A tray nut assembly

Abstract

A tray nut assembly for fixing a nut side flange and a bolt side flange, comprising: a tray plate, on which several bolt holes are provided; a fixing nut and a fastening nut, the fixing nut and the fastening nut both correspond to the bolt holes one by one, the fixing nut passes through the bolt hole and is fixed to the fixing nut side flange through a first connecting device, and the fastening nut passes through the bolt hole and connects and fixes the fixing nut side flange and the bolt side flange through a second connecting device. By using the tray nut assembly, a single nut can be quickly replaced and installed, and the process does not damage the tray plate, further improving the low material utilization rate and reducing the processing cost.

Description

Technical Field

[0001] This specification relates to the technical field of pallet nut design, and specifically relates to a pallet nut assembly. Background Art

[0002] Due to their complex chamber structures, it is often impossible to connect the flanges of aero-engines and gas turbines using conventional bolts and nuts. In the chamber structures near the combustion chambers of gas turbines, there are often cases where closed chambers have been formed, and at this time, tools such as wrenches cannot enter. To solve the above problems, pallet nut assemblies must be used at the corresponding positions. In the current pallet nuts, several nuts are spaced apart on an annular support plate with a C-shaped cross-section, and their movement is restricted by the bosses formed by punching on both sides of the nuts. The above design mainly has two deficiencies.

[0003] Firstly, the processing cost is high and the technical difficulty is great. When manufacturing the support plate with a C-shaped cross-section, two radial bends must be completed. There is a large stretching rate and compression rate when bending the sheet metal, and this situation is more significant when the overall turning diameter of the support plate is small. Therefore, the forming technology of the support plate is very difficult, and there are high mold costs. Under the existing technology, after the turning radius of the support plate changes, the molds cannot be universal, further increasing the production cost. If the above support plate is produced by machining, there are also problems of low material utilization rate and high processing cost. Secondly, it is somewhat difficult to replace a single nut. During the process of replacing a single nut, the remaining nuts on one side need to be taken out one by one and then slid out from one side of the support plate. During the above process, it is also necessary to bend the stop protrusions on both sides of the nut, which easily damages the stop protrusions. Summary of the Invention

[0004] In view of this, the embodiments of this specification provide a pallet nut assembly, achieving the purpose of quickly replacing nuts, improving material utilization rate, and reducing processing costs.

[0005] The embodiments of this specification provide the following technical solutions:

[0006] A pallet nut assembly for fixing the nut-side flange and the bolt-side flange, comprising:

[0007] A support plate, on which several bolt holes are provided;

[0008] A fixing nut and a fastening nut, both the fixing nut and the fastening nut correspond to the bolt holes one by one. The fixing nut passes through the bolt hole and is fixed to the fixing nut-side flange through a first connecting device, and the fastening nut passes through the bolt hole and connects and fixes the fixing nut-side flange and the bolt-side flange through a second connecting device.

[0009] Further, limiting hooks are provided on the support plate, and the limiting hooks are symmetrically arranged on both sides of each bolt hole facing the long side of the support plate.

[0010] Further, an elastic limiting piece is arranged on the pallet, and the elastic limiting piece is arranged on one side of the short side of the pallet facing each bolt hole.

[0011] Further, a fastening nut stop ear is arranged on the fastening nut. The fastening nut stop ear is axially symmetric with respect to the axis of the fastening nut. The fastening nut is detachably connected to the limiting hook on the pallet through the fastening nut stop ear.

[0012] Further, a fixing nut stop ear is arranged on the fixing nut. The fixing nut stop ear is axially symmetric with respect to the axis of the fixing nut. The fixing nut is detachably connected to the limiting hook on the pallet through the fixing nut stop ear.

[0013] Further, the helix directions of the ears of the fastening nut stop ear and the fixing nut stop ear are opposite.

[0014] Further, the first connecting device includes a countersunk head screw, and the fixing nut is connected to the fixing nut side flange through the countersunk head screw.

[0015] Further, the second connecting device includes a fastening bolt, and the fastening nut connects the fixing nut side flange and the bolt side flange through the fastening bolt.

[0016] Further, the first width of the pallet is L1-1, the second width of the pallet is L1-2, the width of the fastening nut is L2-1, the length of the fastening nut is L2-2, the width of the fixing nut is L3-1, and the length of the fixing nut is L3-2. Among them, both L2-1 and L3-1 are less than L1-1, L1-1>L2-2>L1-2, L1-1>L3-2>L1-2; the diameter of the fastening nut is φ2, L2-2 = φ2>L2-1; the diameter of the fixing nut is φ3, L3-2 = φ3>L3-1.

