Elastic righting device for hydraulic tongs

Abstract

The utility model relates to the technical field of petroleum drilling, in particular to a hydraulic tong elastic centralizing device which comprises a bottom layer air cylinder, a middle air cylinder arranged in the bottom layer air cylinder, an air cylinder rod arranged in the middle air cylinder, a connecting base fixedly connected to the bottom of the bottom layer air cylinder, a centralizing block arranged in the connecting base, and a positioning hole formed in the centralizing block. A fixing ring is fixedly connected to the upper end of the outer wall of the bottom layer air cylinder, a U-shaped plate is fixedly connected to the outer wall of the fixing ring, connectors are movably connected to the inner wall of the U-shaped plate and the inner walls of the linkage grooves, and connecting rods are fixedly connected to the outer walls of the connectors. The other ends of the connecting rods are fixedly connected with baffles, and a spring is arranged between the two baffles in the same group. According to the utility model, the torsion at the fixed tail pile and the connecting cross pin is reduced, the cylinder rod is prevented from being bent or broken due to overlarge stress, and the safety of equipment and personnel is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of oil drilling, especially relates to a hydraulic tongs elastic centralizing device. BACKGROUND

[0002] In oil drilling, hydraulic tongs is an important tool, which is mainly used for fastening and disassembling the joints on the drill pipe. Hydraulic tongs can provide powerful power through the hydraulic system, and can quickly and accurately fasten and disassemble the joints on the drill pipe, thereby improving the efficiency of drilling operation.

[0003] The transfer cylinder is responsible for executing the forward movement of the hydraulic tongs and recovering the standby work, and at the same time, it transmits part of the torque when the hydraulic tongs is fastened and disassembled. When the hydraulic tongs is moved forward, it will swing left and right and cannot be aligned with the wellhead drilling tool. Two positive and negative hooks are often used to prevent the hydraulic tongs from swinging left and right, but in the process of use, the cylinder rod is often bent and deformed or the connecting head is broken due to too large torque transmission. The equipment maintenance time is long, which also causes safety risk to personnel and cannot improve the efficiency of on-site work. SUMMARY

[0004] The utility model aims at solving the shortcomings in the prior art and provides a hydraulic tongs elastic centralizing device.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a hydraulic tongs elastic centralizing device, comprising a bottom layer cylinder, an intermediate cylinder is arranged in the inside of the bottom layer cylinder, a cylinder rod is arranged in the inside of the intermediate cylinder, a connecting seat is fixedly connected to the bottom of the bottom layer cylinder, a centralizing block is arranged in the inside of the connecting seat, a positioning hole is arranged in the inside of the centralizing block, a positioning cross pin is arranged in the inside of the positioning hole, a hydraulic tongs is fixedly connected to the bottom of the centralizing block, a connecting head is movably connected to the inner wall of the U-shaped plate and the inner wall of the linkage groove, a connecting rod is fixedly connected to the outer wall of the connecting head, a baffle is fixedly connected to the other end of the connecting rod, a limiting strip is fixedly connected to the outer wall of the two connecting rods in the inner layer, a limiting groove is arranged in the inner wall of the two connecting rods in the outer layer, the limiting groove penetrates through the baffle, a spring is arranged in the middle of the two baffles in the same group, and the spring is arranged outside the two connecting rods in the same group.

[0006] Further description of the above technical scheme:

[0007] Positioning thread holes are arranged in the two ends of the positioning cross pin, positioning bosses are threadedly connected to the inner wall of the positioning thread holes, and the two positioning bosses are respectively arranged outside the two sides of the connecting seat.

[0008] As a further description of the above technical solutions:

[0009] The top of the cylinder rod is provided with a fixed tail pile, the bottom of the fixed tail pile is fixedly connected with a connecting plate, and the top of the cylinder rod extends to the inside of the connecting plate.

[0010] As a further description of the above technical solutions:

[0011] The top of the cylinder rod is provided with a connecting hole, and the connecting hole is internally mounted with a connecting cross pin.

