Protractor and angle measuring method

Abstract

The invention belongs to the technical field of ship processing equipment, and discloses a protractor and an angle measuring method, and the protractor comprises a first calibration ruler, a second calibration ruler, a measuring ruler and a measuring plate. The second calibration ruler is rotationally connected to the first calibration ruler; the measuring scale is rotationally connected to the first calibration scale, the measuring scale and the first calibration scale are arranged at an interval, and a pointer is fixedly arranged on the measuring scale; the measuring plate is fixedly connected to the first calibration ruler, angle scale marks are arranged on the measuring plate, and the zero value of the angle scale marks coincides with the edge, facing the measuring ruler, of the first calibration ruler. The first calibration ruler and the second calibration ruler are matched, the first calibration ruler abuts against the edge of one side of the included angle to be measured, meanwhile, the second calibration ruler can abut against other reference objects, and when the measuring ruler rotates relative to the first calibration ruler, the first calibration ruler does not move relative to the object to be measured. When the pointer, the angle scale line and the edge of the other side of the to-be-measured included angle coincide with one another, the scale corresponding to the pointer is the reading of the to-be-measured included angle, and the measurement precision is high.

Description

Technical Field

[0001] The invention relates to the technical field of ship processing equipment, and in particular to a protractor and an angle measuring method. Background Art

[0002] In the process of shipbuilding, it is necessary to measure and calibrate the angles of various supports, pipes and other structures. Whether in production or in processes with complex precision, technicians use old-fashioned folding calipers to perform operations.

[0003] The folding caliper in the prior art includes a protractor and a first measuring ruler and a second measuring ruler that are rotatably connected to each other. When measuring an angle, one measuring ruler needs to be kept in a completely horizontal or completely vertical state, and the other measuring ruler is rotated along the scale of the protractor to the position to be measured. The measurement can be completed by reading the scale value. However, due to the complex structure of the ship, it is not easy to find a reference object that is in a completely horizontal or completely vertical state, resulting in an increase in the error of the angle measurement and insufficient accuracy. Summary of the invention

[0004] The object of the present invention is to provide a protractor and an angle measuring method, which are convenient for cooperating with and abutting against a reference object, so that the protractor has high stability and high measurement accuracy during the measurement process.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Protractor, including:

[0007] a first calibration ruler;

[0008] a second calibration ruler, rotatably connected to the first calibration ruler;

[0009] A measuring ruler, rotatably connected to the first calibration ruler, the measuring ruler and the first calibration ruler are spaced apart, a pointer is fixedly arranged on the measuring ruler, and the projections of the measuring ruler and the second calibration ruler in the horizontal direction are perpendicular to each other;

[0010] A measuring plate is fixedly connected to the first calibration ruler, and a plurality of angle scale lines are arranged at intervals on the measuring plate. The zero degree value of the angle scale line coincides with the edge of the first calibration ruler toward the measuring ruler, and the pointer can overlap any of the angle scale lines.

[0011] Preferably, it further comprises a first locking member, which is sequentially passed through the second calibration ruler and the first calibration ruler and is screwed to the first calibration ruler, and the first locking member can press the second calibration ruler against the first calibration ruler.

[0012] Preferably, it further comprises a second locking member, which is sequentially passed through the measuring ruler and the first calibration ruler and is screwed to the first calibration ruler, and the second locking member can press the measuring ruler against the first calibration ruler.

[0013] Preferably, a first level tube is provided on the first calibration ruler, two first level lines are spaced apart on the surface of the first level tube, and a first level bubble is provided inside; when the first calibration ruler is in a vertical state, the first level bubble is located in the middle of the two first level lines.

[0014] Preferably, a second level tube is provided on the second calibration ruler, two second level lines are spaced apart on the surface of the second level tube, and a second level bubble is provided inside, and when the second calibration ruler is in a horizontal state, the second level bubble is located in the middle of the two second level lines.

[0015] Preferably, a third level tube is provided on the measuring ruler, two third level lines are spaced apart on the surface of the third level tube, and a third level bubble is provided inside. When the measuring ruler is in a horizontal state, the third level bubble is located in the middle of the two third level lines.

[0016] Preferably, both the measuring ruler and the measuring plate are transparent.

[0017] Preferably, the angle scale lines of the measuring plate range from 0° to 180°.

[0018] Preferably, the first calibration ruler and the second calibration ruler are made of stainless steel.

[0019] The angle measurement method comprises the following steps:

[0020] S1, a first calibration ruler is placed against an edge of one side of the angle to be measured;

[0021] S2, the second calibration ruler is placed against the reference object;

[0022] S3. The measuring ruler is rotated relative to the first calibration ruler so that the pointer, the angle scale line and the edge on the other side of the angle to be measured coincide with each other.

[0023] Beneficial effects of the present invention:

[0024] The first calibration ruler and the second calibration ruler cooperate with each other. When the first calibration ruler is against the edge of one side of the angle to be measured, the second calibration ruler can be against other reference objects, so that when the measuring ruler rotates relative to the first calibration ruler, the first calibration ruler will not move relative to the object to be measured, and it is more stable. When the pointer, the angle scale line and the edge on the other side of the angle to be measured coincide with each other, the scale corresponding to the pointer is the reading of the angle to be measured. The structure is simple and the measurement accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a front view of the protractor of the present invention;

[0026] Figure 2 It is a side view of the protractor of the present invention.

