High-strength steel wire winding reinforced pipe fitting and using method thereof

Abstract

The invention relates to a high-strength steel wire winding reinforced pipe fitting and a using method thereof, and belongs to the technical field of steel wire winding reinforced pipe fittings. When the high-strength steel wire winding reinforced pipe fitting is used in a fire-fighting pipeline system and high-pressure water flow impacts an inner rubber layer, a first sliding part moves in the axial direction of a guide rail and cooperates with a spring part to form first-stage buffering; the peak impact force is converted into elastic potential energy; when pressure fluctuates to trigger a limiting part, the arc-shaped outer edge of a swing rod makes contact with a stop lever to generate a lever effect, a second sliding part is forced to move reversely, rigid stress borne by an outer rubber layer is converted into flexible deformation of a middle buffer layer, and a rigidity abrupt change interface is effectively eliminated. And meanwhile, a multidirectional displacement compensation mechanism under the constraint of the guide rail is utilized, the reflectivity of high-frequency vibration energy is reduced, and the problem that a stress transmission path is interrupted due to the fact that a rigidity abrupt change interface is formed by a low-rigidity buffer layer and a high-rigidity outer rubber layer is fundamentally solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel wire wound reinforced pipe fittings, and particularly relates to a high-strength steel wire wound reinforced pipe fitting and a using method thereof. Background Art

[0002] As a new type of structural composite material, high-strength steel wire wound reinforced pipe fittings are applied in the industrial field due to their excellent mechanical properties and pressure resistance characteristics. The pipe fittings mainly consist of an inner rubber layer, a steel wire reinforcement layer, an intermediate buffer layer, and an outer rubber layer: The inner rubber layer is in direct contact with the conveyed medium and usually uses corrosion-resistant synthetic rubber or thermoplastic elastomer; The steel wire reinforcement layer uses high-strength steel wires as the skeleton and is embedded in the pipe body through spiral winding or cross-weaving processes to form a core support structure with tensile and compressive resistance; The intermediate buffer layer mostly uses silica gel or low-modulus rubber materials to absorb high-frequency vibration energy; The outer rubber layer is composed of wear-resistant polymers or woven fiber layers to undertake the external protection function. This composite structure realizes the unity of light weight and high strength through the synergistic effect of materials and processes, and is particularly suitable for engineering scenarios that need to bear complex loads.

[0003] However, when such pipe fittings are applied to the fire protection pipeline system, their performance faces severe challenges. The fire protection pipeline not only needs to withstand the continuous impact of high-pressure water flow for a long time, but also needs to cope with the instantaneous high-pressure fluctuations and high-frequency vibrations under extreme working conditions during emergency rescue. Under the action of such dynamic loads, the modulus difference problem between the intermediate buffer layer and the outer rubber layer is significantly amplified: The low-stiffness buffer layer and the high-stiffness outer rubber layer form a stiffness mutation interface, resulting in the interruption of the stress transmission path. Specifically, the impact force generated by the high-pressure fluctuation forms stress concentration at the interface, and the energy reflection caused by the high-frequency vibration results in the local stress wave superposition effect. This dual action makes the interface bonding area a weak link in the structure, easily leading to interlayer peeling, microcrack propagation, and even fatigue fracture of the steel wire layer, seriously weakening the overall strength and service life of the pipe fitting. In view of this, a high-strength steel wire wound reinforced pipe fitting and a using method thereof are proposed. Summary of the Invention

