CN108678691B - Controllable nondestructive buckling clamp and use method thereof - Google Patents
Controllable nondestructive buckling clamp and use method thereof Download PDFInfo
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- CN108678691B CN108678691B CN201810502898.0A CN201810502898A CN108678691B CN 108678691 B CN108678691 B CN 108678691B CN 201810502898 A CN201810502898 A CN 201810502898A CN 108678691 B CN108678691 B CN 108678691B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/16—Connecting or disconnecting pipe couplings or joints
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/16—Connecting or disconnecting pipe couplings or joints
- E21B19/165—Control or monitoring arrangements therefor
Abstract
The invention provides a controllable nondestructive buckling clamp and a use method thereof, wherein the buckling clamp comprises a hydraulic clamp main body, a hydraulic motor and a reversing valve, wherein an overflow valve and a stop valve (or a ball valve) which are connected in series are arranged between the hydraulic motor and the reversing valve on the hydraulic clamp main body, one end of the stop valve (or the ball valve) is communicated with a connecting channel between the hydraulic motor and the reversing valve, the other end of the stop valve (or the ball valve) is communicated with the overflow valve, and the other end of the overflow valve is communicated with the other connecting channel between the hydraulic motor and the reversing valve; or an overflow valve and a stop valve (or ball valve) are arranged between the hydraulic oil inlet hole of the reversing valve and the hydraulic oil outlet hole of the reversing valve. The invention can realize the control of the rotation torque of the hydraulic pliers by reasonably controlling the pressure of hydraulic oil for driving the hydraulic pliers in the screwing process, thereby achieving the purpose of not damaging screw threads during screwing.
Description
Technical Field
The invention relates to a hydraulic clamp for oilfield workover operation, in particular to a controllable nondestructive screwing clamp, which can prevent screw thread damage caused by misalignment of male and female screw threads in the screw thread screwing process.
Background
When the oil field workover is operated, the existing hydraulic pliers are operated to screw threads (screwing process of screwing up, namely screw threads), the male threads and the female threads are not centered, namely screw threads are eccentrically fastened due to relative shaking of the male threads and the female threads during screwing up, and when the eccentric fastening occurs, the screw threads are forcibly twisted by strong screwing-up power torque of the hydraulic pliers to cause screw thread damage. During normal well workover, when the hydraulic sucker rod tong is particularly used for buckling the sucker rod, screw threads of several to more than ten threads are frequently damaged, so that the sucker rod is scrapped, and thousands to tens of thousands of yuan are lost at a time. In many oil fields, hydraulic sucker rod tongs are not allowed to be used for buckling sucker rods in order to protect the screw threads from damage. And the hydraulic tubing tongs are used for buckling, so that the screw threads of the tubing with different numbers are frequently damaged.
In the oilfield workover industry, although hydraulic pliers capable of controlling pressure are available, the hydraulic pliers can control the maximum torque of tightening, but when the tightening occurs, the torque can still cause screw thread damage. There are also many attempts to solve the problem of damaging the screw threads after the biased fastening occurs in the process of fastening the hydraulic pliers through various ways, but the problem cannot be effectively solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a controllable nondestructive screwing clamp and a using method thereof, and when screwing threads, the clamp can prevent screw thread damage caused by strong hydraulic clamp power torque after the male and female threads are not aligned and deviated.
In order to solve the technical problems, the invention adopts the following technical scheme: the controllable nondestructive buckling clamp comprises a hydraulic clamp main body, a hydraulic motor and a reversing valve, wherein an overflow valve and a stop valve (or a ball valve) are arranged between the hydraulic motor and the reversing valve on the hydraulic clamp main body, the overflow valve and the stop valve (or the ball valve) are connected in series, one end of the stop valve (or the ball valve) is communicated with a connecting channel between the hydraulic motor and the reversing valve, the other end of the stop valve (or the ball valve) is communicated with the overflow valve, and the other end of the overflow valve is communicated with the other connecting channel between the hydraulic motor and the reversing valve; or an overflow valve and a stop valve (or ball valve) are arranged between the hydraulic oil inlet hole of the reversing valve and the hydraulic oil outlet hole of the reversing valve, and the overflow valve and the stop valve (or ball valve) are connected in series.
