Method for measuring the bending angle of a bending catheter

Abstract

This invention discloses a method for measuring the bending angle of a curved conduit, belonging to the field of YBC coordinate design measurement and CNC bending forming technology of conduits. It solves the problems of long trial-and-error cycles and complex processes in existing methods for measuring the bending angle of curved conduits. The method includes positioning a first ruler, a third ruler, and a fourth ruler, such that the first ruler is arranged along the axial direction of a first straight pipe segment and lies in the same plane; the second ruler is arranged along the axial direction of a second straight pipe segment and lies in the same plane; the third ruler is arranged along the axial direction of a second straight pipe segment and lies in the same plane; and the fourth ruler is arranged along the axial direction of a third straight pipe segment and lies in the same plane. The angle between the guide arc plate and the sliding arc plate is measured to obtain the bending angle of the curved conduit. This invention can be used for measuring the bending angle of curved conduits.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of numerical control bending forming of a pipe, and particularly relates to a bending angle measurement method for a bent pipe. BACKGROUND

[0002] Currently, in the field of pipe measurement and bending forming, quality control of the positions of two ends is generally performed by trial fitting of a tooling. In pipe bending manufacturing, measurement and feedback of a deviation value determine the number of bending adjustments and the output precision of a final product. The measurement method and the precision of a measurement tool greatly affect the deviation value. Moreover, after product assembly, the installation conditions of the pipe are met, and then sampling of the pipe is performed, so that the pipe eligibility can be finally determined.

[0003] Therefore, a general pipe manufacturing process, including bending manufacturing, assembly, sampling adjustment of the pipe, and re-bending and re-adjustment, needs a large amount of trial and error time period, waiting, coordination, and repeated iteration. SUMMARY

[0004] In view of the above analysis, the present application aims to provide a bending angle measurement method for a bent pipe, which solves the problems of long trial and error period and complex process in the bending angle measurement of a bent pipe in the prior art.

[0005] The purpose of the present application is mainly achieved by the following technical solutions:

[0006] The present application provides a bending angle measurement method for a bent pipe, which includes the following steps:

[0007] Step 1: providing a bent pipe and a measuring scale, the measuring scale including a first ruler, a second ruler, a third ruler, a fourth ruler, a first connecting scale plate, a second connecting scale plate, a guide circular arc plate, and a sliding circular arc plate, the guide circular arc plate and the sliding circular arc plate being concentrically arranged, being slidably connected, and having a fixed relative position, the first connecting scale plate and the second connecting scale plate being arranged along the radial direction of the guide circular arc plate, the second ruler being fixedly connected to the guide circular arc plate through the first connecting scale plate, and the third ruler being fixedly connected to the sliding circular arc plate through the second connecting scale plate; the first ruler and the second ruler being rotationally connected and having a fixed relative position, and the third ruler and the fourth ruler being rotationally connected and having a fixed relative position;

[0008] Step 2: positioning the first ruler, the first ruler, the third ruler, and the fourth ruler, so that the first ruler is arranged along the axial direction of the first straight pipe segment and located in the same plane, the second ruler is arranged along the axial direction of the second straight pipe segment and located in the same plane, the third ruler is arranged along the axial direction of the second straight pipe segment and located in the same plane, and the fourth ruler is arranged along the axial direction of the third straight pipe segment and located in the same plane;

[0009] Step 3: Measure the angle between the guide circular arc plate and the sliding circular arc plate, and obtain the included angle between the plane formed by the first ruler and the second ruler and the plane formed by the third ruler and the fourth ruler, which is the bending angle of the curved pipe.

[0010] Further, in step 2, the fitting gap between the first ruler and the first straight pipe segment is adjusted so that the first ruler tightly abuts the side wall of the first straight pipe segment.

[0011] Further, in step 2, the fitting gap between the second ruler and the second straight pipe segment is adjusted so that the second ruler tightly abuts the side wall of the second straight pipe segment.

[0012] Further, in step 2, the fitting gap between the third ruler and the second straight pipe segment is adjusted so that the third ruler tightly abuts the side wall of the second straight pipe segment.

[0013] Further, in step 2, the fitting gap between the fourth ruler and the third straight pipe segment is adjusted so that the fourth ruler tightly abuts the side wall of the third straight pipe segment.

