Titanium alloy pipe inner wall polishing and grinding device

Abstract

This invention discloses a polishing and grinding device for the inner wall of titanium alloy pipes. A permanent magnet outer stator is movably sleeved on the outside of the titanium alloy pipe. A base is provided with a guide rail. Part of the outer wall of the permanent magnet outer stator extends into and is movably installed within the guide rail, guiding the permanent magnet outer stator to move along the bending axis of the titanium alloy pipe. The remaining outer wall is exposed outside the base. A limiting part is provided between the permanent magnet outer stator and the guide rail to prevent relative rotation. The grinding part includes a flexible support shaft and a grinding head. The grinding head and its load-bearing wound inner rotor are rotatably connected to one end of the flexible support shaft. An electric slip ring is connected to one end of the flexible support shaft. The output end of the power supply equipment is electrically connected to the coil through the electric slip ring to provide dynamic commutation power to the winding, thereby driving the grinding head to rotate and grind the inner wall of the titanium alloy pipe. Compared with the prior art, this application can grind the grinding dead corners of the inner wall of the bent pipe, reducing the adverse effects of insufficient grinding of the inner wall of the pipe.

Description

Technical Field

[0001] This application relates to the field of pipe processing technology, specifically to a polishing and grinding device for the inner wall of titanium alloy pipes. Background Technology

[0002] The process of preparing titanium alloy pipes by rolling typically includes the following steps: rolling, extruding, stretching, and bending the metal material to form a pipe, and then grinding the pipe wall. The pipe obtained by rolling may be a straight pipe or a bend of a predetermined shape. However, existing pipe grinding devices, such as the grinding device disclosed in patent document CN217860352U, are usually of a straight-extending structure, which can only extend straight into the pipe for grinding, making it difficult to penetrate the bending area of ​​the bend to complete uniform grinding. However, if the inner wall of the pipe is not ground or is not ground sufficiently, it will lead to excessive surface roughness, reduced corrosion resistance, and may also adversely affect the fluid transport efficiency or safety. Summary of the Invention

[0003] The purpose of this application is to provide a polishing and grinding device for the inner wall of titanium alloy pipes, which can penetrate into the bending area of ​​the pipe and polish the inner surface of the pipe in that area, thereby reducing the adverse effects caused by insufficient polishing of the inner wall of the pipe.

[0004] In order to achieve the above-mentioned objectives of this application, the following technical solution is adopted: A polishing and grinding device for the inner wall of titanium alloy pipes, comprising: Electromagnetic actuator, base, and grinding section; The electromagnetic actuator includes a permanent magnet outer stator, a wound inner rotor, a power supply device, and an electric slip ring. The permanent magnet outer stator is movably sleeved outside the titanium alloy pipe. The base has a support structure for supporting the titanium alloy pipe. The base has a guide rail. Part of the outer wall of the permanent magnet outer stator extends into and is movably installed in the guide rail, while the remaining outer wall is exposed outside the base. The direction of movement of the permanent magnet outer stator in the guide rail is the same as its direction of movement when movably sleeved outside the titanium alloy pipe. A limiting part is provided between the permanent magnet outer stator and the guide rail to prevent relative rotation between the two. The grinding section includes a flexible support shaft and a grinding head. The wound inner rotor is mounted on the grinding head, and both are rotatably connected to the extended end of the flexible support shaft. The slip ring is connected to the extended end of the flexible support shaft. The output end of the power supply equipment is electrically connected to the coil of the wound inner rotor through the slip ring to provide dynamic commutation power to the winding, so that the winding generates an alternating magnetic field, which interacts with the static alternating magnetic field of the permanent magnet outer stator to generate a tangential force to drive the wound inner rotor to rotate. The grinding head then rotates to grind the inner wall of the titanium alloy pipe.

[0005] Preferably, the permanent magnet external stator has a handle on its outer wall outside the base.

