Ice structure underwater impact test fixture and method of assembly thereof

Abstract

The application discloses an underwater ice structure impact test clamp and an assembling method thereof, and the clamp comprises an impact wave propagation pipeline, a rotary locking sealing structure for connecting a cylinder clamp, limiting balls and an annular vibration-proof sealing ring. The cylinder clamp and the rotary locking sealing structure are provided with multiple annular vibration-proof sealing rings, the rotary locking sealing structure is provided with a displacement limiter and an ice structure impact deformation observation hole, and the locking structure is provided with a limiting device for limiting and aligning the cylindrical impact pipeline installed thereon. The clamp is simple to operate, tightly clamped and reliably sealed, and to a certain extent, prevents the situation of clamping damage to the test piece and leakage of the liquid in the impact pipeline. The application solves the situation of test piece slippage during the experimental clamping of the ice structure, guarantees the personal safety of researchers during the experiment, and has the advantages of simple structure, low development cost and strong applicability, and can meet the underwater impact test method of different ice structures.

Description

TECHNICAL FIELD

[0001] The present application relates to a test fixture, in particular to an underwater ice structure impact test fixture and its assembly method. BACKGROUND

[0002] In polar ocean engineering research, the ice structure in the ocean is usually broken. The two common polar ice breaking methods are ice breaking ship ice breaking and blasting ice breaking. The violent ice breaking method of the ice breaking ship not only has low ice breaking efficiency, but also causes great damage to the structure of the ship itself. Considering the strength difference of the ice structure in different regions, different seasons and different temperatures, especially the polar ice structure in harsh environments, the ice breaking capacity of the ice breaking ship is limited and cannot achieve the ideal ice breaking effect. Blasting ice breaking is an important research field in ice breaking engineering, but the key technical parameters of blasting ice breaking, such as the relationship between the amount of explosive and the ice breaking volume, are still difficult to grasp. Therefore, the dynamic mechanical property research of the ice structure is particularly important.

[0003] At present, the research on the strength of the ice structure mainly focuses on the quasi-static category, and the performance of the ice structure under high strain rate is less studied. However, in actual engineering, ice breaking and ice body breaking problems exceed the quasi-strain rate category. The underwater blasting test of the ice structure in the laboratory can greatly promote the improvement of the polar ice breaking level. In the process of underwater impact loading test of the ice structure, it is necessary to keep the ice structure in a fixed state to avoid the slippage caused by the melting of the ice structure due to water infiltration, which is another key to improve the test accuracy. However, at present, it is mainly in the theoretical category, and how to realize it is a problem to be solved. SUMMARY

[0004] The purpose of the present application is to provide an underwater ice structure impact test fixture, which can effectively realize underwater impact loading of the ice structure in the laboratory, optimize the structure, reduce the cost, and realize repeated use. And its assembly method is provided.

[0005] Technical scheme: An underwater ice structure impact test fixture, the test fixture is connected with an impact wave generating device for generating impact waves, the test fixture comprises a cylinder fixture, the first end of the cylinder fixture is integrally connected with an impact wave propagation pipeline, the interiors of the two constitute a continuous channel with a circular cross section, the distal end of the cylinder fixture is sealingly connected with a rotary locking sealing structure, the circumferential direction of the input port of the impact wave propagation pipeline is provided with an outwardly protruding fixture first end annular boss ring, and the fixture first end annular boss ring is sealingly connected with the impact wave generating device through a first end fixed locking structure.

[0006] Further, the rotary locking sealing structure comprises a structure body which is a circular plate structure, a ice structure impact deformation observation hole is formed in the center of the structure body, at least two locking buckles are uniformly distributed on the circumferential side surface of the structure body, the locking buckle is a folded edge structure which is folded towards the center of the structure body, a plurality of annular vibration blocking sealing rings are arranged between the locking buckle and the side surface of the structure body, and one limiting ball is arranged on each locking buckle.

