Shield segment production line and method of producing the same

Abstract

The application belongs to the technical field of shield segment production line, and discloses a shield segment production line and a production method thereof. The shield segment production line comprises a feeding mechanism, an arc bending mechanism, an arc bending correction mechanism, a plane net welding mechanism and a three-dimensional net welding die. The feeding mechanism is used for providing straight steel bars to the arc bending mechanism. The arc bending mechanism bends the straight steel bars to form arc steel bars. The arc bending correction mechanism corrects the arc of the arc steel bars and then conveys the arc steel bars to the plane net welding mechanism. The plane net welding mechanism welds the arc steel bars to obtain plane net steel bars. A cantilever grabbing mechanism grabs the plane net steel bars and sequentially stacks them on at least two three-dimensional net welding dies. The plane net steel bars with a specified number are welded on the three-dimensional net welding dies to obtain three-dimensional net steel bars. The application realizes continuous feeding and welding, thereby reducing the material occupation space, greatly improving the production efficiency and reducing the forming error caused by transportation.

Description

Technical Field

[0001] This invention relates to the field of shield tunnel segment production line technology, and in particular to a shield tunnel segment production line and its production method. Background Technology

[0002] The shield tunnel segment production line includes steel bar feeding, planar mesh welding feeding, and three-dimensional mesh welding. In the existing layout, the planar mesh and three-dimensional mesh are scattered, which increases the handling or transfer process from the planar mesh station to the three-dimensional mesh welding station. The transfer process may cause deformation of the planar mesh. In addition, a certain amount of planar mesh is stored after welding and then transported, which increases the space occupied. Moreover, multiple handling increases the forming error of the three-dimensional mesh. Summary of the Invention

[0003] The purpose of this invention is to provide a shield tunnel segment production line and its production method to solve the problems of large footprint and large forming error of three-dimensional mesh caused by the dispersed arrangement of planar mesh welding and three-dimensional mesh welding on the production line.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] The tunnel segment production line includes:

[0006] The feeding mechanism is used to simultaneously supply two straight steel bars;

[0007] A bending mechanism is arranged at the end of the feeding mechanism, and the bending mechanism is used to bend the straight steel bar to form a curved steel bar;

[0008] A bending correction mechanism is arranged at the end of the bending mechanism, and the bending correction mechanism is used to transport the bent steel bar and correct its curvature.

[0009] A planar mesh welding mechanism is arranged at the end of the bending correction mechanism, and the bent steel bars are welded in the planar mesh welding mechanism to obtain planar mesh steel bars;

[0010] At least two three-dimensional mesh welding molds are provided, both of which are located at the end of the planar mesh welding mechanism, for combining and welding multiple planar mesh reinforcing bars to obtain three-dimensional mesh reinforcing bars;

[0011] A cantilever gripping mechanism is disposed between the planar mesh welding mechanism and the three-dimensional mesh welding mold. The cantilever gripping mechanism is used to grip the planar mesh reinforcing bars and stack them sequentially on at least two of the three-dimensional mesh welding molds.

[0012] Optionally, the tunnel segment production line also includes welding robots, with at least two welding robots, which are capable of reciprocating between at least two three-dimensional mesh welding molds to perform the combined welding.

[0013] Optionally, the tunnel segment production line also includes robot tracks, with two robot tracks respectively located on both sides of the plurality of three-dimensional mesh welding molds, and at least one welding robot slidably connected to each robot track.

[0014] Optionally, the curvature correction mechanism includes:

[0015] Curved plate;

[0016] The active wheel is provided in multiple ways, and the multiple active wheels are spaced apart on the curved plate along the arc direction of the curved steel bar. The active wheels are rotatably mounted on the curved plate.

[0017] The driven wheel is provided in multiple ways, and the multiple driven wheels are arranged one-to-one with the multiple driving wheels. The driven wheel is slidably connected to the curved plate. The driven wheel can move toward or away from the driving wheel to clamp or release the curved steel bar.

[0018] Optionally, the curvature correction mechanism further includes a first drive mechanism, which is disposed on the curvature plate, and the output end of the first drive mechanism is connected to the drive wheel to drive the rotation of the drive wheel.

[0019] Optionally, the curvature correction mechanism further includes a second drive mechanism, which is disposed on the curvature plate, and the output end of the second drive mechanism is connected to the driven wheel to drive the driven wheel to slide on the curvature plate.

