CN109550869B - Reinforcing steel bar arc bending device, reinforcing steel bar welding device and arc bending method - Google Patents
Reinforcing steel bar arc bending device, reinforcing steel bar welding device and arc bending method Download PDFInfo
- Publication number
- CN109550869B CN109550869B CN201910031753.1A CN201910031753A CN109550869B CN 109550869 B CN109550869 B CN 109550869B CN 201910031753 A CN201910031753 A CN 201910031753A CN 109550869 B CN109550869 B CN 109550869B
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- power device
- steel bar
- driven wheel
- seat
- driving wheel
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- 238000005452 bending Methods 0.000 title claims abstract description 56
- 229910001294 Reinforcing steel Inorganic materials 0.000 title claims abstract description 18
- 238000003466 welding Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 66
- 239000010959 steel Substances 0.000 claims abstract description 66
- 230000003014 reinforcing effect Effects 0.000 claims description 20
- 230000002787 reinforcement Effects 0.000 claims description 7
- 230000017105 transposition Effects 0.000 claims description 7
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000003754 machining Methods 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
- B21F1/00—Bending wire other than coiling; Straightening wire
Abstract
The invention discloses a steel bar arc bending device, a steel bar welding device and an arc bending method, and belongs to the technical field of steel bar processing. The invention provides a reinforcing steel bar arc bending device which comprises a frame, a sliding seat, a first power device, a second power device and a third power device, wherein a sliding rail is arranged on the frame along the horizontal direction, the sliding seat is slidably arranged on the sliding rail, a driving wheel and a driven wheel for bending the reinforcing steel bar are arranged on the sliding seat, the first power device is arranged on the frame and can drive the sliding seat to slide along the sliding rail, the second power device can drive the driving wheel to rotate, and the third power device is in driving connection with the driven wheel and can drive the driven wheel to move in the horizontal direction so as to adjust the distance between the driven wheel and the driving wheel in the horizontal direction. The steel bar bending device provided by the invention can adjust the bending position, can process products with various distance specifications, and has the advantages of simple structure, small occupied space, high flexibility, convenience in operation, high automation degree and the like.
Description
Technical Field
The invention relates to the technical field of steel bar machining, in particular to a steel bar bending device, a steel bar welding device and a steel bar bending method.
Background
The shield segment steel reinforcement cage comprises a plurality of shield segment single-piece nets in arc shapes. Fig. 1 is a schematic structural view of a single shield segment single-sheet net 9', as shown in fig. 1, the shield segment single-sheet net 9' comprises an inner arc steel bar 901 'and an outer arc steel bar 902', the inner arc steel bar 901 'and the outer arc steel bar 902' are bent towards the same side, two ends of the inner arc steel bar 901 'and two ends of the outer arc steel bar 902' are welded to form a frame of the shield segment single-sheet net, and a plurality of stirrups 903 'are welded between the inner arc steel bar 901' and the outer arc steel bar 902 'at intervals to form the shield segment single-sheet net 9'.
The welding device of the shield segment single-sheet net 9' in the prior art comprises a steel bar arc bending machine and a welding machine, wherein the steel bar arc bending machine is used for bending and preparing inner arc steel bars 901' and outer arc steel bars 902' on the single-sheet net, and the welding machine is used for welding the inner arc steel bars 901' and the outer arc steel bars 902' after the steel bar arc bending machine is bent.
As shown in fig. 2, the prior art bar bender generally comprises two sets of bending assemblies 8', wherein the bending assemblies 8' comprise a driving wheel 801 'and a driven wheel 802', and the driving wheel 801 'and the driven wheel 802' bend straight bars into arc bars of a required specification. The two sets of arc bending components 8 'are arranged on the concentric circle of the frame in parallel, and the two sets of arc bending components 8' respectively bend the inner arc reinforcing steel bars 901 'and the outer arc reinforcing steel bars 902' of the single-piece net. However, in the prior art, the space between the two sets of arc bending assemblies 8 'is fixed, and the arc bending assemblies can only be used for producing a single-sheet net with a distance specification, and each time a shield segment single-sheet net 9' with a distance specification is produced, a reinforcing steel bar arc bending machine with matched production specifications needs to be equipped, so that the production cost is extremely high, and the occupied space is large.
