Automatic dip-coating and drying system for sucker rods

Abstract

This invention discloses an automatic dip-coating and drying system for sucker rods, comprising a circular track with multiple transfer carts mounted at the bottom. The transfer carts sequentially pass through a paint tank, a purging box, and a drying box along the circular track. The paint tank is located below the horizontal plane, while the purging box and drying box are located above the horizontal plane. A gas delivery pump A is installed between the purging box and the drying box, pumping the drying exhaust gas generated in the drying box into the purging box. A gas delivery pump B is installed between the paint tank and the purging box, pumping the paint mist-containing exhaust gas generated in the purging box into a vent pipe at the bottom of the paint tank. The vent pipe has several air outlets spaced along its length. A hot air blower is installed at the end of the drying box furthest from the purging box to supply hot air into the drying box. This invention effectively solves the problems of paint waste, heat energy waste and VOC pollution, uneven coating due to paint sedimentation, and low production efficiency existing in the prior art.

Description

Technical Field

[0001] This invention relates to an automatic dip-coating and drying system for sucker rods, belonging to the field of sucker rod coating technology. Background Technology

[0002] Sucker rods are slender rods that transmit power in oil wells, with the upper end connected to the polished rod and the lower end connected to the oil pump. To prevent surface corrosion of sucker rods due to environmental humidity, salt spray, and other factors during transportation, temporary storage, and open-air stacking after machining, before warehousing or shipment, their surfaces need to be impregnated with paint for rust prevention.

[0003] Currently, the coating and drying process for sucker rods is mostly carried out using traditional manual or semi-automated methods, and the following prominent problems still exist in actual production: Firstly, the excess paint adhering to the surface of the sucker rod after dipping is difficult to collect effectively during the dripping process, which not only causes a large waste of paint, but also easily pollutes the work site and increases cleaning costs.

[0004] Secondly, the high-temperature exhaust gas generated in the drying process is usually discharged directly, and the large amount of sensible heat it carries is wasted, resulting in low energy utilization. At the same time, the exhaust gas contains paint mist and volatile organic compounds (VOCs), which, if directly released into the workshop environment, will not only harm the health of the operators but also pollute the atmospheric environment.

[0005] Third, if the paint in the paint tank is left to stand for a long time, pigment sedimentation and component stratification are likely to occur, resulting in uneven paint film thickness on the surface of the sucker rod after immersion in paint, which affects the density and protective effect of the anti-rust layer.

[0006] Fourth, traditional hoisting and transportation methods rely on repeated lifting and lowering of gantry cranes and manual assistance in hooking, resulting in long connection times between various processes, low work efficiency, and difficulty in meeting the needs of continuous mass production.

[0007] In summary, the existing sucker rod impregnation and drying technology has significant shortcomings in terms of material utilization, energy consumption, coating quality, environmental performance, and automation level, and urgently needs further improvement. Summary of the Invention

[0008] To address the shortcomings of the prior art, this invention provides an automatic dip-coating and drying system for sucker rods, which can effectively solve the problems of paint waste, heat energy waste and VOC pollution, uneven coating due to paint sedimentation, and low production efficiency in the prior art.

[0009] To solve the above technical problems, the present invention adopts the following technical solution: An automatic dip-coating and drying system for sucker rods includes a circular track with multiple transfer carts mounted at the bottom. These carts travel sequentially along the track, passing a paint tank, a purge box, and a drying box. The paint tank is below the horizontal plane, while the purge box and drying box are above it. A gas pump A is installed between the purge box and the drying box, pumping the drying exhaust gas generated in the drying box into the purge box. A gas pump B is installed between the paint tank and the purge box, pumping the paint mist-containing exhaust gas generated in the purge box into a vent pipe at the bottom of the paint tank. The vent pipe has several air outlets spaced along its length. A hot air blower is installed at the end of the drying box furthest from the purge box to supply hot air into the drying box.

[0010] Furthermore, the transfer vehicle includes a transfer frame, the top of which is connected to a circular track via a set of wheels, which is driven by a motor; vertically arranged guide arms are symmetrically installed at both ends of the transfer frame, and the cross-section of the guide arms is U-shaped; a lifting arm is installed between the two guide arms, with both ends of the lifting arm extending into the corresponding guide arm, and guide wheels that roll in cooperation with the guide arm are installed at the ends.

[0011] Furthermore, a speed reducer is fixedly installed at the middle position of the bottom of the transfer vehicle frame. The side of the speed reducer is connected to the motor drive, and the motor provides the driving force. The speed reducer has two symmetrically arranged output ends, each of which is connected to a drive shaft. The outward ends of the two drive shafts are rotatably connected to the guide arms on the corresponding sides.

