CN107905255A - The automatic connecting node of underground engineering assembled bow member and mechanized construction method - Google Patents
The automatic connecting node of underground engineering assembled bow member and mechanized construction method Download PDFInfo
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- CN107905255A CN107905255A CN201711174663.5A CN201711174663A CN107905255A CN 107905255 A CN107905255 A CN 107905255A CN 201711174663 A CN201711174663 A CN 201711174663A CN 107905255 A CN107905255 A CN 107905255A
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- 238000010276 construction Methods 0.000 title claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 238000009434 installation Methods 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 241001136800 Anas acuta Species 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 210000000080 chela (arthropods) Anatomy 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 210000003128 head Anatomy 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
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Abstract
The invention discloses a kind of automatic connecting node of underground engineering assembled bow member and mechanized construction method, including assembled attachment device and guiding pressure-bearing attachment device in two adjacent sections bow member is respectively welded, assembled attachment device and guiding pressure-bearing attachment device are attached by axis pin rotating mechanism.Three row's through holes are set inside connecting plate, guide extension device is configured in hole, by internal restoring spring, power transmission pin front end is stretched out outside hole.Be oriented to pressure-bearing attachment device around pin framework rotate when, guide plate extrudes power transmission pin, restoring spring compresses, after fixed connecting plate and connecting plate are bonded, power transmission pin is ejected and engaged with guide plate pin shaft hole, node locking is linked together, finally by bolt connecting mechanism, improves node strength and stability.Node structure of the present invention is simple, its relatively low processing technology of processing cost is simple, welded and installed fast and easy, and applied widely.
Description
Technical field
The present invention relates to a kind of automatic connecting node of underground engineering assembled bow member and mechanized construction method.
Background technology
Since the 21th century, with the continuous development in city and being continuously increased for population, land transportation is increasingly crowded, hair
Exhibition underground engineering has become very urgent.In recent years, China's underground engineering construction is quickly grown, and it is highly visible to achieve some
Achievement, occupies world's underground engineering construction scale and construction speed big country forefront.Due to China's underground engineering construction scale and
Speed of application is grown rapidly, its construction efficiency and safety problem etc. is also required more and more stringenter.At present, China's underground engineering
Supporting generally uses steel arch-shelf, and traditional live manually installed mode, installation process are still used when carrying out supporting operation
Middle to need a large amount of workers prolonged high intensity construction operation of non-support space progress at the scene, its security and construction efficiency are got over
Raise difficult questions to meet the construction requirement under current underground engineering fast development, limit the further development of underground engineering construction, therefore
The motorization assembly of bow member becomes the inexorable trend of underground engineering support construction technology development.It is traditional under this background condition
Bow member node connection mode needs to be correspondingly improved to coordinate the mechanized construction of live bow member.
Traditional bow member connection mode is primarily present following deficiency：
(1) construction worker's quantity is more needed for, and labor intensity is big.Traditional bow member connection method can not coordinate carry out mechanization
Construction, therefore when carrying out in-site installation, it is necessary to a large amount of worker's coordinative constructions.
(2) long construction period, speed are slow, and security is low.In bow member connection procedure, worker need to be grown in non-support space
The construction of time, security are difficult to ensure that, and traditional bow member connection method is time-consuming and laborious, construction speed is seriously lagged.
The content of the invention
The present invention is to solve the above-mentioned problems, it is proposed that a kind of automatic connecting node of underground engineering assembled bow member and machinery
Change construction method, the present invention can effectively coordinate bow member motorization assembly to construct, and largely improve speed of application, shorten
Construction period has simultaneously ensured worker's working security.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of automatic connecting node of underground engineering assembled bow member proposed by the present invention, including be respectively welded in two adjacent sections
The guiding pressure-bearing attachment device and assembled attachment device of bow member, the guiding pressure-bearing attachment device is by fixed connecting plate and guiding
Plate forms, and the fixed connecting plate is used to connect a single-unit bow member, and the guide plate is welded in the both sides of fixed connecting plate；
Form a groove profile shape structure；The assembled attachment device is made of guide extension device and connecting plate, and the connecting plate is used
In connecting another single-unit bow member, its inside sets three row's through holes；The connecting plate passes through rotating member and the fixation
Connecting plate is connected；0~360 ° of the rotation angle of the rotating member；The described guide extension device connection connecting plate with
Guide plate.
Further, the connecting plate is equipped with least two through holes, is respectively guide extension when setting three
Device installation through-hole, be bolted through hole, axis pin rotating through hole.
