CN207361736U - Contact net upkeep operation car and its workbench telescopic arm structure - Google Patents
Contact net upkeep operation car and its workbench telescopic arm structure Download PDFInfo
- Publication number
- CN207361736U CN207361736U CN201721323744.2U CN201721323744U CN207361736U CN 207361736 U CN207361736 U CN 207361736U CN 201721323744 U CN201721323744 U CN 201721323744U CN 207361736 U CN207361736 U CN 207361736U
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- workbench
- telescopic arm
- vertical
- arm
- telescopic
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Abstract
The utility model discloses a kind of contact net upkeep operation car and its workbench telescopic arm structure, workbench telescopic arm structure includes workbench, can drive horizontal extension arm that the workbench moves horizontally and the vertical telescopic arm that can drive the workbench vertical shift, further includes:Horizontal retaining mechanism, the horizontal retaining mechanism can limit the telescopic end stretching of the horizontal extension arm after the horizontal extension arm is shunk;Vertical retaining mechanism, the vertical retaining mechanism can limit the telescopic end stretching of the vertical telescopic arm after the vertical telescopic arm contraction.The structure design of the workbench telescopic arm structure can effectively prevent the situation that horizontal extension arm or vertical telescopic arm surprisingly stretch out.
Description
Technical field
The utility model is related to repair apparatus technical field, more specifically to a kind of contact net upkeep operation car and
Its workbench telescopic arm structure.
Background technology
Operation vehicle for contact wire of the prior art only has a job platform.Height of the job platform due to being subject to contact line
There is " rise not ", causes region more than contact line not reach in degree limitation, platform, for example, carrier cable, bracket, time
Streamline, high-voltage line etc., there are certain operation blind area.In practice of construction, the job content in " blind area " can only be by other special
Mode is completed, such as " chock ", " pole-climbing ", " hanger rope " etc., and operation is dangerous big, and inefficiency.
To solve the above-mentioned problems, utility model is a kind of passes through horizontal extension arm and vertical telescopic arm drives workbench to move
Dynamic contact net upkeep operation car, can so realize to the contact line range above such as carrier cable, bracket, return wire, high-voltage line
All standing.But after horizontal extension arm and vertical telescopic arm are shunk in place, frequently occur in operation vehicle for contact wire's moving process
The middle situation for horizontal extension arm or vertical telescopic arm occur and surprisingly stretching out.
In conclusion the situation for how effectively preventing horizontal extension arm or vertical telescopic arm from surprisingly stretching out, is current sheet
Field technology personnel's urgent problem.
Utility model content
In view of this, first purpose of the utility model is to provide a kind of workbench telescopic arm structure, the workbench
The structure design of telescopic arm structure can effectively prevent the situation that horizontal extension arm or vertical telescopic arm surprisingly stretch out, this practicality
Second new purpose is to provide a kind of contact net upkeep operation car including above-mentioned workbench telescopic arm structure.
In order to reach above-mentioned first purpose, the utility model provides following technical solution:
A kind of workbench telescopic arm structure, including workbench, horizontal extension that the workbench can be driven to move horizontally
Arm and the vertical telescopic arm that can drive the workbench vertical shift, further include:
Horizontal retaining mechanism, the horizontal retaining mechanism can limit the horizontal extension after the horizontal extension arm is shunk
The telescopic end of arm stretches out;
Vertical retaining mechanism, the vertical retaining mechanism can limit described vertical flexible after the vertical telescopic arm contraction
The telescopic end of arm stretches out.
Preferably, in above-mentioned workbench telescopic arm structure, the horizontal retaining mechanism includes:
With the relatively-stationary fixed seat of telescopic end of the horizontal extension arm;
One end and the shaft of fixed seat rotation connection, axis the stretching parallel to the horizontal extension arm of the shaft
Contracting direction is set;
The bar being fixedly connected with the other end of the shaft;
With the relatively-stationary block of fixing end of the horizontal extension arm, after the horizontal extension arm is shunk, the shaft
Can drive the bar turn to the bar be located at the block the remote horizontal extension arm telescopic end side.
