Repair device for repairing the inner surface of a hollow cylindrical object

Abstract

A repair device for repairing an inner surface of a hollow cylindrical object comprises a drive unit having a movement mechanism for moving the entire drive unit in an axial direction in the pipe, an abrasive unit comprising an abrasive tool for cleaning the inner surface, a positioning device for adjusting the position of the abrasive tool so that the abrasive tool abuts against the inner surface, and a coating unit for applying a coating to the inner surface cleaned by the abrasive tool. The drive unit comprises a rotary drive. The abrasive unit is supported and carried by the drive unit for operation and is at least partially operable by the rotary drive. The coating unit is supported and carried by the drive unit for operation. The abrasive unit and the coating unit are selectively engageable with the drive unit for operation.

Description

Technical Field

[0001] This utility model relates to a repair device for repairing the inner surface of a hollow cylindrical object, for example, particularly but not necessarily, a pipe through which liquids (e.g., water or oil) or gases (e.g., natural gas) flow. Background Technology

[0002] Pipelines used to transport liquids or gases are typically used for a long time (usually decades), but even without damage, they will inevitably deteriorate or require maintenance, repair, or maintenance. Replacing the defective pipe section is obviously a solution, but it is usually not the first choice. In many cases, repair is insufficient to solve the problem; for example, maintenance or overhaul of the piping system is necessary to extend or maximize its service life.

[0003] The present invention aims to repair the inner surface of hollow cylindrical objects by providing a new or improved repair device to reduce or at least alleviate such defects. Utility Model Content

[0004] According to this utility model, a repair device for repairing the inner surface of a hollow cylindrical object is provided. The device includes a drive unit with a moving mechanism for axially moving the entire drive unit within the hollow cylindrical object; a grinding unit including a grinding tool for cleaning the inner surface; a positioning device for adjusting the position of the grinding tool so that it abuts against the inner surface; and a coating unit for applying a coating to the inner surface cleaned by the grinding tool. The drive unit includes a rotary actuator. The grinding unit is supported and carried by the drive unit for operation and is at least partially operated by the rotary actuator. The coating unit is supported and carried by the drive unit for operation. The grinding unit and the coating unit can selectively engage with the drive unit for operation.

[0005] Preferably, the positioning device is driven to engage with the rotary driver for operation and is adapted to bring the abrasive tool into contact with the inner surface to perform brushing and cleaning of the inner surface with sufficient force.

[0006] Preferably, the moving mechanism includes a plurality of rotating members located on opposite sides of the driving unit for supporting the entire driving unit relative to the inner surface and moving the entire driving unit along the inner surface.

[0007] More preferably, the rotating member includes a wheel for directly engaging the inner surface.

[0008] Preferably, the drive unit includes an expandable bracket located on the side of the drive unit opposite to the rotating member, for abutting against the inner surface to hold the entire drive unit in a stable position relative to the inner surface.

[0009] More preferably, the drive unit includes a body having an upper portion that is movable upward and provides the expandable support.

[0010] In a preferred embodiment, the grinding unit is arranged to rotate via the rotary driver, thereby sequentially moving the grinding tool along the inner surface in a circular path about the axial direction.

[0011] More preferably, the grinding unit includes a positioning device for adjusting the position of the grinding tool so that the grinding tool abuts against the inner surface.

[0012] More preferably, the positioning device is adapted to adjust the position of the grinding tool in the radial direction about the axial direction.

[0013] More preferably, the positioning device includes a slider adapted to hold the grinding tool and slide the grinding tool in a radial direction.

[0014] Even more preferably, the positioning device includes at least one motor arranged to operate the slider.

[0015] Preferably, the grinding unit includes a rotary tool for operating the grinding tool, the rotary tool having a body with a built-in motor and an output connector for connecting the grinding tool.

[0016] Preferably, the grinding tool includes a rotating brush, and the grinding unit includes a built-in motor for operating the rotating brush.

[0017] Preferably, the grinding unit is supported and carried by the driving unit, and the positioning device is driven to engage with the rotary driver for operation.

