Auxiliary detection device for cross-shaped positioning of circle center in circular tube

Abstract

The utility model discloses a circular tube center cross positioning auxiliary detection device which comprises a disc, an arc-shaped groove is arranged on the lower side of the center of one end of the disc, a deflector rod is arranged in the arc-shaped groove, a center shaft penetrates through the center of the disc, a triangular plate is sleeved on the surface of the center shaft, one end of the deflector rod is fixedly connected with the triangular plate, and the other end of the deflector rod is fixedly connected with the disc. And inner connecting rods are movably arranged at the three vertexes of the triangular plate, and outer connecting rods are movably arranged at the other ends of the inner connecting rods. Compared with the prior art, the tool has the advantages that not only can the roundness and straightness of the welded circular tube be detected in an auxiliary manner, but also the positioning effect can be achieved before welding.

Description

Technical Field

[0001] This utility model relates to the field of circular tube welding technology, specifically to an auxiliary detection device for cross-positioning of the inner center of a circular tube. Background Technology

[0002] Metal round tubes are used in various industries, and welding is an effective method for integrating them. However, for high-precision applications, welding can easily lead to uneven stress on the round tube and straightness issues when welding multiple sections of round tube. Currently, there is no device to locate and detect these problems. To ensure the roundness and straightness after welding, a round tube internal center cross positioning and detection device has been designed. This device has advantages such as accurate centering, high coaxiality, and simple operation. It can be used for positioning before welding and for detecting the straightness of the round tube after welding. It is suitable for round tubes with an inner diameter of 100mm-160mm.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical defects and provide an auxiliary detection device for positioning the inner center cross of a round tube, which can not only assist in detecting the roundness and straightness of the round tube after welding, but also play a positioning role before welding.

[0005] To solve the above problems, the technical solution of this utility model is as follows: a cross-shaped positioning auxiliary detection device for the inner center of a circular tube, including a disc, an arc-shaped groove provided on the lower side of the center of one end of the disc, a lever provided inside the arc-shaped groove, a central shaft passing through the center of the disc, a triangular plate sleeved on the surface of the central shaft, a triangular plate fixedly connected to one end of the lever, a threaded connection at the other end of the lever, an inner connecting rod movably provided at the three vertices of the triangular plate, and an outer connecting rod movably provided at the other end of the inner connecting rod.

[0006] Furthermore, a pressing plate is fitted onto the surface of the lever, the pressing plate is in contact with the disc, and a fastening nut is threadedly connected to the threaded end of the lever.

[0007] Furthermore, the triangular plate has a pivot at each of its three vertices, one end of the inner connecting rod is rotatably sleeved on the pivot, the other end of the inner connecting rod is rotatably sleeved on the pivot, the pivot is fixedly connected to the outer connecting rod, and one end of the disc has a pivot on its surface, one end of the outer connecting rod is rotatably sleeved on the pivot.

[0008] Furthermore, a pointer is provided at one end of the central axis, and a crosshair is provided inside the disk, with the pointer coinciding with one of the crosshair lines.

[0009] Furthermore, the disk, central shaft, triangular plate, inner connecting rod, outer connecting rod, and pointer are all made of transparent material.

[0010] Furthermore, a magnet is provided at the end of the outer connecting rod away from the rotating shaft three.

[0011] The advantages of this invention compared to existing technologies are as follows:

[0012] This utility model involves a lever that slides inside an arc-shaped groove, causing a triangular plate to rotate clockwise. This, in turn, causes three rotating shafts to rotate clockwise, which in turn causes three sets of inner connecting rods to rotate counterclockwise. Consequently, three sets of outer connecting rods rotate clockwise around the rotating shafts. The three sets of outer connecting rods open outwards until their other ends contact the inner wall of the pipe. Magnets then magnetically attract the pipe. Tightening the locking nut secures the lever. Two sets of round tube inner center cross positioning auxiliary detection devices are fixed at both ends inside the welded pipe. These devices not only assist in detecting the roundness and straightness of the welded pipe but also serve a positioning function before welding. Attached Figure Description

[0013] Figure 1 This utility model is a three-dimensional auxiliary detection device for cross-positioning inside a circular tube. Figure 1 .

