Flange separating tool

Abstract

The utility model relates to the technical field of tools for disassembling butt flanges, in particular to a flange separating tool which comprises a frame body, a separator is arranged on the frame body, the separator is provided with a separating head, more than two pre-positioning pieces are arranged on the frame body, at least one pre-positioning piece is a movable pre-positioning piece, and the separating head is provided with a separating head. Each pre-positioning piece is provided with a positioning end used for abutting against the joint of two flanges, and the movable pre-positioning piece is provided with a fixing position enabling the positioning end of the movable pre-positioning piece to abut against the joint so that the flange separation tool can be pre-fixed to the flanges through cooperation of the positioning ends of the pre-positioning pieces and an avoiding position retreating from the joint in the movable stroke of the movable pre-positioning piece. The pre-positioning pieces are used for abutting against the joint of the two flanges, pre-fixing of the flange separation tool at the butt joint of the two flanges can be achieved, the joint of the two flanges is used as the positioning reference for pre-fixing of the tool, therefore, the separation head is aligned with the joint, an operator does not need to hold the tool with hands to keep the position of the tool, and the working efficiency is improved. And the use convenience of the flange separation tool is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tools for disassembling butt flanges, in particular to a flange separation tool. Background Art

[0002] In the middle and late stages of oilfield exploitation, high-pressure water injection wells are used to inject water into the formation to supplement energy. The wellhead device of the water injection well is composed of various valves and short joints, and the overall weight is relatively large. Usually, the various parts of the wellhead device are connected by flanges. For example, the lower end of the main valve of the wellhead device of the water injection well is connected to the central pipe of the large four-way below through a flange, and the flanges of the two components are fixedly connected by bolts and nuts. In the process of water injection production practice, due to geological well closure and long-term non-operation, some flange connections have not been disassembled for more than ten years or even decades. If leakage occurs, due to the long-term non-disassembly of the flange, the flange and the bolts and the two flanges connected will be stuck and rusted, and the two flanges connected together cannot be separated by conventional disassembly of the bolts and nuts. The conventional method is to cut off the nut first, then use a chisel to plug it into the joint of the two flanges, and then use a large hammer to hit the chisel to separate the two flanges, and then use hoisting means to lift the corresponding components away. On the one hand, this method is time-consuming and labor-intensive. On the other hand, the flange often cannot be opened due to severe rust, which leads to the scrapping of the wellhead device of the water injection well.

[0003] There are also tools in the prior art that are used to separate flanges by arranging multiple hydraulic jacks along the circumferential direction on an annular frame. A wedge-shaped head is arranged at the end of the push rod of the hydraulic jack so that the wedge-shaped head enters between the two flanges from the joint of the two flanges when the push rod is extended, thereby separating the two flanges. The hydraulic jack constitutes a separator and the wedge-shaped head constitutes a separation head. When using this tool, in order to align the separation head with the joint of the two flanges, an operator is required to hold the tool beside the flange to maintain the position of the tool during the process of the separation head moving into the joint. This is inconvenient to operate, and there are also safety risks for the operator when the flanges are separated. Utility Model Content

[0004] The utility model aims to provide a flange separation tool to solve the problem that the existing flange separation tool needs an operator to hold the tool to keep the separation head corresponding to the joints of two flanges, which affects the convenience of operation.

[0005] The technical solution of the flange separation tool of the utility model is:

[0006] A flange separation tool comprises a frame for being sleeved on the outer periphery of a flange, a separator being provided on the frame, the separator having a separation head for extending from a joint between two flanges to separate the two flanges, more than two pre-positioning members being provided on the frame around its center line, at least one pre-positioning member being a movable pre-positioning member, each pre-positioning member having a positioning end for pressing against the joint between the two flanges, and the movable pre-positioning member having a fixed position in its movable stroke in which its positioning end is pressed against the joint so as to pre-fix the flange separation tool on the flange through the cooperation of the positioning ends of each pre-positioning member, and an avoidance position for withdrawing from the joint.

