Device for producing a bimetallic composite pipe

Abstract

The utility model relates to a preparation device of bimetal composite pipe relates to oil pipe technical field, including platform, the feeding platform is equipped with on platform and slides, one side of platform is equipped with the fixed distance positioning device of fixing a plurality of to be expanded composite steel pipe, the liquid distribution cavity body extending along the transverse is fixedly connected on the feeding platform, a plurality of hydraulic expansion pipes are fixedly connected on the liquid distribution cavity body and are connected with its inner chamber, and the hydraulic expansion pipe sets up along the longitudinal extension. The utility model solves the problem that the liquid pressure composite method in traditional technology needs to seal the two ends of the composite stainless steel lining, to pressurize and expand the stainless steel inner hole, the efficiency is relatively slow, and there is pressure relief time after construction is completed, and the liquid is open during pressure relief, which is easy to splash to the surroundings, causing certain influence on the environment.

Description

Technical Field

[0001] This utility model relates to the field of oil pipe technology, specifically to a device for preparing bimetallic composite pipes. Background Technology

[0002] With the global development of oil and gas extraction and transportation to highly corrosive environments such as oceans and deep wells, the high levels of corrosive substances such as CO2 and H2S in oil and gas fields often lead to significant economic losses and accidents due to pipeline corrosion. These problems include: 1) severe scaling and corrosion in water injection well tubing; 2) corrosion, scaling, and perforation in surface pipelines; 3) uneven wear and corrosion of downhole pipes, resulting in the scrapping of a large number of pipes; and 4) the inability of existing lined and coated pipes to withstand high temperatures, leaving corrosion and uneven wear in deep well sections unresolved. Therefore, improving the corrosion resistance of steel pipes is one of the most important research topics in the current steel pipe industry.

[0003] High-quality stainless steel or high-alloy seamless steel pipes are used, and due to the large amount of alloying elements added, their price is several times or even tens of times that of ordinary seamless steel pipes. Using corrosion-resistant alloys is an effective measure to improve the safety of oil and gas pipelines in highly corrosive oil and gas fields. However, only about one-third of the pipe is used for corrosion resistance, with the remainder used for structural support. Furthermore, because pure alloy pipes have low pressure resistance, a larger wall thickness is required for the same pressure, resulting in resource waste. For many years, researchers have been striving to find a high-performance composite pipe that can meet the harsh operating environments of strong corrosion, high wear, and high working pressure while remaining cost-effective. Studies have shown that using bimetallic composite pipes is one of the safest and most economical ways to solve the corrosion problem of oil and gas pipelines.

[0004] Commonly used manufacturing methods include: cold forming, hot rolling, hot extrusion composite method, combined bimetallic hydraulic composite method, centrifugal casting or centrifugal aluminothermic method, explosive welding composite method, composite plate welding method, powder metallurgy method, spray forming method, surfacing welding method, laser cladding method, etc. These manufacturing processes all have their own shortcomings, such as complex procedures and low efficiency, or the products produced have defects such as stress, pinholes, and pores.

[0005] As existing preparation equipment has been used, its shortcomings have gradually become apparent, mainly in the following aspects:

[0006] First, the existing hydraulic composite method requires sealing both ends of the composite stainless steel lining before pressurizing and expanding the stainless steel inner hole, which is relatively slow. After construction, there is also a time for depressurization. At the same time, the liquid is open during depressurization, which can easily splash to the surroundings and have a certain impact on the environment.

[0007] Secondly, existing expansion tubes can only expand and pressurize a single inner steel liner, reducing the production efficiency of bimetallic composite pipes.

[0008] Third, the existing equipment requires operators to position each steel pipe and ensure the spacing between adjacent steel pipes, which is cumbersome, labor-intensive, and cannot guarantee the production efficiency of bimetallic composite pipes.

[0009] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0010] To address the shortcomings of existing technologies, this utility model provides a device for preparing bimetallic composite pipes. This device solves the problems of traditional hydraulic composite methods, which require sealing both ends of the composite stainless steel lining before pressurizing and expanding the stainless steel inner hole. This process is relatively slow, requires depressurization time after construction, and the liquid is exposed during depressurization, which can easily splash into the surrounding environment and cause some environmental impact.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] An apparatus for preparing bimetallic composite pipes includes a platform with a slidable feeding platform. A positioning device for fixing several composite steel pipes to be expanded is provided on one side of the platform. A laterally extending liquid distribution cavity is fixedly connected to the feeding platform. Several hydraulic expansion pipes are fixedly connected side-by-side to the liquid distribution cavity and communicate with its inner cavity. The hydraulic expansion pipes extend longitudinally.

