Bent conduit precision measuring scale

Abstract

The application discloses a precise measuring scale for a bent pipe, belongs to the technical field of YBC coordinate design measurement and numerical control bending forming of a pipe, and solves the problems of long trial and error period, complex process, complex structure of an existing YBC scale, and high cost in the prior art. In the scale, a guide circular arc plate and a sliding circular arc plate are concentrically arranged, first and second connecting scale plates are arranged along the radial direction of the guide circular arc plate, a second straight scale is fixedly connected with the guide circular arc plate through the first connecting scale plate, and a third straight scale is fixedly connected with the sliding circular arc plate through the second connecting scale plate. The first straight scale is rotationally connected with the second straight scale, the first straight scale is arranged along the axial direction of a first straight pipe section, and the second straight scale is arranged along the axial direction of a second straight pipe section. The third straight scale is rotationally connected with a fourth straight scale, the third straight scale is arranged along the axial direction of the second straight pipe section, and the fourth straight scale is arranged along the axial direction of a third straight pipe section. The application can be used for YBC parameter measurement of a bent pipe.

Description

Technical Field

[0001] This invention belongs to the field of YBC coordinate design and measurement and CNC bending forming technology of conduits, and particularly relates to a precision measuring ruler for bending conduits. Background Technology

[0002] Currently, in the field of conduit measurement and bending forming, trial assembly fixtures are generally used for quality control of the two end positions. However, in conduit bending manufacturing, the measurement and feedback of deviation values ​​determine the number of bending adjustments and the final product accuracy. The measurement method and the accuracy of the measuring tools have a significant impact on the deviation values. Moreover, after the product is assembled and the conduit installation conditions are met, conduit sampling can be carried out to finally determine the conduit's qualification. Therefore, the typical conduit manufacturing process, including bending manufacturing, final assembly, conduit sampling and adjustment, re-bending and re-adjustment, etc., requires a large period of trial and error, waiting, coordination, and repeated iterations.

[0003] The use of trial assembly fixtures is a common method for controlling the processing quality of parts. However, trial assembly fixtures do not include dimensional inspection and data feedback functions for conduit products, and their production cycle is long and the cost is high. In aerospace products, the precision requirements for conduits are extremely stringent. The bending angle, the length of the straight section, and the angle of the pipe rotation surface affect the clearance requirements between the two end pipe positions, the intermediate fixed position, and the cabin wall. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a precise measuring ruler for curved catheters, which solves the problems of long trial-and-error cycles and complex processes in catheter measurement in the prior art.

[0005] The objective of this invention is mainly achieved through the following technical solutions:

[0006] This invention provides a precise measuring ruler for curved conduits, comprising a first ruler, a second ruler, a third ruler, a fourth ruler, and an adapter unit. The adapter unit includes 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 are concentrically arranged, slidably connected, and their relative positions can be fixed. The first and second connecting plates are both arranged radially along the guide arc plate. The second ruler is fixedly connected to the guide arc plate via the first connecting plate, and the third ruler is fixedly connected to the sliding arc plate via the second connecting plate. The first ruler and the second ruler are rotatably connected and their relative positions can be fixed. The first ruler is arranged axially along the first straight pipe segment, and the second ruler is arranged axially along the second straight pipe segment with its side surface in contact with the second straight pipe segment. The third ruler and the fourth ruler are rotatably connected and their relative positions can be fixed. The third ruler is arranged axially along the second straight pipe segment, and the fourth ruler is arranged axially along the third straight pipe segment.

[0007] Furthermore, an annular hole is provided on the guide arc plate along the circumference of the guide arc plate.

[0008] Furthermore, the sliding arc plate includes an arc guide block, a first arc plate body, a second arc plate body, and a locking screw and a locking nut that cooperate 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 passes through the first arc plate body, the arc guide block, and the second arc plate body and is connected to the locking nut.

[0009] Furthermore, the radial width of the arc guide block is equal to the radial width of the annular hole.

[0010] Furthermore, the first and second arc plates are equal to the inner and outer diameters of the guide arc plate, respectively.

