A NOL ring patch auxiliary tooling

Abstract

The present invention discloses an auxiliary tooling for patching NOL rings, comprising a ring tube, the ring tube comprising an annular tube body open at both ends, the outer side of the tube body being provided with at least one set of symmetrical positioning devices, the positioning devices comprising two positioning lines symmetrical about the central axis of the tube body; and a plurality of pressure strips, the number of which is the same as the positioning lines, arranged along the outer side of the tube body along the axis of the tube body. The pressure strips have a clamping position, in which the pressure strips are parallel to the axis of the tube body, and a clamping space is formed between the pressure strips and the outer side of the tube body for clamping the NOL ring. This application ensures the symmetrical and precise position of the strain gauges attached to the NOL ring, improves the adhesion quality of the strain gauges, and ensures the adhesion accuracy. This arrangement improves the efficiency of strain gauge attachment, facilitates operation by inexperienced personnel, and reduces the requirement for strong manual skills of the operator.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary tooling, and in particular to an auxiliary tooling for a NOL ring patch. Background Art

[0002] Carbon fiber wound composites have high specific strength, specific modulus, good heat resistance, and corrosion resistance. They are used to manufacture pressure vessels and are widely used in the aerospace field. These pressure vessels are formed by fiber winding, and the design is usually analyzed using grid theory. Grid theory ignores collective stiffness, and the load is borne by the fiber. The NOL ring is a composite annular test piece formed by unidirectional fiber winding. Its performance is a measure of the interfacial wettability and bonding between the fiber and the resin matrix, as well as its ability to transfer stress under stress. It can provide process parameters for fiber-wound pressure vessels. The performance characterization of NOL rings is usually carried out according to GB / T 1458.

[0003] In the NOL ring tensile test, attaching strain gauges symmetrically on the outer surface of the ring is a critical step. Unreliable strain gauge attachment can severely affect strain, and thus the final test results. However, strain gauge attachment is typically performed by the operator holding the strain gauge and manually positioning it. Furthermore, the NOL ring test piece is a circular specimen that cannot be stably placed on a workbench, resulting in low attachment efficiency and the inability to reliably position the strain gauge. More seriously, inaccurate strain gauge placement leads to deviations in strain testing, which in turn affects the accuracy and stability of data acquisition. Summary of the Invention

[0004] The purpose of the present invention is to provide a NOL ring patch auxiliary tooling to solve the problems of low efficiency and poor accuracy of NOL ring strain gauge pasting in the prior art.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] An auxiliary tool for NOL ring patch, comprising:

[0007] The ring tube comprises an annular tube body with two ends open, the outer side of the tube body being provided with at least one set of symmetrical positioning devices, the positioning devices comprising two positioning lines symmetrical about the central axis of the tube body;

[0008] The number of the pressure strips is the same as the number of the positioning lines, and the pressure strips are arranged on the outer side surface of the tube body along the axial direction of the tube body. The pressure strips have a clamping position. At the clamping position, the pressure strips are parallel to the axis of the tube body, and a clamping space for clamping the NOL ring is formed between the pressure strips and the outer side surface of the tube body.

[0009] Furthermore, an adjustment seat mounting surface is provided on the outer side surface of one end of the tube body, and a connecting ear is provided on the inner side surface of the other end of the tube body;

[0010] One end of the pressure strip is rotatably connected to the mounting surface of the adjustment seat through a connecting piece, and the other end is fixed by a C-shaped clip rotatably connected to the connecting ear.

[0011] Furthermore, the connecting member includes an adjustment seat, and the adjustment seat is connected to the adjustment seat mounting surface via a first screw assembly;

[0012] The pressure strip is connected to the adjustment seat via a second screw assembly.

[0013] Furthermore, the first screw assembly includes a hexagon socket screw, a silicone gasket and a hexagon nut, the hexagon socket screw passes through the adjustment seat and the adjustment seat mounting surface and is fastened by the hexagon nut;

[0014] A silicone gasket is provided between the hexagonal nut and the mounting surface of the adjustment seat;

[0015] An adjusting washer is detachably provided on the hexagon socket screw between the adjusting seat and the adjusting seat mounting surface.

[0016] Furthermore, one end of the C-shaped clip is connected to the connecting ear, and the other end is connected to a butterfly screw for fixing the pressure strip.

[0017] Furthermore, a soft pad is provided on the inner side of the pressure strip.

