Adjustable eccentric position hyperbolical bolt

Abstract

The utility model discloses an ultra tight fit bolt of adjustable eccentric position relates to bolt connection field, including bolt body, first bush and second bush, bolt body is arranged between first connecting piece and second connecting piece, and has screw rod part and taper portion, and screw rod part is connected with nut, and first connecting piece and second connecting piece are locked, the outer wall of taper portion has eccentric arrangement's first taper and second taper and distributes along the axial direction, first bush is sleeved on first taper, and second bush is sleeved on second taper, first connecting piece is set up first hole, is used for installing first bush, and second connecting piece is set up second hole, is used for installing second bush, at least one first oil groove is set up on first taper, and the channel is set up in bolt body, the channel is communicated with a first oil groove, and the cooperation surface of taper portion and first bush is realized dismantling with high pressure oil, the utility model discloses have the advantage that the adjustment adaptation ability is stronger, and bush dismantling mode is various.

Description

Technical Field

[0001] This utility model relates to the field of bolted connections, and specifically to an ultra-tight fit bolt with adjustable eccentric position. Background Technology

[0002] Ultra-tight bolts (also called hydraulic bolts) require extremely high precision in the bolt holes of the connecting parts. This necessitates on-site machining of the bolt holes after the connecting parts are bolted together. Since the dimensions of the bolt holes increase after machining, the bushings need to be machined to fit the dimensions of the machined bolt holes. This not only severely impacts the project's lead time but also significantly increases costs.

[0003] Without on-site processing, the existing hydraulic bolts will not provide a good fit between the bushing and the connecting parts after installation, posing a significant safety risk after the equipment is in operation. This will also have a major impact on the dynamic balance of high-speed equipment such as steam turbines. Furthermore, it will pose significant safety hazards in complex stress conditions, such as wind power generation equipment. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide an ultra-tight fitting bolt with adjustable eccentric position, stronger adjustment and adaptation capabilities, and multiple bushing disassembly methods.

[0005] The purpose of this utility model is achieved through the following technical solution: This adjustable eccentric ultra-tight fitting bolt includes a bolt body, a first bushing, and a second bushing. The bolt body is used to pass between a first connecting member and a second connecting member. The bolt body has a threaded portion and a tapered portion. The threaded portion is connected to a nut to lock the first connecting member and the second connecting member. A first tapered surface and a second tapered surface are distributed axially on the outer wall of the tapered portion, and the first tapered surface is eccentrically arranged relative to the second tapered surface. The first bushing is used to fit on the first tapered surface, and the second bushing is used to fit on the second tapered surface. The outer ring of the first bushing or the second bushing is eccentrically arranged relative to its inner ring. A first hole is opened on the first connecting member for installing the first bushing, and a second hole is opened on the second connecting member for installing the second bushing. At least one first oil groove is opened on the first tapered surface, and a channel is opened in the bolt body for injecting high-pressure oil. The channel communicates with one of the first oil grooves, and disassembly is achieved by using high-pressure oil to enter the mating surface between the tapered portion and the first bushing.

[0006] As a further technical solution, the screw portion includes a first end disposed on one side of the tapered portion and a second end disposed on the other side of the tapered portion. A first oil inlet is opened on the first end, a first oil inlet channel communicating with the first oil inlet is opened along the axial direction of the screw portion, and a first oil inlet hole is opened along the radial direction of the screw portion to connect the first oil inlet channel with a first oil groove on the first tapered surface. At least one second oil groove is also opened on the second tapered surface.

[0007] As a further technical solution, the first oil tank and the second oil tank adopt a spiral groove, a double spiral groove, or an annular oil tank.

[0008] As a further technical solution, both the first oil groove and the second oil groove are annular oil grooves, and several straight oil grooves are opened along the axial direction of the first conical surface and the second conical surface. Adjacent annular oil grooves on the first conical surface are connected by straight oil grooves, and adjacent annular oil grooves on the second conical surface are also connected by straight oil grooves.