[0007] Preferably, the limiting ball comprises a universal ball, an outer barrel, a compression spring, a small ball and a support plate, the compression spring and the support plate are arranged in the inner part of the outer barrel, one end of the compression spring is connected with the inner bottom wall of the outer barrel, the other end is connected with the lower part of the support plate, the cross section of the support plate is U-shaped, the universal ball is arranged in the support plate, a plurality of small balls are arranged between the universal ball and the inner bottom surface of the support plate, and the outer bottom surface of the outer barrel is connected with the locking buckle.

[0008] Preferably, the circumferential side surface of the end of the barrel clamp is provided with an inner recessed clamp end annular boss ring, the clamp end annular boss ring is fixed with an end fixed locking structure, the end fixed locking structure is provided with a limiting ball groove corresponding to the limiting ball, the end fixed locking structure is connected with the structure body through the locking buckle, and the limiting ball (8-3) is clamped in the corresponding limiting ball groove.

[0009] Further, the clamp further comprises an inner wall sealing element, and the inner wall sealing element is at least one and is embedded on the inner circumferential surface of the clamp head end annular boss ring.

[0010] Preferably, the inner wall sealing element is an annular symmetric vibration blocking sealing ring, a sealing protrusion one is arranged on the both sides of the main body, and a sealing groove one is arranged on the circumferential surface between the inner diameter and the outer diameter.

[0011] Further, the clamp further comprises a port sealing element, and the clamp head end annular boss ring and the connecting surface between the head end fixed locking structure are embedded with at least one port sealing element.

[0012] Preferably, the port sealing element is an annular one-side vibration blocking sealing ring, a sealing protrusion two is arranged on one side of the annular one-side vibration blocking sealing ring, and a sealing groove two is arranged on the side surface, and the sealing protrusion two faces the barrel clamp.

[0013] Further, the shock wave propagation pipeline is an integral two-section structure, the outer contour of the section close to the shock wave generating device is cylindrical, the outer contour of the section close to the barrel clamp is circular truncated cone, the inner diameter of the section close to the shock wave generating device of the shock wave propagation pipeline is smaller than the inner diameter of the section close to the barrel clamp.

[0014] An assembly method of the ice structure underwater impact test clamp is provided, and the assembly method comprises the following steps:

[0015] Step one: seal the front end of the shock wave propagation pipeline and connect it to the shock wave generating device through the fixed locking structure;

[0016] Step two: assemble the rotary locking sealing structure and lubricate it;

[0017] Step three: push the test piece into the inside of the cylinder clamp tail end, so that it reaches the sealed position of the shock wave propagation pipeline;

[0018] Step four: install the rotary locking sealing structure on the tail end of the cylinder clamp;

[0019] Step five: after the overall installation is completed, check the pipeline connection, and then carry out the impact test.

[0020] Advantages: compared with the prior art, the advantages of the present application are:

[0021] (1) The device of the present application has simple structure, convenient installation, reusability and high safety.

[0022] (2) The present application prevents the test piece from being damaged and the liquid in the impact pipeline from leaking to a certain extent.

[0023] (3) The impact generated by the present application is in the pipeline, which avoids the high-speed scattering of ice structure damage to the surrounding, causing safety hazards to the experimenters.

[0024] (4) The present application adopts an annular sealing structure, which avoids the sliding of the ice structure during the test process, ensuring the accuracy of the experimental results.

[0025] (5) The present application sets an ice structure impact deformation observation hole on the basis of ensuring the safety of the experiment, which can observe the structural changes in the test piece during the damage process, so as to observe the damage forms of different test pieces. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is the front view of the present application;

[0027] Fig. 2 is a structure schematic diagram of the present application in use;

[0028] Fig. 3 is a structure schematic diagram of the rotary locking sealing structure;

[0029] Fig. 4 is a structure schematic diagram of the limiting ball;

[0030] Fig. 5 is a structure schematic diagram of the inner wall sealing element;

[0031] Fig. 6 is a structure schematic diagram of the port sealing element. DETAILED DESCRIPTION

[0032] The present application is further illustrated in conjunction with the accompanying drawings and specific examples, which should be understood as merely illustrative of the present application and not limiting the scope of the present application.

[0033] An ice structure underwater impact test fixture, as shown in Figs. 1-6 The test fixture is connected with a shock wave generating device 9 emitting shock waves, which can be a shock tube.

