Bolt coupling kit

Abstract

The utility model relates to the technical field of bolt connection, and provides a bolt connection suite which comprises a bolt, a bolt head, a bolt rod and a nut, the bolt is in threaded connection with the penetrating-out end of the bolt rod, and a clamped piece is arranged between the nut and the bolt head in a clamped mode. The gasket assembly is sleeved with the tightening latch; wherein the gasket assembly comprises at least two gaskets which are in interference fit, and in the fastening process of the bolt coupling kit to a clamped piece, sliding friction force between the gaskets is converted into pretightening force in the axial direction of the tightening latch. According to the utility model, the gasket assembly formed by the interference fit of the plurality of gaskets is arranged between the nut or the bolt head and the clamped piece, the pre-tightening force required by the clamped piece is determined, the matching parameter between the gaskets is determined according to the pre-tightening force value, the matching parameter is converted into the friction force between the gaskets, and the bolt head or the nut is screwed to enable the gaskets to slide; the sliding friction force after the gasket moves to the second position is equal to the pre-tightening force, and therefore accurate control over the pre-tightening force of the bolt is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt coupling technical field especially relates to a bolt coupling kit. BACKGROUND

[0002] The existing bolt coupling needs to be pre-tightened to produce pre-tightening force when pre-tightening the bolt or nut.

[0003] When actually pre-tightening the bolt, the pre-tightening force is not directly applied, but is applied to the bolt head or nut through pre-tightening torque M A to indirectly produce the required pre-tightening force value F M , as shown in the following formula: Figure 1

[0004]

[0005] According to the calculation formula of torque M A , the size of M A directly depends on the friction coefficient μ K between the bolt head or nut end face and the clamped part and the friction coefficient μ G between the bolt-nut threaded pair, as shown in the following formula:

[0006] The existing technology mainly adopts three methods to pre-tighten the bolt.

[0007] The first method is torque pre-tightening, that is, the required pre-tightening force F M is produced by applying torque M A to the bolt head or nut; when this method is adopted, the friction coefficient μ K between the bolt head or nut end face and the clamped part has a large dispersion, and the difference between the maximum value and the minimum value is large. Similarly, the friction coefficient μ G between the bolt-nut threaded pair also has a large dispersion, and the difference between the maximum value and the minimum value is also large; thus, the same pre-tightening torque M A is applied, but the dispersion of the actual axial force F M of the bolt is large, and there is uncertainty. Moreover, this method is affected by the precision of the tightening tool itself, the reading error of the operator, etc., so that the pre-tightening force of the bolt cannot be accurately controlled, and the error is very large.

[0008] The second method is angle pre-tightening, that is, the bolt head or nut is rotated to pre-tighten, but the torque value M A of the bolt is not monitored, only the rotation angle of the bolt head or nut during pre-tightening is monitored, and the pre-tightening force F M of the bolt is converted according to the rotation angle required by the torque of the bolt head or nut end face.When this method is used, due to the need for expensive and complex special equipment, it can only be used in a small range in fixed places and limited products, and cannot be widely applied; and this method is also affected by the dispersion of equipment precision, bolt material, etc., and the dispersion of the actual bolt obtained pre-tightening force is also large.

[0009] The third is the yield point control method pre-tightening, which pre-tightens by rotating the bolt head or nut, but only focuses on whether the angle of the bolt rotation and the applied torque are linearly related, if not, it means that the bolt has yielded, at this time, since the yield point of the bolt is fixed, the axial force, i.e. the pre-tightening force, converted to the bolt is also fixed. Although the yield point control method avoids the dispersion of the friction coefficient, it is still affected by the dispersion of the bolt material, the measurement error of the equipment, the reading error of the operator, etc., and the dispersion of the actual bolt obtained pre-tightening force is still large.

