Device and method for polishing inner hole of slender straight pipe

Abstract

The invention discloses a long and thin straight pipe inner hole polishing device and method, the polishing device comprises a workbench, a steel wire rope polishing unit, a washing and air drying unit and an abrasive material polishing unit, and the steel wire rope polishing unit comprises a motor, a steel wire rope clamp, an abrasive paste hopper, a transmission device, a workpiece clamp, an abrasive paste recovery device and a protection device. Due to the fact that the steel wire rope has certain rigidity, swinging generated during rotation can generate a polishing effect on the inner hole, the abrasive paste can be conveniently conveyed into the inner hole due to the spiral structural characteristic of the steel wire rope, and a special polishing rope or a feeding device is not needed for supplying the abrasive paste for polishing. Machining can be carried out only by installing and clamping the steel wire rope and the workpiece, used consumables are convenient and easy to obtain, grinding paste is repeatedly used, and energy saving and environment protection are achieved; the overall structure is simple and operation is convenient. Besides steel wire rope polishing, polishing liquid is prepared for polishing, and the polishing effect is further improved.

Description

Technical Field

[0001] The invention belongs to the field of precision machining, and in particular relates to a device and method for polishing the inner hole of a slender straight tube. Background Art

[0002] As modern high-end precision equipment tends to be miniaturized, flow channel parts with small diameter, variable diameter, and slender features are widely used in aerospace, biomedicine, chemical and chemical industries, and are used for sample extraction, fluid transportation, heat conduction and heat dissipation, etc. Due to manufacturing methods and other reasons, the surface of the internal flow channel of the workpiece manufactured by additive manufacturing and other methods is very rough and has various defects. During use, it is easy to cause problems such as large flow resistance, liquid residue, and powder shedding. Therefore, it is necessary to use polishing and other methods to improve the surface quality of the internal flow channel to improve the flow characteristics of the internal fluid. However, the traditional polishing method is difficult to meet the needs of polishing the internal flow channel parts with small size, large aspect ratio, and complex structure.

[0003] When polishing slender pipe fittings, the existing methods generally include electrolytic polishing, centrifugal polishing and magnetic polishing. Electrolytic polishing uses redox reaction to dissolve the workpiece as the anode, but it is impossible to design a cathode for complex flow channel parts, and it is impossible to achieve the polishing of complex flow channels. Mechanical polishing must be performed before electrolytic polishing to remove the oxide scale, and electrolytic polishing has certain requirements for the roughness of the inner wall. Centrifugal polishing achieves the polishing effect through the centrifugal movement of the workpiece and abrasive on the centrifugal disk. Magnetic grinding uses magnets to drive the magnetic particles in the tube for polishing, but for complex flow channel parts with thick walls, the magnetic force cannot effectively control the magnetic particles inside the flow channel. Centrifugal polishing and magnetic polishing can only achieve micro-cutting, which is not suitable for polishing slender pipe fittings with large cutting volume and large quantities, and the efficiency is relatively low. The abrasive flow method can also be used to process slender tubes, but abrasive flow processing requires a certain pressure to inject the fluid to complete the processing. If the pressure is small, the surface of the workpiece cannot be processed, but if the pressure is large, it will be destructive to the surface of the workpiece.

[0004] At present, the devices that use mechanical polishing methods to polish the inner surface mostly 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-diameter flow channels with an inner diameter of tens of millimeters, and there are problems such as complex transmission mechanisms and low polishing efficiency. The method of polishing with a polishing rope has the movement direction of the polishing rope in the hole parallel to the axis of the inner hole of the workpiece. The polishing is performed by rotating the polishing rope around the axis of the inner hole. Both ends of the polishing rope are fixed, and the polishing rope is spread out by centrifugal force for polishing. It is also unable to adapt to the problem of polishing slender and variable-diameter inner holes.

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

[0006] Chinese patent CN115464541A designs an intelligent polishing machine for the inner holes of slender pipes. A polishing rope with radial bristles is passed around several pulleys and inserted into the workpiece, and the polishing rope is connected end to end with a threaded barrel 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 end to end requires installing a threaded barrel and a threaded pin at both ends of the traction rope respectively. Due to the size limitation of the threaded barrel, it is not possible to polish smaller inner holes, and the polishing rope needs to pass around structures such as tensioning wheels and guide wheels before polishing, and the preparation work takes a long time. On the other hand, the polishing rope in the inner hole is parallel to the axis of the inner hole. For variable diameter inner holes, choosing smaller bristles will weaken the polishing effect of the large diameter part, and choosing larger bristles will be affected by the size of the small diameter and may even make it impossible to enter.

