CN209637707U - A kind of built-in hydraulic slips of automatic centering - Google Patents
A kind of built-in hydraulic slips of automatic centering Download PDFInfo
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- CN209637707U CN209637707U CN201920167442.3U CN201920167442U CN209637707U CN 209637707 U CN209637707 U CN 209637707U CN 201920167442 U CN201920167442 U CN 201920167442U CN 209637707 U CN209637707 U CN 209637707U
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- slips
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- automatic centering
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Abstract
The utility model discloses a kind of built-in hydraulic slips of automatic centering, including slip spider, connector, slips body and connection component, slips body is arranged inside slip spider, and connector is provided between slips body and slip spider, connection component is connect with connector and slip spider inner wall respectively, and the utility model solves the technical problem that slips clamping diameter is small in the prior art.
Description
The utility model be the applying date be on September 12nd, 2018, utility model is entitled " a kind of built-in hydraulic slips "
Chinese utility model application NO.2018214947231 divisional application.
Technical field
The utility model relates to petroleum, natural gas and geological prospecting engineering device technique field more particularly to a kind of automatic centerings
Built-in hydraulic slips.
Background technique
Well known oil field operation is mainly exactly that many endowels are connected into a root long tubing string, and linking together
Long string resolves into many endowels；The drilling tool etc. that underground is installed from combination, decomposable process, reaches oil recovery purpose；However
When pipe string combination, operation splitting, it is necessary to which by two elevator rotations back and forth, one as elevator, another, which is served as, sits card, takes turns
The role for changing two elevators needs operation work in well head constantly lift to move, and lift to move elevator is a heavy work, needs strong youth
People, however well head working environment very severe, there is the unpredictable things such as blowout, eminence junk, the hydrogen sulfide gas that flies out at any time
Occur, jeopardize personal safety, so liberation operation work manual labor, is the most important thing of trouble free service；Existing hydraulic pressure pipe slips
Device clamping diameter is small, at high cost.
Authorization Notice No. are as follows: the patent of 202832290 U of CN discloses a kind of hydraulic pressure pipe slips, including cover board, the cover board
It is connected with the dental lamina for going deep into the chassis interior of reverse taper in the axial direction, hydraulic cylinder is equipped between pedestal and cover board,
The dropping process of oil pipe is set to be changed to lean on the active landing of effect of hydraulic cylinder by falling by gravity passive type, descent can
Control can prevent oil pipe descent from radial deflection occurs, and the dental lamina is three-clove style structure in radial directions, in the axial direction
Upper is three stage structure, and three sections of intermediate plates successively thickened from bottom to up are arranged in the external of dental lamina, and such setting can guarantee dental lamina
Bigger with the contact surface of oil pipe, to reduce dental lamina to the impression of oil pipe, intermediate plate is three-clove style structure in radial directions, folder
The external setting of piece is the guide plate of three-clove style structure in radial directions, and the lower end of guide plate, which is equipped with, stretches to internal boss,
For carrying intermediate plate and dental lamina；But the clamping diameter of the patent is small, is not able to satisfy the market demand.
Utility model content
The purpose of the utility model is to provide a kind of built-in hydraulic slips of automatic centering, solve in the prior art
Hydraulic pressure pipe slips clamping diameter is small, safety is poor and the technical issues of without centralising device.
A kind of built-in hydraulic slips of automatic centering, including slip spider, connector, slips body and connection component, it is described
Slips body is arranged inside slip spider, and connector is provided between slips body and slip spider, and the connection component is respectively and even
Junctor is connected with slip spider inner wall.
Based on the above technical solution, the utility model can also do following improvement:
Further, the connection component includes two hydraulic cylinders, a splined shaft and two connecting rod pieces, the hydraulic cylinder
Interval setting, and the piston-rack of hydraulic cylinder is engaged with splined shaft, and connecting rod piece, two connecting rods are equipped on the splined shaft
The end of piece is connected by pin shaft, and the pin shaft passes through the connector, and the beneficial effect using this step is by hydraulic cylinder
Piston-rack is used cooperatively with splined shaft, when the piston-rack of such hydraulic cylinder moves, splined shaft rotation is able to drive, thus band
Dynamic connecting rod piece is rotated around splined shaft, therefore connector can move up and down.
Further, the hydraulic cylinder is oil cylinder with gear racks, and the beneficial effect using this step is that oil cylinder with gear racks can be completed to spend
The rotation counterclockwise and clockwise of key axis.
