Clamping mechanism for seamless steel tube

Abstract

The invention provides a clamping mechanism for seamless steel pipes, and belongs to the technical field of steel pipe welding clamping, the clamping mechanism comprises a base and a clamp body, the middle of the base is fixedly connected with a supporting frame, one side wall of the base is rotatably connected with a rotating shaft, and the end, located in the base, of the rotating shaft is fixedly connected with a first bevel gear; the bottom surface of the base is fixedly connected with a supporting seat, the supporting seat is rotationally connected with two symmetrical screw rods between the two side walls of the base, the ends, away from the side walls of the base, of the two screw rods are fixedly connected with second bevel gears, the second bevel gears are meshed with the first bevel gears, the screw rods are in threaded connection with sliding blocks, and the sliding blocks are in threaded connection with the sliding blocks. The upper surface of the sliding block is fixedly connected with a first sliding plate. The seamless steel pipe welding device is suitable for welding seamless steel pipes with different diameters, high in applicability, easy to operate and high in working efficiency, and the welding device is provided with a blowing device and can cool a welding head and a welding seam.

Description

Technical Field

[0001] The invention belongs to the technical field of steel pipe welding clamping, and in particular relates to a clamping mechanism for a seamless steel pipe. Background Art

[0002] Seamless steel pipes are made of a whole piece of metal, and there are no seams on the surface. They are called seamless steel pipes. According to the production method, seamless pipes are divided into hot-rolled pipes, cold-rolled pipes, extruded pipes, jacking pipes, etc. According to different uses, there are thick-walled pipes and thin-walled pipes. Seamless steel pipes are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemicals, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation.

[0003] After searching, Chinese patent publication number CN109108566B proposed that the traditional seamless steel pipe clamping device is unstable and cannot achieve stable butt welding, and proposed a solution to clamp the seamless steel pipe by two arc grooves, and to make the two seamless steel pipes close to each other and weld by rotating the bidirectional screw. This solution has the following problems: 1. Use an arc groove to clamp the seamless steel pipe. If the radius of the arc groove is larger than the radius of the seamless steel pipe, there are only two straight lines in contact between the arc groove and the seamless steel pipe. Positioning and clamping are performed through the two straight lines of contact, and the stability is not high. If the radius of the arc groove is smaller than the radius of the seamless steel pipe, the seamless steel pipe cannot be placed in the arc groove for clamping.

[0004] 2. Since the welding surface is circular, only the upper part can be welded, and the lower part is not easy to weld. Therefore, to complete the complete welding, it is necessary to weld a part first, and then disassemble the seamless steel pipe, rotate it at a certain angle, and clamp it again for welding. To complete the welding, the seamless steel pipe needs to be disassembled once or multiple times, which is troublesome to operate and has low work efficiency.

[0005] 3. During the welding process of seamless steel pipes, the welding area must be kept dry and clean to avoid overheating. The existing equipment does not have the function of ventilation and cooling. The high temperature of the welding head during long-term operation can easily damage the seamless steel pipe and affect the welding quality. Summary of the invention

[0006] The purpose of the present invention is to solve the problems mentioned in the background technology in the prior art and to propose a clamping mechanism for a seamless steel pipe.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A clamping mechanism for a seamless steel pipe comprises a base and a clamping body, wherein a support frame is fixedly connected in the middle of the base, a rotating shaft is rotatably connected to a side wall of the base, one end of the rotating shaft located in the base is fixedly connected to a first bevel gear, a support seat is fixedly connected to the bottom surface of the base, and the support seat is rotatably connected to two symmetrical screws between the two side walls of the base, one end of the two screws away from the side wall of the base is fixedly connected to a second bevel gear, the second bevel gear and the first bevel gear are meshed with each other, a slider is threadedly connected to the screw, the upper surface of the slider is fixedly connected to the first slide plate, and the two ends of the first slide plate are respectively The cam is connected to the upper surface of the second slide plate, and the upper surface of the second slide plate is fixedly connected to the motor, and the output shaft of the motor is fixedly connected to a cam and a first pulley, and the upper surface of the base is fixedly connected to an air cylinder, and a piston is arranged in the air cylinder, and two first telescopic rods are arranged on the upper surface of the side wall of the base away from the rotating shaft, and a connecting rod is fixedly connected to the ends of the two first telescopic rods away from each other, and the end of the connecting rod away from the first telescopic rod is slidably connected to the cam.

