CN114749582A - Full-automatic production device mechanism for U-shaped steel bars of box girder - Google Patents

Abstract

The invention provides a full-automatic production device mechanism for U-shaped steel bars of box girders, which belongs to the technical field of steel bar processing equipment and comprises a bending device and a placing platform for placing the steel bars, wherein the bending device comprises two first bending mechanisms and two second bending mechanisms, the first bending mechanisms comprise first workbenches and first bending assemblies arranged on the first workbenches, the second bending mechanisms comprise second workbenches and second bending assemblies arranged on the second workbenches and used for bending the steel bars, and a transfer assembly is also arranged on the first workbenches. When the staff will wait to bend the reinforcing bar and put on bending device, start the second bending mechanism earlier, buckle out the crotch with the both ends of reinforcing bar, the first bending mechanism of rethread is buckled into "U" word with the reinforcing bar, send out to placing the bench by the U shaped steel muscle after will buckling at last, the in-process of buckling need not the manual work and withholds the reinforcing bar, and has realized the automatic process of buckling of case roof beam U shaped steel bar, has and uses manpower sparingly, improves the advantage of reinforcing bar bending process efficiency.

Description

Full-automatic production device mechanism for U-shaped steel bars of box girder

Technical Field

The invention relates to the technical field of steel bar processing equipment, and discloses a full-automatic production device mechanism for U-shaped steel bars of box girders.

Background

With the investment of China in the urban road construction direction, the domestic road and bridge construction technology is continuously improved. The box girder is as the essential structure in road and bridge construction, and its manufacturing technology is constantly maturing.

There is U shaped steel muscle in the case roof beam, and U shaped steel muscle is the U type for whole, and the equal bending play in reinforcing bar both ends head has the crotch. In the prior art, workers typically bend the bars by means of a bar bender.

However, as the reinforcing steel bars are too long, workers are required to manually hold the reinforcing steel bars in the whole process of bending the reinforcing steel bars, and then the reinforcing steel bar bending machine bends the bent parts of the reinforcing steel bars one by one, which is very labor-consuming, and the reinforcing steel bars moving in bending are easy to bring potential safety hazards to the workers.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a full-automatic production device mechanism for U-shaped steel bars of box girders.

In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:

the full-automatic production device mechanism for the U-shaped steel bars of the box girder comprises a bending device and a placing platform which is positioned on one side of the bending device and used for placing the steel bars;

the bending device comprises two first bending mechanisms symmetrically arranged in the horizontal straight line direction and second bending mechanisms symmetrically arranged on two sides of the two first bending mechanisms, each first bending mechanism comprises a first workbench, a first bending assembly used for bending steel bars is arranged on each first workbench, each second bending mechanism comprises a second workbench, a second bending assembly used for bending the steel bars is vertically arranged on each second workbench in a lifting mode, and a transfer assembly used for transferring the steel bars to a placing table from the first workbench is arranged on each first workbench.

Furthermore, the first bending assembly comprises a first fixed die and a first rotating rod, the first fixed die is fixedly arranged on a first workbench, a first rotating disc is arranged on the first workbench in a rotating mode, the first rotating rod is fixedly arranged on the first rotating disc, and a first driving motor used for driving the first rotating disc to rotate around the first fixed die is arranged in the first workbench.

Further, the second bending assembly comprises a second fixed die and a second rotating rod, the second fixed die vertically ascends and descends on the second workbench, a second rotary table is rotatably arranged on the outer side of the second fixed die on the second workbench, the second rotating rod vertically ascends and descends on the second rotary table, a second driving motor used for driving the second rotary table to rotate is arranged in the second workbench, and a driving assembly used for driving the second fixed die and the second rotating rod to ascend and descend is arranged in the second workbench.

Further, the transfer assembly comprises a first installation piece and a second installation piece, the first installation piece is arranged in a first workbench in a sliding mode, a first cylinder used for driving the first installation piece to vertically slide is arranged in the first workbench, the second installation piece is arranged on the first installation piece in a horizontal sliding mode, a first driving source used for driving the second installation piece to be close to or far away from the placing platform is arranged in the first workbench, and a supporting platform used for supporting the reinforcing steel bars is arranged on one side, close to the placing platform, of the top of the second installation piece.

