Device and method for measuring bending angle and center height of high-pressure elbow blank

Abstract

The invention relates to the technical field of elbow blank quality detection, in particular to a high-pressure elbow blank bending angle and center height measuring device and method.The high-pressure elbow blank bending angle and center height measuring device comprises a transparent substrate, a transversely-arranged sliding rail is connected to the transparent substrate in a sliding mode, a protractor is connected to the sliding rail in a sliding mode, and angle scales and length scales are arranged on the protractor; the angle indicating handle is used for indicating a bending angle and is hinged with the axis of the protractor; a first distance measuring tool is arranged on the angle indicating handle; auxiliary scales are arranged on the lower portion of the transparent substrate close to the right side, and a second distance measuring tool is fixed to the middle of the auxiliary scales. The device has the remarkable advantages of high-precision measurement, multifunctional integration, convenience in operation, high stability, wide application range and the like; through integrated design and symmetrical scale arrangement, accurate measurement of geometric parameters of the elbow is realized, and measurement errors are reduced; the slide rail, the protractor and other tools cooperate to improve the measurement efficiency and the operation flexibility.

Description

Technical Field

[0001] The invention relates to the technical field of elbow blank quality detection, in particular to a device and method for measuring the bending angle and center height of a high-pressure elbow blank. Background Art

[0002] High-pressure elbow blanks refer to the initial materials or semi-finished products used to manufacture high-pressure elbows, usually metal materials, which can become finished products after subsequent processing; the molding quality of high-pressure elbow blanks directly affects the quality of subsequent processing and finished products. High-quality blanks can improve processing efficiency, reduce scrap rate, and ensure the performance and service life of finished products; therefore, the same batch of high-pressure elbow blanks usually need to be sampled after production; the sampling inspection of high-pressure elbow blanks is to ensure that their quality meets the standards, and usually it is necessary to use calipers, micrometers and other tools to check the following key items: outer diameter, inner diameter, wall thickness, centerline length, center height, etc.

[0003] Among them, the bending angle and center height are important evaluation factors for evaluating the forming quality of high-pressure elbow blanks; in the existing quality sampling, the measurement of the bending angle and center height is usually a major difficulty for quality inspectors for the following reasons: 1. The actual position of the bending angle and center height is inside the blank or outside the bending angle, which is not easy to measure; 2. Since the high-pressure elbow is usually arc-shaped, the shape of the curved surface increases the complexity of the measurement; 3. Since the surface of the high-pressure elbow blank is rough, there are burrs and unevenness, which affects the contact of the measuring tool. After the ruler is placed on it, it is easy to tilt or warp, so it is not convenient to measure; 4. The high-pressure elbow blank has processing allowance and unstable size, which further increases the difficulty of measurement.

[0004] Therefore, how to quickly and accurately measure the bending angle and center height of the high-pressure elbow blank has become a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a device and method for measuring the bending angle and center height of a high-pressure elbow blank, which are convenient for measuring the bending angle and center height of the elbow blank.

[0006] The technical solution adopted by the present invention to solve its technical problem is: A device for measuring the bending angle and center height of a high-pressure elbow blank comprises a transparent substrate placed on the elbow blank cut in half, a transversely arranged slide rail being slidably connected to the transparent substrate, the slide rail being able to slide up and down along the transparent substrate and being locked and fixed by a first locking piece; a protractor being slidably connected to the slide rail, a second locking piece being arranged on the protractor and being able to lock the protractor on the slide rail, an angle scale being marked on the semicircular edge of the protractor, a length scale being marked on the straight edge of the protractor being arranged parallel to the slide rail; an angle indicating handle being also included, the angle indicating handle being hingedly connected to the protractor axis and being locked and fixed by a third locking piece; the angle indicating handle being located on the upper side of the protractor axis hinge point and extending from the angle scale of the protractor to indicate the bending angle ... being able to lock the protractor on the slide rail A first distance measuring tool is arranged on the indicating handle; an auxiliary scale is arranged on the right side of the lower part of the transparent substrate, and a second distance measuring tool is fixed at the middle position of the auxiliary scale; the length scale 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 elbow blank cut in half, and the second distance measuring tool is located on the center line of the B end of the elbow blank cut in half, the intersection of the first distance measuring tool and the second distance measuring tool is the bending center of the elbow blank cut in half, the reading of the first distance measuring tool is the center height of the A end of the elbow blank cut in half, the reading of the second distance measuring tool is the center height of the B end of the elbow blank cut in half, and the reading of the angle indicating handle on the angle scale is the bending angle.