[0013] A powder-spreading box is fixedly connected to the other end of the platform near the hydraulic expansion tube. The powder-spreading box is located above the hydraulic expansion tube, and the bottom of the powder-spreading box has a powder-dropping hole that is opposite to the position of each hydraulic expansion tube.

[0014] As an optimized solution, the platform is provided with several support wheels arranged in parallel along the longitudinal direction for each of the hydraulic expansion tubes, and the lower surface of the hydraulic expansion tubes is in frictional contact with the support wheels.

[0015] As an optimized solution, the longitudinal section of the powder-spreading box is funnel-shaped, and the upper end of the powder-spreading box is open.

[0016] As an optimized solution, the lower end of the powder-spreading box is fixedly connected to an arc-shaped bottom shell, and the powder-dropping hole is opened on the arc-shaped bottom shell.

[0017] As an optimized solution, a rotating shaft arranged in a horizontal direction is rotatably installed inside the powder dispensing box. The peripheral wall of the rotating shaft is surrounded by material-dispensing blades, and the outer end of the material-dispensing blades is in frictional contact with the inner bottom surface of the arc-shaped bottom shell.

[0018] As an optimized solution, the support wheel has a V-shaped annular guide groove on its wheel wall.

[0019] As an optimized solution, the platform is provided with two longitudinally extending guide rails in parallel, and the feed platform is slidably supported on the guide rails by guide seats.

[0020] As an optimized solution, the bottom of the feed platform is fixedly connected to a bracket, and the guide seat is fixedly connected to the bottom of the bracket.

[0021] As an optimized solution, both ends of the powder-spreading box are fixed to the platform via side frames.

[0022] As an optimized solution, the platform is provided with a powder collection shell located below the powder dispensing box, and the upper end of the powder collection shell is open.

[0023] As an optimized solution, the liquid distribution chamber is fixedly connected to the bottom of the feed platform, and a hydraulic booster system connected to the liquid distribution chamber is also fixedly connected to the bottom of the feed platform.

[0024] As an optimized solution, a motor for driving the rotating shaft is fixedly connected to the outer end wall of the liquid distribution chamber shell.

[0025] As an optimized solution, the positioning device includes a base, a positioning platform that rises and falls vertically along the upper edge of the base, and several positioning grippers that are horizontally arranged side by side along the upper edge of the positioning platform.

[0026] The base is fixedly connected to steel pipe support platforms on both sides of the positioning platform. Each steel pipe support platform has a vertically movable fixed distance platform on one side. Each fixed distance platform has a swing-mounted fixed distance claw hinged to each positioning claw.

[0027] As an optimized solution, the positioning platform is provided with a positioning mounting groove, and each positioning gripper includes two arc-shaped claws that are hinged to each other in the positioning mounting groove. The two arc-shaped claws move towards each other or in opposite directions through a driving structure.

[0028] As an optimized solution, the drive structure includes a support frame fixedly connected to the bottom of the positioning platform. A drive cylinder is vertically fixedly connected to each of the positioning claws on the support frame. A drive plate is horizontally fixedly connected to the upper end of the drive cylinder. An extension section is fixedly connected to the hinge end of the arc-shaped claw. A rectangular sliding hole is opened on the extension section. Drive columns that are slidably constrained in the two rectangular sliding holes are fixedly connected to both ends of the drive plate.

[0029] As an optimized solution, connecting plates are fixedly connected to both ends of the positioning platform, and a first lifting cylinder is vertically fixedly connected to each connecting plate on the base, with the extension and retraction end of the first lifting cylinder fixedly connected to the connecting plate.

[0030] As an optimized solution, a fixed-distance mounting groove is provided on the fixed-distance platform, and the fixed-distance claw includes a pressing plate hinged in the fixed-distance mounting groove. A baffle is vertically fixed to the hinge end of the pressing plate. The weight of the baffle is greater than the weight of the pressing plate. Under normal conditions, the baffle is located in the fixed-distance mounting groove, and the pressing plate extends out of the fixed-distance mounting groove.