[0012] Furthermore, each of the two drive shafts is fixedly fitted with a drum for winding and unwinding the wire rope; the bottom end of the wire rope is connected to the lifting arm via a hanger; and two hooks are symmetrically arranged at the bottom of both ends of the lifting arm.

[0013] Furthermore, the drying chamber includes a drying chamber body, with two air distribution pipes symmetrically installed on the upper inner wall of the drying chamber body. The inlet end of the air distribution pipe is connected to the outlet of the hot air blower. Each air distribution pipe has several air outlets evenly opened along its length, and the air outlets are inclined downwards to blow the hot air supplied by the hot air blower downwards.

[0014] Furthermore, an exhaust gas collection pipe is installed at the bottom of the inner cavity of the drying chamber. The exhaust gas collection pipe is connected to the bottom of the V-shaped guide plate and penetrates the inner cavity of the V-shaped guide plate. The end of the exhaust gas collection pipe is connected to the inlet of the gas delivery pump A.

[0015] Furthermore, the purge box includes a purge box body, and two exhaust gas purge pipes are symmetrically installed on the upper inner wall of the purge box body. The inlet of the exhaust gas purge pipe is connected to the outlet of the gas delivery pump A. Each exhaust gas purge pipe has a number of air outlets evenly opened along its length direction, and the air outlets are inclined downward.

[0016] Furthermore, two gas collecting pipes are symmetrically installed on the lower inner wall of the purging box, and several suction holes are evenly opened along the length of the gas collecting pipes; the end of the gas collecting pipe is connected to the inlet of the gas delivery pump B, and the gas delivery pump B pumps the collected exhaust gas to the bottom of the paint tank for use as a stirring gas source.

[0017] Furthermore, a liquid collection pipe is installed at the bottom of the inner cavity of the purging box. The liquid collection pipe is connected to the bottom of the V-shaped guide plate and penetrates the inner cavity of the V-shaped guide plate. The end of the liquid collection pipe is connected to the paint tank through a return pipe.

[0018] Furthermore, both the purge chamber and the drying chamber are hinged to the top with outward-folding sealing covers, and each sealing cover has a clearance hole to allow the hook to pass when the sealing cover is closed.

[0019] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages: Through a two-stage raw material recovery process: the first stage recovers dripping paint by connecting the liquid collection pipe at the bottom of the blowbox directly to the paint tank via a return pipe, automatically diverting the dripping paint for reuse by gravity; the second stage recovers paint mist by pumping the paint mist-containing waste gas generated during the blowbox to the paint tank via a gas collection pipe, allowing the paint mist to return to the paint liquid; this achieves physical recovery of dripping paint and paint mist, significantly improving paint utilization and reducing raw material procurement costs.

[0020] Gas transfer pump A actively draws the dried exhaust gas to the exhaust gas purge pipe of the purge box, utilizing the residual heat of the exhaust gas to physically preheat the freshly dipped sucker rod, ensuring it has a certain base temperature before entering the drying box. This significantly shortens the subsequent drying and heating time, substantially reduces the energy consumption of the hot air blower, and achieves tiered energy utilization. Both the purge box and the drying box are equipped with outward-opening sealing covers. Two gas transfer pumps within the system continuously draw in air, creating a slightly negative pressure state within the boxes. All VOC-containing exhaust gases are not directly discharged but are forcibly drawn into the paint tank or used as a purge gas source, completely solving environmental compliance issues and improving the workshop working environment.

[0021] Gas delivery pump B pumps the collected exhaust gas into the vent pipe at the bottom of the paint tank, continuously agitating the paint liquid with air bubbles. This keeps the paint liquid in a uniform suspension state, ensuring the consistency and density of the coating on each bundle of sucker rods from the source; and it eliminates the need for an additional mechanical agitator, reducing equipment costs and failure rates.

[0022] A continuous, cyclical production line is formed by a circular track and multiple transfer vehicles, enabling mass production at rapid pace. The transfer vehicles feature a unique U-shaped guide arm and guide wheel structure, working in conjunction with synchronous lifting of dual drums. The dual guide arms constrain the lifting arm to prevent lateral swaying, ensuring extremely precise positioning of the sucker rod during paint impregnation and entry / exit from the sealed container, preventing collisions.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a structural diagram of the transfer vehicle; Figure 3 yes Figure 1 Enlarged view at point M; Figure 4 This is a schematic diagram of the internal structure of the purge box; Figure 5 This is a schematic diagram of the internal structure of the drying oven.

