Maintenance device for bolts between flanges

Abstract

The utility model relates to the technical field of bolt maintenance, in particular to a maintenance device for bolts between flanges, which comprises a plurality of groups of connecting chain plates, grease injection heads and injection needles, the plurality of groups of connecting chain plates are connected end to end to form an annular structure capable of winding the peripheries of the flanges, fixing holes are formed in part of the connecting chain plates, and the grease injection heads are connected with the injection needles. The grease injection head is installed on the fixing hole and connected with the injection needle, the connecting chain plate and the chain plate with the hole are arranged on the outer side of the flange plate in a sleeving mode, the injection needle penetrates into the inner side of the flange plate, and the grease gun is connected with the grease injection head, so that lubricating oil is injected into the bolt between the flanges, the surface structure of the bolt is protected, rapid corrosion is avoided, and efficient maintenance of the bolt between the flanges is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt maintenance, and more specifically, to a bolt maintenance device between flanges. Background Art

[0002] Flange connection is a commonly used pipe fitting connection method. By fixing the pipe fitting and the flange plate with bolts, the continuity and tightness of the medium during pipeline transmission are ensured. Such a connection method is also widely used in offshore oil and gas production platforms, and tens of thousands of bolts are used during installation. At present, carbon steel bolts are commonly used in bolts. Carbon steel bolts have high strength and low cost, but their corrosion resistance is poor. Usually, surface treatment methods such as Teflon coating or galvanizing are adopted. However, during the installation, maintenance, and disassembly of the bolts, the coating will inevitably be completely or partially damaged. In the case of being exposed to the air, the corrosion phenomenon will occur very quickly; secondly, the bolts are formed by casting, and there are slight differences in the material composition between them and the flange, and there is a potential difference between the two, which may cause electrochemical corrosion.

[0003] Since the traditional coating cannot play a protective role, it is necessary to maintain the bolts to ensure their service life. The usual method is to apply grease on their surfaces. However, the bolts between flanges are usually restricted by space and tools. When directly dripping grease into the bolts, it is easy to have uncoated positions, and the bolts cannot be well maintained, which will still cause corrosion of the bolts, reduce the strength, cause oil and gas leakage, and bring very serious potential hazards to the production of offshore oil and gas fields. Summary of the Utility Model

[0004] Aiming at the problems in the prior art solutions that the grease application on the bolts between flanges is not in place and the bolt maintenance effect is poor, the utility model provides a bolt maintenance device between flanges, which has a simple structure and is easy to use, and can efficiently and quickly apply grease to the bolts between flanges to provide excellent maintenance effects.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A bolt maintenance device between flanges includes multiple groups of connecting chain plates, a grease injection head, and an injection needle. The multiple groups of connecting chain plates are connected end to end to form an annular structure that can surround the outer circumference of the flange. Fixing holes are opened on some of the connecting chain plates, and the grease injection head is installed on the fixing holes and connected to the injection needle.

[0007] The connecting link plates and the perforated link plates are connected to each other to form a circular ring and sleeved on the outer side of the flange that needs bolt maintenance. Fixing holes for installing a grease injection head are provided on some of the connecting link plates. The grease injection head is connected with an injection needle pointing to the inner side of the flange. The user aligns the grease gun with the grease injection head and injects grease into the bolts between the flanges through the grease injection head and the injection needle. The connecting link plates fix the position of the grease injection head, ensuring the stability of the grease injection process. At the same time, by setting fixing holes on the connecting link plates at different positions, grease can be injected into the bolt pairs at various positions of the flange. The overall structure of the device is simple and easy to use, achieving efficient and fast maintenance of the bolts between the flanges and avoiding potential safety hazards caused by rapid corrosion of the bolts.

[0008] Further, one side of the connecting link plate is provided with a first connecting part, and the other side is provided with a second connecting part. The first connecting part of the connecting link plate is movably connected to the second connecting part of the adjacent connecting link plate. The movable connection between the first connecting part and the second connecting part can fix the positions of the adjacent connecting link plate and the perforated link plate, and at the same time, it can be adjusted adaptively according to the size of the flange, and can be used for flanges of various specifications.

[0009] Further, the first connecting part is a claw, and the second connecting part is a slot; or the first connecting part is a slot, and the second connecting part is a claw, and the claw is connected to the slot. The perforated link plate and the connecting link plate are connected through the slot and the claw, and the structure is stable and the installation is convenient and fast.

