An automatic sucker rod back-up tong

Abstract

The present invention relates to the technical field of oilfield workover tools, and particularly relates to an automatic sucker rod back clamp, which includes a sliding body in the shape of a rectangular strip. A fixed slide rail arm that can move back and forth along the length direction of the sliding body is provided on the side surface of the sliding body. A reset mechanism is connected between the side surface of the fixed slide rail arm and the first end of the sliding body; a clamp slide sleeve that can move back and forth along the length direction of the sliding body is sleeved on the sliding body. The clamp slide sleeve is arranged on the side of the fixed slide rail arm away from the reset mechanism. A linear driver is provided between the clamp slide sleeve and the first end of the sliding body. The two ends of the linear driver are respectively fixedly connected to the clamp slide sleeve and the first end of the sliding body for driving the clamp slide sleeve to move on the sliding body. The beneficial effect of the present invention is that under the drive of the linear driver, the clamp slide sleeve linearly moves on the sliding body, thereby realizing the opening and closing of the first side jaw and the second side jaw, and thus realizing the clamping and loosening of the sucker rod, and the clamping and loosening of the sucker rod can be automatically controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield workover tools, and particularly to an automatic sucker rod back-up tongs. Background Art

[0002] Currently, most of the mechanized operations of sucker rods in oilfields use traditional hydraulic large tongs for sucker rods. The back-up tongs and the main tongs are in a linkage mode and cannot be independently controlled. Their motion control cannot accurately control the movement, and the reliability is poor. They adopt a complex climbing roller structure, which is complex, heavy, and huge in structure, not easy to transport and integrate, and seriously affects the integration, automation, and intelligence of the make-up and break-out functions. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an automatic sucker rod back-up tongs with a simple structure, low cost, high reliability, and capable of realizing automatic control.

[0004] The technical solution for the present invention to solve the above technical problems is as follows: An automatic sucker rod back-up tongs includes a sliding body in the shape of a rectangular strip. On one side of the sliding body in the length direction, a first tong part is fixedly provided, and a first side tong mouth is provided on the side of the first tong part. On the side of the sliding body away from the first tong part, a fixed slide rail arm that can move back and forth along the length direction of the sliding body is provided. One end of the fixed slide rail arm is slidably connected to the sliding body, and a reset mechanism is connected between the side of the fixed slide rail arm and the first end of the sliding body. A clamp card sliding sleeve that can move back and forth along the length direction of the sliding body is sleeved on the sliding body. The clamp card sliding sleeve is arranged on the side of the fixed slide rail arm away from the reset mechanism. A second tong part is fixedly provided on the clamp card sliding sleeve, and a second side tong mouth is provided on the side of the second tong part. The first side tong mouth and the second side tong mouth are arranged opposite to each other. A linear driver is provided between the clamp card sliding sleeve and the first end of the sliding body. The two ends of the linear driver are respectively fixedly connected to the clamp card sliding sleeve and the first end of the sliding body to drive the clamp card sliding sleeve to move on the sliding body.

[0005] The beneficial effects of the present invention are as follows: Driven by the linear driver, the clamp card sliding sleeve linearly moves on the sliding body, thereby realizing the opening and closing of the first side tong mouth and the second side tong mouth, and thus realizing the clamping and loosening of the sucker rod. Since the linear driver can be remotely controlled or automatically set, the automatic control of the clamping and loosening of the sucker rod can be realized; the control is accurate and the reliability is high; by setting the reset mechanism, the initial position when the first side tong mouth and the second side tong mouth are opened can be ensured to remain unchanged.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Further, a T-shaped head is fixedly provided at the end of the fixed slide rail arm, a T-shaped groove extending along the length direction of the slide body is provided on the slide body, and the T-shaped head is slidably arranged in the T-shaped groove.

[0008] The beneficial effect of adopting the above further scheme is that the sliding connection between the fixed slide rail arm and the slide body is realized through the T-shaped head and the T-shaped groove, avoiding the separation of the fixed slide rail arm from the slide body and ensuring the stability after assembly.

[0009] Further, the reset mechanism includes a reset spring, a spring guide rod and an adjusting limit member. A baffle is fixedly provided at the first end of the slide body. The reset spring is sleeved on the spring guide rod. One end of the spring guide rod is fixedly connected to the side surface of the fixed slide rail arm, and the other end slides through and extends out of the baffle and then is connected to the adjusting limit member. One end of the reset spring is fixedly connected to the side surface of the fixed slide rail arm, and the other end of the reset spring is fixedly connected to the baffle.

