A sucker rod elevator

Abstract

The present application relates to the technical field of oilfield machinery, in particular to a sucker rod elevator. It comprises an outer cylinder and an inner cylinder, the inner cylinder is sleeved in the outer cylinder; a thrust rod assembly, comprising a thrust rod, a thrust baffle and a thrust pin; a driving jaw assembly, comprising a jaw base device, a jaw, a jaw shell and a jaw limiter, the jaw base device is connected with the thrust cylinder, the jaw is arranged on the jaw base device, the jaw shell is fixed on the inner side of the inner cylinder, the jaw limiter is fixed in the jaw shell and forms a limiting groove, the jaw can move along the trajectory of the limiting groove to grab or release the sucker rod; the thrust baffle and the thrust pin of the thrust rod assembly are respectively matched with the two forms of the sucker rod with a coupling and the sucker rod without a coupling, so that universal grabbing can be realized without replacing parts, the operation steps are reduced, and the risk of slipping is reduced. The combination of the outer cylinder and the inner cylinder cooperates with the subsequent buffer design to avoid the damage of the sucker rod caused by rigid butt joint and ensure the continuity of the operation.

Description

Technical Field

[0001] This invention relates to the field of oilfield machinery technology, specifically to a sucker rod clamp. Background Technology

[0002] In oilfield extraction operations, the sucker rod, as the core component connecting the pumping unit and the pumping pump, directly impacts extraction efficiency and cost through the safety and efficiency of its lifting, lowering, and docking operations. The sucker rod clamp, a key tool for gripping, lifting, and lowering the sucker rod, is crucial equipment for ensuring continuous operation. However, existing sucker rod clamp technology still suffers from several shortcomings in practical applications, failing to meet the demands of complex operating conditions. These shortcomings are as follows:

[0003] Existing clamps are mostly designed for single-type sucker rods, only compatible with sucker rods with or without couplings. However, in actual operation, sucker rods exist in two common forms, "with couplings" and "without couplings," depending on their specifications and usage scenarios. If traditional clamps are used, it is necessary to frequently change the adapter parts or adjust the structure, which not only increases the operation steps and extends the operation time, but also easily leads to unstable clamping of the sucker rod due to improper adaptation, posing a risk of slippage.

[0004] Traditional clamps rely heavily on manual triggering or mechanical linkage for gripping and releasing, lacking precise automatic sensing and feedback mechanisms. Manually judging the position of the sucker rod and initiating the clamping action is not only labor-intensive but also prone to inadequate clamping due to operational delays or misjudgments, causing the sucker rod to shake, collide, or even fall, seriously threatening operational safety.

[0005] When sucker rods are inserted into the clamp or connected to other components, the traditional clamps, which are mostly rigid structures, lack cushioning design due to the influence of the operating environment. This rigid connection makes the sucker rod susceptible to instantaneous impact forces, leading to bending, deformation, or even breakage of the rod, increasing equipment maintenance costs, and affecting the continuity of subsequent mining operations. Summary of the Invention

[0006] This application addresses, to at least some extent, one of the technical problems in the related art.

[0007] Therefore, this application aims to provide a sucker rod hanger.

[0008] To achieve the above objectives, in a first aspect, this application provides a sucker rod hanger, comprising:

[0009] The outer cylinder and the inner cylinder are fitted inside the outer cylinder, and the two together form the outer shell of the hanging clamp body;

[0010] The thrust rod assembly includes a thrust rod, a thrust baffle and a thrust pin disposed at the end of the thrust rod, wherein the thrust baffle and the thrust pin are respectively adapted to two forms of sucker rod with and without coupling;

[0011] The drive assembly includes a hydraulic cylinder and a thrust cylinder, wherein the hydraulic cylinder is connected to the thrust cylinder in a transmission manner and can drive the thrust cylinder to reciprocate in a vertical direction;

[0012] The chuck assembly includes a chuck base device, a chuck, a chuck housing, and a chuck limiter. The chuck base device is connected to the thrust cylinder, the chuck is mounted on the chuck base device, the chuck housing is fixed to the inner side of the inner cylinder, and the chuck limiter is fixed inside the chuck housing and forms a limiting groove. The chuck can move along the trajectory of the limiting groove to grab or release the sucker rod.