[0006] Preferably, the grinding part further includes a head, the grinding head and the slip ring are both located between the two axial ends of the flexible support shaft and close to its extended end. The outer diameter of one axial end of the head matches the inner diameter of the titanium alloy pipe and is connected to the extended end of the flexible support shaft. The head is radially tapered away from the flexible support shaft along the axial direction of the head, and an movable gap is provided between the head and the inner wall of the titanium alloy pipe.

[0007] Preferably, the end of the head that is away from the flexible support axis is conical.

[0008] Preferably, the conical apex of the head smoothly transitions into a spherical surface.

[0009] Preferably, the end of the head near the flexible support shaft is cylindrical, and the cylindrical diameter of the head is the same as the diameter of the conical base, both matching the inner diameter of the titanium alloy pipe. The cylindrical end and the conical end of the head are coaxially connected.

[0010] Preferably, the guide track is a serpentine track with continuously alternating S-curves.

[0011] Compared with existing technologies, this application can adapt to the bending shape of the pipe through the flexible deformation of the flexible support shaft. At the same time, the flexible support shaft has a certain degree of rigidity, and the grinding head can be pushed and pulled forward and backward using the support connection of the flexible support shaft. That is, by pushing and pulling the bearing support shaft outside the pipe, the grinding head connected to it can be transported to any position inside the pipe for polishing. In other words, this application can penetrate deep into the bending area of ​​the pipe and polish the inner surface of the pipe in that area, reducing the adverse effects of insufficient polishing of the inner wall of the pipe. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying 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.

[0013] Figure 1 This is a cross-sectional view along the axial direction of the titanium alloy tube inner wall polishing and grinding device of Example 1. Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3 This is a schematic diagram of the base structure of Example 1; Figure 4This is a radial cross-sectional view of the guide rail in Example 1; Figure 5 A diagram illustrating the process of lifting the titanium alloy pipe and removing the support block; Figure 6 This is a cross-sectional view along the axial direction of the titanium alloy tube inner wall polishing and grinding device of Example 2; Figure 7 for Figure 6 A magnified view of a portion of the image; Figure 8 This is a schematic diagram of the base structure in Example 2; Figure 9 for Figure 2 A partial structural schematic diagram of the polishing and grinding device for the inner wall of the titanium alloy tube at the central support block in the embodiment, viewed radially at that location.

[0014] Titanium alloy pipe 100, permanent magnet external stator 210, first notch 211, handle 212, wound internal rotor 220, power supply equipment 230, electric slip ring 240, base 300, guide rail 310, rib 311, support block 320, second notch 321, flexible support shaft 410, grinding head 420, bearing 421, head 430, spherical surface 431. Detailed Implementation

