Sample clamping tool for oxyacetylene ablation test
By designing an oxyacetylene ablation test clamping tool including a sealed cooling water chamber and an elastic sample contact plug, the problem of unstable clamping and difficult to control the ablation distance in the prior art is solved, and stable clamping and convenient test sample removal under high temperature and high density flame flow conditions are achieved.
Patent Information
- Application Number
- CN202422172097.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-09-05
AI Technical Summary
The existing oxyacetylene ablation test clamping device cannot work for a long time under high temperature and high density flame flow conditions, resulting in unstable clamping of test samples, difficult to control the ablation distance, and difficult to remove the test samples, which damages the ablation surface.
A test sample clamping tool including a cooling water chamber with a sealed structure and an elastic sample contact plug was designed. Reliable clamping of irregular thin plate samples is achieved through a lateral screw and a trapezoidal slide structure, avoiding flame erosion and carbon deposits and oil accumulation problems of the flange structure.
It realizes stable clamping under high temperature and high density flame flow conditions, ensures the control consistency of ablation distance, facilitates the removal of test samples, and avoids damage to ablation surface.
Smart Images
Figure CN223000462U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a clamping tooling for oxygen-acetylene ablation test samples, which is used for oxygen-acetylene ablation tests and belongs to the technical field of ablation-resistant material testing. Background Technique
[0002] Oxygen-acetylene ablation test is a technical means to evaluate the ablation performance of thermal protection and ablation-resistant materials by simulating extreme service conditions with an oxygen-acetylene flame flow, and it is widely used in the fields of aerospace and national defense. In the current test standard, it is required that the oxygen-acetylene flame flow is vertically applied to the test surface of the specimen after spraying 10 mm. Since the flame flow temperature in the oxygen-acetylene ablation test can reach above 3000 °C and the heat flux density exceeds 4 MW / m 2 , conventional materials cannot work for a long time under such conditions, which puts forward high technical requirements for the clamping device of test samples.
[0003] At present, during the oxygen-acetylene ablation test, the clamping of samples is generally achieved by a clamping device with cooling water. The existing clamping devices mainly have two types: front-end limiting and rear-end limiting of test samples.
[0004] When the front-end of the test sample is limited, the protruding flange of the clamping device is easily cracked due to long-term flame erosion, carbon and oil are easily accumulated in the test cavity structure, and the ablation surface is easily damaged when the test sample is disassembled.
[0005] When the rear-end of the test sample is limited, the difference in the thickness of the sample during continuous testing will cause the ablation distance to be uncontrollable. The same problem of flame erosion of the clamping device exists for too thin test samples, and it is difficult to take out the test sample from the test cavity structure.
[0006] In addition, many ablation-resistant coatings need to be applied on thin plates and flakes for ablation tests. For such test samples, most of the existing clamping devices cannot provide a convenient and reliable clamping method. Summary of the Invention
[0007] The purpose of the utility model is to provide a clamping tooling for test samples used in oxygen-acetylene ablation tests to solve the problems raised in the above background technique.
[0008] An oxygen-acetylene ablation test sample clamping tooling, comprising: a cooling water cavity with a sealed structure, a test cavity is opened at the central position in the horizontal direction of the cooling water cavity, one end of the test cavity close to the ablation gun is an open structure, and one end of the test cavity far from the ablation gun is a closed surface; an elastic sample contact plug is arranged inside the test cavity, a lateral screw rod mounting hole in the vertical direction is arranged at one end of the cooling water cavity close to the ablation gun, the bottom end of the lateral screw rod mounting hole communicates with the test cavity, and a fastening nut is arranged at the position corresponding to the top end of the lateral screw rod mounting hole on the upper surface of the cooling water cavity. The lateral screw rod is rotationally installed in the lateral screw rod mounting hole through the fastening nut; trapezoidal chutes are respectively opened on the left and right sides and the lower side of the cooling water cavity close to the ablation gun side, the directions of the three trapezoidal chutes are set concentrically, the outer ends of the three trapezoidal chutes penetrate through the edge of the cooling water cavity, the movable buckle includes a sliding plate with a flat plate structure, the sliding plate is slidably installed in the trapezoidal chute, an inclined clamping plate is integrally formed at one end of the sliding plate close to the concentric center, the end of the clamping plate close to the concentric center is higher than the end far from the concentric center, a boss is integrally formed at the end of the sliding plate far from the concentric center, and a vertical internal thread hole is opened at the center position of the boss. The fixing bolt is rotationally installed in the internal thread hole.
