A special longitudinal inclination measuring ruler for pipe joints

Abstract

The application relates to the technical field of measuring devices, and provides a special longitudinal inclination measuring scale for pipe joints, which comprises a measuring rod, a balance rod, a connecting rod, a reading arm, a first end of the connecting rod is rotationally connected with the measuring rod, a second end of the connecting rod is rotationally connected with the balance rod, a first end of the reading arm is rotationally connected with the balance rod, a middle part of the reading arm is rotationally connected with the measuring rod through a positioning pin shaft, a first scale line is arranged on a second end of the reading arm, the extending direction of the first scale line is kept parallel to the reading arm, a parallelogram structure is formed among the measuring rod, the balance rod, the connecting rod and the reading arm, a measuring arm is kept perpendicular to the measuring rod, a first end of the measuring arm is fixedly connected with the measuring rod, a second end of the measuring arm is a free end, a second scale line is arranged on the measuring arm, the extending direction of the second scale line is kept perpendicular to the measuring rod, and the starting point of the second scale line is the center point of the positioning pin shaft.

Description

Technical Field

[0001] The invention relates to the technical field of measuring equipment, in particular to a special longitudinal inclination measuring ruler for pipe joints. Background Art

[0002] During the welding and assembly of pipe joints for power plant boiler headers, it's often necessary to measure the longitudinal inclination of the joints to determine if they've been properly assembled. The traditional measurement method currently uses a protractor and steel ruler. This combination requires high skill and two-handed coordination, and can result in unstable readings and large errors. This is particularly true when measuring the longitudinal inclination of rows of pipe joints. Due to the close spacing between the joints, the protractor's size limits prevent it from fully conforming to the pipe surface, leading to significant errors. Sometimes, readings rely entirely on the operator's experience. Overall, traditional measurement methods are inconvenient and subject to significant measurement errors. Summary of the Invention

[0003] In view of the defects in the prior art, the purpose of the present invention is to provide a special longitudinal inclination measuring ruler for pipe joints, which is easy to operate and has a small measurement error.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solution: a special longitudinal inclination measuring ruler for pipe joints, comprising:

[0005] A measuring rod, a balancing rod, a connecting rod and a reading arm, wherein the first end of the connecting rod is rotatably connected to the measuring rod via a first connecting pin, the second end of the connecting rod is rotatably connected to the balancing rod via a second connecting pin, the first end of the reading arm is rotatably connected to the balancing rod via a third connecting pin, the middle portion of the reading arm is rotatably connected to the measuring rod via a positioning pin, a first scale line is provided on the second end of the reading arm, an extension direction of the first scale line is parallel to the reading arm and passes through the center point of the positioning pin, a starting point of the first scale line is the center point of the positioning pin, and a parallelogram structure is formed between the measuring rod, the balancing rod, the connecting rod and the reading arm; and

[0006] The measuring arm is perpendicular to the measuring rod, the first end of the measuring arm is fixedly connected to the measuring rod, the second end of the measuring arm is a free end, and a second scale line is provided on the measuring arm. The extension direction of the second scale line is perpendicular to the measuring rod and passes through the center point of the positioning pin shaft. The starting point of the second scale line is the center point of the positioning pin shaft.

[0007] Furthermore, the measuring arm has grid lines, and the grid lines are used to display the vertical distance between the first scale line and the second scale line.

[0008] Furthermore, the lowest point of the measuring rod is flush with the lowest point of the balancing rod, and the highest point of the measuring rod is flush with the highest point of the balancing rod.

[0009] Furthermore, the bottom of the measuring rod has a first spike portion, which is located on the extension line of the center connection between the first connecting pin and the positioning pin, and the bottom of the balance rod has a second spike portion, which is located on the extension line of the center connection between the second connecting pin and the third connecting pin.

[0010] Furthermore, the second end of the measuring arm extends in a direction away from the balance pole.