Disclosure of Invention
The invention aims to provide a steel bar arc bending device which is simple in structure and convenient to operate and can process shield segment single-sheet nets of various specifications.
The invention further aims to provide a steel bar welding device and an arc bending method which are convenient to operate and capable of processing the shield segment single-piece net with various specifications.
In order to achieve the purpose, the invention adopts the following technical scheme:
a rebar bending apparatus comprising:
the rack is provided with a sliding rail along the horizontal direction;
the sliding seat is slidably arranged on the sliding rail, and a driving wheel and a driven wheel for bending the reinforcing steel bar are arranged on the sliding seat;
the first power device is arranged on the rack and can drive the sliding seat to slide along the sliding rail;
the second power device can drive the driving wheel to rotate; and
and the third power device is in driving connection with the driven wheel and can drive the driven wheel to move in the horizontal direction so as to adjust the distance between the driven wheel and the driving wheel in the horizontal direction.
Further, the rebar bending device further comprises:
the lifting seat is arranged on the sliding seat in a lifting manner, and the driving wheel, the driven wheel, the second power device and the third power device are all arranged on the lifting seat; and
and the fourth power device is arranged on the sliding seat and can drive the lifting seat to lift relative to the sliding seat.
Further, guide posts are arranged on two opposite sides of the sliding seat along the vertical direction, and guide grooves or guide through holes for the guide posts to pass through are arranged on two opposite sides of the lifting seat.
Further, a positioning piece capable of preventing the lifting seat from being separated is arranged at the upper end of the guide post.
Further, guide plates are arranged on two opposite sides of the lifting seat along the vertical direction, the driven wheel is rotatably mounted at the front end of the mounting frame, the third power device is in driving connection with the rear end of the mounting frame, and the mounting frame can do linear motion between the guide plates on two sides under the driving of the third power device.
Further, the steel bar bending device further comprises a cover plate, and the cover plate is arranged on the guide plates at two sides.
Further, the total number of the driving wheel and the driven wheel is three, and the rotation center of the driving wheel and the rotation center of the driven wheel are distributed in an isosceles triangle.
On the other hand, the invention provides the following technical scheme:
a rebar welding apparatus comprising a rebar arc apparatus as claimed in any one of the preceding claims.
In yet another aspect, the present invention proposes the following technical solution:
an arc bending method based on the steel bar arc bending device, comprising the following steps:
the sliding seat is positioned at a first station, and a first steel bar enters the receiving device after being bent through a driving wheel and a driven wheel on the sliding seat;
the first power device drives the sliding seat to move from the first station to the second station, and the second reinforcing steel bars enter the receiving device after being bent through the driving wheel and the driven wheel.
In yet another aspect, the present invention proposes the following technical solution:
an arc bending method based on the steel bar arc bending device, comprising the following steps:
the sliding seat is positioned at a first station, and a first steel bar enters the receiving device after being bent through a driving wheel and a driven wheel on the sliding seat;
the fourth power device drives the lifting seat to move downwards to the transposition height;
the first power device drives the sliding seat to move from the lower part of the first station to the lower part of the second station along the horizontal direction;
the fourth power device drives the sliding seat to move upwards from the lower part of the second station to the second station, and the second reinforcing steel bars enter the receiving device after being bent through the driving wheel and the driven wheel;
when the lifting seat is at the transposition height, the first steel bar does not interfere movement of the sliding seat from the lower part of the first station to the lower part of the second station.
The beneficial effects of the invention are as follows:
the steel bar bending device, the steel bar welding device and the steel bar bending method provided by the invention can adjust the bending position, so that the inner arc steel bar and the outer arc steel bar of the shield segment single-sheet net can be processed by only arranging one set of driving wheel and driven wheel, and products with various distance specifications can be processed.
