An elongated straight tube bore polishing apparatus and method

Abstract

The application discloses an elongated straight pipe inner hole polishing device and method, the polishing device comprises a workbench, a steel wire rope polishing unit, a flushing and air-drying unit and an abrasive polishing unit, the steel wire rope polishing unit comprises a motor, a steel wire rope clamp, a grinding paste hopper, a transmission device, a workpiece clamp, a grinding paste recovery device and a protection device. Since the steel wire rope has a certain rigidity, the swing generated during rotation can produce polishing effect on the inner hole, and the spiral structure of the steel wire rope facilitates the transportation of the grinding paste into the inner hole, so that the grinding paste is supplied for polishing without special polishing rope or feeding device. The application only needs to clamp the steel wire rope and the workpiece for machining, the consumables are convenient and easy to obtain, the repeated use of the grinding paste is energy-saving and environment-friendly, and the overall structure is simple and convenient to operate. In addition to the steel wire rope polishing, the application also adjusts and polishes the polishing liquid to further improve the polishing effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of precision machining, and particularly relates to a polishing device and method for the inner hole of an elongated straight pipe. BACKGROUND

[0002] With the miniaturization of modern high-end precision equipment, flow channel parts with small caliber, variable diameter and elongated features are widely used in the fields of aerospace, biomedicine and chemical industry, and bear the functions of sample extraction, fluid delivery, heat conduction and heat dissipation. Due to manufacturing methods and other reasons, the surface of the inner flow channel of a workpiece manufactured by additive manufacturing and other methods is very rough and has various defects, which can easily cause problems such as large flow resistance of the flow channel, liquid residue and powder shedding during use. Therefore, it is necessary to use polishing and other methods to improve the surface quality of the inner flow channel and thus improve the flow characteristics of the internal fluid. However, the polishing effect of traditional polishing methods on small-size, large-length-diameter-ratio and complex-structure inner flow channel parts cannot meet the requirements.

[0003] For polishing of elongated pipe fittings, the existing methods generally include electrolytic polishing, centrifugal polishing and magnetic polishing. Electrolytic polishing uses a workpiece as an anode to dissolve by means of oxidation-reduction reaction, but it is impossible to design a cathode for complex flow channel parts, and thus it is impossible to achieve polishing of complex flow channels. Mechanical polishing must be performed before electrolytic polishing to remove oxide skin, and electrolytic polishing has certain requirements for the inner wall roughness. Centrifugal polishing achieves polishing effect through centrifugal movement of the workpiece and abrasive on the centrifugal disc. Magnetic force grinding uses a magnet to drive magnetic particles in the pipe for polishing, but the magnetic force cannot effectively control the magnetic particles inside the flow channel for complex flow channel parts with large wall thickness. Centrifugal polishing and magnetic force polishing can only achieve micro cutting and are not suitable for polishing of elongated pipe fittings with large cutting amount and large batch, and the efficiency is relatively low. Abrasive flow method can also be used to process elongated pipes, but abrasive flow processing requires a certain pressure to inject fluid to complete the processing. If the pressure is small, the processing of the surface of the workpiece cannot be completed, but if the pressure is large, the surface of the workpiece will be damaged to a certain extent.

[0004] At present, the devices for polishing the inner surface by mechanical polishing method have the problem that the size of the tool head limits the mechanical polishing method. The polishing tools are mostly polishing discs and polishing rollers, which can only polish large-caliber flow channels with an inner diameter of dozens of millimeters, and have the problems of complex transmission mechanism and low polishing efficiency. The polishing method using polishing ropes has the problem that the movement direction of the polishing ropes in the hole is mostly parallel to the axis of the inner hole of the workpiece, and the polishing is performed by rotating the polishing ropes around the axis of the inner hole. The two ends of the polishing ropes are fixed, and the polishing is performed by spreading the polishing ropes by centrifugal force. This method also cannot adapt to the polishing of elongated variable-diameter inner holes.