Further, connecting key is provided between the inside of the connector and the outside of slips body, the connecting key is logical
The inside that screw is mounted on the connector is crossed, the beneficial effect using this step is to install slips body by connecting key, guarantees card
The stable structure of watt body.
Further, the taper difference of the connector is not less than 80mm, and the beneficial effect using this step is can to expand in this way
The clamping diameter of big slips body.
Further, cover board is installed on the slip spider, mud scraping disc is installed, and cover board bottom is pacified above the cover board
Equipped with centralising device, the beneficial effect using this step is that mud scraping disc installs the annular floating slot that is formed on the cover board, when trip-out, is scraped
Mud pan embraces drilling rod and floats in annular floating slot with the swing of drilling rod, and carry out drilling rod scrapes mud operation.
Further, the cover board is formed by two semicircle cover plate combinations, and each half closing disk bottom is mounted on centering
Device, the centralising device include centering pendular body and push hydraulic cylinder, and the centering pendular body is semicircular, the centering pendulum
Kinetoplast one end is mounted on half closing disk bottom by pin shaft, and the other end is connect with the output end of the push hydraulic cylinder, described to push away
Liquor charging cylinder pressure is mounted on half closing disk bottom, and the beneficial effect using this step is to carry out centering by centralising device, well head not
It can be used normally in the case where just.
Further, slips body bottom is equipped with gas mud-scraping ring, and the beneficial effect using this step is to pass through gas
Mud-scraping ring carries out jet and scrapes mud.
Further, it further includes replacement power slip binding clip device, and the replacement power slip binding clip device is mounted on
Above connector, the beneficial effect using this step is to shorten slips body more using " give up and lock, pull-out was both unclamped " design
Change the time.
Further, the clamping range of the slips body is 2-7/8 " --- 13-3/8 " mm.
The utility model has the beneficial effects that
1. the utility model provides a kind of built-in hydraulic slips of automatic centering, wherein connector uses unique auger
The design of face difference, slips body are moved up and down apart from small, and diametrical direction changes greatly.After being mounted on turntable, either working condition and non-
The upper plane of working condition, built-in hydraulic driving clamp tile is flushed with drilling platforms, does not influence the use of the other tools of drilling platforms.
2. the utility model is internally provided with connection component in slip spider, slips body and company can be completed by connection component
The upper and lower movement of junctor.
3. the utility model is built-in hydraulic slips, it is mounted in drilling platforms, security performance is high.
4. the utility model is provided with centralising device, centering is carried out by centralising device, well head not just in the case where
It can normal use；
5. the clamping range of the utility model is big, fast changing slips body, can have with the pipe of clamping different-diameter, cost
It is low.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural representation of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment
Figure；
Fig. 2 is a kind of connection component of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment
With the structural schematic diagram of slip spider；
Fig. 3 is a kind of connection component of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment
With the cross-sectional view of slip spider；
Fig. 4 be a kind of hydraulic cylinder of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment and
The structural schematic diagram of splined shaft；
Fig. 5 is a kind of top view of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment；
Fig. 6 is a kind of centralising device of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment
Bottom view；
Fig. 7 is a kind of centralising device of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment
Structural schematic diagram；
Fig. 8 is a kind of replacement power of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment
The structural schematic diagram of slips binding clip device connection；
Fig. 9 is a kind of replacement power of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment
The shaft side figure of slips binding clip device connection；
Figure 10 is a kind of connector of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment
Structural schematic diagram；
Figure 11 is a kind of ejector pin portion of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment
The enlarged diagram divided；
Figure 12 scrapes for a kind of gas of the built-in hydraulic slips of automatic centering described in the utility model specific embodiment
The top view of mud ring；
Appended drawing reference:
1- slip spider；2- connector；3- slips body；4- connection component；5- hydraulic cylinder；6- splined shaft；7- connecting rod piece；8- is living
Fill in rack gear；9- pin shaft；10- connecting key；11- cover board；12- mud scraping disc；13- screw；14- centralising device；15- gas mud-scraping ring；
16- replaces power slip binding clip device；
1401- centering pendular body；1402- pushes hydraulic cylinder；1403- pin shaft；1404- limiting slot；1405- limited block；
1601- release member；1602- locking member；1603- mounting groove；1604- unlocks drop handle；1605- fixed block；
1606- lifting segment；1607- unlocks section；1608- lifting hole(eyelet)；1609- through slot；1610- protrusion；1611- locking bed；1612- pressing plate；
1613- ejector pin；1614- shaft；1615- pressing plate；1616- pin hole；1617- spring.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solutions of the utility model.Following embodiment is only
For clearly illustrating the technical solution of the utility model, therefore it is only used as example, and it is originally practical to cannot be used as a limitation limitation
Novel protection scope.