[0034] The test fixture includes a cylinder fixture 1, the first end of which is integrally connected with a shock wave propagation pipeline 4, both of which form a continuous channel with a circular cross section inside. The shock wave propagation pipeline 4 is a two-section structure integrally formed, the outer contour of one section is cylindrical, and the outer contour of the other section is a circular truncated cone. The end port of the cylindrical section is provided with an outwardly convex fixture first end annular boss ring 2 in the circumferential direction, and the fixture first end annular boss ring 2 is sealingly connected with the shock wave generating device 9 through a first end fixed locking structure 3. The two-section structure design forms an equal-wall gradual change in diameter structure, so that the inlet end inner diameter of the shock wave propagation pipeline 4 is equal to the pipeline inner diameter of the shock wave generating device 9, and the outlet inner diameter is greater than the pipeline inner diameter of the shock wave generating device 9 and equal to the inner diameter of the cylinder fixture 1.

[0035] At least one inner wall sealing element 2-1 is embedded on the inner circumferential surface of the fixture first end annular boss ring 2, and at least one port sealing element 2-2 is embedded between the connecting surface of the fixture first end annular boss ring 2 and the first end fixed locking structure 3, so that a sealing connection is formed between the test fixture and the shock wave generating device 9 emitting shock waves. The inner wall sealing element 2-1 is a ring-symmetric vibration-blocking sealing ring, both sides of the main body are provided with sealing protrusions one 2-1-1, and sealing grooves one 2-1-2 are formed on the circumferential surface between the inner and outer diameters, which ensures secondary sealing of the pipeline interior without sliding of the test piece. The port sealing element 2-2 is a ring-single-side vibration-blocking sealing ring, one side of which is provided with sealing protrusions two 2-2-1, and sealing grooves two 2-2-2 are formed on the side surface, and the sealing protrusions two 2-2-1 face the cylinder fixture 1, which ensures multi-layer sealing during connection and prevents liquid leakage from the cylinder fixture 1.

[0036] The end of the cylinder clamp 1 is sealingly connected with a rotary locking sealing structure 8, which includes a structure body 8-1 for three times sealing of the structure, to ensure the air tightness of the end structure. The structure body 8-1 is a circular plate structure, and an ice structure impact deformation observation hole 8-2 is formed in the center thereof. The ice structure impact deformation observation hole 8-2 provides a window for observing the failure mode while limiting the freedom of the test piece. At least two locking buckles 8-4 are uniformly distributed on one side of the ice structure impact deformation observation hole 8-2 in the circumferential direction. The locking buckle 8-4 is a flange structure folded towards the center of the structure body 8-1. A plurality of annular vibration isolation sealing rings 8-5 are arranged between the locking buckle 8-4 and the side of the structure body 8-1, to limit the freedom of the inner test piece and play a sealing and leakage prevention role. A limiting ball 8-3 is arranged on each locking buckle 8-4, to lock and align the sealing structure.

[0037] The limiting ball 8-3 includes a universal ball 8-3-1, an outer barrel 8-3-2, a compression spring 8-3-3, a small ball 8-3-4 and a support plate 8-3-5. The compression spring 8-3-3 and the support plate 8-3-5 are arranged inside the outer barrel 8-3-2. One end of the compression spring 8-3-3 is connected with the inner bottom wall of the outer barrel 8-3-2, and the other end is connected with the lower part of the support plate 8-3-5. The support plate 8-3-5 is U-shaped in cross section. The universal ball 8-3-1 is arranged in the support plate 8-3-5. A plurality of small balls 8-3-4 are arranged between the universal ball 8-3-1 and the inner bottom surface of the support plate 8-3-5. The outer bottom surface of the outer barrel 8-3-2 is connected with the locking buckle 8-4.

[0038] The structure of the first end fixed locking structure 3 can adopt a structure similar to that of the rotary locking sealing structure 8. The difference lies in that the ice structure impact deformation observation hole 8-2 is not arranged, so that the entire structure body is a circular ring and the inner diameter is consistent with the inner diameter of the shock wave generating device 9. The connection mode of the ball and the groove is also adopted. The ball is arranged on the first end fixed locking structure 3, and the groove is arranged on the shock wave generating device 9.