[0014] Further, the guide circular arc plate has an annular hole formed along the circumference of the guide circular arc plate; the sliding circular arc plate includes a circular arc guide block, a first circular arc plate body, a second circular arc plate body, and a locking screw and a locking nut that cooperate with each other, the circular arc guide block is located in the annular hole of the guide circular arc plate, the first circular arc plate body is located on one side of the guide circular arc plate, the second circular arc plate body is located on the other side of the guide circular arc plate, the circular arc guide block is located between the first circular arc plate body and the second circular arc plate body, and the locking screw passes through the first circular arc plate body, the circular arc guide block, and the second circular arc plate body and is connected with the locking nut.

[0015] Further, the fitting gap tolerance between the first circular arc plate body, the second circular arc plate body, the circular arc guide block, and the guide circular arc plate is not more than 0.01 mm.

[0016] Further, the measuring ruler further includes a support member, the support member includes a first gripper, a second gripper, a gripper guide block, and a gripper screw and a gripper nut that cooperate with each other, the gripper guide block is located in the annular hole, the connecting end of the first gripper is located on one side of the guide circular arc plate, the connecting end of the second gripper is located on the other side of the guide circular arc plate, the gripper guide block is located between the connecting end of the first gripper and the connecting end of the second gripper, and the gripper screw passes through the connecting end of the first gripper, the gripper guide block, and the connecting end of the second gripper and is connected with the gripper nut.

[0017] Further, the fitting gap tolerance between the first gripper, the second gripper, the gripper guide block, and the guide circular arc plate is not more than 0.01 mm.

[0018] Further, the inner arc surface of the support end of the first gripper and the second gripper has a radius of 6 mm to 10 mm.

[0019] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0020] The present application provides a bending angle measurement method for a bending conduit, which can accurately measure the bending angle, reduce the difficulty and workload of bending manufacturing, measurement and feedback, and revision procedures, reduce the repeated work caused by subjective judgment, greatly accelerate the optimization of the conduit and the production speed, and help to ensure the production progress.

[0021] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application, and together with the description serve to explain the principles of the present application. In the drawings:

[0023] Fig. 1a Structure diagram of the measuring scale in the bending angle measurement method for the bending conduit provided by the first embodiment of the present application;

[0024] Fig. 1b Another direction structure diagram of the measuring scale in the bending angle measurement method for the bending conduit provided by the first embodiment of the present application;

[0025] Fig. 2a Structure diagram of the second ruler in the bending angle measurement method for the bending conduit provided by the first embodiment of the present application;

[0026] Fig. 2b Assembly diagram of the first ruler and the second ruler in the bending angle measurement method for the bending conduit provided by the first embodiment of the present application;

[0027] Fig. 3a Partial diagram of the measuring scale in the bending angle measurement method for the bending conduit provided by the first embodiment of the present application;

[0028] Fig. 3b Another direction partial diagram of the measuring scale in the bending angle measurement method for the bending conduit provided by the first embodiment of the present application;

[0029] Fig. 4 Flow chart of the bending angle measurement method for the bending conduit provided by the first embodiment of the present application.

[0030] Reference signs:

[0031] 1 - first straight ruler; 2 - second straight ruler; 3 - third straight ruler; 4 - fourth straight ruler; 5 - curved conduit; 6 - guiding circular arc plate; 7 - sliding circular arc plate; 71 - circular arc guide block; 72 - first circular arc plate body; 73 - second circular arc plate body; 74 - locking screw; 8 - support; 81 - first gripper; 82 - second gripper; 83 - gripper guide block; 84 - gripper screw; 9 - annular hole; 10 - U-shaped clamp; 11 - blind hole; 12 - through hole; 13 - first fixing member; 14 - first fixing screw; 15 - first connecting ruler plate; 16 - first end fixing block; 17 - first end screw; 18 - second end fixing block; 19 - second end screw; 20 - second connecting ruler plate; 21 - third end fixing block; 22 - third end screw; 23 - fourth end fixing block; 24 - fourth end screw. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present application will be described in detail below with reference to the drawings, in which the drawings constitute a part of this application and illustrate embodiments of the present application together with the principles of the present application.

