suspension support, the first fixing part is supported in the inner container or outer container of low temperature holder in magnetic resonance system;Pre-tightening structure is rotatably connected with the first support, and abuts the first fixing part, the pre-tightening structure can drive the first support to move, to increase the distance between the first end and the second end.Increase the pre-tightening force of suspension support, it is convenient to increase the pre-tightening force of suspension support, guarantee that suspension support can reliably tension inner container and outer container.

Description

Technical Field

[0001] This invention relates to the field of magnetic resonance equipment technology, and in particular to a suspension device and a magnetic resonance system. Background Technology

[0002] Traditional superconducting magnets typically immerse the coil in a large amount of liquid helium within a cryogenic holder to maintain its cryogenic superconductivity. The cryogenic holder is a multi-layered container. An inner container, also at a low temperature, holds a cryogenic medium. At least one shielding layer for reflecting thermal radiation is placed in the cavity between the inner and outer containers. The inner container and the shielding layer are securely suspended from the outer container by support members (rings or rods). These suspension members are typically rods or rings with a large aspect ratio (small cross-sectional dimensions but long length).

[0003] Fiber-reinforced polymer (FRP) "racetrack-shaped" tie rods are a widely used type. The term "racetrack-shaped" refers to a design where the ends are typically semi-circular, while the middle section has parallel sides. In practical applications, the two semi-circular ends are connected to the inner and outer containers respectively, ensuring that they do not come into contact with each other while the tie ring bears the weight of the inner container and the impact loads during transportation. Simultaneously, the inner container of the cryogenic holder undergoes a cooling process from room temperature to cryogenic temperature. During this process, both the inner container and the support component undergo thermal contraction, causing a significant change in the tension of the support component. Generally, to prevent the tension of the support component from weakening under extreme conditions and affecting its ability to support the inner container, a large preload is applied during the manufacturing and assembly process of the cryogenic holder.

[0004] Generally, the preload of a single support component on a 1.5T superconducting magnet exceeds 4 tons. This preload can be applied via a drive mechanism such as a threaded tensioning or threaded lifting mechanism. However, the error in preload is often significant. For higher-field magnets, such as 3T or 5T superconducting magnets, the preload approaches 10T. Applying this preload manually becomes extremely difficult, posing a significant challenge to the entire assembly process. Summary of the Invention

[0005] Therefore, it is necessary to provide a suspension device and magnetic resonance system that can facilitate the application of preload, addressing the current problem of inconvenient application of pull ring preload.

[0006] A suspension device, comprising:

[0007] The suspension structure includes a suspension support, a first fixing member, and a first support member. The suspension support has a first end and a second end that are disposed opposite to each other. The first support member is supported and connected to the first end or the second end of the suspension support. The first fixing member is supported on the inner container or outer container of the cryogenic holder in the magnetic resonance system.

[0008] The pre-tightening structure is rotatably connected to the first support member and abuts against the first fixing member. The pre-tightening structure can drive the first support member to move, thereby increasing the distance between the first end and the second end.

[0009] In one embodiment, the pre-tensioning structure includes a tensioning member and a locking assembly. One end of the locking assembly is connected to the first support member. When the locking assembly is locked, it can lock the suspension support member. The tensioning member is rotatably connected to the first support member and abuts against the first fixing member. When the tensioning member rotates, it can drive the first support member and the locking assembly to move relative to the first fixing member.

[0010] In one embodiment, the tensioning member includes a cam portion and a support arm. The connection between the cam portion and the support arm has an adjustment hole, and the adjustment hole is rotatably connected to the first support member.

[0011] In one embodiment, the outer contour of the cam portion has a cam surface, and the center distance from the cam surface to the adjustment hole gradually increases.

[0012] In one embodiment, the locking assembly abuts against the first fixing member when locked, or the locking assembly abuts against the inner container or the outer container when locked.

[0013] In one embodiment, the first fixing member has a locking groove with a locking position, the locking assembly includes an adjusting member and a locking member, the adjusting member is connected to the first support member, the locking member is rotatably disposed on the adjusting member and located in the locking groove, and the locking member locks the suspension support member when it abuts against the locking position.

[0014] In one embodiment, the locking assembly includes a locking member, an adjusting member, and a limiting member. The locking member is rotatably disposed on the adjusting member, one end of which is connected to the first support member. The limiting member is disposed at the end of the locking member away from the tensioning member. When the limiting member abuts against the inner container or the outer container, it locks the suspension support member.

[0015] In one embodiment, the first fastener has a tension reference surface that abuts against the tensioning member, and the tension reference surface is a plane or a curved surface.

[0016] In one embodiment, the suspension device further includes a pad that is detachably placed between the tension reference surface and the tensioning member.

[0017] A magnetic resonance system includes a cryogenic holder and a superconducting coil disposed within the cryogenic holder; the cryogenic holder includes an inner container, an outer container, and a suspension device, the suspension device comprising:

[0018] The suspension structure includes a suspension support, a first fixing member, and a first support member. The suspension support has a first end and a second end that are disposed opposite to each other. The first support member is supported and connected to the first end or the second end of the suspension support. The first fixing member is supported on the inner container or outer container of the cryogenic holder in the magnetic resonance system.

[0019] A pre-tightening structure is connected to the first support member and abuts against the first fixing member. The pre-tightening structure can drive the first support member to move, thereby increasing the distance between the first end and the second end.

