CN208763594U - A kind of coal mine drilling high pressure water pigtail - Google Patents
A kind of coal mine drilling high pressure water pigtail Download PDFInfo
- Publication number
- CN208763594U CN208763594U CN201821527263.8U CN201821527263U CN208763594U CN 208763594 U CN208763594 U CN 208763594U CN 201821527263 U CN201821527263 U CN 201821527263U CN 208763594 U CN208763594 U CN 208763594U
- Authority
- CN
- China
- Prior art keywords
- inner shaft
- ectosome
- rotation
- high pressure
- bearing
- 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.)
- Expired - Fee Related
Links
Abstract
A kind of coal mine drilling high pressure water pigtail, including inner shaft and rotary body, rotary body includes protection end cap and rotation ectosome, the right end of inner shaft horizontal through protection end cap and be deep into rotation ectosome inside, inner shaft is rotatablely connected with protection end cap and rotation ectosome, the left end of protection end cap is set in inner shaft, it protects and is provided with the first seal groove between the left end and inner shaft of end cap and is equipped with sealing ring, bearing is equipped in the two sides of annular protrusion, high pressure combination sealing is equipped between bearing and inner shaft, the right end of protection end cap is set on the left end of rotation ectosome, inner shaft is internally provided with inner shaft drainage channel, rotation ectosome is internally provided with ectosome drainage channel, the right end of inner shaft drainage channel is connected to the left end of ectosome drainage channel；The utility model can adapt to drilling rod rotation in a word, and the biggish pressure medium being able to bear has the advantages that easy to connect, wear-resistant and good seal performance.
Description
Technical field
The utility model relates to the anti-reflection field in coal seam more particularly to a kind of coal mine drilling high pressure water pigtails.
Background technique
Increase with the development and national economy of coal in China industry to coal demand, coal production are continuously improved,
The innovation of technology becomes an important factor for restricting coal mining, and the especially development of methane drawing technology is even more along system
About the raising of coal production.The currently used method that can improve gas drainage efficiency is high-pressure hydraulic punching techniques and high pressure
Hydraulic turbulence first drills to coal seam with drilling machine, the coal seam after drilling is then gone out to big cave with high pressure water
Hole facilitates the discharge of gas；But with the increase of the mining depth of coal geology in recent years, corresponding geological conditions is increasingly
" three is soft " characteristic of difference, coal seam is more and more obvious, and the difficulty and efficiency of gas drainage are consequently increased, and is rushed therewith to high-pressure hydraulic
Higher requirements are also raised for the development of hole technology and high-pressure hydraulic slotting technique.In order to make punching effect reach target,
Drilling rod require still be able to after high-pressure water jet keep rotation, and the high pressure water pigtail that high pressure water is provided be also required to bear it is sufficiently large
The water of flow pipe could be transported at drilling rod by pressure medium, in recent years to high pressure water pigtail bear pressure medium requirement from
0 ~ 3Mpa before is increased to 10 ~ 50Mpa, and the special high pressure water pigtail in part needs to bear the pressure of 80 ~ 100Mpa, but at present
High pressure water pigtail can only bear the pressure medium within 3MPa, be insufficient to allow hydraulic flushing in hole to obtain expected effect, while existing
High pressure water pigtail can only keep good sealing performance when drilling rod is static, and when drilling rod rotation, the sealing performance of high pressure water pigtail can be anxious
Acute decline, influences the conveying of high pressure water, in addition the poor durability of existing high pressure water pigtail, during following drilling rod to rotate
Abrasion damage is big, and the frequency needed replacing is very high, and there are many accessory structures for the connection of existing high pressure water pigtail, and structure is complicated, meeting
Increase the load of drilling rod rotation, reduces the efficiency of high pressure water conveying.
Utility model content
The utility model provides a kind of coal mine drilling high pressure water pigtail, can be while keeping drilling rod rotation, by high pressure
Water is transported to from drilling rod from flow pipe, and solves the medium low bearing capacity that existing high pressure water pigtail has simultaneously, and parts depreciation is big, close
The bad technical problem of envelope property.
