CN207765551U - A kind of pile and its assembly tool - Google Patents
A kind of pile and its assembly tool Download PDFInfo
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- CN207765551U CN207765551U CN201820240705.4U CN201820240705U CN207765551U CN 207765551 U CN207765551 U CN 207765551U CN 201820240705 U CN201820240705 U CN 201820240705U CN 207765551 U CN207765551 U CN 207765551U
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- pressing plate
- pile
- plate
- stretching screw
- crossbeam
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Piles And Underground Anchors (AREA)
Abstract
The utility model discloses a kind of piles, including pile body, the both sides of pile body are provided with end plate, two end plates lock nut by stretching screw and compress pile body, and it is provided with spring between locking nut and the outer surface of end plate, stretching screw includes the lower stretching screw of the upper stretching screw of the top edge for tensing end plate and the lower edge for tensing end plate, and upper stretching screw is corresponded with lower stretching screw；Crossbeam is additionally provided between spring and locking nut, and the homonymy that each above stretching screw and corresponding lower stretching screw correspond to pile body is set on the same crossbeam；The crossbeam of homonymy is connected by connecting plate, and connecting plate is between spring and crossbeam.Above-mentioned pile, reduces the workload of locking nut, while ensure that the accuracy of the decrement of spring when pile assembles.In addition the invention also discloses a kind of assembly tools of pile, for being assembled to above-mentioned pile.
Description
Technical field
The utility model is related to pile technical field more particularly to a kind of piles and its assembly tool.
Background technology
Pile is the abbreviation of battery pack, and structure generally comprises pile body and the end plate in pile body both sides, end plate is arranged
Be circumferentially provided with one week through-hole being evenly arranged, after the through-hole that stretching screw is passed through to two end plates, carried out using nut tight
Gu in order to ensure that two end plates to the stability of the pressing force of pile body, are generally both provided with spring below nut.Electricity at present
The assembling of heap mainly assembles pile first on assembly platform including two step processes；Then it will tentatively be completed
Pile is transferred to press stations, and after being compressed to two end plates by forcing press, stretching screw and nut are by pile body both sides
End plate be strained and fixed and finally release stress, spring stress.
But current pile assembling mode, using the artificial all nuts for tightening pile both sides, not only heavy workload, but also
The consistency of the pressure of the make-up of each nut be not easy to ensure namely a certain specified pressure under pile spring decrement standard
True property is not easy to ensure；And since the stretching screw circumferentially of the end plate of pile both sides is limited in space, lead to bullet
The size of spring be not easy it is excessive, then conventional spring it is difficult to ensure that pile normal use pressure, so that pile is susceptible to leakage
Risk；In addition, no external force has compression to pile among the end plate of pile, it is higher to the Structural strength calls of end plate.
In conclusion how to solve accuracy the asking of being not easy to ensure of heavy workload and the decrement of spring when pile assembling
Topic, it has also become those skilled in the art's technical barrier urgently to be resolved hurrily.
Utility model content
The purpose of this utility model is to provide a kind of pile and its assembly tool, to reduce workload, while ensureing pile
The accuracy of the decrement of spring when assembling.
To achieve the goals above, the utility model provides a kind of pile, including pile body, the both sides of the pile body
It is provided with end plate, two end plates lock nut by stretching screw and compress the pile body, and the locking nut
Spring is provided between the outer surface of the end plate, the stretching screw includes the top edge for tensing the end plate
The lower stretching screw of stretching screw and lower edge for tensing the end plate, and the upper stretching screw and the lower tension spiral shell
Bar corresponds；Be additionally provided with crossbeam between the spring and the locking nut, and each upper stretching screw and and its
The homonymy that the corresponding lower stretching screw corresponds to the pile body is set on the same crossbeam；The crossbeam of homonymy passes through
Connecting plate connects, and the connecting plate is between the spring and the crossbeam.