[0010] The accuracy of the pre-tightening force of the bolt has a decisive effect on the safety of the bolt and the reliability of the clamped part. The large dispersion of the bolt pre-tightening force means that the tensile force error of the bolt in the working state is large. Therefore, the safety factor obtained by theoretical calculation cannot be guaranteed, and the possibility of failure such as yield and fracture of the bolt is large, especially in high-precision fields, a broken bolt may cause a disaster.

[0011] Therefore, it is very important and necessary to accurately apply pre-tightening force to the bolt. Practical new type content

[0012] The utility model provides a kind of bolt coupling kit to solve the technical problems such as the pre-tightening force of bolt difficult to accurately control.

[0013] The utility model provides a kind of bolt coupling kit, comprising:

[0014] Bolt, including head and shank,

[0015] Nut, with the shank end of screw connection, the nut and the head between clamping are clamped part;

[0016] Gasket assembly, with the shank sleeve connection;

[0017] Wherein, the gasket assembly includes at least two interference fit gaskets, in the fastening process of bolt coupling kit to the clamped part, the sliding friction between the gaskets is converted into pre-tightening force along the shank axial direction.

[0018] According to the bolt coupling kit provided by the utility model,

[0019] One side of the gasket assembly is in abutment with the clamped part, and the other side of the gasket assembly is in abutment with the head or the nut.

[0020] According to the bolt coupling kit, the gasket assembly comprises:

[0021] The first gasket is sleeved with the bolt rod;

[0022] The second gasket is sleeved with the first gasket;

[0023] The first gasket and the second gasket are annular structures, and the outer ring surface of the first gasket is at least partially interference-fitted with the inner ring surface of the second gasket.

[0024] According to the bolt coupling kit, comprising:

[0025] The support plate is circumferentially arranged on the side of the first gasket facing the clamped part, and the side of the support plate away from the first gasket abuts against the clamped part.

[0026] According to the bolt coupling kit,

[0027] The support plate is continuously arranged or spacedly arranged on the first gasket.

[0028] According to the bolt coupling kit,

[0029] The inner ring surface of the first gasket exceeds the side of the support plate away from the bolt rod.

[0030] According to the bolt coupling kit,

[0031] At least part of the side of the nut or the bolt head facing the clamped part abuts against the side of the second gasket away from the clamped part, so that the second gasket is pressed to be relatively displaced with the first gasket along the axial direction of the bolt rod.

[0032] According to the bolt coupling kit, comprising:

[0033] The limiting plate is circumferentially arranged on the inner ring surface of the second gasket, and the side of the limiting plate away from the second gasket extends to the bolt rod.

[0034] According to the bolt coupling kit,

[0035] The length of the inner ring surface of the second gasket along the axial direction of the bolt rod is greater than the length of the outer ring surface of the first gasket along the axial direction of the bolt rod.

[0036] According to the bolt coupling kit,

[0037] The side of the nut or the head of the bolt facing the clamped part is in abutment with the side of the first washer facing away from the clamped part, and the nut or the head of the bolt is arranged separately from the second washer, so as to facilitate pressing the first washer to cause the first washer to be relatively displaced with the second washer along the axial direction of the shank of the bolt.

[0038] The nut or the head of the bolt is arranged separately from the second washer, so as to facilitate pressing the first washer to cause the first washer to be relatively displaced with the second washer along the axial direction of the shank of the bolt. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] Figure 1 is a schematic diagram of the prior art;

[0041] Figure 2 is a schematic diagram of embodiment 1 of the present application;

[0042] Figure 3 is a schematic diagram of embodiment 2 of the present application.

[0043] Reference signs:

[0044] 1, clamped part;

[0045] 2, bolt; 21, head of bolt; 22, shank of bolt;

[0046] 3, nut;

[0047] 41, first washer; 42, second washer; 43, support plate; 44, limiting plate. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0049] The utility model discloses a bolt coupling kit. Figures 2-3 The utility model discloses a bolt coupling kit.

