A sucker rod oil scraping and anti-pollution device

Abstract

This invention belongs to the field of oilfield downhole operation technology and discloses a sucker rod oil scraping and anti-pollution device, including: a pre-works flange for sealing and covering the sucker rod; a mounting screw connected to the pre-works flange; and an oil collection tank connected to the pre-works flange via the mounting screw. The oil scraping assembly includes: a mounting plate, a triangular cover, an octagonal elastic scraping disc, elastic strips, a segmented elastic contraction scraping core, and an annular rubber ring. It can effectively absorb and buffer the gas pressure generated during sucker rod movement, smoothly discharge the gas inside the cavity, and prevent crude oil splashing. Simultaneously, the flexible elastic strips achieve large-area oil removal, and the upper segmented elastic contraction scraping core, combined with a dynamic pressing structure, scrapes away residual oil film. This dual protection significantly improves scraping efficiency and sealing performance, solves the problem of oil leakage and pollution, and provides a reliable guarantee for clean production in oilfields.

Description

Technical Field

[0001] This invention belongs to the field of oilfield downhole operation technology, and particularly relates to a sucker rod oil scraping and pollution prevention device. Background Technology

[0002] During pump inspection operations at oil wells, the first step is to remove the sucker rod from the tubing. In order to remove the crude oil adhering to the sucker rod, a conventional oil scraping device is usually installed on the well. A typical oil scraping device consists of a 3-5cm thick annular rubber core fitted onto the sucker rod and installed inside the scraping device cylinder to scrape oil.

[0003] During pump inspection operations at oil wells, since crude oil in the well is usually accompanied by natural gas, when the sucker rod is pulled up, the gas is rapidly released due to pressure at the wellhead, which will "explode" the crude oil and splash it around the wellhead, seriously polluting the wellhead facilities and well workover equipment. Existing ordinary oil scraping devices have a simple structure, no buffer structure in the cavity, cannot release gas, and have poor oiling effect, which cannot effectively prevent pollution. Summary of the Invention

[0004] This invention addresses the problems of existing ordinary oil scraping devices, such as simple structure, lack of buffer structure within the cavity, inability to release gas, poor oil-scraping effect, and inability to effectively prevent contamination. The invention proposes the following technical solution:

[0005] A sucker rod oil scraping and anti-contamination device includes: a flange on the wellhead for sealing and covering the sucker rod;

[0006] Install the top screw and connect it to the flange on the wellhead;

[0007] The oil collection drum is connected to the flange on the wellhead via the mounting screw;

[0008] The oil scraping assembly includes: a mounting plate, a triangular cover, an octagonal squeegee disc, squeegee strips, a segmented elastic retractable scraper core, and an annular rubber ring;

[0009] The triangular cover is fixedly connected to the oil collection bucket via the mounting plate. The triangular cover is fixed to the tendon strip via the octagonal tendon scraper. The tendon strip is symmetrically arranged on the outside of the octagonal tendon scraper. The segmented elastic shrinkable scraper core is connected to the oil collection bucket. The annular rubber ring is connected to the segmented elastic shrinkable scraper core.

[0010] A pressure cap, connected to the oil collection tank, is used to squeeze the segmented elastic shrink scraper core;

[0011] The limiting and pressing assembly is connected to the oil collection tank and is used to limit the sucker rod and press the segmented elastic shrinkable scraper core.

[0012] As a preferred embodiment of the above technical solution, the oil scraping assembly further includes:

[0013] A lead screw is inserted into the mounting plate;

[0014] A nut is connected to the lead screw, and the triangular cover is fixed to the mounting plate by the lead screw and the nut.

[0015] As a preferred embodiment of the above technical solution, the octagonal tendon scraper has symmetrically inclined grooves on all eight sides, the tendon strips are located inside the inclined grooves, and two sets of tendon strips are arranged between opposite faces of the octagonal tendon scraper.

[0016] As a preferred embodiment of the above technical solution, the limiting pressing assembly includes:

[0017] Installation strip, connected to the oil collection tank;

[0018] A round rod, connected to the round rod via the mounting strip;

[0019] A deflection rod is sleeved on the outside of the round rod;

[0020] The pressing strip is connected to the round rod via the deflection rod;

[0021] A roller is connected below the deflection rod;

[0022] An extrusion structure is attached above the pressing strip.