[0008] Furthermore, the clamp body includes a main body, a through hole is provided on the main body, an annular groove is provided on the side wall of the main body close to the through hole, an annular plate is slidably connected in the annular groove, a fixed block and a V-shaped block are fixedly connected to the annular plate, the fixed block and the V-shaped block are positioned opposite to each other, a second telescopic rod is fixedly connected to a side of the fixed block away from the annular plate, and an extrusion plate is fixedly connected to an end of the second telescopic rod away from the fixed block.

[0009] Furthermore, a second pulley is fixedly connected to the annular plate, a groove corresponding to the annular plate is provided on a side of the main body away from the second bevel gear, and the second pulley extends through the groove to the outside of the main body.

[0010] Furthermore, the second pulley is connected to the first pulley via a belt, and the transmission ratio between the second pulley and the first pulley is 1:5.

[0011] Furthermore, the side wall of the base away from the rotating shaft and the upper surface of the support frame are both provided with support blocks, the air cylinder is fixedly connected to the support block on the upper surface of the support frame, the end of the piston away from the air cylinder is rotatably connected to the support block on the upper surface of the base, and the piston and the air cylinder are slidably connected.

[0012] Furthermore, the air outlet position of the air cylinder is aligned with the welding seam position.

[0013] Furthermore, the base and the support frame are both provided with a slide groove, the first slide plate and the second slide plate are both slidably connected in the slide groove, and the first slide plate is fixedly connected to the second slide plate.

[0014] Furthermore, one end of the rotating shaft away from the supporting base is fixedly connected to a handle, and an anti-slip pad is provided on the handle.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The present invention provides a V-shaped block, places the seamless steel pipe on the V-shaped block and clamps it through an extrusion plate, which can be applied to the clamping of seamless steel pipes of different thicknesses, has strong applicability, and is more stable after clamping; 2. The present invention sets an annular plate, and the V-shaped block and the extrusion plate are fixedly connected to the annular plate. During welding, the motor drives the second pulley to rotate, thereby rotating the annular plate and the seamless steel pipe. The welding can be completed by clamping once, without multiple clamping, and the operation is simple and the work efficiency is high. 3. The present invention sets an air cylinder. When the motor drives the seamless steel pipe to rotate, the cam drives the connecting rod to move back and forth horizontally, so that the first telescopic rod pushes and pulls the piston, and the generated airflow blows toward the weld to ventilate and cool the welding head and the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a clamping mechanism for a seamless steel pipe proposed by the present invention; Figure 2 A side view of the overall structure of a clamping mechanism for a seamless steel pipe proposed by the present invention; Figure 3 A top view of the overall structure of a clamping mechanism for a seamless steel pipe proposed by the present invention; Figure 4 A schematic diagram of a clamp structure of a clamping mechanism for a seamless steel pipe proposed by the present invention; Figure 5 A front and sectional view of a clamp of a clamping mechanism for a seamless steel pipe proposed by the present invention; Figure 6 The present invention is a side sectional view of a clamp of a clamping mechanism for a seamless steel pipe.