[0007] Preferably, a further technical solution of the present invention is: Preferably, two transparent connecting plates are symmetrically arranged on the protractor about the axis, and a full-length adjusting ruler is connected to one end of the two transparent connecting plates away from the protractor. The two transparent connecting plates and the scales on the adjusting ruler are symmetrically arranged about the central axis of the adjusting ruler, and the adjusting ruler is arranged parallel to the straight edge of the protractor. The transparent connecting plates and the protractor, the transparent connecting plates and the adjusting ruler, and the angle indicating handle and the adjusting ruler are all hingedly connected, and the hinge point of the angle indicating handle and the adjusting ruler is located on the central axis of the adjusting ruler.

[0008] Preferably, a plurality of magnets for fixing the elbow blank cut in half are arranged on the transparent substrate.

[0009] Preferably, the magnet is an electromagnet or a switch magnet; the magnet (such as an electromagnet or a switch magnet) arranged on the transparent substrate can firmly fix the elbow blank split in half to prevent displacement during the measurement process and ensure measurement stability.

[0010] Preferably, it also includes a support table for placing the elbow blank cut in half, and the side section of the table top of the support table is a tooth-shaped structure.

[0011] 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 rangefinder.

[0012] Preferably, L-shaped connecting hooks are provided at both ends of the slide rail, the vertical portion of the connecting hooks is connected to the slide rail, and the horizontal portion is arranged parallel to the slide rail, and the slide rail is slidably connected to the transparent substrate through the connecting hooks; a slide groove with a T-shaped longitudinal section is provided on the slide rail, and the protractor is slidably connected to the slide groove; the first locking member includes two locking seats, and the two locking seats are respectively located at the left and right ends of the slide groove, and the locking seat is threadedly connected with a first locking bolt, and a through hole is provided on the slide rail corresponding to the end of the first locking bolt, and 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.

[0013] Preferably, the second locking member includes a second locking bolt and a slider, the slider is slidably connected in the slide rail, and the second locking bolt passes through the protractor and is threadedly connected to the slider.

[0014] Preferably, a hinge shaft is provided 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, and when the end of the locking sleeve abuts against the angle indicating handle, the angle indicating handle is locked.

[0015] 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 comprises the following steps: S1: Select the elbow blank to be tested; S2: Split the elbow blank in half, and cut along the center line to obtain the elbow blank split in half: S3: placing a transparent substrate on the cross section of the elbow blank cut in half, moving the transparent substrate and observing the position of the auxiliary scale relative to the inner wall of the elbow blank cut in half, when the scale readings of the inner wall of the B end of the elbow blank cut in half on the auxiliary scale are the same, the second distance measuring tool is located on the center line of the B end of the elbow blank cut in half; S4: Using a magnet to fix the transparent substrate and the elbow blank cut in half; S5: adjusting the height of the slide rail so that the measuring starting point of the first distance measuring tool is located at the edge of the A end of the elbow blank cut in half; S6: Slide the protractor, and make the protractor axis located on the center line of the A end of the elbow blank cut in half by observing the position of the protractor length scale relative to the inner wall of the A end of the elbow blank cut in half; S7: Turn the angle indicating handle so that the first distance measuring tool is located on the center line of the A end of the elbow blank cut in half; S8: The intersection of the first distance measuring tool and the second distance measuring tool is the bending center of the elbow blank split in half, the reading of the first distance measuring tool is the center height of the A end of the elbow blank split in half, the reading of the second distance measuring tool is the center height of the B end of the elbow blank split in half, and the reading of the angle indicating handle on the angle scale is the bending angle of the elbow blank split in half.

[0016] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: The measuring device and its measuring method have significant advantages such as high-precision measurement, multi-functional integration, convenient operation, strong stability, and wide application range. Through integrated design and symmetrical scale setting, accurate measurement of elbow geometric parameters is achieved, reducing measurement errors. The synergy of slide rails, protractors, and distance measuring tools improves measurement efficiency and operational flexibility. The magnetic fixation and locking mechanism ensures the stability of the measurement process. The transparent substrate and visual 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the structure of a measuring device in use according to an embodiment of the present invention; Figure 2 is a schematic structural diagram of a measuring device in an embodiment of the present invention; Figure 3 is a schematic structural diagram of another measuring device in use according to an embodiment of the present invention; Figure 4 is a schematic structural diagram of another measuring device in an embodiment of the present invention; Figure 5 is a schematic cross-sectional view of a connection portion of a first locking member in an embodiment of the present invention; Figure 6 is a schematic cross-sectional view of a connection portion of a third locking member in an embodiment of the present invention; Figure 7 is a schematic cross-sectional view of a connection portion of a second locking member in an embodiment of the present invention; Figure 8 1 is a schematic diagram of the side view structure of the measuring device in the embodiment of the present invention when in use.