[0017] Further, the mating surface of the fastening nut seat of the fastening nut and the mating surface of the fixing nut seat of the fixing nut are both rough surfaces.

[0018] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of this specification at least include:

[0019] For the pallet of the pallet nut assembly of the present invention, only conventional cutting and plane bending processes need to be carried out on the plate to form it, without compressing and stretching the plate, and without expensive and complex sheet metal molds, which can effectively reduce production costs; when the nut specifications are similar and the turning radii of the pallets are different, the forming molds of the limiting hook and the elastic hook can be shared, and single nuts can be quickly replaced and installed, and the process will not damage the pallet, further improving the material utilization rate and reducing the processing cost. Description of the Drawings

[0020] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0021] Figure 1 is the overall schematic diagram of the tray nut assembly in the embodiment of the present invention;

[0022] Figure 2 is Figure 1 the enlarged schematic diagram of part Ⅰ of

[0023] Figure 3 is Figure 1 the enlarged schematic diagram of part Ⅱ of

[0024] Figure 4 is Figure 2 the sectional view of D-D;

[0025] Figure 5 is the axial sectional view of the fastening nut in the installation state of the tray nut assembly in the embodiment of the present invention;

[0026] Figure 6 is the axial sectional view of the fixing nut in the installation state of the tray nut assembly in the embodiment of the present invention;

[0027] Figure 7 is the three-dimensional schematic diagram of the tray in the embodiment of the present invention;

[0028] Figure 8 is the three-dimensional schematic diagram of the tray in the embodiment of the present invention;

[0029] Figure 9 is the sectional view of the limit hook of the tray in the embodiment of the present invention;

[0030] Figure 10 is the sectional view of the elastic limit piece of the tray in the embodiment of the present invention;

[0031] Figure 11 is the three-dimensional schematic diagram of the fastening nut in the embodiment of the present invention;

[0032] Figure 12 is the front view of the fastening nut in the embodiment of the present invention;

[0033] Figure 13 is Figure 12 the sectional view of A-A;

[0034] Figure 14 is the three-dimensional schematic diagram of the fixing nut in the embodiment of the present invention;

[0035] Figure 15It is the front view of the fixed nut in the embodiment of the present invention;

[0036] Figure 16 is Figure 15 the sectional view of A-A;

[0037] Figure 17 It is the schematic diagram of the assembly process in the embodiment of the present invention.

[0038] Explanation of reference numerals: 1. Support plate; 101. Limit hook; 102. Elastic limit piece; 2. Tightening nut; 201. Tightening nut stop ear; 202. Tightening nut seat mating surface; 3. Fixed nut; 301. Fixed nut stop ear; 302. Fixed nut seat mating surface; 4. Tightening bolt; 5. Nut side flange; 6. Bolt side flange; 7. Countersunk head screw. Detailed implementation manners

[0039] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0040] The following uses specific specific examples to illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0041] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects described herein can be used to implement the device and / or practice the method. In addition, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0042] It should also be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. The diagrams only show the components related to the present application and are not drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and proportions of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0043] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0044] The following will describe the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.

[0045] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 4 In the tray nut assembly according to the embodiment of the present invention, it mainly includes a tray 1, a fastening nut 2, and a fixing nut 3. The tray 1 is designed according to the internal structure of an aeroengine and a gas turbine chamber. The tray 1 in this embodiment is an annular tray. On the tray 1, a plurality of bolt holes are circumferentially distributed. Both the fastening nut 2 and the fixing nut 3 pass through the bolt holes and are fixed on the tray 1. The function of the fixing nut 3 is to fix the tray 1 on the fixing nut side flange 5, and the function of the fastening nut 2 is to connect the two flanges (the fixing nut side flange 5 and the bolt side flange 6). During the installation process, first, the tray 1 and the fixing nut 3 are fixed on the fixing nut side flange 5 by using the fixing nut 3 and the countersunk head screw 7. After the bolt side flange 6 is assembled to the corresponding position, the fastening bolt 4 and the fastening nut 2 are used to complete the connection between the fixing nut side flange 5 and the bolt side flange 6. Reference Figure 4 The fastening nut 2 is fixed on the tray 1 through the clamping structure on the tray 1.

