Petroleum drill rod inner wall coating coating device
The combined use of the spray tube and radial nozzle solves the problems of uneven coating on the inner wall of the oil drill pipe and large amount of coating consumption, achieves the effect of coating uniformity and paint saving, and extends the service life of the oil drill pipe.
Patent Information
- Application Number
- CN202422945435.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-12-02
AI Technical Summary
The existing coating device for the inner wall of oil drill pipe has the problems of uneven coating, large roughness and large amount of coating, which leads to high cost of use.
The spray tube and radial nozzle are combined with a rolling support structure. The spray tube is driven by a rotary motor to rotate and move along the inner wall of the drill pipe to achieve uniform spraying, avoid contact with the drill pipe, and use the radial nozzle to spray the paint.
The smoothness and density of the coating are improved, the amount of paint used is reduced, and the cost of use is reduced.
Smart Images
Figure CN223312288U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil drill pipe anti-corrosion treatment equipment, in particular to a coating device for the inner wall of an oil drill pipe. Background Art
[0002] Drill pipe is the rod that connects to the drill bit and transmits power during the oil drilling process. It connects the drilling rig's surface equipment to the drilling and grinding equipment or bottom-hole device at the bottom of the well, transporting drilling mud to the drill bit. During operation, drill pipe must withstand significant internal and external pressure, as well as torsion, bending, and vibration. Therefore, the mechanical properties of drill pipe are particularly demanding. To improve the wear resistance of the inner wall of the drill pipe and extend its service life, an anti-corrosion coating is typically applied to the inside of the drill pipe to prevent corrosion and wear.
[0003] CN 114160358 B discloses a device for coating the inner wall of a drill pipe, comprising a support assembly, a spray assembly, and a drive assembly. The support assembly comprises a base, one end of the upper surface of which is fixedly connected to a fixed slide, the middle portion of the upper surface of which is fixedly connected to a center frame, the upper end of which is annular. The spray assembly comprises a tail pipe, one end of which passes through the center frame and is matingly connected to a barrel, the outer side of which is matingly connected to multiple sets of roller brushes. This device is suitable for relatively long drill pipes. The inner wall of the drill pipe is coated with a roller brush. The forward and backward movement of the spray assembly is controlled by a screw and a rotating handwheel to ensure uniform coating thickness. However, the following problems exist during use: 1. The roller brush contacts the inner wall of the drill pipe and applies paint as it moves forward, resulting in an uneven and rough coating on the inner wall of the drill pipe; 2. The amount of paint used is large, resulting in high cost. Utility Model Content
[0004] The purpose of the utility model is to provide a coating device for the inner wall of a petroleum drill pipe to solve the above problems, significantly improve the smoothness and density of the coating surface, avoid shedding, extend the service life, and save the amount of coating.
[0005] The technical solution of the utility model is:
[0006] The slidable support is an annular support for connecting to one end of the oil drill pipe, and an X-axis screw nut transmission mechanism is provided at the bottom of the slidable support. Two rolling support structures are provided at intervals on the front of the outer wall of the spray pipe. The front end of the spray pipe is connected to the movable head by a rotary joint. The front end periphery of the movable head is provided with a radial nozzle, and the rear end periphery of the movable head is fixed with an annular support. The rear end of the annular support is fixed with a conical gear ring structure. The front end upper surface of the spray pipe supports a bevel gear assembly meshed with the conical gear ring structure. The rear end of the spray pipe passes through the slidable support along the X direction, and the rear end top of the slidable support is fixed with a feed frame. The linear feed mechanism includes a feed wheel provided on the feed frame, and a rack structure provided on the upper surface of the spray pipe and meshed with the feed wheel.
[0007] The above-mentioned oil drill pipe inner wall coating device, the rolling support structure includes a fixed seat arranged on the inner circle and outer square of the outer wall of the spray pipe, a positioning seat evenly arranged on the four sides of the fixed seat, a telescopic spring arranged in the positioning seat, a wheel frame arranged at the free end of the telescopic spring, and a roller arranged on the wheel frame, and the axis of the roller is perpendicular to the center line of the spray pipe.