[0050] Figure 2 It is the schematic diagram of the utility model embodiment 1, Figure 3 It is the schematic diagram of the utility model embodiment 2, as shown in the figure, Figure 2 And Figure 3 The utility model discloses a bolt coupling kit, including bolt 2, nut 3 and washer assembly,

[0051] Bolt 2 includes the head 21 of bolt and the shank 22 of bolt,

[0052] Nut 3 is connected with the shank 22 of bolt and is screwed out, and the head 21 of bolt and nut 3 are clamped with the clamped piece 1,

[0053] Washer assembly, with the shank 22 of bolt sleeve,

[0054] Among them, washer assembly includes at least two interference fit washers, and the sliding friction between the washer is converted into the pre-tightening force along the shank 22 of bolt in the fastening process of bolt coupling kit to the clamped piece 1.

[0055] According to the bolt coupling kit provided by the utility model embodiment, one side of washer assembly is in abutment with the clamped piece 1, and the other side of washer assembly is in abutment with the head 21 of bolt or nut 3, that is to say, washer assembly can be arranged between the head 21 of bolt and the clamped piece 1, or can be arranged between nut 3 and the clamped piece 1,

[0056] It should be understood that no matter washer assembly is arranged between the head 21 of bolt and the clamped piece 1 or is arranged between nut 3 and the clamped piece 1, it can normally play a role, and for washer assembly, only the installation position is changed, and the working principle is the same, the installation position of washer assembly depends on which side of the clamped piece 1 is more convenient for the implementation of fastening operation, since washer assembly has a certain thickness, therefore, if the space on the nut 3 side of the clamped piece 1 is small, washer assembly can be installed to the head 21 side, and vice versa.

[0057] It should be understood that the washer can be two or more than two, as long as the interference fit between the washers is met, and the number is not limited, at the same time, the matching surface between the washers can be a cylindrical surface, or a conical surface or other shaped surface, as long as the interference fit between the washers can be realized through the matching surface, and the binding force between the washers can be controlled through the matching parameters between the washers.

[0058] According to the bolt coupling kit provided by the utility model embodiment, the washer assembly includes:

[0059] The first gasket 41 is sleeved with the bolt rod 22;

[0060] The second gasket 42 is sleeved with the first gasket 41;

[0061] The first gasket 41 and the second gasket 42 are both annular structures, and the outer ring surface of the first gasket 41 is at least partially interference-fitted with the inner ring surface of the second gasket 42.

[0062] In possible embodiments, the first gasket 41 and the second gasket 42 can be circular rings or polygonal rings, which are not limited herein, as long as they can be sleeved with the bolt rod 22 and interference-fitted between the first gasket 41 and the second gasket 42.

[0063] As shown in FIG. 1, the bolt coupling assembly provided by the embodiment 1 of the utility model comprises: Figure 2

[0064] According to the bolt coupling assembly provided by the embodiment 1 of the utility model, the first gasket 41 is sleeved with the bolt rod 22, and the second gasket 42 is sleeved with the first gasket 41.

[0065] The support plate 43 is circumferentially arranged on the side of the first gasket 41 facing the clamped member 1, and the side of the support plate 43 away from the first gasket 41 abuts against the clamped member 1.

[0066] In possible embodiments, the side of the support plate 43 away from the bolt rod 22 is not more than the outer ring surface of the first gasket 41, so as to avoid contact with the inner ring surface of the second gasket 42 and affect the control accuracy of the pre-tightening force.

[0067] It should be understood that the support plate 43 is used to support the first gasket 41, so that there is a certain distance between the outer ring surface of the first gasket 41 and the clamped member 1, thereby more facilitating the cooperation of the entire outer ring surface of the first gasket 41 with the inner ring surface of the second gasket 42; therefore, in the present embodiment, the length of the outer ring surface of the first gasket 41 along the axial direction of the bolt rod 22 is preferably less than the length of the inner ring surface of the second gasket 42 along the axial direction of the bolt rod 22.

