A continuous coating device and method for sucker rods

Abstract

This invention discloses a continuous sucker rod coating device and method, relating to the field of sucker rod technology. The continuous sucker rod coating device includes: a main mold shell, with a hollow cavity inside for the sucker rod to pass through and an extrusion channel for extruding coating material; a cylinder fixed to one side of the main mold shell, with a negative pressure cylinder inside communicating with the hollow cavity; a fixed sealing port located at the end of the cylinder away from the main mold shell, its inner diameter being sealed to the maximum diameter portion of the sucker rod; and a variable diameter sealing port located on the negative pressure cylinder, its end face abutting the end face of the fixed sealing port. This continuous sucker rod coating device and method achieve truly continuous and automated coating of the entire length of the sucker rod: by setting a variable diameter sealing port (composed of sealing plates) that can dynamically switch between closed and open states, and a sealing plate that can close and open, and in conjunction with a drive mechanism, this device can intelligently adapt to the variable diameter structure of the sucker rod.

Description

Technical Field

[0001] This invention relates to the field of sucker rod technology, specifically to a continuous sucker rod coating device and a sucker rod coating method. Background Technology

[0002] As a key component of the oil production system, sucker rods operate in complex downhole environments for extended periods, making them susceptible to corrosion and wear, which severely impacts their service life and oil production efficiency. To protect them, a corrosion-resistant and wear-resistant outer layer is often applied to the surface of the sucker rod. To achieve green manufacturing and resource recycling, the industry is exploring the use of recycled plastics (such as waste polyethylene) after heat plasticization as the coating material. This not only effectively reduces production costs but also represents an important technological approach to realizing the resource utilization of solid waste. This recycled plastic outer material can be directly applied to the outer surface of the sucker rod through an extrusion head.

[0003] Traditional coating processes often employ segmented coating or separate treatment of the rod body and the thicker ends (such as joints), which results in low efficiency, inconsistent coating at joints, and the formation of weak points, making it difficult to meet the needs of efficient, continuous, and green production based on recycled materials.

[0004] Continuous coating can improve production efficiency and the integrity of the coating layer. However, the large ends of the sucker rod (such as threaded joints) at both ends pose a significant challenge to continuous coating: to ensure that the coating layer fits tightly to the rod, a negative pressure environment usually needs to be established in the die head area. For example, the patent application number CN201610203743.8 proposes a continuous full coating device and coating method for sucker rods. By adopting vacuum adsorption coating technology, it achieves continuous and uniform thickness full coating of sucker rods, simplifying the mold structure and specific coating steps for coating irregularly shaped objects.

[0005] However, this approach, or similar approaches, still face a common challenge when dealing with variable-diameter sucker rods: if the inner diameter of the sealing structure is designed according to the larger end, the seal on the rod body will be poor; if it is designed according to the rod body, the larger end will have difficulty passing through or will cause excessive wear on the seal. In addition, once the sucker rod tip is fully inserted, the opening at the die inlet will also affect the stability of the negative pressure. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a continuous sucker rod coating device and a sucker rod coating method, which solves the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a continuous coating device for sucker rods, comprising a main mold shell, the main mold shell having a hollow cavity through which the sucker rod passes and an extrusion channel for extruding coating material; a cylinder fixed to one side of the main mold shell, the cylinder having a negative pressure cylinder communicating with the hollow cavity; a fixed sealing port located at the end of the cylinder away from the main mold shell, its inner diameter being sealed and adapted to the maximum diameter portion of the sucker rod; a variable diameter sealing port located on the negative pressure cylinder and close to the fixed sealing port, composed of multiple sealing plates that can move radially through a telescopic assembly to form a closed state adapted to the diameter of the sucker rod or a dispersed state adapted to its thicker tail end; an openable and closable sealing plate located on the side of the fixed sealing port away from the cylinder, composed of two symmetrical semicircular plates; and a driving mechanism for controlling the corresponding opening and closing movements of the sealing plates of the variable diameter sealing port and the semicircular plates of the sealing plate according to the travel position of the sucker rod.

[0008] Furthermore, the driving mechanism includes: a rotating ring located inside the cylinder and capable of actively rotating within the cylinder at a required angle; a variable-diameter arc plate installed inside the rotating ring in the area opposite to each telescopic component, the variable-diameter arc plate including a small-diameter section, a variable-diameter section, and a large-diameter section, the rotating ring pushing the telescopic components to different degrees through the variable-diameter arc plate when rotating; and a moving component used to connect the rotating ring and the semi-circular plate, enabling the moving component to control the semi-circular plate to close, the semi-circular plate closing to seal the entire negative pressure cylinder and maintain the sealed state inside the negative pressure cylinder.

[0009] Further, the moving component includes: a force-bearing body for supporting a semi-circular plate; a second cam rotatably mounted on the cylinder via a wheel axle and located on the side of the force-bearing body away from the semi-circular plate, with an auxiliary shaft on one side of the wheel axle rotatably mounted on the cylinder, and gears on both the auxiliary shaft and the wheel axle; a main drive plate fixed to one side of the rotating ring, with a continuous groove structure on the main drive plate, the groove structure including a first inclined rail, an arc-shaped rail, and a second inclined rail; and a transmission body including a slider that slides within the groove structure, enabling the slider to perform linear motion, and the transmission body also includes a conversion structure for converting the linear motion of the slider into the rotational motion of the auxiliary shaft.

[0010] Furthermore, the force-bearing body includes: a guide plate, which is fixed on the cylinder; a pressure rod, one end of which is fixedly connected to the semi-circular plate, and the other end of which passes through the guide plate. A spring is provided between the end of the pressure rod away from the guide plate and the guide plate.