[0039] The end of the cylinder clamp 1 is provided with an inner recessed clamp end annular boss ring 5 in the circumferential direction. The clamp end annular boss ring 5 is fixed with an end fixed locking structure 7. The end fixed locking structure 7 is provided with a limiting ball groove 6 corresponding to the limiting ball 8-3. The end fixed locking structure 7 is connected with the structure body 8-1 through the locking buckle 8-4, and the limiting ball 8-3 is arranged in the corresponding limiting ball groove 6.

[0040] The clamp can be used for underwater dynamic test experiment of ice structure, to study the mechanical properties of the ice structure under high strain rate. The assembly method of the ice structure underwater impact test clamp includes the following steps:

[0041] Step one: install the inner wall sealing piece. Install the inner wall sealing piece into the clamping fixture first end annular boss ring of the cylinder body, press tightly, and ensure that the groove inside it clamps the inner wall sealing piece. Then install the front end sealing piece to the end face of the clamping fixture first end annular boss ring, press tightly, and ensure that the groove on it clamps the front end sealing piece.

[0042] Step two: install the limiting ball. Uniformly apply an oil film to the universal ball of the limiting ball, then place it in the installation groove provided on the locking buckle, so that the outer barrel body upper edge of the limiting ball is flush with the locking buckle.

[0043] Step three: connect the clamping fixture main body to the shock wave generating device through the first end fixed locking structure.

[0044] Step four: push the test piece from the end of the cylinder body clamp into the clamp, so that it is tightly fastened with the inner wall sealing piece.

[0045] Step five: install the annular vibration blocking sealing ring in the rotating locking sealing structure, then install the rotating locking sealing structure at the end of the cylinder body clamp. The rotating locking buckle clamps the edge of the end fixed locking structure, until the limiting ball is aligned with the limiting ball groove. Under the action of the compression spring, the limiting ball is clamped in the limiting ball groove, and the rotating locking sealing structure is installed in place.

[0046] Step six: after the overall installation is completed, check the pipeline connection, and then conduct the impact test.

[0047] The shock wave generating device generates a shock wave, which is transmitted to the test piece in the pipeline through the propagation pipeline. The test piece is damaged and deformed under the action of the shock wave. The pipeline design can seal the test piece in all directions, limit its degrees of freedom, ensure the air tightness of the shock pipeline, and the multi-layer protection of the rotating locking structure can avoid structural damage and scattering. The full-enclosure design can avoid the scattering of test piece fragments and injury to experimental personnel. At the same time, the tail ice structure impact deformation observation hole can observe the damage effect, and the multi-layer sealing structure limits the sliding of the test piece, ensuring the safety and accuracy of the experiment.

Claims

1. An ice structure underwater impact test fixture, the test fixture being connected with a shock wave generator (9) that emits a shock wave, characterized in that: The test fixture comprises a cylinder fixture (1), the leading end of the cylinder fixture (1) is integrally connected with a shock wave propagation pipeline (4), the interiors of both constitute a continuous channel with a circular cross section, the trailing end of the cylinder fixture (1) is sealingly connected with a rotary locking sealing structure (8), the circumferential direction of the input port of the shock wave propagation pipeline (4) is provided with an outwardly convex fixture leading end annular boss ring (2), the fixture leading end annular boss ring (2) is sealingly connected with a shock wave generating device (9) through a leading end fixed locking structure (3); The rotary locking sealing structure (8) comprises a structure body (8-1), the structure body (8-1) is a circular plate-shaped structure, a central shock deformation observation hole (8-2) is formed in the center of the structure body (8-1), and at least two locking buckles (8-4) are uniformly distributed in the circumferential direction on one side surface of the structure body (8-1); the locking buckle (8-4) is a folded edge structure that is folded towards the center of the structure body (8-1); a plurality of annular vibration-resistant sealing rings (8-5) are arranged between the locking buckle (8-4) and the side surface of the structure body (8-1); and one limiting ball (8-3) is arranged on each locking buckle (8-4). The limiting ball (8-3) comprises a universal ball (8-3-1), an outer barrel (8-3-2), a compression spring (8-3-3), a small ball (8-3-4) and a support plate (8-3-5); the compression spring (8-3-3) and the support plate (8-3-5) are arranged inside the outer barrel (8-3-2); one end of the compression spring (8-3-3) is connected with the inner bottom wall of the outer barrel (8-3-2), and the other end is connected with the lower part of the support plate (8-3-5); the support plate (8-3-5) is U-shaped in cross section; the universal ball (8-3-1) is arranged in the support plate (8-3-5); a plurality of small balls (8-3-4) are arranged between the universal ball (8-3-1) and the inner bottom surface of the support plate (8-3-5); and the outer bottom surface of the outer barrel (8-3-2) is connected with the locking buckle (8-4).

