CN108856601B - Single-piece net supporting device and shield segment steel reinforcement cage welding equipment - Google Patents
Single-piece net supporting device and shield segment steel reinforcement cage welding equipment Download PDFInfo
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- CN108856601B CN108856601B CN201810628913.6A CN201810628913A CN108856601B CN 108856601 B CN108856601 B CN 108856601B CN 201810628913 A CN201810628913 A CN 201810628913A CN 108856601 B CN108856601 B CN 108856601B
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- vertical
- fixing seat
- horizontal
- moving seat
- seat
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- 238000003466 welding Methods 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 230000002787 reinforcement Effects 0.000 title claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 24
- 210000000078 claw Anatomy 0.000 claims abstract description 21
- 238000009434 installation Methods 0.000 abstract description 14
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/12—Making special types or portions of network by methods or means specially adapted therefor
- B21F27/121—Making special types or portions of network by methods or means specially adapted therefor of tubular form, e.g. as reinforcements for pipes or pillars
- B21F27/125—Making special types or portions of network by methods or means specially adapted therefor of tubular form, e.g. as reinforcements for pipes or pillars by attaching individual stirrups to longitudinal wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F15/00—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wire Processing (AREA)
Abstract
The invention relates to the technical field of shield segment steel reinforcement cage welding, in particular to a single-piece net supporting device and shield segment steel reinforcement cage welding equipment. The single-piece net supporting device comprises a mounting frame, at least two supporting components are arranged on the mounting frame at intervals, and each supporting component comprises a horizontal fixing seat, a horizontal moving seat, a first driving mechanism, a vertical fixing seat, a vertical moving seat, a second driving mechanism and supporting claws. According to the single-sheet net supporting device, the supporting assembly is integrally arranged on the mounting frame, so that the driving stroke of the vertical driving mechanism can be shortened, the model requirement on the vertical driving mechanism is reduced, and the cost is effectively saved; and secondly, the structure of the supporting component is compact, the space required by installation is reduced, the structural form of the installation rack can be flexibly adjusted according to the installation space, the requirement on the installation space is greatly reduced, and the installation and arrangement are easier.
Description
Technical Field
The invention relates to the technical field of shield segment steel reinforcement cage welding, in particular to a single-piece net supporting device and shield segment steel reinforcement cage welding equipment.
Background
In the tunnel construction process, after the circular hole is dug out by the shield machine, a plurality of arc shield segments are needed to fix the circular hole, so that a firm and safe space is provided for subsequent engineering. The shield segment is formed by combining a shield segment steel reinforcement cage and concrete anchors. Fig. 1 is a schematic structural view of a shield segment steel cage 100, and as shown in fig. 1, the shield segment steel cage 100 includes a plurality of arc-shaped single-piece nets 110 and a plurality of stirrups 120; the plurality of monolithic nets 110 are spaced apart and arranged in parallel with each other; a plurality of stirrups 120 are fixed to the outer edges of the plurality of single webs 110 at intervals and welded in parallel to each other.
In the shield segment steel cage welding apparatus, the single mesh 110 stacked in the stacking device needs to be lifted to the welding position of the welding device by the single mesh lifting device. The prior art provides a single screen jacking device, as shown in fig. 2, the single screen jacking device 10 'comprises two vertical cylinders 11' arranged vertically, a pallet 12 'connected with telescopic ends of the vertical cylinders 11', two horizontal cylinders 13 'arranged on the pallet 12' at intervals, and jacking claws 14 'connected with telescopic ends of the horizontal cylinders 13'. When the monolithic net 110 is lifted, two monolithic net lifting devices 10 'are required to be respectively arranged at two sides of the monolithic net 110, specifically, firstly, a horizontal cylinder 13' drives a lifting claw 14 'to extend towards the monolithic net 110 along a horizontal guide rail 16', and the lifting claws 14 'in the monolithic net lifting devices 10' at two sides of the monolithic net 110 respectively clamp an inner arc steel bar 110a and an outer arc steel bar 110b of the monolithic net 110; then the vertical cylinder 11 'lifts the pallet 12' upward along the vertical guide rail 15', the pallet 12' moves upward with the lifting claw 14 'and the single piece net 110, and when the single piece net 110 is lifted to a position where welding with the stirrup 120 is performed, the vertical cylinder 11' stops driving; finally, the horizontal cylinder 13 'drives the lifting claw 14' to retract along the horizontal guide rail 16', and the vertical cylinder 11' drives the supporting plate 12 'to retract and reset along the vertical guide rail 15', so that the process of lifting one single-piece net 110 is completed.