[0005] The existing patents related to polishing of elongated variable-diameter inner holes are as follows:

[0006] The Chinese patent CN115464541A designs an intelligent polishing machine for the inner hole of an elongated pipe, which passes a polishing rope with radial bristles through a workpiece by winding it around several pulleys and connects the polishing rope at both ends with a threaded cylinder and a threaded pin. On the one hand, this patent requires a special traction rope with radial bristles as a polishing consumable, and connecting the traction rope at both ends requires installing a threaded cylinder and a threaded pin at both ends of the traction rope. Due to the size limitation of the threaded cylinder, it cannot polish smaller inner holes, and the polishing rope needs to pass through tensioning wheels, guide wheels and other structures before polishing, which takes a long time to prepare. On the other hand, the polishing rope in the inner hole is parallel to the inner hole axis. For variable-diameter inner holes, selecting smaller bristles will weaken the polishing effect of the large-diameter part, and selecting larger bristles will be affected by the small-diameter size and even unable to enter.

[0007] The Chinese patent CN206998477U is an inner hole polishing machine for an elongated pipe, which passes a yarn through a workpiece by winding it around several pulleys and connects it at both ends. There is an abrasive outlet at one end of the workpiece to release abrasive, which is brought into the inner hole for polishing by the movement of the yarn. On the one hand, this patent drives the abrasive into the inner hole of the workpiece for polishing by the yarn passing through the workpiece. The direction of the yarn in the inner hole is parallel to the inner hole axis, making it difficult to polish variable-diameter inner holes. On the other hand, the yarn needs to be wound around tensioning wheels, guide wheels and other structures, which takes a long time to prepare before polishing.

[0008] The Chinese patent CN108555733A discloses a device for fine grinding the inner surface of a medical syringe needle, which uses a bundle of several diamond abrasive wires as a polishing rope. The centrifugal force generated by rotation causes the abrasive wire bundle to spread into several parallel abrasive wires in the inner hole for polishing. This patent is specifically designed for polishing the inner surface of a medical syringe needle, and several diamond abrasive wires need to be passed through the workpiece and bundled at both ends, which takes a long time to prepare. For polishing of variable-diameter inner holes, the polishing effect of the large-diameter part is poor due to the small-diameter size, and even cannot be polished.

[0009] The above patents and other elongated tube inner surface polishing devices are mainly for uniform-diameter inner holes or larger-diameter inner holes, and cannot meet the polishing requirements of small-diameter variable-diameter elongated holes. Therefore, it is urgent to provide a polishing device and method for small-diameter variable-diameter elongated holes to ensure polishing efficiency and precision. SUMMARY

[0010] To solve the above problems in the prior art, the present application designs an inner hole polishing device and method for an elongated straight pipe, which realizes uniform polishing of the inner surface of an elongated variable-diameter straight pipe with controllable polishing intensity and improves the quality of the inner hole surface.

[0011] To achieve the above-mentioned purpose, the technical solution of the present application is as follows: an inner hole polishing device for an elongated straight pipe, comprising a workbench, a steel wire rope polishing unit, a flushing and drying unit and an abrasive polishing unit.

[0012] The steel wire rope polishing unit comprises a motor, a steel wire rope clamp, a grinding paste hopper, a transmission device, a workpiece clamp, a grinding paste recovery device and a protection device, the motor is fixedly installed on the left side of the workbench, the output shaft of the motor is connected with the steel wire rope clamp, the steel wire rope clamp is fixedly connected with the left end of the steel wire rope, the right end of the steel wire rope extends into the inner hole of the workpiece or extends out at the right end of the workpiece; the grinding paste hopper is fixedly installed above the steel wire rope through a hopper support; the workpiece is installed on the workbench through the transmission device and the workpiece clamp, the transmission device is installed on the workbench and is in contact connection with the protection device; the protection device is nested at the left end inlet of the workpiece; the grinding paste recovery device is installed on the right side of the workbench and below the right end of the workpiece.

[0013] Further, the flushing and air-drying unit comprises a water pump and an air pump, both of which are installed on the workbench, the outlets of the water pump and the air pump are connected with the left end of the workpiece through a three-way joint, a recovery box is installed on the workbench below the right end of the workpiece; the workpiece is installed on the workbench through the workpiece clamp.