[0014] Figure 2 This utility model is a three-dimensional auxiliary detection device for cross-positioning inside a circular tube. Figure 2 .

[0015] Figure 3 This is an enlarged view of point A of the auxiliary detection device for cross positioning inside a circular tube according to this utility model.

[0016] As shown in the figure: 1. Disc; 2. Arc groove; 3. Lever; 4. Central shaft; 5. Triangle plate; 6. Inner connecting rod; 7. Outer connecting rod; 8. Rotating shaft one; 9. Rotating shaft two; 10. Rotating shaft three; 11. Extrusion plate; 12. Fastening nut; 13. Pointer; 14. Crosshair marking line. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.

[0018] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0019] To make the content of this utility model easier to understand, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0020] Example 1

[0021] like Figures 1 to 3 As shown, the auxiliary detection device for center cross positioning inside a circular tube includes a disc 1. An arc-shaped groove 2 is opened on the lower side of the center of one end of the disc 1. A lever 3 is installed inside the arc-shaped groove 2 and can slide inside the arc-shaped groove 2. A central shaft 4 is installed through the center of the disc 1. A triangular plate 5 is fitted on the surface of the central shaft 4. The triangular plate 5 is connected to the central shaft 4 through a bearing and can rotate on the surface of the central shaft 4. One end of the lever 3 is fixedly connected to the triangular plate 5, and the lever 3 can drive the triangular plate 5 to rotate.

[0022] The other end of the lever 3 has a threaded surface, and a pressing plate 11 is fitted on the surface of the lever 3. The pressing plate 11 contacts the disc 1. The threaded end of the lever 3 is threadedly connected to a fastening nut 12. By rotating the fastening nut 12, the friction between the pressing plate 11 and the disc 1 can be adjusted. When it is necessary to fix the lever 3 and the triangular plate 5, tightening the fastening nut 12 increases the friction between the pressing plate 11 and the disc 1, which can fix the lever 3 and thus fix the triangular plate 5.

[0023] An inner connecting rod 6 is movably installed at the three vertices of the triangle 5. An outer connecting rod 7 is movably installed at the other end of the inner connecting rod 6. A rotating shaft 8 is installed at the three vertices of the triangle 5. One end of the inner connecting rod 6 is rotatably sleeved onto the rotating shaft 8. The other end of the inner connecting rod 6 is rotatably sleeved onto the rotating shaft 9. The rotating shaft 9 is fixedly connected to the outer connecting rod 7. A rotating shaft 10 is installed on one end of the surface of the disc 1. One end of the outer connecting rod 7 is rotatably sleeved onto the rotating shaft 10.

[0024] When lever 3 slides inside arc groove 2, it drives triangle plate 5 to rotate clockwise, which in turn drives three rotating shafts 8 to rotate clockwise, thereby driving three sets of inner connecting rods 6 to rotate counterclockwise, and then driving three sets of outer connecting rods 7 to rotate clockwise around rotating shaft 10. The three sets of outer connecting rods 7 open outwards from disk 1 until the other end of the three sets of outer connecting rods 7 contacts the inner wall of the pipe. A magnet is installed on the end of the outer connecting rod 7 away from rotating shaft 10. The magnet is attracted to the inside of the pipe. Then, tighten the fastening nut 12 to fix lever 3.

[0025] It should be noted that during the above-mentioned movement, the two ends of the inner connecting rod 6 rotate at pivot 8 and pivot 9 respectively.

