Hydraulic fitting bolt assembling and disassembling system

Abstract

The utility model discloses a hydraulic fitting bolt assembling and disassembling system which comprises a hydraulic tensioner, a pull rod, a tensioner ring, an expansion ring used for expanding a taper sleeve, a disassembling ring used for disassembling a bud leaf fitting bolt through a disassembling ring method, a pre-tightening ring, an adapter sleeve, a deflector rod used for disassembling a nut and an oil injection rod used for disassembling the hydraulic fitting bolt through an oil injection method. The hydraulic fitting bolt dismounting device is reasonable in structure, scientific in working mode, simple and efficient, and solves the technical problems of mounting and dismounting of hydraulic fitting bolts.

Description

Technical Field

[0001] The utility model relates to the field of fasteners, in particular to a hydraulic tight-fitting bolt assembly and disassembly system. Background Art

[0002] When ordinary bolts are used to transmit torque, there is generally a gap or transition fit between the bolt and the bolt hole. Torque is transmitted solely through the friction torque between the flanges generated by the preload of the nut. The transmitted torque is low and cannot produce an ideal, stable, and rigid connection. When operating conditions change rapidly, the instantaneous torque surges, making it very easy for the friction torque to be insufficient to support the instantaneous torque. For example, steam turbine and gas turbine generator sets can experience instantaneous torque greater than the rated torque during startup, shutdown, and grid connection. This can cause relative slippage between the coupling and the wheels, causing some coupling bolts to become tangent to the bolt holes. This can lead to bolt holes becoming rough, bolts becoming stuck, or even seizing, making bolt removal difficult. Peak-shaving units, in particular, are on constant standby and frequently start, stop, and connect to the grid. This increases the probability of bolts becoming tangent to the bolt holes, severely impacting maintenance cycles.

[0003] In order to solve the above problems, the utility model patent with patent application number 202220227484.3 discloses a hydraulic tightening bolt system, which is suitable for couplings with through-hole bolt holes. It can solve the technical problems in the prior art of bolt hole roughening or bolt jamming or even biting. However, the technical solution itself still has certain problems.

[0004] For example, hydraulic tightening bolts sometimes cannot be installed or removed normally, which will seriously affect the user's maintenance period. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention discloses a hydraulic tight-fitting bolt assembly and disassembly system. The technical solution of the present invention is implemented as follows:

[0006] A hydraulic tight-fitting bolt assembly and disassembly system includes a hydraulic tensioner, a pull rod, a tensioner ring, an expansion ring for expanding a taper sleeve, a disassembly ring for disassembling the bud-leaf tight-fitting bolt by a disassembly ring method, a pre-tightening ring, an adapter sleeve, a lever for disassembling a nut, and an oiling rod for disassembling the hydraulic tight-fitting bolt by an oiling method.

[0007] Preferably, one end of the pull rod is provided with an external hexagon, and the other end is provided with a tapered thread; the middle part of the pull rod is provided with an external thread.

[0008] Preferably, the hydraulic tensioner includes a first hydraulic quick connector; the hydraulic quick connector is provided with an internal thread that cooperates with the external thread in the middle portion of the pull rod.

[0009] Preferably, the stretcher ring includes a stretching ring outer circumferential surface, a first stepped hole and a second stepped hole, and the first stepped hole and the second stepped hole have the same diameter.

[0010] Preferably, the expansion ring includes a first outer circumferential surface of the expansion ring, an inner circumferential surface of the expansion ring and a second outer circumferential surface of the expansion ring;

[0011] The first outer circumferential surface of the expansion ring and the second outer circumferential surface of the expansion ring form a stepped shaft;

[0012] The diameter of the first outer circumferential surface of the expansion ring is the same as the diameter of the first stepped hole.

[0013] Preferably, the pre-tightening ring comprises an outer circumferential surface of the pre-tightening ring and an inner circumferential surface of the pre-tightening ring;

[0014] An opening is provided on the outer circumferential surface of the pre-tightening ring.

[0015] Preferably, the adapter sleeve includes an adapter sleeve outer circular surface and an adapter sleeve inner circular surface;

[0016] A plurality of through holes are formed on the inner wall of the adapter sleeve, a pin is formed on the end surface of the adapter sleeve, and the diameter of the shifting rod is the same as the diameter of the through holes.

[0017] Preferably, the oil filling rod is provided with a second hydraulic quick connector at one end, and a cylindrical external thread and a sealing surface at the other end, and a through hole is provided inside the oil filling rod.

