Apparatus and method for testing the torsional resistance of connectors / catheters in combined catheters

Abstract

This invention provides an apparatus and method for testing the torsional resistance of connectors / conduits in composite conduits. The method includes: selecting a torque wrench and conduit clamp appropriate to the specifications of the composite conduit to be tested; installing the composite conduit to be tested in the testing device; drawing a marking line at the rotatable portion of the end to be tested, with the marking line parallel to the axis of the composite conduit; applying torque to the torque wrench to a preset acceptable torque; observing whether the marking line is broken. If the marking line is intact, the composite conduit to be tested is considered acceptable. If the marking line is broken, observe the angle between the end of the broken marking line and the axis of the composite conduit to be tested. If the angle exceeds a preset value, the product is considered unacceptable; if the angle does not exceed the preset value, it is considered acceptable. This invention can ensure the coaxiality of the composite conduit during the measurement process while measuring composite conduits of different specifications.

Description

Technical Field

[0001] This invention relates to the field of pipeline torsion resistance testing technology, and more specifically to a device and method for testing the torsion resistance of joints / conduits in combined conduits. Background Technology

[0002] Piping systems, as a crucial component of hydraulic systems in aircraft, ships, and automobiles, connect hydraulic power sources, control and actuators, acting like "blood vessels" to perform vital functions of media transmission and power delivery. To achieve complex hydraulic control functions within confined spaces, the performance requirements for the combined conduits that form these "blood vessels" are extremely stringent. However, current product specifications and technical standards primarily focus on the tensile strength of combined conduits, rarely mentioning their torsional resistance. In actual operation, piping systems are subjected to both axial tension and torsional stress, especially during the installation of combined conduits where significant installation torque is required. Currently, there are no mature testing methods or standards for the torsional performance of joint conduits. While torsion testing machines can test the torsional resistance of combined conduits, they are expensive, have limited accuracy and range, and cannot cover all specifications of combined conduits. Manual measurement using a vise cannot guarantee coaxiality during testing, and additional bending moments introduced during the test can lead to inflated test results. Summary of the Invention

[0003] In view of the above-mentioned technical problems, an apparatus and method for testing the torsion resistance of connectors / catheters in combined catheters are provided.

[0004] The technical means employed in this invention are as follows:

[0005] A device for testing the torsion resistance of connectors / catheters in combined catheters includes a base on which a vise and a support are fixed side by side.

[0006] The vise includes a main body, and positioning reference surfaces and fixing blocks are respectively provided on both sides of the upper end of the main body. A clamping block is provided between the positioning reference surface and the fixing block. A lead screw passes through the fixing block and is fixedly connected to the clamping block, and the lead screw is threadedly engaged with the fixing block.

[0007] The support base includes two brackets arranged vertically, with the lower bracket fixedly connected to the base. One end of the upper bracket is hinged to one end of the lower bracket, and the other end of the upper bracket is fixedly connected to the other end of the lower bracket by bolts. The upper surface of the lower bracket and the lower surface of the upper bracket each have a semi-circular groove, and the two grooves are joined together to form a complete circle. A guide plate clamp is detachably connected to each of the two grooves. The outer wall of the guide plate clamp is adapted to the groove, and the inner wall is a semi-circular guide groove. The two guide grooves are joined together to form a complete circle, and the inner wall is adapted to the outer wall of the combined guide tube to be tested.

[0008] The end of the combined catheter to be tested is located at the vise, clamped between the clamping block and the positioning reference surface. Part of the catheter is located inside the catheter plate clamp, and the torque application end of the combined catheter to be tested is located outside the catheter plate clamp.

[0009] Preferably, the conduit groove and the recess are concentrically or eccentrically arranged, and different specifications of the combined conduits to be tested are clamped with different specifications of the conduit plate clamps to ensure that the torque application end, the conduit, and the end to be tested are coaxial during the process of being limited by the conduit plate clamps and clamped by the vise.

[0010] Preferably, the bracket is provided with recesses on both sides of the groove, and a limiting piece that is rotatably connected to the bracket is installed in the recess.