The set opening pressure range of the overflow valve is 0.5-5 MPa.
The overflow valve and the stop valve (or ball valve) which are connected in series are also connected in parallel with a pressure limiting valve, the pressure limiting valve is arranged between the hydraulic oil inlet hole of the reversing valve and the hydraulic oil outlet hole of the reversing valve, the inlet end of the pressure limiting valve is communicated with the hydraulic oil inlet hole of the reversing valve, the outlet end of the pressure limiting valve is communicated with the hydraulic oil outlet hole of the reversing valve, and the opening pressure of the pressure limiting valve is set to be between 6 and 15 Mpa.
And a check valve is also connected in series on the channel of the overflow valve and/or the channel of the pressure limiting valve.
Further, the overflow valve and the stop valve (or ball valve) are arranged on a module main body, the module main body is fixed on the hydraulic motor, and the reversing valve is fixed on the module main body; the middle part of the module main body is respectively provided with a high-pressure end through hole with a shoulder and a low-pressure end through hole with a shoulder, the high-pressure end through hole is communicated with one hydraulic oil hole of the hydraulic motor and one oil hole of the reversing valve, and the low-pressure end through hole is communicated with the other hydraulic oil hole of the hydraulic motor and the other oil hole of the reversing valve; hydraulic oil circulation connecting channels are respectively arranged between the high-pressure end through hole and the stop valve (or the ball valve), between the low-pressure end through hole and the overflow valve and between the overflow valve and the stop valve (or the ball valve) in the module main body.
The installation direction of the overflow valve is that when the hydraulic pliers are rotated forward to buckle, one end of the stop valve (or the ball valve) is communicated with a through hole at the high pressure end of the module main body, the other end of the stop valve (or the ball valve) is connected with the inlet end of the overflow valve in series, and the outlet end of the overflow valve is communicated with a through hole at the low pressure end of the module main body.
The pressure limiting valve is arranged between the hydraulic motor and the reversing valve, the inlet end of the pressure limiting valve is communicated with a through hole at the high pressure end of the module main body, and the outlet end of the pressure limiting valve is communicated with a through hole at the low pressure end of the module main body.
The pressure limiting valve sets the opening pressure between 6 MPa and 15 MPa.
And a check valve is also connected in series on the channel of the overflow valve and/or the channel of the pressure limiting valve.
The invention discloses a use method of a controllable nondestructive buckling clamp, which comprises the following steps:
when the hydraulic pliers are used for buckling, a stop valve (or ball valve) switch is opened, and a reversing valve handle is operated to enable the hydraulic pliers to start buckling;
in the starting stage of the screwing, if the hydraulic pliers are stopped rotating due to the phenomenon of the eccentric screwing, and after the screw threads are centered in shaking, the hydraulic pliers are continuously operated to screw;
and when the male buckle and the female buckle are normally screwed in after the screw buckle is screwed in for a plurality of circles, when the deviation buckling probability is small, the stop valve (or the ball valve) is closed, the overflow valve stops working, and the reversing valve handle is continuously operated, so that the hydraulic pliers continuously rotate to tighten the screw buckle.
The working principle of the invention is as follows:
in the initial stage of using the hydraulic pliers to buckle, a stop valve (or a ball valve) is opened, the overflow valve works, the pressure of hydraulic oil for driving the hydraulic motor cannot be increased under the action of the overflow valve, the pressure is kept low (0.5-5 MPa), and the hydraulic pliers rotate at low torque. If the male buckle and the female buckle of the screw buckle are not centered (namely, when the male buckle and the female buckle are eccentrically buckled), the rotation of the hydraulic pliers is blocked, the hydraulic oil cannot rise in pressure and cannot increase in torque due to the pressure release effect of the overflow valve, so that the hydraulic pliers can smoothly rotate to be buckled along with the relative shaking of the male buckle and the female buckle when the male buckle and the female buckle of the screw buckle are centered. When the screw threads are about to be fully buckled, the stop valve (or the ball valve) is closed, the overflow valve stops working, the overflow valve stops the pressure limiting function, the pressure of hydraulic oil for driving the hydraulic pliers gradually rises along with the buckling process, the torque of the hydraulic pliers is increased to tighten the screw threads, and the pressure limiting valve limits the highest pressure of the hydraulic pliers not to exceed a preset value, so that the screw threads are not damaged during buckling, and enough power torque is available during buckling.