[0011] Furthermore, the telescopic assembly includes: an assembly plate for mounting a sealing sheet; a carrier plate, wherein a pressure head is provided on the side of the carrier plate near the variable diameter arc plate, a telescopic rod is fixed between the carrier plate and the assembly plate, and a spring is provided on one side of the telescopic rod and the negative pressure cylinder.

[0012] Furthermore, it also includes a pushing mechanism, which is located on the side of the cylinder away from the main mold shell. The pushing mechanism includes: a gantry frame; two pushing rollers, one above the other, each pushing roller having a wheel seat that can move vertically on the gantry frame; and a fan-shaped wheel fixed on a wheel axle.

[0013] Furthermore, the outer surface of the rotating ring is provided with teeth on one side, and the cylinder is provided with a main drive gear that meshes with the teeth. The cylinder is also provided with a rack plate II for meshing with the main drive gear. The rack plate II is driven by a cylinder to move along its own axial direction.

[0014] Furthermore, the inner arc surface of the assembly plate near the main mold shell is also provided with a centering component, which is used to center the sucker rod.

[0015] Furthermore, it also includes a conveyor, a cooling chamber, and a pull-out machine, wherein the conveyor, the pushing mechanism, the cylinder, the main mold shell, the cooling chamber, and the pull-out machine are arranged in sequence.

[0016] On the other hand, the present invention also provides a method for covering a sucker rod, comprising the following steps:

[0017] Step 1: Control the variable diameter sealing port to disperse. At this time, the semi-circular plate opens, allowing the thicker end of the sucker rod to pass through the negative pressure cylinder and reach the main mold shell. Then, control the variable diameter sealing port to close and seal the rod part of the sucker rod. At this time, the semi-circular plate is still open, and the negative pressure cylinder is controlled to be in a negative pressure state.

[0018] Step 2: Control the main mold shell to extrude the outer skin. Due to the negative pressure, the outer skin is tightly attached to the outer surface of the sucker rod.

[0019] Step 3: The sucker rod continuously passes through and is covered by the main mold shell until the thick end of the sucker rod reaches the fixed sealing port. The sealing sheet is controlled to disperse so that the thick end of the sucker rod can enter the negative pressure cylinder.

[0020] Step 4: When the thicker end of the sucker rod is fully inside the fixed sealing port, control the semicircular plate to close.

[0021] The present invention has the following beneficial effects:

[0022] (1) The continuous coating device and method for sucker rods achieve truly continuous and automated coating of the entire length of the sucker rod: by setting a variable diameter sealing port (composed of sealing plates) that can switch between closed and dispersed states and a sealing plate that can close and disperse, and linking it with the drive mechanism, this device can intelligently adapt to the variable diameter structure of the sucker rod. When the rod passes through, the variable diameter sealing port closes to form an effective seal, and the sealing plate disperses to allow the rod to enter; when the thick end passes through, the variable diameter sealing port disperses in advance to avoid it, and the sealing plate immediately closes to seal the inlet after the thick end passes through. It also seamlessly connects the process of the sucker rod body and the thick end passing through, overcomes the problem of continuous sealing of variable diameter workpieces, improves the service life of the sealing structure, and thus completes the full coating from one thick end to the other without interruption, ensuring sealing, guaranteeing the efficient recycling of waste plastics, and also meeting the requirements of continuous green production.

[0023] (2) The continuous coating device and method for sucker rods, by sealing the rod body at the variable diameter sealing port and blocking the inlet with a sealing plate, can form and maintain a stable negative pressure environment inside the negative pressure cylinder. This negative pressure can strongly and uniformly adsorb and adhere the molten or semi-fluid outer skin material extruded from the main mold shell to the entire surface of the sucker rod, effectively removing gas and avoiding defects such as blistering, debonding, and uneven thickness of the coating layer, significantly improving the density, adhesion, and overall protective performance of the coating layer.

[0024] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0025] Figure 1 This is an overall diagram of the present invention;

[0026] Figure 2 This is a first-view view of the pushing mechanism and the covering mold head of the present invention;

[0027] Figure 3 For the present invention Figure 2 Second-person perspective;

[0028] Figure 4 This is a first-view view of the covering mold head of the present invention;

[0029] Figure 5 This is a cross-sectional view of the main mold shell and the cylinder of the present invention;

[0030] Figure 6 This is a diagram showing the unsealed side of the cylinder body away from the main mold shell of the present invention;

[0031] Figure 7 For the present invention Figure 6 Another perspective view;

[0032] Figure 8For the present invention Figure 7 Exploded view;

[0033] Figure 9 This is an assembly diagram of the centering component and the telescopic component of the present invention;

[0034] Figure 10 This is an assembly diagram of the rotating ring of the present invention in the main mold shell;

[0035] Figure 11 This is an assembly diagram of the sector wheel and wheel seat of the present invention;

[0036] Figure 12 This is an assembly diagram of the rotating ring and the variable diameter arc plate of the present invention;

[0037] Figure 13 For the present invention Figure 7 Enlarged view of area A;

[0038] Figure 14 This is an exploded view of the moving component of the present invention;

[0039] Figure 15 This is a diagram showing the state of the rod portion of the sucker rod at the push roller, semi-circular plate, fixed sealing port, and sealing sheet of the present invention.

[0040] Figure 16 The diagram shows the state of the sucker rod at the push roller, which is the thick end of the sucker rod, and the semicircular plate, the fixed sealing port, and the sealing sheet.

[0041] Figure 17 The diagram shows the state of the push roller, the semi-circular plate, the fixed sealing port, which is the thick end of the sucker rod, and the sealing plate, which is the rod part of the sucker rod.

