Clamp head locking mechanism of hydraulic power clamp

Abstract

The utility model relates to the technical field of hydraulic tongs, in particular to a tong head locking mechanism of hydraulic power tongs, which comprises an X-shaped frame, a hydraulic power tong head locking mechanism and a hydraulic power tong head locking mechanism. Tooth grooves are formed in the side faces, close to each other, of the first arc-shaped plate and the second arc-shaped plate, a rotatable transmission gear is arranged between the first arc-shaped plate and the second arc-shaped plate in a meshed mode, a locking gear is fixedly connected to the outer side of the transmission gear, the locking plate is arc-shaped, and tooth grooves meshed with the locking gear are formed in the inner wall of the locking plate. The device has the beneficial effects that the first arc-shaped plate and the second arc-shaped plate are fixedly installed at the rear ends of the two movable arms correspondingly, the rotatable transmission gear is installed between the first arc-shaped plate and the second arc-shaped plate, the driving piece drives the locking plate to slide and limits rotation of the locking gear, and the transmission gear can limit the first arc-shaped plate and the second arc-shaped plate; therefore, mechanical locking of the X-shaped frame is achieved, and the situation that the hydraulic cylinder cannot clamp a workpiece due to insufficient pressure of the hydraulic cylinder is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic tongs, and particularly relates to a jaw locking mechanism of a hydraulic power tong. Background Technique

[0002] A hydraulic power tong is a mechanical tool for screwing on and off pipe threads by using the power of a workover rig, which can greatly reduce the labor intensity of workover workers and avoid or reduce the occurrence of injury accidents.

[0003] In the prior art, most hydraulic power tongs are of an X-shaped structure. The X-shaped frame is driven by a hydraulic cylinder to rotate, and the front end of the X-shaped frame is used to clamp the workpiece to be clamped, so as to facilitate the stable progress of subsequent work.

[0004] However, at present, after the hydraulic power tong clamps the workpiece, the hydraulic cylinder needs to continuously maintain a high-pressure state. When the sealing performance of the hydraulic cylinder itself fails and the pressure of the hydraulic cylinder drops, it is difficult to continuously clamp the workpiece. Therefore, the utility model provides a jaw locking mechanism of a hydraulic power tong to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a jaw locking mechanism of a hydraulic power tong to solve the problems put forward in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A jaw locking mechanism of a hydraulic power tong, the jaw locking mechanism of the hydraulic power tong includes:

[0007] An X-shaped frame, the X-shaped frame includes two movable arms that intersect with each other and are rotatably connected in the middle. A hydraulic cylinder for driving the X-shaped frame to deform is arranged between the two movable arms;

[0008] Arc-shaped plates I and II are respectively fixedly connected to the rear ends of the two movable arms and are concentric. Tooth grooves are formed on the mutually close side surfaces of the arc-shaped plates I and II, and a rotatable transmission gear is meshed between the two. A locking gear is fixedly connected to the outside of the transmission gear, the diameter of the locking gear is larger than that of the transmission gear, and a slidable locking plate is arranged on the outside of the locking gear. The locking plate is arc-shaped and a tooth groove meshing with the locking gear is formed on the inner wall.

[0009] Preferably, a clamping end is fixedly arranged at the front end of the movable arm. Connecting shafts are fixedly installed at both ends of the movable arm. The hydraulic cylinder is rotatably connected to the movable arm through the connecting shaft. Two hydraulic cylinders are provided and symmetrically distributed on both sides of the X-shaped frame. The middle parts of the two movable arms are rotatably connected through a central shaft.

[0010] Preferably, connecting plates are movably sleeved on the outer sides of both ends of the central shaft, a gear shaft is fixedly arranged between the transmission gear and the locking gear, and the gear shaft is movably and penetratingly connected with the connecting plates.

[0011] Preferably, a driving member is fixedly installed on the surface of the connecting plate, and the movable end of the driving member is fixedly connected to the middle of the locking plate and drives the locking plate to slide along the length direction of the connecting plate.