[0010] Further, the bolt maintenance device between the flanges further includes a connecting key. Both the first connecting part and the second connecting part are connecting holes, and the connecting key passes through the first connecting part and the second connecting part. With the cooperation of the connecting key and the connecting hole, the frictional resistance between adjacent connecting link plates is small, relative rotation can occur, and the relative position is easy to adjust, and it can fit on the outer side of the flange.

[0011] Further, the bolt maintenance device between the flanges further includes a tension rod. One end of the tension rod is connected to the first connecting part, and the other end is connected to the second connecting part. The tension rod can provide a tensile force for the whole bolt maintenance device between the flanges. By connecting the first connecting part and the second connecting part of the adjacent connecting link plates, the connected groups of link plates can be fixed on the flange.

[0012] Further, the bolt maintenance device between the flanges further includes a tightening link plate provided with a plurality of installation slots. One end of the tightening link plate is provided with an installation hole. The connecting key passes through the installation hole and is connected to the second connecting part. One end of the tension rod is connected to the first connecting part, and the other end is clamped with the installation slot. The tension rod can cooperate with the plurality of installation slots on the tightening link plate, and different positions of the installation slots can be selected according to the size of the flange to adjust the overall tension of the bolt maintenance device.

[0013] Furthermore, the tension rod is U-shaped, and the installation card slot is arc-shaped with the distance between adjacent installation card slots being less than the width of the connecting link plate. The U-shaped tension rod facilitates the connection between the first connection part and the arc-shaped installation card slot, making the installation process convenient and fast. Controlling the distance between adjacent installation card slots can increase the installation positions of the tension rod and provide various tension forces.

[0014] Furthermore, the grease injection head is a straight-through grease cup. The straight-through grease cup is externally provided with threads, suitable for various grease guns. The internal oil injection mechanism can stably supply lubricating oil or grease to the equipment, and by pressing in an appropriate amount of lubricating oil, the bolts between the flanges can be fully lubricated.

[0015] Furthermore, the tip of the injection needle is bevel-shaped and internally provided with an oil passage. The oil passage transmits the lubricating oil at the grease injection head to the tip of the injection needle. The bevel-shaped needle tip can penetrate deep into the flange, adding lubricating oil to the parts that are not easily lubricated when directly dripping.

[0016] Furthermore, one end of the injection needle is provided with a receiving cavity communicating with the oil passage, and the receiving cavity is clamped with the grease injection head and kept sealed. The receiving cavity enables the injection needle to be clamped with the grease injection head while keeping it sealed, preventing the lubricating oil from flowing out through the gap and causing waste.

[0017] Compared with the prior art, the present utility model has the following beneficial effects: By connecting the perforated link plates with the connecting link plates and surrounding the outside of the flange, fixing the positions of the grease injection head and the injection needle, the lubricating oil can be quickly and efficiently injected into the bolts between the flanges, improving the maintenance effect of the bolts between the flanges, extending the service life of the bolts, and eliminating potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the device for maintaining the bolts between flanges of the present utility model;

[0020] Figure 2 It is a schematic diagram of the connecting link plate of the device for maintaining the bolts between flanges of the present utility model;

[0021] Figure 3 It is a schematic diagram of the perforated link plate of the device for maintaining the bolts between flanges of the present utility model;

[0022] Figure 4 It is a schematic diagram of the tightening link plate of the device for maintaining the bolts between flanges of the present utility model;

[0023] Figure 5 Schematic diagram of the tension rod of the bolt maintenance device between flanges of the present utility model;

[0024] Figure 6 Cross-sectional view of the injection needle of the bolt maintenance device between flanges of the present utility model;

[0025] Explanation of reference numerals in the drawings:

[0026] 1. Connecting link plate; 11. First connecting part; 12. Second connecting part; 2. Perforated link plate; 21. Fixed hole; 3. Grease injection head; 4. Injection needle; 41. Oil passage; 42. Accommodation cavity; 5. Connecting key; 6. Tension rod; 7. Tightening link plate; 71. Installation card slot; 72. Installation hole. Detailed implementation manners

[0027] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be further introduced in detail below with reference to the accompanying drawings.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined. In addition, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0031] Embodiment 1

[0032] As Figure 1 shown, the bolt maintenance device between flanges in this embodiment includes multiple groups of connecting link plates 1, a grease injection head 3, and an injection needle 4. The multiple groups of connecting link plates 1 are connected end to end to form an annular structure that can be wound around the outer circumference of the flange. Fixing holes 21 are provided on some of the connecting link plates 1, and the grease injection head 3 is installed on the fixing holes 21 and connected to the injection needle 4.