Preferably, in above-mentioned workbench telescopic arm structure, the bar is connected with the shaft thread, and the bar phase
Distance of the bar away from the fixed seat can be adjusted when being rotated for the shaft.
Preferably, in above-mentioned workbench telescopic arm structure, the first locking nut being set on the bar, institute are further included
State the first locking nut and the bar thread fitting.
Preferably, in above-mentioned workbench telescopic arm structure, bushing, the shaft and the lining are fixed with the fixed seat
Set rotation connection;
Further include for the lubricating cup that lubricating oil is supplied between the bushing and shaft, and being provided with through hole on the bushing,
Further include the screw plug coordinated with the through hole whorl.
Preferably, in above-mentioned workbench telescopic arm structure, the vertical retaining mechanism includes:
Lower end and the relatively-stationary vertical adjusting rod of the shaft, the adjustable in length of the vertical adjusting rod;
The handle being fixedly connected with the upper end of the adjusting rod, drive the handle can drive the vertical adjusting rod and
Shaft is rotated around shaft axis jointly, and bayonet is offered on the handle;
It is equal with the relatively-stationary limited block of fixing end of the vertical telescopic arm, the vertical telescopic arm and horizontal extension arm
After contraction, the handle is driven to rotate to realize that the limited block is stuck in the bayonet and the bar is located at the block
The side of telescopic end away from the horizontal extension arm.
Preferably, in above-mentioned workbench telescopic arm structure, further include:
With the relatively-stationary spacing key seat of telescopic end of the vertical telescopic arm;
The spacer pin being arranged on the spacing key seat, drives the spacer pin to be stretched out along horizontal direction spacing to realize
Pin at the top of the handle with offseting.
Preferably, in above-mentioned workbench telescopic arm structure, gas spring is further included, its one end is consolidated with the vertical telescopic arm
Fixed arm is fixedly connected, and the other end is fixedly connected with the shaft.
Preferably, in above-mentioned workbench telescopic arm structure, the spacing pad being arranged in the fixed seat, the limit are further included
The rotational angle when direction that position pad can limit the handle to the remote limited block rotates.
A kind of contact net upkeep operation car, including the workbench telescopic arm structure as any one of above-mentioned.
The water that workbench telescopic arm structure provided by the utility model includes workbench, workbench can be driven to move horizontally
Flat telescopic arm and the vertical telescopic arm that can drive workbench vertical shift, the i.e. telescopic end of horizontal extension arm being capable of bands when flexible
Dynamic workbench moves horizontally, and the telescopic end of vertical telescopic arm can drive workbench vertical shift when flexible.Focus on, it is above-mentioned
Workbench telescopic arm structure further includes horizontal retaining mechanism and vertical retaining mechanism, wherein horizontal extension arm horizontal locking after shrinking
The telescopic end that limit levels telescopic arm is capable of in mechanism stretches out, and vertical retaining mechanism can limit after vertical telescopic arm contraction stretches vertically
The telescopic end of contracting arm stretches out.I.e. after horizontal extension arm and vertical telescopic arm are fully retracted to position, then pass through horizontal retaining mechanism
The telescopic end of limit levels telescopic arm stretches out, and the telescopic end that vertical telescopic arm is limited by vertical retaining mechanism stretches out, can with this
Effectively to prevent horizontal extension arm and vertical telescopic arm from shrinking what rear horizontal extension arm or vertical telescopic arm in place surprisingly stretched out
Situation, and then avoid security risk.
In order to reach above-mentioned second purpose, the utility model additionally provides a kind of contact net upkeep operation car, the contact
Net upkeep operation car includes any of the above-described kind of workbench telescopic arm structure.Since above-mentioned workbench telescopic arm structure is with above-mentioned
Technique effect, the contact net upkeep operation car with the workbench telescopic arm structure also should be with corresponding technique effect.
Brief description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the structure diagram for the workbench telescopic arm structure that the utility model embodiment provides;
Fig. 2 is the partial enlarged view of a-quadrant in Fig. 1.