It should be noted that unless otherwise indicated, technical term or scientific term used in this application should be this reality
The ordinary meaning understood with novel one of ordinary skill in the art.
In the description of the present application, it is to be understood that term " center ", "upper", "lower", "top", "bottom" "inner", "outside"
The orientation or positional relationship of equal instructions is to be based on the orientation or positional relationship shown in the drawings, and being merely for convenience of description, this is practical new
Type and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation
Construction and operation, therefore should not be understood as limiting the present invention.
In this application unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
Embodiment
As shown in Figure 1, a kind of built-in hydraulic slips of automatic centering provided by the utility model, including slip spider 1,
Connector 2, slips body 3 and connection component 4, the slips body 3 are arranged inside slip spider 1, and slips body 3 and slip spider 1 it
Between be provided with connector 2, the connection component 4 is connect with connector 2 and 1 inner wall of slip spider respectively；Slips body 3 and connector 2
It is cooperatively connected, connection component 4 can drive connector 2 to move up and down relative to slip spider 1, and slips body 3 can be driven to transport
It is dynamic.
As shown in Figs 1-4, the connection component 4 includes two hydraulic cylinders, 5, two splined shafts 6 and two connecting rod pieces 7, institute
The setting of the interval of hydraulic cylinder 5 is stated, and the piston-rack 8 of hydraulic cylinder 5 is engaged with splined shaft 6, is equipped with connecting rod piece on the splined shaft 6
7, the end of two connecting rod pieces 7 is connected by pin shaft 9, and the pin shaft 9 passes through the connector 2, and hydraulic cylinder 5 is rack gear oil
Cylinder, the movement of the piston-rack 8 of hydraulic cylinder 5 drive splined shaft 6 counterclockwise or rotate clockwise, while connecting rod piece 7 is and then transported
Dynamic, 7 one end of connecting rod piece is mounted on splined shaft 6, and the other end is connected by pin shaft 9, and pin shaft is located inside the connector 2,
This makes it possible to drive connector 2 to move；The utility model hydraulic cylinder 5 moves above and below, is transported by 7 about 2 connector of connecting rod piece
It is dynamic, so that slips body 3 be driven to move above and below, when slips body downlink, push drilling rod to collapse to center, clamping drilling rod.Conversely, loose
Spud in bar, while conceding channel, guarantees that drilling rod is passed freely through from slips center.
As shown in Figure 1, being provided with connecting key 10, connector 2 between the inside of the connector 2 and the outside of slips body 3
It is fixed by screw 13 between connecting key 10, guarantee the stability of connecting key, while the outside of connecting key 10 and slips in this way
Body 3 cooperates, and guarantee slips body 3 in this way can move together with connector 2.
As shown in Figure 1, the taper difference of the connector 2 is not less than 80mm, the taper difference energy of the connector 2 of the utility model
Enough reaching 80mm, such slips body 3 is moved up and down apart from small, after being mounted on turntable, either working condition and inoperative shape
The upper plane of state, built-in hydraulic driving clamp tile is flushed with drilling platforms, does not influence the use of the other tools of drilling platforms.
As shown in figure 5, being equipped with cover board 11 above the slip spider 1, mud scraping disc 12 is installed above the cover board 11, is scraped
Mud pan 12 installs the annular floating slot formed on the cover board, and the mud scraping disc 12 in the utility model is located at the middle part of cover board, pulls out of hole
When, mud scraping disc embraces drilling rod and floats in annular floating slot with the swing of drilling rod, and carry out drilling rod scrapes mud operation.