[0009] As a further technical solution, a second oil inlet is provided on the second end, a second oil inlet channel communicating with the second oil inlet is provided along the axial direction of the screw portion, and a second oil inlet hole is provided along the radial direction of the screw portion to connect the second oil inlet channel with a second oil groove on the second conical surface.

[0010] As a further technical solution, the first oil injection channel extends into the conical part corresponding to the second conical surface, and a second oil injection hole is opened along the radial direction of the screw part to connect the first oil injection channel with a second oil groove on the second conical surface.

[0011] As a further technical solution, both the first hole and the second hole are through holes, and the cone surfaces of the first and second cone surfaces are opposite in direction.

[0012] As a further technical solution, both the first hole and the second hole are through holes, and the cone surfaces of the first and second cone surfaces are in the same direction.

[0013] As a further technical solution, the first hole is a through hole, the second hole is a blind hole, the tapered part passes through the first hole and extends into the second hole, and an oil injection port is opened at the end of the tapered part that exposes the first connecting member. The screw part passes through the tapered part through the oil injection port, forming an oil injection channel between the outer wall of the screw part and the inner wall of the tapered part. An oil injection hole is opened along the radial direction of the tapered part to connect the oil injection channel with a first oil groove on the first tapered surface. The end of the screw part that extends out of the first hole is pressed with the first connecting member by a nut and a washer, and the end of the screw part that extends into the second hole is engaged with the tapered part by a retaining ring.

[0014] As a further technical solution, the first bushing is provided with a bushing flange, and the bushing flange is pressed onto the plane of the first connecting member by using nuts and washers. The bushing flange is provided with several set screw holes.

[0015] As a further technical solution, the second bushing is provided with an opening.

[0016] The beneficial effects of this utility model are as follows: 1. Divide the bushing into two sections and tighten them with the bolts respectively. At the same time, the two conical surfaces of the bolts are slightly eccentric, and the corresponding bushing is also slightly eccentric. If the bolt holes of the related connecting parts are misaligned, the misalignment can be corrected by adjusting the eccentric position. 2. The bolt (conical surface) is equipped with an oil groove, allowing the bushing to be removed through the oil injection hole. The two conical surfaces can be fitted together, allowing high-pressure oil to be injected through the oil injection ports on both sides. Oil can then be injected into the conical surfaces of the bolt and bushing through the oil injection hole to remove the bushing; alternatively, one oil injection port can be used to inject high-pressure oil into two separate oil injection holes to remove the bushings on both sides. 3. The two conical surfaces on the conical part can be in the same direction or in opposite directions. The bushing at the small end can be removed by changing the taper, diameter, and the bonding force of the conical surfaces during installation. Then, the bushing at the large end can be removed by changing the sealing method. 4. It can be applied to blind hole applications, and the inner bushing taper can be relatively large, so the bushing can be disassembled without the oil injection method. The inner bushing can be opened to achieve a larger expansion amount and make it easier to disassemble. 5. The outer bushing is equipped with a flange, and a set screw hole can be provided on the flange face of the bushing. When the bushing cannot be disassembled by the oil injection method, the bushing can be removed by the set screw. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0018] Figure 2 This is a schematic diagram of the bolt structure in Embodiment 1 of this utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the second bushing (eccentric conical bushing) in Embodiment 1 of this utility model.

[0020] Figure 4 This is a schematic diagram of the bolt structure in Embodiment 2 of this utility model.

[0021] Figure 5 This is a structural schematic diagram of Embodiment 3 of the present invention.

[0022] Figure 6 This is a schematic diagram of the bolt structure in Embodiment 3 of this utility model.

[0023] Figure 7 This is a schematic diagram of the structure of the second bushing (eccentric conical bushing) in Embodiment 3 of this utility model.

[0024] Figure 8 This is a structural schematic diagram of Embodiment 4 of the present invention.

[0025] Figure 9 This is a structural schematic diagram of Embodiment 5 of the present invention.