[0068] Further, in the present embodiment, the length of the outer ring surface of the first gasket 41 along the axial direction of the bolt rod 22 can also be greater than the length of the inner ring surface of the second gasket 42 along the axial direction of the bolt rod 22, in which case the support plate 43 is not required; this is because when the bolt rod 22 or the nut 3 moves the second gasket 42, the bolt rod 22 or the nut 3 is once contacted with the first gasket 41 and is limited to continue to move, and at this time the outer ring surface of the first gasket 41 is in contact with the entire inner ring surface of the second gasket 42, at which time the pre-tightening force is in a state of infinitely approaching the required pre-tightening force value, although there is a certain error, but in some scenarios of accuracy requirements, it can also meet the use requirements.

[0069] ​According to the bolt coupling kit provided in the embodiment 1 of the utility model, the support plates 43 are continuously arranged or arranged at intervals on the first gasket 41.

[0070] It should be understood that how the support plates 43 are arranged on the first gasket 41 depends on the use scene and requirement; if the pre-tightening force of the clamped part 1 at the place is required to be higher, at this time, the first gasket 41 needs to bear greater pressure, the support plates 43 are preferably continuously arranged, the continuity of the continuous arrangement is good, the integrated structure has high strength, the stress is uniform, and better stability is obtained; if the pre-tightening force of the clamped part 1 at the place is required to be lower, the support plates 43 can be arranged at intervals, so that the normal stress requirement is met, and the material can be saved and the weight of the part is reduced, and better economy is obtained.

[0071] According to the bolt coupling kit provided in the embodiment 1 of the utility model, at least part of the nut 3 or the head 21 on the side facing the clamped part 1 abuts against the side of the second gasket 42 facing away from the clamped part 1.

[0072] It should be understood that in the embodiment, the outer diameters of the nut 3 or the head 21 abutting against the second gasket 42 are all greater than the outer diameter of the first gasket 41, and the outer diameter of the nut 3 or the head 21 can be greater, which is not limited here.

[0073] As shown in Figure 3 The embodiment 2 provided by the utility model is as follows:

[0074] According to the bolt coupling kit provided in the embodiment 2 of the utility model, the bolt coupling kit comprises:

[0075] The limiting plate 44 is circumferentially arranged on the inner annular surface of the second gasket 42, and the side of the limiting plate 44 away from the second gasket 42 extends to the bolt rod 22.

[0076] It should be understood that the limiting plate 44 is arranged on the inner annular surface of the second gasket 42, so as to limit the position of the first gasket 41 and prevent the first gasket 41 from displacing too much; in the embodiment, the length of the outer annular surface of the first gasket 41 along the axial direction of the bolt rod 22 must be smaller than the length of the inner annular surface of the second gasket 42 along the axial direction of the bolt rod 22, so that the first gasket 41 can be partially sleeved on the second gasket 42 or completely sleeved in the second gasket 42, so as to realize that the outer annular surface of the first gasket 41 is completely attached to the inner annular surface of the second gasket 42, and the precise control of the pre-tightening force is realized through the friction force of the matching surface.

[0077] According to the bolt coupling kit provided in the embodiment 2 of the utility model, the side of the nut 3 or the head 21 facing the clamped part 1 abuts against the side of the first gasket 41 facing away from the clamped part 1, and the nut 3 or the head 21 is separately arranged with the second gasket 42.

[0078] Further, in the present embodiment, the outer diameter of the nut 3 or the head 21 needs to be at least larger than the inner diameter of the first washer 41, and preferably not larger than the outer diameter of the first washer 41, so as to avoid that the nut 3 or the head 21 is interfered by the second washer 42 during movement, thereby failing to further press the first washer 41 into the second washer 42, at this time, the outer ring surface of the first washer 41 is completely attached to the inner ring surface of the second washer 42, at this time, the pre-tightening force is in a state of approaching to the required pre-tightening force value, with a certain error, which can meet the use requirement in some low-precision scenes, but cannot be used in scenes with high precision requirement.