[0009] Preferably, the sample contact plug includes an integrally formed movable rod with a hollow structure and a circular contact plate at the end of the movable rod. The circular contact plate is close to the ablation gun. A limit boss is integrally formed at the end of the movable rod far from the circular contact plate. The spring is placed in the hollow structure inside the movable rod; a clamping ring is fixedly arranged in the middle section inside the test cavity. The middle section of the movable rod passes through the center of the clamping ring. The circular contact plates and the limit bosses at both ends of the movable rod are respectively located on both sides of the clamping ring. There is a gap between the outer periphery of the middle section of the movable rod and the inner periphery of the clamping ring. The inner diameter of the clamping ring is smaller than the outer diameters of the circular contact plate and the limit boss.
[0010] Preferably, a fire baffle is fixedly arranged on the side of the lateral screw rod close to the ablation gun.
[0011] Preferably, the lower end and the upper end of the cooling water cavity are respectively sealed and communicated with a water inlet pipe and a water outlet pipe.
[0012] The beneficial effects achieved by the present utility model are as follows:
[0013] The sample contact plug is of an elastic structure. After loading the test sample until the ablation surface is flush, it is clamped from the side. The clamping tooling has no flange structure. During the test, the flame will not erode the flange and cause cracking of the cooling water cavity. Regardless of the thickness of the test sample, the ablation distance can always meet the requirements; without the protruding flange, there will be no carbon deposition and oil accumulation, ensuring reliable assembly of the test sample in place; after the test is completed, loosen the lateral screw rod, and the sample contact plug will automatically eject the test specimen from the rear end under the elastic force. The test sample is convenient to take out and will not damage the ablation surface;
[0014] The front wall of the cooling water chamber is provided with a trapezoidal chute and a movable buckle that cooperate with each other, which can realize reliable clamping of irregular thin plate test samples. Brief Description of the Drawings
[0015] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:
[0016] Figure 1 is a schematic structural diagram of a front-end limit clamping tool for samples in the prior art;
[0017] Figure 2 is a schematic structural diagram of a rear-end limit clamping tool for samples in the prior art;
[0018] Figure 3 is a perspective view of the test sample clamping tool according to an embodiment of the present invention;
[0019] Figure 4 is Figure 3 a vertical middle sectional view of
[0020] Figure 5 is Figure 3 a front view of
[0021] Figure 6 is Figure 3 a left view of
[0022] Among them, 1. Cooling water chamber, 2. Water inlet pipe, 3. Water outlet pipe, 4. Test chamber, 5. Snap ring, 6. Sample contact plug, 7. Spring, 8. Lateral lead screw, 9. Fire baffle, 10. Trapezoidal chute, 11. Fixed bolt, 12. Movable buckle, 13 is an ablation gun, 14 is a clamping device one, 15 is a flange, 16 is a top block, 17 is a test sample, 18 is a convex structure, 19 is a clamping device two. Detailed Embodiments
[0023] The following will describe in detail the technical solutions in the embodiments of the present invention with reference to the drawings.
[0024] In the prior art, the ablation gun 13, the clamping device one 14, and the clamping device two 19 all need to be fixedly installed in the laboratory, and the positions of the ablation gun 13, the clamping device one 14, and the clamping device two 19 are not convenient to move.