[0011] Furthermore, the precision measuring ruler for the curved conduit also includes a support member. The support end of the support member is located at the center of the guide arc plate and the sliding arc plate. The second straight pipe section is supported on the support end of the support member, so that the second straight pipe section is perpendicular to the radial direction of the guide arc plate. The center of the guide arc plate passes through the axis of the second straight pipe section. The connecting end of the support member is fixedly connected to the guide arc plate.

[0012] Furthermore, the support 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 an annular hole. The connecting end of the first gripper is located on one side of the guide arc plate, and the connecting end of the second gripper is located on the other side of the guide arc plate. The gripper guide block is located between the connecting ends of the first gripper and the second gripper. 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 then connects with the gripper nut.

[0013] Furthermore, both the first and second grippers are fan-shaped structures.

[0014] Furthermore, the supporting ends of the first and second grippers are arc-shaped, and the second straight pipe section is supported on the inner arc surface of the supporting ends of the first and second grippers.

[0015] Furthermore, the radial width of the gripper guide block is equal to the radial width of the annular hole.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] The precision measuring ruler for bent conduits provided by this invention can replace the existing bending manufacturing inspection fixtures. In situations where space and conditions are limited, such as when three-dimensional measurement and scanning technology is not available, it can accurately measure YBC parameters. It can reduce the difficulty and workload of bending manufacturing, measurement, feedback, and revision procedures, reduce repeated sampling work caused by subjective judgment, and greatly accelerate the optimization of conduit routing and production speed, which helps to ensure production progress. It has the characteristics of simple operation, easy implementation, low cost, convenient and fast use, and accurate measurement.

[0018] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. Attached image description:

[0021] Figure 1a This is a schematic diagram of the structure of the precision measuring ruler for curved conduits provided in Embodiment 1 of the present invention;

[0022] Figure 1b This is a schematic diagram of the curved conduit precision measuring ruler provided in Embodiment 1 of the present invention from another direction.

[0023] Figure 2a This is a schematic diagram of the structure of the second ruler in the precision measuring ruler for curved conduits provided in Embodiment 1 of the present invention;

[0024] Figure 2b This is a schematic diagram of the assembly of the first and second rulers in the precision measuring ruler for curved conduits provided in Embodiment 1 of the present invention;

[0025] Figure 3a This is a partial schematic diagram of the precision measuring ruler for curved conduits provided in Embodiment 1 of the present invention;

[0026] Figure 3b This is a partial schematic diagram from another direction of the precision measuring ruler for curved conduits provided in Embodiment 1 of the present invention;

[0027] Figure 4 This is a schematic diagram of the actual measured length position in the precision measuring ruler for curved conduits provided in Embodiment 1 of the present invention;

[0028] Figure 5 This is a schematic diagram showing the actual length position of parameter Y in the precision measuring ruler for the curved conduit provided in Embodiment 1 of the present invention.

[0029] Figure label:

[0030] 1-First ruler; 2-Second ruler; 3-Third ruler; 4-Fourth ruler; 5-Bent guide tube; 6-Guide arc plate; 7-Sliding arc plate; 71-Arc guide block; 72-First arc plate body; 73-Second arc plate body; 74-Locking screw; 8-Supporting component; 81-First gripper; 82-Second gripper; 83-Grip guide block; 84-Grip screw; 9-Annular hole; 10-U-shaped clamp; 11-Blind hole; 12-Through hole; 13-First fixing component; 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 Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of the present invention and, together with the embodiments of the present invention, serve to illustrate the principles of the present invention.

[0032] Example 1

[0033] This embodiment provides a precise measuring ruler for curved conduits. See [link / reference] Figures 1a to 3b The YBC parameter of the curved conduit 5 is used to measure the YBC parameter of the curved conduit 5. The curved conduit 5 includes a first straight pipe section, a first curved pipe section, a second straight pipe section, a second curved pipe section and a third straight pipe section connected in sequence. The precision measuring ruler of the curved conduit includes a first ruler 1, a second ruler 2, a third ruler 3, a fourth ruler 4 and an adapter unit.

[0034] The connecting unit includes a first connecting plate 15, a second connecting plate 20, a guide arc plate 6, and a sliding arc plate 7. The guide arc plate 6 and the sliding arc plate 7 are concentrically arranged, slidably connected, and their relative positions can be fixed. The first connecting plate 15 and the second connecting plate 20 are both arranged radially along the guide arc plate 6 and the sliding arc plate 7. The second ruler 2 is fixedly connected to the guide arc plate 6 through the first connecting plate 15, and the third ruler 3 is fixedly connected to the sliding arc plate 7 through the second connecting plate 20. The angle between the guide arc plate 6 and the sliding arc plate 7 can be used to obtain the angle (i.e., parameter B, bending 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.