[0046] As Figure 5 shown, in the cross-section of the fixed connection between the fastening nut 2 and the tray 1, after the fastening nut 2 and the tray 1 are engaged, the fastening between the nut side flange 5 and the bolt side flange 6 is realized through the cooperation of the fastening nut 2 and the fastening bolt 4. Among them, a single fastening nut 2 can be detachably replaced without disassembling the other nuts. As Figure 6 shown, in the cross-section of the fixed connection between the fixing nut 3 and the tray 1, the tray nut assembly is fixed to the nut side flange 5 through the cooperation of the fixing nut 3 and the countersunk head screw 7. During the assembly process, first, the tray nut assembly is fixed to the nut side flange 5 by using the fixing nut 3 and the countersunk head screw 7. At the corresponding position of the nut side flange 5, a countersunk hole is provided. Then, the fastening nut 2 and the fastening bolt 4 are used to realize the fastening between the nut side flange 5 and the bolt side flange 6.

[0047] As Figure 7 、Figure 8 , Figure 9 , Figure 10 As shown in Figure 10 , a limiting hook 101 and an elastic limiting piece 102 are arranged on the pallet 1. The two limiting hooks 101 are symmetrically distributed at the upper and lower ends of the bolt holes on the pallet 1. The limiting hook 101 cooperates with the locking lug 201 on the fastening nut 2 or the locking lug 301 on the fixing nut 3 to detachably fix the fastening nut 2 or the fixing nut 3 on the pallet 1. After two folds, the cross-section of the limiting hook 101 is approximately C-shaped, and the folding of the limiting hook 101 is completed through the plane bending process of the sheet. Specifically, the folding angle of the limiting hook each time is selected to be about 90°. After two folds, the dimension of the limiting hook 101 in the axial direction must be greater than the thickness dimension of the locking lug 201 on the fastening nut 2 or the locking lug 301 on the fixing nut 3. The dimension of the limiting hook 101 in the radial direction must be less than the width dimension of the fastening nut 2 or the fixing nut 3 so that the fastening nut 2 or the fixing nut 3 can be smoothly installed and replaced.

[0048] Next to the limiting hook 101, an elastic limiting piece 102 is arranged. As Figure 7 shown in Figure 7 , the elastic limiting piece 102 is separately manufactured and then welded to both ends of the short side of the pallet 1 to fix the elastic limiting piece 102 on the pallet 1. Through a certain shape design, the end of the elastic limiting piece 102 can be pulled up a certain distance along the direction perpendicular to the plane of the pallet 1 while maintaining elastic deformation, and this distance is greater than the thickness of the locking lug 201 of the fastening nut 2 and the locking lug 301 of the fixing nut 3. The elastic limiting piece 102 can be manufactured from the same sheet as the above-mentioned limiting hook 101, or can be separately manufactured and then fixed on the pallet 1 by welding.

[0049] The distance between the elastic limiting piece 102 and the limiting hook 101 in the circumferential direction of the pallet 1 is determined according to the dimensions of the locking lug 201 of the fastening nut 2 and the locking lug 301 of the fixing nut 3, so as to ensure that the fastening nut 2 and the fixing nut 3 can only move within a certain range near the bolt hole in the loosened state of the elastic limiting piece 102, and can be smoothly disassembled in the state where the elastic limiting piece 102 is pulled up.

[0050] As Figure 9As shown, L1-1 is the first width of the pallet 1 excluding the limit hook 101, that is, the actual width of the pallet 1. L1-2 is the second width of the limit hook 101. In the pallet nut assembly of this embodiment, the fastening nut 2 and the fixing nut 3 are basically the same in size, so the fastening nut 2 and the fixing nut 3 can achieve the limiting function through the limit hook 101 of the same size. The adjacent fixing nut 3 and the fastening nut 2 have opposite thread directions and can share an elastic limit piece 102. In some other embodiments of the present invention, the fixing nut 3 may not be used, and the fastening nut 2 and the countersunk head screw 7 are directly used to fix the pallet 1 on the nut side flange 5, or the pallet nut assembly is fixed by riveting means such as using rivets and other riveting components.

[0051] The limit hook 101 on the pallet 1 functions to limit the rotation of the fastening nut 2 or the fixing nut 3 during the tightening process. The elastic limit piece 102 on the pallet and the limit hook 101 jointly limit the axial and circumferential movement ranges of the fastening nut 2 or the fixing nut 3 on the pallet 1, so that the position of the fastening nut 2 or the fixing nut 3 can be adjusted within a certain range. Both the limit hook 101 and the elastic limit piece 102 can be formed by the sheet metal flanging process without complex molds. In terms of the manufacture of the pallet 1, the large sheet metal compression rate and stretching rate in the original design are avoided, and only the conventional cutting and plane bending processes need to be carried out on the sheet metal to form, without expensive and complex sheet metal molds, which can effectively reduce the production cost.