[0018] In a preferred embodiment, the rotary driver includes a motor and a drive transmission system, the drive transmission system being arranged to transmit the output drive of the motor to the positioning device in a deceleration manner.

[0019] More preferably, the drive transmission system includes at least a first gear and a second gear, which are driven to engage with the motor and the positioning device, respectively, wherein the second gear is much larger than the first gear.

[0020] More preferably, the second gear has a relatively large hole that is exposed through an opening in the body of the drive unit.

[0021] In a preferred embodiment, in addition to the positioning device, the grinding unit can be detached from the driving unit to allow the coating unit to engage with the driving unit for operation.

[0022] More preferably, the positioning device has a hole through which the coating unit can be inserted to engage with the drive unit for operation.

[0023] Preferably, in addition to the positioning device, the grinding unit can be disengaged from the driving unit to allow the coating unit to engage with the driving unit for operation. The positioning device has a hole aligned with the hole of the second gear, and the coating unit can be inserted into both holes to engage with the driving unit for operation.

[0024] In a preferred embodiment, the coating unit includes a sprayer adapted to dispense and apply coating material in a spray form onto the inner surface.

[0025] More preferably, the sprayer is adapted to dispense coating material in a 360° manner around the central axis.

[0026] More preferably, the sprayer includes annular orifices arranged in a 360° pattern around a central axis for dispensing coating material.

[0027] More preferably, the sprayer can be rotated to dispense coating material by centrifugal force.

[0028] Preferably, the coating unit includes a built-in motor for operating the sprayer.

[0029] Preferably, the sprayer has an opening rear side through which the coating material is supplied into the body of the sprayer.

[0030] Preferably, the coating unit includes a reservoir for containing coating material, the reservoir being supported and carried by the drive unit.

[0031] Preferably, the coating unit includes a body that supports the sprayer and houses the motor, the body being insertable into the drive unit for support and load-bearing by it.

[0032] Preferably, the coating unit includes a rotating tool for operating the sprayer, the rotating tool having a body with a built-in motor and an output connector for connecting to the sprayer.

[0033] More preferably, the drive unit includes an internal support for positioning the coating unit via the body when the body is inserted into the drive unit. Attached Figure Description

[0034] The present invention will now be described in more detail by way of example only with reference to the accompanying drawings, in which:

[0035] Figure 1 This is a side view of an embodiment of the repair device according to the present invention, which is used in a pipe to repair the inner surface of the pipe. The repair device is in a grinding configuration for brushing to clean the inner surface.

[0036] Figure 2 yes Figure 1 Front view of the repair device;

[0037] Figure 3 yes Figure 1 A side view of a repair device in a pipe, which is then in a coating configuration for applying a coating to a clean inner surface;

[0038] Figure 4 yes Figure 1 A front view of the repair device in the pipeline;

[0039] Figure 5 yes Figure 1 The repair device is located in the front perspective view of the grinding configuration;

[0040] Figure 6 yes Figure 5 Side view of the repair device;

[0041] Figure 7 yes Figure 6 A cross-sectional side view of the repair device;

[0042] Figure 8 yes Figure 3 A front-end perspective view of the repair device in the coating configuration;

[0043] Figure 9 yes Figure 8 Another perspective view of the repair device, showing some parts from the front;

[0044] Figure 10 yes Figure 8 Side view of the repair device;

[0045] Figure 11 yes Figure 10 A cross-sectional side view of the repair device;

[0046] Figure 12 yes Figure 11A perspective cross-sectional view of the front end of the repair device;

[0047] Figure 13 yes Figure 9 Side view of those parts of the repair device. Detailed Implementation

[0048] See the attached diagram. Figures 1 to 13 This illustration shows a repair device for repairing the inner surface of a hollow cylindrical object. The hollow cylindrical object is, for example, a pipe 10, particularly a pipe segment 10S for conveying fluids such as gas or water. The pipe segment 10S has a linear central axis X extending along its length and an inner surface 11 extending cylindrically around the central axis X, both extending together along a horizontal axis Y. The pipe 10 is installed for conveying water, steam, gas, or oil, and can be made of metal, concrete, or any other suitable material. The pipe 10 can be buried underground or operate underwater or in an open environment, whether indoors or outdoors. In the described embodiment, the pipe 10 is a cast iron gas pipe installed underground.