[0035] The first ruler 1 and the second ruler 2 are rotatably connected and their relative positions can be fixed. The first ruler 1 is set along the axial direction of the first straight pipe section and its side is in contact with the first straight pipe section. The second ruler 2 is set along the axial direction of the second straight pipe section and its side is in contact with the second straight pipe section. By measuring the angle between the first ruler 1 and the second ruler 2, the bending angle (i.e., parameter C1) of the first straight pipe section and the second straight pipe section can be obtained.

[0036] The third ruler 3 and the fourth ruler 4 are rotatably connected and their relative positions can be fixed. The third ruler 3 is set along the axial direction of the second straight pipe section and its side is in contact with the side of the second straight pipe section. The fourth ruler 4 is set along the axial direction of the third straight pipe section and its side is in contact with the side of the third straight pipe section. By measuring the angle between the third ruler 3 and the fourth ruler 4, the bending angle (i.e., parameter C2) of the second and third straight pipe sections can be obtained.

[0037] The measurement method includes the following steps:

[0038] Step 1: Provide a catheter;

[0039] Step 2: Perform preliminary positioning of the first ruler 1 and the first straight pipe section, perform preliminary positioning of the second ruler 2 and the second straight pipe section, perform preliminary positioning of the third ruler 3 and the second straight pipe section, and perform preliminary positioning of the fourth ruler 4 and the third straight pipe section.

[0040] Step 3: Adjust the fitting gap between the first ruler 1 and the first straight pipe section so that the first ruler 1 is arranged along the axial direction of the first straight pipe section and is located in the same plane.

[0041] Adjust the fitting gap between the second ruler 2 and the second straight pipe section so that the second ruler 2 is arranged along the axial direction of the second straight pipe section and is located in the same plane;

[0042] Adjust the fitting gap between the third ruler 3 and the second straight pipe section so that the third ruler 3 is arranged along the axial direction of the second straight pipe section and is located in the same plane;

[0043] Adjust the fit gap between the fourth ruler 4 and the third straight pipe section so that the fourth ruler 4 is arranged along the axial direction of the third straight pipe section and is located in the same plane.

[0044] Step 4: Measure the angle between the first ruler 1 and the second ruler 2 to obtain the bending angle (i.e., parameter C1) between the first and second straight pipe sections.

[0045] Measuring the angle between the third ruler 3 and the fourth ruler 4 allows us to obtain the bending angle (i.e., parameter C2) between the second and third straight pipe sections.

[0046] By measuring the angle between the guide arc plate 6 and the sliding arc plate 7, 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.

[0047] Measure the perpendicular distance L1 between the end of the first straight pipe segment furthest from the first bend and the intersection of the first ruler 1 and the second ruler 2, and calculate the length Y1 of the first straight pipe segment. Measure the perpendicular distance L2 between the intersection of the first ruler 1 and the second ruler 2 and the intersection of the third ruler 3 and the fourth ruler 4, and calculate the length Y2 of the second straight pipe segment. Measure the perpendicular distance L3 between the intersection of the third ruler 3 and the fourth ruler 4 and the end of the third straight pipe segment furthest from the second bend, and calculate the length Y3 of the third straight pipe segment. See [reference needed] Figures 4 to 5 .

[0048] Specifically, the length Y1 of the first straight pipe segment is calculated using the following formula:

[0049] Y1 = L1 - ΔL1;

[0050] ΔL1=R1tan(0.5C1);

[0051] Where Y1 is the length of the first straight pipe section, mm; L1 is the vertical distance of the first straight pipe section away from the end of the first bend pipe section and the intersection of the first straight ruler 1 and the second straight ruler 2, mm; R1 is the outer arc radius of the first bend pipe section, mm; C1 is the arc angle of the outer arc of the first bend pipe section, °.