As shown in fig. 6-7, the utility model is provided with centralising device 14 below cover board, is carried out pair by centralising device 14
In；Cover board in the utility model is made of two and half closing disks, and it and is turned-out that half closing disk, which is hinged on slip spider,
Turn, each half closing disk bottom is equipped with a centralising device 14, and wherein centralising device 14 includes centering pendular body 1401 and pushes away
Liquor charging cylinder pressure 1402, the centering pendular body 1401 are located at half closing disk bottom, and centering pendular body 1401 is half ring-like, described right
Middle 1401 one end of pendular body is mounted on half closing disk bottom by pin shaft 1403, and the other end is defeated with the push hydraulic cylinder 1402
Outlet connection, the push hydraulic cylinder 1402 are mounted on half closing disk bottom；Pair of two centralising devices 14 in the utility model
Middle pendular body can combine to form ring-type, clamp mud scraping disc 12 with this；Push hydraulic cylinder 1402 can push centering pendular body
1401 rotate around pin shaft 1403, and multiple limiting slots 1404 are additionally provided with below cover board 11, to the outer of middle pendular body 1401
Limited block 1405 is additionally provided on edge, the limited block 1405 is arranged inside limiting slot 1404, can limit centering pendulum in this way
When the direction of motion of kinetoplast 1401, in this way guarantee operation, horizontal movement when workpiece.
As shown in Figure 1, the clamping range of the slips body 3 is 2-7/8 " --- 13-3/8 " mm.
As shown in Fig. 1,12,3 bottom of slips body is equipped with gas mud-scraping ring 15, carries out jet by gas mud-scraping ring
Scrape mud, the gas mud-scraping ring 15 be it is existing, details are not described herein again.
Wherein, as illustrated in figs. 8-11, it further includes replacement power slip binding clip device 16, the replacement power slip binding clip
Device 16 is mounted on 2 top of connector, realizes the quick-replaceable of slips body, is designed using " give up and lock, pull-out was both unclamped ",
Shorten the replacing construction of slips body, the patent document of the replacement power slip binding clip device 16 and application number 2017113490407
The mechanism of description is consistent, is convenient for fast changing slips, which includes release member 1601 and lock
Tight component 1602 offers mounting groove 1603 on the outside of slips body, and release member 1601 is arranged inside mounting groove 1603,
Middle release member 1601 includes fixed block 1605 and unlock drop handle 1604, and the unlock drop handle 1604 is located at the mounting groove 1603
Inside, and unlocking drop handle 1604 includes lifting segment 1606 and unlock section 1607, the lifting segment 1606 is located in unlock section 1607
Side, and lifting hole(eyelet) 1608 is offered above lifting segment 1606, through slot 1609, the fixed block are offered inside the unlock section 1607
1605 both ends are fixed on inside the mounting groove 1609, and are located inside the through slot 1609 in the middle part of fixed block 1605, described solid
The width for determining block 1605 is greater than the width of part on the mounting groove 1603；
The mounting groove 1605 is step type, and the width of part is greater than the lower part of mounting groove 1605 on mounting groove 1605
Width；
Protrusion 1610, raised 1610 outer end are provided on the outer wall of the unlock section 1607 of the unlock drop handle 1604
Face is horizontal plane；
Wherein, described locking structure 1602 include locking bed 1611, pressing plate 1612 and multiple top pins 1613, the locking bed
1611 interval settings, and locking bed 1611 is internally provided with shaft 1614, is connected with the pressing plate between the shaft 1614
1615, it is spaced apart on the connector 2 and is equipped with pin hole 1616, described 1613 one end of ejector pin is arranged inside pin hole 1616, another
End is contacted with 1612 bottom of pressing plate, and the inside of the pressing plate 1612 is contacted with described raised 1610, is set on the ejector pin 1613
There is spring 1617.
When replacing binding clip, lift unlock drop handle 1604, unlock drop handle 1604 unlocks section in 1603 internal slide of mounting groove
1607 protrusion 1610 just will push pressing plate 1612, and pressing plate 1615 will rotate under the action of turning 1614, finally with it is convex
Rise 1610 tangent, when unlocking drop handle 1604 and moving to certain altitude, fixed block 1605 reaches 1609 bottom of through slot, unlocks drop handle
1604 move upwardly together with regard to stretchy binding clip, and pressing plate 1615 will not push down protrusion 1610 at this time, and such binding clip can be hung
It takes on and；During installation, similarly, unlock drop handle 1604 is first hung, is then put into binding clip, the last rotation of pressing plate 1612 is pushed down
Protrusion 1610, to complete the locking of binding clip.
In the specification of the utility model, numerous specific details are set forth.It is to be appreciated, however, that the reality of the utility model
Applying example can practice without these specific details.In some instances, well known method, knot is not been shown in detail
Structure and technology, so as not to obscure the understanding of this specification.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
It states and is necessarily directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be with
It can be combined in any suitable manner in any one or more of the embodiments or examples.In addition, without conflicting with each other, this field
Technical staff can by the feature of different embodiments or examples described in this specification and different embodiments or examples into
Row combination and combination.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type, should all cover in the claim of the utility model and the range of specification.