Furthermore, place the platform and enclose the regional of unloading of "U" word that closes, place the edge of platform and go up to be close to the regional rotation of unloading and be provided with the stripper, place bench and be provided with and be used for ordering about stripper pivoted second driving source.

Further, all be provided with clamping component on first workstation and the second workstation, clamping component includes fixing base, sliding seat and second cylinder, and fixing base and sliding seat setting are on the roof of first workstation and second workstation, and the sliding seat is located the one side that the fixing base is close to the platform of placing, and the second cylinder is used for ordering about the sliding seat and keeps away from or be close to the fixing base.

Further, the second workstation embeds has the elevating platform and is used for ordering about the vertical third cylinder that goes up and down of elevating platform, and clamping component on the second workstation sets up on the elevating platform.

Further, the lower part of the bending device is provided with a track parallel to the arrangement direction of the first workbench and the second workbench, the first workbench and the second workbench are arranged on the track in a sliding mode, and the first workbench and the second workbench are provided with limiting assemblies used for limiting the sliding of the first workbench and the second workbench.

Further, spacing subassembly includes the fourth cylinder, and fixed the setting is by the skid proof head on the piston rod of fourth cylinder, and the skid proof head can the butt on the track.

The application at least comprises the following beneficial effects:

the embodiment of the application provides a full automatic production device mechanism of case roof beam U type reinforcing bar, including the bending apparatus with be used for placing the platform of placing of reinforcing bar, the bending apparatus includes two first bending mechanism and two second bending mechanism, first bending mechanism includes first workstation and the first crooked subassembly of setting on first workstation, the second bending mechanism includes the second workstation and sets up the second crooked subassembly that is used for crooked reinforcing bar on the second workstation, still be provided with on the first workstation and transfer the subassembly.

When the staff will wait to bend the reinforcing bar and put on bending device, start two second bending mechanism earlier, buckle out the crotch with the both ends of reinforcing bar, two first bending mechanism of rethread, buckle into "U" word with the reinforcing bar, send out to placing the bench by transferring the U shaped steel muscle after the subassembly will buckle at last, the bending process in need not the manual work and holds in the palm the reinforcing bar, use manpower sparingly, realize the automatic process of buckling of case roof beam U shaped steel muscle, the machining efficiency of U shaped steel muscle has been improved.

Drawings

Fig. 1 is an overall structural schematic diagram of a full-automatic production apparatus mechanism according to an embodiment of the present application.

Fig. 2 is a schematic internal structural view of a first bending mechanism according to an embodiment of the present application.

Fig. 3 is a schematic internal structural view of a second bending mechanism according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a transfer assembly according to an embodiment of the present disclosure.

Fig. 5 is a partial structural schematic view of a placing table according to an embodiment of the present application.

Wherein, 1, bending device; 11. a first bending mechanism; 111. a first table; 112. a first flexure assembly; 1121. a first stationary mold; 1122. a first rotating lever; 1123. a first turntable; 1124. a first drive motor; 113. a transfer assembly; 1131. a first mounting piece; 1132. a second mounting piece; 1133. a first cylinder; 1134. a first drive source; 1135. a support platform; 12. a second bending mechanism; 121. a second table; 122. a second flexure assembly; 1221. a second stationary mold; 1222. a second rotating rod; 1223. a second turntable; 1224. a second drive motor; 1225. a fixed rod cylinder; 1226. a rotating rod cylinder; 13. a clamping assembly; 131. a fixed seat; 132. a movable seat; 133. a second cylinder; 134. a lifting platform; 135. a third cylinder; 14. a limiting component; 141. a fourth cylinder; 142. an anti-slip head; 2. a placing table; 21. a discharge area; 22. a stripper plate; 23. a second drive source; 3. a track.

Detailed Description

For better understanding of the technical solutions, the technical solutions will be described in detail with reference to fig. 1 to 5 and specific embodiments of the specification.