[0049] The repair device 100 is designed to repair pipe 10, and particularly the inner pipe surface 11 of pipe segment 10S. Pipe segment 10S can be accessed through one end of pipe 10 (e.g., the right end), which is exposed for this purpose, and where a user (e.g., a technician) is located with the necessary support equipment to operate and control the repair device 100. In this example, pipe segment 10S has a section, such as joint 10J, that requires repair or refurbishment to provide protection by applying a coating to the inner surface 11.

[0050] The repair device 100 has three basic units: a drive unit 200, a grinding unit 300, and a coating unit 400. The drive unit 200 has a moving mechanism 220 for moving the entire drive unit 200 axially along the pipe segment 10S in the Y direction, and includes an internal rotary actuator 250. The grinding unit 300 has a grinding tool 310 for cleaning the inner surface 11 of the pipe. The grinding unit 300 is designed to be supported and carried by the drive unit 200 for operation, and is at least partially operated by the rotary actuator 250. The coating unit 400 can apply a coating to the inner surface 11 of the pipe after it has been cleaned by the grinding tool 310. Like the grinding unit 300, the coating unit 400 is also designed to be supported and carried by the drive unit 200 for operation, but at a different time. Specifically, the coating unit 400 can be interchanged with the grinding unit 300 for corresponding operations.

[0051] The drive unit 200 has a car-like configuration, comprising a main body 210 with four wheels 224, two on each of its left and right sides, for direct engagement with the inner surface 11 of the pipe. The wheels 224 are rotating members arranged on opposite sides of the main body 210 of the drive unit, used to support the entire drive unit 200 within the pipe segment 10S relative to the inner surface 11 of the pipe, and for moving the entire drive unit 200 along the inner surface 11. The two wheels 224 on each side are each driven by a separate motor 224M, and the components on that side are all mounted on a common elongated chassis member on that side. The four wheels 224 with their respective motors 224M together constitute the movement mechanism 220.

[0052] The body 210 is hollow, with its upper portion serving as a cover 211 for closing the body 210. The body 210 houses certain components of the drive unit 200, including a motor, preferably a motor 250M, which acts as a rotary actuator 250 and extends horizontally back-and-forth at a central position at the bottom of the body 210. The motor 250M has a forward-extending drive shaft 250S. The body 210 also houses a lifting mechanism for vertically and upwardly moving the cover 211 in a guided manner. The lifting mechanism can be any suitable design commonly known in the art, such as an arrangement of a motor-driven metering screw system to slide the cover 211 up and down via its vertical legs.

[0053] The cover 211 also functions as an expandable support, positioned on one side, i.e., the upper side, of the drive unit's main body 210, opposite the lower wheel 224. The expanded cover 211, in conjunction with the wheel 224, supports the inner surface 11 of the pipe, thereby maintaining the entire drive unit 200 in a stable position relative to the inner surface 11 within the pipe segment 10S. The wheel 224 and cover 211 may be made of plastic material for a more secure grip on the inner surface 11.

[0054] The external dimensions of the drive unit 200 are designed such that when the drive unit 200 is in the stable position, its central axis generally coincides with the central axis X of the pipe section 11S. For simplicity, the central axis of the drive unit 200 may be referred to as the central axis X below.

[0055] The drive unit 200 has a front end at which a cylindrical collar structure 230 is fixed to the front sidewall of the main body 210. The collar structure 230 is formed by a main collar 231 having a central hole 231A, and includes an outer collar 232 surrounding the free end 231E of the main collar 231. The front sidewall has a relatively large circular hole on which the main collar 231 of the collar structure is coaxially connected, thereby connecting the collar structure 230 to the interior of the main body 210. The collar structure 230 can be considered as an extension of the main body 210, and its central hole 231A serves as an opening of the main body 210.

