Matching Method, Device and Related Equipment for Assembly Pre-tightening Force of Bolt Connection Structure

Abstract

The present invention provides a method, device and related equipment for matching the assembly pre-tightening force of a bolt connection structure. The matching method includes: obtaining the assembly pre-tightening force and the axial allowable stress of the bolt connection structure at normal temperature; performing a thermo-mechanical coupling simulation analysis on the bolt connection structure to obtain the axial force of the bolt connection structure under ultra-deep cryogenic conditions; calculating the change value of the assembly pre-tightening force under the ultra-deep cryogenic conditions based on the axial force and the assembly pre-tightening force; and performing matching correction on the assembly pre-tightening force based on the absolute value of the change value of the assembly pre-tightening force and the axial allowable stress. The matching method provides a solution to the problem of the increase or loss of the pre-tightening force caused by different thermal expansion coefficients of dissimilar metal connecting bolts under ultra-deep cryogenic conditions based on thermo-mechanical coupling simulation, and ensures the reliability of the structure under ultra-deep cryogenic conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical connection, and more particularly to a method and device for matching the assembly pre-tightening force of a bolt connection structure and related equipment. Background Art

[0002] In the field of superconducting magnets and cryogenic pressure vessels, dissimilar metal connectors are generally connected with bolts under ultra-cold conditions. However, due to the different thermal expansion coefficients of the connecting material and the bolt material, the bolt preload will vary to varying degrees, and there are differences in the thermal deformation of the materials, leading to the introduction of thermal stress, thereby increasing or weakening the axial force of the bolt connection, and ultimately leading to the risk of structural failure.

[0003] Therefore, how to provide a solution to the problem of increase or loss of preload force caused by different thermal expansion coefficients of dissimilar metal connecting bolts under ultra-cold conditions is a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the Invention

[0004] In view of this, in order to solve the above problems, the present invention provides a method, device and related equipment for matching the preload force of a bolt connection structure. The technical solution is as follows:

[0005] A method for matching the assembly preload of a bolt connection structure, the matching method comprising:

[0006] Obtain the assembly preload and axial allowable stress of the bolted connection structure at room temperature;

[0007] Performing a thermal-mechanical coupling simulation analysis on the bolt connection structure to obtain the axial force of the bolt connection structure under ultra-cold conditions;

[0008] Calculating a change in the assembly preload under the ultra-cryogenic condition based on the axial force and the assembly preload;

[0009] The assembly preload force is matched and corrected based on the absolute value of the change in the assembly preload force and the axial allowable stress.

[0010] Preferably, in the above-mentioned method for matching the assembly preload of a bolt connection structure, performing matching correction on the assembly preload based on the absolute value of the change value of the assembly preload and the axial allowable stress includes:

[0011] Calculating the ratio of the absolute value of the change in the assembly preload force to the axial allowable stress;

[0012] When the ratio is greater than a first threshold value and less than a second threshold value, the sum of the absolute value of the change value of the assembly preload and the assembly preload is used as the target assembly preload after matching correction.

[0013] Preferably, in the above method for matching the assembly pre-tightening force of the bolt connection structure, the matching and correcting of the assembly pre-tightening force based on the absolute value of the change value of the assembly pre-tightening force and the axial allowable stress further includes:

[0014] When the ratio is greater than or equal to the second threshold, select a bolt gasket with a first coefficient of thermal expansion to perform matching and correction on the assembly pre-tightening force;

[0015] Wherein, the coefficient of thermal expansion of the connected part connected by the bolt connection structure is the second coefficient of thermal expansion, and the ratio of the absolute value of the difference between the first coefficient of thermal expansion and the second coefficient of thermal expansion to the first coefficient of thermal expansion is less than 20%, and the ratio of the absolute value of the difference between the first coefficient of thermal expansion and the second coefficient of thermal expansion to the second coefficient of thermal expansion is less than 20%.

[0016] Preferably, in the above method for matching the assembly pre-tightening force of the bolt connection structure, the matching method further includes:

[0017] Based on the matching and correction result, re-perform thermo-mechanical coupling simulation analysis on the bolt connection structure until the ratio is less than the first threshold.