[0011] The sidewall of the catheter plate clamp is provided with an arc-shaped groove at the location opposite the limiting piece;

[0012] Rotate the limiting piece so that it is partially located within the arc-shaped groove, thereby limiting and installing the catheter plate clamp within the groove; rotate the limiting piece so that it is no longer located within the arc-shaped groove, making it easier to disassemble the catheter plate clamp.

[0013] Preferably, the vise is fixedly connected to the base via a support base plate. The support base plate is fixedly connected to the base, and both ends of the support base plate have upward protrusions at the locations of the positioning reference surface and the fixing block. The main body has recesses at the locations of the bottom of the positioning reference surface and the bottom of the fixing block that are adapted to the protrusions. The main body sits on the support base plate, and the protrusions enter the recesses and are fixedly connected by bolts provided on the side wall.

[0014] Preferably, a torque wrench is used to apply torque to the torque application end.

[0015] This invention also discloses a method for testing the torsion resistance of connectors / catheters in combined catheters, comprising the following steps:

[0016] S1: Select a torque wrench and guide plate clamp that are appropriate for the specifications of the combined guide tube to be tested;

[0017] S2: The guide plate clamp is assembled in the bracket, and the guide tube of the combined guide tube to be tested is installed in the guide plate clamp. The end to be tested of the combined guide tube to be tested is clamped between the clamp block and the positioning reference surface. The torque application end of the combined guide tube to be tested is located outside the guide plate clamp and is connected to the torque wrench, and it is ensured that the torque application end, the guide tube, and the end to be tested are coaxial during the process of being limited by the guide plate clamp and clamped by the vise.

[0018] S3: Draw a marking line at the part of the end to be tested that can rotate, and the marking line is parallel to the axis of the combined conduit to be tested;

[0019] S4: Apply torque to the preset qualified torque using the torque wrench;

[0020] S5: Observe whether the marking line is broken. If the marking line is not broken, the combined conduit to be tested is considered qualified. If the marking line is broken, observe the angle between the end of the broken marking line and the axis of the combined conduit to be tested. If the angle exceeds the preset value, the product is considered unqualified. If the angle does not exceed the preset value, it is considered qualified.

[0021] S6: Repeat steps S4 and S5 to ensure the reliability of the test results.

[0022] Preferably, the preset value is 2°.

[0023] Preferably, the torque wrench is a digital torque wrench.

[0024] This invention can test the torsional resistance of combined conduit test specimens with all connection methods, including but not limited to axial compression, rolling, radial compression, and welding. The structure of the torque application end is arbitrary, as long as it can be held and measured by a torque wrench. The end to be tested can be any pipe connection method that can be used with an adapter and tested by a compatible torque wrench, including but not limited to axial compression, rolling, radial compression, and welding.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. By setting one end of the vise as a positioning reference surface, setting the guide plate clamp as a detachable connection, and setting the guide groove of the guide plate clamp as eccentric or concentric, the present invention can ensure the coaxiality of the combined guide tubes during the measurement process while measuring combined guide tubes of different specifications.

[0027] 2. This invention can test the torsional resistance of combined conduit test specimens with various connection methods, and has a wider range of applications.

[0028] Based on the above reasons, this invention can be widely applied in fields such as the testing of the torsional performance of aviation pipelines. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram (concentric) of a device for testing the torsion resistance of a connector / catheter in a combined catheter according to a specific embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram (eccentric) of a device for testing the torsional resistance of connectors / catheters in a combined catheter according to a specific embodiment of the present invention.

[0032] Figure 3 This is an exploded view of a device for testing the torsional resistance of connectors / catheters in a combined catheter according to a specific embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the support structure in a specific embodiment of the present invention.

[0034] Figure 5 This is a sample diagram of the combined catheter to be tested in a specific embodiment of the present invention (without the adapter connected).

[0035] Figure 6 This is a sample diagram of a common end to be tested in a specific embodiment of the present invention.

