Testing device for testing high-temperature performance of wire rod in non-contact manner

Abstract

The utility model discloses a non-contact testing device for testing the high-temperature performance of a wire rod, which comprises an environment box and a mounting rod, the mounting rod is arranged at the front part of a box door of the environment box, quartz glass is embedded in the center of the box door of the environment box, two fixing frames are arranged outside the mounting rod, and the fixing frames are fixed on the mounting rod. An adjustable adjusting frame is connected between the two fixing frames, a video extensometer and a green light source are arranged on the adjusting frame, the green light source is arranged on the side edge of the front portion of the video extensometer, an upper chuck and a lower chuck are connected to the upper position and the lower position in the environment box through sleeves respectively, and the upper chuck and the lower chuck are symmetrically arranged. Conical cavities are formed in the upper chuck and the lower chuck, and two wedge blocks are symmetrically embedded in the conical cavities; according to the testing device for non-contact testing of the high-temperature performance of the wire rod, the probability of jaw breaking, slipping and the like in the stretching process of the wire rod can be greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of wire testing, and in particular to a non-contact testing device for testing the high-temperature performance of wires. Background Technology

[0002] Metal wire has a wide range of applications, including power, communications, construction, aerospace, and machinery manufacturing. For example, steel cables such as QS87Mn and QS92Si can be rolled and then further processed into various specifications of steel wires, which can then be twisted into steel wire ropes for use in high-strength cables for bridges. To cope with the selection of wires under different environments and loads, the mechanical properties testing of wires is particularly important.

[0003] In traditional wire high-temperature tensile testing, clamps often employ rigid clamping or hydraulic locking methods, which present the following problems:

[0004] 1. Uneven clamping force: This can easily lead to scratches or deformation on the wire surface;

[0005] 2. Stress concentration: Excessive local stress in the clamping area affects the mechanical properties of the wire;

[0006] 3. Poor adaptability: It is difficult to adapt to wires of different diameters or materials, has poor coaxiality, and has high replacement costs.

[0007] This leads to a high risk of jaw breakage, slippage, and coaxiality abnormalities during high-temperature tensile testing of wires, rendering the test data invalid and making it impossible to accurately assess the tensile properties of the material. Existing technologies have addressed this by adding friction plates or spring structures to increase clamping force, but these methods are complex and difficult to maintain.

[0008] Furthermore, during testing, traditional contact extensometers can cause localized deformation of the specimen due to its own weight, increasing the error in axial strain measurement. For specimens made of softer materials, contact extensometers are prone to creating defects on the specimen surface, leading to abnormal fracture. At the same time, due to the limitations of the clamping structure of contact extensometers, it is impossible to ensure that slippage and over-clamping are completely eliminated for small-diameter specimens.

[0009] Therefore, there is an urgent need for a non-contact testing device that can uniformly distribute clamping force, avoid the introduction of lateral force, reduce wire damage, and simplify operation for testing the high-temperature performance of wires. Utility Model Content

[0010] The main objective of this invention is to provide a non-contact testing device for testing the high-temperature performance of wires, which can effectively solve the problems mentioned in the background art.

[0011] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0012] A non-contact testing device for high-temperature performance of wire includes an environmental chamber and a mounting rod. The mounting rod is located at the front of the door of the environmental chamber. Quartz glass is embedded in the center of the door of the environmental chamber. Two fixing frames are installed on the outside of the mounting rod. An adjustable adjustment frame is connected between the two fixing frames. A video extensometer and a green light source are installed on the adjustment frame. The green light source is located at the front side of the video extensometer.

[0013] The environmental chamber has upper and lower clamps connected by sleeves at its upper and lower positions respectively. The upper and lower clamps are symmetrically arranged, and each of the upper and lower clamps has a conical cavity. Two wedge blocks are symmetrically embedded inside the conical cavity, and a central groove is opened at the center line of the opposite side of the two wedge blocks.

[0014] As a further embodiment of this utility model, the front parts of the upper and lower clamps are fitted with limit plates by fixing bolts on both sides.

[0015] As a further embodiment of this utility model, the intermediate groove is arranged in a 1 / 3 circumferential arc shape.

[0016] As a further embodiment of this utility model, the adjusting frame includes a movable block, and a screw and two guide rods are provided through the sides of the two fixed frames and inside the movable block. The movable block is provided with a guide sleeve and a threaded sleeve that are adapted to the guide rods and the screw respectively. The movable block is connected to a movable arm through a rotating shaft, and a sliding plate is fixedly connected to the end of the movable arm. A slider is slidably connected to the top inner side of the sliding plate, and a connecting seat is fixedly connected to the top of the slider.

[0017] As a further embodiment of this invention, the bottom of the video extensometer is movably connected to the connecting seat via a damping pivot.

[0018] As a further embodiment of this utility model, the video extensometer is positioned directly opposite the quartz glass, and the green light source is fixedly installed at the end of the slide plate near the side.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1: The clamping force of the wedge block is evenly distributed in the middle groove, eliminating the damage to the sample surface caused by the original tooling. Before the improvement, only 30% of the experimental data of the test sample were valid. After the improvement, it can ensure that the fracture position of 90% of the test samples is within the gauge length, and valid data can be obtained. This greatly reduces the probability of jaw breakage and slippage during wire stretching.