[0015] The embodiments of the technical solution of the present invention will be described in detail below with reference to the examples. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and are therefore only examples, and should not be used to limit the scope of protection of the present invention. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0016] Figure 1 This is a cross-sectional view along the axial direction of the titanium alloy tube inner wall polishing and grinding device of Example 1. Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3 This is a schematic diagram of the base structure in Example 1; Figure 4 This is a radial cross-sectional view of the guide rail in Example 1; Figure 5 A diagram illustrating the process of lifting the titanium alloy pipe and removing the support block; Figure 6 This is a cross-sectional view along the axial direction of the titanium alloy pipe inner wall polishing and grinding device of Example 2. The support block outside the guide rail on the base is for use with Figure 5 The method shown is used to remove the support block in front of the permanent magnet outer stator in the direction of travel. After grinding this area, the pipe can be lifted again, the rear support block can be installed, and the other support block in front can be removed. Figure 7 for Figure 6 A magnified view of a portion of the image; Figure 8 This is a schematic diagram of the base structure in Example 2; Figure 9 The permanent magnet external stator of Example 2 just moved to Figure 8 A partial enlarged view of the radial section of the titanium alloy pipe inner wall polishing and grinding device at the third support block from the left. This application provides a polishing and grinding device for the inner wall of titanium alloy pipes, including an electromagnetic actuator, a base 300, and a grinding section. Wherein: The electromagnetic actuator includes a permanent magnet outer stator 210, a wound inner rotor 220, a power supply device 230, and an electric slip ring 240. The permanent magnet outer stator 210 is movably sleeved outside the titanium alloy pipe 100. The base 300 has a support structure for supporting the titanium alloy pipe 100. The base 300 has a guide rail 310. Part of the outer wall of the permanent magnet outer stator 210 extends into and is movably installed inside the guide rail 310, while the remaining outer wall is exposed outside the base 300. The direction of movement of the permanent magnet outer stator 210 in the guide rail 310 is the same as its direction of movement when movably sleeved outside the titanium alloy pipe 100. A limiting part is provided between the permanent magnet outer stator 210 and the guide rail 310 to prevent the permanent magnet outer stator 210 from rotating relative to the guide rail 310. The grinding section includes a flexible support shaft 410 and a grinding head 420. An electric slip ring 240 is connected to one end of the flexible support shaft 410. A wound inner rotor 220 is mounted on the grinding head 420. The grinding head 420 is rotatably connected to one end of the flexible support shaft 410 (preferably using a bearing 421 for rotatable connection, e.g.) Figure 2 , Figure 7 As shown, the inner ring of bearing 421 is fixedly sleeved on the flexible support shaft 410, and the outer ring of bearing 421 is fixedly sleeved on the grinding head 420 and the inner wall of the wound inner rotor 220 mounted on the grinding head 420, and the rotation axis coincides with the axis of the wound inner rotor 220. The output terminal of the power supply device 230 is electrically connected to the coil of the wound inner rotor 220 via an electric slip ring 240. Under the control of its own controller, it outputs electrical energy to dynamically commutate the windings, causing the windings to generate an alternating magnetic field. This magnetic field interacts with the static magnetic field of the permanent magnet outer stator 210, continuously generating a repulsive force between the magnetic poles of the permanent magnet outer stator 210 and the magnetic poles of the wound inner rotor 220. As is well known, when an electromagnetic actuator drives the rotor to rotate, its commutation power supply needs to form a phase difference through an angular misalignment design to prevent the rotor from jamming and stopping after rotating a certain angle, ensuring continuous rotor rotation. The principle is to use the time difference of commutation to create a spatial angular difference, so that the repulsive force is not strictly distributed radially, but has a slight circumferential tilt, so that the repulsive force has a component in the rotor tangential direction, thereby applying a tangential force to the rotor to drive it to rotate continuously.

[0017] The static magnetic field of the permanent magnet outer stator 210 can also be called the static alternating magnetic field. "Static" means that the permanent magnet has an inherent magnetic field even without energization, unlike the magnetic field generated by windings which changes with time and functional current. When an external force physically displaces the permanent magnet outer stator 210, only the position of the magnetic field changes; the inherent characteristics of the magnetic field itself remain constant. "Alternating" refers to the alternation in spatial distribution, not the temporal alternation caused by commutation power supply. Specifically, on the inward side of the permanent magnet outer stator 210, the magnetic poles are arranged in an alternating N-S pattern circumferentially.

[0018] This application enables the flexible support shaft 410 to adapt to the bending shape of the pipe through flexible deformation. Simultaneously, the flexible support shaft 410 possesses a certain degree of rigidity, allowing the grinding head 420 to be pushed and pulled forward using its support connection. In other words, by pushing or pulling the bearing 421 support shaft outside the pipe, the connected grinding head 420 can be transported to any position inside the pipe for polishing. Compared to existing technologies, this application can penetrate deep into the bending area of ​​the pipe to polish the inner surface of that area, reducing the adverse effects of insufficient polishing of the pipe's inner wall.

