Adjustment tooling and method of the cold shield of the side ring at the bottom of the dewar in the PIT foundation pit

Abstract

The present invention belongs to the technical field of nuclear fusion devices, and discloses an adjustment tool and method for the side ring cold shield at the bottom of the dewar in a PIT foundation pit. Among them, in the adjustment tool, two first adjustment tools and two second adjustment tools are detachably fixed on the first isolation block and the second isolation block in the in-situ installation area of ​​the dewar base, and are used to adjust the horizontal position accuracy and vertical position accuracy of the cold shield module to be installed on the hoisting tool; the temporary support tool is detachably fixed on the third isolation block on the dewar base along the circumferential interval, and is used to support the bottom of the side ring cold shield at the bottom of the dewar formed by circumferential connection of multiple cold shield modules to be installed, and to adjust the vertical position accuracy of the side ring cold shield at the bottom of the dewar. The present invention can enable the large-sized and heavy-weight cold shield modules to be installed to be installed with high precision in the narrow installation space in the PIT foundation pit, without contaminating the dewar base, and is easy to disassemble and assemble.

Description

Technical Field

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

[0002] The Dewar cooling shield is a key component installed on the Dewar base for nuclear fusion devices. It provides thermal shielding for low-temperature superconducting magnets and other cryogenic components, reducing the heat load on the superconducting magnets and cryogenic components caused by thermal radiation or heat conduction. The Dewar bottom ring cooling shield aligns with the 16 neck tubes at the bottom. The various system components within the neck tubes are complex and must be docked and assembled with the Dewar cooling shield components to meet the design and installation requirements of each system component. The installation space within the PIT pit is limited, and the Dewar base must not be contaminated. The adjustment tooling and method for the Dewar bottom ring cooling shield must meet the required precision for the installation position of the Dewar bottom ring cooling shield. It also needs to be easy to install and disassemble, and the adjustment method must be simple.

[0003] Due to the large size (φ11.3*4.5m) and heavy weight (9 tons) of the Dewar bottom side ring cold shield, the installation precision in multiple directions is high (adjustment accuracy is 0.5mm), and the installation space is limited by components such as the gravity support, resulting in a narrow installation space (300mm high installation space, 38mm horizontal gap with the gravity support). At the same time, a counterweight structure needs to be added during the adjustment process to ensure the stability of the 1 / 4 and overall Dewar bottom side ring cold shields. This places higher requirements on the adjustment tooling and methods, ensuring that the 1 / 4 and overall Dewar bottom side ring cold shields are adjusted according to on-site measurement data during installation to ensure that the bottom side ring cold shields meet the position requirements after installation.

[0004] Conventional adjustment methods are primarily designed for components with large adjustment spaces, low installation precision, small size, and low weight. Conventional adjustment methods require little to no fixtures, large adjustment spaces, high precision requirements in a single direction, and low installation precision. Conventional adjustment tools and methods are not suitable for the adjustment of large, heavy, multi-directional precision cold shields, requiring high installation precision, narrow adjustment spaces, and requiring additional stability. Summary of the Invention

[0005] The present invention aims to at least partially address one of the technical problems in the related art. To this end, one objective of the present invention is to provide an adjustment fixture for the cold shield at the bottom of the dewar within the PIT pit. This fixture enables high-precision installation of large and heavy cold shield modules within the narrow installation space of the PIT pit, without contaminating the dewar base and facilitating assembly and disassembly.

[0006] According to an embodiment of the first aspect of the present invention, an adjustment tool for the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit is provided on the dewar base in the PIT foundation pit, wherein a mounting area corresponding to a lifting tool for fixing a cold shield module to be installed is placed; the lifting tool comprises an outer bracket and an inner bracket connected to each other in a radial direction, the outer bracket supports and fixes a single cold shield module to be installed and comprises a plurality of outer legs, the inner bracket comprises a plurality of inner legs, and the plurality of outer legs and the plurality of inner legs are arranged in a one-to-one correspondence along the radial direction of the lifting tool;

[0007] The adjustment tool comprises:

[0008] An adjustment tooling assembly is provided in the corresponding installation area; the adjustment tooling assembly includes two first adjustment tools and two second adjustment tools, the two first adjustment tools are detachably fixed to the first isolation block on the Dewar base, and are used to place two of the inner legs of the lifting tooling, and the two second adjustment tools are detachably fixed to the second isolation block on the Dewar base, and are used to place two of the outer legs of the lifting tooling; the two first adjustment tools and the two second adjustment tools are used to adjust the horizontal position accuracy and vertical position accuracy of the cold shield module to be installed on the lifting tooling;

[0009] A temporary support fixture is detachably fixed to the third isolation block on the Dewar base along the circumferential interval, and is used to support the bottom of the Dewar bottom side ring cold shield formed by circumferentially connecting a plurality of the cold shield modules to be installed, and to adjust the vertical position accuracy of the Dewar bottom side ring cold shield.

[0010] The adjustment fixture of the Dewar bottom side ring cold shield in the PIT foundation pit of the embodiment of the first aspect of the present invention has the following advantages: on the one hand, the hoisting fixture with the cold shield module to be installed is first placed on the two first adjustment fixtures and two second adjustment fixtures in the installation area by a hoisting vehicle, and then the multi-directional position accuracy of the cold shield module to be installed and the hoisting fixture is accurately adjusted by the first adjustment fixture and the second adjustment fixture, so that the large-sized and heavy-weight cold shield module to be installed can be installed with high precision in the narrow installation space in the PIT foundation pit; on the other hand, the first isolation block, the second isolation block and the third isolation block are fixed, for example They are welded and fixed on the Dewar base, serving as support points for the first adjustment tooling, the second adjustment tooling and the temporary support tooling respectively, making the overall adjustment tooling more stable, which is conducive to ensuring the stability of the position of the cold screen module to be installed and the hoisting tooling, while not affecting the installation of other components, ensuring that the installation position of the bottom side ring cold screen meets the design requirements, and at the same time, avoiding contamination of the Dewar base; on the other hand, the first adjustment tooling, the second adjustment tooling and the temporary support tooling are detachably fixed to the first isolation block, the second isolation block and the third isolation block, which facilitates the disassembly and assembly of the first adjustment tooling, the second adjustment tooling and the temporary support tooling.

[0011] In summary, the adjustment fixture of the Dewar bottom side ring cold shield in the PIT foundation pit of the first embodiment of the present invention can enable the large and heavy cold shield module to be installed to be installed with high precision in the narrow installation space in the PIT foundation pit without contaminating the Dewar base and facilitating disassembly and assembly.

