Center positioning device for circular tube with irregular end face

Abstract

The utility model relates to the technical field of circle center positioning, in particular to a circle center positioning device for a circular pipe with an irregular end face. Comprising a first V-shaped positioning plate and a second V-shaped positioning plate with a right-angle included angle, the first positioning plate and the second positioning plate are located outside the end of a round pipe, the two side edges of the first positioning plate and the two side edges of the second positioning plate abut against the round pipe, and a first positioning rod extending towards the side of the round pipe is horizontally arranged at the top of the first positioning plate along an angular branching line; and the second positioning rod swings up and down in a plane formed by the angular bisector of the second positioning plate. The first positioning plate and the second positioning plate are used for positioning, the first positioning rod and the second positioning rod are both located on the angular branching line, the first positioning rod serves as a standard rod, the second positioning rod is controlled to swing until the first positioning rod makes contact with the second positioning rod, and the theorem that the angular branching line must pass through the circle center is used for positioning the circle center of the circular pipe with the irregular end face. The whole structure is simple, light and convenient to carry.

Description

Technical Field

[0001] The utility model relates to the technical field of circle center positioning, in particular to a circle center positioning device for a circular tube with an irregular end surface. Background Art

[0002] In construction, there are often first-phase projects and later projects. The first-phase project needs to reserve the pipe interfaces required for the later projects. However, due to changes in time and on-site environment, the reserved pipe interfaces may be damaged. In addition, when the entire pipeline is transported to the construction site, it is often necessary to cut the length of the pipeline on site. The larger the diameter of the pipeline, the more difficult it is for workers to ensure the flatness of the cut pipeline end face. The above situation may cause the reserved pipeline end face to be irregular. With the entry of the later project, it is necessary to measure the diameter of the irregular pipeline interface originally reserved for subsequent pipeline preparation. In addition, the uncertainty of the reserved pipeline end face cutting will also lead to the inability to ensure that the pipeline port is perpendicular to the pipe body when the pipeline is docked, and thus it is impossible to ensure that the pipeline after docking is straight. It is also necessary to use tools to measure the center of the circle so that the pipeline can be corrected before welding to ensure that the pipeline is a straight line. There is also a situation where on-site processing is adopted for the furnace wall of the hot blast furnace. The furnace wall round pipe is assembled by welding with several bent plates. Before welding, the bent plates on the same layer need to be measured to avoid different curvatures. Utility Model Content

[0003] The utility model aims to solve the above problems, thereby providing a simple and light device for locating the center of a circular tube with an irregular end surface.

[0004] The utility model solves the above problems and adopts the following technical solutions:

[0005] A device for locating the center of a circular tube with an irregular end face comprises a first positioning plate and a second positioning plate which are V-shaped and have a right angle therebetween. The first positioning plate and the second positioning plate are respectively located outside the ends of the circular tube and both side edges thereof abut against the circular tube. A first positioning rod extending toward the circular tube side is horizontally arranged along an angular dividing line at the top of the first positioning plate. A second positioning rod is hingedly connected to the top of the second positioning plate. The second positioning rod swings up and down within a plane formed by the angular dividing line of the second positioning plate.

[0006] Compared with the prior art, the utility model adopting the above technical solution has the following outstanding features:

[0007] The first positioning plate and the second positioning plate are used for positioning, the first positioning rod and the second positioning rod are both located on the angular bisector, the first positioning rod is used as a standard rod to control the second positioning rod to swing until the first positioning rod contacts the second positioning rod, and the theorem that the angular bisector must pass through the center of the circle is used to locate the center of the irregular end face circular tube, and the overall structure is simple, light and easy to carry, and the device is also applicable to the measurement of the bent plate of the hot blast furnace, the first positioning plate and the second positioning plate can be placed in different positions to measure the center of the bent plate, to avoid different curvatures of the bent plates on the same layer.

[0008] As a preferred embodiment, a further technical solution of the utility model is:

[0009] Magnetic strips are arranged at positions where the first positioning plate and the second positioning plate are adjacent to the round tube.

[0010] The first positioning rod is provided with scale values.

[0011] A long hole for reading scales is provided on the second positioning rod along the length direction, and the axis of the second positioning rod is located in one side surface of the long hole along the length direction.