[0056] In addition to the motor 250M, the rotary drive 250 also includes a drive transmission system arranged to transmit the drive output of the motor 250M in a reduced-speed manner to the positioning device 370 of the grinding unit 300 (described below). The drive transmission system includes at least a first gear 251 and a second gear 252, which are driven into engagement with the drive shaft 250S of the motor and the positioning device 370, respectively. The first gear 251 and the second gear 252 are provided by corresponding gear disks 251 and 252. The second gear disk 252 is much larger than the first gear disk 251 and has a relatively large circular aperture 252A, which is exposed through the aforementioned opening in the body 210 of the drive unit 200 provided by the collar structure 230.

[0057] The grinding unit 300 has a grinding tool 310 provided by a motor-driven rotary brush 310B, which is preferably made of pancake-shaped steel wire. The grinding unit 300 includes a rectangular handle-shaped body 320, a motor, preferably pneumatic (i.e., gas-operated), 330 housed within the body 320, a 90-degree gearbox 340 located at one end of the body 320 for redirecting the rotational drive of the motor 330 by 90°, and a claw chuck 350 (i.e., output connector) connected to the output of the gearbox 340 for clamping and rotating the rotary brush 310B via its central axis. Thus, the rotary brush 310B is driven by the motor 330. These components, numbered 310 to 350, in the grinding unit 300 are directly related to the main function, namely, the grinding or scrubbing action for cleaning the inner surface 11 of the pipe. These components 310 to 350 are collectively referred to as grinding assemblies 310-350.

[0058] The grinding unit 300 includes an L-shaped bracket 360 with a back surface, and the grinding assemblies 310-350 are mounted on the L-shaped bracket 360 by a pair of fastening clips 362 on the body 320. The body 320 is mounted to extend radially relative to the axial direction Y, with the rotating brush 310B located at the outermost radial position (i.e., in...). Figure 7 (Located at the bottom in the resting position). On its opposite front side, the bracket 360 has a flange 361, which is the horizontal lower flange in the resting position.

[0059] The grinding unit 300 includes a positioning device 370 for fixing the grinding assemblies 310-350, particularly for adjusting the position of the rotating brush 310B so that the rotating brush 310B abuts against the inner surface 11 of the pipe. Specifically, the positioning device 370 is adapted to adjust the position of the rotating brush 310B in the radial direction about the axial direction Y, extending at a right angle thereto.

[0060] As for the construction, the positioning device 370 has a generally flat body 371 with a relatively large circular central hole 371A, and includes a slider assembly adapted to hold and slide the grinding assemblies 310-350, particularly the rotating brush 310B, in the radial direction. The slider assembly is provided by a pair of sliders 372 arranged on opposite sides (left and right) of the body 371 and the central hole 371A.

[0061] Each slider 372 is a linear structure, having a shaft 372S at one end and a motor, preferably an electric motor 372M, at the other end. The shaft 372S and the motor 372M are arranged to extend along a common central axis of the sliders 372. While the motor 372M is generally exposed, the proximal end of the shaft 372S is located within the body 371 and is driven into engagement with the motor 372M, and includes an exposed distal end 372SE. Between the motor 372M and the proximal end of the shaft 372S, there is a gear engagement that converts the rotational drive of the motor 372M into linear motion of the shaft 372S, which includes the opposite direction and relatively low speed. It is understood that the gear engagement provides a metering helical action to the shaft 372S. This causes the shaft 372S, and particularly its exposed end 372SE, to be driven to slowly extend and retract relative to the body 371.

[0062] The positioning device 370 is located at the front end of the drive unit 200, and its main body 371 is secured by, for example, screws 371S (see...). Figure 7 The positioning device 370 is coaxially connected to the second gear disk 252 (of the rotary driver 250) in the collar structure 230. With this arrangement, the positioning device 370 can be rotated by and together with the second gear disk 252, making the positioning device 370 rotatable and therefore operable by the rotary driver 250. As described above, the rotating brush 310B is operated by the built-in motor 330. Therefore, generally speaking, the grinding unit 300 can be partially operated by the rotary driver 250.

