A Measuring Device and Method for the Bending Angle and Center Height of a High-Pressure Elbow Blank

Abstract

The present invention relates to the technical field of quality inspection of elbow blanks, specifically a device and method for measuring the bending angle and center height of high-pressure elbow blanks, including a transparent substrate. A horizontally arranged slide rail is slidably connected to the transparent substrate, and a protractor is slidably connected to the slide rail. The protractor is provided with angle scales and length scales; it also includes an angle indicating handle for indicating the bending angle, and the angle indicating handle is hingedly connected to the axis of the protractor; a first distance measuring tool is arranged on the angle indicating handle; an auxiliary scale is arranged at the lower right position of the transparent substrate, and a second distance measuring tool is fixed at the middle position of the auxiliary scale; the present invention has significant advantages such as high-precision measurement, multi-functional integration, convenient operation, strong stability, and wide application range; through an integrated design and symmetric scale setting, the accurate determination of the geometric parameters of the elbow is realized, and the measurement error is reduced; tools such as the slide rail and the protractor work together to improve the measurement efficiency and operation flexibility.

Description

Technical Field

[0001] The present invention relates to the technical field of quality inspection of elbow blanks, and specifically to a device and method for measuring the bending angle and center height of high-pressure elbow blanks. Background Art

[0002] A high-pressure elbow blank refers to the initial material or semi-finished product used to manufacture a high-pressure elbow, usually a metal material, which needs to undergo subsequent processing to become a finished product; the forming quality of the high-pressure elbow blank directly affects the subsequent processing and the quality of the finished product. High-quality blanks can improve processing efficiency, reduce the scrap rate, and ensure the performance and service life of the finished product; therefore, after the production of high-pressure elbow blanks in the same batch, spot checks are usually required; the spot check of high-pressure elbow blanks is to ensure that their quality meets the standards, and usually, tools such as calipers and micrometers are used to check the following key items: outer diameter, inner diameter, wall thickness, center line length, center height, etc.

[0003] Among them, the bending angle and center height dimensions are important evaluation factors for evaluating the forming quality of high-pressure elbow blanks; in the existing quality spot checks, the measurement of the bending angle and center height is usually a major difficulty for quality inspectors, and the reasons are as follows: 1. The actual positions of the bending angle and center height are inside the blank or outside the bend angle, which are not easy to measure; 2. Since high-pressure elbows are usually arc-shaped, the curved surface shape increases the complexity of measurement; 3. Since the surface of the high-pressure elbow blank is rough, there are burrs and unevenness, which affect the contact of the measuring tool, and it is easy to tilt or warp when the measuring scale is placed, so it is not convenient to measure; 4. The high-pressure elbow blank has machining allowances and unstable dimensions, which further increase the measurement difficulty.

[0004] Therefore, how to quickly and accurately measure the bending angle and center height of high-pressure elbow blanks has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a device and method for measuring the bending angle and center height of high-pressure elbow blanks, which are convenient for measuring the bending angle and center height of elbow blanks.

[0006] The technical solution adopted by the present invention to solve its technical problems is:

[0007] A measuring device for the bending angle and center height of a high-pressure elbow blank, comprising a transparent substrate placed on the half-opened elbow blank. A horizontally arranged slide rail is slidably connected to the transparent substrate. The slide rail can slide up and down along the transparent substrate and is locked and fixed by a first locking member. A protractor is slidably connected to the slide rail, and a second locking member capable of locking the protractor on the slide rail is provided on the protractor. The semi-circular edge of the protractor is marked with angle scales, and the straight edge of the protractor is parallel to the slide rail and marked with length scales. It also includes an angle indicating handle, which is hingedly connected to the protractor axis and locked and fixed by a third locking member. The part of the angle indicating handle above the hinged point of the protractor axis extends towards the angle scale of the protractor to indicate the bending angle. A first distance measuring tool is provided on the angle indicating handle. An auxiliary scale is provided at the lower right position of the transparent substrate, and a second distance measuring tool is fixed at the middle position of the auxiliary scale. The length scales on the protractor and the auxiliary scale on the transparent substrate are symmetrically arranged about the central axis. When the first distance measuring tool is located on the center line of the A end of the half-opened elbow blank and the second distance measuring tool is located on the center line of the B end of the half-opened elbow blank, the intersection point of the first distance measuring tool and the second distance measuring tool is the bending center of the half-opened elbow blank. The reading of the first distance measuring tool is the center height of the A end of the half-opened elbow blank, the reading of the second distance measuring tool is the center height of the B end of the half-opened elbow blank, and the reading of the angle indicating handle on the angle scale is the bending angle.