According to the controllable nondestructive buckling pliers designed by the technical scheme and the application method thereof, the overflow valve and the stop valve (or ball valve) are arranged between the hydraulic motor and the reversing valve or between the hydraulic oil inlet hole of the reversing valve and the hydraulic oil outlet hole of the reversing valve, and are connected in series, so that the control of the rotation torque of the hydraulic pliers can be realized by reasonably controlling the pressure of hydraulic oil driving the hydraulic pliers in the buckling process, and the purpose of not damaging screw threads in the buckling process is achieved. The invention has simple structure, convenient use and remarkable effect.
Drawings
FIG. 1 shows a schematic structure of a controllable nondestructive crimping pliers of the present invention;
FIG. 2 shows a schematic view of the hydraulic circuit of the present invention;
FIG. 3 shows a schematic view of a hydraulic circuit with an additional pressure limiting valve according to the present invention;
FIG. 4 is a schematic view showing the structure of the overflow valve and the shut-off valve of the present invention provided on the module body;
FIG. 5 shows a schematic view of the structure of FIG. 4 in the direction A-A;
FIG. 6 shows a schematic view of the structure of FIG. 4 in the direction B-B;
fig. 7 is a schematic diagram showing the structure of the additional check valve in fig. 4.
In the figure, the hydraulic clamp comprises a 1-hydraulic clamp body, a 2-hydraulic motor, a 3-overflow valve, a 4-stop valve (or ball valve), a 5-reversing valve, a 6-pressure limiting valve, a 7-module body, an 8-screw hole, a 9-high pressure end through hole, a 10-low pressure end through hole, a 11-connecting channel, a 12-connecting channel, a 13-connecting channel, a 14-connecting channel and a 15-uniflow valve.
Detailed Description
The controllable nondestructive buckling pliers and the use method thereof are specifically described below with reference to the accompanying drawings.
The invention relates to a controllable nondestructive buckling clamp embodiment 1, which is shown in fig. 1 to 3, and comprises a hydraulic clamp main body 1, a hydraulic motor 2 and a reversing valve 5 (a pressure gauge is arranged on the reversing valve 5), wherein an overflow valve 3 and a stop valve (or ball valve) 4 are arranged between the hydraulic motor 2 and the reversing valve 5 on the hydraulic clamp main body 1, the overflow valve 3 and the stop valve (or ball valve) 4 are connected in series, one end of the stop valve (or ball valve) 4 is communicated with one connecting channel between the hydraulic motor 2 and the reversing valve 5, the other end of the stop valve (or ball valve) 4 is communicated with the overflow valve 3, and the other end of the overflow valve 3 is communicated with the other connecting channel between the hydraulic motor 2 and the reversing valve 5; or an overflow valve 3 and a stop valve (or ball valve) 4 are arranged between the hydraulic oil inlet of the reversing valve 5 and the hydraulic oil outlet of the reversing valve 5, the overflow valve 3 and the stop valve (or ball valve) 4 are connected in series, one end of the stop valve (or ball valve) 4 is communicated with the hydraulic oil inlet of the reversing valve 5, the other end of the stop valve (or ball valve) 4 is communicated with the overflow valve 3, and the other end of the overflow valve 3 is communicated with the hydraulic oil outlet of the reversing valve 5. The relief valve 3 has a set opening pressure in the range of 0.5-5 Mpa.
In order to further limit the maximum torque of the fastening, the invention perfectly connects a pressure limiting valve 6 in parallel on the overflow valve 3 and the stop valve (or ball valve) 4 which are connected in series, wherein the pressure limiting valve 6 is arranged between the hydraulic motor 2 and the reversing valve 5 or between the hydraulic oil inlet hole of the reversing valve 5 and the hydraulic oil outlet hole of the reversing valve 5. When the pressure limiting valve 6 is arranged in a pipeline between the hydraulic oil inlet hole of the reversing valve 5 and the hydraulic oil outlet hole of the reversing valve 5, the inlet end of the pressure limiting valve 6 is communicated with the hydraulic oil inlet hole of the reversing valve 5, the outlet end of the pressure limiting valve 6 is communicated with the hydraulic oil outlet hole of the reversing valve 5, and the opening pressure of the pressure limiting valve 6 is set to be between 6 and 15MPa, so that the damage to screw threads caused by overlarge fastening torque is avoided.