[0014] Further, the abrasive polishing unit comprises a polishing liquid pump, a polishing liquid tank and a connecting support, the inlet of the polishing liquid pump is connected with the outlet of the polishing liquid tank through a water pipe, the outlet is connected with one end of the workpiece through a water pipe, the other end of the workpiece is connected with the inlet of the polishing liquid tank through a water pipe, and the workpiece is installed on the workbench through the connecting support.

[0015] Further, the steel wire rope comprises a fine steel wire rope, a medium steel wire rope and a thick steel wire rope, the diameter of the fine steel wire rope matches the small-diameter inner hole of the workpiece, the diameter of the thick steel wire rope matches the large-diameter inner hole of the workpiece, and the diameter of the medium steel wire rope is smaller than that of the thick steel wire rope and larger than that of the fine steel wire rope.

[0016] Further, the grinding paste hopper is installed between the steel wire rope clamp and the workpiece.

[0017] Further, the workpiece clamp comprises a cylindrical seat and two vertical rods, the two vertical rods are fixed on the cylindrical seat, and the distance between the two vertical rods is greater than the outer diameter of the workpiece; the cylindrical seat is installed on the workbench through a rotating shaft, and the two vertical rods are brought into contact with the workpiece by rotating the cylindrical seat.

[0018] Further, the transmission device comprises a spring, an L-shaped transmission frame, a thrust bearing, a rubber disc, an eccentric transmission wheel and a transmission motor, the center hole of the rubber disc is in interference fit with the outer circular surface of the plastic tube of the protection device, the two side surfaces of the rubber disc are respectively fixedly connected with the thrust bearing, the thrust bearing is in sliding connection with the guide rail, and the guide rail is fixed on the workbench through the connecting piece. The outer circular surface of the rubber disc is in contact with the upper surface of the eccentric transmission wheel, the eccentric transmission wheel is connected with the transmission motor, and the transmission motor is fixed on the workbench; the left side surface of the eccentric transmission wheel is in contact with the right side surface of the vertical plate of the L-shaped transmission frame, the horizontal plate of the L-shaped transmission frame is fixedly connected with the thrust bearing, and the left side surface of the vertical plate of the L-shaped transmission frame is fixedly connected with one end of the spring, and the other end of the spring is fixed on the workbench.

[0019] When the eccentric transmission wheel rotates, the upper surface of the eccentric transmission wheel drives the rubber disc to rotate through friction, and in turn drives the workpiece to rotate; at the same time, when the eccentric transmission wheel rotates, the L-shaped transmission frame is pushed to reciprocate along the axial direction of the workpiece, and in turn drives the workpiece to reciprocate along the axial direction of the workpiece through the thrust bearing and the rubber disc.

[0020] Further, the protection device comprises a metal tube and a plastic tube, the left segment of the inner side of the plastic tube is nested on the metal tube, and the right segment of the inner side of the plastic tube is nested on the workpiece; the metal tube has the same inner and outer diameters as the workpiece.

[0021] An inner hole polishing method of an elongated straight pipe, which is polished by using the inner hole polishing device of the elongated straight pipe, comprises the following steps.

[0022] Step one, selecting appropriate grinding paste according to the material of the workpiece, and selecting appropriate diameter of the coarse steel wire rope, the medium steel wire rope and the fine steel wire rope according to the inner diameter and the length of the workpiece.

[0023] Step two, fixing the workpiece through the transmission device and the workpiece clamp, and adding appropriate amount of grinding paste in the grinding paste hopper.

[0024] Step three, after applying appropriate amount of grinding paste on the steel wire rope, clamping the steel wire rope by the steel wire rope clamp, and inserting the steel wire rope into the inner hole through the protection device; if it is a fine steel wire rope, the right end of the steel wire rope is stretched out of the right end of the workpiece; otherwise, the right end of the steel wire rope is stretched to the inner hole variable diameter position of the workpiece.

[0025] Step four, observing the rotation direction of the steel wire rope, ensuring that the rotation direction of the motor is opposite to the rotation direction of the steel wire rope, controlling the rotation speed of the motor, and at the same time making the grinding paste enter the hole under the spiral action of the steel wire rope, until the grinding paste flows out from the outlet end of the workpiece and is collected by the grinding paste recovery device. At the same time, the workpiece and the steel wire rope are controlled to rotate in opposite directions and to shake back and forth along the axial direction by the transmission device.