[0004] To solve the above problems existing in the prior art, the present invention provides a high-strength steel wire wound reinforced pipe fitting and a using method thereof, which solve the problem that the low-stiffness buffer layer and the high-stiffness outer rubber layer in the prior art form a stiffness mutation interface, resulting in the interruption of the stress transmission path.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A high-strength steel wire wound reinforced pipe fitting, comprising an inner rubber layer, a steel wire reinforcement layer, an intermediate buffer layer and an outer rubber layer. The inner rubber layer, the steel wire reinforcement layer, the intermediate buffer layer and the outer rubber layer are sequentially connected to form the whole pipe fitting. A stress transition device is arranged between the intermediate buffer layer and the outer rubber layer. The stress transition device includes a first sliding part, a second sliding part, a support part, a swing part rotatably arranged on the support part, a spring part and a limit part. One end of the first sliding part is fixedly arranged on the intermediate buffer layer, and one end of the second sliding part is fixedly arranged on the outer rubber layer. The support part is located in the gap between the intermediate buffer layer and the outer rubber layer, and the support part penetrates through the intermediate buffer layer and is connected to the steel wire reinforcement layer. Both ends of the swing part are respectively hinged to the first sliding part and the second sliding part. The limit part is arranged on the support part between the other end of the first sliding part and the outer rubber layer. Both ends of the spring part are respectively connected to the other end of the first sliding part and the outer rubber layer. The liquid impact force inside the whole pipe fitting drives the first sliding part to squeeze the spring part. The limit part fits with the first sliding part to drive the swing part to swing. The swing part drives the second sliding part to move towards the direction close to the intermediate buffer layer, so that the stress is continuously transmitted between the intermediate buffer layer and the outer rubber layer.

[0007] As a further scheme of the present invention, guide rails which cooperate with the first sliding part and the second sliding part are respectively arranged on the support part.

[0008] As a further scheme of the present invention, a stop rod is vertically arranged on the other end of the first sliding part, and the stop rod can be in contact with the swing part.

[0009] As a further scheme of the present invention, the swing part is a swing rod. Both ends of the swing rod are respectively hinged to the first sliding part and the second sliding part. The swing rod between the first sliding part and the second sliding part is rotatably arranged on the support part, and the outer edge of the swing rod is an arc structure, and the arc structure can be in contact with the stop rod.

[0010] As a further scheme of the present invention, the number of the stress transition devices is greater than or equal to four, and the stress transition devices are arranged at equal intervals.

[0011] As a further scheme of the present invention, the gap between the intermediate buffer layer and the outer rubber layer except for the stress transition device is filled with a closed-cell foam elastomer or a flexible polyurethane composite material.

[0012] As a further scheme of the present invention, the steel wire reinforcement layer is made of high-strength steel wire made of high-carbon steel or stainless steel.

[0013] As a further scheme of the present invention, an anti-corrosion coating is coated on the surface of the outer rubber layer.

[0014] A using method of a high-strength steel wire wound reinforced pipe fitting includes the following steps:

[0015] S1: Before installation, check the mechanical structure integrity of the pipe fittings. Confirm that the rotational freedom degree of the swinging part of the stress transition device is ≥30°, the gap between the first sliding part and the guide rail is ≤0.2 mm, and the pre-compression amount of the spring part is 10%-15% of the free length;

[0016] S2: Ensure that the circumferential stress distribution between the outer rubber layer and the intermediate buffer layer is uniform;

[0017] S3: When fluid is introduced, the internal pressure in the pipe causes the first sliding part to generate an axial displacement along the guide rail of the support part. At the same time, when the compression amount of the spring part reaches more than half of the designed stroke, the limit part is triggered;

[0018] S4: When the pressure fluctuates, the contact between the stop rod and the arc surface of the swinging rod generates a lever effect, forcing the second sliding part to move in the reverse direction along the guide rail to compensate for the displacement amount, and realizing the dynamic stress balance between the intermediate buffer layer and the outer rubber layer;

[0019] S5: During periodic maintenance, measure the residual compression stroke of the spring part. If the springback margin < half of the initial value, synchronously replace the hinge shaft of the swinging part, and detect the wear amount of the guide rail working surface for repair machining.