In the embodiment 2 of the controllable nondestructive screwing pliers of the present invention, referring to fig. 4 to 7, in the structure of embodiment 1, the overflow valve 3 and the shutoff valve (or ball valve) 4 may also be provided on a module body 7. The middle part of the module main body 7 is respectively provided with a high-pressure end through hole 9 with a shoulder and a low-pressure end through hole 10 with a shoulder, the high-pressure end through hole 9 is respectively communicated with one hydraulic oil hole of the hydraulic motor 2 and one hydraulic oil hole of the reversing valve 5 (the high-pressure end through hole 9 is communicated with the hydraulic motor when the hydraulic pliers are buckled and is communicated with the hydraulic oil outlet), and the low-pressure end through hole 10 is also respectively communicated with the other hydraulic oil hole of the hydraulic motor 2 and the other hydraulic oil hole of the reversing valve 5 (the low-pressure end through hole 10 is communicated with the hydraulic motor when the hydraulic pliers are buckled and is communicated with the hydraulic oil inlet when the hydraulic pliers are buckled). A connection passage 12, a connection passage 14, and a connection passage 11 through which hydraulic oil flows are provided between the high-pressure side through hole 9 and the shutoff valve (or ball valve) 4, between the low-pressure side through hole 10 and the relief valve 3, and between the relief valve 3 and the shutoff valve (or ball valve) 4, respectively, in the module main body 7. The module main body 7 is fixed on the hydraulic motor 2 through hollow screws in the high-pressure end through hole 9 and the low-pressure end through hole 10 with shoulders, and the reversing valve 5 is fixed on the module main body 7 by the screw holes 8 and bolts. The installation direction of the overflow valve is that when the hydraulic pliers are rotated forward to buckle, one end of the stop valve (or ball valve) 4 is communicated with a high-pressure end through hole 9 on the module main body 7, the other end of the stop valve (or ball valve) 4 is connected in series with the inlet end of the overflow valve 3, and the outlet end of the overflow valve 3 is communicated with a low-pressure end through hole 10 on the module main body 7.
According to the hydraulic clamp, the overflow valve 3 and the stop valve (or ball valve) 4 which are connected in series are connected in parallel with the module main body 7, the pressure limiting valve 6 is arranged between the hydraulic motor 2 and the reversing valve 5, the inlet end of the pressure limiting valve 6 is communicated with the high-pressure end through hole 9 on the module main body 7, the outlet end of the pressure limiting valve 6 is communicated with the low-pressure end through hole on the module main body 7, a hydraulic oil circulation connecting channel 13 and a connecting channel 14 are respectively arranged between the pressure limiting valve 6 and the high-pressure end through hole 9 and between the pressure limiting valve 6 and the low-pressure end through hole 10, the highest pressure of the hydraulic clamp can be limited between 6 Mpa and 15Mpa, and the damage of screw threads caused by overlarge fastening torque can be avoided.
Referring to fig. 7, the present invention further connects the check valve 15 in series with the passage of the relief valve 3 and/or the pressure limiting valve 6, and when the hydraulic pliers are in the shackle state, the low pressure end through hole 10 is a high pressure hole of hydraulic oil, and the check valve is blocked by the reverse pressure bearing, so that the high pressure cannot be transmitted to the relief valve 3 and the pressure limiting valve 6, and the safety of the reverse pressure bearing of the relief valve 3 and the pressure limiting valve is improved.
Referring to fig. 7, the present invention further connects a single flow valve 15 in series with the channels of the overflow valve 3 and/or the pressure limiting valve 6, in which the single flow valve 15 is shown in series with the channels of the overflow valve 3 and the pressure limiting valve 6, the inlet end of the single flow valve 15 is connected with the outlet end of the overflow valve 3 and the outlet end of the pressure limiting valve 6, and the outlet end of the single flow valve 15 is connected with the through hole 10 of the low pressure end.
