A brake mechanism for a sleeve power tong master tong head and a master tong head

Abstract

This utility model provides a braking mechanism for the main jaw head of a casing power pliers, relating to the field of oil drilling technology. The main jaw head is integrally fitted onto the outer circumference of the oil casing. The main jaw head is connected to the main jaw plate frame. A pin-shaft braking mechanism for braking the main jaw plate frame is provided on the main jaw housing. The pin-shaft braking mechanism includes a brake pin, a spring, a support, and a brake stop. The support is fixedly installed on the main jaw housing, the spring is sleeved on the brake pin, the brake pin is installed in the shaft hole of the support, and the brake stop is fixedly installed on the main jaw plate frame. This utility model has a simple structure. By setting up a pin-shaft braking mechanism, it solves the problems of incomplete braking with a single brake band, incomplete positioning of the jaw plate rollers, and insufficient torque for upper and lower buckling. At the same time, a spring return structure is adopted to prevent malfunction, thereby improving the reliability of the non-marking casing pliers and ensuring the normal use of the non-marking casing power pliers.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling technology, specifically to a braking mechanism and a main tong head for a casing power tong. Background Technology

[0002] Currently, casing wrenches are commonly used for casing operations in oil and gas fields. Some casing wrenches include a main wrench and a back wrench, with the back wrench holding the casing and the main wrench driving the casing for coupling. The currently used pure brake band braking non-marking casing power wrenches have some problems in actual use. For example, the single brake band braking may not be complete, causing the jaw rollers to not climb properly, resulting in insufficient torque for coupling. Additionally, conventional casing wrenches use metal toothed jaw plates to hold and drive the casing, but because the metal toothed jaw plates press into the casing surface, they leave permanent tooth marks. For special oil and gas fields using corrosion-resistant casing, it is required that no marks be left on the casing surface after casing operations, striving to minimize damage to the casing during casing operations. Utility Model Content

[0003] The purpose of this utility model is to provide a braking mechanism and a main clamp head for a power pliers for casing, so as to solve one and more problems mentioned in the background art.

[0004] To achieve the above objectives, this application provides a braking mechanism for the main jaw head of a casing power pliers. The main jaw head is integrally fitted onto the outer circumference of the oil casing. The main jaw head is connected to the main jaw plate frame. A pin-shaft braking mechanism for braking the main jaw plate frame is provided on the main jaw housing. The pin-shaft braking mechanism includes a brake pin, a spring, a support, and a brake stop. The support is fixedly installed on the main jaw housing and engages with the brake drum of the main jaw plate frame. The spring is fitted onto the brake pin, which is installed in the shaft hole of the support. The brake stop is fixedly installed on the main jaw plate frame.

[0005] As a preferred feasible approach, a brake band assembly is also included, which is mounted on the housing of the master caliper head and engages with the brake drum of the master caliper jaw plate frame.

[0006] As a preferred feasible method, the tail of the brake pin is tapered, with a taper angle α of 1° to 30°.

[0007] On the other hand, a main jaw head is also provided, which includes two main jaw moving jaw plate assemblies and a main jaw stationary jaw plate assembly, both of which are connected to the main jaw plate frame. The main jaw stationary jaw plate assembly is located between the two main jaw moving jaw plate assemblies. When the main jaw stationary jaw plate assembly and the main jaw moving jaw plate assembly grip the oil casing, the included angle β of the jaw plate rollers of the main jaw stationary jaw plate assembly and the main jaw moving jaw plate assembly is in the range of 100-115 degrees.

[0008] As a preferred implementation, the main jaw jaw head also includes a notched gear disposed on the main jaw jaw head. The inner surface of the notched gear is configured as a curved surface, serving as a ramp for the rollers on the main jaw moving jaw plate assembly. The jaw plate rollers of each main jaw moving jaw plate assembly are pressed on the corresponding ramp. The two main jaw moving jaw plate assemblies and the main jaw stationary jaw plate assembly are respectively connected to the main jaw plate frame by jaw plate pins.

[0009] As a preferred feasible method, each main jaw moving jaw plate assembly and main jaw stationary jaw plate assembly is fixedly connected with a non-indentation jaw plate, which is evenly arranged along the outer circumference of the oil casing and fits against the outer circumference of the oil casing.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This invention features a reasonable and simple structure. Based on the existing pure brake band braking non-marking sleeve power pliers, a pin-shaft braking mechanism is added. When the torque for uncoupling is insufficient, the pin-shaft braking mechanism is operated to fully brake the jaw plate frame, forcing the jaw plate rollers to continue climbing. The jaw plate drives the toothed plate, generating greater positive pressure on the outer circle of the sleeve, thus providing sufficient torque for uncoupling and solving problems such as incomplete braking with a single brake band. At the same time, a spring return structure is adopted to prevent malfunctions, thereby improving the reliability of the non-marking sleeve pliers and ensuring their normal use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main jaw of a power sleeve clamp with a pin-shaft braking mechanism;

[0013] Figure 2 This is a schematic diagram of the main jaw of a power sleeve clamp with a pin-shaft braking mechanism;

[0014] Figure 3 This is a schematic diagram of the brake pin in a braking mechanism for the main jaw of a power pliers for casing.

