Self-locking tong head

Abstract

The invention relates to the technical field of drilling tools, in particular to a self-locking tong head which comprises a tong body, a first gate and a second gate are rotationally installed at the two ends of the tong body, power pieces enabling the first gate and the second gate to rotate around the tong body are arranged on the first gate and the second gate respectively, a locking hook is rotationally installed on the second gate through a pin shaft, and a notch is formed in the first gate. The locking hook is connected with a power piece for driving the second gate through a linkage piece, when the first gate and the second gate are closed and locked, the locking hook is clamped into the notch under the combined action of the power piece and the linkage piece, so that the first gate and the second gate are locked, and when the first gate and the second gate are opened and unlocked, the locking hook is clamped into the notch under the combined action of the power piece and the linkage piece. The locking hook rotates earlier than the second gate through the delay assembly so that the locking hook can be rotated out of the notch. Through the combined action that the power piece is matched with the linkage piece, the effect of sequentially driving the locking hook and the second gate to be opened and closed is achieved, and the tong head structure is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling tools, and particularly relates to a self-locking jaw head. Background Art

[0002] During the process of lifting drill pipes with a lifting collar for drilling (and similar equipment for lifting drill pipes), there are relatively high requirements for preventing falling. For the main gate of the jaw head, a locking mechanism is equipped. Traditional lifting collar equipment generally uses a manual locking device. With the progress of automation technology, the requirements for the automation level of lifting collar equipment are also getting higher and higher. Due to the relatively strict space requirements and explosion-proof requirements of the lifting collar, the existing automated jaw head locking mechanisms mainly have the following problems:

[0003] Generally, two sets of driving devices are designed for the jaw head. One set is used for opening and closing the main gate, and the other set is used for locking and unlocking the locking mechanism, resulting in a complex structure of the jaw head. In addition, due to the space limitation of the jaw head and the limitation of the explosion-proof requirements of the well site, setting up an independent locking and unlocking mechanism makes the structure of the locking mechanism extremely complex. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the opening and closing of the main gate and the locking and unlocking of the locking mechanism respectively adopt independent driving devices, resulting in a complex structure of the jaw head.

[0005] To solve the above technical problem, the present invention adopts the following technical solutions:

[0006] First, a self-locking jaw head is provided, which includes a jaw body, a first main gate, a second main gate, a locking hook, a linkage member, and a delay component;

[0007] Power components for respectively rotating the first main gate and the second main gate around the jaw body are provided on both the first main gate and the second main gate. The locking hook is rotatably connected to the second main gate through a pin shaft. A notch is formed on the first main gate. The locking hook is connected to the power component for driving the second main gate through the linkage member and the delay component;

[0008] During the process of closing and locking the first main gate and the second main gate, under the combined action of the power component and the linkage member, the locking hook can be engaged into the notch to lock the first main gate and the second main gate;

[0009] During the process of opening and unlocking the first main gate and the second main gate, under the combined action of the power component and the linkage member, the locking hook can rotate prior to the second main gate through the delay component, so that the locking hook rotates out of the notch.

[0010] Further, the delaying component includes a connecting plate and a first pin. The connecting plate is rotatably connected to the linkage member and the power member driving the second large door respectively. An irregular-shaped hole is formed on the connecting plate, and the first pin is fixedly arranged on the second large door and penetrates into the irregular-shaped hole;

[0011] During the rotation of the connecting plate, the first pin can move relative to the connecting plate or the first pin can rotate synchronously under the abutment of the connecting plate, so that the locking hook and the second large door can move successively.

[0012] Further, the irregular-shaped hole includes a connected first hole and a second hole. The first pin includes a connected first rod and a second rod. The first rod is located in the first hole, the second rod is located in the second hole, and the first rod is arranged on the second large door;

[0013] During the rotation of the connecting plate, the second rod can move relatively in the second hole or drive the first rod to rotate synchronously under the abutment of the wall of the second hole.

[0014] When the second rod moves relatively in the second hole, the rotation of the connecting plate cannot transmit its torque to the first rod to drive the second large door to rotate. Only the linkage member can drive the locking hook to move. After the side of the second rod abuts against the wall of the second hole, if a rotational force is continuously applied to the connecting plate, since the second rod cannot move relatively in the second hole and can only rotate synchronously with the second hole, that is, the connecting plate, the torque can be transmitted to the second large door, and then drive the second large door to rotate, thus achieving the effect that the locking hook moves first and then the second large door rotates.

