Hoisting tooling and hoisting method of the side ring cold screen at the bottom of the dewar

Abstract

The present invention relates to the technical field of nuclear fusion devices and discloses a hoisting fixture and hoisting method for a cold shield at the bottom side ring of a dewar. The hoisting fixture comprises a hoisting frame and a hoisting fixture. The hoisting frame includes a main fixing frame and two temporary fixing frames. The main fixing frame includes a plurality of main legs spaced apart along an arc, each main leg being provided with a main fixing assembly for fixing an arcuately adjacent cold shield. The two temporary fixing frames are detachably fixed to the arcuate ends of the main fixing frame and each includes a temporary leg spaced apart from the main leg along the arc, each temporary leg being provided with a temporary fixing assembly for fixing the arcuate outer end of the corresponding end cold shield. One end of the hoisting fixture is connected to the top of the main fixing frame, and the other end of the hoisting fixture is used to connect to a crane. The hoisting fixture for the cold shield at the bottom side ring of a dewar according to the present invention is suitable for hoisting cold shields of different sizes and weights, while ensuring the stability and installation accuracy of the cold shields during the hoisting process.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear fusion devices, in particular to a hoisting tool and a hoisting method for a side ring cold screen at the bottom of a dewar. Background Art

[0002] The cold shield at the bottom side ring of the dewar is a key component of the nuclear fusion device. It can provide thermal shielding for low-temperature superconducting magnets and other low-temperature components, and reduce the heat load on superconducting magnets and low-temperature components caused by thermal radiation or heat conduction.

[0003] In the existing technology, in order to reduce the difficulty of hoisting the side ring cold shield at the bottom of the dewar, the side ring cold shield at the bottom of the dewar is usually divided into 1 / 4 and 7 / 32 sectors for sequential hoisting. However, the 1 / 4 sector still has problems such as large size (8.5m*4.5m*3m), heavy weight (2.5 tons), high installation precision in multiple directions (adjustment accuracy is 0.5mm), and narrow hoisting space (38mm gap with gravity support). At the same time, a counterweight structure needs to be added to ensure that the 1 / 4 sector does not tilt during the hoisting process, resulting in conventional hoisting tools and methods being unable to meet the hoisting requirements of the side ring cold shield at the bottom of the dewar. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a hoisting fixture for a Dewar bottom side ring cold shield. The hoisting fixture can be used to hoist cold shields of different sizes and weights while ensuring the stability and installation accuracy of the cold shield. This solves the technical problem that prior hoisting fixtures cannot meet the requirements of hoisting Dewar bottom side ring cold shields of different sizes and weights.

[0005] The present invention also aims to provide a hoisting method with the hoisting tooling.

[0006] According to an embodiment of the present invention, the lifting tool of the Dewar bottom side ring cold screen includes: a lifting frame, the lifting frame includes a main fixing frame and two temporary fixing frames; the main fixing frame includes a plurality of main legs distributed at intervals along the arc direction, each of the main legs is provided with a main fixing component for fixing two arc-adjacent cold screens; the two temporary fixing frames are detachably fixed to the arc-direction ends of the main fixing frame, and each includes a temporary leg spaced from the main leg along the arc direction, each temporary leg is provided with a temporary fixing component for fixing the arc-direction outer end of the cold screen located at the end; a sling, one end of the sling is connected to the top of the main fixing frame, and the other end of the sling is used to be connected to a crane.

[0007] The lifting fixture of the Dewar bottom side ring cold screen according to the embodiment of the present invention can be suitable for the lifting of cold screens of different sizes and weights by providing a main fixing frame and two temporary fixing frames. At the same time, a main fixing component for fixing two arc-adjacent cold screens is provided on each main support leg to avoid deformation of the cold screen during the lifting process, thereby ensuring the stability and installation accuracy of the cold screen. In addition, by detachably fixing the two temporary fixing frames to the arc-shaped ends of the main fixing frame respectively, on the one hand, the temporary fixing frames can be used to fix the cold screen at the end, ensuring that the cold screen at the end can also remain horizontal during the lifting process, avoiding deformation of the cold screen at the end, thereby improving the installation accuracy of the cold screen. On the other hand, the detachable fixation makes it easy to remove the temporary fixing frame before adjusting the cold screen in the foundation pit, so as to avoid affecting the adjustment of the cold screen.

[0008] In some embodiments, on each of the main legs, the main fixing assembly includes a clamping structure respectively located at the upper, middle and lower parts of the main legs, the clamping structure includes a first fixing plate, a first pin key and a clamping block, the first fixing plate is fixed to the main leg, the clamping block is detachably fixed to the first fixing plate, the clamping block is used to fix two arc-adjacent cold screens, and the first pin key is arranged between the first fixing plate and the clamping block to limit the horizontal movement of the clamping block.

[0009] In some embodiments, the main fixing assembly also includes a bracket structure located below the clamping structure at the lower part of the main support leg, the bracket structure includes a second fixing plate, a second pin key and a support plate, the second fixing plate is fixed on the main support leg, the support plate is detachably fixed on the second fixing plate, the support plate is used to support two adjacent cold screens in an arc direction, and the second pin key is arranged between the second fixing plate and the support plate to limit the horizontal movement of the support plate.

[0010] In some embodiments, on each of the temporary legs, the temporary fixing assembly includes fixing blocks respectively located at the upper, middle and lower parts of the temporary legs, and the fixing blocks are used to fix to the arc-shaped outer ends of the cold screen at the ends.

[0011] In some embodiments, the fixing block includes a third vertical plate and a fourth vertical plate connected in an L-shape, the third vertical plate is fixed to the temporary support leg, and a temporary fixing hole is provided on the fourth vertical plate, and the arc-shaped outward end of the cold screen is fixed to the fourth vertical plate through the temporary fixing hole.

[0012] In some embodiments, the main body fixing frame includes horizontal frames located at the upper, middle and lower parts; each of the horizontal frames includes an arc-shaped beam, a radial beam and a connecting beam, wherein the connecting beam is located on the inner side of the arc-shaped beam, one end of the radial beam is fixedly connected to the arc-shaped beam, and the other end of the radial beam is fixedly connected to the connecting beam; the arc-shaped beam is fixed to the main support leg; the connecting beam is fixed to a plurality of pillars arranged at intervals along the transverse direction; each of the temporary support legs also includes a temporary connecting beam group located at the upper, middle and lower parts of the temporary support leg, and the temporary connecting beam group is detachably fixed to the corresponding end of the arc-shaped beam, the end of the connecting beam and the temporary support leg respectively.

[0013] In some embodiments, the sling includes a basket bolt assembly, a balance frame beam and a lifting rope assembly, the lower end of the basket bolt assembly is detachably connected to the main body fixing frame, the upper end of the basket bolt assembly is connected to the balance frame beam, one end of the lifting rope assembly is connected to the balance frame beam, and the other end of the lifting rope assembly is used to be connected to a crane.

