A large marine pulley anti-pollution automatic paint spraying device

Abstract

This invention provides an automatic anti-pollution painting device for large offshore pulleys, relating to the technical field of offshore oil and gas extraction equipment. The device includes: a housing with an internal painting space; a drive mechanism including a motor and a pulley power shaft connected to the motor's output shaft, with the pulley to be painted connected to the power shaft; two sets of painting hub assemblies, each connected to the power shaft and symmetrically arranged on both sides of the pulley to be painted, each hub assembly including a hub body and multiple spray nozzles on the hub body; and a paint supply mechanism including a spray rod extending into the hub assembly for supplying paint to the spray nozzles. This invention enables efficient and rapid painting of pulleys, achieving good paint uniformity while significantly improving work efficiency. Furthermore, it prevents paint from spreading in the air, protecting the surrounding environment of the construction area.

Description

Technical Field

[0001] This invention relates to the field of offshore oil and gas extraction equipment technology, and in particular to an automatic anti-pollution spraying device for large offshore pulleys. Background Technology

[0002] After the annual inspection of the overhead crane pulleys of offshore oil and gas extraction equipment, the traditional practice is to place the pulleys horizontally, paint them, and then flip them over to paint the other side.

[0003] The applicant has discovered that the prior art has at least the following technical problems: 1. The inability to spray paint evenly and synchronously on both sides of the pulley results in defects such as uneven paint application, paint adhesion, peeling and flaking, which require repeated repairs. Uneven paint drying also leads to poor adhesion, and if the paint comes into contact with other objects before it is fully dry, it is very easy to cause paint peeling and flaking, resulting in rework.

[0004] 2. Open-air spray painting environments also generate a large amount of volatile organic compounds (VOCs), which pollute the atmosphere. The sprayed liquid diffuses into the air, causing waste of resources and affecting the health of construction workers. 3. Manual spray painting is inefficient, results in uneven coating, is labor-intensive, and makes it difficult to control the coating quality.

[0005] Therefore, there is a need for an automatic anti-pollution painting device for large marine pulleys that can improve the success rate of one-time painting of pulleys and prevent pollution of the surrounding environment during construction to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide an automatic anti-pollution painting device for large marine pulleys, solving the technical problems existing in the prior art, such as uneven spraying, environmental pollution, low painting efficiency, and difficulty in controlling spraying quality. The various technical effects of the preferred technical solutions provided by this invention are detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention provides an automatic anti-pollution spraying device for large marine pulleys, comprising: The housing, the interior of which forms a painting space; The drive mechanism includes a motor and a pulley power spindle connected to the output shaft of the motor, wherein the pulley to be sprayed is connected to the pulley power spindle; Two sets of paint spraying hub assemblies are connected to the pulley power main shaft and are symmetrically arranged on both sides of the pulley to be painted. Each set of paint spraying hub assemblies includes a paint spraying hub body and multiple paint spray nozzles arranged on the paint spraying hub body. The paint supply mechanism includes a paint spray bar that extends into the paint spray hub assembly for supplying paint to the paint spray nozzle.

[0008] Furthermore, the housing includes: A base plate, wherein a waste discharge hole is provided on the base plate, the waste discharge hole being used to discharge waste paint from the box body; Three sets of side plates are fixedly connected to the base plate around its perimeter, forming an accommodating space with an opening on one side; Side push plate, used to close the opening; A top cover plate is placed on top of the side plate and the side push plate.

[0009] Furthermore, a wedge-shaped walker is provided on the lower part of one side of the side push plate, and a sealing structure is provided on the other side. The wedge-shaped walker includes a wedge block, a spring, a spherical caster, and a wheel axle, wherein: The wedge block is fixed to the lower part of the side push plate, and its bottom is provided with a receiving cavity with the opening facing downward. The two side walls of the receiving cavity are provided with shaft grooves. The spring is disposed inside the receiving cavity, with its upper end abutting against the top wall of the receiving cavity and its lower end abutting against the spherical caster; The spherical caster is mounted in the axle groove via the axle, and tends to extend downward out of the receiving cavity under the action of the spring; When the side push plate is lifted, the spherical caster extends under the action of the spring and supports the ground, allowing the side push plate to move back and forth; When the side push plate is lowered, the spherical caster is squeezed back into the receiving cavity, the bottom of the side push plate contacts and positions itself in contact with the ground, and the sealing structure on the other side of the side push plate is squeezed and sealed with the adjacent side plate.