[0020] By adopting the above technical solution, the present invention has at least the following technical effects:

[0021] The suspension device and magnetic resonance system of the present invention include a pre-tensioning structure rotatably connected to a first support member and abutting against a first fixing member. One of the first and second ends of the suspension support member is fixedly disposed on one of the inner container and the outer container, while the other end is fitted with the first support member and the pre-tensioning structure and fixed to the other of the inner and outer containers by the first fixing member. When the pre-tensioning structure rotates, it can drive the first support member to move with the first fixing member as a fulcrum. When the first support member moves, one of the first and second ends moves relative to the other, thereby increasing the distance between the first and second ends and thus increasing the pre-tensioning force of the suspension support member. This effectively solves the problem of the inconvenience in increasing the pre-tensioning force of the pull ring, making it convenient to increase the pre-tensioning force of the suspension support member and ensuring that the suspension support member can reliably tension the inner container and the outer container. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the suspension device according to the first embodiment of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of the suspension device at the second end;

[0024] Figure 3 for Figure 2 A schematic diagram of the tensioner in the initial position of the suspension device shown;

[0025] Figure 4 for Figure 3 A schematic diagram showing the rotation of the tensioner;

[0026] Figure 5 for Figure 3 The diagram shows the tensioner moving from its initial position to its limit position.

[0027] Figure 6 for Figure 2 The diagram shows a suspension device with a pad added at the tensioner.

[0028] Figure 7 This is a schematic diagram of the suspension device at the second end according to the second embodiment of the present invention.

[0029] Wherein: 100, suspension device; 110, suspension structure; 111, suspension support; 1111, first end; 1112, second end; 112, first support; 113, first fixing member; 1113, locking groove; 1132, tensioning reference surface; 11131, locking position; 114, second support; 115, second fixing member; 120, pre-tensioning structure; 121, tensioning member; 1211, cam part; 12111, cam surface; 1212, support arm; 12121, operating end; 1213, adjusting hole; 122, locking assembly; 1221, locking member; 1222, adjusting member; 1223, limiting member; 130, pad; 200, fixing point; 300, fixing end. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] See Figure 1 and Figure 7 This invention provides a suspension device 100. The suspension device 100 is used in a cryogenic holder of a magnetic resonance imaging (MRI) system to connect the inner container and the outer container of the cryogenic holder. After connecting the inner container and the outer container, the suspension device 100 can reliably support the inner container within the outer container, ensuring that the inner container is stably positioned within the outer container.

[0037] Typically, the two ends of the suspension device 100 are connected to the inner container and the outer container, respectively. While ensuring that the inner container and the outer container do not come into contact, the suspension device 100 also needs to withstand the gravity load of the inner container and the impact load during transportation. Furthermore, the inner container of the cryogenic holder will undergo a cooling process from room temperature to low temperature. During this process, the inner container and the suspension device 100 will undergo thermal contraction, resulting in a significant change in tension.

[0038] To prevent the suspension device 100 from weakening under extreme conditions and affecting its ability to support the inner container, the preload of the suspension device 100 needs to be adjusted during the manufacturing and assembly of the cryogenic retainer. However, the preload of a single support component on a 1.5T (Tesla) superconducting magnet exceeds 4 tons. In this case, the preload can be applied manually using a drive mechanism such as a threaded tensioning or threaded lifting mechanism. However, the error in the preload is often significant. For higher field magnets such as 3T or 5T superconducting magnets, the preload approaches 10 tons. In this case, applying the preload manually becomes extremely difficult, posing a significant challenge to the entire assembly process.

[0039] The suspension device 100 of the present invention can easily adjust the preload, ensuring accurate adjustment of the preload while also facilitating the application of preload to the high-field magnet, thus achieving reliable support for the inner container and the outer container. The specific structure of the suspension device 100 is described below.

[0040] See Figure 1 and Figure 7 In one embodiment, the suspension device 100 includes a suspension structure 110 and a pre-tensioning structure 120. The suspension structure 110 includes a suspension support 111, a first fixing member 113, and a first support member 112. The suspension support 111 has a first end 1111 and a second end 1112 disposed opposite to each other. The first support member 112 is supported and connected to either the first end 1111 or the second end 1112 of the suspension support 111. The first fixing member 113 supports the inner or outer container of the cryogenic holder in the magnetic resonance system. The pre-tensioning structure 120 is rotatably connected to the first support member 112 and abuts against the first fixing member 113. The pre-tensioning structure 120 can drive the first support member 112 to move, thereby increasing the distance between the first end 1111 and the second end 1112.

[0041] The suspension structure 110 connects the inner container to the outer container. One end of the suspension structure 110 is connected to the inner container, and the other end is connected to the outer container. The suspension structure 110 supports the inner container within the outer container, providing reliable support. A pre-tightening structure 120 is located at one end of the suspension structure 110. The pre-tightening structure 120 can pre-tighten the suspension structure 110 by increasing the distance between its two ends, thereby applying a pre-tightening force to adjust the pre-tightening force. Optionally, the pre-tightening structure 120 can be located at either the end of the suspension structure 110 connected to the inner container or the end connected to the outer container. It is understood that the location of the pre-tightening structure 120 at any end of the suspension structure 110 is not limited in principle, as long as it enables the pre-tightening operation of the suspension structure 110.

[0042] Specifically, the suspension structure 110 includes a suspension support 111, a first support 112, and a first fixing member 113. The suspension support 111 has a first end 1111 and a second end 1112, which are disposed opposite to each other. One end of the first end 1111 and the second end 1112 of the suspension support 111 is fixedly connected to the inner container, and the other end is fixedly connected to the outer container, so that the suspension support 111 supports the inner container in the outer container. The first support 112 is disposed at either the first end 1111 or the second end 1112 of the suspension support 111, and the first fixing member 113 is disposed on the inner container or the outer container and connected to the first support 112 to fix the corresponding end of the suspension support 111.

[0043] The first support member 112 is used to connect the pre-tightening structure 120. The first support member 112 can be disposed at the first end 1111 of the suspension support member 111 or at the second end 1112 of the suspension support member 111. In this embodiment, the first support member 112 being disposed at the first end 1111 of the suspension support member 111 is used as an example for explanation. The principle of the first support member 112 being disposed at the second end 1112 of the suspension support member 111 is essentially the same as that of the first end 1111, and will not be described in detail here. It is worth noting that the structure and principle of the pre-tightening structure 120 being disposed at the first end 1111 of the suspension support member 111 are essentially the same as those of the pre-tightening structure 120 being disposed at the second end 1112. In this embodiment, only the first support member 112 of the pre-tightening structure 120 being disposed at the first end 1111 is used as an example for explanation.