In Fig. 1-2:
1- workbench, 2- horizontal extensions arm, 3- bars, the first locking nuts of 4-, 5- shafts, 6- screw plugs, 7- fixed seats, 8-
The spacing pad of vertical telescopic arm, 9- gas springs, the vertical adjusting rods of 10-, 11- limited blocks, 12- handles, 13- spacer pins, 14-, 15- the
The spacing key seat of two locking nuts, 16-, 17- regulation handles, 18- blocks.
Embodiment
First purpose of the utility model be to provide a kind of workbench telescopic arm structure, the workbench telescopic arm structure
Structure design can effectively prevent situation that horizontal extension arm or vertical telescopic arm surprisingly stretch out, the second of the utility model
A purpose is to provide a kind of contact net upkeep operation car including above-mentioned workbench telescopic arm structure.
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained, shall fall within the protection scope of the present invention.
In the description of the utility model, it is to be understood that term " on ", " under ", "front", "rear", " left side " and " right side "
Orientation or position relationship Deng instruction are based on orientation shown in the drawings or position relationship, are for only for ease of and describe this practicality newly
Type and simplifying describes, rather than instruction or implies that signified position or element must have particular orientation, with specific orientation structure
Into and operation, therefore the it is not intended that limitation of the utility model.In addition, term " first ", " second " are only used for description purpose,
And it is not intended that instruction or hint relative importance.
Please refer to Fig.1-Fig. 2, the workbench telescopic arm structure that the utility model embodiment provides includes workbench 1, can
Drive the horizontal extension arm 2 that workbench 1 moves horizontally and the vertical telescopic arm 8 of 1 vertical shift of workbench can be driven, i.e., it is horizontal
The telescopic end of telescopic arm 2 can drive workbench 1 to move horizontally when flexible, and the telescopic end of vertical telescopic arm 8 being capable of band when flexible
1 vertical shift of dynamic workbench.Focus on, above-mentioned 1 telescopic arm structure of workbench further includes horizontal retaining mechanism and vertical locking
Horizontal retaining mechanism is capable of the telescopic end stretching of limit levels telescopic arm 2 after mechanism, wherein horizontal extension arm 2 are shunk, and stretches vertically
Vertical retaining mechanism can limit the telescopic end stretching of vertical telescopic arm 8 after the contraction of contracting arm 8.I.e. when horizontal extension arm 2 and vertically
After telescopic arm 8 is fully retracted to position, then the telescopic end stretching by horizontal retaining mechanism limit levels telescopic arm 2, by vertical
The telescopic end that retaining mechanism limits vertical telescopic arm 8 stretches out, and horizontal extension arm 2 and vertical telescopic arm are can effectively prevent with this
The situation that horizontal extension arm 2 or vertical telescopic arm surprisingly stretch out after shrinking in place, and then avoid security risk.
Wherein, the telescopic end of horizontal extension arm 2 can be fixedly connected with the fixed arm of vertical telescopic arm 8, and workbench 1 is with erecting
The telescopic end of straight telescopic arm 8 is fixedly connected.
Preferably, horizontal retaining mechanism can specifically include fixed seat 7, shaft 5, bar 3 and block 18.Wherein, it is fixed
Seat 7 and the telescopic end of horizontal extension arm 2 are relatively fixed, and specifically, fixed seat 7 can be directly anchored to consolidating for vertical telescopic arm 8
In fixed arm.One end of shaft 5 is rotatablely connected with fixed seat 7, and the other end of shaft 5 is fixedly connected with bar 3, the axis of shaft 5
Set parallel to the telescopic direction of horizontal extension arm 2.Block 18 and the fixing end of horizontal extension arm 2 are relatively fixed, specific block
18 can be directly anchored on the fixed arm of horizontal extension arm 2, and after horizontal extension arm 2 is shunk, shaft 5 can drive 3 turns of bar
The side of the telescopic end for the remote horizontal extension arm 2 for being located at block 18 is moved to bar 3.So set, when horizontal arms is complete
After shrinking in place, drive shaft 5 rotates, and then shaft 5 drives bar 3 to rotate, and bar 3 is rotated around horizontal 5 axis of shaft,
Finally realize that bar 3 turns to the side of the telescopic end of the remote horizontal extension arm 2 of block 18 and bar 3 offsets with block 18.