[0023] As a preferred embodiment of the above technical solution, the limiting pressing assembly further includes:

[0024] The support bar is connected to the oil collection tank via the mounting bar;

[0025] A limiting ring is connected to the mounting strip via the support strip;

[0026] An arc-shaped support rod is connected below the limiting ring;

[0027] The support ring is connected to the limiting ring via the arc-shaped support rod;

[0028] An elastic element is connected to the support ring and one end face is attached to the deflection rod.

[0029] As a preferred embodiment of the above technical solution, the extrusion structure includes:

[0030] The linkage arm is connected to the pressing strip;

[0031] A push rod is connected to the linkage arm, and the linkage arm and the linkage arm are used to squeeze the segmented elastic shrink scraper core.

[0032] As a preferred embodiment of the above technical solution, an outlet is provided at the bottom of the outer side of the oil collection tank, an outlet pipe is provided inside the outlet, and a sealing ring is provided at the connection between the outlet pipe and the outlet for discharging objects inside the oil collection tank.

[0033] As a preferred embodiment of the above technical solution, the deflecting rod is S-shaped, the roller has an inclined groove on its outer side, and the distance between the maximum outer diameter of the roller and the vertical line of the center of the oil collection drum is less than the closest distance between the deflecting rod and the vertical line of the center of the oil collection drum.

[0034] The beneficial effects of this invention are as follows:

[0035] (1) It can effectively absorb and buffer the gas pressure generated during the movement of the sucker rod, and smoothly discharge the gas in the cavity, eliminating the phenomenon of crude oil splashing. In addition, the device adopts an upper and lower two-layer oil scraping mechanism: the lower octagonal tendon oil scraping disc achieves large-area oil stain removal through flexible tendon strips, and the upper segmented elastic shrinkage oil scraping core, combined with dynamic pressing structure, scrapes off the residual oil film. The double protection significantly improves the oil scraping efficiency and sealing performance, solves the problem of oil stain leakage and pollution from the root, and provides a reliable guarantee for clean production in oil fields.

[0036] (2) Through the linkage of rollers, deflection rods and pressing structure, the device can respond to changes in the size of the sucker rod in real time, realize the dynamic tight fit between the split elastic shrink scraper core and the sucker rod, and effectively avoid the problem of oil leakage caused by pressure fluctuations or sucker rod deformation. Attached Figure Description

[0037] Figure 1 The diagram shown is a structural schematic of a sucker rod oil scraping and anti-pollution device according to Embodiment 1;

[0038] Figure 2 The diagram shown is a cross-sectional view of a sucker rod oil scraping and anti-contamination device according to Embodiment 1;

[0039] Figure 3 The diagram shown is a schematic of the installation structure of the triangular shield in Embodiment 1;

[0040] Figure 4 The diagram shown is a schematic diagram of the installation structure of the beef tendon strip in Embodiment 1;

[0041] Figure 5 The diagram shown is a schematic diagram of the annular rubber ring in Example 1;

[0042] Figure 6 The diagram shown is a schematic of the installation structure of the arc-shaped support rod in Embodiment 1;

[0043] Figure 7 The diagram shown is a schematic of the installation structure of the annular rubber core in Example 2.

[0044] In the diagram: 1. Flange on the tree trunk; 2. Mounting screw; 3. Oil collection tank; 41. Mounting plate; 42. Screw; 43. Nut; 44. Triangular cover; 45. Octagonal elastic scraper plate; 46. Elastic strip; 5. Split-type elastic contraction scraper core; 51. Annular rubber ring; 6. Pressure cap; 71. Mounting strip; 72. Round rod; 73. Support strip; 74. Limiting ring; 75. Arc-shaped support rod; 76. Support ring; 77. Elastic element; 78. Deflection rod; 79. Pressing strip; 710. Linkage arm; 711. Push rod; 712. Roller; 91. Liquid collection tank; 92. Clamp head; 93. Base; 94. Annular rubber core; 95. Top cover. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Example 1