[0015] Further, the first hole is configured as a circular hole, the first rod is configured as a cylindrical shape adapted to the first hole, and the first rod can rotate in the first hole;

[0016] The second hole is configured as a kidney-shaped hole. The second hole extends along the circumference of the first hole. Both ends of the second hole extend to the connecting plate to respectively form a first stop surface and a second stop surface. The second rod is configured as a strip shape. The second rod can move along the circumference of the first hole in the kidney-shaped hole. When the second rod abuts against the first stop surface, the second large door opens. When the second rod abuts against the second stop surface, the second large door closes.

[0017] Further, the linkage member includes a linkage rod and an elastic member. One end of the linkage rod is rotatably connected to the connecting plate, and a second pin is arranged at the other end. A compensation hole is formed on the locking hook, and the second pin is located in the compensation hole, so that the locking hook can rotate relative to the linkage rod;

[0018] During the process of closing and locking the first large door and the second large door, the elastic member can provide an elastic force for the locking hook to rotate around the pin shaft and towards the notch.

[0019] Further, the compensation hole is configured as an arc-shaped hole, and the second pin is located on the rotation path of the compensation hole when the locking hook rotates around the pin shaft.

[0020] Further, the elastic member is a spring, and the spring is arranged between the locking hook and the second large door.

[0021] Further, the shape of the locking hook is adapted to the shape of the notch. By adapting the shape of the locking hook to the shape of the notch, the contact between the two is more sufficient, and the locking structure is more compact and reasonable.

[0022] Further, the front end of the locking hook is configured as an arc-shaped surface. Since the front end of the locking hook needs to approach the side wall of the notch during rotation, the arc-shaped front end can ensure that the locking hook can cooperate with the notch in place and avoid interference between the locking hook and the first large door.

[0023] Further, the power member is an oil cylinder.

[0024] The present invention has the following beneficial effects:

[0025] First, the present invention uses a locking hook to achieve a locking effect during the closing process of the first large door and the second large door, preventing the first large door and the second large door from opening by themselves, ensuring that the clamp head is more stable when clamping the drill tool, and having a better use effect;

[0026] Second, by using the connecting plate and the linkage member, the locking hook can be opened first when the clamp head is opened, ensuring the smooth opening of the first large door and the second large door and the smooth use of the clamp head;

[0027] Third, under the action of the pin and the arc-shaped hole, the locking hook has a certain buffering effect, which can avoid jamming when the first large door and the second large door are opened and closed, ensure a better use effect of the clamp head, and can adapt to different situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0029] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0030] Figure 2 is a cross-sectional view of the present invention;

[0031] Figure 3 is a schematic structural diagram of the first large door of the present invention;

[0032] Figure 4 is a schematic structural diagram of the locking hook of the present invention;

[0033] Figure 5 is a schematic structural diagram of the linkage rod of the present invention;

[0034] Figure 6 is a schematic structural diagram of the second large door of the present invention;

[0035] Figure 7 is a schematic structural diagram of the connecting plate of the present invention;

[0036] Figure 8 is a schematic structural diagram of the first pin of the present invention;

[0037] Figure 9 is a schematic structural diagram of the unlocking process of the jaw head of the present invention;

[0038] Figure 10 is a schematic structural diagram of the open state of the jaw head of the present invention;

[0039] Figure 11 is a schematic structural diagram of the closing process of the jaw head of the present invention;

[0040] Figure 12 is a schematic structural diagram of the closed state of the jaw head of the present invention.

[0041] Reference numerals: 1, jaw head housing; 11, locking hook; 12, compensation hole; 13, second pin; 14, spring; 15, linkage rod; 16, second large door; 161, pin hole; 162, shaft hole; 18, connecting plate; 182, special-shaped hole; 1821, first hole; 1822, second hole; 183, first stop surface; 184, second stop surface; 2, first large door; 22, notch; 3, pliers body; 4, first pin; 41, first rod; 42, second rod; 6, oil cylinder. Detailed implementation manners

[0042] For better explaining the present invention for easy understanding, the present invention will be described in detail below with reference to the accompanying drawings through specific implementation manners.

