CN111001567A - Screen fixing device - Google Patents

Screen fixing device Download PDF

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Publication number
CN111001567A
CN111001567A CN201911409188.4A CN201911409188A CN111001567A CN 111001567 A CN111001567 A CN 111001567A CN 201911409188 A CN201911409188 A CN 201911409188A CN 111001567 A CN111001567 A CN 111001567A
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CN
China
Prior art keywords
screen
hole
eccentric sleeve
fixing
eccentric
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
Application number
CN201911409188.4A
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Chinese (zh)
Inventor
牟长清
张�杰
米永强
孔利剑
王宝利
刘振华
陈伟
孙绪发
周秀丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HG (HEBEI) DRILLING EQUIPMENT Co.,Ltd.
China National Petroleum Corp
CNPC Bohai Equipment Manufacturing Co Ltd
Original Assignee
Hg Hebei Drilling Equipment Co ltd
China National Petroleum Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hg Hebei Drilling Equipment Co ltd, China National Petroleum Corp filed Critical Hg Hebei Drilling Equipment Co ltd
Priority to CN201911409188.4A priority Critical patent/CN111001567A/en
Publication of CN111001567A publication Critical patent/CN111001567A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/06—Arrangements for treating drilling fluids outside the borehole
    • E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/02—Fastening means for fastening screens to their frames which do not stretch or sag the screening surfaces

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  • 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)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

The invention provides a screen fixing device, which belongs to the technical field of petroleum drilling devices and comprises a fixed seat, an eccentric sleeve, a guide piece and a pressing and fixing piece, wherein the fixed seat is connected with a screen box and is provided with a through hole; the eccentric sleeve is sleeved in the through hole, the outer wall of the eccentric sleeve is provided with a spiral groove, and the eccentric sleeve is provided with an eccentric hole; the guide piece is arranged on the fixed seat and extends into the spiral groove; the pressing and fixing piece is rotatably connected with the eccentric hole and moves along with the eccentric sleeve, and the pressing and fixing piece reaches a pressing position by means of the rotation of the eccentric sleeve and fixes and presses the screen. The screen fixing device provided by the invention is simple in structure and convenient for screen disassembly and assembly.