[0007] Chinese patent CN206998477U is a polishing machine for inner holes of slender pipes, which passes the yarn around several pulleys and penetrates into the workpiece and connects the end to the end. There is an abrasive opening at one end of the workpiece to release the abrasive, and the abrasive is brought into the inner hole for polishing through the movement of the yarn. On the one hand, the 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 axis of the inner hole, which makes it difficult to polish the variable diameter inner hole; on the other hand, the yarn needs to be wrapped around the tension wheel, guide wheel and other structures, and the preparation work before polishing takes a long time.

[0008] Chinese patent CN108555733A discloses a device for fine grinding the inner surface of medical syringe needles. The patent uses a bundle of abrasive wires bundled together with multiple diamond wires as a polishing rope. Through the centrifugal effect generated by rotation, the abrasive wire bundle is scattered into several parallel abrasive wires in the inner hole for polishing. Specifically for polishing the inner surface of medical syringe needles, it is necessary to pass a number of diamond wires through the workpiece and then bundle the two ends of the abrasive wires, and the preparation work takes a long time; for polishing of variable diameter inner holes, the polishing effect of the large diameter part is poor due to the influence of the small diameter, or even cannot be polished.

[0009] The above patents and other slender tube inner surface polishing devices are mostly aimed at inner holes of uniform diameter or larger apertures, and cannot meet the polishing requirements of small-diameter and variable-diameter slender holes. Therefore, it is urgent to provide a polishing device and method for small-diameter and variable-diameter slender holes to ensure polishing efficiency and polishing accuracy. Summary of the invention

[0010] In order to solve the above problems existing in the prior art, the present invention designs a device and method for polishing the inner hole of a slender straight tube, so as to achieve uniform polishing with controllable polishing intensity on the inner surface of the slender variable diameter straight tube and improve the surface quality of the inner hole.

[0011] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a slender straight tube inner hole polishing device includes a workbench, a wire rope polishing unit, a flushing and air-drying unit and an abrasive polishing unit.

[0012] The wire rope polishing unit includes a motor, a wire rope clamp, an abrasive paste hopper, a transmission device, a workpiece clamp, an abrasive paste recovery device and a protective device. The motor is fixedly installed on the left side of the workbench, the output shaft of the motor is connected to the wire rope clamp, the wire rope clamp is fixedly connected to the left end of the wire rope, the right end of the wire rope extends into the inner hole of the workpiece or passes through the inner hole of the workpiece and extends out of the right end of the workpiece; the abrasive paste hopper is fixedly installed above the wire rope through a hopper bracket; the workpiece is installed on the workbench through a transmission device and a workpiece clamp, the transmission device is installed on the workbench and is in contact with the protective device; the protective device is nested at the entrance of the left end of the workpiece; the abrasive paste recovery device is installed on the right side of the workbench and is located below the right end of the workpiece.

[0013] Furthermore, the rinsing and drying unit includes a water pump, an air pump and a three-way joint, the water pump and the air pump are both installed on the workbench, the outlets of the water pump and the air pump are connected to the left end of the workpiece through the three-way joint, and a recovery box is installed on the workbench below the right end of the workpiece; the workpiece is mounted on the workbench through a workpiece clamp.

[0014] Furthermore, the abrasive polishing unit includes a polishing liquid pump, a polishing liquid tank and a connecting bracket, the inlet of the polishing liquid pump is connected to the outlet of the polishing liquid tank through a water pipe, the outlet is connected to one end of the workpiece through the water pipe, the other end of the workpiece is connected to the inlet of the polishing liquid tank through the water pipe, and the workpiece is mounted on the workbench through the connecting bracket.

[0015] Furthermore, the steel wire rope includes 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, 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 the diameter of the thick steel wire rope and larger than the diameter of the thin steel wire rope.