In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution: a kind of coal mine drilling high pressure water
Pigtail is connect with high-pressure rubber pipe and high pressure sealing drilling rod respectively, including inner shaft and rotary body, inner shaft are horizontally disposed in left-right direction,
The left end of inner shaft is connect with high-pressure rubber pipe, and the right end of rotary body is connect with high pressure sealing drilling rod, rotary body include protection end cap and
Rotate ectosome, the right end of inner shaft is horizontal through protection end cap and is deep into the inside of rotation ectosome, inner shaft with protection end cap and
Rotate ectosome rotation connection, protection end cover the first step hole for being from left to right followed successively by internal diameter equipped with stepped hole and becoming larger,
Second step hole, third stepped hole；The left part for rotating ectosome is equipped with stepped hole, is from left to right followed successively by internal diameter gradually smaller the
Four stepped holes, the 5th stepped hole, the 6th stepped hole；Annular protrusion is provided in inner shaft, annular protrusion is located in the 4th stepped hole,
First step hole covers in inner shaft, and first step hole is equipped with the first seal groove and is equipped with lip-type packing, and third stepped hole is
Internal thread hole, corresponding to be equipped with external screw thread in rotation ectosome left end, protection end cap, which is connected through a screw thread, to be covered in the left end of rotation ectosome；
It is equipped with bearing in the two sides of annular protrusion, bearing includes being located at the left bearing on the left of annular protrusion and being located on the right side of annular protrusion
Right bearing, the inner ring of two bearings acts against on the corresponding left and right side of annular protrusion, bearing be located at the 4th stepped hole and
Between inner shaft, the right side in second step hole is acted against to the right on the left of the outer ring by left bearing, the 6th stepped hole and inner shaft it
Between be equipped with high pressure combination sealing, the left side of the 5th stepped hole is acted against to the left on the right side of the outer ring of right bearing；The inside of inner shaft
It is provided with inner shaft drainage channel, rotate ectosome is internally provided with ectosome drainage channel, the right end and ectosome of inner shaft drainage channel
The left end of drainage channel is connected to.
Further, inner shaft is directly connected to by inserting pin end fastly with high-pressure rubber pipe, and slotting pin end inserts public affairs using K-type fastly fastly
Connector or D type insert pin end fastly.
Further, the part of first step Kong Shangyu inner shaft contact is arranged in the first seal groove, and the first seal groove is surround
Inner shaft setting, the opening of the first seal groove is towards the direction of inner shaft.
Further, it rotates and is provided with horizontal limit sleeve to the left in the middle part of the left end of ectosome, the left end of limit sleeve is resisted against
On the right side in second step hole, the outer ring of limit sleeve is provided with external screw thread, the outer ring of limit sleeve and the inner ring of third stepped hole
It is threadedly coupled, the inner ring of limit sleeve and the outer ring of bearing connect.
Further, the second seal groove offered on ectosome inner sidewall around inner shaft setting is rotated, the second seal groove is
The inside of the second seal groove is arranged in stepped seal groove, high pressure combination sealing.
Further, bearing uses double row angular contact bearing.
Further, the center line of inner shaft drainage channel and ectosome drainage channel is overlapped and internal diameter is identical, and inner shaft draining is logical
The right end in road and ectosome drainage channel left end are communicated with buffer channel, and the internal diameter of buffer channel and the outer diameter of inner shaft are identical, inner shaft
Right side not with rotation ectosome contact.
Further, the rotation direction of thread on the internal thread hole of third stepped hole and on the external screw thread of rotation ectosome left end
It is opposite with the rotation rotation direction of ectosome.