[0063] As described above, the grinding assemblies 310-350 are held or supported by the positioning device 370. This is achieved by a bracket 360 (on which the grinding assemblies 310-350 are mounted), whose flange 361 is secured by screws 361S (see...). Figure 7 The lower ends 372SE of the two sliders 372 connected to the positioning device 370.

[0064] In this configuration, which can be called the grinding configuration ( Figure 5The grinding unit 300, supported and carried by the drive unit 200, performs the grinding operation, i.e., brushing to clean the inner surface 11 of the pipe. The positioning device 370 abuts the rotating brush 310B against the inner surface 11. The user can control the drive unit 200 to move forward and backward along the axial Y at a relatively slow speed to thoroughly clean the inner surface 11 along a sufficient length of the pipe segment 10S until that portion of the inner surface 11 is completely clean.

[0065] By unscrewing the screws, the grinding components 310-350 and the bracket 360 can be detached or removed from the positioning device 370, which remains fixed to the drive unit 200. It should be noted that, apart from the positioning device 370, the grinding unit 300 can be detached from the drive unit 200 after completing the grinding and cleaning operation on the inner surface 11 of the pipe.

[0066] During the grinding and cleaning operation, the grinding unit 300 rotates its grinding components 310-350 by the rotary driver 250, which in turn moves the rotating brush 310B, rotated by the built-in motor 330, on the inner surface 11 of the pipe and along the inner surface 11 in a circular path about the central axis X. The positioning device 370 engages with the motor 250M of the rotary driver 250 in the drive unit 200 to operate, thereby bringing the rotating brush 310B into contact with the inner surface 11 and applying sufficient force to scrub and thoroughly clean the inner surface 11.

[0067] Generally, the grinding unit 300 (except for its positioning device 370) can be detached from the drive unit 200 to allow the coating unit 400 to engage with the drive unit 200 for subsequent coating operations on the inner surface 11 of the pipe after it has been cleaned by the grinding unit 300. The positioning device 370 is designed with a central hole 371A through which the coating unit 400 can be inserted to engage with the drive unit 200 for operation. In this respect, the central hole 371A is aligned with the hole 252A of the second gear disk 252, and the coating unit 400 can be inserted through both holes 371A and 252A to engage with the drive unit 200 for operation.

[0068] The coating unit 400 has a rectangular handle-shaped body 410, a sprayer 420 supported by the body 410 and located at the front end of the body 410, and a motor (preferably a pneumatic motor 430) housed in the body 410 for operating the sprayer 410 to dispense and apply coating material to the inner surface 11 of the pipe in the form of a spray. The body 410 is fitted with a chuck 440 (i.e., an output connector) at its front end, and the chuck 440 is rotatably engaged with the built-in motor 430.

[0069] The sprayer 420 has a cylindrical canister-shaped body 421 with cylindrical sidewalls 421W having a central axis and forming small holes 421H (nozzles) arranged annularly around the central axis in a 360° pattern for dispensing coating material from inside the body 421. The body 421 includes a central shaft 422 that extends coaxially from inside the body 421 through an opening rear side 421R. The shaft 422 is inserted into and connected to a chuck 440 for rotation by a motor 430, thereby dispensing the coating material by centrifugal force around the central axis in a 360° pattern.

[0070] The coating material can be contained in a container in the form of a cylinder 450, which is mounted on the left side of the drive unit 200 for support and load-bearing. The coating material is supplied from the rear through its open rear side 421R via a small tube 460 extending forward from the cylinder 450 into the sprayer body 421.

[0071] Inside the main body 210 of the drive unit 200, there is a bracket 212 with a cylindrical hole 212A. The horizontal central axis of this hole is aligned with the central axis of the hole 371A of the positioning device 370 and the hole 252A of the second gear disk 252. These three holes 212A, 371A and 252A are connected and, by aligning them, form a groove that extends horizontally to the front end of the drive unit 200.

