CN110697605A - Brake device of cylinder brake type bailing winch - Google Patents
Brake device of cylinder brake type bailing winch Download PDFInfo
- Publication number
- CN110697605A CN110697605A CN201910898982.3A CN201910898982A CN110697605A CN 110697605 A CN110697605 A CN 110697605A CN 201910898982 A CN201910898982 A CN 201910898982A CN 110697605 A CN110697605 A CN 110697605A
- Authority
- CN
- China
- Prior art keywords
- brake
- cylinder
- bailing
- rod
- winch
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/24—Operating devices
- B66D5/26—Operating devices pneumatic or hydraulic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/06—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect
- B66D5/10—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with radial effect embodying bands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/24—Operating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D2700/00—Capstans, winches or hoists
- B66D2700/03—Mechanisms with latches or braking devices in general for capstans, hoists or similar devices as well as braking devices actuated electrically or by fluid under pressure
- B66D2700/035—Fluid operated braking devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses a cylinder braking type bailing winch braking device which comprises two brake belts arranged in parallel, wherein a plurality of brake pads are arranged on the inner side of each brake belt, one end of each brake belt is a fixed end, and the other end of each brake belt is a movable end; the two movable ends are connected through a brake belt shaft, and two driving devices are connected to two ends of the brake belt shaft. The invention has the beneficial effects that: the air cylinder braking mode is adopted, so that the braking is flexible and rapid, and the labor intensity of workers is greatly reduced; the brake handle is arranged for manual emergency brake, so that the equipment safety is higher; the labor cost of field operation can be reduced, and the drilling cost is saved; the risks of leakage and environmental pollution are reduced, and the energy is saved and the environment is protected; the invention has simple installation and manufacturing process and lower economic cost.
Description
Technical Field
The invention belongs to the technical field of petroleum drilling and production equipment, and particularly relates to a cylinder braking type bailing winch brake device.
Background
In the oil drilling operation, the bailing winch is an important part of a drilling machine, and a bailing steel wire rope wound on a roller of the bailing winch reverses direction through a bailing pulley on a crown block, so that the bailing operation including underground testing, oil testing, auxiliary lifting and the like is realized. The bailing winch is generally driven by an alternating-current variable-frequency motor, the bailing drum is driven after the speed is reduced by a cycloid reduction box and a chain box, the main brake of the bailing winch is motor energy-consumption braking, and the auxiliary brake is a belt brake. The band brake device generally transmits brake torque through a link mechanism, mainly manually provides brake torque through a brake handle at the operation end of the link mechanism, and realizes reinforcement of a certain multiple through the link mechanism, so that a brake band is driven to realize a brake function. With the development of drilling equipment and the improvement of automation and control level, higher requirements on safety, energy conservation, high efficiency, labor intensity reduction and the like are provided for an oil field operation field, the traditional bailing winch brake system needs frequent manual braking by workers, the labor cost and the labor intensity are increased, and the traditional manual brake mode cannot meet the requirements on energy conservation and high efficiency of the oil field.
Disclosure of Invention
The invention provides a cylinder braking type bailing winch brake device, which solves the problem that the existing bailing winch needs to be manually braked.
The technical scheme of the invention is that the brake device of the cylinder brake type bailing winch comprises two brake belts which are arranged in parallel, wherein a plurality of brake pads are arranged on the inner side of each brake belt, one end of each brake belt is a fixed end, and the other end of each brake belt is a movable end; the two movable ends are connected through a brake belt shaft, and two driving devices are connected to two ends of the brake belt shaft.
It is also characterized in that:
each fixed end comprises a fixed lifting lug, a pull rod head, a pin shaft, a short pull rod and a balance plate which are sequentially connected, and the fixed ends of the two brake belts are connected through the long pull rod.
Each movable end comprises a movable end lifting lug, the movable end lifting lug is connected with one end of a driven crank, and the other end of the driven crank is connected with a brake belt shaft.
The brake belt shaft is connected with a left bearing and a right bearing, and the left bearing and the right bearing are respectively connected with a left bearing seat and a right bearing seat.
Each driving device comprises a push rod type spring brake cylinder, a push rod of the push rod type spring brake cylinder is connected with one end of a crank, and the other end of the crank is connected with the brake belt shaft.
The push rod type spring brake cylinder is connected with a first cylinder support and a second cylinder support respectively.
