CN101818626A - Back-up tong driving structure for power tongs - Google Patents
Back-up tong driving structure for power tongs Download PDFInfo
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- CN101818626A CN101818626A CN200910126131A CN200910126131A CN101818626A CN 101818626 A CN101818626 A CN 101818626A CN 200910126131 A CN200910126131 A CN 200910126131A CN 200910126131 A CN200910126131 A CN 200910126131A CN 101818626 A CN101818626 A CN 101818626A
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- cylinder sleeve
- tong
- rack
- tooth bar
- driving structure
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Abstract
The invention discloses a back-up tong driving structure for power tongs, which comprises a tail handle, a back-up tong head cover plate, a mandrel, a duplicate gear, an oil cylinder cover, a cylinder sleeve, a piston, support rings, a rack and the like. Due to design, the conventional structure has the following defects that: 1, the integral cylinder sleeve is relatively longer and the middle part of the cylinder sleeve is provided with an arched nick, so the cylinder sleeve is difficult to machine; 2, the integral cylinder sleeve is not fixed in the tail handle and can rotate; and 3, the meshing thrust of the duplicate gear makes serious the eccentric wear of the back of a plunger piston of the rack and the integral cylinder sleeve. In the design of the invention, the support rings are arranged at the two ends of the rack and are supported in the cylinder sleeve; the rack is not in contact with the cylinder sleeve; the supporting rings drive the rack to move in the cylinder sleeve and are made from a wear resistant material; and the inner surface of the cylinder sleeve is smooth, hard and wear-resistant. In the back-up tong driving structure, the cylinder sleeve, the piston, the support rings and the rack are all taken out only by disassembling the oil cylinder cover, so the back-up tong driving structure has a simple structure, solves the problems of the eccentric wear and scuffing of the cylinder sleeve, improves sealing reliability, has prolonged service life and is convenient to maintain.
Description
Technical field
The present invention relates to oil drilling and well workover Power Tong, particularly back-up tong driving structure for power tongs.It belongs to the oilfield machinery field.
Background technology
At present, oil drilling and well workover Power Tong are the common equipments that unloads drilling rod, sleeve pipe and oil pipe operation on the oil field, general Power Tong is divided into main pincers and back-up tong according to need of work, when work, back-up tong clamps box cupling or joint is motionless, main clamp is lived body or joint rotation, button or shackle operation in the realization.When operation, back-up tong clamps synchronously along with main pincers or unclamps, and this part action is carried out by the back-up tong driving mechanism.Existing back-up tong driving mechanism is made up of parts such as tail handle, cover plate, oil cylinder cover, tooth bar plunger, duplicate gear, mandrels.Tooth bar plunger two ends band sealing ring, and form cylinder structure between the cylinder sleeve, the tooth bar at tooth bar plunger middle part and the pinion of duplicate gear, duplicate gear is contained on the mandrel, mandrel is fixed on tail handle and the cover plate, and the translation of oil pressure actuated tooth bar plunger is rotated thereby drive duplicate gear, gear wheel by duplicate gear drives the rotation of back-up tong binding clip, realizes clamping or unclamping tubing string.As the patent No. is exactly this back-up tong drives structure that adopts for a kind of novel hydraulic back pincers of " ZL9421328.2 ".This structure has the following disadvantages: the one, and whole cylinder sleeve is longer, the centre has circular arc cutaway again, difficult processing, can only adopt accurate seamless steel pipe, be difficult to improve case hardness, the engagement thrust of tooth bar plunger and duplicate gear makes the back of tooth bar plunger and whole cylinder sleeve eccentric wear serious, causes seal failure; The 2nd, whole cylinder sleeve tail in unfixing, whole cylinder sleeve can rotate, the medial arc indentation, there can be chewed by the duplex pinion, gnaws the iron filings that come and is clipped in and can makes cylinder sleeve occur pulling in the cylinder sleeve, makes sealing of serious failure; The 3rd, if seal failure need be changed whole cylinder sleeve and sealing ring simultaneously, need could change tail to completely knocked down.Afterwards through improving, as the patent No. is a kind of back-up tong driving structure for power tongs of " 200620129967.0 ", it is that tooth bar is separated with piston, middle is that rack tube, both sides are that the three stage structure that oil cylinder overlaps replaces whole cylinder sleeve, form hard smooth rubbing surface between piston and oil cylinder inner room, tooth bar and rack tube, avoid the oil cylinder eccentric wear, improve the cylinder seal performance, increase the service life convenient for maintaining.This structure also has the following disadvantages: the one, and fixing cylinder sleeve not, cylinder sleeve can also rotate; The 2nd, rack tube rotates with two bearing restrictions, increases a plurality of parts, has increased cost and difficulty of processing; The 3rd, also need to take apart whole tail oil cylinder when needing to change tooth bar and rack tube, the maintenance trouble.
Summary of the invention
In order to overcome existing back-up tong driving mechanism structure complexity, the manufacturing cost height keeps in repair trouble, and the deficiency of poor reliability the invention provides a kind of improved back-up tong driving structure for power tongs.