[0020] Optionally, the curved plate is provided with a sliding groove, and the sliding groove is provided in multiple sets. The multiple sets of sliding grooves are arranged along the arc direction of the curved steel bar, and the two sliding grooves in each set are arranged opposite each other along the direction perpendicular to the arc direction. The driven wheel is slidably connected in the sliding groove.

[0021] Optionally, both the driving wheel and the driven wheel are V-section rollers.

[0022] The present invention also provides a method for producing tunnel segments, which, according to the tunnel segment production line, includes the following steps:

[0023] S1, the feeding mechanism conveys straight steel bars;

[0024] S2, the bending mechanism receives the straight steel bar and bends the straight steel bar to obtain a bent steel bar;

[0025] S3, the bent steel bar enters the bending correction mechanism;

[0026] S4, the curved steel bar after curvature correction is conveyed forward and welded by the planar mesh welding mechanism to obtain planar mesh steel bar;

[0027] S5, the cantilever gripping mechanism grips the planar mesh steel bars and stacks them onto the three-dimensional mesh welding mold;

[0028] S6, Repeat steps S1-S5 until the three-dimensional mesh welding mold has a specified number of planar mesh reinforcement bars;

[0029] S7, the specified number of planar mesh steel bars are combined and welded to obtain a three-dimensional mesh steel bar. At the same time, the cantilever gripping mechanism continues to grip the planar mesh steel bars and stack them onto the next three-dimensional mesh welding mold.

[0030] S8, proceed to step S6.

[0031] Optionally, in step S6, when the planar mesh reinforcement reaches a specified quantity, the welding robot starts and runs to the three-dimensional mesh welding mold to perform combined welding. After the combined welding is completed, the welding robot runs to the next three-dimensional mesh welding mold to perform combined welding.

[0032] The beneficial effects of this invention are:

[0033] The shield tunnel segment production line of the present invention, by setting up a cantilever gripping mechanism, can continuously grip planar mesh reinforcement bars from the planar mesh welding mechanism and stack them onto a three-dimensional mesh welding mold until the required quantity is met, and then continue to stack them onto another three-dimensional mesh welding mold. The previous three-dimensional mesh welding mold then begins welding the three-dimensional mesh reinforcement bars, thereby realizing continuous feeding and welding between the planar mesh welding mechanism and at least two three-dimensional mesh welding molds. This helps to reduce the storage space occupied by the planar mesh reinforcement bars and greatly improves production efficiency. The shield tunnel segment production line does not require storing planar mesh reinforcement bars to a specified quantity before handling or transferring them, reducing forming errors caused by handling. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the shield tunnel segment production line provided in an embodiment of the present invention (the state of the cantilever gripping mechanism gripping the planar mesh reinforcement);

[0035] Figure 2 This is a structural schematic diagram of the shield tunnel segment production line provided in an embodiment of the present invention (the state of the cantilever gripping mechanism stacking planar mesh reinforcement);

[0036] Figure 3 This is a schematic diagram of the bending correction mechanism in the shield tunnel segment production line provided in this embodiment of the invention.

[0037] In the picture:

[0038] 1. Feeding mechanism; 2. Bending mechanism; 3. Bending correction mechanism; 31. Bending plate; 32. Driving wheel; 33. Driven wheel; 34. Second drive mechanism; 35. Slide groove; 4. Planar mesh welding mechanism; 5. Three-dimensional mesh welding mold; 6. Cantilever gripping mechanism; 7. Welding robot; 8. Robot track. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0040] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0043] This invention provides a shield tunnel segment production line and its production method to solve the problems of large footprint and large forming error of three-dimensional mesh caused by the dispersed arrangement of planar mesh welding and three-dimensional mesh welding on the production line.

[0044] The shield tunnel segment production line provided by this invention, such as Figures 1-3 As shown, the assembly includes a feeding mechanism 1, a bending mechanism 2, a bending correction mechanism 3, a planar mesh welding mechanism 4, a three-dimensional mesh welding mold 5, and a cantilever gripping mechanism 6 arranged sequentially. The feeding mechanism 1 simultaneously provides two straight steel bars, which are conveyed side-by-side. The bending mechanism 2 is located at the end of the feeding mechanism 1 and is used to bend the straight steel bars to form curved steel bars. The bending correction mechanism 3 is located at the end of the bending mechanism 2 and is used to convey and correct the curvature of the curved steel bars. The planar mesh welding mechanism 4 is located at the end of the bending correction mechanism 3, where the curved steel bars are welded to obtain planar mesh steel bars. At least two three-dimensional mesh welding molds 5 are provided, both located at the end of the planar mesh welding mechanism 4, and are used to combine and weld multiple planar mesh steel bars to obtain three-dimensional mesh steel bars. The cantilever gripping mechanism 6 is located between the planar mesh welding mechanism 4 and the three-dimensional mesh welding mold 5, and is used to grip the planar mesh steel bars and sequentially stack them on at least two of the three-dimensional mesh welding molds 5.