Content, above-mentioned pile, including pile body are introduced compared to background technology, the both sides of pile body are provided with end plate, and two
A end plate locks nut by stretching screw and compresses pile body, and is provided with bullet between locking nut and the outer surface of end plate
Spring, stretching screw only include the drop-down of the upper stretching screw of the top edge for tensing end plate and the lower edge for tensing end plate
Tight screw rod, and upper stretching screw is corresponded with lower stretching screw；Crossbeam is additionally provided between spring and locking nut, and each
The homonymy that upper stretching screw and corresponding lower stretching screw correspond to pile body is set on the same crossbeam；The crossbeam of homonymy
It is connected by connecting plate, and connecting plate is between spring and crossbeam.Due to being provided only for connecting the upper of the top edge of end plate
The lower stretching screw of stretching screw and lower edge for connecting end plate, compared to the side of traditional circumferentially stretching screw
Formula, greatly reduces the quantity of stretching screw, and then greatly reduces the quantity of manually installed locking nut, then substantially reduces
Workload；In addition, due to being provided with crossbeam and connecting plate between spring and locking nut, then so that the compression of all springs
Face is easier to ensure that the consistency of amount of spring compression so in the plane of an entirety, so ensure that pile assembling when
The accuracy of the decrement of spring.
In addition, the utility model additionally provides a kind of assembly tool of pile, the assembly tool is used in said program
Described pile, including forcing press, are provided with lower platform pressing plate on the lower working face of the forcing press, the forcing press it is upper
Working face is provided with upper mounting plate pressing plate；The upper mounting plate pressing plate and the lower platform pressing plate with the crossbeam of respective side and institute
The outer end face for stating connecting plate is adapted, and is fixedly installed abutment sleeve on the lower platform pressing plate, the abutment sleeve with it is described
The position of stretching screw is corresponding, and the internal diameter of the abutment sleeve is adapted with the locking nut.
The assembly tool of above-mentioned pile, for assembling the pile described in above-mentioned technical proposal, and upper mounting plate pressing plate
It is adapted with the outer end face of crossbeam and connecting plate with lower platform pressing plate, so that upper mounting plate pressing plate and lower platform pressing plate apply
It when pressure, presses simultaneously to all springs of pile, then so that the pressure of spring is more balanced, equally enables to spring
The consistency of decrement is easier to ensure that, and then can also realize the accuracy for improving amount of spring compression.In addition, in lower platform pressure
Abutment sleeve is fixedly installed on plate, abutment sleeve is corresponding with the position of stretching screw, and the internal diameter of abutment sleeve and locking
Nut is adapted so that the locking operation of locking nut is more convenient.
Preferably, between the lower working face and the lower platform pressing plate, the upper working face and the upper mounting plate pressing plate
Between be all made of the mode being detachably connected and fix.
Preferably, between the lower working face and the lower platform pressing plate, the upper working face and the upper mounting plate pressing plate
Between be all made of screw and be fixedly connected.
Preferably, it is both provided with and the outer end face of the end plate on the lower platform pressing plate and on the upper mounting plate pressing plate
The compatible presser feet in corner.
Preferably, it is also both provided on the lower platform pressing plate and on the upper mounting plate pressing plate and the corresponding crossbeam phase
First briquetting of adaptation.
Preferably, be also both provided on the lower platform pressing plate and on the upper mounting plate pressing plate for the corresponding company
The second briquetting that fishplate bar abuts against.
Preferably, it is also both provided with and the corresponding presser feet on the lower platform pressing plate and on the upper mounting plate pressing plate
The contour third briquetting of working face, and the third briquetting is between two adjacent presser feets.
Preferably, the lower platform pressing plate and the upper mounting plate pressing plate respectively with corresponding first briquetting, described
Two briquettings are fixedly connected with the third briquetting by soket head cap screw.
Preferably, the both sides of the lower platform pressing plate are also both provided with handle easy to carry.