[0010] The beneficial effect of adopting the above further scheme is that the reset mechanism can ensure that the initial positions of the first side jaw and the second side jaw when they open remain unchanged. Specifically, during the opening process of the first side jaw and the second side jaw, the baffle moves away from the fixed slide rail arm under the action of the reset spring until it fits with the adjusting limit member, and then the clamping slide sleeve continues to open and move away from the fixed slide rail arm under the action of the linear actuator until the linear actuator fully extends; during the closing process of the first side jaw and the second side jaw, the slide body always fits with the adjusting limit member under the action of the reset spring until the clamping slide sleeve moves to fit with the fixed slide rail arm, and then the body 7 moves towards the fixed slide rail arm under the action of the linear driving body until the first side jaw and the second side jaw are closed; during the closing process, the positions of the first side jaw and the second side jaw relative to the fixed slide rail arm both move relatively, enabling the clamping of the sucker rod by moving towards the sucker rod from both sides of the sucker rod, or when loosening, the first side jaw and the second side jaw move away from each other to achieve loosening; the initial positions of the first side jaw and the second side jaw when they open are determined by the fixed slide rail arm, ensuring that the initial positions during opening and closing remain unchanged.

[0011] Further, the adjusting limit member is an adjusting nut, an external thread is provided on the spring guide rod, and the adjusting nut is threadedly connected to the spring guide rod.

[0012] The beneficial effect of adopting the above further scheme is that the adjusting limit member adopts an adjusting nut, and is adjustably connected to the spring guide rod by a threaded connection, which is convenient for adjusting the position of the adjusting limit member. On the one hand, it can limit the spring guide rod from slipping out of the slide body, and on the other hand, it can adjust the adjusting limit member according to the opening requirement of the first side jaw and the second side jaw to realize adjustable opening distance; the reset spring is always in a compressed state, so that there is always a separation tendency between the baffle and the fixed slide rail arm.

[0013] Furthermore, a square sliding hole for the sliding body to pass through is provided on the clamping sliding sleeve, and the sliding body is slidably arranged in the square sliding hole.

[0014] The beneficial effect of adopting the above further scheme is that a square sliding hole matching the shape of the sliding body is arranged on the clamping sliding sleeve, which is convenient for the directional movement of the sliding body and the clamping sliding sleeve.

[0015] Furthermore, a first mounting seat is fixedly provided on the side of the clamping sliding sleeve away from the second clamping part, a second mounting seat is fixedly provided on the first end of the sliding body, the linear driver is arranged between the first mounting seat and the second mounting seat, and both ends of the linear driver are respectively connected with the first mounting seat and the second mounting seat.

[0016] The beneficial effect of adopting the above further scheme is that the installation of the linear driver is facilitated through the arrangement of the first mounting part and the second mounting part.

[0017] Furthermore, both the first mounting seat and the second mounting seat are hinge seats, and both ends of the linear driver are respectively connected with the first mounting seat and the second mounting seat through hinge shafts.

[0018] The beneficial effect of adopting the above further scheme is that both the first mounting seat and the second mounting seat adopt hinge seats, and the linear driver is installed through hinge shafts, which is convenient for installation and disassembly.

[0019] Furthermore, the second mounting seat is arranged on the side surface of the first end of the sliding body, and extension parts extending away from the sliding body are provided on the upper parts of both the first mounting seat and the second mounting seat, and the hinge shaft is arranged on the extension parts.

[0020] The beneficial effect of adopting the above further scheme is that the arrangement of the extension parts can avoid mutual obstruction between the installation of the linear driver and the installation of the fixed slide rail arm. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the opening of the first side jaw and the second side jaw in an automatic sucker rod back clamp of the present invention;

[0022] Figure 2 It is a partial cross-sectional view when the first side jaw and the second side jaw of an automatic sucker rod back clamp of the present invention are opened;

[0023] Figure 3 It is a schematic diagram of the connection structure between the fixed slide rail arm and the sliding body of the present invention;

[0024] Figure 4 It is a schematic diagram of the closing of the first side jaw and the second side jaw in an automatic sucker rod back clamp of the present invention;

[0025] Figure 5 This is a schematic dorsal view of the closing of the first side jaw and the second side jaw in an automatic sucker rod back clamp of the present invention.