The embodiment of the application discloses full automatic production device mechanism of case roof beam U type reinforcing bar. Referring to fig. 1, 2 and 3, the production apparatus structure includes a bending apparatus 1 and a placing table 2. The bending device 1 includes two first bending mechanisms 11 and two second bending mechanisms 12, the two first bending mechanisms 11 are linearly arranged, the two first bending mechanisms 11 are symmetrical to each other, the two second bending mechanisms 12 are respectively disposed on two sides of the two first bending mechanisms 11 along the arrangement direction of the two first bending mechanisms 11, and the two second bending mechanisms 12 are symmetrical to each other. First bending mechanism 11 includes first workstation 111, is equipped with first crooked subassembly 112 on the mesa of first workstation 111, and second bending mechanism 12 includes second workstation 121, is equipped with second bending mechanism 12 on the mesa of second workstation 121, and first bending mechanism 11 and second bending mechanism 12 all are used for crooked reinforcing bar. The placing table 2 is located on one side of the bending device 1, the two first bending mechanisms 11 and the two second bending mechanisms 12 are located on the same side of the placing table 2, and the two first working tables 111 are provided with transfer assemblies 113 for transferring the reinforcing steel bars from the first working tables 111 to the placing table 2.

The staff places the reinforcing bar on first workstation 111 and second workstation 121 along the array orientation of first workstation 111 and second workstation 121, by the bent subassembly 122 of the second on two second workstations 121 with the both ends bending of reinforcing bar go out the crotch, again by the bent subassembly on two first workstations 111 with the reinforcing bar whole bending U type of becoming, the in-process of the crooked action of the bent subassembly 122 of second, the both ends of reinforcing bar are drawn together to placing 2 one side of platform, and place on placing platform 2, in order to guarantee reinforcing bar bending. After the U-shaped reinforcing bar is bent, the transfer assembly 113 on the first table 111 moves to transfer the U-shaped reinforcing bar to the placing table 2. In the whole bending process, the steel bars are not supported manually by workers, automatic bending forming of the U-shaped steel bars is achieved, operation is labor-saving and convenient, and the bending process is safe and reliable.

Referring to fig. 1 and 2, in the embodiment of the present application, the first bending assembly 112 includes a first fixing die 1121 and a first rotating rod 1122, the first fixing die 1121 is vertically and fixedly mounted on a top platform of the first workbench 111, the shape of the first fixing die 1121 is matched with the shape of a U-shaped bend at the inner side of a target U-shaped steel bar, a first rotating disc 1123 is rotatably mounted on the platform of the first workbench 111, the first rotating disc 1123 surrounds the outer side of the first fixing die 1121, the first rotating rod 1122 is mounted on the first rotating disc 1123, and a second driving source 23 for driving the first rotating disc 1123 to rotate is disposed in the first workbench 111. In the embodiment of the present application, the first driving motor 1124 may be a servo motor, and an output shaft of the first driving motor 1124 is drivingly connected to the first turntable 1123 through a gear.

When the staff is laying the reinforcing bar, place the reinforcing bar between first decide mould 1121 and first bull stick 1122, after first driving motor 1124 starts, drive first bull stick 1122 around first decide mould 1121 and rotate, because on the bending component of the remaining joint of reinforcing bar on other workstations, consequently the reinforcing bar on first workstation 111, around first decide mould 1121, rotates and is crooked along with first bull stick 1122. Through adopting controllers such as PLC to edit servo motor's rotation number of turns and slew velocity in advance, can the bending angle and the deformation rate of accurate control reinforcing bar, reinforcing bar bending is accurate.

