A method and apparatus for magnetically assisted rotating fluid polishing of the inner surface of a pipe

Abstract

The present invention provides a method and device for polishing the inner surface of a pipeline with magnetic force assistance and a rotating fluid, and belongs to the field of mechanical technology. The polishing device includes a working platform, a fluid processing unit, a vibration unit, a magnetic control unit and a spiral guide unit. The fluid processing unit is symmetrically installed on both sides of the working platform, and the two ends of the workpiece are connected to the fluid processing unit; the spiral guide unit is a spiral rod with magnetic conductivity, which is located inside the workpiece, and the spiral structure on the surface of the spiral rod guides the polishing liquid from the original axial linear motion to the spiral feeding motion along the pipe wall, thereby improving the polishing efficiency. The present invention uses a magnetic force-assisted rotating fluid polishing device on the inner surface of the pipeline for polishing, which can achieve rapid and uniform polishing of the inner surface of a straight pipe and a pipe with variable roughness, thereby reducing the along-the-way resistance of the medium in the pipe, improving the sampling accuracy, and enhancing the stability of the fluid in the pipe, solving the problems of limited polishing of the inner surface of existing slender pipes, uneven processing, and low processing efficiency.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to a method and a device for polishing the inner surface of a pipeline by magnetic force-assisted rotating fluid. Background Art

[0002] With the continuous miniaturization of modern high-end precision equipment, slender tube parts are widely used in aerospace, biomedicine, chemical and chemical industries due to their small diameter and large aspect ratio, playing the role of sample extraction, fluid transportation, thermal conductivity and heat dissipation. In order to ensure the stability, accuracy and residue-free of sample extraction and fluid transportation, the inner surface of these slender tubes needs to achieve a high degree of smoothness. At present, slender tube parts are mainly prepared by drawing and extrusion molding processes. However, when manufacturing small-diameter tubes, wrinkles are easily generated on the inner surface, resulting in its roughness failing to meet industrial requirements, so further polishing is required.

[0003] At present, the main methods for polishing the inner surface of slender tubes are mechanical polishing, abrasive flow polishing, magnetic grinding and electrolytic polishing. Among them, mechanical polishing uses a tool head to probe into the inner surface of the slender tube, but for small-diameter slender tubes, it is difficult for the tool to penetrate; abrasive flow polishing uses high-pressure and high-viscosity non-Newtonian fluid for polishing, but the pressure in the slender tube decays seriously along the way, resulting in serious uneven polishing; magnetic grinding uses magnets to drive the magnetic particles in the tube to polish, but the magnetic particles cannot effectively and evenly cover the inner surface due to the difficulty of flowing; electrolytic polishing is to use the redox reaction to dissolve the workpiece as the anode in the electrolyte, but it is difficult for the cathode to penetrate into the interior of the slender tube, and it is difficult to avoid short circuits.

[0004] The existing patents related to the polishing of the inner surface of slender tubes are as follows:

[0005] Chinese patent CN202137643U proposes a magnetic polishing machine for the inner surface of a slender tube, which can quickly remove burrs, polish and clean the inner surfaces of various metal tubes and non-metallic tubes such as hard plastics. In this device, an iron core wrapped with a coil is arranged below and on the side of the non-magnetic slender tube. Alternating current is passed through the iron core to generate a reciprocating alternating magnetic field. Magnetic abrasive particles are placed in the tube cavity, and the magnetic abrasive particles are driven by the magnetic field generated by the iron core. At the same time, the motor drives the slender tube to rotate, thereby polishing its inner surface. This device can complete the polishing of the inner surface that cannot be performed or the processing quality cannot be guaranteed by traditional technology, but the coil generates severe heat after being energized, and there is a lack of corresponding heat dissipation measures; at the same time, the transmission wheel can only drive large-diameter tubes, and this device is not suitable for processing small-diameter slender tubes.