[0012] Preferably, a guiding sliding groove is formed in the surface of the connecting plate along its own length direction, a limiting post is fixedly connected to the surface of the locking plate, and the limiting post movably penetrates through the inner cavity of the guiding sliding groove.

[0013] Preferably, the centers of the first arc-shaped plate and the second arc-shaped plate coincide with the central shaft, reinforcing rib plates are fixedly connected to the mutually remote side surfaces of the first arc-shaped plate and the second arc-shaped plate, avoiding holes are formed through the surfaces of the two movable arms, and the first arc-shaped plate and the second arc-shaped plate respectively movably penetrate through the two avoiding holes.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] In the utility model, the first arc-shaped plate and the second arc-shaped plate are fixedly installed at the rear ends of the two movable arms respectively and are concentric, a rotatable transmission gear is installed between the first arc-shaped plate and the second arc-shaped plate, both the first arc-shaped plate and the second arc-shaped plate are meshed with the transmission gear, a locking gear with a larger diameter is fixedly connected to the outside of the transmission gear, a locking plate is arranged outside the locking gear, the locking plate is arc-shaped and a tooth groove meshed with the locking gear is formed in the inner wall, the locking plate is driven to slide by a driving member, when the hydraulic cylinder extends and drives the X-shaped frame to deform and stably clamp the workpiece, the driving member is used to drive the locking plate to slide and limit the rotation of the locking gear, and then the transmission gear can limit the first arc-shaped plate and the second arc-shaped plate, so as to realize the mechanical locking of the X-shaped frame and avoid the situation that the hydraulic cylinder cannot clamp the workpiece due to insufficient self-pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional schematic diagram of the overall structure of the utility model;

[0017] Figure 2 is an exploded schematic diagram of the X-shaped frame structure of the utility model;

[0018] Figure 3 is a schematic diagram of the structural cooperation among the first arc-shaped plate, the second arc-shaped plate and the transmission gear of the utility model;

[0019] Figure 4 is a three-dimensional schematic diagram of the structures of the transmission gear and the locking gear of the utility model;

[0020] Figure 5Schematic diagram of the connection structure of the locking plate and the connecting plate of the present utility model.

[0021] In the figure: 1. Movable arm; 101. Clamping end; 102. Connecting shaft; 2. Hydraulic cylinder; 3. First arc-shaped plate; 4. Second arc-shaped plate; 5. Transmission gear; 51. Gear shaft; 6. Locking gear; 7. Connecting plate; 71. Guide chute; 8. Locking plate; 81. Limit post; 9. Driving member; 10. Avoidance hole; 11. Central axis; 12. Reinforcing rib plate. Specific implementation mode

[0022] In order to clearly and completely describe the purpose, technical solution of the present utility model, and make the advantages more clear and understandable, the following further details the embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present utility model, rather than all of the embodiments, and are only used to explain the embodiments of the present utility model, not to limit the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present utility model.

[0023] Embodiment 1, please refer to Figures 1-5 , the present utility model provides a technical solution: a clamping head locking mechanism of a hydraulic power tong, including: an X-shaped frame.

[0024] Specifically, the X-shaped frame includes two movable arms 1 that intersect with each other and are rotatably connected in the middle. A hydraulic cylinder 2 for driving the deformation of the X-shaped frame is arranged between the two movable arms 1. As Figure 1 shown, when the hydraulic cylinder 2 extends, the hydraulic cylinder 2 can drive the X-shaped frame to fold, and the front end of the X-shaped frame is used to clamp the workpiece. On the contrary, when the hydraulic cylinder 2 shortens, the X-shaped frame no longer clamps the workpiece;