[0052] The length Y2 of the second straight pipe section is calculated using the following formula:

[0053] Y2=L2-ΔL1-ΔL2

[0054] ΔL1=R1tan(0.5C1);

[0055] ΔL2=R2tan(0.5C2);

[0056] Where Y2 is the length of the second straight pipe section, mm; L2 is the perpendicular distance between the intersection of the first ruler 1 and the second ruler 2 and the intersection of the third ruler 3 and the fourth ruler 4, mm; R1 is the outer arc radius of the first bend pipe section, mm; C1 is the arc angle of the outer arc of the first bend pipe section, °; ​​R2 is the outer arc radius of the second bend pipe section, mm; C2 is the arc angle of the outer arc of the second bend pipe section, °.

[0057] The length Y3 of the third straight pipe section is calculated using the following formula:

[0058] Y3 = L3 - ΔL2;

[0059] ΔL2=R2tan(0.5C2)

[0060] Where Y2 is the length of the third straight pipe section, mm; L2 is the perpendicular distance between the intersection of the third straight ruler 3 and the fourth straight ruler 4 and the end of the third straight pipe section away from the second bend, mm; R2 is the outer arc radius of the second bend, mm; and C2 is the arc angle of the outer arc of the second bend, °.

[0061] It should be noted that in practical applications, R1 = R2.

[0062] Compared with existing technologies, the precision measuring ruler for bent conduits provided in this embodiment can replace the current bending manufacturing inspection fixtures. In situations where space and conditions are limited, such as when three-dimensional measurement and scanning technology is not available, it can accurately measure YBC parameters. This reduces the difficulty and workload of bending manufacturing, measurement, feedback, and revision procedures, reduces repeated sampling work caused by subjective judgment, and greatly accelerates the optimization of conduit routing and production speed. It helps to ensure production progress and has the characteristics of simple operation, easy implementation, low cost, convenient and fast use, and accurate measurement.

[0063] It should be noted that, on the one hand, parameter Y refers to the lengths of the first, second, and third straight pipe sections, which can be measured using conventional length measuring tools, such as rulers. Alternatively, graduations can be set on the first ruler 1, the second ruler 2, the third ruler 3, and / or the fourth ruler 4 for direct measurement of the lengths of the first, second, and third straight pipe sections.

[0064] On the other hand, the actual angles of parameters C1 and C2 can be measured using a conventional angle ruler, electronic angle measuring instrument, or vernier angle measuring tool, which will not be detailed here.

[0065] On the other hand, the actual angle of parameter B can be measured using a conventional angle ruler, electronic angle measuring instrument, or vernier angle measuring tool. Alternatively, scale lines or angle vernier dimension lines can be set on the guide arc plate 6 to directly measure the 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.

[0066] For the connection between the guide arc plate 6 and the sliding arc plate 7, for example, the guide arc plate 6 is made of sheet metal processed into a semi-circular arc shape, and an annular hole 9 is opened on the guide arc plate 6 along the circumference of the guide arc plate 6. The annular hole 9 basically covers the entire angle range of the guide arc plate 6, and only a certain limiting width is reserved at both ends.

[0067] The structure of the sliding arc plate includes 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 that cooperate 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 on one side of the guide arc plate 6, and the second arc plate body 73 is located on the other side of the guide arc plate 6. The locking screw 74 passes through the first arc plate body 72, the arc guide block 71, and the second arc plate body 73 in sequence and then connects with the locking nut. When the locking screw 74 is not tightened, the distance between the first arc plate 72 and the second arc plate 73 is relatively large, and there will be no interference with the relative sliding between them and the guide arc plate 6. 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 72 and the second arc plate 73 decreases, and the friction between the first arc plate 72 and the second arc plate 73 and the guide arc plate 6 increases, thereby achieving relative fixation of the first arc plate 72, the second arc plate 73, the arc guide block 71, and the guide arc plate 6.

[0068] In order to reduce the shaking when the first arc plate 72, the second arc plate 73, the arc guide block 71 and the guide arc plate 6 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 outer diameter of the first arc plate 72 and the second arc plate 73 are equal to those of the guide arc plate 6, and the fit clearance tolerance between the above components does not exceed 0.01mm, so as to ensure that the assembly fit does not wobble from side to side and can slide freely.