Each brake band is further connected with a brake band spring device, each brake band spring device comprises a brake suspension rod, one end of each brake suspension rod is connected with the corresponding brake band, the other end of each brake suspension rod is provided with a first nut, and each brake suspension rod is sequentially provided with a spherical clamping seat, a spherical gasket, a brake band spring and a retaining ring.
Each brake band is also connected with a plurality of guide wheel devices, each guide wheel device comprises a supporting seat, the supporting seat is connected with a first connecting rod and a second connecting rod which are parallel to each other through a second pin shaft, one end of the first connecting rod is connected with one end of the second connecting rod through a third pin shaft, one end of a pull rod is connected onto the third pin shaft, the other end of the pull rod is connected with an adjusting nut, a pull rod spring is arranged on the pull rod, the other end of the first connecting rod and the other end of the second connecting rod are connected with guide wheels through the first pin shaft, and the guide wheels are in contact; a first shaft sleeve is arranged between one end of the pull rod and one end of the first connecting rod, a second shaft sleeve is arranged between one end of the pull rod and one end of the second connecting rod, and two ends of the second pin shaft are connected with check rings.
One side of the brake band shaft is connected with a brake handle.
The brake handle is connected with a brake handle sleeve.
The invention has the beneficial effects that: the air cylinder braking mode is adopted, so that the braking is flexible and rapid, and the labor intensity of workers is greatly reduced; the brake handle is arranged for manual emergency brake, so that the equipment safety is higher; the labor cost of field operation can be reduced, and the drilling cost is saved; the risks of leakage and environmental pollution are reduced, and the energy is saved and the environment is protected; the invention has simple installation and manufacturing process and lower economic cost.
Drawings
FIG. 1 is a schematic structural view of a brake device of a cylinder braking type bailing winch according to the present invention;
FIG. 2 is a side view of the cylinder braking type bailing winch brake of the present invention;
FIG. 3 is a schematic view of the cylinder connection and fixation of the brake device of the cylinder braking type bailing winch of the present invention;
FIG. 4 is a schematic view showing the connection of the two ends of the braking band of the brake device of the cylinder braking type bailing winch of the present invention;
FIG. 5 is a schematic view of a brake band spring device of the brake device of the cylinder braking type bailing winch of the present invention;
FIG. 6 is a structural view of a guide wheel device of the brake device of the cylinder braking type bailing winch of the present invention;
fig. 7 is a cross-sectional view of a guide wheel device of a cylinder braking type bailing winch brake device of the present invention.
In the figure, 1, a brake handle, 2, a first cylinder support, 3, a brake handle sleeve, 4, a crank, 5, a left bearing seat, 6, a left bearing, 7, a bearing cover, 8, a short pull rod, 9, a balance plate, 10, a long pull rod, 11, a brake band shaft, 12, a pull rod head, 13, a pin shaft, 14, a right bearing, 15, a right bearing seat, 16, a second cylinder support, 17, a fixed lifting lug, 18, a brake band, 19, a brake band spring device, 20, a brake lifting rod, 21, a guide wheel device, 22, a push rod type spring brake cylinder, 23, a movable end lifting lug, 24, a driven crank, 25, a spherical clamping seat, 26, a spherical washer, 27, a brake band spring, 28, a retainer ring, 29, a first nut, 30, a support seat, 31, a second pin shaft, 32, a first connecting rod, 33, a second connecting rod, 34, a third pin shaft, 35, a pull rod, 36, an adjusting nut, 37, a pull rod spring, 38, a first pin shaft, 39. guide wheel, 40, first shaft sleeve, 41, second shaft sleeve, 42 and retaining ring.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
A cylinder braking type bailing winch brake device is shown in figure 1 and comprises two brake belts 18, a brake belt shaft 11 and two push rod type spring braking cylinders 22, wherein one end of each brake belt 18 is a fixed end, and the other end of each brake belt 18 is a movable end;
every stiff end is including connecting gradually fixed lug 17, tie-rod head 12, short pull rod 8, balance plate 9, tie-rod head 12 and short pull rod 8 are through round pin axle 13 connection, the balance plate 9 of two brake areas 18 is respectively through the one end of round pin hub connection long pull rod 10, long pull rod 10 includes the otic placode plug at pull rod and both ends, through threaded connection between the otic placode plug at pull rod and both ends, realize long pull rod 10 and two brake areas 18 vertical verticality through rotatory pull rod, thereby adjust left and right brake area atress equilibrium.