[0079] According to the bolt coupling kit provided in Embodiment 2 of the present application, the limiting plates 44 are continuously arranged or arranged at intervals on the inner ring surface of the second washer 42.

[0080] It should be understood that the limiting plates 44 can be arranged on the inner ring surface of the second washer 42 close to the clamped member 1, or slightly away from the clamped member 1 by a certain distance, and the arrangement position of the limiting plates 44 is determined according to the difference in axial length, i.e. height, of the outer ring surface of the first washer 41 and the inner ring surface of the second washer 42; the limiting plates 44 function to limit the position of the first washer 41 to prevent excessive displacement of the first washer 41, during the process of screwing the head 21 or the nut 3, as long as the first washer 41 does not contact the limiting plates 44, the limiting plates 44 will not be subjected to pressure, even if the first washer 41 contacts the limiting plates 44, the operator will immediately stop the operation when he perceives the obstruction, therefore, the limiting plates 44 do not have high bearing requirement; therefore, the limiting plates 44 can be continuously arranged or arranged at intervals according to the actual situation, and the arrangement at intervals is preferred, which saves materials and reduces the weight of the first washer 41, thereby improving the economy and portability.

[0081] In use of the embodiments of the present application:

[0082] Determine the pre-tightening force value: according to the parameters of the clamped member 1, obtain the required pre-tightening force value of the clamped member 1;

[0083] In possible embodiments, the parameters of the clamped member 1 can include the material, position and stress requirement of the clamped member 1, etc.

[0084] Further, the size of the required pre-tightening force of the bolt coupling is determined by the size, material and structure of the clamped member, the specification and grade of the bolt, the size and position of the external load, etc. The specific calculation formula of the required pre-tightening force includes but is not limited to the following several situations:

[0085] 1) When the external load is a transverse force F Q or a transverse torque M Y , the required bolt clamping force F KQ is:

[0086] .

[0087] 2) When the external load is the internal pressure p of the high-pressure vessel i At that time, the required bolt clamping force F KP for:

[0088] .

[0089] 3) When the external load is an eccentrically acting external force F A or overturning moment M B At this time, the required bolt clamping force is:

[0090] .

[0091] Taking into account other factors, the final required bolt preload value is F. M For F Q M Y p i F A M B The function is determined by these factors and calculated using these forces. To meet the bolt preload requirements, the actual applied preload must be exactly the required value mentioned above; it cannot be too large or too small, and must be precisely equal to F. M .

[0092] Fabricating the washer assembly: Controlling the fit parameters between the washers according to the preload value, and ensuring that multiple washers are interference-fitted to the first position;

[0093] In possible implementations, the mating parameters between washers include dimensions, tolerances, surface roughness, and the coefficient of friction μ. f By precisely calculating and controlling the aforementioned mating parameters between the washer mating surfaces, the critical torque value F required for the mating surfaces to slide along the axis can be obtained. f The torque value F f The required preload F for bolt 2 M The values ​​are the same.

[0094] It should be understood that the connection between the washers is an interference fit. In the first position, the washers are not fully connected and are only initially fixed. The purpose is to connect multiple washers together in advance. The mating surfaces between the washers are not at their maximum, leaving room for the subsequent movement of the nut 3 or the bolt head 21 along the bolt rod 22 to achieve the preset preload.

[0095] Install the washer assembly: Install the washer assembly between the clamped part 1 and the nut 3 or between the clamped part 1 and the bolt head 21;

[0096] Pre-tightening operation: according to the installation position of the gasket assembly, the nut 3 or the head 21 is screwed, the gasket assembly is stressed, the relative displacement between the plurality of gaskets occurs until the switching to the second position, and the pre-tightening is completed.

[0097] It should be understood that when the head 21 or the nut 3 is screwed, the head 21 or the nut 3 pushes the gaskets to move axially along the shank 22 to push the gaskets to move axially along the shank 22; since the sliding friction between the gaskets is fixed for cylindrical surface matching, or not fixed but can be accurately calculated, adjusted, and controlled for conical surface matching.