[0019] This application does not specify the specific material of the flexible support shaft 410, nor does it impose specific limitations on the structure that enables flexible deformation while ensuring sufficient support rigidity. It also does not specify the push-pull operation method for operating the flexible support shaft 410 outside the tube. Any metallic or non-metallic material that meets the requirements (good deformation capacity and sufficient rigidity) can be used, such as shape memory metal materials commonly used in medical interventional guidewire shafts, or nickel-titanium alloys (e.g., nickel-titanium alloys with excellent elasticity, tensile strength, and fatigue resistance). This allows the elastic support shaft to conform to the complex shape of the bend using its elastic deformation capacity, pre-shaped alloy shape memory capacity, and axial support capacity, enabling it to penetrate deep into the bend area for inner wall polishing. The operation method varies from person to person and can include pushing, pulling, shaking, or transferring techniques, with the principle of moving the grinding head 420 to the preset position. Customized transparent bends of common shapes can also be used as training and observation tools for operation techniques.

[0020] This application does not specifically limit the shape of the pipe being ground; it can be a straight pipe, a bent pipe, a single bent pipe (such as a 90° bend, a 60° bend, or a U-shaped pipe), or a multi-bend pipe (such as an S-bend, a double U-bend), or a special Y-shaped pipe, a serpentine pipe, a spiral pipe, or a coiled pipe. The guide rail 310 of the base 300 is customized according to the specific pipe being ground. The specific structure of the support structure in this application is specifically limited in how to support the titanium alloy pipe 100 to prevent easy displacement due to moisture, while also leaving a suspension space between the pipe and the rail wall for the permanent magnet outer stator 210 to pass through. A detachable clamp can be set at the axial end of the pipe to clamp and fix both ends after the outer stator is fitted; a support block 320 can also be detachably installed inside the pipe. The support block 320 has an arc-shaped cross-section along the radial direction of the pipe, and a second notch 321 matching the rib 311 is provided on the outer wall in the middle of the arc. The central angle of the arc of the support block 320 is less than 180 degrees. When the outer stator reaches this point, gently lift the pipe and remove the support block 320 below from the guide rail 310.

[0021] In one possible implementation, the bent pipe to be tested is radially enlarged to provide space for the permanent magnet external stator 210, and a slightly larger empty pipe is prepared. A diameter is made at the cross-section of the pipe end (Example 2, see Example 2). Figure 9 ) or string (Example 1, see Figure 4The trajectory of all points on the diameter / chord along the pipe axis forms a cross-section, which is divided into two parts. One of these parts is taken (if the diameter is mentioned above, any one part can be taken here; if the chord is mentioned above, the smaller one is taken here). A rib 311 extending along the original pipe axis is set on the original inner surface to form the rail wall of the guide rail 310. The base 300 is equipped with a detachable clamping fixture at the axial end of the guide rail for clamping the axial end of the pipe being ground, and / or the aforementioned support block 320 is set in the guide rail 310. In this application, a first notch 211 matching the rib 311 is provided on the outer wall of the permanent magnet outer stator 210. The protrusion direction of the rib 311, the opening direction of the first notch 211, and the opening direction of the second notch 321 are consistent and perpendicular to the local axial direction of the guide rail 310 where it is located. Because the central angles of the arcs of the support block 320 and the guide rail 310 in the radial section along the guide rail 310 are both less than 180 degrees, and the rib 311 engages radially with the first and second notches (211, 321), the support block 320 (relative to the guide rail 310) can be loaded and unloaded by gently lifting the pipe. The outer end of the permanent magnet outer stator 210 with the first notch 211 extends into the guide rail 310 and contacts the rail wall. The first notch 211 engages with the rib 311, guiding the axial movement of the permanent magnet outer stator 210 and limiting its rotation. At this time, the inner wall of the permanent magnet outer stator 210 contacts the outer wall of the pipe being processed, leaving sufficient clearance between them; part of the outer wall contacts the rail wall, also leaving sufficient clearance between them; the remaining outer wall is outside the rail, exposed to the air outside the base 300 for manual operation.