[0044] See Figure 1 and Figure 7Furthermore, in this embodiment, the first end 1111 of the suspension support 111 is connected to the outer container, and the second end 1112 is connected to the inner container. The corresponding pre-tightening structure 120 is indirectly connected to the outer container through the first support 112 and the first end 1111. Optionally, the suspension structure 110 also includes a second support 114 and a second fixing member 115. The second fixing member 115 is disposed on the inner container, and the second support 114 is disposed on the second end 1112 of the suspension support 111. The second end 1112 of the suspension support 111 is connected to the second fixing member 115 through the second support 114 to fix the second end 1112 of the suspension support 111 to the inner container.

[0045] In other embodiments of the present invention, the pre-tightening structure 120 may also be indirectly connected to the inner container via the second end 1112; of course, the first end 1111 of the suspension support 111 may also be connected to the inner container and the second end 1112 may be connected to the outer container, which will not be described in detail here.

[0046] A first support member 112 is disposed after the first end 1111 of the suspension support member 111. A first fixing member 113 abuts against the outer container. A pre-tensioning structure 120 is rotatably connected to the first support member 112 and abuts against the first fixing member 113. When the pre-tensioning structure 120 rotates relative to the first support member 112, it can rotate around the position in contact with the first fixing member 113 as a fulcrum. Furthermore, when the pre-tensioning structure 120 rotates, it allows the first end 1111 of the suspension support member 111 to move relative to the second end 1112, thereby stretching the suspension support member 111 and applying a pre-tensioning force to it, thus adjusting the pre-tensioning force.

[0047] See Figure 1 and Figure 7 When the suspension device 100 of the present invention is in use, it is connected to the second support member 114 and the second fixing member 115, so that the second end 1112 of the suspension support member 111 is fixed to the inner container, and the pre-tightening structure 120 is connected to the first support member 112 at the first end 1111 of the suspension support member 111, and the pre-tightening device abuts against the first fixing member 113 of the outer container. At this time, rotating the pre-tightening structure 120, the pre-tightening structure 120 can rotate relative to the second support member 114 with the first fixing member 113 as the fulcrum. During the rotation, the pre-tightening structure 120 can drive the second support member 114 to rise, and then the second support member 114 can drive the second end 1112 of the suspension support member 111 to move away from the first end 1111, so as to increase the length of the suspension support member 111 and achieve the purpose of increasing the pre-tightening force.

[0048] The suspension device 100 of the present invention, by providing a pre-tightening structure 120 at the first end 1111 or the second end 1112 of the suspension support member 111, applies a pre-tightening force to the suspension support frame through the pre-tightening structure 120, thereby increasing the pre-tightening force of the suspension support member 111. This effectively solves the problem of the inconvenience in increasing the pre-tightening force of the pull ring, making it convenient to increase the pre-tightening force of the suspension support member 111 and ensuring that the suspension support member 111 can reliably tension the inner container and the outer container. Furthermore, the suspension device 100 of the present invention has a simple and compact structure. Through the cooperation of the suspension structure 110 and the pre-tightening structure 120, a large pre-tightening force can be easily applied, ensuring that the suspension support member 111 can reliably support the inner container in the outer container. After adding the pre-tightening structure 120 to the suspension device 100 of the present invention, fewer components can be used, making it convenient to apply a pre-tightening force to the suspension support member 111, which is particularly suitable for magnetic resonance systems that require a large pre-tightening force.

[0049] For example, the suspension support 111 is a pull ring. Correspondingly, the first support 112 and the second support 114 are semi-circular support blocks disposed at the ends of the pull ring. The first support 112 is driven by the pre-tightening structure 120 to achieve pre-tightening of the suspension support 111, which is a pull ring. Of course, in other embodiments of the present invention, the suspension support 111 may also be a rod-shaped structure, a strip-shaped structure, etc., and can also cooperate with the pre-tightening structure 120 to perform pre-tightening operations. Optionally, the structural form of the first fixing member 113 is not limited in principle, as long as it can achieve support of the pre-tightening structure 120 without interfering with the support member 111. Optionally, the first fixing member 113 is a fixing block or a fixing plate, etc.

[0050] See Figure 1 , Figure 2 and Figure 7 In one embodiment, the pre-tightening structure 120 includes a tensioning member 121 and a locking assembly 122. One end of the locking assembly 122 is connected to the first support member 112. When the locking assembly 122 is locked, it can lock the suspension support member 111. The tensioning member 121 is rotatably connected to the first support member 112 and abuts against the first fixing member 113. When the tensioning member 121 rotates, it can drive the first support member 112 and the locking assembly 122 to move relative to the first fixing member 113.

[0051] Tensioner 121 is the operating component of pretensioning structure 120. Tensioner 121 is rotatably connected to first support 112. The end of tensioner 121 extends away from first support 112, and the surface of tensioner 121 can abut against first fixing member 113. That is, the end of tensioner 121 away from first support 112 is operating end 12121. When operating end 12121 is operated, it can cause tensioner 121 to rotate relative to first support 112 with first fixing member 113 as fulcrum, thereby pulling the first end 1111 of suspension support 111, increasing the length of both ends of suspension support 111, and applying pretension force to suspension support 111.