[0008] Preferably, a further technical solution of the present invention is:

[0009] Preferably, two transparent connecting plates are symmetrically arranged about the axis on the protractor. A through-adjusting straight ruler is connected to the ends of the two transparent connecting plates away from the protractor. The scales on the two transparent connecting plates and the adjusting straight ruler are symmetrically arranged about the central axis of the adjusting straight ruler. The adjusting straight ruler is parallel to the straight edge of the protractor. The transparent connecting plates are hingedly connected to the protractor, the transparent connecting plates are hingedly connected to the adjusting straight ruler, and the hinged point of the angle indicating handle and the adjusting straight ruler is located on the central axis of the adjusting straight ruler.

[0010] Preferably, a plurality of magnets for fixing the half-opened elbow blank are provided on the transparent substrate.

[0011] Preferably, the magnet is an electromagnet or a switch magnet; the magnet (such as an electromagnet or a switch magnet) provided on the transparent substrate can firmly fix the half-opened elbow blank, prevent displacement during the measurement process, and ensure the measurement stability.

[0012] Preferably, it further includes a support table for placing the half-opened elbow blank, and the cross-section of the tabletop side of the support table is a toothed structure.

[0013] Preferably, at least one of the first distance measuring tool and the second distance measuring tool is a distance measuring ruler, and the other is a distance measuring ruler or a laser distance meter.

[0014] Preferably, L-shaped connecting hooks are arranged at both ends of the slide rail. The vertical part of the connecting hook is connected to the slide rail, and the horizontal part is arranged parallel to the slide rail. The slide rail is slidably connected to the transparent substrate through the connecting hook; a chute with a T-shaped longitudinal section is opened on the slide rail, and the protractor is slidably connected to the chute; the first locking member includes two locking seats, which are respectively located at the left and right ends of the chute. A first locking bolt is threadedly connected to the locking seat, and a through hole is provided on the slide rail corresponding to the end of the first locking bolt. When the end of the first locking bolt passes through the through hole and abuts against the transparent substrate, the position of the slide rail is locked.

[0015] Preferably, the second locking member includes a second locking bolt and a slider. The slider is slidably connected to the slide rail, and the second locking bolt passes through the protractor and is threadedly connected to the slider.

[0016] Preferably, a hinge shaft is arranged at the axial center position of the protractor, and the angle indicating handle is hinged to the protractor through the hinge shaft; the third locking member includes a locking sleeve threadedly connected to the hinge shaft. When the end of the locking sleeve abuts against the angle indicating handle, the angle indicating handle is locked.

[0017] The present invention also discloses a method for measuring the center height of a high-pressure elbow blank, which uses a high-pressure elbow blank bending angle and center height measuring device for measurement, and includes the following steps:

[0018] S1: Select an elbow blank to be detected;

[0019] S2: Cut the elbow blank in half. When cutting in half, it should be cut along the center line to obtain a half-cut elbow blank:

[0020] S3: Place the transparent substrate on the section of the half-cut elbow blank, move the transparent substrate and observe the position of the auxiliary scale relative to the inner wall of the half-cut elbow blank. When the scale readings on the auxiliary scale of the inner wall at the B end of the half-cut elbow blank are the same, the second distance measuring tool is located on the center line of the B end of the half-cut elbow blank;

[0021] S4: Magnetically fix the transparent substrate and the half-cut elbow blank with a magnet;

[0022] S5: Adjust the height of the slide rail so that the measurement starting point of the first distance measuring tool is located at the edge of the A end of the half-cut elbow blank;

[0023] S6: Slide the protractor. By observing the position of the length scale of the protractor relative to the inner wall of the A end of the half-cut elbow blank, make the center of the protractor located on the center line of the A end of the half-cut elbow blank;

[0024] S7: Rotate the angle indicating handle so that the first distance measuring tool is located on the center line of end A of the semi-sectioned elbow blank.