[0018] Preferably, the disassembly ring includes a first disassembly ring outer circular surface, a second disassembly ring outer circular surface and a disassembly ring inner circular surface;

[0019] The outer circumferential surface of the first disassembly ring and the outer circumferential surface of the second disassembly ring form a stepped shaft;

[0020] The diameter of the outer circumferential surface of the first disassembly ring is the same as the diameter of the first step hole.

[0021] The hydraulically tightened bolt assembly and disassembly system is used for installing and removing hydraulically tightened bolts. Installation involves tightening the bolt's taper sleeve and pre-tightening the bolt's nut. Disassembly involves using a disassembly ring or oil injection. Different components are assembled during expansion, pre-tightening, disassembly using a disassembly ring, or oil injection.

[0022] Install the hydraulic tightening bolts:

[0023] The first step is expansion. First, place the tapered sleeve of the hydraulically tightened bolt over the bolt and insert it into the bolt hole. Then, install the expansion ring, pull rod, tensioner ring, and hydraulic tensioner in sequence on the small end of the taper. Hydraulic oil is then injected into the hydraulic tensioner to generate tension, causing the bolt to slide. The expansion ring, with its stepped shaft structure, positions the tapered sleeve, causing relative displacement between the bolt and sleeve. The tapered surface causes the sleeve to expand, ultimately forming an interference fit with the bolt hole. Finally, remove the aforementioned tools.

[0024] The second step is pre-tightening. First, manually tighten the nuts onto both ends of the bolt. Then, install the pull rod, pre-tightening ring, adapter sleeve, and hydraulic tensioner in sequence. Insert the adapter sleeve's pin into the pinhole on the nut. Next, inject hydraulic oil into the hydraulic tensioner to generate tension, lengthening the bolt. Simultaneously, insert a lever into the adapter sleeve's through-hole and turn it in the direction necessary to tighten the threads. Once the desired pre-tightening force is reached, remove the tools. This completes the hydraulic bolt installation.

[0025] Removing the hydraulic tightening bolts:

[0026] There are two methods to disassemble hydraulic bolts, namely oil injection method and disassembly ring method.

[0027] First, follow the pre-tightening steps in reverse order to loosen the nut at the small end of the taper. Then, use the oil injection method to disassemble the bolt. Unscrew the nut a certain distance and install the oil injection rod. Next, inject hydraulic oil into the oil injection rod. As the hydraulic oil penetrates, the friction coefficient between the bolt and the taper sleeve decreases, causing the taper surfaces to separate. This completes the hydraulic bolt disassembly.

[0028] If the oil injection method fails, use the disassembly ring method. Remove the nuts at both ends of the hydraulic tightening bolt, then install the pull rod, disassembly ring, tensioner ring, and hydraulic tensioner on the large end of the taper in sequence; then inject hydraulic oil into the hydraulic tensioner to generate tension to pull the bolt to slide; the disassembly ring uses its stepped shaft structure to position the taper sleeve, thereby causing the bolt and taper sleeve to produce relative displacement and separation, and the hydraulic bolt is disassembled.

[0029] The technical solution of the utility model can solve the installation and disassembly of hydraulic tight-fitting bolts in actual applications; the installation and disassembly tool provided by the utility model is simple and reasonable, easy to operate and controllable, has a long service life and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom," "top," "inner," and "outer" refer to directions toward or away from the geometric center of a particular component, respectively.

[0032] Figure 1 This is a structural schematic diagram of an embodiment of a hydraulically tightened bolt;

[0033] Figure 2 This is a schematic diagram of the expansion installation structure of an embodiment of a hydraulically tightened bolt;

[0034] Figure 3 This is a schematic diagram of a pre-tightening installation structure of an embodiment of a hydraulically tightened bolt;

[0035] Figure 4 A schematic diagram of a disassembly structure using a disassembly ring method for an embodiment of a hydraulically tightened bolt;

[0036] Figure 5 A schematic diagram of a disassembly structure of a hydraulically tightened bolt using an oil injection method;

[0037] Figure 6 A schematic diagram of a bolt according to an embodiment of a hydraulically tightened bolt;

[0038] Figure 7 A schematic diagram of a tapered sleeve of an embodiment of a hydraulically tightened bolt;

[0039] Figure 8 A schematic diagram of a nut in an embodiment of a hydraulically tightened bolt;

[0040] Figure 9 This is a schematic diagram of a pull rod structure of an embodiment of a hydraulic tight-fit bolt assembly and disassembly system;

[0041] Figure 10 This is a structural schematic diagram of a hydraulic tensioner in an embodiment of a hydraulic tight-fit bolt assembly and disassembly system;