[0046] This invention provides a sucker rod oil scraping and anti-contamination device, such as... Figures 1 to 6 As shown, the assembly includes: a pre-works tree flange 1, a mounting screw 2, an oil collection tank 3, an oil scraping assembly, a pressure cap 6, and a limiting and pressing assembly. The pre-works tree flange 1 is used to seal and cover the sucker rod; the mounting screw 2 is connected to the pre-works tree flange 1; the oil collection tank 3 is connected to the pre-works tree flange 1 via the mounting screw 2; the oil scraping assembly includes: a mounting plate 41, a triangular cover 44, an octagonal elastic scraper plate 45, an elastic strip 46, a segmented elastic shrinkable scraper core 5, and an annular rubber ring 51; the triangular cover 44 is connected to the oil collection tank 3 via the mounting plate 41. The oil drums 3 are fixedly connected. The triangular cover 44 is fixed to the tendon strip 46 by the octagonal tendon scraper plate 45. The tendon strip 46 is symmetrically arranged on the outside of the octagonal tendon scraper plate 45. The split elastic shrinkable scraper core 5 is connected to the oil collection drum 3. The annular rubber ring 51 is connected to the split elastic shrinkable scraper core 5. The pressure cap 6 is connected to the oil collection drum 3 and is used to squeeze the split elastic shrinkable scraper core 5. The limiting and pressing assembly is connected to the oil collection drum 3 and is used to limit the oil sucker rod and press the split elastic shrinkable scraper core 5.

[0047] Traditional sucker rod scraping devices have a simple structural design and lack an effective gas buffer and release mechanism, which makes it difficult for gas to be discharged from the cavity. This can easily cause crude oil to be "exploded" and splashed out under pressure, resulting in serious pollution of wellhead equipment and well workover facilities. At the same time, the simple scraping structure is difficult to completely remove oil stains from the surface of the sucker rod, which greatly reduces the anti-pollution effect.

[0048] This device successfully overcomes the aforementioned technical bottlenecks through the design of a multi-layered composite structure. The oil scraping assembly and the oil collection tank 3 form an integrated buffer chamber. Combined with the unique elastic deformation characteristics of the internal tendon strips 46 of the octagonal tendon-shaped oil scraping disc 45, it effectively absorbs and buffers the gas pressure generated during sucker rod movement, smoothly expelling the gas from the chamber and preventing crude oil splashing. Furthermore, the device employs a two-layer oil scraping mechanism: the lower octagonal tendon-shaped oil scraping disc 45 achieves large-area oil removal through the tendon strips 46, while the upper segmented elastic contraction oil scraping core 5, combined with a dynamic pressing structure, scrapes away residual oil film. This dual protection significantly improves oil scraping efficiency and sealing performance, fundamentally solving the problem of oil leakage and pollution, and providing a reliable guarantee for clean production in oil fields.

[0049] In use, multiple tendon strips 46 are wound around the octagonal tendon scraper 45 (the quantity is set to 4-8, specifically four in this application, and two tendon strips 46 form a group). Then, the octagonal tendon scraper 45 is fitted into the inside of multiple triangular covers 44. Then, the octagonal tendon scraper 45 and the mounting plate 41 are fixed by the cooperation of the screw 42 and the nut 43. Next, the oil collection tank 3 and the flange 1 on the production tree are fixed by the mounting set screw 2. Then, the segmented elastic shrinkable scraper core 5 and the annular rubber ring 51 are assembled and placed inside the oil collection tank 3. Finally, the pressure cap 6 is screwed on to assemble the device. At this time, the sucker rod passes through the middle of the multiple tendon strips 46 and the segmented elastic shrinkable scraper core 5. When the sucker rod moves, it removes the surface dirt by passing through the multiple tendon strips 46 and the segmented elastic shrinkable scraper core 5.