[0025] Such as Figure 1As shown, the front end limit means that the front end of the test cavity structure of the existing clamping device 14 is provided with a protruding flange 15, and the test sample 17 is placed from the rear end into the test cavity structure located at the center of the clamping device 14, and then the top block 16 with a spring is used from the rear end to support the test sample 17 until the edge of the ablation surface on the front side of the test sample 17 is pressed tightly with the flange 15. In this way, the test sample 17 is firmly clamped by combining the protruding flange 15 and the top block 16, so that the front end position of the ablation surface of the test sample 17 is fixed, which has the advantage that even if the thickness of the test sample 17 is different, the test sample 17 can be firmly clamped. The size changes and the ablation distance can be maintained at about 10 mm. However, the protruding flange 15 is easily cracked by flame erosion for a long time, which leads to leakage of cooling water in the clamping device 14. Carbon and oil accumulation are easy to occur on the rear side of the flange 15 in the test cavity structure and are not easy to clean. As a result, the test sample 17 is prone to improper assembly after a period of use. When taking out the test sample 17 after the test, it is necessary to use a tool to press against the ablation surface of the test sample 17 and then push the test sample 17 out of the test cavity structure, which is easy to damage the ablation surface of the test sample 17 and affect the evaluation of the ablation result.
[0026] like Figure 2 As shown, the rear end limit means that a boss structure 18 is provided in the test cavity structure of the existing clamping device 2 19, and the test sample 17 is placed in the test cavity structure from the front end. After the rear end side edge of the test sample 17 abuts against the boss structure 18, the test sample 17 is fixed from the side using the lateral screw 8, so that the rear end position of the test sample 17 is fixed. The characteristic is that the clamping device 2 19 has a simple structure and is easy to process, but the distance between the ablation surface of the test samples 17 of different thicknesses and the ablation gun 13 will be inconsistent, affecting the ablation effect. In addition, for the test samples 17 that are too thin, there is also the problem of flame erosion of the clamping device 2 19, and it is difficult to remove the test sample 17 after the test.
[0027] like Figures 3-6 (the ablation gun 13 is not shown in the figure), the embodiment of the utility model provides a new oxyacetylene ablation test sample clamping tool, including: a cooling water chamber 1 of a sealed structure, the cooling water chamber 1 is a cylindrical structure with closed ends as a whole, and a water inlet hole and a water outlet hole are respectively provided at the lower end and the upper end of the cooling water chamber 1, and the cooling water chamber 1 is sealed and connected with the water inlet pipe 2 and the water outlet pipe 3 through the water inlet hole and the water outlet hole. A test chamber 4 is provided at the center position in the horizontal direction of the cooling water chamber 1, and the diameter of the test chamber 4 is 30mm, and the diameter of the test chamber 4 matches the size of the test sample 17 of standard size. The end of the test chamber 4 close to the ablation gun 13 is an open structure, and the end of the test chamber 4 away from the ablation gun 13 is a closed surface. A clamping ring 5 is fixedly arranged in the middle section of the interior of the test chamber 4, and the front side of the clamping ring 5 close to the ablation gun 13 is about 15mm away from the ablation end face of the ablation gun 13, so as to be compatible with the testing requirements of the thicker test sample 17.
[0028] The sample contact plug 6 includes a movable rod with an integrally formed hollow structure and a circular contact plate located at the end of the movable rod. The circular contact plate is close to the ablation gun 13. A limiting boss is integrally formed at one end of the movable rod away from the circular contact plate. The spring 7 is in the hollow structure inside the movable rod. In the free state, one end abuts against the center position of the closed surface of the test chamber 4, and the other end pushes the circular contact plate of the sample contact plug 6 to a position flush with the front end face of the cooling water chamber 1. When loading the sample 17, the spring 7 is always in a compressed state. The middle section of the movable rod passes through the center of the snap ring 5. The circular contact plates and the limiting bosses at both ends of the movable rod are respectively located on both sides of the snap ring 5. There is a certain gap between the outer circumference of the middle section of the movable rod and the inner circumference of the snap ring 5 to ensure that the movable rod can move smoothly horizontally in the snap ring 5. The inner diameter of the snap ring 5 is slightly smaller than the outer diameters of the circular contact plate and the limiting boss. The snap ring 5 plays a role in limiting the circular contact plate to prevent the sample contact plug 6 from exceeding the limit when moving horizontally; at the same time, the snap ring 5 can prevent the sample contact plug 6 from falling off from the front end.