Referring to fig. 1 and 3, in the embodiment of the present application, the second bending assembly 122 includes a second fixed mold 1221 and a second rotating rod 1222, the second fixed mold 1221 is vertically installed on a top table of the second working platform 121 in an up-and-down manner, the second fixed mold 1221 includes fixed rods respectively located at two sides of a steel bar to be bent, a second rotating plate 1223 is rotatably installed on the table of the second working platform 121, a second driving motor 1224 is disposed in the second working platform 121 and is used for driving the second rotating plate 1223 to rotate around the second fixed mold 1221, the second rotating rod 1222 is vertically movable with respect to the second rotating plate 1223, and a driving assembly for driving the second fixed mold 1221 and the second rotating rod 1222 to move up and down is disposed in the second working platform 121. Specifically, second driving motor 1224 can adopt servo motor, and drive assembly includes fixed pole cylinder 1225 and bull stick cylinder 1226, and fixed pole cylinder 1225 sets up inside second workstation 121, and the piston rod of fixed pole cylinder 1225 is vertical to be connected in the bottom of second fixed mould 1221, and bull stick cylinder 1226 fixed mounting is in the bottom of second carousel 1223, and the piston rod of the cylinder of bull stick is vertical to be connected in the bottom of second bull stick 1222.

Through placing the reinforcing bar between two fixed poles on second cover half 1221, order about second bull 1222 again and rotate around second cover half 1221 and bend out the crotch with the fixed pole of the head laminating second cover half 1221 of reinforcing bar, later, by the fixed pole cylinder 1225 among the drive assembly and the bull stick cylinder 1226 piston rod withdraw, make second cover half 1221 and second bull 1222 descend below the mesa of second workstation 121, make things convenient for first bending mechanism 11 to carry out the both ends of reinforcing bar inwards buckle when the U type is crooked to the reinforcing bar. The bending process of the U-shaped steel bar is labor-saving, and the bending process is full-automatic and smooth.

Referring to fig. 1, 2 and 4, in the present embodiment, the transfer assembly 113 on the first table 111 includes a first mounting tab 1131 and a second mounting tab 1132. Specifically, one side of the first bending assembly 112, which is located inside the first workbench 111 and close to the symmetric plane of the two first workbenches 111, is provided with a mounting plate perpendicular to the arrangement direction of the two first workbenches 111, a first slide rail is vertically mounted on the mounting plate, the first mounting piece 1131 is slidably mounted on the first slide rail, the first mounting piece 1131 is horizontally mounted with a second slide rail, and the second mounting piece 1132 is slidably mounted on the first slide rail. The first working table 111 is provided with a first cylinder 1133 for driving the first mounting plate 1131 to slide vertically, the first cylinder 1133 is fixedly connected with the first working table 111 through a bolt, and a piston rod of the first cylinder 1133 is connected with the first mounting plate 1131. A first driving source 1134 for driving the second installation piece 1132 to slide is further arranged in the first workbench 111, and a supporting platform 1135 is arranged on one side of the top of the second installation piece 1132 close to the placing platform 2, and is used for supporting the reinforcing steel bar between the first fixing mold 1121 of the first workbench 111 and the first rotating rod 1122 by using the supporting platform 1135 when the first installation piece 1131 rises and the second installation piece 1132 moves towards the placing platform 2, and can push the reinforcing steel bar to move towards the placing platform 2.

In this embodiment, the first driving source 1134 may be a servo motor, a rack is disposed on the first mounting plate 1131 along the length direction of the second slide rail, and the first driving source 1134 is engaged with the rack through a gear to drive the second mounting plate 1132 to move horizontally relative to the first mounting plate 1131. In other embodiments, the sliding directions of the first mounting pieces 1131 and the second mounting pieces 1132 can be exchanged, and the sliding manners of the first mounting pieces 1131 and the second mounting pieces 1132 can be driven in various combinations. For example, in one embodiment, the first mounting plate 1131 may be slidably mounted on a mounting plate in the first working platform 111 along a horizontal direction, the second mounting plate 1132 may be slidably mounted on the first mounting plate 1131 along a vertical direction, and both the first mounting plate 1131 and the second mounting plate 1132 may be slid by an air cylinder.