[0015] Figure 4 This is a diagram showing the included angle of the jaw plate rollers in the main jaw of a sleeve power pliers with a pin-shaft braking mechanism. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] It should be noted that all uses of "first", "second", "third" and "fourth" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first", "second", "third" and "fourth" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0018] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0019] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] like Figure 1-4 As shown, this utility model provides a main pliers head for a sleeve power pliers with a pin-shaft braking mechanism. The housing of the main pliers head is provided with a brake band assembly and a pin-shaft braking mechanism for braking the main pliers jaw frame. The pin-shaft braking mechanism 6 includes a brake pin 62, a spring 63, a support 64, and a brake stop 65. The brake band assembly 14 is installed on the housing of the main pliers head, and the support 64 is fixed to the housing with bolts. The brake band assembly engages with the brake drum of the main pliers jaw frame 13. The spring 63 is sleeved on the brake pin 62, which is installed in the shaft hole of the support 63. The brake stop 65 is fixedly installed on the main pliers jaw frame 13. The pin-shaft braking mechanism is used to control the brake pin 62 to contact the brake stop 65 to fully brake the main pliers jaw frame 13 when the upper and lower torque is insufficient.

[0021] It should be noted that the tail of the brake pin 62 has a tapered structure with a taper angle α of 1° to 30°. The tapered structure at the tail of the brake pin facilitates the separation of the brake pin from the brake stop.

[0022] like Figure 3As shown in the diagram, the pin-shaft braking mechanism extends from the center of the main clamp, causing the main clamp jaw plate frame to rotate. When the brake stop 65 on the main clamp jaw plate frame contacts the brake pin 62, the main clamp jaw plate frame 13 is blocked and stops rotating, thus fully braking the jaw plate frame. This forces the jaw plate rollers to climb the slope again, and the jaw plate drives the toothed plate, generating greater positive pressure on the outer diameter of the sleeve, thereby providing sufficient torque for the sleeve to engage and disengage.

[0023] Both main jaw moving jaw plate assemblies 12 and main jaw stationary jaw plate assemblies 11 are hinged to the main jaw plate frame 13 via jaw plate pins 15. The main jaw stationary jaw plate assembly 11 is located between the two main jaw moving jaw plate assemblies 12. Both the main jaw stationary jaw plate assembly 11 and the moving jaw plate assembly 12 are hinged to the main jaw plate frame 13 via jaw plate pins 15. When the main jaw stationary jaw plate assembly 11 and the main jaw moving jaw plate assembly 12 grip the oil casing, the included angle α of the jaw plate rollers of the main jaw stationary jaw plate assembly 11 and the main jaw moving jaw plate assembly 12 is in the range of 100-115 degrees. Therefore, the included angle α of the jaw plate rollers in the three-jaw-plate structure of the main clamp of this application is greater than that in the two-jaw-plate structure. This allows for a more effective conversion of the positive pressure of the jaw plates on the sleeve into frictional force, ensuring the clamping force of the clamping force of the sleeve clamp without indentation. While ensuring smooth uncoupling on the sleeve, the working pressure of the hydraulic motor can be adjusted more rationally, reducing the stress on the jaw plates in the three-jaw-plate structure, thereby reducing wear and tear, decreasing the frequency of jaw plate replacement, and saving sleeve operation time. The appropriate magnitude of the positive pressure of the jaw plates on the sleeve reduces deformation at the uncoupling points, improves the quality of uncoupling, and ensures the airtightness of the tubing string. This structure ensures normal production while generating considerable economic benefits.

[0024] The main jaw jaw also includes a notched gear 14 disposed on the main jaw jaw. The inner surface of the notched gear 14 is curved, serving as a ramp 17 for the jaw rollers 16 of the main jaw moving jaw assembly 12 to climb. The jaw rollers 16 of each main jaw moving jaw assembly 12 are pressed on the corresponding ramp 17. The two main jaw moving jaw assemblies 12 and the main jaw fixed jaw assembly 11 are respectively connected to the main jaw jaw frame 13 through jaw pins 15.

[0025] It should be noted that each main jaw moving jaw plate assembly 12 and main jaw stationary jaw plate assembly 11 is fixedly connected with a non-indentation jaw plate 8. The non-indentation jaw plates 8 are evenly arranged along the outer circumference of the oil casing and fit against the outer circumference of the oil casing. It should be noted that the non-indentation jaw plates are made of braided resin composite material with built-in copper wire, with a Shore hardness of D90-D95 and a static sliding friction coefficient with steel ≥0.6. Such jaw plates have both high strength and good toughness, and at the same time have a high coefficient of friction, so that the effective positive pressure of the non-indentation jaw plates on the casing is large enough. Under the premise of ensuring smooth uncoupling on the casing, the wear of the jaw plates is reduced, the number of jaw plate replacements is reduced, the casing operation time is saved, and considerable economic benefits are generated.