Further, the guide plate upper end is the skew back sliding surface in arc-shaped, and is opened up and connecting plate in guide plate
The corresponding through hole of three exhausting holes.
Further, the guide extension device includes two power transmission pins, a locating part and restoring spring, two power transmissions
The pin head segment of pin is hemispherical, and main body is that columned structure pin tail is the cup dolly that diameter is more than pin head segment, two
Spring eye is equipped with a cup dolly；The locating part is fixed therein the front end of a power transmission pin, plays fixing force transfer pin,
The restoring spring both ends are separately fixed in the spring eye of two power transmission pins.
Further, the spring eye is opened in both sides power transmission pin cup dolly bottom face middle part respectively, described
Spring eye top is cone, and main body is cylinder.
Further, guide extension device makes power transmission pin front end stretch out outside hole, the guiding is held by internal restoring spring
Pressure attachment device around axis pin rotates when, guide plate extruding power transmission pin, restoring spring compression, when fixed connecting plate and connecting plate fitting
Afterwards, power transmission plunger is ejected and latched in guide plate through hole, and node locking is linked together.
When through hole is more than three, one or more is arranged to be bolted through hole, is being bolted
Configuration bolt connecting mechanism is to improve node stability and bow member ultimate strength in through hole, and the bolt connecting mechanism is by high-strength spiral shell
Bolt is formed with nut.
Preferably, can between connecting plate and fixed connecting plate configuration node intensifying device, i.e., in three row's through hole of connecting plate
Between and fixed connecting plate opposite position at open up bolt hole, high-strength bolt and nut are installed.
The invention also provides have a kind of bow member for including attachment device noted earlier.
It is as follows using the automatic connecting node mechanized construction method of assembled bow member, step：
(1) bow member examination is assembled：According to shelf's design on arch bridge contour line, each section bow member is subjected to examination assembly in ground grading, will be saved
Point is respectively welded on two adjacent sections bow member, and each section bow member is formed entirety by connecting axis pin.
(2) bow member folds：By node caliper arrangement, assembling type node can be opened, according to bow member folded form, utilizes machine
The lifting of tool hand is rotated around Activity On the Node axis pin, is folded to shelf's design on arch bridge form.
The node clamp are made of plier, the pincers cheek and handle three parts, and plier inwardly stretches out, and main body is cylindric, head
Portion is hemispherical, and diameter is identical with power transmission plunger diameter.Node not damaged opening is can be not only used for, also solves the problem that node is oriented to and stretches
Compression apparatus is unable to the problem of normal use.
(3) bow member mechanization is installed：When bow member is installed, it is lifted to using bow member among manipulator snatch and requires position and consolidate
Fixed motionless, auxiliary manipulator coordinates expansion both sides bow member, and bow member node automatic fastening is in place.
(4) bolt connecting device is installed：Bow member operates trolley or artificial trolley after installation is complete, by bow member personnel and will save
The bolt connecting mechanism of point is attached fixation, improves assembling type node intensity and long-time stability, ensures construction safety.
Advantages of the present invention is：
(1) node structure is simple, its relatively low processing technology of processing cost is simple, welded and installed fast and easy, and the present invention
In attachment device be mostly active pin shaft and node connecting plate, assembling is flexible；
(2) method for substituting in the past traditional manpower installation connection, is assembled by bow member mechanized construction, high degree
Labor intensity is reduced, reduces site operation personnel amount, and machinery instead of worker and operation carried out in non-support space,
Improve the security of construction；
(3) node engaging fast and easy, accelerates speed of application, using the attachment device, can effectively improve live bow member
Assembled speed is connected, shortens construction period, reduces construction cost.
(4) it is applied widely.The nodal connection device is not only suitable for new confined concrete bow member, is also applied for routine
I-steel, H profile steel etc..
(5) different joint forms are applied for different surrounding rock strength grade, it is alternative more, and every kind of joint form is all
Maximum capacity can be played under various wall rock conditions, improves engineering total quality.
Brief description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are used to explain the application, do not form the improper restriction to the application.