[0050] Specifically, an oil collection tank 3 is fitted onto the top of the flange 1 on the production tree. An inclined groove is formed on the top of the outer surface of the flange 1. A mounting screw 2 is symmetrically threaded onto the bottom of the outer surface of the oil collection tank 3. An inclined angle is formed on the outer side of the mounting screw 2, and the inclined angle and the inclined groove fit together. A placement groove is formed inside the oil collection tank 3 at the top of the outer surface of the flange 1. Sealing rubber is installed inside the placement groove to increase the seal between the oil collection tank 3 and the flange 1. Simultaneously, because the oil collection tank 3 has a small vertical space, a large central cavity, and a flared lower section that fits against the conical surface of the flange 1, when gas flows in from below, the sudden expansion of the central cavity triggers a pressure relief effect. (The gas flow rate decreases as the cross-sectional area increases, and the pressure is released accordingly), forming a stable pressure reduction buffer process. An outlet is located at the bottom outer side of the oil collection tank 3, and an outlet pipe is installed inside the outlet. A sealing ring is installed at the connection between the outlet pipe and the outlet to increase sealing. The outlet pipe is also used for discharging contents (sludge and water) inside the oil collection tank 3. An installation plate 41 is welded to the inner wall of the oil collection tank 3. A lead screw 42 is connected through the installation plate 41. Nuts 43 are threaded to both the top and bottom ends of the lead screw 42 on its outer surface. The nuts 43 are used to fix the lead screw 42 and prevent its position from shifting. A triangular cover 44 is welded to the bottom end of the lead screw 42. Multiple triangular covers... An octagonal, elastic scraper disc 45 is connected between 44 sections. Elastic strips 46 are wound around the outside of the octagonal, elastic scraper disc 45. Inclined grooves are symmetrically formed on all eight sides of the octagonal, elastic scraper disc 45. The elastic strips 46 are located inside the inclined grooves, serving to limit their movement and prevent displacement. Simultaneously, because multiple sets of elastic strips 46 are in contact with the outside of the sucker rod (the sucker rod passes through the center point of multiple sets of elastic strips 46, causing each set of elastic strips 46 to contact different points on the outside of the sucker rod, ensuring full contact between the outside of the sucker rod and the elastic strips 46), the multiple sets of elastic strips 46 clean the outside of the sucker rod as it moves, thus improving the suction efficiency. The outside of the oil rod is cleaned of objects (oil stains), and the elasticity of multiple sets of reinforcing strips 46 allows the cleaning structure to be adapted to oil rods of different sizes. A split-type elastic shrinkable oil scraper core 5 is snapped into the top of the inner wall of the oil collection tank 3. The bottom of the split-type elastic shrinkable oil scraper core 5 has three dividing grooves, so that the bottom of the split-type elastic shrinkable oil scraper core 5 forms three petals. An annular rubber ring 51 is sleeved in the middle of the outer surface of the split-type elastic shrinkable oil scraper core 5. The annular rubber ring 51 is used for limiting and resetting the outer side of the split-type elastic shrinkable oil scraper core 5. A pressure cap 6 is connected to the top of the outer surface of the oil collection tank 3 by threads. The top of the inner wall of the pressure cap 6 and the top of the split-type elastic shrinkable oil scraper core 5 fit together.

[0051] like Figure 2 and Figure 6The limiting and pressing assembly, as shown, includes: a mounting strip 71, a round rod 72, a support strip 73, a limiting ring 74, an arc-shaped support rod 75, a support ring 76, an elastic element 77, a deflecting rod 78, a pressing strip 79, a linkage arm 710, a push rod 711, and a roller 712; the mounting strip 71 is connected to the oil collection tank 3; the round rod 72 is connected to the round rod 72 via the mounting strip 71; the deflecting rod 78 is sleeved on the outside of the round rod 72; the pressing strip 79 is connected to the round rod 72 via the deflecting rod 78; the roller 712 is connected below the deflecting rod 78; and the extrusion structure is connected to... Above the pressing strip 79; the support strip 73 is connected to the oil collection tank 3 via the mounting strip 71; the limiting ring 74 is connected to the mounting strip 71 via the support strip 73; the arc-shaped support rod 75 is connected below the limiting ring 74; the support ring 76 is connected to the limiting ring 74 via the arc-shaped support rod 75; the elastic element 77 is connected to the support ring 76 and one end face is attached to the deflection rod 78; the linkage arm 710 is connected to the pressing strip 79; the push rod 711 is connected to the linkage arm 710, and the linkage arm 710 and the linkage arm 710 are used to squeeze the segmented elastic shrink scraper core 5.