[0026] Figure 10 This is a schematic diagram of the structure of the first bushing (eccentric conical bushing) in Embodiment 5 of this utility model.

[0027] Figure 11 This is a schematic diagram of the structure of the second bushing (without eccentric opening) in Embodiment 5 of this utility model.

[0028] Figure 12 This is a structural schematic diagram of Embodiment 6 of the present invention.

[0029] Explanation of reference numerals in the attached drawings: First connecting part 1, First hole 11, Second connecting part 2, Second hole 21, Bolt body 3, Screw part 31, First end 311, First oil inlet 312, First oil inlet channel 313, First oil inlet hole 314, Second end 315, Second oil inlet 316, Second oil inlet channel 317, Second oil inlet hole 318, Conical part 32, First conical surface 321, Second conical surface 322, Annular oil groove 323, Straight oil groove 324, Oil inlet 325, Oil inlet channel 326, Oil inlet hole 327, First bushing 4, Bushing flange 41, Top screw hole 411, Second bushing 5, Nut 6, Washer 7, Retaining ring 8, Opening 9. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings: Example 1: As shown in the attached document Figures 1-3 As shown, this adjustable eccentric ultra-tight fitting bolt includes a first connecting member 1, a first hole 11, a second connecting member 2, a second hole 21, a bolt body 3, a screw portion 31, a first end 311, a first oil inlet 312, a first oil channel 313, a first oil hole 314, a second end 315, a second oil inlet 316, a second oil channel 317, a second oil hole 318, a conical portion 32, a first conical surface 321, a second conical surface 322, an annular oil groove 323, a straight oil groove 324, an oil inlet 325, an oil channel 326, an oil hole 327, a first bushing 4, a second bushing 5, and a nut 6.

[0031] Reference Appendix Figure 1 A first hole 11 is made through the first connecting member 1, and a second bushing 4 (an eccentric conical bushing, i.e., the outer ring is eccentrically set relative to its inner ring, such as...) is installed in the first hole 11. Figure 3 As shown), a second hole 21 is formed through the second connecting member 2, and a second bushing 5 is installed in the second hole 21. Both the first hole 11 and the second hole 21 are through holes, and the bolt body 3 passes between the first connecting member 1 (first hole 11) and the second connecting member 2 (second hole 21). Figure 2As shown, the bolt body 3 has a threaded portion 31 (located on both sides) and a tapered portion 32 (located in the middle). The threaded portion 31 is threadedly connected to the nut 6, thereby locking the first connecting member 1 and the second connecting member 2 together. Figure 1 As shown.

[0032] Furthermore, a first conical surface 321 and a second conical surface 322 are axially distributed on the outer wall of the conical portion 32, and the first conical surface 321 is eccentrically arranged relative to the second conical surface 322. In this embodiment, the conical surfaces of the first conical surface 321 and the second conical surface 322 have opposite directions. The screw portion 31 includes a first end 311 disposed on one side of the conical portion 32. Figure 2 (left end) and the second end 315 (located on the other side of the tapered portion 32) Figure 2 (right end), such as Figure 1 , 2 As shown, a first bushing 4 is fitted on the first conical surface 321, and a second bushing 5 is fitted on the second conical surface 322. Simultaneously, several annular oil grooves 323 (at least two on each side) are radially formed on both the first and second conical surfaces 321 and 322. A first oil inlet 312 is formed on the first end 311, and a first oil inlet channel 313 communicating with the first oil inlet 312 is formed along the axial direction of the screw portion 31. A first oil inlet hole 314 is formed radially along the screw portion 31, and the first oil inlet hole 314 connects the first oil inlet channel 313 with the corresponding annular oil groove 323 on the first conical surface 321. A second oil inlet 316 is provided on the second end 315. A second oil inlet channel 317 communicating with the second oil inlet 316 is provided along the axial direction of the screw portion 31. A plurality of second oil inlets 318 are provided along the radial direction of the screw portion 31. The second oil inlets 318 can connect the second oil inlet channel 317 with the corresponding annular oil groove 323 on the second conical surface 322. Furthermore, a plurality of straight oil grooves 324 are provided along the axial direction of the first conical surface 321 and the second conical surface 322. Adjacent annular oil grooves 323 on the first conical surface 321 are connected by straight oil grooves 324, and adjacent annular oil grooves 323 on the second conical surface 322 are also connected by straight oil grooves 324.