Description

Screen fixing device
Technical Field
The invention belongs to the technical field of petroleum drilling devices, and particularly relates to a screen fixing device.
Background
The well drilling vibrating screen is the first stage equipment in the solid control equipment, and the use effect of the vibrating screen influences the work efficiency of the subsequent stages of solid control equipment and directly influences the underground working condition of the well drilling engineering. The speed of installation and the firmness of compression of the screen cloth can affect the operating efficiency of the shaker. When the existing screen is installed, the screen is placed in a screen box, and an operator hammers a wedge block from the inner side of the screen box to tightly press the screen; when the screen cloth is disassembled, an operator pries the wedge block from the inner side of the screen box so as to disassemble the screen cloth. The existing screen fixing structure causes the operation difficulty of operators and the low working efficiency.
Disclosure of Invention
The invention aims to provide a screen fixing device, and aims to solve the problems of inconvenience in installation and low efficiency of a press-fixing structure of an existing screen.
In order to achieve the purpose, the invention adopts the technical scheme that: the screen fixing device comprises a fixed seat, an eccentric sleeve, a guide piece and a pressing and fixing piece, wherein the fixed seat is connected with a screen box, and a through hole is formed in the fixed seat; the eccentric sleeve is sleeved in the through hole, the outer wall of the eccentric sleeve is provided with a spiral groove, and the eccentric sleeve is provided with an eccentric hole; the guide piece is arranged on the fixed seat and extends into the spiral groove; the pressing and fixing piece is rotatably connected with the eccentric hole and moves along with the eccentric sleeve, and the pressing and fixing piece reaches a pressing position by means of the rotation of the eccentric sleeve and fixes and presses the screen.
As another embodiment of the application, the press-fixing piece is used for fixing and pressing the screen mesh in a self-locking mode through the eccentric sleeve.
As another embodiment of this application, the pressure firmware comprises the connecting axle and the clamp plate of locating connecting axle one end, and the pressure firmware passes through the connecting axle to be connected with eccentric orfice rotation, and the clamp plate is used for pressing solid screen cloth.
As another embodiment of the application, the eccentric hole is a step hole, the connecting shaft is sleeved in a small hole of the step hole, the other end of the connecting shaft is provided with a cover plate, and the connecting shaft is limited in the small hole of the step hole through the cover plate and the pressing plate.
As another embodiment of the application, the press-fixing piece fixes and presses the screen by self-locking between the spiral groove and the guide piece.
As another embodiment of the present application, the guide member is a guide pin, and the guide pin is provided with a threaded section and a pin shaft section.
As another embodiment of this application, be equipped with the screw hole on the fixing base, the screw thread section and the screw hole threaded connection of uide pin, the round pin axle section of uide pin stretches into the helicla flute.
As another embodiment of this application, the fixing base cover is established in the mounting hole of sieve case to link to each other with the sieve case.
As another embodiment of this application, screen cloth fixing device still includes the spiral cover, and the spiral cover links to each other with eccentric cover from the sieve case outside, and the spiral cover is equipped with the drive seat, and the drive seat is hexagonal prism, and the drive seat is used for the drive the spiral cover rotates.
As another embodiment of this application, can break up on the spiral cover and be provided with the pressure oiling cup, be equipped with the oil circuit on the eccentric cover, the one end of oil circuit leads to the pressure firmware and the contact department of eccentric cover, and the other end leads to the pressure solid oil cup.
The screen fixing device provided by the invention has the beneficial effects that: compared with the prior art, the screen fixing device has the advantages that the fixing seat is connected with the screen box, the through hole is formed in the fixing seat, the eccentric sleeve is sleeved in the through hole, the spiral groove is formed in the outer wall of the eccentric sleeve, the guide piece is arranged on the fixing seat and extends into the spiral groove, the rotating eccentric sleeve is sleeved under the guide of the guide piece and the spiral groove, and the eccentric sleeve moves along the axis direction of the through hole when rotating. The eccentric hole is formed in the eccentric sleeve, the pressing and fixing piece is connected with the eccentric hole in a rotating mode and moves along with the eccentric sleeve, and due to the eccentric hole, when the eccentric sleeve rotates, the pressing and fixing piece can ascend or descend along with the eccentric sleeve when moving along the axis direction of the through hole. And because the eccentric hole is rotationally connected with the pressing piece, the pressing piece can freely rotate in the eccentric hole, and after the pressing piece is contacted with the screen, the bottom surface of the pressing piece is kept horizontal under the action of upward elastic force on two sides of the screen, so that the pressing piece is more fully contacted with the screen. When the screen is installed, the screen is placed in the screen box, and when the eccentric sleeve is rotated to enable the press-fixing piece to move to the pressing position, the press-fixing piece is fixed and the screen is pressed and fixed. The eccentric sleeve is rotated to enable the pressing piece to be in contact with or separated from the screen, and the pressing piece can move along the axis direction of the through hole while rising or falling, so that space is reserved for placing or taking out the screen, the operation is more convenient, and the efficiency is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is an exploded view of a screen holding apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a screen fixing device according to an embodiment of the present invention;
FIG. 3 is a sectional view taken along line A-A of FIG. 2;
FIG. 4 is a cross-sectional structural view of a screen retainer in use according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a self-locking force analysis of the fastener according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an embodiment of the present invention in which a helical groove is assumed to be fixed and a guide member is subjected to an applied force;
FIG. 7 is a left side view of FIG. 6;
fig. 8 is a force analysis diagram of the guide.