[0012] As a further description of the above technical solutions:

[0013] Both ends of the connecting cross pin are provided with connecting threaded holes, the inner walls of the connecting threaded holes are threadedly connected with connecting bosses, and the two connecting bosses are located at the two side outer portions of the connecting plate.

[0014] As a further description of the above technical solutions:

[0015] The righting block is in a V shape, the connecting seat is in an oval shape, and the connecting rods are all in a semicircular shape.

[0016] The utility model has the advantages of the following beneficial effects:

[0017] 1. The bottom cylinder, the middle cylinder and the cylinder rod form a multi-stage lifting cylinder, the connecting seat connected with the bottom cylinder moves downward, and then the righting block and the hydraulic tongs move downward synchronously, when the drilling tool is screwed on, the hydraulic tongs rotates clockwise by a certain angle, since the hydraulic tongs is fixedly connected with the righting block, the righting block rotates clockwise synchronously with the positioning cross pin as the center, the left two connecting rods move relatively, since the left two connecting rods are limited by the springs, the left spring is compressed, and the right spring is in a stretching state according to the same principle, then the left spring rebounds, the right spring rebounds, the righting block drives the hydraulic tongs to return to the original position, the rigid connection of the positive and negative hooks is replaced, the high elasticity of the spring is utilized to offset the counter torque, the torsion at the fixed tail pile and the connecting cross pin is reduced, the cylinder rod is prevented from being bent or broken due to excessive force, the safety of the equipment and personnel is ensured, in the prior art, the hydraulic tongs swings left and right and cannot be aligned with the well mouth drilling tool when the hydraulic tongs is moved forward, two positive and negative hooks are often used to pull tightly on the spot to prevent the hydraulic tongs from swinging left and right, but in the process of use, the cylinder rod is often bent and deformed or the connecting head is broken due to excessive torque transmission, the equipment needs to be maintained for a long time, personnel safety risks are caused, and the on-site work efficiency cannot be improved, the device replaces the rigid connection of the positive and negative hooks, utilizes the high elasticity of the spring to offset the counter torque, reduces the torsion at the fixed tail pile and the connecting cross pin, prevents the cylinder rod from being bent or broken due to excessive force, and ensures the safety of the equipment and personnel. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A first perspective view of the overall structure of the elastic righting device of the hydraulic tongs is shown in the utility model;

[0019] Figure 2 The connecting cross pin structure of the elastic righting device of the hydraulic tongs is shown in the utility model;

[0020] Figure 3 The righting block structure of the elastic righting device of the hydraulic tongs is shown in the utility model;

[0021] Figure 4 The connecting rod structure of the elastic righting device of the hydraulic tongs is shown in the utility model.

[0022] Legend:

[0023] 1, bottom cylinder; 2, intermediate cylinder; 3, cylinder rod; 4, connecting seat; 5, righting block; 6, positioning hole; 7, hydraulic tongs; 8, positioning cross pin; 801, positioning threaded hole; 802, positioning boss; 9, linkage groove; 10, fixed ring; 11, U-shaped plate; 12, connecting head; 13, connecting rod; 14, baffle; 15, limiting strip; 16, limiting groove; 17, spring; 18, fixed tail stake; 19, connecting plate; 20, connecting hole; 21, connecting cross pin; 2101, connecting threaded hole; 2102, connecting boss. DETAILED DESCRIPTION