[0014] In some embodiments, the main body fixing frame is provided with a plurality of main lifting ears on the horizontal frame located at the top thereof, and correspondingly, a plurality of lower lifting ears are provided at the lower part of the balance frame beam, and the basket bolt assembly includes a plurality of basket bolts, and the plurality of basket bolts are connected one-to-one between the plurality of main lifting ears and the plurality of lower lifting ears.

[0015] In some embodiments, a plurality of upper lifting ears are provided on the upper portion of the balancing frame beam; accordingly, the lifting rope assembly includes a plurality of lifting ropes, one end of each of the lifting ropes is connected to the plurality of upper lifting ears through a third pin shaft, and the other end of each of the lifting ropes is provided with a locking buckle.

[0016] According to an embodiment of the present invention, a method for hoisting a cold screen of a side ring body at the bottom of a dewar includes the aforementioned hoisting tool, and the hoisting method includes: connecting the cold screen to the hoisting frame, and making the adjacent ends of two adjacent cold screens fixedly connected to the main fixing assembly respectively, and making the arc-shaped outward end of the cold screen located at the end fixedly connected to a temporary fixing assembly; connecting one end of the hoist to the top of the main fixing frame, and connecting the other end of the hoist to a crane; and the crane controls the movement of the hoist.

[0017] According to the method for hoisting the cold screen of the side ring body at the bottom of the dewar according to an embodiment of the present invention, a fixed connection between the cold screen and the hoisting frame can be achieved by connecting the cold screen to the hoisting frame, and fixing the adjacent ends of two adjacent cold screens to the main fixing assembly respectively, and fixing the arc-outward end of the cold screen located at the end to the temporary fixing assembly, so as to ensure that the hoisting frame can stably support the cold screen and avoid deformation of the cold screen, thereby ensuring the stability of the cold screen during hoisting; then, the crane is used to control the movement of the hoisting device, so that the cold screen can be hoisted to a specific position for installation and positioning, which is convenient for the assembly of the cold screen.

[0018] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 Schematic diagram of the hoisting environment of the dewar bottom side ring cold shield in some embodiments of the present invention.

[0021] Figure 2 This is a schematic diagram of a cold screen being hoisted by a hoisting tool according to some embodiments of the present invention.

[0022] Figure 3 Schematic diagram of lifting tooling according to some embodiments of the present invention.

[0023] Figure 4 Schematic diagram of a hanging frame according to some embodiments of the present invention.

[0024] Figure 5 for Figure 4 Magnified view of region I in the middle.

[0025] Figure 6 for Figure 4 Magnified view of region II.

[0026] Figure 7 for Figure 4 Magnified view of region III.

[0027] Figure 8 for Figure 4 Magnified view of middle region IV.

[0028] Figure 9 This is a front view of a hanging frame according to some embodiments of the present invention.

[0029] Figure 10 sectional views of the clamping structures according to some embodiments of the present invention.

[0030] Figure 11sectional views of bracket structures according to some embodiments of the present invention.

[0031] Figure 12 Schematic diagram of a sling according to some embodiments of the present invention.

[0032] Figure 13 The present invention is a flowchart of a method for hoisting a cold screen according to some embodiments of the present invention.

[0033] Reference numerals:

[0034] 1000. Lifting tooling;

[0035] 100. Hoisting frame;

[0036] 110. Main body fixing frame;

[0037] 111, main support leg;

[0038] 112. Main fixing assembly;

[0039] 113. Clamping structure;

[0040] 1131, first fixing plate;

[0041] 1132, first pin key; 1133, first pin key groove;

[0042] 1134, clamping block;

[0043] 11341, first vertical board;

[0044] 11342, clamping portion; 113421, clamping connection hole;

[0045] 114. Bracket structure;

[0046] 1141, second fixing plate;

[0047] 1142, second pin key; 1143, second pin key groove;

[0048] 1144, pallet;

[0049] 11441, second vertical board;

[0050] 11442, supporting portion; 11443, reinforcing rib plate;

[0051] 115. Horizontal frame;

[0052] 1151, curved beam; 11511, first connecting plate seat;

[0053] 1152, radial beam;

[0054] 1153, connecting beam; 11531, fifth connecting plate seat;

[0055] 1154, main lifting lug;

[0056] 116. Pillar;

[0057] 120. Temporary fixing frame;

[0058] 121. Temporary outriggers;

[0059] 122. Temporary fixing components;

[0060] 1221, fixed block;

[0061] 12211, third vertical plate; 12212, fourth vertical plate; 122121, temporary fixing hole;

[0062] 123. Temporary connecting beam group;

[0063] 1231, temporary first connecting beam;

[0064] 12311, second connecting plate seat;

[0065] 12312, third connecting plate seat;

[0066] 1232, temporary second connecting beam; 12321, sixth connecting plate seat;

[0067] 124. Fourth connecting plate seat;

[0068] 200, spreader;

[0069] 210, turnbuckle assembly; 211, turnbuckle; 220, balance frame beam; 221, lower lifting lug;

[0070] 222, upper lifting lug; 230, lifting rope assembly; 231, lifting rope;

[0071] 300, first fixing member; 400, third fixing member; 500, first pin;

[0072] 600, second pin; 700, third pin; 800, lock;

[0073] 900, counterweight; 910, anti-collision beam;

[0074] 1100, cold screen;

[0075] 1200. Biological shielding wall; 1300. Gravity support structure; 1400. Dewar base plate. DETAILED DESCRIPTION

[0076] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0077] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] The following describes the hoisting tool 1000 of the Dewar bottom side ring cold shield 1100 according to an embodiment of the present invention with reference to the accompanying drawings.

[0079] Combine Figure 1 and Figure 2 As shown, a hoisting tool 1000 for a Dewar bottom side ring cold shield 1100 according to an embodiment of the present invention includes: a hoisting frame 100 and a hoisting device 200 .

[0080] Among them, combined Figure 2 and Figure 3 As shown, the hoisting frame 100 includes a main fixing frame 110 and two temporary fixing frames 120. The main fixing frame 110 and the two temporary fixing frames 120 cooperate to stably support the cold shield 1100, facilitating the hoisting of the cold shield 1100. At the same time, the main fixing frame 110 and the two temporary fixing frames 120 have a strong load-bearing capacity, so that the hoisting frame 100 is suitable for hoisting cold shields 1100 of different sizes and weights.