[0033] Embodiment One

[0034] The present embodiment provides a method for measuring the bending angle of a curved conduit 5, which comprises a first straight pipe segment, a first elbow pipe segment, a second straight pipe segment, a second elbow pipe segment and a third straight pipe segment connected in sequence, and the method comprises the following steps:

[0035] Step 1: providing a curved conduit 5 and a measuring ruler, the measuring ruler comprising a first straight ruler 1, a second straight ruler 2, a third straight ruler 3, a fourth straight ruler 4, a first connecting ruler plate 15, a second connecting ruler plate 20, a guiding circular arc plate 6 and a sliding circular arc plate 7, as shown in Figs. 1a to 3b The guiding circular arc plate 6 and the sliding circular arc plate 7 are concentrically arranged, and the two are slidingly connected and the relative positions can be fixed. The first connecting ruler plate 15 and the second connecting ruler plate 20 are arranged along the radial direction of the guiding circular arc plate 6 and the sliding circular arc plate 7. The second straight ruler 2 is fixedly connected with the guiding circular arc plate 6 through the first connecting ruler plate 15, and the third straight ruler 3 is fixedly connected with the sliding circular arc plate 7 through the second connecting ruler plate 20. The first straight ruler 1 and the second straight ruler 2 are rotationally connected and the relative positions can be fixed. The first straight ruler 1 is arranged along the axial direction of the first straight pipe segment and the side surface of the first straight ruler 1 is attached to the first straight pipe segment. The second straight ruler 2 is arranged along the axial direction of the second straight pipe segment and the side surface of the second straight ruler 2 is attached to the second straight pipe segment. The third straight ruler 3 and the fourth straight ruler 4 are rotationally connected and the relative positions can be fixed. The third straight ruler 3 is arranged along the axial direction of the second straight pipe segment and the side surface of the third straight ruler 3 is attached to the side surface of the second straight pipe segment. The fourth straight ruler 4 is arranged along the axial direction of the third straight pipe segment and the side surface of the fourth straight ruler 4 is attached to the side surface of the third straight pipe segment.

[0036] Step 2: Position the first ruler 1, the second ruler 2, the third ruler 3 and the fourth ruler 4, so that the first ruler 1 is arranged along the axial direction of the first straight pipe segment and in the same plane, the second ruler 2 is arranged along the axial direction of the second straight pipe segment and in the same plane, the third ruler 3 is arranged along the axial direction of the second straight pipe segment and in the same plane, and the fourth ruler 4 is arranged along the axial direction of the third straight pipe segment and in the same plane;

[0037] Step 3: Measure the angle between the guide circular arc plate 6 and the sliding circular arc plate 7, and the included angle (i.e. parameter B) between the plane formed by the first ruler 1 and the second ruler 2 and the plane formed by the third ruler 3 and the fourth ruler 4 can be obtained.

[0038] Compared with the prior art, the bending angle measurement method of the bending pipe provided by the embodiment can replace the existing bending manufacturing inspection fixture. In the case of limited site and conditions, for example, in the case of not having the condition of three-dimensional measurement scanning technology, the bending angle can be accurately measured, the difficulty and workload of the bending manufacturing, measurement and feedback, and correction procedures can be reduced, the repeated sampling work caused by subjective judgment is reduced, the speed of the pipe optimization and production is greatly accelerated, the production progress is guaranteed, and the method has the characteristics of simple operation, easy implementation, low cost, convenient and fast use, accurate measurement and the like.

[0039] In actual application, the measurement of the actual bending angle of the parameter B can be performed by using a conventional angle ruler, an electronic angle measuring instrument or a vernier angle measuring tool. Alternatively, a scale line or an angle vernier size line can be arranged on the guide circular arc plate 6, for directly measuring the included angle between the plane formed by the first ruler 1 and the second ruler 2 and the plane formed by the third ruler 3 and the fourth ruler 4.