[0012] In some embodiments, the first adjustment tool includes a first adjustment base, a first vertical adjustment mechanism, and a first horizontal adjustment mechanism; the first adjustment base has a first placement area for placing the inner leg, the first adjustment base is located above the first isolation block and is detachably fixed to the first adjustment base via the first vertical adjustment mechanism, and the first horizontal adjustment mechanism is disposed on the first adjustment base;

[0013] The second adjustment tool includes a second adjustment base plate, a second vertical adjustment mechanism, and a second horizontal adjustment mechanism; the second adjustment base plate has a second placement area for placing the outer legs, the second adjustment base plate is located above the second isolation block and is detachably fixed to the second adjustment base plate through the second vertical adjustment mechanism, and the second horizontal adjustment mechanism is provided on the second adjustment base plate;

[0014] The first vertical adjustment mechanism and the second vertical adjustment mechanism are used to adjust the vertical position accuracy of the cold shield module to be installed, and the first horizontal adjustment mechanism and the second horizontal adjustment mechanism are used to adjust the horizontal position accuracy of the cold shield module to be installed.

[0015] In some embodiments, the first vertical adjustment mechanism includes a plurality of first vertical guide bolts and a plurality of first vertical adjustment bolts; the plurality of first vertical guide bolts are spaced apart along the circumference of the first adjustment base plate, the plurality of first vertical guide bolts are threadedly connected to the first adjustment base plate, and the plurality of first vertical guide bolts abut against the upper surface of the first isolation block; the plurality of first vertical adjustment bolts are distributed between adjacent first vertical guide bolts, the plurality of first vertical adjustment bolts pass through the first adjustment base plate and are threadedly connected to the first isolation block;

[0016] The second vertical adjustment mechanism includes a plurality of second vertical guide bolts and a plurality of second vertical adjustment bolts; the plurality of second vertical guide bolts are distributed at intervals along the circumference of the second adjustment base plate, the plurality of second vertical guide bolts are threadedly connected to the second adjustment base plate, and the plurality of second vertical guide bolts abut against the upper surface of the second isolation block; the plurality of second vertical adjustment bolts are distributed between adjacent second vertical guide bolts, and the plurality of second vertical adjustment bolts pass through the second adjustment base plate and are threadedly connected to the second isolation block.

[0017] In some embodiments, the first horizontal adjustment mechanism includes three first support seats, three first nuts and three first horizontal adjustment bolts; the three first support seats are respectively fixed on three sides of the first adjustment base plate, the three first nuts are correspondingly fixed on the three first support seats, and the three first horizontal adjustment bolts are correspondingly threadedly engaged with the three first nuts; two of the first horizontal adjustment bolts are opposite to each other in the radial direction of the lifting fixture, and are used to adjust the radial horizontal position accuracy of the cold shield module to be installed; the other first horizontal adjustment bolts of the two first adjustment fixtures are opposite to each other, and are used to adjust the lateral horizontal position accuracy of the cold shield module to be installed;

[0018] The second horizontal adjustment mechanism includes a second support seat, a second nut and a second horizontal adjustment bolt; the second support seat is fixed on one side of the second adjustment base plate, the second nut is fixed on the second support seat, and the second horizontal adjustment bolt is threadedly engaged with the second nut; the second horizontal adjustment bolts of the two second adjustment toolings are opposite to each other, and are used to adjust the lateral horizontal position accuracy of the cold screen module to be installed.

[0019] In some embodiments, the two first adjustment fixtures and the two second adjustment fixtures are arranged in a one-to-one correspondence along the radial direction of the lifting fixture.

[0020] In some embodiments, the temporary support tooling includes a support base and a lifting mechanism. The support base is detachably fixed to the third isolation block. The lifting mechanism is arranged on the support base and is used to support the bottom of the Dewar bottom side ring cold shield.

[0021] In some embodiments, the support base is provided with a lifting hole extending downward from the top of the support base;

[0022] The lifting mechanism includes a bearing, an adjusting nut, a lifting screw and a lifting block; the adjusting nut is rotatably mounted on the support base through the bearing, the lifting screw is arranged in the lifting hole and is threadedly engaged with the adjusting nut, the top of the lifting screw is fixed to the lifting block, and the lifting block is used to support the bottom of the cold shield of the dewar bottom side ring.

[0023] In some embodiments, an adjustment hole is provided on the adjusting nut.

[0024] In some embodiments, a slot is provided on the top of the lifting block for clamping the bottom of the cold shield of the dewar bottom side ring.

[0025] In some embodiments, the adjustment tooling further includes at least one counterweight adjustment mechanism disposed on the bottom of the lifting tooling; when the lifting tooling on which the cold screen module to be installed is fixed reaches the installation area, the counterweight adjustment mechanism fine-tunes the center of gravity of the lifting tooling on which the cold screen module to be installed is fixed as needed.

[0026] In some embodiments, the counterweight adjustment mechanism includes a fixed base plate, a counterweight block, a fixed block, a fixed nut and an adjusting screw; the fixed base plate is fixed on the lifting fixture, the counterweight block can be stacked up and down and movably connected to the fixed base plate, the fixed block is fixed on the lifting fixture, the fixed block is closer to the inner bracket relative to the fixed base plate, one end of the adjusting screw is rotatably supported on the fixed block, a radially extending screw hole is provided in the lowest counterweight block, the fixing nut is fixed in the screw hole, and the adjusting screw is arranged in the screw hole and cooperates with the fixing nut thread.

[0027] In some embodiments, the counterweight adjustment mechanism further includes a guide block, which protrudes from the upper surface of the fixed base plate. The lower surface of the counterweight block is provided with a guide groove consistent with the direction of the adjustment screw, and the guide groove is slidably engaged with the guide block.

[0028] Another object of the present invention is to provide a method for adjusting the side ring cold shield at the bottom of the dewar in the PIT foundation pit.

[0029] According to the method for adjusting the cold shield of the Dewar bottom side ring body in the PIT foundation pit according to the second embodiment of the present invention, the adjustment tool of the cold shield of the Dewar bottom side ring body in the PIT foundation pit according to the first embodiment of the present invention is used to adjust the installation position accuracy of the cold shield module to be installed, and the adjustment method includes the following steps:

[0030] S1: When the lifting fixture with the cold shield module to be installed fixed thereon is lifted to the installation area by a lifting vehicle, the two inner legs and the two outer legs of the lifting fixture are placed on the two first adjustment fixtures and the two second adjustment fixtures respectively, while the lifting fixture is kept in a suspended state;

[0031] S2: first adjusting the horizontal position accuracy of the cold shield module to be installed, and then adjusting the vertical position accuracy, using the two first adjustment tools and the two second adjustment tools;

[0032] S3: The hoisting vehicle leaves the cold shield module to be installed and the hoisting tooling with adjusted position accuracy, and hoists the next hoisting tooling with the cold shield module to be installed to the next in-place installation area adjacent to the previous in-place installation area, and repeats steps S1 and S2; the cold shield modules to be installed in two adjacent in-place installation areas with adjusted position accuracy are connected in a circular manner; and so on, until the cold shield modules to be installed in all the in-place installation areas are connected in a circular manner in sequence to form a cold shield ring at the bottom side of the dewar;

[0033] S4: Raise the temporary support tooling to support the bottom of the cold shield of the side ring at the bottom of the dewar, and then remove all the hoisting tooling, the first adjustment tooling and the second adjustment tooling;

[0034] S5: After step S4, when the vertical position accuracy of the side ring cold shield at the bottom of the dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar derivation of a vertical position accuracy of the side ring cold shield at the bottom of the ...