[0013] The triggering assembly includes a first triggering device and a second triggering device. The first triggering device is linked to the thrust rod and is used to sense the movement of the thrust rod and send a start signal to the hydraulic cylinder. The second triggering device is linked to the thrust cylinder and is used to sense the gripping state of the chuck and control the device to maintain the gripping state.

[0014] In the technical solution, the thrust baffle and thrust pin of the thrust rod assembly are adapted to both the form of the sucker rod with and without coupling, respectively. Universal gripping can be achieved without replacing parts, reducing operation steps and lowering the risk of slippage.

[0015] The first triggering device of the triggering component senses the movement of the push rod and automatically starts the drive component, while the second triggering device senses the gripping state and maintains a firm grip, reducing manual intervention and lowering labor intensity and the risk of operational errors.

[0016] The combined structure of the outer and inner cylinders, along with subsequent buffer design, avoids damage to the sucker rod caused by rigid connection, ensuring operational continuity.

[0017] In one embodiment of this application, the thrust baffle is an annular plate structure, sleeved on the outside of the thrust pin, and the outer diameter of the thrust baffle is larger than the outer diameter of the thrust pin, so as to adapt to the end triggering of the coupling and the sucker rod respectively.

[0018] In the technical solution, the outer diameter of the annular thrust baffle is larger than that of the thrust pin, resulting in a larger contact area with the coupling. The pin is adapted to the sucker rod body, and the thrust rod can be stably triggered in both configurations, thus improving triggering reliability.

[0019] In one embodiment of this application, the first triggering device includes a trigger paddle, a paddle guide assembly, and a guide post. The guide post is fixed to the upper end of the thrust rod. Vertical limiting grooves are provided on both sides of the thrust cylinder. A guide groove is provided on the paddle guide assembly. The guide post passes through the vertical limiting groove and the guide groove, which can drive the paddle guide assembly and the trigger paddle to rotate to trigger the first triggering device.

[0020] In the technical solution, the guide post passes through the vertical limiting groove of the thrust cylinder and the guide groove of the paddle guide assembly, which converts the vertical movement of the thrust rod into the rotation of the trigger paddle, realizing the precise transmission of mechanical structure and sensing signal, and high trigger sensitivity.

[0021] The vertical limiting groove restricts the movement direction of the guide column, ensuring the stability of the linkage trajectory between the push rod and the trigger paddle, avoiding false triggering caused by shaking, and improving the reliability of the sensing.

[0022] In one embodiment of this application, the second triggering device includes a trigger baffle fixed above the thrust cylinder. When the chuck grips the sucker rod, the thrust cylinder drives the trigger baffle to descend into the sensing range of the triggering device, thereby triggering the second triggering device to send a holding signal.

[0023] In the technical solution, the trigger baffle descends with the thrust cylinder to the sensing range of the second triggering device. Only when the chuck fully grips the sucker rod and the thrust cylinder reaches the working position will a holding signal be sent to ensure stable clamping and avoid slippage caused by premature or delayed holding.

[0024] It uses mechanical displacement to trigger the induction, requires no complex circuitry, is adaptable to the harsh environment of oil fields with high dust and vibration, and has a low failure rate.

[0025] In one embodiment of this application, a spring and a limiting washer are provided between the outer cylinder and the inner cylinder. The spring is sleeved on the outside of the inner cylinder, and the limiting washer is fixed to the outer wall of the inner cylinder. The lower wall of the outer cylinder cooperates with the limiting washer to form a vertical stroke limit to control the compression range of the spring.

[0026] In the technical solution, the spring can absorb the instantaneous impact force when the sucker rod is connected, avoiding the bending and deformation of the rod caused by rigid collision, and reducing equipment maintenance costs.

[0027] The limiting shim cooperates with the lower wall of the outer cylinder to limit the relative movement of the inner and outer cylinders, ensuring that the spring is always within the effective compression range, extending the service life of the spring, and avoiding the decrease in clamping accuracy caused by excessive buffering.

[0028] In one embodiment of this application, the limiting groove of the claw limiter has an inclined trajectory. When the thrust cylinder drives the claw seat device to move up and down, the claw retracts or opens along the inclined trajectory to grasp or release the sucker rod.

[0029] In the technical solution, as the chuck retracts along the inclined trajectory, the contact pressure with the sucker rod gradually increases as the thrust cylinder descends, thus avoiding damage to the sucker rod surface caused by instantaneous clamping.