[0033] To install the grease injection head and the injection needle, fixing holes 21 are provided on some of the connecting link plates 1 to form perforated link plates 2, where the positions of the fixing holes 21 correspond one-to-one to the positions of the bolts that need lubrication maintenance. For flanges of different sizes, different numbers of connecting link plates 1 and perforated link plates 2 are selected for connection, and they are connected into an arc shape to facilitate fitting on the outer side of the flange. The maintenance personnel align the grease gun with the grease injection head 3 on the fixing hole 21 and inject lubricating oil into the device. The lubricating oil enters the interior of the flange through the grease injection head 3 and the injection needle 4, and then flows to the bolts between the flanges. When the flange is large in size and the number of bolts that need maintenance is large, multiple groups of perforated link plates 2, grease injection heads 3, and injection needles 4 can be set to facilitate injecting lubricating oil into multiple positions inside the flange at the same time; or rotate the bolt maintenance device between flanges as a whole along the circumferential direction of the flange to adjust the relative position of the perforated link plate 2 and the flange, so as to add lubricating oil to the bolts between the flanges at different positions. The bolt maintenance device between flanges in this embodiment has a simple structure and is easy to install, can efficiently and conveniently inject lubricating oil into the bolts between the flanges, avoids the problem of insufficient lubrication that often occurs during the maintenance of bolts on large-sized flanges, has a good bolt maintenance effect, extends the service life, and avoids potential safety hazards of oil and gas leakage.

[0034] In this embodiment, the connecting link plate 1 and the perforated link plate 2 are provided with a first connecting portion 11 on one side and a second connecting portion 12 on the other side. The first connecting portion 11 of the connecting link plate 1 is movably connected to the second connecting portion 12 of the adjacent connecting link plate 1 or perforated link plate 2. The first connecting portion 11 is a claw, and the second connecting portion 12 is a clamping groove, or the first connecting portion 11 is a clamping groove and the second connecting portion 12 is a claw, and the claw is connected to the clamping groove. The number of the connecting link plates 1 and the perforated link plates 2 can be selected according to the size of the flange. By using the cooperation of the clamping groove and the claw on the first connecting portion 11 and the second connecting portion 12 for connection, when connecting adjacent connecting link plates 1 or perforated link plates 2, the claw can be directly buckled onto the clamping groove. The installation operation is fast, and the forming process of the clamping groove and claw structure is simple, and the production cost is low.

[0035] The working principle of the bolt maintenance device between flanges in this embodiment is as follows: First, align the first connecting portion 11 of the connecting link plate 1 with the second connecting portion 12 of the adjacent connecting link plate 1 or perforated link plate 2, and then buckle the claw and the clamping groove. After the connecting link plate 1 and the perforated link plate 2 are connected into a ring shape, they are sleeved outside the flange. Finally, the grease injection head 3 connected with the injection needle 4 is installed on the fixing hole 21 of the perforated link plate 2, and the injection needle 4 extends into the bolt connection part inside the flange. The grease gun is aligned with the grease injection head 3 and lubricating oil is injected into the bolts between the flanges.

[0036] Embodiment 2

[0037] This embodiment is similar to Embodiment 1. The difference is that the bolt maintenance device between flanges in this embodiment further includes a connecting key 5. Both the first connecting portion 11 and the second connecting portion 12 are provided as connecting holes, and the connecting key 5 passes through the first connecting portion 11 and the second connecting portion 12. As Figure 2 、 Figure 3 shown, the first connecting portion 11 is arc-shaped and is provided with a long strip-shaped connecting hole inside; the second connecting portion 12 is two groups of arc-shaped connecting holes arranged separately, and the distance between the two groups of connecting holes is equal to the length of the first connecting portion 11. The connecting key 5 passes through the first connecting portion 11 and the second connecting portion 12 to fix the positions of the adjacent connecting link plates 1 and the perforated link plates 2. The connecting key 5 is rotatably connected to the first connecting portion 11 and the second connecting portion 12, and the connecting link plate 1 and the perforated link plate 2 can rotate relative to each other, fitting more closely to the outer peripheral surface of the flange and avoiding the offset of the device position during the lubrication process.