[0010] Furthermore, the paint-sprayed hub body includes: The main body adopts a circular plate structure, with a shaft hole in the center for connecting to the pulley power main shaft, and multiple paint outlet holes are evenly distributed along the periphery of the shaft hole. The edge of the main body is provided with a flange integrally formed with the main body. The track disk includes an outer ring and an inner ring coaxially arranged with the main body. The outer ring is fixedly connected to the flange, and the inner ring is connected to the main body. An annular channel is formed between the outer ring and the inner ring.

[0011] Furthermore, the paint spraying rod includes an inner rod and an outer rod nested together, the inner rod being able to slide relative to the outer rod to adjust the length of the paint spraying rod, and the end of the inner rod is provided with a paint spraying track ball; The paint spraying rod extends into the paint spraying hub body through the annular channel, and the paint spraying track ball abuts against the annular circumferential surface with paint outlet holes, and can slide relative to the annular circumferential surface to close or open the paint outlet holes.

[0012] Furthermore, the paint spraying hub body also includes a washer ring, which is disposed between the body and the paint spraying track ball, and the washer ring has washer ring holes that correspond one-to-one with the paint outlet holes.

[0013] Furthermore, the paint spray nozzle includes a spherical mounting portion and a conical spraying portion, wherein: The outer contour of the spherical mounting part is spherical, which is used to rotatably mount it on the paint spraying hub assembly, and the spherical mounting part is provided with a paint inlet hole; The conical spray section gradually tapers outward from the spherical mounting section, and its end is provided with a paint spray hole; The inside of the paint nozzle is provided with a cavity that connects the paint feeding hole and the paint spraying hole.

[0014] Furthermore, the paint spraying hub assembly also includes a nozzle pressure plate, which is connected to the outside of the paint spraying hub body. The nozzle pressure plate is provided with a plurality of mounting holes, and the spherical mounting part is movably disposed between the nozzle pressure plate and the paint spraying hub body. The conical spraying part extends out from the mounting holes.

[0015] Furthermore, it also includes a support mechanism, which is disposed within the housing and includes two sets of "Y-shaped" support frames, two sets of support connecting rods, and two sets of limiting spring clips, wherein: The two ends of the support rod are respectively threaded, and the two sets of support rods are respectively connected to both sides of the pulley power main shaft. The other end of one set of support rods is connected to the motor output shaft, and the other set of support rods is fixed to the outside of the side push plate by fasteners. The two sets of "Y-shaped" support frames are supported one-to-one on the bottom of the two sets of support rods.

[0016] Furthermore, it also includes a waste paint discharge and collection mechanism, which comprises: a waste paint jet pump suction assembly and a waste paint collection tank. The waste paint jet pump suction assembly includes a U-shaped tube and a Venturi tube, wherein: The U-shaped tube has a waste suction port and a waste discharge port, and the waste suction port is connected to the waste discharge hole on the bottom plate; The venturi tube has a high-pressure inlet, a negative-pressure inlet, and a mixing outlet. The negative-pressure inlet is connected to the waste outlet of the U-shaped tube. The high-pressure inlet is used to receive high-pressure gas. The mixing outlet is connected to the waste paint collection bucket.

[0017] The waste paint collection bucket is used to collect the extracted waste paint.