[0035] Since the adjustment method of the Dewar bottom side ring cold shield in the PIT foundation pit of the second embodiment of the present invention adopts the adjustment tooling of the Dewar bottom side ring cold shield in the PIT foundation pit of the first embodiment of the present invention, the adjustment method of the Dewar bottom side ring cold shield in the PIT foundation pit of the second embodiment of the present invention has basically the same technical effect as the adjustment tooling of the Dewar bottom side ring cold shield in the PIT foundation pit of the first embodiment of the present invention.

[0036] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 2. This is a schematic diagram of a scene in which the adjustment tooling for the cold shield of the side ring body at the bottom of the dewar according to the first aspect of the present invention is used in the PIT foundation pit;

[0038] Figure 2 yes Figure 1 A partial enlarged schematic diagram;

[0039] Figure 3 This is a schematic diagram of assembling the Dewar bottom side ring cold shield using the adjustment tooling in the PIT foundation pit of the Dewar bottom side ring cold shield according to the first aspect of the present invention;

[0040] Figure 4 Schematic diagram of the corresponding positions of the adjustment fixtures of the Dewar bottom side ring cold shield in the PIT foundation pit in each in-situ installation area and each lifting fixture in accordance with the embodiment of the first aspect of the present invention;

[0041] Figure 5 yes Figure 4 A in the middle is an enlarged schematic diagram;

[0042] Figure 6 yes Figure 4 The enlarged schematic diagram of point B in the middle;

[0043] Figure 7 yes Figure 3 Enlarged schematic diagram at point C in the middle;

[0044] Figure 8 yes Figure 7 A cross-sectional diagram of the temporary support tooling;

[0045] Figure 9 yes Figure 4 The enlarged schematic diagram of point D in the middle;

[0046] Figure 10 yes Figure 9 Schematic cross-sectional view of ;

[0047] Figure 11 yes Figure 4 Enlarged schematic diagram at point E in the middle.

[0048] Reference numerals

[0049] Dewar base 1; first isolation block 11; second isolation block 12; third isolation block 13; fourth isolation block 14; Dewar bottom side ring cold shield 2; cold shield module to be installed 21; lifting fixture 3; inner bracket 31; inner leg 311; outer bracket 32; outer leg 321; adjustment fixture assembly 4; first adjustment fixture 41; first adjustment base plate 411; first placement area 4111; first vertical adjustment mechanism 412; first vertical guide bolt 4121; first vertical adjustment bolt 4122; first horizontal adjustment mechanism 413; first support seat 4131; first nut 4132; first horizontal adjustment bolt 4133; second adjustment fixture 42; second adjustment base plate 421 ; Second placement area 4211; Second vertical adjustment mechanism 422; Second vertical guide bolt 4221; Second vertical adjustment bolt 4222; Second horizontal adjustment mechanism 423; Second support seat 4231; Second nut 4232; Second horizontal adjustment bolt 4233; Third adjustment tooling 43; Temporary support tooling 5; Support base 51; Guide groove 511; Lifting mechanism 52; Bearing 521; Adjusting nut 522; Adjusting hole 5221; Lifting screw 523; Lifting block 524; Slot 5241; Counterweight adjustment mechanism 6; Fixed base plate 61; Counterweight block 62; Fixed block 63; Fixed nut 64; Adjusting screw 65; Guide block 66; Gravity support M. DETAILED DESCRIPTION

[0050] The following describes embodiments of the present invention in detail, examples of which 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 to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0051] The following combination Figures 1 to 11 The following describes the adjustment tooling and adjustment method of the Dewar bottom side ring cold shield in the PIT foundation pit according to an embodiment of the present invention.

[0052] like Figures 1 to 4As shown, according to the adjustment tooling of the Dewar bottom side ring cold shield in the PIT foundation pit according to the embodiment of the first aspect of the present invention, the Dewar base 1 in the PIT foundation pit is provided with an installation area corresponding to the hoisting tooling 3 for placing the cold shield module 21 to be installed; since the Dewar bottom side ring cold shield 2 requires a plurality of cold shield modules 21 to be installed to be connected in an annular direction, for example, the Dewar bottom side ring cold shield 2 (including 32 annularly divided minimum cold shield units) is composed of three 1 / 4 pre-assembled cold shield modules (the 1 / 4 pre-assembled cold shield module here is composed of The cold shield module 21 to be installed is preassembled from 8 minimum cold shield units, a 7 / 32 preassembled cold shield module (the 7 / 32 preassembled cold shield module here refers to the cold shield module 21 to be installed preassembled from 7 minimum cold shield units), and a 1 / 32 cold shield module (the 1 / 32 cold shield module here refers to a minimum cold shield unit, i.e., the cold shield module 21 to be installed) are connected in a ring. Therefore, multiple installation areas are required, and one installation area is used to position a lifting fixture 3 with a cold shield module 21 to be installed. The lifting fixture 3 includes an outer bracket 32 ​​and an inner bracket 31 connected to each other in the radial direction. The outer bracket 32 ​​supports and fixes a single cold shield module 21 to be installed and includes multiple outer legs 321. The inner bracket 31 includes multiple inner legs 311. The multiple outer legs 321 and the multiple inner legs 311 are arranged in a one-to-one correspondence along the radial direction of the lifting fixture 3. The lifting fixture 3 can stably support and fix the cold shield module 21 to be installed.

[0053] like Figures 1 to 11 As shown, the adjustment tooling of the first embodiment of the present invention includes an adjustment tooling assembly 4 and a temporary support tooling 5 .