Technical solution of the present invention is made up of tail handle, back-up tong epicranial plate, mandrel, duplicate gear, oil cylinder cover, cylinder sleeve, piston, support ring, tooth bar etc.Pinion on the duplicate gear and tooth bar engagement, duplicate gear is contained on the mandrel, mandrel is installed in the axis hole of back-up tong epicranial plate and tail handle, support ring is equipped with at the tooth bar two ends, support ring is supported in the cylinder sleeve at two ends, piston drives support ring, tooth bar moves with the variation of the pressure in the fluid cylinder, thereby rotates by the rack drives duplicate gear.Two pistons are contained in the cylinder sleeve at two ends and constitute conventional fluid cylinder with oil cylinder cover.Tooth bar does not contact with cylinder sleeve, and support ring is by the high-abrasive material manufacturing, the smooth hard wear resistant of inner surface of cylinder liner.Laying down oil cylinder cover promptly all takes out cylinder sleeve, piston, support ring and tooth bar.It is characterized in that: two external diameters greater than the support ring of tooth bar external diameter from two ends with rack support in cylinder sleeve, and the support ring at tooth bar two ends moves in cylinder sleeve with the piston of two support ring outer ends.Cylinder sleeve stretches out tail being fixed by oil cylinder cover.Support ring is a high-abrasive material, and cylinder sleeve bore is through cure process.Described tooth bar does not contact with cylinder sleeve in the moving process in cylinder sleeve all the time.
The invention has the beneficial effects as follows, improve the back-up tong tail the sealing reliability of driving mechanism, simultaneously for convenience detach, simple in structure, reduced cost, economy and obvious social benefit.
Description of drawings
Fig. 1 is a main sectional view of the present invention.
Fig. 2 is the I--I sectional view of Fig. 1.
1. back-up tong epicranial plates among the figure, 2. mandrel, 3. duplicate gear, 4. screw, 5. tail handle, 6. oil cylinder cover, 7. cylinder sleeve, 8. piston, 9. support ring, 10. tooth bar.
The specific embodiment
As shown in Figure 1, 2, duplicate gear 3 is contained on the mandrel 2, mandrel 2 is contained in back-up tong epicranial plate 1 and tail in 5 the axis hole, back-up tong epicranial plate 1 and tail are fastening 5 usefulness screws 4, pinion on the duplicate gear 3 and tooth bar 10 engagements, support ring 9 is equipped with at tooth bar 10 two ends, support ring 9 and cylinder sleeve 7 inwall matched in clearance, and can in cylinder sleeve 7, move.Piston 8 forms fluid cylinder with oil cylinder cover 6 and cylinder sleeve 7.The external diameter of tooth bar 10 is littler than cylinder sleeve 7 internal diameters, and tooth bar 10 does not contact with cylinder sleeve 7.Support ring 9 is high-abrasive materials, and the endoporus of cylinder sleeve 7 has improved anti-wear performance through cure process.And whole cylinder sleeve is divided into two joint cylinder sleeves, and cylinder sleeve 7 goes out tail to be fixed 5 by oil cylinder cover 6, prevents to rotate, and removes one section of the centre, and avoid being chewed by pinion on the duplicate gear 3, the sealing ring on piston 8 and the piston is not damaged yet.As mentioned above, piston 8 drives support ring 9, tooth bar 10 moves with the variation of the pressure in the fluid cylinder, rotates thereby drive duplicate gears 3 by tooth bar 10.In said process, tooth bar 10 does not contact with cylinder sleeve 7, thereby tooth bar 10 cylinder sleeve 7 inwalls that do not wear and tear, and has prolonged the application life of cylinder sleeve 7.Among the design, arc notch is not designed at the pinion on the duplicate gear 3 and tooth bar 10 engagement positions, thereby does not exist pinion on the duplicate gear 3 to chew the phenomenon of cylinder sleeve 7.Because the variation of project organization brings cylinder sleeve 7 to shorten, conveniently process simultaneously, precision and hardness also can guarantee.Among the design, as long as after dismantling oil cylinder cover 6, cylinder sleeve 7, piston 8, support ring 9 and tooth bar 10 can take out.
Claims (4)
1. back-up tong driving structure for power tongs, form by tail handle, back-up tong epicranial plate, mandrel, duplicate gear, oil cylinder cover, cylinder sleeve, piston, support ring, tooth bar, it is characterized in that: two external diameters greater than the support ring of tooth bar external diameter from two ends with rack support in cylinder sleeve, and the support ring at tooth bar two ends moves in cylinder sleeve with the piston of two support ring outer ends.
2. as right 1 described a kind of back-up tong driving structure for power tongs, it is characterized in that: cylinder sleeve stretches out tail being fixed by oil cylinder cover.
3. as right 1 described a kind of back-up tong driving structure for power tongs, its feature also is: support ring is a high-abrasive material, and cylinder sleeve bore is through cure process.
4. as right 1 described a kind of back-up tong driving structure for power tongs, its feature also is: described tooth bar does not contact with cylinder sleeve in the moving process in cylinder sleeve all the time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910126131A CN101818626A (en) | 2009-02-27 | 2009-02-27 | Back-up tong driving structure for power tongs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910126131A CN101818626A (en) | 2009-02-27 | 2009-02-27 | Back-up tong driving structure for power tongs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101818626A true CN101818626A (en) | 2010-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910126131A Pending CN101818626A (en) | 2009-02-27 | 2009-02-27 | Back-up tong driving structure for power tongs |
Country Status (1)
| Country | Link |
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| CN (1) | CN101818626A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105064933A (en) * | 2015-08-18 | 2015-11-18 | 江苏申利达机械制造有限公司 | Closed plier combination pliers |
| CN113898299A (en) * | 2021-10-15 | 2022-01-07 | 兰州兰石石油装备工程股份有限公司 | Drilling tool centralizing chuck device |
-
2009
- 2009-02-27 CN CN200910126131A patent/CN101818626A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105064933A (en) * | 2015-08-18 | 2015-11-18 | 江苏申利达机械制造有限公司 | Closed plier combination pliers |
| CN113898299A (en) * | 2021-10-15 | 2022-01-07 | 兰州兰石石油装备工程股份有限公司 | Drilling tool centralizing chuck device |
| CN113898299B (en) * | 2021-10-15 | 2023-07-18 | 兰州兰石石油装备工程股份有限公司 | Chuck device for centralizing drilling tool |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100901 |