[0017] In the figure: 1 base, 2 clamp body, 11 support frame, 12 rotating shaft, 121 handle, 122 first bevel gear, 13 support seat, 14 screw, 141 second bevel gear, 15 slider, 151 first slide plate, 16 second slide plate, 161 motor, 162 cam, 163 first pulley, 17 air cylinder, 171 piston, 18 first telescopic rod, 181 connecting rod, 21 main body, 22 through hole, 23 annular plate, 24 fixed block, 25 V-shaped block, 26 second telescopic rod, 27 extrusion plate, 28 second pulley. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Reference Figure 1-Figure 6 A clamping mechanism for a seamless steel pipe comprises a base 1 and a clamping body 2, wherein a support frame 11 is fixedly connected in the middle of the base 1, a rotating shaft 12 is rotatably connected to one side wall of the base 1, an end of the rotating shaft 12 away from the support base 1 is fixedly connected to a handle 121, an anti-slip pad is arranged on the handle 121, and the rotating shaft 12 is driven to rotate by rotating the handle 121, an end of the rotating shaft 12 in the base 1 is fixedly connected to a first bevel gear 122, a support seat 13 is fixedly connected to the bottom surface of the base 1, and the support seat 13 is rotatably connected to two symmetrical screws 14 between the two side walls of the base 1, and the two ends of the screws 14 away from the side wall of the base 1 are fixedly connected There is a second bevel gear 141, and the second bevel gear 141 and the first bevel gear 122 are meshed with each other. The screw 14 is threadedly connected with a slider 15, and the threads on the two screws 14 have the same direction. When the first bevel gear 122 rotates, it drives the two second bevel gears 141 to rotate in the opposite direction, so that the sliders 15 move in opposite directions, so that the two sliders 15 are close to or away from each other. A first slide plate 151 is fixedly connected to the upper surface of the slider 15, and the two ends of the first slide plate 151 are respectively slidably connected to the side wall of the base 1 close to the rotating shaft 12 and the support frame 11. The rotation of the rotating shaft 12 drives the screw 14 to rotate, thereby adjusting the distance between the two first slide plates 151.

[0020] The upper surface of the first slide plate 151 is fixedly connected with a clamp body 2, and a second slide plate 16 is slidably connected between the side wall of the base 1 away from the rotating shaft 12 and the support frame 11, and a slide groove is provided on the base 1 and the support frame 11, and the first slide plate 151 and the second slide plate 16 are both slidably connected in the slide groove, and the first slide plate 151 is fixedly connected to the second slide plate 16. The first slide plate 151 and the second slide plate 16 are fixedly connected to ensure that when the handle 121 is rotated, the first slide plate 151 and the second slide plate 16 move synchronously, and the relative positions of the first pulley 163 and the second pulley 28 will not change, so as to prevent the belt from falling off, and the upper surface of the second slide plate 16 is fixedly connected with a motor 161, and a cam 162 and a first pulley 163 are fixedly connected on the output shaft of the motor 161, and an air cylinder 17 is fixedly connected to the upper surface of the base 1, and the air outlet position of the air cylinder 17 is aligned with the weld position, and a piston 171 is provided in the air cylinder 17, and the piston 171 reciprocates in the air cylinder 17 to generate airflow to cool the weld and the welding head.

[0021] Two first telescopic rods 18 are arranged on the upper surface of the side wall of the base 1 away from the rotating shaft 12, and a connecting rod 181 is fixedly connected to one end of the two first telescopic rods 18 away from each other, and one end of the connecting rod 181 away from the first telescopic rod 18 is slidably connected to the cam 162, and support blocks are arranged on the side wall of the base 1 away from the rotating shaft 12 and the upper surface of the support frame 11, and the air cylinder 17 is fixedly connected to the support block on the upper surface of the support frame 11, and the end of the piston 171 away from the air cylinder 17 is rotatably connected to the support block on the upper surface of the base 1, and the piston 171 It is slidably connected to the gas cylinder 17. When the motor 161 rotates, it drives the cam 162 to rotate. Under the action of the cam 162, the connecting rod 181 reciprocates in the horizontal plane. The first telescopic rod 18 moves synchronously with the cam 162, so that the piston 171 fixed on the first telescopic rod 18 reciprocates in the gas cylinder 17. The reciprocating motion of the piston 171 in the gas cylinder 17 generates airflow. The airflow blows from the air outlet of the gas cylinder 17 to the weld and the welding head, cools the weld and the welding head, avoids the damage of the seamless steel pipe due to the excessive temperature of the welding head during long-term operation, and ensures the quality of welding.

