CN111075369A - Return-stroke-free tubular column tripping device and under-pressure operation system - Google Patents
Return-stroke-free tubular column tripping device and under-pressure operation system Download PDFInfo
- Publication number
- CN111075369A CN111075369A CN201911341824.4A CN201911341824A CN111075369A CN 111075369 A CN111075369 A CN 111075369A CN 201911341824 A CN201911341824 A CN 201911341824A CN 111075369 A CN111075369 A CN 111075369A
- Authority
- CN
- China
- Prior art keywords
- return
- rollers
- roller
- assembly
- free pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 14
- 239000008188 pellet Substances 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 239000003921 oil Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B19/10—Slips; Spiders ; Catching devices
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The return-stroke-free tubular column tripping device comprises a roller assembly, a driving assembly and a pushing assembly, wherein the roller assembly is provided with two rollers, a tubular column can be clamped between the roller surfaces of the two rollers, and the tubular column is clamped and conveyed by rolling of the two rollers; the driving assembly can drive the two rollers to roll; and the pushing assembly can drive the two rollers to slide relatively so as to provide clamping force for the tubular column. Therefore, the return-stroke-free pipe column tripping device is applied to a pressurized operation system, can complete continuous tripping operation of a pipe column, obviously improves the operation efficiency, simplifies the pressurized operation structure, and reduces the volume and weight of the system.
Description
Technical Field
The invention relates to the field of oil-water well maintenance equipment, in particular to a return-stroke-free pipe column tripping device and a pressurized operation system.
Background
In the process of maintaining an oil (water) well, the extraction or the setting of a pipe column is inevitable, and in the face of large batch of pipe columns, the pipe columns need to be extracted or set from the well, the prior art combines a lifting oil cylinder, a traveling beam, a slip set and the like of a pressurized operation system together, and the pipe columns are lifted out or set down by the up-and-down reciprocating process of the lifting oil cylinder. However, only a single stroke is in effect in the up-and-down reciprocating process of the lifting oil cylinder, and the return stroke process of the oil cylinder is in idle work, so the working efficiency of the oil cylinder is very low. Therefore, the combined design of the lifting oil cylinder, the traveling beam and the slip set leads to the increase of the overall height, width and weight of the existing under-pressure operation system, and the transportation process is also inconvenient and limited.
Therefore, there is a need to develop a new pulling-down power device capable of completely replacing a lift cylinder, a traveling beam and a slip set, so as to thoroughly change the current operation structure under pressure and improve the efficiency thereof, thereby realizing a revolutionary breakthrough.
Disclosure of Invention
Accordingly, the present invention is directed to a return-free pipe tripping device and a pressurized operating system, which solve at least one of the above-mentioned problems.
In order to achieve the purpose, the technical scheme of the invention is as follows:
according to one aspect of the invention, a return-free pipe string tripping device is provided, which comprises a roller assembly, a driving assembly and a pushing assembly, wherein: the pipe column clamping device comprises a roller assembly and a clamping device, wherein the roller assembly is provided with two rollers, a pipe column can be clamped between the roller surfaces of the two rollers, and the pipe column is clamped and conveyed by the rolling of the two rollers; the driving assembly can drive the two rollers to roll; and the pushing assembly can drive the two rollers to slide relatively so as to provide clamping force for the tubular column.
According to another aspect of the invention, a pressurized operation system is provided, which comprises two return-free pipe string tripping devices as described above, which are arranged in series up and down to complete tripping operation on a pipe string in a well.
According to the technical scheme, the return-free pipe column tripping device and the under-pressure operation system have at least one or part of the following beneficial effects:
(1) the weight is light: compared with the traditional oil cylinder, the traveling beam and the slip group, the return-stroke-free pipe string tripping device has the advantages that the net weight of a single unit is 850Kg, and the weight is greatly reduced when the total weight is not less than 3000 Kg.
(2) Small, practice thrift the space: if the device is arranged on a pressurized operation system to replace a lifting oil cylinder, a traveling beam, a slip set and the like, the length, the width and the height of the device are greatly reduced. In the traditional operation system with pressure, if the lifting oil cylinder, the traveling beam and the slip set are removed, the height can be reduced by more than 2 meters. The height of the return-free pipe column tripping device is changed to be not more than 0.9 m, and particularly, the total height of two return-free pipe column tripping devices which are vertically butted through bolts when in use is not more than 0.9 m.