[0018] The present application also provides a device for matching the assembly pre-tightening force of a bolt connection structure, and the matching device includes:

[0019] An acquisition module, configured to acquire the assembly pre-tightening force and the axial allowable stress of the bolt connection structure at room temperature;

[0020] A simulation module, configured to perform thermo-mechanical coupling simulation analysis on the bolt connection structure to obtain the axial force of the bolt connection structure under cryogenic conditions;

[0021] A calculation module, configured to calculate the change value of the assembly pre-tightening force under the cryogenic conditions based on the axial force and the assembly pre-tightening force;

[0022] A matching module, configured to perform matching and correction on the assembly pre-tightening force based on the absolute value of the change value of the assembly pre-tightening force and the axial allowable stress.

[0023] Preferably, in the above device for matching the assembly pre-tightening force of the bolt connection structure, the matching module includes:

[0024] A calculation unit, configured to calculate the ratio of the absolute value of the change value of the assembly pre-tightening force to the axial allowable stress;

[0025] The first matching unit is configured to, when the ratio is greater than the first threshold and less than the second threshold, use the sum of the absolute value of the change value of the assembly pre-tightening force and the assembly pre-tightening force as the target assembly pre-tightening force after matching and correction.

[0026] Preferably, in the above-mentioned matching device for the assembly pre-tightening force of the bolt connection structure, the matching module further includes:

[0027] The second matching unit is configured to, when the ratio is greater than or equal to the second threshold, select a bolt gasket with a first thermal expansion coefficient to perform matching and correction on the assembly pre-tightening force;

[0028] Wherein, the thermal expansion coefficient of the connected component connected by the bolt connection structure is a second thermal expansion coefficient, and the ratio of the absolute value of the difference between the first thermal expansion coefficient and the second thermal expansion coefficient to the first thermal expansion coefficient is less than 20%, and the ratio of the absolute value of the difference between the first thermal expansion coefficient and the second thermal expansion coefficient to the second thermal expansion coefficient is less than 20%.

[0029] Preferably, in the above-mentioned matching device for the assembly pre-tightening force of the bolt connection structure, the matching device further includes:

[0030] The return module is configured to, based on the matching and correction result, trigger the simulation module to re-perform thermal-structural coupling simulation analysis on the bolt connection structure until the ratio is less than the first threshold.

[0031] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored, and the computer-executable instructions are used to execute the matching method described in any one of the above.

[0032] The present application also provides an electronic device, the electronic device includes: at least one processor, and at least one memory, a bus connected to the processor;

[0033] Wherein, the processor and the memory complete communication with each other through the bus;

[0034] The processor is configured to call program instructions in the memory to execute the matching method described in any one of the above.

[0035] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0036] A method for matching the assembly pre-tightening force of a bolt connection structure provided by the present invention includes: obtaining the assembly pre-tightening force and the axial allowable stress of the bolt connection structure at room temperature; performing a thermo-mechanical coupling simulation analysis on the bolt connection structure to obtain the axial force of the bolt connection structure under cryogenic conditions; calculating the change value of the assembly pre-tightening force under cryogenic conditions based on the axial force and the assembly pre-tightening force; and performing matching correction on the assembly pre-tightening force based on the absolute value of the change value of the assembly pre-tightening force and the axial allowable stress. This matching method provides a solution to the problem of the increase or loss of the pre-tightening force caused by different thermal expansion coefficients of dissimilar metal connecting bolts under cryogenic conditions based on thermo-mechanical coupling simulation, ensuring the reliability of the structure under cryogenic conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0038] Figure 1 It is a schematic flowchart of a method for matching the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention;

[0039] Figure 2 It is a schematic flowchart of another method for matching the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention;

[0040] Figure 3 It is a schematic flowchart of yet another method for matching the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention;

[0041] Figure 4 It is a schematic flowchart of yet another method for matching the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention;

[0042] Figure 5 It is a schematic diagram of the principle structure of a device for matching the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention;

[0043] Figure 6 It is a schematic diagram of the principle structure of another device for matching the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention;

[0044] Figure 7 It is a schematic diagram of the principle structure of yet another device for matching the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention;

[0045] Figure 8Schematic diagram of the principle structure of another matching device for the assembly pre-tightening force of the bolt connection structure provided by the embodiment of the present invention;

[0046] Figure 9 Schematic diagram of the hardware architecture of an electronic device provided by the embodiment of the present invention. Detailed implementation manners

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] Here, the terms appearing in the text are explained:

[0049] Ultra-cold: The general operating temperature is below -180°C, about -200°C, and a liquid nitrogen device is used for refrigeration.