[0007] Furthermore, the movable pre-positioning member is a top screw threadedly connected to the frame.

[0008] Furthermore, the positioning end of the top screw is a conical structure.

[0009] Furthermore, each separator and each pre-positioning member is evenly distributed around the center line.

[0010] Furthermore, each pre-positioning member is a movable pre-positioning member.

[0011] Furthermore, the separator is a hydraulic cylinder having a telescopic rod, and the end of the telescopic rod is provided with the separation head.

[0012] Furthermore, the frame includes two split parts which are separately arranged around the center line thereof, the two split parts are detachably connected, and the two split parts are used to enclose a central cavity of the frame for accommodating the flange.

[0013] Furthermore, the frame also includes a connecting block, and the ends of the two split parts close to each other are connected to the connecting block through fasteners.

[0014] Furthermore, the split part includes two plates facing each other along the center line of the frame, and the connecting block has a portion extending into between the two plates and the fastener is installed on the portion.

[0015] Furthermore, a fixing block is fixed between the two plates of the split part, the pre-positioning member is arranged on the fixing block, and the separator is arranged on the connecting block.

[0016] Beneficial effect: The utility model is an improvement on the flange separation tool in the prior art. By arranging various pre-positioning parts on the frame, after the frame is sleeved on the outer periphery of the flange, the positioning end of the movable pre-positioning part can be used to press against the joint of the two flanges. The positioning end is subjected to force, and then the positioning ends of the remaining pre-positioning parts are also pressed against the joint. By using the pre-positioning parts to press against the joint of the two flanges, the flange separation tool can be pre-fixed at the joint of the two flanges. The joint of the two flanges is used as a positioning reference for pre-fixing the tool, so that the separation head is aligned with the joint. There is no need for the operator to use his hands to maintain the position of the tool, which improves the convenience of using the flange separation tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the flange separation tool of the utility model;

[0018] Figure 2 for Figure 1 Cross-sectional view of the flange separation tool in .

[0019] In the figure: 1, first split part; 11, first plate body; 12, second plate body; 2, second split part; 3, connecting block; 4, fixing block; 5, connecting bolt; 6, top screw; 7, hydraulic cylinder; 71, wedge head; 72, quick connector. DETAILED DESCRIPTION

[0020] The utility model is improved on the basis of the flange separation tool in the prior art. By arranging various pre-positioning parts on the frame, after the frame is sleeved on the outer periphery of the flange, the positioning end of the movable pre-positioning part can be used to press against the joint of the two flanges, the positioning end is stressed, and then the positioning ends of the remaining pre-positioning parts are also pressed against the joint. By using the pre-positioning parts to press against the joint of the two flanges, the flange separation tool can be pre-fixed at the joint of the two flanges, and the joint of the two flanges is used as the positioning reference for the pre-fixation of the tool, so that the separation head is aligned with the joint, and the operator does not need to hold the tool with his hands to maintain the position of the tool, which improves the convenience of using the flange separation tool. Moreover, when the separator is working to separate the flange, the operator can stay away from the flange part, which is beneficial to safety.

[0021] Embodiment of the flange separation tool of the utility model:

[0022] like Figure 1 and Figure 2 As shown, the flange separation tool includes a frame, a pre-positioning member and a separator arranged on the frame, the pre-positioning member is a top screw 6, each pre-positioning member is a movable pre-positioning member, the separator is a hydraulic cylinder 7, the frame is generally a circular frame, the frame has a central cavity running through along its center line for accommodating the flange, two top screws 6 are provided and are evenly distributed around the center line of the frame, two hydraulic cylinders 7 are provided and are evenly distributed around the center line of the frame, the relative direction of the two top screws 6 is perpendicular to the relative direction of the two hydraulic cylinders 7, so that each separator and each pre-positioning member are staggered around the center line. The two top screws 6 can be used to press on the joint of the two flanges to pre-position the flange separation tool, and then the two hydraulic cylinders 7 are used to separate the two flanges.