The single-sheet net supporting device in the prior art has the following defects: the vertical travel of the shield segment steel cage welding device is completely provided by the vertical cylinder, so that the model of the vertical cylinder is larger, the cost is increased, larger installation space is occupied, the installation space of the shield segment steel cage welding device is limited, and the space arrangement of the supporting device on the welding device is difficult. Therefore, a single-piece net supporting device and shield segment steel reinforcement cage welding equipment are needed to solve the technical problems.
Disclosure of Invention
The invention aims to provide a single-sheet net supporting device to solve the technical problems of high cost, large occupied installation space and difficult installation and arrangement in the prior art.
To achieve the purpose, the invention adopts the following technical scheme:
the single-sheet net supporting device comprises a mounting frame, wherein at least two supporting components are arranged on the mounting frame at intervals, and each supporting component comprises a horizontal fixing seat, a horizontal moving seat, a first driving mechanism, a vertical fixing seat, a vertical moving seat, a second driving mechanism and a supporting claw;
the horizontal fixing seat is fixedly arranged on the mounting frame, and the horizontal moving seat is in sliding fit with the horizontal fixing seat and can horizontally move along the horizontal fixing seat under the driving of the first driving mechanism; the vertical fixing seat is fixedly arranged on the horizontal moving seat, and the vertical moving seat is in sliding fit with the vertical fixing seat and can vertically move along the vertical fixing seat under the driving of the second driving mechanism; the supporting claw is fixedly connected to the vertical moving seat.
Preferably, one of the horizontal fixing seat and the horizontal moving seat is provided with a first pulley, and the other one of the two is provided with a first chute matched with the first pulley.
Preferably, the horizontal fixing seat comprises a bottom plate and two pulley mounting plates, and the pulley mounting plates are provided with the first pulleys; the horizontal moving seat is positioned between the two pulley mounting plates, and the two opposite side surfaces of the horizontal moving seat are respectively provided with the first sliding grooves extending along the horizontal direction.
Preferably, the first driving mechanism is a first cylinder, the first cylinder is fixed on the horizontal fixing seat, and the driving end of the first cylinder is in driving connection with the horizontal moving seat.
Preferably, one of the vertical fixing seat and the vertical moving seat is provided with a second pulley, and the other one of the two is provided with a second chute matched with the second pulley.
Preferably, the cross section of the vertical fixing seat is U-shaped, and the two opposite side surfaces of the vertical fixing seat are respectively provided with the second pulleys; the vertical moving seat is positioned at the inner side of the vertical fixing seat, and the two opposite side surfaces of the vertical moving seat are respectively provided with the second sliding groove extending along the vertical direction.
Preferably, the second driving mechanism is a second air cylinder, the fixed end of the second air cylinder is fixed on the horizontal moving seat, and the driving end of the second air cylinder is in driving connection with the vertical moving seat.
The invention further aims to provide shield segment steel reinforcement cage welding equipment which comprises the single-sheet net supporting device.
Preferably, the device further comprises a stacking device and a welding device, wherein the stacking device is used for stacking single-piece nets; the two single-sheet net supporting devices are respectively arranged at two sides of the stacking device and are used for supporting the single-sheet nets one by one; the welding device is arranged above the stacking device and is used for welding stirrups and the supported single-piece net.
Compared with the prior art, the invention has the beneficial effects that:
according to the single-sheet net supporting device, the supporting assembly is integrally arranged on the mounting frame, so that the driving stroke of the vertical driving mechanism can be shortened, the model requirement on the vertical driving mechanism is reduced, and the cost is effectively saved; and secondly, the structure of the supporting component is compact, the space required by installation is reduced, the structural form of the installation rack can be flexibly adjusted according to the installation space, the requirement on the installation space is greatly reduced, and the installation and arrangement are easier.
Drawings
Fig. 1 is a schematic structural view of a shield segment steel cage;
FIG. 2 is a schematic diagram of a prior art single piece net lifting device;
FIG. 3 is a schematic view of the structure of the single-sheet net supporting device provided by the invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a cross-sectional view taken along B-B in FIG. 3;
fig. 6 is a schematic structural view of the shield segment steel reinforcement cage welding equipment provided by the invention.
