A polishing device and method for processing a bimetallic composite pipe

Abstract

The embodiment of the present disclosure relates to the technical field of pipe polishing, and provides a polishing device and method for processing bimetal composite pipes, the polishing device comprising: a rack; a rotating conveying assembly arranged on the rack and having a rotating conveying space for accommodating an outer pipe and an inner pipe, the rotating conveying space having a central axis and being configured to be capable of rotatingly conveying the outer pipe and the inner pipe; an outer wall polishing disc arranged on one side of the rotating conveying space and being configured to be capable of polishing the outer wall of the outer pipe and the inner pipe; and an inner wall polishing disc rotationally arranged in the rotating conveying space and located on one side of the outer wall polishing disc, a roller shaft of the inner wall polishing disc being coaxially arranged with the central axis of the rotating conveying space. Through the above technical solution, the technical problem of low polishing efficiency caused by polishing the inner and outer walls of the outer pipe and the inner pipe of the bimetal composite pipe in two processes is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of pipe polishing technology, and more specifically, to a polishing apparatus and method for processing bimetallic composite pipes. Background Technology

[0002] Bimetallic composite pipes are mainly manufactured through two major processes: composite molding and subsequent finishing. The core is to firmly bond two different metal pipes, balancing the strength of the base material with the corrosion resistance of the cladding. Composite molding is the key step in bimetallic composite pipe manufacturing, with the mainstream processes being mechanical and metallurgical composite processes. Mechanical composite processes use physical force to tightly bond the two pipes together. Common methods include "diameter reduction composite," which uses a mold to reduce the diameter of the outer base material, or "diameter expansion composite," which expands the diameter of the inner cladding material, creating an interference fit and forming a mechanical bond. Before using mechanical composite processes, the pipes need to be polished. In existing technologies, when polishing the inner and outer pipes of bimetallic composite pipes, whether polishing the inner or outer pipe, the inner and outer walls are usually polished independently, requiring two polishing processes, resulting in low polishing efficiency. Summary of the Invention

[0003] To overcome the above-mentioned defects, the embodiments of this disclosure provide a polishing apparatus and method for processing bimetallic composite tubes, which solves the technical problem that the inner and outer walls of the inner and outer tubes of bimetallic composite tubes are polished in two separate processes in the prior art, resulting in low polishing efficiency.

[0004] According to one aspect, at least one embodiment of this disclosure provides a polishing apparatus for processing bimetallic composite tubes, used to polish the inner and outer tubes of a bimetallic composite tube, comprising: frame; A rotary conveying assembly, disposed on the frame, having a rotary conveying space for accommodating an outer tube and an inner tube, the rotary conveying space having a central axis and configured to rotary convey the outer tube and the inner tube; An outer wall polishing disc is disposed on one side of the rotary conveying space and is configured to polish the outer walls of the outer tube and the inner tube. An inner wall polishing disc is rotatably disposed in the rotating conveying space and located on one side of the outer wall polishing disc. The roller shaft of the inner wall polishing disc is coaxially disposed with the central axis of the rotating conveying space.

[0005] For example, a polishing apparatus for processing bimetallic composite tubes provided in at least one embodiment of this disclosure further includes: A support member, disposed at the downstream end of the rotary conveyor assembly, has a perforation through which the roller of the inner wall polishing disc passes and has an annular gap between itself and the inner wall of the perforation for the passage of the inner and outer tubes.

[0006] For example, a polishing apparatus for processing bimetallic composite tubes provided in at least one embodiment of this disclosure further includes: A rotary drive component, used to drive the inner wall polishing disc to rotate, is disposed on the side of the support member away from the rotary conveying assembly. The rotary drive component is movable, with the direction of movement perpendicular to the axial direction of the perforation. It is configured to have at least a driven polishing state and a discharge clearance state. In the driven polishing state, the drive shaft of the rotary drive component is coaxial with the perforation. In the discharge clearance state, the rotary drive component is moved away from the perforation to a clearance position so that the inner and outer tubes in the perforation can be conveyed downstream.

[0007] For example, at least one embodiment of this disclosure provides a polishing apparatus for processing bimetallic composite tubes, wherein the inner wall of the perforation has an annular limiting groove, the roller of the inner wall polishing disc has an annular limiting protrusion, the annular limiting protrusion can be accommodated in the annular limiting groove, and the diameter of the annular limiting protrusion is smaller than the diameter of the perforation so that the inner tube and the outer tube can pass through.

[0008] For example, at least one embodiment of this disclosure provides a polishing apparatus for processing bimetallic composite tubes, wherein the annular limiting protrusion has a tapered guide surface on the side near the rotary conveying assembly, the tapered guide surface being used to guide the inner tube and the outer tube through the annular gap.

[0009] For example, at least one embodiment of this disclosure provides a polishing apparatus for processing bimetallic composite tubes, wherein the roller shaft of the inner wall polishing disc has a prismatic connecting portion at one end near the rotation drive member, and further includes a quick-connect assembly, the quick-connect assembly comprising: A quick-connect connector is disposed on the drive shaft of the rotating drive component. When the rotating drive component is in the driving polishing state, the quick-connect connector is connected to the prismatic connecting part. When the rotating drive component is in the material discharge clearance state, the quick-connect connector is disconnected from the prismatic connecting part.

[0010] For example, at least one embodiment of this disclosure provides a polishing apparatus for processing bimetallic composite tubes, wherein the quick-connect fitting has a prismatic connecting groove, one side of which has an inlet for the prismatic connecting portion to enter, and the quick-connect assembly further includes: The sliding stop is slidably provided on both sides of the inlet. The sliding stop is used to block the prismatic connecting part to prevent it from coming out of the prismatic connecting groove. A first elastic element, one end of which acts on the sliding stop and the other end of which acts on the quick-connect fitting, is used to provide the sliding stop with force to block the prismatic connection portion.

[0011] For example, at least one embodiment of this disclosure provides a polishing apparatus for processing bimetallic composite tubes, wherein the sliding stop has a first guide slope on both sides and the prismatic connecting part has a second guide slope on both sides, and the first guide slope and the second guide slope are used to guide the prismatic connecting part into and out of the prismatic connecting groove.

[0012] For example, at least one embodiment of this disclosure provides a polishing apparatus for processing bimetallic composite tubes, wherein the inner wall polishing disc includes: A roller body having a plurality of circumferentially arranged guide grooves; A sliding block is slidably disposed in each of the guide grooves; A polishing component, disposed at the end of the sliding block, is used for polishing the inner wall of the outer tube and the inner wall of the inner tube; The second elastic element has one end acting on the sliding block and the other end acting on the bottom of the guide groove, and is used to provide the sliding block with a force away from the bottom of the guide groove.