[0072] For operation, the coating unit 400, together with its body 410, is inserted into this groove and positioned stably by fitting the body 410 through a hole 212A passing through a diameter-matching bracket 212. This can be referred to as a coating configuration ( Figure 8 In this configuration, the coating unit 400 is supported and carried by the drive unit 200 for applying a coating to the inner surface 11 of the cleaned pipe. The user can control the drive unit 200 to move forward and backward along the axial direction Y at a relatively slow speed to apply a coating of sufficient thickness to the inner surface 11 over a sufficient length along the pipe segment 10S until that portion of the inner surface 11 is fully protected.

[0073] In this particular embodiment of the repair device 100, the abrasive components 310-350, excluding the rotary tool 310 (brush 310B), are preferably provided by a handheld electric rotary tool. Furthermore, the coating unit 400, excluding the sprayer 420, i.e., the assembly of the body 410 with the motor 430 and chuck 440, is preferably provided by another handheld electric rotary tool. Generally, the abrasive unit 300 and / or the coating unit 400 are preferably combined with a rotary tool for operating the abrasive tool 310 or the sprayer 420 respectively. The rotary tool has its own separate body 320 / 410, which has a built-in motor 330 / 430 and an output connector 350 / 440 for connecting the abrasive tool 310 or the sprayer 420.

[0074] It is worth noting that the various motors mentioned above can be either electric motors or pneumatic motors, depending on technical requirements such as speed, torque, size, and ease of control.

[0075] The repair device 100 of this invention preferably includes one or more cameras on the drive unit 200, particularly at the front end of the drive unit body 210, and preferably also includes one or more cameras on its opposite side. The preferred positions of the cameras are... Figure 6 The term "Z" indicates that one or both cameras Z are preferably mounted at a high position on the collar structure 230. During operation, camera Z can capture real-time images of the area requiring repair on the inner surface 11 of the pipe section 10S to perform the aforementioned grinding / cleaning and coating operations. This allows the user to identify defective areas and monitor the repair process for satisfactory results.

[0076] Although not shown in the diagram (for simplicity), trailing behind the repair device 100 are the power cord for the motor, the pressurized air hose for the pneumatic motor, and the signal cable for the camera. These cables extend back to the user and support equipment at the exposed end of the conduit 10. The support equipment includes a power and pressurized gas supply, a console with controls for operating the repair device 100, and a screen for viewing the captured images.

[0077] It should be noted that the repair device 100 of this invention can repair all types of hollow cylindrical objects, that is, not limited to the pipes used to transport fluids or gases.

[0078] This invention is given by way of example only, and those skilled in the art can make various other modifications and / or alterations to the embodiments without departing from the scope of this invention as defined in the appended claims.

Claims

1. A repair device for repairing an inner surface of a hollow cylindrical object, characterized in that, The repair device includes: A drive unit having a moving mechanism for moving the entire drive unit in the hollow cylindrical object along an axial direction, the drive unit including a rotary actuator; A grinding unit, including a grinding tool for cleaning the inner surface, the grinding unit being supported and carried by the drive unit for operation, and being at least partially operated by the rotary driver; A positioning device for adjusting the position of the grinding tool so that the grinding tool abuts against the inner surface; and A coating unit for applying a coating to the inner surface cleaned by the abrasive tool, the coating unit being supported and carried by the drive unit for operation; The grinding unit and the coating unit can be selectively engaged with the drive unit for operation.

2. The prosthetic device of claim 1, wherein, The positioning device is driven to engage with the rotary driver for operation and is adapted to bring the abrasive tool into contact with the inner surface to perform brushing and cleaning of the inner surface with sufficient force.

3. The prosthetic device of claim 1, wherein, The moving mechanism includes a plurality of rotating members located on opposite sides of the drive unit, for supporting the entire drive unit relative to the inner surface and moving the entire drive unit along the inner surface.

4. The prosthetic device of claim 3, wherein, The rotating component includes wheels for directly engaging the inner surface.