Compared with the existing technology, the utility model has the following beneficial effects: this is practical opposing stationary using inner shaft, ectosome is rotated
The seperated mode of bilayer of relative rotation, and inner shaft and rotation ectosome are connected by double row angular contact bearing, can make inner shaft and
Opposite play will not be occurred in the axial direction of inner shaft while ectosome relatively rotates by rotating, can be direct using fast slotting pin end
Easily connection inner shaft and high-pressure rubber pipe, can be in the process of conveying high-pressure water using inner shaft drainage channel and ectosome drainage channel
The middle flow direction for changing high pressure water prevents extraneous impurity from entering from the gap of inner shaft and protection end cap using lip-type packing
To the position of bearing and the inside of inner shaft drainage channel, to the inside of pollution high voltage water pigtail and be polluted to bearing, use
Reverse thread connection protection end cap and rotation ectosome can guarantee that end cap and outer rotation ectosome is protected to rotate synchronously, guarantee simultaneously
It is loose right that reverse thread will not occur while following protection end cap and rotation ectosome rotation, using two double row angular contact bearings
Can be further ensured that protection end cap and rotate ectosome rotation stability, prevented using high pressure combination sealing high pressure water from turn
The gap internal leakage of dynamic ectosome and inner shaft, using inner shaft drainage channel with ectosome drainage channel the horizontally disposed and identical convenience of diameter
High pressure water is prevented in the conveying of the inside of high pressure water pigtail using first step hole, second step hole, annular protrusion and rotation ectosome
The movement of lip-type packing and double row angular contact bearing horizontal direction anyway, is made to rotate ectosome using limit sleeve and protects end cap
It connects even closer, using the second seal groove while preventing high pressure combination sealing from moving horizontally, also makes high pressure combination sealing
Sealing effect it is more preferable, avoid the right side of inner shaft from rubbing with rotation ectosome using buffer channel, the utility model in a word
It can adapt to drilling rod rotation, the biggish pressure medium being able to bear has easy to connect, wear-resistant and good seal performance excellent
Point.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the connection schematic diagram for protecting end cap and limit sleeve；
Fig. 3 is the connection schematic diagram of high pressure combination sealing and the second seal groove.
In figure: 1, inner shaft 2, rotary body 3, protection end cap 4, rotation ectosome 5, lip-type packing 6, bearing
7, annular protrusion 8, high pressure combination sealing 9, inner shaft drainage channel 10, ectosome drainage channel 11, the first seal groove
12, limit sleeve 13, the second seal groove 14, buffer channel 31, first step hole 32, second step hole 33, third
Stepped hole 41, the 4th stepped hole 42, the 5th stepped hole 43, the 6th stepped hole 61, left bearing 62, right bearing.
Specific embodiment
Embodiment: as shown in Figure 1 to Figure 3, a kind of coal mine drilling high pressure water pigtail, including inner shaft 1 and rotary body 2, inner shaft 1
It is horizontally disposed in left-right direction, the left end of inner shaft 1 is connect with high-pressure rubber pipe, inner shaft 1 and high-pressure rubber pipe connection type in this example
K-type can be selected to insert pin end or D type fastly as needed, and slotting pin end is connect with high-pressure rubber pipe fastly, the right end and high pressure of rotary body 2
The tail portion of sealing drilling rod connects, and inner shaft 1 can rotate synchronously under the drive of high pressure sealing drilling rod, in actual application, high pressure
The connection of sebific duct and high pressure sealing drilling rod and high pressure water pigtail is the prior art, does not make excessive elaboration herein.Rotary body 2 wraps
Protection end cap 3 and rotation ectosome 4 are included, the left side of the protection setting rotation ectosome 4 of end cap 3, the right end of inner shaft 1 is horizontal through protection end
Lid 3 and the inside for being deep into rotation ectosome 4, inner shaft 1 are rotatablely connected with protection end cap 3 and rotation ectosome 4.