Drawings
FIG. 1 is a schematic structural view of a shield segment monolithic network;
fig. 2 is a schematic perspective view of a conventional bar bender;
fig. 3 is a schematic perspective view of a reinforcing bar bending device according to an embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
FIG. 5 is a side view of FIG. 3;
fig. 6 is a top view of a bar bending apparatus according to an embodiment of the present invention when a first bar is processed;
fig. 7 is a top view of a reinforcing bar bending apparatus according to an embodiment of the present invention when a second reinforcing bar is processed.
Reference numerals:
8', an arc bending component; 801', a drive wheel; 802', driven wheel;
9', shield segment single-piece net; 901', inner arc steel bars; 902', outer arc rebar; 903', stirrups;
1. a frame; 2. a slide; 3. a lifting seat; 4. a first power unit; 5. a second power device; 6. a third power device; 7. a fourth power device; 10. a receiving device;
801. a driving wheel; 802. driven wheel; 901. a first reinforcing bar; 902. a second reinforcing bar;
101. a slide rail; 201. a guide post; 202. a positioning piece; 301. a sleeve; 302. a guide plate; 303. a cover plate; 304. a mounting frame; 3021. a guide groove.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
The specific embodiment of the invention provides a steel bar bending device and a welding device comprising the same, which can be used for processing a shield segment single-sheet net, but are not limited to the steel bar bending device and the welding device.
As shown in fig. 3 and 5, the steel bar bending device comprises a frame 1, a sliding seat 2, a lifting seat 3, a driving wheel 801, a driven wheel 802, a first power device 4, a second power device 5, a third power device 6 and a fourth power device 7. The rack 1 is provided with a sliding rail 101 along the horizontal direction, the sliding rail 101 may be, but not limited to, a sliding block, for example, a sliding groove, the sliding seat 2 is slidably disposed on the sliding rail 101, the first power device 4 is disposed on the rack 1 and can drive the sliding seat 2 to slide along the sliding rail 101, and the first power device 4 may be, but not limited to, an air cylinder. The lifting seat 3 is liftably disposed on the slide 2, the fourth power device 7 is disposed on the slide 2 and can drive the lifting seat 3 to lift relative to the slide 2, and the fourth power device 7 may be, but is not limited to, an air cylinder. The driving wheel 801, the driven wheel 802, the second power device 5 and the third power device 6 are all arranged on the lifting seat 3, the total number of the driving wheel 801 and the driven wheel 802 is preferably but not limited to three, the rotation center of the driving wheel 801 and the rotation center of the driven wheel 802 are distributed in an isosceles triangle, the second power device 5 is in driving connection with the driving wheel 801 and can drive the driving wheel 801 to rotate, the second power device 5 is preferably but not limited to a motor, especially a gear motor, and the third power device 6 is in driving connection with the driven wheel 802 and can drive the driven wheel 802 to move in the horizontal direction so as to adjust the distance between the driven wheel 802 and the driving wheel 801 in the horizontal direction to process reinforcing steel bars with various radians.
Referring to fig. 6 and 7 in combination, the method for bending the reinforcing steel bar comprises the following steps:
as shown in fig. 6, the arrow in fig. 6 indicates the advancing direction of the first reinforcing bar 901, and the second reinforcing bar 902 shown by the dotted line in fig. 6 only schematically indicates the distance between the second reinforcing bar 902 and the first reinforcing bar 901, the slide 2 is located at the first station, and the first reinforcing bar 901 enters the receiving device 10 after being bent through the driving wheel 801 and the driven wheel 802 on the slide 2. Specifically, after feeding in use, the first reinforcing bar 901 contacts the driving wheel 801 and advances under the traction of the driving wheel 801 to enter between the driving wheel 801 and the driven wheel 802 to bend and deform to form an inner arc reinforcing bar, and then enters the receiving device 10. The receiving means 10 may include, but is not limited to, a pulling means for pulling the bar forward.
The fourth power device 7 drives the lifting seat 3 to move downwards to the transposition height.
The first power device 4 drives the sliding seat 2 to move from the lower part of the first station (i.e. at the transposition height) to the lower part of the second station along the horizontal direction, wherein when the lifting seat 3 is at the transposition height, the first steel bar 901 does not interfere with the movement of the sliding seat 2 from the lower part of the first station to the lower part of the second station.