[0031] As an optimized solution, a limiting plate is fixedly attached to the side wall of the pressing plate, and under normal conditions, the lower end of the limiting plate abuts against the upper edge of the fixed-distance mounting groove.

[0032] As an optimized solution, when the steel pipe presses down the pressing plate, the pressing plate is located in the fixed-distance mounting groove, and the baffle extends out of the fixed-distance mounting groove.

[0033] As an optimized solution, the positioning platform is vertically fixed to the top of the end near the crushing plate with a positioning post.

[0034] As an optimized solution, C-shaped guide frames are fixedly connected to the base at both ends corresponding to the fixed-distance platform, and the ends of the fixed-distance platform are in frictional contact with the inner wall of the guide frames.

[0035] As an optimized solution, several second lifting cylinders are fixedly connected in parallel on the base, and the telescopic ends of the second lifting cylinders are fixedly connected to the bottom surface of the fixed-distance platform.

[0036] As an optimized solution, the base is inclined downward toward the positioning post.

[0037] Compared with the prior art, the beneficial effects of this utility model are:

[0038] A liquid distribution chamber is set on the feeding platform, and several hydraulic expansion tubes are fixed in parallel on the liquid distribution chamber. This allows several hydraulic expansion tubes to be filled with liquid at the same time. The liquid distribution chamber is driven to move by the feeding platform, which can drive several hydraulic expansion tubes at the same time. This enables several inner steel pipes to be expanded and pressurized at the same time, improving the production efficiency of bimetallic composite pipes.

[0039] By setting up a powder-spreading box on the platform, which is located near the end of the hydraulic expansion tube, the powder-spreading box can automatically spread powder on the surface of the hydraulic expansion tube during the feeding process. The bottom of the heat dissipation box has powder-spreading holes corresponding to each hydraulic expansion tube, which can make the talcum powder fall accurately onto the hydraulic expansion tube through the powder-spreading holes, reducing the amount of talcum powder used.

[0040] The steel pipes are supported by a steel pipe support platform. When spacing several steel pipes, the first lifting cylinder lowers the positioning platform to the area below the steel pipe support platform, and the second lifting cylinder raises the spacing platform, so that the spacing claw is above the steel pipe support platform. The steel pipes are unloaded from the carriage on one side of the base. Due to the slight tilt of the base, the steel pipes can automatically roll along the steel pipe support platform towards the lower side under the tilting guide action. Under normal circumstances, the weight of the baffle is greater than the weight of the pressing plate. Under normal circumstances, the baffle is located in the spacing installation groove, and the pressing plate extends out of the spacing installation groove. The rolling steel pipes will sequentially... The pressure plate is pressed down and moved to the lower side of the steel pipe support platform. The positioning platform is located at the top of the end near the pressure plate, and a positioning column is vertically fixed. When the first rolling steel pipe comes into contact with the positioning column, it is positioned. Subsequent steel pipes will be sequentially limited to the area between two adjacent positioning claws. Since the positioning claws of the positioning platform correspond to the positioning claws, the first lifting cylinder drives the positioning platform to rise, and then the drive cylinder drives the positioning claws to close, so as to achieve precise positioning of the steel pipe. It can realize the simultaneous automatic positioning of several steel pipes, eliminating the need for operators to perform positioning operations alone and improving the production efficiency of bimetallic composite pipes.

[0041] After the pressure is applied to the steel pipe, when the steel pipe is unloaded, the positioning claw first releases the positioning of the steel pipe, the first lifting cylinder drives the positioning claw to descend, and then the second lifting cylinder drives the distance platform to descend. The positioning column follows the distance platform to descend and releases the limit on the end of the steel pipe. Under the action of the inclined steel pipe support platform, the steel pipe automatically rolls down to complete the automatic unloading, which is convenient and fast.

[0042] This utility model utilizes a pressurization system and multiple elastic expansion bags to simultaneously pressurize and expand multiple composite tubes, causing the inner stainless steel lining tube to expand and form a tight fit with the outer base tube, thus forming a new type of composite tube. This solves the problems of low efficiency, stress, pinholes, and bubbles in the existing bimetallic composite tube manufacturing process.

