CN104476173A - Method for preventing thread pair from sticking in dismounting and mounting of large-diameter threads - Google Patents
Method for preventing thread pair from sticking in dismounting and mounting of large-diameter threads Download PDFInfo
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- CN104476173A CN104476173A CN201410681497.8A CN201410681497A CN104476173A CN 104476173 A CN104476173 A CN 104476173A CN 201410681497 A CN201410681497 A CN 201410681497A CN 104476173 A CN104476173 A CN 104476173A
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- thread
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- fluid cylinder
- control system
- bracing frame
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- 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
- B23P19/06—Screw or nut setting or loosening machines
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- Mechanical Engineering (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The invention discloses a method for preventing a thread pair from sticking in dismounting and mounting of large-diameter threads. The method comprises the steps that an overflowing valve is adjusted to enable the supplied pressure of a hydraulic-control system to be slightly less than the weight of a pin thread component during screwing threads, then excessive hydraulic oil in a supporting hydraulic cylinder overflows through the overflowing valve, and accordingly, a piston rod slowly retracts and a supporting frame lowers down, the pin thread component is lowered down and slowly rotated at the same time, and the pressure of the hydraulic-control system is kept unchanged; when dismounting the threads, the pressure of a constant-pressure variable pump is regulated to enable the supplied pressure of the hydraulic-control system to be slightly more than the weight of the pin thread component, the piston piton slowly extends out, the constant-pressure variable pump synchronously supplements hydraulic oil as the piston rod extends out, and accordingly, the supporting frame raises, the pin thread component is slowly rotated to upwards move to be separated from a box thread component, and the pressure of the hydraulic-control system is kept unchanged. The method is simple and easy to be carried out, and the force is uniformly applied to the threads, so that the threads are difficultly damaged and stuck.
Description
Technical field
The invention belongs to machinery manufacturing technology field, prevent screw thread pair thread gluing for during large-diameter thread dismounting, the dismounting of the Large-scale thread of particularly major diameter heavy duty, when being specifically related to a kind of large-diameter thread dismounting, prevent the method for screw thread pair thread gluing.
Background technology
Being threaded is connected mode conventional between each parts in plant equipment, and because having, easy accessibility, carrying are large, plurality of advantages such as centering is good and being used widely between connector., in some major diameters, heavily loaded screw thread disassembly process, by the impact of equipment dead weight, there is centering difference when level docking is fastening, simultaneously by the impact of connector appearance and size, cause equipment to clamp in many advantages although be threaded, not easy to operate; Because the frictional force between screw thread pair is large when vertical docking is fastening, often causes screw thread pair thread gluing, sintering, finally cause screw thread to dismantle.Such as, the 27 〞 STUB-ACME adopted between underwater horizontal type production tree and the hydraulic connector of bottom are threaded, must first by production tree and hydraulic connector connecting thread is fastening puts in place before entering underwater operation, and production tree gross weight reaches 55 tons, impact by production tree appearance and size cannot adopt level to dock binding thread, adopt and vertically dock the method tightened, advantage is that centering is good, shortcoming is the impact that connecting thread is subject to subsea production tree dead weight, cause the frictional force between screw thread pair large, screw thread pair thread gluing sinters, and finally causes screw thread to dismantle.
Summary of the invention
The method of screw thread pair thread gluing is prevented when the object of this invention is to provide a kind of large-diameter thread dismounting, solve the impact of the equipment dead weight existed in prior art, cause the frictional force between screw thread pair large, screw thread pair thread gluing sinters, and finally causes the problem that screw thread cannot be dismantled.