At this time, if the telescopic end of horizontal extension arm 2 stretches out bar 3 can be driven to move, and block 18 can prevent bar 3 from moving, into
And the barrier effect for realizing block 18 prevents that the telescopic end of horizontal extension arm 2 from stretching out, and then realize to being fully retracted to position
The purpose that horizontal extension arm 2 afterwards locks.
Certainly, card slot can also be set on horizontal extension arm 2 in horizontal retaining mechanism, by bar 3 be stuck in card slot into
Row locking.Motor or manual actuation shaft 5 can also be utilized to rotate.
Further, bar 3 can be threadedly coupled with shaft 5, in order to the demolition and maintenance of bar 3.Wherein, 3 phase of bar
Distance of the bar 3 away from fixed seat 7 can be adjusted when being rotated for shaft 5, i.e., when bar 3 is rotated relative to shaft 5, it is possible to achieve
Bar 3 is moved axially along shaft 5, is realized the fine setting of 3 position of bar, is so easily facilitated the operation of locking or unlock.
In above-described embodiment, horizontal retaining mechanism further includes the first locking nut 4 being set on bar 3, the first locking
Nut 4 and 3 thread fitting of bar.When the first locking nut 4 and the end of shaft 5 offset, it can realize and bar 3 is determined
Position, to prevent bar 3 from being rotated relative to shaft 5.So set, after suitable position is transferred in the position of bar 3, can be passed through
One locking nut 4 positions bar 3.
Alternatively, bar 3 can also be an integral structure with shaft 5, it is not limited thereto.
In another embodiment, bushing is fixed with fixed seat 7, shaft 5 is rotatablely connected with bushing.It is real thus by bushing
The connection of existing shaft 5.Wherein, can also include be used between bushing and shaft 5 supply lubricating oil lubricating cup, with reduce bushing with
Frictional force between shaft 5.
In above-described embodiment, through hole can be provided with bushing, further includes the screw plug 6 coordinated with through hole whorl.In this way,
When oil filling is difficult, screw plug 6 can be unclamped, when not used tighten screw plug 6.
Certainly, bearing can also be set in fixed seat 7, and shaft 5 is connected with bearing inner race, and fixed seat 7 connects with bearing outer ring
Connect.
In addition, vertical retaining mechanism can specifically include vertical adjusting rod 10, handle 12 and limited block 11.Wherein, vertically
The lower end of adjusting rod 10 is relatively fixed with shaft 5, can also be directly fixedly connected with shaft 5 lower end of adjusting rod 10 vertically.It is perpendicular
The adjustable in length of straight adjusting rod 10, specific vertical adjusting rod 10 can be the screw being threadedly coupled with shaft 5, or vertically
Adjusting rod 10 is as telescopic rod.
Handle 12 is fixedly connected with the upper end of adjusting rod, and driving handle 12 can drive vertical adjusting rod 10 and shaft 5 common
Rotated with around 5 axis of shaft, and bayonet is offered on handle 12.Limited block 11 is opposite with the fixing end of vertical telescopic arm 8
Fixed, specific limited block 11 can be directly anchored on workbench 1.Vertical telescopic arm 8 and horizontal extension arm 2 are fully retracted to
Behind position, driving handle 12 is rotated to realize that the remote level that limited block 11 is stuck in bayonet and bar 3 is located at block 18 at the same time is stretched
The side of the telescopic end of contracting arm 2.Limited block 11 is stuck in bayonet so set, directly driving handle 12 and can not only realize, but also
It can realize that bar 3 is located at the side of the telescopic end of the remote horizontal extension arm 2 of block 18, while realize to vertical telescopic arm
8 and the locking of horizontal extension arm 2.During unlock, rotational handle 12 is directly opposite, makes the disengaging bayonet of limited block 11 and bar 3 is no longer
Positioned at the side of the telescopic end of the remote horizontal extension arm 2 of block 18.