It protects end cap 3 to be equipped with stepped hole, is from left to right followed successively by 31, second, the first step hole that internal diameter becomes larger
Rank hole 32, third stepped hole 33；The left part for rotating ectosome 4 is equipped with stepped hole, is from left to right followed successively by internal diameter gradually smaller the
Four stepped holes 41, the 5th stepped hole 42, the 6th stepped hole 43；Annular protrusion 7 is provided in inner shaft 1, annular protrusion 7 is located at the 4th
In stepped hole 41, in inner shaft 1, third stepped hole 33 is internal thread hole in 31 sets of first step hole, and protection end cap 3 is connected by screw thread
Female connector is in the left end of rotation ectosome 4；It is equipped with bearing 6 in the two sides of annular protrusion 7, bearing 6 is using the double of model 7006AC
Column angular contact bearing, bearing 6 include the right bearing positioned at the left bearing 61 in 7 left side of annular protrusion and positioned at 7 right side of annular protrusion
62, the inner ring of two bearings 6 acts against on the corresponding left and right side of annular protrusion 7, and bearing 6 is located at the 4th stepped hole 41 and interior
Between axis 1, the right side in second step hole 32 is acted against to the right on the left of the outer ring of left bearing 61, a left side for the 5th stepped hole 42
Side is acted against to the left on the right side of the outer ring of right bearing 62, is carried out respectively in connection with annular protrusion 7 to left bearing 61 and right bearing 62
It is fixed；High pressure combination sealing 8 is equipped between 6th stepped hole 43 and inner shaft 1, the 6th stepped hole 43 is locating for the high pressure combination sealing 8
Position offers the second seal groove 13 being arranged around inner shaft 1, and the second seal groove 13 is stepped seal groove, the second seal groove 13
Left end internal diameter be less than right end internal diameter, high pressure combination sealing 8 is vertically arranged in the inside of the second seal groove 13, to inner shaft 1 and turns
Sealing function is played in gap between dynamic ectosome 4, and high pressure combination sealing 8 can be set as needed one group or be arranged around inner shaft 1
Multiple groups, the high pressure combination sealing 8 in this example are one group, and high pressure combination sealing 8 is existing product, and internal structure is not done detailed
It illustrates.
First step hole 31 is equipped with the first seal groove 11 and is equipped with sealing ring, and lip-type packing is used in the present embodiment
5, lip-type packing 5 is arranged perpendicular to inner shaft 1, and lip-type packing 5 surround and is set on the lateral wall of inner shaft 1, the first seal groove
11 are arranged in the contact position in first step hole 31 Yu inner shaft 1, and the first seal groove 11 is annular and is arranged around inner shaft 1 that first is close
Towards inner shaft 1, the lateral wall of lip-type packing 5 is deep into inside the first seal groove 11 opening of sealing groove 11, can be effectively prevent
Extraneous impurity enters the inside of bearing 6 and inner shaft drainage channel 9 from the gap of inner shaft 1 and protection end cap 3；4th stepped hole
There is horizontal limit sleeve 12 to the left on 41 left side wall and limit sleeve 12 is fixedly connected with protection ectosome 4, the left end of limit sleeve 12
It is resisted against on the right side in second step hole 32, the outer ring of limit sleeve 12 is provided with external screw thread, and the inner ring pressing of limit sleeve 12 exists
Fixed function is played to bearing 6 in the outer ring of bearing 6, the spiral shell of internal screw thread on the external screw thread and third stepped hole 33 on limit sleeve 12
Line direction of rotation is with the rotation direction of rotation ectosome 4 on the contrary, rotation ectosome 4 and protection end cap 3 are connect by reverse thread, to prevent
Rotation stop moves rotation ectosome 4 caused by ectosome 4 rotates and the connection of end cap 3 is protected to loosen.
Inner shaft 1 is internally provided with inner shaft drainage channel 9, and rotation ectosome 4 is internally provided with ectosome drainage channel 10, interior
The center line of axis drainage channel 9 and ectosome drainage channel 10 is overlapped and internal diameter is identical, and inner shaft drainage channel 9 is by being arranged in inner shaft
Buffer channel 14 between drainage channel 9 and ectosome drainage channel 10 connects, and buffer channel 14 is that inner shaft 1 and rotation ectosome 4 enclose
At confined space, the leakage of high pressure water will not be caused, the internal diameter of buffer channel 14 is identical as the outer diameter of inner shaft 1, inner shaft draining
The right end in channel 9 is connected to the left end of ectosome drainage channel 10, and the right side of inner shaft 1 is not contacted with rotation ectosome 4, can be prevented
The right side of inner shaft 1 and rotation ectosome 4 rub for a long time, to avoid the end wear of inner shaft 1.