[0042] Figure 18 This is a diagram showing the state of the thick end of the sucker rod of the present invention detaching from the push roller and the semi-circular plate, and fully entering the fixed sealing port and the sealing plate.

[0043] Figure 19 middle: Figure 19 (a) in the text refers to the present invention. Figure 15 The diagram shows the state of the upper sector wheel and the upper wheel seat during the current state. Figure 19 (b) in the text refers to the present invention. Figure 15 The diagram showing the state of the upper cam 2 and the pressure rod in the specified state;

[0044] Figure 20 middle: Figure 20 (a) in the text refers to the present invention. Figure 16 and Figure 17 The diagram shows the state of the upper sector wheel and the upper wheel seat during the current state. Figure 20 (b) in the text refers to the present invention. Figure 16 and Figure 17The diagram showing the state of the upper cam 2 and the pressure rod in the specified state;

[0045] Figure 21 middle: Figure 21 (a) in the text refers to the present invention. Figure 18 The diagram shows the state of the upper sector wheel and the upper wheel seat during the current state. Figure 21 (b) in the text refers to the present invention. Figure 18 The state diagram of the upper cam and the pressure rod in the present invention is shown in the figure.

[0046] Figure 22 This is a diagram showing the relative positions of the fixed sealing port and the variable diameter sealing port of the present invention.

[0047] In the diagram, 1. Conveyor; 2. Pushing mechanism; 21. Gantry frame; 22. Pushing roller; 23. Gear 1; 24. Sector wheel; 25. Bearing seat; 26. Wheel seat; 27. Slide seat; 3. Covering die head; 31. Main die shell; 311. Extrusion channel; 312. Hollow cavity; 313. Material port; 32. Cylinder; 321. Convex shell; 322. Limiting ring groove; 323. Negative pressure cylinder; 324. Negative pressure connection port; 4. Moving component; 41. Cam 2; 42. Wheel axle; 43. Auxiliary shaft; 44. Gear 2; 45. Force-bearing main body; 451. Pressure rod; 452. Guide plate; 453. Spring 1; 46. Main drive plate; 461. First inclined rail; 462. Arc rail; 463. Second inclined rail; 47. Transmission body; 471. Guide... 472. Plate; 473. Slider; 474. Rack plate; 475. Gear three; 476. Driven parasol wheel; 477. Driven parasol wheel; 478. Support; 5. Semicircular plate; 61. Main drive gear; 62. Rotating ring; 621. Inner ring; 622. Spoke; 63. Tooth section; 7. Centering assembly; 71. Roller; 72. Carrier rod; 73. Spring four; 74. Force rod; 75. Mounting cylinder; 8. Telescopic assembly; 81. Telescopic rod; 82. Spring two; 83. Carrier plate; 84. Pressure head; 85. Assembly plate; 9. Spring three; 10. Roller drive gear; 11. Cooling chamber; 12. Variable diameter arc plate; 121. Small diameter section; 122. Variable diameter section; 123. Large diameter section; 13. Pull-out machine; 14. Fixed sealing port; 15. Sealing plate. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0050] The following is based on Figures 1-22 This invention describes the continuous coating device and method for sucker rod provided in embodiments of the present invention.

[0051] Please refer to Figure 1 This invention provides a continuous coating device for sucker rods, including a conveyor 1, a pushing mechanism 2, a coating die 3, a cooling chamber 11, and a pull-out machine 13, which are arranged in sequence. The conveyor 1 and the pushing mechanism 2 continuously transport the sucker rod to the inside of the coating die 3, where the outer skin is coated. The coated part is cooled in the cooling chamber 11 and finally pulled out by the pull-out machine 13.

[0052] Combination Figures 2-8 As shown, the aforementioned coating die head 3 includes a main die shell 31 and a cylindrical body 32. The main die shell 31 is mainly used for coating, and the cylindrical body 32 serves as a mechanical cavity. Specifically, the main die shell 31 is provided with a hollow cavity 312, which is used to allow the sucker rod to pass through (since the diameters of the two ends of the sucker rod are relatively large, the diameter of the hollow cavity 312 here should allow the two ends of the sucker rod to pass through). The main die shell 31 is also provided with an extrusion channel 311. The extrusion channel 311 is connected to the extruder through the feed port 313. The extruder feeds the raw material of the outer skin into the extrusion channel 311, and the extrusion channel 311 extrudes the raw material along the movement direction of the sucker rod and coats it on the sucker rod.

[0053] The aforementioned cylinder 32 is located on one side of the main mold shell 31, and is close to the entry side of the sucker rod. Inside the cylinder 32, a negative pressure cylinder 323 is provided, communicating with the hollow cavity 312. The negative pressure cylinder 323 is also connected to the cylinder 32. Preferably, this communication method involves a through hole (e.g., a hole is provided on the wall of the negative pressure cylinder 323) Figure 8 The negative pressure cylinder 323 has through holes on its wall (there can be one or more, preferably multiple), so that the two can be connected. Alternatively, the negative pressure cylinder 323 can be set as a mesh cylinder, and a negative pressure connection port 324 is assembled below the cylinder body 32 to connect to a negative pressure fan. When the negative pressure fan is working, the cylinder body 32 and the hollow cavity 312 can form a negative pressure state, so that the material extruded from the extrusion channel 311 is subjected to negative pressure and tightly adheres to the outer surface of the sucker rod.