[0043] Throughout the entire pressurization and depressurization process, this invention utilizes a hydraulic expansion bag, ensuring that the liquid remains sealed and does not impact the environment. Furthermore, a single pressurization system can simultaneously pressurize and composite multiple pipes, resulting in high efficiency. Attached Figure Description

[0044] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0045] Figure 1 This is a schematic diagram of the structure of this utility model;

[0046] Figure 2 This is a schematic diagram of the structure of the feed platform of this utility model;

[0047] Figure 3 This is a top view of the structure of the feed platform of this utility model;

[0048] Figure 4 This is a schematic diagram of the distance positioning device of this utility model;

[0049] Figure 5 This is a schematic diagram of the structure of the fixed-distance stage of this utility model;

[0050] Figure 6 This is a schematic diagram of the positioning platform of this utility model.

[0051] In the diagram: 1-Base; 2-Positioning platform; 3-Positioning gripper; 4-Distance platform; 5-Distance gripper; 6-Steel pipe support platform; 7-Guide frame; 8-Positioning column; 9-Steel pipe; 10-Pressing plate; 11-Baffle; 12-Distance mounting slot; 13-Limit plate; 14-First lifting cylinder; 15-Positioning mounting slot; 16-Arc-shaped gripper; 17-Drive plate; 18-Rectangular sliding hole; 19-Drive column; 20-Support frame; 21-Drive cylinder 22-Second lifting cylinder; 23-Connecting plate; 24-Liquid distribution chamber; 25-Hydraulic booster system; 26-Guide rail; 27-Guide seat; 28-Support wheel; 29-Powder spreading box; 30-Arched bottom shell; 31-Rotating shaft; 32-Powder feeding blade; 33-Powder drop hole; 34-Powder collecting shell; 35-Side frame; 36-Platform; 37-Feeding platform; 38-Hydraulic expansion pipe; 39-Composite steel pipe to be expanded; 40-Distance positioning device. Detailed Implementation

[0052] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0053] like Figures 1 to 6 As shown, the apparatus for preparing bimetallic composite tubes includes the following steps:

[0054] S1: Insert the stainless steel lining pipe 9 into the steel pipe to be lined 9 to form a composite steel pipe to be expanded 39.

[0055] S2: Several composite steel pipes 39 to be expanded are fixed at intervals one by one by a spacer positioning device 40;

[0056] S3: Several hydraulic expansion tubes 38 are inserted into the composite steel pipe 39 to be expanded via the feed platform 37;

[0057] S4: The hydraulic expansion tube 38 is pressurized and expanded to increase the inner diameter of the stainless steel liner tube 9 and make it fit tightly with the inner diameter of the steel tube to be lined 9. Then the pressure is continuously increased to make the outer diameter of the steel tube to be lined 9 expand slightly elastically. After stabilizing the pressure for a certain period of time, the hydraulic expansion tube 38 is depressurized to form a bimetallic composite tube.

[0058] S5: The feed platform 37 drives several hydraulic expansion tubes 38 to be pulled out from the bimetallic composite tube and drives the hydraulic expansion tubes 38 to reset.

[0059] After the composite steel pipe is assembled, it enters the next process, which involves cutting off the excess stainless steel pipe at both ends, then spinning and flanging on both sides, sealing and welding the ends, threading, attaching section clamps, and bundling and packaging.

[0060] The feed platform 37 is slidably mounted on the platform 36. A liquid distribution chamber 24 extending laterally is fixedly connected to the feed platform 37. Several hydraulic expansion pipes 38 are fixedly connected side by side to the liquid distribution chamber 24 and communicate with its inner cavity. The hydraulic expansion pipes 38 are arranged to extend longitudinally.

[0061] A powder-spreading box 29 is fixedly connected to the other end of the platform 36 near the hydraulic expansion tube 38. The powder-spreading box 29 is located above the hydraulic expansion tube 38, and the bottom of the powder-spreading box 29 has a powder-dropping hole 33 corresponding to the position of each hydraulic expansion tube 38.

[0062] On platform 36, several support wheels 28 are arranged in parallel along the longitudinal direction for each hydraulic expansion tube 38, and the lower surface of the hydraulic expansion tube 38 is in frictional contact with the support wheels 28.