[0008] The above-mentioned oil drill pipe inner wall coating device has two groups of radial nozzles, which are arranged at intervals along the length direction of the movable head. Each group of radial nozzles includes two radial nozzles symmetrically arranged on both sides of the center line of the spray pipe, and the two groups of radial nozzles are arranged in a cross shape.
[0009] In the above-mentioned oil drill pipe inner wall coating device, the bevel gear axle of the bevel gear assembly is connected to the output end of the rotating motor, a right-angle bracket is provided on the front upper surface of the spray pipe, and the rotating motor is fixed on the right-angle bracket.
[0010] The beneficial effects of the utility model are:
[0011] During operation, the movable head in front of the spray tube rotates driven by the conical ring gear structure and bevel gear assembly, driving the radial nozzles to spray the coating powder material onto the inner wall of the drill pipe. During this process, two rolling support structures are used to provide stable support for the spray tube's movement, ensuring that the spray tube is always centered on the drill pipe, avoiding deviation and ensuring uniform spraying. Compared to existing roller brush coating, the spraying effect does not contact the drill pipe, resulting in a smooth and dense coating. This spraying process also saves raw materials and reduces operating costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural diagram of the utility model;
[0013] Figure 2 It is a diagram of the use state of the utility model;
[0014] Figure 3 This is a state diagram of the utility model in the later stage of operation;
[0015] Figure 4 yes Figure 1 Enlarged view of part A in the middle.
[0016] In the figure: 1. Rolling support structure, 2. Oil drill pipe, 3. Spray pipe, 4. Rack structure, 5. Slidable support, 6. Feed rack, 7. Feed wheel, 8. X-axis screw and nut transmission mechanism, 9. Radial nozzle, 10. Movable head, 11. Annular bracket, 12. Rotating motor, 13. Bevel gear assembly, 14. Roller, 15. Telescopic spring, 16. Positioning seat, 17. Fixed seat, 18. Right-angle bracket, 19. Conical ring gear structure, 20. Rotary joint. DETAILED DESCRIPTION
[0017] The utility model is described in detail according to the accompanying drawings.
[0018] like Figures 1 to 4 As shown, the oil drill pipe inner wall coating device includes a spray pipe 3, a slidable support 5 and a linear feed mechanism.
[0019] The slidable support 5 is an annular support for connecting with one end of the oil drill pipe 2 , and an X-axis screw and nut transmission mechanism 8 is provided at the bottom of the slidable support 5 .
[0020] Two rolling support structures 1 are spaced apart at the front of the outer wall of the spray tube 3. In this embodiment, the rolling support structure 1 includes a fixed seat 17 provided on the outer square of the inner circle of the outer wall of the spray tube 3, positioning seats 16 evenly provided on the four sides of the fixed seat 17, a telescopic spring 15 provided in the positioning seat 16, a wheel frame provided at the free end of the telescopic spring 15, and a roller 14 provided on the wheel frame, wherein the axis of the roller 14 is perpendicular to the center line of the spray tube 3.
[0021] The front end of the spray pipe 3 is connected to the movable head 10 by a rotary joint 20. The outer periphery of the front end of the movable head 10 is provided with a radial nozzle 9. The number of the radial nozzles 9 is two groups, which are arranged at intervals along the length direction of the movable head 10. Each group of radial nozzles 9 includes two radial nozzles 9 symmetrically arranged on both sides of the center line of the spray pipe 3, and the two groups of radial nozzles 9 are arranged in a cross shape.
[0022] An annular bracket 11 is fixed to the outer periphery of the rear end of the movable head 10. A conical ring gear structure 19 is fixed to the rear end of the annular bracket 11. The front upper surface of the spray pipe 3 supports a bevel gear assembly 13 that meshes with the conical ring gear structure 19. The bevel gear shaft of the bevel gear assembly 13 is connected to the output end of the rotary motor 12. A right-angle bracket 18 is provided on the front upper surface of the spray pipe 3, and the rotary motor 12 is fixed to the right-angle bracket 18.