[0036] Figure 7 The diagram below shows the line drawing of the combined catheter to be tested (connecting adapter) in a specific embodiment of the present invention.

[0037] In the diagram: 1. Base; 2. Vise; 21. Main body; 22. Positioning reference surface; 23. Fixing block; 24. Clamping block; 25. Lead screw; 26. Recess; 3. Support seat; 31. Bracket; 32. Guide plate clamp; 33. Guide groove; 34. Limiting piece; 35. Arc-shaped groove; 4. Support base plate; 41. Protrusion; 5. Combined guide tube to be tested; 51. Guide tube; 52. Testing end; 53. Torque application end. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0043] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0044] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0045] Example 1

[0046] like Figures 1-7 As shown, a device for testing the torsion resistance of connectors / catheters in combined catheters includes a base 1, on which a vise 2 and a support 3 are fixedly arranged side by side. The vise 2 is fixedly connected to the base 1 through a support base plate 4.

[0047] The vise 2 includes a main body 21. The upper end of the main body 21 has a positioning reference surface 22 and a fixing block 23 on both sides. A clamping block 24 is provided between the positioning reference surface 22 and the fixing block 23. A lead screw 25 passes through the fixing block 23 and is fixedly connected to the clamping block 24. The lead screw 25 is threadedly engaged with the fixing block 23. The main body 21 has a recess 26 at the bottom of the positioning reference surface 22 and the bottom of the fixing block 23.

[0048] The supporting base plate 4 is fixedly connected to the base 1, and both ends of the supporting base plate 4 have upward protrusions 41 at the locations of the positioning reference surface 22 and the fixing block 23. The main body 21 sits on the supporting base plate 4, and the protrusions 41 enter the recess 26 and are fixedly connected by bolts provided on the side wall.

[0049] The support base 3 includes two brackets 31 arranged vertically, with the lower bracket 31 fixedly connected to the base 1, one end of the upper bracket 31 hinged to one end of the lower bracket 31, and the other end of the upper bracket 31 fixedly connected to the other end of the lower bracket 31 by bolts; removing the bolts allows the two brackets 31 to be opened, and tightening the bolts allows the two brackets 31 to be locked together. The upper surface of the lower bracket 31 and the lower surface of the upper bracket 31 each have semi-circular grooves, which, when joined together, form a complete circle. A guide plate clamp 32 is detachably connected to each of the two grooves. The outer wall of the guide plate clamp 32 is adapted to the groove, and the inner wall is a semi-circular guide groove 33. The two guide grooves 33, when joined together, form a complete circle, and their inner walls are adapted to the outer wall of the guide tube 51 of the combined guide tube 5 to be tested. The end 52 of the combined guide tube 5 to be tested is located at the vise 2, clamped between the clamping block 24 and the positioning reference surface 22. A portion of the guide tube 51 is located within the guide plate clamp 32, and the torque application end 53 of the combined guide tube 5 to be tested is located outside the guide plate clamp 32. A torque is applied to the torque application end 53 using a torque wrench. A digital torque wrench is used. The structure of the torque application end 53 is arbitrary, as long as it can be clamped and measured by a torque wrench.

[0050] The conduit groove 33 is concentrically or eccentrically arranged with the recess. Different specifications of the combined conduit to be tested use different specifications of the conduit plate clamp 32 to ensure that the torque application end 53, the conduit 51, and the end to be tested 52 are coaxial during the process of being supported by the conduit groove 33 and clamped by the vise. When testing the largest specification combined conduit (e.g. Figure 1 As shown), the conduit groove 33 and the recess are arranged concentrically. When inspecting other specifications of combined conduits (such as...), Figure 2 As shown, the guide tube groove 33 and the groove are set eccentrically, which ensures that one side of the end to be tested 52 is always in contact with the positioning reference surface 22. After the specifications of the combined guide tube are changed, only the position of the guide tube 51 needs to be adjusted, that is, the eccentric setting is adopted, which can still ensure the coaxiality of the combined guide tube.