[0018] Furthermore, it also includes a base, the base is provided with a supporting device, the supporting device includes a supporting rod connected to the base and a raising column sleeved on the bottom end of the supporting rod;

[0019] The tube body is provided with a matching hole which is symmetrical with respect to the central axis of the tube body and matches the support rod, and the support rod and the matching hole are plug-connected.

[0020] Furthermore, there are two support rods, and the two matching holes located on the same side of the tube body are arranged at both ends of the positioning line.

[0021] Furthermore, the tube body is provided with at least one weight-reducing groove, and the area occupied by the weight-reducing groove does not exceed 50% of the surface area of ​​the tube body.

[0022] Furthermore, a handle is provided on the base.

[0023] According to the above technical solution, the beneficial effects of the present invention are:

[0024] When the present application is in use, the NOL ring is sleeved on the outer periphery of the tube body, and the tube body can ensure the support effect of the NOL ring. By adjusting the pressure strip to the clamping position, the NOL ring can be fixed to the outer periphery of the tube body. There is no need to hold the NOL ring during subsequent manual patching, which frees up both hands. Positioning lines symmetrical about the central axis of the tube body are set on the tube body. When patching, the patch is patched along the two positioning lines respectively, which ensures that the position of the strain gauge pasted on the NOL ring is symmetrical and accurate, improves the bonding quality of the strain gauge, and ensures the pasting accuracy. This setting improves the efficiency of pasting the strain gauge, facilitates operation by inexperienced personnel, and reduces the requirement for the operator to have strong hands-on ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the main view of this application;

[0026] Figure 2 This is the left side view of the application;

[0027] Figure 3 A top view of the present application;

[0028] Figure 4 This is a cross-sectional view of the connection between the adjustment seat and the pipe body of this application;

[0029] Figure 5 This is a schematic diagram of the structure of the ring pipe in this application;

[0030] Figure 6 This is a schematic diagram of the structure of the layering strip in this application;

[0031] Figure 7 This is the axonometric drawing of this application.

[0032] Among them: 1. Ring tube; 1-1. Tube body; 1-2. Weight reduction groove; 1-3. Connecting ear; 1-4. Positioning line; 1-5. Adjustment seat mounting surface; 1-6. Matching hole; 2. Base; 3. Pressure strip; 4. C-type clamp; 5. Butterfly screw; 6. Spacer column; 7. Adjustment seat; 8. Hexagonal nut; 9. Silicone gasket; 10. Nut; 11. Hexagon socket screw; 12. Flat washer; 13. Hexagon socket head shoulder screw; 14. Handle; 15. Support rod. Implementation Method

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0034] It should be noted that, in the description of the present invention, the terms "front," "rear," "left," "right," "up," "down," "inside," and "outside" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are intended solely to facilitate the description of the present invention and do not require that the present invention be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "front," "rear," "left," "right," "up," and "down" used in the description of the present invention refer to directions in the accompanying drawings, and the terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0035] This application solves the problem of low efficiency and poor positioning accuracy in the current manual process of pasting strain gauges on NOL rings.

[0036] like Figures 1 to 7 As shown, a NOL ring patch auxiliary tooling includes a ring tube 1, the ring tube 1 includes a ring-shaped tube body 1-1 with openings at both ends, and the outer side surface of the tube body 1-1 is provided with at least one set of symmetrical positioning devices, the positioning devices include two positioning lines 1-4 symmetrical about the central axis of the tube body 1-1; it also includes the same number of pressure strips 3 as the positioning lines 1-4, the pressure strips 3 are arranged on the outer side surface of the tube body 1-1 along the axial direction of the tube body 1-1, the pressure strips 3 have a clamping position, in the clamping position, the pressure strips 3 and the axis of the tube body 1-1 are parallel, and a clamping space for clamping the NOL ring is formed between the pressure strips 3 and the outer side surface of the tube body 1-1.

[0037] When the present application is in use, the NOL ring is sleeved on the outer periphery of the tube body, and the tube body can ensure the support effect of the NOL ring. By adjusting the pressure strip to the clamping position, the NOL ring can be fixed to the outer periphery of the tube body. There is no need to hold the NOL ring during subsequent manual patching, which frees up both hands. Positioning lines symmetrical about the central axis of the tube body are set on the tube body. When patching, the patch is patched along the two positioning lines respectively, which ensures that the position of the strain gauge pasted on the NOL ring is symmetrical and accurate, improves the bonding quality of the strain gauge, and ensures the pasting accuracy. This setting improves the efficiency of pasting the strain gauge, facilitates operation by inexperienced personnel, and reduces the requirement for the operator to have strong hands-on ability.