[0013] According to another aspect, at least one embodiment of this disclosure provides a polishing method for processing bimetallic composite tubes, utilizing the aforementioned polishing apparatus for processing bimetallic composite tubes, comprising the following steps: S1. The rotary conveying assembly sequentially conveys the inner tube and outer tube of the bimetallic composite tube; S2. After the outer wall polishing disc and the inner wall polishing disc polish the outer wall and the inner wall of the outer tube at the same time, the outer wall and the inner wall of the inner tube are polished at the same time. S3. The inner tube with its outer and inner walls polished is fed into the outer tube with its outer and inner walls polished by the rotary conveying assembly.

[0014] The beneficial effects of the embodiments disclosed herein are as follows: In this disclosure, the polishing device can simultaneously polish the inner and outer walls of the inner or outer tube of a bimetallic composite pipe. Compared with the prior art, which can only polish the inner or outer wall, this greatly saves polishing time and improves production efficiency. By using a rotary conveying assembly to transport the pipe while it rotates, and coordinating with the synchronous operation of the inner and outer wall polishing discs, efficient continuous polishing operations are achieved. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0016] Figure 1This is a schematic diagram of the polishing apparatus for processing bimetallic composite tubes in one embodiment of this disclosure; Figure 2 for Figure 1 Another perspective structural schematic diagram of the polishing device for processing bimetallic composite tubes in the embodiment; Figure 3 for Figure 1 A top view of the polishing apparatus for processing bimetallic composite tubes in the embodiment; Figure 4 for Figure 3 Schematic diagram of the AA structure; Figure 5 for Figure 4 A magnified schematic diagram of the middle D section; Figure 6 for Figure 3 Schematic diagram of the BB structure; Figure 7 for Figure 6 A magnified schematic diagram of the central part of E; Figure 8 for Figure 3 Schematic diagram of CC structure; Figure 9 for Figure 8 A partially enlarged structural diagram of the middle F section; In the figure: frame 100, rotary conveyor assembly 200, rotary conveyor space 210, rotary roller 220, travel drive wheel 230, outer wall polishing disc 300, inner wall polishing disc 400, roller shaft 410, annular limiting flange 411, conical guide surface 412, prismatic connecting part 413, second guide slope 414, roller body 420, guide groove 421, sliding block 430, polishing part 440, second elastic element 450, support part 500, perforation 510, annular limiting groove 511, drive motor 600, quick-connect assembly 700, quick-connect connector 710, prismatic connecting groove 711, inlet 712, sliding stop 720, first guide slope 721, first elastic element 730. Detailed Implementation

[0017] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0018] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0020] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] like Figures 1-9The diagram illustrates a polishing apparatus for processing bimetallic composite tubes according to an embodiment of the present disclosure. The apparatus is used to polish the inner and outer tubes of a bimetallic composite tube. It includes a frame 100, a rotary conveying assembly 200, an outer wall polishing disc 300, and an inner wall polishing disc 400. The rotary conveying assembly 200 is mounted on the frame 100 and has a rotary conveying space 210 for accommodating the outer and inner tubes. The rotary conveying space 210 has a central axis and is configured to rotary convey the outer and inner tubes. The outer wall polishing disc 300 is disposed on one side of the rotary conveying space 210 and is configured to polish the outer walls of the outer and inner tubes. The inner wall polishing disc 400 is rotatably disposed in the rotary conveying space 210 and located on one side of the outer wall polishing disc 300. The roller shaft 410 of the inner wall polishing disc 400 is coaxially arranged with the central axis of the rotary conveying space 210.

[0024] In some examples, a support 500 is also included, which is disposed at the downstream end of the rotary conveyor assembly 200 and has a perforation 510 through which the roller 410 of the inner wall polishing disc 400 passes and has an annular gap between it and the inner wall of the perforation 510 for the passage of the inner and outer tubes.

[0025] In some examples, a rotation drive 600 is also included, which drives the inner wall polishing disc 400 to rotate. The rotation drive 600 is located on the side of the support 500 away from the rotary conveyor assembly 200. The rotation drive 600 is movable in a direction perpendicular to the axial direction of the perforation 510 and is configured to have at least a driven polishing state and a discharge clearance state. In the driven polishing state, the drive shaft of the rotation drive 600 is coaxial with the perforation 510. In the discharge clearance state, the rotation drive 600 is moved away from the perforation 510 to allow the inner and outer tubes in the perforation 510 to be conveyed downstream.

[0026] For example, the frame 100, as the basic support structure of the entire polishing device, has sufficient strength and stability to support components such as the rotary conveyor assembly 200, the outer wall polishing disc 300, and the inner wall polishing disc 400, as well as various forces generated during the polishing process.

[0027] The rotary conveyor assembly 200 is mounted on the frame 100 and has a rotary conveying space 210 for accommodating the outer and inner tubes. The rotary conveyor assembly 200 mainly consists of a drive mechanism, a rotating shaft, and multiple rollers. The drive mechanism can be a combination of a motor and a reducer. The motor provides power, and the reducer converts the high-speed rotation of the motor into a suitable low-speed, high-torque output, driving the rotating shaft to rotate. Driven by the rollers, the outer and inner tubes move in a circular motion around this central axis, achieving a simultaneous rotating and forward conveying action, providing suitable motion conditions for subsequent polishing operations.

[0028] The outer wall polishing disc 300 is positioned on one side of the rotary conveying space 210, with its surface facing the outer wall of the pipe within the space. The outer wall polishing disc 300 consists of a polishing disc body, a drive motor, and a connecting shaft. The polishing disc body is made of alloy material, with sandpaper or other polishing materials adhered to its surface for grinding and polishing the outer wall of the pipe. The drive motor provides rotational power to the polishing disc body, and the rotation is transmitted to the polishing disc body via the connecting shaft, causing it to rotate at high speed.

[0029] The inner wall polishing disc 400 is rotatably disposed within the rotary conveying space 210 and located on one side of the outer wall polishing disc 300. The roller shaft 410 of the inner wall polishing disc 400 is coaxially arranged with the central axis of the rotary conveying space 210. The inner wall polishing disc 400 is adapted to the inner wall of the pipe, and sandpaper or polishing material suitable for inner wall polishing is adhered to its surface, thereby uniformly polishing the inner wall of the pipe.