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

[0017] Furthermore, the workpiece fixture includes 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] Furthermore, the transmission device includes a spring, an L-shaped transmission frame, a thrust bearing, a rubber disc, an eccentric transmission wheel and a transmission motor. The central circular hole of the rubber disc is interference-fitted with the outer cylindrical surface of the plastic tube of the protective device. The two side surfaces of the rubber disc are respectively fixedly connected to the thrust bearing. The thrust bearing is slidably connected to the guide rail, and the guide rail is fixed to the workbench through a connecting piece. The outer cylindrical surface of the rubber disc contacts the upper surface of the eccentric transmission wheel, the eccentric transmission wheel is connected to the transmission motor, and the transmission motor is fixed to the workbench; the left side surface of the eccentric transmission wheel contacts 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 to the thrust bearing, the left side surface of the vertical plate of the L-shaped transmission frame is fixedly connected to one end of the spring, and the other end of the spring is fixed to the workbench.

[0019] When the eccentric transmission wheel rotates, the upper surface of the eccentric transmission wheel drives the rubber disk to rotate through friction, thereby driving the workpiece to rotate; at the same time, when the eccentric transmission wheel rotates, it pushes the L-shaped transmission frame to reciprocate along the axial direction of the workpiece, thereby driving the workpiece to reciprocate along the axial direction of the workpiece through the thrust bearing and the rubber disk.

[0020] Furthermore, the protection device comprises a metal tube and a plastic tube, the left section inside the plastic tube is nested on the metal tube, and the right section inside the plastic tube is nested on the workpiece; the inner and outer diameters of the metal tube and the workpiece are the same.

[0021] A method for polishing the inner hole of a slender straight tube, using the slender straight tube inner hole polishing device for polishing, comprises the following steps:

[0022] Step 1: Select the appropriate grinding paste according to the workpiece material, and select the thick wire rope, medium wire rope and thin wire rope of appropriate diameter according to the inner diameter and length of the workpiece.

[0023] Step 2: Fix the workpiece through the transmission device and the workpiece fixture, and add an appropriate amount of abrasive paste into the abrasive paste hopper.

[0024] Step 3. After applying a proper amount of abrasive paste on the wire rope, clamp the wire rope with a wire rope clamp, pass it through the protective device and extend it into the inner hole; if it is a thin wire rope, extend the right end of the wire rope out of the right end of the workpiece; otherwise, extend the right end of the wire rope to the diameter change point of the inner hole of the workpiece.

[0025] Step 4: Observe the rotation direction of the wire rope, ensure that the motor rotates in the opposite direction to the wire rope, control the motor speed while allowing the grinding paste to continuously enter the hole under the spiral action of the wire rope until it flows out from the workpiece outlet and is collected by the grinding paste recovery device. At the same time, the transmission device controls the workpiece to rotate in the opposite direction to the wire rope and shake it back and forth along the axis.

[0026] Step 5: Keep the workpiece moving. After the abrasive paste flows out from the workpiece outlet, keep the motor at a high speed for polishing.

[0027] Step 6: If all three diameters of wire rope have been used once, go to step 7; otherwise, replace the wire rope with another diameter and go to step 2.

[0028] Step 7: Stop the motor, remove the workpiece and rinse it until there is no grinding paste left in the inner hole.

[0029] Step 8: Prepare the polishing liquid and pour it into the polishing liquid tank of the abrasive polishing unit. Install the workpiece into the abrasive polishing unit, check the air tightness, and place the workpiece into the abrasive polishing unit for polishing.

[0030] Step 9: Install the workpiece into the rinse and air-dry unit for rinsing and air-drying.

[0031] Step 10: Inspect the inner hole of the air-dried workpiece. If the inner surface quality reaches the expected target, the polishing process is completed.

[0032] Furthermore, in step five, the grinding paste in the grinding paste recovery device is put back into the grinding paste hopper.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. Since the steel wire rope has a certain rigidity, the swing generated during rotation can polish the inner hole. The spiral structure of the steel wire rope facilitates the transportation of the abrasive paste into the inner hole, and no special polishing rope or feeding device is required to supply the abrasive paste for polishing.

[0035] 2. The present invention only requires the steel wire rope and the workpiece to be installed and clamped for processing. The consumables used are convenient and easy to obtain, and the grinding paste can be reused to save energy and be environmentally friendly; the overall structure is simple and the operation is convenient.