(3) The efficiency is high: the traditional oil cylinder needs a load moving beam, a slip set and the like, the operation purpose is realized by reciprocating up and down, and the efficiency is less than 50%. Compared with the traditional oil cylinder, the return-stroke-free pipe column tripping device has no load, and the pipe column is continuously driven to trip through the roller without return stroke, so that the efficiency is obviously improved.
(4) The energy consumption is low: compared with the lifting oil cylinder in the traditional pressurized operation system, the liquid consumption (hydraulic oil) is reduced by more than 30 percent.
(5) The structure is relatively simple, the equipment maintenance and the maintenance are convenient, the whole structure is composed of the roller assembly, the driving assembly and the pushing assembly, and the disassembly and the assembly are not influenced mutually.
Drawings
FIG. 1 is a perspective view of a trip-free pipe tripping apparatus in accordance with an embodiment of the present invention;
FIG. 2 is a perspective view of the return-free pipe tripping apparatus of the present invention with the housing removed;
FIG. 3A is a perspective view of a roll in accordance with an embodiment of the present invention;
FIG. 3B is a cross-sectional view of FIG. 3A;
FIG. 4 is a front view of a return-free pipe tripping apparatus according to an embodiment of the present invention;
FIG. 5 is a partial cross-sectional view of a return-free pipe tripping apparatus according to an embodiment of the present invention;
FIG. 6 is a cross-sectional view A-A of FIG. 5;
FIG. 7 is a perspective view of a housing of an embodiment of the present invention;
FIG. 8 is a schematic diagram of a tandem connection of two return-free pipe tripping devices of a belt pressure operating system in accordance with an embodiment of the present invention.
Detailed Description
The invention provides a return-stroke-free pipe column tripping device and a pressurized operation system. Therefore, the structure of the existing under-pressure operation system is thoroughly changed, the situation that the lifting oil cylinder, the moving beam and the slip set are required to be arranged in the under-pressure operation is completely solved, the volume, the weight and the like of the under-pressure operation are greatly reduced, two lifting devices are adopted and installed at the top of the under-pressure operation system, the extraction/running-in operation of the pipe column can be completely realized in the well repairing process, and the operation efficiency is greatly improved.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
In one exemplary embodiment of the present invention, a return-free pipe string tripping apparatus is provided. As shown in fig. 1 and 2, the return-free pipe tripping device of the present embodiment includes: the pipe string clamping device comprises a roller assembly 20, a driving assembly 40 and a pushing assembly 30, wherein the roller assembly 20 is provided with two rollers 21, a pipe string (not shown) can be clamped between the roller surfaces of the two rollers 21, and the pipe string is clamped and conveyed by the rolling of the two rollers 21; a drive assembly 40 capable of driving the two rollers 21 to roll; the pushing assembly 30 can push the two rollers 21 to slide relatively to provide a clamping force to the pipe string.
The following describes each component of the return-free pipe tripping device in detail.
As shown in fig. 3A, 3B, the gripping surfaces of the rollers 21 for gripping the pipe column are configured in multiple radii, and the radii of the gripping surfaces are gradually reduced in the inwardly curved direction. For example, in the embodiment, two cambered surfaces with the connected radii of R2 and R1 are arranged in the inward bending direction of the clamping surface, wherein R2> R1, so that the pipe column with different diameters can be accommodated. Preferably, hard alloy particles are spray-welded on the clamping surface of the roller 21, so that the friction force and the wear resistance are ensured, and the pipe column can be held tightly.
As shown in fig. 4-6, the driving assembly 40 includes two worm gear reducers 41 corresponding to the two rollers 21, respectively, and the structure of the worm gear reducers is well known in the art, and can provide power and large torque for the rollers. An involute gear 23 is provided on the rotation main shaft 22 of the roller 21, an involute gear 412 is provided on the output shaft 411 of the worm gear reducer 41, and the involute gears 23, 412 are engaged with each other, whereby the roller 21 is driven to rotate by the worm gear reducer 41. The involute gear is one of gears and has the advantage of constant angular velocity.
In this embodiment, the driving assembly 40 further includes two hydraulic motors 43 respectively corresponding to the two worm gear reducers 41, and the two hydraulic motors 43 are connected to the input shaft of the worm gear reducers 41 through the motor connecting flange 42, and provide power for the rolling of the rolling roller 21.