[0063] The powder-spreading box 29 has a funnel-shaped longitudinal section and an opening at the top.

[0064] The lower end of the powder-spreading box 29 is fixedly connected to an arc-shaped bottom shell 30, and the powder-dropping hole 33 is opened on the arc-shaped bottom shell 30.

[0065] A rotating shaft 31 is installed inside the powder dispensing box and is arranged horizontally. The peripheral wall of the rotating shaft 31 is surrounded by material-dispensing blades 32, and the outer end of the material-dispensing blades 32 is in frictional contact with the inner bottom surface of the arc-shaped bottom shell 30.

[0066] The support wheel 28 has an annular guide groove arranged in a V-shape on its wheel wall.

[0067] The platform 36 has two longitudinally extending guide rails 26 arranged side by side, and the feed platform 37 is slidably supported on the guide rails 26 by the guide seat 27.

[0068] The bottom of the feed platform 37 is fixedly connected to a bracket, and the guide seat 27 is fixedly connected to the bottom of the bracket.

[0069] The two ends of the powder-spreading box 29 are fixed to the platform 36 via side frames 35.

[0070] Platform 36 is located below powder box 29 and has a powder collection shell 34 with an opening at the upper end.

[0071] The liquid distribution chamber 24 is fixedly connected to the bottom of the feed platform 37, and a hydraulic booster system 25 connected to the liquid distribution chamber 24 is also fixedly connected to the bottom of the feed platform 37.

[0072] A motor with a drive shaft 31 is fixedly connected to the outer end wall of the liquid distribution chamber shell.

[0073] The distance positioning device 40 includes a base 1, a positioning platform 2 that is vertically raised and lowered along the upper edge of the base 1, and several positioning grippers 3 that are horizontally arranged side by side along the upper edge of the positioning platform 2.

[0074] The base 1 is fixed with steel pipe support platforms 6 on both sides of the positioning platform 2. Each steel pipe support platform 6 has a vertically lifting fixed platform 4 on one side. The fixed platform 4 is hinged with a swinging fixed claw 5 corresponding to each positioning claw 3.

[0075] The positioning table 2 has a positioning mounting groove 15. Each positioning gripper 3 includes two arc-shaped claws 16 that are hinged to each other in the positioning mounting groove 15. The two arc-shaped claws 16 move towards each other or in opposite directions through a driving structure.

[0076] The drive structure includes a support frame 20 fixedly connected to the bottom of the positioning table 2. A drive cylinder 21 is vertically fixedly connected to each positioning claw 3 on the support frame 20. A drive plate 17 is horizontally fixedly connected to the upper end of the drive cylinder 21. An extension section is fixedly connected to the hinge end of the arc-shaped claw 16. A rectangular sliding hole 18 is provided on the extension section. Drive columns 19 that are slidably constrained in the two rectangular sliding holes 18 are fixedly connected to both ends of the drive plate 17.

[0077] The two ends of the positioning platform 2 are respectively fixed with connecting plates 23. The base 1 is vertically fixed with a first lifting cylinder 14 corresponding to each connecting plate 23. The telescopic end of the first lifting cylinder 14 is fixed with the connecting plate 23.

[0078] The distance-fixing platform 4 has a distance-fixing mounting groove 12. The distance-fixing claw 5 includes a pressing plate 10 hinged in the distance-fixing mounting groove 12. A baffle 11 is vertically fixed to the hinge end of the pressing plate 10. The weight of the baffle 11 is greater than the weight of the pressing plate 10. Under normal conditions, the baffle 11 is located in the distance-fixing mounting groove 12, and the pressing plate 10 extends out of the distance-fixing mounting groove 12.

[0079] A limiting plate 13 is fixedly attached to the side wall of the pressing plate 10. Under normal conditions, the lower end of the limiting plate 13 abuts against the upper edge of the fixed-distance mounting groove 12.

[0080] When the steel pipe 9 presses down the pressing plate 10, the pressing plate 10 is located in the fixed-distance installation groove 12, and the baffle 11 extends out of the fixed-distance installation groove 12.

[0081] The positioning platform 4 is located at the top of the end near the pressure plate 10, and a positioning column 8 is vertically fixed thereto.