[0038] The working principle of the bolt maintenance device between flanges in this embodiment is as follows: When assembling the bolt maintenance device between flanges, first align the first connecting portion of the connecting link plate 1 with the second connecting portion 12 of the adjacent connecting link plate 1 to ensure that the central axes of the connecting holes coincide, and then insert the connecting key 5 into the connecting holes to complete the fixation between the adjacent connecting link plates 1. Repeat the operation to combine multiple groups of connecting link plates 1 into a circular ring that can be sleeved outside the flange.

[0039] Embodiment 3

[0040] This embodiment is similar to the first embodiment. The difference lies in that the bolt maintenance device between flanges in this embodiment further includes a tension rod 6. One end of the tension rod 6 is connected to the first connection part 11, and the other end is connected to the second connection part 12. The tension rod 6 is arranged between two adjacent connecting chain plates 1 or perforated chain plates 2, and both ends are respectively inserted into the first connection part 11 and the second connection part 12. For the whole tensioning device, each chain plate is attached to the outer side of the flange, maintaining a tensioned state, providing a good fixing effect, not falling off the flange, and ensuring the stable progress of the bolt maintenance work.

[0041] As Figure 4 shown, the bolt maintenance device between flanges further includes a tightening chain plate 7 provided with a plurality of installation slots 71. One end of the tightening chain plate 7 is provided with an installation hole 72. The connecting key 5 passes through the installation hole 72 and is connected to the second connection part 12. One end of the tension rod 6 is connected to the first connection part 11, and the other end is clamped with the installation slot 71. One end of the tightening chain plate 7 is connected to the connecting chain plate 1 or the perforated chain plate 2 through the installation hole 72 and the connecting key 5, and the other end is provided with a plurality of installation slots 71 that cooperate with the tension rod 6. The overall tension of each chain plate can be adjusted according to the size of the flange, ensuring that the device can be applied to flanges of various sizes and providing a good lubrication and maintenance effect for the bolt pairs therein.

[0042] As Figure 5 shown, the tension rod 6 is U-shaped, the installation slot 71 is arc-shaped and the distance between adjacent installation slots 71 is less than the width of the connecting chain plate 1. One end of the U-shaped tension rod 6 is inserted into the first connection part 11 on the connecting chain plate 1, and the other end is clamped with the installation slot 71. The U-shaped tension rod 6 can rotate in the first connection part 11 and the installation slot 71, and the installation is convenient and fast. The distance between each installation slot 71 should be less than the width of the connecting chain plate 1. By setting multiple groups of installation slots 71 with a smaller distance, a variety of selectable tensioning forces are provided for the whole device, adapting to flanges of various sizes and scales.

[0043] The working principle of the bolt maintenance device between flanges in this embodiment is as follows: Align the installation hole 72 on the tightening chain plate 7 with the second connection part 12 on the connecting chain plate 1, then insert the connecting key 5 to fix it. Then insert one end of the tension rod 6 into the first connection part 11 of the adjacent connecting chain plate 1, and select and clamp the other end with the installation slot 71 at a suitable position on the tightening chain plate 7 according to the size of the flange to adjust different tensioning forces to ensure that the device closely adheres to the flange.

[0044] Embodiment Four

[0045] This embodiment is similar to Embodiment 1, except that the grease injection head 3 in this embodiment is a straight-through grease injection cup. The outer wall of the straight-through grease injection cup is provided with threads and is adapted to various types of grease guns. Inside, there is a compression spring and a sealing ball. When injecting lubricating oil, under the action of the internal lubricating oil pressure, the compression spring is compressed, the sealing ball separates from the oil outlet hole, and the lubricating oil enters the injection needle 4. After the injection is completed, the compression spring bounces the sealing ball upwards, and the top of the sealing ball can cooperate with the oil outlet hole to seal the oil outlet hole, ensuring that the lubricating oil does not leak. The straight-through grease injection cup has a good oil injection effect and is suitable for many applications, and is suitable for maintaining bolts between flanges.