[0081] Combine Figure 3 and Figure 4As shown, the main frame 110 includes a plurality of main legs 111 spaced apart along an arc. Each main leg 111 is provided with a main fixing assembly 112, which is used to fix arcuately adjacent cold shields 1100. The provision of the plurality of main legs 111 spaced apart along the arc allows the main frame 110 to conform to the shape of the cold shield 1100, facilitating its support of the cold shield 1100. Furthermore, the force exerted by the cold shield 1100 on the main frame 110 can be distributed across the plurality of main legs 111, thereby preventing local stress concentration on the main frame 110 and ensuring the stability of the main frame 110, thereby ensuring the relative stability between the cold shield 1100 and the main frame 110.

[0082] At the same time, by providing a main fixing component 112 for fixing the arc-shaped adjacent cold screens 1100 on each main support leg 111, on the first hand, the cold screen 1100 can be stably connected to the main support leg 111, reducing the difficulty of connecting the main support leg 111 and the cold screen 1100, and at the same time, the main fixing component 112 enhances the strength of the connection between the main support leg 111 and the cold screen 1100 to a certain extent, ensuring the stability of the cold screen 1100 during the hoisting project, avoiding deformation of the cold screen 1100, and also avoiding tilting or displacement of the cold screen 1100, thereby ensuring the installation accuracy of the cold screen 1100; on the second hand, it can realize the fixed connection of two adjacent cold screens 1100, so that the relative position of the two adjacent cold screens 1100 is stable, further improving the stability of the cold screen 1100 during the hoisting project; on the third hand, it can also enable two adjacent cold screens 1100 to share one main fixing component 112 for fixation, which is conducive to simplifying the structure of the main fixing frame 110.

[0083] Combine Figure 3 and Figure 4 As shown, two temporary fixing frames 120 are detachably fixed to the arcuate ends of the main fixing frame 110. The temporary fixing frames 120 include temporary legs 121, which are spaced apart from the main legs 111 along the arc. Each temporary leg 121 is equipped with a temporary fixing assembly 122, which is used to fix the arcuate outer ends of the cold shield 1100 located at the ends. This allows the cold shield 1100 located at the ends to be fixed, improves the positional stability of the cold shield 1100 at the ends, ensures that the cold shield 1100 remains level during the hoisting process, prevents deformation of the cold shield 1100, and improves the installation accuracy of the cold shield 1100.

[0084] It is worth noting that the temporary fixing frame 120 is detachably fixed to the main fixing frame 110 , so that the temporary fixing frame 120 can be removed when the cold shield 1100 is subsequently adjusted in the foundation pit to avoid affecting the adjustment of the cold shield 1100 .

[0085] At the same time, each temporary support leg 121 is provided with a temporary fixing component 122 for fixing the arc-outward end of the corresponding end cold screen 1100. The temporary fixing component 122 can reduce the difficulty of connecting the temporary support leg 121 and the cold screen 1100, and to a certain extent enhance the connection strength between the temporary support leg 121 and the cold screen 1100, thereby ensuring the stability of the cold screen 1100 during the lifting project.

[0086] like Figure 3 As shown, one end of the sling 200 is connected to the top of the main body fixing frame 110, and the other end of the sling 200 is used to connect to a crane (not shown). This allows the crane to lift the sling 200 and hoist the cold shield 1100, thereby installing and positioning the cold shield 1100 in a specific location, reducing the difficulty of hoisting the cold shield 1100.

[0087] As can be seen from the above structure, the hoisting tool 1000 of the Dewar bottom side ring cold shield 1100 of the embodiment of the present invention is provided with a main fixing frame 110 and two temporary fixing frames 120. The main fixing frame 110 and the two temporary fixing frames 120 cooperate to stably support the cold shield 1100, so that the hoisting frame 100 can be suitable for hoisting cold shields 1100 of different sizes and different weights.

[0088] In addition, each temporary support leg 121 is provided with a temporary fixing component 122 for fixing the arc-shaped outward end of the cold screen 1100 at the end. The temporary fixing component 122 can reduce the difficulty of connecting the temporary support leg 121 and the cold screen 1100, and to a certain extent enhance the connection strength between the temporary support leg 121 and the cold screen 1100, thereby ensuring the stability of the cold screen 1100 during the lifting project.

[0089] At the same time, the detachable temporary fixing frame 120 also facilitates the subsequent adjustment of the cold shield 1100 in the foundation pit, so that the temporary fixing frame 120 can be removed to avoid affecting the adjustment of the cold shield 1100.

[0090] It can be understood that compared with the existing technology, the lifting tool 1000 of the present application is not only suitable for the lifting of cold screens 1100 of different sizes and weights, but also can ensure the stability of the cold screen 1100 during the lifting project, avoid deformation of the cold screen 1100, and also avoid tilting or displacement of the cold screen 1100, thereby improving the installation accuracy of the cold screen 1100 and ensuring the working performance of the cold screen 1100.

[0091] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0092] In some embodiments, combined Figure 4 、 Figure 5 and Figure 10As shown, on each main support leg 111, the main fixing assembly 112 includes a clamping structure 113, which is respectively located at the upper, middle and lower parts of the main support leg 111, and the clamping structure 113 includes a first fixing plate 1131, a first pin key 1132 and a clamping block 1134. The first fixing plate 1131 is fixed on the main support leg 111, and the clamping block 1134 is detachably fixed on the first fixing plate 1131. The clamping block 1134 is used to fix two arc-adjacent cold screens 1100. The first pin key 1132 is arranged between the first fixing plate 1131 and the clamping block 1134 to limit the horizontal movement of the clamping block 1134. Among them, by respectively arranging the clamping structure 113 at the upper, middle and lower parts of the main support leg 111, the clamping structure 113 can correspond to the upper, middle and lower structures of the cold screen 1100, so as to facilitate the use of the clamping structure 113 to clamp and fix the upper, middle and lower parts of the cold screen 1100, thereby ensuring the stability of the connection between the clamping structure 113 and the cold screen 1100, thereby improving the stability of the cold screen 1100 and facilitating the subsequent lifting work of the cold screen 1100.

[0093] At the same time, by fixing the first fixed plate 1131 on the main support leg 111, the clamping block 1134 can be detachably fixed on the first fixed plate 1131, which can reduce the difficulty of disassembling the clamping block 1134 and the first fixed plate 1131, making it easier to remove the lifting tooling 1000 after the cold screen 1100 is lifted into place.

[0094] In addition, by arranging the first pin key 1132 between the first fixing plate 1131 and the clamping block 1134, the connection between the first fixing plate 1131 and the clamping block 1134 is made more stable, thus preventing the clamping block 1134 from being displaced. In this way, no displacement will occur between the cold screen 1100 and the main fixing frame 110, thereby preventing the cold screen 1100 from being deformed, thereby improving the installation accuracy of the cold screen 1100.

[0095] In some embodiments, the cold shield 1100 is provided with connecting flanges, and two adjacent connecting flanges are arranged opposite to each other and are simultaneously provided on the clamping block 1134 , so as to achieve the use of the clamping block 1134 to fix the two arc-shaped adjacent cold shields 1100 .