[0030] The support member 500 is located at the downstream end of the rotary conveying assembly 200. Downstream specifically refers to the direction in which the inner and outer tubes are conveyed; that is, downstream refers to the conveying direction of the tubes. The support member 500 serves to support the inner wall polishing disc 400 and the roller 410, and guide the tubes out of the assembly. The support member 500 has a through hole 510 through which the roller 410 of the inner wall polishing disc 400 passes, and an annular gap exists between the roller 410 and the inner wall of the through hole 510 for the passage of the inner and outer tubes.

[0031] The inner wall of the perforation 510 is precision machined to have a low surface roughness, thereby reducing friction when the pipe passes through. Additionally, chamfers can be provided at the edges of the perforation 510 to facilitate smooth entry of the pipe.

[0032] A rotary drive unit 600 is used to drive the inner wall polishing disc 400 to rotate. It is also driven by a motor and is located on the side of the support unit 500 away from the rotary conveyor assembly 200. The rotary drive unit 600 can move via a guide rail slider mechanism, with the direction of movement perpendicular to the axial direction of the perforation 510. The rotary drive unit 600 has at least two states: a polishing drive state and a discharge clearance state.

[0033] In the polishing state, the drive shaft of the rotary drive 600 is coaxial with the perforation 510. At this time, the drive shaft is connected to the roller shaft 410 of the inner wall polishing disc 400, providing rotational power to the inner wall polishing disc 400. In the discharge clearance state, the rotary drive 600 moves along the guide rail away from the perforation 510, clearing space so that the inner and outer tubes in the perforation 510 can be conveyed downstream. The movement of the rotary drive 600 can be achieved manually or electrically. For example, an operating handle can be installed on the frame 100 to control the movement of the rotary drive 600; or an electric push rod can be combined with a control system to automatically control the movement of the rotary drive 600 according to a preset program.

[0034] The rotary conveyor assembly 200 drives a rotating shaft via a motor and a reducer, which in turn drives multiple rollers to rotate. The outer and inner tubes are placed on the rollers, and due to the friction on the roller surfaces, they move in a circular motion around the central axis within the rotary conveyor space 210. Simultaneously, they are conveyed forward under the push of the rollers, achieving a motion mode of simultaneous rotation and conveying. This provides the necessary conditions for the outer wall polishing disc 300 and the inner wall polishing disc 400 to uniformly polish the inner and outer walls of the tubes.

[0035] The outer wall polishing disc 300 is driven by a motor to rotate at high speed. The polishing material on the surface of the disc comes into contact with the outer wall of the rotating pipe, and the outer wall of the pipe is polished by friction. The inner wall polishing disc 400 can also rotate at high speed. Since its roller 410 is coaxial with the rotation center axis of the pipe, the inner wall polishing disc 400 can uniformly polish the inner wall of the pipe as the pipe rotates. This design of polishing the inner and outer walls simultaneously changes the existing technology of polishing the inner and outer pipes independently, greatly improving polishing efficiency.

[0036] The rotary drive 600 moves perpendicular to the axial direction of the perforation 510 via a guide rail slider mechanism. In the polishing drive state, the drive shaft of the rotary drive 600 is coaxial with the perforation 510 and connected to the roller shaft 410 of the inner wall polishing disc 400, providing rotational power to the inner wall polishing disc 400 to polish the inner wall of the pipe. When the pipe polishing is complete and discharge is required, the rotary drive 600 moves to the discharge clearance position, making way for the perforation 510, allowing the inner and outer pipes to be smoothly conveyed downstream. This achieves functional switching of the drive motor at different working stages, ensuring the continuity and efficiency of the polishing device.

[0037] Before polishing, adjust the rotary drive 600 to the polishing drive state, ensuring that its drive shaft is coaxial with the perforation 510 and tightly connected to the roller shaft 410 of the inner wall polishing disc 400. Set appropriate speeds on the drive motors of the outer wall polishing disc 300 and the inner wall polishing disc 400, determining the polishing speed based on factors such as the material and diameter of the pipe. Place the outer and inner tubes of the bimetallic composite pipe to be polished sequentially within the rotary conveying space 210 of the rotary conveying assembly 200, ensuring the pipes are centered on the rollers.

[0038] During polishing, the drive motor of the rotary conveyor assembly 200 is activated. The motor drives the reducer, which in turn drives the rotating shaft to rotate, thereby rotating the rollers. This causes the outer and inner tubes to begin rotating and being conveyed forward within the rotary conveyor space 210. Simultaneously, the drive motors of the outer wall polishing disc 300 and the inner wall polishing disc 400 are activated. The polishing disc body of the outer wall polishing disc 300 rotates at high speed, grinding and polishing the outer walls of the outer and inner tubes during rotary conveying. The polishing disc body of the inner wall polishing disc 400 rotates at high speed under the drive of the rotary drive component 600, polishing the inner wall of the tube as it rotates. During the polishing process, the operator can observe the polishing condition of the tube and fine-tune the position of the outer wall polishing disc 300 by adjusting the mechanism to ensure that it maintains appropriate contact pressure and distance with the outer wall of the tube to achieve the best polishing effect.

[0039] After the inner or outer tube of the bimetallic composite pipe has been polished in the polishing area, the control rotation drive 600 moves along the guide rail away from the perforation 510, putting it into the discharge clearance state and clearing the position of the perforation 510. The rotary conveyor assembly 200 continues to work, conveying the polished inner or outer tube downstream through the perforation 510, completing the discharge process. After discharge, the rotation drive 600 is readjusted to the driving polishing state, preparing for the polishing operation of the next batch of pipes.

[0040] This polishing device can simultaneously polish the inner and outer walls of either the inner or outer tube of a bimetallic composite pipe. Compared to existing technologies that can only polish the inner or outer wall, this significantly saves polishing time and improves production efficiency. The rotating conveyor assembly 200 allows the pipe to rotate and be conveyed simultaneously, and the synchronized operation of the inner and outer polishing discs enables highly efficient continuous polishing.

[0041] The design of the outer wall polishing disc 300 and the inner wall polishing disc 400 enables the inner and outer walls of the pipe to be polished uniformly. The roller 410 of the inner wall polishing disc 400 is coaxially arranged with the central axis of the rotating conveying space 210, ensuring that the inner wall can be polished uniformly during the rotation of the pipe, avoiding the problem of insufficient or excessive polishing in certain areas, and ensuring the polishing quality of the bimetallic composite pipe.

[0042] The perforation 510 on the support 500 provides a channel for the pipe to exit. The design of the rotating drive 600, which switches between the polishing state and the exit clearance state, allows the pipe to exit smoothly after polishing, and the operation is simple and convenient. Whether operated manually or electrically controlled, the movement of the rotating drive 600 can be quickly switched between different working states, improving the practicality and work efficiency of the equipment.