[0025] S8: The intersection point of the first distance measuring tool and the second distance measuring tool is the bending center of the semi-sectioned elbow blank. The reading of the first distance measuring tool is the center height of end A of the semi-sectioned elbow blank, the reading of the second distance measuring tool is the center height of end B of the semi-sectioned elbow blank, and the reading of the angle indicating handle on the angle scale is the bending angle of the semi-sectioned elbow blank.

[0026] The present invention adopting the above technical solution, compared with the prior art, its prominent features are:

[0027] The measuring device and its measuring method have significant advantages such as high-precision measurement, multi-functional integration, convenient operation, strong stability, wide application range, etc.; through the integrated design and symmetrical scale setting, the accurate determination of the geometric parameters of the elbow is realized, reducing the measurement error; the coordinated action of the slide rail, protractor and distance measuring tool improves the measurement efficiency and operation flexibility; the magnetic adsorption fixation and locking mechanism ensure the stability of the measurement process; the transparent substrate and visualization design further enhance the convenience of operation. In addition, the device has strong versatility and high scalability, can significantly improve production efficiency, reduce costs and manual errors, and has high engineering application value and technological innovation. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of a measuring device in use according to an embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of a measuring device according to an embodiment of the present invention;

[0030] Figure 3 is a schematic structural diagram of another measuring device in use according to an embodiment of the present invention;

[0031] Figure 4 is a schematic structural diagram of another measuring device according to an embodiment of the present invention;

[0032] Figure 5 is a schematic cross-sectional structural diagram of the connection part of the first locking member according to an embodiment of the present invention;

[0033] Figure 6 is a schematic cross-sectional structural diagram of the connection part of the third locking member according to an embodiment of the present invention;

[0034] Figure 7 is a schematic cross-sectional structural diagram of the connection part of the second locking member according to an embodiment of the present invention;

[0035] Figure 8 is a schematic side view structural diagram of a measuring device in use according to an embodiment of the present invention.

[0036] Description of reference numerals: 1, transparent substrate; 2, slide rail; 201, chute; 202, through hole; 3, first locking member; 301, locking seat; 302, first locking bolt; 4, protractor; 5, second locking member; 6, angle indicating handle; 601, indicating mark; 7, third locking member; 701, hinge shaft; 702, locking sleeve; 703, arched gasket; 8, first distance measuring tool; 9, auxiliary scale; 10, second distance measuring tool; 11, transparent connecting plate; 12, adjusting straightedge; 13, magnet; 14, semi - cut elbow blank; 15, connecting hook; 16, slider; 17, support platform. Detailed implementation manners

[0037] The present invention will be further described below in conjunction with specific embodiments. The purpose is only to better understand the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0038] As Figures 1 to 8 shown, this embodiment provides a device for measuring the bending angle and center height of a high - pressure elbow blank, including a transparent substrate 1 placed on the semi - cut elbow blank 14. The transparent substrate 1 can be formed by connecting several unit substrates through hinges; a horizontally arranged slide rail 2 is slidably connected to the transparent substrate 1. The slide rail 2 can slide up and down along the transparent substrate 1 and is locked and fixed by a first locking member 3; a protractor 4 is slidably connected to the slide rail 2. A second locking member 5 is provided on the protractor 4 to lock the protractor 4 on the slide rail 2. The semi - circular edge of the protractor 4 is marked with angle scales, and the straight edge of the protractor 4 is parallel to the slide rail 2 and marked with length scales; an angle indicating handle 6 is also included. The angle indicating handle 6 is hinged to the center of the protractor 4 and locked and fixed by a third locking member 7; the part of the angle indicating handle 6 above the hinge point at the center of the protractor 4 extends towards the angle scales of the protractor 4, and an indicating mark 601 is provided near the angle scales to indicate the bending angle; a first distance measuring tool 8 is provided on the angle indicating handle 6; an auxiliary scale 9 is fixed at the lower right - hand side position of the transparent substrate 1, and a second distance measuring tool 10 is fixed at the middle position of the auxiliary scale 9; the length scales on the protractor 4 and the auxiliary scale 9 on the transparent substrate 1 are symmetrically arranged about the central axis; when the first distance measuring tool 8 is located on the center line of the A end of the semi - cut elbow blank 14, and the second distance measuring tool 10 is located on the center line of the B end of the semi - cut elbow blank 14, the intersection point of the first distance measuring tool 8 and the second distance measuring tool 10 is the bending center of the semi - cut elbow blank 14. The reading of the first distance measuring tool 8 is the center height of the A end of the semi - cut elbow blank 14, the reading of the second distance measuring tool 10 is the center height of the B end of the semi - cut elbow blank 14, and the reading of the angle indicating handle 6 on the angle scales is the bending angle of the semi - cut elbow blank 14.