[0038] In this application, the ring tube 1 is used to support the annular sample. The material of the ring tube 1 can be steel or carbon fiber composite material with a thickness of 2~5mm. The outer diameter of the tube body 1-1 in the ring tube is slightly smaller than the inner diameter of the NOL ring sample, so that the NOL ring sample is not subjected to outward extrusion force when it is inserted into the tube body 1-1.

[0039] In the present application, the beading 3 also has an installation position that is convenient for installing the NOL ring. At the installation position, the angle between the beading 3 and the outer side surface of the tube body 1-1 is greater than 90°. By placing the beading 3 at this installation position, the NOL ring can be easily sleeved on the tube body 1-1 and the beading 3 can be easily removed from the tube body 1-1.

[0040] The positioning device can be one group or two groups. The two groups of positioning devices have four positioning lines 1-4, and are correspondingly equipped with four pressure strips 3. The drawings of this application show the situation of one group of positioning devices.

[0041] In some further embodiments, the pressure strip 3 is connected via a connector and a C-clip 4. Specifically, Figure 5 As shown, the outer side surface of the rear end of the tube body 1-1 is provided with an adjustment seat mounting surface 1-5, and the inner side surface of the front end of the tube body 1-1 is provided with a connecting ear 1-3. One end of the pressure strip 3 is rotatably connected to the adjustment seat mounting surface 1-5 through a connecting piece, and the other end is fixed by a C-type clamp 4 rotatably connected to the connecting ear 1-3. The C-type clamp 4 is also provided with a butterfly screw 5 for fixing the pressure strip 3.

[0042] The connector and C-shaped clamp designed to connect the adjustment seat are located at both ends of the tube body, which can ensure the fixing effect of the adjustment seat on the NOL ring. The design of the connection between the C-shaped clamp and the inner side of the tube body will not hinder the NOL from being installed on the tube body, making it easy to install and remove the NOL ring.

[0043] Specifically, the connecting part includes an adjusting seat 7, which is connected to the adjusting seat mounting surface 1-5 through a first screw assembly; the first screw assembly includes a hexagon socket screw 11, a silicone gasket 9 and a hexagonal nut 8, and the hexagon socket screw 11 passes through the adjusting seat 7 and the adjusting seat mounting surface 1-5 and is fastened by the hexagonal nut 8; and a silicone gasket 9 is provided between the hexagonal nut 8 and the adjusting seat mounting surface 1-5.

[0044] Furthermore, an adjusting washer is detachably provided on the hexagon socket screw 11 between the adjusting seat 7 and the adjusting seat mounting surface 1 - 5 .

[0045] By setting a silicone gasket between the hexagonal nut and the mounting surface of the adjustment seat, the curved surface on the inner side of the tube body 1-1 can be compensated by the silicone gasket to ensure the connection effect of the hexagonal nut; by setting an adjustment gasket between the adjustment seat and the mounting surface of the adjustment seat, the distance between the pressure strip and the outer side surface of the tube body can be adjusted, and the height size of the clamping space can be adjusted to accommodate patches of NOL rings of different thicknesses.

[0046] The pressure strip 3 is connected to the adjustment seat 7 through a second screw assembly, and the second screw assembly includes a nut 10, a flat washer 12 and a hexagon socket head shoulder screw 13. The pressure strip 3 and the adjustment seat 7 are connected through the hexagon socket head shoulder screw 13, the flat washer 12 and the nut 10. After connection, they can be rotated for use.

[0047] In some further embodiments, soft silicone is provided below the pressing strip 3 so as to apply uniform pressure to the NOL ring test piece during pressing.

[0048] During use, loosen the butterfly nut. Once the C-clamp is rotated down, the front end is free of obstructions, and the NOL ring specimen is fully inserted onto the outer surface of the tube body 1-1. After the pressure strip 3 and the adjustment seat 7 are connected, the pressure strip 3 is applied via the butterfly screw 5 on the C-clamp 4. The pressure is then transferred to the NOL ring specimen through the pressure strip 3 and the soft silicone rubber.

[0049] In some further embodiments, the auxiliary tooling further comprises a base 2, on which is provided a support device, comprising a heightening column 6 detachably connected to the base 2 and a support rod 15 connected to the heightening column 6 and having an outer diameter smaller than that of the heightening column 6. The tube body 1-1 is provided with mating holes 1-6 symmetrical about the central axis of the tube body 1-1 and adapted to fit the support rod 15. When in use, the support rod 15 can be inserted into the mating holes 1-6 of the tube body 1-1, and the heightening column 6 at the bottom can support the tube body. There are at least two support rods 15 to ensure support and fixation of the tube body.