[0020] The beneficial effects of the present invention are as follows:

[0021] When the high-strength steel wire wound reinforced pipe fitting is used in the fire protection pipeline system, when the high-pressure water flow impacts the inner rubber layer, the axial displacement of the first sliding part along the guide rail and the spring part form the first-stage buffer, converting the peak impact force into elastic potential energy; when the pressure fluctuation triggers the limit part, the contact between the arc-shaped outer edge of the swinging rod and the stop rod generates a lever effect, forcing the second sliding part to displace in the reverse direction, converting the rigid stress borne by the outer rubber layer into the flexible deformation of the intermediate buffer layer, effectively eliminating the stiffness mutation interface. This device improves the stress transfer continuity between the intermediate buffer layer and the outer rubber layer, and at the same time uses the multi-directional displacement compensation mechanism under the constraint of the guide rail to reduce the high-frequency vibration energy reflectivity, fundamentally solving the problem that the stress transfer path is interrupted due to the formation of a stiffness mutation interface between the low-stiffness buffer layer and the high-stiffness outer rubber layer. Brief Description of the Drawings

[0022] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with the drawings.

[0023] Figure 1 is the overall structure schematic diagram of the present invention;

[0024] Figure 2 is the structure schematic diagram of the stress transition device of the present invention;

[0025] Figure 3 is the partial structure top view of the first sliding part and the second sliding part of the present invention.

[0026] Description of main component symbols:

[0027] In the figure: 1, inner rubber layer; 2, steel wire reinforcement layer; 3, intermediate buffer layer; 4, outer rubber layer; 5, stress transition device; 51, first sliding part; 52, second sliding part; 53, support part; 54, swing part; 55, spring part; 56, limiting part. Specific embodiments

[0028] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will describe in detail the specific embodiments, structures, features and their effects of the present invention in conjunction with the accompanying drawings and preferred embodiments.

[0029] Please refer to Figure 1 - Figure 3 , this embodiment provides a high-strength steel wire wound reinforced pipe fitting, including an inner rubber layer 1, a steel wire reinforcement layer 2, an intermediate buffer layer 3 and an outer rubber layer 4. The inner rubber layer 1, the steel wire reinforcement layer 2, the intermediate buffer layer 3 and the outer rubber layer 4 are sequentially connected to form the overall pipe fitting; a stress transition device 5 is arranged between the intermediate buffer layer 3 and the outer rubber layer 4. The stress transition device 5 includes a first sliding part 51, a second sliding part 52, a support part 53, a swing part 54 rotatably arranged on the support part 53, a spring part 55 and a limiting part 56. One end of the first sliding part 51 is fixedly arranged on the intermediate buffer layer 3, one end of the second sliding part 52 is fixedly arranged on the outer rubber layer 4. The support part 53 is located in the gap between the intermediate buffer layer 3 and the outer rubber layer 4, and the support part 53 penetrates the intermediate buffer layer 3 and is connected to the steel wire reinforcement layer 2. Both ends of the swing part 54 are respectively hinged to the first sliding part 51 and the second sliding part 52. The limiting part 56 is arranged on the support part 53 between the other end of the first sliding part 51 and the outer rubber layer 4. Both ends of the spring part 55 are respectively connected to the other end of the first sliding part 51 and the outer rubber layer 4. The liquid impact force inside the overall pipe fitting drives the first sliding part 51 to squeeze the spring part 55, and the limiting part 56 fits with the first sliding part 51 to drive the swing part 54 to swing. The swing part 54 drives the second sliding part 52 to move towards the direction close to the intermediate buffer layer 3, so that the stress between the intermediate buffer layer 3 and the outer rubber layer 4 is continuously transmitted;

[0030] Among them, the spring part 55 is a spring, the swing part 54 is a swing rod, the support part 53 is a support block, and the first sliding part 51 and the second sliding part 52 are respectively two rectangular sliding frames, as Figure 2As shown in the figure, the addition of the spring part 55 and the swing part 54 enables the outer rubber layer 4 to actively approach the middle buffer layer 3 under the action of an external force, thereby reducing the gap between the two, ensuring that the stress can be continuously and evenly transmitted, and avoiding the interruption of stress transmission caused by the stiffness mutation interface. When the pipe fitting is subjected to a liquid impact force, the spring part 55 can provide an additional force to help the outer rubber layer 4 quickly approach the middle buffer layer 3, thereby reducing the impact of the impact force on the structure of the pipe fitting. This design effectively improves the resistance of the pipe fitting to impact loads. The stress transition device 5 formed by the cooperation of the first sliding part 51, the second sliding part 52, the support part 53, the swing part 54, the spring part 55 and the limit part 56 solves the problem of stiffness mutation between the low-stiffness buffer layer and the high-stiffness outer rubber layer 4 in the traditional design, and improves the performance and reliability of the pipe fitting.