[0045] In this embodiment of the shield tunnel segment production line, taking the setup of two three-dimensional mesh welding molds 5 as an example, a cantilever gripping mechanism 6 is positioned in the middle of the two three-dimensional mesh welding molds 5, and can switch between gripping and stacking planar mesh reinforcement bars between the planar mesh welding mechanism 4 and the two three-dimensional mesh welding molds 5. Specifically, by setting up the cantilever gripping mechanism 6, the cantilever gripping mechanism 6 can continuously grip planar mesh reinforcement bars from the planar mesh welding mechanism 4 and stack them onto one three-dimensional mesh welding mold 5 until the quantity meets the requirements, such as... Figure 1 and Figure 2 As shown in the two states, the material continues to be stacked onto another three-dimensional mesh welding mold 5. The previous three-dimensional mesh welding mold 5 begins welding the three-dimensional mesh reinforcement, thereby achieving continuous feeding and welding between the planar mesh welding mechanism 4 and at least two three-dimensional mesh welding molds 5. This eliminates the need for storing planar mesh reinforcement materials, occupies space, and enables continuous production, greatly improving production efficiency. This shield tunnel segment production line does not require storing planar mesh reinforcement to a specified quantity before handling or transferring it, reducing forming errors caused by handling. Continuous operation also significantly reduces the intensity of manual labor. The shield tunnel segment production line of this invention has the advantages of simple structure, small footprint, easy manufacturing, low cost, and stable operation. It should be noted that the cantilever gripping mechanism 6 is rotatably positioned between the planar mesh welding mechanism 4 and at least two three-dimensional mesh welding molds 5 and is controlled by a motor to flexibly switch the stacking position.

[0046] Optionally, the tunnel segment production line also includes welding robots 7, of which at least two are provided, and the at least two welding robots 7 are capable of reciprocating between at least two three-dimensional mesh welding molds 5 to perform combined welding.

[0047] like Figure 1 As shown, in this embodiment, two welding robots 7 are set up, located on the left and right sides of the three-dimensional mesh welding mold 5 respectively. The two welding robots 7 can reciprocate between the two three-dimensional mesh welding molds 5 and can be driven to work simultaneously to perform combined welding on both sides of multiple planar mesh steel bars on the three-dimensional mesh welding mold 5 at the same time, so as to improve welding efficiency. Alternatively, welding robots 7 can be fixedly set on the left and right sides of each three-dimensional mesh welding mold 5. When the number of planar mesh steel bars on the three-dimensional mesh welding mold 5 reaches a specified number, welding can be started directly, reducing the space occupation requirement of reciprocating motion. At the same time, a small number of welding robots 7 reciprocating between multiple work positions helps to reduce the use cost. Therefore, the number, position and movement mode of welding robots 7 can be selected according to the site space requirements.

[0048] Optionally, the tunnel segment production line also includes robot tracks 8. There are two robot tracks 8, which are located on both sides of multiple three-dimensional mesh welding molds 5. At least one welding robot 7 is slidably connected to each robot track 8.

[0049] For example Figure 1 In this embodiment, two three-dimensional mesh welding molds 5 are arranged side by side at the end of the planar mesh welding mechanism 4. A robot track 8 is set on the left and right sides of each of the two three-dimensional mesh welding molds 5, so that the two welding robots 7 on both sides can reciprocate between the two three-dimensional mesh welding molds 5 to perform combined welding work. Since the planar mesh steel bars are fed alternately on the two three-dimensional mesh welding molds 5, the reciprocating welding by the two welding robots 7 has the advantages of optimizing the production line layout, improving production efficiency, and reducing production costs.