[0011] The beneficial effects of the present invention are as follows: The present invention provides a dedicated longitudinal inclination measuring ruler for pipe joints. When used, the bottoms of the measuring rod and the balancing rod are first placed in contact with the pipe. The inner side of the measuring rod is then placed against the surface of the pipe joint. The angle between the measuring arm and the reading arm is then equal to the longitudinal inclination angle of the pipe joint. Finally, a congruent triangle is found using the first scale line, the second scale line, the grid lines, and the height of the pipe joint to directly read the longitudinal inclination length of the pipe joint. The entire process is easy to operate and can intuitively reflect the longitudinal inclination angle of the pipe joint, resulting in a relatively small measurement error. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view structural schematic diagram of the present invention;

[0013] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0014] Figure markings: 10-measuring rod, 11-first spike, 20-balancing rod, 21-second spike, 30-connecting rod, 40-reading arm, 41-first scale line, 50-measuring arm, 51-second scale line, 52-grid line, 61-first connecting pin, 62-second connecting pin, 63-third connecting pin, 64-positioning pin, 70-pipeline, 71-pipe joint. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0016] In this application, unless otherwise specified or limited, the terms "connect" and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0017] In the description of this application, it should be understood that the terms "longitudinal", "transverse", "horizontal", "top", "bottom", "up", "down", "inside" and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0018] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0019] like Figure 1-2 As shown, the present invention provides a special longitudinal inclination measuring ruler for pipe joints, which includes a measuring rod 10, a balancing rod 20, a connecting rod 30, a reading arm 40 and a measuring arm 50.

[0020] The first end of the connecting rod 30 is rotatably connected to the measuring rod 10 via a first connecting pin 61, and the second end of the connecting rod 30 is rotatably connected to the balancing rod 20 via a second connecting pin 62. The first end of the reading arm 40 is rotatably connected to the balancing rod 20 via a third connecting pin 63, and the middle portion of the reading arm 40 is rotatably connected to the measuring rod 10 via a positioning pin 64.

[0021] The second end of the reading arm 40 has a first scale line 41. The first scale line 41 extends parallel to the reading arm 40 and passes through the center of the locating pin 64. The starting point of the first scale line 41 is the center of the locating pin 64. A parallelogram structure is formed between the measuring rod 10, the balancing rod 20, the connecting rod 30, and the reading arm 40.

[0022] Measuring arm 50 is perpendicular to measuring rod 10. Its first end is fixedly connected to measuring rod 10, while its second end is free. Measuring arm 50 has second scale lines 51 on it. These lines extend perpendicular to measuring rod 10 and pass through the center of locating pin 64. The starting point of second scale lines 51 is the center of locating pin 64.

[0023] Initially, the measuring rod 10 and balancing rod 20 are both vertical. The connecting rod 30, reading arm 40, and measuring arm 50 are all horizontal. At this point, the first scale line 41 overlaps with the second scale line 51, forming a rectangular structure between the measuring rod 10, balancing rod 20, connecting rod 30, and reading arm 40.

[0024] Before using the present invention, first place the bottoms of the measuring rod 10 and balancing rod 20 in contact with the pipe 70, then place the inner side of the measuring rod 10 against the surface of the pipe joint 71. Due to the parallelogram's properties, the reading arm 40 is naturally parallel to the pipe 70 and horizontal, further facilitating use and operation.

[0025] The specific usage process is as follows: First, place the inner side of the measuring rod 10 against the surface of the pipe joint 71 while keeping the reading arm 40 horizontal. At this point, the longitudinal tilt angle of the pipe joint 71 is equal to the longitudinal tilt angle a of the measuring rod 10. The angle between the measuring arm 50 and the reading arm 40 is b, and the angle between the measuring rod 10 and the reading arm 40 is c. Since the measuring arm 50 is perpendicular to the measuring rod 10, c + b = 90°. Since the reading arm 40 is horizontal, c + a = 90°. According to the mathematical formula, b = a, meaning that the angle between the measuring arm 50 and the reading arm 40 is equal to the longitudinal tilt angle of the pipe joint 71. Finally, the angle between the measuring arm 50 and the reading arm 40 is read from the first scale mark 41 and the second scale mark 51 to determine the longitudinal tilt angle of the pipe joint 71. The entire process is easy to operate and can intuitively reflect the longitudinal tilt angle of the pipe joint 71, thereby minimizing measurement errors.