[0025] In the diagram, 1-circular track; 2-transfer vehicle; 21-transfer vehicle frame; 22-guide arm; 23-lifting arm; 24-guide wheel; 25-reducer; 26-drive shaft; 27-drum; 28-hanger; 29-hook; 3-paint tank; 31-vent pipe; 4-purge box; 41-purge box body; 42-exhaust gas purge pipe; 43-gas collection pipe; 44-liquid collection pipe; 5-drying box; 51-drying box body; 52-gas distribution pipe; 53-exhaust gas collection pipe; 6-hot air blower; 7-gas transfer pump A; 8-gas transfer pump B; 9-return pipe. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0027] like Figures 1-5 As shown in the figure, the present invention provides an automatic dip-coating and drying system for sucker rods, including a circular track 1. Multiple transfer carts 2 are installed at the bottom of the circular track 1. The transfer carts 2 transport bundles of sucker rods to various workstations along the circular track 1. The transfer carts 2 sequentially pass through a paint tank 3, a purge box 4, and a drying box 5 along the circular track 1. A gas delivery pump A7 is installed between the purge box 4 and the drying box 5, and a gas delivery pump B8 is installed between the paint tank 3 and the purge box 4. A hot air blower 6 is installed at the end of the drying box 5 furthest from the purge box 4.

[0028] The paint tank 3 is located below the horizontal plane and is used for the paint impregnation treatment of the sucker rod; the blow-blowing box 4 and the drying box 5 are located above the horizontal plane and are used for surface blowing and heating drying of the sucker rod after coating, respectively.

[0029] The transfer vehicle 2 includes a transfer frame 21, the top of which is rotatably connected to the circular track 1 via a set of wheels driven by a motor. Vertically arranged guide arms 22 are symmetrically mounted at both ends of the transfer frame 21, and the guide arms 22 have a U-shaped cross-section. A lifting arm 23, arranged laterally, is installed between the two guide arms 22. Both ends of the lifting arm 23 extend into the corresponding guide arm 22, and guide wheels 24, which roll in cooperation with the guide arm 22, are installed at the ends to ensure the smoothness of the lifting action.

[0030] The bottom of both ends of the lifting arm 23 is equipped with two symmetrically arranged hooks 29 for hoisting bundles of sucker rods.

[0031] A speed reducer 25 is fixedly installed at the bottom center of the transfer frame 21. The side of the speed reducer 25 is connected to a motor, which provides the driving force. The speed reducer 25 has two symmetrically arranged output ends, each of which is connected to a drive shaft 26. The outward ends of the two drive shafts 26 are rotatably connected to the guide arms 22 on the corresponding sides.

[0032] Both drive shafts 26 are fixedly fitted with drums 27 for winding and unwinding the wire rope; the bottom end of the wire rope is connected to the lifting arm 23 via a hanger 28.

[0033] The motor drives the wire rope to be wound up and down in sequence through the reducer 25, the drive shaft 26 and the drum 27, thereby realizing the smooth lifting and lowering of the lifting arm 23 and the bundled sucker rods.

[0034] A vent pipe 31 is installed at the bottom of the paint tank 3. Several air outlets are spaced apart along the length of the vent pipe 31. The inlet of the vent pipe 31 is connected to the outlet of the gas delivery pump B8 to introduce gas into the paint tank. This keeps the paint liquid in a flowing state during the impregnation process, preventing paint liquid sedimentation and stratification, and ensuring uniform coating on the surface of the sucker rod.

[0035] The drying chamber 5 includes a drying chamber body 51. Two air distribution pipes 52 are symmetrically installed on the upper inner wall of the drying chamber body 51. The inlet end of the air distribution pipe 52 is connected to the outlet of the hot air blower 6. Each air distribution pipe 52 has a plurality of air outlets evenly distributed along its length. The air outlets are inclined downwards to blow the hot air supplied by the hot air blower 6 downwards.

[0036] A tail gas collection pipe 53 is installed at the bottom of the inner cavity of the drying chamber 51. The tail gas collection pipe 53 is connected to the bottom of the V-shaped guide plate and penetrates the inner cavity of the V-shaped guide plate to collect the waste gas generated during the drying process. The end of the tail gas collection pipe 53 is connected to the inlet of the gas delivery pump A7.

[0037] The purge box 4 includes a purge box body 41. Two exhaust gas purge pipes 42 are symmetrically installed on the upper inner wall of the purge box body 41. The inlet of the exhaust gas purge pipe 42 is connected to the outlet of the gas delivery pump A7. Each exhaust gas purge pipe 42 has several air outlets evenly distributed along its length, with the air outlets inclined downwards to blow the drying exhaust gas downwards onto the surface of the bundled sucker rods that have been impregnated with paint. Through exhaust gas purging, excess paint adhering to the surface of the sucker rods can be blown off, and the residual heat of the exhaust gas can be used to preheat the sucker rods to facilitate the subsequent drying process.