When the hydraulic pliers rotate and buckle to rotate positively, hydraulic oil firstly enters from the inlet of the reversing valve 5 through the hydraulic pipeline, and under the action of the reversing valve 5, the hydraulic oil enters into the high-pressure end through hole 9 on the module 7, then enters into the hydraulic motor 2, passes through the other interface of the hydraulic motor 2, and then enters into the outlet of the reversing valve 5 through the low-pressure end through hole 10 on the module 7 to be discharged. In the initial stage of the hydraulic pliers screwing, the stop valve (or ball valve) 4 is opened, the overflow valve 3 works, and the pressure of the hydraulic oil cannot be increased under the action of the overflow valve 3 so as to keep low pressure and rotate with low torque. If the male and female threads of the screw threads are not centered (namely, when the female threads are biased), the rotation of the hydraulic clamp body 1 is blocked, the pressure of hydraulic oil cannot be increased due to the pressure release effect of the overflow valve 3, the torque cannot be increased to stop rotating, along with the relative shaking of the male and female threads, the hydraulic clamp body 1 can smoothly rotate to tightly fasten the screw threads, when the male and female threads of the screw threads are centered, the stop valve (or ball valve) 4 is closed, the overflow valve 3 stops working, the pressure of hydraulic oil can be increased, the torque of the hydraulic motor 2 is increased to tightly fasten the screw threads, the pressure limiting valve 6 works as the pressure continues to be increased to the set pressure of the pressure limiting valve 6, and the limiting pressure does not exceed a preset value, so that the screw threads are not damaged when the screw threads are fastened, and the screw threads can be fastened by the preset torque.
When the hydraulic pliers shackle is reversed, hydraulic oil firstly enters through the oil inlet hole of the reversing valve 5 through the hydraulic pipeline, the reversing valve 5 enables the hydraulic oil to enter the low-pressure end through hole 10 of the module main body 7, the low-pressure end through hole 10 is connected with the outlet end of the overflow valve 3 and the outlet end of the pressure limiting valve 6, the overflow valve 3 and the pressure limiting valve 6 bear pressure reversely, the overflow effect is not achieved, the function of limiting pressure and torque is not achieved, and the hydraulic oil enters the hydraulic motor 2 to perform high-torque shackle operation.
When the hydraulic pliers are in a buckling state, the high-pressure end through hole 9 is a high-pressure oil hole of hydraulic oil, and the uniflow valve 15 is positively conducted; when the hydraulic pliers are in the shackle state, the through hole 10 at the low pressure end is a high pressure hole of hydraulic oil, and the check valve reversely bears pressure to stop, so that high pressure cannot be transmitted to the overflow valve 3 and the pressure limiting valve 6, and the safety of the reverse bearing of the overflow valve 3 and the pressure limiting valve is improved.
The invention discloses a use method of a controllable nondestructive buckling clamp, which comprises the following steps:
when the hydraulic pliers are used for buckling, a stop valve (or ball valve) switch is opened, and a reversing valve handle is operated to enable the hydraulic pliers to start buckling;
in the starting stage of the screwing, if the hydraulic pliers are stopped rotating due to the phenomenon of the eccentric screwing, and after the screw threads are centered in shaking, the hydraulic pliers are continuously operated to screw;
and when the male buckle and the female buckle are normally screwed in after the screw buckle is screwed in for a plurality of circles, when the deviation buckling probability is small, the stop valve (or the ball valve) is closed, the overflow valve stops working, and the reversing valve handle is continuously operated, so that the hydraulic pliers continuously rotate to tighten the screw buckle.
Claims (6)
1. The controllable nondestructive buckling clamp comprises a hydraulic clamp main body, a hydraulic motor and a reversing valve, and is characterized in that an overflow valve and a stop valve are arranged between the hydraulic motor and the reversing valve on the hydraulic clamp main body, the overflow valve and the stop valve are connected in series, one end of the stop valve is communicated with one connecting channel between the hydraulic motor and the reversing valve, the other end of the stop valve is communicated with the overflow valve, and the other end of the overflow valve is communicated with the other connecting channel between the hydraulic motor and the reversing valve; or an overflow valve and a stop valve are arranged between the hydraulic oil inlet hole of the reversing valve and the hydraulic oil outlet hole of the reversing valve, the overflow valve and the stop valve are connected in series, the set opening pressure range of the overflow valve is 0.5-5 MPa, and the controllable nondestructive buckling clamp is characterized in that a pressure limiting valve is connected in parallel on the overflow valve and the stop valve which are connected in series.