[0040] Specifically, in step 2, the fitting gap between the first ruler 1 and the first straight pipe segment is adjusted, so that the first ruler 1 tightly abuts against the side wall of the first straight pipe segment; the fitting gap between the second ruler 2 and the second straight pipe segment is adjusted, so that the second ruler 2 tightly abuts against the side wall of the second straight pipe segment; the fitting gap between the third ruler 3 and the second straight pipe segment is adjusted, so that the third ruler 3 tightly abuts against the side wall of the second straight pipe segment; and the fitting gap between the fourth ruler 4 and the third straight pipe segment is adjusted, so that the fourth ruler 4 tightly abuts against the side wall of the third straight pipe segment.

[0041] For the connection mode between the guide circular arc plate 6 and the sliding circular arc plate 7, the ruler body of the guide circular arc plate 6 is processed into a semicircular arc shape, and a ring-shaped hole 9 is formed on the guide circular arc plate 6 along the circumferential direction of the guide circular arc plate 6. The ring-shaped hole 9 basically covers the entire angle range of the guide circular arc plate 6, and only a certain limiting width is reserved at both ends.

[0042] For the structure of the sliding arc plate, it comprises an arc guide block 71, a first arc plate body 72, a second arc plate body 73, and a locking screw 74 and a locking nut matched with each other. The arc guide block 71 is located in the annular hole 9 of the guide arc plate 6, the first arc plate body 72 is located at one side of the guide arc plate 6, the second arc plate body 73 is located at the other side of the guide arc plate 6, and the locking screw 74 is connected with the locking nut after passing through the first arc plate body 72, the arc guide block 71 and the second arc plate body 73 in sequence. When the locking screw 74 is not tightened, the distance between the first arc plate body 72 and the second arc plate body 73 is far, and the relative sliding between the first arc plate body 72 and the second arc plate body 73 and the guide arc plate 6 will not interfere with each other, and the arc guide block 71 can slide in the annular hole 9. When the locking screw 74 is tightened, the distance between the first arc plate body 72 and the second arc plate body 73 is reduced, and the friction between the first arc plate body 72, the second arc plate body 73 and the guide arc plate 6 is increased, so that the relative fixation of the first arc plate body 72, the second arc plate body 73, the arc guide block 71 and the guide arc plate 6 can be realized.

[0043] In order to reduce the shaking of the first arc plate body 72, the second arc plate body 73, the arc guide block 71 and the guide arc plate 6 when they are relatively fixed, the radial width of the arc guide block 71 is equal to the radial width of the annular hole 9, the inner diameter and the outer diameter of the first arc plate body 72 and the second arc plate body 73 are equal to the inner diameter and the outer diameter of the guide arc plate 6, and the matching gap tolerance between the above-mentioned components is not more than 0.01 mm, so as to ensure that the assembly is not shaken left and right and can slide freely.

[0044] It is worth noting that the contact between the second straight ruler 2 and the third straight ruler 3 and the curved guide pipe 5 is a line contact, and the contact stability is poor. Therefore, the above-mentioned measuring ruler further comprises a support 8, the support end of the support 8 is located at the center of the guide arc plate 6 and the sliding arc plate 7, the second straight pipe section is supported on the support end of the support 8, so that the second straight pipe section is perpendicular to the radial direction of the guide arc plate 6 and the sliding arc plate 7, and the center of the guide arc plate 6 and the sliding arc plate 7 passes through the axis of the second straight pipe section, and the connecting end of the support 8 is fixedly connected with the guide arc plate 6.

[0045] Exemplarily, the support 8 comprises a first gripper 81, a second gripper 82, a gripper guide block 83, and a gripper screw 84 and a gripper nut matched with each other. The first gripper 81 and the second gripper 82 are of the same structure, which is a fan-shaped structure. The support end of the first gripper 81 and the support end of the second gripper 82 are circular arc-shaped. The second straight pipe section is supported on the inner arc surface of the support end of the first gripper 81 and the support end of the second gripper 82. The gripper guide block 83 is located in the annular hole 9. The connecting end of the first gripper 81 is located on one side of the guide circular arc plate 6. The connecting end of the second gripper 82 is located on the other side of the guide circular arc plate 6. The gripper guide block 83 is located between the connecting end of the first gripper 81 and the connecting end of the second gripper 82. The gripper screw 84 passes through the connecting end of the first gripper 81, the gripper guide block 83, and the connecting end of the second gripper 82 and is connected with the gripper nut. When the gripper screw 84 is not tightened, the distance between the first gripper 81 and the second gripper 82 is far, and interference does not occur between the relative sliding of the first gripper 81 and the second gripper 82 and the guide circular arc plate 6. The gripper guide block 83 can slide in the annular hole 9. When the gripper screw 84 is tightened, the distance between the first gripper 81 and the second gripper 82 is reduced, and the friction between the first gripper 81, the second gripper 82, and the guide circular arc plate 6 is increased, so that the relative fixation of the first gripper 81, the second gripper 82, the gripper guide block, and the guide circular arc plate 6 can be achieved.