[0096] In some embodiments, the first fixing plate 1131 is fixedly connected to the main leg 111 by welding to ensure the stability of the connection between the first fixing plate 1131 and the main leg 111.

[0097] In some embodiments, combined Figure 5 and Figure 10As shown, both the first fixing plate 1131 and the clamping block 1134 are provided with vertically extending first pin key slots 1133, into which the first pin key 1132 is embedded. This restricts the horizontal movement of the clamping block 1134, and the first pin key slots 1133 reduce the difficulty of assembling the first pin key 1132 between the first fixing plate 1131 and the clamping block 1134.

[0098] In some embodiments, combined Figure 5 and Figure 10 As shown, the clamping block 1134 includes a first vertical plate 11341 and two clamping parts 11342. The first vertical plate 11341 and the first fixed plate 1131 are detachably fixed by the first fixing member 300. The two clamping parts 11342 are vertically arranged and fixed on the first vertical plate 11341 horizontally opposite to each other. The two clamping parts 11342 are both provided with clamping connection holes 113421. The connecting flanges of the two adjacent cold screens 1100 are provided between the two clamping parts 11342 and are fixed through the clamping connection holes 113421, so as to realize the use of the clamping block 1134 to fix the two arc-shaped adjacent cold screens 1100.

[0099] The first fixing member 300 can reduce the difficulty of connecting the first vertical plate 11341 and the first fixing plate 1131 , thereby ensuring the connection stability between the first vertical plate 11341 and the first fixing plate 1131 .

[0100] In some embodiments, the first fixing member 300 is a bolt or a screw.

[0101] It should be noted that after the structural clamping of two adjacent cold screens 1100 is restricted between the two clamping parts 11342, by inserting the second fixing part into the clamping connection hole 113421 and stopping the cold screen 1100, the cold screen 1100 can be prevented from tilting or displacing during hoisting, thereby ensuring that the cold screen 1100 does not shift or deform during the hoisting process.

[0102] It should also be noted that the second fixing member mentioned above can be a bolt or a screw.

[0103] In some embodiments, the clamping block 1134 is an integrally formed part, which enhances the structural strength of the clamping block 1134 to a certain extent and ensures the working performance of the clamping block 1134.

[0104] In some embodiments, combined Figure 4 、 Figure 6 and Figure 11As shown, the main fixing assembly 112 also includes a bracket structure 114, which is located below the clamping structure 113 at the bottom of the main leg 111. The bracket structure 114 includes a second fixing plate 1141, a second pin key 1142, and a support plate 1144. The second fixing plate 1141 is fixed to the main leg 111, and the support plate 1144 is detachably fixed to the second fixing plate 1141. The support plate 1144 is used to support two adjacent cold shields 1100 in an arc shape. The second pin key 1142 is disposed between the second fixing plate 1141 and the support plate 1144 to limit the horizontal movement of the support plate 1144. The bracket structure 114 is provided below the clamping structure 113 at the bottom of the main leg 111, so that the bracket structure 114 supports the bottom of the cold shield 1100, preventing the cold shield 1100 from shaking or displacement during hoisting, thereby ensuring the stability and installation accuracy of the cold shield 1100 during hoisting.

[0105] At the same time, by fixing the second fixing plate 1141 on the main support leg 111, the support plate 1144 can be detachably fixed on the second fixing plate 1141, which can reduce the difficulty of disassembling and assembling the support plate 1144 and the second fixing plate 1141, making it easier to remove the lifting tooling 1000 after the cold screen 1100 is lifted into place.

[0106] In addition, by arranging the second pin key 1142 between the second fixing plate 1141 and the support plate 1144, the connection between the second fixing plate 1141 and the support plate 1144 is made more secure, thus preventing the support plate 1144 from being displaced. In this way, the cold screen 1100 and the main fixing frame 110 will not be displaced, thereby preventing the cold screen 1100 from being deformed, thereby improving the installation accuracy of the cold screen 1100.

[0107] In some embodiments, the second fixing plate 1141 is welded and fixed to the main leg 111 to ensure the stability of the connection between the second fixing plate 1141 and the main leg 111.

[0108] In some embodiments, combined Figure 6 and Figure 11 As shown, the second fixing plate 1141 and the supporting plate 1144 are both provided with a second pin key slot 1143 extending vertically, and the second pin key 1142 is embedded in the second pin key slot 1143 of the second fixing plate 1141 and the supporting plate 1144. This restricts the horizontal movement of the supporting plate 1144, and the second pin key slot 1143 reduces the difficulty of assembling the second pin key 1142 between the second fixing plate 1141 and the supporting plate 1144.

[0109] In some embodiments, combined Figure 6 and Figure 11As shown, the support plate 1144 includes a second vertical plate 11441 and a supporting portion 11442. The second vertical plate 11441 and the second fixed plate 1141 are detachably fixed using a third fixing member 400, and the supporting portion 11442 is fixed to the second vertical plate 11441. The third fixing member 400 can reduce the difficulty of connecting the second vertical plate 11441 and the second fixed plate 1141, ensuring the stability of the connection between the second vertical plate 11441 and the second fixed plate 1141. At the same time, the supporting portion 11442 is provided to stably support the bottom of the cold shield 1100, thereby ensuring the stability of the cold shield 1100.

[0110] In some embodiments, the third fixing member 400 is a bolt or a screw.

[0111] In some embodiments, combined Figure 6 and Figure 11 As shown, the support plate 1144 also includes a reinforcing rib 11443, which is located below the supporting portion 11442 and is fixedly connected to the supporting portion 11442 and the second vertical plate 11441. The reinforcing rib 11443 can improve the structural strength of the support plate 11444, so that the supporting portion 11442 can more stably support the cold shield 1100.

[0112] In some embodiments, the support plate 1144 is an integrally formed part, which enhances the structural strength of the support plate 1144 to a certain extent and ensures the working performance of the support plate 1144.

[0113] It is worth noting that during the hoisting process of the cold screen 1100, the cold screen 1100 can be first placed on the bracket structure 114, and the bracket structure 114 stably supports the bottom of the cold screen 1100, while clamping and fixing the partial structures of the two adjacent cold screens 1100 in the same clamping structure 113, thereby achieving a stable connection between the cold screen 1100 and the main fixing frame 110.

[0114] In some embodiments, combined Figure 3 、 Figure 4 and Figure 7 As shown, on each temporary support leg 121, a temporary fixing assembly 122 includes fixing blocks 1221 located at the top, middle, and bottom of the temporary support leg 121. The fixing blocks 1221 are used to fix to the arc-shaped outward ends of the cold shield 1100 at the end. This ensures that the cold shield 1100 at the end can also be fixed during the hoisting process, improving the positional stability of the cold shield 1100 at the end, ensuring that the cold shield 1100 remains level during the hoisting process, preventing deformation of the cold shield 1100, and improving the installation accuracy of the cold shield 1100.