[0018] This invention provides an automatic anti-pollution painting device for large marine pulleys. By setting up a housing, the painting process is changed from an open to a closed system, confining the paint mist within the housing and preventing paint from spreading in the air, thus protecting the surrounding environment of the construction area. Furthermore, the housing has an openable and closable installation port, facilitating the quick loading and unloading of the pulleys and internal equipment, improving on-site construction efficiency. Two sets of painting hub assemblies are symmetrically arranged on both sides of the pulley to be painted and connected to the same pulley power shaft, enabling simultaneous painting of both sides of the pulley. This eliminates the need to flip the pulley after painting one side before painting the other, ensuring good paint uniformity while avoiding paint sticking, peeling, and rework caused by flipping. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the automatic anti-pollution spraying device for large marine pulleys of the present invention; Figure 2 yes Figure 1 Schematic diagram of the internal structure of the middle box; Figure 3 yes Figure 2 Schematic diagram of the exploded structure inside the middle box; Figure 4 This is a schematic diagram of the pulley power main shaft in the large marine pulley anti-pollution automatic spray painting device of the present invention; Figure 5 This is a schematic diagram of the side push plate in the automatic anti-pollution spraying device for large marine pulleys of the present invention; Figure 6 yes Figure 5 A schematic diagram of the exploded structure; Figure 7 This is an exploded structural diagram of the paint spraying hub body in the marine large pulley anti-pollution automatic spraying device of the present invention; Figure 8 This is a schematic diagram of the main structure of the automatic anti-pollution spraying device for large marine pulleys of the present invention; Figure 9 This is a schematic diagram of the spray nozzle structure in the automatic anti-pollution spraying device for large marine pulleys of the present invention; Figure 10 yes Figure 9 A structural diagram from another angle; Figure 11This is a schematic diagram of the waste paint discharge and collection mechanism in the marine large pulley anti-pollution automatic spray painting device of the present invention; Figure 12 yes Figure 11 A partially enlarged schematic diagram of the waste paint discharge and collection mechanism.

[0021] In the diagram: 1. Housing; 11. Base plate; 110. Waste discharge hole; 12. Side plate; 13. Side push plate; 131. Sealing strip; 14. Top cover plate; 140. Handle; 141. Sealing strip; 2. Drive mechanism; 21. Motor; 22. Pulley power spindle; 221. Limiting circlip; 3. Painted hub assembly; 31. Painted hub body; 310. Paint outlet; 311. Main body; 312. Flange; 313. Track disk; 3131. Outer ring; 3132. Inner ring; 314. Ring 315. Shaped channel; 32. Paint nozzle; 321. Spherical mounting part; 322. Conical spray part; 33. Nozzle pressure plate; 4. Paint supply mechanism; 41. Paint spray bar; 42. Paint spray track ball; 5. Pulley to be sprayed; 6. Wedge walker; 61. Wedge block; 62. Spherical caster; 63. Spring; 64. Wheel axle; 7. Support mechanism; 71. "Y-type" support frame; 72. Support link; 8. Waste paint discharge and collection mechanism; 811. U-shaped tube; 812. Venturi tube. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] In the description of this invention, it should be understood that the terms "center," "side," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] like Figures 1-3 As shown, this embodiment provides an automatic anti-pollution painting device for large marine pulleys, including a housing 1, a drive mechanism 2, a paint spraying hub assembly 3, and a paint supply mechanism 4.

[0026] like Figure 2 As shown, the housing 1 in this embodiment includes a bottom plate 11, three sets of side plates 12, a side push plate 13, and a top cover 14. The bottom plate 11 has a waste discharge hole 110 for discharging waste paint from the housing 1. The three sets of side plates 12 are U-shaped and fixedly connected to the bottom plate 11 around its perimeter, forming an accommodating space with an opening on one side. The side push plate 13 is used to close this opening. Specifically, the edge of the side push plate 13 in this embodiment is provided with a sealing strip 131 for pressing and sealing against adjacent side plates and the bottom plate. The top cover 14 covers the top of the side plates 12 and the side push plate 13. The top surface of the top cover 14 has a handle 140, and the bottom surface has a sealing strip 141 for sealing by pressing down on the sealing strip under its own weight.