[0069] It is worth noting that the contact between the second ruler 2 and the third ruler 3 and the curved conduit 5 is a line contact, which has poor contact stability. Therefore, the above-mentioned curved conduit precision measuring ruler also includes a support member 8. The support end of the support member 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 member 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. The connecting end of the support member 8 is fixedly connected to the guide arc plate 6.

[0070] For example, the support member 8 includes a first gripper 81, a second gripper 82, a gripper guide block 83, and a gripper screw 84 and a gripper nut that cooperate with each other. The first gripper 81 and the second gripper 82 have the same structure and are fan-shaped. The support ends of the first gripper 81 and the second gripper 82 are arc-shaped. The second straight pipe section is supported on the inner arc surface of the support ends of the first gripper 81 and 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 arc plate 6, and the connecting end of the second gripper 82 is located on the other side of the guide arc plate 6. The gripper guide block 83 is located between the connecting ends of the first gripper 81 and the second gripper 82. The gripper screw 84 passes through the connecting end of the first gripper 81, the connecting end of the gripper guide block 83 and the second gripper 82 and is connected to the gripper nut. When the gripper screw 84 is not tightened, the distance between the first gripper 81 and the second gripper 82 is relatively large, and there will be no interference with the relative sliding between them and the guide 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 decreases, and the friction between the first gripper 81 and the second gripper 82 and the guide arc plate 6 increases, thereby achieving relative fixation of the first gripper 81, the second gripper 82, the brush guide block, and the guide arc plate 6.

[0071] In order to reduce the shaking when the first gripper 81, the second gripper 82, the gripper guide block 83 and the guide arc plate 6 are relatively fixed, the radial width of the 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 arc plate 6, and the fit clearance tolerance between the above-mentioned components does not exceed 0.01mm, so as to ensure that the assembly fit does not wobble from side to side and can slide freely.

[0072] For example, the radius of the inner arc surface of the support end of the first gripper 81 and the second gripper 82 is 6mm to 10mm, which can accommodate a large range of curved outer diameters of the conduit 5.

[0073] Furthermore, to improve the connection stability between the curved conduit 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 adopted: the above-mentioned curved conduit precision measuring ruler also includes a U-shaped clamp 10, the conduit is fixedly connected to the first ruler 1 through the U-shaped clamp 10, and / or, the conduit is connected to the second ruler 2 through the U-shaped clamp 10, and / or, the conduit is connected to the third ruler 3 through the U-shaped clamp 10, and / or, the conduit is connected to the fourth ruler 4 through the U-shaped clamp 10.

[0074] Specifically, the structures of the first ruler 1, the second ruler 2, the third ruler 3, and the fourth ruler 4 are basically the same, including a ruler body with blind holes and through holes 12 at the bottom of the blind holes, thus forming a stepped inner wall on the ruler body. The two ends of the ruler body are semicircular, with a radius of half the width of the ruler body. The shapes of the two ends of the blind holes and the two ends of the through holes 12 can be either semicircular or square.

[0075] In order to achieve the connection between the first ruler 1 and the second ruler 2, the above-mentioned curved guide tube precision measuring ruler also includes a first fixing member 13 and a first fixing screw 14 and a first fixing nut that cooperate with each other. The first fixing screw passes through the first fixing member 13, the first ruler 1 and the second ruler 2 and is detachably fixed to the first fixing nut. In order to reduce the shaking between the first ruler 1 and the second ruler 2, the first fixing member 13 is located in the blind hole of the first ruler 1 and / or the first fixing member 13 is located in the blind hole 11 of the second ruler 2. The first fixing member 13 cooperates with the blind hole of the first ruler 1 and / or the blind hole 11 of the second ruler 2 to ensure that the angle of the first ruler 1 and the second ruler 2 is stable after the first fixing screw is tightened and will not be easily deformed.

[0076] In order to achieve the precise measuring ruler between the third ruler 3 and the fourth ruler 4, the aforementioned curved guide tube also includes a second fixing member and a second fixing screw and a second fixing nut that cooperate with each other. The second fixing screw passes through the second fixing member, the third ruler 3 and the fourth ruler 4 and is detachably fixed to the second fixing nut. In order to reduce the shaking between the third ruler 3 and the fourth ruler 4, the second fixing member is located in the blind hole of the third ruler 3 and / or the second fixing member is located in the blind hole of the fourth ruler 4. The second fixing member cooperates with the blind hole of the third ruler 3 and / or the blind hole of the fourth ruler 4.