2. An ice structure underwater impact test fixture according to claim 1, characterized in that: The circumferential direction of the trailing end of the cylinder fixture (1) is provided with an inwardly recessed fixture trailing end annular boss ring (5), the fixture trailing end annular boss ring (5) is fixed with a trailing end fixed locking structure (7), the trailing end fixed locking structure (7) is provided with a limiting ball groove (6) corresponding to the limiting ball (8-3), the trailing end fixed locking structure (7) is connected with the structure body (8-1) through the locking buckle (8-4), and the limiting ball (8-3) is clamped in the corresponding limiting ball groove (6).

3. An ice structure underwater impact test fixture as claimed in claim 1, wherein: The circumferential direction of the trailing end of the cylinder fixture (1) is provided with an inwardly recessed fixture trailing end annular boss ring (5), the fixture trailing end annular boss ring (5) is fixed with a trailing end fixed locking structure (7), the trailing end fixed locking structure (7) is provided with a limiting ball groove (6) corresponding to the limiting ball (8-3), the trailing end fixed locking structure (7) is connected with the structure body (8-1) through the locking buckle (8-4), and the limiting ball (8-3) is clamped in the corresponding limiting ball groove (6).

4. An ice structure underwater impact test fixture according to claim 3, characterized in that: The circumferential direction of the trailing end of the cylinder fixture (1) is provided with an inwardly recessed fixture trailing end annular boss ring (5), the fixture trailing end annular boss ring (5) is fixed with a trailing end fixed locking structure (7), the trailing end fixed locking structure (7) is provided with a limiting ball groove (6) corresponding to the limiting ball (8-3), the trailing end fixed locking structure (7) is connected with the structure body (8-1) through the locking buckle (8-4), and the limiting ball (8-3) is clamped in the corresponding limiting ball groove (6).

5. An ice structure underwater impact test fixture as claimed in claim 1, wherein: ​ 6. An ice structure underwater impact test fixture according to claim 5, characterized in that: The port seal (2-2) is a ring-shaped single-side anti-vibration seal ring, one side of which is provided with a sealing protrusion two (2-2-1), and the side surface is provided with a sealing groove two (2-2-2), and the sealing protrusion two (2-2-1) faces the cylinder clamp (1).

7. An ice structure underwater impact test fixture as claimed in claim 1, wherein: The shock wave propagation pipeline (4) is an integral two-section structure, the outer contour of the section close to the shock wave generating device (9) is cylindrical, and the outer contour of the section close to the cylinder clamp (1) is a circular truncated cone, so that the inner diameter of the shock wave propagation pipeline (4) close to the shock wave generating device (9) is smaller than the inner diameter close to the cylinder clamp (1).

8. A method of assembling an ice structure underwater impact test fixture as claimed in any one of claims 1 to 7, characterised by The method comprises the following steps: Step one: seal the front end of the shock wave propagation pipeline (4), and connect it to the shock wave generating device (9) through the fixed locking structure (3); Step two: assemble the rotary locking seal structure (8) and lubricate it; Step three: push the test piece into the cylinder clamp (1) from the tail end, so that it reaches the sealed position of the shock wave propagation pipeline (4); Step four: install the rotary locking seal structure (8) on the tail end of the cylinder clamp (1); Step five: after the overall installation is completed, check the pipeline connection, and then perform the impact test.

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