[0022] The guide rail 310 on the base 300 remains stationary relative to the installation environment, and guides the movable permanent magnet external stator 210. A person holds the permanent magnet external stator 210, exposing the side wall outside the guide rail 310 of the base 300, and pushes and pulls it to move it to any position, maintaining a relative relationship with the wound inner rotor 220 drilled into the tube. This achieves interaction between the internal and external magnetic fields, thereby enabling the rotation of the wound inner rotor 220.

[0023] This application does not specifically limit how to ensure the relative position of the outer stator and inner rotor; various methods exist, which will not be elaborated here. A movable scale for the permanent magnet outer stator 210 can be set on the exposed surface of the base 300 and the rail wall. Another flexible support shaft 410 is mounted on the permanent magnet outer stator 210. As the permanent magnet outer stator 210 moves, it deforms under the constraint of the guide rail wall. A movable scale is set on the flexible support shaft 410 of the permanent magnet outer stator 210 to quantify the axial movement of the permanent magnet outer stator 210 and display its position. Similarly, in the grinding section, a movable scale can be set on the flexible support shaft 410 connecting the supporting grinding head 420 to quantify the axial movement of the wound inner rotor 220 and display its position. The positions are adjusted based on these two methods to achieve alignment and realize electromagnetic interaction between the inner and outer rotors, thereby driving the wound inner rotor 220 to rotate. The hand-held push-pull mechanism of the permanent magnet external stator 210 and the manual operation of the outer end of the flexible support shaft 410 can be operated by one person with two hands or by two people working together, depending on their proficiency and the effectiveness of their cooperation. This application does not make any specific limitations, as long as the two can drive the inner rotor to rotate accordingly.

[0024] This application incorporates a wound inner rotor 220 with an electromagnetic actuator in the grinding head 420. The wound inner rotor 220 is rotatably connected to a flexible support shaft 410, and an electric slip ring 240 powers the rotating component. This application does not specify the dimensions or mechanical structure of the electric slip ring 240, as long as it can extend into the tube, allow for sufficient clearance, ensure insulation safety, and provide timely heat dissipation. All live components within the device, including the wound inner rotor 220, the electric slip ring 240, and the power cables, are insulated. If necessary, components that directly or indirectly contact the live components, such as the outer surface of the flexible support shaft 410 and the inner surface of the permanent magnet outer stator 210, are also insulated. Leakage monitoring devices are installed at the tube, the outer end of the flexible support shaft 410, and the permanent magnet outer stator 210. The signal output terminal is electrically connected to the power supply equipment 230. Upon detecting leakage, the power is immediately cut off to ensure personnel safety. In addition to the grinding head 420's outer edge needing to contact the tube wall, the largest possible clearance should be maintained between all components inside the tube (especially the energized coil of the insulated wound inner rotor 220) and the tube wall to ensure electrical safety. Furthermore, the arrangement of the magnetic poles of the permanent magnet outer stator 210 and the wound inner rotor 220, how to ensure insulation for safety, and how the winding coil power supply device 230 should perform commutation power supply to generate an alternating magnetic field to drive the wound inner rotor 220 to rotate continuously are inherent structural features of electromagnetic induction actuators and will not be elaborated upon here.

[0025] In one possible implementation, the outer wall of the permanent magnet outer stator 210 outside the base 300 is provided with a handle 212. Based on the insulation design of both the live components and the permanent magnet outer stator 210, the handle 212 structure can be made of insulating material to further ensure personnel safety.

[0026] In one possible implementation, the grinding section further includes a head 430, a grinding head 420 and an electric slip ring 240, both located between the two axial ends of the flexible support shaft 410 and close to its extended end. The outer diameter of the axial end of the head 430 matches the inner diameter of the titanium alloy pipe 100 and is connected to the extended end of the flexible support shaft 410. The head 430 is radially tapered away from the flexible support shaft 410 along its axial direction, and an movable gap is provided between the head 430 and the inner wall of the titanium alloy pipe 100.