[0027] In this embodiment, both the side push plate 13 and the top cover plate 14 of the housing 1 can be opened to facilitate the quick installation of internal equipment, thus creating a painting space inside the housing 1. By providing an openable side push plate 13 and a top cover plate 14 with a sealing structure, the housing 1 achieves a seal against paint mist leakage while allowing for quick opening and installation of the paint spraying hub assembly 3 and the paint supply mechanism 4. It also facilitates the discharge of waste paint, meeting usage requirements.

[0028] To facilitate the installation of the paint supply mechanism 4, both the side push plate 13 and the side plate 12 opposite to the side push plate 13 in this embodiment are provided with holes for the paint spraying rod 41 to extend into. In addition, the side plate 12 opposite to the side push plate 13 is also provided with an outlet for connecting to the drive mechanism 2 outside the housing 1.

[0029] like Figure 2 and Figure 3 As shown, the drive mechanism 2 includes a motor 21 and a pulley power shaft 22 connected to the output shaft of the motor 21. The pulley 5 to be painted is connected to the pulley power shaft 22. In this embodiment, the motor 21 is a direct drive motor, which reduces transmission links and failure points, and improves rotational smoothness and paint uniformity.

[0030] To facilitate the positioning of the spraying pulley 5, such as Figure 4 As shown, in this embodiment, the pulley power spindle 22 is provided with a key and a limiting snap ring 221. The key is used to connect with the paint spraying hub assembly 3. The limiting snap ring 221 includes two sets, which are respectively placed on both sides of the pulley 5 to be painted, so as to limit the axial displacement of the pulley 5 to be painted.

[0031] like Figure 3 As shown, two sets of paint spraying hub assemblies 3 are both connected to the pulley power spindle 22 and symmetrically arranged on both sides of the pulley 5 to be painted. Each set of paint spraying hub assemblies 3 includes a paint spraying hub body 31 and multiple paint spray nozzles 32 arranged on the paint spraying hub body 31. By symmetrically arranging the two sets of paint spraying hub assemblies 3 on both sides of the pulley 5 to be painted and connecting them to the same pulley power spindle 22, simultaneous painting of both sides of the pulley is achieved. It is not necessary to flip the pulley after painting one side and then paint the other side, thus avoiding paint sticking, peeling, and rework caused by flipping.

[0032] The paint supply mechanism 4 includes a paint spray bar 41, which extends into the paint spray hub assembly 3 and is used to supply paint to the paint spray nozzle 32.

[0033] This large-scale marine pulley anti-pollution automatic spraying device can uniformly spray paint onto fixed pulleys, and simultaneously stop spraying when the pulley stops rotating, preventing paint peeling caused by uneven spraying. It achieves the goal of both efficient and rapid spraying and preventing paint from spreading in the air and polluting the environment.

[0034] As an optional implementation method, such as Figure 5 and Figure 6 As shown, in this embodiment, a wedge-shaped walker 6 is provided on the lower part of one side of the side push plate 13, and a sealing strip is provided on the other side. The wedge-shaped walker 6 includes a wedge block 61, a spring 63, a ball caster 62, and a wheel axle 64.

[0035] The wedge block 61 is fixed to the lower part of the side push plate 13. Its bottom has a receiving cavity with an opening facing downward. The two side walls of the receiving cavity have vertically extending shaft grooves. The spring 63 is located in the receiving cavity. Its upper end abuts against the top wall of the receiving cavity, and its lower end abuts against the spherical caster 62. The spherical caster 62 is installed in the shaft groove through the wheel axle 64. The two ends of the wheel axle 64 are respectively embedded in the shaft grooves on both sides and can slide up and down along the shaft groove. Under the action of the spring 63, it has a tendency to extend downward out of the receiving cavity.

[0036] When the side push plate 13 is lifted, the spherical caster 62 extends under the action of the spring and supports the ground, allowing the side push plate 13 to move flexibly back and forth; when the side push plate 13 is lowered, the spherical caster 62 is compressed and retracts into the receiving cavity, the bottom of the side push plate 13 contacts and positions itself with the ground, and the sealing strip 131 on the other side of the side push plate 13 is compressed and sealed with the adjacent side plate. It can be operated by a single person and is flexible and convenient to use. As an optional implementation method, such as Figure 7 As shown, the paint spraying hub body 31 includes a main body 311 and a track disk 313.