[0054] like Figure 4 and Figure 7As shown, in order to ensure a stable negative pressure state in the negative pressure cylinder 323, this embodiment is provided with an openable and closable sealing plate and two sets of sealing ports. These two sets of sealing ports are a fixed sealing port 14 (used to keep the inside of the negative pressure cylinder 323 sealed when the larger diameter parts of the sucker rod enter the negative pressure cylinder 323) and a variable diameter sealing port (used to keep the inside of the negative pressure cylinder 323 sealed when the smaller diameter part of the sucker rod enters the negative pressure cylinder 323). The diameter of the fixed sealing port 14 is larger than that of the variable diameter sealing port, and the variable diameter sealing port is close to the fixed sealing port 14.

[0055] Specifically, the fixed sealing port 14 is fixed on the side of the cylinder 32 away from the main mold shell 31. The fixed sealing port 14 allows the thickest end of the sucker rod to pass through in a sealed state. (Refer to...) Figure 4 .

[0056] Combination Figure 7 and Figure 8 As shown, to prevent the smaller diameter sealing port from blocking the larger diameter ends of the sucker rod from entering the negative pressure cylinder 323, the variable diameter sealing port is designed as a dispersible structure. Specifically, the variable diameter sealing port is composed of multiple sets of sealing plates 15 (the sealing plates 15 are made of rubber). Each sealing plate 15 has an arc-shaped structure and is equipped with a telescopic component 8, which is installed on the negative pressure cylinder 323. The telescopic component 8 extends and retracts radially along the negative pressure cylinder 323, so that the sealing plate 15 can move radially along the negative pressure cylinder 323. When it moves radially outward, the variable diameter sealing port is in a dispersed state, allowing the thicker end of the sucker rod to pass through. When it moves radially inward, the variable diameter sealing port is in a closed state, forming a complete annular sealing ring, thus allowing the sucker rod body to pass through in a sealed state.

[0057] It should be noted that one end of the fixed sealing port 14 is inserted into the negative pressure cylinder 323, as shown in the reference. Figure 22 The sealing plate 15 is tightly attached to the end face of the fixed sealing port 14. When the sealing plate 15 is closed, the gap between the outer periphery of the sealing plate 15 and the negative pressure cylinder 323 is sealed by the fixed sealing port 14. In other words, when the sealing plate 15 is closed, the sealing operation is achieved by the cooperation of the fixed sealing port 14 and the variable diameter sealing port.

[0058] The aforementioned openable and closable sealing plate is mainly used to close after the large-diameter end of the sucker rod is fully inserted into the fixed sealing port 14, thereby completely sealing the side of the negative pressure cylinder 323 away from the hollow cavity 312 in the form of an end seal, thus maintaining a stable negative pressure state inside the negative pressure cylinder 323. The sealing plate is located on the side of the fixed sealing port 14 away from the cylinder 32, and the sealing plate is composed of two symmetrical semicircular plates 5, which allows the sealing plate to close or disperse.

[0059] In addition, a drive mechanism is provided to control the opening and closing movements of the sealing plate 15 of the variable diameter sealing port and the semi-circular plate 5 of the sealing plate according to the travel position of the sucker rod. The position of the sucker rod can be determined manually and the drive mechanism can be controlled by manual operation, or the position of the sucker rod can be detected by a sensor to realize the automated drive action.

[0060] Combination Figures 7-10 As shown, in order to achieve the state of constant negative pressure inside the negative pressure cylinder 323, the drive mechanism includes a rotating ring 62, a variable diameter arc plate 12, and a moving component 4.

[0061] The rotating ring 62 is located inside the cylinder 32 and can actively rotate within the cylinder 32 to the required angle. The variable diameter arc plate 12 is installed inside the rotating ring 62 in the area opposite to each telescopic component 8. The variable diameter arc plate 12 includes a small diameter portion 121, a variable diameter portion 122, and a large diameter portion 123. When the rotating ring 62 rotates, it pushes the telescopic components 8 to different degrees through the variable diameter arc plate 12. Specifically, there are three cases: Case 1: When the telescopic component 8 is opposite to the small diameter portion 121, it pushes the sealing plate 15 to close the variable diameter sealing port; Case 2: When the telescopic component 8 is opposite to the variable diameter portion 122, it gradually stops pushing the sealing plate 15, causing the variable diameter sealing port to disperse; Case 3: When the telescopic component 8 is opposite to the large diameter portion 123, the variable diameter sealing port remains in a dispersed state.

[0062] The movable component 4 is used to connect the rotating ring 62 and the semicircular plate 5. When the rotating ring 62 rotates, it can control the movement of the movable component 4, so that the movable component 4 can control the semicircular plate 5 to close and open.

[0063] It should be noted that when the rotating ring 62 rotates, the diameter-changing sealing port should first be dispersed by the diameter-changing arc plate 12 and the telescopic component 8 to avoid the large-diameter end of the sucker rod being blocked by the diameter-changing sealing port. At this time, although the rotating ring 62 is rotating, the moving component 4 should not move. That is to say, in this state, the semi-circular plate 5 is still in a dispersed state, thereby preventing the semi-circular plate 5 from blocking the thick end from continuously entering the fixed sealing port 14. When the large-diameter end of the entire sucker rod is completely inside the fixed sealing port 14, the rotation of the rotating ring 62 can drive the moving component 4 to move, so that the semi-circular plate 5 closes to seal the entire negative pressure cylinder 323 and maintain the negative pressure state inside the negative pressure cylinder 323. During this process, the diameter-changing sealing port should remain dispersed when the rotating ring 62 is in the position of the telescopic component 8 relative to the large-diameter part 123.

[0064] Preferably, in order to ensure the stable rotation of the rotating ring 62, an inner ring 621 is fixed inside it by spokes 622, and a limiting ring groove 322 adapted to the inner ring 621 is opened on the outer surface of the negative pressure cylinder 323.