[0050] By setting the supporting rod connection matching holes, the tube body can be supported. The raising column is set at the bottom end of the supporting rod to support the tube body. When the ring tube 1 is connected to the base, it has a suspended effect and does not contact the base, which is convenient for patching. By setting matching holes symmetrical about the central axis of the tube body 1-1, the position of the ring tube 1 can be adjusted by flipping the ring tube 1, which is convenient for patching.

[0051] In some further embodiments, mating holes 1-6 are located at both ends of positioning line 1-4. Because support rod 15 is connected to base 2 and is perpendicular to base 2, when the tube body is installed on support rod 15, mating holes 1-6 are located on the upper surface of the tube body, and thus positioning line 1-4 is located on the upper surface of the tube body. This design makes it easier for the operator to attach the strain gauge. After attaching the upper strain gauge, the position of the ring tube 1 can be adjusted to align positioning line 1-4, which was originally located directly below, with the upper surface, facilitating the attachment of the strain gauge.

[0052] In some further embodiments, the base 2 is used to place and carry the annular tube 1. Two symmetrical handles 14 are provided on the base 2, and the handles 14 are connected to the base 2 by welding or bolting. The support rods 15 are provided with detachable support posts 6 at the bottom. When the annular tube is inserted into the base 2, the annular tube 1 is suspended in the air and does not touch the bottom of the base 2.

[0053] In some further embodiments, a plurality of weight-reducing grooves 1-2 are evenly distributed on the tube body 1-1, and the area occupied by the weight-reducing grooves 1-2 does not exceed 50% of the surface area of ​​the annular tube. A 180° symmetrical connecting ear 1-3 is provided on the inner wall of one side of the tube body 1-1, and the connecting ear 1-3 and the inner wall of the tube body 1-1 are connected by welding. A 180° symmetrical adjustment seat mounting surface 1-5 is provided on the outer wall of the other side of the tube body 1-1, and the adjustment seat mounting surface is spotfaced. Symmetrical matching holes 1-6 are provided on the outer walls on both sides of the tube body 1-1, and the areas around the matching holes 1-6 are spotfaced. The annular tube 1 is inserted into the support rod 15 of the base 2 through the matching holes 1-6 thereon, and the areas around the matching holes 1-6 are spotfaced to ensure that the annular tube can be placed stably on the base.

[0054] Through the above settings, the present application has the following advantages: 1. The structure is light and simple, easy to carry and use. 2. A workbench is provided to free your hands for the strain gauge pasting process. 3. The efficiency of pasting strain gauges is improved, which is convenient for inexperienced personnel to operate and reduces the requirement for operators to have strong hands-on ability. 4. The strain gauge can be more accurately pasted on the symmetrical surface of the NOL ring specimen, thereby improving the bonding quality of the strain gauge. 5. The accuracy and reliability of strain test data are improved. 6. Low cost and convenient processing and manufacturing.

[0055] The use process of this application can be as follows: grab the two handles of the base 2, place the base 2 on the operating platform, and insert the raising column 6 into the support rod 15. The C-type clamp 4 is connected to the welding connection ear 1-3 on the inner side of the tube body 1-1 through a hexagonal cylindrical head shoulder screw, a gasket and a nut. After connection, the C-type clamp 4 is rotated to the inside of the ring tube, and multiple NOL ring test pieces are inserted into the outside of the tube body 1-1 so that the inner diameter of the NOL ring is in contact with the outer diameter of the tube body 1-1. Insert the tube body 1-1 into the support rod 15 through the matching hole 1-6, and the ring tube 1 is naturally suspended. According to the thickness of the NOL ring test piece, select a suitable gasket and place it between the adjustment seat 7 and the adjustment seat mounting surface 1-5. Connect the ring tube 1 and the adjustment seat through two hexagonal cylindrical head shoulder screws 11, silicone gasket 9 and hexagonal nut 8. The pressure strip 3 is connected to the adjustment seat 7 through a hexagonal cylindrical head shoulder screw 13, a gasket 12 and a nut 10. Flip the C-clamp 4 to the outside of the tube body 1-1. Use the butterfly screw 5 on the C-clamp 4 to apply a certain force to the pressure strip 3 to secure it. Using the positioning line 1-4 as a reference, attach the strain gauge on one side of the NOL ring to the NOL ring specimen. Remove the ring from the support rod 15 and flip it 180°. Using the positioning line on the other side as a reference, attach the strain gauge on the other side of the NOL ring specimen. After attaching the strain gauge to the NOL ring specimen, loosen the butterfly screw 5, rotate the C-clamp 4 to the inside of the tube body 1-1, rotate the pressure plate, and remove the NOL ring specimen with the attached strain gauge.