[0023] The rear end of the spray tube 3 passes through a slidable support 5 along the X direction, and a feed frame 6 is fixed to the top of the rear end of the slidable support 5. The linear feed mechanism includes a feed wheel 7 provided on the feed frame 6 and a rack structure 4 provided on the upper surface of the spray tube 3 and meshing with the feed wheel 7.
[0024] Working principle:
[0025] During use, the two rolling support structures 1 are supported within the oil drill pipe 2. The movable head 10 moves to the front end of the oil drill pipe 2, and the electrostatic spraying high-voltage power supply is activated. The spraying material is injected into the spray pipe 2 and then sprayed out through the radial nozzles 9 at the front end of the movable head 10. During this process, the rotary motor 112 is activated, and power is transmitted to the movable head 10 through the conical ring gear structure 19 and the bevel gear assembly 13, causing it to rotate, thereby driving the radial nozzles 9 to rotate. At the same time, the drive motor drives the feed wheel 7 to rotate, and the rack structure 4 drives the spray pipe 3 to move at a set speed within the oil drill pipe 2 toward the rear end of the drill pipe, thereby achieving uniform spraying of the drill pipe inner wall.
[0026] At the end of spraying, see Figure 3 The two rolling support structures 1 enter the slidable support 5, and the X-axis screw nut transmission mechanism 8 is used to drive the slidable support 5 to move away from the drill pipe. Finally, the radial spray head 9 completes the spraying of the inner surface of the rear end of the drill pipe to ensure the integrity of the spraying.
[0027] The above detailed description of the embodiments of the present invention is intended to be a preferred embodiment of the present invention and should not be construed as limiting the scope of implementation of the present invention. Any equivalent changes and improvements made within the scope of the present invention shall still fall within the scope of this patent.
Claims
1. A coating device for the inner wall of a petroleum drill pipe, comprising a spray pipe, a slidable support and a linear feed mechanism, characterized in that: The slidable support is an annular support for connecting to one end of the oil drill pipe. An X-axis screw and nut transmission mechanism is provided at the bottom of the slidable support. Two rolling support structures are provided at intervals on the front part of the outer wall of the spray pipe. The front end of the spray pipe is connected to the movable head by a rotary joint. A radial nozzle is provided at the outer periphery of the front end of the movable head. An annular bracket is fixed to the outer periphery of the rear end of the movable head. A conical gear ring structure is fixed to the rear end of the annular bracket. A bevel gear assembly meshing with the conical gear ring structure is supported on the upper surface of the front end of the spray pipe. The rear end of the spray pipe passes through the slidable support along the X direction. A feed rack is fixed to the top of the rear end of the slidable support. The linear feed mechanism includes a feed wheel provided on the feed rack and a rack structure provided on the upper surface of the spray pipe and meshing with the feed wheel.
2. The device for coating the inner wall of a petroleum drill pipe according to claim 1, characterized in that: The rolling support structure includes a fixed seat arranged on the inner circle and outer square of the outer wall of the spray pipe, a positioning seat evenly arranged on the four sides of the fixed seat, a telescopic spring arranged in the positioning seat, a wheel frame arranged at the free end of the telescopic spring, and a roller arranged on the wheel frame, and the axis of the roller is perpendicular to the center line of the spray pipe.
3. The device for coating the inner wall of a petroleum drill pipe according to claim 1, characterized in that: There are two groups of radial nozzles, which are arranged at intervals along the length direction of the movable head. Each group of radial nozzles includes two radial nozzles symmetrically arranged on both sides of the center line of the spray pipe, and the two groups of radial nozzles are arranged in a cross shape.
4. The device for coating the inner wall of a petroleum drill pipe according to claim 1, characterized in that: The bevel gear shaft of the bevel gear assembly is connected to the output end of the rotary motor. A right-angle bracket is provided on the upper surface of the front end of the spray pipe, and the rotary motor is fixed on the right-angle bracket.