High-reliability hydraulic clamp holder

Abstract

The utility model discloses a high-reliability hydraulic clamp holder which comprises a gas spring, a sealing sleeve is arranged at the front end of the gas spring, a sealing bottom plate is arranged at the rear end of the gas spring, a piston is arranged in the gas spring, a connecting rod is arranged in the piston, the head end in the connecting rod penetrates through the sealing sleeve, an installation flange is arranged in the middle of the connecting rod in a surrounding mode, and four installation holes are evenly formed in the flange. Same pull rods are arranged in the mounting holes, a front mounting plate is fixed to the head ends of the pull rods in a threaded mode, symmetrical slip supports are arranged on the inner side of the front mounting plate, and slips are arranged in the slip supports. The clamp holder has the advantages that nitrogen / hydraulic double-fluid control is adopted, high-pressure nitrogen is filled at the beginning to push a piston to move, the clamp holder clamps a drill rod, constant clamping force is guaranteed, the clamping force is not affected by a power source, when the clamp holder needs to be loosened, high-pressure hydraulic oil is injected into an oil cavity, and the high-pressure hydraulic oil is injected into the oil cavity. The piston of the oil cylinder is pushed to move towards the rodless cavity, and the clamp holder is loosened; and the problem that the clamper fails when the hydraulic device leaks is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic clamps, in particular to a high-reliability hydraulic clamp. Background Technique

[0002] Existing drill pipe clamps are all realized by the way of clamping / loosening with an oil cylinder. However, if the hydraulic system leaks, the clamp will fail and cannot achieve the purpose of clamping. Content of the Utility Model

[0003] In view of the above deficiencies, the utility model adopts the following technical solutions:

[0004] A high-reliability hydraulic clamp includes a gas spring. A sealing sleeve is provided at the front end of the gas spring, and a sealing bottom plate is provided at the rear end of the gas spring. A piston is arranged inside the gas spring, and a connecting rod is arranged inside the piston. The head end of the connecting rod passes through the sealing sleeve. An installation flange is arranged around the middle part of the gas spring. Four installation holes are evenly distributed around the gas spring on the installation flange in a rectangular shape at the four corners. The same pull rod is arranged in each installation hole. The tail end of the pull rod is fixedly connected with a rear installation plate by threads, and the head end of the pull rod is fixedly connected with a front installation plate by threads. Symmetrical jaw supports are arranged on the inner side of the front installation plate, and jaws are arranged inside the jaw supports. The tail end of the jaw support is connected with the connecting rod.

[0005] Further, an air inlet nozzle is arranged on the inner side of the sealing bottom plate. A valve core is arranged inside the air inlet nozzle, and a plug is arranged inside the valve core. A sealing ring, a retaining ring and a locking ring are sequentially arranged around the sealing bottom plate from the inside to the outside. The outer side surface of the sealing bottom plate is attached to the rear installation plate. A fixing plate is arranged on the outer side of the rear installation plate. Corresponding threaded holes are arranged on the rear installation plate, the fixing plate and the sealing bottom plate. The rear installation plate, the fixing plate and the sealing bottom plate are fixedly connected by threads.

[0006] Further, a convex block is arranged at the tail of the connecting rod. The top of the convex block passes through the piston and a clamp is arranged around it. A retaining ring I is arranged around the upper layer of the top of the convex block, and a sealing ring I is arranged around the upper layer of the convex block on one side of the clamp.

[0007] Further, an oil seal ring, a guide ring, a buffer ring and a sealing ring II are sequentially arranged on the outer side of the piston from the head end to the tail end; sealing ring III and retaining ring II are sequentially arranged around the connecting rod on the inner side of the head end of the piston. An oil cavity is formed between the outer side wall of the head end of the piston and the barrel wall of the gas spring and the sealing sleeve. An oil inlet is arranged on the barrel wall of the gas spring at the corresponding position of the oil cavity. When the oil inlet is not in use, it is blocked by setting a plug.

[0008] Further, a hoop I, a lock ring I, a retaining ring III, and a sealing ring IV are sequentially arranged on the outer wall of the sealing sleeve from the head end to the tail end. A dust-proof ring is arranged at the head end of the inner wall of the sealing sleeve, and a rod seal is arranged at the tail end of the inner wall of the sealing sleeve. Two guide plates are arranged around the connecting rod between the dust-proof ring and the rod seal.