[0006] Chinese patent CN201455796U proposes a steel pipe inner surface polishing device, which can effectively polish the entire steel pipe inner surface. The device polishes the inner surface of the steel pipe by a polishing rope. The polishing rope passes through the steel pipe to be polished and is sleeved on the driving wheel and the driven wheel, and the driving wheel is driven by a motor. A magnetic core is provided in the polishing rope, and a magnetic strip that can generate mutual attraction with the magnetic core is provided below the steel pipe to be polished. At the same time, the steel pipe rotates under the drive of the motor, thereby achieving the polishing process of the inner surface of the steel pipe. The device has a simple structure and obvious effect, but it uses a polishing rope for polishing, which has high requirements for the polishing rope and limited polishing effect. It cannot meet the polishing requirements for slender tubes with high requirements for the inner surface quality. At the same time, this method has high requirements for the aperture of the slender tube and is not suitable for polishing slender tubes with smaller apertures. Moreover, this method is difficult to use for slender tubes with poor rigidity, and it is impossible to keep the polishing rope close to the inner surface of the slender tube.

[0007] Patent CN206998477U proposes a polishing machine for the inner hole of a slender pipe. The device uses yarn to perform axial polishing on the inner hole of a workpiece. The yarn is clamped and fixed in sequence by a guide wheel, the inner hole of the workpiece, and a roller. The abrasive is driven by the yarn to move axially and radially relative to the inner hole of the workpiece, thereby polishing the inner hole. Although the yarn can enter a small inner hole, the abrasive driven by the yarn is very small and the inner hole surface cannot be effectively polished.

[0008] Patent CN109079590B proposes a polishing method based on magnetic field-assisted non-Newtonian fluid thickening, which uses an external magnetic field to increase the viscosity of the non-Newtonian fluid and an external polishing liquid circulation device. However, this method is mainly aimed at external surface polishing, and it is difficult for high-viscosity fluid to enter a complex internal flow channel with a relatively large length-to-diameter ratio and curved pipes. Summary of the invention

[0009] In view of the problems existing in the current polishing schemes, the present invention proposes a fluid polishing device and method for the inner surface of a slender tube with magnetically controlled flow field scouring intensity, which can achieve rapid and uniform polishing of the inner surfaces of straight tubes and tubes with variable roughness, thereby reducing the along-the-line resistance of the medium in the tube, improving sampling accuracy, and enhancing the stability of the fluid in the tube, thereby solving the problems of limited polishing of the inner surface of existing slender tubes, uneven processing, and low processing efficiency.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A magnetic force assisted rotating fluid polishing device for the inner surface of a pipeline, the polishing device comprises a working platform 8, a fluid processing unit, a vibration unit, a magnetic force control unit and a spiral guide unit. There are two fluid processing units, which are symmetrically installed on the left and right sides of the working platform 8; the left and right ends of the slender tube, i.e., the workpiece 6, are respectively connected to the fluid processing units on the left and right sides of the working platform 8.

[0012] The spiral guide unit is a spiral rod 7, which is made of a magnetically conductive material and is located inside the workpiece 6. The spiral structure on the surface of the spiral rod 7 guides the polishing liquid from the original axial linear motion to the spiral feeding motion along the tube wall, thereby increasing the fluid motion stroke and increasing the proportion of effective polishing fluid in contact with the wall, thereby improving the polishing efficiency.

[0013] The magnetic control unit is located outside the workpiece 6, and the entire magnetic control unit is located above the vibration platform 13, wherein the vibration platform 13 is located on the working platform 8. The magnetic control unit includes a magnetic pole fixture 10, an electromagnet 11, and a magnetic pole 12. Two magnetic pole fixtures 10 are respectively arranged at both ends of the workpiece 6. Four magnetic poles 12 are placed in each magnetic pole fixture 10. The four magnetic poles are symmetrical about the axis origin of the workpiece and are evenly distributed around the workpiece; an electromagnet 11 is placed directly below the workpiece 6, and the electromagnet 11 is located between the two magnetic pole fixtures 10. A high-intensity magnetic field is generated by the electromagnet 11. Since the four magnetic poles 12 are symmetrical about the axis origin of the workpiece, a magnetic field is generated in the area adjacent to the workpiece 6. The magnetic poles and the spiral guide unit are magnetically repelled from each other, and the magnetic field force and gravity on the spiral rod 7 offset each other, so that the spiral guide unit can be suspended; the electromagnet 11 will generate an electromagnetic field after being energized, and the electromagnetic field will generate a magnetic field force on the spiral rod 7, controlling the spiral rod 7 to move up and down along the direction of the magnetic field, thereby controlling the radial movement of the spiral guide unit, adjusting the polishing area, and achieving uniform polishing of the inner surface of the slender tube.

