CN115179020A - Traceless clamping device - Google Patents
Traceless clamping device Download PDFInfo
- Publication number
- CN115179020A CN115179020A CN202211095436.4A CN202211095436A CN115179020A CN 115179020 A CN115179020 A CN 115179020A CN 202211095436 A CN202211095436 A CN 202211095436A CN 115179020 A CN115179020 A CN 115179020A
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- Prior art keywords
- traceless
- elliptic
- frame
- ball
- bearing frame
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- 239000000463 material Substances 0.000 claims description 21
- 238000007373 indentation Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 210000000080 chela (arthropods) Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Clamps And Clips (AREA)
Abstract
A traceless clamping device mainly comprises a pressure bearing frame, a plurality of balls and a supporting frame, wherein the balls are arranged in a space formed by a spherical groove on the pressure bearing frame and an elliptic conical hole on the supporting frame in a clearance mode to form a detachable clamping head, and the part of each ball extending out of the elliptic conical hole is in motion contact with an oil casing; the clamping head is arranged on the jaw plate frame; the centers of the spherical groove and the elliptic conical hole are consistent with the center of the oil casing; the elliptic conical hole is formed by smoothly expanding an inner elliptic hole to an outer elliptic hole. The invention can obviously reduce the scratches of the tangential force of the contact surface on the oil casing and the indentations of the radial force of the contact surface on the oil casing during screwing, and can obviously reduce the tooth marks until no mark exists during screwing.
Description
Technical Field
The invention relates to a clamping device for screwing an oil casing, in particular to a traceless clamping device.
Background
At present, the oil casing coupling is basically screwed by a screwing machine, and in order to meet the sealing performance of the oil casing, a clamp tooth is required to be in contact with the surface of a pipe column to generate torque to complete the pre-tightening force of threads, namely the screwing torque value. In the process, the clamp teeth can leave tooth marks on the surface of the oil casing pipe, the service life of the oil casing pipe is seriously influenced, and the oil casing pipe used in a special threaded fastener and an oil gas field containing hydrogen sulfide gas can be seriously corroded and even broken. Therefore, the damage of pipe tongs tooth marks of the oil casing pipe cannot be ignored, the detailed requirements on the oil casing pipe tooth marks in API 5CT are made, and the depth of the oil casing pipe tooth marks is regulated to be not more than 5% of the wall thickness.
Disclosure of Invention
The invention provides a traceless clamping device, which solves the problem of tooth marks in the screwing process of an oil casing and realizes traceless screwing.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a traceless clamping device mainly comprises a pressure bearing frame, a plurality of balls and a supporting frame, wherein the balls are arranged in a space formed by a spherical groove on the pressure bearing frame and an elliptic conical hole on the supporting frame in a clearance mode to form a detachable clamping head, and the part of each ball extending out of the elliptic conical hole is in motion contact with an oil casing; the clamping head is arranged on the jaw plate frame; the centers of the spherical groove and the elliptic conical hole are consistent with the center of the oil casing; the elliptic conical hole is formed by smoothly expanding an inner elliptic hole to an outer elliptic hole.
The taper of the elliptic conical hole is 65 degrees, and the ball extends out of the inner elliptic hole surface by 1.6-2 mm.
The outer side surface of the support frame is provided with a plurality of bosses which are detachably connected into a whole after being sleeved in through holes in the pressure bearing frame in a matching way.
The surface of the ball bearing is provided with patterns.
The supporting head is connected with dovetail-shaped grooves in the jaw frame in an adaptive mode through dovetail-shaped bosses outside the pressure bearing frame, and the two sides of the supporting head are located by bolts installed in the dovetail-shaped grooves of the jaw frame.
The three groups of clamping heads clamp the oil casing pipe column to form a wrap angle of 300 degrees.
The yield strength of the ball material is greater than that of the oil sleeve material and that of the pressure-bearing frame material.
The ball bearing is arranged on the pressure bearing frame to replace the function of original clamp teeth, and the ball bearing moves in a space formed by the support frame and the pressure bearing frame under the driving of the rotation inertia of the jaw plate frame in the screwing process to complete the contact with an oil sleeve and achieve the purpose of traceless clamping; along with the increase of the torque of the turnbuckle in the clamping and screwing process, the deformation of the oil sleeve is compensated by the elastic-plastic deformation of the bearing frame through the ball, and the friction force between the ball and the oil sleeve is increased through patterns on the ball so as to achieve traceless clamping.