[0098] Further, as the head 21 or the nut 3 is screwed, the degree of nesting between the gaskets becomes deeper, that is, the matching surface between the gaskets becomes larger, until the matching area between the gaskets reaches the maximum and no longer increases, at which time the relative position between the gaskets is the second position; during the above process, as the interference matching area between the gaskets gradually increases, the sliding friction also gradually increases, and the pre-tightening force also increases, until the matching area between the gaskets reaches the maximum, at which time the sliding friction between the gaskets reaches the peak and no longer increases, and the pre-tightening force value becomes a fixed amount and no longer changes.

[0099] Further, the pre-tightening operation further includes:

[0100] In embodiment 1, the nut 3 or the head 21 is in abutment with the second gasket 42, the second gasket 42 is moved axially along the shank 22 towards the clamped member 1 until the outer ring surface of the first gasket 41 is fully matched with the inner ring surface of the second gasket 42; at this time, since the outer diameter of the head 21 or the nut 3 is larger, it will not be affected by the first gasket 41 or the second gasket 42, and the head 21 or the nut 3 can be screwed.

[0101] In embodiment 2, the nut 3 or the head 21 is in abutment with the first gasket 41, the first gasket 41 is moved axially along the shank 22 towards the clamped member 1 until the outer ring surface of the first gasket 41 is fully matched with the inner ring surface of the second gasket 42; at this time, the outer diameter of the head 21 or the nut 3 is smaller than the inner ring surface diameter of the first gasket 41, and since the first gasket 41 needs to be completely pushed into the second gasket 42, a part of the head 21 or the nut 3 needs to enter the second gasket 42, at which time the component in abutment with the first gasket 41 may be limited, at which time the component in abutment with the clamped member 1 can be screwed, such as the nut 3 in abutment with the first gasket 41, the head 21 can be screwed.

[0102] Further, in possible embodiments, considering that the gasket assembly can be arranged at different positions, at least two operation methods are included in the pre-tightening operation:

[0103] The first, if the gasket assembly is between the nut 3 and the clamped part 1, the bolt head 21 is fixed, the nut 3 is screwed to make the nut 3 abut against the gasket assembly, until the contact surface of the first gasket 41 and the second gasket 42 reaches the maximum, and the nut 3 is stopped.

[0104] The second, if the gasket assembly is between the bolt head 21 and the clamped part 1, the nut 3 is fixed, the bolt head 21 is screwed to make the bolt head 21 abut against the gasket assembly, until the contact surface of the first gasket 41 and the second gasket 42 reaches the maximum, and the bolt head 21 is stopped.

[0105] Further, through the bolt coupling kit and the use method provided by the embodiment of the application, the pre-tightening force of the bolt 2 is only determined by the internal friction coefficient μ of the parts of the device f One value is determined, and the dispersion degree is easy to control. Unlike the traditional torque method pre-tightening, the friction coefficient μ between the end surface of the bolt head 21 or the nut 3 and the clamped part 1 needs to be controlled K And the friction coefficient μ between the bolt 2-nut 3 threaded pair G The two friction coefficients. Therefore, the pre-tightening force of the bolt is more accurate, thereby making the bolt coupling more safe and reliable. Therefore, the bolt coupling kit provided by the embodiment of the application is particularly suitable for scenes with high control requirements for bolt pre-tightening force, such as high-precision fields such as nuclear power, aviation, aerospace, or fields with high safety requirements such as railways and gas.

[0106] Further, compared with the prior art, the bolt coupling kit provided by the embodiment of the application also has the following outstanding advantages:

[0107] First, compared with the torque method, the bolt coupling kit provided by the embodiment of the application can make the bolt obtain more accurate pre-tightening force values without being affected by the error of the tightening tool or the reading error of the operator, thereby improving the safety and reliability of the bolt coupling; simple, convenient and low-cost tools such as ordinary wrenches can be used to replace complex and expensive torque wrenches for tightening. Since the size of the pre-tightening force can be directly determined, compared with the torque wrench that controls the torque, the device provided by the embodiment of the application can achieve more accurate pre-tightening effect than the torque wrench, thereby making the bolt coupling more safe and reliable.