[0014] There are two groups of fluid processing units, which are symmetrically arranged on both sides of the workpiece 6. Each group of fluid processing units includes a piston 4, a piston cylinder 2, a piston rod 1, a vibration connector 5 and a piston cylinder bracket 3. The piston cylinder 2 is fixedly connected to the work platform 8 through the piston cylinder bracket 3, and the piston 4 is installed in the piston cylinder 2. The piston 1 is slidably connected to the inner surface of the piston cylinder 2, and the cavity between the inner side of the piston 1 and the inner surface of the piston cylinder 2 is filled with polishing liquid; the inner end of the piston rod 1 is fixedly connected to the piston 4, and the piston rod 1 is slidably connected to the opening at the outer end of the piston cylinder 2; the outlet at the inner end of the piston cylinder 2 is connected to one end of the vibration connector 5, and the other end of the vibration connector 5 is clamped to one end of the workpiece 6 through an internal buckle, and the vibration connector 5 is in communication with the workpiece 6. The vibration connector 5 is installed on the fixture 9, and the two fixtures 9 are also arranged on the vibration platform 13, located outside the magnetic pole fixture 10.

[0015] The vibration unit is a vibration platform 13, which is located at the lower side of the workpiece 6. The vibration platform 13 drives the fixture 9 to vibrate at a high frequency, thereby driving the workpiece 6 to vibrate back and forth, thereby increasing the contact frequency and impact force with the abrasive particles and improving the polishing efficiency.

[0016] Furthermore, the polishing medium in the polishing liquid is selected according to the material of the workpiece 6: cerium oxide is selected when the material of the workpiece 6 is quartz glass, aluminum oxide is selected when the material of the workpiece 6 is stainless steel, and diamond powder is selected when the material of the workpiece 6 is cast iron.

[0017] A method for polishing the inner surface of a pipeline by magnetic force-assisted rotating fluid, using a magnetic force-assisted rotating fluid polishing device for polishing the inner surface of the pipeline, comprising the following steps:

[0018] Step 1: Select a suitable polishing medium according to the material of the workpiece 6 to prepare a polishing liquid, stir the prepared polishing liquid evenly and then suck it into the inner cavity of the piston cylinder 2.

[0019] Step 2: Connect the outlet of the piston cylinder 2 to the vibration connector 5 through a threaded connection, and connect the vibration connector 5 to the two ends of the workpiece 6 through the internal buckle. After the overall connection, check the overall sealing of the device.

[0020] Step 3: Push the piston rods 1 at both ends of the left and right to move synchronously through the external push rod, so that the polishing liquid is pushed out by the piston cylinder 2 on one side while the polishing liquid is sucked into the piston cylinder 2 on the other side. The polishing liquid flushes back and forth on the inner surface of the workpiece 6 under the pushing action of the piston rod 1, thereby polishing the inner surface of the workpiece 6. While the polishing liquid is flowing: start the vibration platform 13 to drive the workpiece 6 to vibrate, so that the polishing liquid inside the workpiece 6 vibrates, increases the contact frequency and impact force of the workpiece 6 and the abrasive particles in the polishing liquid, and improves the processing efficiency. By adjusting the distance between the magnetic pole 12 and the spiral rod, the magnetic force and gravity on the spiral rod 7 offset each other and float in the air. By adjusting the power-on voltage of the electromagnet 11 to control the position of the spiral rod 7, the spiral rod 7 adjusts its position under the action of the electromagnetic field and is stably located in the center of the workpiece 6, so that the polishing liquid flows in a spiral, increases the fluid movement stroke, increases the proportion of effective polishing fluid in contact with the wall, and improves the polishing efficiency.