[0051] like Figure 4As shown, the bracket 31 has recesses on both sides of the groove, and a limiting piece 34 rotatably connected to the bracket 31 is installed in the recess. The side wall of the guide plate clamp 32 has an arc-shaped groove 35 opposite to the limiting piece 34. In this specific embodiment, the limiting piece is a full-length piece with a portion cut off. Rotating the limiting piece 34 so that its arcuate portion is within the arcuate groove 35, the guide plate clamp 34 is fixedly installed within the groove. Rotating the limiting piece 35 so that its arcuate portion is no longer within the arcuate groove 35, i.e., the cut-off portion is opposite to the outer edge of the arcuate groove 35, thus the limiting piece 35 no longer serves a limiting function, facilitating the quick disassembly of the guide plate clamp 32.

[0052] Example 2

[0053] like Figures 1-7 As shown, based on the apparatus provided in Embodiment 1, the present invention also discloses a method for testing the torsion resistance of connectors / catheters in combined catheters.

[0054] Includes the following steps:

[0055] S1: Select a torque wrench and guide plate clamp 32 that are appropriate for the specifications of the combined guide tube 5 to be tested;

[0056] This invention can test the torsional resistance of combined conduit test specimens with all connection methods, including but not limited to axial extrusion, rolling, radial extrusion, and welding. A sample diagram of the combined conduit test specimen is shown in Figure 5.

[0057] The test end 52, as shown in Figure 5, is an axial compression connection. This can be used to measure, but is not limited to, axial compression, rolling, radial compression, welding, and all other pipe connection methods that can be tested with an adapter and a torque wrench (as shown in Figure 6). For some connection types, the test end 52 is a sleeve nut structure that can rotate freely around the axis of the test piece (e.g.,...). Figure 5 As shown), therefore, a suitable adapter should be selected and tightened with the outer nut (as shown). Figure 7 As shown in the figure, ensure the stability of the test end 52 of the test piece.

[0058] The catheter 51 is an example of a combination catheter made of titanium tubes in this embodiment.

[0059] The structure of the torque application end 53 is arbitrary, as long as it can be held and measured by a torque wrench.

[0060] S2: The guide plate clamp 32 is assembled into the bracket 31, and the guide tube 51 of the combined guide tube 5 to be tested is installed in the guide plate clamp 32. The end 52 of the combined guide tube 5 to be tested is clamped between the clamp block 24 and the positioning reference surface 22. The torque application end 53 of the combined guide tube 5 to be tested is located outside the guide plate clamp 32 and is connected to the torque wrench. It is ensured that the torque application end 53, the guide tube 51, and the end 52 to be tested are coaxial during the process of being limited by the guide plate clamp 32 and clamped by the vise 2.

[0061] S3: Draw a marking line at the part of the end 52 to be detected that can rotate (e.g., ... Figure 7 As shown in the figure, the marking line is parallel to the axis of the combined catheter 5 to be tested;

[0062] S4: Apply torque to the preset qualified torque using the torque wrench;

[0063] The torque for tightening the adapter and outer nut should refer to HB 7000, as detailed in Table 1 below. Different test specimens have different torsional resistance; Table 1 also provides reference specifications for torque wrenches compatible with different sizes of test assembly guide tube 5.

[0064] Table 1 Tightening torque during test specimen installation.

[0065]

[0066] S5: Observe whether the marking line is broken. If the marking line is not broken, the combined conduit 5 to be tested is considered qualified. If the marking line is broken, observe the angle between the end of the broken marking line and the axis of the combined conduit 5 to be tested. If the angle exceeds the preset value, the product is considered unqualified. If the angle does not exceed the preset value, it is considered qualified. The preset value is 2°.