[0018] Explanation of the reference numerals in the accompanying drawings: 1. transparent substrate; 2. slide rail; 201. slide groove; 202. through hole; 3. first locking piece; 301. locking seat; 302. first locking bolt; 4. protractor; 5. second locking piece; 6. angle indicating handle; 601. indicating mark; 7. third locking piece; 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 ruler; 13. magnet; 14. elbow blank cut in half; 15. connecting hook; 16. slider; 17. support. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific 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] like Figures 1 to 8 As shown, this embodiment provides a device for measuring the bending angle and center height of a high-pressure elbow blank, comprising a transparent substrate 1 placed on a half-cut elbow blank 14, the transparent substrate 1 can be formed by connecting a plurality of unit substrates through hinges; a transversely 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, and a second locking member 5 is provided on the protractor 4 to lock the protractor 4 on the slide rail 2, the semicircular edge of the protractor 4 is marked with an angle scale, and the straight edge of the protractor 4 is arranged parallel to the slide rail 2 and marked with a length scale; it also 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 angle indicating handle 6 is located on the upper side of the axis hinge point of the protractor 4 and extends from the angle scale of the protractor 4, and an indicating member is provided at a position close to the angle scale Mark 601 is used to indicate the bending angle; a first distance measuring tool 8 is arranged on the angle indicating handle 6; an auxiliary scale 9 is arranged on the right side of the lower part 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 scale 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 elbow blank 14 split in half, and the second distance measuring tool 10 is located on the center line of the B end of the elbow blank 14 split in half, the intersection of the first distance measuring tool 8 and the second distance measuring tool 10 is the bending center of the elbow blank 14 split in half, the reading of the first distance measuring tool 8 is the center height of the A end of the elbow blank 14 split in half, the reading of the second distance measuring tool 10 is the center height of the B end of the elbow blank 14 split in half, and the reading of the angle indicating handle 6 on the angle scale is the bending angle of the elbow blank 14 split in half.

[0021] When the device for measuring the bending angle and center height of a high-pressure elbow blank is used, the specific method of use is as follows, that is, the present invention also discloses a method for measuring the center height of a high-pressure elbow blank: S1: Select the elbow blank to be tested.

[0022] S2: Split the elbow blank in half, and cut along the center line to obtain the elbow blank 14 split in half.

[0023] S3: Place the transparent substrate 1 on the cross-section of the elbow blank 14 cut in half, move the transparent substrate 1 and observe the position of the auxiliary scale 9 relative to the inner wall of the elbow blank 14 cut in half. When the inner walls on both sides of the B end of the elbow blank 14 cut in half have the same scale reading on the auxiliary scale 9, the second distance measuring tool 10 is located on the center line of the B end of the elbow blank 14 cut in half.

[0024] S4: Use magnet 13 to magnetically fix transparent substrate 1 and elbow blank 14 cut in half.

[0025] 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 split in half; when the ends (A end and B end) of the elbow blank 14 split in half are uneven, since subsequent processing requires the end surface 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 end of the elbow blank 14 split in half.

[0026] S6: Slide the protractor 4, and make the axis of the protractor 4 located on the center line of the A end of the elbow blank 14 cut in half 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.

[0027] 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.

[0028] S8: The intersection of the first distance measuring tool 8 and the second distance measuring tool 10 is the bending center of the elbow blank 14 split in half, the reading of the first distance measuring tool 8 is the center height of the A end of the elbow blank 14 split in half, the reading of the second distance measuring tool 10 is the center height of the B end of the elbow blank 14 split in half, and the reading of the angle indicating handle 6 on the angle scale is the bending angle of the elbow blank 14 split in half.

[0029] Since the elbow blank is cut along the center line, the center height of the A end of the elbow blank 14 cut in half, the center height of the B end of the elbow blank 14 cut in half, and the bending angle of the elbow blank 14 cut in half 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.

[0030] Furthermore, two transparent connecting plates 11 are symmetrically arranged on the protractor 4 about the axis, and a full-length adjusting ruler 12 is connected to the two transparent connecting plates 11 at one end away from the protractor 4. The scales on the two transparent connecting plates 11 and the adjusting ruler 12 are symmetrically arranged about the central axis of the adjusting ruler 12, and the adjusting ruler 12 is arranged parallel to the straight edge of the protractor 4. The transparent connecting plates 11 and the protractor 4, the transparent connecting plates 11 and the adjusting ruler 12, and the angle indicating handle 6 and the adjusting ruler 12 are all hingedly connected; that is, when the adjusting ruler 12 is translated, the adjusting ruler 12, the two transparent connecting plates 11 and the straight edge of the protractor 4 always form a parallelogram structure; the hinge point of the angle indicating handle 6 and the adjusting ruler 12 is located on the central axis of the adjusting ruler 12; after the angle indicating handle 6 is locked, the parallelogram formed by the adjusting ruler 12, the two transparent connecting plates 11 and the straight edge of the protractor 4 is also locked and fixed.