[0030] The inclined trajectory forcibly constrains the movement direction of the chucks, and the symmetrical design of multiple chucks allows for synchronous contraction or opening, resulting in uniform clamping force and preventing swaying caused by eccentric force on the sucker rod.

[0031] In one embodiment of this application, the thrust rod and the thrust cylinder are connected by a limiting connection, and the two can slide relative to each other. When the thrust rod is pushed upward by the sucker rod or the coupling, the thrust cylinder can independently reciprocate under the drive of the hydraulic cylinder.

[0032] In the technical solution, the two can slide relative to each other. The thrust rod, pushed by the sucker rod, is only responsible for triggering the signal, while the thrust cylinder, driven by the hydraulic cylinder, independently performs the gripping action, avoiding mutual interference and ensuring that the triggering and driving links are accurate.

[0033] Limiting connections prevent the two from separating, ensuring they remain connected during relative movement and avoiding equipment malfunctions caused by parts falling off.

[0034] In one embodiment of this application, the hydraulic cylinder drives the thrust cylinder to perform intermittent up-and-down reciprocating motions. Through the continuous thrust of the thrust cylinder on the claw seat device, the claws gradually tighten and maintain the clamping force on the sucker rod.

[0035] In the technical solution, the intermittent reciprocating motion causes the thrust cylinder to apply a continuous thrust to the claw seat device, and the claw gradually tightens along the inclined trajectory, eventually forming a stable clamping force to avoid loose clamping.

[0036] The reciprocating motion can be adjusted to accommodate sucker rod diameter deviations within a certain range, thus improving the versatility of the device.

[0037] In one embodiment of this application, an auxiliary unloading structure is also included. When the operation is completed, the lower end of the sucker rod is supported by an external chuck device, and the hydraulic cylinder drives the thrust cylinder to move in the opposite direction, causing the chuck to open along the chuck limiter trajectory, so that the sucker rod is disengaged from the chuck.

[0038] In the technical solution, when the weight of the sucker rod is supported by the external chuck, the hydraulic cylinder drives the chuck jaws to open in the opposite direction, preventing the sucker rod from falling due to its own weight during unloading and ensuring the safety of the unloading process.

[0039] The reverse motion of the hydraulic cylinder enables the chuck to open automatically, eliminating the need for manual prying, simplifying the unloading process and improving work efficiency.

[0040] As can be seen from the above technical solutions, additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0042] Figure 1 A schematic diagram of the overall structure of a sucker rod hanger;

[0043] Figure 2 This is a magnified view of a sucker rod hanger.

[0044] Figure 3 This is a magnified view of a sucker rod hanger.

[0045] Figure 4 This is a partial enlarged view of the claw assembly of a sucker rod hanger.

[0046] In the picture,

[0047] 1. Outer cylinder; 11. Inner cylinder; 12. Spring; 13. Limiting washer;

[0048] 2. Sucker rod; 21. Coupling;

[0049] 3. Thrust rod assembly; 31. Thrust rod; 32. Thrust baffle; 33. Thrust ejector pin;

[0050] 4. Drive assembly; 41. Hydraulic cylinder; 42. Thrust cylinder; 43. Vertical limiting groove;

[0051] 5. Claw assembly; 51. Claw base device; 52. Claw; 53. Claw housing; 54. Claw limiter; 55. Limiting groove;

[0052] 6. Trigger assembly; 61. First trigger device; 611. Trigger paddle; 612. Paddle guide assembly; 613. Guide groove; 614. Guide post; 62. Second trigger device; 621. Trigger baffle.

[0053] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0054] In the description of this application, 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", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0055] In this application, unless otherwise expressly 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 components; 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0056] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0059] It should be noted that in oilfield extraction operations, the sucker rod, as the core component connecting the pumping unit and the pumping pump, directly impacts extraction efficiency and cost through the safety and efficiency of its lifting, lowering, and docking operations. The sucker rod clamp, as a key tool for gripping, lifting, and lowering the sucker rod, is crucial equipment for ensuring continuous operation. However, existing sucker rod clamp technology still has many shortcomings in practical applications, failing to meet the operational needs under complex conditions. These shortcomings are as follows:

[0060] Existing clamps are mostly designed for single-type sucker rods, only compatible with sucker rods with or without couplings. However, in actual operation, sucker rods exist in two common forms, "with couplings" and "without couplings," depending on their specifications and usage scenarios. If traditional clamps are used, it is necessary to frequently change the adapter parts or adjust the structure, which not only increases the operation steps and extends the operation time, but also easily leads to unstable clamping of the sucker rod due to improper adaptation, posing a risk of slippage.