In this embodiment, after the first bending mechanism 11 and the second bending mechanism 12 complete the bending operation of the steel bars, an operator starts the first cylinder 1133 and the first driving source 1134 in sequence through programming of a PLC or a computer, so that the second mounting piece 1132 on the first workbench 111 is lifted, the steel bars bent between the first fixing mold 1121 and the second rotating rod 1222 on the first workbench 111 are lifted upwards by using the supporting platform 1135 on the second mounting piece 1132, then the second mounting piece 1132 moves towards the placing platform 2 and sends the steel bars to the placing platform 2, finally, the first cylinder 1133 and the first driving source 1134 are reset in sequence, and the second mounting piece 1132 returns to the original position in the first workbench 111 after placing the steel bars on the placing platform 2. The reinforcing bar is transferred through transferring the subassembly 113, reducible staff's work load, and in time empty the reinforcing bar on the bending apparatus 1, also can be convenient for the staff to continue crooked next reinforcing bar, improve reinforcing bar bending efficiency.

Referring to fig. 1 and 5, in the embodiment of the present application, the placing table 2 is composed of a plurality of placing table tops, the plurality of placing table tops enclose a "U" shape, and a discharge area 21 of the U-shaped steel bar is provided in an opening area of the "U" shape. In order to store the U-shaped reinforcing steel bars into the discharging area 21 one by one, a discharging plate 22 is rotatably mounted at the edge of the placing table 2 near the discharging area 21, and a second driving source 23 for driving the discharging plate 22 to rotate is arranged on the placing table 2. The second driving source 23 may be a motor that is connected to the rotation shaft of the discharge plate 22 through a gear transmission so as to rotate the discharge plate 22. The second driving source 23 can also be a cylinder, and is hinged below the placing table 2 through the cylinder, and a piston rod of the cylinder is hinged at the movable end of the discharging plate 22, so that the discharging plate 22 is driven to rotate up and down by the expansion and contraction of the piston rod of the cylinder. In this application embodiment, second driving source 23 is the cylinder, and the cylinder can provide more stable holding power, and the support is placed the U shaped steel muscle on the platform 2 and is more stable.

In order to further improve the safety of the bending apparatus 1 during the process of bending the steel bar and the accuracy of bending the steel bar, in the embodiment of the present application, the clamping assemblies 13 are disposed on the first working table 111 and the second working table 121. The clamping assembly 13 includes a fixed base 131, a movable base 132 and a second cylinder 133, the fixed base 131 and the movable base 132 are arranged horizontally perpendicular to the arrangement direction of the first workbench 111 and the second workbench 121, a piston rod of the second cylinder 133 is connected to one side of the movable base 132 far away from the fixed base 131, and the second cylinder 133 is used for driving the movable base 132 to be close to or far away from the fixed base 131. In particular, the clamping assemblies 13 of the two first tables 111 are located on the side of the first bending assembly 112 close to the symmetry plane, and the clamping assemblies 13 of the two second tables 121 are located on the side of the second bending assembly 122 close to the symmetry plane.

When the staff placed the reinforcing bar on first workstation 111 and second workstation 121, made the reinforcing bar be located between fixing base 131 and the sliding seat 132 simultaneously, restart second cylinder 133, the promotion sliding seat 132 of second cylinder 133 removes to fixing base 131 to it is tight with the reinforcing bar clamp between fixing base 131 and the sliding seat 132. After clamping the reinforcing bar, carry out the bending operation to the reinforcing bar again, effectively prevent that the reinforcing bar from bursting out from crooked subassembly in bending process, improved the security of apparatus for producing structure.

Further, in the second workstation 121, still be equipped with elevating platform 134, vertically install third cylinder 135 in the second workstation 121, the piston rod of third cylinder 135 is connected with elevating platform 134, and the clamping component 13 on the second workstation 121 is established on elevating platform 134. Specifically, the fixed base 131 and the second cylinder 133 are both fixedly connected to the lifting table 134 by bolts, and the movable base 132 is perpendicular to the arrangement direction of the first working table 111 and the second working table 121 and is horizontally slidably mounted on the lifting table 134. Under program control, before the steel bar is bent, the second cylinder 133 on the second worktable 121 is started to clamp the steel bar on the second worktable 121, and then the steel bar on the second worktable 121 is bent to form a hook. Afterwards, the second cylinder 133 on the second workbench 121 is reset to release the steel bar, the first cylinder 1133 on the first workbench 111 acts to clamp the steel bar, and the piston rod of the third cylinder 135 in the second workbench 121 is retracted to make the fixed seat 131 and the movable seat 132 on the surface of the second workbench 121 sink below the top surface of the second workbench 121, so that the fixed seat 131 or the movable seat 132 on the second workbench 121 can be effectively prevented from blocking the steel bar in the process of bending the steel bar into a U shape by the first bending mechanism 11. The automation degree of the steel bar bending full-automatic production device mechanism is improved.