[0046] In order to reduce the shaking of the relative fixation of the first gripper 81, the second gripper 82, the gripper guide block 83, and the guide circular arc plate 6, the radial width of the above-mentioned gripper guide block 83 is equal to the radial width of the annular hole 9. The outer diameter of the first gripper 81 and the second gripper 82 is equal to the outer diameter of the guide circular arc plate 6. The matching gap tolerance between the above-mentioned several components is not more than 0.01 mm, so as to ensure that the assembly cooperation does not shake left and right and can freely slide.

[0047] Exemplarily, the radius of the inner arc surface of the support end of the first gripper 81 and the second gripper 82 is 6 mm to 10 mm, which can be suitable for a larger range of outer diameters of the curved guide pipe 5.

[0048] In addition, in order to improve the connection stability between the curved guide pipe 5 and the first ruler 1, the second ruler 2, the third ruler 3, and / or the fourth ruler 4, the following method can also be used. The above-mentioned measuring ruler further comprises a U-shaped clamp 10. The guide pipe is fixedly connected with the first ruler 1 through the U-shaped clamp 10, and / or the guide pipe is connected with the second ruler 2 through the U-shaped clamp 10, and / or the guide pipe is connected with the third ruler 3 through the U-shaped clamp 10, and / or the guide pipe is connected with the fourth ruler 4 through the U-shaped clamp 10.

[0049] Specifically, the first ruler 1, the second ruler 2, the third ruler 3 and the fourth ruler 4 have the same structure, which comprises a ruler body, a blind hole is formed on the ruler body, a through hole 12 is formed at the bottom of the blind hole, so that a stepped inner wall can be formed on the ruler body. The two ends of the ruler body are semicircular, the radius of the semicircle is half of the width of the ruler body, and the shapes of the two ends of the blind hole and the two ends of the through hole 12 can be semicircular or square.

[0050] In order to realize the connection between the first ruler 1 and the second ruler 2, the measuring ruler further comprises a first fixing piece 13, a first fixing screw 14 and a first fixing nut matched with each other, the first fixing screw passes through the first fixing piece 13, the first ruler 1 and the second ruler 2 and is detachably fixedly connected with the first fixing nut. In order to reduce the shaking between the first ruler 1 and the second ruler 2, the first fixing piece 13 is located in the blind hole of the first ruler 1 and / or the first fixing piece 13 is located in the blind hole 11 of the second ruler 2, the first fixing piece 13 is matched with the blind hole of the first ruler 1 and / or the blind hole 11 of the second ruler 2, so that the angle of the first ruler 1 and the second ruler 2 is stable after the first fixing screw is tightened, and the first ruler 1 and the second ruler 2 will not be easily deformed.

[0051] In order to realize the connection between the third ruler 3 and the fourth ruler 4, the measuring ruler further comprises a second fixing piece, a second fixing screw and a second fixing nut matched with each other, the second fixing screw passes through the second fixing piece, the third ruler 3 and the fourth ruler 4 and is detachably fixedly connected with the second fixing nut. In order to reduce the shaking between the third ruler 3 and the fourth ruler 4, the second fixing piece is located in the blind hole of the third ruler 3 and / or the second fixing piece is located in the blind hole of the fourth ruler 4, and the second fixing piece is matched with the blind hole of the third ruler 3 and / or the blind hole of the fourth ruler 4.

[0052] Exemplarily, one end of the first ruler plate 15 is connected with the second ruler 2 through a first end fixing block 16, a first end screw 17 passes through the first ruler plate 15, the second ruler 2 and the first end fixing block 16 and is fixedly connected with a first end nut, so as to realize the connection between the first ruler plate 15 and the second ruler 2, and make the second ruler 2 tightly adhere to the side surface of the first ruler plate 15.