In the embodiment, by utilizing the irreversibility of the main power of the worm gear speed reducer 41, in the working state, after the rolling roller stops rotating, as long as the holding force on the pipe column is not removed, the rolling roller cannot slide, and when pressure exists at the bottom of an oil-water well, the pipe column cannot fly out.
In this embodiment, the roller assembly 20 further includes two roller supports 24 respectively corresponding to the two rollers 21, and the rollers 21 and the worm gear reducer 41 are respectively connected to the corresponding roller supports 24. The roller 21 is connected to the roller holder 24 through a bearing, and the worm gear reducer 41 is connected to the roller holder 24 through a connecting flange 413.
At this time, the pushing assembly 30 includes two hydraulic cylinders respectively corresponding to the two rollers 21, and the structure thereof is well known in the art, for providing a driving force for the rollers 21 to relatively slide. The hydraulic cylinder has a piston rod 32, and the piston rod 32 is fixed to the corresponding roller bracket 24, so that the roller bracket 24 and the roller 21 connected thereto are moved together by the actuation of the piston rod 32.
As shown in fig. 5 and 6, the two hydraulic cylinders are respectively located at the left and right sides of the roller assembly 20, in this embodiment, the two hydraulic cylinders are fixed at the left and right sides of a casing 10, the hydraulic cylinders further include a locking shaft 31, a side door 33, a cylinder sleeve 34, a cylinder cover 35 and an oil inlet flange 36, the locking shaft 31 is screwed into the piston rod 32 and is matched with the cylinder cover 35, an oil inlet cavity and an oil return cavity are defined between the cylinder sleeve 34, the cylinder cover 35, the piston rod 32 and the side door 33, oil is fed or returned into the oil inlet cavity through the oil inlet flange 36, so that power for stretching and retracting the piston rod 32 is provided, and the roller assembly is hydraulically pushed.
At this time, during operation, the roller 21 is driven by a hydraulic cylinder to slide oppositely to provide holding force to the pipe column, and according to the well-known hydraulic cylinder operating principle, when the roller 21 clamps the pipe column, if the roller 21 touches a large-diameter tool section, the roller 21 slides reversely under the reaction thrust to ensure that the large-diameter tool section can pass through; when the operation needs to be stopped, the locking shafts 31 on the two sides can be manually rotated according to the well-known hydraulic cylinder locking principle, so that the roller 21 keeps the state of tightly holding the pipe column, and the hydraulic power source can be turned off to keep the long-term clamping force.
As shown in fig. 7, the return-stroke-free pipe string tripping device further includes a housing 10, which is disposed outside the roller assembly 20, and adopts a hollow design, so that the weight of the device is greatly reduced without affecting the strength. The roller bracket 24 of the roller assembly 20 is connected with the housing 10 in a sliding way, specifically, the sliding way 11 is arranged between the roller bracket 24 and the housing 10, and at this time, the roller assembly 20 is not in direct contact with the housing 10, which not only ensures that the roller assembly 20 does not directly generate friction with the housing 10, but also reduces the friction resistance.
In this embodiment, the housing 10 is provided with an abutting portion, and the two return-free pipe column tripping devices are abutted up and down through the abutting portion to form a serial structure as shown in fig. 8. Specifically, a plurality of corresponding bolt holes may be provided in the abutting portion of the two return-free pipe tripping devices, and the two return-free pipe tripping devices may be connected in series up and down by bolts passing through the bolt holes.
In another exemplary embodiment of the present invention, a pressurized operation system is further provided, which includes two return-free pipe string tripping devices as described above, which are connected in series, and limit a pipe string in a vertical direction, and replace a lift cylinder, a traveling beam and a slip set in the system during a workover process, so as to realize continuous extraction/tripping operation of the pipe string, and greatly improve operation efficiency. For example, the two return-free pipe string tripping devices are connected in series, so that the two return-free pipe string tripping devices can be coaxially aligned, and a pipe string can be stably limited in the vertical direction.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a exempt from return stroke tubular column and play device down which characterized in that, rolls roller assembly, drive assembly and promotes the assembly, wherein:
the pipe column clamping device comprises a roller assembly and a clamping device, wherein the roller assembly is provided with two rollers, a pipe column can be clamped between the roller surfaces of the two rollers, and the pipe column is clamped and conveyed by the rolling of the two rollers;
the driving assembly can drive the two rollers to roll;
and the pushing assembly can drive the two rollers to slide relatively so as to provide clamping force for the tubular column.
