CN-121993669-A - Double-layer metal flexible connecting pipe and manufacturing process

CN121993669ACN 121993669 ACN121993669 ACN 121993669ACN-121993669-A

Abstract

The invention discloses a double-layer metal flexible connecting pipe and a manufacturing process, which belong to the technical field of pipeline connection and comprise an outer armor, an inner armor is nested in the outer armor, a plurality of buffer mechanisms are nested between the outer armor and the inner armor, the buffer mechanisms are arranged along an array of the outer armor and the inner armor, contact friction between the outer armor and the inner armor is reduced through the buffer mechanisms, an inner soft layer is arranged in the inner armor, and a protective coating is arranged in the inner soft layer. According to the invention, the buffer mechanism consisting of the flexible ring, the ball groove, the gasket and the balls is arranged, so that the outer armor and the inner armor are supported by ball point contact and rolling contact, the two armor layers are free from large-area direct friction in the bending, torsion or vibration process, the abrasion loss is obviously reduced, and the durability of the product is improved. The array arrangement of the buffer mechanisms can also uniformly disperse external loads, improving overall flexibility.

Inventors

SONG ZHENGQUAN
SONG ZHENGFANG
NI XUDONG

Assignees

苏州格林新材料科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260112

Claims (10)

1. The utility model provides a double-deck metal flexible connection pipe, its characterized in that, including outer armor, outer armor is interior to be nested to have interior armor, and it has a plurality of buffer gear to nest between outer armor and the interior armor, and buffer gear arranges along outer armor and interior armor array, reduces the contact friction between outer armor and the interior armor through buffer gear, be equipped with interior soft layer in the interior armor, be equipped with protective coating in the interior soft layer.
2. The double-layer metal flexible connecting pipe according to claim 1, wherein the buffer mechanism comprises a flexible ring, the flexible ring is sleeved outside the inner armor, a plurality of ball grooves are formed in the outer peripheral side of the flexible ring along the axis in a surrounding mode, gaskets are embedded in the ball grooves, balls are connected in a rotating mode, two sides of the balls are respectively in contact connection with the outer armor and the inner armor, and friction between the outer armor and the inner armor is reduced through rotation of the balls.
3. The double-layer metal flexible connecting pipe according to claim 2, wherein adjacent flexible rings are connected through tension tendons, and the tension tendons are elastic tendons.
4. The double-layer metal flexible connecting pipe according to claim 2, wherein the outer armor is a stainless steel braiding layer, a tungsten carbide coating is sprayed on the outer armor, and the outer armor is a diamond braiding layer.
5. The double-layer metal flexible joint pipe according to claim 1, wherein the inner armor is a helical bellows layer.
6. The double-layer metal hose according to claim 1, wherein the inner hose layer is a Polytetrafluoroethylene (PTFE) hose and the protective coating is a zirconia nano-coating.
7. A process for manufacturing a double-layer metal flexible connecting pipe, which is characterized by being applied to the double-layer metal flexible connecting pipe as claimed in any one of claims 1 to 6, and specifically comprising the following steps: S1, stretching and shaping an austenitic stainless steel wire to a required diameter, ensuring the wire diameter tolerance, removing burrs to obtain a pretreated steel wire, chemically degreasing and passivating the steel wire, extruding polytetrafluoroethylene material out of a hose, controlling the extrusion process to be at 360-380 ℃, carrying out vacuum curing to bake and stretch shaping after extrusion, cleaning and drying the hose, and detecting the size of the hose; S2, extruding the PTFE hose, producing the PTFE hose by using a high-pressure extruder, controlling the extrusion temperature to be 340-360 ℃, the stretching speed and the cooling water temperature, cutting the extruded hose into a required length by a cutting machine, and then carrying out infrared or steam drying and shaping; S3, uniformly depositing a zirconia nano coating on the inner wall of the PTFE through magnetron sputtering, placing the