In above-described embodiment, after limited block 11 is located in bayonet, the effect of limited block 11 makes the telescopic end of vertical telescopic arm 8
It cannot stretch out again.Second locking nut 15 can be set on vertical adjusting rod 10, i.e., led to when vertical adjusting rod 10 is of convenient length
Cross the second locking nut 15 to lock, the length of vertical adjusting rod 10 is locked.
Wherein, handle 12 can be specially L shapes, and bayonet is located at the vertical portion of L shapes handle 12.
After locking in order to prevent, since vibrations rotate, above-mentioned workbench telescopic arm structure can also include spacing handle 12
Key seat 16 and spacer pin 13.Wherein, the telescopic end of spacing key seat 16 and vertical telescopic arm 8 is relatively fixed, specific spacing key seat 16
It can be directly anchored on workbench 1, spacer pin 13 is arranged on spacing key seat 16, and spacer pin 13 can be in spacing key seat
Stretch on 16 along horizontal direction, driving spacer pin 13 is stretched out along horizontal direction to realize the top of spacer pin 13 and handle 12
Offset, the effect of spacer pin 13 at this time can prevent handle 12 from rotating unlock due to rocking.
The telescopic direction of spacer pin 13 can be parallel with the telescopic direction of horizontal extension arm 2.Specifically, can be in spacer pin
The regulation handle 17 being fixedly connected with spacer pin 13 is set on seat 16, offers what is passed through for regulation handle 17 on spacing key seat 16
Bar hole, driving regulation handle 17 is slided in bar hole can be achieved the flexible of spacer pin 13.
Certainly, spacer pin 13 can also move up and down, and to realize that the top with handle 12 offsets, be not limited thereto.
Similarly, unlock back handle 12 rocks in order to prevent, can also include gas spring 9, one end of gas spring 9 with vertically
The fixed arm of telescopic arm 8 is fixedly connected, and the other end is fixedly connected with shaft.
12 rotational angle of handle is excessive when unlocking in order to prevent, can also include the spacing pad 14 being arranged in fixed seat 7,
The rotational angle when direction that spacing pad 14 can limit handle 12 to remote limited block 11 rotates.In this way, handle 12 only can be with
Directly rotated in spacing pad 14 and limited block 11.
Based on the workbench telescopic arm structure provided in above-described embodiment, the utility model additionally provides a kind of contact net inspection
Operation Van is repaiied, which includes any one workbench telescopic arm structure in above-described embodiment.Since this connects
Net-fault upkeep operation car employs the workbench telescopic arm structure in above-described embodiment, so the contact net upkeep operation car has
Beneficial effect refer to above-described embodiment.
Above-mentioned contact net upkeep operation car can include three workbench telescopic arm structures, so can more people's multiple spots make at the same time
Industry, can carry out contact net clue, suspension parts, insulator, return wire etc. comprehensive maintenance and maintenance, greatly improve operation effect
Rate, reduce cost, ensures repair quality.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or new using this practicality
Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide scope consistent with features of novelty.
Claims (10)
1. a kind of workbench telescopic arm structure, including workbench (1), level that the workbench (1) can be driven to move horizontally
Telescopic arm (2) and the vertical telescopic arm (8) that the workbench (1) vertical shift can be driven, it is characterised in that further include:
Horizontal retaining mechanism, the horizontal retaining mechanism can limit the horizontal extension after the horizontal extension arm (2) is shunk
The telescopic end of arm (2) stretches out;
Vertical retaining mechanism, the vertical retaining mechanism can limit described vertical flexible after vertical telescopic arm (8) contraction
The telescopic end of arm (8) stretches out.
2. workbench telescopic arm structure according to claim 1, it is characterised in that the horizontal retaining mechanism includes:
With the relatively-stationary fixed seat of telescopic end (7) of the horizontal extension arm (2);
One end and the shaft (5) of the fixed seat (7) rotation connection, the axis of the shaft (5) is parallel to the horizontal extension
The telescopic direction of arm (2) is set;
The bar (3) being fixedly connected with the other end of the shaft (5);
With the relatively-stationary block of fixing end (18) of the horizontal extension arm (2), after the horizontal extension arm (2) is shunk, institute
State shaft (5) bar (3) can be driven to turn to the bar (3) and be located at the remote level of the block (18) and stretch
The side of the telescopic end of contracting arm (2).