In the figure: 1. pressing a plate; 2. an eccentric sleeve; 3. a helical groove; 5. a fixed seat; 6. a guide member; 7. a threaded hole; 8. a cover plate; 9. a connecting bolt; 10. screwing a cover; 11. pressing and filling the oil cup; 12. fixing the bolt; 13. a driving seat; 14. a screen box; 15. screening a screen; 16. an oil path; 17. and (7) connecting the shafts.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4, a screen 15 fixing device according to the present invention will be described. The screen 15 fixing device comprises a fixing seat 5, an eccentric sleeve 2, a guide piece 6 and a pressing and fixing piece, wherein the fixing seat 5 is connected with a screen box 14, and a through hole is formed in the fixing seat 5; the eccentric sleeve 2 is sleeved in the through hole, the outer wall of the eccentric sleeve 2 is provided with a spiral groove 3, and the eccentric sleeve 2 is provided with an eccentric hole; the guide piece 6 is arranged on the fixed seat 5, and the guide piece 6 extends into the spiral groove 3; the press-fixing piece is rotatably connected with the eccentric hole and moves along with the eccentric sleeve 2, and the press-fixing piece reaches a pressing position by means of the rotation of the eccentric sleeve 2 and fixes the press-fixing screen 15.
Compared with the prior art, the screen 15 fixing device provided by the invention has the advantages that the fixing seat 5 is connected with the screen box 14, the through hole is formed in the fixing seat 5, the eccentric sleeve 2 is sleeved in the through hole, the spiral groove 3 is formed in the outer wall of the eccentric sleeve 2, the guide piece 6 is arranged on the fixing seat 5, the guide piece 6 extends into the spiral groove 3, the eccentric sleeve 2 is rotated under the guide of the guide piece 6 and the spiral groove 3, and the eccentric sleeve 2 moves along the axial direction of the through hole when rotating. The eccentric hole has been seted up on eccentric sleeve 2, and the pressure firmware rotates with the eccentric hole to be connected and moves along with eccentric sleeve 2, because for the eccentric hole, when eccentric sleeve 2 rotated, the pressure firmware can rise or descend when moving along the axis direction of through-hole along eccentric sleeve 2. And because the eccentric hole is connected with the press fastener in a rotating manner, the press fastener can freely rotate in the eccentric hole, and after the press fastener is contacted with the screen 15, the bottom surface of the press fastener is kept horizontal under the action of upward elastic force at two sides of the screen 15, so that the press fastener is more fully contacted with the screen 15. When the screen 15 is installed, the screen 15 is placed in the screen box 14, and when the press member is moved to the pressing position by rotating the eccentric sleeve 2, the press member is fixed and the screen 15 is pressed. According to the invention, the press-fixing piece is contacted with or separated from the screen 15 by rotating the eccentric sleeve 2, and the press-fixing piece can move along the axis direction of the through hole while ascending or descending, so that a space is provided for placing or taking out the screen 15, the operation is more convenient, and the efficiency is high.
In this embodiment, after the pressing member reaches the pressing position, the eccentric sleeve 2 can be connected to the fixing base 5. For example, at least two fixing holes are formed in the spiral groove 3 of the eccentric sleeve 2, wherein one fixing hole corresponds to the position of the press fastener when the screen 15 is loosened, and the other fixing holes correspond to the positions of the press fastener when the screen 15 is pressed and fixed. When the eccentric sleeve 2 rotates, the guide piece 6 extends into the spiral groove 3 but does not extend into the fixing hole, and when the press-fixing piece is required to press and fix the screen 15, the guide piece 6 extends into the fixing hole for fixing. Other connection fixing modes can be adopted.
Referring to fig. 5, as a specific embodiment of the fixing device for the screen 15 provided by the present invention, the pressing member is self-locked and fixed to press and fix the screen 15 by the eccentric sleeve 2.
In this embodiment, after the press-fixing member reaches the pressing position, the press-fixing member is fixed without any connecting structure, and the press-fixing member is directly fixed by self-locking under stress, so as to press-fix the screen 15.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 to 4, the pressing member is composed of a connecting shaft 17 and a pressing plate 1 disposed at one end of the connecting shaft 17, the pressing member is rotatably connected with the eccentric hole through the connecting shaft 17, and the pressing plate 1 is used for pressing and fixing the screen 15.
In this embodiment, as shown in fig. 5, P in fig. 5 is a pressing point at which the connecting shaft 17 presses the pressing plate 1, O is a rotation center of the eccentric sleeve 2, C is a center of the eccentric hole, and an eccentric distance between O and C is e. When the pressing plate 1 presses the screen 15, the screen 15 gives a force R to the eccentric sleeve 2 through the pressing plate 1 and the connecting shaft 17. For the guide 6 to ensure self-locking, the counterforce R should be tangent or tangent to the friction circle, which is the critical condition. Through stress analysis and calculation, the following formula is obtained:
Figure BDA0002349510590000051
where Ψ is the friction angle, r is the eccentric bore radius, rfIs the friction circle radius.
rf＝fv*r
Wherein fv is the friction coefficient equivalent to the shaft diameter, and r is the radius of the eccentric hole.
In the embodiment, the eccentricity e between the rotation center O of the eccentric sleeve 2 and the center C of the eccentric hole is 12mm, psi is 5.7 degrees, the radius of the eccentric hole is 15mm, the equivalent friction coefficient of the fv shaft diameter is 0.1, and a is not more than 20 degrees. Even if the connecting shaft 17 is not positioned at the lowest rotating point of the eccentric sleeve 2, self-locking can be realized as long as the angle a is less than 20 degrees. When the screen 15 fixing device is used in practice, the angle a can be controlled within 5 degrees, so that the screen 15 fixing device can be reliably self-locked.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 to 4, the eccentric hole is a stepped hole, the connecting shaft 17 is sleeved in a small hole of the stepped hole, the other end of the connecting shaft 17 is provided with a cover plate 8, and the connecting shaft 17 is limited in the small hole of the stepped hole by the cover plate 8 and the pressing plate 1.
In this embodiment, the cover plate 8 is connected to the connecting shaft 17 by the connecting bolt 9.