[0061] Traditional clamps rely heavily on manual triggering or mechanical linkage for gripping and releasing, lacking precise automatic sensing and feedback mechanisms. Manually judging the position of the sucker rod and initiating the clamping action is not only labor-intensive but also prone to inadequate clamping due to operational delays or misjudgments, causing the sucker rod to shake, collide, or even fall, seriously threatening operational safety.

[0062] When sucker rods are inserted into the clamp or connected to other components, the traditional clamps, which are mostly rigid structures, lack cushioning design due to the influence of the operating environment. This rigid connection makes the sucker rod susceptible to instantaneous impact forces, leading to bending, deformation, or even breakage of the rod, increasing equipment maintenance costs, and affecting the continuity of subsequent mining operations.

[0063] In the following, embodiments of this application will be described in detail with reference to the accompanying drawings.

[0064] like Figures 1 to 4 As shown in the schematic embodiment of a sucker rod hanger in this application, the sucker rod 2 hanger includes an outer cylinder 1 and an inner cylinder 11, wherein the inner cylinder 11 is sleeved inside the outer cylinder 1, and the two form the main body shell of the hanger.

[0065] The sucker rod 2 hanger includes a thrust rod assembly 3, which includes a thrust rod, a thrust baffle 32 located at the end of the thrust rod 31, and a thrust pin 33. The thrust baffle 32 and the thrust pin 33 are respectively adapted to two forms of the sucker rod 2 with and without coupling 21.

[0066] The sucker rod 2 hanger includes a drive assembly 4, which includes a hydraulic cylinder 41 and a thrust cylinder 42. The hydraulic cylinder 41 is connected to the thrust cylinder 42 and can drive the thrust cylinder 42 to reciprocate in the vertical direction.

[0067] The sucker rod 2 clamp includes a claw assembly 5, which includes a claw seat device 51, a claw 52, ​​a claw housing 53, and a claw limiter 54. The claw seat device 51 is connected to the thrust cylinder 42, the claw 52 is disposed on the claw seat device 51, the claw housing 53 is fixed to the inner side of the inner cylinder 11, and the claw limiter 54 is fixed inside the claw housing 53 and forms a limiting groove 55. The claw 52 can move along the trajectory of the limiting groove 55 to grab or release the sucker rod 2.

[0068] The sucker rod 2 clamp includes a trigger assembly 6, which includes a first trigger device 61 and a second trigger device 62. The first trigger device 61 is linked with the thrust rod 31 and is used to sense the movement of the thrust rod 31 and send a start signal to the hydraulic cylinder 41. The second trigger device 62 is linked with the thrust cylinder 42 and is used to sense the gripping state of the claw 52 and control the device to maintain the gripping state.

[0069] The outer cylinder 1 and the inner cylinder 11 adopt a nested design. The inner cylinder 11 is coaxially sleeved inside the outer cylinder 1. The two form a closed main frame of the lifting clamp through the limiting structure at the upper and lower ends, which provides protection and support for the internal components, and at the same time adapts to the harsh environment of dust and vibration in oilfield operations.

[0070] The thrust rod 31 is vertically installed near the central axis of the inner cylinder 11, and its lower end integrates a thrust baffle 32 and a thrust pin 33. The thrust baffle 32 is an annular steel plate, fitted onto the outside of the cylindrical thrust pin 33, and the outer diameter of the baffle is larger than the diameter of the pin. When the sucker rod 2 with coupling 21 enters the clamp, the lower end face of coupling 21 contacts the thrust baffle 32; when the sucker rod 2 without coupling 21 enters, the rod body directly contacts the thrust pin 33. In both cases, the thrust rod 31 can be pushed upward.