[0033] Preferably, an annular oil groove 323 is used in this embodiment, but a spiral groove or a double spiral groove can also be used as an alternative.

[0034] Working principle: The bushing is designed in two sections (i.e., the first bushing 4 and the second bushing 5), which respectively engage with the tapered portion of the bolt (i.e., the first tapered surface 321 and the second tapered surface 322) through expansion and tightening. Furthermore, the two tapered surfaces of the bolt are slightly eccentric to each other, and a corresponding section of the bushing is also eccentrically designed, such as... Figure 3The first bushing 4. If there is a certain misalignment between the screw holes of the related connecting parts, the misalignment can be corrected by adjusting the eccentric position. Since the bolt has an annular oil groove 323, the bushing can be removed through the oil injection hole. When injecting oil, the two conical surfaces can be fitted with high-pressure oil through the oil injection ports on both sides (first oil injection port 312, second oil injection port 316), and the oil can be injected into the conical surfaces (at the annular oil groove 323) of the bolt and bushing through the oil injection holes (first oil injection hole 314, second oil injection hole 318) to remove the bushing.

[0035] Example 2: As Figure 4 As shown, the difference from Embodiment 1 is that the first oil injection channel 313 extends into the conical portion 32 corresponding to the second conical surface 322. Only one oil injection channel is provided and no second oil injection channel is provided. At the same time, a second oil injection hole 318 is opened along the radial direction of the screw portion 31. The second oil injection hole 318 is used to connect the first oil injection channel 313 with a second oil groove (i.e., an annular oil groove 323 on the second conical surface 322) on the second conical surface 322.

[0036] Working principle: Based on Example 1, high-pressure oil can be injected into both bushings using only one oil inlet (first oil inlet 312) and two oil inlets (first oil inlet 314 and second oil inlet 318) to complete the disassembly of the bushings on both sides.

[0037] Example 3: As Figure 5 , 6 As shown in Figure 7, the difference from Embodiment 1 is that the first conical surface 321 and the second conical surface 322 have the same conical surface direction. Correspondingly, the first bushing 4 and the second bushing 5 also have the same conical surface direction. The second bushing 5 adopts an eccentric conical bushing (the outer ring is eccentrically positioned relative to its inner ring, such as...). Figure 7 (As shown).

[0038] Working principle: When disassembling, first disassemble the small end ( Figure 5 The first bushing 4 (left end) is removed, followed by the removal of the other bushing (second bushing 5). The bushing at the small end is removed by varying the taper, diameter, and the contact force between the tapered surfaces during installation. The bushing at the large end is then removed by changing the sealing method. Figure 5 The bushing (right end).

[0039] Example 4: Figure 8 As shown, the difference from Embodiment 3 is that the first oil injection channel 313 extends into the conical portion 32 corresponding to the second conical surface 322. Only one oil injection channel is provided and no second oil injection channel is provided. At the same time, a second oil injection hole 318 is opened along the radial direction of the screw portion 31. The second oil injection hole 318 is used to connect the first oil injection channel 313 with a second oil groove (i.e., an annular oil groove 323 on the second conical surface 322) on the second conical surface 322.

[0040] Working principle: Similar to Example 2, based on Example 3, high-pressure oil can be injected into both bushings using only one oil inlet (first oil inlet 312) and two oil inlets (first oil inlet 314 and second oil inlet 318) to complete the disassembly of the bushings on both sides.