[0027] Optionally, the end of the head 430 facing away from the flexible support shaft 410 is conical. Preferably, the apex of the conical head 430 smoothly transitions to a spherical surface 431 to prevent accidental scratches to the inner wall of the pipe. Further optionally, the end of the head 430 near the flexible support shaft 410 is cylindrical, with the cylindrical diameter of the head 430 matching the diameter of the conical base, both matching the inner diameter of the titanium alloy pipe 100, and the cylindrical and conical ends of the head 430 being coaxially connected.

[0028] To better illustrate the polishing and grinding device for the inner wall of titanium alloy pipes, this application provides the following two embodiments: Example 1, such as Figures 1 to 5 As shown, the aforementioned titanium alloy pipe 100 / pipe material is a 90° bend. The guide rail 310 is a 90° bend rail.

[0029] Example 2, as Figures 6 to 9 As shown, the aforementioned titanium alloy pipe 100 / pipe material is a serpentine pipe. The guide rail 310 is a serpentine rail with continuous alternating S-bends.

[0030] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

[0031] The present application has been described in a relatively specific and detailed manner above through general descriptions and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A device for polishing the inner wall of a titanium alloy pipe, characterized by, include: Electromagnetic actuator, base, and grinding section; The electromagnetic actuator includes a permanent magnet outer stator, a wound inner rotor, a power supply device, and an electric slip ring. The permanent magnet outer stator is movably sleeved on the outside of the titanium alloy pipe. The base is provided with a support structure for supporting the titanium alloy pipe. The base is provided with a guide rail. Part of the outer wall of the permanent magnet outer stator extends into and is movably installed in the guide rail, while the remaining outer wall is exposed outside the base. The direction of movement of the permanent magnet outer stator in the guide rail is the same as its direction of movement when movably sleeved on the outside of the titanium alloy pipe. A limiting part is provided between the permanent magnet outer stator and the guide rail to prevent relative rotation between the two. The grinding section includes a flexible support shaft and a grinding head. The wound inner rotor is mounted on the grinding head, and both are rotatably connected to the extended end of the flexible support shaft. The slip ring is connected to the extended end of the flexible support shaft. The output end of the power supply equipment is electrically connected to the coil of the wound inner rotor through the slip ring to provide dynamic commutation power to the winding, so that the winding generates an alternating magnetic field, which interacts with the static alternating magnetic field of the permanent magnet outer stator to generate a tangential force to drive the wound inner rotor to rotate. The grinding head then rotates to grind the inner wall of the titanium alloy pipe.

2. The apparatus of claim 1, wherein: The permanent magnet external stator is located on the outer wall of the base and has a handle.

3. The apparatus of claim 1, wherein: The grinding section also includes a head, the grinding head and the electric slip ring are both located between the two axial ends of the flexible support shaft and close to its extended end. The outer diameter of the axial end of the head matches the inner diameter of the titanium alloy pipe and is connected to the extended end of the flexible support shaft. The head is radially tapered away from the flexible support shaft along the axial direction of the head, and an movable gap is provided between the head and the inner wall of the titanium alloy pipe.

4. The apparatus of claim 3, wherein: The end of the head that is away from the flexible support axis is conical.

5. The apparatus of claim 4, wherein: The cone-shaped apex of the head smoothly transitions into a sphere.

6. The apparatus of claim 4, wherein: The head is cylindrical at one end near the flexible support shaft. The cylindrical diameter of the head is the same as the diameter of the conical base, both of which match the inner diameter of the titanium alloy pipe. The cylindrical end and the conical end of the head are coaxially connected.

7. The apparatus of claim 1, wherein: The guide track is a serpentine track with continuous alternating S-curves.

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