[0021] Step 4: After the processing is completed, remove the magnetic pole 12 of the magnetic control unit, turn off the vibration platform 13, remove the workpiece 6, and put it into the ultrasonic cleaning machine for cleaning.

[0022] Step 5: inspect the processed workpiece 6. If the inner surface quality reaches the expected target, the polishing process is completed. If it does not meet the requirements, repeat the above process.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention adopts a high-pressure water-based low-viscosity fluid. Compared with a high-viscosity mud abrasive, due to the low viscosity of the liquid, the local pressure loss generated when the fluid is changed in direction by the spiral rod is small. The high-pressure fluid entrains the polishing abrasive particles to scratch and plow the inner wall material of the slender tube, thereby completing the rapid polishing of the inner surface of the tube.

[0025] (2) The present invention changes the flow path shape of the polishing liquid inside the workpiece through the spiral blade structure of the spiral rod, and the spiral structure enables the polishing liquid to perform a spiral feeding motion along the tube wall. Compared with the fluid unidirectional flushing polishing without a spiral rod, the movement trajectory of the rotating fluid in contact with the inner wall is long, and the amount of material removed from the inner wall of the workpiece is greatly increased; the fluid that effectively participates in the polishing is changed from a small amount of thin layer close to the wall to multiple streams of rotating fluid moving along the wall in full contact with the workpiece, and the effective utilization rate of the fluid is greatly improved; at the same time, the rotating fluid increases the inclination angle of the abrasive particles hitting the wall, ensuring the speed of the abrasive particles hitting the wall while increasing the pressure of the abrasive particles hitting the wall, further achieving an improvement in the removal rate.

[0026] (3) The present invention achieves the mutual cancellation of the magnetic force and gravity on the magnetic screw rod by designing a magnetic field and using an electromagnet as an aid, so that the screw rod is suspended at the center of the workpiece; at the same time, since the magnetic field strength of the mutually repelling magnetic poles has a minimum value at the center point, that is, the lowest potential energy point, it is ensured that when the magnetic pole moves, it can drive the magnetic screw rod to move so that it is always at a low potential energy point.

[0027] (4) The present invention uses a vibration device to assist in polishing, so that the workpiece generates high-frequency vibration in a small range, increases the contact frequency and impact force between the workpiece and the abrasive particles, increases the amount of material removed by the abrasive particles, and thus improves the polishing efficiency. At the same time, high-frequency vibration can promote the movement of tiny abrasive particles, prevent abrasive particle sedimentation, improve abrasive particle uniformity, and thus improve the roughness of the inner wall of the workpiece after polishing.

[0028] (5) The present invention adopts bidirectional fluid polishing, and the polishing liquid is repeatedly used in the abrasive cylinder, which can save costs and bring huge environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a side view of the device of the present invention.

[0030] Figure 2 It is a front cross-sectional view of the device of the present invention (section lines are not shown).

[0031] Figure 3 It is an enlarged view of the interior of the workpiece of the present invention.

[0032] In the figure: 1 piston rod; 2 piston cylinder; 3 piston cylinder bracket; 4 piston; 5 vibration connecting piece; 6 workpiece; 7 screw rod; 8 working platform; 9 fixture; 10 magnetic pole fixture; 11 electromagnet; 12 magnetic pole; 13 vibration platform. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0034] like Figure 1 As shown, a magnetic force assisted rotating fluid polishing device for the inner surface of a pipeline comprises a working platform 8, a fluid processing unit, a vibration unit, a magnetic force control unit and a spiral guide unit. There are two fluid processing units, which are symmetrically installed on the left and right sides of the working platform 8; the left and right ends of the slender tube, i.e., the workpiece 6, are respectively connected to the fluid processing units on the left and right sides of the working platform 8.