[0042] Figure 11 This is a schematic diagram of the tensioner ring structure of an embodiment of a hydraulic tight-fit bolt assembly and disassembly system;

[0043] Figure 12 This is a schematic diagram of the expansion ring structure of an embodiment of a hydraulic tight-fit bolt assembly and disassembly system;

[0044] Figure 13 This is a schematic diagram of the pre-tightening ring structure of an embodiment of a hydraulic tight-fitting bolt assembly and disassembly system;

[0045] Figure 14 A schematic diagram of a lever structure of an embodiment of a hydraulically tightened bolt assembly and disassembly system;

[0046] Figure 15 This is a schematic diagram of the adapter sleeve bolt structure of an embodiment of a hydraulic tight-fit bolt assembly and disassembly system;

[0047] Figure 16 This is a schematic diagram of the oil filling rod structure of an embodiment of a hydraulic tight-fit bolt assembly and disassembly system;

[0048] Figure 17 This is a schematic diagram of a disassembly ring structure of an embodiment of a hydraulic tight-fitting bolt assembly and disassembly system;

[0049] In the above drawings, the figure numbers represent:

[0050] 1. Bolts;

[0051] 1a-first conical internal thread, 1b-first external thread, 1c-external conical surface, 1d-radial oil hole,

[0052] 1e-screw hole, 1f-axial oil filling hole, 1g-annular oil groove, 1h-spiral oil groove,

[0053] 1j-second external thread, 1k-second conical internal thread;

[0054] 2. Cone sleeve;

[0055] 2a—cylindrical surface, 2b—inner conical surface, 2c—small taper end surface, 2d—large taper end surface; 3. Nut;

[0056] 3a- nut pin hole, 3b- nut internal thread, 3c- nut outer surface;

[0057] 4. Pull rod;

[0058] 4a-external hexagonal head, 4b-external thread of tie rod, 4c-taper thread of tie rod;

[0059] 5. Hydraulic stretcher;

[0060] 5a-quick connector, 5b-internal thread of hydraulic tensioner;

[0061] 6. Tensile ring;

[0062] 6a-first step hole, 6b-external surface of the stretcher ring, 6c-second step hole;

[0063] 7. Expansion ring;

[0064] 7a- first outer circumferential surface of the expansion ring, 7b- inner circumferential surface of the expansion ring, 7c- second outer circumferential surface of the expansion ring;

[0065] 8. Preload ring;

[0066] 8a-external circular surface of the expansion ring, 8b-inner circular surface of the expansion ring, 8c-opening;

[0067] 9. Push the lever;

[0068] 10. Adapter sleeve;

[0069] 10a- outer surface of the adapter sleeve, 10b- inner surface of the adapter sleeve, 10c- through hole of the adapter sleeve, 10d- pin of the adapter sleeve;

[0070] 11. Oil filling rod;

[0071] 11a-hydraulic quick connector, 11b-oil filling rod external thread, 11c-sealing surface, 11d-through hole;

[0072] 12. Disassembly ring;

[0073] 12a- first outer circumferential surface of the disassembly ring, 12b- inner circumferential surface of the disassembly ring, 12c- second outer circumferential surface of the disassembly ring; DETAILED DESCRIPTION

[0074] The following will be combined with the embodiments of the present invention and the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0075] Example

[0076] In a specific embodiment, Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, a hydraulic tight-fit bolt assembly and disassembly system is used to disassemble Figure 1 A hydraulically tightened bolt is shown. The bolt comprises a bolt 1, a tapered sleeve 2, and a nut 3. The assembly and disassembly system comprises a pull rod 4, a hydraulic tensioner 5, a tensioner ring 6, an expansion ring 7, a preload ring 8, an oiling rod 9, an adapter sleeve 10, an oiling rod 11, and a disassembly ring 12.

[0077] like Figure 6 As shown, the bolt 1 is provided with an outer conical surface 1c in the middle, and a first outer thread 1b and a second outer thread 1j are provided on the outside of both ends respectively. From the two ends to the center, there are first conical internal threads 1a and second conical internal threads 1k, first cylindrical internal threads 1e and second cylindrical internal threads 1i in sequence; one of the cylindrical internal threads 1e has an axial oil filling hole 1f at the end; the bolt 1 is also provided with a radial oil hole 1d, an annular oil groove 1g, and a spiral oil groove 1h.

[0078] like Figure 7 As shown, the inner side of the cone sleeve 2 is an inner conical surface 2b, which matches the outer conical surface 1c; the outer side of the cone sleeve 2 is a cylindrical surface 2a.

