A pipe flange expander

Abstract

This utility model discloses a pipe flange expander, relating to the field of mechanical component technology. It includes a left threaded rod with a right threaded rod fixed to one end. The threads of the left and right threaded rods are opposite in direction. A main rotating nut is fixed at the connection between the left and right threaded rods. A left expansion component is screwed onto the left threaded rod, and a right expansion component is screwed onto the right threaded rod. An extension screw is connected to one end of the right threaded rod, with a rectangular insertion hole at one end and a rectangular insertion rod at the other end. The rectangular insertion hole and the rectangular insertion rod form a tight insertion fit. A sleeve nut is screwed externally to the connection between the right threaded rod and the extension screw. The right threaded rod and the extension screw have the same dimensions and thread direction. This utility model uses threaded transmission to achieve slow expansion and retraction, avoiding hydraulic overload damage to the pipeline. It is particularly suitable for old or corroded pipelines. After expansion, it does not affect disassembly and assembly, facilitating operations such as gasket replacement.

Description

Technical Field

[0001] This utility model relates to the field of mechanical component technology, and in particular to a pipe flange expander. Background Technology

[0002] Existing pipe flange expanders can be divided into two types:

[0003] One type is a hydraulic flange expansion device that is locked onto the pipe and uses the locking device and friction with the pipe surface to expand the flange. This type of expansion device can be used for the disassembly and installation of pipeline equipment, but it is too damaging to the pipe and can easily cause the pipe to burst. It is especially unsuitable for old equipment and pipes with some corrosion. In addition, the hydraulic expansion device does not have overload protection and can easily damage the pipe.

[0004] The second type is a hydraulic expander used between flanges that can only expand for equipment installation. This type of expander has limited application and cannot assist in the disassembly of equipment. Also, because its installation requires a certain fit with the flange, the opening of the expanded pipe is too large during installation, which can easily damage the pipe or can only be used for pipes with high mobility and flexibility. After installation, the expander is not easy to remove. Therefore, a pipe flange expander is provided. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a pipe flange expander that uses threaded drive to achieve slow expansion and retraction, avoiding damage to the pipe from hydraulic overload. It is especially suitable for old or corroded pipes. After expansion, it does not affect disassembly and assembly, and facilitates operations such as gasket replacement, thus overcoming the deficiencies of existing technologies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pipe flange expander includes a left threaded rod, one end of which is fixed with a right threaded rod. The threads of the left and right threaded rods are in opposite directions. A main rotating nut is fixed at the connection between the left and right threaded rods. A left expansion member is screwed onto the left threaded rod, and a right expansion member is screwed onto the right threaded rod. One end of the right threaded rod is connected to an extension screw.

[0008] As a further embodiment of this utility model: one end of the extension screw is provided with a rectangular insertion hole, and one end of the right threaded rod is provided with a rectangular insertion rod, the rectangular insertion hole and the rectangular insertion rod forming a tight insertion fit.

[0009] As a further improvement of this utility model: a sleeve nut is externally screwed at the connection between the right threaded rod and the extension screw.

[0010] As a further embodiment of this utility model: the right threaded rod and the extension screw have the same dimensions and thread direction, and both the right threaded rod and the extension screw are threadedly engaged with the sleeve nut.

[0011] As a further improvement of this utility model: the top ends of the left expansion member and the right expansion member are provided with push feet, and the bottom ends of the left expansion member and the right expansion member are provided with striking parts.

[0012] As a further improvement of this utility model: the bottom ends of both the left and right expansion members are movably connected to support rods, and one end of the support rod is connected to an extension rod.

[0013] As a further improvement of this utility model: one end of the support rod is provided with a bolt, and one end of the extension rod is provided with a screw hole, with the bolt and the screw hole forming a screwed connection.

[0014] The beneficial effects of this utility model are as follows:

[0015] The threaded drive enables slow expansion and contraction, avoiding damage to the pipeline from hydraulic overload. It is especially suitable for old or corroded pipelines. After expansion, it does not affect disassembly and assembly, and facilitates operations such as gasket replacement. Attached Figure Description

[0016] Figure 1 This is a first-view three-dimensional structural diagram of a pipe flange expander proposed in this utility model.

[0017] Figure 2 This is a second-view three-dimensional structural diagram of a pipe flange expander proposed in this utility model.

[0018] Figure 3 This is a partial structural diagram from a third-view perspective of a pipe flange expander proposed in this utility model.

[0019] Figure 4 This utility model proposes a pipe flange expander. Figure 3 Enlarged structural diagram at point A in the middle.