[0065] like Figure 9As shown, the telescopic assembly 8 includes an assembly plate 85 and a carrier plate 83. The assembly plate 85 is used to install the sealing sheets 15. The carrier plate 83 is provided with a pressure head 84 on the side near the variable diameter arc plate 12. A telescopic rod 81 is fixed between the carrier plate 83 and the assembly plate 85. A spring 82 is provided on the side of the telescopic rod 81 and the negative pressure cylinder 323. When the pressure head 84 is aligned with the small diameter part 121, the small diameter part 121 is in a state of squeezing the pressure head 84. At this time, the spring 82 is in a compressed state, and the multiple sealing sheets 15 are in a closed state and form an annular sealing ring. When the rotating ring 62 rotates, so that the pressure head 84 is aligned with the variable diameter part 122, the spring 82 gradually rebounds, and the sealing sheets 15 are in a state of gradually dispersing. Conversely, when the pressure head 84 is aligned with the large diameter part 123, the spring 82 maintains the rebound state, and the sealing sheets 15 are in a state of maintained dispersion.

[0066] Combination Figure 2 , Figure 3 and Figure 11 As shown, since the diameters at both ends of the sucker rod are relatively large, in order to enable the end of the sucker rod to pass through the pushing mechanism 2, the pushing mechanism 2 includes a gantry frame 21 and a pushing roller 22. There are two pushing rollers 22, one above the other, and the sucker rod is located between the two pushing rollers 22. When the two pushing rollers 22 rotate, they can push the sucker rod into the interior of the covering mold head 3. Each pushing roller 22 has a wheel seat 26, which can move vertically on the gantry frame 21 to adjust the distance between the two pushing rollers 22, so that the thicker end of the sucker rod can also pass over the pushing roller 22.

[0067] Inside the wheel seat 26, there is also a sector wheel 24. The sector wheel 24 is a sector-shaped wheel structure. The sector wheel 24 is fixed on the wheel axle 42. When it rotates, it can make the two push rollers 22 move closer or further away from each other. Preferably, slide seats 27 are also provided on both sides of the wheel seat 26. The gantry frame 21 is provided with a track for the slide seats 27 to slide. Springs 3 and 9 are provided on the slide seats 27 for resetting the push rollers 22 when the sector wheel 24 does not push the wheel seat 26.

[0068] In addition, the axle 42 here is mounted on the gantry 21 via the bearing housing 25.

[0069] It should be noted that, as Figure 2 and Figure 11 As shown, a gear 23 is also provided on the central shaft of the push roller 22, and a roller shaft drive gear 10 should also be installed on the gantry 21. The roller shaft drive gear 10 is driven by a motor. The gear 23 has two states: meshing with the roller shaft drive gear 10 and not meshing. When the two push rollers 22 are in the default closed position under the action of the spring 9, the gear 23 meshes with the roller shaft drive gear 10; when the push rollers 22 are pushed open by the fan wheel 24, the gear 23 disengages from the roller shaft drive gear 10.

[0070] Combination Figure 8 , Figure 10 as well as Figures 12-14 As shown, in order to enable the moving component 4 to control the lifting and lowering of the semicircular plate 5, it includes a force-bearing body 45, a second cam 41, a main drive plate 46, and a transmission body 47. The force-bearing body 45 is used to support the semicircular plate 5. The second cam 41 is rotatably mounted on the cylinder 32 through the wheel axle 42 and is located on the side of the force-bearing body 45 away from the semicircular plate 5. When the second cam 41 rotates, it can push the force-bearing body 45 to different degrees, so that the force-bearing body 45 can push the semicircular plate 5 to rise or fall, thereby realizing the dispersal and closure of the semicircular plate 5.

[0071] Combination Figure 8 , Figure 13 and Figure 14 As shown, to achieve the rotation of cam 41, an auxiliary shaft 43 is provided on one side of the wheel axle 42. The auxiliary shaft 43 is rotatably mounted on the cylinder 32. Both the auxiliary shaft 43 and the wheel axle 42 are provided with gears 44, which mesh with each other. The main drive plate 46 is fixed on one side of the rotating ring 62. The main drive plate 46 is a fan-shaped plate structure with a continuous groove structure. The groove structure includes a first inclined rail 461, an arc-shaped rail 462, and a second inclined rail 463. The transmission body 47 includes a slider 472, which slides within the groove structure. When the main drive plate 46 rotates, the main drive plate 46 rotates. When the drive plate 46 rotates with the rotating ring 62, the slider 472 can pass through the first inclined rail 461, the arc rail 462 and the second inclined rail 463 in sequence. When the slider 472 slides in the first inclined rail 461 and the second inclined rail 463, the slider 472 can make vertical linear motion. When the slider 472 slides in the arc rail 462, it does not make vertical linear motion. In addition, the transmission body 47 also includes a conversion structure for converting the linear motion of the slider 472 into the rotational operation of the auxiliary shaft 43, so as to realize the purpose of the auxiliary shaft 43 driving the wheel shaft 42 to rotate.

[0072] like Figure 14 As shown, the aforementioned force-bearing body 45 includes a guide plate 452 and a pressure rod 451. The guide plate 452 is fixed on the cylinder 32. One end of the pressure rod 451 is fixed to the semicircular plate 5, and the other end passes through the guide plate 452. A spring 453 is provided between the end of the pressure rod 451 away from the guide plate 452 and the guide plate 452. When the end of the cam 41 with a smaller diameter faces the pressure rod 451, its pressure on the pressure rod 451 is smaller, and with the contraction effect of the spring 453, the two semicircular plates 5 will move away from each other. Conversely, when the end of the cam 41 with a larger diameter faces the pressure rod 451, its pressure on the pressure rod 451 is larger, and it stretches the spring 453, causing the two semicircular plates 5 to move closer to each other.

