A crank pin anti-falling device for a pumping unit

Abstract

The present application relates to pumping unit technical field, disclose a kind of for pumping unit's crank pin anti-falling device, comprising: bearing, bearing is connected to one side of crank pin;Anti-falling pad, anti-falling pad is threadedly connected to the other side of crank pin;Locking plate, locking plate is threadedly connected on the crank pin and located the outside of anti-falling pad, locking plate is connected with elastic pressure rod between anti-falling pad;Drop early-warning unit, drop early-warning unit includes pressure sensor and alarm, pressure sensor is used to detect the pressure that anti-falling pad is subjected to crank, controller is started alarm according to pressure detection result Warning.The present application adopts double locking mode, and the crank pin is locked;Under the elastic force of elastic pressure rod, increase the friction of threaded connection, not prone to displacement;Elastic pressure rod improves the anti-vibration performance of crank pin connector, reduces the possibility of loosening;Based on pressure detection value, early warning is carried out to drop, can promptly find loosening trend, early warning is more timely, and safety is higher.

Description

Technical Field

[0001] This invention relates to the field of oil pumping unit technology, and more specifically, to a crank pin anti-detachment device for an oil pumping unit. Background Technology

[0002] Oil pumping units are one of the core pieces of equipment in the oil extraction industry, and their stability and reliability directly affect the production efficiency and safety of oil fields. In beam pumping units (commonly known as "nodding donkeys"), the crank-connecting rod mechanism is the key transmission component that converts the rotary motion of the electric motor into the reciprocating motion of the pumping head. As the core connecting component between the crank and the connecting rod, the crank pin is subjected to alternating loads, impact loads, and vibrations in complex environments over a long period of time. Its fixing reliability is directly related to the operational safety of the pumping unit. Once the crank pin loosens or falls off, it can lead to failure of the connecting rod mechanism and shutdown of the pumping unit, or even cause crank imbalance, equipment damage, or even personal injury accidents, posing a significant threat to the safety of oil field production.

[0003] In the prior art, such as the utility model patent with publication number CN215980333U, a safe and stable double-anti crank pin assembly for use in oil pumping units is disclosed. It includes a bearing, a crank pin fixedly connected to the left side of the bearing, a threaded section on the circumferential side of the crank pin away from the bearing, and a nut for threaded engagement at the threaded section on the circumferential side of the crank pin. The nut has hemispherical inner grooves equidistantly on the side near the bearing. A hemispherical protrusion is attached to the inner wall of the hemispherical inner groove. An annular washer is fixedly connected to the side of the hemispherical protrusion near the bearing. An anti-disengagement device is provided at the left end of the inside of the crank pin. Warning devices are provided at equal intervals on the circumferential side of the nut.

[0004] This device monitors the displacement of equipment structural components, facilitating maintenance personnel's assessment of the equipment's operational status. However, in actual use, by the time displacement is detected, the crank pin has already loosened, and the crank structure is already in an unstable state, rendering it ineffective as a warning system.

[0005] Therefore, it is necessary to propose a crank pin anti-dislodgement device for oil pumping units to at least partially solve the problems existing in the prior art. Summary of the Invention

[0006] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0007] To at least partially solve the above problems, the present invention provides a crank pin anti-dislodgement device for an oil pumping unit, comprising:

[0008] The bearing is connected to one side of the crank pin;

[0009] Anti-slip pad, the anti-slip pad is threaded to the other side of the crank pin;

[0010] A locking plate is threaded onto the crank pin and located outside the anti-slip pad. An elastic pressure rod connects the locking plate and the anti-slip pad.

[0011] The detachment warning unit includes a pressure sensor and an alarm. The pressure sensor is used to detect the pressure on the anti-detachment pad from the crank, and the controller activates the alarm based on the pressure detection result.

[0012] Preferably, the anti-detachment pad includes: a first plate and a second plate, the first plate and the second plate are provided with a first threaded hole at their center, the crank pin is provided with a corresponding first threaded area, the side of the first plate away from the bearing is provided with multiple arc-shaped grooves, one end of the elastic pressure rod is pressed into the arc-shaped groove, and the second plate is provided with an arc-shaped protrusion that contacts the side of the crank.