[0035] The spiral guide unit is a spiral rod 7, the material of which must be magnetically conductive and located inside the workpiece 6. The spiral structure on the surface of the spiral rod 7 guides the polishing liquid from the original axial linear motion to the spiral feeding motion along the tube wall, thereby increasing the fluid motion stroke and increasing the proportion of effective polishing fluid in contact with the wall, thereby improving the polishing efficiency.

[0036] The magnetic control unit is located outside the workpiece 6, and the entire magnetic control unit is located above the vibration platform 13, wherein the vibration platform 13 is located on the working platform 8. The magnetic control unit includes a magnetic pole fixture 10, an electromagnet 11, and a magnetic pole 12. Two magnetic pole fixtures 10 are respectively arranged at both ends of the workpiece 6, and four magnetic poles 12 are placed in each magnetic pole fixture 10. The four magnetic poles are symmetrical about the axis origin of the workpiece and are evenly distributed around the workpiece; an electromagnet 11 is placed directly below the workpiece 6, and the electromagnet 11 is located between the two magnetic pole fixtures 10. A high-intensity magnetic field is generated by the electromagnet 11. Since the four magnetic poles 12 are symmetrical about the axis origin of the workpiece, a magnetic field is generated in the area adjacent to the workpiece 6. The magnetic poles and the spiral rod 7 are magnetically repelled, and the magnetic field force and gravity acting on the spiral rod 7 cancel each other out, so that the spiral guide unit can be suspended. The electromagnet 11 will generate an electromagnetic field after being energized, and the electromagnetic field will generate a magnetic field force on the spiral rod 7, controlling the spiral rod 7 to move up and down along the direction of the magnetic field, thereby controlling the radial movement of the spiral guide unit, adjusting the polishing area, and achieving uniform polishing of the inner surface of the slender tube.

[0037] There are two groups of fluid processing units, which are symmetrically arranged on both sides of the workpiece 6. Each group of fluid processing units includes a piston 4, a piston cylinder 2, a piston rod 1, a vibration connector 5 and a piston cylinder bracket 3. The piston cylinder 2 is fixedly connected to the work platform 8 through the piston cylinder bracket 3, and the piston 4 is installed in the piston cylinder 2. The piston 1 is slidably connected to the inner surface of the piston cylinder 2, and the cavity between the inner side of the piston 1 and the inner surface of the piston cylinder 2 is filled with polishing liquid; the inner end of the piston rod 1 is fixedly connected to the piston 4, and the piston rod 1 is slidably connected to the opening at the outer end of the piston cylinder 2; the outlet at the inner end of the piston cylinder 2 is connected to one end of the vibration connector 5, and the other end of the vibration connector 5 is clamped to one end of the workpiece 6 through an internal buckle, and the vibration connector 5 is in communication with the workpiece 6. The vibration connector 5 is installed on the fixture 9, and the two fixtures 9 are also arranged on the vibration platform 13, located outside the magnetic pole fixture 10.

[0038] The vibration unit is a vibration platform 13, which is located at the lower side of the workpiece 6. The vibration platform 13 drives the fixture 9 to vibrate at a high frequency, thereby driving the workpiece 6 to vibrate back and forth, thereby increasing the contact frequency and impact force with the abrasive particles and improving the polishing efficiency.

[0039] Furthermore, the polishing medium in the polishing liquid is selected according to the workpiece material: cerium oxide is selected when the workpiece material is quartz glass, aluminum oxide is selected when the workpiece material is stainless steel, and diamond powder is selected when the workpiece material is cast iron.

[0040] According to the above-mentioned implementation case device, the present invention shows a method for polishing the inner wall of a slender tube workpiece, comprising the following steps:

[0041] Step 1: The workpiece material of the slender tube to be processed is stainless steel, with an inner diameter of 0.3 mm, an outer diameter of 0.6 mm, and an original inner surface roughness Ra of 650 microns. 200 grams of polishing liquid is prepared by mixing 50 micron aluminum oxide, 30% hydrochloric acid solution, citric acid, and deionized water in a ratio of 30:10:5:55, and the prepared polishing liquid is stirred evenly and then sucked into the inner cavity of the piston cylinder 2.