Description of the drawings
(stretching screw does not pass through end plate to the positive structure schematic for the pile that Fig. 1 provides for the utility model embodiment
Mode)；
(stretching screw does not pass through end plate to the overlooking structure diagram for the pile that Fig. 2 provides for the utility model embodiment
Mode)；
(stretching screw does not pass through end plate to the left view structural representation for the pile that Fig. 3 provides for the utility model embodiment
Mode)；
(stretching screw passes through the side of end plate to the positive structure schematic for the pile that Fig. 4 provides for the utility model embodiment
Formula)；
Fig. 5 is the structural schematic diagram for the lower platform pressing plate that the utility model embodiment provides；
Fig. 6 is the structural schematic diagram for the upper mounting plate pressing plate that the utility model embodiment provides；
Fig. 7 is the assembling structure schematic diagram of the assembly tool for the pile that the utility model embodiment provides；
Fig. 8 is the enlarged structure schematic diagram of the lower half portion of Fig. 7.
In figure 1 above-Fig. 8,
Pile body 1, end plate 2, stretching screw 3, spring 4, crossbeam 5, connecting plate 6, lower platform pressing plate 7, upper mounting plate pressing plate 8,
Abutment sleeve 9, presser feet 10, the first briquetting 11, the second briquetting 12, third briquetting 13, handle 14, upper stretching screw 15, lower tension
Screw rod 16.
Specific implementation mode
The core of the utility model is to provide a kind of pile and its assembly tool, to reduce workload, while ensureing pile
The accuracy of the decrement of spring when assembling.
In order to make those skilled in the art more fully understand technical solution provided by the utility model, below in conjunction with attached
The utility model is described in further detail with specific embodiment for figure.
As Figure 1-Figure 8, a kind of pile that the utility model embodiment provides, including pile body 1, the two of pile body 1
Side is provided with end plate 2, and two end plates 2 lock nut by stretching screw 3 and compress pile body 1, and locking nut and end plate 2
Outer surface between be provided with spring 4, stretching screw 3 only includes 15 He of upper stretching screw of the top edge for tensing end plate 2
Lower stretching screw 16 for the lower edge for tensing end plate, and upper stretching screw 15 is corresponded with lower stretching screw 16；Spring 4
Crossbeam 5 is additionally provided between locking nut, and each upper stretching screw 15 and corresponding lower stretching screw 16 correspond to electricity
The homonymy of heap body is set on the same crossbeam 5；The crossbeam 5 of homonymy is connected by connecting plate 6, and connecting plate 6 be located at spring 4 with
Between crossbeam 5.What needs to be explained here is that crossbeam is fixed on connecting plate, fixed form is preferably by the way of welding, certainly
Common other of those skilled in the art can also be used to be fixedly connected with mode.It is further to note that the quantity of connecting plate
It can be selected to be arranged to polylith parallel arrangement according to actual demand, can also be to be arranged to the mode of a monoblock, and generally come
It says that connecting plate is preferably placed in the middle part of corresponding end plate, is more conducive to spring in this way and pressing force is applied to the middle part of end plate.And it is right
It is preferably the overlay region of crossbeam and connecting plate to answer the installation position of spring, due to arranging spring between end plate and connecting plate, greatly
Therefore the big arrangement space for improving spring has widened the selectivity of spring model.
Furthermore, it is necessary to which explanation, the position relationship of stretching screw and end plate, can be as shown in Figure 1-Figure 3, tense spiral shell
Bar does not pass through the arrangement of end plate, i.e. stretching screw is only by the top edge of proximal plate and lower edge setting.
Of course, it should be understood that the position relationship of stretching screw and end plate can also be as shown in figure 4, i.e. stretching screw be worn
Cross the arrangement of end plate.In order to make those skilled in the art be better understood from the set-up mode that stretching screw passes through end plate, under
The mode that two end plates are respectively designated as first end plate and the second end plate by face is briefly described, the both sides setting of pile body
End plate is respectively first end plate and the second end plate, and first through hole is provided in first end plate, is provided on the second end plate and first
Corresponding second through-hole of through-hole, stretching screw penetrates first through hole and the second through-hole, and the both sides of stretching screw are right respectively
It should be arranged with first end plate and crossbeam, locking nut successively.And spring is still arranged between end plate and connecting plate, and preferably
It is arranged in the overlay region of crossbeam and connecting plate.