[0024] Reference Figures 1-4 The utility model provides a kind of elastic righting device of hydraulic tongs: including bottom cylinder 1, the inside of bottom cylinder 1 is provided with intermediate cylinder 2, the inside of intermediate cylinder 2 is provided with cylinder rod 3, the bottom of bottom cylinder 1 is fixedly connected with connecting seat 4, connecting seat 4 is oval, the inside of connecting seat 4 is provided with righting block 5, righting block 5 is V-shaped, positioning hole 6 is set in the inside of righting block 5, the bottom of righting block 5 is fixedly connected with hydraulic tongs 7, positioning hole 6 is installed with positioning cross pin 8, the both ends of righting block 5 are all set with linkage groove 9, the outer wall upper end of bottom cylinder 1 is fixedly connected with fixed ring 10, the outer wall of fixed ring 10 is fixedly connected with U-shaped plate 11, and the quantity of U-shaped plate 11 is two, the inner wall of U-shaped plate 11 and the inner wall of linkage groove 9 are all movably connected with connecting head 12, the outer wall of connecting head 12 is fixedly connected with connecting rod 13, multiple connecting rods 13 are all semicircular, the other end of connecting rod 13 is fixedly connected with baffle 14, the outer wall of inner layer two connecting rods 13 is all fixedly connected with limiting strip 15, the inner wall of outer layer two connecting rods 13 is all set with limiting groove 16, limiting groove 16 penetrates baffle 14, so that adjacent two connecting rods 13 are relatively more stable and cannot be separated, and spring 17 is arranged in the middle of same group two baffles 14, and spring 17 is located at the outside of same group two connecting rods 13.

[0025] The bottom layer cylinder 1, the middle cylinder 2 and the cylinder rod 3 constitute a multi-stage lifting cylinder, the connecting seat 4 connected with the bottom layer cylinder 1 moves downward, and then the centralizing block 5 and the hydraulic tongs 7 move downward synchronously, when the drilling tool is made up, the hydraulic tongs 7 rotates clockwise by a certain angle, since the hydraulic tongs 7 is fixedly connected with the centralizing block 5, the centralizing block 5 rotates clockwise synchronously with the positioning cross pin 8 as the center, so that the two connecting rods 13 on the left side move relatively, and since the two connecting rods 13 on the left side are limited by the springs 17, the left side springs 17 are compressed, and the right side springs 17 are in the same principle in the stretched state, then the left side springs 17 rebound, the right side springs 17 rebound, the centralizing block 5 drives the hydraulic tongs 7 to return to the original position, instead of the rigid connection of the positive and negative hooks, the high elasticity of the springs 17 is used to offset the counter torque, reduce the torsion at the fixed tail pile 18 and the connecting cross pin 21, prevent the cylinder rod 3 from being bent or broken due to excessive force, and ensure the safety of the equipment and personnel.

[0026] The two ends of the positioning cross pin 8 are provided with positioning threaded holes 801, the inner walls of the positioning threaded holes 801 are threadedly connected with positioning bosses 802, and the two positioning bosses 802 are located at the outer sides of the connecting seat 4 respectively. The positioning cross pin 8 is convenient to disassemble and assemble, so that the centralizing block 5 and the connecting seat 4 are convenient to disassemble and assemble.

[0027] The top of the cylinder rod 3 is provided with the fixed tail pile 18, the bottom of the fixed tail pile 18 is fixedly connected with the connecting plate 19, the top of the cylinder rod 3 extends into the inside of the connecting plate 19, the top of the cylinder rod 3 is provided with the connecting hole 20, and the connecting hole 20 is installed with the connecting cross pin 21, so that the cylinder rod 3 and the connecting plate 19 are connected firmly.

[0028] The two ends of the connecting cross pin 21 are provided with connecting threaded holes 2101, the inner walls of the connecting threaded holes 2101 are threadedly connected with connecting bosses 2102, and the two connecting bosses 2102 are located at the outer sides of the connecting plate 19 respectively. The connecting cross pin 21 is convenient to disassemble and assemble, so that the cylinder rod 3 and the connecting plate 19 are convenient to disassemble and assemble.