[0037] The main body 311 adopts a circular plate structure, with a shaft hole in the center for connecting with the pulley power main shaft 22. Multiple paint outlet holes 310 are evenly distributed along the periphery of the shaft hole, and a flange 312 integrally formed with the main body 311 is provided at the edge of the main body 311.

[0038] The track disk 313 includes an outer ring 3131 and an inner ring 3132 coaxially arranged with the main body 311. The outer ring 3131 is fixedly connected to the flange 312, and the inner ring 3132 is connected to the main body 311. An annular channel 314 is formed between the outer ring 3131 and the inner ring 3132.

[0039] Specifically, in this embodiment, the paint spray bar 41 includes an inner rod and an outer rod nested together. The annular space between the inner rod and the outer rod is sealed by a sealing ring. The inner rod can slide relative to the outer rod to adjust the length of the paint spray bar 41. The end of the inner rod is provided with a paint spray track ball 42. The inside of the paint spray track ball 42 is a cavity and the end is provided with a hole. The diameter of the hole is slightly smaller than the diameter of the inlet of the paint spray nozzle.

[0040] The paint spray bar 41 extends into the paint spray hub body 31 through the annular channel 314, and the paint spray track ball 42 abuts against the annular circumferential surface with the paint outlet 310 and can slide relative to the annular circumferential surface to close or open the paint outlet 310.

[0041] In use, as the paint track ball slides along the annular circumference, it alternately closes and opens the paint outlet 310, thereby achieving intermittent paint supply. When the paint hub assembly 3 stops rotating, the paint track ball 42 stops sliding and stops supplying paint, thus achieving intermittent paint supply and stopping spraying when the hub stops rotating, avoiding paint waste and pollution.

[0042] To improve sealing, such as Figure 8 As shown, the paint spraying hub body 31 in this embodiment also includes a washer ring 315. The washer ring 315 is disposed between the body 311 and the paint spraying track ball 42. The washer ring 315 has washer ring holes that correspond one-to-one with the paint outlet holes 310.

[0043] As an optional implementation method, such as Figure 9 and Figure 10 As shown, the paint nozzle 32 includes a spherical mounting portion 321 and a conical spraying portion 322. The outer contour of the spherical mounting portion 321 is spherical, and it is rotatably mounted on the paint hub assembly 3. The spherical mounting portion 321 is provided with a paint inlet hole. The conical spraying portion 322 tapers outward from the spherical mounting portion 321, and its end is provided with a paint spraying hole. The interior of the paint nozzle 32 is provided with a cavity connecting the paint inlet hole and the paint spraying hole.

[0044] The paint nozzle 32 includes a spherical mounting part 321 and a conical spraying part 322. The spherical mounting part 321 is easy to rotate and adjust the angle on the paint spraying hub assembly 3, and the conical spraying part 322 is easy to concentrate the spraying. The internal cavity connects the feed hole and the spraying hole to ensure that the paint is sprayed out smoothly and to constrain the spraying direction.

[0045] The paint spraying hub assembly 3 in this embodiment also includes a nozzle pressure plate 33, which is connected to the outside of the paint spraying hub body 31. The nozzle pressure plate 33 is provided with multiple mounting holes, and a spherical mounting part 321 is movably disposed between the nozzle pressure plate 33 and the paint spraying hub body 31. A conical spraying part extends out of the mounting holes. By limiting the spherical mounting part 321 between the paint spraying hub body 31 and the nozzle pressure plate 33 through the nozzle pressure plate 33, and at the same time allowing the conical spraying part 322 to extend out of the mounting holes, the paint nozzle 32 is fixed while allowing it to move and adjust its angle, which facilitates the adjustment of the spray coverage range of this paint spraying device according to the pulley diameter.