[0073] In addition, continue to refer to Figure 14The aforementioned conversion structure includes a rack plate 473, on one side of which a gear 474 meshes. The gear 474 is mounted inside the cylinder 32 via a support 477, and a driven parachute wheel 475 is coaxial with the gear 474. A driving parachute wheel 476 meshes with the driven parachute wheel 475 on one side of the driven parachute wheel 475, which is fixed on the auxiliary shaft 43. When the slider 472 slides within the first inclined rail 461 and the second inclined rail 463, the rack plate 473 can generate vertical linear motion to control the rotation of the gear 474, thereby achieving the rotation of the auxiliary shaft 43.

[0074] Preferably, a guide plate 471 is also installed inside the cylinder 32 to guide the vertical movement of the rack plate 473.

[0075] It should be noted that when the slider 472 is initially located inside the arc-shaped rail 462, the side of the cam 41 with the smaller diameter faces the force-bearing body 45.

[0076] To achieve the rotation of the rotating ring 62, a toothed portion 63 is provided on one side of the outer surface of the rotating ring 62. A main drive gear 61 that meshes with the toothed portion 63 is provided on the cylinder 32. A rack plate II (not shown in the figure) that meshes with the main drive gear 61 is also provided inside the cylinder 32. The rack plate II is driven by a cylinder to move along its own axis, thereby achieving the rotation of the rotating ring 62. The cylinder's movement is controlled by a controller to control its three-stage movement (the specific reasons will be explained below). The rack plate II, the cylinder, and the main drive gear 61 are all assembled on the convex shell 321, which is integrally formed with the cylinder 32.

[0077] Combination Figure 5 , Figure 6 and Figure 9 As shown, a centering component 7 is also provided on the inner arc surface of the carrier plate 83 near the main mold shell 31. The centering component 7 is used to center the sucker rod. The centering component 7 includes a mounting cylinder 75, which is fixed radially on the negative pressure cylinder 323 and close to the area near the main mold shell 31. A carrier rod 72 is inserted inside the mounting cylinder 75. The other end of the carrier rod 72 is located inside the negative pressure cylinder 323 and is equipped with a roller 71. A spring 73 is provided at the other end of the carrier rod 72 and equipped with a spring seat. A force-applying rod 74 is fixed at the end of the carrier plate 83 near the main mold shell 31. Thus, when the sealing plate 15 is closed, multiple rollers 71 move towards the center synchronously to support the rod part of the sucker rod and stabilize it in the central area of ​​the negative pressure cylinder 323. Conversely, when the sealing plate 15 is dispersed, multiple rollers 71 move towards the distal position to avoid blocking the sucker rod from passing through the negative pressure cylinder 323.

[0078] Taking six sealing plates 15 as an example, there are a total of six variable diameter arc plates 12. The central angle corresponding to each variable diameter arc plate 12 is 60°. Subtracting the space occupied by the carrier plate 83 itself, assuming that the maximum rotation angle of the rotating ring 62 is 50°, the central angle of the small diameter part 121 is 20°, the angle occupied by the variable diameter part 122 is 10°, and the central angle of the large diameter part 123 is 20°, the movement of the sucker rod and the action process of each component should be as follows:

[0079] 1), reference Figure 15 and Figure 19 As shown, the sucker rod gradually moves. At this time, the push roller 22, the semi-circular plate 5, the fixed sealing port 14, and the sealing plate 15 are all rod parts. The slider 472 is located inside the first inclined rail 461, and the sector wheel 24 is as follows. Figure 19 In (a), the push roller 22 is not pushed, and the push roller 22 is in the normal feeding state. Cam 2 41 is as follows: Figure 19 In (b), no pressure is applied to the semicircular plate 5, and the semicircular plate 5 is in a dispersed state. The telescopic component 8 is aligned with the small diameter portion 121, so that the sealing plate 15 is in a closed state. (Refer to...) Figure 15 ;

[0080] In summary, the state is as follows: the push roller 22 is closed, the semi-circular plate 5 is dispersed, and the sealing plate 15 is closed.

[0081] 2) For example Figure 16 and Figure 20 As shown, the sucker rod gradually moves, and its thicker end gradually approaches the push roller 22. At this time, the cylinder extends by the first length, which can control the rotating ring 62 to rotate by the first angle of 20° (when rotating by this angle, the small diameter part 121 is still aligned with the telescopic assembly 8, so the telescopic assembly 8 does not move, and the sealing plate 15 remains closed). This rotation can drive the main drive plate 46 to rotate, so the first inclined rail 461 on the main drive plate 46 can push the rack plate 473 to form a vertical movement through the slider 472. This vertical movement can drive the gear 3 474 to rotate, thereby driving the auxiliary shaft 43 to rotate 90° through the active parachute wheel 476 and the driven parachute wheel 475. When it rotates 90°, the wheel axle 42 can drive the sector wheel 24 and the cam 2 41 to rotate 90°, forming Figure 20 (a) and Figure 20 In state (b), the sector wheel 24 can push the push roller 22, causing the two push rollers 22 to open, so that the push rollers 22 no longer obstruct the passage of the short and thick sucker rod, and... Figure 19 (b) in Figure 20 During process (b), although cam 41 is also rotating, its contact radius with the force-bearing body 45 remains unchanged. Therefore, the force-bearing body 45 will not exert pressure on the semicircular plate 5, thus maintaining the open state of the semicircular plate 5. (Refer to...) Figure 16 ;

[0082] In summary, the state is as follows: the push roller 22 is open, the semi-circular plate 5 is dispersed, and the sealing plate 15 remains closed.