When implementing, inner shaft 1 is connected by quick connector with high-pressure rubber pipe the utility model, rotation ectosome 4 and high densification
The connection of seal drill rod tail portion, inner shaft 1 follow high-pressure rubber pipe to remain stationary, and rotation ectosome 4 and protection end cap 3 follow high pressure sealing drilling rod
It rotates synchronously, ectosome 4 is rotated under the action of bearing 6 and protection end cap 2 is rotated around inner shaft 1, lip-type packing 5 prevents outside
Impurity enters inside high pressure water pigtail, and high pressure combination sealing 7 prevents high pressure water from will not rotate in rotation ectosome 4 relative to inner shaft 1
It is leaked from the gap of rotation ectosome 4 and inner shaft 1 in the process, the pressure of high pressure water is kept not lose, high pressure water is from high-pressure rubber pipe
Into in inner shaft drainage channel 9, is then entered in ectosome drainage channel 10 by buffer channel 14, be then transferred to high densification
At seal drill rod, subsequent discharge is carried out to carry out the operations such as hydraulic flushing in hole, the utility model has easy to connect, wear-resistant in a word
And the advantages of good seal performance.
Claims (7)
1. a kind of coal mine drilling high pressure water pigtail, connect with high-pressure rubber pipe and high pressure sealing drilling rod respectively, it is characterised in that: including
Inner shaft (1) and rotary body (2), the inner shaft (1) are horizontally disposed in left-right direction, and the left end of inner shaft (1) is connect with high-pressure rubber pipe,
The right end of rotary body (2) is connect with high pressure sealing drilling rod, and the rotary body (2) includes protection end cap (3) and rotates ectosome (4),
The right end of inner shaft (1) horizontal through protection end cap (3) and be deep into rotation ectosome (4) inside, inner shaft (1) and protection end cap
(3) it is rotatablely connected with rotation ectosome (4), protection end cap (3) is equipped with stepped hole, is from left to right followed successively by what internal diameter became larger
First step hole (31), second step hole (32), third stepped hole (33)；The left part for rotating ectosome (4) is equipped with stepped hole, from a left side
Gradually smaller 4th stepped hole (41) of internal diameter, the 5th stepped hole (42), the 6th stepped hole (43) are followed successively by the right side；Inner shaft (1)
On be provided with annular protrusion (7), annular protrusion (7) is located in the 4th stepped hole (41), and first step hole (31) are covered in inner shaft (1)
On, first step hole (31) are equipped with the first seal groove (11) and are equipped with sealing ring, and third stepped hole (33) is internal thread hole, right
It should be equipped with external screw thread in rotation ectosome (4) left end, protection end cap (3), which is connected through a screw thread, to be covered in the left end of rotation ectosome (4)；?
The two sides of annular protrusion (7) are equipped with bearing (6), and bearing (6) includes the left bearing (61) and position on the left of annular protrusion (7)
Right bearing (62) on the right side of annular protrusion (7), the inner ring of two bearings (6) act against annular protrusion (7) left and right accordingly
On side, between the 4th stepped hole (41) and inner shaft (1), the right side of second step hole (32) abuts against to the right bearing (6)
On the left side of the outer ring of left bearing (61), high pressure combination sealing (8) are equipped between the 6th stepped hole (43) and inner shaft (1), the
The left side of five stepped holes (42) is acted against to the left on the right side of the outer ring of right bearing (62)；Inner shaft (1) is internally provided with
Inner shaft drainage channel (9), rotation ectosome (4) are internally provided with ectosome drainage channel (10), the right end of inner shaft drainage channel (9)
It is connected to the left end of ectosome drainage channel (10).
2. a kind of coal mine drilling high pressure water pigtail according to claim 1, it is characterised in that: the inner shaft (1) passes through
Slotting pin end is directly connected to high-pressure rubber pipe fastly, and slotting pin end inserts pin end or D type using K-type fastly and inserts pin end fastly fastly.
3. a kind of coal mine drilling high pressure water pigtail according to claim 1, it is characterised in that: the rotation ectosome (4)
Left end in the middle part of be provided with horizontal limit sleeve (12) to the left, the left end of limit sleeve (12) is resisted against the right side of second step hole (32)
On end face, the outer ring of limit sleeve (12) is provided with external screw thread, the outer ring of limit sleeve (12) and the inner ring spiral shell of third stepped hole (33)
Line connection, the inner ring of limit sleeve (12) are connect with the outer ring of bearing (6).
4. a kind of coal mine drilling high pressure water pigtail according to claim 1, it is characterised in that: the rotation ectosome (4)
The second seal groove (13) around inner shaft (1) setting is offered on inner sidewall, the second seal groove (13) is stepped seal groove, institute
Inside of high pressure combination sealing (8) setting stated in the second seal groove (13).