[0022] The clamp body 2 includes a main body 21, a through hole 22 is provided on the main body 21, and an annular groove is provided on the side wall of the main body 21 near the through hole 22, an annular plate 23 is slidably connected in the annular groove, and a second pulley 28 is fixedly connected to the annular plate 23. When the second pulley 28 rotates, it will drive the annular plate 23 to rotate synchronously in the annular groove, so that the extrusion plate 27, the V-shaped block 25 and the seamless steel pipe rotate, and a groove corresponding to the annular plate 23 is provided on the side of the main body 21 away from the second bevel gear 141, and the second pulley 28 extends to the outside of the main body 21 through the groove, and the second pulley 28 is connected to the first pulley 163 by a belt. The transmission ratio of the pulley 163 is 1:5, which reduces the rotation speed of the second pulley 28 so that the seamless steel pipe rotates at a suitable speed, which is convenient for welding workers to weld and ensures the welding quality. The annular plate 23 is fixedly connected with a fixed block 24 and a V-shaped block 25. The fixed block 24 and the V-shaped block 25 are positioned relative to each other. The fixed block 24 is fixedly connected with a second telescopic rod 26 on the side away from the annular plate 23, and the second telescopic rod 26 is fixedly connected with an extrusion plate 27 on one end away from the fixed block 24. When clamping, the seamless steel pipe is placed on the V-shaped block. When the length of the second telescopic rod 26 is adjusted, the extrusion plate 27 clamps the seamless steel pipe on the V-shaped block. The seamless steel pipe is clamped by the extrusion plate 27 and the V-shaped block, and the clamping is more stable.

[0023] The functional principle of the present invention can be explained through the following operation mode: when in use, the two seamless steel pipes to be welded are respectively placed on the two V-shaped blocks 25, and the extrusion plate 27 is adjusted to press the seamless steel pipe onto the V-shaped block 25 by adjusting the second telescopic rod 26. The seamless steel pipe is clamped by the V-shaped block 25 and the extrusion plate 27. The contact parts of the V-shaped block 25 and the extrusion plate 27 with the seamless steel pipe when clamped are three straight lines. Compared with the existing clamping through two arc grooves, the clamping stability is higher. Then the handle 121 is rotated to drive the rotating shaft 12 to rotate, and the rotating shaft 12 drives the first bevel gear 122 to rotate. Under the meshing action of the first bevel gear 122 and the second bevel gear 141, the two screws 14 start to rotate, and the slider 15 on the screw 14 drives the first slide plate 151 and the clamp body 2 to approach each other to connect the two seamless steel pipes together. After the clamping is stable, the motor 161 is turned on to prepare for welding.

[0024] Turn on the motor 161, and the output shaft of the motor 161 drives the first pulley 163 to rotate. Under the action of the belt, the second pulley 28 drives the annular plate 23 to rotate, so that the fixed block 24 and the V-shaped block 25 fixed on the annular plate 23 rotate, thereby rotating the seamless steel pipe clamped between the V-shaped block 25 and the extrusion plate 27. Workers can directly weld at the welding point, so that the seamless steel pipe can rotate automatically during the welding process, and there is no need for multiple disassembly and welding. The operation is simple and the work efficiency is high. In addition, only welding once makes the weld more beautiful.