[0052] One end of the locking assembly 122 is connected to the first support member 112. When the first support member 112 moves, it can drive the locking assembly 122 to move synchronously. The locking assembly 122 is used to lock the suspension support member 111, so that the first end 1111 of the suspension support member 111 is kept in the pre-tightened position, thereby achieving the pre-tightening of the suspension support member 111. Specifically, after the tensioner 121 adjusts the pre-tightening force of the suspension support member 111, the locking assembly 122 is operated to lock the suspension support member 111, preventing the suspension support member 111 from retracting, so that the suspension support member 111 can generate pre-tightening force to reliably support the suspension support member 111.

[0053] See Figure 1 and Figure 2 In the first embodiment of the present invention, the locking assembly 122 abuts against the first fixing member 113 when locked. Exemplarily, the first fixing member 113 is actually fixed to the outer container. When locked, the locking assembly 122 abuts against the first fixing member 113 to restrict the position of the first end 1111 of the suspension support member 111. Specifically, after the locking assembly 122 moves with the first support member 112, adjusting the position of the locking assembly 122 allows it to abut against the first fixing member 113. By restricting the position of the locking assembly 122 through the first fixing member 113, the position of the locking assembly 122 is restricted, thereby limiting the movement of the first end 1111 of the suspension support member 112 towards the second end 1112, i.e., preventing the suspension support member 111 from retracting.

[0054] See Figure 7In a second embodiment of the present invention, the locking component 122 abuts against the inner container or the outer container when locked. Exemplarily, a fixed end 300 is provided on the outer container. When the locking component 122 is locked, the end of the locking component 122 away from the first support member 112 can abut against the fixed end 300 to restrict the position of the first end 1111 of the suspension support member 111. Specifically, after the locking component 122 moves with the first support member 112, the position of the locking component 122 is adjusted so that the locking component 122 can abut against the fixed end 300. The fixed end 300 restricts the position of the locking component 122, thereby restricting the first end 1111 of the suspension support member 111 from driving the first support member 112 toward the second end 1112, i.e., preventing the suspension support member 111 from retracting.

[0055] It is understandable that the tensioning member 121 has essentially the same structure in the first and second embodiments, only the structure of the locking component 122 and the limiting position of the locking component 122 when locked are different. The specific structure and locking principle of the locking component 122 in the two embodiments are described below.

[0056] See Figure 1 and Figure 2 In the first embodiment of the present invention, the locking assembly 122 is limited by the first fixing member 113. When the locking assembly 122 is locked, it can abut against the first fixing member 113. The first fixing member 113 is fixedly connected to the outer container. At this time, the first fixing member 113 can both provide rotational support for the tensioning member 121 and limit the locking assembly 122. Figure 2 In the middle, the outer container includes a fixing point 200, and the first fixing member 113 is fixed on the fixing point 200, thus realizing the fixing of the first fixing member 113 and the outer container.

[0057] See Figure 1 and Figure 2 In one embodiment, the first fixing member 113 has a locking groove 1113 with a locking position 11131. The locking assembly 122 includes an adjusting member 1222 and a locking member 1221. The adjusting member 1222 is connected to the first support member 112. The locking member 1221 is rotatably disposed on the adjusting member 1222 and located in the locking groove 1113. When the locking member 1221 abuts against the locking position 11131, it locks the suspension support member 111.

[0058] The first fixing member 113 is fixedly disposed at the fixing point 200 of the outer container. One end of the adjusting member 1222 is connected to the first support member 112, and the other end of the adjusting member 1222 extends toward the stretching direction of the suspension support member 111. That is, the length direction of the adjusting member 1222 is consistent with the length direction of the suspension support member 111. A locking groove 1113 is formed on the first fixing member 113 along the length direction perpendicular to the adjusting member 1222. The locking groove 1113 extends along the length direction of the adjusting member 1222.

[0059] The dimension of the locking groove 1113 along the length of the adjusting member 1222 is larger than the dimension of the locking member 1221 along the length of the adjusting member 1222. The locking groove 1113 provides movement space for the locking member 1221 to move along the adjusting member 1222, that is, when the locking member 1221 moves along the adjusting member 1222, the locking member 1221 can move freely in the locking groove 1113. The inner wall of the locking groove 1113 away from the suspension support member 111 is the locking position 11131. When the locking member 1221 abuts against the locking position 11131, it indicates that the locking member 1221 is in the locked state. The first fixing member 113 restricts the adjusting member 1222 from moving toward the second end 1112 of the suspension support member 111 through the abutment of the locking position 11131 and the locking member 1221, thereby restricting the retraction of the first support member 112 and the first end 1111 of the suspension support member 111, so that the suspension support member 111 remains in a pre-tightened state.

[0060] When the tensioning member 121 rotates relative to the first support member 112 with the first fixing member 113 as the fulcrum, the tensioning member 121 can stretch the suspension support member 111 through the first support member 112, causing the first end 1111 of the suspension support member 111 to move away from the second end 1112. When the first support member 112 moves, it can drive the adjusting member 1222 and its locking member 1221 to move synchronously, and the locking member 1221 moves in the locking groove 1113. When the tensioning member 121 is pre-tensioned to the position, the tensioning member 121 stops rotating. At this time, the adjusting locking member 1221 moves along the adjusting member 1222 away from the first end 1111 of the suspension support member 111, so that the locking member 1221 abuts against the locking position 11131 of the locking groove 1113.

[0061] Subsequently, the tensioner 121 is released. Since the first fixing member 113 is fixed to the outer container, and the locking member 1221 abuts against the locking position 11131 of the first fixing member 113, the position of the locking member 1221 is fixed. The locking member 1221 can lock the position of the first support member 112 through the adjusting member 1222, thereby fixing the position of the first end 1111 of the suspension support member 111, so that the suspension support member 111 remains in the pre-tightened state. This completes one pre-tightening operation of the suspension support member 111. Of course, the tensioner 121 can reciprocate to achieve multiple pre-tightening operations of the suspension support member 111, which will be mentioned later. However, no matter how the tensioner 121 moves, the movement between the locking member 1221, the adjusting member 1222, and the first fixing member 113 is as described above, and will not be repeated hereafter.