[0036] 3. The whole steel wire rope of the present invention is highly efficient in polishing various parts of the inner hole of the workpiece. For workpieces with variable diameters, the small diameter position is first polished with a thin steel wire rope, and at this time the large diameter position also has a certain polishing effect. Then the large diameter position is polished with a thick steel wire rope, while the small diameter position is not affected.

[0037] 4. In addition to polishing the steel wire rope, the present invention also prepares a polishing liquid for polishing to further improve the polishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0040] Figure 3 It is a schematic diagram of the structure of the washing and air-drying unit of the present invention.

[0041] Figure 4 It is a schematic diagram of the structure of the abrasive polishing unit of the present invention.

[0042] Figure 5 This is a schematic diagram of the structure of a variable diameter workpiece processed by the present invention.

[0043] Figure 6 It is a schematic diagram of the transmission device of the present invention.

[0044] Figure 7 It is a schematic diagram of a workpiece fixture of the present invention.

[0045] Figure 8 for Figure 7 Top view of the .

[0046] Fig. 9 It is a schematic diagram of the protection device of the present invention.

[0047] In the figure: 1. motor; 2. wire rope clamp; 3. abrasive paste hopper; 4. transmission device; 5. workpiece clamp; 6. workbench; 7. protection device; 8. workpiece; 9. wire rope; 10. abrasive paste recovery device; 11. air pump; 12. water pump; 13. recovery box; 14. polishing liquid pump; 15. polishing liquid box; 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 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.

[0049] like Figure 1-9 As shown, a slender straight tube inner hole polishing device includes a workbench 6, a wire rope 9 polishing unit, a flushing and air-drying unit and an abrasive polishing unit.

[0050] The wire rope polishing unit includes a motor 1, a wire rope clamp 2, an abrasive paste hopper 3, a transmission device 4, a workpiece clamp 5, an abrasive paste recovery device 10 and a protective device 7. The motor 1 is fixedly mounted on the left side of the workbench 6, and 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, and the right end of the wire rope 9 extends into the inner hole of the workpiece 8 or passes through the inner hole of the workpiece 8 and extends out of the right end of the workpiece 8; the abrasive paste hopper 3 is fixedly mounted above the wire rope 9 through a hopper bracket; the workpiece 8 is mounted on the workbench 6 through the transmission device 4 and the workpiece clamp 5, and the transmission device 4 is mounted on the workbench 6 and is in contact with the protective device 7; the protective device 7 is nested at the entrance of the left end of the workpiece 8; the abrasive paste recovery device 10 is mounted on the right side of the workbench 6 and is located below the right end of the workpiece 8.

[0051] Furthermore, the rinsing and drying unit includes a water pump 12, an air pump 11 and a three-way joint, and the water pump 12 and the air pump 11 are both installed on the workbench 6, and 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 joint, and 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] Furthermore, 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, 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, and the workpiece 8 is installed on the workbench 6 through the connecting bracket 16.

[0053] Furthermore, the steel wire rope includes 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, and the diameter of the medium steel wire rope is smaller than the diameter of the thick steel wire rope and larger than the diameter of the thin steel wire rope.

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

[0055] Furthermore, the workpiece fixture 5 includes 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 8; the cylindrical seat is installed on the workbench 6 through a rotating shaft, and the two vertical rods are brought into contact with the workpiece 8 by rotating the cylindrical seat.

[0056] Furthermore, 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 circular hole of the rubber disc 404 is interference fit with the outer cylindrical surface of the plastic tube 702 of the protective device 7. The two side surfaces of the rubber disc 404 are respectively fixedly connected to the thrust bearing 403. The thrust bearing 403 is slidably connected to the guide rail 405 through a connecting piece 406. The guide rail 405 is fixed on the workbench 6. The outer cylindrical surface of the rubber disk 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 workbench 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 workbench 6.

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

[0058] Furthermore, the protection device 7 includes a metal tube 701 and a plastic tube 702 , the left section inside the plastic tube 702 is nested on the metal tube 701 , and the right section inside the plastic tube 702 is nested on the workpiece 8 ; the metal tube 701 and the workpiece 8 have the same inner and outer diameters.