[0026] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0027] 1. Adjusting limit member; 2. Spring guide rod; 3. Return spring; 4. Linear actuator; 5. Fixed slide rail arm; 5.1 T-shaped head; 6. Clamp slide sleeve; 6.1 Second side jaw; 6.2 First mounting seat; 6.3 Square slide hole; 7. Slide body; 7.1 First side jaw; 7.2 Second mounting seat; 7.3 T-shaped groove; 7.4 Baffle; 7.4.1 Through hole; 8. Hinge shaft. Specific embodiments

[0028] The principles and features of the present invention will be described below in conjunction with the attached drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0029] As Figures 1 to 5 shown, an embodiment of the present invention includes a slide body 7 in the shape of a rectangular bar. A first jaw portion is fixedly provided on a side surface of the slide body 7 in one length direction, and a first side jaw 7.1 is provided on a side edge of the first jaw portion; a fixed slide rail arm 5 that can move back and forth along the length direction of the slide body 7 is provided on a side surface of the slide body 7 away from the first jaw portion. One end of the fixed slide rail arm 5 is slidably connected to the slide body 7, and a reset mechanism is connected between a side surface of the fixed slide rail arm 5 and a first end of the slide body 7.

[0030] As Figure 2 、 Figure 3 shown, in this embodiment, a T-shaped head 5.1 is fixedly provided at an end of the fixed slide rail arm 5, and a T-shaped groove 7.3 extending along the length direction of the slide body 7 is provided on the slide body 7. The T-shaped head 5.1 is slidably arranged in the T-shaped groove 7.3. The sliding connection between the fixed slide rail arm 5 and the slide body 7 is realized through the T-shaped head 5.1 and the T-shaped groove 7.3, avoiding the fixed slide rail arm 5 from detaching from the slide body 7 and ensuring the stability after assembly.

[0031] Specifically, as Figure 1 、 Figure 2As shown, the reset mechanism includes a reset spring 3, a spring guide rod 2, and an adjusting limit member 1. A baffle 7.4 is fixedly provided at the first end of the slider 7. The reset spring 3 is sleeved on the spring guide rod 2. One end of the spring guide rod 2 is fixedly connected to the side surface of the fixed slide rail arm 5, and the other end slides through and extends out of the baffle 7.4 and then is connected to the adjusting limit member 1. Specifically, a through hole 7.4.1 for the spring guide rod 2 to pass through is provided on the baffle 7.4, and the through hole 7.4.1 is larger than the cross-section of the spring guide rod 2 to ensure that there is no friction between the spring guide rod 2 and the through hole 7.4.1, thereby avoiding damage to the structure. One end of the reset spring 3 is fixedly connected to the side surface of the fixed slide rail arm 5, and the other end of the reset spring 3 is fixedly connected to the baffle 7.4. The adjusting limit member 1 is an adjusting nut, an external thread is provided on the spring guide rod 2, and the adjusting nut is threadedly connected to the spring guide rod 2. The adjusting limit member 1 is an adjusting nut and is adjustably connected to the spring guide rod 2 by a threaded connection, which is convenient for adjusting the position of the adjusting limit member 1. On the one hand, it can limit the spring guide rod 2 from disengaging from the slider 7, and on the other hand, it can adjust the adjusting limit member 1 according to the opening requirement of the first side jaw 7.1 and the second side jaw 6.1 to realize adjustable opening distance; the reset spring 3 is always in a compressed state, so that there is always a separation tendency between the baffle 7.4 and the fixed slide rail arm 5.

[0032] Preferably, as Figure 1 shown, a clamp slide sleeve 6 that can move back and forth along the length direction of the slider 7 is sleeved on the slider 7. Specifically, a square slide hole 6.3 for the slider 7 to pass through is provided on the clamp slide sleeve 6, and the slider 7 is slidably arranged in the square slide hole 6.3. A square slide hole 6.3 matching the shape of the slider 7 is provided on the clamp slide sleeve 6, which is convenient for the directional movement of the slider 7 and the clamp slide sleeve 6. The clamp slide sleeve 6 is arranged on the side of the fixed slide rail arm 5 away from the reset mechanism and will not disengage from the slider 7 under the action of the linear drive 4. A second clamping part is fixedly provided on the clamp slide sleeve 6, and a second side jaw 6.1 is provided on the side edge of the second clamping part. The first side jaw 7.1 and the second side jaw 6.1 are arranged opposite to each other; a linear drive 4 is provided between the clamp slide sleeve 6 and the first end of the slider 7. Both ends of the linear drive 4 are fixedly connected to the clamp slide sleeve 6 and the first end of the slider 7 respectively to drive the clamp slide sleeve 6 to move on the slider 7. The linear drive 4 is arranged parallel to the slider 7. Specifically, the linear drive direction of the linear drive 4 is the same as the length direction of the T-shaped groove 7.3.