5. The prosthetic device of claim 3, wherein, The drive unit includes an expandable bracket located on the side of the drive unit opposite to the rotating member, for abutting against the inner surface to hold the entire drive unit in a stable position relative to the inner surface.

6. The prosthetic device of claim 5, wherein, The drive unit includes a body having an upper portion that is movable upward and provides the expandable support.

7. The prosthetic device according to any of claims 1 to 6, wherein, The grinding unit is arranged to rotate via the rotary driver, thereby causing the grinding tool to move in a circular path along the inner surface about the axial direction.

8. The prosthetic device of claim 1, wherein, The positioning device is adapted to adjust the position of the grinding tool in the radial direction around the axial direction.

9. The prosthetic device of claim 8, wherein, The positioning device includes a slider adapted to hold the grinding tool and slide it radially.

10. The prosthetic device of claim 9, wherein, The positioning device includes at least one motor arranged to operate the slider.

11. The prosthetic device according to any one of claims 1 to 6, wherein, The grinding unit includes a rotary tool for operating the grinding tool, the rotary tool having a body with a built-in motor and an output connector for connecting the grinding tool.

12. The prosthetic device according to any one of claims 1 to 6, wherein, The grinding tool includes a rotating brush, and the grinding unit includes a built-in motor for operating the rotating brush.

13. The prosthetic device of claim 6, wherein, The grinding unit is supported and carried by the drive unit, and the positioning device is driven to engage with the rotary driver to perform operation.

14. The prosthetic device of claim 13, wherein, The rotary drive includes a motor and a drive transmission system, the drive transmission system being arranged to transmit the output drive of the motor to the positioning device in a deceleration manner.

15. The prosthetic device of claim 14, wherein, The drive transmission system includes at least a first gear and a second gear, which are driven to engage with the motor and the positioning device, respectively, and the second gear is much larger than the first gear.

16. The prosthetic device of claim 15, wherein, The second gear has a relatively large hole that is exposed through an opening in the body of the drive unit.

17. The prosthetic device according to any one of claims 1 to 6, wherein, In addition to the positioning device, the grinding unit can be detached from the driving unit to allow the coating unit to engage with the driving unit for operation.

18. The prosthetic device of claim 17, wherein, The positioning device has a hole through which the coating unit can be inserted to engage with the driving unit for operation.

19. The prosthetic device of claim 16, wherein, In addition to the positioning device, the grinding unit can be disengaged from the driving unit to allow the coating unit to engage with the driving unit for operation. The positioning device has holes aligned with the holes of the second gear, and the coating unit can be inserted into both holes to engage with the driving unit for operation.

20. The prosthetic device according to any one of claims 1 to 6, wherein, The coating unit includes a sprayer adapted to dispense and apply coating material onto the inner surface in a spray form.

21. The prosthetic device of claim 20, wherein, The sprayer is adapted to dispense coating material in a 360° manner around the central axis.

22. The prosthetic device of claim 21, wherein, The sprayer includes annular orifices arranged in a 360° pattern around a central axis for dispensing coating material.

23. The prosthetic device of claim 21, wherein, The sprayer can be rotated to distribute coating material by centrifugal force.

24. The prosthetic device of claim 21, wherein, The coating unit includes a built-in motor for operating the sprayer.

25. The prosthetic device of claim 21, wherein, The sprayer has an opening at the rear, through which coating material is supplied into the body of the sprayer.

26. The prosthetic device of claim 20, wherein, The coating unit includes a reservoir for containing coating material, the reservoir being supported and carried by the drive unit.

27. The prosthetic device of claim 24, wherein, The coating unit includes a body that supports the sprayer and houses the motor, the body being insertable into the drive unit for support and bearing.

28. The prosthetic device of claim 20, wherein, The coating unit includes a rotating tool for operating the sprayer, the rotating tool having a body with a built-in motor and an output connector for connecting to the sprayer.

29. The prosthetic device of claim 27, wherein, The drive unit includes an internal support for positioning the coating unit via the body when the body is inserted into the drive unit.

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