Fig. 1 (a) is assembling type node Automatic Link Establishment (non-bolted joint) schematic diagram；
Fig. 1 (b) (is bolted) schematic diagram for assembling type node Automatic Link Establishment
Fig. 2 (a), 2 (b) are preferred fit formula joint form top view and side view
Fig. 3 (a), Fig. 3 (b) are guiding pressure-bearing attachment device main view and side view；
Fig. 4 (a), Fig. 4 (b) are assembled attachment device (non-bolted joint) main view and top view；
Fig. 5 (a), Fig. 5 (b) (are bolted) main view and top view for assembled attachment device；
Fig. 6 is rotating pin structure diagram；
Fig. 7 is guide extension apparatus structure schematic diagram；
Fig. 8 (a), Fig. 8 (b) are bolt connecting mechanism schematic diagram；
Fig. 9 is node clamp schematic diagram.
Wherein, 1- fixed connecting plates, 2- connecting plates, 3- axis pin rotating mechanisms, 4- bow members, 5- guide plates, 6- guide extensions
Device, 7- power transmission pins, 8- stop nuts, 9- restoring springs, 10- spring eyes, 11- lateral slidings face, 12- through holes, 13- bayonet locks
Hole, 14- rotating pins, 15- thread segments, 16- telescopic spring sections, 17- plunger sections, 18- node intensifying devices, 19- are bolted
Mechanism, 20- guide extension device installation through-holes, 21- are bolted through hole, 22- axis pin rotating through hole, 23- high-strength bolts, 24-
High-strength nut, 25- assembled attachment devices, 26- guiding pressure-bearing attachment devices, 27- node clamp, 28- pliers, the 29- pincers cheeks,
30- handles.
Embodiment
It is noted that described further below is all illustrative, it is intended to provides further instruction to the application.It is unless another
Indicate, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
As background technology is introduced, traditional bow member connection mode is primarily present following deficiency：
(1) construction worker's quantity is more needed for, and labor intensity is big.Traditional bow member connection method can not coordinate carry out mechanization
Construction, therefore when carrying out in-site installation, it is necessary to a large amount of worker's coordinative constructions.
(2) long construction period, speed are slow, and security is low.In bow member connection procedure, worker need to be grown in non-support space
The construction of time, security are difficult to ensure that, and traditional bow member connection method is time-consuming and laborious, construction speed is seriously lagged, in order to
Technical problem as above is solved, present applicant proposes a kind of automatic connecting node of underground engineering assembled bow member and mechanized construction
Method.
In a kind of typical embodiment of the application, as shown in Fig. 1 (a), Fig. 1 (b), Fig. 2 (a), Fig. 2 (b), a kind of ground
The automatic connecting node of lower engineering assembled bow member, it is characterised in that：Including the guiding pressure-bearing in two adjacent sections bow member is respectively welded
Attachment device 26 and assembled attachment device 25, the assembled attachment device and guiding pressure-bearing attachment device are rotated by axis pin
Mechanism 3 is attached.；
As shown in Fig. 3 (a), Fig. 3 (b), the guiding pressure-bearing attachment device 26 is made of fixed connecting plate 1 and guide plate 5,
Guide plate 5 is welded in the both sides of fixed connecting plate；The fixed connecting plate 1 is used to connect a single-unit bow member, the guiding
Plate 5 is welded in the both sides of fixed connecting plate 1；Form a groove profile shape structure；5 upper end of guide plate is to be slided in the skew back of arc-shaped
Face 11, and opened up and the corresponding through hole 12 of three exhausting hole of connecting plate in guide plate.
As shown in Fig. 4 (a), Fig. 4 (b), the assembled attachment device 25 is made of guide extension device 6 and connecting plate 2,
Three row's through holes are set inside the connecting plate；The connecting plate is used to connect another single-unit bow member, three rows of its internal setting
Through hole；The three rows connecting plate through hole is respectively guide extension device installation through-hole 20, is bolted through hole 21, axis pin rotation
Turn through hole 22.The connecting plate is connected by rotating pin with the fixed connecting plate；The rotation of the rotating pin
0~360 ° of angle；The guide extension device connection connecting plate and guide plate.The axis pin rotating mechanism 3 is by leading
Collectively formed to plate 5, rotating pin 14 and connecting plate 2；The guide plate and connecting plate are rotated around rotary pin shaft, rotation angle 0
~360 °.
As shown in fig. 7, the guide extension device 6 includes two power transmission pins, 7, stop nuts 8 and a playback bullet
Spring 9, the upper end of each power transmission pin 7 is hemispherical, the structure of body cylindrical shape, and rear end is more than the circle of plunger section for diameter
Base, the stop nut 8 are fixed therein the head of a power transmission pin, play fixing force transfer pin.