[0082] The base 1 has C-shaped guide frames 7 fixedly connected to both ends of the fixed-distance platform 4, and the ends of the fixed-distance platform 4 are in frictional contact with the inner wall of the guide frame 7.

[0083] Several second lifting cylinders 22 are fixedly connected in parallel on the base 1, and the telescopic ends of the second lifting cylinders 22 are fixedly connected to the bottom surface of the fixed-distance platform 4.

[0084] The base 1 is tilted downwards toward the positioning post 8.

[0085] The working principle of this device is as follows:

[0086] A liquid distribution chamber 24 is provided on the feeding platform 37, and several hydraulic expansion tubes 38 are fixed in parallel on the liquid distribution chamber 24. This allows the liquid to be filled into several hydraulic expansion tubes 38 at the same time. The liquid distribution chamber 24 is driven to move by the feeding platform 37, which allows the liquid to be driven at the same time. This enables the expansion and pressurization of several inner steel pipes 9 at the same time, thus improving the production efficiency of bimetallic composite pipes.

[0087] By setting a powder-spreading box 29 on the platform 36, which is close to the end of the hydraulic expansion tube 38, the powder-spreading box 29 can automatically spread powder on the surface of the hydraulic expansion tube 38 during the feeding process; the bottom of the heat dissipation box has powder-spreading holes corresponding to each hydraulic expansion tube 38, which can make talcum powder fall accurately onto the hydraulic expansion tube 38 through the powder-spreading holes, reducing the amount of talcum powder used;

[0088] The steel pipes 9 can be supported by the steel pipe support platform 6. When several steel pipes 9 are spaced, the first lifting cylinder drives the positioning platform 2 to descend to the area below the steel pipe support platform 6, and the second lifting cylinder drives the spacer platform 4 to rise, so that the spacer claw 5 is above the steel pipe support platform 6. The steel pipes 9 are unloaded from the carriage on one side of the base 1. Because the base 1 is slightly tilted, the steel pipes 9 can automatically roll along the steel pipe support platform 6 towards the side with lower height under the tilting guide action. Since the weight of the baffle 11 is greater than the weight of the pressing plate 10 under normal conditions, the baffle 11 is normally located in the spacer mounting groove 12, and the pressing plate 10 extends out of the spacer mounting groove 12. The rolling steel pipes 9 will... The pressing plate 10 is pressed down in sequence and moved to the lower side of the steel pipe support platform 6. The positioning platform 4 is located at the top of the end near the pressing plate 10 and the positioning column 8 is vertically fixed. When the first rolling steel pipe 9 comes into contact with the positioning column 8, it is positioned. The subsequent steel pipes 9 will be limited in the area between two adjacent positioning claws 5. Since the positioning claws 3 of the positioning platform 2 correspond to the positioning claws 5, the first lifting cylinder drives the positioning platform 2 to rise. Then the driving cylinder 21 drives the positioning claws to close, so as to achieve precise positioning of the steel pipe 9. It can realize the automatic positioning of several steel pipes 9 simultaneously, which saves the operator from operating the positioning operation alone and improves the production efficiency of bimetallic composite pipes.

[0089] After the pressure is applied to the steel pipe 9, when the steel pipe 9 is unloaded, the positioning claw first releases the positioning of the steel pipe 9, the first lifting cylinder drives the positioning claw to descend, and then the second lifting cylinder drives the distance platform 4 to descend. The positioning column 8 follows the distance platform 4 to descend and release the restriction on the end of the steel pipe 9. Under the action of the inclined steel pipe support platform 6, the steel pipe 9 automatically rolls down to complete the automatic unloading, which is convenient and fast.

[0090] This utility model utilizes a pressurization system and multiple elastic expansion bags to simultaneously pressurize and expand multiple composite pipes, causing the inner stainless steel liner 9 to expand and form a tight fit with the outer base pipe, thus forming a new type of composite pipe. This solves the problems of low efficiency, stress, pinholes, and bubbles in the existing bimetallic composite pipe manufacturing process.