[0052] During the reciprocating motion of the sucker rod, the oil collection tank 3 generates gas pressure due to the movement of the sucker rod. It relies on the segmented elastic contraction scraper core 5 for passive pressure relief. Although it can discharge the gas in the cavity, when the sucker rod changes size during the extraction process, gaps are easily generated between the segmented elastic contraction scraper core 5 and the sucker rod, leading to gas leakage.

[0053] To address this issue, a pressing structure for the segmented elastic contraction scraper core 5 was designed. By adding an adaptive limiting pressing component, and utilizing the synergistic effect of the roller 712 and the deflection rod 78, when the sucker rod size changes, the limiting pressing component senses the change in rod size. On one hand, the roller 712 contacts the sucker rod, and due to the change in sucker rod size, the roller 712 causes the deflection rod 78 to dynamically adjust the angle of the pressing strip 79, ensuring that the segmented elastic contraction scraper core 5 always adheres to the sucker rod surface. This dynamic adaptive pressing mechanism not only ensures stable gas output but also effectively avoids sealing failure caused by changes in rod size, significantly improving the leak-proof performance of the device under complex operating conditions. On the other hand, the extrusion structure composed of the linkage arm 710 and the push rod 711 responds synchronously, applying pressure to the segmented elastic contraction scraper core 5, making the segmented elastic contraction scraper core 5 more stable during placement.

[0054] In use, the tension of the elastic element 77 drives the deflection rod 78 to deflect outside the round rod 72. At this time, the bottom end of the deflection rod 78 drives the roller 712 to deflect, causing multiple rollers 712 to converge. This causes the pressing strip 79 to separate from the segmented elastic shrinkable oil scraper core 5. At the same time, the linkage arm 710 drives the push rod 711 to press the top of the outer side of the segmented elastic shrinkable oil scraper core 5, so that the segmented elastic shrinkable oil scraper core 5 is pressed and fixed. In the process of the push rod 711 and the segmented elastic shrinkable oil scraper core 5 being attached, the impact force between the push rod 711 driven by the elastic element 77 and the oil collection tank 3 is reduced, thus making the device operate more smoothly.

[0055] When the sucker rod size changes, the roller 712 causes the deflector rod 78 to dynamically adjust the angle of the pressing strip 79. At this time, the pressing strip 79 approaches and adheres to the outside of the segmented elastic contraction scraper core 5. Simultaneously, the linkage arm 710 causes the push rod 711 to descend, reducing the pressure between the push rod 711 and the segmented elastic contraction scraper core 5. Because the pressing strip 79 applies pressure to the outside of the segmented elastic contraction scraper core 5, the inside of the segmented elastic contraction scraper core 5 adheres to the outside of the sucker rod, causing the segmented elastic contraction scraper core 5 to compress. This causes the segmented elastic contraction scraper core 5 to deform. During the deformation process, the segmented elastic contraction scraper core 5 adheres more tightly to the sucker rod, and the internal channels of the segmented elastic contraction scraper core 5 become blocked due to the physical changes generated during the compression process.