[0083] 3) The sucker rod continues to move, such as Figure 17 As shown, the thicker end of the sucker rod passes between the two semicircular plates 5 and enters the fixed sealing port 14. However, before the sucker rod reaches the position of the sealing plate 15, the cylinder extends a second length. This length can control the rotating ring 62 to continuously rotate a second angle of 10° (this angle is equal to the central angle of the variable diameter section 122). Thus, when rotating this angle, the telescopic component 8 begins to face the variable diameter section 122, so that the telescopic component 8 is no longer squeezed by the small diameter section 121. As a result, the sealing plate 15 begins to disperse, preventing the sealing plate 15 from blocking the thicker end of the sucker rod from entering. In addition, when the rotating ring 62 rotates a second angle of 10°, although the main drive plate 46 rotates synchronously, the slider 472 slides in the arc-shaped rail 462, so the rack plate 473 does not move, and consequently the sector wheel 24 and the second cam 41 also do not move. At this stage, the sector wheel 24 and the second cam 41 are still 20(a) and Figure 20 In state (b), the push roller 22 remains open and the semicircular plate 5 remains dispersed so that the end portion of the thick end of the sucker rod can enter the interior of the fixed sealing port 14.

[0084] In summary, the state is as follows: the push roller 22 opens, the semi-circular plate 5 disperses, and the sealing sheet 15 maintains dispersion.

[0085] 4) For example Figure 18 As shown, the sucker rod gradually moves, and its thicker end has completely entered the fixed sealing port 14. At this time, the control cylinder extends a third length to control the rotating ring 62 to rotate a third angle of 20°. Since the telescopic component 8 has reached the large diameter section 123, the large diameter section 123 maintains a state of not applying pressure to the telescopic component 8, thereby maintaining the dispersed state of the sealing sheet 15. At the same time, during the rotation of the rotating ring 62, the slider 472 slides in the second inclined rail 463, so the rack plate 473 continues to move, and then the sector wheel 24 and the cam 41 rotate again by 90°, forming Figure 21 (a) and Figure 21 In state (b), the sector wheel 24 keeps the pusher roller 22 open, and the cam 41 applies pressure to the semicircular plate 5 through the force-bearing body 45, thereby closing the semicircular plate 5. (Refer to...) Figure 18 At this time, the negative pressure cylinder 323 is able to maintain negative pressure completely;

[0086] In summary, the state is as follows: the push roller 22 is open, the semi-circular plate 5 is closed, and the sealing sheet 15 is dispersed.

[0087] It should be noted that when the semicircular plate 5 is closed, the end of the sucker rod that initially enters the covering die head 3 has already completely passed through the cooling chamber 11 and is continuously pulled by the puller 13, so the push roller 22 does not need to be pushed to open.

[0088] The above describes the movement of the sucker rod from its rod end to its thicker end. The initial feeding step for the thicker end of the sucker rod is as follows: with the push roller 22 open, the semi-circular plate 5 dispersed, and the sealing plate 15 dispersed (i.e., the push roller 22 open, the semi-circular plate 5 dispersed, and the sealing plate 15...), the process is as follows: Figure 17 In the state shown, the sucker rod is passed sequentially through the push roller 22, the semi-circular plate 5, the fixed sealing port 14, and the dispersed sealing plate 15 near its thicker end, until the thicker end of the sucker rod reaches the discharge end of the main mold shell 31. At this point, the control cylinder shortens the first and second lengths mentioned above, so that the entire device forms a shape with the sucker rod. Figure 15 As shown in the diagram, the machine can be started at this point (first turn on the extruder, and after the outer skin is extruded, turn on the roller drive gear 10 of the push roller 22 to make the entire sucker rod start moving) for the coating operation.

[0089] On the other hand, the present invention also provides a method for continuous coating of sucker rod, comprising the following steps:

[0090] Step 1: Control the variable diameter sealing port to disperse. At this time, the semi-circular plate 5 opens, and the thick end of the sucker rod passes through the negative pressure cylinder 323 and reaches the main mold shell 31. Then control the variable diameter sealing port to close and seal the rod part of the sucker rod. At this time, the semi-circular plate 5 is still open, and the negative pressure cylinder 323 is controlled to be in a negative pressure state.

[0091] Step 2: Control the main mold shell 31 to extrude the outer skin. Due to the negative pressure, the outer skin is tightly attached to the outer surface of the sucker rod.

[0092] Step 3: The sucker rod continuously passes through the covering die head 3 and is covered until the thick end of the sucker rod reaches the fixed sealing port 14. The sealing sheet 15 is controlled to disperse so that the thick end of the sucker rod can enter the negative pressure cylinder 323.

[0093] Step 4: When the thicker end of the sucker rod is fully inserted into the fixed sealing port 14, control the semicircular plate 5 to close.