In the figure:
100-shield segment steel reinforcement cage; 110-a monolithic net; 110 a-inner arc rebar; 110 b-outer arc rebar; 120-stirrups;
a 10' -monolithic net supporting device; 11' -vertical cylinder; 12' -pallet; 13' -horizontal cylinder; 14' -lifting claws; 15' -vertical guide rail; 16' -horizontal guide rail;
10a single-sheet net supporting device; 11-mounting rack; 12-a horizontal fixing seat; 121-a bottom plate; 122-pulley mounting plate; 123-a first pulley; 124-cylinder mounting plate; 13-a horizontal movement seat; 131-a first chute; 14-a first cylinder; 15-a vertical fixing seat; 151-a second pulley; 16-a vertical mobile seat; 161-a second chute; 162-connecting plates; 17-a second cylinder; 18-lifting the claw;
20-stacking means; 30-welding device.
Detailed Description
The technical scheme of the invention is further described below with reference to the attached drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.
As shown in fig. 3, the present invention provides a single-sheet net supporting device, which comprises a mounting frame 11, at least two supporting components are arranged on the mounting frame 11 at intervals, and each supporting component comprises a horizontal fixing seat 12, a horizontal moving seat 13, a first driving mechanism, a vertical fixing seat 15, a vertical moving seat 16, a second driving mechanism and a supporting claw 18. The horizontal fixing seat 12 is fixedly arranged on the mounting frame 11, and the horizontal moving seat 13 is in sliding fit with the horizontal fixing seat 12 and can horizontally move along the horizontal fixing seat 12 under the drive of the first driving mechanism; the vertical fixing seat 15 is fixedly arranged on the horizontal moving seat 13, and the vertical moving seat 16 is in sliding fit with the vertical fixing seat 15 and can vertically move along the vertical fixing seat 15 under the drive of the second driving mechanism; the holding claw 18 is fixedly attached to the vertically movable base 16.
The horizontal moving seat 13 is in sliding fit with the horizontal fixing seat 12 in a form of a pulley and a chute. In the present embodiment, referring to fig. 3 to 5, the horizontal fixing base 12 is provided with a first pulley 123, and the horizontal moving base 13 is provided with a first chute 131. Specifically, the horizontal fixing seat 12 includes a bottom plate 121 and two pulley mounting plates 122 that are distributed at intervals and perpendicular to the bottom plate 121, the interval direction of the two pulley mounting plates 122 is perpendicular to the moving direction of the horizontal moving seat 13, and each pulley mounting plate 122 is provided with at least two first pulleys 123 that are arranged along the horizontal direction; the horizontal moving seat 13 is located between the two pulley mounting plates 122, and two opposite sides of the horizontal moving seat 13 are respectively provided with a first chute 131 extending along the horizontal direction. Alternatively, in other embodiments, the horizontal fixing base 12 may be provided with a first chute 131, and the horizontal moving base 13 may be provided with a first pulley 123. Preferably, the first driving mechanism is a first air cylinder 14, the horizontal fixing base 12 further comprises an air cylinder mounting plate 124 perpendicular to the bottom plate 121, the first air cylinder 14 is fixed on the air cylinder mounting plate 124, and the telescopic end of the first air cylinder 14 is in driving connection with the horizontal moving base 13.
The vertical moving seat 16 and the vertical fixing seat 15 are also in sliding fit with each other in a form of a pulley and a chute. In this embodiment, referring to fig. 3 and 4, the vertical fixing base 15 is provided with a second pulley 151, and the vertical moving base 16 is provided with a second chute 161. Specifically, the cross section of the vertical fixing seat 15 is in a U shape, and two opposite sides of the vertical fixing seat 15 are respectively provided with at least two second pulleys 151 arranged along the vertical direction; the vertical moving seat 16 is located at the inner side of the vertical fixing seat 15, and the opposite two side surfaces of the vertical moving seat 16 are respectively provided with a second chute 161 extending along the vertical direction. Alternatively, in other embodiments, the vertical fixing seat 15 may be provided with a second chute 161, and the vertical moving seat 16 may be provided with a second pulley 151. Preferably, the second driving mechanism is a second air cylinder 17, the fixed end of the second air cylinder 17 is fixed on the horizontal moving seat 13, and the driving end of the second air cylinder 17 is in driving connection with the vertical moving seat 16 through a connecting plate 162.
The matching form of the pulley and the sliding groove is easier to realize and lower in cost than the matching form of the sliding rail and the sliding block in the prior art. It will be understood, of course, that the form of sliding engagement of the horizontal moving seat 13 with the horizontal fixed seat 12 and the vertical moving seat 16 with the vertical fixed seat 15 is not limited to the form of pulleys and runners, and any other form capable of achieving sliding engagement therebetween may be used in the present invention, and is not specifically described herein.