Above-mentioned pile, stretching screw and for tensing the following of end plate on the top edge due to being provided only for tensing end plate
The lower stretching screw of edge greatly reduces the quantity of stretching screw compared to the mode of traditional circumferentially stretching screw, into
And the quantity of artificial locking nut is greatly reduced, then greatly reduce workload；In addition, due to spring and locking nut it
Between be provided with crossbeam and connecting plate, then so that all springs compression face in the plane of an entirety, so more easily
The accuracy of the decrement of spring when ensureing the consistency of amount of spring compression, and then ensure that pile assembling.
In addition, the utility model additionally provides a kind of assembly tool of pile, which is used for institute in said program
The pile of description, including forcing press are provided with lower platform pressing plate 7 on the lower working face of forcing press, and the upper working face of forcing press is set
It is equipped with upper mounting plate pressing plate 8；The outer end face phase of upper mounting plate pressing plate 8 and lower platform pressing plate 7 with the crossbeam of respective side 5 and connecting plate 6
Adaptation, is fixedly installed abutment sleeve 9 on lower platform pressing plate 7, and abutment sleeve 9 is corresponding with the position of stretching screw, and fixed
The internal diameter of position sleeve 9 is adapted with locking nut.
The assembly tool of above-mentioned pile, for assembling the pile described in above-mentioned technical proposal, and upper mounting plate pressing plate
It is adapted with the outer end face of crossbeam and connecting plate with lower platform pressing plate, so that upper mounting plate pressing plate and lower platform pressing plate apply
It when pressure, presses simultaneously to all springs of pile, then so that the pressure of spring is more balanced, equally enables to spring
The consistency of decrement is easier to ensure that, and then can also realize the accuracy for improving amount of spring compression.In addition, in lower platform pressure
Abutment sleeve is fixedly installed on plate, abutment sleeve is corresponding with the position of stretching screw, and the internal diameter of abutment sleeve and locking
Nut is adapted so that the locking operation of locking nut is more convenient.
When stretching screw is only by the lower edges setting of proximal plate, in assembling process, spiral shell will can be first tensed
The corresponding one end of bar installs locking nut, then places to lower platform pressing plate, and locking nut is made to fall into lower platform pressing plate
Abutment sleeve in, be then inserted in crossbeam and connecting plate successively on stretching screw, then in the corresponding position in the top of connecting plate
(overlay region for referring generally to crossbeam and connecting plate) places spring, places one piece of end plate in the top of spring, pacifies on the end plate
Pile body is filled, after the installation for completing pile body, another piece of end plate is put on pile body, corresponding position (refers generally to crossbeam and company
The overlay region of fishplate bar) spring is placed, then connecting plate and crossbeam are placed in the top of spring, and stretching screw is made to sequentially pass through electricity
The crossbeam of heap body both sides, driving pressure machine make upper mounting plate pressing plate press to lower platform pressing plate to predeterminated position, lock on corresponding
The locking nut of platform pressing plate side, locking operation are more convenient.
It, can be first by the corresponding one end of stretching screw in assembling process when stretching screw is arranged across end plate
Locking nut is installed, is then placed to lower platform pressing plate, and locking nut is made to fall into the abutment sleeve of lower platform pressing plate,
Then crossbeam and connecting plate are inserted in successively on stretching screw, is put in corresponding position (overlay region for referring generally to crossbeam and connecting plate)
Spring has been set, then has been inserted in one piece of end plate, pile body is installed on the end plate；After the installation for completing pile body, then in stretching screw
On be inserted in another piece of end plate successively, place spring in corresponding position (overlay region for referring generally to crossbeam and connecting plate), then be inserted in
Connecting plate and crossbeam, driving pressure machine make upper mounting plate pressing plate press to lower platform pressing plate to predeterminated position, and locking is corresponded to and put down
The locking nut of platform pressing plate side, locking operation are more convenient.