[0054] The adjustment tooling assembly 4 is arranged in the corresponding in-place installation area, and one adjustment tooling assembly 4 is arranged in one in-place installation area. In a single in-place installation area, the adjustment tooling assembly 4 includes two first adjustment tools 41 and two second adjustment tools 42. The two first adjustment tools 41 are detachably fixed on the first isolation block 11 on the dewar base 1, and are used to place two of the inner legs 311 of the lifting tool 3; wherein, the first isolation block 11 isolates the first adjustment tool 41 from the dewar base 1 to avoid contamination of the dewar base 1, and at the same time provides a stable support point for the lifting tool 3; the first adjustment tool 41 is detachably connected to the first isolation block 11, which is conducive to the quick and convenient removal of the first adjustment tool 41 after the installation of the side ring cold screen 2 at the bottom of the dewar is completed; when the cold screen module 21 to be installed and the lifting tool 3 are hoisted to the in-place installation area by a hoisting vehicle, the two first adjustment tools 41 can support the two inner legs 311 of the lifting tool 3 to adjust the position accuracy of the cold screen to be installed. The two second adjustment fixtures 42 are detachably fixed on the second isolation block 12 on the Dewar base 1, and are used to place two of the outer legs 321 of the lifting fixture 3; wherein, the second isolation block 12 isolates the second adjustment fixture 42 from the Dewar base 1 to avoid contaminating the Dewar base 1, and at the same time provides a stable support point for the lifting fixture 3; the second adjustment fixture 42 is detachably connected to the second isolation block 12, which is conducive to the second adjustment fixture 42 being able to be quickly and conveniently removed after the installation of the side ring cold screen 2 at the bottom of the Dewar is completed; when the cold screen module 21 to be installed and the lifting fixture 3 are lifted to the installation area by a lifting vehicle, the two second adjustment fixtures 42 can support the two outer legs 321 of the lifting fixture 3 to adjust the position accuracy of the cold screen to be installed. The two first adjustment fixtures 41 and the two second adjustment fixtures 42 are used to adjust the horizontal position accuracy and vertical position accuracy of the cold shield module 21 to be installed on the lifting fixture 3, that is, the two first adjustment fixtures 41 and the two second adjustment fixtures 42 are used to adjust the installation position accuracy of the cold shield module 21 to be installed.

[0055] Temporary support fixtures 5 are detachably fixed to the third isolation block 13 on the dewar base 1 at circumferential intervals. They are used to support the bottom of the dewar bottom side ring cold shield 2, which is formed by circumferentially connecting multiple cold shield modules 21 to be installed, and to adjust the vertical position accuracy of the dewar bottom side ring cold shield 2. The number of temporary support fixtures 5 matches the number of the aforementioned minimum cold shield units, so that the temporary support fixtures 5 support the bottom of the minimum cold shield unit in a one-to-one correspondence. The temporary support fixtures 5 are detachably connected to the third isolation block 13, facilitating quick and convenient removal of the temporary support fixtures 5 after the entire dewar cold shield (including the dewar bottom side ring cold shield 2) is installed. When the cold shield modules 21 to be installed and the lifting fixture 3 are hoisted to the installation area by a trolley, and when the installation position accuracy of the cold shield modules 21 to be installed is adjusted by the first adjustment fixture 41 and the second adjustment fixture 42, the temporary support fixtures 5 do not support the cold shield modules 21 to be installed. When multiple cold shield modules 21 to be installed are connected in an annular manner to form the Dewar bottom side ring cold shield 2, the temporary support tooling 5 rises from the bottom of the Dewar bottom side ring cold shield 2 to support the Dewar bottom side ring cold shield 2 and ensure the installation position accuracy of the Dewar bottom side ring cold shield 2.

[0056] The adjustment process of the adjustment tool of the Dewar bottom side ring cold shield in the PIT foundation pit of the embodiment of the first aspect of the present invention is as follows:

[0057] First, when the lifting fixture 3 fixed with the cold screen module 21 to be installed is lifted to the installation area by a lifting vehicle, the two inner legs 311 and the two outer legs 321 of the lifting fixture 3 are respectively placed on the two first adjustment fixtures 41 and the two second adjustment fixtures 42, while keeping the lifting fixture 3 in a suspended state. Since the cold screen module 21 to be installed is large in size and heavy in weight, the hoisting tooling 3 and the cold screen module 21 to be installed are supported on the first adjustment tooling 41 and the second adjustment tooling 42, and the hoisting tooling 3 and the cold screen module 21 to be installed are kept in a suspended state by a hoisting vehicle, which is conducive to the cold screen module 21 to be installed being able to be moved by the hoisting vehicle during the position accuracy adjustment process. After the final installation position of the cold screen module 21 to be installed is determined, the corresponding inner legs 311 and outer legs 321 are fixed by the first adjustment tooling 41 and the second adjustment tooling 42 to ensure the stability of the hoisting tooling 3 and the cold screen module 21 to be installed, and to prevent the hoisting tooling 3 and the cold screen module 21 to be installed from tipping over or shifting.

[0058] Then, the horizontal position accuracy of the cold shield module 21 to be installed is first adjusted using the two first adjustment fixtures 41 and the two second adjustment fixtures 42, and then the vertical position accuracy is adjusted. Specifically, when adjusting the position accuracy of the cold shield module 21 to be installed, the two first adjustment fixtures 41 and the two second adjustment fixtures 42 are used for adjustment, while the hoisting device 3 and the cold shield module 21 to be installed are moved in coordination.

[0059] When the position accuracy of a cold screen module 21 to be installed and the lifting tool 3 are adjusted in an in-place installation area, the lifting vehicle leaves the cold screen module 21 to be installed and the lifting tool 3 with adjusted position accuracy, and lifts the next lifting tool 3 with the cold screen module 21 to be installed to the next in-place installation area adjacent to the previous in-place installation area, repeats the above-mentioned process of adjusting the position accuracy of the previous cold screen to be installed to adjust the position accuracy of the next cold screen module 21 to be installed, and then connects the cold screen modules 21 to be installed in two adjacent in-place installation areas with adjusted position accuracy in a ring shape; and so on, until the cold screen modules 21 to be installed in all in-place installation areas are connected in a ring shape in sequence to form a cold screen 2 on the side ring of the Dewar bottom.

[0060] After the Dewar bottom side ring cold screen 2 is connected and assembled, the temporary support tooling 5 is raised and supported on the bottom of the Dewar bottom side ring cold screen 2 to ensure the installation position accuracy of the Dewar bottom side ring cold screen 2 and improve the installation accuracy of the bottom side ring cold screen; after that, all the lifting tooling 3, the first adjustment tooling 41 and the second adjustment tooling 42 are removed.