[0009] Further, grooves with shapes matching those of the retaining ring, retaining ring I, retaining ring II, and retaining ring III are provided at the set positions. A fixing plate is also arranged on the outer side of the front mounting plate. The front mounting plate and this fixing plate are thread-fixed to the slip chuck support through the same fixing structure as that of the rear mounting plate.

[0010] Further, limit blocks are arranged on both the upper and lower sides inside the slip chuck support. The slip is arranged between the limit blocks. A number of mounting grooves are provided in the slip, and a number of fixing blocks are sequentially arranged in the mounting grooves. A number of square pyramidal protrusions are evenly arranged on the surface of the fixing blocks, and the top of the square pyramid of the protrusions is ground flat.

[0011] The beneficial effects of the present utility model are as follows: The gripper of the present utility model adopts nitrogen / hydraulic double-fluid control. At the beginning, by filling with high-pressure nitrogen, the piston is pushed to move, thereby pushing the gripper to clamp the drill pipe, and a constant clamping force is ensured, and this clamping force is not affected by the power source. When it is necessary to release the gripper, high-pressure hydraulic oil is injected into the oil cavity, pushing the piston of the oil cylinder to move towards the rodless cavity direction, thereby releasing the gripper; effectively avoiding the problem that the gripper fails when the hydraulic device leaks. Description of the Drawings

[0012] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0013] Figure 2 is a schematic sectional structure diagram of the present utility model;

[0014] Figure 3 is a schematic diagram of the sealing bottom plate structure of the present utility model;

[0015] Figure 4 is a schematic diagram of the piston structure of the present utility model;

[0016] Figure 5 is a schematic diagram of the slip chuck support structure of the present utility model.

[0017] In the figure: 1 - gas spring, 10 - jaw, 101 - limit block, 102 - mounting groove, 103 - fixing block, 11 - sealing sleeve, 12 - sealing base plate, 13 - piston, 14 - connecting rod, 15 - mounting flange, 16 - pull rod, 17 - rear mounting plate, 18 - front mounting plate, 19 - jaw support, 21 - air inlet nozzle, 22 - valve core, 23 - plug, 24 - sealing ring, 25 - retaining ring, 26 - locking ring, 27 - fixing plate, 31 - convex block, 32 - clamp, 33 - retaining ring Ⅰ, 41 - oil seal ring, 42 - guide ring, 43 - buffer ring, 44 - sealing ring Ⅱ, 45 - sealing ring Ⅲ, 46 - retaining ring Ⅱ, 47 - oil cavity, 48 - oil inlet, 51 - clamp Ⅰ, 52 - locking ring Ⅰ, 53 - retaining ring Ⅲ, 54 - sealing ring Ⅳ, 55 - dust ring, 56 - rod seal, 57 - guide plate. Detailed implementation mode

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Combined with Figures 1 to 5 As shown in:

[0020] A highly reliable hydraulic gripper includes a gas spring 1. A sealing sleeve 11 is provided at the front end of the gas spring 1 for sealing the front end of the pneumatic spring 1. A clamp Ⅰ51, a lock ring Ⅰ52, a retaining ring Ⅲ53 and a sealing ring Ⅳ54 are successively arranged on the outer wall of the sealing sleeve 11 from the head end to the tail end, which can effectively ensure the sealing effect. A dust-proof ring 55 is provided at the head end of the inner wall of the sealing sleeve 11 to prevent dust from entering. A rod seal 56 is provided at the tail end of the inner wall of the sealing sleeve 11 to ensure the sealing of the connecting rod 14. Two guide plates 57 are arranged around the connecting rod 14 between the dust-proof ring 55 and the rod seal 56 for guiding the connecting rod 14. A sealing bottom plate 12 is provided at the rear end of the gas spring 1. A piston 13 is arranged inside the gas spring 1. A connecting rod 14 is arranged inside the piston 13. The head end of the connecting rod 14 passes through the sealing sleeve 11. An installation flange 15 is arranged around the middle of the gas spring 1 for facilitating the installation of the pull rod 16. Four installation holes are evenly distributed in a rectangular shape around the gas spring 1 on the installation flange 15. The same pull rod 16 is arranged in each installation hole. A rear installation plate 17 is fixed by threading at the tail end of the pull rod 16. A front installation plate 18 is fixed by threading at the head end of the pull rod 16. The latter is used to fix the collet support, and the former is used for rear-end fixation. Symmetric collet supports 19 are arranged inside the front installation plate 18 for clamping and supporting. A collet 10 is arranged inside the collet support 19 for clamping. The tail end of the collet support 19 is connected to the connecting rod 14, and the clamping force is provided by the push of the gas spring 1.