The technical solution adopted in the present invention is, prevents the method for screw thread pair thread gluing during a kind of large-diameter thread dismounting, implements according to following steps:
By the male thread workpiece needing to connect and box thread workpiece according to male thread upper, box thread under locus put well and align, arrange at box thread inner hole of workpiece and support fluid cylinder and bracing frame, in support fluid cylinder, hydraulic oil is squeezed into constant pressure variable displacement pump, promotion bracing frame moves up, until bracing frame upper surface and male thread workpiece lower surface hold out against laminating
During screw thread spinner, adjustment overflow valve makes the voltage supply of hydraulic control system be slightly less than the weight of male thread workpiece, support unnecessary hydraulic oil in fluid cylinder to be overflowed by overflow valve, piston rod slowly bounces back thereupon, bracing frame declines thereupon, while transfer male thread workpiece limit slowly rotate male thread workpiece, hydraulic control system pressure is constant all the time;
During dismounting screw thread, the pressure of adjustment constant pressure variable displacement pump, make the voltage supply of hydraulic control system slightly larger than the weight of male thread workpiece, piston rod slowly stretches out, constant pressure variable displacement pump stretches out synchronous replenisher force feed with piston rod, bracing frame is lifting thereupon, and slowly rotation male thread workpiece is up simultaneously throws off with box thread workpiece, and hydraulic control system pressure is constant all the time.
Prevent the method for screw thread pair thread gluing during large-diameter thread dismounting of the present invention, its feature is also:
The structure of mechanism for assembling-disassembling is, male thread workpiece and box thread workplace vertical align, and male thread workpiece is upper, box thread workpiece under; In box thread inner hole of workpiece, be provided with fluid cylinder base, fluid cylinder base be provided with support fluid cylinder, the piston rod supporting fluid cylinder upwards adopts ball-type hinged with bracing frame, the upper surface of bracing frame and male thread workpiece lower surface apical grafting; The oil-in supporting fluid cylinder is communicated with constant pressure variable displacement pump, overflow valve simultaneously, and the connecting line supported between fluid cylinder and hydraulic control system is drawn by fluid cylinder base, utilizes constant pressure variable displacement pump to carry out voltage supply, utilize overflow valve to carry out pressure regulation in hydraulic control system.
The structure of bracing frame is, comprise the lower carriage hinged with piston rod end ball-type, lower carriage upwards has upper bracket by bearings.
Support mode with bolts between fluid cylinder and fluid cylinder base.
The invention has the beneficial effects as follows, because of equipment dead weight when effectively can avoid screw thread dismounting, cause the frictional force on screw thread pair to increase, cause connecting thread to occur thread gluing, sintering phenomenon.Concrete feature is:
1) normal pressure on screw thread pair surface in spinner process can be effectively reduced, thus significantly reduce the frictional force between screw thread, the thread gluing avoiding to greatest extent occurring during screw threads for fastening, burn phenomenon to death.
2) replacing bracing frame and fluid cylinder base can meet the dismounting requirement of different size screw thread.
Accompanying drawing explanation
Fig. 1 is the mechanism for assembling-disassembling schematic diagram in working order that the inventive method adopts;
Fig. 2 is the hinged schematic diagram of ball-type of bracing frame and piston rod in the mechanism for assembling-disassembling of the inventive method employing.
In figure, 1. bracing frame, 2. supports fluid cylinder, 3. hydraulic control system, 4. fluid cylinder base, 5. upper bracket, 6. bearing, 7. lower carriage, 8. piston rod, 9. constant pressure variable displacement pump, 10. overflow valve, 11. male thread workpiece, 12. box thread workpiece.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
With reference to Fig. 1, the structure of the mechanism for assembling-disassembling that the inventive method adopts is that male thread workpiece 11 and box thread workpiece 12 vertically align, and male thread workpiece 11 is upper, box thread workpiece 12 under; In box thread workpiece 12 endoporus, be provided with fluid cylinder base 4, fluid cylinder base 4 be provided with and support fluid cylinder 2, the piston rod 8 supporting fluid cylinder 2 upwards adopts ball-type hinged with bracing frame 1, the upper surface of bracing frame 1 and male thread workpiece 11 lower surface apical grafting; The oil-in supporting fluid cylinder 2 is communicated with constant pressure variable displacement pump 9, overflow valve 10 simultaneously, and the connecting line supported between fluid cylinder 2 and hydraulic control system 3 is drawn by fluid cylinder base 4, utilizes constant pressure variable displacement pump 9 to carry out voltage supply, utilize overflow valve 10 to carry out pressure regulation in hydraulic control system.
With reference to Fig. 2, the structure of bracing frame 1 is, comprise the lower carriage 7 hinged with piston rod 8 termination ball-type, lower carriage 7 is upwards supported with upper bracket 5 by bearing 6, and bearing 6 can reduce the friction in screw thread spinner process between male thread workpiece 11 and box thread workpiece 12 while satisfied carrying as far as possible.