As an embodiment of the present invention, referring to fig. 1 to 4 and fig. 6 to 8, the press-fixing member fixes and presses the screen 15 by self-locking between the spiral groove 3 and the guide member 6. When the guide part 6 rotates to the pressing position, the pressing and fixing part can be fixed through self-locking of stress between the spiral groove 3 and the guide part 6.
In this embodiment, when the press-fixing member presses the screen 15, the eccentric sleeve 2 is subject to the force of the screen 15, and the eccentric sleeve 2 is driven to rotate, so that the press-fixing member is loosened. Since the rotation of the spiral groove 3 is the result of the interaction of the external force, the rotating groove and the guide member 6, the guide member 6 moves along the spiral groove 3 assuming that the eccentric sleeve 2 is fixed, and the self-locking condition of the guide member 6 is the self-locking condition for fixing the fastener.
Assuming that the eccentric sleeve 2 is fixed, the guide 6 is subjected to a radial force F and an axial force Q as shown in fig. 6 to 7. The helical groove 3 gives a guide 6 to connectContact pressure FNAnd frictional force Ff，FNAnd FfForm a resultant force FrThe critical condition of self-locking of the guide piece 6 obtained through stress analysis is as follows:
F＝Qtg(λ-ρ)
thus, when λ < ρ, F is negative, i.e., self-locking. In this embodiment, the coefficient of friction is 0.2, so that self-locking is possible when ρ <11 °. The self-locking of the fixing piece and the self-locking combination design and combined use between the spiral groove 3 and the guide piece 6 can increase the reliability of the self-locking.
Referring to fig. 1 to 4, as an embodiment of the present invention, the guiding element 6 is a guiding pin, and the guiding pin is provided with a threaded section and a pin shaft section.
As a specific implementation manner of the embodiment of the present invention, please refer to fig. 1 to 4, a threaded hole 7 is formed on the fixing seat 5, a threaded section of the guide pin is in threaded connection with the threaded hole 7, and a pin shaft section of the guide pin extends into the spiral groove 3. The guide pin is connected with the fixed seat 5 through threads, so that the guide pin is convenient to disassemble and assemble.
Referring to fig. 1 to 4, as a specific implementation manner of the embodiment of the present invention, the fixing base 5 is sleeved in the mounting hole of the screen box 14 and is connected to the screen box 14. Therefore, an operator can operate from the outside of the screen box 14, and the operation space is large, and the operation is more convenient.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 1 to 4, the screen 15 fixing device further includes a screw cap 10, the screw cap 10 is connected to the eccentric sleeve 2 from the outer side of the screen box 14, the screw cap 10 is provided with a driving seat 13, the driving seat 13 is a hexagonal prism, and the driving seat 13 is used for driving the screw cap 10 to rotate. The hexagonal prism driving seat 13 enables an operator to rotate the shaft cap 10 through a wrench and other existing tools, and the operation is more convenient.
In this embodiment, the screw cap 10 is connected to the eccentric sleeve 2 by a fixing bolt 12.
Referring to fig. 1 to 4, as a specific implementation manner of the embodiment of the present invention, a press filling oil cup 11 is detachably and dispersedly disposed on the screw cap 10, an oil path 16 is disposed on the eccentric sleeve 2, one end of the oil path 16 leads to the press fixing member, and the other end leads to the press fixing oil cup.
In this embodiment, one end of the oil path 16 leads to the contact position of the connecting shaft 17 and the eccentric sleeve 2, so that the connecting shaft 17 can rotate freely in the eccentric hole, and the bottom surface of the pressing piece can be kept horizontal constantly.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. Screen cloth fixing device, its characterized in that includes:
the fixing seat is connected with the screen box and is provided with a through hole;
the eccentric sleeve is sleeved in the through hole, a spiral groove is formed in the outer wall of the eccentric sleeve, and an eccentric hole is formed in the eccentric sleeve;
the guide piece is arranged on the fixed seat and extends into the spiral groove; and
and the pressing and fixing piece is rotationally connected with the eccentric hole and moves along with the eccentric sleeve, and the pressing and fixing piece reaches a pressing position by means of the rotation of the eccentric sleeve and fixes and presses and fixes the screen.
2. The screen panel securing apparatus of claim 1, wherein the hold down member is self-locking secured and hold down the screen panel by the eccentric sleeve.
3. The screen fixing device as claimed in claim 2, wherein the press-fixing member is composed of a connecting shaft and a press plate provided at one end of the connecting shaft, the press-fixing member is rotatably connected to the eccentric hole through the connecting shaft, and the press plate is used for press-fixing the screen.
4. The screen cloth fixing device as claimed in claim 3, wherein the eccentric hole is a stepped hole, the connecting shaft is sleeved in the small hole of the stepped hole, the other end of the connecting shaft is provided with a cover plate, and the connecting shaft is limited in the small hole of the stepped hole by the cover plate and the pressing plate.
5. The screen panel securing apparatus of claim 1, wherein the hold down member secures and holds down the screen panel by self-locking between the helical groove and the guide member.
6. The screen fixing apparatus of claim 5, wherein the guide member is a guide pin having a threaded section and a pin shaft section.
7. The screen fixing device of claim 6, wherein the fixing seat is provided with a threaded hole, the threaded section of the guide pin is in threaded connection with the threaded hole, and the pin shaft section of the guide pin extends into the threaded groove.
8. The screen panel securing apparatus of claim 1, wherein the anchor block is received in the mounting hole of the screen box and is connected to the screen box.
9. The screen mesh fixing device as claimed in claim 1, further comprising a screw cap connected to the eccentric sleeve from the outside of the screen box, wherein the screw cap is provided with a driving seat, the driving seat is a hexagonal prism, and the driving seat is used for driving the screw cap to rotate.
10. The screen panel attachment apparatus of claim 9, wherein said spin cap is removably provided with a pressurized grease cup, said eccentric sleeve is provided with a grease passage, one end of said grease passage leads to a contact point of the fastener and the eccentric sleeve, and the other end leads to said pressurized grease cup.
CN201911409188.4A 2019-12-31 2019-12-31 Screen fixing device Pending CN111001567A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911409188.4A CN111001567A (en) 2019-12-31 2019-12-31 Screen fixing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911409188.4A CN111001567A (en) 2019-12-31 2019-12-31 Screen fixing device