[0026] Step five, keeping the workpiece moving, and keeping the motor at a high speed after the grinding paste flows out from the outlet end of the workpiece for polishing.

[0027] Step six, if the three diameter wire rope is used once, turn to step seven, otherwise change another diameter wire rope, turn to step two.

[0028] Step seven, the motor stops, the workpiece is removed for flushing until there is no abrasive paste residue in the inner hole.

[0029] Step eight, the polishing liquid is prepared and poured into the polishing liquid tank of the abrasive polishing unit, the workpiece is installed to the abrasive polishing unit, the air tightness is checked, and the workpiece is put into the abrasive polishing unit for polishing.

[0030] Step nine, the workpiece is installed to the flushing and air drying unit for flushing and air drying.

[0031] Step ten, the inner hole of the air dried workpiece is detected, and the inner surface quality reaches the expected target, and the polishing process is completed.

[0032] Further, in the step five, the abrasive paste in the abrasive paste recovery device is taken out and put back into the abrasive paste hopper.

[0033] Compared with the prior art, the beneficial effects of the present application are as follows:

[0034] 1. Since the wire rope has a certain stiffness, the swing generated during rotation can polish the inner hole, and the spiral structure of the wire rope facilitates the transportation of the abrasive paste into the inner hole, without the need for special polishing ropes or feeding devices to supply abrasive paste for polishing.

[0035] 2. The present application only needs to clamp the wire rope and the workpiece for processing, the consumables used are convenient and easy to obtain, the abrasive paste is reused, energy saving and environmental protection; the overall structure is simple and convenient to operate.

[0036] 3. The whole wire rope of the present application has high polishing processing efficiency for each part of the inner hole of the workpiece, for variable diameter workpieces, first use a fine wire rope to polish the small diameter position, at this time there is also a certain polishing effect on the large diameter position, then use a thick wire rope to polish the large diameter position, and the small diameter position is not affected.

[0037] 4. In addition to the polishing of the wire rope, the present application also prepares a polishing liquid for polishing, further improving the polishing effect. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a schematic diagram of the polishing unit of the present application polishing the small diameter inner hole.

[0039] Figure 2 It is a schematic diagram of the polishing unit of the present application polishing the large diameter inner hole.

[0040] Figure 3 It is a schematic diagram of the flushing and air drying unit structure of the present application.

[0041] Figure 4 Structure diagram of abrasive polishing unit of the present application.

[0042] Figure 5 Structure diagram of variable-diameter workpiece processed by the present application.

[0043] Figure 6 Structure diagram of transmission device of the present application.

[0044] Figure 7 Structure diagram of workpiece clamp of the present application.

[0045] Figure 8 Structure diagram of Figure 7 top view.

[0046] Figure 9 Structure diagram of protection device of the present application.

[0047] In the figure: 1, motor; 2, steel wire rope clamp; 3, abrasive paste hopper; 4, transmission device; 5, workpiece clamp; 6, workbench; 7, protection device; 8, workpiece; 9, steel wire rope; 10, abrasive paste recovery device; 11, air pump; 12, water pump; 13, recovery tank; 14, polishing liquid pump; 15, polishing liquid tank; 16, connecting bracket; 401, spring; 402, L-shaped transmission frame; 403, thrust bearing; 404, rubber disc; 405, guide rail; 406, connecting piece; 407, transmission motor; 408, eccentric transmission wheel; 701, metal pipe; 702, plastic pipe. DETAILED DESCRIPTION

[0048] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be described in detail below in combination with the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present application.

[0049] As Figures 1-9 shown, an elongated straight pipe hole polishing device includes a workbench 6, a steel wire rope 9 polishing unit, a flushing and air-drying unit, and an abrasive polishing unit.