[0021] 2: The inner groove of the wedge block has a certain guiding effect on the installation process of wire samples, which improves the stability of the tensile process. It is suitable for tensile testing of high-strength alloy wires and other wires. It is easy to install in high-temperature environments, assists testers in installing samples, and ensures that the samples are coaxial with the tooling. It is safe and effective. The inner groove facilitates sample installation, ensures the coaxiality of the samples, and effectively avoids burns to personnel during high-temperature testing.

[0022] 3: The video extensometer is used for precise tracking without lateral force. At the same time, it can track and analyze the axial or local strain of each area of ​​the parallel section, which is highly practical.

[0023] 4. The structure is simple. By changing the wedge blocks with different specifications of intermediate slots, it can be adapted to multiple specifications of wires, reducing downtime, effectively saving costs and improving work efficiency.

[0024] 5: The adjustable frame makes the video extensometer highly adjustable, ensuring that the sample is clearly visible in the field of view of the video extensometer and accurately tracking the gauge length deformation. It is also equipped with a green light source to ensure a clear field of view and accurate tracking of gauge length changes. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a non-contact testing device for testing the high-temperature performance of wires according to this utility model.

[0026] Figure 2 This is a cross-sectional view of the environmental chamber of a non-contact testing device for testing the high-temperature performance of wires according to this utility model.

[0027] Figure 3 This is an exploded view of the lower clamp of a non-contact testing device for testing the high-temperature performance of wires according to this utility model;

[0028] Figure 4 This is a structural diagram of the adjustment frame of a non-contact testing device for testing the high-temperature performance of wires according to this utility model.

[0029] In the diagram: 1. Environmental chamber; 2. Quartz glass; 3. Mounting rod; 4. Fixing frame; 5. Adjusting frame; 6. Video extensometer; 7. Green light source; 8. Upper chuck; 9. Lower chuck; 10. Conical cavity; 11. Wedge block; 12. Intermediate groove; 13. Movable block; 14. Guide rod; 15. Screw; 16. Movable arm; 17. Slide plate; 18. Slider; 19. Connecting seat. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0031] like Figure 1-4 As shown, a non-contact testing device for high-temperature performance of wire includes an environmental chamber 1 and a mounting rod 3. The mounting rod 3 is located at the front of the door of the environmental chamber 1. A quartz glass 2 is embedded in the center of the door of the environmental chamber 1. Two fixing frames 4 are installed on the outside of the mounting rod 3. An adjustable adjustment frame 5 is connected between the two fixing frames 4. A video extensometer 6 and a green light source 7 are installed on the adjustment frame 5. The green light source 7 is located at the front side of the video extensometer 6.

[0032] The upper and lower positions inside the environmental chamber 1 are respectively connected by sleeves to the upper chuck 8 and the lower chuck 9. The upper chuck 8 and the lower chuck 9 are symmetrically arranged, and each of the upper chuck 8 and the lower chuck 9 has a conical cavity 10. Two wedge blocks 11 are symmetrically embedded inside the conical cavity 10, and a middle groove 12 is opened at the center line of the opposite side of the two wedge blocks 11.

[0033] Limiting plates are installed on both sides of the front of the upper chuck 8 and the lower chuck 9 by fixing bolts, and the middle groove 12 is set in a 1 / 3 circumferential arc shape.

[0034] Specifically, by setting a limiting plate to block the front of the conical cavity 10, the wedge block 11 is limited and fixed. At the same time, the fixing bolts facilitate the removal of the limiting plate, thereby facilitating the replacement of the wedge block 11.

[0035] The adjusting frame 5 includes a movable block 13. A screw 15 and two guide rods 14 are provided through the sides of the two fixed frames 4 and inside the movable block 13. The movable block 13 is provided with guide sleeves and threaded sleeves that are adapted to the guide rods 14 and screws 15 respectively. The movable block 13 is connected to a movable arm 16 through a rotating shaft. The end of the movable arm 16 is fixedly connected to a slide plate 17. A slider 18 is slidably connected to the inner top of the slide plate 17. A connecting seat 19 is fixedly connected to the top of the slider 18.

[0036] The bottom of the video extensometer 6 is movably connected to the connecting seat 19 via a damping pivot.

[0037] Specifically, by rotating the lever of the movable arm 16 in conjunction with the rotation of the video extensometer 6 via the damping shaft, the orientation of the video extensometer 6 can be flexibly adjusted to adapt to the environmental box 1 for use.

[0038] The video extensometer 6 is directly opposite the quartz glass 2, and the green light source 7 is fixedly installed at the end of the slide plate 17 near the side.