The restoring spring 9 of the guide extension device 6 is positioned in spring eye 10, and the spring eye is opened in two respectively
Power transmission pin cup dolly bottom face middle part, it is cone to open up spring eye top, and main body is cylinder.
Further, guide extension device 6 makes 7 front end of power transmission pin stretch out outside hole by internal restoring spring 9, described to lead
To pressure-bearing attachment device 26 around axis pin rotate when, guide plate 5 extrude power transmission pin, restoring spring compression, when fixed connecting plate 1 and even
After fishplate bar 2 is bonded, power transmission plunger is ejected and latched in guide plate through hole 12, and node locking is linked together.
Described be bolted in through hole 21 configures bolt connecting mechanism 19 to improve node stability and bow member ultimate strength,
Shown in the bolt connecting mechanism such as Fig. 8 (a), Fig. 8 (b), it is made of high-strength bolt 23 and nut 24.
Preferably, can between connecting plate 2 and fixed connecting plate 1 configuration node intensifying device 18, i.e., passed through in three row of connecting plate
Bolt hole is opened up between through hole and at fixed connecting plate opposite position, high-strength bolt and nut are installed.
The invention also discloses a kind of bow member of the Automatic Link Establishment equipped with above-mentioned assembled connecting node, bow member includes
Multi-segmental, is connected by Automatic Link Establishment between adjacent segment.
The invention also discloses the automatic connecting node mechanized construction method of underground engineering assembled bow member, including following step
Suddenly：
(1) bow member examination is assembled：According to shelf's design on arch bridge contour line, each section bow member is subjected to examination assembly in ground grading, will be saved
Point is respectively welded on two adjacent sections bow member, and each section bow member is formed entirety by connecting axis pin.
(2) bow member folds：By node caliper arrangement, assembling type node can be opened, according to bow member folded form, utilizes machine
The lifting of tool hand is rotated around Activity On the Node axis pin, is folded to shelf's design on arch bridge form.
As shown in figure 9, the node clamp 27 are made of plier 28, the pincers cheek 29 and 30 three parts of handle, plier 28 is inside
Stretch out, main body is cylindric, and head is hemispherical, and 7 diameters of diameter and power transmission pin are identical.Node not damaged is can be not only used for beat
Open, also solve the problem that node guide extension device 6 is unable to the problem of normal use.
(3) bow member mechanization is installed：When bow member is installed, it is lifted to using bow member among manipulator snatch and requires position and consolidate
Fixed motionless, auxiliary manipulator coordinates expansion both sides bow member, and bow member node automatic fastening is in place.
(4) bolt connecting device is installed：Bow member operates trolley or artificial trolley after installation is complete, by bow member personnel and will save
Point bolt device is attached fixation, improves assembling type node intensity and long-time stability, ensures construction safety.
The foregoing is merely the preferred embodiment of the application, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of automatic connecting node of underground engineering assembled bow member, it is characterised in that encircle including being respectively welded in two adjacent sections
The guiding pressure-bearing attachment device and assembled attachment device of frame, the guiding pressure-bearing attachment device is by fixed connecting plate and guide plate
Composition, the fixed connecting plate are used to connect a single-unit bow member, and the guide plate is welded in the both sides of fixed connecting plate, shape
Into a groove profile shape structure；The assembled attachment device is made of guide extension device and connecting plate, and the connecting plate is used for
Connect another single-unit bow member；The connecting plate is connected by rotating member with the fixed connecting plate；The guiding is stretched
Compression apparatus the connection connecting plate and guide plate.
2. the automatic connecting node of underground engineering assembled bow member as claimed in claim 1, it is characterised in that the connecting plate
It is equipped with least two through holes.
3. such as the automatic connecting node of claim 2 underground engineering assembled bow member, it is characterised in that the guide plate upper end be in
The skew back sliding surface of arc-shaped, and opened up and the corresponding through hole of connecting plate through hole in guide plate.
4. such as the automatic connecting node of claim 2 underground engineering assembled bow member, it is characterised in that the guide extension device bag
Two power transmission pins, a locating part and a restoring spring are included, the pin head segment of two power transmission pins is hemispherical, and main body is cylinder
The structure pin tail of shape is more than the cup dolly of pin head segment for diameter, and spring eye is equipped with two cup dollies；It is described spacing
Part is fixed therein the front end of a power transmission pin, plays fixing force transfer pin, and the restoring spring both ends are separately fixed at two
In the spring eye of a power transmission pin.