[0077] It should be noted that there is one first fastener 13, which can be located in one of the blind holes of the first ruler 1 and the blind holes 11 of the second ruler 2, or there can be two first fasteners 13, one of which is located in the blind hole of the first ruler 1 and the other in the blind hole 11 of the second ruler 2.

[0078] Similarly, the second fastener is one, which can be located in one of the blind holes of the third ruler 3 and the fourth ruler 4, or the number of the second fastener is two, one in the blind hole of the third ruler 3 and the other in the blind hole of the fourth ruler 4.

[0079] For example, one end of the first connecting ruler plate 15 is connected to the second ruler 2 through the first end fixing block 16. The first end screw 17 passes through the first connecting ruler plate 15, the second ruler 2 and the first end fixing block 16 and is fixedly connected to the first end nut, thereby realizing the connection between the first connecting ruler plate 15 and the second ruler 2, so that the second ruler 2 is in close contact with the side of the first connecting ruler plate 15.

[0080] Similarly, the other end of the first connecting plate 15 is connected to the guide arc plate 6 through the second end fixing block 18. The second end fixing block 18 is fixedly connected to the guide arc plate 6 (e.g., by welding or integral molding). The second end screw 19 passes through the first connecting plate 15 and the second end fixing block 18 and is fixedly connected to the second end nut, thereby realizing the connection between the first connecting plate 15 and the guide arc plate 6.

[0081] For example, one end of the second connecting plate 20 is connected to the third ruler 3 through the third end fixing block 21. The third end screw 22 passes through the second connecting plate 20, the third ruler 3 and the third end fixing block 21 and is fixedly connected to the third end nut, thereby realizing the connection between the second connecting plate 20 and the third ruler 3, so that the third ruler 3 is in close contact with the side of the second connecting plate 20.

[0082] Similarly, the other end of the second connecting plate 20 is connected to the sliding arc plate 7 via the fourth end fixing block 23. The fourth end fixing block 23 is fixedly connected to the sliding arc plate 7 (e.g., by welding or integral molding). The fourth end screw 24 passes through the second connecting plate 20 and the fourth end fixing block 23 and is fixedly connected to the fourth end nut, thereby realizing the connection between the second connecting plate 20 and the sliding arc plate 7.

[0083] To improve the adaptability of the aforementioned curved conduit measuring ruler, enabling the measurement of conduits of different diameters, the first connecting plate 15 has multiple first mounting holes arranged along its length for detachable connection with the second end fixing block 18, and the second connecting plate 20 has multiple second mounting holes arranged along its length for detachable connection with the fourth end fixing block 23. Thus, by changing the connection of the second end fixing block 18 to different first mounting holes, and changing the connection of the fourth end fixing block 23 to different mounting holes, the lengths of the first connecting plate 15 and the second connecting plate 20 can be changed, thereby altering the distance between the second ruler 2 and the third ruler 3, adapting to the measurement of curved conduits 5 of different diameters.

[0084] From the perspectives of spatial layout, conduit length, and measurement interference, the structures of the second end fixing block 18 and the fourth end fixing block 23 are the same. Each of them includes a block body and a first mounting block and a second mounting block symmetrically arranged relative to the arc plane of the guide arc plate 6. Mounting holes are opened on both 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.

[0085] In order to ensure the stability of the connection between the first connecting plate 15 and the second end fixing block 18, and the stability of the connection between the second connecting plate 20 and the fourth end fixing block 23, the second end fixing block 18 and the fourth end fixing block 23 are both arranged along the tangent direction of the guide arc plate 6, so that the first connecting plate 15 and the second connecting plate 20 are arranged radially along the guide arc plate 6, that is, the first connecting plate 15 and the second connecting plate 20 are perpendicular to the tangent surface of the guide arc plate 6.

[0086] On the one hand, considering the spatial layout and the length of the conduit, the first connecting plate 15 is connected to the first mounting block of the second end fixing block 18, and the second connecting plate 20 is connected to the first mounting block of the fourth end fixing block 23. Alternatively, the first connecting plate 15 is connected to the second mounting block of the second end fixing block 18, and the second connecting plate 20 is connected to the second mounting block of the fourth end fixing block 23. In other words, the first connecting plate 15 and the second connecting plate 20 are located on the same side. This can reduce the overall volume of the precision measuring ruler for the curved conduit, and at the same time, it can also reduce the lateral distance between the first connecting plate 15 and the second connecting plate 20, which is suitable for situations where the conduit length is small.