[0061] Since the dewar bottom side ring cold shield 2 needs to be supported on the temporary support fixture 5 for a long time (for example, one to two years) after being assembled and connected, when the vertical position accuracy of the dewar bottom side ring cold shield 2 deviates, the vertical position accuracy of the dewar bottom side ring cold shield 2 is adjusted by the temporary support fixture 5, thereby ensuring the installation position accuracy of the dewar bottom side ring cold shield 2. It should be noted that the temporary support fixture 5 needs to be removed after the dewar bottom side ring cold shield and related structural systems are installed.

[0062] The adjustment fixture of the Dewar bottom side ring cold screen in the PIT foundation pit of the embodiment of the first aspect of the present invention has the following advantages: on the one hand, the hoisting fixture 3 fixed with the cold screen module 21 to be installed is first placed on the two first adjustment fixtures 41 and the two second adjustment fixtures 42 in the installation area by a hoisting vehicle, and then the multi-directional position accuracy of the cold screen module 21 to be installed and the hoisting fixture 3 is accurately adjusted by the first adjustment fixture 41 and the second adjustment fixture 42, so that the large-sized and heavy cold screen module 21 to be installed can be installed with high precision in the narrow installation space in the PIT foundation pit, and the collision between the cold screen module 21 to be installed and the hoisting fixture 3 and the gravity support M can be avoided; on the other hand, the first isolation block 11 and the second isolation block 11 are fixed on the two first adjustment fixtures 41 and the second adjustment fixture 42. The isolation block 12 and the third isolation block 13 are fixed on the Dewar base 1, for example, by welding, and serve as support points for the first adjustment tooling 41, the second adjustment tooling 42 and the temporary support tooling 5 respectively, making the overall adjustment tooling more stable, which is conducive to ensuring the stability of the position of the cold screen module 21 to be installed and the lifting tooling 3, while not affecting the installation of other components, ensuring that the installation position of the bottom side ring cold screen meets the design requirements, and at the same time, avoiding contamination of the Dewar base 1; on the other hand, the first adjustment tooling 41, the second adjustment tooling 42 and the temporary support tooling 5 are detachably fixed to the first isolation block 11, the second isolation block 12 and the third isolation block 13, which facilitates the disassembly and assembly of the first adjustment tooling 41, the second adjustment tooling 42 and the temporary support tooling 5.

[0063] In summary, the adjustment fixture of the Dewar bottom side ring cold shield in the PIT foundation pit of the first embodiment of the present invention can enable the large and heavy cold shield module to be installed to be installed with high precision in the narrow installation space in the PIT foundation pit without contaminating the Dewar base and facilitating disassembly and assembly.

[0064] In some embodiments, as Figures 2 to 6 As shown, the first adjustment tooling 41 includes a first adjustment base plate 411, a first vertical adjustment mechanism 412 and a first horizontal adjustment mechanism 413; the first adjustment base plate 411 has a first placement area 4111 for placing the inner leg 311, the first adjustment base plate 411 is located above the first isolation block 11 and is detachably fixed to the first adjustment base plate 411 through the first vertical adjustment mechanism 412, and the first horizontal adjustment mechanism 413 is arranged on the first adjustment base plate 411.

[0065] The second adjustment tooling 42 includes a second adjustment base plate 421, a second vertical adjustment mechanism 422 and a second horizontal adjustment mechanism 423; the second adjustment base plate 421 has a second placement area 4211 for placing the outer leg 321, the second adjustment base plate 421 is located above the second isolation block 12 and is detachably fixed to the second adjustment plate through the second vertical adjustment mechanism 422, and the second horizontal adjustment mechanism 423 is arranged on the second adjustment base plate 421.

[0066] The first vertical adjustment mechanism 412 and the second vertical adjustment mechanism 422 are used to adjust the vertical position accuracy of the cold shield module 21 to be installed, and the first horizontal adjustment mechanism 413 and the second horizontal adjustment mechanism 423 are used to adjust the horizontal position accuracy of the cold shield module 21 to be installed.

[0067] Thus, the first adjustment fixture 41 and the second adjustment fixture 42 cooperate to adjust the position accuracy of the cold shield module 21 to be installed in multiple directions, achieving high installation position adjustment accuracy. The first adjustment fixture 41 and the second adjustment fixture 42 have a simple structure and are easy to install and remove, improving the installation accuracy of the cold shield 2 at the bottom side ring of the dewar, and significantly reducing installation and adjustment time.

[0068] In some embodiments, the first vertical adjustment mechanism 412 includes a plurality of first vertical guide bolts 4121 and a plurality of first vertical adjustment bolts 4122; the plurality of first vertical guide bolts 4121 are distributed at circumferential intervals along the first adjustment base plate 411, the plurality of first vertical guide bolts 4121 are threadedly connected to the first adjustment base plate 411, and the plurality of first vertical guide bolts 4121 abut against the upper surface of the first isolation block 11; the plurality of first vertical adjustment bolts 4122 are distributed between adjacent first vertical guide bolts 4121, the plurality of first vertical adjustment bolts 4122 pass through the first adjustment base plate 411 and are threadedly connected to the first isolation block 11.

[0069] The second vertical adjustment mechanism 422 includes a plurality of second vertical guide bolts 4221 and a plurality of second vertical adjustment bolts 4222; the plurality of second vertical guide bolts 4221 are distributed at circumferential intervals along the second adjustment base plate 421, the plurality of second vertical guide bolts 4221 are threadedly connected to the second adjustment base plate 421, and the plurality of second vertical guide bolts 4221 abut against the upper surface of the second isolation block 12; the plurality of second vertical adjustment bolts 4222 are distributed between adjacent second vertical guide bolts 4221, and the plurality of second vertical adjustment bolts 4222 pass through the second adjustment base plate 421 and are threadedly connected to the second isolation block 12.

[0070] The first vertical adjustment mechanism 412 and the second vertical adjustment mechanism 422 have a simple structure and are easy to install and disassemble. They can be adjusted either individually or in combination, while ensuring that the adjustment accuracy and function meet the requirements, greatly saving installation and adjustment time.

[0071] In some embodiments, the first horizontal adjustment mechanism 413 includes three first support seats 4131, three first nuts 4132 and three first horizontal adjustment bolts 4133; the three first support seats 4131 are respectively fixed on the three sides of the first adjustment base plate 411, the three first nuts 4132 are correspondingly fixed on the three first support seats 4131, and the three first horizontal adjustment bolts 4133 are correspondingly threadedly engaged with the three first nuts 4132; two of the first horizontal adjustment bolts 4133 are opposite to each other in the radial direction of the lifting tool 3, and are used to adjust the radial horizontal position accuracy of the cold screen module 21 to be installed; the other first horizontal adjustment bolts 4133 of the two first adjustment tools 41 are opposite to each other, and are used to adjust the lateral horizontal position accuracy of the cold screen module 21 to be installed.