Drawings
FIG. 1 is an exploded view of a gripping head according to the present invention;
FIG. 2 is a general schematic view of a gripping head according to the present invention;
FIG. 3 is a schematic view of a pressure rack of the present invention;
FIG. 4 is a schematic view of the stand of the present invention;
FIG. 5 is a bottom view of the elliptical holes and balls of the support bracket of the present invention;
FIG. 6 is a top view of the elliptical holes and balls of the cage of the present invention;
FIG. 7 is a schematic diagram of the change in position of the balls during operation of the present invention;
FIG. 8 is a schematic view of the ball of the present invention;
FIG. 9 is a schematic view of the jaw plate frame assembly of the present invention;
FIG. 10 is a schematic drawing of the seamless clamping of the oil casing of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1,2,3,4 and 9, a traceless clamping device mainly comprises a pressure bearing frame 2, a plurality of balls 3 and a support frame 4, wherein the balls 3 are arranged in a space formed by a spherical groove 6 on the pressure bearing frame 2 and an elliptic conical hole 8 on the support frame 4 in a clearance mode to form a detachable clamping head 14, and the part, extending out of the elliptic hole 8, of each ball 3 is in moving contact with an oil casing 15; the clamping head 14 is arranged on the jaw frame 12; the centers of the spherical groove 6 and the elliptical conical hole 8 are consistent with the center of the oil casing 15; the elliptical conical hole 8 is formed by smoothly expanding an inner elliptical hole 81 to an outer elliptical hole 82.
As shown in fig. 5, 6 and 7, the taper of the elliptic conical hole 8 is 65 degrees, and the ball 3 extends out of the surface of the inner elliptic hole 81 by 1.6-2 mm.
Wherein, the 65 degree taper angle between the inner elliptical hole 81 and the outer elliptical hole 82 can ensure that the stress surface is always ensured in the spherical groove 6 in the process of the shackle on the contact of the ball 3 and the oil sleeve 15, thereby avoiding the stress of the support frame 4 from influencing the service life of the whole clamping device.
The diameter of a plurality of spherical grooves 6 on the pressure bearing frame 2 is 12.6mm, the diameter of the ball 3 is 10mm, the diameter of the spherical grooves 6 is larger than the diameter of the ball 3, and the ball 3 can move in the spherical grooves 6.
In a non-working state, the surface of the ball 3 exposed out of the inner elliptical hole 81 is at most 2mm, and in a working state, the surface of the ball 3 exposed out of the inner elliptical hole 81 is at least 1.6mm, so that the ball 3 is ensured to be in contact with the oil sleeve 15 and not to fall off from the spherical groove 6, and the ball 3 can also be ensured to roll in the elliptical conical hole 8 to a screwing required position, as shown in fig. 7.
The center of the spherical groove 6, the center of the elliptical conical hole 8 and the center of the clamped oil casing 15 are on the same central line, so that the ball 3 can move downwards in different directions of the upper shackle in a space formed by the bearing frame 2 and the support frame 4 under the action of the screwing-on and unscrewing inertia force, namely, move in an S three-dimensional coordinate system formed by XYZ, and as shown in figure 8, the elliptical conical hole 8 limits the movement in the Z-axis direction, namely, the direction parallel to the oil casing 15.
The outer side surface of the support frame 4 is provided with a plurality of bosses 9, the bosses 9 are sleeved in through holes 7 on the pressure bearing frame 2 in a matching mode, threaded holes 10 are machined in the bosses 9, and the bosses and the threaded holes are connected through bolts to form a detachable clamping head. The ball 3 is used as an intermediate body for clamping the clamping head 14 and the oil sleeve 15, is damaged or clamped to slip in the using process, can be directly replaced, avoids the loss caused by the integral slipping of the clamping head 14, and saves the cost. The boss 9 is used for positioning to ensure that the elliptic conical hole 8 is consistent with the center of the spherical groove 6.
The surface of the ball 3 is provided with irregular patterns 11 which are processed by laser, the Rockwell hardness of the irregular patterns is about 65HRC, and the irregular patterns are used for increasing the friction force between the oil sleeve and the ball 3.
As shown in fig. 9, the clamping head 14 is connected with the dovetail groove of the jaw frame 12 by the dovetail boss 5 outside the pressure bearing frame 2, and both sides of the clamping head 14 are positioned by the bolts 13 installed in the dovetail groove of the jaw frame 12 to prevent the whole clamp from sliding.
The yield strength of the material of the ball 3 > the yield strength of the material of the oil sleeve 15 > the yield strength of the material of the pressure bearing frame 2. When guaranteeing ball 3 simultaneously and oil sleeve 15 and pressure-bearing frame 2 contact, the deflection of pressure-bearing frame 2 is greater than the deflection of oil sleeve to this reduces oil sleeve's deformation, reduces the ball and impresses oil sleeve depth. And the ball 3 is ensured to move in the spherical groove 6 under the condition of increasing the clamping force, and the clamping action of the ball 3 and the oil sleeve 15 is completed.