[0027] In the figure:

[0028] 1. First calibration ruler; 11. First level tube;

[0029] 2. Second calibration ruler; 21. Second level tube;

[0030] 3. Measuring ruler; 31. Pointer; 32. Third level tube;

[0031] 4. Measuring board;

[0032] 5. a first locking member;

[0033] 6. Second locking piece. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, it can be a mechanical connection or an electrical connection, it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0038] like Figure 1-Figure 2 As shown, the present invention provides a protractor for measuring angles in a shipbuilding process. The protractor comprises a first calibration ruler 1, a second calibration ruler 2, a measuring ruler 3 and a measuring board 4. The second calibration ruler 2 is rotatably connected to the first calibration ruler 1; the measuring ruler 3 is rotatably connected to the first calibration ruler 1, the measuring ruler 3 is spaced apart from the first calibration ruler 1, a pointer 31 is fixedly arranged on the measuring ruler 3, and the projections of the measuring ruler 3 and the second calibration ruler 2 in the horizontal direction are perpendicular to each other; the measuring board 4 is fixedly connected to the first calibration ruler 1, a plurality of angle scale lines are spaced apart on the measuring board 4, the zero value of the angle scale line coincides with the edge of the first calibration ruler 1 facing the measuring ruler 3, and the pointer 31 can overlap any angle scale line.

[0039] The first calibration ruler 1 and the second calibration ruler 2 cooperate with each other. When the first calibration ruler 1 is against the edge of one side of the angle to be measured, the second calibration ruler 2 can be against other reference objects, so that when the measuring ruler 3 rotates relative to the first calibration ruler 1, the first calibration ruler 1 will not move relative to the object to be measured, and it is more stable. When the pointer 31, the angle scale line and the edge on the other side of the angle to be measured coincide with each other, the scale corresponding to the pointer 31 is the reading of the angle to be measured. The structure is simple and the measurement accuracy is high.

[0040] Specifically, the protractor further includes a first locking member 5, which is sequentially provided on the second calibration ruler 2 and the first calibration ruler 1 and is screwed to the first calibration ruler 1, and the first locking member 5 can press the second calibration ruler 2 against the first calibration ruler 1. The arrangement of the first locking member 5 enables the second calibration ruler 2 to be locked to the first calibration ruler 1 to prevent the two from rotating relative to each other during the process of adjusting the measuring ruler 3.

[0041] Specifically, the protractor further includes a second locking member 6, which is sequentially provided on the measuring ruler 3 and the first calibration ruler 1 and is screwed to the first calibration ruler 1, and the second locking member 6 can press the measuring ruler 3 against the first calibration ruler 1. The arrangement of the second locking member 6 enables the measuring ruler 3 to be locked to the first calibration ruler 1, preventing the measuring ruler 3 from rotating relative to the first calibration ruler 1 during reading, thereby affecting the measurement accuracy.

[0042] In this embodiment, both the first locking member 5 and the second locking member 6 are provided with an anti-skid structure, which may be an anti-skid pad, such as a rubber pad, or the like; or the anti-skid structure is an anti-skid protrusion, which may be a dot-shaped protrusion or a patterned protrusion of any shape, as long as the contact friction between the position where the anti-skid protrusion is located and the worker's hand can be increased. The specific form thereof is referred to the prior art and is not specifically limited in this embodiment.

[0043] Specifically, a first level tube 11 is provided on the first calibration ruler 1, two first level lines are arranged on the surface of the first level tube 11 at intervals, and a first level bubble is arranged inside, and when the first calibration ruler 1 is in a vertical state, the first level bubble is located in the middle of the two first level lines. The arrangement of the first level tube 11 facilitates the calibration of the position of the first level tube 11.

[0044] Specifically, a second leveling tube 21 is provided on the second calibration ruler 2, two second leveling lines are arranged on the surface of the second leveling tube 21 at intervals, and a second leveling bubble is arranged inside. When the second calibration ruler 2 is in a horizontal state, the second leveling bubble is located in the middle of the two second leveling lines. The arrangement of the second leveling tube 21 facilitates the calibration of the position of the second leveling tube 21.

[0045] Specifically, the measuring ruler 3 is provided with a third level tube 32, on the surface of which two third level lines are arranged at intervals, and a third level bubble is arranged inside. When the measuring ruler 3 is in a horizontal state, the third level bubble is located in the middle of the two third level lines. With the arrangement of the third level tube 32, when the first level bubble is located in the middle of the two first level lines, and the second level bubble is located in the middle of the two second level lines, and when the pointer 31 points to the 90° scale line on the measuring plate 4, the third level bubble is located exactly in the middle of the two third level lines.

[0046] In this embodiment, the first level tube 11, the second level tube 21 and the third level tube 32 are all filled with fluorescent liquid, and the first level line, the second level line and the third level line are all printed with fluorescent ink to ensure normal use in a dim environment.