[0025] Secondly, a first arc-shaped plate 3 and a second arc-shaped plate 4 are respectively fixedly connected to the rear ends of the two movable arms 1 and are concentric. Tooth grooves are provided on the mutually close side surfaces of the first arc-shaped plate 3 and the second arc-shaped plate 4, and a rotatable transmission gear 5 is meshed between them. As Figure 3 shown, when the X-shaped frame folds or unfolds and deforms, the first arc-shaped plate 3 and the second arc-shaped plate 4 always rotate and move in the opposite direction, and drive the rotation of the transmission gear 5 through meshing with the transmission gear 5. A locking gear 6 is fixedly connected to the outside of the transmission gear 5. The diameter of the locking gear 6 is larger than that of the transmission gear 5. A slidable locking plate 8 is arranged outside the locking gear 6. The locking plate 8 is arc-shaped and a tooth groove meshing with the locking gear 6 is provided on the inner wall. As Figure 3As shown, when the locking plate 8 slides to engage with the locking gear 6, the locking plate 8 can lock and limit the locking gear 6 to prevent the locking gear 6 from rotating, thereby locking the transmission gear 5. When the transmission gear 5 is locked and cannot rotate, the first arc-shaped plate 3 and the second arc-shaped plate 4 cannot rotate or move. That is to say, by positioning the rotation of the locking plate 8, the mechanical locking of the X-shaped frame can be achieved. The meshing transmission of the transmission gear 5 to the first arc-shaped plate 3 (or the second arc-shaped plate 4) is a labor-saving transmission, and the diameter of the locking gear 6 is larger than that of the transmission gear 5. When the locking plate 8 restricts the rotation of the locking gear 6, it can also restrict the rotation of the transmission gear 5 in a labor-saving manner, which ensures that the locking plate 8 of the device can lock the X-shaped frame more conveniently and labor-savingly.

[0026] To supplement the description of the structure of the X-shaped frame, the present application also has a clamping end 101 fixedly arranged at the front end of the movable arm 1. A rubber pad is bonded to the inner wall of the clamping end 101, which is convenient for clamping the workpiece and can also reduce the damage to the surface of the workpiece. Connecting shafts 102 are fixedly installed at both ends of the movable arm 1. The hydraulic cylinder 2 is rotationally connected to the movable arm 1 through the connecting shafts 102, so as to ensure that the X-shaped frame can be deformed when the hydraulic cylinder 2 expands and contracts. Two hydraulic cylinders 2 are provided and symmetrically distributed on both sides of the X-shaped frame to ensure more uniform force application. The middle parts of the two movable arms 1 are rotationally connected through a central shaft 11.

[0027] To prevent the transmission gear 5 from shifting in position, the present application also has connecting plates 7 movably sleeved on the outer sides of both ends of the central shaft 11. A gear shaft 51 is fixedly arranged between the transmission gear 5 and the locking gear 6. The gear shaft 51 is movably penetrated through the connecting plate 7. The setting of the connecting plate 7 is used to position the central shaft 11 and the transmission gear 5 to prevent the transmission gear 5 from shifting in position and affecting the meshing with the first arc-shaped plate 3 (or the second arc-shaped plate 4).

[0028] To drive the sliding of the locking plate 8, the present application also has a driving member 9 fixedly installed on the surface of the connecting plate 7. The movable end of the driving member 9 is fixedly connected to the middle part of the locking plate 8 and drives the locking plate 8 to slide along the length direction of the connecting plate 7. The setting of the driving member 9 is used to drive the sliding of the locking plate 8, thereby realizing the locking or unlocking of the locking plate 8 to the locking gear 6.

[0029] To prevent the locking plate 8 from shifting in position, the present application also has a guiding chute 71 opened on the surface of the connecting plate 7 along its own length direction. A limiting post 81 is fixedly connected to the surface of the locking plate 8. The limiting post 81 movably penetrates through the inner cavity of the guiding chute 71, as Figure 5As shown, the limit post 81 can only slide along the length direction of the guiding chute 71 within the inner cavity of the guiding chute 71. The mutual extrusion between the limit post 81 and the inner side wall of the guiding chute 71 can prevent the locking plate 8 from shifting in the width direction of the connecting plate 7.