[0046] As Figure 6 shown, the tip of the injection needle 4 is beveled and there is an oil passage 41 inside. The beveled tip of the injection needle 4 can penetrate into the flange, facilitating the injection of lubricating oil to each bolt between flanges that was originally not easily lubricated, enhancing the maintenance effect. The internal oil passage 41 connects the tip of the needle to the grease injection head 3, ensuring the smooth flow of lubricating oil in the injection needle 4.

[0047] One end of the injection needle 4 is provided with a receiving cavity 42 communicating with the oil passage 41. The receiving cavity 42 is snap-connected to the grease injection head 3 and keeps it sealed. The receiving cavity 42 is snap-connected to one end of the grease injection head 3 to ensure the stable connection between the injection needle 4 and the grease injection head 3. At the same time, the receiving cavity 42 also needs to ensure the sealing effect at the connection, avoiding liquid leakage during injection.

[0048] The working principle of the bolt maintenance device between flanges in this embodiment is as follows: Install the straight-through grease injection cup on the fixing hole 21, connect the oil inlet end to the grease gun, and the oil outlet end is snap-connected to the receiving cavity 42 on the injection needle 4. When the grease gun injects lubricating oil, the lubricating oil pushes the sealing ball open, flows from the oil outlet hole into the internal oil passage 41 of the injection needle 4, and finally enters the bolt connection between the flanges for lubrication and maintenance.

[0049] In the specific content of the above specific implementation manner, each technical feature can be combined arbitrarily without contradiction. For the sake of concise description, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features does not exist in contradiction, it should be considered as within the scope described in this specification.

[0050] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A flange bolt maintenance device, characterized in that: The invention comprises a plurality of groups of connecting chain plates (1), grease injection heads (3) and injection needles (4); the plurality of groups of connecting chain plates (1) are connected end to end to form a circular ring structure that can be wound around the outer circumference of a flange; a fixing hole (21) is provided on some of the connecting chain plates (1); the grease injection heads (3) are installed on the fixing holes (21) and are connected to the injection needles (4).

2. The flange bolt maintenance device according to claim 1, characterized in that: The connecting chain plate (1) is provided with a first connecting portion (11) on one side and a second connecting portion (12) on the other side, and the first connecting portion (11) of the connecting chain plate (1) is movably connected to the second connecting portion (12) of the adjacent connecting chain plate (1).

3. The flange bolt maintenance device according to claim 2, characterized in that: The first connecting portion (11) is a claw, and the second connecting portion (12) is a slot; or the first connecting portion (11) is a slot, and the second connecting portion (12) is a claw, and the claw is connected to the slot.

4. The flange bolt maintenance device according to claim 2, characterized in that: The inter-flange bolt maintenance device also includes a connecting key (5), the first connecting portion (11) and the second connecting portion (12) are both connecting holes, and the connecting key (5) passes through the first connecting portion (11) and the second connecting portion (12).

5. The flange bolt maintenance device according to claim 4, characterized in that: The inter-flange bolt maintenance device also includes a tension rod (6), one end of which is connected to the first connecting portion (11), and the other end of which is connected to the second connecting portion (12).

6. The flange bolt maintenance device according to claim 5, characterized in that: The inter-flange bolt maintenance device also includes a tightening chain plate (7) provided with a plurality of mounting slots (71), one end of the tightening chain plate (7) is provided with a mounting hole (72), the connecting key (5) passes through the mounting hole (72) and is connected to the second connecting portion (12), one end of the tensioning rod (6) is connected to the first connecting portion (11), and the other end is engaged with the mounting slot (71).

7. The flange bolt maintenance device according to claim 6, characterized in that: The tension rod (6) is U-shaped, the mounting slots (71) are arc-shaped, and the spacing between adjacent mounting slots (71) is smaller than the width of the connecting chain plate (1).

8. The flange bolt maintenance device according to any one of claims 1 to 7, characterized in that: The grease injection head (3) is a straight-through pressure oil injection cup.

9. The flange bolt maintenance device according to any one of claims 1 to 7, characterized in that: The tip of the injection needle (4) is in a bevel shape and an oil channel (41) is provided inside.

10. The flange bolt maintenance device according to claim 9, characterized in that: One end of the injection needle (4) is provided with a receiving chamber (42) which is in communication with the oil passage (41); the receiving chamber (42) is clamped with the grease injection head (3) and remains sealed.

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