Each movable end comprises a movable end lifting lug 23, and the movable end lifting lug 23 is connected with one end of a driven crank 24; each movable end is connected with a brake belt shaft 11 through the other end of the driven crank 24, the brake belt shaft 11 passes through a left bearing 6 and a right bearing seat 14, the left bearing 6 and the right bearing seat 14 are respectively connected with a left bearing seat 5 and a right bearing seat 15, a seat plate is respectively connected below the left bearing seat 5 and the right bearing seat 15, and the seat plates are welded on the bailing winch base.
Wherein, the left bearing 6 is connected with a bearing cover 7 to seal the left bearing 6.
Each brake band 18 is further connected with a brake band spring device 19, each brake band spring device 19 comprises a brake suspension rod 20, one end of each brake suspension rod 20 is fixed on a winch frame of the bailing winch, the other end of each brake suspension rod is connected with the brake band 18 through a pin shaft, a spherical clamping seat 25, a spherical gasket 26, a brake band spring 27, a check ring 28 and a nut 29 are sequentially arranged on each nut brake suspension rod 20, and the tensioning degree of the spring is adjusted by adjusting the first nut 29, so that the effect of assisting in adjusting the gap between a brake pad and a brake hub is achieved; each brake band 18 is further connected with two guide wheel devices 21, each guide wheel device 21 comprises a support seat 30, the guide wheel device 21 is fixedly installed on the inner wall of a winch frame of the bailing winch through the support seat 30, the support seat 30 is connected with a first connecting rod 32 and a second connecting rod 33 which are parallel to each other through a second pin shaft 31, one end of the first connecting rod 32 is connected with one end of the second connecting rod 33 through a third pin shaft 34, one end of a pull rod 35 is connected onto the third pin shaft 34, the other end of the pull rod 35 is connected with an adjusting nut 36, a pull rod spring 37 is arranged on the pull rod 35, the other end of the first connecting rod 32 and the other end of the second connecting rod 33 are connected with a guide wheel 39 through a first pin shaft 38, the guide wheel 39 tightly props against the brake band 18, a first shaft sleeve 40 is arranged between one end of the pull rod 35 and one end of the first connecting rod 32, a second shaft; the length of the pull rod 35 is adjusted by the guide wheel device 21 through the adjusting nut 36, so that the guide wheels 39 on the first connecting rod 32 and the second connecting rod 33 are driven to be at the positions of the brake band 18, the tensioning state of the guide wheels 39 and the brake band 18 is adjusted, and the purpose of assisting in adjusting the gap between the brake pad and the brake hub is achieved.
The inner side of the arc of the brake band 18 is provided with a plurality of brake pads, and the tightness degree of the pull rod head 12, the adjusting nut connected with the pull rod head and the adjusting pull rod is adjusted, so that the gap between the brake pads arranged on the brake band 18 and the brake hub is adjusted, and the holding angle between the brake band 18 and the brake hub is about 270 degrees.
Two push rod type spring brake cylinders 22 are respectively connected to the first cylinder support 2 and the second cylinder support 16, and the first cylinder support 2 and the second cylinder support 16 are fixed on the bailing winch base through bolts.
The using process of the invention is as follows:
the first cylinder support 2 and the second cylinder support 16 of the cylinder braking type bailing winch brake device are fixed on a bailing winch base through bolts, when a system provides control air to brake, a push rod of a push rod type spring braking cylinder 22 extends out to drive a first crank 4 to rotate along a brake band shaft 11 under the action of thrust, so that corresponding torque is generated on the brake band shaft 11 to drive a driven crank 24 and a live end lifting lug 23 to be lifted, and two brake bands 18 tightly hold a brake hub and are in a tensioning state to achieve the braking action; the brake handle 1 can be manually operated to drive the driven crank 24 and the movable end lifting lug 23 to be pulled up, so that the two brake belts 18 tightly hold the brake hub, and manual emergency braking is realized.
Claims (10)
1. The brake device of the cylinder brake type bailing winch is characterized by comprising two brake belts (18) which are arranged in parallel, wherein a plurality of brake pads are arranged on the inner side of each brake belt (18), one end of each brake belt (18) is a fixed end, and the other end of each brake belt is a movable end; the two movable ends are connected through a brake belt shaft (11), and two driving devices are connected to two ends of the brake belt shaft (11).
2. The brake device of the cylinder braking type bailing winch according to claim 1, wherein each fixed end comprises a fixed lifting lug (17), a pull rod head (12), a pin shaft (13), a short pull rod (8) and a balance plate (9) which are connected in sequence, and the fixed ends of the two brake belts (18) are connected through a long pull rod (10).