[0071] The jaw housing 53 is annular and fixed to the inner wall of the inner cylinder 11. The jaw limiter 54 on its inner side has symmetrical inclined limiting grooves 55. The jaw 52 is connected to the jaw seat device 51 via a pin. The jaw seat device 51 is fixed to the lower end of the thrust cylinder 42, and the end of the jaw 52 is embedded in the limiting groove 55. When the thrust cylinder 42 descends, the jaw 52 retracts towards the center along the limiting groove 55 to grip the sucker rod 2; when it rises, it opens outwards to release the sucker rod 2.

[0072] In one embodiment, the thrust baffle 32 is an annular plate structure, sleeved on the outside of the thrust pin 33, and the outer diameter of the thrust baffle 32 is larger than the outer diameter of the thrust pin 33, so as to adapt to the end triggering of the coupling 21 and the sucker rod 2 respectively.

[0073] The large outer diameter design of the thrust baffle 32 is adapted to the larger end face of the coupling 21, and the small diameter design of the thrust pin 33 is adapted to the small end face of the sucker rod 2 body, ensuring that stable triggering can be achieved through the corresponding structure regardless of whether the sucker rod 2 is equipped with coupling 21, thus avoiding triggering failure due to insufficient contact area.

[0074] In one embodiment, the first triggering device 61 includes a trigger paddle 611, a paddle guide assembly 612, and a guide post 614. The guide post 614 is fixed to the upper end of the thrust rod 31. Vertical limiting grooves 43 are provided on both sides of the thrust cylinder 42. A guide groove 613 is provided on the paddle guide assembly 612. The guide post 614 passes through the vertical limiting groove 43 and the guide groove 613, which can drive the paddle guide assembly 612 and the trigger paddle 611 to rotate to trigger the first triggering device 61.

[0075] The paddle guide assembly 612 has an inclined guide groove 613 on its surface. One end of the guide groove 613 is close to the lower end of the vertical limiting groove 43, and the other end extends towards the trigger paddle 611. The groove width matches the diameter of the guide post 614.

[0076] The tilt angle of the guide groove 613 can be designed according to requirements, so that the rotation amplitude of the trigger paddle 611 is linearly related to the rising distance of the push rod 31, which facilitates precise control of the triggering timing and avoids false sensing.

[0077] The overall structure is purely mechanically linked, without the need for complex circuits or sensors to directly contact the moving parts. It can withstand harsh environments such as oil and dust, and its failure rate is much lower than that of electronic trigger structures, thus extending the service life of the device.

[0078] In one embodiment, the second triggering device 62 includes a trigger baffle 621 fixed above the thrust cylinder 42. When the pawl 52 grips the sucker rod 2, the thrust cylinder 42 drives the trigger baffle 621 to descend into the sensing range of the triggering device, thereby triggering the second triggering device 62 to send a holding signal.

[0079] When the chuck 52 does not grip the sucker rod 2, the thrust cylinder 42 is in its initial upper position, and the distance between the trigger baffle 621 and the second trigger device 62 is greater than the sensing range, so the device has no signal output. When the sucker rod 2 enters the clamp and pushes the thrust rod 31 to trigger the first trigger device 61, the hydraulic cylinder 41 drives the thrust cylinder 42 to move downward, causing the chuck 52 to retract along the limiting groove 55 and gradually grip the sucker rod 2. When the chuck 52 fully grips the sucker rod 2, that is, when the preset gripping state is reached, the thrust cylinder 42 descends to the working lower position. At this time, the trigger baffle 621 moves down accordingly, and the distance between it and the second trigger device 62 is shortened to enter the sensing range. The second trigger device 62 immediately senses and outputs an electrical signal, which is transmitted to the control system, causing the hydraulic cylinder 41 to stop driving and maintain the current state, ensuring that the chuck 52 continues to grip the sucker rod 2.

[0080] The continuous output of the signal depends on the relative position of the trigger baffle 621 and the sensor. If the pawl 52 is accidentally loosened, causing the thrust cylinder 42 to move upward and the trigger baffle 621 to leave the sensing range, the second trigger device 62 will immediately stop outputting the holding signal, and the control system can promptly start the tightening action to form a safety closed loop.

[0081] In one embodiment, a spring 12 and a limiting washer 13 are provided between the outer cylinder 1 and the inner cylinder 11. The spring 12 is sleeved on the outside of the inner cylinder 11, and the limiting washer 13 is fixed to the outer wall of the inner cylinder 11. The lower wall of the outer cylinder 1 cooperates with the limiting washer 13 to form a vertical stroke limit to control the compression range of the spring 12.