[0043] In some examples, the inner wall of the perforation 510 has an annular limiting groove 511, and the roller 410 of the inner wall polishing disc 400 has an annular limiting flange 411. The annular limiting flange 411 can be accommodated within the annular limiting groove 511, and the diameter of the annular limiting flange 411 is smaller than the diameter of the perforation 510, allowing the inner and outer tubes to pass through. The side of the annular limiting flange 411 near the rotary conveying assembly 200 has a tapered guide surface 412, which guides the inner and outer tubes through the annular gap.

[0044] For example, the annular limiting groove 511 on the inner wall of the perforation 510 is a groove opened around the circumference of the perforation 510. Its width is designed according to the size of the annular limiting protrusion 411 on the inner wall polishing disc 400 roller shaft 410, and is generally slightly wider than the width of the annular limiting protrusion 411 to ensure that the annular limiting protrusion 411 can rotate freely within the annular limiting groove 511, while effectively limiting the axial displacement of the roller shaft 410 within the perforation 510, ensuring the stability of the inner wall polishing disc 400 roller shaft 410 and preventing axial movement.

[0045] The annular limiting flange 411 is a circumferential protrusion on the roller 410 that matches the annular limiting groove 511 on the inner wall of the perforation 510. Its diameter is smaller than the diameter of the perforation 510, thus forming an annular gap for the inner and outer tubes to pass through. The width of the annular limiting flange 411 is adapted to the width of the annular limiting groove 511 to ensure its structural strength.

[0046] It should be noted that the support and limiting of the roller 410 in the driving polishing state and the discharge clearance state, especially in the discharge clearance state, are achieved by the limiting of the annular limiting protrusion 411 in the annular limiting groove 511. The annular limiting protrusion 411 is restricted to slide up and down in the annular limiting groove 511, but cannot move left and right. This can prevent the annular limiting protrusion 411 from coming out of the annular limiting groove 511. The roller 410 parts on both sides of the annular limiting protrusion 411 are also supported by the perforation 510, thus realizing the support of the roller 410 in the discharge clearance state.

[0047] A tapered guide surface 412 is located on the side of the annular limiting flange 411 near the rotary conveying assembly 200, and is shaped like a truncated cone. The diameter of its large end is the same as the diameter of the annular limiting flange 411, and the diameter of its small end is designed according to the minimum outer diameter of the inner and outer tubes to ensure that the inner and outer tubes can pass smoothly. This effectively guides the inner and outer tubes through the annular gap without affecting the structural strength of the annular limiting flange 411 and the stability of its fit with the annular limiting groove 511 due to excessive taper.

[0048] When the inner or outer tube moves toward the perforation 510 driven by the rotary conveying assembly 200, the tapered guide surface 412 first contacts the tube. Due to its tapered structure, it can guide the tube, making it easier to align with the annular gap, reducing deviation and jamming when the tube enters the perforation 510, ensuring that the tube can pass through the perforation 510 smoothly, and improving the working efficiency and stability of the polishing device.

[0049] By providing an annular limiting groove 511 on the inner wall of the perforation 510, which cooperates with the annular limiting flange 411 on the inner wall polishing disc 400 and the roller shaft 410, it can be ensured that the inner wall polishing disc 400 and the roller shaft 410 will not move axially. When the rotating drive 600 changes from the discharge clearance state to the drive polishing state, it can be conveniently and accurately connected to the roller 410. If the roller 410 can move axially, the rotating drive 600 may not be able to align with the end of the roller 410 for connection.

[0050] The tapered guide surface 412 on the annular limiting flange 411 utilizes its tapered structure to guide the pipe accurately into the annular gap when it approaches the perforation 510. The design of the tapered guide surface 412 fully considers the size range and movement trajectory of the pipe. Through reasonable tapering and diameter design, it effectively prevents the pipe from being blocked by the annular limiting flange 411 and thus unable to pass through the annular gap.

[0051] When the inner or outer tube of the bimetallic composite pipe moves towards the support 500 under the drive of the rotary conveyor assembly 200, the pipe first contacts the tapered guide surface 412 of the annular limiting flange 411. The tapered structure of the tapered guide surface 412 guides the pipe to gradually align with the annular gap between the perforation 510 and the roller 410. During this process, the rotary conveyor assembly 200 continuously provides power, keeping the pipe rotating and conveyed forward. When the pipe has completed inner wall polishing and needs to pass through the perforation 510, the drive motor 600 switches to the discharge clearance state, clearing the position of the perforation 510. The rotary conveyor assembly 200 continues to work, conveying the polished inner and outer tubes downstream to complete the discharge process.

[0052] The tapered guide surface 412 on the annular limiting flange 411 optimizes the smoothness of the inner and outer tubes passing through the perforation 510. It guides the tube accurately into the annular gap, reducing potential jamming or misalignment when the tube enters the perforation 510, thus improving equipment efficiency and reliability. Especially in continuous polishing operations, this guiding structure ensures continuous tube delivery, reducing downtime caused by poor tube passage and improving production efficiency.

[0053] In some examples, the roller 410 of the inner wall polishing disc 400 has a prismatic connecting portion 413 at one end near the rotation drive 600, and also includes a quick-connect assembly 700, which includes a quick-connect connector 710: the quick-connect connector 710 is disposed on the drive shaft of the rotation drive 600 and is configured such that when the rotation drive 600 is in the driving polishing state, the quick-connect connector 710 is connected to the prismatic connecting portion 413, and when it is in the discharge clearance state, the quick-connect connector 710 is disconnected from the prismatic connecting portion 413.

[0054] In some examples, the quick-connect connector 710 has a prismatic connection groove 711, with an inlet 712 on one side of the prismatic connection groove 711 for the prismatic connection part 413 to enter the prismatic connection groove 711. The quick-connect assembly 700 also includes a sliding stop 720 and a first elastic member 730. The sliding stop 720 is slidably disposed on both sides of the inlet 712. The sliding stop 720 is used to block the prismatic connection part 413 to prevent it from coming out of the prismatic connection groove 711. One end of the first elastic member 730 acts on the sliding stop 720 and the other end acts on the quick-connect connector 710 to provide the force for the sliding stop 720 to block the prismatic connection part 413.

[0055] In some examples, the sliding stop 720 has a first guide slope 721 on both sides, and the prismatic connecting part 413 has a second guide slope 414 on both sides. The first guide slope 721 and the second guide slope 414 are used to guide the prismatic connecting part 413 into and out of the prismatic connecting groove 711.