[0050] Pre-tightening force: The pre-tightening force is a relatively common term in the fields of machinery and construction. A more general and general description is that in a connection (regardless of the connection method and use, that is, the connection methods and uses are diverse), before being subjected to the working load, in order to enhance the reliability and tightness of the connection and prevent gaps or relative slippage between the connecting parts after being subjected to the working load, a force is applied in advance.

[0051] Axial force: The axial force of the bolt is the force perpendicular to the cross-section of the shaft. The force is divided into axial force and transverse force, and the axial force is the force whose direction is consistent with the axis of the bolt.

[0052] Coefficient of thermal expansion: An object has a coefficient of expansion and contraction due to temperature change. Its change ability is represented by the change in the length value caused by a unit temperature change under constant pressure, that is, the coefficient of thermal expansion; it should be noted that the coefficients of thermal expansion of various objects are different, and the unit of the coefficient of thermal expansion of general metals is 1 / degree (Celsius).

[0053] Thermo-mechanical coupling: The thermo-mechanical coupling process is a process of mutual influence between two physical fields, namely the stress field and the temperature field, that is, temperature affects the stress and deformation, and at the same time, the stress and deformation also affect the temperature change.

[0054] Based on the technical problems mentioned in the background art, the present application provides a method, device and related equipment for matching the assembly pre-tightening force of a bolt connection structure, providing a solution to the problem of the increase or loss of the pre-tightening force caused by different coefficients of thermal expansion of dissimilar metals in the bolt connection under ultra-deep cold conditions, and ensuring the reliability of the structure under ultra-cold conditions.

[0055] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] Reference Figure 1 , Figure 1 is a schematic flowchart of a method for matching the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention. The method for matching the assembly pre-tightening force of the bolt connection structure includes:

[0057] S101: Obtain the assembly pre-tightening force and axial allowable stress of the bolt connection structure at room temperature.

[0058] Specifically, in this step, it includes but is not limited to obtaining the assembly pre-tightening force and axial allowable stress of all bolt connections in the bolt connection structure at room temperature by looking up the table in the mechanical manual according to the connection form of the bolt connection structure. For example, when the bolt material is 304 stainless steel, the bolt diameter is M5*10, and the bolt strength grade is A2-70, the corresponding assembly pre-tightening force Fp is 5050N and the axial allowable stress is 6733N.

[0059] S102: Conduct a thermo-mechanical coupling simulation analysis on the bolt connection structure to obtain the axial force of the bolt connection structure under cryogenic conditions.

[0060] Specifically, in this step, determine the working temperature range of the bolt connection structure under cryogenic conditions, and conduct a thermo-mechanical coupling simulation analysis on the bolt connection structure loaded with the assembly pre-tightening force obtained by looking up the table at room temperature in step S101 based on the thermo-mechanical coupling simulation method to extract the axial force of the bolt connection structure under cryogenic conditions. For example, the working temperature range of the bolt connection structure under cryogenic conditions is 20K, the loading ambient temperature is 298K, the assembly pre-tightening force obtained by looking up the table at room temperature in step S101 is 5050N based on the thermo-mechanical coupling simulation method, the mechanical boundary conditions are loaded (such as mechanical boundary conditions for restraining the assembly pre-tightening force, etc.), and the parameters of the connected parts (such as the cavity made of aluminum alloy material, density, Young's modulus, and Poisson's ratio, etc. of the connected parts), and conduct a thermo-mechanical coupling simulation analysis on the bolt connection structure to obtain the axial force Fd = 3186 of the bolt connection structure under cryogenic conditions.

[0061] S103: Calculate the change value of the assembly pre-tightening force under the cryogenic conditions based on the axial force and the assembly pre-tightening force.

[0062] Specifically, in this step, based on the assembly pre-tightening force obtained in step S101 and the axial force obtained in step S102, the change value of the assembly pre-tightening force under the ultra-deep cryogenic condition can be calculated according to the formulas of the axial force and the assembly pre-tightening force, that is, the increased or lost value of the assembly pre-tightening force under the ultra-deep cryogenic condition is calculated. For example, in the case of Fp = 5050N and Fd = 3186N, the assembly pre-tightening force under the ultra-deep cryogenic condition loses 1864N, which is recorded as -1864N.