[0021] An air inlet nozzle 21 is arranged inside the sealing bottom plate 12. A valve core 22 is arranged inside the air inlet nozzle 21. A plug 23 is arranged inside the valve core 22 for filling high-pressure gas to provide the clamping force. A sealing ring 24, a retaining ring 25 and a lock ring 26 are successively arranged around the sealing bottom plate 12 from the inside to the outside, so that the rear end of the gas spring 1 is fully sealed. The outer side of the sealing bottom plate 12 is attached to the rear installation plate 17. A fixing plate 27 is arranged outside the rear installation plate 17 for strengthening the connection of the installation plate. Corresponding threaded holes are arranged on the rear installation plate 17, the fixing plate 27 and the sealing bottom plate 12 for threaded fixation. The rear installation plate 17, the fixing plate 27 and the sealing bottom plate 12 are fixedly connected by threading.

[0022] A convex block 31 is arranged at the tail of the connecting rod 14 for fixing on the piston 13. The top of the convex block 31 passes through the piston 13 and a clamp 32 is arranged around it. A retaining ring Ⅰ33 is arranged around the lower layer top of the convex block 31. A sealing ring Ⅰ34 is arranged around the upper layer of the convex block 31 on one side of the clamp 32 for ensuring the connection sealing between the connecting rod 14 and the piston 13.

[0023] An oil seal ring 41, a guide ring 42, a buffer ring 43 and a seal ring II 44 are sequentially arranged on the outside of the piston 13 from the head end to the tail end; a seal ring III 45 and a retaining ring II 46 are sequentially arranged on the inside of the head end of the piston 13 around the connecting rod 14, so that the sealing performance of the outer side of the piston is guaranteed, and an oil chamber 47 is formed between the outer wall of the head end of the piston 13, the cylinder wall of the gas spring 1 and the sealing sleeve 11, and an oil inlet 48 is arranged on the cylinder wall of the gas spring 1 at the corresponding position of the oil chamber 47 for the injection of hydraulic oil.

[0024] The positions of retaining ring 25, retaining ring I33, retaining ring II46 and retaining ring III53 are all provided with grooves that match their shapes to ensure their stability. A fixing plate 27 is also provided on the outside of the front mounting plate 18. The front mounting plate 18 and the fixing plate 27 are fixed to the cava support 19 through the same fixing structure threads as the rear mounting plate, and are both used for connection reinforcement.

[0025] Limit blocks 101 are provided on the upper and lower sides of the inner side of the slip support 19, and a clamping tile 10 is provided between the limit blocks 101. A plurality of mounting grooves 102 are provided in the clamping tile 10, and a plurality of fixing blocks 103 are provided in the mounting grooves 102 in sequence. A plurality of square cone-shaped protrusions are evenly provided on the surface of the fixing block 103, and the top of the square cone of the protrusion is ground flat. The height thereof can be adjusted to ensure that the friction force is improved during clamping.

[0026] Working principle:

[0027] The gas spring is inflated through the air inlet nozzle and then closed with a plug. The piston pushes the slip support under the push of gas, thereby reducing the distance between the symmetrically arranged slip supports. Through the action between the pull rod and the slip support, the clamping shoe clamps the drill pipe. The oil inlet is opened and hydraulic oil is filled in. The hydraulic oil pushes the piston backward, causing the connecting rod arranged in the piston to contract and the slip support supported by it to relax, thereby stopping the clamping action of the clamping shoe. This can effectively avoid the problem of being unable to clamp when the hydraulic oil leaks.