3. workbench telescopic arm structure according to claim 2, it is characterised in that the bar (3) and the shaft (5)
It is threadedly coupled, and when bar (3) is rotated relative to the shaft (5) can adjust the bar (3) away from the fixed seat
(7) distance.
4. workbench telescopic arm structure according to claim 3, it is characterised in that further include and be set in the bar (3)
On the first locking nut (4), first locking nut (4) and the bar (3) thread fitting.
5. workbench telescopic arm structure according to claim 2, it is characterised in that be fixed with lining on the fixed seat (7)
Set, the shaft (5) are rotatablely connected with the bushing;
The lubricating cup being used between the bushing and shaft (5) for lubricating oil is further included, and through hole is provided with the bushing, also
Including the screw plug (6) coordinated with the through hole whorl.
6. workbench telescopic arm structure according to claim 2, it is characterised in that the vertical retaining mechanism includes:
Lower end and the relatively-stationary vertical adjusting rod (10) of the shaft (5), the adjustable in length of the vertical adjusting rod (10);
The handle (12) being fixedly connected with the upper end of the adjusting rod, drives the handle (12) to drive the vertical adjusting
Bar (10) and shaft (5) are rotated around shaft (5) axis jointly, and bayonet is offered on the handle (12);
With the relatively-stationary limited block of fixing end (11) of the vertical telescopic arm (8), the vertical telescopic arm (8) and level are stretched
After contracting arm (2) is shunk, the handle (12) is driven to rotate to realize that it is in the bayonet and described that the limited block (11) is stuck in
Bar (3) is located at the side of the telescopic end of the remote horizontal extension arm (2) of the block (18).
7. workbench telescopic arm structure according to claim 6, it is characterised in that further include:
With the relatively-stationary spacing key seat (16) of telescopic end of the vertical telescopic arm (8);
The spacer pin (13) being arranged on the spacing key seat (16), drive the spacer pin (13) along horizontal direction stretch out with
Realize spacer pin (13) with offseting at the top of the handle (12).
8. workbench telescopic arm structure according to claim 6, it is characterised in that further include gas spring (9), its one end with
The fixed arm of the vertical telescopic arm (8) is fixedly connected, and the other end is fixedly connected with the shaft.
9. workbench telescopic arm structure according to claim 6, it is characterised in that further include and be arranged at the fixed seat
(7) the spacing pad (14) on, the spacing pad (14) can limit the handle (12) to the side away from the limited block (11)
To rotational angle when rotating.
10. a kind of contact net upkeep operation car, it is characterised in that including workbench as claimed in any one of claims 1-9 wherein
Telescopic arm structure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201721323744.2U CN207361736U (en) | 2017-10-13 | 2017-10-13 | Contact net upkeep operation car and its workbench telescopic arm structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN201721323744.2U CN207361736U (en) | 2017-10-13 | 2017-10-13 | Contact net upkeep operation car and its workbench telescopic arm structure |
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Publication Number | Publication Date |
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CN207361736U true CN207361736U (en) | 2018-05-15 |
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ID=62348229
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CN201721323744.2U Withdrawn - After Issue CN207361736U (en) | 2017-10-13 | 2017-10-13 | Contact net upkeep operation car and its workbench telescopic arm structure |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107500212A (en) * | 2017-10-13 | 2017-12-22 | 北京中车重工机械有限公司 | Contact net upkeep operation car and its workbench telescopic arm structure |
-
2017
- 2017-10-13 CN CN201721323744.2U patent/CN207361736U/en not_active Withdrawn - After Issue
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107500212A (en) * | 2017-10-13 | 2017-12-22 | 北京中车重工机械有限公司 | Contact net upkeep operation car and its workbench telescopic arm structure |
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