[0041] Example 5: Figure 9 , 10 As shown in Figure 11, the difference from Embodiment 1 is that the first hole 11 on the first connecting member 1 is a through hole, and the second hole 21 on the second connecting member 2 is a blind hole. The tapered portion 32 of the bolt body 3 passes through the first hole 11 and extends into the second hole 21. An oil injection port 325 is opened at the end of the tapered portion 32 that protrudes from the first connecting member 1. The threaded portion 31 of the bolt body 3 passes through the tapered portion 32 through the oil injection port 325, forming an oil injection channel 326 between the outer wall of the threaded portion 31 and the inner wall of the tapered portion 32. An oil injection hole 327 is opened radially along the tapered portion 32, and the oil injection hole 327 connects the oil injection channel 326 with an annular oil groove 323 on the first tapered surface 321. Only one oil injection hole 327 is opened, but two or more annular oil grooves 323 can be opened. Similar to Embodiment 1, adjacent annular oil grooves 323 on the first tapered surface 321 can be connected by a straight oil groove 324.

[0042] Furthermore, one end of the screw portion 31 extends out of the first hole 11 ( Figure 7 The left end) is pressed against the first connecting piece 1 by the nut 6 and the washer 7, and the end of the screw part 31 extends into the second hole 21. Figure 7 The right end) mates with the tapered part 32 via the retaining ring 8. For example... Figure 9 , 11 As shown, an opening 9 is provided on the second bushing 5, thereby achieving a larger expansion capacity and easier disassembly. The presence of the opening 9 eliminates the need for an oil injection hole 327 on the second conical surface 322. Figure 10 As shown, the first bushing 4 is an eccentric conical bushing (the outer ring is eccentrically set relative to its inner ring), and the second bushing 5 has a structure in which the inner and outer rings are not eccentric.

[0043] Working principle: In this type of blind hole application, the tapered portion 32 has tapered surfaces on both sides, with one side's tapered surface and the bushing's tapered surface being eccentric relative to the other side. The inner bushing (i.e., the second bushing 5) can have a relatively large taper, allowing for bushing disassembly without the need for oil injection. Additionally, the inner bushing can have an opening, such as... Figure 9 , 10 As shown, the second bushing 5 has an opening 9, which allows for greater expansion and easier disassembly. Furthermore, a retaining ring 8 is provided on the tapered portion 32, allowing the inner bushing to be pulled out during disassembly.

[0044] Example 6: As Figure 11As shown, the difference from embodiment 5 is that a bushing flange 41 is provided on the first bushing 4. During assembly, the bushing flange 41 is exposed on the plane of the first connecting member 1. The bushing flange 41 is pressed onto the plane of the first connecting member 1 by using nuts 6 and washers 7. Several set screw holes 411 are also provided on the bushing flange 41.

[0045] Working principle: The outer bushing (first bushing 4) is provided with a bushing flange 41. During installation, the bushing is pressed tight, and the inner end face of the bushing flange 41 is pressed against the plane of the first connecting member 1 using the nut 6 and the washer 7. Its advantage is that a set screw hole 411 can be machined on the surface of the bushing flange 41. When the bushing fails to be disassembled by the oil injection method, the bushing can be removed with the set screw, ensuring the disassembly of the connecting member.

[0046] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this utility model should fall within the protection scope of the appended claims.

Claims

1. An ultra-tight fit bolt with adjustable eccentric position, characterized by: The assembly includes a bolt body (3), a first bushing (4), and a second bushing (5). The bolt body (3) is used to pass between the first connecting member (1) and the second connecting member (2). The bolt body (3) has a threaded portion (31) and a tapered portion (32). The threaded portion (31) is connected to a nut (6) to lock the first connecting member (1) and the second connecting member (2). The outer wall of the tapered portion (32) has a first tapered surface (321) and a second tapered surface (322) distributed axially, and the first tapered surface (321) is eccentrically arranged relative to the second tapered surface (322). The first bushing (4) is used to fit onto the first tapered surface (321). The second bushing (5) is used to be fitted on the second conical surface (322), and the outer ring of the first bushing (4) or the second bushing (5) is eccentrically set relative to its inner ring; the first connecting member (1) has a first hole (11) for installing the first bushing (4), and the second connecting member (2) has a second hole (21) for installing the second bushing (5); at least one first oil groove is opened on the first conical surface (321), and a channel is opened in the bolt body (3) for injecting high-pressure oil. The channel is connected to a first oil groove, and disassembly is achieved by using high-pressure oil to enter the mating surface of the conical part (32) and the first bushing (4).