[0043] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indications will also change accordingly.

[0044] In addition, in the present invention, descriptions such as "first", "second", etc. are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, terms such as "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 can be the communication inside two components or the interaction relationship between two components, 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 circumstances.

[0046] The present invention provides a self-locking jaw head, as Figure 1 and Figure 2 shown, which includes a jaw head housing 1. A jaw body 3 is arranged inside the jaw head housing 1. A first large door 2 and a second large door 16 are respectively rotatably installed at both ends of the jaw body 3. Among them, the first large door 2, the second large door 16 and the jaw body 3 enclose a cavity, and bushings of different specifications can be assembled in the cavity to meet the requirements of different drill tools.

[0047] Among them, the first large door 2 and the second large door 16 are respectively rotatably connected to the jaw head housing 1 through power components. Optionally, the power component can be an oil cylinder 6. The first large door 2 is driven to rotate by the telescopic movement of the oil cylinder 6 connected to the first large door 2, and the second large door 16 is driven to rotate by the telescopic movement of the oil cylinder 6 connected to the second large door 16, so as to realize the opening and closing of the jaw head.

[0048] As Figure 1 and Figure 4 shown, in order to ensure the locking effect when the first large door 2 and the second large door 16 are closed, a locking hook 11 is arranged at the docking part of the first large door 2 and the second large door 16. When the first large door 2 and the second large door 16 are closed, the locking hook 11 locks the docking part of the first large door 2 and the second large door 16 to prevent it from opening by itself, ensuring that the jaw head is more firm and reliable during operation.

[0049] As Figure 2 and Figure 3As shown, in this embodiment, the locking hook 11 is rotatably connected to the second main door 16. A notch 22 is formed at the position corresponding to the locking hook 11 on the first main door 2. In the locked state, the locking hook 11 is clamped in the notch 22. At this time, the first main door 2 and the second main door 16 cannot be opened by themselves, realizing the locked state of the tong head. When it is necessary to open, the locking hook 11 rotates to move out of the notch 22. At this time, the oil cylinder 6 can drive the first main door 2 and the second main door 16 to open, realizing the opening of the tong head.

[0050] As Figure 9 and Figure 10 shown, in order to simplify the structure of the tong head and drive the tong head main door and the locking hook 11 respectively only by a set of driving devices for opening and closing the tong head main door, without additionally setting a driving device for opening and closing the locking hook 11, realizing the linkage between the tong head main door and the locking hook 11, this self-locking tong head further includes a linkage member and a delaying component. During the process of the first main door 2 and the second main door 16 closing and locking, under the combined action of the power member and the linkage member, the locking hook 11 can be clamped into the notch 22 to lock the first main door 2 and the second main door 16. During the process of the first main door 2 and the second main door 16 opening and unlocking, under the combined action of the power member and the linkage member, the locking hook 11 can rotate prior to the second main door 16 through the delaying component, so that the locking hook 11 rotates out of the notch 22.

[0051] Specifically, as Figure 7 and Figure 8 shown, the delaying component includes a first pin 4 and a connecting plate 18. The first pin 4 is fixedly arranged on the second main door 16. A special-shaped hole 182 is formed on the connecting plate 18. The first pin 4 passes through the special-shaped hole 182. The first pin 4 includes a connected first rod 41 and a second rod 42. The special-shaped hole 182 includes a connected first hole 1821 and a second hole 1822. The first rod 41 is arranged in the first hole 1821, and the second rod 42 is arranged in the second hole 1822. Among them, the first hole 1821 is configured as a circular hole, the first rod 41 is a cylindrical rod that rotates with the first hole 1821, the second hole 1822 is configured as a waist-shaped hole, the second hole 1822 extends along the circumferential direction of the first hole 1821, and two ends of the second hole 1822 respectively form a first stop surface 183 and a second stop surface 184. One side of the connecting plate 18 is rotatably connected to the corresponding oil cylinder 6, and the other side is in transmission connection with the linkage member.