[0079] like Figure 8 As shown, the end face of the nut 3 is provided with a nut pin hole 3a, a nut internal thread 3b, and a nut outer circular surface 3c.

[0080] like Figure 9 As shown, the middle of the pull rod 4 is a pull rod external thread 4b, one end is an external hexagon 4a, and the other end is a pull rod tapered thread 4c; the pull rod tapered thread 4c is consistent with the specifications of the first tapered internal thread 1a and the second tapered internal thread 1k of the bolt 1.

[0081] like Figure 10 As shown, the hydraulic tensioner 5 is equipped with a first hydraulic quick connector 5a, and a hydraulic tensioner internal thread 5b is provided inside; the specifications of the hydraulic tensioner internal thread 5b are consistent with the specifications of the pull rod external thread 4b of the pull rod 4.

[0082] like Figure 11 As shown, the stretcher ring 6 is a circular ring structure, and a first step hole 6a and a second step hole 6c are respectively provided on its two side surfaces; the stretcher ring 6 includes a stretching ring outer circular surface 6b.

[0083] like Figure 12 As shown, the expansion ring 7 is a circular ring structure, including a first outer cylindrical surface 7a of the expansion ring, an inner cylindrical surface 7b of the expansion ring and a second outer cylindrical surface 7c of the expansion ring; the first outer cylindrical surface 7a of the expansion ring and the second outer cylindrical surface 7c of the expansion ring form a stepped axis; wherein the diameter of the first outer cylindrical surface 7a of the expansion ring with a larger diameter is the same as the diameter of the first step hole 6a and the second step hole 6c.

[0084] like Figure 13 As shown, the pre-tightening ring 8 is a circular ring structure, including a pre-tightening ring outer surface 8a and a pre-tightening ring inner surface 8b; an opening 8c is provided on the pre-tightening ring outer surface 8a.

[0085] like Figure 14 As shown, the adapter sleeve 10 includes an adapter sleeve outer circular surface 10a and an adapter sleeve inner circular surface 10b; a plurality of adapter sleeve through holes 10c are opened on the circumference of the adapter sleeve 10, and an adapter sleeve pin 10d is provided on the end face of the adapter sleeve 10, and the diameter of the shift rod 9 is the same as the diameter of the adapter sleeve through hole 10c.

[0086] like Figure 15 As shown, the shift rod 9 is a cylinder and can be inserted into the through hole 10b of the adapter sleeve 9.

[0087] like Figure 16 As shown, the oil filling rod 11 is provided with a second hydraulic quick connector 11a at one end, and an oil filling rod external thread 10b and a sealing surface 11c at the other end, and a through hole 11d is provided inside.

[0088] like Figure 17 As shown, the disassembly ring 12 is a circular ring structure, and the disassembly ring 12 includes a first disassembly ring outer circular surface 12a, a second disassembly ring outer circular surface 12c and a disassembly ring inner circular surface 12b; the first disassembly ring outer circular surface 12a and the second disassembly ring outer circular surface 12c form a stepped shaft; wherein the diameter of the second disassembly ring outer circular surface 12c with a larger shaft diameter is the same as the diameter of the first step hole 6a and the second step hole 6c.

[0089] The hydraulically tightened bolt assembly and removal system in this embodiment is used for installing and removing hydraulically tightened bolts. Installation of the hydraulically tightened bolts involves tightening the bolt's taper sleeve and pre-tightening the bolt's nut. Removal of the hydraulically tightened bolts involves either a removal ring or oil injection. Different components are assembled during expansion, pre-tightening, removal of the bolt using the removal ring, or oil injection.

[0090] Install the hydraulic tightening bolts:

[0091] like Figure 2 As shown, the first step is tightening. First, place the taper sleeve 2 over the bolt 1 and insert it into the bolt hole. Then, install the pull rod 4, expansion ring 7, tensioner ring 6, and hydraulic tensioner 5, sequentially, at the first conical internal thread 1a of the bolt 1. Hydraulic oil is then injected into the hydraulic tensioner 5 to generate tension, pulling the bolt 1 to slide. The expansion ring 7, with its stepped shaft structure, positions the taper sleeve 2, causing relative displacement between the bolt 1 and the sleeve 2. The tapered surface causes the sleeve 2 to expand, ultimately forming an interference fit with the bolt hole. Finally, remove the aforementioned tools.