The gripping head 14 has three sets, which grip the tubing string at a wrap angle of up to 300 °. The clamping head 14 is arranged on the jaw plate frame 12, the jaw plate frame assembly is arranged on the screwing machine, the three groups of the clamping devices can clamp the oil casing pipe column to form wrap angles of 300 degrees and are uniformly distributed, the contact area is increased, and the damage to the pipe column caused by overlarge local clamping force due to clamping in the oil casing pipe screwing process can be reduced.
The working principle of the invention is as follows:
the jaw plate frame 12 rolls for a certain angle under the action of the slope plate to clamp the oil casing 15. As the coupling is screwed in, the balls 3 roll in the spherical grooves 6 of the pressure bearing cage 2 until the position shown in fig. 7 is clamped. The tooth marks generated in the screwing process of the oil casing 15 can be decomposed into two parts, wherein one part is the sliding mark on the oil casing 15 under the action of the tangential force of the contact surface; the other part is the indentation of the oil casing 15 under the action of the radial force of the contact surface. Firstly, in order to ensure that the ball 3 does not slip in the process of contacting and screwing the oil sleeve 15, the friction coefficient between the contact surfaces of the ball and the oil sleeve needs to be increased. According to the classical friction theory, the yield strength of the material of the ball 3 is greater than that of the material of the oil casing 15, the material of the pressure bearing frame 2 is lower than that of the oil casing 15, the surface of the ball 3 is subjected to pattern treatment, and the friction coefficient of the contact surface of the ball 3 and the oil casing 15 is increased, so that the friction coefficient of the contact surface of the ball 3 and the oil casing 15 is ensured to be large enough in the contact process, the ball 3 and the oil casing 15 are ensured not to slide relatively, and the generation of scratches of the contact surface is avoided. Secondly, the contact surface of the ball 3 and the oil sleeve 15 is round in the contact process, the contact surface is enlarged under the same torque action compared with the contact surface of the existing conical tooth mark, the contact area of the ball 3 and the oil sleeve 15 is increased through a 300-degree clamping wrap angle formed by three groups of jaw plate frames 12, the unit stress area of the bearing frame 2 is reduced, the indentation of the oil sleeve 15 is reduced under the action of the ball 3, and meanwhile, due to the fact that the materials of the bearing frame 2, the ball 3 and the oil sleeve 15 are different, the contact stress generated by radial force is converted to the bearing frame 2 in the screwing process, namely the ball 3 compensates the deformation of the oil sleeve 15 through the elastic-plastic deformation of the bearing frame 2. The ball material is GCr15, and the yield strength of the ball material is not less than 1700MPa; the pressure-bearing frame is made of 20CrMo, and the yield strength of the pressure-bearing frame is not less than 685MPa; the oil casing steel grade is P110, and the yield strength of the oil casing steel grade is not less than 758MPa. The friction force between the ball and the oil sleeve is increased through the patterns 11 on the ball 3, and tests prove that the damage to the steel pipe by the common pincer teeth made of the same material is 6.3 times of that of the ball teeth, namely the depth of tooth marks is reduced by 6.3 times, so that the traceless effect is achieved.
The above embodiment is a general method, and the clamping wrap angle can also be continuously increased, but is not more than 360 degrees, and the larger the clamping wrap angle is, the lower the tooth mark is; the materials of the ball and the bearing frame can be not limited to the above materials, but the yield strength of the ball is not less than that of the oil sleeve material, and the yield strength of the oil sleeve is not less than that of the bearing frame material. The ball can be replaced by other shapes, the yield strength of the ball is ensured to be larger than the strength of the materials of the two contact surfaces, and patterns are processed on the surface of the ball to increase the friction force so as to achieve the effect of no mark in screwing.
Claims (7)
1. A traceless clamping device is characterized by mainly comprising a pressure bearing frame (2), a plurality of balls (3) and a support frame (4), wherein the balls (3) are arranged in a space formed by a spherical groove (6) on the pressure bearing frame (2) and an elliptic conical hole (8) on the support frame (4) in a clearance mode to form a detachable clamping head (14), and the part, extending out of the elliptic conical hole (8), of each ball (3) is in motion contact with an oil sleeve (15); the clamping head (14) is arranged on the jaw frame (12); the centers of the spherical groove (6) and the elliptical conical hole (8) are consistent with the center of the oil casing (15); the elliptic conical hole (8) is formed by smoothly expanding an inner elliptic hole (81) to an outer elliptic hole (82).