[0056] Specifically, multiple mounting strips 71 are symmetrically welded at equal intervals along the inner wall of the oil collection drum 3. Two mounting strips 71 form a group, and three groups are set in total. A round rod 72 is embedded between the opposing faces of two mounting strips 71. Support strips 73 are welded to the back faces of two mounting strips 71. A common limiting ring 74 is welded between the tops of the multiple support strips 73. Four arc-shaped support rods 75 are welded to the bottom of the limiting ring 74. A common support ring 76 is welded between the tops of the four arc-shaped support rods 75. Three elastic elements 77 are embedded at the top of the support ring 76. The elastic elements 77 are supported and fixed by the arc-shaped support rods 75 and the support ring 76. The cross-section of the support ring 76 is triangular. The elastic elements 77 are installed on the inclined surface of the support ring 76, so that the elastic elements 77 are in an inclined state relative to the ground, thus facilitating the contact between the driving end of the elastic elements 77 and the deflection rod 78. A deflection rod 78 is rotatably connected to the outside of the round rod 72. A pressing strip 79 is welded to the top of the deflection rod 78. A linkage arm 710 is hinged to the top of the connecting bar 79, and a push rod 711 is hinged to the top of the linkage arm 710. The outer side of the push rod 711 is in close contact with the inner wall of the oil collection tank 3. A protrusion is welded to the edge of the outer surface of the push rod 711, and the protrusion is slidably connected to the inside of the oil collection tank 3. A groove is provided inside the oil collection tank 3 corresponding to the outer side of the protrusion. The deflection rod 78 is S-shaped, and an inclined groove is provided on the outer side of the roller 712. The distance between the maximum outer diameter of the roller 712 and the vertical line of the center of the oil collection tank 3 is smaller than that of the deflection rod. The closest distance between the bottom end of 78 and the center vertical line of the oil collection tank 3 is to prevent the deflecting rod 78 from contacting the sucker rod when the roller 712 contacts the sucker rod, thus preventing the sucker rod from being unable to move due to the obstruction of the deflecting rod 78. The movable end of the elastic element 77 has a rounded corner, and the movable end of the elastic element 77 is in contact with the side of the deflecting rod 78 that is close to the center vertical line of the oil collection tank 3, which facilitates the deflection of the deflecting rod 78 and reduces the friction between the deflecting rod 78 and the elastic element 77.

[0057] In this application, the elastic element 77 belongs to an elastic linear motion structure, specifically a spring telescopic rod. Example 2

[0058] like Figure 7 As shown, the difference between this scheme and Embodiment 1 lies in the oil collection tank 3 and the oil scraping assembly. The oil scraping assembly includes a base 93, with an annular rubber core 94 snapped into the inside of the base 93. A top cover 95 is threadedly connected to the top of the annular rubber core 94 on the outer surface of the base 93. A liquid collection tank 91 is welded to the outside of the base 93, and the liquid collection tank 91 has a clamp head 92 integrally formed. This method is suitable for sucker rods of the same diameter, and can maintain a stable sealing state for a long time, reduce the risk of wellhead contamination, ensure the safety of the oil production operation environment, and facilitate installation and replacement. Furthermore, the clamp head 92 is directly connected to the flange 1 on the production tree, changing the connection method.

[0059] Working principle: In actual operation, the sucker rod is inserted through the device, with its outer side in contact with the roller 712. When the sucker rod reciprocates inside the device, gas pressure is generated in the oil collection tank 3 due to the movement of the sucker rod. At this time, the segmented elastic contraction scraper core 5 provides passive pressure relief. If the size of the sucker rod changes, the roller 712, due to its contact with the outer side of the sucker rod, will move when the outer size of the sucker rod changes. When the roller 712 moves, it drives the deflection rod 78 to dynamically adjust the angle of the pressing strip 79. When the pressing strip 79 approaches the segmented elastic contraction... The outer side of the scraper core 5 is then adhered. During this process, the pressing strip 79 simultaneously drives the push rod 711 to descend via the linkage arm 710, reducing the squeezing force between it and the segmented elastic contraction scraper core 5. At the same time, the pressing strip 79 applies pressure to the outer side of the segmented elastic contraction scraper core 5, causing the inner side of the segmented elastic contraction scraper core 5 to adhere to the sucker rod. Through compression and deformation, not only is the segmented elastic contraction scraper core 5 more tightly adhered to the sucker rod, but the outer channel of the segmented elastic contraction scraper core 5 is also sealed due to physical compression, effectively preventing gas leakage.