[0063] S104: Match and correct the assembly pre-tightening force based on the absolute value of the change value of the assembly pre-tightening force and the axial allowable stress.

[0064] Specifically, in this step, refer to Figure 2 , Figure 2 FIG. [0000145] is a schematic flowchart of another method for matching the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention. In step S104, the matching and correction of the assembly pre-tightening force based on the absolute value of the change value of the assembly pre-tightening force and the axial allowable stress includes:

[0065] S1041: Calculate the ratio of the absolute value of the change value of the assembly pre-tightening force to the axial allowable stress.

[0066] S1042: When the ratio is greater than the first threshold and less than the second threshold, the sum of the absolute value of the change value of the assembly pre-tightening force and the assembly pre-tightening force is used as the target assembly pre-tightening force after matching and correction.

[0067] For example, when the ratio is greater than 10% and less than 50%, it is necessary to match and correct the assembly pre-tightening force obtained at room temperature according to the increased or lost value of the assembly pre-tightening force under the ultra-deep cryogenic condition. In this example, the target assembly pre-tightening force after matching and correcting the assembly pre-tightening force is Fp + 1864N = 6914N.

[0068] Furthermore, refer to Figure 3 , Figure 3 FIG. [0000155] is a schematic flowchart of yet another method for matching the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention. In step S104, the matching and correction of the assembly pre-tightening force based on the absolute value of the change value of the assembly pre-tightening force and the axial allowable stress further includes:

[0069] S1043: When the ratio is greater than or equal to the second threshold, select a bolt gasket with a first coefficient of thermal expansion to match and correct the assembly pre-tightening force.

[0070] Among them, the coefficient of thermal expansion of the connected parts connected by the bolt connection structure is the second coefficient of thermal expansion. The ratio of the absolute value of the difference between the first coefficient of thermal expansion and the second coefficient of thermal expansion to the first coefficient of thermal expansion is less than 20%, and the ratio of the absolute value of the difference between the first coefficient of thermal expansion and the second coefficient of thermal expansion to the second coefficient of thermal expansion is less than 20%.

[0071] For example, when the ratio is greater than or equal to 50%, it is necessary to select a bolt gasket with a similar coefficient of thermal expansion according to the coefficient of thermal expansion of the connected parts for matching correction. That is to say, if the ratio of the difference between the coefficient of thermal expansion of the connected parts and the selected bolt gasket to any one of the coefficients of thermal expansion of the two is less than 20%, it is considered that the coefficients of thermal expansion of the two are similar.

[0072] Furthermore, as Figure 3 shown, in step S104, the matching correction of the assembly pre-tightening force based on the absolute value of the change value of the assembly pre-tightening force and the axial allowable stress further includes:

[0073] S1044: When the ratio is less than or equal to the first threshold, there is no need to perform matching correction on the assembly pre-tightening force of the bolt connection structure.

[0074] Optionally, in another embodiment of the present invention, referring to Figure 4 , Figure 4 is a schematic flow chart of another method for matching the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention. The method for matching the assembly pre-tightening force of the bolt connection structure further includes:

[0075] S105: Based on the matching correction result, re-perform thermo-mechanical coupling simulation analysis on the bolt connection structure until the ratio is less than the first threshold.

[0076] Specifically, in this step, the bolt connection structure after matching correction of the material (bolt gasket) or the assembly pre-tightening force (increased or lost assembly pre-tightening force) is re-performed thermo-mechanical coupling simulation analysis of the bolt connection structure under ultra-deep cryogenic conditions. Compare the ratio of the absolute value of the increase or loss of the assembly pre-tightening force under ultra-deep cryogenic conditions to the axial allowable stress of the bolt connection structure. If the ratio is less than or equal to 10%, the requirement is met. If the ratio is greater than 10%, step S104 is executed to re-perform matching correction.