[0013] Preferably, the locking plate has a second threaded hole at its center, the crank pin has a corresponding second threaded area, the other end of the elastic pressure rod is connected to the locking plate, and multiple elastic pressure rods are evenly arranged along the circumference of the locking plate.

[0014] Preferably, the locking plate further includes: a locking groove, a locking rod, and a locking ring. Multiple locking grooves are evenly arranged along the circumference of the locking plate, and the center line of the locking groove in the length direction passes through the center of the locking plate. The locking rod is slidably connected in the locking groove, and the end of the locking rod near the bearing passes through the anti-loosening pad. The locking ring is arranged around the other end of the locking rod and is elastic.

[0015] Preferably, the inner side of the locking ring is provided with multiple support rods, and the ends of the support rods are connected to multiple locking blocks. The locking blocks are set as arc-shaped blocks, and the crank pin is provided with a corresponding annular groove.

[0016] Preferably, the locking rod extends into the first plate body, and the edges of both the first plate body and the second plate body are provided with limiting grooves, and multiple limiting grooves are evenly arranged along the circumferential direction; in the initial position, the locking rod is located outside the limiting groove and corresponds to the opening of the limiting groove.

[0017] Preferably, when the detected pressure sensor reaches a preset value, the locking rod extends into the second plate without protruding from the second plate.

[0018] Preferably, the locking rod is provided with a telescopic frame, which includes multiple telescopic arms, and each telescopic arm is connected to the end of each locking rod. A pin is connected to the center of the telescopic frame, and a hole is provided at the end of the crank pin, into which the pin is inserted.

[0019] Preferably, an electromagnetic block is provided inside the pin, and the electromagnetic block is electrically connected to the controller; the locking ring is hollow and has multiple magnetic areas inside, with iron powder distributed in the magnetic areas, and the electromagnetic block attracts the magnetic areas when energized.

[0020] Preferably, the corners of the locking ring are wrapped around the locking rod, the locking ring forms a convex area at the corners, and the locking rings between adjacent corners form a concave area; the magnetic area is disposed in the convex and concave areas of the locking ring.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] This invention provides a crank pin anti-dislodgement device for oil pumping units, which employs a double-locking method to secure the crank pin. Under the elastic force of the elastic pressure rod, the friction of the threaded connection is increased, making the anti-dislodgement pad less prone to displacement. Even if a small displacement occurs, it can be reset to prevent further dislodgement. At the same time, the elastic pressure rod improves the vibration resistance of the crank pin connection, reducing the possibility of loosening. Based on pressure detection values, a warning is issued for dislodgement, which can detect loosening trends in real time. Compared with displacement detection methods, the warning is more timely and safer.

[0023] The present invention provides a crank pin anti-detachment device for an oil pumping unit. Other advantages, objectives and features of the present invention will be apparent in part from the following description, and in part from the understanding of those skilled in the art through study and practice of the invention. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a schematic diagram of the bearing and crank pin connection structure in this invention;

[0026] Figure 2 This is a schematic diagram of the crank pin anti-detachment device in this invention;

[0027] Figure 3 This is a schematic diagram of the anti-detachment pad in the present invention;

[0028] Figure 4 This is a schematic diagram of the side structure of the locking plate in this invention;

[0029] Figure 5 This is a schematic diagram of the installation structure of the locking ring on the locking plate in this invention;

[0030] Figure 6 This is a schematic cross-sectional view of the locking ring in this invention.

[0031] In the diagram: 1. Bearing; 2. Crank pin; 3. Anti-detachment pad; 4. Locking plate; 5. Elastic pressure rod; 11. First plate; 12. Second plate; 13. First threaded hole; 14. Arc-shaped protrusion; 15. Locking groove; 16. Locking rod; 17. Locking ring; 18. Second threaded hole; 19. Support rod; 21. Locking block; 22. Annular groove; 23. Limiting groove; 27. Telescopic frame; 28. Telescopic arm; 29. ​​Pin; 31. Insertion hole; 33. Magnetic area. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0033] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0034] Example 1:

[0035] like Figures 1-6 As shown, the present invention provides a crank pin anti-dislodgement device for an oil pumping unit, comprising:

[0036] Bearing 1 is connected to one side of crank pin 2;

[0037] Anti-detachment pad 3 is threaded to the other side of crank pin 2;

[0038] Locking plate 4 is threadedly connected to crank pin 2 and located outside anti-disengagement pad 3. An elastic pressure rod 5 is connected between locking plate 4 and anti-disengagement pad 3.