[0012] The top surface of the second positioning plate is located above the adjacent end surface of the circular tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the front view structure of the first positioning plate in an embodiment of the utility model;

[0014] Figure 2 This is a schematic diagram of the front view structure of the second positioning plate in an embodiment of the utility model;

[0015] Figure 3 This is a schematic diagram of the top view of the second positioning plate in an embodiment of the utility model;

[0016] Figure 4 This is a schematic diagram of the main structure of the embodiment of the utility model when working;

[0017] Figure 5 It is a schematic diagram of the three-dimensional structure of the embodiment of the utility model when working;

[0018] Marked in the figure are: first positioning plate 1, second positioning plate 2, first positioning rod 3, second positioning rod 4, magnetic strip 5, long hole 6, round tube 7, fixing seat 8. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0020] A center positioning device for a circular tube with an irregular end face, comprising a first positioning plate 1 and a second positioning plate 2 which are V-shaped and have a right angle, the first positioning plate 1 and the second positioning plate 2 being made of angle steel, and the two sides of the angle steel being of equal width, the first positioning plate 1 and the second positioning plate 2 being respectively located outside the ends of the circular tube 7 and the two side edges thereof being against the circular tube 7, the first positioning plate 1 and the second positioning plate 2 being longitudinally arranged and opening inward, a first positioning rod 3 extending toward the side of the circular tube 7 being horizontally arranged along the bisector line at the top of the first positioning plate 1, the first positioning rod 3 being welded and fixed to the first positioning plate 1, the first positioning rod 3 being located on the bisector line so as to pass through the center of the circular tube 7, a second positioning rod 4 being hinged on the top of the second positioning plate 2, a fixing seat 8 being welded at the inner corner of the top of the second positioning plate 2, the second positioning rod 4 being hinged in the fixing seat 8 by a pin shaft, the second positioning rod 4 swinging up and down in the plane formed by the bisector line of the second positioning plate 2, so when the second positioning rod 4 swings to contact with the first positioning rod 3, this point is the center of the circular tube 7.

[0021] A magnetic strip 5 is provided at a position where the first positioning plate 1 and the second positioning plate 2 are adjacent to the circular tube 7. The circular tube 7 is made of metal material. The first positioning plate 1 and the second positioning plate 2 are adsorbed on the circular tube 7 by the magnetic strip 5 to avoid the need for manual support.

[0022] The first positioning rod 1 is provided with a scale value, and the pipe diameter is calculated by the scale difference between the center of the circle and the pipe wall.

[0023] The second positioning rod 4 is provided with a long hole 6 along the length direction for reading the scale. The long holes 6 are arranged at intervals to prevent the second positioning rod 4 from deformation. The first positioning rod 1 is provided with a plurality of scale values ​​along the outer circumference in the length direction to facilitate cooperation with the second positioning rod 4 at different positions. The axis of the second positioning rod 4 is located in one of the side surfaces of the long hole 6 along the length direction. The scale value on the first positioning rod 1 is observed through the long hole 6 to read the scale adjacent to the inner side of the long hole 6.

[0024] The top surface of the second positioning plate 2 is located above the end surface of the adjacent circular tube 7 to prevent the second positioning rod 4 from contacting the wall of the tube 7 when swinging downward.

[0025] The first positioning plate 1 and the second positioning plate 2 are positioned, the first positioning rod 2 and the second positioning rod 4 are both located on the bisector, the first positioning rod 2 is used as a standard rod to control the second positioning rod 4 to swing until the first positioning rod 3 contacts the second positioning rod 4, and the theorem that the bisector must pass through the center of the circle is used to locate the center of the irregular end face circular tube 7, and the overall structure is simple, light and easy to carry, and the device is also applicable to the measurement of the bent plate of the hot air furnace, the first positioning plate 1 and the second positioning plate 2 can be placed in different positions to measure the center of the bent plate, to avoid different curvatures of the bent plates on the same layer.

[0026] The above description is only a preferred feasible embodiment of the present utility model, and does not limit the scope of rights of the present utility model. All equivalent changes made using the contents of the present utility model specification and its drawings are included in the scope of rights of the present utility model.

Claims

1. A device for locating the center of a circular tube with an irregular end surface, characterized in that: It includes a first positioning plate and a second positioning plate which are V-shaped and have a right angle. The first positioning plate and the second positioning plate are respectively located outside the end of the circular tube and both side edges are against the circular tube. A first positioning rod extending toward the circular tube side is horizontally arranged along the angular dividing line on the top of the first positioning plate. A second positioning rod is hinged on the top of the second positioning plate. The second positioning rod swings up and down in the plane formed by the angular dividing line of the second positioning plate.

2. The center positioning device for a circular tube with an irregular end surface according to claim 1, characterized in that: Magnetic strips are arranged at positions where the first positioning plate and the second positioning plate are adjacent to the round tube.

3. The center positioning device for a circular tube with an irregular end surface according to claim 1, characterized in that: The first positioning rod is provided with scale values.

4. The device for locating the center of a circular tube with irregular end surface according to claim 3, characterized in that: A long hole for reading scales is provided on the second positioning rod along the length direction, and the axis of the second positioning rod is located in one side surface of the long hole along the length direction.

5. The device for locating the center of a circular tube with an irregular end surface according to claim 1, characterized in that: The top surface of the second positioning plate is located above the adjacent end surface of the circular tube.

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