3. The brake device of the cylinder braking type bailing winch according to claim 1, wherein each movable end comprises a movable end lifting lug (23), the movable end lifting lug (23) is connected with one end of a driven crank (24), and the other end of the driven crank (24) is connected with the brake belt shaft (11).
4. The brake device of the cylinder brake type bailing winch according to claim 3, characterized in that the brake belt shaft (11) is connected with the left bearing (6) and the right bearing (14), and the left bearing (6) and the right bearing (14) are respectively connected with the left bearing seat (5) and the right bearing seat (15).
5. The cylinder braking type bailing winch brake device according to claim 1, wherein each of the driving devices comprises a push rod type spring braking cylinder (22), a push rod of the push rod type spring braking cylinder (22) is connected with one end of a crank (4), and the other end of the crank (4) is connected with the brake belt shaft (11).
6. The cylinder-braking bailing winch brake device according to claim 5, characterized in that the push rod spring brake cylinder (22) is connected to the first cylinder support (2) and the second cylinder support (16), respectively.
7. The brake device of the cylinder braking type bailing winch according to claim 1, wherein each brake band (18) is further connected with a brake band spring device (19), the brake band spring device (19) comprises a brake suspension rod (20), one end of the brake suspension rod (20) is connected with the brake band (18), the other end of the brake suspension rod (20) is provided with a first nut (29), and the brake suspension rod (20) is sequentially provided with a spherical clamping seat (25), a spherical washer (26), a brake band spring (27) and a retainer ring (28).
8. The brake device of the cylinder braking type bailing winch according to claim 1, wherein each brake band (18) is further connected with a plurality of guide wheel devices (21), each guide wheel device (21) comprises a support base (30), the support base (30) is connected with a first connecting rod (32) and a second connecting rod (33) which are parallel to each other through a second pin shaft (31), one end of the first connecting rod (32) is connected with one end of the second connecting rod (33) through a third pin shaft (34), one end of a pull rod (35) is connected to the third pin shaft (34), the other end of the pull rod (35) is connected with an adjusting nut (36), a pull rod spring (37) is arranged on the pull rod (35), the other end of the first connecting rod (32) and the other end of the second connecting rod (33) are connected with a guide wheel (39) through a first pin shaft (38), and the guide wheel (39) contacts with the brake band (18);
the connecting rod is characterized in that a first shaft sleeve (40) is arranged between one end of the pull rod (35) and one end of the first connecting rod (32), a second shaft sleeve (41) is arranged between one end of the pull rod (35) and one end of the second connecting rod (34), and two ends of the second pin shaft (31) are connected with retaining rings (42).
9. The brake device of the cylinder brake type bailing winch according to claim 1, wherein a brake handle (1) is further connected to one end of the brake band shaft (11).
10. The cylinder braking type braking device of the bailing winch according to claim 9, wherein the brake handle (1) is connected with a brake handle sleeve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910898982.3A CN110697605B (en) | 2019-09-23 | 2019-09-23 | Brake device of cylinder brake type bailing winch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910898982.3A CN110697605B (en) | 2019-09-23 | 2019-09-23 | Brake device of cylinder brake type bailing winch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110697605A true CN110697605A (en) | 2020-01-17 |
| CN110697605B CN110697605B (en) | 2021-09-28 |
Family
ID=69195843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910898982.3A Expired - Fee Related CN110697605B (en) | 2019-09-23 | 2019-09-23 | Brake device of cylinder brake type bailing winch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110697605B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112158673A (en) * | 2020-09-09 | 2021-01-01 | 中国石油天然气集团有限公司 | Cooling drum and cable steel wire constant tension winding device |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58199261A (en) * | 1982-05-12 | 1983-11-19 | Hitachi Ltd | Multi-functional brake equipment |