[0050] The steel wire rope polishing unit comprises a motor 1, a steel wire rope clamp 2, a grinding paste hopper 3, a transmission device 4, a workpiece clamp 5, a grinding paste recovery device 10 and a protection device 7, the motor 1 is fixedly installed on the left side of a workbench 6, the output shaft of the motor 1 is connected with the steel wire rope clamp 2, the steel wire rope clamp 2 is fixedly connected with the left end of a steel wire rope 9, the right end of the steel wire rope 9 extends into or out of the right end of a workpiece 8; the grinding paste hopper 3 is fixedly installed above the steel wire rope 9 through a hopper support; the workpiece 8 is installed on the workbench 6 through the transmission device 4 and the workpiece clamp 5, the transmission device 4 is installed on the workbench 6 and is in contact connection with the protection device 7; the protection device 7 is nested at the left end inlet of the workpiece 8; the grinding paste recovery device 10 is installed on the right side of the workbench 6 and below the right end of the workpiece 8.

[0051] Further, the flushing and air-drying unit comprises a water pump 12, an air pump 11 and a three-way joint, the water pump 12 and the air pump 11 are both installed on the workbench 6, the outlets of the water pump 12 and the air pump 11 are both connected with the left end of the workpiece 8 through the three-way joint, a recovery box 13 is installed on the workbench 6 below the right end of the workpiece 8; the workpiece 8 is installed on the workbench 6 through the workpiece clamp 5.

[0052] Further, the abrasive polishing unit comprises a polishing liquid pump 14, a polishing liquid tank 15 and a connecting support 16, the inlet of the polishing liquid pump 14 is connected with the outlet of the polishing liquid tank 15 through a water pipe, the outlet is connected with one end of the workpiece 8 through a water pipe, the other end of the workpiece 8 is connected with the inlet of the polishing liquid tank 15 through a water pipe, the workpiece 8 is installed on the workbench 6 through the connecting support 16.

[0053] Further, the steel wire rope comprises a thin steel wire rope, a medium steel wire rope and a thick steel wire rope, the diameter of the thin steel wire rope matches the small-diameter inner hole of the workpiece 8, the diameter of the thick steel wire rope matches the large-diameter inner hole of the workpiece 8, the diameter of the medium steel wire rope is smaller than that of the thick steel wire rope and larger than that of the thin steel wire rope.

[0054] Further, the grinding paste hopper 3 is installed between the steel wire rope clamp 2 and the protection device 7.

[0055] Further, the workpiece clamp 5 comprises a cylindrical seat and two vertical rods, the two vertical rods are fixed on the cylindrical seat, the distance between the two vertical rods is greater than the outer diameter of the workpiece 8; the cylindrical seat is installed on the workbench 6 through a rotating shaft, the two vertical rods are brought into contact with the workpiece 8 by rotating the cylindrical seat.

[0056] Further, the transmission device 4 comprises a spring 401, an L-shaped transmission frame 402, a thrust bearing 403, a rubber disc 404, an eccentric transmission wheel 408 and a transmission motor 407, the center hole of the rubber disc 404 is in interference fit with the outer circular surface of the plastic tube 702 of the protection device 7, the two side surfaces of the rubber disc 404 are fixedly connected with the thrust bearing 403 respectively, the thrust bearing 403 is slidably connected with a guide rail 405 through a connecting piece 406, and the guide rail 405 is fixed on the workbench 6. The outer circular surface of the rubber disc 404 is in contact with the upper surface of the eccentric transmission wheel 408, the eccentric transmission wheel 408 is connected with the transmission motor 407, and the transmission motor 407 is fixed on the workbench 6; the left side surface of the eccentric transmission wheel 408 is in contact with the right side surface of the vertical plate of the L-shaped transmission frame 402, the horizontal plate of the L-shaped transmission frame 402 is fixedly connected with the thrust bearing 403, and the left side surface of the vertical plate of the L-shaped transmission frame 402 is fixedly connected with one end of the spring 401, and the other end of the spring 401 is fixed on the workbench 6.

[0057] When the eccentric transmission wheel 408 rotates, the upper surface of the eccentric transmission wheel 408 drives the rubber disc 404 to rotate through friction and in turn drives the workpiece 8 to rotate; at the same time, when the eccentric transmission wheel 408 rotates, the L-shaped transmission frame 402 is pushed to reciprocate along the axial direction of the workpiece 8, and in turn drives the workpiece 8 to reciprocate along the axial direction of the workpiece 8 through the thrust bearing 403 and the rubber disc 404.