Claims (7)
1. a kind of built-in hydraulic slips of automatic centering, which is characterized in that including slip spider, connector, slips body and connection
Component, the slips body is arranged inside slip spider, and connector is provided between slips body and slip spider, the connection component
It is connect respectively with connector and slip spider inner wall, the connection component includes two hydraulic cylinders, a splined shaft and two connecting rods
Piece, the hydraulic cylinder interval setting, and the piston-rack of hydraulic cylinder is engaged with splined shaft, is equipped with connecting rod on the splined shaft
The end of piece, two connecting rod pieces is connected by pin shaft, and the pin shaft passes through the connector, is equipped on the slip spider
Cover board, the cover board top is equipped with mud scraping disc, and cover board bottom is equipped with centralising device, and the cover board is by two and half closing disks
It is composed, each half closing disk bottom is mounted on centralising device, and the centralising device includes centering pendular body and push liquid
Cylinder pressure, the centering pendular body are semicircular, and centering pendular body one end is mounted on half closing disk bottom by pin shaft, another
It holds and is connect with the output end of the push hydraulic cylinder, the push hydraulic cylinder is mounted on half closing disk bottom.
2. a kind of built-in hydraulic slips of automatic centering according to claim 1, which is characterized in that the hydraulic cylinder is
Oil cylinder with gear racks.
3. a kind of built-in hydraulic slips of automatic centering according to claim 1, which is characterized in that the connector
Connecting key is provided between inside and the outside of slips body, the connecting key is mounted on the inside of the connector by screw.
4. a kind of built-in hydraulic slips of automatic centering according to claim 1, which is characterized in that the connector
Taper difference is not less than 80mm.
5. a kind of built-in hydraulic slips of automatic centering according to claim 1, which is characterized in that it further includes gas
Mud-scraping ring, the gas mud-scraping ring are mounted on the slip spider bottom.
6. a kind of built-in hydraulic slips of automatic centering according to claim 1, which is characterized in that it further includes replacement
Power slip binding clip device, the replacement power slip binding clip device are mounted on above connector.
7. a kind of built-in hydraulic slips of automatic centering according to claim 1, which is characterized in that the slips body
Clamping range is 2-7/8 " --- 13-3/8 " mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920167442.3U CN209637707U (en) | 2018-05-04 | 2018-09-12 | A kind of built-in hydraulic slips of automatic centering |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820668542 | 2018-05-04 | ||
| CN201920167442.3U CN209637707U (en) | 2018-05-04 | 2018-09-12 | A kind of built-in hydraulic slips of automatic centering |
| CN201821494723.1U CN209040774U (en) | 2018-05-04 | 2018-09-12 | A kind of built-in hydraulic slips |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821494723.1U Division CN209040774U (en) | 2018-05-04 | 2018-09-12 | A kind of built-in hydraulic slips |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209637707U true CN209637707U (en) | 2019-11-15 |
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ID=67057442
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920167442.3U Active CN209637707U (en) | 2018-05-04 | 2018-09-12 | A kind of built-in hydraulic slips of automatic centering |
| CN201821494723.1U Active CN209040774U (en) | 2018-05-04 | 2018-09-12 | A kind of built-in hydraulic slips |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821494723.1U Active CN209040774U (en) | 2018-05-04 | 2018-09-12 | A kind of built-in hydraulic slips |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109138867A (en) * | 2018-05-04 | 2019-01-04 | 江苏诚创智能装备有限公司 | A kind of built-in hydraulic slips |
| CN115126427A (en) * | 2022-07-07 | 2022-09-30 | 江苏诚创智能装备有限公司 | Intelligent power slip and using method and system thereof |
-
2018
- 2018-09-12 CN CN201920167442.3U patent/CN209637707U/en active Active
- 2018-09-12 CN CN201821494723.1U patent/CN209040774U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109138867A (en) * | 2018-05-04 | 2019-01-04 | 江苏诚创智能装备有限公司 | A kind of built-in hydraulic slips |
| CN115126427A (en) * | 2022-07-07 | 2022-09-30 | 江苏诚创智能装备有限公司 | Intelligent power slip and using method and system thereof |
| CN115126427B (en) * | 2022-07-07 | 2023-08-11 | 江苏诚创智能装备有限公司 | Application method and application system of intelligent power slip |
Also Published As
| Publication number | Publication date |
|---|---|
| CN209040774U (en) | 2019-06-28 |
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