[0082] The inner cylinder 11 is coaxially sleeved inside the outer cylinder 1, and the two can slide relative to each other along the axial direction. The inner side of the lower wall of the outer cylinder 1 is provided with an annular protrusion. When the inner cylinder 11 moves downward relative to the outer cylinder 1, the limiting gasket 13 will contact the annular protrusion on the lower wall of the outer cylinder 1 to form a rigid limit, which restricts the maximum downward movement distance of the inner cylinder 11.

[0083] When the sucker rod 2 enters the clamp and connects with the internal components, if a downward impact force is generated, the inner cylinder 11 will move downward relative to the outer cylinder 1, compressing the spring 12. The elastic force of the spring 12 can buffer the impact force and prevent rigid transmission to the sucker rod 2. When the impact force is too large and causes the inner cylinder 11 to move down until the limiting pad 13 contacts the lower wall of the outer cylinder 1, the stroke is forcibly terminated to prevent the spring 12 from being over-compressed and failing.

[0084] It should be noted that after the clamp has gripped the sucker rod, the subsequent operation will involve connecting or uncoupling the sucker rod 2 with the remaining tubing rods below. Impact forces are likely to be generated during the connection process. If the connection is rigid, it may cause the sucker rod 2 to bend or the structure to change.

[0085] The coaxial design of the inner cylinder 11 and the outer cylinder 1, and the annular structure of the limiting shim 13, ensure that there is no radial offset when the two move relative to each other, and the spring 12 is subjected to uniform force, avoiding the spring 12 from tilting or the inner cylinder 11 from jamming due to uneven load, and adapting to the vibration environment of oilfield operations.

[0086] In one embodiment, the limiting groove 55 of the claw limiter 54 is inclined. When the thrust cylinder 42 drives the claw seat device 51 to move up and down, the claw 52 retracts or opens along the inclined trajectory to grasp or release the sucker rod 2.

[0087] When the thrust cylinder 42 drives the claw seat device 51 to move downward, the inner end of the claw 52 slides along the inclined limiting groove 55 toward the center of the limiter, forcing the claw 52 to retract inward around the hinge point, and the arc-shaped inner side gradually grips the sucker rod 2; when the thrust cylinder 42 drives the claw seat device 51 to move upward, the inner end of the claw 52 slides outward along the limiting groove 55, the claw 52 opens outward, releases the clamping of the sucker rod 2, and completes the release action.

[0088] The inclined limiting groove 55 makes the contraction / opening amplitude of the claw 52 linearly related to the vertical displacement of the thrust cylinder 42. Multiple claws 52 are symmetrically distributed along the circumference, which can form a uniform radial clamping force on the sucker rod 2, avoiding the sucker rod 2 from shaking or surface damage due to force eccentricity.

[0089] The chuck 52 gradually retracts along the inclined trajectory, and the clamping force gradually increases as the thrust cylinder 42 moves down, rather than clamping instantly. This reduces the impact on the sucker rod 2, making it especially suitable for sucker rods 2 with easily worn surfaces, thus reducing maintenance costs.

[0090] The inclined trajectory of the limiting groove 55 provides a certain amount of movement margin for the chuck 52. By adjusting the downward stroke of the thrust cylinder 42, it can be adapted to sucker rods 2 within a certain diameter range. It can meet the requirements of various specifications without replacing the chuck 52, thus enhancing the versatility of the device.

[0091] In one embodiment, the thrust rod 31 and the thrust cylinder 42 are connected by a limiting connection and can slide relative to each other. When the thrust rod 31 is pushed upward by the sucker rod 2 or the coupling 21, the thrust cylinder 42 can independently reciprocate under the drive of the hydraulic cylinder 41.

[0092] When the sucker rod 2 or coupling 21 pushes the thrust rod 31 upward, the thrust rod 31 can slide independently upward along the central axis of the thrust cylinder 42. At this time, the thrust cylinder 42 remains stationary if it is not driven by the hydraulic cylinder 41. Conversely, when the hydraulic cylinder 41 drives the thrust cylinder 42 to move up and down reciprocally, the thrust rod 31 can remain stationary relative to the thrust cylinder 42 or move synchronously with it if it is not pushed. For example, after the sucker rod 2 pushes the thrust rod 31 upward to trigger the first triggering device 61, the hydraulic cylinder 41 drives the thrust cylinder 42 to move downward. At this time, the thrust rod 31 remains in the upper position, and the thrust cylinder 42 slides downward along the outside of the thrust rod 31. The two form opposite relative movements and do not interfere with each other.