[0038] Two air collection pipes 43 are symmetrically installed on the lower inner wall of the purging chamber 41. Each air collection pipe 43 has several suction holes evenly distributed along its length to collect the paint mist exhaust gas generated during the purging process. The end of the air collection pipe 43 is connected to the inlet of the gas delivery pump B8, which pumps the collected exhaust gas to the bottom of the paint tank 3 for use as a stirring gas source.

[0039] A collection pipe 44 is installed at the bottom of the inner cavity of the purge box 41. The collection pipe 44 is connected to the bottom of the V-shaped guide plate and penetrates the inner cavity of the V-shaped guide plate. It is used to collect excess paint dripping from the surface of bundled sucker rods. The end of the collection pipe 44 is connected to the paint tank 3 through the return pipe 9, so as to transport the collected paint back to the paint tank 3 and realize the recycling of paint.

[0040] Both the purge box 4 and the drying box 5 are hinged to the top with outward-opening sealing covers, which can open or close automatically to facilitate the entry and exit of the sucker rod. Each sealing cover is provided with a clearance hole to avoid the hook 29 when the sealing cover is closed, ensuring that the sealing cover can be fully closed, thereby ensuring that the drying and purge operations are carried out in a closed environment.

[0041] The specific working principle of this invention: The electric motor drives the wheelset on the top of the transfer vehicle 2, which moves cyclically along the circular track 1 to deliver bundles of sucker rods to the impregnation, purging, and drying stations in sequence.

[0042] Dipping: The lifting arm dips the sucker rod into the paint tank 3 in the pit. At this time, the gas delivery pump B8 supplies air to the vent pipe 31 at the bottom of the tank. The air bubbles agitate the paint liquid, keeping it flowing, preventing pigment sedimentation, and ensuring a uniform coating.

[0043] Purging: After being dipped in paint, the sucker rod is raised above ground level and enters the purging chamber 4. The gas delivery pump A7 draws the high-temperature exhaust gas from the drying chamber to the exhaust gas purging pipe 42, which is tilted downwards to purge the sucker rod. This process can blow off excess paint droplets, utilize the waste heat of the exhaust gas to preheat the workpiece, thus saving energy, and also remove the blown-off paint mist-containing gas, thus contributing to environmental protection.

[0044] Drying: The purged sucker rod enters the drying chamber 5. Hot air is generated by the hot air blower 6 and blown evenly downwards through the air distribution pipe 52 to complete the final curing.

[0045] This invention achieves dual recycling of heat and materials, significantly reducing energy consumption and raw material waste while ensuring coating quality. Hot air circulation path: Hot air (carrying paint volatiles) supplied to drying chamber 5 by hot air blower 6 → is forcibly drawn away from exhaust gas collection pipe 53 at the bottom by gas delivery pump A7 → directly sent to purge chamber 4 as purge gas source. Although the temperature of the exhaust gas after drying drops, it is still much higher than room temperature, and can be directly used for purge preheating, which can significantly reduce energy consumption.

[0046] Paint mist recovery path: The paint mist-containing exhaust gas in the purge box 4 is collected by the gas collection pipe 43 and then transported to the vent pipe 31 at the bottom of the paint tank 3 via the gas transfer pump B8. The paint mist in the exhaust gas is returned to the paint tank 3 to achieve paint recovery. At the same time, the gas is used as a stirring gas source for the paint liquid, and the exhaust gas itself carries residual heat, which helps to maintain the temperature of the paint liquid.

[0047] Dripping paint recycling: Dripping paint collected by the V-shaped guide plate at the bottom of the blow box flows back to the paint tank 3 through the collection pipe 44 and the return pipe 9, achieving direct recycling.

[0048] The above description provides examples of the preferred embodiments of the present invention. Parts not detailed herein are common knowledge to those skilled in the art. The scope of protection of the present invention is determined by the claims. Any equivalent modifications based on the technical teachings of the present invention are also within the scope of protection of the present invention.