[0023] The frame includes two split parts arranged around its center line, the two split parts are respectively a first split part 1 and a second split part 2, the first split part 1 and the second split part 2 are symmetrically arranged, and the two split parts have the same structure. Taking the first split part 1 as an example, the first split part 1 includes a first plate body 11 and a second plate body 12 opposite to each other along the center line direction of the frame body, and a fixing block 4 fixed between the first plate body 11 and the second plate body 12, the fixing block 4 is welded and fixed to the first plate body 11 and the second plate body 12, and the plate body is an arc-shaped steel plate. Thus, both split parts have two opposite plates and a fixing block 4 fixed between the two plates, the fixing block 4 is provided with a threaded hole, the top screw 6 is threadedly connected in the threaded hole of the fixing block 4, the top screw 6 has a positioning end extending into the central cavity of the frame body, the positioning end is used to press on the joint of the two flanges, and the positioning end of the top screw 6 is a conical structure, so as to be inserted into the joint to form a reliable fixation.

[0024] The projection shape of the first split part 1 and the second split part 2 in the direction of the center line of the frame is generally arc-shaped. The first split part 1 and the second split part 2 are used to enclose a central cavity of the frame for accommodating the flange. The two split parts are detachably connected. The frame also includes a connecting block 3. The adjacent ends of the first split part 1 and the second split part 2 are connected by two connecting blocks 3 respectively. The connecting block 3 has a first split part 1 extending between the two plates of the first split part 1 and a second split part 2 extending between the two plates of the second split part 2. The first split part 1 and The second split part 2 is provided with bolt through holes, and the two plates of the split part are respectively provided with corresponding bolt through holes. Connecting bolts 5 are respectively installed through the bolt through holes in the first split part 1 and the bolt through holes of the first split part 1 of the connecting block 3, the bolt through holes in the second split part 2 and the bolt through holes in the second split part 2 of the connecting block 3, so that the two connecting blocks 3 and the two split parts are connected together in cooperation with nuts. The connecting bolts 5 constitute corresponding fasteners, and the ends of the two split parts close to each other are connected to the connecting block 3 through corresponding fasteners.

[0025] The hydraulic cylinder 7 includes a cylinder body and a telescopic rod. The cylinder body is fixed on the connection block 3 and fixed on a side surface of the connection block 3 away from the center line of the frame. The connection block 3 is provided with an avoidance hole for the telescopic rod to extend into the central cavity of the frame. The end of the telescopic rod is provided with a separation head for extending from the joint of the two flanges to separate the two flanges. The separation head is a wedge-shaped head 71. The separation head is made of tungsten steel and welded to the end of the telescopic rod. The cylinder body of the hydraulic cylinder 7 is provided with a quick connector 72 to connect a manual hydraulic pump through a high-pressure pipeline.

[0026] The top screw 6 can be made to move relative to the frame by screwing it. The top screw 6 has a fixed position in its movable stroke, where its positioning end is pressed against the joint of the two flanges to pre-fix the flange separation tool on the flange through the positioning end of each top screw 6, and an escape position for withdrawing from the joint. When the top screw 6 is in the escape position, the tool can be easily moved. The top screw 6 is matched with the fixing block 4 through a trapezoidal thread. The outer end of the top screw 6 is provided with a hexagonal body for easy operation of a wrench.

[0027] When in use, one of the connecting bolts 5 can be removed to open the frame, and then the frame can be put on the outer periphery of the flange and then the connecting bolts 5 can be installed. It can also be directly put on the outer periphery of the flange if space permits, and the top screw 6 can be rotated with a wrench to push the inner end cone of the top screw 6 into the joint between the two flanges. The tool can be fixed on the flange, and then the high-pressure oil pipe of the manual hydraulic pump can be connected to the quick connector 72 of the hydraulic cylinder 7; operate the manual hydraulic pump to work, and the wedge-shaped head 71 at the end of the telescopic rod of the hydraulic cylinder 7 is inserted into the joint between the two flanges, and the two flanges are opened by relying on the huge hydraulic pressure. The hydraulic pressure of the hydraulic cylinder 7 can be used to adapt to the large four-way flange at the wellhead that is difficult to disassemble. When opening the two flanges, the operator can stay away from the wellhead, and the operation is simple, convenient and safe.