[0046] As an optional implementation method, such as Figure 2 and Figure 3 As shown, the large marine pulley anti-pollution automatic spraying device also includes a support mechanism 7, which is set inside the housing 1 and includes two sets of "Y-shaped" support frames 71 and two sets of support connecting rods 72.

[0047] The two ends of the support rod 72 are respectively threaded, and the two sets of support rods 72 are respectively connected to the two sides of the pulley power main shaft 22. The other end of one set of support rods 72 is connected to the motor output shaft, and the other set of support rods 72 is fixed to the outside of the side push plate 13 by fasteners; the two sets of "Y" type support frames are supported on the bottom of the two sets of support rods respectively.

[0048] In this embodiment, the support rod 72 adopts an adjustable-length support connection, which is composed of two nested round rods of different diameters to facilitate length adjustment according to actual usage needs. The inner ring of the track disk is connected to the support rod 72 via a key shaft.

[0049] As an optional implementation method, such as Figure 11 and Figure 12 As shown, it also includes a waste paint discharge and collection mechanism 8, which comprises a waste paint jet pump suction assembly and a waste paint collection tank. The waste paint jet pump suction assembly includes a U-shaped tube 811 and a venturi tube 812. The U-shaped tube 811 has a waste suction port and a waste discharge port, with the waste suction port communicating with the waste discharge hole on the base plate 11. The venturi tube 812 has a high-pressure air inlet, a negative-pressure suction port, and a mixing outlet. The negative-pressure suction port is connected to the waste discharge port of the U-shaped tube, the high-pressure air inlet is used to receive high-pressure gas, and the mixing outlet is connected to the waste paint collection tank. The waste paint collection tank is used to collect the pumped-out waste paint.

[0050] When in use, high-speed compressed gas enters the venturi tube 812 through the high-pressure inlet, generating negative pressure at the negative pressure suction inlet. This draws the waste paint in the box 1 into the U-shaped tube 811 through the waste discharge hole and the waste suction port, and then discharges it into the waste paint collection bucket through the mixing outlet. When collecting waste paint, no additional power pump is required; simply connecting high-speed compressed gas is enough to suck up and collect excess waste paint from the box 1, effectively preventing waste paint from polluting the environment and construction area.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An automatic anti-pollution spraying device for large marine pulleys, characterized in that, include: The housing, the interior of which forms a painting space; The drive mechanism includes a motor and a pulley power spindle connected to the output shaft of the motor, wherein the pulley to be sprayed is connected to the pulley power spindle; Two sets of paint spraying hub assemblies are connected to the pulley power main shaft and are symmetrically arranged on both sides of the pulley to be painted. Each set of paint spraying hub assemblies includes a paint spraying hub body and multiple paint spray nozzles arranged on the paint spraying hub body. The paint supply mechanism includes a paint spray bar that extends into the paint spray hub assembly for supplying paint to the paint spray nozzle.

2. The automatic anti-pollution spraying device for large marine pulleys according to claim 1, characterized in that, The enclosure includes: A base plate, wherein a waste discharge hole is provided on the base plate, the waste discharge hole being used to discharge waste paint from the box body; Three sets of side plates are fixedly connected to the base plate around its perimeter, forming an accommodating space with an opening on one side; Side push plate, used to close the opening; A top cover plate is placed on top of the side plate and the side push plate.

3. The automatic anti-pollution spraying device for large marine pulleys according to claim 1, characterized in that, A wedge-shaped walker is provided on the lower part of one side of the side push plate, and a sealing structure is provided on the other side. The wedge-shaped walker includes a wedge block, a spring, a spherical caster, and a wheel axle, wherein: The wedge block is fixed to the lower part of the side push plate, and its bottom is provided with a receiving cavity with the opening facing downward. The two side walls of the receiving cavity are provided with shaft grooves. The spring is disposed inside the receiving cavity, with its upper end abutting against the top wall of the receiving cavity and its lower end abutting against the spherical caster; The spherical caster is mounted in the axle groove via the axle, and tends to extend downward out of the receiving cavity under the action of the spring; When the side push plate is lifted, the spherical caster extends under the action of the spring and supports the ground, allowing the side push plate to move back and forth; When the side push plate is lowered, the spherical caster is squeezed back into the receiving cavity, the bottom of the side push plate contacts and positions itself in contact with the ground, and the sealing structure on the other side of the side push plate is squeezed and sealed with the adjacent side plate.