[0093] During the lowering or raising of the sucker rod 2, the thrust rod 31 may move slightly up and down due to the slight sway of the sucker rod 2, while the thrust cylinder 42 can maintain a stable driving rhythm under the control of the hydraulic cylinder 41. The relative sliding ability of the two ensures that they can maintain the stability of their respective functions under dynamic working conditions.

[0094] In one embodiment, the hydraulic cylinder 41 drives the thrust cylinder 42 to perform intermittent up-and-down reciprocating motions. Through the continuous thrust of the thrust cylinder 42 on the claw seat device 51, the claw 52 gradually tightens and maintains the clamping force on the sucker rod 2.

[0095] The lower end of the thrust cylinder 42 is rigidly connected to the claw seat device 51 through a flange, transmitting the thrust of the hydraulic cylinder 41; when the thrust cylinder 42 moves downward, the claw seat device 51 moves downward synchronously, causing the claw 52 to retract towards the center along the inclined limiting groove 55 of the claw limiter 54; when the thrust cylinder 42 moves upward, the claw seat device 51 moves upward, and the claw 52 opens outward along the limiting groove 55.

[0096] The intermittent reciprocating motion makes the tightening process of the chuck 52 advance in a step-like manner, avoiding the squeezing deformation or scratches on the surface of the sucker rod 2 caused by instantaneous clamping. This is suitable for sucker rods made of softer materials and reduces the risk of damage.

[0097] The continuous thrust ensures stable positive pressure between the jaws 52 and the sucker rod 2. Combined with the anti-slip texture on the inner side of the jaws 52, it can effectively prevent the sucker rod 2 from slipping during lifting or lowering, and can maintain reliable clamping even in a vibrating environment.

[0098] If the chuck 52 has insufficient initial clamping force due to oil stains or slight deformation, the gap can be gradually eliminated by repeated pushes during intermittent downward movement to ensure that the final clamping force meets the standard. Compared with a single drive, this can reduce rework caused by failure to clamp properly in one go.

[0099] In one embodiment, an auxiliary unloading structure is also included. When the operation is completed, the lower end of the sucker rod 2 is supported by an external chuck device, and the hydraulic cylinder 41 drives the thrust cylinder 42 to move in the opposite direction, causing the chuck 52 to open along the trajectory of the chuck limiter 54, so that the sucker rod 2 is disengaged from the chuck.

[0100] When the sucker rod 2 finishes operation and needs to be unloaded, firstly, the external chuck device is moved to the lower end of the sucker rod 2, so that its jaws 52 grip the sucker rod 2 and bear the weight. At this time, the jaws 52 of the lifting clamp are still in a gripping state and only bear part of the auxiliary load. Then, the control system sends a reverse drive signal to the hydraulic cylinder 41, the piston rod of the hydraulic cylinder 41 retracts, and drives the thrust cylinder 42 to move upward. The thrust cylinder 42 drives the jaws 52 to slide upward along the inclined trajectory of the jaw limiter 54 through the jaw seat device 51. The jaws 52 open outward, and the opening range is greater than the diameter of the sucker rod 2. When the jaws 52 are completely separated from the surface of the sucker rod 2, the entire lifting clamp can be lifted upward, and the sucker rod 2 remains stably in place under the support of the chuck device, completing the unloading.

[0101] When the hydraulic cylinder 41 drives the jaws 52 to open, the weight of the sucker rod 2 is already borne by the chuck. The lifting clamp only needs to complete the jaw release action without having to resist the gravity of the sucker rod 2, which reduces friction and wear between the jaws 52 and the surface of the sucker rod 2 and extends the service life of the jaws 52. Regardless of whether the sucker rod 2 has a coupling 21, as long as the external chuck can provide stable support, the lifting clamp can complete the unloading by opening the jaws 52, regardless of the shape of the sucker rod 2, thus improving the versatility of the device.