[0031] When in use, in step S7, the angle indicating handle 6 is adjusted 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. The adjustment can be assisted by the adjusting ruler 12. Since the scales on the adjusting ruler 12 are symmetrically arranged about the central axis, the adjusting ruler 12 is moved horizontally so that the readings of the inner side walls on both sides of the elbow blank 14 cut in half on the adjusting ruler 12 are consistent, which facilitates the rapid adjustment of 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.

[0032] like Figures 1 to 4 As shown, a plurality of magnets 13 for fixing the elbow blank 14 split in half are arranged on the transparent substrate 1; specifically, the magnet 13 can be an electromagnet or a switch magnet, and the magnet 13 is used to assist in magnetically fixing the transparent substrate 1 and the elbow blank 14 split in half to avoid displacement of the elbow blank 14 split in half during measurement.

[0033] like Figure 8 It also includes a support platform 17 for placing the elbow blank 14 cut in half, and the side cross-section of the support platform 17 is a toothed structure; when placing, both ends of the elbow blank 14 cut in half are located on the outside of the support platform 17 to ensure the stability of placement.

[0034] like Figure 1 , Figure 3 or Figure 2 Figure 4 As shown, at least one of the first distance measuring tool 8 and the second distance measuring tool 10 is a distance measuring ruler, and the distance measuring ruler is placed vertically, and the other is a distance measuring ruler or a laser rangefinder. When the other is a distance measuring ruler, it is placed horizontally, and when the other is a laser rangefinder, it is ensured that the laser of the laser rangefinder can hit the vertically placed distance measuring ruler.

[0035] like Figure 5 , Figure 8 As shown, L-shaped connecting hooks 15 are provided at both ends of the slide rail 2, the vertical portion of the connecting hook 15 is connected to the slide rail 2, and the horizontal portion is arranged parallel to the slide rail 2, and the slide rail 2 is slidably connected to the transparent substrate 1 through the connecting hook 15; a slide groove 201 with a T-shaped longitudinal section is opened on the slide rail 2, and the protractor 4 is slidably connected to the slide groove 201; the first locking member 3 includes two locking seats 301, and the two locking seats 301 are respectively located at the left and right ends of the slide groove 201, and the locking seats 301 are threadedly connected with the first locking bolt 302, and 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 on the transparent substrate 1, the top surface of the locking seat 301 abuts against the top surface of the slide groove 201, and the position of the slide rail 2 is locked. The first locking bolt 302 is loosened to adjust the height of the slide rail 2. After adjusting to a suitable 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.

[0036] like 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 . The second locking bolt passes through the protractor 4 and is threadedly connected to the slider 16 .

[0037] like Figure 6 , a hinge shaft 701 is provided at the axis center of the protractor 4, and 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, and 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 increase the 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, and the arched gasket 703 can be made of rubber material or elastic metal material.

[0038] The measuring device of the present invention integrates the functions of angle measurement, radius measurement and center positioning, reduces the measurement steps and equipment requirements, and improves the measurement efficiency; the transparent substrate 1 is composed of several unit substrates connected by hinges, and the slide rail 2 is adjustable, so that the device can adapt to elbow blanks 14 of different sizes and shapes; the magnet 13 fixation and the support 17 design ensure the stability of the elbow blank 14 split in half during the measurement process, and avoid displacement affecting the measurement results; the device and method have significant advantages in the measurement of the bending angle and radius of the high-pressure elbow blank 14, such as high precision, simple operation, strong adaptability and good stability.