[0058] Further, the protection device 7 comprises a metal tube 701 and a plastic tube 702, the left segment of the inner side of the plastic tube 702 is nested on the metal tube 701, and the right segment of the inner side of the plastic tube 702 is nested on the workpiece 8; the metal tube 701 has the same inner and outer diameters as the workpiece 8.

[0059] The working principle of the application is as follows:

[0060] When the steel wire rope 9 is polished, the motor 1 drives the steel wire rope clamp 2 to rotate; the steel wire rope clamp 2 drives the steel wire rope 9 to rotate; the steel wire rope 9 carries the grinding paste flowing out of the grinding paste hopper 3 into the inner hole of the workpiece 8 for polishing; the protection device 7 is located in front of the inlet end of the workpiece 8; the workpiece 8 is fixed by the workpiece clamp 5; the transmission device 4 drives the protection device 7 and the workpiece 8 to rotate in the opposite direction of the rotation of the steel wire rope 9 and to have a small axial reciprocating motion; and the grinding paste recovery device 10 is used for recycling the grinding paste for recycling.

[0061] When the abrasive polishing is performed, the polishing liquid prepared in a certain proportion is first added into the polishing liquid tank 15, and then the polishing liquid is pumped out by the polishing liquid pump 14 and pumped into the workpiece 8 to polish the workpiece 8.

[0062] When rinsing, first use the air pump 11 to blow out the residual polishing paste in the inner hole of the workpiece 8 into the recovery box 13; then use the water pump 12 to perform water rinsing, and a certain amount of detergent can be added to improve the decontamination ability.

[0063] When air drying, the air pump 11 is used to air dry the moisture in the workpiece 8.

[0064] The embodiment of the present application is as follows: a polishing method for the inner hole of an elongated straight pipe, which is polished by using the polishing device for the inner hole of an elongated straight pipe, and comprises the following steps:

[0065] Step one, select W40 diamond grinding paste, 0.6mm steel wire rope 9, 1.2mm steel wire rope 9, and 0.8mm steel wire rope 9 for polishing.

[0066] Step two, fix the workpiece 8 with the workpiece clamp 5, and add appropriate amount of grinding paste in the grinding paste hopper 3.

[0067] Step three, first take the 0.6mm steel wire rope 9, smear the polishing paste, pass through the protection device 7, extend into the inner hole of the workpiece 8 from the coarse port position, and expose 2-3mm from the fine end, and clamp with the steel wire rope clamp 2.

[0068] Step four, observe the rotation direction of the steel wire rope 9, ensure that the rotation direction of the motor 1 is opposite to the rotation direction of the steel wire rope 9, control the rotation speed, and at the same time make the grinding paste enter the hole under the spiral action of the steel wire rope 9, until it flows out from the outlet end of the workpiece 8, and is collected by the grinding paste recovery device 10. At the same time, ensure that the workpiece 8 and the steel wire rope 9 rotate in opposite directions, and move back and forth along the axial direction.

[0069] Step five, keep the workpiece 8 moving, after the grinding paste flows out from the outlet end of the workpiece 8, keep the motor 1 at a high speed for polishing for 30min, and the grinding paste of the grinding paste recovery device 10 can be added to the grinding paste hopper 3 again.

[0070] Step six, take the 1.2mm steel wire rope 9, and repeat steps two, three, four, and five for polishing for 10min.

[0071] Step seven, take the 0.8mm steel wire rope 9, and repeat steps two, three, four, and five for polishing for 20min.

[0072] Step eight, after the processing is completed, the motor 1 is stopped, the workpiece 8 is removed for rinsing, until there is no residual grinding paste in the inner hole.

[0073] Step nine, prepare the polishing liquid, pour it into the polishing liquid tank 15 of the abrasive polishing unit, install the workpiece 8 to the abrasive polishing unit, and check the air tightness.

[0074] Step ten, start the polishing liquid pump 14 to polish.

[0075] Step eleven, polishing is finished, the workpiece 8 is rinsed and air dried.

[0076] Step twelve, the processed workpiece 8 is detected, the inner surface quality reaches the expected target, and the polishing process is finished.