[0039] The detachment warning unit includes a pressure sensor and an alarm. The pressure sensor is used to detect the pressure on the anti-detachment pad 3 from the crank, and the controller activates the alarm based on the pressure detection result.

[0040] The working principle and beneficial effects of the above technical solution are as follows:

[0041] This invention provides a crank pin anti-detachment device for an oil pumping unit, employing a combined structure of an anti-detachment washer 3 and a locking plate 4. During installation of the crank pin 2 with the crank, the crank pin 2 is passed through a through hole on the crank, with one side of the crank fitting against the bearing 1. Then, the anti-detachment washer 3 is installed on the other side, fitted onto the crank pin 2 and screwed in, ensuring the anti-detachment washer 3 fits against the other side of the crank. Next, the locking plate 4 is installed, fitted onto the crank pin 2 and screwed in. The anti-detachment washer 3 is located outside the locking plate 4. Multiple elastic pressure rods 5 on the crank are compressed and abut against the anti-slip pad 3, keeping the anti-slip pad 3 in contact with the crank. When the pressure of the crank pressing on the anti-slip pad 3 is too great, the anti-slip pad 3 tends to move, and the locking plate 4 also tends to move under the action of elasticity, making it possible for the crank pin to fall off. The pressure sensor installed on the anti-slip pad 3 detects the real-time pressure it receives. When the pressure value exceeds the preset value, it indicates that the crank pin may fall off, and the alarm is activated to remind the staff to carry out maintenance.

[0042] Through the above structural design, the crank pin 2 is locked in a double-locking manner. Under the elastic force of the elastic pressure rod 5, the friction of the threaded connection is increased, making it difficult for the anti-loosening pad 3 to shift. Even if a small displacement occurs, it can be reset to prevent further detachment. At the same time, the elastic pressure rod 5 improves the vibration resistance of the crank pin connection and reduces the possibility of loosening. Based on the pressure detection value, an early warning of detachment can be given, which can detect the loosening trend in time. Compared with the displacement detection method, the early warning is more timely and safer.

[0043] Example 2:

[0044] like Figure 2 , Figure 3 As shown, based on the above embodiment 1, the anti-detachment pad 3 includes: a first plate 11 and a second plate 12. The first plate 11 and the second plate 12 are provided with a first threaded hole 13 at their center. The crank pin 2 is provided with a corresponding first threaded area. The first plate 11 is provided with a plurality of arc-shaped grooves on the side away from the bearing 1. One end of the elastic pressure rod 5 is pressed into the arc-shaped groove. The second plate 12 is provided with an arc-shaped protrusion 14, which contacts the side of the crank.

[0045] The working principle and beneficial effects of the above technical solution are as follows:

[0046] The anti-detachment pad 3 comprises two plates: a first plate 11 for connecting to the elastic pressure rod 5, and a second plate 12 for fitting against the side of the crank. During installation, the first plate 11 and the second plate are fitted onto the crank pin 2, and the first threaded hole 13 is screwed into the first threaded area to fix the anti-detachment pad 3. After the locking plate 4 is installed, the elastic pressure rod 5 is released from the first plate 11. As the locking plate 4 is installed, the elastic pressure rod 5 is compressed while the first plate 11 moves until its end engages with the arc-shaped groove, ensuring accurate relative positioning of the locking plate 4 and the anti-detachment pad 3, facilitating subsequent positioning of other components. An arc-shaped protrusion 14 is provided on the second plate 12, contacting the side of the crank to reduce friction and dampen vibration.

[0047] Example 3:

[0048] like Figure 5 As shown, based on the above embodiment 2, the locking plate 4 is provided with a second threaded hole 18 at its center, the crank pin 2 is provided with a corresponding second threaded area, the other end of the elastic pressure rod 5 is connected to the locking plate 4, and multiple elastic pressure rods 5 are evenly arranged along the circumference of the locking plate 4.