[0042] Step 2: Place the spiral rod 7 inside the stainless steel slender tube workpiece 6, connect the outlet of the piston cylinder 2 to the vibration connector 5 through a threaded connection, and connect the two ends of the vibration connector 5 to the workpiece 6 through the internal buckle. After the overall connection, check the overall sealing of the device.

[0043] Step 3: Push the piston rods 1 at both ends of the left and right to move synchronously through the external push rod, so that the polishing liquid is pushed out by the piston cylinder 2 on one side while the polishing liquid is sucked into the piston cylinder 2 on the other side. The polishing liquid flushes back and forth on the inner surface of the workpiece 6 under the pushing action of the piston rod 1, thereby polishing the inner surface of the workpiece 6. While the polishing liquid is flowing: start the vibration platform 13 to drive the workpiece 6 to vibrate, so that the polishing liquid inside the workpiece 6 vibrates, increases the contact frequency and impact force of the workpiece 6 and the abrasive particles in the polishing liquid, and improves the processing efficiency. By adjusting the distance between the magnetic pole 12 and the spiral rod, the magnetic force and gravity on the spiral rod 7 offset each other and float in the air. By adjusting the power-on voltage of the electromagnet 11 to control the position of the spiral rod 7, the spiral rod 7 adjusts its position under the action of the electromagnetic field and is stably located in the center of the workpiece 6, so that the polishing liquid flows in a spiral, increases the fluid movement stroke, increases the proportion of effective polishing fluid in contact with the wall, and improves the polishing efficiency.

[0044] Step 4: After the processing is completed, remove the magnetic pole 12 of the magnetic control unit, turn off the vibration platform 13, remove the workpiece 6, and put it into the ultrasonic cleaning machine for cleaning.

[0045] Step 5: inspect the processed workpiece 6, and if the inner surface quality reaches the expected target, the polishing process is completed.

[0046] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A magnetic force assisted rotating fluid polishing device for the inner surface of a pipeline, characterized in that: The polishing device comprises a working platform (8), a fluid processing unit, a vibration unit, a magnetic control unit and a spiral guide unit; the workpiece (6) is a tubular structure, and its left and right ends are respectively connected to the fluid processing units on the left and right sides of the working platform (8); The spiral guide unit is a spiral rod (7) made of a magnetically conductive material and located inside the workpiece (6). The spiral structure on the surface of the spiral rod (7) guides the polishing liquid to change from the original axial linear motion to the spiral feeding motion along the tube wall, thereby increasing the fluid motion stroke and improving the polishing efficiency. The magnetic control unit is located outside the workpiece (6), and the entire magnetic control unit is located above the vibration platform (13), wherein the vibration platform (13) is located on the working platform (8); The fluid processing units are in two groups, which are installed on the left and right sides of the working platform (8) and are symmetrically arranged on both sides of the workpiece (6); The vibration unit is a vibration platform (13) located at the lower side of the workpiece (6). The vibration platform (13) drives the fixture (9) to vibrate at a high frequency to drive the workpiece (6) to vibrate back and forth, thereby increasing the contact frequency and impact strength with the abrasive particles and improving the polishing efficiency. The magnetic force control unit comprises a magnetic pole clamp (10), an electromagnet (11), and a magnetic pole (12); the two magnetic pole clamps (10) are respectively arranged at two ends of the workpiece (6), and four magnetic poles (12) are placed in each magnetic pole clamp (10), and the four magnetic poles are symmetrical about the workpiece axis origin and evenly distributed around the workpiece; the electromagnet (11) is placed directly below the workpiece (6), and the electromagnet (11) is located between the two magnetic pole clamps (10); the electromagnetic field generated by the electromagnet (11) after being energized generates a magnetic field force on the spiral rod (7), controls the spiral rod (7) to move up and down along the magnetic field direction, and then controls the radial movement of the spiral guide unit, adjusts the polishing area, and realizes uniform polishing of the inner surface of the slender tube; each group of fluid processing units comprises a piston (4), a piston cylinder (2), a piston rod (1), a vibration connecting piece (5) and a piston cylinder bracket (3); The piston cylinder (2) is fixedly connected to the working platform (8) through a piston cylinder bracket (3); a piston (4) is installed in the piston cylinder (2); the piston rod (1) is slidably connected to the inner surface of the piston cylinder (2), and polishing liquid is poured into the cavity between the front end of the piston rod (1) and the inner surface of the piston cylinder (2); the inner end of the piston rod (1) is fixedly connected to the piston (4), and the piston rod (1) is slidably connected to the opening at the outer end of the piston cylinder (2); the outlet at the inner end of the piston cylinder (2) is connected to one end of the vibration connecting piece (5), and the other end of the vibration connecting piece (5) is clamped to one end of the workpiece (6) through an internal buckle, and the vibration connecting piece (5) is communicated with the workpiece (6); the vibration connecting piece (5) is installed on a fixture (9), and the two fixtures (9) are also arranged on the vibration platform (13) and located outside the magnetic pole fixture (10).