[0026] In summary, the present invention features a non-marking power pliers mounted on the outer circumference of the oil casing 5. The inner surface of the notch gear in the pliers head is designed as a curved surface, forming a ramp for the jaw rollers to climb. The jaw rollers of the two main pliers moving jaw plate assemblies press against the ramp. Non-marking jaw plates are fixedly connected to the jaw plates of each main pliers moving jaw plate assembly and fixed jaw plate assembly. When the notch gear rotates, the main pliers jaw plate frame is braked by the brake band assembly, creating a speed difference between the main pliers jaw plate frame and the notch gear. This causes the jaw rollers of the main pliers moving jaw plate assembly to climb the ramp, and the two main pliers moving jaw plate assemblies swing towards the oil casing. Then, they push the upper oil casing to press against the main pliers fixed jaw plate assembly until the three jaw plates are in contact with the outer circumference of the upper oil casing. When the back pliers have clamped the lower casing, the main pliers drive the upper casing to rotate, completing the casing uncoupling.

[0027] Furthermore, the main jaw plate holder employs a dual-braking system, adding a pin-shaft braking mechanism to the original band brake. When the upper and lower torque is insufficient, operating the pin-shaft braking mechanism fully brakes the jaw plate holder, forcing the jaw plate rollers to continue climbing. The jaw plate drives the toothed plates, generating greater positive pressure on the outer circumference of the bushing, thus ensuring sufficient torque for upper and lower torque. A spring-return structure is also employed, which is compact and prevents malfunctions. Therefore, the added pin-shaft braking mechanism solves the problems of incomplete band braking, insufficient roller climbing, and insufficient upper and lower torque, thereby improving the reliability of the non-marking bushing pliers and ensuring their normal operation.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A braking mechanism for the main jaw of a power pliers for casing, characterized in that, The main clamp head is fitted onto the outer circumference of the oil casing (5); the main clamp head is connected to the main clamp jaw plate frame (13), and the main clamp housing (66) is provided with a pin braking mechanism for braking the main clamp jaw plate frame. The pin braking mechanism (6) includes a brake pin (62), a spring (63), a support (64), and a brake stop (65). The support (64) is fixedly installed on the main clamp housing (66), the spring (63) is fitted onto the brake pin (62), the brake pin (62) is installed in the shaft hole of the support (64), and the brake stop (65) is fixedly installed on the main clamp jaw plate frame (13).

2. The braking mechanism for the main jaw of a power pliers for casing according to claim 1, characterized in that, It also includes a brake band assembly (61), which is mounted on the housing of the main caliper head and engages with the brake drum of the main caliper jaw plate frame (13).

3. The braking mechanism for the main jaw of a power pliers for casing according to claim 1, characterized in that, The tail of the brake pin (62) is a tapered structure with a taper angle α of 1° to 30°.

4. A main jaw of a power pliers for casing with a braking mechanism, characterized in that, The braking mechanism for the main jaw of a power tong for casing is described in any one of claims 1-3. The main jaw includes two moving jaw plate assemblies (12) and a fixed jaw plate assembly (11), both of which are connected to the jaw plate frame (13). The fixed jaw plate assembly (11) is located between the two moving jaw plate assemblies (12). Both the fixed jaw plate assembly (11) and the moving jaw plate assembly (12) are hinged to the jaw plate frame (13) by jaw plate pins (15). When the fixed jaw plate assembly (11) and the moving jaw plate assembly (12) grip the oil casing, the included angle β of the jaw plate rollers of the fixed jaw plate assembly (11) and the moving jaw plate assembly (12) is in the range of 100-115 degrees.

5. The main jaw of a power pliers for casings with a braking mechanism according to claim 4, characterized in that, The main jaw jaw head also includes a notched gear (14) disposed on the main jaw jaw head. The inner surface of the notched gear (14) is configured as a curved surface, serving as a ramp for the rollers to climb on the main jaw moving jaw plate assembly (12). The jaw plate rollers of each main jaw moving jaw plate assembly (12) are pressed on the corresponding ramp. The two main jaw moving jaw plate assemblies (12) and the main jaw stationary jaw plate assembly (11) are respectively connected to the main jaw plate frame (13) by jaw plate pins (15).

6. The main jaw of a power pliers for casings with a braking mechanism according to claim 4, characterized in that, Each main jaw moving jaw plate assembly (12) and main jaw stationary jaw plate assembly (11) is fixedly connected with a non-indentation jaw plate (8), which is evenly arranged along the outer circumference of the oil casing and fits against the outer circumference of the oil casing.

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