cleaned PTFE hose into a rotary clamp, placing the rotary clamp in a vacuum chamber, depositing zirconia through a stirring type magnetron sputtering target material, controlling the process temperature to be below 100-200 ℃ so as to prevent deformation of the PTFE hose, and carrying out surface roughness detection and binding force test to ensure uniform coverage and no spalling of the coating; S4, combining PTFE and a corrugated pipe, sliding a PTFE hose coated with zirconia into the prefabricated corrugated pipe, wherein the inner diameter of the corrugated pipe is slightly contracted, medium lubrication is adopted during assembly, the hose is inserted in a slow rotating mode until the two ends are aligned, the inner wall coating is kept complete and does not fall off, the hose is prevented from being scratched by a tip, and after the assembly is completed, the two ends are mechanically pressed and fixed; S5, prefabricating and batch assembling a buffer mechanism, producing flexible rings, ball grooves and gasket parts in batches through injection molding, casting or stamping processes, carrying out surface polishing treatment on the ball groove rings and other parts to ensure spherical surface contact precision, using a ball automatic feeding device to push balls into the ball grooves in sequence for automatic assembly, sleeving the flexible rings and the gaskets into the peripheries of the corrugated pipes through miniature robots after each buffer unit is assembled, locking by using clamps, and carrying out real-time verification by adopting visual detection or mechanical limit sensors to confirm that the parts such as the ball grooves, springs and the like are correctly positioned, and continuing the next step; s6, braiding by using a multi-spindle braiding machine, configuring the braiding machine, enabling steel wires to be sleeved around the inner layer in a staggered and crossed mode, controlling the steel wires in a constant tension mode in the braiding process, monitoring in real time by using a tension sensor, adjusting by using a servo motor, ensuring that the tension of the steel wires in the whole length is consistent, spraying a tungsten carbide coating after the outer layer braiding is finished, spraying tungsten carbide powder onto the surface of the braiding layer by using ion spraying, eliminating stress by using homogenization heat treatment, and testing the adhesive strength of the coating to finish the preparation.
8. The process for manufacturing a double-layered metal flexible joint pipe according to claim 7, wherein the step S6 of configuring the braiding machine comprises braiding steel wires by diamond.
9. The manufacturing process of the double-layer metal flexible connecting pipe according to claim 7, wherein the medium lubrication is glycerol lubrication during the assembling in the step S4.
10. The process for manufacturing a double-layer metal flexible joint pipe according to claim 7, wherein the spraying of tungsten carbide powder onto the surface of the braid layer by ion spraying comprises the following steps: S201, cleaning the surface of the weaving layer by using compressed air or ultrasonic waves to remove impurities such as greasy dirt, particles and the like; S202, coarsening by using a sand blasting method, wherein the sand blasting pressure is 0.4-0.6 MPa, the sand blasting angle is 60-90 degrees, the distance is 100-150 mm, and the surface of the stainless steel wire is coarsened to have a surface roughness (Ra) of 4-6 mu m through the granularity of 24-46 meshes of alumina sand; s203, under the protection of protective gas argon and hydrogen, a spray gun, a plasma power supply, a powder feeder and a robot arm/track spraying platform pass through powder granularity WC-Co alloy powder, the particle size is 15-45 mu m, and the coating thickness is 60-120 mu m; S204, preheating equipment, performing trial spraying, starting a spraying system, performing spray gun preheating and parameter stable operation, performing sample spraying on a test board, debugging the spraying thickness and uniformity, slowly moving a braided tube through a rotary clamp or a linear track, controlling the spray gun to scan in parallel on the surface of the tube body in a spiral track, ensuring uniform coverage, rotating a hose for a certain angle after each pass, performing the next circle of coverage, and repeating the scanning for multiple times to reach the target thickness; S205, cooling and post-treatment, and naturally cooling to room temperature after spraying.