[0091] Throughout the entire pressurization and depressurization process, this invention utilizes a hydraulic expansion bag, ensuring that the liquid remains sealed and does not impact the environment. Furthermore, a single pressurization system can simultaneously pressurize and composite multiple pipes, resulting in high efficiency.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. An apparatus for preparing bimetallic composite tubes, characterized in that: The system includes a platform (36), on which a feeding platform (37) is slidably provided, and on one side of the platform (36) is a distance positioning device (40) for fixing several composite steel pipes (39) to be expanded. A liquid distribution cavity (24) extending laterally is fixedly connected to the feed platform (37). Several hydraulic expansion tubes (38) are fixedly connected side by side to the liquid distribution cavity (24) and communicate with its inner cavity. The hydraulic expansion tubes (38) are arranged to extend longitudinally. A powder-spraying box (29) is fixedly connected to the other end of the platform (36) near the hydraulic expansion tube (38). The powder-spraying box (29) is located above the hydraulic expansion tube (38), and the bottom of the powder-spraying box (29) is provided with powder-dropping holes (33) corresponding to the position of each hydraulic expansion tube (38).

2. The apparatus for preparing bimetallic composite tubes according to claim 1, characterized in that: The powder-spreading box (29) has a funnel-shaped longitudinal section and an opening at the upper end.

3. The apparatus for preparing bimetallic composite tubes according to claim 1, characterized in that: The liquid distribution chamber (24) is fixed to the bottom of the feed platform (37), and a hydraulic booster system (25) connected to the liquid distribution chamber (24) is also fixed to the bottom of the feed platform (37).

4. The apparatus for preparing bimetallic composite tubes according to claim 1, characterized in that: The fixed-distance positioning device (40) includes a base (1), a positioning platform (2) that is vertically raised and lowered on the base (1), and several positioning grippers (3) that are horizontally arranged side by side on the positioning platform (2). The base (1) is fixed with steel pipe support platforms (6) on both sides of the positioning platform (2). Each steel pipe support platform (6) has a vertically lifting fixed platform (4) on one side. The fixed platform (4) has a swinging fixed claw (5) hinged to each positioning claw (3).

5. The apparatus for preparing bimetallic composite tubes according to claim 4, characterized in that: The positioning platform (2) is provided with a positioning mounting groove (15). Each positioning gripper (3) includes two arc-shaped claws (16) that are hinged to each other in the positioning mounting groove (15). The two arc-shaped claws (16) move towards each other or in opposite directions through a driving structure.

6. The apparatus for preparing a bimetallic composite tube according to claim 5, characterized in that: The driving structure includes a support frame (20) fixedly connected to the bottom of the positioning platform (2). A driving cylinder (21) is vertically fixedly connected to each positioning claw (3) on the support frame (20). A driving plate (17) is horizontally fixedly connected to the upper end of the driving cylinder (21). An extension section is fixedly connected to the hinge end of the arc claw (16). A rectangular sliding hole (18) is provided on the extension section. A driving column (19) is fixedly connected to both ends of the driving plate (17) and is slidably constrained in the two rectangular sliding holes (18).

7. The apparatus for preparing bimetallic composite tubes according to claim 4, characterized in that: The fixed-distance platform (4) is provided with a fixed-distance mounting groove (12). The fixed-distance claw (5) includes a pressing plate (10) hinged in the fixed-distance mounting groove (12). A baffle (11) is vertically fixed to the hinge end of the pressing plate (10). The weight of the baffle (11) is greater than the weight of the pressing plate (10). Under normal conditions, the baffle (11) is located in the fixed-distance mounting groove (12), and the pressing plate (10) extends out of the fixed-distance mounting groove (12).

8. The apparatus for preparing a bimetallic composite tube according to claim 7, characterized in that: A limiting plate (13) is fixedly attached to the side wall of the pressing plate (10). Under normal conditions, the lower end of the limiting plate (13) abuts against the upper edge of the fixed-distance mounting groove (12).

9. The apparatus for preparing a bimetallic composite tube according to claim 7, characterized in that: When the steel pipe (9) presses down the pressing plate (10), the pressing plate (10) is located in the fixed-distance mounting groove (12), the baffle (11) extends out of the fixed-distance mounting groove (12), and the fixed-distance platform (4) is located at the top of one end near the pressing plate (10) with a positioning column (8) vertically fixed.

10. The apparatus for preparing a bimetallic composite tube according to claim 5, characterized in that: The base has C-shaped guide frames fixed to both ends corresponding to the fixed-distance platform, and the ends of the fixed-distance platform are in frictional contact with the inner wall of the guide frames.

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