[0056] This application provides an auxiliary tool for attaching NOL ring strain gauges, featuring a rational design, simple structure, ease of fabrication, compact size, and ease of use. This tool provides a workbench, freeing hands for strain gauge attachment, improving efficiency and facilitating operation for inexperienced operators, while reducing the need for strong manual skills. Furthermore, it enables more precise attachment of strain gauges to the symmetrical surfaces of NOL ring specimens, improving the quality of strain gauge bonding and significantly enhancing the accuracy and reliability of strain test data.

[0057] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A NOL ring patch auxiliary tooling, characterized in that: include: An annular tube (1) comprises an annular tube body (1-1) with openings at both ends, wherein the outer side surface of the tube body (1-1) is provided with at least one set of symmetrical positioning devices, wherein the positioning devices comprise two positioning lines (1-4) symmetrical about the central axis of the tube body (1-1); The number of the pressure strips (3) is the same as that of the positioning lines (1-4), and the pressure strips (3) are arranged on the outer side surface of the tube body (1-1) along the axial direction of the tube body (1-1). The pressure strips (3) have a clamping position. At the clamping position, the axes of the pressure strips (3) and the tube body (1-1) are parallel, and a clamping space for clamping the NOL ring is formed between the pressure strips (3) and the outer side surface of the tube body (1-1).

2. The NOL ring patch auxiliary tooling according to claim 1, characterized in that: An adjustment seat mounting surface (1-5) is provided on the outer side surface of one end of the tube body (1-1), and a connecting ear (1-3) is provided on the inner side surface of the other end of the tube body (1-1); One end of the pressure strip (3) is rotatably connected to the adjustment seat mounting surface (1-5) via a connecting piece, and the other end is fixed via a C-shaped clip (4) rotatably connected to the connecting ear (1-3).

3. The NOL ring patch auxiliary tooling according to claim 2, characterized in that: The connecting member comprises an adjustment seat (7), and the adjustment seat (7) is connected to the adjustment seat mounting surface (1-5) via a first screw assembly; The pressure strip (3) is connected to the adjustment seat (7) via a second screw assembly.

4. The NOL ring patch auxiliary tooling according to claim 3, characterized in that: The first screw assembly comprises a hexagon socket screw (11), a silicone gasket (9) and a hexagon nut (8), wherein the hexagon socket screw (11) passes through the adjustment seat (7) and the adjustment seat mounting surface (1-5) and is fastened by the hexagon nut (8); A silicone gasket (9) is provided between the hexagonal nut (8) and the adjustment seat mounting surface (1-5); An adjusting washer is detachably provided on the hexagon socket screw (11) between the adjusting seat (7) and the adjusting seat mounting surface (1-5).

5. The NOL ring patch auxiliary tooling according to claim 2, characterized in that: One end of the C-shaped clip (4) is connected to the connecting ear (1-3), and the other end is connected to a butterfly screw (5) for fixing the pressure strip (3).

6. The NOL ring patch auxiliary tooling according to claim 1, characterized in that: The inner side of the pressure strip (3) is provided with a soft pad.

7. The NOL ring patch auxiliary tooling according to claim 1, characterized in that: It also includes a base (2), wherein the base (2) is provided with a support device, wherein the support device includes a support rod (15) connected to the base (2) and a heightening column (6) sleeved on the bottom end of the support rod (15); The tube body (1-1) is provided with a matching hole (1-6) which is symmetrical about the central axis of the tube body (1-1) and matches the support rod (15); the support rod (15) and the matching hole (1-6) are plug-connected.

8. The NOL ring patch auxiliary tooling according to claim 7, characterized in that: There are two support rods (15), and the two matching holes (1-6) located on the same side of the tube body (1-1) are arranged at both ends of the positioning line (1-4).

9. The NOL ring patch auxiliary tooling according to claim 1, characterized in that: At least one weight-reducing groove (1-2) is provided on the tube body (1-1), and the area occupied by the weight-reducing groove (1-2) does not exceed 50% of the surface area of ​​the tube body (1-1).

10. The NOL ring patch auxiliary tooling according to claim 7, characterized in that: The base (2) is also provided with a handle (14).

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