[0030] In order to prevent the movement of the first arc-shaped plate 3 and the second arc-shaped plate 4 from being blocked, the centers of the first arc-shaped plate 3 and the second arc-shaped plate 4 of the present application coincide with the central axis 11. Reinforcing ribs 12 are fixedly connected to the mutually remote side surfaces of the first arc-shaped plate 3 and the second arc-shaped plate 4 to improve the strength of the first arc-shaped plate 3 and the second arc-shaped plate 4 themselves and prevent themselves from deforming and disengaging from the transmission gear 5. Avoidance holes 10 are respectively formed through the surfaces of the two movable arms 1. The first arc-shaped plate 3 and the second arc-shaped plate 4 respectively pass through the two avoidance holes 10 movably to prevent the movement of the first arc-shaped plate 3 and the second arc-shaped plate 4 from being blocked.

[0031] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A clamp head locking mechanism for a hydraulic power tong, characterized in that: The clamp head locking mechanism of the hydraulic power tongs comprises: An X-shaped frame, the X-shaped frame comprising two movable arms (1) that cross each other and are rotatably connected in the middle, and a hydraulic cylinder (2) for driving the X-shaped frame to deform is provided between the two movable arms (1); The rear ends of the two movable arms (1) are respectively fixedly connected with an arc plate 1 (3) and an arc plate 2 (4), and the two are concentric. The side surfaces of the arc plate 1 (3) and the arc plate 2 (4) close to each other are provided with tooth grooves, and a rotatable transmission gear (5) is arranged in meshing relationship between the two. A locking gear (6) is fixedly connected to the outer side of the transmission gear (5). The diameter of the locking gear (6) is larger than that of the transmission gear (5). A slidable locking plate (8) is arranged on the outer side of the locking gear (6). The locking plate (8) is arc-shaped and has a tooth groove in the inner wall that meshes with the locking gear (6).

2. The clamp head locking mechanism of the hydraulic power tongs according to claim 1, characterized in that: The front end of the movable arm (1) is fixedly provided with a clamping end (101), and both ends of the movable arm (1) are fixedly installed with connecting shafts (102). The hydraulic cylinder (2) is rotatably connected to the movable arm (1) via the connecting shaft (102). Two hydraulic cylinders (2) are provided and symmetrically distributed on both sides of the X-shaped frame. The middle parts of the two movable arms (1) are rotatably connected via a central shaft (11).

3. The clamp head locking mechanism of the hydraulic power tongs according to claim 2, characterized in that: Connecting plates (7) are movably sleeved on the outer sides of both ends of the central shaft (11), a gear shaft (51) is fixedly arranged between the transmission gear (5) and the locking gear (6), and the gear shaft (51) is movably connected to the connecting plates (7).

4. The clamp head locking mechanism of the hydraulic power tongs according to claim 3, characterized in that: A driving member (9) is fixedly mounted on the surface of the connecting plate (7), and a movable end of the driving member (9) is fixedly connected to the middle of the locking plate (8) and drives the locking plate (8) to slide along the length direction of the connecting plate (7).

5. The clamp head locking mechanism of the hydraulic power tongs according to claim 4, characterized in that: The surface of the connecting plate (7) is provided with a guide slot (71) along its length direction, and the surface of the locking plate (8) is fixedly connected to a limiting column (81), and the limiting column (81) movably penetrates the inner cavity of the guide slot (71).

6. The clamp head locking mechanism of the hydraulic power tongs according to claim 1, characterized in that: The centers of the arc plate 1 (3) and the arc plate 2 (4) coincide with the central axis (11); the side surfaces of the arc plate 1 (3) and the arc plate 2 (4) that are away from each other are fixedly connected with reinforcing ribs (12); the surfaces of the two movable arms (1) are penetrated with avoidance holes (10); the arc plate 1 (3) and the arc plate 2 (4) are respectively movable through the two avoidance holes (10).

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