Further, a rail 3 parallel to the arrangement direction of the first table 111 and the second table 121 is disposed below the bending apparatus 1, and both the first table 111 and the second table 121 are slidably disposed on the rail 3. The bending position of the bending device 1 on the steel bar can be adjusted by sliding the first workbench 111 or the second workbench 121 on the rail 3, so that the U-shaped steel bars with different sizes can be produced, and the applicability is improved.

In order to limit and fix the first workbench 111 and the second workbench 121 on the track 3, a limiting component 14 for limiting the sliding of the first workbench 111 and the second workbench 121 is further arranged on the first workbench 111 and the second workbench 121. In the embodiment of the present application, the limiting assembly 14 includes a fourth cylinder 141, the fourth cylinder 141 is fixed on the first workbench 111 and the second workbench 121 through bolts, a piston head of the fourth cylinder 141 vertically faces the track 3, a piston rod of the fourth cylinder 141 is connected with an anti-slip head 142, and the anti-slip head 142 may be made of rubber. After the staff moves first workstation 111 and second workstation 121 to suitable position, start fourth cylinder 141, can support tight track 3 through skid-proof head 142 to first workstation 111 of restriction or second workstation 121 move on track 3, spacing effect is reliable, and spacing easy operation is quick.

The working process of the invention is as follows: the worker manually puts the reinforcing bars to be bent into the bending apparatus 1 while positioning the reinforcing bars between the first fixed molds 1121 and the first rotating rods 1122 on the two first working tables 111 and between the second fixed molds 1221 and the second rotating rods 1222 on the two second working tables 121. Then, the worker manually activates or program-controls the second driving motor 1224 on the second table 121 to rotate the second rotating rod 1222 around the second fixed mold 1221 to bend the two ends of the reinforcing bar out of the hooks. Then, the fixed rod cylinder 1225 and the rotating rod cylinder 1226 in the second working table 121 operate to lower the second fixed mold 1221 and the second rotating rod 1222 below the top surface of the second working table 121, and then the first driving motor 1124 is activated to drive the first rotating rod 1122 on the first working table 111 to rotate around the first fixed mold 1121 so as to bend the reinforcing steel bar into a "U" shape. Finally, the first cylinder 1133 and the second drive in the first workbench 111 act simultaneously to lift the steel bar on the first workbench 111 from between the first fixing die 1121 and the first rotating rod 1122, and the steel bar is conveyed to the placing table 2, so that the whole bending and placing operation of the U-shaped steel bar is completed, the steel bar does not need to be continuously lifted by workers, the labor is saved, and the automatic process of bending and forming the steel bar is realized.

It should be apparent to those skilled in the art that while the preferred embodiments of the present invention have been described, additional variations and modifications in these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the machine equivalent technology of the claims of the present invention, it is intended that the present invention also include such modifications and variations.

Claims (9)

1. The utility model provides a full automatic production device mechanism of case roof beam U type reinforcing bar which characterized in that: comprises a bending device (1) and a placing platform (2) which is positioned at one side of the bending device (1) and used for placing reinforcing steel bars;

the bending device (1) comprises two first bending mechanisms (11) symmetrically arranged in the horizontal straight line direction and second bending mechanisms (12) symmetrically arranged on two sides of the two first bending mechanisms (11), each first bending mechanism (11) comprises a first workbench (111), a first bending assembly (112) used for bending the steel bars is arranged on each first workbench (111), each second bending mechanism (12) comprises a second workbench (121), a second bending assembly (122) used for bending the steel bars is vertically arranged on each second workbench (121) in a lifting mode, and a transfer assembly (113) used for transferring the steel bars from the first workbench (111) to the placing table (2) is arranged on each first workbench (111).