2. The controllable nondestructive fastening pliers according to claim 1, wherein the overflow valve and the stop valve are arranged on a module main body, the module main body is fixed on the hydraulic motor, and the reversing valve is fixed on the module main body; the middle part of the module main body is respectively provided with a high-pressure end through hole and a low-pressure end through hole, the high-pressure end through hole is communicated with one hydraulic oil hole of the hydraulic motor and one oil hole of the reversing valve, and the low-pressure end through hole is communicated with the other hydraulic oil hole of the hydraulic motor and the other oil hole of the reversing valve; hydraulic oil circulation connecting channels are respectively arranged between the high-pressure end through hole and the stop valve, between the low-pressure end through hole and the overflow valve and between the overflow valve and the stop valve in the module main body.
3. The controllable nondestructive screwing pliers according to claim 2, wherein the installation direction of the overflow valve is that when the hydraulic pliers are screwed forward, one end of the stop valve is communicated with the through hole of the high-pressure end on the module main body, the other end of the stop valve is connected in series with the inlet end of the overflow valve, and the outlet end of the overflow valve is communicated with the through hole of the low-pressure end on the module main body.
4. The controllable nondestructive buckling clamp according to claim 2, wherein a pressure limiting valve is connected in parallel to the overflow valve and the stop valve which are connected in series on the module main body, the pressure limiting valve is arranged between the hydraulic motor and the reversing valve, the inlet end of the pressure limiting valve is communicated with a through hole of a high pressure end on the module main body, the outlet end of the pressure limiting valve is communicated with a through hole of a low pressure end on the module main body, and the opening pressure of the pressure limiting valve is set to be between 6 and 15 MPa.
5. The controllable non-destructive crimping pliers according to claim 4, further comprising a check valve in series with the relief valve passage and/or the pressure limiting valve passage.
6. A method of using the controllable non-destructive crimping pliers of claim 1 or 2, comprising the steps of:
when the hydraulic pliers are used for buckling, a stop valve switch is opened, and a reversing valve handle is operated to enable the hydraulic pliers to start buckling;
in the starting stage of the screwing, if the hydraulic pliers are stopped rotating due to the phenomenon of the eccentric screwing, and after the screw threads are centered in shaking, the hydraulic pliers are continuously operated to screw;
and when the male buckle and the female buckle are normally screwed in after the screw buckle is screwed in for a plurality of circles, when the deviation buckling probability is small, the stop valve is closed, the overflow valve stops working, and the reversing valve handle is continuously operated, so that the hydraulic pliers continuously rotate to tighten the screw buckle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810502898.0A CN108678691B (en) | 2018-05-23 | 2018-05-23 | Controllable nondestructive buckling clamp and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810502898.0A CN108678691B (en) | 2018-05-23 | 2018-05-23 | Controllable nondestructive buckling clamp and use method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN108678691A CN108678691A (en) | 2018-10-19 |
| CN108678691B true CN108678691B (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810502898.0A Active CN108678691B (en) | 2018-05-23 | 2018-05-23 | Controllable nondestructive buckling clamp and use method thereof |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2373555Y (en) * | 1999-02-25 | 2000-04-12 | 梁伟成 | Hydraulic power pliers with upper buckle torque regulating device |
| CN2637707Y (en) * | 2003-01-09 | 2004-09-01 | 何卫东 | Torque self control type hydraulic oil pipepliers |
| CN201236643Y (en) * | 2008-08-07 | 2009-05-13 | 大庆石油管理局 | Drilling dual-purpose power clamp |
| CN201953327U (en) * | 2011-03-15 | 2011-08-31 | 江苏如石机械有限公司 | Power tongs with low-gear buckling automatic unloading function |
| US20160010406A1 (en) * | 2014-07-08 | 2016-01-14 | Premiere, Inc. | Multi-stage pressure control dump valve assembly for torque control operations |
| CN104791309B (en) * | 2015-03-17 | 2016-04-13 | 江苏中石机械有限公司 | The upper button high and low shift torque control method of power tongs |
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2018
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