[0029] One end of the cooling water chamber 1 close to the ablation gun 13 is integrally formed with a lateral screw rod mounting hole in the vertical direction. The bottom end of the lateral screw rod mounting hole communicates with the test chamber 4. A fastening nut is fixedly arranged at a position corresponding to the top end of the lateral screw rod mounting hole. The fastening nut is welded on the upper surface of the cooling water chamber 1. The lateral screw rod 8 is screwed into the fastening nut. The rotation of the lateral screw rod 8 in the fastening nut can make the end of the lateral screw rod 8 extend into the test chamber 4. A fire baffle 9 is fixedly arranged on one side of the lateral screw rod 8 close to the ablation gun 13. The fire baffle 9 is welded on the upper surface of the cooling water chamber 1. The fire baffle 9 can prevent the flame from eroding the lateral screw rod 8.
[0030] On the left and right sides and the lower side of the cooling water chamber 1 close to the ablation gun 13, trapezoidal chutes 10 are respectively opened. The directions of the three trapezoidal chutes 10 are concentrically arranged. The outer ends of the three trapezoidal chutes 10 penetrate the edge of the cooling water chamber 1. The movable buckle 12 is slidably installed in the trapezoidal chute 10. The movable buckle 12 includes a sliding plate with a flat plate structure. The cross-sectional shape and size of the sliding plate match those of the trapezoidal chute 10. The sliding plate is inserted into the trapezoidal chute 10 from the edge of the cooling water chamber 1 to realize movement. A clamping plate is integrally formed at one end of the sliding plate close to the common center. The clamping plate has a certain inclination angle. The end of the clamping plate close to the common center is higher than the end far from the common center. A boss is integrally formed at one end of the sliding plate far from the common center. A vertical internal threaded hole is opened at the center position of the boss. The fixing bolt 11 is rotatably installed in the internal threaded hole of the boss.
[0031] The test sample clamping tooling provided by the embodiment of the present utility model mainly has the following two application scenarios:
[0032] Application 1: For the test sample 17 that conforms to the existing standard size, let the cooling water enter the cooling water chamber 1 from the water inlet pipe 2, and discharge from the water outlet pipe 3 after passing through the cooling water chamber 1. Load the test sample 17 into the test chamber 4 from the front end. The ablation surface of the test sample 17 faces outward and is close to the ablation gun 13. The test sample 17 realizes position adjustment by pressing the sample contact plug 6 and the spring 7 inside the sample contact plug 6. After the ablation surface of the test sample 17 is flush with the front end surface of the cooling water chamber 1, tighten the lateral screw rod 8 to clamp the test sample 17 from the side, and then start the ablation test. During the test, the fire baffle 9 can protect the lateral screw rod 8 from being eroded by the flame flow. After the test is over, loosen the lateral screw rod 8, and the spring 7 pushes the test sample 17 out of the test chamber 4 through the sample contact plug 6 to complete the test, and the sample contact plug 6 is blocked by the snap ring 5 and will not fall off.
[0033] Application 2: For the coated thin plate or thin sheet sample with irregular shape, let the cooling water enter from the water inlet pipe 2, and discharge from the water outlet pipe 3 after passing through the cooling water chamber 1. Adjust the three movable buckles 12 on the trapezoidal chute 10 inward to a suitable position so that the coated thin plate or thin sheet sample can be smoothly clamped, and then tighten the fixing bolts 11 on the movable buckles 12 to fix the positions of the movable buckles 12, that is, fix the position of the coated thin plate or thin sheet sample, and then start the ablation test. After the test is over, loosen the fixing bolts 11 and adjust the positions of the movable buckles 12 outward to take out the coated thin plate or thin sheet sample.