[0077] The principles and implementation manners of the present application are described by applying specific examples in the present application, and the above examples are only used to help understand the method and core idea of the present application. The above description is only the preferred implementation manner of the present application, and it should be pointed out that, due to the limitedness of the expression, there are infinite specific structures, and for ordinary skilled in the art, some improvements, refinements or changes can be made without departing from the principles of the present application, and the above technical features can also be combined in a proper manner; the improvements, refinements, changes or combinations, or the direct application of the application concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present application.

Claims

1. A polishing device for the inner hole of a slender straight tube, characterized in that: Includes a workbench (6), a wire rope polishing unit, a rinsing and drying unit, and an abrasive polishing unit; The wire rope polishing unit includes a motor (1), a wire rope clamp (2), a polishing paste hopper (3), a transmission device (4), a workpiece clamp (5), a polishing paste recovery device (10), and a protection device (7). The motor (1) is fixedly installed on the left side of the workbench (6). The output shaft of the motor (1) is connected to the wire rope clamp (2). The wire rope clamp (2) is fixedly connected to the left end of the wire rope (9). The right end of the wire rope (9) extends into the inner hole of the workpiece (8) or extends out through the inner hole of the workpiece (8). Outside the right end of the workpiece (8); the grinding paste hopper (3) is fixedly installed above the wire rope (9) by a hopper bracket; the workpiece (8) is installed on the workbench (6) by a transmission device (4) and a workpiece clamp (5), the transmission device (4) is installed on the workbench (6) and is in contact with the protective device (7); the protective device (7) is nested at the left end of the workpiece (8); the grinding paste recycling device (10) is installed on the right side of the workbench (6) and located below the right end of the workpiece (8); The transmission device (4) includes a spring (401), an L-shaped transmission frame (402), a thrust bearing (403), a rubber disc (404), an eccentric transmission wheel (408), and a transmission motor (407). The central hole of the rubber disc (404) is interference-fitted with the outer surface of the plastic tube (702) of the protective device (7). The two sides of the rubber disc (404) are fixedly connected to the thrust bearing (403). The thrust bearing (403) is slidably connected to the guide rail (405) through a connector (406). The guide rail (405) is fixed on the worktable (6). The outer surface of (404) contacts the upper surface of the eccentric transmission wheel (408), the eccentric transmission wheel (408) is connected to the transmission motor (407), and the transmission motor (407) is fixed on the worktable (6); the left side of the eccentric transmission wheel (408) contacts the right side of the vertical plate of the L-shaped transmission frame (402), the horizontal plate of the L-shaped transmission frame (402) is fixedly connected to the thrust bearing (403), the left side of the vertical plate of the L-shaped transmission frame (402) is fixedly connected to one end of the spring (401), and the other end of the spring (401) is fixed on the worktable (6); When the eccentric drive wheel (408) rotates, the upper surface of the eccentric drive wheel (408) drives the rubber disc (404) to rotate through friction, thereby driving the workpiece (8) to rotate; at the same time, when the eccentric drive wheel (408) rotates, it pushes the L-shaped drive frame (402) to reciprocate along the axis of the workpiece (8), thereby driving the workpiece (8) to reciprocate along the axis of the workpiece (8) through the thrust bearing (403) and the rubber disc (404).

2. The polishing device for the inner hole of a slender straight tube according to claim 1, characterized in that: The rinsing and drying unit includes a water pump (12), an air pump (11), and a three-way connector. The water pump (12) and the air pump (11) are both installed on the workbench (6). The outlets of the water pump (12) and the air pump (11) are connected to the left end of the workpiece (8) through the three-way connector. A recycling box (13) is installed on the workbench (6) below the right end of the workpiece (8). The workpiece (8) is installed on the workbench (6) through the workpiece clamp (5).

3. The polishing device for the inner hole of a slender straight tube according to claim 1, characterized in that: The abrasive polishing unit includes a polishing liquid pump (14), a polishing liquid tank (15), and a connecting bracket (16). The inlet of the polishing liquid pump (14) is connected to the outlet of the polishing liquid tank (15) through a water pipe, and the outlet is connected to one end of the workpiece (8) through a water pipe. The other end of the workpiece (8) is connected to the inlet of the polishing liquid tank (15) through a water pipe. The workpiece (8) is mounted on the workbench (6) through the connecting bracket (16).