[0108] Second, compared with the angle method, the bolt coupling kit provided by the embodiment of the application has a simple structure, does not require a power supply and monitoring equipment, has a wider application range, and can be applied almost without limitation in any occasion, has strong applicability, is convenient to operate, and has extremely low cost.

[0109] Third, compared with the yield point control method, the bolt coupling kit provided by the embodiment of the application is not affected by the error of the dispersion degree of the strength value of the bolt itself, thereby being able to better control the pre-tightening force and having higher precision and stability.

[0110] The device embodiments described above are merely illustrative, wherein the units illustrated as separate components can or can not be physically separated, and the components illustrated as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A bolted joint kit, characterized in that, The bolt (2) comprises a bolt head (21) and a bolt shank (22), a nut (3) is threadedly connected to the through end of the bolt shank (22), and a clamped member (1) is clamped between the nut (3) and the bolt head (21). The gasket assembly comprises at least two interference-fitted gaskets, and during the fastening of the bolt coupling kit to the clamped member (1), the sliding friction between the gaskets is converted into an axial pre-tightening force along the bolt shank (22).

2. The bolt coupling kit according to claim 1, wherein one side of the gasket assembly is in abutment with the clamped member (1), and the other side of the gasket assembly is in abutment with the bolt head (21) or the nut (3). The gasket assembly comprises a first gasket (41) and a second gasket (42), the first gasket (41) is sleeved on the bolt shank (22), and the second gasket (42) is sleeved on the first gasket (41). The first gasket (41) and the second gasket (42) are both annular structures, and the outer ring surface of the first gasket (41) is at least partially interference-fitted with the inner ring surface of the second gasket (42). The gasket assembly further comprises a support plate (43) which is circumferentially arranged on the side of the first gasket (41) facing the clamped member (1), and the side of the support plate (43) away from the first gasket (41) is in abutment with the clamped member (1).

5. The bolt coupling kit according to claim 4, wherein the support plate (43) is continuously arranged or spacedly arranged on the first gasket (41).

3. The bolted joint kit of claim 2, wherein, 6. The bolt coupling kit according to claim 4, wherein the inner ring surface of the first gasket (41) exceeds the side of the support plate (43) away from the bolt shank (22).

7. The bolt coupling kit according to any one of claims 4-6, wherein at least part of the side of the nut (3) or the bolt head (21) facing the clamped member (1) is in abutment with the side of the second gasket (42) away from the clamped member (1), so as to facilitate the compression of the second gasket (42) and the relative displacement of the second gasket (42) along the axial direction of the bolt shank (22) relative to the first gasket (41). The gasket assembly further comprises a limiting plate (44) which is circumferentially arranged on the inner ring surface of the second gasket (42), and the side of the limiting plate (44) away from the second gasket (42) extends towards the bolt shank (22).

9. The bolt coupling kit according to claim 8, wherein the length of the inner ring surface of the second gasket (42) along the axial direction of the bolt shank (22) is greater than the length of the outer ring surface of the first gasket (41) along the axial direction of the bolt shank (22).

4. The bolted joint kit of claim 3, wherein, 10. The bolt coupling kit according to claim 8 or 9, wherein ​ ​ ​ ​ ​ ​ ​ 8. The bolted joint kit of claim 3, wherein, ​ ​ ​ ​ ​ The nut (3) or the bolt head (21) abuts against one side of the first washer (41) which is away from the clamped part (1), and the nut (3) or the bolt head (21) is arranged separately from the second washer (42), so that the first washer (41) is pressed to generate relative displacement with the second washer (42) along the axial direction of the bolt rod (22).

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