[0072] The second horizontal adjustment mechanism 423 includes a second support seat 4231, a second nut 4232 and a second horizontal adjustment bolt 4233; the second support seat 4231 is fixed on one side of the second adjustment base plate 421, the second nut 4232 is fixed on the second support seat 4231, and the second horizontal adjustment bolt 4233 is threadedly engaged with the second nut 4232; the second horizontal adjustment bolts 4233 of the two second adjustment toolings 42 are opposite to each other, and are used to adjust the horizontal position accuracy of the cold screen module 21 to be installed.

[0073] Specifically, when the cold screen module 21 to be installed is radially adjusted, after the cold screen module 21 to be installed is radially moved to the final designated position by a hoisting vehicle, two of the first horizontal adjustment bolts 4133 of each first adjustment tool 41 are radially tightened against the corresponding inner legs 311; when the cold screen module 21 to be installed is laterally adjusted, after the cold screen module 21 to be installed is laterally moved to the final designated position by a hoisting vehicle, another of the first horizontal adjustment bolts 4133 of the two first adjustment toolings 41 and the second horizontal adjustment bolts 4233 of the two second adjustment toolings 42 are relative to each other and tightened against the corresponding two inner legs 311 and two outer legs 321.

[0074] The first horizontal adjustment mechanism 413 and the second horizontal adjustment mechanism 423 have simple structures and are easy to install and disassemble. They can be adjusted either individually or in combination, thereby improving the installation accuracy of the bottom side ring cold shield.

[0075] In some embodiments, the two first adjustment fixtures 41 and the two second adjustment fixtures 42 are arranged in a one-to-one correspondence along the radial direction of the hoisting fixture 3. In this way, the arrangement is more reasonable and the installation position accuracy adjustment is more convenient.

[0076] In some embodiments, as Figures 2 to 4 and Figures 7 and 8As shown, the temporary support fixture 5 includes a support base 51 and a lifting mechanism 52. The support base 51 is detachably fixed on the third isolation block 13. The lifting mechanism 52 is arranged on the support base 51. The lifting mechanism 52 is used to support the bottom of the Dewar bottom side ring cold shield 2.

[0077] When the dewar bottom side ring cold shield 2 is finally in place, the temporary support tool 5 supports the bottom of the dewar bottom side ring cold shield 2 through the lifting mechanism 52, and can adjust the vertical position of the dewar bottom side ring cold shield 2, thereby improving the installation accuracy of the dewar bottom side ring cold shield 2. The temporary support tool 5 has a simple structure and is easy to assemble and disassemble.

[0078] In some embodiments, the support base 51 is provided with a lifting hole extending downward from the top of the support base 51. The lifting mechanism 52 includes a bearing 521, an adjusting nut 522, a lifting screw 523, and a lifting block 524. The adjusting nut 522 is rotatably mounted on the support base 51 via the bearing 521. The lifting screw 523 is disposed in the lifting hole and threadably engages with the adjusting nut 522. The top of the lifting screw 523 is fixed to the lifting block 524, which is used to support the bottom of the dewar bottom side ring cold shield 2.

[0079] The temporary support tooling 5 uses a lifting screw 523 and an adjusting nut 522 to vertically adjust the Dewar bottom side ring cold screen 2. It has a simple structure and is easy to disassemble and assemble. At the same time, the temporary support tooling 5 can adjust the vertical position when the Dewar bottom side ring cold screen 2 is finally in place, thereby improving the installation accuracy of the bottom side ring cold screen.

[0080] In some embodiments, an adjustment hole 5221 is provided on the adjustment nut 522. By inserting an adjustment tool into the adjustment hole 5221, the vertical position accuracy of the Dewar bottom side ring cold shield 2 can be adjusted.

[0081] In some embodiments, a slot 5241 is provided on the top of the lifting block 524 for clamping the bottom of the Dewar bottom side ring cold shield 2, ensuring that the temporary support tooling 5 can reliably support the Dewar bottom side ring cold shield 2.

[0082] In some embodiments, the lifting hole includes a guide groove 511 located at the top of the support base 51. The guide groove 511 is adaptively matched with the screw head of the adjusting screw 65 in a vertical sliding manner to play a vertical guiding role.

[0083] In some embodiments, as Figures 2 to 4 and Figure 11As shown, the adjustment fixture assembly 4 also includes a third adjustment fixture 43, which is detachably fixed to the fourth isolation block 14 of the in-place installation area of ​​the dewar base 1. The third adjustment fixture 43 is used to correspondingly support the outer legs 321 and the inner legs 311 at both ends of the lifting fixture 3 to adjust the vertical position accuracy of the lifting fixture 3. The specific structure of the third adjustment fixture 43 is similar to that of the second adjustment fixture 42: the third adjustment fixture 43 omits the second horizontal adjustment mechanism 423 of the second adjustment fixture 42, and the remaining structures are the same.

[0084] In some embodiments, as Figures 2 to 4 and Figures 9 and 10 As shown, the adjustment tooling also includes at least one counterweight adjustment mechanism 6 arranged on the bottom of the hoisting tooling 3; when the hoisting tooling 3 fixed with the cold shield module 21 to be installed arrives at the installation area, the counterweight adjustment mechanism 6 fine-tunes the center of gravity of the hoisting tooling 3 fixed with the cold shield module 21 to be installed as needed, thereby increasing the stability of the entire component during the installation position accuracy adjustment process and ensuring that the installation accuracy of the side ring cold shield 2 at the bottom of the dewar meets the requirements.

[0085] In some embodiments, the counterweight adjustment mechanism 6 includes a fixed base plate 61, a counterweight block 62, a fixed block 63, a fixed nut 64 and an adjusting screw 65; the fixed base plate 61 is fixed on the lifting fixture 3, the counterweight block 62 can be stacked up and down and movably connected to the fixed base plate 61, the fixed block 63 is fixed on the lifting fixture 3, the fixed block 63 is closer to the inner bracket 31 relative to the fixed base plate 61, one end of the adjusting screw 65 is rotatably supported on the fixed block 63, and a radially extending screw hole is provided in the lowest counterweight block 62, the fixing nut 64 is fixed in the screw hole, and the adjusting screw 65 is arranged in the screw hole and threadedly engaged with the fixing nut 64.

[0086] The counterweight adjustment mechanism 6 adopts an adjustment method of adjusting the screw 65 and the fixing nut 64, which has a simple structure and is easy to disassemble and assemble. The overall center of gravity position is adjusted by rotating the adjusting screw 65, which increases the stability of the entire component during the installation position accuracy adjustment process and ensures that the installation accuracy of the Dewar bottom side ring cold shield 2 meets the requirements.