[0053] Similarly, the other end of the first ruler plate 15 is connected with the guide circular arc plate 6 through a second end fixing block 18, the second end fixing block 18 is fixedly connected with the guide circular arc plate 6 (for example, welded or integrally formed), and a second end screw 19 passes through the first ruler plate 15 and the second end fixing block 18 and is fixedly connected with a second end nut, so as to realize the connection between the first ruler plate 15 and the guide circular arc plate 6.

[0054] Exemplarily, one end of the second ruler plate 20 is connected with the third ruler 3 through the third end fixing block 21, and the third end screw 22 is fixedly connected with the third end nut after penetrating through the second ruler plate 20, the third ruler 3 and the third end fixing block 21, so as to realize the connection between the second ruler plate 20 and the third ruler 3, and make the third ruler 3 closely adhere to the side surface of the second ruler plate 20.

[0055] Likewise, the other end of the second ruler plate 20 is connected with the sliding arc plate 7 through the fourth end fixing block 23, the fourth end fixing block 23 is fixedly connected with the sliding arc plate 7 (for example, welded or integrally formed), and the fourth end screw 24 is fixedly connected with the fourth end nut after penetrating through the second ruler plate 20 and the fourth end fixing block 23, so as to realize the connection between the second ruler plate 20 and the sliding arc plate 7.

[0056] In order to improve the adaptability of the above-mentioned measuring ruler, so as to be able to measure the catheter with different diameters, a plurality of first mounting holes for detachable connection with the second end fixing block 18 are arranged on the first ruler plate 15 along the length direction, and a plurality of second mounting holes for detachable connection with the fourth end fixing block 23 are arranged on the second ruler plate 20 along the length direction. In this way, by changing the connection between the second end fixing block 18 and different first mounting holes, and changing the fixed connection between the fourth end fixing block 23 and different mounting holes, the length of the first ruler plate 15 and the second ruler plate 20 can be changed, and then the distance between the second ruler 2 and the third ruler 3 is changed, so as to adapt to the measurement of the curved catheter 5 with different diameters.

[0057] From the perspective of spatial layout, catheter length and measurement interference, the structures of the second end fixing block 18 and the fourth end fixing block 23 are the same, both of which include a block body and a first mounting block and a second mounting block symmetrically arranged with respect to the arc plane of the guide arc plate 6, mounting holes are arranged on the first mounting block and the second mounting block, the first mounting block of the second end fixing block 18 and the first mounting block of the fourth end fixing block 23 are located on the same side of the arc plane, and the second mounting block of the second end fixing block 18 and the second mounting block of the fourth end fixing block 23 are located on the other side of the arc plane.

[0058] In order to ensure the stability of the connection between the first ruler plate 15 and the second end fixing block 18 and the stability of the connection between the second ruler plate 20 and the fourth end fixing block 23, the second end fixing block 18 and the fourth end fixing block 23 are arranged along the tangent direction of the guide arc plate 6, so that the first ruler plate 15 and the second ruler plate 20 are arranged along the radial direction of the guide arc plate 6, that is, the first ruler plate 15 and the second ruler plate 20 are perpendicular to the tangent plane of the guide arc plate 6.

[0059] In one aspect, from the perspective of spatial layout and the length of the pipe, the first scale plate 15 is connected to the first mounting block of the second end fixed block 18, and the second scale plate 20 is connected to the first mounting block of the fourth end fixed block 23, or the first scale plate 15 is connected to the second mounting block of the second end fixed block 18, and the second scale plate 20 is connected to the second mounting block of the fourth end fixed block 23, that is, the first scale plate 15 and the second scale plate 20 are located on the same side, which can reduce the overall volume of the measuring scale, and can also reduce the transverse distance between the first scale plate 15 and the second scale plate 20, and adapt to the case that the length of the pipe is small.