[0062] For example, such as Figure 1 and Figure 2 As shown, the first fixing member 113 has a guide hole extending along the length direction of the suspension support member 111. The first support member 112 is located in the guide hole, which communicates with the locking groove 1113. The adjusting member 1222 is located in the guide hole, and the locking member 1221 is located in the locking groove 1113. At this time, the first support member 112 can move along the guide hole, preventing the suspension support member 111 from shifting or displacing during pre-tensioning.

[0063] Of course, in other embodiments of the present invention, the first support member 112 may also be located on the side of the first fixing member 113. Correspondingly, the adjusting member 1222 and the locking member 1221 are located on the side of the first fixing member 113, and the outer wall of the locking member 1221 can extend into the locking groove 1113 of the first fixing member 113, so that the locking of the suspension support member 111 after pre-tightening can also be achieved.

[0064] Optionally, the adjusting member 1222 is a bolt, and the locking member 1221 is a nut. The adjusting member 1222, which is a bolt, can drive the locking member 1221, which is a nut, to move synchronously. After moving along the adjusting member 1222, the locking member 1221 abuts against the locking position 11131 of the locking groove 1113, thereby locking the suspension support 111 after pre-tightening. Of course, in other embodiments of the present invention, the adjusting member 1222 and the locking member 1221 can also be other structures capable of locking the suspension support 111.

[0065] See Figures 1 to 5In one embodiment, the tensioning member 121 includes a cam portion 1211 and a support arm 1212. The cam portion 1211 and the support arm 1212 are connected together. The connection between the support arm 1212 and the cam portion 1211 has an adjustment hole 1213, and the adjustment hole 1213 is rotatably connected to the first support member 112. The length of the support arm 1212 is greater than the length of the cam portion 1211.

[0066] After the tensioning member 121 is rotatably connected to the first support member 112 through the adjusting hole 1213, the tensioning member 121 can form a lever structure. Taking the contact point between the cam portion 1211 and the first fixing member 113 as the fulcrum, when the support arm 1212 rotates around the adjusting hole 1213, the support arm 1212 can drive the cam portion 1211 to rotate around the adjusting hole 1213. When the cam portion 1211 rotates, the surface of the cam portion 1211 can gradually contact the first fixing member 113, which will increase the distance between the adjusting hole 1213 and the first fixing member 113, thereby causing the suspension support member 111 to lengthen and achieve pre-tensioning of the suspension support member 111.

[0067] Furthermore, the length of the cam portion 1211 is smaller than the length of the support arm 1212, and the operating end 12121 of the tensioning member 121 is located at the end of the support arm 1212 away from the cam portion 1211. That is, the distance from the end of the support arm 1212 to the adjustment hole 1213 is greater than the distance from the end of the cam portion 1211 to the adjustment hole 1213. This makes the tensioning member 121 act as a force-saving lever, achieving the purpose of saving effort when operating the support arm 1212 to rotate around the adjustment hole 1213, which facilitates the pre-tensioning of the suspension support 111, especially suitable for magnetic resonance systems with large pre-tensioning forces.

[0068] Optionally, the first support member 112 has a mounting hole corresponding to the adjustment hole 1213, and the pretensioning structure 120 further includes a connector. The connector passes through the adjustment hole 1213 and the mounting hole to form a rotating pair, thereby realizing a rotational connection between the first support member 112 and the tensioning member 121. Optionally, the connector can be a threaded part, a pin, a shaft, etc.

[0069] See Figures 1 to 5 In one embodiment, the outer contour of the cam portion 1211 has a cam surface 12111, the center distance from the cam surface 12111 to the adjustment hole 1213 gradually increases, and the center distance between the cam surface 12111 and the adjustment hole 1213 is the smallest when the tensioner 121 is in the initial position.

[0070] From the initial position where the tensioner 121 contacts the first fixing member 113 to the pre-tensioned position of the tensioner 121, the center distance between the cam surface 12111 of the cam portion 1211 and the center distance between the cam surface 12111 and the adjusting hole 1213 gradually changes, with a minimum value of r1 and a maximum value of r2. Furthermore, in the initial position, the center distance between the contact position of the cam surface 12111 and the first fixing member 113 and the center distance between the cam surface 12111 and the adjusting hole 1213 is the minimum value r1, and in the pre-tensioned position, the center distance between the contact position of the cam surface 12111 and the first fixing member 113 and the center distance between the cam surface 12111 and the adjusting hole 1213 is the maximum value r2.

[0071] When the tensioning member 121 rotates around the adjusting hole 1213 with the first fixing member 113 as the support point, the center distance between the contact position of the cam surface 12111 and the first fixing member 113 and the adjusting hole 1213 gradually increases. That is, during the rotation of the tensioning member 121, the distance between the adjusting hole 1213 and the first fixing member 113 will gradually increase, that is, the tensioning member 121 will drive the first end 1111 of the first support member 112 and the suspension support member 111 to move away from the second end 1112, so as to lengthen the suspension support member 111 and achieve the pre-tensioning of the suspension support member 111.

[0072] Optionally, the cam surface 12111 is a convex cam surface, which allows the center distance between the cam portion 1211 and the adjusting hole 1213 to gradually increase. Of course, in other embodiments of the present invention, the cam surface 12111 of the cam portion 1211 may also be other surfaces capable of applying preload.

[0073] See Figures 1 to 5 In one embodiment, the first fixing member 113 has a tensioning reference surface 1132, which abuts against the tensioning member 121. The tensioning reference surface 1132 is either a plane or a curved surface. That is, when the tensioning member 121 abuts against the first fixing member 113, the tensioning member 121 contacts the tensioning reference surface 1132 of the first fixing member 113 and rotates around the tensioning reference surface 1132 as a support point, thereby achieving pre-tensioning of the suspension support member 111. Furthermore, the tensioning reference surface 1132 has a specific shape, such as a plane or a curved surface, to reduce the contact area with the tensioning member 121. This reduces the frictional force when the tensioning member 121 rotates, facilitating its rotation.