[0077] As can be seen from the above description, the method for matching the assembly pre-tightening force of the bolt connection structure provides a solution to the problem of increase or loss of pre-tightening force caused by different coefficients of thermal expansion of dissimilar metal connecting bolts under ultra-deep cryogenic conditions based on thermo-mechanical coupling simulation, ensuring the reliability of the structure under ultra-sonic cold conditions.

[0078] Optionally, based on the above embodiments of the present invention, in another embodiment of the present invention, a matching device for the assembly pre-tightening force of a bolt connection structure is further provided. Refer to Figure 5 , Figure 5 FIG. Figure 5 is a schematic diagram of the principle structure of a matching device for the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention. The matching device for the assembly pre-tightening force of the bolt connection structure includes:

[0079] An acquisition module 11, configured to acquire the assembly pre-tightening force and the axial allowable stress of the bolt connection structure at normal temperature.

[0080] A simulation module 12, configured to perform a thermo-mechanical coupling simulation analysis on the bolt connection structure to obtain the axial force of the bolt connection structure under ultra-deep cryogenic conditions.

[0081] A calculation module 13, configured to calculate the change value of the assembly pre-tightening force under the ultra-deep cryogenic conditions based on the axial force and the assembly pre-tightening force.

[0082] A matching module 14, configured to perform matching correction on the assembly pre-tightening force based on the absolute value of the change value of the assembly pre-tightening force and the axial allowable stress.

[0083] Optionally, in another embodiment of the present invention, refer to Figure 6 , Figure 6 FIG. Figure 6 is a schematic diagram of the principle structure of another matching device for the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention. The matching module 14 includes:

[0084] A calculation unit 141, configured to calculate the ratio of the absolute value of the change value of the assembly pre-tightening force to the axial allowable stress.

[0085] A first matching unit 142, configured to use the sum of the absolute value of the change value of the assembly pre-tightening force and the assembly pre-tightening force as the target assembly pre-tightening force after matching correction when the ratio is greater than a first threshold and less than a second threshold.

[0086] Optionally, in another embodiment of the present invention, refer to Figure 7 , Figure 7 FIG. Figure 7 is a schematic diagram of the principle structure of yet another matching device for the assembly pre-tightening force of a bolt connection structure provided by an embodiment of the present invention. The matching module 14 further includes:

[0087] A second matching unit 143, configured to select a bolt gasket with a first coefficient of thermal expansion to perform matching correction on the assembly pre-tightening force when the ratio is greater than or equal to the second threshold.

[0088] Wherein, the coefficient of thermal expansion of the connected member connected by the bolt connection structure is the second coefficient of thermal expansion, and the ratio of the absolute value of the difference between the first coefficient of thermal expansion and the second coefficient of thermal expansion to the first coefficient of thermal expansion is less than 20%, and the ratio of the absolute value of the difference between the first coefficient of thermal expansion and the second coefficient of thermal expansion to the second coefficient of thermal expansion is less than 20%.

[0089] Optionally, in another embodiment of the present invention, referring to FIG. 8 Figure 8 is a schematic structural diagram of the principle of another matching device for the assembly pre-tightening force of the bolt connection structure provided by the embodiment of the present invention. The matching device for the assembly pre-tightening force of the bolt connection structure includes:

[0090] A return module 15, configured to trigger the simulation module to re-perform thermo-mechanical coupling simulation analysis on the bolt connection structure based on the matching correction result until the ratio is less than the first threshold value.

[0091] It should be noted that the principle of the matching device for the assembly pre-tightening force of the bolt connection structure provided by the embodiment of the present invention is the same as the principle of the matching method for the assembly pre-tightening force of the bolt connection structure provided by the above embodiment of the present invention, and will not be described in detail here.

[0092] Optionally, in another embodiment of the present invention, a computer-readable storage medium is further provided. The computer-readable storage medium stores computer-executable instructions for executing the matching method described in the above embodiment.

[0093] Optionally, in another embodiment of the present invention, an electronic device is further provided. Refer to Figure 9 , Figure 9 is a schematic hardware architecture diagram of an electronic device provided by an embodiment of the present invention.

[0094] The electronic device includes: at least one processor 21, and at least one memory 22 and a bus 23 connected to the processor 21.

[0095] Wherein, the processor 21 and the memory 22 communicate with each other through the bus 23.

[0096] The processor 21 is configured to call program instructions in the memory 22 to execute the matching method described in the above embodiment.