[0102] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sucker rod clamp, characterized in that, include: The outer cylinder (1) and the inner cylinder (11) are fitted inside the outer cylinder (1), and the outer cylinder (1) and the inner cylinder (11) form the outer shell of the hanging clamp body; The thrust rod assembly (3) includes a thrust rod (31), a thrust baffle (32) and a thrust pin (33) located at the end of the thrust rod (31). The thrust baffle (32) and the thrust pin (33) are respectively adapted to two forms of the sucker rod (2) with and without coupling (21). The drive assembly (4) includes a hydraulic cylinder (41) and a thrust cylinder (42). The hydraulic cylinder (41) is connected to the thrust cylinder (42) and can drive the thrust cylinder (42) to reciprocate in the vertical direction. The claw assembly (5) includes a claw seat device (51), a claw (52), a claw housing (53), and a claw limiter (54). The claw seat device (51) is connected to the thrust cylinder (42). The claw (52) is mounted on the claw seat device (51). The claw housing (53) is fixed to the inner side of the inner cylinder (11). The claw limiter (54) is fixed inside the claw housing (53) and forms a limiting groove (55). The claw (52) can move along the trajectory of the limiting groove (55) to grab or release the sucker rod (2). The triggering component (6) includes a first triggering device (61) and a second triggering device (62). The first triggering device (61) is linked with the push rod (31) and is used to sense the movement of the push rod (31) and send a start signal to the hydraulic cylinder (41). The second triggering device (62) is linked with the push cylinder (42) and is used to sense the gripping state of the claw (52) and control the device to maintain the gripping state. The first triggering device (61) includes a trigger paddle (611), a paddle guide assembly (612), and a guide post (614). The guide post (614) is fixed to the upper end of the thrust rod (31). Vertical limiting grooves (43) are provided on both sides of the thrust cylinder (42). A guide groove (613) is provided on the paddle guide assembly (612). The guide post (614) passes through the vertical limiting groove (43) and the guide groove (613), and can drive the paddle guide assembly (612) and the trigger paddle (611) to rotate to trigger the first triggering device (61). The second triggering device (62) includes a trigger baffle (621) fixed above the thrust cylinder (42). When the pawl (52) grips the sucker rod (2), the thrust cylinder (42) drives the trigger baffle (621) to descend into the sensing range of the second triggering device (62), triggering the second triggering device (62) to send a holding signal. A spring (12) and a limiting washer (13) are provided between the outer cylinder (1) and the inner cylinder (11). The spring (12) is sleeved on the outside of the inner cylinder (11), and the limiting washer (13) is fixed to the outer wall of the inner cylinder (11). The lower wall of the outer cylinder (1) and the limiting washer (13) cooperate to form a vertical stroke limit to control the compression range of the spring (12).

2. The sucker rod clamp according to claim 1, characterized in that: The thrust baffle (32) is an annular plate structure, sleeved on the outside of the thrust pin (33), and the outer diameter of the thrust baffle (32) is larger than the outer diameter of the thrust pin (33) to adapt to the end triggering of the coupling (21) and the sucker rod (2) respectively.

3. The sucker rod clamp according to claim 1, characterized in that: The limiting groove (55) of the claw limiter (54) is inclined. When the thrust cylinder (42) drives the claw seat device (51) to move up and down, the claw (52) contracts or opens along the inclined trajectory to grasp or release the sucker rod (2).

4. A sucker rod clamp according to claim 1, characterized in that: The thrust rod (31) and the thrust cylinder (42) are connected by a limiting connection, and the two can slide relative to each other. When the thrust rod (31) is pushed upward by the sucker rod (2) or the coupling (21), the thrust cylinder (42) can independently reciprocate under the drive of the hydraulic cylinder (41).

5. A sucker rod clamp according to claim 1, characterized in that: The hydraulic cylinder (41) drives the thrust cylinder (42) to perform intermittent up-and-down reciprocating motion. Through the continuous thrust of the thrust cylinder (42) on the claw seat device (51), the claw (52) gradually tightens and maintains the clamping force on the sucker rod (2).

6. A sucker rod clamp according to claim 1, characterized in that: It also includes an auxiliary unloading structure. When the operation is finished, the lower end of the sucker rod (2) is supported by an external chuck device. The hydraulic cylinder (41) drives the thrust cylinder (42) to move in the opposite direction, causing the chuck (52) to open along the trajectory of the chuck limiter (54), so that the sucker rod (2) is disengaged from the chuck.

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