2. The return-free pipe string tripping apparatus of claim 1, wherein the gripping surfaces of the roller surfaces for gripping the pipe string are configured as multiple radii, and wherein the radii of the gripping surfaces taper in an inwardly curved direction.
3. The return-free pipe string tripping device of claim 2, wherein the gripping surface is spray welded with cemented carbide pellets.
4. The return-stroke-free pipe column tripping device is characterized in that the driving assembly comprises two turbine worm speed reducers corresponding to the two rolling rollers respectively, and rotating main shafts of the rolling rollers are meshed with output shafts of the corresponding turbine worm speed reducers through involute gears.
5. The return-free pipe string tripping apparatus of claim 4, wherein the drive assembly further comprises two hydraulic motors corresponding to the two worm gear reducers, respectively, the hydraulic motors being connected to the input shafts of the worm gear reducers.
6. The return-stroke-free pipe column tripping device as recited in claim 4, wherein the roller assembly further comprises two roller supports corresponding to the rollers, respectively, and the rollers and the worm gear reducer are connected to the corresponding roller supports, respectively.
7. The return-free pipe string tripping device of claim 6, wherein the pushing assembly comprises two hydraulic cylinders corresponding to the two rollers, respectively, the hydraulic cylinders having piston rods fixed to the corresponding roller supports.
8. The return-free pipe string tripping device of claim 7, further comprising a housing disposed outside the roller assembly, wherein the roller bracket is connected to the housing in a sliding manner, and the two hydraulic cylinders are respectively fixed to two sides of the housing.
9. The return-free pipe tripping apparatus of claim 8, wherein said housing is provided with an interface portion such that two of said return-free pipe tripping apparatuses are connected up and down by said interface portion.
10. A work under pressure system comprising two return-free pipe string tripping devices according to any of claims 1 to 9 arranged in series one above the other to trip a pipe string in a well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911341824.4A CN111075369A (en) | 2019-12-26 | 2019-12-26 | Return-stroke-free tubular column tripping device and under-pressure operation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911341824.4A CN111075369A (en) | 2019-12-26 | 2019-12-26 | Return-stroke-free tubular column tripping device and under-pressure operation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111075369A true CN111075369A (en) | 2020-04-28 |
Family
ID=70316940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911341824.4A Pending CN111075369A (en) | 2019-12-26 | 2019-12-26 | Return-stroke-free tubular column tripping device and under-pressure operation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111075369A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115012858A (en) * | 2022-06-29 | 2022-09-06 | 中国地质科学院勘探技术研究所 | Power device capable of continuously lowering pipe column |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW516407U (en) * | 2001-08-31 | 2003-01-01 | Prime Occupation Co Ltd | Structure of clamping seat capable of clamping pipes with different specification diameter |
| CN101457636A (en) * | 2009-01-05 | 2009-06-17 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Reducing slip for tube fastener for oil tube |
| CN101806198A (en) * | 2010-04-22 | 2010-08-18 | 中国石油化工股份有限公司 | Wheel type slip continuous loading device operating under pressure |
| CN202081842U (en) * | 2011-05-23 | 2011-12-21 | 中国石油天然气股份有限公司 | Pressing mechanism on continuous oil pipe traction equipment |
| CN203452679U (en) * | 2013-08-23 | 2014-02-26 | 四川宏华石油设备有限公司 | Roller clamping device for drilling tools |
| CN204252877U (en) * | 2014-11-19 | 2015-04-08 | 临朐利晟石油机械设备有限公司 | A kind of oil well oil pipe works auxiliary coaster of going into the well |
| CN204592575U (en) * | 2014-03-31 | 2015-08-26 | 神钢建机株式会社 | Clamp structure |
| CN105507828A (en) * | 2016-01-21 | 2016-04-20 | 赤峰市浩峰钻机有限责任公司 | Roller-type clamp |
| CN105888582A (en) * | 2016-04-26 | 2016-08-24 | 中国石油集团渤海石油装备制造有限公司 | Double-control tubing device for petroleum workover operation and using method thereof |