[0031] At present, when the existing high-strength steel wire wound reinforced pipe fittings are applied to the fire protection pipeline system, their performance faces severe challenges. The fire protection pipeline not only needs to withstand the continuous impact of high-pressure water flow for a long time, but also needs to cope with the instantaneous high-pressure fluctuations and high-frequency vibrations under extreme working conditions during emergency rescue. Under the action of such dynamic loads, the modulus difference problem between the middle buffer layer 3 and the outer rubber layer 4 is significantly amplified: the low-stiffness buffer layer and the high-stiffness outer rubber layer 4 form a stiffness mutation interface, resulting in the interruption of the stress transmission path. Specifically, the impact force generated by the high-pressure fluctuation forms stress concentration at the interface, and the energy reflection caused by the high-frequency vibration causes the local stress wave superposition effect. This dual action makes the interface bonding area a weak link in the structure, which is extremely easy to cause interlayer peeling, microcrack propagation and even fatigue fracture of the steel wire layer, seriously weakening the overall strength and service life of the pipe fitting.

[0032] To solve the above problems, in this embodiment, when the high-strength steel wire wound reinforced pipe fitting is used in the fire protection pipeline system, when the high-pressure water flow impacts the inner rubber layer 1, the axial displacement of the first sliding part 51 along the guide rail mentioned below cooperates with the spring part 55 to form a first-stage buffer, converting the peak impact force into elastic potential energy; when the pressure fluctuation triggers the limit part 56, the arc-shaped outer edge of the swing rod contacts the stop rod to generate a lever effect, forcing the second sliding part 52 to displace in the reverse direction, converting the rigid stress borne by the outer rubber layer 4 into the flexible deformation of the middle buffer layer 3, effectively eliminating the stiffness mutation interface. This device improves the stress transmission continuity between the middle buffer layer 3 and the outer rubber layer 4, and at the same time uses the multi-directional displacement compensation mechanism under the constraint of the guide rail to reduce the high-frequency vibration energy reflectivity, fundamentally solving the problem of the interruption of the stress transmission path caused by the formation of a stiffness mutation interface between the low-stiffness buffer layer and the high-stiffness outer rubber layer 4.

[0033] Since the high-strength steel wire-wound reinforced pipe fitting is used in a fire protection pipeline system, and the fire protection pipeline not only needs to withstand the continuous impact of high-pressure water flow for a long time, but also needs to cope with the instantaneous high-pressure fluctuations and high-frequency vibrations under extreme working conditions during emergency rescue. Therefore, relative displacement may occur between the first sliding part 51 and the second sliding part 52. To avoid relative displacement between the first sliding part 51 and the second sliding part 52, in an embodiment, guide rails that cooperate with the first sliding part 51 and the second sliding part 52 are respectively provided on the support part 53. In addition, these two guide rails that cooperate with the first sliding part 51 and the second sliding part 52 are fixed together, so that the first sliding part 51, the second sliding part 52 and these two guide rails are limited together, and the first sliding part 51 and the second sliding part 52 can only slide parallelly and will not have relative displacement.

[0034] It is worth mentioning that when the pressure fluctuation triggers the limiting part 56, the arc-shaped outer edge of the swing rod contacts the stop rod to produce a lever effect, forcing the second sliding part 52 to displace in the reverse direction. However, the reverse displacement of the second sliding part 52 cannot move without limit. Since the instantaneous high-pressure fluctuations and high-frequency vibrations in the fire protection pipeline are not easy to monitor, in case of an emergency, the instantaneous high-pressure fluctuations may force the second sliding part 52 to displace too far in the reverse direction. At this time, the spring will be over-compressed beyond its deformation, which will damage the spring. To avoid this problem, in an embodiment, a stop rod is vertically provided at the other end of the first sliding part 51. The stop rod can be attached to the swing part 54. The swing part 54 is a swing rod. The two ends of the swing rod are respectively hinged to the first sliding part 51 and the second sliding part 52. The swing rod between the first sliding part 51 and the second sliding part 52 is rotatably arranged on the support part 53, and the outer edge of the swing rod is an arc-shaped structure. The arc-shaped structure can be attached to the stop rod. The existence of the stop rod and the limiting part 56 can not only make the second sliding part 52 displace in the reverse direction, but also avoid the situation in an emergency where the instantaneous high-pressure fluctuations may force the second sliding part 52 to displace too far in the reverse direction, which will cause the spring to be over-compressed beyond its deformation. At the same time, the arc-shaped structure can also avoid wear of the stop rod caused by frequent movement.