Publications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112206571A (en) * 2020-12-03 2021-01-12 东营市永吉石油机械有限责任公司 Vibrating screen for drilling mud treatment
CN116586292A (en) * 2023-05-29 2023-08-15 河北冠能石油机械制造有限公司 Vibrating screen material device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112206571A (en) * 2020-12-03 2021-01-12 东营市永吉石油机械有限责任公司 Vibrating screen for drilling mud treatment
CN116586292A (en) * 2023-05-29 2023-08-15 河北冠能石油机械制造有限公司 Vibrating screen material device
CN116586292B (en) * 2023-05-29 2023-11-17 河北冠能石油机械制造有限公司 Vibrating screen material device

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Effective date of registration: 20201106

Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No.

Applicant after: CHINA NATIONAL PETROLEUM Corp.

Applicant after: CNPC Bohai Petroleum Equipment Manufacturing Co.,Ltd.

Applicant after: HG (HEBEI) DRILLING EQUIPMENT Co.,Ltd.

Address before: China Petroleum Tianjin building, No.83, Second Street, economic and Technological Development Zone, Binhai New Area, Tianjin

Applicant before: CNPC Bohai Petroleum Equipment Manufacturing Co.,Ltd.

Applicant before: HG (HEBEI) DRILLING EQUIPMENT Co.,Ltd.