[0039] It should be noted that this utility model is a non-contact testing device for the high-temperature performance of wires. In use, after cleaning and measuring the sample, a high-temperature resistant paint is sprayed onto its surface to create a speckled pattern. After the speckled pattern dries, the original gauge length is drawn on the uncoated area. Then, the sample with the measured dimensions and marked gauge length and speckled feature points is inserted along the central groove 12 into the central groove 12 of the wedge block 11 inside the upper clamp 8. The clamping length should be greater than four-fifths of the depth of the wedge block 11. A fixed limiting plate then secures the wedge block 11 inside the upper clamp 8. After clamping the upper clamp 8, the force value is zeroed, and the program is set to the sample force protection state. The tooling position is adjusted to fix the wedge block 11 inside the lower clamp 9, ensuring the wedge block 11 firmly clamps the wire. The sample clamping effect is then checked to ensure a tight fit between the wire sample and the wedge block 11. Apply an initial force less than 5% of the estimated yield strength, and install the clamped upper clamp 8 and lower clamp 9 into the installation environment chamber 1. Simultaneously install the video extensometer 6, and adjust the distance between the video extensometer 6 and the sample until the characteristic points on the sample surface are clearly observed in the field of view of the video extensometer 6. Use the green light source 7 to reconfirm the coaxiality of the wire and the wedge block 11, turn on the heating of the environment chamber 1, and conduct the test after maintaining the temperature according to the test plan. Adjust the position of the original gauge length of the video extensometer 6 in the field of view, set the rate according to the test standard, and start the experiment. After the test, stop heating, and wait for the temperature inside the environment chamber 1 to drop to a suitable temperature. The experimenter wears high-temperature resistant gloves to disassemble the sample. After cooling to room temperature, the sample is tightly spliced ​​together, and the gauge length and diameter after fracture are measured to obtain the elongation at fracture and the reduction of area. The test process is then completed.

[0040] When adjusting the video extensometer 6, the movable block 13 moves on the surface of the screw 15 by rotating the rocker plate at the bottom of the screw 15, and the guide sleeve moves along the guide rod 14, thereby adjusting the upper and lower parts of the movable block 13. At the same time, by moving the movable arm 16 and rotating the position of the video extensometer 6, the left and right adjustment of the video extensometer 6 can be achieved, which is convenient for alignment with the quartz glass 2. In addition, a slider 18 is set to slide in the slide plate 17, which can adjust the distance between the video extensometer 6 and the quartz glass 2, so as to achieve the purpose of flexible adjustment.

[0041] In addition, the video extensometer 6 in this application is model VE-150-JG. A similar video extensometer is also disclosed in the patent application with publication number CN218178816U. The environmental chamber 1 is also disclosed in publication number CN220610463U. All of these belong to the prior art, so they will not be described in detail.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A non-contact testing device for high-temperature performance of wires, comprising an environmental chamber (1) and a mounting rod (3), wherein the mounting rod (3) is disposed at the front of the door of the environmental chamber (1), characterized in that, The environmental chamber (1) has a quartz glass (2) embedded in the center of the door. Two fixing brackets (4) are installed on the outside of the mounting rod (3). An adjustable adjustment bracket (5) is connected between the two fixing brackets (4). A video extensometer (6) and a green light source (7) are installed on the adjustment bracket (5). The green light source (7) is located on the front side of the video extensometer (6). The upper and lower positions of the environment box (1) are respectively connected by sleeves to the upper chuck (8) and the lower chuck (9). The upper chuck (8) and the lower chuck (9) are symmetrically arranged, and the upper chuck (8) and the lower chuck (9) are both provided with a conical cavity (10). Two wedge blocks (11) are symmetrically embedded in the conical cavity (10), and a middle groove (12) is provided at the center line of the opposite side of the two wedge blocks (11).

2. The testing device for non-contact testing of the high-temperature performance of wires according to claim 1, characterized in that: The upper clamp (8) and the lower clamp (9) are both fitted with limit plates on both sides of the front part by fixing bolts.

3. The testing device for non-contact testing of the high-temperature performance of wires according to claim 1, characterized in that: The intermediate groove (12) is set in a 1 / 3 circumferential arc shape.

4. The testing device for non-contact testing of the high-temperature performance of wires according to claim 1, characterized in that: The adjusting frame (5) includes a movable block (13). A screw (15) and two guide rods (14) are provided inside the movable block (13) through the side of the two fixed frames (4). The movable block (13) is provided with a guide sleeve and a threaded sleeve that are adapted to the guide rods (14) and the screw (15) respectively. The movable block (13) is connected to a movable arm (16) through a rotating shaft. The end of the movable arm (16) is fixedly connected to a slide plate (17). The top inner side of the slide plate (17) is slidably connected to a slider (18). The top of the slider (18) is fixedly connected to a connecting seat (19).

5. The testing device for non-contact testing of the high-temperature performance of wires according to claim 4, characterized in that: The bottom of the video extensometer (6) is movably connected to the connecting seat (19) via a damping shaft.

6. The testing apparatus for non-contact testing of the high-temperature performance of wires according to claim 5, characterized in that: The video extensometer (6) is facing the quartz glass (2), and the green light source (7) is fixedly installed at the end of the slide plate (17) near the side.

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