As shown in fig. 7, the arrow in fig. 7 indicates the advancing direction of the second steel bar 902, the first steel bar 901 shown by the dotted line in fig. 7 only schematically indicates the distance between the first steel bar 901 and the second steel bar 902, the fourth power device 7 drives the sliding seat 2 to move from the lower direction of the second station to the second station, the second steel bar 902 forms an inner arc steel bar after being bent by the driving wheel 801 and the driven wheel 802, and then enters the receiving device 10, and the distance between the first steel bar 901 of the receiving device 10 and the second steel bar 902 of the receiving device 10 is the distance between two arc steel bars of the required shield segment single-sheet net.
The first reinforcing bar 901 on the receiving apparatus 10 and the second reinforcing bar 902 of the receiving apparatus 10 are welded by a welder of the welding apparatus.
In other embodiments, the first reinforcement 901 may be formed as an outer arc reinforcement, and the second reinforcement 902 may be formed as an inner arc reinforcement.
The steel bar arc bending device provided by the embodiment can adjust the positions of the driving wheel 801 and the driven wheel 802 in the horizontal direction through the sliding seat 2, and can adjust the heights of the driving wheel 801 and the driven wheel 802 through the lifting seat 3, so that the bent steel bar driving wheel 801 and the driven wheel 802 are separated from the steel bar which is free from interfering with the movement of the sliding seat 2, namely, the bent arc position can be automatically adjusted, the inner arc steel bar 901 and the outer arc steel bar 902 of the shield segment single-sheet net can be processed only by arranging one set of driving wheel 801 and driven wheel 802, and products with various distance specifications can be processed.
In order to ensure that the lifting seat 3 moves along the vertical direction, as shown in fig. 3, guide posts 201 are arranged on two opposite sides of the sliding seat 2 along the vertical direction, sleeves 301 are arranged on two opposite sides of the lifting seat 3, guide through holes for the guide posts 201 to pass through are formed in the sleeves 301, and the number of the guide posts 201 on each side is not limited and can be one or at least two. In other embodiments, the sleeve 301 may be directly opened on the slide 2, or the guide through hole may be changed to a guide groove. The guide post 201 is provided at its upper end with a positioning piece 202 capable of preventing the lifting seat 3 from being separated.
In order to ensure that the driven wheel 802 moves in a straight direction, as shown in fig. 3 and 4, two opposite sides of the lifting seat 3 are provided with guide plates 302 in a vertical direction, and upper ends of the guide plates 302 at the two sides may be, but are not limited to, provided with cover plates 303. The driven wheel 802 is rotatably mounted at the front end of the mounting frame 304, the third power device 6 is in driving connection with the rear end of the mounting frame 304, and the mounting frame 304 can move linearly between the guide plates 302 at both sides under the driving of the third power device 6. Alternatively, a guide groove 3021 is provided on the inner wall of the guide plate 302 in the sliding direction of the mounting frame 304, and a guide block formed on the mounting frame 304 itself or the outer wall of the mounting frame 304 is slidably provided in the guide groove 3021. The mounting frame 304 shown in fig. 3 and fig. 4 includes an upper mounting plate and a lower mounting plate which are oppositely arranged, one ends of the upper mounting plate and the lower mounting plate are connected with each other, the driven wheel 802 is rotatably arranged between the other ends of the upper mounting plate and the lower mounting plate, guide grooves 3021 are respectively formed in the upper side and the lower side of the inner wall of the guide plate 302, the longitudinal section of the guide groove 3021 is L-shaped or inverted L-shaped, and the upper mounting plate and the lower mounting plate are respectively accommodated in the guide grooves 3021 in the upper side and the lower side of the guide plate 302. In other embodiments, a guide block may be provided on the inner wall of the guide plate 302 along the sliding direction of the mounting frame 304, and a guide groove that is sleeved outside the guide block and can slide along the guide block may be provided on the outer wall of the mounting frame 304.