[0052] As Figure 6 shown, a pin hole 161 for installing the first pin 4 and a shaft hole 162 for installing a pin shaft are formed on the second main door 16. The first pin 4 is fixedly installed in the pin hole 161. When the first pin 4 rotates under the action of the connecting plate 18, it can drive the second main door 16 to rotate synchronously relative to the tong body 3. By arranging a pin shaft in the shaft hole 162, the locking hook 11 can rotate on the second main door 16 around the pin shaft.

[0053] like Figure 2 As shown, in the process of opening the pliers head, the side surface of the second rod 42 abuts against the second stop surface 184, and the locking hook 11 is engaged in the notch 22, as shown in FIG. Figure 3 As shown, as the oil cylinder 6 contracts, the connecting plate 18 is driven to rotate around the first rod 41, and the second rod 42 gradually rotates in the second hole 1822 to the side and abuts against the first stop surface 183. At this time, the second door 16 is always in a closed state. Since the rotation of the connecting plate has a pulling effect on the linkage member, the end of the linkage member away from the connecting plate pulls the locking hook 11 out of the notch 22. As the oil cylinder 6 continues to contract, the connecting plate 18 drives the first pin 4 to rotate synchronously. Since the first pin 4 is fixed on the second door 16, the second door 16 is opened, and the first door 2 is driven to open by the contraction of another oil cylinder 6, so that the drilling tool can be placed in the clamp head.

[0054] Furthermore, Figure 2 and Figure 5 As shown, the linkage member includes a linkage rod 15 and an elastic member. One end of the linkage rod 15 is rotatably connected to the connecting plate, and the other end is provided with a second pin 13. A compensation hole 12 is formed on the locking hook 11, and the second pin 13 is located in the compensation hole 12. The elastic member is a spring 14, which is arranged between the locking hook 11 and the second gate 16, and the spring 14 is in a compressed state, so that the spring 14 has a tendency to push the locking hook 11 to clamp in the notch 22. When the oil cylinder 6 contracts, the connecting plate 18 pulls the linkage rod 15, and the linkage rod 15 pulls the locking hook 11 to rotate on the second gate 16 around the pin shaft, so that the locking hook 11 is separated from the notch 22, and the spring 14 is further compressed. By providing the compensation hole 12 that cooperates with the second pin 13, the locking hook 11 can rotate relative to the linkage rod 15.

[0055] Furthermore, Figure 4 and Figure 11 As shown, since the front end of the locking hook 11 gradually approaches the side wall of the notch 22 during the process of rotating to dock with the notch 22, the front end of the locking hook 11 is constructed as an arc-shaped surface that can transition smoothly, which not only makes the structure of the locking hook 11 locked in the notch 22 more compact, but also avoids interference between the locking hook 11 and the first gate 2.

[0056] like Figure 11 and Figure 12As shown, during the process of closing the jaw head, the first large door 2 can be first reset under the action of its corresponding oil cylinder 6. After that, the oil cylinder 6 corresponding to the second large door 16 extends, the connecting plate 18 rotates in the reverse direction, and the side surface of the second rod 42 gradually changes from the state of abutting against the first stop surface 183 to abutting against the second stop surface 184. At this time, the first rod 41 does not rotate synchronously with the connecting plate. The linkage rod 15 moves under the action of the connecting plate 18, so that the locking hook 11 rotates first. When the side surface of the second rod 42 abuts against the second stop surface 184, when the oil cylinder 6 continues to extend, the connecting plate 18 moves synchronously with the first pin 4, and the second large door 16 gradually approaches the first large door 2 and completes the docking. At this time, the second pin 13 is located at the middle position of the compensation hole 12 due to the pushing action of the linkage rod 15, and the compressed spring 14 restores part of its elastic deformation and can push the locking hook 11 to rotate around the pin shaft. At the same time, the position of the second pin 13 in the compensation hole 12 changes with the rotation of the locking hook 11 until the locking hook 11 is clamped in place with the notch, realizing the closing and locking of the jaw head.

[0057] It should be understood that the above description of the specific embodiments of the present invention is only for explaining the technical route and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the above specific embodiments. Any changes or modifications made within the scope of the claims of the present invention should be covered by the protection scope of the present invention.