[0039] When the bending angle and center height measuring device for the high-pressure elbow blank is in use, the specific usage method is as follows. That is, the present invention also discloses a method for measuring the center height of the high-pressure elbow blank:

[0040] S1: Select the elbow blank to be detected.

[0041] S2: Cut the elbow blank in half. When cutting in half, it should be cut along the center line to obtain the elbow blank 14 cut in half.

[0042] S3: Place the transparent substrate 1 on the cut surface of the elbow blank 14 cut in half. Move the transparent substrate 1 while observing the position of the auxiliary scale 9 relative to the inner wall of the elbow blank 14 cut in half. When the scale readings on the auxiliary scale 9 on both inner walls at the B end of the elbow blank 14 cut in half are the same, the second distance measuring tool 10 is located on the center line of the B end of the elbow blank 14 cut in half.

[0043] S4: Use the magnet 13 to magnetically fix the transparent substrate 1 and the elbow blank 14 cut in half.

[0044] S5: Adjust the height of the slide rail 2 so that the measurement starting point of the first distance measuring tool 8 is located at the edge of the A end of the elbow blank 14 cut in half; when the ends (A end and B end) of the elbow blank 14 cut in half are uneven, since the subsequent processing requires the end face to be leveled with the lowest point of the edge as the edge boundary, the measurement starting points of the first distance measuring tool 8 and the second distance measuring tool 10 should be flush with the lowest point of the edge of the ends of the elbow blank 14 cut in half.

[0045] S6: Slide the protractor 4. By observing the position of the length scale of the protractor 4 relative to the inner wall of the A end of the elbow blank 14 cut in half, make the axis of the protractor 4 located on the center line of the A end of the elbow blank 14 cut in half.

[0046] S7: Rotate the angle indicating handle 6 so that the first distance measuring tool 8 is located on the center line of the A end of the elbow blank 14 cut in half.

[0047] S8: The intersection point of the first distance measuring tool 8 and the second distance measuring tool 10 is the bending center of the elbow blank 14 cut in half. The reading of the first distance measuring tool 8 is the center height of the A end of the elbow blank 14 cut in half. The reading of the second distance measuring tool 10 is the center height of the B end of the elbow blank 14 cut in half. The reading of the angle indicating handle 6 on the angle scale is the bending angle of the elbow blank 14 cut in half.

[0048] Since the elbow blank is obtained by cutting along the center line, the center height of the A end of the semi-sectioned elbow blank 14, the center height of the B end of the semi-sectioned elbow blank 14, and the bending angle of the semi-sectioned elbow blank 14 are the center height of the A end of the elbow blank, the center height of the B end of the elbow blank, and the bending angle of the elbow blank 14.

[0049] Furthermore, two transparent connecting plates 11 are symmetrically arranged on the protractor 4 with respect to the axis. One end of the two transparent connecting plates 11 away from the protractor 4 is connected with a through adjusting straight ruler 12. The scales on the two transparent connecting plates 11 and the adjusting straight ruler 12 are symmetrically arranged with respect to the central axis of the adjusting straight ruler 12. The adjusting straight ruler 12 is arranged parallel to the straight edge of the protractor 4. The transparent connecting plate 11 and the protractor 4, the transparent connecting plate 11 and the adjusting straight ruler 12, and the angle indicating handle 6 and the adjusting straight ruler 12 are all hinged connections; that is to say, when the adjusting straight ruler 12 is translated, the straight edge of the adjusting straight ruler 12, the two transparent connecting plates 11 and the protractor 4 always form a parallelogram structure; the hinge point of the angle indicating handle 6 and the adjusting straight ruler 12 is located on the central axis of the adjusting straight ruler 12; after the angle indicating handle 6 is locked, the parallelogram formed by the straight edge of the adjusting straight ruler 12, the two transparent connecting plates 11 and the protractor 4 is also locked and fixed.