[0028] In other implementations, only one movable pre-positioning member may be provided, and the other pre-positioning members may be fixed on the frame.

[0029] In other embodiments, the movable pre-positioning member can also be a positioning rod, which is movably inserted into the through hole of the fixed block. The positioning rod is provided with a radially through positioning hole, and the frame is provided with a pin hole corresponding to the positioning hole. When the positioning end of the positioning rod is pushed into the joint, the positioning hole corresponds to the pin hole, and the positioning rod is limited by inserting the pin.

[0030] In other embodiments, the top screw includes a screw body and a wedge-shaped body rotatably mounted at the end of the screw body, and the wedge-shaped body constitutes a positioning end.

[0031] In other embodiments, three pre-positioning members may be provided, and two of the pre-positioning members may be provided as movable pre-positioning members.

[0032] In other implementations, the separator may also be an electric push rod or a cylinder.

[0033] In other implementations, the frame may also be an integral structure, which is applicable to the case where it is directly sleeved on the periphery of the flange from one axial side of the flange.

[0034] In other implementations, the split portion may also be an arc-shaped body with a uniform thickness at all locations, and a connecting ear is provided on the connecting block, and the connecting ear and the arc-shaped body are connected together by connecting bolts.

[0035] In other implementations, a mounting block may be additionally fixedly disposed between the two plates of the split portion, so that the separator is mounted on the mounting block.

[0036] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A flange separation tool, comprising a frame for sleeved around the outer periphery of a flange, a separator provided on the frame, the separator having a separation head for extending from the joint of the two flanges into between the two flanges to separate the two flanges, characterized in that: The frame is provided with more than two pre-positioning members around its center line, at least one of which is a movable pre-positioning member, and each of which has a positioning end for pressing against the joint between the two flanges. The movable pre-positioning member has a fixed position in its movable stroke in which its positioning end is pressed against the joint so that the flange separation tool is pre-fixed on the flange through the cooperation of the positioning ends of each pre-positioning member, and an avoidance position for withdrawing from the joint.

2. The flange separation tool according to claim 1, characterized in that: The movable pre-positioning member is a top screw threadedly connected to the frame.

3. The flange separation tool according to claim 2, characterized in that: The positioning end of the top screw is a conical structure.

4. The flange separation tool according to claim 1, 2 or 3, characterized in that: The separators and pre-positioning members are evenly distributed around the center line.

5. The flange separation tool according to claim 1, 2 or 3, characterized in that: Each pre-positioning member is a movable pre-positioning member.

6. The flange separation tool according to claim 1, 2 or 3, characterized in that: The separator is a hydraulic cylinder having a telescopic rod, and the end of the telescopic rod is provided with the separation head.

7. The flange separation tool according to claim 1, 2 or 3, characterized in that: The frame body comprises two split parts which are separately arranged around the center line thereof, the two split parts are detachably connected, and the two split parts are used to enclose a central cavity of the frame body for accommodating a flange.

8. The flange separation tool according to claim 7, characterized in that: The frame also includes a connecting block, and the ends of the two split parts close to each other are connected to the connecting block through fasteners.

9. The flange separation tool according to claim 8, characterized in that: The split part comprises two plates which are opposite to each other along the center line of the frame body, and the connecting block has a part which extends into between the two plates and the fastener is installed on the part.

10. The flange separation tool according to claim 9, characterized in that: A fixing block is fixed between the two plates of the split part, the pre-positioning piece is arranged on the fixing block, and the separator is arranged on the connecting block.

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