[0049] The working principle and beneficial effects of the above technical solution are as follows:

[0050] The locking plate 4 has a second threaded hole 18 at its center. When installing the locking plate 4, the locking plate 4 is sleeved on the crank pin 2, and the second threaded hole 18 is screwed into the second threaded area to fix the locking plate 4. The elastic pressure rods 5 are evenly distributed on the locking plate 4 so that the elastic force of the elastic pressure rods 5 is evenly distributed and acts on the anti-detachment pad 3, so that the anti-detachment pad 3 is balanced by force, reducing the risk of local deformation or wear of the anti-detachment pad 3 and extending the service life of the device.

[0051] Example 4:

[0052] like Figure 5 As shown, based on the above embodiment 2, the locking plate 4 further includes: a locking groove 15, a locking rod 16, and a locking ring 17. Multiple locking grooves 15 are evenly arranged along the circumference of the locking plate 4, and the center line of the length direction of the locking groove 15 passes through the center of the locking plate 4. The locking rod 16 is slidably connected in the locking groove 15, and the end of the locking rod 16 near the bearing 1 passes through the anti-loosening pad 3. The locking ring 17 is arranged around the other end of the locking rod 16, and the locking ring 17 is elastic.

[0053] The working principle and beneficial effects of the above technical solution are as follows:

[0054] A locking rod 16 is provided on the locking plate 4. In the initial position, the locking rod 16 is located at the end of the locking groove 15 away from the center of the locking plate 4, and the locking ring 17 is in the unfolded state. When the locking plate 4 is installed, the locking rod 16 can rotate with the locking plate 4 and is located outside the anti-detachment pad 3, without interfering with the locking rod 16 and the anti-detachment pad 3. When the controller detects a risk of detachment, it controls the locking ring 17 to deform and tighten. The locking ring 17 wraps around the locking rod 16, thus pulling the locking rod 16 to slide along the locking groove 15 and approach the center of the locking plate 4. The locking rod 16 then locks with the crank pin 2 and the anti-detachment pad 3. Through the above structural design, the elastically set locking ring 17 drives the locking rod 16 to move, actively locking according to the detachment risk detection result, limiting the crank pin 2 connector, and improving the safety of the device.

[0055] Example 5:

[0056] like Figure 4 , Figure 6 As shown, based on the above embodiment 4, a plurality of support rods 19 are provided on the inner side of the locking ring 17, and a plurality of locking blocks 21 are connected to the ends of the support rods 19. The locking blocks 21 are set as arc-shaped blocks, and an annular groove 22 is correspondingly provided on the crank pin 2.

[0057] The working principle and beneficial effects of the above technical solution are as follows:

[0058] A locking block 21 is connected to the inner side of the locking ring 17 via a support rod 19. When the locking ring 17 deforms and tightens, it drives the locking block 21 to move towards the center of the locking plate 4, causing the locking block 21 to engage with the annular groove 22, increasing the axial constraint between the locking ring 17 and the crank pin 2. Since the connection between the locking ring 17 and the locking rod 16 is set as a rigid connection, and the locking rod 16 is connected to the locking slide groove 15 through a slider and a slide groove, its axial movement is reduced. Therefore, limiting the locking ring 17 restricts the axial movement of the locking plate 4, preventing the locking plate 4 from detaching from the crank pin 2. Through the above structural design, the axial movement of the locking plate 4 and the crank pin 2 is limited by the tightening of the locking ring 17, preventing the movement of the locking plate 4, and thus preventing the movement of the anti-detachment pad 3.

[0059] Example 6:

[0060] like Figure 3 As shown, based on the above embodiment 5, the locking rod 16 extends to the first plate 11, and the edges of the first plate 11 and the second plate 12 are provided with limiting grooves 23. Multiple limiting grooves 23 are evenly arranged in the circumferential direction. In the initial position, the locking rod 16 is located outside the limiting groove 23 and corresponds to the groove opening of the limiting groove 23.

[0061] The working principle and beneficial effects of the above technical solution are as follows:

[0062] When the locking plate 4 is installed, the locking rod 16 rotates with the locking plate 4 until it aligns with the opening of the limiting slide groove 23. When the locking ring 17 deforms and tightens, it moves the locking rod 16 towards the center, allowing it to slide along the limiting slide groove 23 and engage within it, thus securing the anti-detachment pad 3. This restricts the circumferential rotation of the first plate 11 and the second plate 12, limiting the rotation of the first threaded holes 13 in the first threaded area. This increases the resistance to the rotational displacement of the anti-detachment pad 3, further limiting its position. Through the locking ring 17 and the locking rod 16, both the axial and circumferential directions of the locking plate 4 and the anti-detachment pad 3 are simultaneously limited, restricting their movement and reducing the possibility of simultaneous disengagement. This improves the anti-detachment performance of the crank pin and makes the pumping unit more stable.