Claims

1. A continuous coating device for sucker rods, characterized in that, include: The main mold shell (31) has a hollow cavity (312) for the sucker rod to pass through and an extrusion channel (311) for extruding the coating material. The cylinder (32) is fixed to one side of the main mold shell (31), and the cylinder (32) is provided with a negative pressure cylinder (323) that communicates with the hollow cavity (312). A fixed sealing port (14) is provided at the end of the cylinder (32) away from the main mold shell (31), and its inner diameter is sealed and adapted to the maximum diameter part of the sucker rod; The variable diameter sealing port is located on the negative pressure cylinder (323) and close to the fixed sealing port (14). It consists of multiple sealing plates (15) that can move radially through the telescopic assembly (8). It can form a closed state that adapts to the diameter of the sucker rod or a dispersed state that adapts to the thick end of its tail. The sealing plate that can be opened and closed is located on the side of the fixed sealing port (14) away from the cylinder (32) and is composed of two symmetrical semicircular plates (5); A drive mechanism is used to control the corresponding opening and closing movements of the sealing plate (15) of the variable diameter sealing port and the semi-circular plate (5) of the sealing plate according to the travel position of the sucker rod. The drive mechanism includes: Rotating ring (62), the rotating ring (62) is located inside the cylinder (32) and can actively rotate within the cylinder (32) to the required angle; A variable diameter arc plate (12) is installed in the area of ​​the rotating ring (62) opposite to each telescopic component (8). The variable diameter arc plate (12) includes a small diameter part (121), a variable diameter part (122) and a large diameter part (123). When the rotating ring (62) rotates, it pushes the telescopic components (8) to different degrees through the variable diameter arc plate (12). The moving component (4) is used to connect the rotating ring (62) and the semicircular plate (5), the moving component (4) comprising: The load-bearing body (45) is used to support the semi-circular plate (5); Cam 2 (41) is rotatably mounted on cylinder (32) via axle (42) and located on the side of the force-bearing body (45) away from the semicircular plate (5). An auxiliary shaft (43) is provided on one side of axle (42). The auxiliary shaft (43) is rotatably mounted on cylinder (32). Gear 2 (44) is provided on both the auxiliary shaft (43) and axle (42). The main drive plate (46) is fixed on one side of the rotating ring (62). The main drive plate (46) has a continuous groove structure, which includes a first inclined rail (461), an arc rail (462), and a second inclined rail (463). The transmission body (47) includes a slider (472) that slides within a groove structure, enabling the slider (472) to perform linear motion. The transmission body (47) also includes a conversion structure for converting the linear motion of the slider (472) into the rotational motion of the auxiliary shaft (43). The force-bearing body (45) includes: Guide plate (452), the guide plate (452) is fixed on the cylinder (32); A pressure rod (451) is fixed at one end to a semicircular plate (5) and the other end passes through a guide plate (452). A spring (453) is provided between the end of the pressure rod (451) away from the guide plate (452) and the guide plate (452).

2. The continuous coating device for sucker rod according to claim 1, characterized in that, The telescopic component (8) includes: Assembly plate (85), said assembly plate (85) is used to install sealing sheet (15); The carrier plate (83) has a pressure head (84) on the side of the carrier plate (83) near the variable diameter arc plate (12). A telescopic rod (81) is fixed between the carrier plate (83) and the assembly plate (85). A spring (82) is provided on one side of the telescopic rod (81) and the negative pressure cylinder (323).

3. A continuous coating device for sucker rods according to claim 1 or 2, characterized in that, It also includes a pushing mechanism (2), which is located on the side of the cylinder (32) away from the main mold shell (31), and the pushing mechanism (2) includes: Gantry frame (21); The pusher roller (22) has two rollers, one above the other, and each pusher roller (22) has a wheel seat (26) which can move vertically on the gantry frame (21). A sector wheel (24) is fixed on a wheel axle (42).

4. The continuous coating device for sucker rod according to claim 1, characterized in that, The outer surface of the rotating ring (62) is provided with a tooth (63) on one side, and the cylinder (32) is provided with a main drive gear (61) that meshes with the tooth (63). The cylinder (32) is also provided with a rack plate II for meshing with the main drive gear (61). The rack plate II is driven by a cylinder to move along its own axis.

5. The continuous coating device for sucker rod according to claim 2, characterized in that, The assembly plate (85) is also provided with a centering component (7) on the inner arc surface of one end near the main mold shell (31), and the centering component (7) is used to center the sucker rod; The centering component (7) includes a mounting cylinder (75), which is fixed radially to the negative pressure cylinder (323) and close to the area of ​​the main mold shell (31). A carrier rod (72) is inserted inside the mounting cylinder (75), and the other end of the carrier rod (72) is located inside the negative pressure cylinder (323) and is equipped with a roller (71). A spring (73) is provided at the other end of the carrier rod (72). A force-applying rod (74) is fixed at one end of the carrier plate (83) close to the main mold shell (31).

6. The continuous coating device for sucker rod according to claim 3, characterized in that, It also includes a conveyor (1), a cooling chamber (11) and a puller (13), wherein the conveyor (1), the pushing mechanism (2), the cylinder (32), the main mold shell (31), the cooling chamber (11) and the puller (13) are arranged in sequence.

7. A method for coating a sucker rod, applicable to the continuous coating device for sucker rods as described in claim 6, characterized in that, Includes the following steps: Step 1: Control the variable diameter sealing port to disperse. At this time, the semicircular plate (5) opens and the thick end of the sucker rod passes through the negative pressure cylinder (323) and reaches the main mold shell (31). Then control the variable diameter sealing port to close and seal the rod part of the sucker rod. At this time, the semicircular plate (5) is still open and the negative pressure cylinder (323) is controlled to be in a negative pressure state. Step 2: Control the main mold shell (31) to extrude the outer skin. Due to the negative pressure, the outer skin is tightly attached to the outer surface of the sucker rod. Step 3: The sucker rod continuously passes through the main mold shell (31) and is covered until the thick end of the sucker rod reaches the fixed sealing port (14). The sealing plate (15) is controlled to disperse so that the thick end of the sucker rod can enter the negative pressure cylinder (323). Step 4: When the thick end of the sucker rod is fully inside the fixed sealing port (14), control the semicircular plate (5) to close.

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