2. The mechanism for the full-automatic production device of the U-shaped steel bars of the box girder according to claim 1, wherein the first bending assembly (112) comprises a first fixed die (1121) and a first rotating rod (1122), the first fixed die (1121) is fixedly arranged on the first workbench (111), a first rotating disc (1123) is rotatably arranged on the first workbench (111), the first rotating rod (1122) is fixedly arranged on the first rotating disc (1123), and a first driving motor (1124) for driving the first rotating disc (1123) to rotate around the first fixed die (1121) is arranged in the first workbench (111).

3. The mechanism of the full-automatic production device of the U-shaped steel bars of the box girders is characterized in that the second bending assembly (122) comprises a second fixed die (1221) and a second rotating rod (1222), the second fixed die (1221) is vertically arranged on the second workbench (121) in a lifting manner, a second rotating disc (1223) is rotatably arranged on the second workbench (121) and positioned outside the second fixed die (1221), the second rotating rod (1222) is vertically arranged on the second rotating disc (1223) in a lifting manner, a second driving motor (1224) for driving the second rotating disc (1223) to rotate is arranged in the second workbench (121), and a driving assembly for driving the second fixed die (1221) and the second rotating rod (1222) to lift is arranged in the second workbench (121).

4. The mechanism for the full-automatic production device of the U-shaped steel bars of the box girders according to claim 1, wherein the transfer assembly (113) comprises a first installation piece (1131) and a second installation piece (1132), the first installation piece (1131) is slidably arranged in a first workbench (111), a first air cylinder (1133) for driving the first installation piece (1131) to vertically slide is arranged in the first workbench (111), the second installation piece (1132) is horizontally slidably arranged on the first installation piece (1131), a first driving source (1134) for driving the second installation piece (1132) to be close to or far away from the placing platform (2) is arranged in the first workbench (111), and a supporting platform (1135) for supporting the steel bars is arranged on one side, close to the placing platform (2), of the top of the second installation piece (1132).

5. The mechanism for the full-automatic production device of the U-shaped steel bars of the box girders is characterized in that the placing platform (2) encloses a U-shaped unloading area (21), an unloading plate (22) is rotatably arranged on the edge of the placing platform (2) close to the unloading area (21), and a second driving source (23) for driving the unloading plate (22) to rotate is arranged on the placing platform (2).

6. The full-automatic production device mechanism for the U-shaped steel bars of the box girders according to claim 1 is characterized in that clamping assemblies (13) are arranged on the first workbench (111) and the second workbench (121), each clamping assembly (13) comprises a fixed seat (131), a movable seat (132) and a second air cylinder (133), the fixed seats (131) and the movable seats (132) are arranged on the top walls of the first workbench (111) and the second workbench (121), and the second air cylinders (133) are used for driving the movable seats (132) to be far away from or close to the fixed seats (131).

7. The mechanism for the full-automatic production device of the U-shaped steel bars of the box girder according to claim 6, characterized in that a lifting platform (134) and a third air cylinder (135) for driving the lifting platform (134) to vertically lift are arranged in the second working platform (121), and the clamping assembly (13) on the second working platform (121) is arranged on the lifting platform (134).

8. The full-automatic production device mechanism for the U-shaped steel bars of the box girder according to claim 1, wherein a track (3) parallel to the arrangement direction of the first workbench (111) and the second workbench (121) is arranged below the bending device (1), the first workbench (111) and the second workbench (121) are arranged on the track (3) in a sliding manner, and the first workbench (111) and the second workbench (121) are respectively provided with a limiting component (14) for limiting the sliding of the first workbench (111) and the second workbench (121).

9. The full-automatic production device mechanism for U-shaped steel bars of box girders according to claim 8, wherein the limiting component (14) comprises a fourth cylinder (141), a piston rod of the fourth cylinder (141) is fixedly provided with an anti-skid head (142), and the anti-skid head (142) can abut against the rail (3).

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