[0056] For example, the prismatic connecting portion 413 is located at one end of the roller 410 near the rotary drive 600 and has a prism-like structure, such as a square prism or a hexagonal prism. Its dimensions are designed according to the drive shaft torque of the rotary drive 600 and the driving torque required by the inner wall polishing disc 400.

[0057] The quick-connect connector 710 is mounted on the drive shaft of the rotary drive component 600 and is securely connected to the drive shaft by means of key connection or interference fit, ensuring that no relative displacement occurs during rotation.

[0058] The quick-connector 710 has a prismatic connecting groove 711 that matches the prismatic connecting portion 413. The dimensions of the prismatic connecting groove 711 match those of the prismatic connecting portion 413, ensuring a tight fit and effective torque transmission. An inlet 712 is provided on one side of the prismatic connecting groove 711. The width of the inlet 712 is slightly larger than one end of the prismatic connecting portion 413, facilitating the entry of the prismatic connecting portion 413 into the prismatic connecting groove 711. The edges of the inlet 712 are chamfered to guide the prismatic connecting portion 413 smoothly into the groove.

[0059] Sliding stops 720 are slidably provided on both sides of the inlet 712. The sliding stops 720 adopt a rectangular block structure, and their length and width are designed according to the dimensions of the inlet 712, possessing a certain length. A slider is provided at the bottom of the sliding stops 720, which cooperates with the sliding groove on the quick-connect connector 710 to allow the sliding stops 720 to slide on the quick-connect connector 710. The length of the sliding groove is designed according to the stroke requirements of the sliding stops 720, ensuring that the sliding stops 720 can effectively block the prismatic connecting part 413, preventing it from dislodging from the prismatic connecting groove 711.

[0060] Both sides of the sliding stop 720 have a first guide slope 721. The first guide slope 721 has a certain inclination angle, which can effectively guide the prismatic connecting part 413 into and out of the prismatic connecting groove 711, and also ensure that the sliding stop 720 has sufficient stability when blocking the prismatic connecting part 413.

[0061] The first elastic element 730 can be a spring, with one end abutting against the sliding stop 720 and the other end abutting against the corresponding mounting point on the quick-connect connector 710. When the rotary drive 600 is in the driving polishing state, the elastic force of the first elastic element 730 causes the sliding stop 720 to tightly block the prismatic connecting part 413, preventing it from coming out of the prismatic connecting groove 711, ensuring a reliable connection between the quick-connect connector 710 and the prismatic connecting part 413, thereby achieving stable driving of the rotary drive 600 on the inner wall polishing disc 400. When the rotary drive 600 needs to switch to the discharge clearance state, external force overcomes the elastic force of the first elastic element 730, causing the sliding stop 720 to slide away from the prismatic connecting groove 711, releasing the obstruction of the prismatic connecting part 413, and achieving separation of the quick-connect connector 710 and the prismatic connecting part 413.

[0062] The quick-connector 710 uses a prismatic connecting groove 711 on its quick-connect head 710 to engage with a prismatic connecting portion 413 on the inner wall polishing disc 400 roller shaft 410, enabling a rapid connection between the rotary drive 600 and the inner wall polishing disc 400. During polishing, the prismatic connecting portion 413 is inserted into the prismatic connecting groove 711, and the sliding stop 720, under the action of the first elastic element 730, blocks the prismatic connecting portion 413, preventing it from dislodging and ensuring reliable connection. When material discharge is required, the sliding stop 720 overcomes the elastic force of the first elastic element 730, causing it to slide and separating the prismatic connecting portion 413 from the prismatic connecting groove 711, achieving rapid separation and facilitating pipe discharge.

[0063] The first guide slope 721 of the sliding stop 720 cooperates with the second guide slope 414 of the prismatic connecting part 413 to guide the prismatic connecting part 413 as it enters and exits the prismatic connecting groove 711. When the prismatic connecting part 413 is inserted into the prismatic connecting groove 711, the second guide slope 414 contacts the first guide slope 721, guiding the sliding stop 720 to slide to both sides against the elastic force of the first elastic member 730, allowing the prismatic connecting part 413 to smoothly enter the prismatic connecting groove 711. When separation is required, the guide slopes also facilitate the prismatic connecting part 413 to disengage from the prismatic connecting groove 711, improving the convenience and stability of the connection and separation process.

[0064] When the rotary drive 600 is in the polishing drive state, the operator pushes the rotary drive 600 closer to the roller 410 of the inner wall polishing disc 400. The prismatic connecting groove 711 on the quick-connect connector 710 aligns with the prismatic connecting part 413. As the rotary drive 600 approaches, the prismatic connecting part 413 gradually inserts into the prismatic connecting groove 711. During insertion, the second guide slope 414 of the prismatic connecting part 413 contacts the first guide slope 721 of the sliding stop 720, pushing the sliding stop 720 to slide to both sides against the elastic force of the first elastic member 730. When the prismatic connecting part 413 is fully inserted into the prismatic connecting groove 711, the sliding stop 720 returns to its original position under the elastic force of the first elastic member 730, blocking the prismatic connecting part 413 and completing the connection process. At this time, the drive shaft of the rotating drive 600 is connected to the prismatic connection part 413 through the quick connector 710, which drives the inner wall polishing disc 400 to rotate and polish the inner wall of the pipe.

[0065] When the pipe polishing is complete and discharge is required, the rotary drive 600 switches to the discharge clearance state. The operator uses a control mechanism, such as a manual or electric push rod, to move the rotary drive 600 away from the inner wall polishing disc 400. During this movement, the second guide slope 414 of the prismatic connection 413 contacts the first guide slope 721 of the sliding stop 720 again, pushing the sliding stop 720 to overcome the elastic force of the first elastic member 730 and slide to both sides, allowing the prismatic connection 413 to smoothly disengage from the prismatic connection groove 711. As the rotary drive 600 moves further, the quick-connect fitting 710 completely separates from the prismatic connection 413, clearing the position of the perforation 510, and the pipe is conveyed downstream by the rotary conveying assembly 200.

[0066] After the material is discharged, the rotating drive 600 moves closer to the roller 410 of the inner wall polishing disc 400, repeating the above-mentioned drive polishing state connection process, realizing the reconnection of the quick connector 710 and the prismatic connector 413, and preparing for the next round of inner wall polishing operation of the pipe.