[0060] In addition, the sucker rod passes through the center point of multiple reinforcing bars 46. During the movement, the reinforcing bars 46 first perform preliminary oil cleaning on the outside of the sucker rod. Then, the sucker rod enters the split elastic contraction scraper core 5 to complete secondary deep oil scraping and achieve double-layer purification. When the device is idle, the tension of the elastic element 77 drives the deflection rod 78 to deflect around the round rod 72, which drives the roller 712 to converge. At the same time, the linkage arm 710 pulls the push rod 711 to press down on the top of the outer side of the core, and firmly presses and fixes the split elastic contraction scraper core 5 to ensure that the device is in a safe standby state.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A sucker rod oil scraping and anti-pollution device, characterized in that, include: Flange (1) on the wellhead is used to seal and cover the sucker rod; Install the set screw (2) and connect it to the flange (1) on the tree; The oil collection tank (3) is connected to the flange (1) on the oil production tree via the mounting screw (2); The oil scraping assembly includes: a mounting plate (41), a triangular cover (44), an octagonal rib scraping plate (45), a rib strip (46), a split elastic shrink scraping core (5), and an annular rubber ring (51). The triangular cover (44) is fixedly connected to the oil collection tank (3) through the mounting plate (41). The triangular cover (44) is fixed to the tendon strip (46) through the octagonal tendon scraper plate (45). The tendon strip (46) is symmetrically arranged on the outside of the octagonal tendon scraper plate (45). The segmented elastic shrinkable scraper core (5) is connected to the oil collection tank (3). The annular rubber ring (51) is connected to the segmented elastic shrinkable scraper core (5). The pressure cap (6) is connected to the oil collection tank (3) and is used to squeeze the segmented elastic shrink scraper core (5); The limiting and pressing assembly is connected to the oil collection tank (3) and is used to limit the sucker rod and press the split elastic shrink scraper core (5); The limiting pressing assembly includes: The mounting strip (71) is connected to the oil collection tank (3). A round rod (72) is connected to the round rod (72) by the mounting strip (71); A deflection rod (78) is sleeved on the outside of the round rod (72); The pressing strip (79) is connected to the round rod (72) via the deflection rod (78); A roller (712) is connected below the deflection rod (78); An extrusion structure is attached above the pressing strip (79).

2. The oil scraping and anti-pollution device for sucker rods according to claim 1, characterized in that, The oil scraping assembly also includes: A lead screw (42) is inserted into the mounting plate (41). Nut (43) is connected to the lead screw (42), and the triangular cover (44) is fixed to the mounting plate (41) by the lead screw (42) and the nut (43).

3. The oil scraping and anti-pollution device for sucker rods according to claim 1, characterized in that, The octagonal beef tendon scraper (45) has symmetrically inclined grooves on all eight sides, and the beef tendon strips (46) are located inside the inclined grooves. Two sets of beef tendon strips (46) are arranged between opposite sides of the octagonal beef tendon scraper (45).

4. The oil scraping and anti-pollution device for sucker rods according to claim 1, characterized in that, The limiting pressing assembly further includes: The support bar (73) is connected to the oil collection tank (3) via the mounting bar (71); The limiting ring (74) is connected to the mounting strip (71) via the support strip (73); An arc-shaped support rod (75) is connected below the limiting ring (74); The support ring (76) is connected to the limiting ring (74) via the arc-shaped support rod (75). An elastic element (77) is connected to the support ring (76) and one end face is attached to the deflection rod (78).

5. The oil scraping and anti-pollution device for sucker rods according to claim 1, characterized in that, The extrusion structure includes: Linkage arm (710) is connected to the pressing strip (79). A push rod (711) is connected to the linkage arm (710), and the linkage arm (710) is used to squeeze the segmented elastic shrink scraper core (5).

6. The oil scraping and anti-pollution device for sucker rods according to claim 1, characterized in that, The oil collection tank (3) has an outlet at the bottom outside, and an outlet pipe is provided inside the outlet. A sealing ring is provided at the connection between the outlet pipe and the outlet for discharging objects inside the oil collection tank (3).

7. The oil scraping and anti-pollution device for sucker rods according to claim 1, characterized in that, The deflection rod (78) is S-shaped, and the roller (712) has an inclined groove on its outer side. The distance between the maximum outer diameter of the roller (712) and the vertical line of the center of the oil collection bucket (3) is less than the closest distance between the deflection rod (78) and the vertical line of the center of the oil collection bucket (3).

8. The oil scraping and anti-pollution device for sucker rods according to claim 4, characterized in that, The movable end of the elastic element (77) is provided with a rounded corner, and the movable end of the elastic element (77) is in contact with the side of the deflection rod (78) near the center vertical line of the oil collection tank (3).

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