2. A traceless clamping device according to claim 1, wherein the taper of the elliptical conical bore (8) is 65 ° and the balls (3) protrude 1.6-2 mm beyond the inner elliptical bore (81).
3. The traceless clamping device as claimed in claim 1, wherein a plurality of bosses (9) are arranged on the outer side surface of the supporting frame (4), and the bosses (9) are detachably connected into a whole after being fittingly sleeved in the through holes (7) on the pressure bearing frame (2).
4. A traceless clamping device according to claim 1, wherein said balls (3) have a surface pattern (11).
5. A traceless clamping device according to claim 1, wherein the clamping head (14) is adapted to fit into a dovetail groove on the jaw frame (12) by means of a dovetail boss (5) on the outside of the pressure bearing frame (2), and the clamping head (14) is positioned on both sides by bolts (13) mounted in the dovetail groove of the jaw frame (12).
6. A traceless gripping device according to claim 1, wherein said gripping heads (14) have three sets, gripping the tubing string of the oil casing (15) at a wrap angle of up to 300 °.
7. Traceless clamping device according to any of claims 1-6, characterized in that the yield strength of the ball (3) material > the yield strength of the oil jacket (15) material > the yield strength of the bearing frame (2) material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211095436.4A CN115179020A (en) | 2022-09-08 | 2022-09-08 | Traceless clamping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211095436.4A CN115179020A (en) | 2022-09-08 | 2022-09-08 | Traceless clamping device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115179020A true CN115179020A (en) | 2022-10-14 |
Family
ID=83522538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211095436.4A Pending CN115179020A (en) | 2022-09-08 | 2022-09-08 | Traceless clamping device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115179020A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4395051A (en) * | 1980-02-20 | 1983-07-26 | Kabushiki Kaisha Fujikoshi | Quick-change holder |
| US20020121160A1 (en) * | 1997-09-15 | 2002-09-05 | Bangert Daniel S. | Granular particle gripping surface |
| CN102182408A (en) * | 2011-05-11 | 2011-09-14 | 抚州市临川白勇海洋工程有限公司 | Power slip capable of realizing on-line quick change of clamp tooth boxes and automatic lubrication |
| CN103225483A (en) * | 2013-04-16 | 2013-07-31 | 西安石油大学 | On/off unidirectional self-locking rolling body pincer teeth of oil pipe column |
| CN103266861A (en) * | 2013-06-03 | 2013-08-28 | 西安石油大学 | Roller type non-creasing clamp holder for punching piers of iron roughneck |
| JP2016007691A (en) * | 2014-06-26 | 2016-01-18 | 株式会社ファインテクノ | Working tool |
| CN107191144A (en) * | 2017-07-26 | 2017-09-22 | 西南石油大学 | A kind of seabed drill-bit changing device |
| US20170370166A1 (en) * | 2016-06-28 | 2017-12-28 | Frank's International, Llc | Pipe Wrench |
| CN114961566A (en) * | 2022-06-13 | 2022-08-30 | 程友 | Top drive casing pipe lowering device for small-specification casing pipe |
-
2022
- 2022-09-08 CN CN202211095436.4A patent/CN115179020A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4395051A (en) * | 1980-02-20 | 1983-07-26 | Kabushiki Kaisha Fujikoshi | Quick-change holder |
| US20020121160A1 (en) * | 1997-09-15 | 2002-09-05 | Bangert Daniel S. | Granular particle gripping surface |
| CN102182408A (en) * | 2011-05-11 | 2011-09-14 | 抚州市临川白勇海洋工程有限公司 | Power slip capable of realizing on-line quick change of clamp tooth boxes and automatic lubrication |
| CN103225483A (en) * | 2013-04-16 | 2013-07-31 | 西安石油大学 | On/off unidirectional self-locking rolling body pincer teeth of oil pipe column |
| CN103266861A (en) * | 2013-06-03 | 2013-08-28 | 西安石油大学 | Roller type non-creasing clamp holder for punching piers of iron roughneck |
| JP2016007691A (en) * | 2014-06-26 | 2016-01-18 | 株式会社ファインテクノ | Working tool |
| US20170370166A1 (en) * | 2016-06-28 | 2017-12-28 | Frank's International, Llc | Pipe Wrench |
| CN107191144A (en) * | 2017-07-26 | 2017-09-22 | 西南石油大学 | A kind of seabed drill-bit changing device |
| CN114961566A (en) * | 2022-06-13 | 2022-08-30 | 程友 | Top drive casing pipe lowering device for small-specification casing pipe |
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