[0035] In order to make the high-strength steel wire-wound reinforced pipe fittings better used in fire-fighting pipelines, in one embodiment, the number of stress transition devices 5 is greater than or equal to four, and the stress transition devices 5 are arranged at equal intervals. The gap between the intermediate buffer layer 3 and the outer rubber layer 4 outside the stress transition device 5 is filled with closed-cell foam elastomer or flexible polyurethane composite material. The steel wire reinforcement layer 2 is made of high-strength steel wire made of high-carbon steel or stainless steel. The surface of the outer rubber layer 4 is coated with an anti-corrosion coating. The equally spaced stress transition devices 5 form an annular stress transfer matrix, which evenly disperses the impact force in the circumferential direction. Combining with the secondary buffering of the closed-cell foam elastomer, the stress concentration can be further reduced. The dynamic loss factor of the closed-cell foam elastomer in the filling material and the stress transition device 5 form a composite damping system, which reduces the reflectivity of high-frequency vibration energy and avoids the superposition effect of stress waves at the interface. In addition, the composite application of high-carbon steel wire and stainless steel, combined with the anti-corrosion coating, improves the fatigue life of the steel wire layer under dynamic loads.

[0036] A method for using a high-strength steel wire-wound reinforced pipe fitting includes the following steps:

[0037] S1: Before installation, check the mechanical structure integrity of the pipe fitting, confirm that the rotational freedom of the swinging part 54 of the stress transition device 5 is ≥30°, the gap between the first sliding part 51 and the guide rail is ≤0.2 mm, and the pre-compression amount of the spring part 55 is 10%-15% of the free length; the ≥30° rotational freedom of the swinging part 54 ensures the dynamic compensation range, and the 0.2 mm guide rail gap control avoids movement jamming, so that the circumferential stress distribution uniformity reaches more than 95%, eliminating the risk of interlayer peeling caused by eccentric load;

[0038] S2: Ensure the uniform circumferential stress distribution between the outer rubber layer 4 and the intermediate buffer layer 3;

[0039] S3: When the fluid is introduced, the pressure in the pipe causes the first sliding part 51 to generate an axial displacement along the guide rail of the support part 53. At the same time, when the compression amount of the spring part 55 reaches more than half of the designed stroke, the limit part 56 is triggered; the limit part 56 is triggered when the spring compression amount reaches half. Through a lever ratio of 1:1.2 - 1.5, displacement compensation is realized, reducing the amplitude of interface stress fluctuation and meeting the working condition requirements of the instantaneous pressure fluctuation of the fire-fighting system;

[0040] S4: When the pressure fluctuates, the contact between the stop rod and the arc surface of the swinging rod generates a lever effect, forcing the second sliding part 52 to move reversely along the guide rail to compensate for the displacement amount, realizing the dynamic stress balance between the intermediate buffer layer 3 and the outer rubber layer 4;

[0041] S5: During periodic maintenance, measure the residual compression stroke of the spring part 55. If the rebound margin < half of the initial value, then synchronously replace the hinge shaft of the swinging part 54, and detect the wear amount of the guide rail working surface for repair machining.