Claims

1. A self-locking clamp head, characterized in that, It includes a pliers body (3), a first main door (2), a second main door (16), a locking hook (11), a linkage member and a delay component; Power components for respectively rotating the first main door (2) and the second main door (16) around the pliers body (3) are provided on both the first main door (2) and the second main door (16). The locking hook (11) is rotatably connected to the second main door (16) through a pin shaft. A notch (22) is formed on the first main door (2). The locking hook (11) is connected to the power component for driving the second main door (16) through the linkage member and the delay component; During the process of closing and locking the first main door (2) and the second main door (16), under the combined action of the power component and the linkage member, the locking hook (11) can be snapped into the notch (22) to lock the first main door (2) and the second main door (16); During the process of opening and unlocking the first main door (2) and the second main door (16), under the combined action of the power component and the linkage member, the locking hook (11) can rotate prior to the second main door (16) through the delay component, so that the locking hook (11) rotates out of the notch (22).

2. The self-locking pliers head according to claim 1, characterized in that, The delay component includes a connecting plate (18) and a first pin (4). The connecting plate (18) is respectively rotatably connected to the linkage member and the power component for driving the second main door (16). A special-shaped hole (182) is formed on the connecting plate (18). The first pin (4) is fixedly arranged on the second main door (16) and penetrates into the special-shaped hole (182); During the rotation of the connecting plate (18), the first pin (4) can move relative to the connecting plate (18) or the first pin (4) can rotate synchronously under the abutment of the connecting plate (18), so that the locking hook (11) and the second main door (16) can move successively.

3. The self-locking jaw according to claim 2, characterized in that, The special-shaped hole (182) includes a communicated first hole (1821) and a second hole (1822). The first pin (4) includes a connected first rod (41) and a second rod (42). The first rod (41) is located in the first hole (1821), the second rod (42) is located in the second hole (1822), and the first rod (41) is arranged on the second main door (16); During the rotation of the connecting plate (18), the second rod (42) can move relatively in the second hole (1822) or drive the first rod (41) to rotate synchronously under the abutment of the hole wall of the second hole (1822).

4. The self-locking jaw according to claim 3, characterized in that, The first hole (1821) is configured as a circular hole, the first rod (41) is configured as a cylindrical shape adapted to the first hole (1821), and the first rod (41) can rotate in the first hole (1821); The second hole (1822) is configured as an oval hole, the second hole (1822) extends circumferentially along the first hole (1821), and both ends of the second hole (1822) extend to the connecting plate (18) to respectively form a first stop surface (183) and a second stop surface (184). The second rod (42) is configured as a strip, and the second rod (42) can move circumferentially along the first hole (1821) within the oval hole. When the second rod (42) abuts against the first stop surface (183), the second large door (16) opens; when the second rod (42) abuts against the second stop surface (184), the second large door (16) closes.

5. A self-locking jaw according to any one of claims 1 to 4, characterized in that, The linkage member includes a linkage rod (15) and an elastic member. One end of the linkage rod (15) is rotatably connected to the connecting plate (18), and a second pin (13) is provided at the other end. A compensation hole (12) is formed on the locking hook (11), and the second pin (13) is located in the compensation hole (12) so that the locking hook (11) can rotate relative to the linkage rod (15). During the process of the first large door (2) and the second large door (16) closing and locking, the elastic member can provide an elastic force for the locking hook (11) to rotate around the pin shaft and towards the notch (22).

6. The self-locking jaw according to claim 5, characterized in that, The compensation hole (12) is configured as an arc-shaped hole, and the second pin (13) is located on the rotation path of the compensation hole (12) when the locking hook (11) rotates around the pin shaft.

7. A self-locking jaw according to claim 5, characterized in that, The elastic member is a spring (14), and the spring (14) is arranged between the locking hook (11) and the second large door (16).

8. A self-locking jaw according to any one of claims 1-4, characterized in that, The shape of the locking hook (11) is adapted to the shape of the notch (22).

9. A self-locking jaw according to any one of claims 1-4, characterized in that, The front end of the locking hook (11) is configured as an arc-shaped surface.

10. A self-locking jaw head according to any one of claims 1-4, characterized in that, The power member is an oil cylinder (6).

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