2. A magnetic force assisted rotating fluid polishing device for the inner surface of a pipeline according to claim 1, characterized in that: The polishing medium in the polishing liquid is selected according to the material of the workpiece (6).

3. A magnetic force assisted rotating fluid polishing device for the inner surface of a pipeline according to claim 2, characterized in that: When the material of the workpiece (6) is quartz glass, cerium oxide is selected; when the material of the workpiece (6) is stainless steel, aluminum oxide is selected; when the material of the workpiece (6) is cast iron, diamond powder is selected.

4. A method for magnetically assisted rotating fluid polishing of the inner surface of a pipeline, characterized in that: The polishing method uses the magnetic force assisted rotating fluid polishing device for polishing the inner surface of the pipeline according to any one of claims 1 to 3, and comprises the following steps: Step 1: Select a suitable polishing medium according to the material of the workpiece (6) to prepare a polishing liquid, stir the prepared polishing liquid evenly and then suck it into the inner cavity of the piston cylinder (2); Step 2: connect the outlet of the piston cylinder (2) to the vibration connector (5), connect the two ends of the workpiece (6) through the internal buckle of the vibration connector (5), and check the overall sealing of the device after the overall connection; Step 3: Push the piston rods (1) at the left and right ends to move synchronously, ensuring that the polishing liquid is pushed out by the piston cylinder (2) on one side while the polishing liquid is sucked into the piston cylinder (2) on the other side. The polishing liquid flushes the inner surface of the workpiece (6) back and forth under the pushing action of the piston rod (1), and the inner surface of the workpiece (6) is polished. While the polishing liquid flows: the workpiece (6) is driven to vibrate by starting the vibration platform (13), so that the polishing liquid inside the workpiece (6) vibrates, thereby improving the processing efficiency. By adjusting the distance between the magnetic pole (12) and the spiral rod (7), the magnetic force and gravity on the spiral rod (7) are offset and the spiral rod (7) is suspended in the air. By adjusting the power supply voltage of the electromagnet (11), the position of the spiral rod (7) is controlled, so that the spiral rod (7) adjusts its position under the action of the electromagnetic field and is stably located in the center of the workpiece (6), so that the polishing liquid flows in a spiral, the fluid movement stroke is increased, the proportion of effective polishing fluid in contact with the wall surface is increased, and the polishing efficiency is improved. Step 4: After the processing is completed, remove the magnetic pole (12) of the magnetic control unit, turn off the vibration platform (13), and remove the workpiece (6) for cleaning; Step 5: inspect the processed workpiece (6). If the inner surface quality reaches the expected target, the polishing process is completed. If it does not meet the requirements, repeat the above process.

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