[0067] It should be noted that, regardless of whether the inner wall polishing disc 400 is in the driving polishing state or the discharge clearance state, it is necessary to ensure that the roller 410 of the inner wall polishing disc 400 does not move axially, thereby preventing the inner wall polishing disc 400 from moving and ensuring proper positioning. In the driving polishing state, the roller 410 is connected to the rotating drive component 600 through the quick-connect connector 710, so radial movement is not allowed. In the discharge clearance state, during the discharge of the inner and outer tubes, a clamp can be added to hold the inner wall polishing disc 400 to limit its axial movement. After the inner and outer tubes are discharged, the annular limiting protrusion 411 of the roller 410 will move down to the annular limiting groove 511 under its own gravity. At this time, the clamp no longer holds the roller 410, and the roller 410 will not move radially.

[0068] The quick-connect assembly 700 enables rapid connection and disconnection between the rotary drive component 600 and the inner polishing disc 400, eliminating the need for complex disassembly and installation steps and significantly improving equipment operating efficiency. During pipe polishing and unloading, the working state of the rotary drive component 600 can be quickly switched, reducing equipment downtime and increasing production efficiency.

[0069] The precise fit between the prismatic connecting part 413 and the prismatic connecting groove 711, and the effective blocking of the prismatic connecting part 413 by the sliding stop 720 under the action of the first elastic member 730, ensure the reliability of the connection between the rotating drive member 600 and the inner wall polishing disc 400 in the driving polishing state. This ensures stable torque transmission, preventing the inner wall polishing disc 400 from loosening or slipping during polishing, thus improving polishing quality and equipment operational stability.

[0070] The cooperation between the first guide slope 721 of the sliding stop 720 and the second guide slope 414 of the prismatic connecting part 413 provides good guidance for the prismatic connecting part 413 to enter and exit the prismatic connecting groove 711. This makes the connection and separation process smoother, reduces the difficulty of operation for operators, and also reduces the risk of component damage caused by improper connection or separation, thus extending the service life of the equipment.

[0071] In some examples, the inner wall polishing disc 400 includes a roller body 420, a sliding block 430, a polishing element 440, and a second elastic element 450. The roller body 420 has a plurality of circumferentially arranged guide grooves 421. A sliding block 430 is slidably disposed in each guide groove 421. The polishing element 440 is disposed at the end of the sliding block 430 and is used for polishing the inner wall of the outer tube and the inner wall of the inner tube. One end of the second elastic element 450 acts on the sliding block 430 and the other end acts on the bottom of the guide groove 421 to provide a force for the sliding block 430 to move away from the bottom of the guide groove 421.

[0072] For example, the roller 420 is cylindrical and made of high-strength aluminum alloy, which is lightweight and high-strength, effectively reducing rotational inertia and facilitating high-speed rotation by the drive motor 600. The roller 420 has a certain length to ensure that the inner polishing disc 400 can correspond to a certain area of ​​the inner wall of the tube during the polishing process.

[0073] The roller body 420 has several circumferentially arranged guide grooves 421 on its surface. The number of guide grooves 421 is determined according to the diameter of the roller body 420 and the polishing requirements of the inner wall of the tube. The sliding block 430 can slide smoothly in the guide grooves 421, while its movement is limited to the limit.

[0074] The shape of the sliding block 430 is adapted to the guide groove 421. The sliding block 430 is slidably disposed in the guide groove 421, and its two sides are tightly fitted with the inner wall of the guide groove 421. Through this matching method, the sliding block 430 can only slide away from the axial direction in the guide groove 421.

[0075] Polishing component 440 is disposed at the end of sliding ball bearing 430 and is used to polish the inner and outer walls of the bimetallic composite pipe. Polishing component 440 can be made of materials such as sandpaper, scouring pad, or polyurethane polishing pad, selected according to the pipe material and the required polishing precision. Polishing component 440 is fixed to the end of sliding ball bearing 430 by means of adhesive, bolt connection, or snap-fit, ensuring it will not fall off during high-speed rotation and polishing.

[0076] The shape of the polished part 440 is designed according to the shape of the inner wall of the pipe. It is generally arc-shaped, and its curvature matches the curvature of the inner wall of the pipe to ensure full contact with the inner wall of the pipe.

[0077] The second elastic element 450 can be a spring, with one end abutting against the bottom surface of the sliding block 430 and the other end abutting against the bottom of the guide groove 421. It can provide sufficient force to move the sliding block 430 away from the bottom of the guide groove 421, so that the polished part 440 maintains appropriate contact pressure with the inner wall of the pipe.

[0078] When the inner polishing disc 400 rotates, centrifugal force causes the sliding block 430 to tend to move away from the center of the roller 420. At this time, the elastic force of the second elastic element 450 interacts with the centrifugal force, so that the polishing part 440 maintains a suitable contact pressure with the inner wall of the pipe. This dynamic pressure adjustment mechanism can adapt to the polishing requirements at different speeds and ensure the consistency of the polishing effect.

[0079] During the rotation of the inner wall polishing disc 400, the sliding block 430 is subjected to centrifugal force and slides outward within the guide groove 421. The second elastic element 450 provides a certain elastic force, ensuring that the polishing part 440 maintains appropriate contact pressure with the inner wall of the pipe. Since the centrifugal force is proportional to the square of the rotation speed, the centrifugal force changes accordingly when the rotation speed changes, and the position of the sliding block 430 within the guide groove 421 automatically adjusts. This allows the contact pressure between the polishing part 440 and the inner wall of the pipe to adapt to changes, ensuring good polishing results at different rotation speeds. More importantly, even if the pipe is rotating, the contact between the inner wall polishing disc 400 and the inner wall of the pipe will not fluctuate due to the rotation or a certain degree of shaking, thus preventing damage to the polishing effect or even the pipe. Furthermore, this structure ensures good polishing results even if there is a certain difference in the inner and outer diameters of the inner and outer pipes, avoiding the inability to simultaneously adapt to inner and outer pipes of different sizes.

[0080] Multiple circumferentially arranged sliding blocks 430 and polishing parts 440 rotate synchronously under the drive of roller 420, polishing the inner wall of the pipe in all directions. The guide groove 421 guides the sliding blocks 430, ensuring the stability of the polishing parts 440, and the contact pressure between each polishing part 440 and the inner wall of the pipe is uniform, thereby achieving uniform polishing of the inner wall of the pipe and avoiding the problem of local over-polishing or under-polishing.

[0081] Through the interaction between the second elastic element 450 and centrifugal force, the inner wall polishing disc 400 can automatically adjust the contact pressure between the polishing part 440 and the inner wall of the pipe according to the rotation speed, eliminating the need for frequent manual adjustments and improving polishing efficiency and quality. This adaptive pressure adjustment mechanism enables good polishing results at different rotation speeds, making it particularly suitable for polishing bimetallic composite pipes of different materials and diameters, thus enhancing the equipment's versatility.