As shown in fig. 6, the invention further provides a shield segment steel reinforcement cage welding device, which comprises the single-sheet net supporting device 10, a stacking device 20 and a welding device 30. Wherein the stacking device 20 is used for stacking the single-sheet nets 110; the two single-sheet net supporting devices 10 are respectively arranged at two sides of the stacking device 20, wherein the supporting claw 18 at one side faces to the inner arc reinforcing steel bar 110a of the single-sheet net 110, and the supporting claw 18 at the other side faces to the outer arc reinforcing steel bar 110b of the single-sheet net 110; the welding device 30 is arranged above the stacking device 20. The single-sheet net supporting device is used for supporting the single-sheet nets 110 in the stacking device 20 into the welding device 30 one by one and welding the single-sheet nets with the stirrups 120 to form the shield segment steel cage 100.
The working process of the shield segment steel reinforcement cage welding equipment provided by the invention is as follows: first, the first cylinders 14 at two sides of the stacking device 20 drive the horizontal moving seats 13 to move forward, the horizontal moving seats 13 drive the supporting claws 18 to extend to the single-sheet net 110 which is orderly stacked in the stacking device 20 along the horizontal direction, and the supporting claws 18 at two sides of the stacking device 20 are respectively clamped on the inner arc steel bars 110a and the outer arc steel bars 110b; then, the second cylinders 17 at both sides of the stacking device 20 drive the vertical moving seats 16 to move upwards, the vertical moving seats 16 carry the supporting claws 18 and the single piece net 110 to move upwards, when the single piece net 110 is supported to a position where the single piece net 110 is welded with the stirrups 120, the second cylinders 17 stop driving, and the supporting parts in the welding device 30 extend to support the single piece net 110; then the first cylinder 14 drives the horizontal moving seat 13 to move backwards, the horizontal moving seat 13 carries the supporting claw 18 to retract along the horizontal direction, the second cylinder 17 drives the vertical moving seat 16 to move downwards, the vertical moving seat 16 carries the supporting claw 18 to move downwards for resetting, and meanwhile the welding device 30 welds the stirrups 120 and the single-piece net 110 which is supported in place; the above-described actions are repeated until the shield segment steel cage 100 is formed.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (5)
1. The shield segment steel reinforcement cage welding equipment is characterized by comprising a single-piece net supporting device, wherein the single-piece net supporting device comprises a mounting frame (11), at least two supporting components are arranged on the mounting frame (11) at intervals, and each supporting component comprises a horizontal fixing seat (12), a horizontal moving seat (13), a first driving mechanism, a vertical fixing seat (15), a vertical moving seat (16), a second driving mechanism and supporting claws (18);
the horizontal fixing seat (12) is fixedly arranged on the mounting frame (11), and the horizontal moving seat (13) is in sliding fit with the horizontal fixing seat (12) and can horizontally move along the horizontal fixing seat (12) under the driving of the first driving mechanism; the vertical fixing seat (15) is fixedly arranged on the horizontal moving seat (13), and the vertical moving seat (16) is in sliding fit with the vertical fixing seat (15) and can vertically move along the vertical fixing seat (15) under the drive of the second driving mechanism; the supporting claw (18) is fixedly connected to the vertical moving seat (16);
the first driving mechanism is a first air cylinder (14), the first air cylinder (14) is fixed on the horizontal fixing seat (12), and the driving end of the first air cylinder (14) is in driving connection with the horizontal moving seat (13);
the second driving mechanism is a second air cylinder (17), the fixed end of the second air cylinder (17) is fixed on the horizontal moving seat (13), and the driving end of the second air cylinder (17) is in driving connection with the vertical moving seat (16);
the shield segment steel reinforcement cage welding equipment further comprises a stacking device (20) and a welding device (30), wherein the stacking device (20) is used for stacking single-piece nets (110); the two single-sheet net supporting devices (10) are respectively arranged at two sides of the stacking device (20) and are used for supporting the single-sheet nets (110) one by one; the welding device (30) is arranged above the stacking device (20) and is used for welding stirrups (120) and the lifted single-piece net (110).
2. The shield segment steel cage welding equipment according to claim 1, wherein one of the horizontal fixing seat (12) and the horizontal moving seat (13) is provided with a first pulley (123), and the other one of the two is provided with a first chute (131) matched with the first pulley (123).
3. The shield segment steel cage welding equipment according to claim 2, wherein the horizontal fixing seat (12) comprises a bottom plate (121) and two pulley mounting plates (122), and the first pulleys (123) are arranged on the pulley mounting plates (122); the horizontal moving seat (13) is located between the two pulley mounting plates (122), and the two opposite side surfaces of the horizontal moving seat (13) are respectively provided with a first chute (131) extending along the horizontal direction.