2. The adjustable eccentric position hyperboloid bolt of claim 1, wherein: The screw section (31) includes a first end (311) disposed on one side of the conical section (32) and a second end (315) disposed on the other side of the conical section (32). A first oil inlet (312) is opened on the first end (311), a first oil inlet channel (313) communicating with the first oil inlet (312) is opened along the axial direction of the screw section (31), and a first oil inlet hole (314) is opened along the radial direction of the screw section (31) to connect the first oil inlet channel (313) with a first oil groove on the first conical surface (321). At least one second oil groove is also opened on the second conical surface (322).

3. The adjustable eccentric position hyperboloid bolt of claim 2, wherein: Both the first oil groove and the second oil groove adopt annular oil groove (323), and a number of straight oil grooves (324) are opened along the axial direction of the first conical surface (321) and the second conical surface (322). The adjacent annular oil grooves (323) on the first conical surface (321) are connected by straight oil grooves (324), and the adjacent annular oil grooves (323) on the second conical surface (322) are also connected by straight oil grooves (324).

4. The adjustable eccentric position hyperboloid bolt of claim 2, wherein: A second oil inlet (316) is provided on the second end (315), a second oil inlet channel (317) is provided along the axial direction of the screw part (31) and communicates with the second oil inlet (316), and a second oil inlet hole (318) is provided along the radial direction of the screw part (31) to connect the second oil inlet channel (317) with a second oil groove on the second conical surface (322).

5. The adjustable eccentric position hyperboloid bolt of claim 2, wherein: The first oil injection channel (313) extends into the conical part (32) corresponding to the second conical surface (322), and a second oil injection hole (318) is opened in the radial direction of the screw part (31) to connect the first oil injection channel (313) with a second oil groove on the second conical surface (322).

6. The adjustable eccentric position hyperboloid bolt of claim 4 or 5, wherein: Both the first hole (11) and the second hole (21) are through holes, and the cone surfaces of the first cone surface (321) and the second cone surface (322) are opposite in direction.

7. The adjustable eccentric position hyperboloid bolt of claim 4 or 5, wherein: The first hole (11) and the second hole (21) are both through holes, and the first conical surface (321) and the second conical surface (322) have the same conical direction.

8. The adjustable eccentric position hyperboloid bolt of claim 1, wherein: The first hole (11) is a through hole, and the second hole (21) is a blind hole. The tapered part (32) passes through the first hole (11) and extends into the second hole (21). An oil inlet (325) is opened at the end of the tapered part (32) that exposes the first connecting member (1). The screw part (31) passes through the tapered part (32) through the oil inlet (325). An oil inlet channel (326) is formed between the outer wall of the screw part (31) and the inner wall of the tapered part (32). An oil inlet hole (327) is opened along the radial direction of the tapered part (32) to connect the oil inlet channel (326) with a first oil groove on the first conical surface (321). The end of the screw part (31) that extends out of the first hole (11) is pressed with the first connecting member (1) by the nut (6) and the washer (7). The end of the screw part (31) that extends into the second hole (21) is engaged with the tapered part (32) by the retaining ring (8).

9. The adjustable eccentric position hyperboloid bolt of claim 8, wherein: The first bushing (4) is provided with a bushing flange (41). The bushing flange (41) is pressed onto the plane of the first connecting member (1) by using nuts (6) and gaskets (7). The bushing flange (41) is provided with a number of set screw holes (411).

10. The adjustable eccentric position hyperboloid bolt of claim 8 or 9, wherein: The second bushing (5) has an opening (9).

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