[0042] As described above, it is only the preferred embodiment of the present invention, and there is no limitation to the present invention in any form. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments of equivalent changes within the scope of the technical solution of the present invention by using the above-disclosed technical content. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A high-strength steel wire wound reinforced pipe, characterized in that: The invention comprises an inner rubber layer, a steel wire reinforcement layer, an intermediate buffer layer and an outer rubber layer, wherein the inner rubber layer, the steel wire reinforcement layer, the intermediate buffer layer and the outer rubber layer are sequentially connected to form a pipe fitting as a whole; a stress transition device is arranged between the intermediate buffer layer and the outer rubber layer, and the stress transition device comprises a first sliding part, a second sliding part, a supporting part, a swinging part rotatably arranged on the supporting part, a spring part and a limiting part, one end of the first sliding part is fixedly arranged on the intermediate buffer layer, one end of the second sliding part is fixedly arranged on the outer rubber layer, the supporting part is located in the gap between the intermediate buffer layer and the outer rubber layer, and the supporting part The part passes through the middle buffer layer and is connected with the steel wire reinforcement layer, the two ends of the swinging part are respectively hinged with the first sliding part and the second sliding part, the limiting part is arranged on the supporting part between the other end of the first sliding part and the outer rubber layer, the two ends of the spring part are respectively connected with the other end of the first sliding part and the outer rubber layer, the liquid impact force in the whole pipe fitting drives the first sliding part to squeeze the spring part, the limiting part and the first sliding part are fitted to drive the swinging part to swing, and the swinging part drives the second sliding part to move in the direction close to the middle buffer layer, so that the stress between the middle buffer layer and the outer rubber layer is continuously transmitted.

2. A high-strength steel wire wound reinforced pipe according to claim 1, characterized in that: The support parts are also provided with guide rails respectively cooperating with the first sliding part and the second sliding part.

3. A high-strength steel wire wound reinforced pipe according to claim 1, characterized in that: A blocking rod is vertically arranged on the other end of the first sliding part, and the blocking rod can be fitted with the swinging part.

4. A high-strength steel wire wound reinforced pipe according to claim 3, characterized in that: The swing part is a swing rod, and both ends of the swing rod are respectively hinged to the first sliding part and the second sliding part. The swing rod between the first sliding part and the second sliding part is rotatably set on the support part, and the outer edge of the swing rod is an arc structure, which can be fitted with the baffle rod.

5. The high-strength steel wire wound reinforced pipe according to claim 1, characterized in that: The number of the stress transition devices is greater than or equal to four, and the stress transition devices are arranged at equal intervals.

6. A high-strength steel wire wound reinforced pipe according to claim 5, characterized in that: The gap between the intermediate buffer layer and the outer rubber layer outside the stress transition device is filled with a closed-cell foam elastomer or a flexible polyurethane composite material.

7. The high-strength steel wire wound reinforced pipe according to claim 1, characterized in that: The steel wire reinforcement layer is a high-strength steel wire made of high-carbon steel or stainless steel.

8. The high-strength steel wire wound reinforced pipe according to claim 1, characterized in that: The surface of the outer rubber layer is coated with an anti-corrosion coating.

9. A method for using a high-strength steel wire wound reinforced pipe fitting, based on the high-strength steel wire wound reinforced pipe fitting according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Check the mechanical structural integrity of the pipe fitting before installation, confirm that the swinging part of the stress transition device has a rotational freedom of ≥30°, the clearance between the first sliding part and the guide rail is ≤0.2mm, and the pre-compression of the spring part is 10%-15% of the free length; S2: Ensure that the circumferential stress between the outer rubber layer and the intermediate buffer layer is evenly distributed; S3: When the fluid is introduced, the pressure in the tube causes the first sliding part to produce an axial displacement along the guide rail of the support part, and at the same time, the limit part is triggered when the compression amount of the spring part reaches more than half of the designed stroke; S4: When the pressure fluctuates, the contact between the blocking rod and the arc surface of the swing rod produces a lever effect, forcing the second sliding part to move in the opposite direction along the guide rail to compensate for the displacement, thereby achieving dynamic stress balance between the intermediate buffer layer and the outer rubber layer; S5: During periodic maintenance, measure the residual compression stroke of the spring part. If the rebound margin is less than half of the initial value, replace the swing part hinge shaft simultaneously, detect the wear amount of the guide rail working surface, and perform repair processing.

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