[0087] In some embodiments, the counterweight adjustment mechanism 6 also includes a guide block 66, which protrudes from the upper surface of the fixed base plate 61. The lower surface of the counterweight block 62 is provided with a guide groove 511 consistent with the direction of the adjustment screw 65. The guide groove 511 slides in conjunction with the guide block 66, which is conducive to the stable movement of the counterweight block 62.

[0088] like Figures 1 to 11As shown, the method for adjusting the cold shield of the Dewar bottom side ring body in the PIT foundation pit according to the second embodiment of the present invention is characterized in that the adjustment tool for the cold shield of the Dewar bottom side ring body in the PIT foundation pit according to the first embodiment of the present invention is used to adjust the installation position accuracy of the cold shield module 21 to be installed, and the adjustment method includes the following steps:

[0089] S1: When the lifting fixture 3 fixed with the cold screen module 21 to be installed is lifted to the installation area by a lifting vehicle, the two inner legs 311 and the two outer legs 321 of the lifting fixture 3 are placed on the two first adjustment fixtures 41 and the two second adjustment fixtures 42 respectively, while keeping the lifting fixture 3 in a suspended state.

[0090] Since the cold screen module 21 to be installed is large in size and heavy in weight, the hoisting tooling 3 and the cold screen module 21 to be installed are supported on the first adjustment tooling 41 and the second adjustment tooling 42, and the hoisting tooling 3 and the cold screen module 21 to be installed are kept in a suspended state by a hoisting vehicle, which is conducive to the cold screen module 21 to be installed being able to be moved by the hoisting vehicle during the position accuracy adjustment process; after the final installation position of the cold screen module 21 to be installed is determined, the corresponding inner legs 311 and outer legs 321 are fixed by the first adjustment tooling 41 and the second adjustment tooling 42 to ensure the stability of the hoisting tooling 3 and the cold screen module 21 to be installed, and to prevent the hoisting tooling 3 and the cold screen module 21 to be installed from tipping over or shifting.

[0091] S2: firstly adjust the horizontal position accuracy of the cold shield module 21 to be installed by using two first adjustment fixtures 41 and two second adjustment fixtures 42 , and then adjust the vertical position accuracy.

[0092] Specifically, when adjusting the position accuracy of the cold shield module 21 to be installed, the adjustment is performed through two first adjustment fixtures 41 and two second adjustment fixtures 42 , and at the same time, the hoisting vehicle cooperates with the moving hoisting fixture 5 and the cold shield module 21 to be installed.

[0093] S3: The hoisting vehicle leaves the cold shield module 21 to be installed and the hoisting tool 3 with adjusted position accuracy, and hoists the next hoisting tool 3 with the cold shield module 21 to be installed to the next installation area adjacent to the previous installation area, and repeats steps S1 and S2; the cold shield modules 21 to be installed with adjusted position accuracy in two adjacent installation areas are connected in a circular manner; and so on, until the cold shield modules 21 to be installed in all installation areas are connected in a circular manner in sequence to form a cold shield 2 on the side ring of the bottom of the dewar.

[0094] S4: Raise the temporary support tool 5 and support it on the bottom of the cold shield 2 of the side ring at the bottom of the dewar. Then, remove all the lifting tools 3, the first adjustment tool 41 and the second adjustment tool 42.

[0095] S5: After step S4, when the vertical position accuracy of the Dewar bottom side ring cold shield 2 deviates, the vertical position accuracy of the Dewar bottom side ring cold shield 2 is adjusted by the temporary support tool 5.

[0096] Since the adjustment method of the Dewar bottom side ring cold shield in the PIT foundation pit of the second embodiment of the present invention adopts the adjustment tooling of the Dewar bottom side ring cold shield in the PIT foundation pit of the first embodiment of the present invention, the adjustment method of the Dewar bottom side ring cold shield in the PIT foundation pit of the second embodiment of the present invention has basically the same technical effect as the adjustment tooling of the Dewar bottom side ring cold shield in the PIT foundation pit of the first embodiment of the present invention.

[0097] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An adjustment tool for the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit, characterized in that: The Dewar base in the PIT foundation pit is provided with an in-place installation area for placing a lifting fixture corresponding to the cold shield module to be installed; the lifting fixture includes an outer bracket and an inner bracket radially connected to each other, the outer bracket supports and fixes a single cold shield module to be installed and includes a plurality of outer legs, the inner bracket includes a plurality of inner legs, and the plurality of outer legs and the plurality of inner legs are arranged in a one-to-one correspondence along the radial direction of the lifting fixture; The adjustment tool comprises: An adjustment tooling assembly is provided in the corresponding installation area; the adjustment tooling assembly includes two first adjustment tools and two second adjustment tools, the two first adjustment tools are detachably fixed to the first isolation block on the Dewar base, and are used to place two of the inner legs of the lifting tooling, and the two second adjustment tools are detachably fixed to the second isolation block on the Dewar base, and are used to place two of the outer legs of the lifting tooling; the two first adjustment tools and the two second adjustment tools are used to adjust the horizontal position accuracy and vertical position accuracy of the cold shield module to be installed on the lifting tooling; A temporary support fixture is detachably fixed to the third isolation block on the Dewar base along the circumferential interval, and is used to support the bottom of the Dewar bottom side ring cold shield formed by circumferentially connecting a plurality of the cold shield modules to be installed, and to adjust the vertical position accuracy of the Dewar bottom side ring cold shield.

2. The adjustment tool for the Dewar bottom side ring cold shield in the PIT foundation pit according to claim 1 is characterized in that: The first adjustment tool comprises a first adjustment base plate, a first vertical adjustment mechanism, and a first horizontal adjustment mechanism; the first adjustment base plate has a first placement area for placing the inner legs, the first adjustment base plate is located above the first isolation block and is detachably fixed to the first adjustment base plate via the first vertical adjustment mechanism, and the first horizontal adjustment mechanism is disposed on the first adjustment base plate; The second adjustment tool includes a second adjustment base plate, a second vertical adjustment mechanism and a second horizontal adjustment mechanism; The second adjustment base plate has a second placement area for placing the outer legs, the second adjustment base plate is located above the second isolation block and is detachably fixed to the second adjustment base plate through the second vertical adjustment mechanism, and the second horizontal adjustment mechanism is provided on the second adjustment base plate; The first vertical adjustment mechanism and the second vertical adjustment mechanism are used to adjust the vertical position accuracy of the cold shield module to be installed, and the first horizontal adjustment mechanism and the second horizontal adjustment mechanism are used to adjust the horizontal position accuracy of the cold shield module to be installed.