[0074] Correspondingly, lubricating grease or the like can be applied between the tensioning member 121 and the tensioning reference surface 1132 to reduce the friction between them and facilitate the application of the preload.

[0075] See Figures 1 to 5 The pre-tightening steps of the pre-tightening structure 120 on the suspension support 111 are as follows:

[0076] The second end 1112 of the suspension support 111 is connected to the inner container via the second support 114 and the second fixing member 115. The first support 112 is installed at the first end 1111. The tensioning member 121 is rotatably connected to the first support 112 and abuts against the second fixing member 115. This completes the assembly of the suspension structure 110 and the pretensioning structure 120.

[0077] Subsequently, an upward driving force F1 is applied to the operating end 12121 of the tensioning member 121, causing the tensioning member 121 to rotate around the adjusting hole 1213. At this time, the cam surface 12111 of the tensioning member 121 contacts the tensioning reference surface 1132 of the first fixing member 113, forming a support point for the lever. As the driving force F1 of the tensioning member 121 increases, the operating end 12121 rises, causing the tensioning member 121 to rotate around the support point, and driving the first support member 112 to rise through the connector at the adjusting hole 1213.

[0078] When the first support member 112 rises, it will drive the first end 1111 of the suspension support member 111 to rise. At this time, the second end 1112 of the suspension support member 111 is fixed, that is, the suspension support member 111 is stretched along its length, generating a preload force F. x .

[0079] As the driving force of the tensioning member 121 continuously increases, the tensioning member 121 drives the first support member 112 and the first end 1111 of the suspension support frame to rise continuously until the set preload value F0 is reached. At this time, the adjustment hole 1213 of the tensioning member 121 rises by h0, and the elongation of the suspension support member 111 is h0; at the same time, the operating end 12121 of the tensioning member 121 rises by h1. Keeping the driving force of the tensioning member 121 constant, adjusting the position of the locking member 1221 on the adjusting member 1222 to the locking position 11131 of the first fixing member 113 and locking the locking member 1221 can keep the positions of the adjusting member 1222 and the first support member 112 from changing. When the driving force of the tensioning member 121 is released, the adjusting member 1222 and the mating member are fixed in position relative to the first fixed member due to the locking effect of the locking member 1221. They cannot retract, thus ensuring that the tension of the suspension support member 111 is locked at F0. The tension F0 on the suspension support member 111 will be transmitted to the first fixed member 113 through the adjusting member 1222 and the locking member 1221, thus completing the pre-tightening process.

[0080] In this process, for the cam portion 1211 of the tensioner 121, the lever arm of the preload F0 relative to the support point is L0, and the lever arm of the driving force F1 is L1. According to the lever principle, we have:

[0081] F0×L0=F1×L2

[0082]

[0083] Correspondingly, the heights h1 and h0 of the operating end 12121 of the tensioning member 121 and the adjusting hole 1213 also satisfy the following conditions:

[0084]

[0085] Typically, the preload force F0 is very large, such as around 40,000 N for a 1.5T superconducting magnet, making it difficult to apply manually. However, in the above structure, since L1 is greater than L0, typically about 20 times it, the required driving force F1 calculated according to the above formula is only about 2,000 N, significantly reducing the driving force. Furthermore, during the tensioning process, the support point is also subjected to considerable friction. With the cam portion 1211 used in the tensioning member 121, the friction on the cam surface 12111 is reduced, making it easier to apply the driving force.

[0086] Optionally, an extension rod can be provided at the operating end 12121 of the tensioner 121 to further increase the lever arm L1, so that the driving force F1 only needs to be a few hundred Newtons, and the pretension can be easily applied manually.

[0087] Optionally, there may be multiple tensioning elements 121, each with a different cam portion 1211. This allows for the replacement of a suitable tensioning element 121 based on the preload of the suspension support 111. In other words, by setting different cam portion 121 dimensions, the lever arm, the required driving force, and the elongation h0 of the suspension support 111 during a single action can be changed.

[0088] Understandably, as the tensioner 121 rises and rotates around the support point, the lever arm L1 of the driving force F1 will gradually decrease, while the required driving force F1 will increase. Therefore, the tensioner 121 will generally not be driven to the extreme position shown in the figure, but will only be applied within a small range (such as a 30° rotation angle) near the initial position of the tensioner 121.

[0089] Applying a driving force within the aforementioned range typically only lifts the first end 1111 by a small amount (h0). However, in some applications, the preload of the suspension support 111 is large, or its stiffness is low, resulting in a large deformation that the suspension support 111 needs to lift. After a single lift, the tensioning member 121 has reached the limit of the tension range and cannot continue to tension. In this case, the tensioning member 121 with a different cam surface 12111 or a larger tension range can be used, repeating the tension-locking-tensioning-locking... process until the suspension support 111 reaches the set preload.

[0090] See Figure 1 , Figure 2 and Figure 6In another embodiment, the suspension device 100 further includes a pad 130, which is detachably placed between the tension reference surface 1132 and the tensioning member 121. After the tensioning member 121 drives the first support member 112 and the first end 1111 of the suspension support member 111 to complete the first tensioning, and then abuts against the locking position 11131 through the locking member 1221 to complete the locking of the suspension support member 111, the tensioning member 121 is released to reset the tensioning member 121. At this time, there is a certain gap between the tensioning member 121 and the tension reference surface 1132 of the first fixing member 113. After adding the pad 130 at the tension reference surface 1132, the tensioning member 121 can abut against the first fixing member 113 again. At this time, repeating the tensioning and locking process described above can complete the re-pre-tensioning operation of the suspension support member 111.