| US4696377A (en) * | 1985-09-27 | 1987-09-29 | Ltv Energy Products Company | Brake system for drawworks |
| FR2771397A1 (en) * | 1997-11-21 | 1999-05-28 | Jean Marie Fusilier | Winch braking unit with progressive control for a forestry tractor. |
| CN201116269Y (en) * | 2007-10-19 | 2008-09-17 | 中油特种车辆有限公司 | Reel cart supercharge loading automatic safety device |
| CN201273362Y (en) * | 2008-10-10 | 2009-07-15 | 盘锦辽河油田金宇集团有限公司 | Portable device used for replacing belt of beam pumping unit |
| CN201916393U (en) * | 2011-01-08 | 2011-08-03 | 湖北四钻石油设备股份有限公司 | Slide type mechanical anti-interference brake device |
| CN102659052A (en) * | 2012-04-28 | 2012-09-12 | 江苏新迈机械有限公司 | Brake band separating and rolling mechanism |
| CN104196921A (en) * | 2014-08-25 | 2014-12-10 | 宝鸡石油机械有限责任公司 | Belt type braking device for anchor machine |
| CN105502197A (en) * | 2016-01-19 | 2016-04-20 | 江苏省无锡探矿机械总厂有限公司 | Manual internal contracting brake device |
| CN205527509U (en) * | 2016-03-18 | 2016-08-31 | 沈阳泰博达石油测控仪器有限公司 | Brake actuating mechanism |
| CN106050985A (en) * | 2016-05-31 | 2016-10-26 | 昆山邦泰汽车零部件制造有限公司 | Safety brake mechanism for downhole rescue |
| CN108033377A (en) * | 2018-01-05 | 2018-05-15 | 中国水产科学研究院渔业机械仪器研究所 | A kind of hydraulic wireline winch brake apparatus |
| CN209242565U (en) * | 2018-10-24 | 2019-08-13 | 陕西渤海石油机械有限公司 | Convenient for the oil-extraction vehicle winch gear that brake system is adjusted |
-
2019
- 2019-09-23 CN CN201910898982.3A patent/CN110697605B/en not_active Expired - Fee Related
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58199261A (en) * | 1982-05-12 | 1983-11-19 | Hitachi Ltd | Multi-functional brake equipment |
| US4696377A (en) * | 1985-09-27 | 1987-09-29 | Ltv Energy Products Company | Brake system for drawworks |
| FR2771397A1 (en) * | 1997-11-21 | 1999-05-28 | Jean Marie Fusilier | Winch braking unit with progressive control for a forestry tractor. |
| CN201116269Y (en) * | 2007-10-19 | 2008-09-17 | 中油特种车辆有限公司 | Reel cart supercharge loading automatic safety device |
| CN201273362Y (en) * | 2008-10-10 | 2009-07-15 | 盘锦辽河油田金宇集团有限公司 | Portable device used for replacing belt of beam pumping unit |
| CN201916393U (en) * | 2011-01-08 | 2011-08-03 | 湖北四钻石油设备股份有限公司 | Slide type mechanical anti-interference brake device |
| CN102659052A (en) * | 2012-04-28 | 2012-09-12 | 江苏新迈机械有限公司 | Brake band separating and rolling mechanism |
| CN104196921A (en) * | 2014-08-25 | 2014-12-10 | 宝鸡石油机械有限责任公司 | Belt type braking device for anchor machine |
| CN105502197A (en) * | 2016-01-19 | 2016-04-20 | 江苏省无锡探矿机械总厂有限公司 | Manual internal contracting brake device |
| CN205527509U (en) * | 2016-03-18 | 2016-08-31 | 沈阳泰博达石油测控仪器有限公司 | Brake actuating mechanism |
| CN106050985A (en) * | 2016-05-31 | 2016-10-26 | 昆山邦泰汽车零部件制造有限公司 | Safety brake mechanism for downhole rescue |
| CN108033377A (en) * | 2018-01-05 | 2018-05-15 | 中国水产科学研究院渔业机械仪器研究所 | A kind of hydraulic wireline winch brake apparatus |
| CN209242565U (en) * | 2018-10-24 | 2019-08-13 | 陕西渤海石油机械有限公司 | Convenient for the oil-extraction vehicle winch gear that brake system is adjusted |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112158673A (en) * | 2020-09-09 | 2021-01-01 | 中国石油天然气集团有限公司 | Cooling drum and cable steel wire constant tension winding device |
| CN112158673B (en) * | 2020-09-09 | 2022-03-18 | 中国石油天然气集团有限公司 | Cooling drum and cable steel wire constant tension winding device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110697605B (en) | 2021-09-28 |
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| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20200928 Address after: Baoji City, Shaanxi Province, 721002 Dongfeng Road, Jintai District No. 2 Applicant after: BAOJI OILFIELD MACHINERY Co.,Ltd. Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC national oil and gas drilling equipment Engineering Technology Research Center Co.,Ltd. Address before: Baoji City, Shaanxi Province, 721002 Dongfeng Road, Jintai District No. 2 Applicant before: Baoji Oilfield Machinery Co.,Ltd. |
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Granted publication date: 20210928 |