[0050] Optionally, the bending correction mechanism 3 includes a bending plate 31, a driving wheel 32, and a driven wheel 33. Multiple driving wheels 32 are provided, and the multiple driving wheels 32 are spaced apart on the bending plate 31 along the curvature direction of the bent steel bar. The driving wheels 32 are rotatably mounted on the bending plate 31. Multiple driven wheels 33 are provided, and the multiple driven wheels 33 are arranged one-to-one with the multiple driving wheels 32. The driven wheels 33 are slidably connected to the bending plate 31, and the driven wheels 33 can move toward or away from the driving wheels 32 to clamp or release the bent steel bar.

[0051] It should be noted that, Figure 1 The bending correction mechanism 3 in the middle is relative to Figure 3 The layout has been simplified to clearly show the position of the bending correction mechanism 3. Figure 3 An embodiment of the bending correction mechanism 3 is given, wherein the bending plate 31 has the same curvature as the bending steel bar to facilitate installation and positioning. Figure 3In the illustrated embodiment, four driving wheels 32 and four driven wheels 33 are respectively arranged opposite to each other for two straight steel bars. Two rows of driving wheels 32 are arranged on both sides of the central axis of the bending plate 31, and two rows of driven wheels 33 are respectively arranged on the outer sides of the two rows of driving wheels 32. When the driven wheels 33 slide towards the driving wheels 32, they can clamp the bent steel bars. The four clamping points give the bent steel bars a corrected curvature. By controlling the rotation direction of the driving wheels 32, the forward and backward driving feeding of the bent steel bars can be achieved. It can be understood that the rotation axes of both the driving wheels 32 and the driven wheels 33 are perpendicular to the bending plate 31, and the driving wheels 32 and the driven wheels 33 rotate in the same plane to facilitate clamping, correcting, and conveying the bent steel bars.

[0052] Optionally, the bending correction mechanism 3 also includes a first drive mechanism, which is disposed on the bending plate 31, and the output end of the first drive mechanism is connected to the drive wheel 32 to drive the rotation of the drive wheel 32.

[0053] The first drive mechanism is not shown in the attached drawings. It is located on the upper and lower sides of the curved plate 31, respectively, along with the drive wheel 32. The first drive mechanism is configured to drive the drive wheel 32 to rotate and provide power for conveying the curved steel bars. The first drive mechanism can be a rotary drive mechanism, with its output end connected to the shaft of the drive wheel 32 to achieve rotary drive.

[0054] Optionally, the bending correction mechanism 3 also includes a second drive mechanism 34, which is disposed on the bending plate 31. The output end of the second drive mechanism 34 is connected to the driven wheel 33 to drive the driven wheel 33 to slide on the bending plate 31.

[0055] like Figure 3 The second drive mechanism 34 is configured in a one-to-one correspondence with the driven wheel 33. The second drive mechanism 34 is fixed on the curved plate 31. When the second drive mechanism 34 drives the driven wheel 33 to slide on the curved plate 31, the driven wheel 33 can slide towards the driving wheel 32 and clamp the curved steel bar. Under the rotation drive of the driving wheel 32, the driving wheel 32 drives the curved steel bar to move, and the curved steel bar drives the driven wheel 33 to follow, realizing the conveying of the curved steel bar. The second drive mechanism 34 is preferably a linear drive mechanism, such as a hydraulic cylinder, a pneumatic cylinder, or a linear motor.

[0056] Optionally, the curved plate 31 is provided with a sliding groove 35, and multiple sets of sliding grooves 35 are provided. The multiple sets of sliding grooves 35 are arranged along the arc direction of the curved steel bar, and two sliding grooves 35 in each set are arranged opposite each other in a direction perpendicular to the arc direction. The driven wheel 33 is slidably connected in the sliding groove 35.

[0057] like Figure 3As shown, by setting the slide groove 35, the movement direction of the driven wheel 33 can be limited, allowing the driven wheel 33 to slide towards or away from the driving wheel 32 to improve clamping accuracy. The slide groove 35 is a straight groove, allowing the driven wheel 33 to slide in a straight line, which is convenient for control. In this embodiment, the output end of the second drive mechanism 34 is connected to the shaft of the driven wheel 33, and the space of the slide groove 35 is equal to the outer diameter of the shaft of the driven wheel 33 to provide better positioning.

[0058] Optionally, both the driving wheel 32 and the driven wheel 33 are V-shaped cross-section rollers, so that the curved steel bar can be clamped in the V-shaped groove, preventing the curved steel bar from detaching from the clamping of the driving wheel 32 and the driven wheel 33 during transportation. It can be understood that the size of the V-shaped groove of this V-section is adapted to the outer diameter of the curved steel bar, which can clamp the curved steel bar while providing a good restraining effect.