[0029] Working principle: the bottom cylinder 1, the middle cylinder 2 and the cylinder rod 3 constitute a multi-stage lifting cylinder, the connecting seat 4 connected with the bottom cylinder 1 moves downward, and then the righting block 5 and the hydraulic tongs 7 move downward synchronously, when the drilling tool is made up, the hydraulic tongs 7 rotates clockwise by a certain angle, since the hydraulic tongs 7 is fixedly connected with the righting block 5, the righting block 5 rotates clockwise synchronously with the positioning cross pin 8 as the center, so that the two left connecting rods 13 move relatively, since the two left connecting rods 13 are limited by the springs 17, the left springs 17 are compressed, the right springs 17 are in the same principle in the tensile state, then the left springs 17 rebound, the right springs 17 rebound, so that the righting block 5 drives the hydraulic tongs 7 to return to the original position, the rigid connection of the righting block 5 and the hydraulic tongs 7 is replaced, the high elasticity of the spring 17 is used to offset the counter torque, the torsion at the fixed tail pile 18 and the connecting cross pin 21 is reduced, the bending or fracture of the cylinder rod 3 caused by excessive force is prevented, and the safety of the equipment and personnel is ensured.

[0030] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. within the spirit and principles of the utility model, should be contained in the protection scope of the utility model.

Claims

1. A hydraulic tongs elastic righting device, comprising a bottom layer cylinder (1), characterized in that: The bottom layer cylinder (1) is internally provided with an intermediate cylinder (2), the intermediate cylinder (2) is internally provided with a cylinder rod (3), the bottom of the bottom layer cylinder (1) is fixedly connected with a connecting seat (4), the connecting seat (4) is internally provided with a centralizing block (5), the centralizing block (5) is internally provided with a positioning hole (6), the bottom of the centralizing block (5) is fixedly connected with a hydraulic clamp (7), the positioning hole (6) is internally provided with a positioning cross pin (8), both ends of the centralizing block (5) are provided with a linkage groove (9), the outer wall of the upper end of the bottom layer cylinder (1) is fixedly connected with a fixed ring (10), the outer wall of the fixed ring (10) is fixedly connected with a U-shaped plate (11), and the number of U-shaped plates (11) is two, the inner wall of the U-shaped plate (11) and the inner wall of the linkage groove (9) are movably connected with a connecting head (12), the outer wall of the connecting head (12) is fixedly connected with a connecting rod (13), the other end of the connecting rod (13) is fixedly connected with a baffle (14), the outer wall of the two connecting rods (13) is fixedly connected with a limiting strip (15), the inner wall of the two connecting rods (13) is provided with a limiting groove (16), the limiting groove (16) penetrates the baffle (14), the middle of the two baffles (14) is provided with a spring (17), and the spring (17) is located outside the two connecting rods (13).

2. The hydraulic tongs elastic righting device according to claim 1, characterized in that: Both ends of the positioning cross pin (8) are provided with a positioning threaded hole (801), and the inner wall of the positioning threaded hole (801) is threadedly connected with a positioning boss (802), and the two positioning bosses (802) are respectively located on the outer sides of the connecting seat (4).

3. The hydraulic tongs elastic righting device according to claim 1, characterized in that: The top of the cylinder rod (3) is provided with a fixed tail pile (18), the bottom of the fixed tail pile (18) is fixedly connected with a connecting plate (19), and the top of the cylinder rod (3) extends into the inside of the connecting plate (19).

4. The hydraulic tongs elastic righting device according to claim 1, characterized in that: The top of the cylinder rod (3) is provided with a connecting hole (20), and the connecting hole (20) is internally provided with a connecting cross pin (21).

5. A hydraulic tongs elastic righting device according to claim 4, characterized in that: Both ends of the connecting cross pin (21) are provided with a connecting threaded hole (2101), and the inner wall of the connecting threaded hole (2101) is threadedly connected with a connecting boss (2102), and the two connecting bosses (2102) are respectively located on the outer sides of the connecting plate (19).

6. The hydraulic tongs elastic righting device according to claim 1, characterized in that: The centralizing block (5) is V-shaped, the connecting seat (4) is oval, and the plurality of connecting rods (13) are semicircular.

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