[0020] In the diagram: 1. Left threaded rod; 2. Support rod; 3. Left expansion member; 4. Main rotating nut; 5. Socket nut; 6. Extension rod; 7. Right threaded rod; 8. Extended rod; 9. Right expansion member; 10. Bolt; 11. Push foot; 12. Striking part; 13. Rectangular insert; 14. Screw hole; 15. Rectangular insertion hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1, referring to Figure 1-4 A pipe flange expander includes a left threaded rod 1, a right threaded rod 7 fixed to one end of the left threaded rod 1, the threads of the left threaded rod 1 and the right threaded rod 7 having opposite directions, a main rotating nut 4 fixed at the connection between the left threaded rod 1 and the right threaded rod 7, a left expansion member 3 screwed onto the left threaded rod 1, a right expansion member 9 screwed onto the right threaded rod 7, and an extension screw 6 connected to one end of the right threaded rod 7.

[0023] One end of the extension screw 6 is provided with a rectangular insertion hole 15, and one end of the right threaded rod 7 is provided with a rectangular insertion rod 13. The rectangular insertion hole 15 and the rectangular insertion rod 13 form a tight insertion fit.

[0024] A sleeve nut 5 is externally screwed at the connection between the right threaded rod 7 and the extension screw 6.

[0025] The right threaded rod 7 and the extension screw 6 have the same dimensions and thread direction. Both the right threaded rod 7 and the extension screw 6 form a threaded connection with the sleeve nut 5.

[0026] The top of both the left expansion member 3 and the right expansion member 9 is provided with a push foot 11, and the bottom of both the left expansion member 3 and the right expansion member 9 is provided with a striking part 12.

[0027] Align the push feet 11 at the top of the left expansion member 3 and the right expansion member 9 with the middle position of the connection stop between the flanges at both ends of the pipeline equipment and the pipe flange, i.e., the position of the sealing gaskets at both ends. Use a hammer to strike the striking part 12 of the left expansion member 3 and the right expansion member 9 to drive the push feet 11 into the two flanges at both ends. Use a wrench to turn the main rotating nut 4 so that the left expansion member 3 and the right expansion member 9 move axially at the same time, realizing the expansion of the pipeline and the retraction and unloading of the expander. After expansion, the pipeline equipment can be dismantled. After dismantling, the expander does not need to be removed because it will not affect the installation and dismantling of the equipment. Maintain the expansion distance between the pipelines and install the same type of equipment and sealing gasket. After installation, the main rotating nut 4 can be manually turned in the opposite direction to slowly retract the expansion distance.

[0028] After the rectangular insert 13 of the right threaded rod 7 is inserted into the rectangular insert 15 of the extension screw 6, the sleeve nut 5 is tightened to place it at the connection between the right threaded rod 7 and the extension screw 6, thereby extending the right threaded rod 7. The right expansion member 9 can be screwed onto the extension screw 6.

[0029] Example 2 is an optimization based on Example 1, specifically:

[0030] Both the left expansion member 3 and the right expansion member 9 have a support rod 2 movably inserted at their bottom ends, and one end of the support rod 2 is connected to an extension rod 8.

[0031] One end of the support rod 2 is provided with a bolt 10, and one end of the extension rod 8 is provided with a screw hole 14. The bolt 10 and the screw hole 14 form a screw connection.

[0032] The support rod 2 provides support for the axial movement of the left expansion member 3 and the right expansion member 9. The support rod 2 can be extended by screwing the screw hole 14 of the extension rod 8 to the bolt 10 of the support rod 2.

[0033] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A pipe flange expander comprising a left threaded rod (1), characterized in that, One end of the left threaded rod (1) is fixed with a right threaded rod (7). The threads of the left threaded rod (1) and the right threaded rod (7) are opposite. A main rotating nut (4) is fixed at the connection between the left threaded rod (1) and the right threaded rod (7). A left expansion member (3) is screwed onto the left threaded rod (1). A right expansion member (9) is screwed onto the right threaded rod (7). An extension screw (6) is connected to one end of the right threaded rod (7).

2. A pipe flange expander according to claim 1, wherein, One end of the extension screw (6) is provided with a rectangular insertion hole (15), and one end of the right threaded rod (7) is provided with a rectangular insertion rod (13). The rectangular insertion hole (15) and the rectangular insertion rod (13) form a tight insertion fit.

3. A pipe flange expander as defined in claim 2 wherein, A sleeve nut (5) is externally screwed at the connection between the right threaded rod (7) and the extension screw (6).

4. A pipe flange expander as defined in claim 3 wherein, The right threaded rod (7) and the extension screw (6) have the same dimensions and thread direction. Both the right threaded rod (7) and the extension screw (6) are threaded together with the sleeve nut (5).

5. A pipe flange expander as defined in claim 4 wherein, The top ends of the left expansion member (3) and the right expansion member (9) are provided with push feet (11), and the bottom ends of the left expansion member (3) and the right expansion member (9) are provided with striking parts (12).

6. A pipe flange expander as defined in claim 1 wherein, The bottom ends of the left expansion member (3) and the right expansion member (9) are movably connected to a support rod (2), and one end of the support rod (2) is connected to an extension rod (8).

7. A pipe flange expander according to claim 6 wherein, One end of the support rod (2) is provided with a bolt (10), and one end of the extension rod (8) is provided with a screw hole (14). The bolt (10) and the screw hole (14) form a screw connection.

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