4. An automatic anti-pollution spraying device for large marine pulleys according to any one of claims 1-3, characterized in that, The paint spraying hub body includes: The main body adopts a circular plate structure, with a shaft hole in the center for connecting to the pulley power main shaft, and multiple paint outlet holes are evenly distributed along the periphery of the shaft hole. The edge of the main body is provided with a flange integrally formed with the main body. The track disk includes an outer ring and an inner ring coaxially arranged with the main body. The outer ring is fixedly connected to the flange, and the inner ring is connected to the main body. An annular channel is formed between the outer ring and the inner ring.

5. The automatic anti-pollution spraying device for large marine pulleys according to claim 4, characterized in that, The paint spraying rod includes an inner rod and an outer rod nested together. The inner rod can slide relative to the outer rod to adjust the length of the paint spraying rod. The end of the inner rod is provided with a paint spraying track ball. The paint spraying rod extends into the paint spraying hub body through the annular channel, and the paint spraying track ball abuts against the annular circumferential surface with paint outlet holes, and can slide relative to the annular circumferential surface to close or open the paint outlet holes.

6. The automatic anti-pollution spraying device for large marine pulleys according to claim 5, characterized in that, The paint spraying hub body also includes a washer ring, which is disposed between the body and the paint spraying track ball, and the washer ring has washer ring holes that correspond one-to-one with the paint outlet holes.

7. The automatic anti-pollution spraying device for large marine pulleys according to claim 1, characterized in that, The paint spray nozzle includes a spherical mounting part and a conical spraying part, wherein: The outer contour of the spherical mounting part is spherical, which is used to rotatably mount it on the paint spraying hub assembly, and the spherical mounting part is provided with a paint inlet hole; The conical spray section gradually tapers outward from the spherical mounting section, and its end is provided with a paint spray hole; The inside of the paint nozzle is provided with a cavity that connects the paint feeding hole and the paint spraying hole.

8. The automatic anti-pollution spraying device for large marine pulleys according to claim 7, characterized in that, The paint spraying hub assembly also includes a nozzle pressure plate, which is connected to the outside of the paint spraying hub body. The nozzle pressure plate is provided with a plurality of mounting holes. The spherical mounting part is movably disposed between the nozzle pressure plate and the paint spraying hub body, and the conical spraying part extends out from the mounting holes.

9. The automatic anti-pollution spraying device for large marine pulleys according to claim 1, characterized in that, It also includes a support mechanism, which is disposed inside the housing and includes two sets of "Y-shaped" support frames, two sets of support connecting rods, and two sets of limiting spring clips, wherein: The two ends of the support rod are respectively threaded, and the two sets of support rods are respectively connected to both sides of the pulley power main shaft. The other end of one set of support rods is connected to the motor output shaft, and the other set of support rods is fixed to the outside of the side push plate by fasteners. The two sets of "Y-shaped" support frames are supported one-to-one on the bottom of the two sets of support rods.

10. An automatic anti-pollution spraying device for large marine pulleys according to claim 2, characterized in that, It also includes a waste paint discharge and collection mechanism, which comprises: a waste paint jet pump suction assembly and a waste paint collection tank. The waste paint jet pump suction assembly includes a U-shaped tube and a Venturi tube, wherein: The U-shaped tube has a waste suction port and a waste discharge port, and the waste suction port is connected to the waste discharge hole on the bottom plate; The venturi tube has a high-pressure inlet, a negative-pressure inlet, and a mixing outlet. The negative-pressure inlet is connected to the waste outlet of the U-shaped tube. The high-pressure inlet is used to receive high-pressure gas. The mixing outlet is connected to the waste paint collection bucket. The waste paint collection bucket is used to collect the extracted waste paint.

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