[0115] At the same time, the fixing block 1221 can reduce the difficulty of connecting the temporary support legs 121 and the cold shield 1100, and enhance the connection strength between the temporary support legs 121 and the cold shield 1100 to a certain extent, thereby ensuring the stability of the cold shield 1100 during the lifting project.

[0116] In some embodiments, combined Figure 4 and Figure 7 As shown, the fixing block 1221 includes a third riser 12211 and a fourth riser 12212 connected in an L-shape. The third riser 12211 is fixed to the temporary leg 121, and the fourth riser 12212 is provided with a temporary fixing hole 122121. The arc-shaped outward end of the cold shield 1100 is fixed to the fourth riser 12212 through the temporary fixing hole 122121. This allows the fixing block 1221 to secure the cold shield 1100 at the end.

[0117] Among them, the third vertical plate 12211 reduces the connection difficulty between the fixing block 1221 and the temporary support leg 121, and the temporary fixing hole 122121 can reduce the connection difficulty between the fourth vertical plate 12212 and the cold shield 1100, thereby reducing the fixing difficulty of the fixing block 1221 and the cold shield 1100.

[0118] In summary, the hoisting tool 1000 of the present application not only stably connects the cold shield 1100 and the main fixing frame 110 , but also uses the temporary fixing frame 120 to fix the cold shield 1100 at the end, thereby ensuring the position stability of the cold shield 1100 .

[0119] In some embodiments, the third vertical plate 12211 and the temporary leg 121 can be fixed by welding.

[0120] In some embodiments, as Figure 9 As shown, the lifting fixture 1000 also includes a plurality of counterweights 900. The counterweights 900 are used to adjust the center of gravity of the lifting fixture 1000, thereby maintaining a good balance of the cold shield 1100 and preventing vibration, sealing failure, or mechanical stress concentration of the cold shield 1100 due to a shift in the center of gravity.

[0121] It should be noted that the counterweight block 900 offsets the mass eccentricity of other components of the cold shield 1100 (such as refrigerators, pipelines, detectors, etc.) by increasing the mass at a specific position, so that the center of mass of the entire cold shield system falls on the designed central axis.

[0122] In some embodiments, combined Figure 4 and Figure 9 As shown, the main body fixing frame 110 includes horizontal frames 115 located at the upper, middle and lower parts. The multiple horizontal frames 115 cooperate to improve the structural stability of the main body fixing frame 110.

[0123] In some embodiments, combined Figure 4 and Figure 9 As shown, the horizontal frame 115 located at the lower part of the main body fixed frame 110 is used to place the counterweight block 900 to facilitate adjustment of the center of gravity of the lifting tool 1000 during the lifting process; the horizontal frame 115 located in the middle of the main body fixed frame 110 can strengthen the strength of the main body fixed frame 110 and ensure the structural stability of the main body fixed frame 110. The horizontal frame 115 located at the upper part of the main body fixed frame 110 is used to connect with the sling 200 to facilitate the crane transportation and installation of the cold screen 1100.

[0124] In some embodiments, combined Figure 4 and Figure 9 As shown, the main body fixing frame 110 further includes pillars 116 . The pillars 116 and the main legs 111 are arranged opposite to each other and are respectively connected to the horizontal frames 115 , so as to form a structurally stable main body fixing frame 110 .

[0125] In a specific example, combined with Figure 4 and Figure 9 As shown, the horizontal frame 115 can be divided into three layers on the main body fixing frame 110 : an upper horizontal frame 115 , a middle horizontal frame 115 and a lower horizontal frame 115 .

[0126] In some embodiments, combined Figure 4 and Figure 9 As shown, each horizontal frame 115 includes a curved beam 1151, a radial beam 1152, and a connecting beam 1153. The connecting beam 1153 is located inside the curved beam 1151. One end of the radial beam 1152 is fixedly connected to the curved beam 1151, and the other end of the radial beam 1152 is fixedly connected to the connecting beam 1153. The curved beam 1151 is fixed to the main support leg 111, and the connecting beam 1153 is fixed to a plurality of struts 116 arranged at intervals along the transverse direction. This forms a structurally stable main frame 110.

[0127] In some embodiments, the horizontal frame 115 , the main legs 111 and the pillars 116 are all made of square steel. By welding the horizontal frame 115 , the main legs 111 and the pillars 116 together to form the main fixing frame 110 , the structural strength of the main fixing frame 110 can be increased to a certain extent.

[0128] In some embodiments, combined Figure 4 and Figure 8As shown, each temporary support leg 121 further includes a temporary connecting beam group 123 located at the upper, middle, and lower portions of the temporary support leg 121. The temporary connecting beam group 123 is detachably fixed to the ends of the corresponding curved beam 1151, the ends of the connecting cross beam 1153, and the temporary support leg 121. While achieving detachable fixation of the two temporary fixing frames 120 to the arcuate ends of the main fixing frame 110, the connection strength between the temporary fixing frames 120 and the main fixing frame 110 is improved, and the disassembly and assembly of the temporary support legs 121 and the main fixing frame 110 is facilitated, thereby reducing the difficulty of disassembly of the temporary support legs 121 and the main fixing frame 110.

[0129] In some embodiments, combined Figure 4 and Figure 8 As shown, the temporary connecting beam group 123 includes a temporary first connecting beam 1231 and a temporary second connecting beam 1232. The temporary first connecting beam 1231 is detachably fixed between the end of the curved beam 1151 and the temporary leg 121, and the temporary second connecting beam 1232 is detachably fixed between the end of the connecting crossbeam 1153 and the temporary leg 121. The temporary first connecting beam 1231 can reduce the difficulty of disassembly between the end of the curved beam 1151 and the temporary leg 121, and the temporary second connecting beam 1232 can reduce the difficulty of disassembly between the end of the connecting crossbeam 1153 and the temporary leg 121, thereby achieving detachable fixation of the temporary connecting beam group 123 to the corresponding end of the curved beam 1151, the end of the connecting crossbeam 1153, and the temporary leg 121, respectively.

[0130] In some embodiments, combined Figure 4 and Figure 8 As shown, for each temporary connecting beam group 123, a first connecting plate seat 11511 is fixed to the end of the curved beam 1151, and a second connecting plate seat 12311 is provided at one end of the temporary first connecting beam 1231. The first connecting plate seat 11511 and the second connecting plate seat 12311 are fixed together by bolts. This allows the temporary first connecting beam 1231 to be detachably fixed to the end of the curved beam 1151, thereby facilitating the removal of the temporary first connecting beam 1231 and reducing the difficulty of disassembling and assembling the temporary first connecting beam 1231 and the curved beam 1151.