[0087] On the other hand, from the perspective of measurement interference, the first connecting plate 15 is connected to the first mounting block of the second end fixing block 18, and the second connecting plate 20 is connected to the second mounting block of the fourth end fixing block 23. Alternatively, the first connecting plate 15 is connected to the second mounting block of the second end fixing block 18, and the second connecting plate 20 is connected to the first mounting block of the fourth end fixing block 23. That is to say, the first connecting plate 15 and the second connecting plate 20 are located on different sides. In this way, the first connecting plate 15 and the second connecting plate 20 can coincide in the transverse plane without interference, thus making it suitable for measurement when parameter B is zero.

[0088] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A precision measuring scale for a curved catheter, comprising: The curved conduit precision measuring ruler comprises a first straight ruler, a second straight ruler, a third straight ruler, a fourth straight ruler and an adapter unit; The adapter unit comprises a first connecting ruler plate, a second connecting ruler plate, a guide circular arc plate and a sliding circular arc plate, the guide circular arc plate and the sliding circular arc plate are concentrically arranged, are in sliding connection and have a fixed relative position, the first connecting ruler plate and the second connecting ruler plate are arranged along the radial direction of the guide circular arc plate, the second straight ruler is fixedly connected with the guide circular arc plate through the first connecting ruler plate, and the third straight ruler is fixedly connected with the sliding circular arc plate through the second connecting ruler plate. The first straight ruler and the second straight ruler are in rotational connection and have a fixed relative position, the first straight ruler is arranged along the axial direction of the first straight pipe segment, and the second straight ruler is arranged along the axial direction of the second straight pipe segment; the third straight ruler and the fourth straight ruler are in rotational connection and have a fixed relative position, the third straight ruler is arranged along the axial direction of the second straight pipe segment, and the fourth straight ruler is arranged along the axial direction of the third straight pipe segment.

2. The curved conduit precision measuring scale of claim 1 wherein, An annular hole is formed in the guide circular arc plate along the circumferential direction of the guide circular arc plate.

3. The curved conduit precision measuring scale of claim 2 wherein, The sliding circular arc plate comprises 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 in cooperation 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 is connected with the locking nut after penetrating through the first circular arc plate body, the circular arc guide block and the second circular arc plate body.

4. The curved catheter precision ruler of claim 3, wherein, The radial width of the circular arc guide block is equal to the radial width of the annular hole.

5. The curved catheter precision ruler of claim 3, wherein, The first circular arc plate body and the second circular arc plate body are equal to the inner diameter and the outer diameter of the guide circular arc plate respectively.

6. The flexible conduit precision measuring scale according to any one of claims 1 to 5, wherein, A support is further arranged, a support end of the support is located at the center of the guide circular arc plate and the sliding circular arc plate, the second straight pipe segment is supported on the support end of the support, so that the second straight pipe segment is perpendicular to the radial direction of the guide circular arc plate, the center of the guide circular arc plate passes through the axis of the second straight pipe segment, and a connecting end of the support is fixedly connected with the guide circular arc plate.

7. The curved catheter precision ruler of claim 6, wherein, The support comprises a first gripper, a second gripper, a gripper guide block and a gripper screw and a gripper nut in cooperation with each other, the gripper guide block is located in the annular hole, a connecting end of the first gripper is located on one side of the guide circular arc plate, a 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 is connected with the gripper nut after penetrating through the connecting end of the first gripper, the gripper guide block and the connecting end of the second gripper.

8. The curved catheter precision ruler of claim 7, wherein, The first gripper and the second gripper are both in the shape of a sector.

9. The curved catheter precision ruler of claim 7, wherein, The support ends of the first gripper and the second gripper are in the shape of an arc, and the second straight pipe segment is supported on the inner arc surface of the support ends of the first gripper and the second gripper.

10. The curved catheter precision ruler of claim 7, wherein, The radial width of the gripper guide block is equal to the radial width of the annular hole.

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