[0060] In another aspect, from the perspective of measurement interference, the first scale plate 15 is connected to the first mounting block of the second end fixed block 18, and the second scale plate 20 is connected to the second mounting block of the fourth end fixed block 23, or the first scale plate 15 is connected to the second mounting block of the second end fixed block 18, and the second scale plate 20 is connected to the first mounting block of the fourth end fixed block 23, that is, the first scale plate 15 and the second scale plate 20 are located on different sides, so that the first scale plate 15 and the second scale plate 20 can coincide in the transverse plane and do not interfere, thereby being applicable to the measurement of the case that the parameter B is zero.

[0061] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method of measuring a bending angle of a bending catheter, characterized by, The method comprises the following steps: Step 1: providing a curved pipe and a measuring scale, the measuring scale comprising a first ruler, a second ruler, a third ruler, a fourth ruler, a first connecting plate, a second connecting plate, a guide arc plate and a sliding arc plate, the guide arc plate and the sliding arc plate being concentrically arranged, being slidingly connected and having a fixed relative position, the first connecting plate and the second connecting plate being arranged along the radial direction of the guide arc plate, the second ruler being fixedly connected with the guide arc plate through the first connecting plate, the third ruler being fixedly connected with the sliding arc plate through the second connecting plate, the first ruler being rotationally connected with the second ruler and having a fixed relative position, and the third ruler being rotationally connected with the fourth ruler and having a fixed relative position; Step 2: positioning the first ruler, the first ruler, the third ruler and the fourth ruler so that the first ruler is arranged along the axial direction of the first straight pipe section and located in the same plane, the second ruler is arranged along the axial direction of the second straight pipe section and located in the same plane, the third ruler is arranged along the axial direction of the second straight pipe section and located in the same plane, and the fourth ruler is arranged along the axial direction of the third straight pipe section and located in the same plane; Step 3: measuring the angle between the guide arc plate and the sliding arc plate to obtain the included angle between the plane formed by the first ruler and the second ruler and the plane formed by the third ruler and the fourth ruler, which is the bending angle of the curved pipe.

2. The method of claim 1, wherein, In step 2, the fitting gap between the first ruler and the first straight pipe section is adjusted so that the first ruler tightly abuts against the side wall of the first straight pipe section.

3. The method of claim 1, wherein, In step 2, the fitting gap between the second ruler and the second straight pipe section is adjusted so that the second ruler tightly abuts against the side wall of the second straight pipe section.

4. The method of claim 1, wherein, In step 2, the fitting gap between the third ruler and the second straight pipe section is adjusted so that the third ruler tightly abuts against the side wall of the second straight pipe section.

5. The method of claim 1, wherein, In step 2, the fitting gap between the fourth ruler and the third straight pipe section is adjusted so that the fourth ruler tightly abuts against the side wall of the third straight pipe section.

6. The method of claim 1, wherein The annular hole is formed on the guide arc plate along the circumferential direction of the guide arc plate; The sliding arc plate comprises an arc guide block, a first arc plate body, a second arc plate body, and a locking screw and a locking nut in cooperation with each other, the arc guide block is located in the annular hole of the guide arc plate, the first arc plate body is located on one side of the guide arc plate, the second arc plate body is located on the other side of the guide arc plate, the arc guide block is located between the first arc plate body and the second arc plate body, and the locking screw is connected with the locking nut after passing through the first arc plate body, the arc guide block and the second arc plate body.

7. The method of claim 6, wherein, The fitting gap tolerance between the first arc plate body, the second arc plate body, the arc guide block and the guide arc plate is not more than 0.01 mm.

8. The method of claim 1, wherein, The measuring scale further comprises a support, which comprises a first claw, a second claw, a claw guide block, and a claw screw and a claw nut matched with each other, the claw guide block is located in the annular hole, the connecting end of the first claw is located on one side of the guide circular arc plate, the connecting end of the second claw is located on the other side of the guide circular arc plate, the claw guide block is located between the connecting end of the first claw and the connecting end of the second claw, and the claw screw is connected with the claw nut after penetrating through the connecting end of the first claw, the claw guide block and the connecting end of the second claw.

9. The method of claim 8, wherein, The cooperation gap tolerance between the first claw, the second claw, the claw guide block and the guide circular arc plate is not more than 0.01 mm.

10. The method of claim 8, wherein, The radius of the inner arc surface of the support end of the first claw and the second claw is 6 mm to 10 mm.

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