[0033] In the embodiment of the present invention, as Figure 4As shown in the figure, a first mounting seat 6.2 is fixedly provided on the side of the clamping slide sleeve 6 away from the second clamping part. A second mounting seat 7.2 is fixedly provided at the first end of the sliding body 7. The linear drive 4 is arranged between the first mounting seat 6.2 and the second mounting seat 7.2. The two ends of the linear drive 4 are respectively connected to the first mounting seat 6.2 and the second mounting seat 7.2. Both the first mounting seat 6.2 and the second mounting seat 7.2 are hinge seats. The two ends of the linear drive 4 are respectively connected to the first mounting seat 6.2 and the second mounting seat 7.2 through a hinge shaft 8. By installing the linear drive 4 through the hinge shaft 8, the installation and disassembly are convenient. The second mounting seat 7.2 is arranged on the side surface of the first end of the sliding body 7, and extension parts extending away from the sliding body 7 are provided on the upper parts of both the first mounting seat 6.2 and the second mounting seat 7.2. The hinge shaft 8 is arranged on the extension parts. The arrangement of the extension parts can prevent the installation of the linear drive 4 and the installation of the fixed slide rail arm 5 from blocking each other.

[0034] Working principle: The sliding body 7 and the clamping slide sleeve 6 can be driven by the linear drive 4 to realize the opening and closing of the first side jaw 7.1 and the second side jaw 6.1. When the linear drive 4 extends, the sliding body 7 and the clamping slide sleeve 6 are separated, so that the first side jaw 7.1 and the second side jaw 6.1 open and separate. When the linear drive 4 retracts, the sliding body 7 and the clamping slide sleeve 6 approach, so that the first side jaw 7.1 and the second side jaw 6.1 approach and close, thereby realizing the clamping of the sucker rod. During the opening and closing process of the first side jaw 7.1 and the second side jaw 6.1, the reset device can always ensure that the initial positions of the first side jaw 7.1 and the second side jaw 6.1 remain unchanged when they open; during the opening process of the first side jaw 7.1 and the second side jaw 6.1, the sliding body 7 will first move away from the fixed slide rail arm 5 under the action of the reset spring 3 until it fits with the adjusting limit member 1, and then the clamping slide sleeve 6 will continue to open and move away from the fixed slide rail arm 5 under the action of the linear drive 4 until the linear drive 4 fully extends; during the closing process of the first side jaw 7.1 and the second side jaw 6.1, the sliding body 7 will always fit with the adjusting limit member 1 under the action of the reset spring 3 until the clamping slide sleeve 6 moves to fit with the fixed slide rail arm 5, and then the sliding body 7 moves towards the fixed slide rail arm 5 under the action of the linear drive 4 until the first side jaw 7.1 and the second side jaw 6.1 close.

[0035] The back clamp of the present invention mainly has two actions, closing and clamping, and opening and resetting. The actions are implemented as follows:

[0036] Closing and clamping action: When the back clamp is in the open state and the centers of the jaws at the front ends of the sliding body 7 and the clamping slide sleeve 6 coincide with the center of the wrench square of the sucker rod, the fixed slide rail arm 5 remains fixed. The linear drive 4 drives the sliding body 7 and the clamping slide sleeve 6 to approach the wrench square of the sucker rod until the jaws of the sliding body 7 and the clamping slide sleeve 6 clamp the wrench square of the sucker rod (seeFigure 4 and Figure 5 schematic diagram of the closed state).

[0037] Opening and resetting action: When the back clamp is in the closed clamping state, the linear driver 4 drives the sliding body 7 and the clamp sliding sleeve 6 to separate their jaws until they are fully opened, and then return to the initial position under the action of the reset device (see Figure 1 and Figure 2 schematic diagram of the open state).