[0025] When the motor 161 drives the first pulley 163 to rotate, the cam 162 rotates together. The rotation of the cam 162 causes the connecting rod 181 to pull the first telescopic rod 18 to reciprocate, thereby causing the piston 171 to reciprocate in the air cylinder 17. The generated airflow blows toward the weld and the welding head to cool them down. While cooling the weld, it can prevent the welding head from overheating and damaging the seamless steel pipe.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A clamping mechanism for a seamless steel pipe, comprising a base (1) and a clamping body (2), characterized in that: A support frame (11) is fixedly connected in the middle of the base (1); a rotating shaft (12) is rotatably connected to a side wall of the base (1); one end of the rotating shaft (12) located inside the base (1) is fixedly connected to a first bevel gear (122); a support seat (13) is fixedly connected to the bottom surface of the base (1); two symmetrical screw rods (14) are rotatably connected to the support seat (13) between two side walls of the base (1); one end of the two screw rods (14) away from the side wall of the base (1) is fixedly connected to a second bevel gear (141); the second bevel gear (141) and the first bevel gear (122) are meshed with each other; a slider (15) is threadedly connected to the screw rod (14); a first slide plate (151) is fixedly connected to the upper surface of the slide plate (15); and two ends of the first slide plate (151) are respectively slidably connected to the base (1) near the rotating shaft (12). The first slide plate (151) is fixedly connected to the side wall and the support frame (11), the upper surface of the first slide plate (151) is fixedly connected to a clamp body (2), the side wall of the base (1) away from the rotating shaft (12) and the support frame (11) are slidably connected to a second slide plate (16), the upper surface of the second slide plate (16) is fixedly connected to a motor (161), the output shaft of the motor (161) is fixedly connected to a cam (162) and a first pulley (163), the upper surface of the base (1) is fixedly connected to an air cylinder (17), a piston (171) is arranged in the air cylinder (17), the upper surface of the side wall of the base (1) away from the rotating shaft (12) is provided with two first telescopic rods (18), the ends of the two first telescopic rods (18) away from each other are fixedly connected to a connecting rod (181), and the end of the connecting rod (181) away from the first telescopic rod (18) is slidably connected to the cam (162).

2. A clamping mechanism for a seamless steel pipe according to claim 1, characterized in that: The clamp body (2) comprises a main body (21), the main body (21) being provided with a through hole (22), a side wall of the main body (21) close to the through hole (22) being provided with an annular groove, an annular plate (23) being slidably connected in the annular groove, a fixed block (24) and a V-shaped block (25) being fixedly connected to the annular plate (23), the fixed block (24) and the V-shaped block (25) being positioned opposite to each other, a side of the fixed block (24) away from the annular plate (23) being fixedly connected to a second telescopic rod (26), and an end of the second telescopic rod (26) away from the fixed block (24) being fixedly connected to an extrusion plate (27).

3. A clamping mechanism for a seamless steel pipe according to claim 2, characterized in that: A second pulley (28) is fixedly connected to the annular plate (23); a groove corresponding to the annular plate (23) is provided on a side of the main body (21) away from the second bevel gear (141); and the second pulley (28) extends through the groove to the outside of the main body (21).

4. A clamping mechanism for a seamless steel pipe according to claim 3, characterized in that: The second pulley (28) is connected to the first pulley (163) via a belt, and the transmission ratio between the second pulley (28) and the first pulley (163) is 1:

5.

5. The clamping mechanism for a seamless steel pipe according to claim 1, characterized in that: A side wall of the base (1) away from the rotating shaft (12) and an upper surface of the support frame (11) are both provided with support blocks, the gas cylinder (17) is fixedly connected to the support block on the upper surface of the support frame (11), one end of the piston (171) away from the gas cylinder (17) is rotatably connected to the support block on the upper surface of the base (1), and the piston (171) and the gas cylinder (17) are slidably connected.

6. A clamping mechanism for a seamless steel pipe according to claim 1, characterized in that: The gas outlet of the gas cylinder (17) is aligned with the welding seam.

7. The clamping mechanism for a seamless steel pipe according to claim 1, characterized in that: The base (1) and the support frame (11) are both provided with a slide groove, the first slide plate (151) and the second slide plate (16) are both slidably connected in the slide groove, and the first slide plate (151) and the second slide plate (16) are fixedly connected.

8. The clamping mechanism for a seamless steel pipe according to claim 1, characterized in that: One end of the rotating shaft (12) away from the supporting base (1) is fixedly connected to a handle (121), and an anti-slip pad is provided on the handle (121).

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