[0034] In the embodiments of the present utility model, the technical features not described in detail are all existing technologies or conventional technical means, and will not be elaborated here.
[0035] Finally, it should be noted that: the above embodiments are only specific implementation manners of the present utility model, used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that: any person skilled in the art within the technical scope disclosed by the present utility model can modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model.
Claims
1. An oxyacetylene ablation test sample clamping tool, characterized in that: include: A cooling water chamber with a sealed structure, a test chamber is provided at the center position of the cooling water chamber in the horizontal direction, the end of the test chamber close to the ablation gun is an open structure, and the end of the test chamber away from the ablation gun is a closed surface; a sample contact plug with an elastic structure is arranged inside the test chamber, a lateral screw rod mounting hole in the vertical direction is arranged at the end of the cooling water chamber close to the ablation gun, the bottom end of the lateral screw rod mounting hole is connected with the test chamber, a fastening nut is arranged at a position corresponding to the top end of the lateral screw rod mounting hole on the upper surface of the cooling water chamber, and the lateral screw rod is rotatably installed in the lateral screw rod mounting hole through the fastening nut; the cooling water chamber close to the ablation gun is an open structure, and the end of the test chamber away from the ablation gun is a closed surface; a sample contact plug with an elastic structure is arranged inside the test chamber, a lateral screw rod mounting hole in the vertical direction is arranged at the end of the cooling water chamber close to the ablation gun, the bottom end of the lateral screw rod mounting hole is connected with the test chamber, a fastening nut is arranged at a position corresponding to the top end of the lateral screw rod mounting hole on the upper surface of the cooling water chamber, and the lateral screw rod is rotatably installed in the lateral screw rod mounting hole through the fastening nut; Trapezoidal slide grooves are respectively provided on the left and right sides and the lower side of one side of the gun, and the directions of the three trapezoidal slide grooves are arranged cocentrically, and the outer ends of the three trapezoidal slide grooves pass through the edge of the cooling water chamber, and the movable buckle includes a sliding plate of a flat structure, and the sliding plate is slidably installed in the trapezoidal slide groove, and an inclined clamping plate is integrally formed at one end of the sliding plate close to the cocenter, and the end of the clamping plate close to the cocenter is higher than the end away from the cocenter, and a boss is integrally formed at the end of the sliding plate away from the cocenter, and a vertical internal threaded hole is provided at the center of the boss, and a fixing bolt is rotatably installed in the internal threaded hole.
2. The oxyacetylene ablation test sample clamping tool according to claim 1, characterized in that: The sample contact plug includes a movable rod with an integrally formed hollow structure and a circular contact plate located at the end of the movable rod, the circular contact plate is close to the ablation gun, and a limiting boss is integrally formed at one end of the movable rod away from the circular contact plate, and a spring is placed in the hollow structure inside the movable rod; a clamping ring is fixedly provided in the middle section inside the test chamber, the middle section of the movable rod passes through the center of the clamping ring, the circular contact plates and the limiting bosses at both ends of the movable rod are respectively located on both sides of the clamping ring, a gap is left between the outer periphery of the middle section of the movable rod and the inner periphery of the clamping ring, and the inner diameter of the clamping ring is smaller than the outer diameters of the circular contact plate and the limiting boss.
3. The oxyacetylene ablation test sample clamping tool according to claim 1, characterized in that: A fire baffle is fixedly arranged on one side of the lateral screw rod close to the ablation gun.
4. The oxyacetylene ablation test sample clamping tool according to claim 1, characterized in that: The lower end and the upper end of the cooling water chamber are respectively connected with the water inlet pipe and the water outlet pipe in a sealed manner.