[0052] As Figure 11 , Figure 12 and Figure 13 shown, the fastening nut 2 is provided with two fastening nut stop ears 201, and the two fastening nut stop ears 201 are axially symmetric with respect to the nut axis. The fastening nut stop ear 201 and the limit hook 101 on the pallet 1 cooperate to achieve the stopping of the nut. In order to increase the friction between the fastening nut 2 and the pallet 1 during the tightening process, the mating surface 202 of the fastening nut is sandblasted. The surface roughness of the mating surface 202 of the fastening nut is increased by the sandblasting process. As Figure 12 shown, L2-1 and L2-2 are the length and width of the fastening nut 2 respectively, where L1-1 > L2-1 and L1-1 > L2-2 > L1-2. φ2 is the diameter of the fastening nut 2, where L2-2 = φ2 > L2-1. The outer side of the fastening nut stop ear 201 can be rounded or chamfered to reduce the risk of interference with adjacent nuts during the assembly process. At the same time, the fastening nut 2 has a self-locking function through self-locking capping.

[0053] As Figure 14 , Figure 15 and Figure 16As shown, the fixed nut 3 is provided with two fixed nut stop ears 301, and the fixed nut stop ears 301 are axially symmetric with respect to the axis of the fixed nut 3. The fixed nut stop ears 301 and the limit hook 101 on the support plate 1 cooperate to achieve the stop of the nut. In order to increase the friction between the fixed nut 3 and the support plate 1 during the tightening process, the mating surface 302 of the fixed nut seat is sandblasted. The surface roughness of the mating surface 302 of the fixed nut seat is increased through the sandblasting process. As Figure 15 shown, L3-1 and L3-2 are the length and width of the fixed nut 3 respectively. Among them, L1-1 > L3-1 and L1-1 > L3-2 > L1-2. φ3 is the diameter of the fixed nut 3. Among them, L3-2 = φ3 > L3-1. The outer side of the fixed nut stop ear 301 can be chamfered or rounded to reduce the risk of interference with adjacent nuts during the assembly process. At the same time, the fixed nut 3 has a self-locking function through self-locking caulking.

[0054] When the specifications of the fastening nut 2 or the fixed nut 3 are similar and the radius of gyration of the support plate 1 is different, the forming dies of the limit hook 101 and the elastic limit piece 102 can be shared. During the assembly, maintenance and repair of the tray nut assembly, a single fastening nut 2 or fixed nut 3 can be quickly replaced and installed, and the process will not damage the support plate 1.

[0055] Refer to Figure 17 , the specific steps for installing the adjacent fastening nut 2 and fixed nut 3 on the support plate 1 are as follows:

[0056] First step: Rotate the fixed nut 3 until the two sides corresponding to its L3-1 dimension are in the same direction as the limit hook 101. Since L3-1 is less than L1-1 and L3-2 = φ3 > L3-1, the center of the hole of the fixed nut 3 can be basically aligned with the center of the hole on the support plate 1;

[0057] Second step: Pull up the elastic limit piece 102 on the support plate 1. After rotating the fixed nut 3 clockwise by about 90°, release the elastic limit piece 102. Since L1-1 > L3-2 > L1-2, the fixed nut 3 can be basically clamped at the corresponding position of the limit hook 101, that is, the installation of the fixed nut 3 is completed;

[0058] Third step: Rotate the fastening nut 2 until the two sides corresponding to its L2 dimension are in the same direction as the limit hook 101. Since L2-1 is less than L1-1 and L2-2 = φ2 > L2-1, the center of the hole of the fastening nut 2 can be basically aligned with the center of the hole on the support plate 1;

[0059] Step 4: Pull up the elastic limiting piece 102 on the pallet 1. After rotating the fastening nut 2 counterclockwise by about 90°, release the elastic limiting piece 102. Since L1-1 > L2-2 > L1-2, the fastening nut 2 can be basically clamped at the corresponding position of the limiting hook 101, that is, the installation of the fastening nut 2 is completed. During this process, the fixing nut 3 can be pushed to the right to prevent its interference with the fastening nut stop ear 201 of the fastening nut 2. During the design of the pallet 1, the fastening nut 2 and the fixing nut 3, a 3D modeling software can be used to confirm that there is no interference during the installation process.

[0060] During the use of the pallet nut according to the embodiment of the present invention, first, the pallet 1 and the fixing nut 3 are fixed to one side flange by using the fixing nut 3 and the countersunk head bolt. After the other side flange is assembled to the corresponding position, the two flanges are connected by using the fastening bolt 4 and the fastening nut 2.