[0047] Specifically, both the measuring ruler 3 and the measuring plate 4 are transparent. The above arrangement facilitates observation of whether the pointer 31, the angle scale line and the edge of the angle to be measured coincide with each other.

[0048] In this embodiment, both the angle scale and the pointer 31 are made of fluorescent material to ensure normal use in a dim environment.

[0049] In this embodiment, the measuring plate 4 is semicircular and may be a semicircular protractor commonly used in the art, and its angle scale line range is 0°-180°.

[0050] Specifically, the first calibration ruler 1 and the second calibration ruler 2 are made of stainless steel. The above configuration makes the first calibration ruler 1 and the second calibration ruler 2 less prone to rust and more durable.

[0051] The present invention also provides an angle measurement method, using the above-mentioned protractor, comprising the following steps:

[0052] S1, a first calibration ruler 1 is placed against an edge of one side of the angle to be measured;

[0053] In this step, if the edge of one side of the angle to be measured is in a vertical state, it can be observed whether the first level bubble is exactly in the middle of the two first level lines, thereby determining whether the first calibration ruler 1 is in a vertical state.

[0054] S2, the second calibration ruler 2 is against the reference object;

[0055] In this step, if the reference object is horizontal, it is possible to observe whether the second level bubble is exactly in the middle of the two second level lines to determine whether the second calibration ruler 2 is horizontal, and then turn the first locking member 5 to lock the second calibration ruler 2 to the first calibration ruler 1.

[0056] S3. The measuring ruler 3 is rotated relative to the first calibration ruler 1 so that the pointer 31, the angle scale line and the edge on the other side of the angle to be measured coincide with each other.

[0057] In this step, when the pointer 31, the angle scale line and the edge on the other side of the angle to be measured coincide with each other, the second locking member 6 can be screwed to lock the measuring ruler 3 to the first calibration ruler 1, and then the reading can be taken.

[0058] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A protractor, characterized in that include: A first calibration ruler (1); A second calibration ruler (2) rotatably connected to the first calibration ruler (1); A measuring ruler (3) is rotatably connected to the first calibration ruler (1), the measuring ruler (3) and the first calibration ruler (1) are arranged at a distance, a pointer (31) is fixedly arranged on the measuring ruler (3), and the projections of the measuring ruler (3) and the second calibration ruler (2) in the horizontal direction are perpendicular to each other; A measuring plate (4) is fixedly connected to the first calibration ruler (1), a plurality of angle scale lines are arranged at intervals on the measuring plate (4), the zero-degree values ​​of the angle scale lines coincide with the edge of the first calibration ruler (1) facing the measuring ruler (3), and the pointer (31) can overlap any of the angle scale lines.

2. The protractor according to claim 1, characterized in that: The invention also comprises a first locking member (5), wherein the first locking member (5) is sequentially passed through the second calibration ruler (2) and the first calibration ruler (1), and is screwed to the first calibration ruler (1), and the first locking member (5) is capable of pressing the second calibration ruler (2) against the first calibration ruler (1).

3. The protractor according to claim 1, characterized in that: The invention also comprises a second locking member (6), which is sequentially passed through the measuring ruler (3) and the first calibration ruler (1) and is screwed to the first calibration ruler (1), and the second locking member (6) is capable of pressing the measuring ruler (3) against the first calibration ruler (1).

4. The protractor according to claim 1, characterized in that: The first calibration ruler (1) is provided with a first level tube (11), two first level lines are arranged at intervals on the surface of the first level tube (11), and a first level bubble is arranged inside the first level tube (11); when the first calibration ruler (1) is in a vertical state, the first level bubble is located in the middle of the two first level lines.

5. The protractor according to claim 1, characterized in that: The second calibration ruler (2) is provided with a second level tube (21), two second level lines are arranged at intervals on the surface of the second level tube (21), and a second level bubble is arranged inside the second level tube (21); when the second calibration ruler (2) is in a horizontal state, the second level bubble is located in the middle of the two second level lines.

6. The protractor according to claim 1, characterized in that: The measuring ruler (3) is provided with a third level tube (32), the surface of which is provided with two third level lines at intervals, and a third level bubble is provided inside the third level tube (32); when the measuring ruler (3) is in a horizontal state, the third level bubble is located in the middle of the two third level lines.

7. The protractor according to any one of claims 1 to 6, characterized in that: Both the measuring ruler (3) and the measuring plate (4) are transparent.

8. The protractor according to any one of claims 1 to 6, characterized in that: The angle scale line range of the measuring plate (4) is 0°-180°.

9. The protractor according to any one of claims 1 to 6, characterized in that: The first calibration ruler (1) and the second calibration ruler (2) are made of stainless steel.

10. An angle measurement method, characterized in that, Using the protractor according to any one of claims 1 to 9 comprises the following steps: S1, a first calibration ruler (1) is placed against an edge of one side of the angle to be measured; S2, the second calibration ruler (2) is placed against the reference object; S3, the measuring ruler (3) is rotated relative to the first calibration ruler (1) so that the pointer (31), the angle scale line and the edge on the other side of the angle to be measured coincide with each other.

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