4. Shield segment steel reinforcement cage welding equipment according to claim 1, characterized in that one of the vertical fixing seat (15) and the vertical moving seat (16) is provided with a second pulley (151), and the other one of the two is provided with a second chute (161) matched with the second pulley (151).
5. The shield segment steel cage welding equipment according to claim 4, wherein the cross section of the vertical fixing seat (15) is U-shaped, and the two opposite sides of the vertical fixing seat are respectively provided with the second pulleys (151); the vertical moving seat (16) is located at the inner side of the vertical fixing seat (15), and the two opposite side surfaces of the vertical moving seat (16) are respectively provided with the second sliding groove (161) extending along the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810628913.6A CN108856601B (en) | 2018-06-19 | 2018-06-19 | Single-piece net supporting device and shield segment steel reinforcement cage welding equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810628913.6A CN108856601B (en) | 2018-06-19 | 2018-06-19 | Single-piece net supporting device and shield segment steel reinforcement cage welding equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108856601A CN108856601A (en) | 2018-11-23 |
| CN108856601B true CN108856601B (en) | 2024-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810628913.6A Active CN108856601B (en) | 2018-06-19 | 2018-06-19 | Single-piece net supporting device and shield segment steel reinforcement cage welding equipment |
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| Country | Link |
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| CN (1) | CN108856601B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116984813B (en) * | 2023-09-27 | 2023-12-15 | 中交三航(南通)海洋工程有限公司 | Stacking device in shield segment steel reinforcement cage automatic welding equipment |
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| CN2202597Y (en) * | 1994-02-05 | 1995-07-05 | 陈达兴企业股份有限公司 | Steel wire cage automatic shaping machine |
| JP2012036667A (en) * | 2010-08-10 | 2012-02-23 | Sasaki Corporation | Device and method for assembling reinforcement cage |
| CN102458711A (en) * | 2009-05-28 | 2012-05-16 | Mep意大利美普机械制造有限公司 | Machine to make reinforcement cages, welding device to make reinforcement cages and relative producti |
| CN203003353U (en) * | 2012-11-02 | 2013-06-19 | 济南吉利汽车有限公司 | Clamp lifting device |
| CN103466336A (en) * | 2013-09-04 | 2013-12-25 | 建科机械（天津）股份有限公司 | Stacking device of automatic shield segment steel cage welding equipment |
| CN103464955A (en) * | 2013-09-04 | 2013-12-25 | 建科机械（天津）股份有限公司 | Single mesh holding device of shield segment steel cage single mesh squeezing and welding equipment |
| CN103464656A (en) * | 2013-09-04 | 2013-12-25 | 建科机械（天津）股份有限公司 | Single mesh holding device of automatic shield segment steel cage welding equipment |
| CN203428545U (en) * | 2013-07-30 | 2014-02-12 | 河北骄阳丝网设备有限责任公司 | Steel bar mesh stacking output device |
| CN208495664U (en) * | 2018-06-19 | 2019-02-15 | 建科机械（天津）股份有限公司 | A kind of single mesh picking-up device and welding equipment |
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2018
- 2018-06-19 CN CN201810628913.6A patent/CN108856601B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2202597Y (en) * | 1994-02-05 | 1995-07-05 | 陈达兴企业股份有限公司 | Steel wire cage automatic shaping machine |
| CN102458711A (en) * | 2009-05-28 | 2012-05-16 | Mep意大利美普机械制造有限公司 | Machine to make reinforcement cages, welding device to make reinforcement cages and relative producti |
| JP2012036667A (en) * | 2010-08-10 | 2012-02-23 | Sasaki Corporation | Device and method for assembling reinforcement cage |
| CN203003353U (en) * | 2012-11-02 | 2013-06-19 | 济南吉利汽车有限公司 | Clamp lifting device |
| CN203428545U (en) * | 2013-07-30 | 2014-02-12 | 河北骄阳丝网设备有限责任公司 | Steel bar mesh stacking output device |
| CN103466336A (en) * | 2013-09-04 | 2013-12-25 | 建科机械（天津）股份有限公司 | Stacking device of automatic shield segment steel cage welding equipment |
| CN103464955A (en) * | 2013-09-04 | 2013-12-25 | 建科机械（天津）股份有限公司 | Single mesh holding device of shield segment steel cage single mesh squeezing and welding equipment |
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| Publication number | Publication date |
|---|---|
| CN108856601A (en) | 2018-11-23 |
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