| CN205638287U (en) * | 2016-05-25 | 2016-10-12 | 赤峰市浩峰钻机有限责任公司 | Roller type holder |
| CN207686628U (en) * | 2017-12-21 | 2018-08-03 | 大连惠德自动化设备有限公司 | A kind of auxiliary suitable for workover treatment with pressure removes tube apparatus |
-
2019
- 2019-12-26 CN CN201911341824.4A patent/CN111075369A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW516407U (en) * | 2001-08-31 | 2003-01-01 | Prime Occupation Co Ltd | Structure of clamping seat capable of clamping pipes with different specification diameter |
| CN101457636A (en) * | 2009-01-05 | 2009-06-17 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Reducing slip for tube fastener for oil tube |
| CN101806198A (en) * | 2010-04-22 | 2010-08-18 | 中国石油化工股份有限公司 | Wheel type slip continuous loading device operating under pressure |
| CN202081842U (en) * | 2011-05-23 | 2011-12-21 | 中国石油天然气股份有限公司 | Pressing mechanism on continuous oil pipe traction equipment |
| CN203452679U (en) * | 2013-08-23 | 2014-02-26 | 四川宏华石油设备有限公司 | Roller clamping device for drilling tools |
| CN204592575U (en) * | 2014-03-31 | 2015-08-26 | 神钢建机株式会社 | Clamp structure |
| CN204252877U (en) * | 2014-11-19 | 2015-04-08 | 临朐利晟石油机械设备有限公司 | A kind of oil well oil pipe works auxiliary coaster of going into the well |
| CN105507828A (en) * | 2016-01-21 | 2016-04-20 | 赤峰市浩峰钻机有限责任公司 | Roller-type clamp |
| CN105888582A (en) * | 2016-04-26 | 2016-08-24 | 中国石油集团渤海石油装备制造有限公司 | Double-control tubing device for petroleum workover operation and using method thereof |
| CN205638287U (en) * | 2016-05-25 | 2016-10-12 | 赤峰市浩峰钻机有限责任公司 | Roller type holder |
| CN207686628U (en) * | 2017-12-21 | 2018-08-03 | 大连惠德自动化设备有限公司 | A kind of auxiliary suitable for workover treatment with pressure removes tube apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 仲崇生: "《 机械设计基础》", 31 August 2011 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115012858A (en) * | 2022-06-29 | 2022-09-06 | 中国地质科学院勘探技术研究所 | Power device capable of continuously lowering pipe column |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201567978U (en) | Injection head of coiled tubing | |
| CN102284852A (en) | Semi-automatic torsional spring installation equipment | |
| CN108326539B (en) | Screw drill auxiliary dismounting device for petroleum and natural gas exploitation | |
| CN100569626C (en) | Hydraulic pressure turn-over device of large-scale component | |
| CN207139692U (en) | A kind of development machine coal-winning machine pin shaft disassembling tool | |
| CN103447267B (en) | Full-automatic cylinder barrel cleaning machine of oil cylinder | |
| CN111075369A (en) | Return-stroke-free tubular column tripping device and under-pressure operation system | |
| CN102688964B (en) | Rolling mill for screw pump stator or rotors | |
| CN112222193B (en) | Novel rotary feeding device for cold-rolled metal seamless pipes | |
| CN103382809A (en) | Vehicle-mounted electric hydraulic vibratory well drilling machine | |
| CN204355682U (en) | A kind of coil car | |
| CN201082451Y (en) | Pipe end spinning enlarging turnup device | |
| CN214990000U (en) | Novel ball mill equipment transportation mounting tool of structure | |
| CN201922226U (en) | Disassembling device for main shaft of switch machine | |
| CN210564417U (en) | Automatic calandria control system of coiled tubing cylinder | |
| CN104242801B (en) | Distribute up and down and settle the system of multiple solar panels with steel construction framework body | |
| CN105834921A (en) | Pushed oscillation type direct-driven ultrahigh-pressure fluid power system | |
| CN105221699A (en) | Rotating lever hydraulic drive rotates energy-saving power-boost device | |
| CN202415442U (en) | Top driving mechanism for drill rod | |
| CN207606477U (en) | A kind of double dynamical cylinder disassembling machine | |
| CN219198553U (en) | Special oil pump of hydraulic spanner convenient to use | |
| CN115870313B (en) | Recycling method of building pile foundation reinforcement cage | |
| CN2612720Y (en) | Hydraumatic feeding drive gearing and machine for drilling steel rails thereof | |
| CN204565860U (en) | Stainless steel pipe endoporus burnishing device | |
| CN201003593Y (en) | Spline type motor speed pulley |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200428 |