[0061] In some other embodiments of the present invention, the limiting hook 101 and the elastic limiting piece 102 can also obtain appropriate shapes and sizes through the finite element method according to the thickness of the plate used for the pallet 1, the dimensions of L1-1 and L1-2 of the pallet 1, the elastic modulus and yield strength of the material of the pallet 1. On the premise of avoiding irreversible plastic deformation of the elastic limiting piece 102 during the pulling-up process, it is allowed that the stop ear of the nut passes through the gap between the pulled-up elastic limiting piece 102 and the pallet 1.

[0062] In some other embodiments of the present invention, according to actual needs, the thickness and material of the elastic limiting piece 102 can be different from those of the pallet 1. The fixing method can be selected as welding means such as resistance spot welding, laser welding and brazing.

[0063] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the method embodiments described later, since they correspond to the system, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiments.

[0064] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A tray nut assembly for fixing a nut-side flange (5) and a bolt-side flange (6), characterized in that, Comprising: A pallet (1) with several bolt holes provided thereon; A fixing nut (3) and a fastening nut (2), the fixing nut (3) and the fastening nut (2) corresponding to the bolt holes one by one. A first connecting device passes through the bolt hole and the fixing nut (3) to be fixed to the flange on the fixing nut side (5), and a second connecting device passes through the bolt hole and the fastening nut (2) to connect and fix the flange on the fixing nut side (5) and the flange on the bolt side (6); An elastic limiting piece (102) is further provided on the pallet (1), and the elastic limiting piece (102) is arranged on one side of the short side of the pallet (1) facing each bolt hole; A limiting hook (101) is provided on the pallet (1), and the limiting hooks (101) are symmetrically arranged on both sides of the long side of the pallet (1) facing each bolt hole; A fastening nut stop ear (201) is provided on the fastening nut (2), and the fastening nut stop ear (201) is axially symmetric with respect to the axis of the fastening nut (2). A fixing nut stop ear (301) is provided on the fixing nut (3), and the fixing nut stop ear (301) is axially symmetric with respect to the axis of the fixing nut (3); The rotation directions of the ears of the fastening nut stop ear (201) and the fixing nut stop ear (301) are opposite.

2. The pallet nut assembly according to claim 1, wherein: The fastening nut (2) is detachably connected to the limiting hook (101) on the pallet (1) through the fastening nut stop ear (201).

3. The tray nut assembly according to claim 2, wherein, The fixing nut (3) is detachably connected to the limiting hook (101) on the pallet (1) through the fixing nut stop ear (301).

4. The tray nut assembly according to claim 1, wherein, The first connecting device includes a countersunk head screw (7), and the fixing nut (3) is connected to the flange on the fixing nut side (5) through the countersunk head screw (7).

5. The tray nut assembly according to claim 1, wherein The second connecting device includes a fastening bolt (4), and the fastening nut (2) connects the flange on the fixing nut side (5) and the flange on the bolt side (6) through the fastening bolt (4).

6. The pallet nut assembly according to claim 1, wherein: The first width of the pallet (1) L 1-1 is the maximum width of the inner side of the limiting hook (101) in the radial direction of the pallet (1), and the second width of the pallet (1) L 1-2 is the width of the opening of the limiting hook (101) in the radial direction of the pallet (1), and the width of the fastening nut (2) L 2-1 is the dimension of the fastening nut (2) in the direction perpendicular to the radial direction of the pallet (1) in the assembled state, and the length of the fastening nut (2) L 2-2 is the dimension of the fastening nut (2) in the radial direction of the pallet (1) in the assembled state and does not include the fastening nut stop ear (201), and the width of the fixing nut (3) L 3-1 is the dimension of the fixing nut (3) in the direction perpendicular to the radial direction of the pallet (1) in the assembled state, and the length of the fixing nut (3) L 3-2 is the dimension of the fixing nut (3) in the radial direction of the pallet (1) in the assembled state and does not include the fixing nut stop ear (301), where L 2-1 and L 3-1 are both less than L 1-1, L 1-1 > L 2-2 > L 1-2, L 1-1 > L 3-2 > L 1-2; the diameter of the fastening nut (2) is φ 2, L 2-2 = φ 2 > L 2-1; the diameter of the fixing nut (3) is φ 3, L 3-2 = φ 3 > L 3-1.

7. The tray nut assembly according to claim 1, wherein The mating surface of the fastening nut seat (202) of the fastening nut (2) and the mating surface of the fixing nut seat (302) of the fixing nut (3) are both rough surfaces.

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