[0050] During use, in step S7, when adjusting the angle indicating handle 6 so that the first distance measuring tool 8 is located on the center line of the A end of the semi-sectioned elbow blank 14, the adjusting straight ruler 12 can be used for auxiliary adjustment. Since the scales on the adjusting straight ruler 12 are symmetrically arranged with respect to the central axis, the adjusting straight ruler 12 is horizontally moved so that the readings of the inner side walls on both sides of the semi-sectioned elbow blank 14 on the adjusting straight ruler 12 are the same, which is convenient for quickly adjusting the position of the first distance measuring tool 8 and improves the accuracy of the position adjustment of the first distance measuring tool 8, thereby improving the accuracy of the measurement result.

[0051] As Figures 1 to 4 shown, a plurality of magnets 13 for fixing the semi-sectioned elbow blank 14 are arranged on the transparent substrate 1; specifically, the magnets 13 can be electromagnets or switch magnets, and the magnets 13 are used to assist in magnetically fixing the transparent substrate 1 and the semi-sectioned elbow blank 14 to prevent the semi-sectioned elbow blank 14 from shifting during measurement.

[0052] As Figure 8 , it further includes a support table 17 for placing the semi-sectioned elbow blank 14. The cross-section of the tabletop side of the support table 17 is a toothed structure; when placing, both ends of the semi-sectioned elbow blank 14 are located outside the support table 17 to ensure the stability of the placement.

[0053] As Figure 1 、 Figure 3 or Figure 2 Figure 4As shown, at least one of the first distance measuring tool 8 and the second distance measuring tool 10 is a distance measuring straightedge, and the distance measuring straightedge is placed vertically. The other one is a distance measuring straightedge or a laser distance measurer. When the other one is a distance measuring straightedge, it is placed horizontally. When the other one is a laser distance measurer, it is ensured that the laser of the laser distance measurer can hit the vertically placed distance measuring straightedge.

[0054] As Figure 5 , Figure 8 shown, L-shaped connecting hooks 15 are arranged at both ends of the slide rail 2. The vertical part of the connecting hook 15 is connected to the slide rail 2, and the horizontal part is arranged parallel to the slide rail 2. The slide rail 2 is slidably connected to the transparent substrate 1 through the connecting hook 15. A chute 201 with a T-shaped longitudinal section is formed on the slide rail 2, and the protractor 4 is slidably connected to the chute 201. The first locking member 3 includes two locking seats 301. The two locking seats 301 are respectively located at the left and right ends of the chute 201. A first locking bolt 302 is threadedly connected to the locking seat 301. A through hole 202 is provided on the slide rail 2 corresponding to the end of the first locking bolt 302. When the end of the first locking bolt 302 passes through the through hole 202 and abuts against the transparent substrate 1, the top surface of the locking seat 301 abuts against the top surface of the chute 201, and the position of the slide rail 2 is locked. By loosening the first locking bolt 302, the height of the slide rail 2 is adjusted. After adjusting to a proper position, the first locking bolt 302 is tightened again so that the end of the first locking bolt 302 abuts against the transparent substrate 1 to lock and fix the slide rail 2.

[0055] As Figure 7 , the second locking member 5 includes a second locking bolt and a slider 16. The slider 16 is slidably connected in the slide rail 2, and the second locking bolt passes through the protractor 4 and is threadedly connected to the slider 16.

[0056] As Figure 6 shown, a hinge shaft 701 is arranged at the axial center position of the protractor 4. The angle indicating handle 6 is hinged to the protractor 4 through the hinge shaft 701. The third locking member 7 includes a locking sleeve 702 threadedly connected to the hinge shaft 701. When the end of the locking sleeve 702 abuts against the angle indicating handle 6, the angle indicating handle 6 is locked. In this embodiment, in order to ensure an increased abutting area between the locking sleeve 702 and the angle indicating handle 6, an arched gasket 703 is installed between the locking sleeve 702 and the angle indicating handle 6. The arched gasket 703 can be made of rubber material or elastic metal material.