5. such as the automatic connecting node of claim 4 underground engineering assembled bow member, it is characterised in that the spring eye opens up respectively
In both sides power transmission pin cup dolly bottom face middle part, the spring eye top is cone, and main body is cylinder.
6. such as the automatic connecting node of claim 4 underground engineering assembled bow member, it is characterised in that guide extension device passes through interior
Portion's restoring spring, make power transmission pin front end stretch out hole outside, it is described guiding pressure-bearing attachment device around axis pin rotates when, guide plate extruding biography
Power pin, restoring spring compression, after fixed connecting plate and connecting plate fitting, power transmission plunger ejects and latches in guide plate through hole
It is interior, node locking is linked together.
7. such as the automatic connecting node of claim 2 underground engineering assembled bow member, it is characterised in that when through hole is more than three
When, one or more is arranged to be bolted through hole, bolt connecting mechanism is configured to carry being bolted in through hole
High node stability and bow member ultimate strength, the bolt connecting mechanism are made of high-strength bolt and nut.
8. such as the automatic connecting node of claim 2 underground engineering assembled bow member, it is characterised in that in the connecting plate and admittedly
Determine configuration node intensifying device between connecting plate, i.e., open up bolt between connecting plate through hole and at fixed connecting plate opposite position
Hole, installs high-strength bolt and nut.
9. a kind of bow member, including multiple segments, it is characterised in that any described by claim 1-8 between adjacent segment
It is connected with formula node Automatic Link Establishment.
10. utilize the automatic connecting node mechanized construction method of assembled bow member described in claim 1-8, it is characterised in that
Step is as follows：
(1) bow member examination is assembled：According to shelf's design on arch bridge contour line, each section bow member is subjected to examination assembly in ground grading, by assembled
Node Automatic Link Establishment is respectively welded on two adjacent sections bow member, and each section bow member is formed entirety by connecting axis pin；
(2) bow member folds：By node caliper arrangement, assembling type node can be opened, according to bow member folded form, utilizes manipulator
Lifting is rotated around Activity On the Node axis pin, is folded to shelf's design on arch bridge form；
(3) bow member mechanization is installed：When bow member is installed, it is lifted to using bow member among manipulator snatch and requires position and fix not
Dynamic, auxiliary manipulator coordinates expansion both sides bow member, and bow member node automatic fastening is in place；
(4) bolt connecting device is installed：Bow member operates trolley or artificial trolley by node after installation is complete, by bow member personnel
Bolt connecting mechanism is attached fixation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711174663.5A CN107905255A (en) | 2017-11-22 | 2017-11-22 | The automatic connecting node of underground engineering assembled bow member and mechanized construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711174663.5A CN107905255A (en) | 2017-11-22 | 2017-11-22 | The automatic connecting node of underground engineering assembled bow member and mechanized construction method |
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| Publication Number | Publication Date |
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| CN107905255A true CN107905255A (en) | 2018-04-13 |
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ID=61847295
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711174663.5A Pending CN107905255A (en) | 2017-11-22 | 2017-11-22 | The automatic connecting node of underground engineering assembled bow member and mechanized construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007578A (en) * | 2019-12-06 | 2020-04-14 | 山东滨莱高速公路有限公司 | Comprehensive detection method and system for roadbed karst and goaf |
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| CN103615454A (en) * | 2013-12-16 | 2014-03-05 | 上海昭程整流子科技有限公司 | Elastic deformation locating pin |
| CN106096211A (en) * | 2016-07-08 | 2016-11-09 | 山东大学 | A kind of underground engineering confined concrete support system method for designing |
| CN106759374A (en) * | 2016-11-23 | 2017-05-31 | 山东大学 | Assembled underground engineering support bow member node Automatic Link Establishment and construction method |
| CN207582499U (en) * | 2017-11-22 | 2018-07-06 | 山东大学 | The automatic connecting node of underground engineering assembled arch |
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2017
- 2017-11-22 CN CN201711174663.5A patent/CN107905255A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2258809Y (en) * | 1996-07-12 | 1997-08-06 | 张平 | Universal electric tool |
| JP2007231993A (en) * | 2006-02-28 | 2007-09-13 | Nsk Ltd | Telescopic shaft |
| CN203122296U (en) * | 2013-03-22 | 2013-08-14 | 余姚市汇丰电器有限公司 | Telescopic suction pipe of dust collector |
| CN103615454A (en) * | 2013-12-16 | 2014-03-05 | 上海昭程整流子科技有限公司 | Elastic deformation locating pin |
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