[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0029] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A highly reliable hydraulic gripper, characterized in that: It includes a gas spring (1). A sealing sleeve (11) is provided at the front end of the gas spring (1), and a sealing bottom plate (12) is provided at the rear end of the gas spring (1). A piston (13) is provided inside the gas spring (1), and a connecting rod (14) is provided inside the piston (13). The head end of the connecting rod (14) passes through the sealing sleeve (11). An installation flange (15) is provided around the middle of the gas spring (1). Four installation holes are evenly distributed in a rectangular shape around the gas spring (1) on the installation flange (15). The same pull rod (16) is provided in each of the installation holes. A rear installation plate (17) is fixed by threading at the tail end of the pull rod (16), and a front installation plate (18) is fixed by threading at the head end of the pull rod (16). Symmetrical jaw supports (19) are provided inside the front installation plate (18), and a jaw (10) is provided inside the jaw support (19). The tail end of the jaw support (19) is connected to the connecting rod (14).

2. The high-reliability hydraulic gripper according to claim 1, characterized in that: An air inlet nozzle (21) is provided inside the sealing bottom plate (12). A valve core (22) is provided inside the air inlet nozzle (21), and a plug (23) is provided inside the valve core (22). A sealing ring (24), a retaining ring (25), and a lock ring (26) are sequentially provided around the sealing bottom plate (12) from the inside to the outside. The outer side of the sealing bottom plate (12) is attached to the rear installation plate (17). A fixing plate (27) is provided outside the rear installation plate (17). Corresponding threaded holes are provided on the rear installation plate (17), the fixing plate (27), and the sealing bottom plate (12). The rear installation plate (17), the fixing plate (27), and the sealing bottom plate (12) are fixedly connected by threading.

3. The high-reliability hydraulic gripper according to claim 2, wherein: A convex block (31) is provided at the tail of the connecting rod (14). The top of the convex block (31) passes through the piston (13) and a retaining clip (32) is provided around it. A retaining ring I (33) is provided around the upper layer of the top of the convex block (31). A sealing ring I (34) is provided around the upper layer of the convex block (31) on one side of the retaining clip (32).

4. The high-reliability hydraulic gripper according to claim 3, characterized in that: An oil seal ring (41), a guide ring (42), a buffer ring (43), and a sealing ring II (44) are sequentially provided on the outer side of the piston (13) from the head end to the tail end. A sealing ring III (45) and a retaining ring II (46) are sequentially provided around the connecting rod (14) inside the head end of the piston (13). An oil cavity (47) is formed between the outer side wall of the head end of the piston (13) and the barrel wall of the gas spring (1) and the sealing sleeve (11). An oil inlet (48) is provided on the barrel wall of the gas spring (1) at the corresponding position of the oil cavity.

5. The high-reliability hydraulic gripper according to claim 4, wherein: A retaining clip I (51), a lock ring I (52), a retaining ring III (53), and a sealing ring IV (54) are sequentially provided on the outer wall of the sealing sleeve (11) from the head end to the tail end. A dust-proof ring (55) is provided at the head end of the inner wall of the sealing sleeve (11), and a rod seal (56) is provided at the tail end of the inner wall of the sealing sleeve (11). Two guide plates (57) are provided around the connecting rod (14) between the dust-proof ring (55) and the rod seal (56).

6. The highly reliable hydraulic gripper according to claim 5, characterized in that: The positions where the retaining ring (25), retaining ring I (33), retaining ring II (46) and retaining ring III (53) are provided are all provided with grooves that fit their shapes. The outer side of the front mounting plate (18) is also provided with a fixing plate (27). The front mounting plate (18) and the fixing plate (27) are threadedly fixed to the slip holder (19) through the same fixing structure as that of the rear mounting plate.

7. The highly reliable hydraulic gripper according to claim 6, characterized in that: On the upper and lower sides of the inner side of the slip holder (19), there are limit blocks (101). Between the limit blocks (101), there is the slip (10). Inside the slip (10), there are a number of mounting grooves (102). Inside the mounting grooves (102), a number of fixing blocks (103) are sequentially provided. On the surface of the fixing blocks (103), a number of quadrangular pyramid-shaped protrusions are evenly arranged, and the top of the quadrangular pyramid of the protrusions is ground flat.

Images