[0057] The measuring device in the present invention integrates functions of angle measurement, radius measurement and center positioning, reduces measurement steps and equipment requirements, and improves measurement efficiency; the transparent substrate 1 is composed of several unit substrates connected by hinges, and the slide rail 2 is designed to be adjustable, enabling the device to adapt to elbow blanks 14 of different sizes and shapes; the design of the magnet 13 fixing and the support table 17 ensures the stability of the half-sectioned elbow blank 14 during the measurement process, avoiding displacement and affecting the measurement results; the device and method have significant advantages such as high precision, simple operation, strong adaptability and good stability in the measurement of the bending angle and radius of the high-pressure elbow blank 14.

[0058] The above are only the preferred embodiments of the present invention that can be implemented, and do not limit the scope of rights of the present invention. Any equivalent changes made by using the content of the specification and drawings of the present invention are included in the scope of rights of the present invention.

Claims

1. A measuring device for the bending angle and center height of a high-pressure elbow blank, characterized in that: It includes a transparent substrate (1) placed on a semi - cut elbow blank (14). A horizontally - arranged slide rail (2) is slidably connected to the transparent substrate (1). The slide rail (2) can slide up and down along the transparent substrate (1) and is locked and fixed by a first locking member (3). A protractor (4) is slidably connected to the slide rail (2). A second locking member (5) is provided on the protractor (4) to lock the protractor (4) on the slide rail (2). Angle scales are marked on the semi - circular edge of the protractor (4), and the straight edge of the protractor (4) is arranged parallel to the slide rail (2) and marked with length scales. It further includes an angle - indicating handle (6). The angle - indicating handle (6) is hingedly connected to the axis of the protractor (4) and is locked and fixed by a third locking member (7). The part of the angle - indicating handle (6) above the hinge point of the axis of the protractor (4) extends towards the angle scale of the protractor (4) to indicate the bending angle. A first distance - measuring tool (8) is provided on the angle - indicating handle (6). An auxiliary scale (9) is provided at the lower right - hand position of the transparent substrate (1). A second distance - measuring tool (10) is fixed at the middle position of the auxiliary scale (9). The length scales on the protractor (4) and the auxiliary scale (9) on the transparent substrate (1) are both symmetrically arranged about the central axis. When the first distance - measuring tool (8) is on the center line of the A - end of the semi - cut elbow blank (14) and the second distance - measuring tool (10) is on the center line of the B - end of the semi - cut elbow blank (14), the intersection point of the first distance - measuring tool (8) and the second distance - measuring tool (10) is the bending center of the semi - cut elbow blank (14). The reading of the first distance - measuring tool (8) is the center height of the A - end of the semi - cut elbow blank (14), the reading of the second distance - measuring tool (10) is the center height of the B - end of the semi - cut elbow blank (14), and the reading of the angle - indicating handle (6) on the angle scale is the bending angle. Two transparent connecting plates (11) are symmetrically arranged about the axis on the protractor (4). A through - length adjusting straightedge (12) is connected to the ends of the two transparent connecting plates (11) away from the protractor (4). The scales on the two transparent connecting plates (11) and the adjusting straightedge (12) are all symmetrically arranged about the central axis of the adjusting straightedge (12). The adjusting straightedge (12) is arranged parallel to the straight edge of the protractor (4). The transparent connecting plates (11) are hingedly connected to the protractor (4), the transparent connecting plates (11) are hingedly connected to the adjusting straightedge (12), and the angle - indicating handle (6) is hingedly connected to the adjusting straightedge (12). The hinge point of the angle - indicating handle (6) and the adjusting straightedge (12) is on the central axis of the adjusting straightedge (12).

2. The bending angle and center height measuring device for the high-pressure elbow blank according to claim 1, wherein: A number of magnets (13) for fixing the semi - cut elbow blank (14) are provided on the transparent substrate (1).

3. The measuring device for the bending angle and center height of a high-pressure elbow blank according to claim 2, wherein: The magnet (13) is an electromagnet or a switch magnet.

4. A measuring device for the bending angle and center height of a high-pressure elbow blank according to claim 1, characterized in that: It further includes a support table (17) for placing the semi - cut elbow blank (14). The cross - section of the tabletop side of the support table (17) is a toothed structure.