Bracing frame 1 is changed according to the appearance and size of male thread workpiece 11, weight, meets the dismounting requirement of different size workpiece.Be that ball-type is hinged between bracing frame 1 and support liquid cylinder piston bar 8, can the disalignment situation between double thread pair and support fluid cylinder 2 compensate.
Support mode with bolts between fluid cylinder 2 and fluid cylinder base 4, can be changed according to the difference of the shape of box thread workpiece 12 and height, meet the instructions for use of products of different specifications.
In spinner process, no matter be fastening or dismounting, the voltage supply maintenance of hydraulic control system 3 is stablized constant.
The course of work of the inventive method is, utilizes above-mentioned mechanism for assembling-disassembling, implements according to following steps:
By the male thread workpiece 11 needing to connect and box thread workpiece 12 according to male thread upper, box thread under locus put well and align, arrange at box thread workpiece 12 endoporus and support fluid cylinder 2 and bracing frame 1, in support fluid cylinder 2, hydraulic oil is squeezed into constant pressure variable displacement pump 9, promote bracing frame 1 to move up, until bracing frame 1 upper surface and male thread workpiece 11 lower surface hold out against laminating
During screw thread spinner, adjustment overflow valve 10 makes the voltage supply of hydraulic control system 3 be slightly less than the weight of male thread workpiece 11, support unnecessary hydraulic oil in fluid cylinder 2 to be overflowed by overflow valve 10, piston rod 8 slowly bounces back thereupon, bracing frame 1 declines thereupon, while transfer male thread workpiece 11 limit slowly rotate male thread workpiece 11, hydraulic control system 3 pressure is constant all the time;
During dismounting screw thread, the pressure of adjustment constant pressure variable displacement pump 9, make the voltage supply of hydraulic control system 3 slightly larger than the weight of male thread workpiece 11, piston rod 8 slowly stretches out, constant pressure variable displacement pump 9 stretches out synchronous replenisher force feed with piston rod 8, bracing frame 1 lifting thereupon, slowly rotation male thread workpiece 11 is up simultaneously throws off with box thread workpiece 12, and hydraulic control system 3 pressure is constant all the time.
Claims (4)
1. prevent a method for screw thread pair thread gluing during large-diameter thread dismounting, its feature is, implements according to following steps:
By the male thread workpiece (11) needing to connect and box thread workpiece (12) according to male thread upper, box thread under locus put well and align, arrange at box thread workpiece (12) endoporus and support fluid cylinder (2) and bracing frame (1), in support fluid cylinder (2), hydraulic oil is squeezed into constant pressure variable displacement pump (9), promote bracing frame (1) to move up, until bracing frame (1) upper surface and male thread workpiece (11) lower surface hold out against laminating
During screw thread spinner, adjustment overflow valve (10) makes the voltage supply of hydraulic control system (3) be slightly less than the weight of male thread workpiece (11), support hydraulic oil unnecessary in fluid cylinder (2) to be overflowed by overflow valve (10), piston rod (8) slowly bounces back thereupon, bracing frame (1) declines thereupon, while transfer male thread workpiece (11) limit slowly rotate male thread workpiece (11), hydraulic control system (3) pressure is constant all the time;
During dismounting screw thread, the pressure of adjustment constant pressure variable displacement pump (9), make the weight of voltage supply slightly larger than male thread workpiece (11) of hydraulic control system (3), piston rod (8) slowly stretches out, constant pressure variable displacement pump (9) stretches out synchronous replenisher force feed with piston rod (8), bracing frame (1) lifting thereupon, slowly rotation male thread workpiece (11) is up simultaneously throws off with box thread workpiece (12), and hydraulic control system (3) pressure is constant all the time.