Claims

1. An automatic dip-coating and drying system for sucker rods, characterized in that: The system includes a circular track (1), with multiple transfer vehicles (2) installed at the bottom of the circular track (1). The transfer vehicles (2) pass through the paint tank (3), the blowing box (4), and the drying box (5) in sequence along the circular track (1). The paint tank (3) is located below the horizontal plane, while the blowing box (4) and the drying box (5) are located above the horizontal plane. A gas delivery pump A (7) is installed between the blowing box (4) and the drying box (5). The gas delivery pump A (7) pumps the drying exhaust gas generated in the drying box (5) to the blowing box (4). A gas delivery pump B (8) is installed between the paint tank (3) and the blowing box (4). The gas delivery pump B (8) pumps the paint mist exhaust gas generated in the blowing box (4) to the ventilation pipe (31) at the bottom of the paint tank (3). Several air outlets are spaced along the length of the ventilation pipe (31). A hot air blower (6) is installed at the end of the drying box (5) away from the blowing box (4) to supply hot air into the drying box (5).

2. The automatic dip-coating and drying system for sucker rods as described in claim 1, characterized in that: The transfer vehicle (2) includes a transfer frame (21), the top of which is connected to the ring track (1) by a set of walking wheels, which is driven by a motor. Vertically arranged guide arms (22) are symmetrically installed at both ends of the transfer frame (21), and the transverse cross section of the guide arms (22) is a U-shaped structure. A lifting arm (23) is installed between the two guide arms (22) and is arranged in a transverse direction. The two ends of the lifting arm (23) extend into the corresponding guide arm (22) respectively, and a guide wheel (24) is installed at the end that rolls with the guide arm (22).

3. The automatic dip-coating and drying system for sucker rods as described in claim 2, characterized in that: A speed reducer (25) is fixedly installed at the middle of the bottom of the transfer frame (21). The side of the speed reducer (25) is connected to the motor drive, and the motor provides the driving force. The speed reducer (25) has two symmetrically arranged output ends, each of which is connected to a drive shaft (26). The opposite outer ends of the two drive shafts (26) are rotatably connected to the guide arm (22) on the corresponding side.

4. The automatic dip-coating and drying system for sucker rods as described in claim 3, characterized in that: Two drive shafts (26) are each fixedly fitted with a drum (27) for winding and unwinding the wire rope; the bottom end of the wire rope is connected to the lifting arm (23) through a hanger (28); two hooks (29) are symmetrically arranged at the bottom of both ends of the lifting arm (23).

5. The automatic dip-coating and drying system for sucker rods as described in claim 1, characterized in that: The drying box (5) includes a drying box body (51). Two air distribution pipes (52) are symmetrically installed on the upper inner wall of the drying box body (51). The inlet end of the air distribution pipe (52) is connected to the outlet of the hot air blower (6). Each air distribution pipe (52) has several air outlets evenly opened along its length. The air outlets are inclined downwards to blow the hot air supplied by the hot air blower (6) downwards.

6. The automatic dip-coating and drying system for sucker rods as described in claim 5, characterized in that: The bottom of the inner cavity of the drying chamber (51) is equipped with a tail gas collection pipe (53), which is connected to the bottom of the V-shaped guide plate and penetrates the inner cavity of the V-shaped guide plate; the end of the tail gas collection pipe (53) is connected to the inlet of the gas delivery pump A (7).

7. The automatic dip-coating and drying system for sucker rods as described in claim 1, characterized in that: The purge box (4) includes a purge box body (41). Two exhaust gas purge pipes (42) are symmetrically installed on the upper inner wall of the purge box body (41). The inlet of the exhaust gas purge pipe (42) is connected to the outlet of the gas delivery pump A (7). Each exhaust gas purge pipe (42) has several air outlets evenly opened along its length direction, and the air outlets are inclined downward.

8. The automatic dip-coating and drying system for sucker rods as described in claim 7, characterized in that: Two gas collecting pipes (43) are symmetrically installed on the lower inner wall of the purging box (41). The gas collecting pipes (43) have a number of suction holes evenly opened along their length. The end of the gas collecting pipes (43) is connected to the inlet of the gas delivery pump B (8). The gas delivery pump B (8) pumps the collected exhaust gas to the bottom of the paint tank (3) for use as a stirring gas source.

9. The automatic dip-coating and drying system for sucker rods as described in claim 8, characterized in that: The bottom of the inner cavity of the purging box (41) is equipped with a liquid collection pipe (44), which is connected to the bottom of the V-shaped guide plate and penetrates the inner cavity of the V-shaped guide plate; the end of the liquid collection pipe (44) is connected to the paint tank (3) through the return pipe (9).

10. The automatic dip-coating and drying system for sucker rods as described in claim 1, characterized in that: The top of the purge box (4) and the drying box (5) are both hinged with outward-folding sealing covers, and each sealing cover is provided with a clearance hole to avoid the hook (29) when the sealing cover is closed.

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