[0091] When the required preload force for the suspension support 111 is large, the tensioning-locking-adding pad 130-tensioning-locking... process is repeated until the set preload force is reached, thus completing the preload operation of the suspension support 111. Furthermore, after the first tensioning process is completed, the tensioning member 121 with a different cam surface 12111 or a larger tensioning range can be replaced, and the tensioning-locking-adding pad 130-tensioning-locking... process can be repeated until the set preload force is reached.

[0092] In one embodiment, the driving force F1 applied to the operating end 12121 of the tensioner 121 can be assisted by a screw, a screw jack, or a hydraulic cylinder, which can greatly improve the driving capability. Furthermore, this assisted structure can be removed after the suspension support 111 is pre-tensioned.

[0093] Optionally, the pre-tightening structure 120 also includes an anti-loosening component, which is disposed between the locking component 1221 and the adjusting component 1222 to prevent loosening between the locking component 1221 and the adjusting component 1222, thus ensuring the locking effect. Optionally, the anti-loosening component may be an anti-loosening nut, a set screw, fastening adhesive, etc.

[0094] See Figure 1 and Figure 7 In the second embodiment, the first fixing member 113 provides support for the rotation of the tensioning member 121. The fixed end 300 is disposed in the outer container or is part of the outer container. When the locking assembly 122 is locked, the end of the locking assembly 122 can abut against the fixed end 300, thereby limiting the locking assembly 122. In this embodiment, the first fixing member 113 provides support for the rotation of the tensioning member 121. Since the locking assembly 122 has already restricted the first position of the suspension support member 111, the first fixing member 113 can be removed at this time. The suspension support member 111 can be kept in the pre-tightened state by the cooperation of the locking assembly 122 and the fixed end 300.

[0095] In one embodiment, the locking assembly 122 includes a locking member 1221, an adjusting member 1222, and a limiting member 1223. The locking member 1221 is rotatably disposed on the adjusting member 1222. One end of the adjusting member 1222 is connected to the first support member 112. The limiting member 1223 is disposed at the end of the locking member 1221 away from the tensioning member 121. When the limiting member 1223 abuts against the inner container or the outer container, it locks the suspension support member 111.

[0096] The first fixing member 113 is supported at the fixing point 200 of the outer container. One end of the adjusting member 1222 is connected to the first supporting member 112, and the other end of the adjusting member 1222 extends toward the stretching direction of the suspension support member 111. That is, the length direction of the adjusting member 1222 is consistent with the length direction of the suspension support member 111. A limiting member 1223 is provided at the end of the locking member 1221 away from the first end 1111 of the suspension support member 111. When the locking member 1221 moves toward the first end 1111 of the suspension support member 111, the limiting member 1223 can abut against the fixing end 300, indicating that the locking member 1221 is in a locked state. The abutment between the locking member 1221 and the fixing end 300 restricts the movement of the first supporting member 112 toward the first end 1111 of the suspension support member 111, thereby restricting the retraction of the first supporting member 112 and the first end 1111 of the suspension support member 111, so that the suspension support member 111 remains in a pre-tightened state.

[0097] It is worth noting that in the second embodiment, the structure and working principle of the locking member 1221, the adjusting member 1222, and the tensioning member 121 are substantially the same as those in the first embodiment. They will not be described in detail here, but only the differences between the second embodiment and the first embodiment will be explained.

[0098] When the tensioning member 121 and the first fixing member 113 rotate relative to the first support member 112, the tensioning member 121 can stretch the suspension support member 111 through the first support member 112, causing the first end 1111 of the suspension support member 111 to move away from the second end 1112. When the first support member 112 moves, it can drive the adjusting member 1222 and its locking member 1221 to move synchronously. When the locking member 1221 moves, it drives the limiting member 1223 to move synchronously. When the tensioning member 121 is pre-tightened to the desired position, the tensioning member 121 stops rotating. At this time, the locking member 1221 is rotated to move away from the first end 1111 of the suspension support member 111 until the limiting member 1223 abuts against the fixing end 300. At this time, the pre-tightening operation of the suspension support member 111 is completed.

[0099] In this embodiment, after the suspension support 111 is pre-tightened, the tensioning member 121 can be removed, so that the tensioning member 121 does not occupy additional space. Furthermore, the first fixing member 113 can also be disassembled after pre-tightening, further reducing costs. Optionally, the limiting member 1223 is a sleeve, a limiting block, or other structure that can perform a limiting function.

[0100] See Figures 1 to 7 The suspension device 100 of the present invention drives the first support member 112 to rotate relative to the first fixing member 113 via the tensioning member 121, which can lengthen the suspension support member 111, thereby increasing the distance between the first end 1111 and the second end 1112 of the suspension support member 111, achieving the purpose of pre-tightening the suspension support member 111. Furthermore, different pre-tightening forces can be applied to the suspension support member 111 by replacing the tensioning member 121 with different tension ranges or different sizes of cam surfaces 12111. Moreover, the pre-tightening operation of the suspension support member 111 can be repeated by adding a shim 130 until the pre-tightening force of the suspension support member 111 reaches a set value.

[0101] The suspension device 100 of the present invention employs a pre-tensioning structure 120 to pre-tension the suspension support 111, facilitating the application of pre-tensioning force to the suspension support 111 and achieving labor-saving results, allowing for easy application of pre-tensioning force. Furthermore, the pre-tensioning structure 120 can apply a large pre-tensioning force to the suspension support 111, ensuring that the suspension support 111 meets the support requirements of the internal container in a high-field magnetic resonance system. Additionally, the tensioning member 121 and even the aforementioned fixing member 113 can be removed after the tensioning operation and reused as tooling, significantly saving space in the cryogenic container while reducing manufacturing costs.