5. A measuring device for the bending angle and center height of a high-pressure elbow blank according to claim 1, characterized in that: At least one of the first distance - measuring tool (8) and the second distance - measuring tool (10) is a distance - measuring straightedge, and the other is a distance - measuring straightedge or a laser rangefinder.

6. The bending angle and center height measuring device for the high-pressure elbow blank according to claim 1, wherein: Both ends of the slide rail (2) are provided with L-shaped connecting hooks (15). The vertical part of the connecting hook (15) is connected to the slide rail (2), and the horizontal part is arranged parallel to the slide rail (2). The slide rail (2) is slidably connected to the transparent substrate (1) through the connecting hook (15); a chute (201) with a T-shaped longitudinal section is formed on the slide rail (2), and the protractor (4) is slidably connected to the chute (201); The first locking member (3) includes two locking seats (301). The two locking seats (301) are respectively located at the left and right ends of the chute (201). A first locking bolt (302) is threadedly connected to the locking seat (301). A through hole (202) is provided on the slide rail (2) corresponding to the end of the first locking bolt (302). When the end of the first locking bolt (302) passes through the through hole (202) and abuts against the transparent substrate (1), the position of the slide rail (2) is locked.

7. A measuring device for the bending angle and center height of a high-pressure elbow blank according to claim 1, characterized in that: The second locking member (5) includes a second locking bolt and a slider (16). The slider (16) is slidably connected in the slide rail (2), and the second locking bolt passes through the protractor (4) and is threadedly connected to the slider (16).

8. A device for measuring the bending angle and center height of a high-pressure elbow blank according to claim 1, characterized in that: A hinge shaft (701) is arranged at the axis position of the protractor (4). The angle indicating handle (6) is hinged to the protractor (4) through the hinge shaft (701); the third locking member (7) includes a locking sleeve (702) threadedly connected to the hinge shaft (701). When the end of the locking sleeve (702) abuts against the angle indicating handle (6), the angle indicating handle (6) is locked.

9. A method for measuring the bending angle and center height of a high-pressure elbow blank, characterized in that, When measuring using a device for measuring the bending angle and center height of a high-pressure elbow blank as described in any one of claims 1 to 8, the following steps are included: S1: Select an elbow blank to be detected; S2: Cut the elbow blank in half. When cutting in half, it should be cut along the center line to obtain a half-cut elbow blank (14); S3: Place the transparent substrate (1) on the cut surface of the half-cut elbow blank (14). Move the transparent substrate (1) while observing the position of the auxiliary scale (9) relative to the inner wall of the half-cut elbow blank (14). When the scale readings on the auxiliary scale (9) of the two inner walls at the B end of the half-cut elbow blank (14) are the same, the second distance measuring tool (10) is located on the center line of the B end of the half-cut elbow blank (14); S4: Magnetically fix the transparent substrate (1) and the half-cut elbow blank (14) with a magnet (13); S5: Adjust the height of the slide rail (2) so that the measurement starting point of the first distance measuring tool (8) is located at the edge of the A end of the half-cut elbow blank (14); S6: Slide the protractor (4). By observing the position of the length scale of the protractor (4) relative to the inner wall of the A end of the half-cut elbow blank (14), make the axis of the protractor (4) located on the center line of the A end of the half-cut elbow blank (14); S7: Rotate the angle indicating handle (6) so that the first distance measuring tool (8) is located on the center line of the A end of the half-cut elbow blank (14); Adjust the angle indicating handle (6) so that the first distance measuring tool (8) is located on the center line of the A end of the elbow blank. Assist the adjustment by adjusting the straight ruler (12). Since the scales on the straight ruler (12) are symmetrically arranged about the central axis, horizontally move the straight ruler (12) so that the readings on the straight ruler of the inner side walls on both sides of the half-sectioned elbow blank (14) are the same. S8: The intersection point of the first distance measuring tool (8) and the second distance measuring tool (10) is the bending center of the half-sectioned elbow blank (14). The reading of the first distance measuring tool (8) is the center height of the A end of the half-sectioned elbow blank (14), the reading of the second distance measuring tool (10) is the center height of the B end of the half-sectioned elbow blank (14), and the reading of the angle indicating handle (6) on the angle scale is the bending angle of the half-sectioned elbow blank (14).

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