[0082] Multiple circumferentially arranged sliding blocks 430 and polishing parts 440, along with the guide groove 421, guide the sliding blocks 430, ensuring uniform polishing of the inner wall of the pipe. The uniform contact pressure between each polishing part 440 and the inner wall of the pipe avoids the problem of excessive or insufficient polishing in certain areas, thus improving the surface quality and smoothness of the inner wall of the bimetallic composite pipe.

[0083] In some examples, the rotary conveyor assembly 200 includes a roller 220 and a driving wheel 230. The roller 220 is rotatably disposed on one side of the rotary conveyor space 210 and is parallel to the central axis of the rotary conveyor space 210. The driving wheel 230 is rotatably disposed on the other side of the rotary conveyor space 210. The axle of the driving wheel 230 is obliquely intersecting the central axis of the rotary conveyor space 210, and there are several driving wheels 230 arranged sequentially.

[0084] For example, the rotary roller 220 is cylindrical, providing sufficient support for the pipe. The rotary roller 220 is rotatably mounted on the frame 100 via bearing seats at both ends, located on one side of the rotary conveying space 210, with its axis parallel to the central axis of the rotary conveying space 210. The surface of the rotary roller 220 undergoes special treatment, such as knurling or the application of an anti-slip rubber layer. Knurling increases the friction between the rotary roller 220 and the pipe, making the pipe more stable and less prone to slippage during rotary conveying; the anti-slip rubber layer not only increases friction but also prevents scratches on the pipe surface, making it particularly suitable for bimetallic composite pipes with high surface quality requirements.

[0085] The drive wheel 230 is a circular wheel made of wear-resistant rubber or polyurethane material to provide good friction and cushioning performance. The diameter of the wheel is selected according to the height of the rotating conveying space 210 and the size of the pipe. The axle of the drive wheel 230 is oblique to the central axis of the rotating conveying space 210, with a certain tilt angle. This design allows the drive wheel 230 to generate a component force on the pipe along the axial direction of the rotating conveying space 210 when rotating, thereby propelling the pipe forward.

[0086] Several drive wheels 230 are arranged sequentially on the other side of the rotary conveying space 210. The distance between adjacent drive wheels 230 is set according to the length of the pipe and stability requirements. Each drive wheel 230 is mounted on a bracket via its axle, and the bracket is fixedly connected to the frame 100 to ensure the stability of the drive wheels 230 during operation. Simultaneously, the axles of the drive wheels 230 are driven by a drive motor, causing the drive wheels 230 to rotate.

[0087] The rotating roller 220 contacts the surface of the pipe. When the roller 220 rotates, it drives the pipe to rotate around the central axis of the rotating conveying space 210 through friction. Because the axis of the roller 220 is parallel to the central axis of the rotating conveying space 210, and its surface has been specially treated to increase friction, the pipe can rotate stably, providing the necessary rotational conditions for the outer wall polishing disc 300 and the inner wall polishing disc 400 to uniformly polish the inner and outer walls of the pipe. Because the axes of each travel drive wheel 230 are not in a straight line, the friction between the travel drive wheel 230 and the pipe provides the force for the pipe to move forward.

[0088] It should be noted that although there is a certain difference in diameter between the inner tube and the outer tube, the difference is small. At the same time, the rotating roller 220 and the traveling drive wheel 230 support the tube from both sides. Compared with three support points, two support points can simultaneously accommodate tubes with a certain range of diameters, so it can simultaneously accommodate the rotational conveying of the inner tube and the outer tube.

[0089] The axle of the driving wheel 230 is obliquely intersecting the central axis of the rotating conveying space 210. When the driving wheel 230 rotates under the drive of the motor, its force on the pipe can be decomposed into a force perpendicular to the pipe's axial direction and a force along the pipe's axial direction. The force perpendicular to the pipe's axial direction helps the pipe rotate, while the force along the pipe's axial direction propels the pipe forward along the rotating conveying space 210. The coordinated work of multiple sequentially arranged driving wheels 230 ensures the stability and continuity of the pipe during forward movement, realizing the function of rotating and forward conveying the pipe simultaneously, thus meeting the polishing device's requirement for continuous polishing of the pipe.

[0090] This embodiment also proposes a polishing method for processing bimetallic composite tubes, including the following steps: Step S1: The rotary conveyor assembly 200 sequentially conveys the inner tube and outer tube of the bimetallic composite pipe.

[0091] The outer tube of the bimetallic composite tube is placed within the rotary conveying space 210, with one side of the outer tube contacting the rotating roller 220 and the other side contacting the traveling drive wheel 230. The drive motor of the rotary conveying assembly 200 is started, causing the traveling drive wheel 230 to rotate, and the rotating roller 220 also begins to rotate. The traveling drive wheel 230 propels the outer tube forward through friction with it. Due to the tilt angle of its axle, the outer tube tends to rotate around the central axis of the rotary conveying space 210 during its movement. The rotating roller 220 stably drives the outer tube to rotate, achieving simultaneous rotation and forward conveying of the outer tube. The inner tube is then conveyed in the same manner.

[0092] Step S2: After the outer wall polishing disc 300 and the inner wall polishing disc 400 polish the outer wall and inner wall of the outer tube at the same time, the outer wall and inner wall of the inner tube are polished at the same time.

[0093] When the outer tube is conveyed to the working area of ​​the outer wall polishing disc 300 and the inner wall polishing disc 400, the outer wall polishing disc 300 rotates at high speed, and the polishing material on its surface contacts the outer wall of the outer tube to polish it. The inner wall polishing disc 400 also rotates at high speed under the drive of the drive motor 600. Due to the centrifugal force, the sliding block 430 slides outward in the guide groove 421 in conjunction with the elastic force of the second elastic element 450, so that the polishing part 440 contacts the inner wall of the outer tube and maintains appropriate pressure to polish it. During the polishing process, the rotary conveying assembly 200 continuously drives the outer tube to rotate and convey it forward, so that the outer wall polishing disc 300 and the inner wall polishing disc 400 can uniformly polish the inner and outer walls of the entire outer tube.

[0094] After the outer tube completes its inner and outer wall polishing and leaves the polishing area, the inner tube enters the polishing area. Similarly, the outer wall polishing disc 300 and the inner wall polishing disc 400 polish its inner and outer walls simultaneously. The diameters of the outer and inner tubes are relatively similar, both falling within the polishing range of the outer wall polishing disc 300 and the inner wall polishing disc 400. Both the outer wall polishing disc 300 and the inner wall polishing disc 400 have a specific applicable diameter range. For example, the sliding block 430 of the inner wall polishing disc 400 allows tubes with a certain diameter to be polished, rather than being limited to tubes with a fixed diameter.