[0038] The structure of the present invention is simple. Driven by the linear driver 4, the clamp sliding sleeve 6 linearly moves on the sliding body 7, and the sliding body 7 linearly moves relative to the fixed slide rail arm 5, so as to realize the opening and closing of the first side jaw 7.1 and the second side jaw 6.1, thereby realizing the clamping and loosening of the sucker rod. Since the linear driver 4 can be remotely controlled or automatically set, the automatic control of the clamping and loosening of the sucker rod can be realized; the control is accurate and the reliability is high; by setting the reset mechanism, the initial positions of the first side jaw 7.1 and the second side jaw 6.1 when they are opened can be ensured to remain unchanged.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0040] In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0043] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic sucker rod back clamp, characterized in that, It includes a sliding body (7) in the shape of a rectangular bar. On one side of the sliding body (7) in a length direction, a first clamping part is fixedly provided, and a first side clamping jaw (7.1) is provided on the side of the first clamping part; on the side of the sliding body (7) away from the first clamping part, a fixed slide rail arm (5) that can move back and forth along the length direction of the sliding body (7) is provided. One end of the fixed slide rail arm (5) is slidably connected to the sliding body (7), and the side of the fixed slide rail arm (5) is connected to the first end of the sliding body (7) through a reset mechanism; a clamping slide sleeve (6) that can move back and forth along the length direction of the sliding body (7) is sleeved on the sliding body (7). The clamping slide sleeve (6) is arranged on the side of the fixed slide rail arm (5) away from the reset mechanism. A second clamping part is fixedly provided on the clamping slide sleeve (6), and a second side clamping jaw (6.1) is provided on the side of the second clamping part. The first side clamping jaw (7.1) and the second side clamping jaw (6.1) are arranged opposite to each other; a linear drive (4) is provided between the clamping slide sleeve (6) and the first end of the sliding body (7). The two ends of the linear drive (4) are respectively fixedly connected to the clamping slide sleeve (6) and the first end of the sliding body (7) for driving the clamping slide sleeve (6) to move on the sliding body (7).

2. The automatic sucker rod back clamp according to claim 1, characterized in that, A T-shaped head (5.1) is fixedly provided at the end of the fixed slide rail arm (5). A T-shaped groove (7.3) extending along the length direction of the sliding body (7) is provided on the sliding body (7). The T-shaped head (5.1) is slidably arranged in the T-shaped groove (7.3).

3. The automatic sucker rod back clamp according to claim 1, characterized in that, The reset mechanism includes a reset spring (3), a spring guide rod (2) and an adjustment limiting part (1). A baffle (7.4) is fixedly provided at the first end of the sliding body (7). The reset spring (3) is sleeved on the spring guide rod (2). One end of the spring guide rod (2) is fixedly connected to the side of the fixed slide rail arm (5), and the other end slides through and extends out of the baffle (7.4) and then is connected to the adjustment limiting part (1). One end of the reset spring (3) is fixedly connected to the side of the fixed slide rail arm (5), and the other end of the reset spring (3) is fixedly connected to the baffle (7.4).

4. The automatic sucker rod back clamp according to claim 3, characterized in that, The adjustment limiting part (1) is an adjustment nut. The spring guide rod (2) is provided with an external thread, and the adjustment nut is threadedly connected to the spring guide rod (2).

5. The automatic sucker rod back clamp according to any one of claims 1 to 4, characterized in that, A square slide hole (6.3) for the sliding body (7) to pass through is provided on the clamping slide sleeve (6). The sliding body (7) is slidably arranged in the square slide hole (6.3).

6. The automatic sucker rod back clamp according to any one of claims 1 to 4, characterized in that, A first mounting seat (6.2) is fixedly provided on the side of the clamping slide sleeve (6) away from the second clamping part. A second mounting seat (7.2) is fixedly provided at the first end of the sliding body (7). The linear drive (4) is arranged between the first mounting seat (6.2) and the second mounting seat (7.2). The two ends of the linear drive (4) are respectively connected to the first mounting seat (6.2) and the second mounting seat (7.2).

7. The automatic sucker rod back clamp according to claim 6, characterized in that, Both the first mounting seat (6.2) and the second mounting seat (7.2) are hinge seats, and two ends of the linear actuator (4) are respectively connected to the first mounting seat (6.2) and the second mounting seat (7.2) through hinge shafts (8).

8. The automatic sucker rod back clamp according to claim 7, characterized in that, The second mounting seat (7.2) is arranged on a side surface of a first end of the sliding body (7), and extension parts extending away from the sliding body (7) are arranged on upper parts of both the first mounting seat (6.2) and the second mounting seat (7.2), and the hinge shaft (8) is arranged on the extension parts.

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