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

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

[0061] During abrasive polishing, firstly, polishing liquid prepared in a certain proportion is added to the polishing liquid tank 15 , and then the polishing liquid is drawn through the polishing liquid pump 14 and pumped into the workpiece 8 to polish the workpiece 8 .

[0062] During flushing, firstly, the residual polishing paste in the inner hole of the workpiece 8 is blown out by the air pump 11 and collected in the recovery box 13; then, the workpiece is flushed with clean water by the water pump 12, and a certain amount of detergent can also be added to improve the decontamination ability.

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

[0064] The embodiment of the present invention is as follows: A method for polishing the inner hole of a slender straight tube, using the slender straight tube inner hole polishing device for polishing, comprises the following steps:

[0065] Step 1: 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 2: Fix the workpiece 8 with the workpiece fixture 5 and add a proper amount of abrasive paste into the abrasive paste hopper 3.

[0067] Step 3: Take a 0.6mm steel wire rope 9 and apply polishing paste on it, then pass it through the protective device 7 and extend it into the inner hole of the workpiece 8 from the thick opening, leaving 2-3mm exposed from the thin end, and clamp it with the steel wire rope clamp 2.

[0068] Step 4: Observe the rotation direction of the wire rope 9, ensure that the rotation direction of the motor 1 is opposite to that of the wire rope 9, and control the rotation speed while allowing the grinding paste to continuously enter the hole under the spiral action of the wire rope 9 until it flows out from the outlet of the workpiece 8 and is collected by the grinding paste recovery device 10. At the same time, ensure that the workpiece 8 rotates in the opposite direction to the wire rope 9 and shakes back and forth along the axis direction.

[0069] Step 5: Keep the workpiece 8 moving. After the abrasive paste flows out from the outlet of the workpiece 8, keep the motor 1 at a high speed for polishing for 30 minutes. The abrasive paste in the abrasive paste recovery device 10 can be added back into the abrasive paste hopper 3.

[0070] Step 6: Take a 1.2 mm steel wire rope 9 and repeat steps 2, 3, 4 and 5 for polishing for 10 minutes.

[0071] Step 7: Take a 0.8 mm steel wire rope 9 and repeat steps 2, 3, 4 and 5 for polishing for 20 minutes.

[0072] Step 8: After the processing is completed, the motor 1 stops, and the workpiece 8 is removed and rinsed until there is no grinding paste remaining in the inner hole.

[0073] Step 9: Prepare the polishing liquid and pour it into the polishing liquid tank 15 of the abrasive polishing unit, install the workpiece 8 into the abrasive polishing unit, and check the air tightness.

[0074] Step 10: Turn on the polishing liquid pump 14 to perform polishing.

[0075] Step 11: After polishing is completed, the workpiece 8 is rinsed and air-dried.

[0076] Step 12: inspect the processed workpiece 8, and if the inner surface quality reaches the expected target, the polishing process is completed.

[0077] The present invention uses specific examples to illustrate the principles and implementation methods of the present application. The above examples are only used to help understand the method and its core idea of ​​the present application. The above is only the preferred implementation method of the present application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the application to other occasions without improvement, should be regarded as the protection scope of the present application.

Claims

1. A polishing device for inner hole of a slender straight tube, characterized in that: It comprises a workbench (6), a wire rope polishing unit, a flushing and air-drying unit and an abrasive polishing unit; The wire rope polishing unit comprises a motor (1), a wire rope clamp (2), an abrasive paste hopper (3), a transmission device (4), a workpiece clamp (5), an abrasive paste recovery device (10) and a protection device (7). The motor (1) is fixedly mounted on the left side of a 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 passes through the inner hole of the workpiece (8) and extends out. Outside the right end of the workpiece (8); the abrasive paste hopper (3) is fixedly mounted above the wire rope (9) through a hopper bracket; the workpiece (8) is mounted on the workbench (6) through a transmission device (4) and a workpiece fixture (5), and the transmission device (4) is mounted on the workbench (6) and is in contact with the protection device (7); the protection device (7) is nested at the left end entrance of the workpiece (8); the abrasive paste recovery device (10) is mounted on the right side of the workbench (6) and is located below the right end of the workpiece (8).

2. A polishing device for inner hole of a slender straight tube according to claim 1, characterized in that: 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 a workbench (6); the outlets of the water pump (12) and the air pump (11) are both connected to 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 a workpiece fixture (5).