Description

Double-layer metal flexible connecting pipe and manufacturing process Technical Field The invention belongs to the technical field of pipeline connection, and particularly relates to a double-layer metal flexible connecting pipe and a manufacturing process thereof. Background Flexible metal tubing is widely used in flexible fluid delivery systems, such as high temperature fluid delivery, flexible equipment connections, mechanical vibration isolation, and electromagnetic shielding tubing. The metal flexible connecting pipe is generally composed of an outer metal braiding layer and an inner metal hose, compression resistance, bending resistance and certain flexibility are achieved through cooperation of the outer metal braiding layer and the inner metal hose, however, along with continuous improvement of requirements of application scenes on flexibility, wear resistance and service life, the traditional structure gradually exposes various problems. Traditional outer armor and interior armor direct contact friction can produce high frequency friction under long-term buckling, vibration or pulsation pressure effect between outer weaving layer and the interior tubular metal resonator, not only causes the metal piece to drop, still can accelerate wearing and tearing, shortens metal collapsible tube life-span to probably lead to shielding performance decline or local hardening, influence the flexibility performance, there is the improvement room. Disclosure of Invention The invention aims to solve the problem of direct contact friction between an outer armor and an inner armor, and provides a double-layer metal flexible connecting pipe and a manufacturing process thereof. In order to achieve the above purpose, the present invention adopts the following technical scheme: The utility model provides a double-deck metal flexible connection pipe, includes outer armor, and the interior nest of outer armor has interior armor, and the nest has a plurality of buffer gear between outer armor and the interior armor, and buffer gear arranges along outer armor and interior armor array, reduces the contact friction between outer armor and the interior armor through buffer gear, be equipped with interior soft layer in the interior armor, be equipped with protective coating in the interior soft layer. As a further description of the above technical solution: The buffer mechanism comprises a flexible ring, the flexible ring is sleeved outside the inner armor, a plurality of ball grooves are formed in the periphery of the flexible ring along the axis in a surrounding mode, gaskets are embedded in the ball grooves, balls are connected in a rotating mode, two sides of each ball are respectively in contact connection with the outer armor and the inner armor, and friction between the outer armor and the inner armor is reduced through rotation of the balls. As a further description of the above technical solution: Adjacent flexible rings are connected through tension bars, and the tension bars are elastic bar ropes. As a further description of the above technical solution: the outer armor is a stainless steel weaving layer, a tungsten carbide coating is sprayed outside the outer armor, and the outer armor is a diamond weaving layer. As a further description of the above technical solution: The inner armor is a spiral corrugated pipe layer. As a further description of the above technical solution: the inner soft layer is a Polytetrafluoroethylene (PTFE) hose, and the protective coating is a zirconia nano coating. As a further description of the above technical solution: the manufacturing process of the double-layer metal flexible connecting pipe specifically comprises the following steps: S1, stretching and shaping an austenitic stainless steel wire to a required diameter, ensuring the wire diameter tolerance, removing burrs to obtain a pretreated steel wire, chemically degreasing and passivating the steel wire, extruding polytetrafluoroethylene material out of a hose, controlling the extrusion process to be at 360-380 ℃, carrying out vacuum curing to bake and stretch shaping after extrusion, cleaning and drying the hose, and detecting the size of the hose; S2, extruding the PTFE hose, producing the PTFE hose by using a high-pressure extruder, controlling the extrusion temperature to be 340-360 ℃, the stretching speed and the cooling water temperature, cutting the extruded hose into a required length by a cutting machine, and then carrying out infrared or steam drying and shaping; S3, uniformly depositing a zirconia nano coating on the inner wall of the PTFE through magnetron sputtering, placing the cleaned PTFE hose into a rotary clamp, placing the rotary clamp in a vacuum chamber, depositing zirconia through a stirring type magnetron sputtering target material, controlling the process temperature to be below 100-200 ℃ so as to prevent deformation of the PTFE hose, and carrying out surface roughness detection and binding force test to e