[0063] Example 7:

[0064] Based on the above embodiment 4, when the detected pressure sensor reaches a preset value, the locking rod 16 extends into the second plate 12 without protruding from the second plate 12.

[0065] The working principle and beneficial effects of the above technical solution are as follows:

[0066] When the detected pressure sensor reaches the preset value, the locking rod 16 is activated and moves along the limiting slide groove 23 into the anti-detachment pad 3; the locking rod 16 can extend into the second plate 12 without protruding from the second plate 12, so that the locking rod 16 does not interfere with the crank when it is activated, ensuring that the locking process is carried out normally.

[0067] Example 8:

[0068] like Figure 2 , Figure 4 , Figure 6 As shown, based on the above embodiment 4, a telescopic frame 27 is provided on the locking rod 16. The telescopic frame 27 includes multiple telescopic arms 28, and each telescopic arm 28 is connected to the end of each locking rod 16. A pin 29 is connected to the center of the telescopic frame 27, and a socket 31 is provided at the end of the crank pin 2. The pin 29 is inserted into the socket 31.

[0069] The working principle and beneficial effects of the above technical solution are as follows:

[0070] A telescopic frame 27 is provided on the locking rod 16. The telescopic frame 27 has multiple telescopic arms 28, and the telescopic arms 28 are elastic. When not locking, the locking rod 16 can move away from the center of the locking plate 4 and remain stable under the elastic force of the telescopic arms 28. When the locking rod 16 moves towards the center of the locking plate 4 during the locking action, the telescopic arms 28 can be compressed and shortened, while still maintaining the stable position of the locking rod 16. A pin 29 is provided at the center of the telescopic frame 27. When the locking plate 4 and crank pin 2 are installed, the pin 29 is inserted into the insertion hole 31, which can position the locking plate 4 and help maintain the relative position of the telescopic frame 27 and crank pin 2. This prevents the telescopic arms 28 from extending and retracting inconsistently during the telescopic process, and prevents the center of the telescopic frame 27 from shifting, thus ensuring the restriction of the anti-detachment pad 3 in all directions.

[0071] Example 9:

[0072] like Figure 6 As shown, based on the above embodiment 8, an electromagnetic block is provided inside the pin 29, and the electromagnetic block is electrically connected to the controller; the locking ring 17 is hollow, and multiple magnetic areas 33 are provided inside the locking ring 17, and iron powder is distributed in the magnetic areas 33. When the electromagnetic block is energized, it attracts the magnetic areas 33.

[0073] The working principle and beneficial effects of the above technical solution are as follows:

[0074] When the controller detects a tendency for the crank to fall off, it energizes the electromagnet, making it magnetic. Multiple magnetic zones 33 are located within the locking tube 17. The electromagnet attracts these zones, causing the elastic portion of the locking ring 17 to move inward and tighten, thus driving the deformation of the locking ring 17 and firmly locking the locking block 21 into the annular groove 22. Through this structural design, the tightening and releasing of the locking ring 17 is achieved by controlling the flow of current within the electromagnet, and multiple locking rods 16 are synchronously positioned. Based on pressure detection results, a rapid response is possible without manual control, improving the efficiency of the anti-fall-off locking operation and ensuring protective effectiveness. Furthermore, based on the pressure detection results, the current within the electromagnet can be controlled to regulate the magnetic force, ensuring effective locking.

[0075] Example 10:

[0076] like Figure 6 As shown, based on the above embodiment 9, the corner of the locking ring 17 is wrapped around the locking rod 16, the locking ring 17 forms a convex area at the corner, and the locking ring 17 between adjacent corners forms a concave area; the magnetic area 33 is disposed in the convex area and concave area of ​​the locking ring 17.