5. a kind of coal mine drilling high pressure water pigtail according to claim 1, it is characterised in that: the bearing (6) uses
Double row angular contact bearing.
6. a kind of coal mine drilling high pressure water pigtail according to claim 1, it is characterised in that: the inner shaft drainage channel
(9) it is overlapped with the center line of ectosome drainage channel (10) and internal diameter is identical, right end and the ectosome draining of inner shaft drainage channel (9) are logical
Road (10) left end is communicated with buffer channel (14), and the internal diameter of buffer channel (14) is identical as the outer diameter of inner shaft (1).
7. a kind of coal mine drilling high pressure water pigtail according to claim 1, it is characterised in that: the third stepped hole
(33) rotation of rotation direction of thread and rotation ectosome (4) on internal thread hole and on the external screw thread of rotation ectosome (4) left end
It is contrary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821527263.8U CN208763594U (en) | 2018-09-19 | 2018-09-19 | A kind of coal mine drilling high pressure water pigtail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821527263.8U CN208763594U (en) | 2018-09-19 | 2018-09-19 | A kind of coal mine drilling high pressure water pigtail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208763594U true CN208763594U (en) | 2019-04-19 |
Family
ID=66136787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821527263.8U Expired - Fee Related CN208763594U (en) | 2018-09-19 | 2018-09-19 | A kind of coal mine drilling high pressure water pigtail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208763594U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113645794A (en) * | 2021-07-15 | 2021-11-12 | 北京遥测技术研究所 | Double-layer convolution type sealing structure and method based on height difference |
-
2018
- 2018-09-19 CN CN201821527263.8U patent/CN208763594U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113645794A (en) * | 2021-07-15 | 2021-11-12 | 北京遥测技术研究所 | Double-layer convolution type sealing structure and method based on height difference |
| CN113645794B (en) * | 2021-07-15 | 2023-01-06 | 北京遥测技术研究所 | Double-layer convolution type sealing structure and method based on height difference |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208763594U (en) | A kind of coal mine drilling high pressure water pigtail | |
| CN201963243U (en) | Intellectual full-automatic sucker rod seals blowout preventer | |
| CN202108414U (en) | High-pressure post-positioned water swivel | |
| CN105909897B (en) | A kind of automatic compensation type high-pressure rotary joint | |
| CN114059930A (en) | Controllable drill rod device for directional drilling of drill bit | |
| CN208764526U (en) | A kind of coal mine high pressure rotary sealing connector | |
| CN206845570U (en) | Hard sealing low discharge reversal valve | |
| CN103615542A (en) | Novel water seal used for drilling machine power head | |
| CN205400661U (en) | Colliery is hydraulic fracturing hole packer in pit | |
| CN205745773U (en) | A kind of automatic compensation type high-pressure rotary joint | |
| CN202392109U (en) | Two-stage seal structure for dynamic seal of underground dynamic drilling tool | |
| CN205044842U (en) | Thrust wheel with thermal diffusivity and leakproofness are good | |
| CN204691696U (en) | A kind of high-temperature metal sealing petroleum tube connector | |
| CN206608401U (en) | A kind of hydraulic support column seal with annular groove attachment structure | |
| CN203476359U (en) | Novel small-flow reversing valve | |
| CN203961966U (en) | Rotary valve mud pulse generator | |
| CN112081538A (en) | Double-flow-passage fluid injection device | |
| CN207598192U (en) | A kind of drilling machine water becomes head pressurization leakage-proof liquid device | |
| CN205713958U (en) | A kind of ball-type well dynamic instrument | |
| CN201943592U (en) | Novel external thickening oil pipe and sleeve | |
| CN204061913U (en) | A kind of adjustable hinge seal device of rectangular shield push-bench | |
| CN204663475U (en) | The rotation injection head of cementing head | |
| CN2644808Y (en) | All-welded ball valve | |
| CN202745717U (en) | High-pressure-resistant drill bit | |
| CN218953258U (en) | High-pressure sealing grooving drill rod |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190419 Termination date: 20200919 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |