CN105673024A - Oil cylinder-free telescopic mechanism for jet device and precutting trough jet device - Google Patents
Oil cylinder-free telescopic mechanism for jet device and precutting trough jet device Download PDFInfo
- Publication number
- CN105673024A CN105673024A CN201610200902.9A CN201610200902A CN105673024A CN 105673024 A CN105673024 A CN 105673024A CN 201610200902 A CN201610200902 A CN 201610200902A CN 105673024 A CN105673024 A CN 105673024A
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- Prior art keywords
- telescopic arm
- arm body
- reverse wheel
- telescoping mechanism
- free bearing
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- Pending
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- 230000007246 mechanism Effects 0.000 title claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 230000004888 barrier function Effects 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 239000004567 concrete Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 239000011378 shotcrete Substances 0.000 claims description 2
- 238000004804 winding Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention provides an oil cylinder-free telescopic mechanism for a jet device. The telescopic mechanism comprises a base arm, a middle telescopic arm and an internal telescopic arm which are radially arranged from outside to inside, wherein a third reverse wheel is fixed at the axial front end of the base arm body; a second winding drum member winds a fourth chain rope so that the middle telescopic arm makes stretching movement relative to the base arm; a first winding drum member winds a third chain rope so that the middle telescopic arm makes retraction movement relative to the base arm; a first reverse wheel and a second reverse wheel are fixed at the axial front end and tail end of a middle telescopic arm body respectively; and due to the special connection between the two reverse wheels and the first and second chain ropes, the internal telescopic arm and the middle telescopic arm stretch and retract synchronously along with the stretching and retraction of the telescopic arm. In the invention, due to the structures of a guide slot and a slider, the problems of radial sliding and circumferential rotation between arms during the movement of the telescopic mechanism are solved, and linear movement can be completely kept during the telescopic movement of the arm.
Description
Technical field
The present invention relates to engineering machinery field, be specifically related to a kind of injection apparatus without oil cylinder telescoping mechanism and precutting trough injection apparatus.
Background technology
Precutting trough technology refers to before tunnel excavation, and use equipment cuts out together narrow slot continuously penetration concrete in tunnel cross-section outer, forms a housing playing pre support effect, has excavated the technology of pre support effect to subsequent tunnel. Such as a kind of center shaft type precutting trough equipment disclosed in patent 201210069001.2, it includes walking mechanism, central shaft device, frame support, forward and backward column, topping machanism, filling system, electrical system and hydraulic system; Central shaft device includes sleeve and the rotating shaft being located in sleeve, and sleeve is fixed in described walking mechanism, and described frame supports the front and back being located at sleeve, and forward and backward column is respectively provided at rotating shaft front and back end and is hinged with bearing; Described topping machanism includes chain knife assembly and cutter beam, is provided with the second telescoping mechanism between chain knife assembly and cutter beam, and described filling system 2 is connected on chain cutter, and cutter beam coordinates with bearing sliding, is provided with the 3rd telescoping mechanism between cutter beam and bearing; Described frame supports and includes column and be located at the base plate under column, is provided with the 4th telescoping mechanism between column and base plate.
Injection apparatus (filling system) is the mechanism realizing filling concrete, in precutting trough equipment, being in contraction state under injection apparatus off working state, be elongated to certain distance during work as required, telescoping mechanism is to ensure that the critical component that concrete success irrigates. Prior art all uses oil cylinder as the source of flexible power in telescoping mechanism so that telescoping mechanism needs, with the steel plate of high intensity, to increase cost, also make telescoping mechanism weight bigger.
Therefore, this area needs the injection apparatus multi-stage expansion mechanism that a kind of simple in construction, compact dimensions, good stability and weight are suitable.
Summary of the invention
Therefore, the present invention provides a kind of injection apparatus without oil cylinder telescoping mechanism, including the basic arm, middle telescopic arm and the interior telescopic arm that radially arrange from outside to inside, the axial forward end of basic arm body is fixedly installed the 3rd reverse wheel, be connected with volume Two barrier part through the 4th chain rope one end of the 3rd reverse wheel commutation, the other end is connected with being fixedly connected on middle telescopic arm body shaft free bearing E caudad, and the 4th chain rope is furled and middle telescopic arm done relative to basic arm stretch out motion by volume Two barrier part;3rd chain rope one end is connected with first volume barrier part, the other end is caudad connected with middle telescopic arm body shaft, and the 3rd chain rope retracting is made middle telescopic arm do contractile motion relative to basic arm by first volume barrier part; The axial forward end of middle telescopic arm body and tail end are fixedly installed the first reverse wheel and the second reverse wheel respectively, through the first reverse wheel commutation first chain rope one end be fixedly connected on that basic arm body shaft free bearing A caudad is connected, the other end is connected with being fixedly connected on interior telescopic arm body shaft free bearing B caudad so that when stretching out with telescopic arm, interior telescopic arm and middle telescopic arm Tong Bu stretch out; Be connected with the free bearing C being fixedly connected on basic arm body shaft forward end through second chain rope one end of the second reverse wheel commutation, the other end is connected with the free bearing D being fixedly connected on interior telescopic arm body shaft forward end so that interior telescopic arm and middle telescopic arm synchronous when shrinking with telescopic arm.
Skilled artisans will appreciate that, described " when stretching out with oil cylinder interior telescopic arm 3 and middle telescopic arm 2 Tong Bu stretch out " is meant to the speed of central telescopic arm 2 relatively basic arm 1 when being v, the speed of the relatively middle telescopic arm 2 of interior telescopic arm 3 is similarly v, and in now, the speed of the relatively basic arm 1 of telescopic arm 3 is 2v.
In a kind of specific embodiment, described free bearing A12, the second reverse wheel 22, free bearing B32, free bearing C11, the first reverse wheel 21 and free bearing D31 set gradually in the axial direction from tail end to front end. In a kind of detailed description of the invention, described Spool piece is elevator.
In a kind of specific embodiment, described interior telescopic arm 3 is arranged on the radial outside for carrying the Material pipeline with gunite concrete.
In a kind of specific embodiment, basic arm body 10 radially inner side has the first gathering sill 14, and have the first slide block 24 at middle telescopic arm body 20 radial outside so that the first slide block slide anteroposterior vertically in the first gathering sill during the motion of middle telescopic arm relatively basic arm.
In a kind of specific embodiment, middle telescopic arm body 20 radially inner side has the second gathering sill 25, interior telescopic arm body 30 radial outside has the second slide block 33 so that interior telescopic arm relatively in telescopic arm motion time the second slide block slide anteroposterior vertically in the second gathering sill.
In a kind of specific embodiment, middle telescopic arm body 20 is internal is provided with the dividing plate 26 separated by its inner chamber.
In a kind of specific embodiment, described reverse wheel is pulley, and corresponding described chain rope is steel wire rope. Or described reverse wheel is sprocket wheel, corresponding described chain rope is chain.
The present invention also provides for a kind of precutting trough injection apparatus, including telescoping mechanism described above, is arranged on the Material pipeline of interior telescopic arm body 30 radially inner side and is connected to the pipe-reeling device of Material pipeline length one end.
The present invention first pass through the combination of elevator, pulley and chain rope solve make when being not provided with oil cylinder in the problem of telescopic arm 2 and interior telescopic arm 3 synchronization telescope. Secondly, the present invention, by the setting of rational guider, solves the problem that accurately leads of the telescopic arm body including " injection for concrete conveyance is managed ". Each functional component is separated by the present invention also by arranging dividing plate so that interference-free between device, the reliability of device is higher.
Accompanying drawing explanation
Fig. 1 is the structural representation that illustrated telescoping mechanism is axial,
Fig. 2 is illustrated telescoping mechanism structural representation radially;
Wherein, basic arm 1, middle telescopic arm 2, interior telescopic arm the 3, first chain rope the 4, second chain rope the 5, the 3rd chain rope the 6, the 4th chain rope 7, first volume barrier part, 9, volume Two barrier part, basic arm body 10, free bearing C11, free bearing A12, the 3rd reverse wheel the 13, first gathering sill 14, middle telescopic arm body the 20, first reverse wheel the 21, second reverse wheel 22, free bearing E23, first slide block the 24, second gathering sill 25, dividing plate 26, interior telescopic arm body 30, free bearing D31, free bearing B32, the second slide block 33.
Detailed description of the invention
The present invention provides a kind of injection apparatus without oil cylinder telescoping mechanism, including the basic arm 1, middle telescopic arm 2 and the interior telescopic arm 3 that radially arrange from outside to inside, the axial forward end of basic arm body 10 is fixedly installed the 3rd reverse wheel 13, be connected with volume Two barrier part 9 through the 4th chain rope 7 one end of the 3rd reverse wheel 13 commutation, the other end is connected with the free bearing E23 being fixedly connected on the middle axial tail end of telescopic arm body 20, and the 4th chain rope 7 is furled and middle telescopic arm 2 done relative to basic arm 1 stretch out motion by volume Two barrier part 9; 3rd chain rope 6 one end is connected with first volume barrier part 8, the other end is connected with the middle axial tail end of telescopic arm body 20, and the 3rd chain rope 6 retracting is made middle telescopic arm 2 do contractile motion relative to basic arm 1 by first volume barrier part 8; The axial forward end of middle telescopic arm body 20 and tail end are fixedly installed the first reverse wheel 21 and the second reverse wheel 22 respectively, be connected with the free bearing A12 being fixedly connected on the axial tail end of basic arm body 10 through first chain rope 4 one end of the first reverse wheel 21 commutation, the other end is connected with the free bearing B32 being fixedly connected on the interior axial tail end of telescopic arm body 30 so that when stretching out with telescopic arm, interior telescopic arm 3 and middle telescopic arm 2 Tong Bu stretch out; Be connected with the free bearing C11 being fixedly connected on basic arm body 10 axial forward end through second chain rope 5 one end of the second reverse wheel 22 commutation, the other end is connected with the free bearing D31 being fixedly connected on interior telescopic arm body 30 axial forward end so that interior telescopic arm 3 and middle telescopic arm 2 synchronous when shrinking with telescopic arm.
In the present invention, because the flexible pieces such as steel wire rope only draw without the effect pushed away, therefore, when telescopic arm stretches out, always first reverse wheel the 21, first chain rope the 4, the 4th chain rope 7 and volume Two barrier part 9 are playing traction action, and when telescopic arm is retracted, always second reverse wheel the 22, second chain rope the 5, the 3rd chain rope 6 and first volume barrier part 8 are playing traction action.
In the present invention, first reverse wheel 21 and the second reverse wheel 22 are integrally fixed at the rear and front end that middle telescopic arm body 20 is axial, and diametrically, the position of the first reverse wheel 21 and the second reverse wheel 22 can arbitrarily be arranged, it may be located at above or below dividing plate, as long as will not interfere between each running gear.
In the present invention, the cross sectional shape of basic arm body and telescopic arm body is not limited only to square tube, and it can also is that elliptical tube or pipe, and this is all unrestricted in the present invention.
The present invention is different from the telescoping mechanism of concrete spraying vehicle for the telescoping mechanism of precutting trough injection apparatus. In concrete spraying vehicle, Material pipeline (delivering concrete) is arranged on telescopic arm and the radial outside of basic wall, and Material pipeline is sagging or straight condition. And the Material pipeline (delivering concrete) of precutting trough injection apparatus is arranged on the radially inner side of telescopic arm in the present invention, and one end of Material pipeline can arrange and be wound by Material pipeline when pipe-reeling device makes telescopic arm shrink.
In the present invention, described " front end " and " tail end " are not all limited to the endpoint location of axial length, the two front 1/3 part referring to corresponding component axial length respectively and tail 1/3 part.
In a kind of specific embodiment, basic arm body 10 radially inner side has the first gathering sill 14, and have the first slide block 24 at middle telescopic arm body 20 radial outside so that the first slide block slide anteroposterior vertically in the first gathering sill during the motion of middle telescopic arm relatively basic arm. And middle telescopic arm body 20 radially inner side has the second gathering sill 25, interior telescopic arm body 30 radial outside has the second slide block 33 so that interior telescopic arm relatively in telescopic arm motion time the second slide block slide anteroposterior vertically in the second gathering sill.Skilled person will appreciate that, equally possible it is respectively provided with slide block at basic arm body 10 and middle telescopic arm body 20 radially inner side, and it is respectively provided with gathering sill, the effect of the equally possible stable guiding of realization of sliding to telescopic arm at middle telescopic arm body 20 and interior telescopic arm body 30 radial outside.
In conjunction with accompanying drawing it can be seen that present invention aim at providing a kind of telescoping mechanism without using oil cylinder and only using steel wire rope and pulley to complete expanding-contracting action for precutting trough injection apparatus, concrete scheme is as follows:
Such as Fig. 1, parts 1 are basic arms, and the axial forward end of basic arm body 10 has free bearing 11, and axial tail end has free bearing 12, and axial forward end has the 3rd pulley 13; Parts 2 are middle telescopic arms, and the axial forward end of middle telescopic arm body 20 has the first pulley 21, and axial tail end has the second pulley 22, and axial tail end has free bearing E23; Parts 3 are interior telescopic arms, and the axial forward end of interior telescopic arm body 30 has free bearing 31, and axial tail end has free bearing 32; First steel wire rope 4 two ends connect free bearing A12, free bearing B32 respectively, and walk around the first pulley 21; Steel wire rope 5 two ends connect free bearing C11, free bearing D31 respectively, and walk around the second pulley 22; 3rd steel wire rope 6 two ends connect respectively in the axial tail end of telescopic arm and the first elevator 8; 4th steel wire rope 7 two ends connect respectively in the axial tail end of telescopic arm and the second elevator 9, and walk around the 3rd pulley 13.
When elevator 9 tightens up steel wire rope 7 with speed v, basic arm 1 is motionless, middle telescopic arm 2 stretches out with speed v relative to basic arm 1, elevator 8 is servo-actuated and releases steel wire rope 6 with speed v, under the effect of steel wire rope 4, interior telescopic arm 3 stretches out with speed 2v relative to basic arm 1, and in now, telescopic arm 3 is v relative to the speed of middle telescopic arm 2, telescopic arm 3 elongation Tong Bu with middle telescopic arm 2 in namely. And when elevator 8 tightens up steel wire rope 6 with speed v, basic arm 1 is motionless, middle telescopic arm 2 is retracted with speed v relative to basic arm 1, elevator 9 is servo-actuated and releases steel wire rope 7 with speed v, under steel wire rope 5 acts on, interior telescopic arm 3 is retracted with speed 2v relative to basic arm 1, and in now, telescopic arm 3 is relative to the speed v of middle telescopic arm 2, telescopic arm 3 and middle telescopic arm 2 synchronous in namely.
Such as Fig. 2, basic arm body 10 radially inner side has the first gathering sill 14, and have the first slide block 24 at middle telescopic arm body 20 radial outside, when the relatively basic arm of middle telescopic arm moves, first slide block 24 slides in the first gathering sill 14, and all the other directions that the first slide block 24 is carried out except axially by the first gathering sill 14 are spacing. Middle telescopic arm body 20 radially inner side has the second gathering sill 25, interior telescopic arm body 30 radial outside has the second slide block 33, when the relatively middle telescopic arm of interior telescopic arm moves, second slide block 33 slides in the second gathering sill 25, and all the other directions that the second slide block 33 is carried out except axially by the second gathering sill 25 are spacing.
Additionally, middle telescopic arm body 20 is internal is provided with the dividing plate 26 separated by inner chamber, middle telescopic arm inner space is divided into two spaces by dividing plate 26, and a space is used for installing the 3rd chain rope 6 and the 4th chain rope 7, and another space is used for installing other structures. Two spaces are separate, are independent of each other.
In the present invention, steel wire rope used is not limited only to single, it is possible to be steel wire rope group.
Additionally, be possible not only to arrange dividing plate in middle telescopic arm to be divided into two separate space, it is possible to use the inner chamber of basic arm body and interior telescopic arm body is all separated into two or more separate space by dividing plate.
The present invention is without oil cylinder, and telescopic arm and interior telescopic arm two-stage telescopic arm synchronization telescope in only realizing with steel wire rope and pulley, compared with the stretching structure using oil cylinder, simplify structure, greatly reduce telescopic arm weight, improve telescoping mechanism bearing capacity, reduce cost;The structure of gathering sill and slide block, radially slides and circular-rotation between arm and arm when solving motion, and during arm stretching motion, linear type is better; Two separate space that middle telescopic arm dividing plate separates, make the third and fourth steel wire rope and other structures be independent of each other when installing, eliminate interference hidden danger.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. an injection apparatus is with without oil cylinder telescoping mechanism, including the basic arm (1) radially arranged from outside to inside, middle telescopic arm (2) and interior telescopic arm (3), the axial forward end of basic arm body (10) is fixedly installed the 3rd reverse wheel (13), the 4th chain rope (7) one end commutated through the 3rd reverse wheel (13) is connected with volume Two barrier part (9), the other end is connected with the free bearing E (23) being fixedly connected on middle telescopic arm body (20) axially tail end, 4th chain rope (7) retracting is made middle telescopic arm (2) do relative to basic arm (1) to stretch out motion by volume Two barrier part (9), 3rd chain rope (6) one end is connected with first volume barrier part (8), the other end is connected with middle telescopic arm body (20) axially tail end, and the 3rd chain rope (6) retracting is made middle telescopic arm (2) do contractile motion relative to basic arm (1) by first volume barrier part (8),
The axial forward end of middle telescopic arm body (20) and tail end are fixedly installed the first reverse wheel (21) and the second reverse wheel (22) respectively, is connected with the free bearing A (12) being fixedly connected on basic arm body (10) axially tail end through first chain rope (4) one end that the first reverse wheel (21) commutates, the other end is connected with the free bearing B (32) being fixedly connected on the axial tail end of interior telescopic arm body (30) so that when stretching out with telescopic arm, interior telescopic arm (3) and middle telescopic arm (2) Tong Bu stretch out;
Second chain rope (5) one end commutated through the second reverse wheel (22) is connected with the free bearing C (11) being fixedly connected on basic arm body (10) axial forward end, the other end is connected with the free bearing D (31) being fixedly connected on interior telescopic arm body (30) axial forward end so that interior telescopic arm (3) and middle telescopic arm (2) synchronous when shrinking with telescopic arm.
2. telescoping mechanism according to claim 1, it is characterized in that, described free bearing A (12), the second reverse wheel (22), free bearing B (32), free bearing C (11), the first reverse wheel (21) and free bearing D (31) set gradually in the axial direction from tail end to front end.
3. telescoping mechanism according to claim 1, it is characterised in that described Spool piece is elevator.
4. telescoping mechanism according to claim 1, it is characterised in that described interior telescopic arm (3) is arranged on the radial outside for carrying the Material pipeline with gunite concrete.
5. the telescoping mechanism according to any one in Claims 1 to 4, it is characterized in that, basic arm body (10) radially inner side has the first gathering sill (14), and have the first slide block (24) at middle telescopic arm body (20) radial outside so that the first slide block slide anteroposterior vertically in the first gathering sill during the motion of middle telescopic arm relatively basic arm.
6. telescoping mechanism according to claim 5, it is characterized in that, middle telescopic arm body (20) radially inner side has the second gathering sill (25), interior telescopic arm body (30) radial outside has the second slide block (33) so that interior telescopic arm relatively in telescopic arm motion time the second slide block slide anteroposterior vertically in the second gathering sill.
7. the telescoping mechanism according to any one in Claims 1 to 4, it is characterised in that middle telescopic arm body (20) is internal is provided with the dividing plate (26) separated by its inner chamber.
8. the telescoping mechanism according to any one in Claims 1 to 4, it is characterised in that described reverse wheel is pulley, described chain rope is steel wire rope.
9. the telescoping mechanism according to any one in Claims 1 to 4, it is characterised in that described reverse wheel is sprocket wheel, described chain rope is chain.
10. a precutting trough injection apparatus, including telescoping mechanism as described in any one in claim 1～9, is arranged on the Material pipeline of interior telescopic arm body (30) radially inner side and is connected to the pipe-reeling device of Material pipeline length one end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610200902.9A CN105673024A (en) | 2016-03-31 | 2016-03-31 | Oil cylinder-free telescopic mechanism for jet device and precutting trough jet device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610200902.9A CN105673024A (en) | 2016-03-31 | 2016-03-31 | Oil cylinder-free telescopic mechanism for jet device and precutting trough jet device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105673024A true CN105673024A (en) | 2016-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610200902.9A Pending CN105673024A (en) | 2016-03-31 | 2016-03-31 | Oil cylinder-free telescopic mechanism for jet device and precutting trough jet device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105673024A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201280718Y (en) * | 2008-10-24 | 2009-07-29 | 姜国平 | Complete-hydraulic anchor rod grouting trolley |
| CN201544240U (en) * | 2009-10-19 | 2010-08-11 | 三一集团有限公司 | Mechanical arm extension mechanism |
| CN201746291U (en) * | 2010-08-05 | 2011-02-16 | 徐州重型机械有限公司 | Aloft work engineering machine and telescopic arm device thereof |
| CN203463896U (en) * | 2013-07-30 | 2014-03-05 | 西安雷通科技有限责任公司 | Extensible photography rocker arm |
| CN205618166U (en) * | 2016-03-31 | 2016-10-05 | 中国铁建重工集团有限公司 | Injection apparatus reaches grooving injection apparatus in advance with no hydro -cylinder telescopic machanism |
-
2016
- 2016-03-31 CN CN201610200902.9A patent/CN105673024A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201280718Y (en) * | 2008-10-24 | 2009-07-29 | 姜国平 | Complete-hydraulic anchor rod grouting trolley |
| CN201544240U (en) * | 2009-10-19 | 2010-08-11 | 三一集团有限公司 | Mechanical arm extension mechanism |
| CN201746291U (en) * | 2010-08-05 | 2011-02-16 | 徐州重型机械有限公司 | Aloft work engineering machine and telescopic arm device thereof |
| CN203463896U (en) * | 2013-07-30 | 2014-03-05 | 西安雷通科技有限责任公司 | Extensible photography rocker arm |
| CN205618166U (en) * | 2016-03-31 | 2016-10-05 | 中国铁建重工集团有限公司 | Injection apparatus reaches grooving injection apparatus in advance with no hydro -cylinder telescopic machanism |
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Application publication date: 20160615 |