[0077] The working principle and beneficial effects of the above technical solution are as follows:

[0078] The corners of the locking ring 17 are set as convex areas, and concave areas are formed at adjacent corners, so that the locking ring 17 forms a wave-shaped structure; the convex areas wrap around the locking rod 16 to ensure the stability of the locking rod 16's movement; the magnetic area 33 is set as rigid, which facilitates the connection between the convex locking ring 17 and the locking rod 16, and at the same time facilitates the fixation of the concave locking ring 17 to the support rod 19; the rest of the locking ring 17 is set as elastic, which can realize the deformation and tightening of the locking ring 17.

[0079] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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.

[0080] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A crank pin anti-detachment device for an oil pumping unit, characterized in that, include: Bearing (1), bearing (1) is connected to one side of crank pin (2); Anti-detachment pad (3), the anti-detachment pad (3) is threaded to the other side of crank pin (2); Locking plate (4) is threaded onto crank pin (2) and located outside anti-detachment pad (3). An elastic pressure rod (5) is connected between locking plate (4) and anti-detachment pad (3). The detachment warning unit includes a pressure sensor and an alarm. The pressure sensor is used to detect the pressure of the crank on the anti-detachment pad (3). The controller activates the alarm based on the pressure detection result. The anti-detachment pad (3) includes: a first plate (11) and a second plate (12). The first plate (11) and the second plate (12) are provided with a first threaded hole (13) at their center. The crank pin (2) is provided with a corresponding first threaded area. The first plate (11) is provided with multiple arc-shaped grooves on the side away from the bearing (1). One end of the elastic pressure rod (5) is pressed into the arc-shaped groove. The second plate (12) is provided with an arc-shaped protrusion (14). The arc-shaped protrusion (14) contacts the side of the crank. The locking plate (4) also includes: a locking groove (15), a locking rod (16) and a locking ring (17). Multiple locking grooves (15) are evenly arranged along the circumference of the locking plate (4), and the center line of the length direction of the locking groove (15) passes through the center of the locking plate (4). The locking rod (16) is slidably connected in the locking groove (15), and the end of the locking rod (16) near the bearing (1) passes through the anti-loosening pad (3). The locking ring (17) is arranged around the other end of the locking rod (16), and the locking ring (17) is elastic. A telescopic frame (27) is provided on the locking rod (16). The telescopic frame (27) includes multiple telescopic arms (28), and each telescopic arm (28) is connected to the end of each locking rod (16). A pin (29) is connected to the center of the telescopic frame (27). A socket (31) is provided at the end of the crank pin (2), and the pin (29) is inserted into the socket (31). An electromagnetic block is installed inside the pin (29), and the electromagnetic block is electrically connected to the controller; the locking ring (17) is hollow, and multiple magnetic areas (33) are installed inside the locking ring (17), and iron powder is distributed in the magnetic areas (33). When the electromagnetic block is energized, it attracts the magnetic areas (33).

2. The crank pin anti-dislodgement device for an oil pumping unit according to claim 1, characterized in that, The locking plate (4) has a second threaded hole (18) in the center, and the crank pin (2) has a corresponding second threaded area. The other end of the elastic pressure rod (5) is connected to the locking plate (4), and multiple elastic pressure rods (5) are evenly arranged along the circumference of the locking plate (4).

3. The crank pin anti-dislodgement device for an oil pumping unit according to claim 1, characterized in that, Multiple support rods (19) are provided on the inner side of the locking ring (17), and multiple locking blocks (21) are connected to the end of the support rods (19). The locking blocks (21) are set as arc blocks, and an annular groove (22) is provided on the crank pin (2).

4. The crank pin anti-dislodgement device for an oil pumping unit according to claim 1, characterized in that, The locking rod (16) extends to the first plate (11). The first plate (11) and the second plate (12) are provided with limit grooves (23) along their edges. Multiple limit grooves (23) are evenly arranged along the circumferential direction. In the initial position, the locking rod (16) is located outside the limit groove (23) and corresponds to the opening of the limit groove (23).

5. A crank pin anti-dislodgement device for an oil pumping unit according to claim 1, characterized in that, When the detected pressure sensor reaches the preset value, the locking rod (16) extends into the second plate (12) without protruding from the second plate (12).

6. A crank pin anti-dislodgement device for an oil pumping unit according to claim 1, characterized in that, The corner of the locking ring (17) is wrapped around the locking rod (16). The locking ring (17) forms a convex area at the corner and a concave area between adjacent corners. The magnetic area (33) is set in the convex and concave areas of the locking ring (17).

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