[0059] The present invention also provides a method for producing tunnel segments. According to the tunnel segment production line provided in the above embodiments, the method for producing tunnel segments includes the following steps:

[0060] S1, feeding mechanism 1 conveys straight steel bars; generally, two straight steel bars are conveyed simultaneously and synchronously, and the two straight steel bars serve as top reinforcement and bottom reinforcement respectively to facilitate the welding of planar mesh reinforcement.

[0061] S2, the bending mechanism 2 receives straight steel bars and bends them to obtain curved steel bars; the bending structure and principle of the bending mechanism 2 are existing technologies and will not be described in detail in this embodiment.

[0062] S3, the curved steel bar enters the curved straightening mechanism 3. The curved straightening mechanism 3 can further straighten the curvature of the curved steel bar, and it also has the function of clamping and conveying the curved steel bar, which facilitates the connection between the curved mechanism 2 and the planar mesh welding mechanism 4. When the curved steel bar enters the curved straightening mechanism 3, the second drive mechanism 34 drives the driven wheel 33 to slide towards the opposite drive wheel 32 to press the curved steel bar into contact with the drive wheel 32. Then, the first drive mechanism drives the drive wheel 32 to rotate, completing the conveying of the curved steel bar.

[0063] S4, the curved steel bars after curvature correction are conveyed forward and welded in the planar mesh welding mechanism 4 to obtain planar mesh steel bars. It should be noted that in this embodiment, the planar mesh welding mechanism 4 needs to be selectively configured to match specific welding requirements such as short bar welding, based on the shape of the planar mesh weld. This embodiment does not limit or describe this specific requirement. In some embodiments, the planar mesh welding mechanism 4 can perform welding and bending operations on the curved steel bars, ultimately obtaining planar mesh steel bars that meet the requirements.

[0064] S5, the cantilever gripping mechanism 6 grips the planar mesh steel bars and stacks them onto the three-dimensional mesh welding mold 5;

[0065] S6, Repeat steps S1-S5 until the three-dimensional mesh welding mold 5 has a specified number of planar mesh reinforcement bars;

[0066] S7, combine and weld a specified number of planar mesh steel bars to obtain a three-dimensional mesh steel bar. At the same time, the cantilever gripping mechanism 6 continues to grip the planar mesh steel bars and stack them onto the next three-dimensional mesh welding mold 5.

[0067] S8, proceed to step S6.

[0068] It is understood that in the shield tunnel segment production method provided in this embodiment of the invention, steps S1-S5 can be a continuous working process. By setting up a cantilever gripping mechanism 6 to continuously grip the planar mesh reinforcement, a specified number of planar mesh reinforcements are first placed into one three-dimensional mesh welding mold 5, and then the rotation direction is changed to continuously place planar mesh reinforcements into another three-dimensional mesh welding mold 5. This cycle is repeated to achieve continuous operation. In a typical production process, two three-dimensional mesh welding molds 5 can meet the feeding needs of one planar mesh welding mechanism 4, realizing continuous production without the need to store the planar mesh reinforcements before transfer or handling. Therefore, the problem of poor three-dimensional mesh reinforcement forming accuracy caused by deformation of the planar mesh reinforcements during handling is avoided. This invention helps to reduce the equipment space occupied by the production line and greatly improves production efficiency.

[0069] Optionally, in step S6, when the planar mesh reinforcement reaches the specified quantity, the welding robot 7 starts and runs to the three-dimensional mesh welding mold 5 to perform combined welding. After the combined welding is completed, the welding robot 7 runs to the next three-dimensional mesh welding mold 5 to perform combined welding.