In the other embodiment, the driving wheel 801 and the driven wheel 802 may be directly attached to the carriage 2 without providing the elevating seat 3 and the fourth power unit 7. In an embodiment where the lifting seat 3 and the fourth power device 7 are not provided, the reinforcing bars may be advanced to a position separated from the driving wheel 801 and the driven wheel 802; or even if the steel bars do not advance to the position where the driving wheel 801 and the driven wheel 802 are separated, after the first steel bars 901 are bent, the first steel bars 901 are slightly lifted upwards manually to avoid the first steel bars 901 from affecting the movement of the sliding seat 2, and then the first power device 4 drives the sliding seat 2 to move to the next station along the horizontal direction to bend the second steel bars 902.
The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.
Claims (9)
1. The utility model provides a curved arc device of reinforcing bar is applied to shield segment steel reinforcement cage, shield segment steel reinforcement cage is including a plurality of shield segment monolithic nets that are the arc shape, shield segment monolithic net includes an inner arc reinforcing bar and an outer arc reinforcing bar, its characterized in that includes:
a rack (1) on which a slide rail (101) is arranged in the horizontal direction;
the sliding seat (2) is slidably arranged on the sliding rail (101), and a driving wheel (801) and a driven wheel (802) for bending the reinforcing steel bar are arranged on the sliding seat (2);
the first power device (4) is arranged on the frame (1) and can drive the sliding seat (2) to slide along the sliding rail (101);
a second power device (5) capable of driving the driving wheel (801) to rotate; and
the third power device (6) is in driving connection with the driven wheel (802) and can drive the driven wheel (802) to move in the horizontal direction so as to adjust the distance between the driven wheel (802) and the driving wheel (801) in the horizontal direction;
the reinforcing steel bar bending device further comprises:
the lifting seat (3) is arranged on the sliding seat (2) in a lifting manner, and the driving wheel (801), the driven wheel (802), the second power device (5) and the third power device (6) are all arranged on the lifting seat (3); and
and a fourth power device (7) which is arranged on the sliding seat (2) and can drive the lifting seat (3) to lift relative to the sliding seat (2).
2. The bar bending apparatus of claim 1, wherein,
guide posts (201) are arranged on two opposite sides of the sliding seat (2) along the vertical direction, and guide grooves or guide through holes for the guide posts (201) to pass through are arranged on two opposite sides of the lifting seat (3).
3. The bar bending apparatus of claim 2, wherein,
the upper end of the guide column (201) is provided with a positioning piece (202) which can prevent the lifting seat (3) from being separated.
4. The bar bending apparatus of claim 1, wherein,
the lifting seat is characterized in that guide plates (302) are arranged on two opposite sides of the lifting seat (3) along the vertical direction, the driven wheel (802) is rotatably arranged at the front end of the mounting frame (304), the third power device (6) is in driving connection with the rear end of the mounting frame (304), and the mounting frame (304) can do linear motion between the guide plates (302) on two sides under the driving of the third power device (6).
5. The bar bending apparatus according to claim 4, further comprising a cover plate (303), the cover plate (303) being disposed on the guide plates (302) at both sides.
6. The bar bending apparatus according to any one of claims 1 to 5, wherein,
the total number of the driving wheel (801) and the driven wheel (802) is three, and the rotation center of the driving wheel (801) and the rotation center of the driven wheel (802) are distributed in an isosceles triangle.
7. A rebar welding device comprising a rebar arc device as claimed in any one of claims 1 to 6.
8. An arc bending method based on the reinforcing bar arc bending apparatus of any one of claims 1 to 6, comprising the steps of:
the slide seat (2) is positioned at a first station, and a first steel bar (901) enters the receiving device (10) after being bent through a driving wheel (801) and a driven wheel (802) on the slide seat (2);
the first power device (4) drives the sliding seat (2) to move from a first station to a second station, and the second reinforcing steel bars (902) enter the receiving device (10) after being bent through the driving wheel (801) and the driven wheel (802).