3. The adjustment tool for the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit according to claim 2 is characterized in that: The first vertical adjustment mechanism includes a plurality of first vertical guide bolts and a plurality of first vertical adjustment bolts; the plurality of first vertical guide bolts are spaced apart along the circumference of the first adjustment base plate, the plurality of first vertical guide bolts are threadedly connected to the first adjustment base plate, and the plurality of first vertical guide bolts abut against the upper surface of the first isolation block; the plurality of first vertical adjustment bolts are distributed between adjacent first vertical guide bolts, the plurality of first vertical adjustment bolts pass through the first adjustment base plate and are threadedly connected to the first isolation block; The second vertical adjustment mechanism includes a plurality of second vertical guide bolts and a plurality of second vertical adjustment bolts; the plurality of second vertical guide bolts are distributed at intervals along the circumference of the second adjustment base plate, the plurality of second vertical guide bolts are threadedly connected to the second adjustment base plate, and the plurality of second vertical guide bolts abut against the upper surface of the second isolation block; the plurality of second vertical adjustment bolts are distributed between adjacent second vertical guide bolts, and the plurality of second vertical adjustment bolts pass through the second adjustment base plate and are threadedly connected to the second isolation block.

4. The adjustment tool for the cold shield of the Dewar bottom side ring in the PIT foundation pit according to claim 2 is characterized in that: The first horizontal adjustment mechanism includes three first support seats, three first nuts and three first horizontal adjustment bolts; the three first support seats are respectively fixed on three sides of the first adjustment base plate, the three first nuts are correspondingly fixed on the three first support seats, and the three first horizontal adjustment bolts are correspondingly threadedly engaged with the three first nuts; two of the first horizontal adjustment bolts are opposite to each other in the radial direction of the lifting fixture, and are used to adjust the radial horizontal position accuracy of the cold shield module to be installed; the other first horizontal adjustment bolts of the two first adjustment fixtures are opposite to each other, and are used to adjust the lateral horizontal position accuracy of the cold shield module to be installed; The second horizontal adjustment mechanism includes a second support seat, a second nut and a second horizontal adjustment bolt; the second support seat is fixed on one side of the second adjustment base plate, the second nut is fixed on the second support seat, and the second horizontal adjustment bolt is threadedly engaged with the second nut; the second horizontal adjustment bolts of the two second adjustment toolings are opposite to each other, and are used to adjust the lateral horizontal position accuracy of the cold screen module to be installed.

5. The adjustment tool for the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit according to claim 1 is characterized in that: The two first adjustment fixtures and the two second adjustment fixtures are arranged in a one-to-one correspondence along the radial direction of the lifting fixture.

6. The adjustment tool for the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit according to claim 1 is characterized in that: The temporary support fixture includes a support base and a lifting mechanism. The support base is detachably fixed on the third isolation block. The lifting mechanism is arranged on the support base and is used to support the bottom of the Dewar bottom side ring cold shield.

7. The adjustment tool for the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit according to claim 6 is characterized in that: The support base is provided with a lifting hole extending downward from the top of the support base; The lifting mechanism includes a bearing, an adjusting nut, a lifting screw and a lifting block; the adjusting nut is rotatably mounted on the support base through the bearing, the lifting screw is arranged in the lifting hole and is threadedly engaged with the adjusting nut, the top of the lifting screw is fixed to the lifting block, and the lifting block is used to support the bottom of the cold shield of the dewar bottom side ring.

8. The adjustment tool for the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit according to claim 7 is characterized in that: An adjusting hole is provided on the adjusting nut.

9. The adjustment tool for the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit according to claim 7 is characterized in that: The top of the lifting block is provided with a clamping groove for clamping the bottom of the side ring cold shield of the Dewar bottom.

10. The adjustment tool for the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit according to claim 1 is characterized in that: The adjustment tooling also includes at least one counterweight adjustment mechanism arranged on the bottom of the hoisting tooling; when the hoisting tooling on which the cold screen module to be installed is fixed reaches the installation area, the counterweight adjustment mechanism fine-tunes the center of gravity of the hoisting tooling on which the cold screen module to be installed is fixed as needed.

11. The adjustment tool for the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit according to claim 10, characterized in that: The counterweight adjustment mechanism includes a fixed base plate, a counterweight block, a fixed block, a fixed nut and an adjusting screw; the fixed base plate is fixed on the lifting fixture, the counterweight block can be stacked up and down and flexibly connected to the fixed base plate, the fixed block is fixed on the lifting fixture, the fixed block is closer to the inner bracket relative to the fixed base plate, one end of the adjusting screw is rotatably supported on the fixed block, a radially extending screw hole is provided in the lowest counterweight block, the fixing nut is fixed in the screw hole, the adjusting screw is arranged in the screw hole and cooperates with the fixing nut thread.

12. The adjustment tool for the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit according to claim 11, characterized in that: The counterweight adjustment mechanism further includes a guide block protruding from the upper surface of the fixed base plate. The lower surface of the counterweight block is provided with a guide groove consistent with the direction of the adjustment screw, and the guide groove is slidably engaged with the guide block.

13. A method for adjusting the cold shield of the side ring body at the bottom of the dewar in the PIT foundation pit, characterized in that: The adjustment tooling for the cold shield at the bottom side ring of the dewar according to claim 1 is used in the PIT foundation pit to adjust the installation position accuracy of the cold shield module to be installed, and the adjustment method comprises the following steps: S1: When the lifting fixture with the cold shield module to be installed fixed thereon is lifted to the installation area by a lifting vehicle, the two inner legs and the two outer legs of the lifting fixture are placed on the two first adjustment fixtures and the two second adjustment fixtures respectively, while the lifting fixture is kept in a suspended state; S2: first adjusting the horizontal position accuracy of the cold shield module to be installed, and then adjusting the vertical position accuracy, using the two first adjustment tools and the two second adjustment tools; S3: The hoisting vehicle leaves the cold shield module to be installed and the hoisting tooling with adjusted position accuracy, and hoists the next hoisting tooling with the cold shield module to be installed to the next in-place installation area adjacent to the previous in-place installation area, and repeats steps S1 and S2; the cold shield modules to be installed in two adjacent in-place installation areas with adjusted position accuracy are connected in a circular manner; and so on, until the cold shield modules to be installed in all the in-place installation areas are connected in a circular manner in sequence to form a cold shield ring at the bottom side of the dewar; S4: Raise the temporary support tooling to support the bottom of the cold shield of the side ring at the bottom of the dewar, and then remove all the hoisting tooling, the first adjustment tooling and the second adjustment tooling; S5: After step S4, when the vertical position accuracy of the side ring cold shield at the bottom of the dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar dewar derivation of a vertical position accuracy of the side ring cold shield at the bottom of the ...

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