[0131] In some embodiments, combined Figure 4 and Figure 8 As shown, a fifth connecting plate seat 11531 is fixed to the end of the connecting crossbeam 1153, and a sixth connecting plate seat 12321 is provided at one end of the temporary second connecting beam 1232. The fifth connecting plate seat 11531 and the sixth connecting plate seat 12321 are fixed together by bolts. To facilitate disassembly, the temporary second connecting beam 1232 is detachably fixed to the end of the connecting crossbeam 1153.

[0132] In some embodiments, combined Figure 4 and Figure 8 As shown, the other ends of the temporary first connecting beam 1231 and the temporary second connecting beam 1232 are simultaneously connected to the third connecting plate seat 12312. The temporary supporting leg 121 is provided with a fourth connecting plate seat 124. The third connecting plate seat 12312 and the fourth connecting plate seat 124 are connected by bolts. This facilitates the detachable fixing of the temporary first connecting beam 1231 and the temporary second connecting beam 1232 to the temporary supporting leg 121.

[0133] Through the above arrangement, the temporary legs 121 and the main body fixing frame 110 are finally disassembled and fixed.

[0134] In the description of the present invention, features defined as "first", "second", "third", "fourth", "fifth" and "sixth" may explicitly or implicitly include one or more of such features, which are used to distinguish and describe the features, without any distinction in order or importance.

[0135] In some embodiments, combined Figure 2 and Figure 3 As shown, the hoisting tool 1000 further includes an anti-collision beam 910, which is provided on the main body fixing frame 110. The anti-collision beam 910 can prevent the main body fixing frame 110 from colliding with other components during the hoisting process, thereby ensuring the stability of the cold screen 1100 during hoisting.

[0136] In some embodiments, combined Figure 3 、 Figure 4 and Figure 12 As shown, the hoist 200 includes a turnbuckle assembly 210, a balance frame beam 220, and a hoisting rope assembly 230. The lower end of the turnbuckle assembly 210 is detachably connected to the main body fixing frame 110, and the upper end of the turnbuckle assembly 210 is connected to the balance frame beam 220. One end of the hoisting rope assembly 230 is connected to the balance frame beam 220, and the other end of the hoisting rope assembly 230 is used to connect to a crane. This facilitates the use of a crane to lift the hoisting frame 100 and to lift the cold shield 1100. This allows the cold shield 1100 to be installed and positioned in a specific location, reducing the difficulty of lifting the cold shield 1100.

[0137] Among them, by setting the basket bolt assembly 210, the basket bolt assembly 210 can be used to adjust the position and posture of the cold screen 1100 during hoisting; by setting the balance frame beam 220, the hoisting strength of the sling 200 can be guaranteed to a certain extent; by setting the lifting rope assembly 230, the position of the sling 200 can be adjusted by adjusting the length of the lifting rope assembly 230, thereby adjusting the position of the cold screen 1100, ensuring that the cold screen 1100 remains level during the hoisting process, thereby ensuring the installation accuracy of the cold screen 1100.

[0138] In some embodiments, the balance frame beam 220 is made of I-shaped steel by welding, so that the balance frame beam 220 has a simple structure and high strength, which can meet the requirements of hoisting the cold screen 1100.

[0139] In some embodiments, combined Figure 3 、 Figure 4 、 Figure 9 and Figure 12 As shown, the main frame 110 is provided with a plurality of main lifting lugs 1154 on the horizontal frame 115 at the top thereof. Accordingly, the lower portion of the balancing frame beam 220 is provided with a plurality of lower lifting lugs 221. The turnbuckle assembly 210 includes a plurality of turnbuckles 211, which are connected one-to-one between the plurality of main lifting lugs 1154 and the plurality of lower lifting lugs 221. The lower end of the turnbuckle assembly 210 is detachably connected to the main frame 110, while the upper end of the turnbuckle assembly 210 is connected to the balancing frame beam 220. This allows the plurality of turnbuckles 211 to be connected one-to-one between the main frame 110 and the balancing frame beam 220, facilitating the lifting of the cold shield 1100 and the main frame 110 through the coordinated use of the balancing frame beam 220 and the plurality of turnbuckles 211.

[0140] It should be noted that the basket bolt 211 is usually composed of a screw with threads at both ends and a nut (basket body) in the middle. By rotating the nut, the screws at both ends will move inward or outward synchronously, changing the overall length of the basket bolt 211, thereby realizing the adjustment of the position and posture of the cold screen 1100.

[0141] In a specific example, combining Figure 4 and Figure 9 As shown, there are four main lifting lugs 1154, two of which are symmetrically distributed on the curved beam 1151, and the other two are symmetrically distributed on the connecting crossbeam 1153. The line connecting the four main lifting lugs 1154 forms an isosceles trapezoid. During the hoisting process of the cold shield 1100, the weight of the cold shield 1100 is evenly transferred to the hoisting device 200 through the four main lifting lugs 1154, ensuring the stability of the cold shield 1100 during hoisting to a certain extent.

[0142] In some examples, accordingly, Figure 12 As shown, the balancing frame beam 220 is in an isosceles trapezoidal shape and has four lower lifting lugs 221, which are distributed at the four corners of the balancing frame beam 220. This allows the four lower lifting lugs 221 of the balancing frame beam 220 to evenly and dispersely transfer the weight borne by the four main lifting lugs 1154 to the balancing frame beam 220, thereby ensuring that the cold shield 1100 remains balanced during the hoisting process.

[0143] In some embodiments, as Figure 12As shown, there are four turnbuckles 211. The lower ends of the four turnbuckles 211 are movably connected to the four main lifting ears 1154, and the upper ends of the four turnbuckles 211 are movably connected to the four lower lifting ears 221. This allows for easy adjustment of the overall length of the turnbuckles 211, thereby adjusting the position and posture of the cold shield 1100.

[0144] In some embodiments, as Figure 12 As shown, the lower ends of the four turnbuckles 211 are respectively connected to the four main lifting ears 1154 via the first pins 500, and the upper ends of the four turnbuckles 211 are respectively movably connected to the four lower lifting ears 221 via the second pins 600. The lower ends of the four turnbuckles 211 are respectively connected to the four main lifting ears 1154 via the first pins 500, allowing the four turnbuckles 211 to rotate relative to the four main lifting ears 1154, thereby achieving movable connection between the four turnbuckles 211 and the four lower lifting ears 221, and reducing the difficulty of connecting the four turnbuckles 211 to the four lower lifting ears 221.