[0067] S6: Repeat steps S4 and S5 to ensure the reliability of the test results.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for testing the torsional resistance of connectors / catheters in combined catheters, characterized in that, Includes a base, on which a vise and a support are fixed side by side; The vise includes a main body, and positioning reference surfaces and fixing blocks are respectively provided on both sides of the upper end of the main body. A clamping block is provided between the positioning reference surface and the fixing block. A lead screw passes through the fixing block and is fixedly connected to the clamping block, and the lead screw is threadedly engaged with the fixing block. The support base includes two brackets arranged vertically, with the lower bracket fixedly connected to the base. One end of the upper bracket is hinged to one end of the lower bracket, and the other end of the upper bracket is fixedly connected to the other end of the lower bracket by bolts. The upper surface of the lower bracket and the lower surface of the upper bracket each have a semi-circular groove, and the two grooves are joined together to form a complete circle. A guide plate clamp is detachably connected to each of the two grooves. The outer wall of the guide plate clamp is adapted to the groove, and the inner wall is a semi-circular guide groove. The two guide grooves are joined together to form a complete circle, and the inner wall is adapted to the outer wall of the combined guide tube to be tested. The end of the combined catheter to be tested is located at the vise, clamped between the clamping block and the positioning reference surface. Part of the catheter is located inside the catheter plate clamp, and the torque application end of the combined catheter to be tested is located outside the catheter plate clamp.

2. The device for testing the torsional resistance of connectors / catheters in combined catheters according to claim 1, characterized in that, The conduit groove and the recess are arranged concentrically or eccentrically. Different specifications of the combined conduits to be tested are equipped with different specifications of the conduit plate clamps to ensure that the torque application end, the conduit, and the end to be tested are coaxial during the process of being limited by the conduit plate clamps and clamped by the vise.

3. The device for testing the torsional resistance of connectors / catheters in combined catheters according to claim 1, characterized in that, The bracket has recesses on both sides of the groove, and a limiting piece that is rotatably connected to the bracket is installed in the recess. The sidewall of the catheter plate clamp is provided with an arc-shaped groove at the location opposite the limiting piece; Rotate the limiting piece so that it is partially located within the arc-shaped groove, thereby limiting and installing the catheter plate clamp within the groove; rotate the limiting piece so that it is no longer located within the arc-shaped groove, making it easier to disassemble the catheter plate clamp.

4. The device for testing the torsional resistance of connectors / catheters in combined catheters according to claim 1, characterized in that, The vise is fixedly connected to the base via a support base plate. The support base plate is fixedly connected to the base, and both ends of the support base plate have upward protrusions at the locations of the positioning reference surface and the fixing block. The main body has recesses at the locations of the bottom of the positioning reference surface and the bottom of the fixing block that are adapted to the protrusions. The main body sits on the support base plate, and the protrusions enter the recesses and are fixedly connected by bolts provided on the side wall.

5. The device for testing the torsional resistance of connectors / catheters in combined catheters according to claim 1, characterized in that, A torque is applied to the torque application end using a torque wrench.

6. A method for testing the torsional resistance of connectors / catheters in combined catheters, characterized in that, The apparatus according to any one of claims 1 to 5 comprises the following steps: S1: Select a torque wrench and guide plate clamp that are appropriate for the specifications of the combined guide tube to be tested; S2: The guide plate clamp is assembled in the bracket, and the guide tube of the combined guide tube to be tested is installed in the guide plate clamp. The end to be tested of the combined guide tube to be tested is clamped between the clamp block and the positioning reference surface. The torque application end of the combined guide tube to be tested is located outside the guide plate clamp and is connected to the torque wrench, and it is ensured that the torque application end, the guide tube, and the end to be tested are coaxial during the process of being limited by the guide plate clamp and clamped by the vise. S3: Draw a marking line at the part of the end to be tested that can rotate, and the marking line is parallel to the axis of the combined conduit to be tested; S4: Apply torque to the preset qualified torque using the torque wrench; S5: Observe whether the marking line is broken. If the marking line is not broken, the combined conduit to be tested is considered qualified. If the marking line is broken, observe the angle between the end of the broken marking line and the axis of the combined conduit to be tested. If the angle exceeds the preset value, the product is considered unqualified. If the angle does not exceed the preset value, it is considered qualified.

7. A method for testing the torsional resistance of connectors / catheters in combined catheters according to claim 6, characterized in that, The preset value is 2°.

Images