[0092] like Figure 3 As shown, the second step is pre-tightening. First, manually tighten the two nuts 3 at each end of the bolt 1. Then, install the pull rod 4, pre-tightening ring 8, adapter sleeve 10, and hydraulic tensioner 5 in sequence. The adapter sleeve pin 10d is inserted into the nut pin hole 3a on the nut 3. Next, inject hydraulic oil into the hydraulic tensioner 5 to generate tension, stretching the bolt 2. Simultaneously, insert the lever 9 into the adapter sleeve through-hole 10c and move the lever 9 in the direction of tightening the threads. Once the desired pre-tightening force is achieved, remove the tools. At this point, the hydraulic bolt installation is complete.

[0093] There are two methods to disassemble the hydraulic tightening bolts, namely oil injection method (such as Figure 5 as shown) and disassembly ring method (as shown) Figure 4As shown). First, follow the reverse operation of the pre-tightening steps to loosen the nut 3 of the small end face 2c of the taper. Then use the oil injection method to disassemble, unscrew the nut 3 a certain distance, and install the oil injection rod 11; then inject hydraulic oil into the oil injection rod 11, and the friction coefficient between the bolt 1 and the tapered sleeve 2 is reduced under the penetration of the hydraulic oil, so that the tapered surfaces are separated, and the hydraulic tight-fitting bolt is disassembled. If the oil injection method fails to disassemble, use the disassembly ring method to disassemble. Remove the nuts 3 of the small end face 2c of the taper and the large end face 2d of the taper, and then install the pull rod 4, disassembly ring 12, tensioner ring 6, and hydraulic tensioner 5 in sequence at the second conical internal thread 1k of the bolt 1; then inject hydraulic oil into the hydraulic tensioner 5 to generate tension to pull the bolt 1 to slide; the disassembly ring 12 relies on its stepped shaft structure to achieve the positioning of the tapered sleeve 2, so that the bolt 1 and the tapered sleeve 2 produce relative displacement and separation, and the hydraulic bolt is disassembled.

[0094] In summary, the installation and disassembly tools for hydraulic clamping bolts can better complete the installation and disassembly of hydraulic clamping bolts.

[0095] The utility model has a reasonable structure, a scientific working method, is simple and efficient, solves the problem of rapid installation and disassembly of hydraulic tightening bolts in the wheel hole of the coupling rotor, is reusable, and has controllable installation parameters, which greatly saves equipment maintenance time and improves maintenance quality.

[0096] It should be pointed out that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic tight-fit bolt assembly and disassembly system, characterized in that: It includes a hydraulic tensioner, a pull rod, a tensioner ring, an expansion ring for expanding the taper sleeve, a disassembly ring for disassembling the bud-leaf tight-fitting bolts by the disassembly ring method, a preload ring, an adapter sleeve, a lever for disassembling the nut, and an oiling rod for disassembling the hydraulic tight-fitting bolts by the oiling method; One end of the pull rod is provided with an external hexagon, and the other end is provided with a tapered thread; the middle part of the pull rod is provided with an external thread; The hydraulic tensioner includes a first hydraulic quick connector; the hydraulic quick connector is provided with an internal thread that cooperates with the external thread in the middle of the pull rod; The stretcher ring comprises an outer circumferential surface of the stretcher ring, a first stepped hole and a second stepped hole, wherein the diameters of the first stepped hole and the second stepped hole are the same; The expansion ring comprises a first outer circumferential surface of the expansion ring, an inner circumferential surface of the expansion ring and a second outer circumferential surface of the expansion ring; The first outer circumferential surface of the expansion ring and the second outer circumferential surface of the expansion ring form a stepped shaft; The diameter of the first outer circumferential surface of the expansion ring is the same as the diameter of the first stepped hole; The pre-tightening ring comprises an outer circumferential surface and an inner circumferential surface; An opening is provided on the outer circumferential surface of the preload ring; The adapter sleeve includes an adapter sleeve outer circular surface and an adapter sleeve inner circular surface; The inner wall of the adapter sleeve is provided with a plurality of through holes, the end surface of the adapter sleeve is provided with a pin, and the diameter of the shifting rod is the same as the diameter of the through holes; One end of the oil filling rod is provided with a second hydraulic quick connector, the other end is provided with a cylindrical external thread and a sealing surface, and a through hole is provided inside the oil filling rod; The disassembly ring comprises a first disassembly ring outer circular surface, a second disassembly ring outer circular surface and a disassembly ring inner circular surface; The outer circumferential surface of the first disassembly ring and the outer circumferential surface of the second disassembly ring form a stepped shaft; The diameter of the outer circumferential surface of the first disassembly ring is the same as the diameter of the first step hole.

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