[0145] At the same time, by setting the upper ends of the four basket bolts 211 to be movably connected to the four lower hanging ears 221 through the second pin shaft 600 respectively, the four basket bolts 211 can rotate relative to the four lower hanging ears 221, thereby realizing the coordinated connection between the four basket bolts 211 and the balance frame beam 220 and reducing the difficulty of connecting the four basket bolts 211 and the balance frame beam 220.

[0146] The second pin shaft 600 can also improve the convenience of disassembling and assembling the turnbuckle bolt 211 and the lower lifting ear 221 to a certain extent.

[0147] In some embodiments, as Figure 12 As shown, the upper portion of the balancing frame beam 220 is provided with a plurality of upper lifting ears 222. Correspondingly, the suspension rope assembly 230 includes a plurality of suspension ropes 231. One end of each of the suspension ropes 231 is connected to the plurality of upper lifting ears 222 via a third pin 700, thereby achieving a coordinated connection between the balancing frame beam 220 and the suspension ropes 231.

[0148] At the same time, the hanging rope assembly 230 includes a plurality of hanging ropes 231 , and the position of the cold screen 1100 during hanging can be adjusted by adjusting the lengths of the plurality of hanging ropes 231 .

[0149] In addition, by providing the third pin 700 , the difficulty of connecting the lifting rope 231 and the upper lifting ear 222 can be reduced, and the convenience of assembling and disassembling the lifting rope 231 and the upper lifting ear 222 can be improved to a certain extent.

[0150] In some embodiments, as Figure 12As shown, the other ends of the plurality of lifting ropes 231 are respectively provided with lock buckles 800. This is to facilitate locking and connecting the lifting device 200 to the crane, so as to facilitate the crane to lift and transport the cold screen 1100.

[0151] In a specific example, Figure 12 As shown, there are four upper lifting lugs 222 arranged in a rectangular shape. This allows the four upper lifting lugs 222 to disperse the weight of the cold shield 1100 exerted on the balance frame beam 220 to the lifting rope 231, while also ensuring the balance of the balance frame beam 220 and the balance and stability of the cold shield 1100 during installation.

[0152] The following describes a method for hoisting the Dewar bottom side ring cold shield 1100 according to an embodiment of the present invention with reference to the accompanying drawings.

[0153] like Figure 13 As shown, the hoisting method of the Dewar bottom side ring cold shield 1100 according to an embodiment of the present invention includes the aforementioned hoisting tool 1000, and the hoisting method includes:

[0154] S1. Connect the cold shield 1100 to the hanging frame 100, and fix the adjacent ends of two adjacent cold shields 1100 to the main fixing assembly 112 respectively, and fix the arc-shaped outward end of the cold shield 1100 located at the end to the temporary fixing assembly 122.

[0155] In this step, the cold shield 1100 and the hoisting frame 100 can be fixedly connected to ensure that the hoisting frame 100 can stably support the cold shield 1100 and prevent the cold shield 1100 from deformation, thereby ensuring the stability of the cold shield 1100 during hoisting.

[0156] S2. Connect one end of the sling 200 to the top of the main body fixing frame 110, and connect the other end of the sling 200 to the crane.

[0157] S3. The crane controls the lifting device 200 to move.

[0158] In this step, since the crane controls the movement of the hoist 200 , the movement of the cold shield 1100 can be further controlled, making it easier to hoist the cold shield 1100 to a specific location for installation and positioning, thereby facilitating the assembly of the cold shield 1100 .

[0159] As can be seen from the above structure, the hoisting method of the Dewar bottom side ring cold shield 1100 in the embodiment of the present invention is not only applicable to the hoisting of cold shields 1100 of different sizes and weights, but also ensures the stability and installation accuracy of the cold shield 1100 during the hoisting process.

[0160] In some embodiments, the hoisting method further includes adjusting the position of the counterweight 900 in the hoisting frame 100 , the turnbuckle 211 , and the hoisting rope 231 to adjust the center of gravity and position of the cold shield 1100 .

[0161] In this step, the center of gravity of the hoisting frame 100 can be changed by adjusting the position of the counterweight block 900 of the hoisting frame 100, and the position and posture of the cold screen 1100 can be adjusted by adjusting the length of the basket bolt 211 and the hoisting rope 231. Through the above adjustments, the balance of the cold screen 1100 during hoisting can be ensured, and the installation accuracy of the cold screen 1100 can be ensured.

[0162] It should be noted that in the specific example, Figure 1 As shown, the hoisting environment of the cold shield 1100 on the side ring of the bottom of the Dewar includes a biological shielding wall 1200, a gravity support structure 1300, a bottom plate of the Dewar base 1400, a cold shield 1100 and a hoisting tool 1000, wherein the cold shield 1100 matches the position of the 16 neck tubes at the bottom, and the gravity support structure 1300 has been installed in place. Due to the limited installation space in the Dewar base, the cold shield 1100 cannot collide with the gravity support structure 1300 and other components during hoisting, and cannot contaminate the Dewar base. Therefore, the hoisting tool 1000 and the hoisting method of the cold shield 1100 must meet the precision requirements, and also need to meet the requirements that the cold shield 1100 is easy to install and disassemble and the adjustment method is simple.

[0163] In summary, the present application sets up a lifting tool 1000. By setting up a main fixing frame 110 and two temporary fixing frames 120, the main fixing frame 110 and the two temporary fixing frames 120 can stably support the cold screen 1100, so that the lifting frame 100 can be suitable for lifting cold screens 1100 of different sizes and different weights, ensuring that the position of the cold screen 1100 can be adjusted according to the on-site measurement data during the lifting process of the cold screen 1100, ensuring that the cold screen 1100 is lifted in place, and meeting the requirement of lifting the cold screen 1100 in a specific position.

[0164] Specifically, by setting up a clamping structure 113 and a bracket structure 114, the cold screen 1100 can be fixed to the lifting frame 100, and then according to the on-site measurement data, by adjusting the position of the counterweight block 900 of the lifting frame 100, the basket bolt 211 of the sling 200 and the lifting rope 231 of the lifting rope assembly 230, the center of gravity and position posture of the cold screen 1100 can be adjusted to ensure that the cold screen 1100 is lifted into place.

[0165] In summary, this application sets up a lifting tool 1000 and a lifting method to meet the requirements of large size, heavy weight, high installation precision, narrow adjustment space, no tilting and controlled deformation during lifting, so as to be suitable for the lifting of cold screens 1100 of different sizes and weights, meet the installation requirements of narrow lifting space, and ensure the adjustment of the center of gravity and position posture of the cold screen 1100 to avoid deformation of the cold screen 1100 and ensure that the cold screen 1100 does not tilt during the lifting process, thereby ensuring the stability of the cold screen 1100 during the lifting process.

[0166] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0167] Figure 9 Four counterweights 900 are shown for illustrative purposes, but after reading the above technical solution, ordinary technicians can obviously understand that the solution can be applied to the technical solution of one, two, three or more counterweights 900, which also falls within the scope of protection of the present invention.