4. The polishing device for the inner hole of a slender straight tube according to claim 1, characterized in that: The wire rope (9) includes a thin wire rope (9), a medium wire rope (9) and a thick wire rope (9). The diameter of the thin wire rope (9) matches the small diameter inner hole of the workpiece (8), the diameter of the thick wire rope (9) matches the large diameter inner hole of the workpiece (8), and the diameter of the medium wire rope (9) is smaller than the diameter of the thick wire rope (9) and larger than the diameter of the thin wire rope (9).

5. The polishing device for the inner hole of a slender straight tube according to claim 1, characterized in that: The grinding paste hopper (3) is installed between the wire rope clamp (2) and the protective device (7).

6. The polishing device for the inner hole of a slender straight tube according to claim 1, characterized in that: The workpiece fixture (5) includes a cylindrical base and two uprights. The two uprights are fixed on the cylindrical base, and the distance between the two uprights is greater than the outer diameter of the workpiece (8). The cylindrical base is mounted on the worktable (6) via a rotating shaft. The two uprights are brought into contact with the workpiece (8) by rotating the cylindrical base.

7. The polishing device for the inner hole of a slender straight tube according to claim 1, characterized in that: The protective device (7) includes a metal tube (701) and a plastic tube (702). The left section of the inner side of the plastic tube (702) is nested on the metal tube (701), and the right section of the inner side of the plastic tube (702) is nested on the workpiece (8). The inner and outer diameters of the metal tube (701) and the workpiece (8) are the same.

8. A method for polishing the inner hole of a slender straight tube, characterized in that: Polishing using any of the slender straight tube inner hole polishing devices described in claims 1-7 includes the following steps: Step 1: Select appropriate grinding paste according to the material of workpiece (8), and select appropriate diameter coarse steel wire rope (9), medium steel wire rope (9) and fine steel wire rope (9) according to the inner diameter and length of workpiece (8). Step 2: Fix the workpiece (8) with the transmission device (4) and the workpiece clamp (5), and add an appropriate amount of grinding paste to the grinding paste hopper (3); Step 3: After applying an appropriate amount of polishing paste to the wire rope (9), clamp the wire rope (9) with the wire rope clamp (2) and pass it through the protective device (7) into the inner hole; if it is a thin wire rope (9), extend the right end of the wire rope (9) out of the right end of the workpiece (8); otherwise, extend the right end of the wire rope (9) to the diameter change point of the inner hole of the workpiece (8); Step 4: Observe the direction of rotation of the wire rope (9) to ensure that the rotation direction of the motor (1) is opposite to that of the wire rope (9). While controlling the speed of the motor (1), the grinding paste is continuously introduced into the hole by the spiral action of the wire rope (9) until it flows out from the outlet end of the workpiece (8) and is collected by the grinding paste recovery device (10). At the same time, the workpiece (8) is controlled to rotate in the opposite direction to the wire rope (9) through the transmission device (4) and to sway back and forth along the axial direction. Step 5: Keep the workpiece (8) moving. After the polishing paste flows out from the outlet end of the workpiece (8), keep the motor (1) at a high speed for polishing. Step 6: If all three diameter wire ropes (9) have been used once, proceed to Step 7; otherwise, replace with another diameter wire rope (9) and proceed to Step 2. Step 7: Stop the motor (1), remove the workpiece (8) and rinse it until there is no grinding paste residue in the inner hole; Step 8: Pour the polishing liquid into the polishing liquid tank (15) of the abrasive polishing unit, install the workpiece (8) into the abrasive polishing unit, check the airtightness, and put the workpiece (8) into the abrasive polishing unit for polishing. Step 9: Install the workpiece (8) into the rinsing and drying unit for rinsing and drying; Step 10: Inspect the inner hole of the dried workpiece (8). If the inner surface quality meets the expected target, the polishing process is completed.

9. The method for polishing the inner hole of a slender straight tube according to claim 8, characterized in that: In step five, the grinding paste in the grinding paste recovery device (10) is taken and put back into the grinding paste hopper (3).

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