In some more particular embodiments, in order to enable a forcing press can complete the dress of various types of piles
With process, between the lower working face and lower platform pressing plate 7 of above-mentioned forcing press, the upper working face of forcing press and upper mounting plate pressing plate 8 it
Between be all made of the mode being detachably connected and fix.And it is preferred that using between lower working face and lower platform pressing plate 7, upper working face with
Screw is all made of between upper mounting plate pressing plate 8 to be fixedly connected.In this way so that the fixation of upper mounting plate pressing plate and lower platform pressing plate is more square
Just simple and fast.What needs to be explained here is that those skilled in the art will readily appreciate that be the fixed structure of screw only
Only it is the preferred fixed form of the utility model embodiment, common other of those skilled in the art can also be used to fix
Connection type, for example, the fixed form of sucked type, is specially respectively provided with through-hole on upper mounting plate pressing plate and lower platform pressing plate, it should
Through-hole is connected with corresponding negative pressure equipment, and the fixation of sucked type is realized in the start and stop by controlling negative pressure equipment.
It is the phenomenon that in order to ensure that entire pile positions more precisely in assembling process, end plate be avoided to misplace, corresponding
Presser feet compatible with the corner of the outer end face of end plate 2 10 is both provided on lower platform pressing plate 7 and on upper mounting plate pressing plate 8.
It is further to note that on lower platform pressing plate 7 and upper mounting plate pressing plate 8 on be also both provided with and corresponding crossbeam 5
Compatible first briquetting 11, for and the second briquetting 12 that abuts against of corresponding connecting plate 6 and with the work of corresponding presser feet 10
Make the contour third briquetting 13 in face, and third briquetting 13 is between two adjacent presser feets 10.By the way that the first briquetting, the is arranged
The arrangement of two briquettings and third briquetting so that the material of upper mounting plate pressing plate and lower platform pressing plate greatlys save.It is of course possible to
Understand, above-mentioned is only the preferable examples of the utility model embodiment by the way of briquetting, and can also be will be upper
The structure that platform pressing plate and lower platform pressing plate are arranged to whole diesinking realizes compatible mode, only for material
Thickness and processing required precision it is excessively high, therefore cost can be relatively high.Furthermore, it is necessary to explanation, above-mentioned third briquetting
Quantity can carry out selection setting according to actual demand, for example be only respectively arranged two on one group of opposite side of corresponding platform pressing plate
The mode of a third briquetting.
It is further to note that above-mentioned lower platform pressing plate 7 and upper mounting plate pressing plate 8 respectively with corresponding first briquetting 11,
Second briquetting 12 is fixedly connected with third briquetting 13 by screw, and screw fixation is preferably consolidated using soket head cap screw
It is fixed.Of course, it should be understood that being only the utility model embodiment above by the mode that soket head cap screw is connected and fixed
Preferable examples can also use common other of those skilled in the art to be fixedly connected with mode, such as the side being welded to connect
Formula etc., the mode being only welded to connect is for the more demanding of welding procedure.
In addition, lower platform pressing plate is installed to the corresponding lower working face of forcing press for convenience, the both sides of lower platform pressing plate 7
Also it is both provided with handle 14 easy to carry.And in general, upper mounting plate pressing plate is not provided with handle.
Pile provided by the utility model and its assembly tool are described in detail above.It should be noted that
Each embodiment in this specification is described in a progressive manner, and the highlights of each of the examples are implement with other
The difference of example, the same or similar parts between the embodiments can be referred to each other.
Specific case used herein is expounded the principles of the present invention and embodiment, above example
Explanation be merely used to help understand the core concept of the utility model.It should be pointed out that for the ordinary skill of the art
For personnel, without departing from the principle of this utility model, several improvements and modifications can be made to this utility model,
Modifications and modifications also fall within the protection scope of the claims of the utility model.
Claims (10)
1. the both sides of a kind of pile, including pile body (1), the pile body (1) are provided with end plate (2), two end plates (2)
Nut is locked by stretching screw (3) and compresses the pile body (1), and the locking nut and the end plate (2) is outer
Spring (4) is provided between surface, which is characterized in that the stretching screw (3) only includes for tensing the end plate (2)
The lower stretching screw (16) of the upper stretching screw (15) at edge and lower edge for tensing the end plate, and the upper tension spiral shell
Bar (15) is corresponded with the lower stretching screw (16)；
Be additionally provided with crossbeam (5) between the spring (4) and the locking nut, and each upper stretching screw (15) and with
The homonymy of its corresponding corresponding pile body of lower stretching screw (16) is set on the same crossbeam (5)；
The crossbeam (5) of homonymy is connected by connecting plate (6), and the connecting plate (6) is located at the spring (4) and the cross
Between beam (5).