[0168] The specific structure of the hoisting fixture 1000 and the hoisting method of the Dewar bottom side ring cold shield 1100 according to the embodiment of the present invention, such as the counterweight block 900, is well known to those skilled in the art and will not be described in detail here.

[0169] Throughout this specification, reference to terms such as "embodiment" or "example" indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0170] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A hoisting tool for the cold shield of the side ring body at the bottom of the dewar, characterized in that: include: A hanging frame (100), the hanging frame (100) comprising a main fixing frame (110) and two temporary fixing frames (120); the main fixing frame (110) comprising a plurality of main legs (111) spaced apart along an arc direction, each of the main legs (111) being provided with a main fixing assembly (112), the main fixing assembly (112) being used to fix two arc-adjacent cold screens; the two temporary fixing frames (120) being detachably fixed to the arc-direction ends of the main fixing frame (110), the temporary fixing frames (120) comprising temporary legs (121), the temporary legs (121) being spaced apart from the main legs (111) along an arc direction, each of the temporary legs (121) being provided with a temporary fixing assembly (122), the temporary fixing assembly (122) being used to fix the arc-direction outer ends of the cold screens located at the ends; A sling (200), one end of the sling (200) is connected to the top of the main body fixing frame (110), and the other end of the sling (200) is used to be connected to a crane.

2. The hoisting tool for the Dewar bottom side ring cold shield according to claim 1 is characterized in that: On each of the main legs (111), the main fixing assembly (112) includes a clamping structure (113) located at the upper, middle and lower parts of the main legs (111), respectively. The clamping structure (113) includes a first fixing plate (1131), a first pin key (1132) and a clamping block (1134). The first fixing plate (1131) is fixed to the main legs (111). The clamping block (1134) is detachably fixed to the first fixing plate (1131). The clamping block (1134) is used to fix two arc-shaped adjacent cold screens. The first pin key (1132) is arranged between the first fixing plate (1131) and the clamping block (1134) to limit the horizontal movement of the clamping block (1134).

3. The hoisting tool for the Dewar bottom side ring cold shield according to claim 2 is characterized in that: The main fixing assembly (112) further includes a bracket structure (114) located below the clamping structure (113) at the lower part of the main support leg (111), the bracket structure (114) including a second fixing plate (1141), a second pin key (1142) and a support plate (1144), the second fixing plate (1141) being fixed on the main support leg (111), the support plate (1144) being detachably fixed on the second fixing plate (1141), the support plate (1144) being used to support two arc-shaped adjacent cold screens, the second pin key (1142) being arranged between the second fixing plate (1141) and the support plate (1144) to limit horizontal movement of the support plate (1144).

4. The hoisting tool for the Dewar bottom side ring cold shield according to claim 1, characterized in that: On each of the temporary legs (121), the temporary fixing assembly (122) comprises fixing blocks (1221) respectively located at the upper, middle and lower parts of the temporary legs (121), and the fixing blocks (1221) are used to fix to the arc-shaped outer ends of the cold screen at the ends.

5. The hoisting tool for the Dewar bottom side ring cold shield according to claim 4, characterized in that: The fixing block (1221) comprises a third vertical plate (12211) and a fourth vertical plate (12212) connected in an L-shape, the third vertical plate (12211) being fixed to the temporary support leg (121), and a temporary fixing hole (122121) being provided on the fourth vertical plate (12212), and the arc-shaped outward end of the cold screen is fixed to the fourth vertical plate (12212) through the temporary fixing hole (122121).

6. The hoisting tool for the Dewar bottom side ring cold shield according to claim 1, characterized in that: The main body fixing frame (110) includes horizontal frames (115) located at the upper, middle and lower parts; each horizontal frame (115) includes an arc-shaped beam (1151), a radial beam (1152) and a connecting beam (1153), wherein the connecting beam (1153) is located on the inner side of the arc-shaped beam (1151), one end of the radial beam (1152) is fixedly connected to the arc-shaped beam (1151), and the other end of the radial beam (1152) is fixedly connected to the connecting beam (1153); the arc-shaped beam (1151) is fixed to the main support leg (111); and the connecting beam (1153) is fixed to a plurality of pillars (116) arranged at intervals along the transverse direction; Each of the temporary supporting legs (121) further comprises a temporary connecting beam group (123) located at the upper, middle and lower parts of the temporary supporting leg (121), and the temporary connecting beam group (123) is detachably fixed to the end of the corresponding curved beam (1151), the end of the connecting cross beam (1153) and the temporary supporting leg (121).

7. The hoisting tool for the Dewar bottom side ring cold shield according to claim 6, characterized in that: The sling (200) comprises a turnbuckle bolt assembly (210), a balance frame beam (220) and a lifting rope assembly (230), wherein the lower end of the turnbuckle bolt assembly (210) is detachably connected to the main body fixing frame (110), the upper end of the turnbuckle bolt assembly (210) is connected to the balance frame beam (220), one end of the lifting rope assembly (230) is connected to the balance frame beam (220), and the other end of the lifting rope assembly (230) is used to be connected to a crane.

8. The hoisting tool for the Dewar bottom side ring cold shield according to claim 7, characterized in that: The main body fixing frame (110) is provided with a plurality of main lifting ears (1154) on the horizontal frame (115) located at the top thereof. Correspondingly, a plurality of lower lifting ears (221) are provided at the lower portion of the balance frame beam (220). The turnbuckle bolt assembly (210) includes a plurality of turnbuckle bolts (211), and the plurality of turnbuckle bolts (211) are connected one-to-one between the plurality of main lifting ears (1154) and the plurality of lower lifting ears (221).

9. The hoisting tool for the Dewar bottom side ring cold shield according to claim 7, characterized in that: The upper portion of the balancing frame beam (220) is provided with a plurality of upper lifting ears (222); accordingly, the lifting rope assembly (230) includes a plurality of lifting ropes (231), one end of each of the plurality of lifting ropes (231) is connected to the plurality of upper lifting ears (222) via a third pin shaft (700), and the other end of each of the plurality of lifting ropes (231) is provided with a locking buckle (800).

10. A method for hoisting a cold shield at the bottom side ring of a dewar, characterized in that: The hoisting tool comprises a dewar bottom side ring cold shield according to any one of claims 1 to 9, and the hoisting method comprises: Connecting the cold screen to the hanging frame (100), and fixing adjacent ends of two adjacent cold screens to the main fixing assembly (112), and fixing the arc-outward end of the cold screen at the end to the temporary fixing assembly (122); One end of the sling (200) is connected to the top of the main body fixing frame (110), and the other end of the sling (200) is connected to a crane; The crane controls the movement of the spreader (200).

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