[0070] It is understandable that using two welding robots 7 to reciprocate between two three-dimensional mesh welding molds 5 for welding not only enables two welding robots 7 to perform synchronous welding operations at one three-dimensional mesh welding mold 5 to improve welding efficiency, but also reduces the number of welding robots 7 used due to the reciprocating motion of the welding robots 7, which helps to reduce costs.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A segment production line for a tunneling shield, characterized in that The utility model relates to a kind of steel bar bending machine, including: Feeding mechanism (1) is used to provide two straight bars synchronously; Arc bending mechanism (2) is arranged at the end of the feeding mechanism (1), and the arc bending mechanism (2) is used to bend the straight bar to form arc bending steel bar; Arc correction mechanism (3) is arranged at the end of the arc bending mechanism (2), and the arc correction mechanism (3) is used to transport and correct the arc of the arc bending steel bar; Plane net welding mechanism (4) is arranged at the end of the arc correction mechanism (3), and the arc bending steel bar is welded to obtain plane net steel bar in the plane net welding mechanism (4); Stereoscopic net welding mould (5) is provided with at least two, and is arranged at the end of the plane net welding mechanism (4), and is used to combine welding to obtain stereoscopic net steel bar; Cantilever grabbing mechanism (6) is rotatably arranged between the plane net welding mechanism (4) and the stereoscopic net welding mould (5), and the cantilever grabbing mechanism (6) is used to grab and sequentially code the plane net steel bar on at least two stereoscopic net welding moulds (5); It further includes welding robot (7), the welding robot (7) is provided with at least two, and at least two welding robots (7) can reciprocate between at least two stereoscopic net welding moulds (5) to carry out the combined welding.

2. The shield segment production line according to claim 1, characterized in that It further includes robot track (8), the robot track (8) is provided with two, and two robot tracks (8) are separately arranged on the two sides of a plurality of stereoscopic net welding moulds (5), and at least one welding robot (7) is slidably connected on each robot track (8).

3. The segment production line according to claim 1, characterized in that The arc correction mechanism (3) includes: Arc plate (31); Driving wheel (32), the driving wheel (32) is provided with a plurality of, and a plurality of driving wheels (32) are arranged on the arc plate (31) along the arc direction of the arc bending steel bar, and the driving wheel (32) is rotatably installed on the arc plate (31); Driven wheel (33), the driven wheel (33) is provided with a plurality of, and a plurality of driven wheels (33) are correspondingly arranged with a plurality of driving wheels (32), the driven wheel (33) is slidably connected to the arc plate (31), and the driven wheel (33) can move towards or away from the driving wheel (32) to clamp or loosen the arc bending steel bar.

4. The shield segment production line according to claim 3, characterized in that The arc correction mechanism (3) further includes first driving mechanism, and the first driving mechanism is arranged on the arc plate (31), and the output end of the first driving mechanism is connected with the driving wheel (32) to drive the rotation of the driving wheel (32).

5. The shield segment production line according to claim 4, characterized in that The arc correction mechanism (3) further includes second driving mechanism (34), and the second driving mechanism (34) is arranged on the arc plate (31), and the output end of the second driving mechanism (34) is connected with the driven wheel (33) to drive the driven wheel (33) to slide on the arc plate (31).

6. The shield segment production line according to claim 5, characterized in that The arc bending plate (31) is provided with a sliding groove (35), the sliding groove (35) is provided with multiple groups, multiple groups of the sliding groove (35) are arranged along the arc direction of the arc bending steel bar, and each group of two sliding grooves (35) are oppositely arranged along the direction perpendicular to the arc direction, and the driven wheel (33) is slidably connected in the sliding groove (35).

7. The segment production line according to claim 3, characterized in that The driving wheel (32) and the driven wheel (33) are both V-shaped section rollers.

8. A method of segment production for a tunneling shield, characterized in that The shield segment production line according to any one of claims 1-7, the shield segment production method comprising the following steps: S1, the feeding mechanism (1) conveys the straight steel bar; S2, the arc bending mechanism (2) receives the straight steel bar and bends the straight steel bar to obtain an arc bending steel bar; S3, the arc bending steel bar enters the arc correction mechanism (3); S4, the arc bending steel bar after arc correction is conveyed forward and welded in the plane net welding mechanism (4) to obtain a plane net steel bar; S5, the cantilever grabbing mechanism (6) grabs the plane net steel bar and stacks it on the three-dimensional net welding mold (5); S6, repeating steps S1-S5 until the three-dimensional net welding mold (5) has a specified number of plane net steel bars; S7, the specified number of plane net steel bars are combined and welded to obtain a three-dimensional net steel bar, and at the same time, the cantilever grabbing mechanism (6) continues to grab the plane net steel bar and stack it on the next three-dimensional net welding mold (5); S8, executing step S6.

9. The method of producing a shield segment according to claim 8, wherein In step S6, when the plane net steel bar reaches the specified number, the welding robot (7) starts and runs to the three-dimensional net welding mold (5) for combined welding, and after the combined welding is completed, the welding robot (7) runs to the next three-dimensional net welding mold (5) for combined welding.

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