[0026] A pointer 13 is installed at one end of the central axis 4, keeping the pointer 13 vertically downward. A crosshair 14 is installed inside the disk 1, with the pointer 13 coinciding with one of the lines of the crosshair 14. The disk 1, central axis 4, triangle 5, inner connecting rod 6, outer connecting rod 7, and pointer 13 are all made of transparent material, making it easy to observe the crosshair 14. The crosshair 14 can be marked with a bright color.

[0027] In practical use, the welded round pipe to be inspected is placed horizontally and fixed. Two sets of auxiliary inspection devices with central cross positioning are placed inside the welded round pipe at both ends, ensuring that pointer 13 points vertically downwards. The lever 3 is moved to slide inside the arc-shaped groove 2, causing the triangular plate 5 to rotate clockwise, simultaneously causing the three rotating shafts 8 to rotate clockwise, which in turn causes the three sets of inner connecting rods 6 to rotate counterclockwise, and then causes the three sets of outer connecting rods 7 to rotate clockwise around the rotating shaft 10. The three sets of outer connecting rods 7 open outwards from the disc 1 until the other end of the three sets of outer connecting rods 7 contacts the inner wall of the pipe, where the magnet is attracted to the pipe. Inside, tighten the fixing nut 12 to fix the lever 3. The two sets of round tube inner center cross positioning auxiliary detection devices are fixed at both ends of the welded pipe. Then, external equipment is used to calibrate the two sets of cross marking lines 14. The specific principle is to use an observation instrument with a telescope function. The instrument has a crosshair inside. The crosshair of the instrument and the focal point of the cross marking line 14 are at the same horizontal height. Observe whether the center of the crosshair is on the same straight line as the midpoint of the two sets of cross marking lines 14. If they are on the same straight line, the roundness and straightness of the welded pipe are qualified; otherwise, they are unqualified.

[0028] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An auxiliary detection device for center-cross positioning inside a circular tube, characterized in that... ,include: A disc (1) has an arc-shaped groove (2) on the lower side of the center of one end of the disc (1). A lever (3) is provided inside the arc-shaped groove (2). A central shaft (4) is provided through the center of the disc (1). A triangular plate (5) is fitted on the surface of the central shaft (4). One end of the lever (3) is fixedly connected to the triangular plate (5). The other end of the lever (3) is threaded. An inner connecting rod (6) is movably provided at the three vertices of the triangular plate (5). An outer connecting rod (7) is movably provided at the other end of the inner connecting rod (6).

2. The auxiliary detection device for center cross positioning inside a circular tube according to claim 1, characterized in that: A pressing plate (11) is fitted on the surface of the lever (3), the pressing plate (11) is in contact with the disc (1), and the threaded end of the lever (3) is threadedly connected to a fastening nut (12).

3. The auxiliary detection device for center cross positioning inside a circular tube according to claim 1, characterized in that: The triangular plate (5) has a rotating shaft 1 (8) at its three vertices. One end of the inner connecting rod (6) is rotatably sleeved on the rotating shaft 1 (8). The other end of the inner connecting rod (6) is rotatably sleeved on the rotating shaft 2 (9). The rotating shaft 2 (9) is fixedly connected to the outer connecting rod (7). One end of the disc (1) has a rotating shaft 3 (10). One end of the outer connecting rod (7) is rotatably sleeved on the rotating shaft 3 (10).

4. The auxiliary detection device for center cross positioning inside a circular tube according to claim 1, characterized in that: The central axis (4) has a pointer (13) at one end, and the disk (1) has a crosshair (14) inside. The pointer (13) coincides with one of the crosshairs (14).

5. The auxiliary detection device for center cross positioning inside a circular tube according to claim 4, characterized in that: The disk (1), central shaft (4), triangular plate (5), inner connecting rod (6), outer connecting rod (7), and pointer (13) are all made of transparent material.

6. The auxiliary detection device for center cross positioning inside a circular tube according to claim 3, characterized in that: The outer connecting rod (7) has a magnet at the end away from the rotating shaft (10).

Images