[0026] In one embodiment, the measuring arm 50 has a grid line 52 , which is composed of a plurality of square grids with a side length of 1 mm, and is used to display the vertical distance between the first scale line 41 and the second scale line 51 .

[0027] Based on the height h of the pipe joint 71, the operator can find a congruent triangle on the measuring arm 50 and directly read the longitudinal tilt length d of the pipe joint 71 using the grid lines 52. The included angle b between the measuring arm 50 and the reading arm 40 can then be calculated using trigonometric formulas, thereby obtaining the longitudinal tilt angle a of the pipe joint 71.

[0028] In one embodiment, the lowest point of the measuring pole 10 is flush with the lowest point of the balancing pole 20 , and the highest point of the measuring pole 10 is flush with the highest point of the balancing pole 20 .

[0029] In one embodiment, the bottom of the measuring rod 10 has a first spike 11, located on the extension line of the center of the first connecting pin 61 and the positioning pin 64. The bottom of the balancing rod 20 has a second spike 21, located on the extension line of the center of the second connecting pin 62 and the third connecting pin 63. This allows operators to easily swing the measuring rod 10 and the balancing rod 20, thereby ensuring that the inner side of the measuring rod 10 is in close contact with the pipe joint 71.

[0030] In one embodiment, the second end of the measuring arm 50 extends away from the balancing pole 20 . This makes it easier for workers to read data and prevents the measuring arm 50 from contacting the pipe joint 71 , making it easier to use.

[0031] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as illustrative and non-restrictive in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and all changes that come within the meaning and range of equivalents of the claims are intended to be included therein.

[0032] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A special longitudinal inclination measuring ruler for pipe joints, characterized by: include: A measuring rod, a balancing rod, a connecting rod and a reading arm, wherein the first end of the connecting rod is rotatably connected to the measuring rod via a first connecting pin, the second end of the connecting rod is rotatably connected to the balancing rod via a second connecting pin, the first end of the reading arm is rotatably connected to the balancing rod via a third connecting pin, the middle portion of the reading arm is rotatably connected to the measuring rod via a positioning pin, a first scale line is provided on the second end of the reading arm, an extension direction of the first scale line is parallel to the reading arm and passes through the center point of the positioning pin, the starting point of the first scale line is the center point of the positioning pin, and a parallelogram structure is formed between the measuring rod, the balancing rod, the connecting rod and the reading arm; as well as a measuring arm, wherein the measuring arm is perpendicular to the measuring rod, the first end of the measuring arm is fixedly connected to the measuring rod, the second end of the measuring arm is a free end, and the measuring arm has a second scale line, the extension direction of the second scale line is perpendicular to the measuring rod and passes through the center point of the positioning pin shaft, and the starting point of the second scale line is the center point of the positioning pin shaft; The measuring arm is provided with grid lines, and the grid lines are used to display the vertical distance between the first scale line and the second scale line; The bottom of the measuring rod has a first spike portion, which is located on the extension line of the center connection between the first connecting pin and the positioning pin. The bottom of the balance rod has a second spike portion, which is located on the extension line of the center connection between the second connecting pin and the third connecting pin.

2. A special longitudinal inclination measuring ruler for pipe joints according to claim 1, characterized in that: The lowest point of the measuring rod is flush with the lowest point of the balancing rod, and the highest point of the measuring rod is flush with the highest point of the balancing rod.

3. A special longitudinal inclination measuring ruler for pipe joints according to claim 1, characterized in that: The second end of the measuring arm extends in a direction away from the balance pole.

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