[0097] The above has introduced in detail a method, device and related equipment for matching the assembly pre-tightening force of a bolt connection structure. In this article, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

[0098] It should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0099] It should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes the elements inherent to these, or also includes elements inherent to these process, method, article or device. Without more limitations, the element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0100] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A matching method for the assembly pre-tightening force of a bolt connection structure, characterized in that The matching method includes: Obtaining the assembly pre-tightening force and the axial allowable stress of the bolt connection structure at normal temperature; Performing thermo-mechanical coupling simulation analysis on the bolt connection structure to obtain the axial force of the bolt connection structure under ultra-deep cryogenic conditions; Calculating the change value of the assembly pre-tightening force under the ultra-deep cryogenic conditions based on the axial force and the assembly pre-tightening force; Performing matching correction on the assembly pre-tightening force based on the absolute value of the change value of the assembly pre-tightening force and the axial allowable stress, including: Calculating the ratio of the absolute value of the change value of the assembly pre-tightening force to the axial allowable stress; When the ratio is greater than the first threshold and less than the second threshold, taking the sum of the absolute value of the change value of the assembly pre-tightening force and the assembly pre-tightening force as the target assembly pre-tightening force after matching correction; When the ratio is greater than or equal to the second threshold, selecting a bolt gasket with a first coefficient of thermal expansion to perform matching correction on the assembly pre-tightening force; wherein, the coefficient of thermal expansion of the connected part connected by the bolt connection structure is a second coefficient of thermal expansion, and the ratio of the absolute value of the difference between the first coefficient of thermal expansion and the second coefficient of thermal expansion to the first coefficient of thermal expansion is less than 20%, and the ratio of the absolute value of the difference between the first coefficient of thermal expansion and the second coefficient of thermal expansion to the second coefficient of thermal expansion is less than 20%.

2. The matching method according to claim 1, wherein The matching method further includes: Based on the matching correction result, re-performing thermo-mechanical coupling simulation analysis on the bolt connection structure until the ratio is less than the first threshold.

3. A matching device for the assembly pre-tightening force of a bolt connection structure, characterized in that, The matching device includes: An obtaining module for obtaining the assembly pre-tightening force and the axial allowable stress of the bolt connection structure at normal temperature; A simulation module for performing thermo-mechanical coupling simulation analysis on the bolt connection structure to obtain the axial force of the bolt connection structure under ultra-deep cryogenic conditions; A calculation module for calculating the change value of the assembly pre-tightening force under the ultra-deep cryogenic conditions based on the axial force and the assembly pre-tightening force; A matching module for performing matching correction on the assembly pre-tightening force based on the absolute value of the change value of the assembly pre-tightening force and the axial allowable stress; The matching module includes: A calculation unit for calculating the ratio of the absolute value of the change value of the assembly pre-tightening force to the axial allowable stress; A first matching unit for, when the ratio is greater than the first threshold and less than the second threshold, taking the sum of the absolute value of the change value of the assembly pre-tightening force and the assembly pre-tightening force as the target assembly pre-tightening force after matching correction; A second matching unit for, when the ratio is greater than or equal to the second threshold, selecting a bolt gasket with a first coefficient of thermal expansion to perform matching correction on the assembly pre-tightening force; wherein, the coefficient of thermal expansion of the connected part connected by the bolt connection structure is a second coefficient of thermal expansion, and the ratio of the absolute value of the difference between the first coefficient of thermal expansion and the second coefficient of thermal expansion to the first coefficient of thermal expansion is less than 20%, and the ratio of the absolute value of the difference between the first coefficient of thermal expansion and the second coefficient of thermal expansion to the second coefficient of thermal expansion is less than 20%.

4. The matching device according to claim 3, characterized in that, The matching device further includes: A return module, configured to trigger the simulation module to perform a thermal-structural coupling simulation analysis on the bolt connection structure again based on the matching correction result until the ratio is less than the first threshold.

5. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for executing the matching method according to any one of claims 1-2.

6. An electronic device, characterized in that, The electronic device includes: at least one processor, at least one memory connected to the processor, and a bus; Wherein, the processor and the memory complete communication with each other through the bus; The processor is configured to call program instructions in the memory to execute the matching method according to any one of claims 1-2.

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