[0102] The present invention also provides a magnetic resonance system, including a cryogenic holder and a superconducting coil disposed in the cryogenic holder; the cryogenic holder includes an inner container, an outer container, and a suspension device 100, the suspension device 100 including a suspension structure 110 and a pre-tightening structure 120. The suspension structure 110 includes a suspension support 111, a first fixing member 113, and a first support member 112. The suspension support 111 has a first end 1111 and a second end 1112 disposed opposite to each other. The first support member 112 is supported and connected to the first end 1111 or the second end 1112 of the suspension support 111. The first fixing member 113 is supported on the inner container or the outer container of the cryogenic holder in the magnetic resonance system. The pre-tightening structure 120 is connected to the first support member 112 and abuts against the first fixing member 113. The pre-tightening structure 120 can drive the first support member 112 to move, thereby increasing the distance between the first end 1111 and the second end 1112.

[0103] The suspension device 100 here is the same as the suspension device 100 in the above embodiments, and will not be described in detail here. The magnetic resonance system uses a cryostat to maintain the temperature of the superconducting coil, ensuring it remains in a good "superconducting" state and thus guaranteeing its normal operation. When the magnetic resonance system of the present invention uses the suspension device 100 of the above embodiments, the preload of the suspension support 111 can be adjusted, allowing the suspension support 111 to reliably support the inner container.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A suspension device (100), characterized in that, include: The suspension structure (110) includes a suspension support (111), a first fixing member (113), and a first support member (112). The suspension support member (111) has a first end (1111) and a second end (1112) disposed opposite to each other. The first support member (112) is supported and connected to the first end (1111) or the second end (1112) of the suspension support member (111). The first fixing member (113) is supported on the inner or outer container of the cryogenic holder in the magnetic resonance system. The pre-tightening structure (120) is rotatably connected to the first support member (112) and abuts against the first fixing member (113). The pre-tightening structure (120) can drive the first support member (112) to move, thereby increasing the distance between the first end (1111) and the second end (1112). The pre-tightening structure (120) includes a tensioning member (121) and a locking assembly (122). One end of the locking assembly (122) is connected to the first support member (112). When the locking assembly (122) is locked, it can lock the suspension support member (111). The tensioning member (121) is rotatably connected to the first support member (112) and abuts against the first fixing member (113). When the tensioning member (121) rotates, it can drive the first support member (112) and the locking assembly (122) to move relative to the first fixing member (113). The tensioning member (121) includes a cam portion (1211) and a support arm (1212). The cam portion (1211) and the support arm (1212) have an adjustment hole (1213) at the connection between the support arm (1212) and the cam portion (1211), and the adjustment hole (1213) is rotatably connected to the first support member (112).

2. The suspension device (100) according to claim 1, characterized in that, The outer contour of the cam portion (1211) has a cam surface (12111), and the center distance from the cam surface (12111) to the adjustment hole (1213) gradually increases.

3. The suspension device (100) according to claim 2, characterized in that, When the locking assembly (122) is locked, it abuts against the first fixing member (113), or the locking assembly (122) abuts against the inner container or the outer container when locked.

4. The suspension device (100) according to claim 3, characterized in that, The first fixing member (113) has a locking groove (1113) with a locking position (11131). The locking assembly (122) includes an adjusting member (1222) and a locking member (1221). The adjusting member (1222) is connected to the first support member (112). The locking member (1221) is rotatably disposed on the adjusting member (1222) and located in the locking groove (1113). When the locking member (1221) abuts against the locking position (11131), the suspension support member (111) is locked.

5. The suspension device (100) according to claim 3, characterized in that, The locking assembly (122) includes a locking member (1221), an adjusting member (1222), and a limiting member (1223). The locking member (1221) is rotatably disposed on the adjusting member (1222). One end of the adjusting member (1222) is connected to the first support member (112). The limiting member (1223) is disposed at the end of the locking member (1221) away from the tensioning member (121). When the limiting member (1223) abuts against the inner container or the outer container, it locks the suspension support member (111).

6. The suspension device (100) according to any one of claims 1 to 5, characterized in that, The first fixing member (113) has a tensioning reference surface (1132), which abuts against the tensioning member (121), and the tensioning reference surface (1132) is a plane or a curved surface.

7. The suspension device (100) according to claim 6, characterized in that, The suspension device (100) also includes a pad (130), which is detachably placed between the tension reference surface (1132) and the tensioning member (121).

8. A magnetic resonance system, characterized in that, The system includes a cryogenic holder and a superconducting coil, the superconducting coil being disposed within the cryogenic holder; the cryogenic holder includes an inner container, an outer container, and a suspension device (100), the suspension device (100) comprising: The suspension structure (110) includes a suspension support (111), a first fixing member (113), and a first support member (112). The suspension support member (111) has a first end (1111) and a second end (1112) disposed opposite to each other. The first support member (112) is supported and connected to the first end (1111) or the second end (1112) of the suspension support member (111). The first fixing member (113) is supported on the inner or outer container of the cryogenic holder in the magnetic resonance system. A pre-tightening structure (120) is connected to the first support member (112) and abuts against the first fixing member (113). The pre-tightening structure (120) can drive the first support member (112) to move, thereby increasing the distance between the first end (1111) and the second end (1112). The pre-tightening structure (120) includes a tensioning member (121) and a locking assembly (122). One end of the locking assembly (122) is connected to the first support member (112). When the locking assembly (122) is locked, it can lock the suspension support member (111). The tensioning member (121) is rotatably connected to the first support member (112) and abuts against the first fixing member (113). When the tensioning member (121) rotates, it can drive the first support member (112) and the locking assembly (122) to move relative to the first fixing member (113). The tensioning member (121) includes a cam portion (1211) and a support arm (1212). The cam portion (1211) and the support arm (1212) have an adjustment hole (1213) at the connection between the support arm (1212) and the cam portion (1211), and the adjustment hole (1213) is rotatably connected to the first support member (112).

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