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

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

5. The device for polishing inner holes 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 device for polishing inner holes of a slender straight tube according to claim 1, characterized in that: The workpiece fixture (5) comprises a cylindrical seat and two vertical rods, wherein 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 (8); the cylindrical seat is installed on the workbench (6) via a rotating shaft, and the two vertical rods are brought into contact with the workpiece (8) by rotating the cylindrical seat.

7. The device for polishing inner holes of a slender straight tube according to claim 1, characterized in that: 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 central circular hole of the rubber disc (404) is interference-fitted with the outer cylindrical surface of the plastic tube (702) of the protection device (7); the two side surfaces of the rubber disc (404) are respectively fixedly connected to the thrust bearing (403); the thrust bearing (403) is slidably connected to the guide rail (405) through a connecting piece (406); and the guide rail (405) is fixed on the workbench (6); the rubber disc The outer cylindrical 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 workbench (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 workbench (6); When the eccentric transmission wheel (408) rotates, the upper surface of the eccentric transmission wheel (408) drives the rubber disk (404) to rotate through friction, thereby driving the workpiece (8) to rotate; at the same time, when the eccentric transmission wheel (408) rotates, it pushes the L-shaped transmission frame (402) to reciprocate along the axial direction of the workpiece (8), thereby driving the workpiece (8) to reciprocate along the axial direction of the workpiece (8) through the thrust bearing (403) and the rubber disk (404).

8. The device for polishing inner holes of a slender straight tube according to claim 1, characterized in that: The protective device (7) comprises 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.

9. A method for polishing the inner hole of a slender straight tube, characterized in that: Polishing is performed using any of the slender straight tube inner hole polishing devices described in claims 1-8, comprising the following steps: Step 1: Select a suitable grinding paste according to the material of the workpiece (8), and select a thick steel wire rope (9), a medium steel wire rope (9) and a thin steel wire rope (9) of suitable diameter according to the inner diameter of the workpiece (8) and the length of the workpiece (8); Step 2: Fix the workpiece (8) through the transmission device (4) and the workpiece fixture (5), and add a proper amount of abrasive paste into the abrasive paste hopper (3); Step 3: After applying an appropriate amount of abrasive paste on the steel wire rope (9), clamp the steel wire rope (9) with the steel wire rope clamp (2), pass the steel wire rope through the protective device (7) and extend it into the inner hole; if it is a thin steel wire rope (9), extend the right end of the steel wire rope (9) out of the right end of the workpiece (8); otherwise, extend the right end of the steel wire rope (9) to the diameter change point of the inner hole of the workpiece (8); Step 4: Observe the rotation direction of the steel wire rope (9), ensure that the rotation direction of the motor (1) is opposite to that of the steel wire rope (9), control the rotation speed of the motor (1) and allow the grinding paste to continuously enter the hole under the spiral action of the steel wire rope (9) until it flows out from the outlet of the workpiece (8) and is collected by the grinding paste recovery device (10); at the same time, control the workpiece (8) and the steel wire rope (9) to rotate in the opposite direction through the transmission device (4), and shake back and forth along the axial direction; Step 5, keep the workpiece (8) moving, and after the abrasive paste flows out from the outlet end of the workpiece (8), keep the motor (1) at a high speed for polishing; Step 6: If the steel wire ropes (9) of three diameters have all been used once, go to step 7; otherwise, replace the steel wire rope (9) with another diameter and go to step 2; Step 7: The motor (1) stops, and the workpiece (8) is removed and rinsed until no abrasive paste remains in the inner hole; Step 8: Prepare the polishing liquid and pour it into the polishing liquid tank (15) of the abrasive polishing unit, install the workpiece (8) into the abrasive polishing unit, check the air tightness, and put the workpiece (8) into the abrasive polishing unit for polishing; Step 9, installing the workpiece (8) into the washing and air-drying unit for washing and air-drying; Step 10: Inspect the inner hole of the air-dried workpiece (8), and if the inner surface quality reaches the expected target, the polishing process is completed.

10. A method for polishing the inner hole of a slender straight tube according to claim 10, characterized in that: In the step 5, the grinding paste in the grinding paste recovery device (10) is put back into the grinding paste hopper (3).

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