[0039] The above description is only the preferred embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made by using the contents of the present invention specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A device for measuring the bending angle and center height of a high-pressure elbow blank, characterized in that: It comprises a transparent substrate (1) placed on a half-cut elbow blank (14), a transversely arranged slide rail (2) being slidably connected to the transparent substrate (1), the slide rail (2) being able to slide up and down along the transparent substrate (1) and being locked and fixed by a first locking member (3); The protractor (4) is slidably connected to the slide rail (2), and a second locking member (5) is provided on the protractor (4) for locking the protractor (4) on the slide rail (2). The semicircular edge of the protractor (4) is marked with an angle scale, and the straight edge of the protractor (4) is arranged parallel to the slide rail (2) and is marked with a length scale. It also includes an angle indicating handle (6), which is hingedly connected to the axis of the protractor (4) and is locked and fixed by a third locking member (7); the angle indicating handle (6) is located on the upper side of the axis hinge point of the protractor (4) and extends from 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 on the right side of the lower part 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 scale 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 located on the center line of the A end of the elbow blank (14) split in half, and the second distance measuring tool (10) is located on the center line of the B end of the elbow blank (14) split in half, the intersection of the first distance measuring tool (8) and the second distance measuring tool (10) is the bending center of the elbow blank (14) split in half, the reading of the first distance measuring tool (8) is the center height of the A end of the elbow blank (14) split in half, the reading of the second distance measuring tool (10) is the center height of the B end of the elbow blank (14) split in half, and the reading of the angle indicating handle (6) on the angle scale is the bending angle.

2. A device for measuring the bending angle and center height of a high-pressure elbow blank according to claim 1, characterized in that: Two transparent connecting plates (11) are symmetrically arranged on the protractor (4) about the axis. One end of the two transparent connecting plates (11) away from the protractor (4) is connected to a full-length adjusting ruler (12). The scales on the two transparent connecting plates (11) and the adjusting ruler (12) are symmetrically arranged about the central axis of the adjusting ruler (12). The adjusting ruler (12) is arranged parallel to the straight edge of the protractor (4). The transparent connecting plates (11) and the protractor (4), the transparent connecting plates (11) and the adjusting ruler (12), and the angle indicating handle (6) and the adjusting ruler (12) are all hingedly connected. The hinge point of the angle indicating handle (6) and the adjusting ruler (12) is located on the central axis of the adjusting ruler (12).

3. The device for measuring the bending angle and center height of a high-pressure elbow blank according to claim 1, characterized in that: A plurality of magnets (13) for fixing the elbow blank (14) cut in half are arranged on the transparent substrate (1).

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

5. The device for measuring the bending angle and center height of a high-pressure elbow blank according to claim 1, characterized in that: It also includes a support platform (17) for placing the elbow blank (14) cut in half, and the side cross-section of the support platform (17) is a tooth-shaped structure.

6. The device for measuring 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 ruler, and the other is a distance measuring ruler or a laser distance meter.

7. The device for measuring the bending angle and center height of a high-pressure elbow blank according to claim 1, characterized in that: L-shaped connecting hooks (15) are provided at both ends of the slide rail (2); the vertical portion of the connecting hook (15) is connected to the slide rail (2), and the horizontal portion is arranged parallel to the slide rail (2); the slide rail (2) is slidably connected to the transparent substrate (1) via the connecting hook (15); a slide groove (201) having a T-shaped longitudinal section is provided on the slide rail (2), and the protractor (4) is slidably connected to the slide groove (201); The first locking member (3) comprises two locking seats (301), the two locking seats (301) are respectively located at the left and right ends of the slide groove (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), and 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.

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

9. The 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 provided at the axis center of the protractor (4), and the angle indicating handle (6) is hinged to the protractor (4) via the hinge shaft (701); the third locking member (7) comprises a locking sleeve (702) threadedly connected to the hinge shaft (701), and when the end of the locking sleeve (702) abuts against the angle indicating handle (6), the angle indicating handle (6) is locked.

10. A method for measuring the bending angle and center height of a high-pressure elbow blank, characterized in that: The method of measuring the bending angle and center height of a high-pressure elbow blank using a device for measuring the bending angle and center height of a high-pressure elbow blank as claimed in any one of claims 1 to 9 comprises the following steps: S1: Select the elbow blank to be tested; S2: Split the elbow blank in half, cutting along the center line to obtain a split elbow blank (14): S3: placing the transparent substrate (1) on the cross section of the elbow blank (14) cut in half, moving 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 of the inner walls on both sides of the B end of the elbow blank (14) cut in half on the auxiliary scale (9) 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; S4: Using a magnet (13) to magnetically fix the transparent substrate (1) and the elbow blank (14) cut in half; S5: adjusting 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; S6: Slide the protractor (4) to make the axis of the protractor (4) located on the center line of the A end of the elbow blank (14) cut in half 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; S7: rotating 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; S8: The intersection of the first distance measuring tool (8) and the second distance measuring tool (10) is the bending center of the elbow blank (14) split in half, the reading of the first distance measuring tool (8) is the center height of the A end of the elbow blank (14) split in half, the reading of the second distance measuring tool (10) is the center height of the B end of the elbow blank (14) split in half, and the reading of the angle indicating handle (6) on the angle scale is the bending angle of the elbow blank (14) split in half.

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