[0095] Step S3: The inner tube with its outer and inner walls polished is fed into the outer tube with its outer and inner walls polished by the rotary conveying assembly 200.

[0096] After the inner tube has undergone polishing of both its inner and outer walls, it continues to be conveyed forward under the push of the rotary conveyor assembly 200. At this time, the outer tube, whose outer and inner walls have been polished, is waiting downstream. The operator observes the conveying positions of the inner and outer tubes. When the inner tube approaches the outer tube, the conveying speed of the rotary conveyor assembly 200 is adjusted appropriately to ensure that the inner tube can be accurately inserted into the outer tube. During the insertion process, the concentricity of the inner and outer tubes must be ensured to avoid deviation or jamming of the inner tube during insertion.

[0097] To ensure smooth insertion of the inner tube into the outer tube, a guiding device can be installed on the equipment. For example, a guide sleeve can be installed downstream of the rotary conveyor assembly 200. The inner diameter of the guide sleeve is slightly larger than the outer diameter of the inner tube, and the outer diameter is slightly smaller than the inner diameter of the outer tube. Under the guidance of the guide sleeve, the inner tube is accurately inserted into the outer tube. Simultaneously, some auxiliary methods can be used during the insertion process, such as applying an appropriate amount of lubricant to the end of the inner tube to reduce insertion resistance.

[0098] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A polishing apparatus for processing bimetallic composite tubes, used to polish the inner and outer tubes of a bimetallic composite tube, characterized in that, include: Rack (100); A rotary conveying assembly (200) is disposed on the frame (100) and has a rotary conveying space (210) for accommodating an outer tube and an inner tube. The rotary conveying space (210) has a central axis and is configured to rotary convey the outer tube and the inner tube. An outer wall polishing disc (300) is disposed on one side of the rotary conveying space (210) and configured to polish the outer walls of the outer tube and the inner tube. An inner wall polishing disc (400) is rotatably disposed in the rotary conveying space (210) and located on one side of the outer wall polishing disc (300). The roller shaft (410) of the inner wall polishing disc (400) is coaxially disposed with the central axis of the rotary conveying space (210). A support member (500) is disposed at the downstream end of the rotary conveying assembly (200) and has a perforation (510). The roller (410) of the inner wall polishing disc (400) passes through the perforation (510) and has an annular gap between itself and the inner wall of the perforation (510) for the passage of the inner tube and the outer tube. A rotary drive (600) is provided to drive the inner wall polishing disc (400) to rotate. The rotary drive (600) is located on the side of the support (500) away from the rotary conveying assembly (200). The rotary drive (600) is movable in a direction perpendicular to the axial direction of the perforation (510). It is configured to have at least a driven polishing state and a discharge clearance state. In the driven polishing state, the drive shaft of the rotary drive (600) is coaxial with the perforation (510). In the discharge clearance state, the rotary drive (600) is moved away from the perforation (510) to allow the inner and outer tubes in the perforation (510) to be conveyed downstream.

2. The polishing apparatus for processing bimetallic composite tubes according to claim 1, characterized in that, The inner wall of the perforation (510) has an annular limiting groove (511), and the roller (410) of the inner wall polishing disc (400) has an annular limiting flange (411). The annular limiting flange (411) can be accommodated in the annular limiting groove (511), and the diameter of the annular limiting flange (411) is smaller than the diameter of the perforation (510) so that the inner tube and the outer tube can pass through.

3. A polishing apparatus for processing bimetallic composite tubes according to claim 2, characterized in that, The annular limiting flange (411) has a tapered guide surface (412) on the side near the rotary conveying assembly (200), the tapered guide surface (412) being used to guide the inner tube and the outer tube through the annular gap.

4. A polishing apparatus for processing bimetallic composite tubes according to claim 3, characterized in that, The roller (410) of the inner wall polishing disc (400) has a prismatic connecting portion (413) at one end near the rotation drive (600), and also includes a quick-connect assembly (700), which includes: A quick-connect connector (710) is disposed on the drive shaft of the rotary drive member (600). When the rotary drive member (600) is in the drive polishing state, the quick-connect connector (710) is connected to the prismatic connecting part (413). When the rotary drive member (600) is in the discharge clearance state, the quick-connect connector (710) is disconnected from the prismatic connecting part (413).

5. A polishing apparatus for processing bimetallic composite tubes according to claim 4, characterized in that, The quick-connect connector (710) has a prismatic connecting groove (711), and one side of the prismatic connecting groove (711) has an inlet (712) for the entry of the prismatic connecting part (413). The quick-connect assembly (700) further includes: Sliding stops (720) are slidably provided on both sides of the inlet (712). The sliding stops (720) are used to block the prismatic connecting part (413) to prevent it from coming out of the prismatic connecting groove (711). The first elastic element (730) has one end acting on the sliding stop (720) and the other end acting on the quick connector (710) to provide the sliding stop (720) with force to block the prismatic connecting part (413).

6. A polishing apparatus for processing bimetallic composite tubes according to claim 5, characterized in that, The sliding stop (720) has a first guide slope (721) on both sides, and the prismatic connecting part (413) has a second guide slope (414) on both sides. The first guide slope (721) and the second guide slope (414) are used to guide the prismatic connecting part (413) to enter and exit the prismatic connecting groove (711).

7. A polishing apparatus for processing bimetallic composite tubes according to claim 1, characterized in that, The inner wall polishing disk (400) includes: Roller body (420) having a plurality of circumferentially arranged guide grooves (421); A sliding block (430) is slidably disposed in each of the guide grooves (421); Polishing component (440), the polishing component (440) is disposed at the end of the sliding swivel block (430) and is used for polishing the inner wall of the outer tube and the inner wall of the inner tube; The second elastic element (450) has one end acting on the sliding block (430) and the other end acting on the bottom of the guide groove (421) to provide a force for the sliding block (430) to move away from the bottom of the guide groove (421).

8. A polishing method for processing bimetallic composite tubes, utilizing the polishing apparatus for processing bimetallic composite tubes according to any one of claims 1 to 7, comprising the following steps: S1. The rotary conveying assembly (200) sequentially conveys the inner tube and outer tube of the bimetallic composite pipe; S2. After the outer wall polishing disc (300) and the inner wall polishing disc (400) polish the outer wall and inner wall of the outer tube at the same time, the outer wall and inner wall of the inner tube are polished at the same time. S3. The inner tube with its outer and inner walls polished is fed into the outer tube with its outer and inner walls polished by the rotary conveying assembly (200).

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