2. during large-diameter thread dismounting according to claim 1, prevent the method for screw thread pair thread gluing, its feature is: the structure of described mechanism for assembling-disassembling is, male thread workpiece (11) and box thread workpiece (12) vertically align, and male thread workpiece (11) is upper, box thread workpiece (12) under; Fluid cylinder base (4) is provided with in box thread workpiece (12) endoporus, fluid cylinder base (4) is provided with and supports fluid cylinder (2), the piston rod (8) supporting fluid cylinder (2) upwards adopts ball-type hinged with bracing frame (1), the upper surface of bracing frame (1) and male thread workpiece (11) lower surface apical grafting; The oil-in supporting fluid cylinder (2) is communicated with constant pressure variable displacement pump (9), overflow valve (10) simultaneously, the connecting line supported between fluid cylinder (2) and hydraulic control system (3) is drawn by fluid cylinder base (4), utilize constant pressure variable displacement pump (9) to carry out voltage supply in hydraulic control system, utilize overflow valve (10) to carry out pressure regulation.
3. during large-diameter thread dismounting according to claim 2, prevent the method for screw thread pair thread gluing, its feature is: the structure of described bracing frame (1) is, comprise the lower carriage (7) hinged with piston rod (8) termination ball-type, lower carriage (7) is upwards supported with upper bracket (5) by bearing (6).
4. prevent the method for screw thread pair thread gluing during large-diameter thread dismounting according to claim 2, its feature is: mode with bolts between described support fluid cylinder (2) and fluid cylinder base (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410681497.8A CN104476173B (en) | 2014-11-24 | 2014-11-24 | A kind of method preventing screw thread pair thread gluing during large-diameter thread dismounting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410681497.8A CN104476173B (en) | 2014-11-24 | 2014-11-24 | A kind of method preventing screw thread pair thread gluing during large-diameter thread dismounting |
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| Publication Number | Publication Date |
|---|---|
| CN104476173A true CN104476173A (en) | 2015-04-01 |
| CN104476173B CN104476173B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410681497.8A Active CN104476173B (en) | 2014-11-24 | 2014-11-24 | A kind of method preventing screw thread pair thread gluing during large-diameter thread dismounting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107476772A (en) * | 2017-09-06 | 2017-12-15 | 宝鸡石油机械有限责任公司 | It is a kind of using large-diameter thread installation method of the spring balancing than pressure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5184805A (en) * | 1990-10-16 | 1993-02-09 | Framatome | Device for the optimum positioning of an extension piece on a threaded connection element |
| EP0644978B1 (en) * | 1992-06-16 | 1997-01-08 | Weatherford/Lamb, Inc. | Apparatus for connecting and disconnecting threaded members |
| CN2398416Y (en) * | 1999-09-18 | 2000-09-27 | 甘肃环球能源节能技术开发设计研究所有限公司 | Gravitational balance Six-D free float rotating tightening unit head |
| CN101659006A (en) * | 2009-09-11 | 2010-03-03 | 中国石化集团第十建设公司 | Piston dismounting machine of oil cylinder seal head |
| CN101832115A (en) * | 2010-04-30 | 2010-09-15 | 中国地质大学（武汉） | High-torque hydraulic pipe-wrenching machine for wrenching and disassembling outer-flat drilling rod |
-
2014
- 2014-11-24 CN CN201410681497.8A patent/CN104476173B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5184805A (en) * | 1990-10-16 | 1993-02-09 | Framatome | Device for the optimum positioning of an extension piece on a threaded connection element |
| EP0644978B1 (en) * | 1992-06-16 | 1997-01-08 | Weatherford/Lamb, Inc. | Apparatus for connecting and disconnecting threaded members |
| CN2398416Y (en) * | 1999-09-18 | 2000-09-27 | 甘肃环球能源节能技术开发设计研究所有限公司 | Gravitational balance Six-D free float rotating tightening unit head |
| CN101659006A (en) * | 2009-09-11 | 2010-03-03 | 中国石化集团第十建设公司 | Piston dismounting machine of oil cylinder seal head |
| CN101832115A (en) * | 2010-04-30 | 2010-09-15 | 中国地质大学（武汉） | High-torque hydraulic pipe-wrenching machine for wrenching and disassembling outer-flat drilling rod |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107476772A (en) * | 2017-09-06 | 2017-12-15 | 宝鸡石油机械有限责任公司 | It is a kind of using large-diameter thread installation method of the spring balancing than pressure |
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| CN104476173B (en) | 2016-08-24 |
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