2. a kind of assembly tool of pile, the assembly tool is used for pile as described in claim 1, which is characterized in that packet
Forcing press is included, lower platform pressing plate (7) is provided on the lower working face of the forcing press, the upper working face of the forcing press is provided with
Upper mounting plate pressing plate (8)；
The upper mounting plate pressing plate (8) and the lower platform pressing plate (7) with the crossbeam of respective side (5) and the connecting plate
(6) outer end face is adapted,
Abutment sleeve (9), the abutment sleeve (9) and the stretching screw are fixedly installed on the lower platform pressing plate (7)
Position is corresponding, and the internal diameter of the abutment sleeve (9) is adapted with the locking nut.
3. the assembly tool of pile as claimed in claim 2, which is characterized in that the lower working face and the lower platform pressing plate
(7) it between, is all made of the mode being detachably connected between the upper working face and the upper mounting plate pressing plate (8) and fixes.
4. the assembly tool of pile as claimed in claim 3, which is characterized in that the lower working face and the lower platform pressing plate
(7) it between, is all made of screw between the upper working face and the upper mounting plate pressing plate (8) and is fixedly connected.
5. such as the assembly tool of claim 2-4 any one of them piles, which is characterized in that on the lower platform pressing plate (7)
With presser feet (10) compatible with the corner of outer end face of the end plate (2) is both provided on the upper mounting plate pressing plate (8).
6. the assembly tool of pile as claimed in claim 5, which is characterized in that on the lower platform pressing plate (7) and it is described on
The first briquetting (11) compatible with the corresponding crossbeam (5) is also both provided on platform pressing plate (8).
7. the assembly tool of pile as claimed in claim 6, which is characterized in that on the lower platform pressing plate (7) and it is described on
The second briquetting (12) for being abutted against with the corresponding connecting plate (6) is also both provided on platform pressing plate (8).
8. the assembly tool of pile as claimed in claim 7, which is characterized in that on the lower platform pressing plate (7) and it is described on
The third briquetting (13) contour with the working face of the corresponding presser feet (10) is also both provided on platform pressing plate (8), and described
Third briquetting (13) is between two adjacent presser feets (10).
9. the assembly tool of pile as claimed in claim 8, which is characterized in that the lower platform pressing plate (7) and described flat
Platform pressing plate (8) passes through with corresponding first briquetting (11), second briquetting (12) and the third briquetting (13) respectively
Soket head cap screw is fixedly connected.
10. the assembly tool of the pile as described in any one of claim 2-4 and 6-9, which is characterized in that the lower platform pressure
The both sides of plate (7) are also both provided with handle easy to carry (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820240705.4U CN207765551U (en) | 2018-02-09 | 2018-02-09 | A kind of pile and its assembly tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820240705.4U CN207765551U (en) | 2018-02-09 | 2018-02-09 | A kind of pile and its assembly tool |
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| Publication Number | Publication Date |
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| CN207765551U true CN207765551U (en) | 2018-08-24 |
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ID=63180311
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| CN201820240705.4U Active CN207765551U (en) | 2018-02-09 | 2018-02-09 | A kind of pile and its assembly tool |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110137554A (en) * | 2018-02-09 | 2019-08-16 | 北京普能世纪科技有限公司 | A kind of pile and its assembly tool |
-
2018
- 2018-02-09 CN CN201820240705.4U patent/CN207765551U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110137554A (en) * | 2018-02-09 | 2019-08-16 | 北京普能世纪科技有限公司 | A kind of pile and its assembly tool |
| CN110137554B (en) * | 2018-02-09 | 2022-11-04 | 北京普能世纪科技有限公司 | Electric pile and assembly tool thereof |
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