9. An arc bending method based on the reinforcing bar arc bending apparatus of any one of claims 1 to 6, comprising the steps of:
the slide seat (2) is positioned at a first station, and a first steel bar (901) enters the receiving device (10) after being bent through a driving wheel (801) and a driven wheel (802) on the slide seat (2);
the fourth power device (7) drives the lifting seat (3) to move downwards to the transposition height;
the first power device (4) drives the sliding seat (2) to move from the lower part of the first station to the lower part of the second station along the horizontal direction;
the fourth power device (7) drives the lifting seat (3) to move upwards from the lower part of the second station to the second station, and a second reinforcing steel bar (902) enters the receiving device (10) after being bent through the driving wheel (801) and the driven wheel (802);
when the lifting seat (3) is at the transposition height, the first steel bar (901) does not interfere the movement of the sliding seat (2) from the lower part of the first station to the lower part of the second station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910031753.1A CN109550869B (en) | 2019-01-14 | 2019-01-14 | Reinforcing steel bar arc bending device, reinforcing steel bar welding device and arc bending method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910031753.1A CN109550869B (en) | 2019-01-14 | 2019-01-14 | Reinforcing steel bar arc bending device, reinforcing steel bar welding device and arc bending method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109550869A CN109550869A (en) | 2019-04-02 |
| CN109550869B true CN109550869B (en) | 2023-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910031753.1A Active CN109550869B (en) | 2019-01-14 | 2019-01-14 | Reinforcing steel bar arc bending device, reinforcing steel bar welding device and arc bending method |
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| Country | Link |
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| CN (1) | CN109550869B (en) |
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| CN202438637U (en) * | 2012-02-22 | 2012-09-19 | 吴法根 | Rebar bender |
| CN203649211U (en) * | 2013-10-30 | 2014-06-18 | 许昌永博机械制造有限公司 | Arc bending machine for steel bars |
| CN104259343A (en) * | 2014-09-11 | 2015-01-07 | 建科机械（天津）股份有限公司 | Mobile mechanism on steel bar bending machine |
| CN204366604U (en) * | 2015-01-12 | 2015-06-03 | 旭东机械(昆山)有限公司 | Transfer dolly |
| EP2965829A1 (en) * | 2014-07-10 | 2016-01-13 | PEDAX GmbH | Method for bending bendable elongate metal profiles, especially steel rods for concrete enforcement, by a movable bending unit and machine therefore |
| CN105522076A (en) * | 2016-01-14 | 2016-04-27 | 建科机械（天津）股份有限公司 | Arc bending device for outer arc reinforcement and inner arc reinforcement of single shield segment mesh |
| CN107225315A (en) * | 2017-07-06 | 2017-10-03 | 建科机械（天津）股份有限公司 | A kind of arc mesh sheet welding machine of mesh |
| CN209614063U (en) * | 2019-01-14 | 2019-11-12 | 建科机械（天津）股份有限公司 | A kind of reinforcing bar arc-bending device and reinforcement welding device |
-
2019
- 2019-01-14 CN CN201910031753.1A patent/CN109550869B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202438637U (en) * | 2012-02-22 | 2012-09-19 | 吴法根 | Rebar bender |
| CN203649211U (en) * | 2013-10-30 | 2014-06-18 | 许昌永博机械制造有限公司 | Arc bending machine for steel bars |
| EP2965829A1 (en) * | 2014-07-10 | 2016-01-13 | PEDAX GmbH | Method for bending bendable elongate metal profiles, especially steel rods for concrete enforcement, by a movable bending unit and machine therefore |
| CN104259343A (en) * | 2014-09-11 | 2015-01-07 | 建科机械（天津）股份有限公司 | Mobile mechanism on steel bar bending machine |
| CN204366604U (en) * | 2015-01-12 | 2015-06-03 | 旭东机械(昆山)有限公司 | Transfer dolly |
| CN105522076A (en) * | 2016-01-14 | 2016-04-27 | 建科机械（天津）股份有限公司 | Arc bending device for outer arc reinforcement and inner arc reinforcement of single shield segment mesh |
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| CN109550869A (en) | 2019-04-02 |
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