A U-shaped steel bar flipping and positioning device

Abstract

The present invention discloses a U-shaped steel bar flipping and positioning device, including a base frame, a transmission component, a flip plate component and a positioning component, wherein a transmission component is installed on one side of the base frame, the transmission component is in transmission connection with the flip plate component, a positioning component is installed in the flip plate component, and the positioning component cooperates to center and clamp the main bar. The present invention realizes automatic centering, positioning and clamping of the entire main bar, and it has the ability to semi-automatically produce main bars of various specifications or to cooperate with other automated handling and feeding equipment to achieve full-automatic production, which can significantly reduce the labor intensity and number of workers, is conducive to reducing the labor cost of enterprises, and frees workers from heavy physical labor, and its production efficiency and safety factor are also greatly improved, and it can realize accurate positioning of U-shaped steel bars on an automated production line.

Description

Technical Field

[0001] The invention relates to the technical field of building steel bar welding equipment, in particular to a U-shaped steel bar turning and positioning device. Background Art

[0002] As the skeleton of the building, the steel cage is composed of stirrups and main bars, and plays the main load-bearing role. It is used in large quantities during the construction process. The concrete has high compressive strength but low tensile strength. It plays a restraining role on the pile concrete, allowing it to withstand a certain axial tension.

[0003] At present, steel cages are mainly made by wire tying or welding. Specifically, workers assemble and move the main bars and stirrups together, and then operate welding equipment or wire tying to connect the stirrups and longitudinal bars. In most existing construction projects, steel cages have been manually wound and tied or welded after bending. The steel cages made by hand have uneven spacing, are loose, and are easily deformed, which affects the quality of the project. At the same time, they require a lot of manpower and have high processing costs. In addition, the steel cages required on the construction site are of different specifications, and manual handling is time-consuming and labor-intensive, with low work efficiency and prone to safety hazards.

[0004] With the vigorous development of intelligent buildings, the original steel cage manufacturing process can no longer meet the society's demand for steel cage processing efficiency. In order to realize the automated production of steel cages, the existing technology has evolved from changing the original double steel bars to U-shaped steel bars as the main bars. The U-shaped steel bars need to be positioned and transported before they are nested and assembled. How to accurately position the U-shaped steel bars on the automated production line is a difficult problem that needs to be overcome in the existing technology. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a U-shaped steel bar flipping and positioning device, including a base frame, a transmission assembly, a flip plate assembly and a positioning assembly. A transmission assembly is installed on one side of the base frame, and the transmission assembly is connected to the flip plate assembly in transmission. A positioning assembly is installed in the flip plate assembly, and the positioning assembly centers the main reinforcement and clamps it.

[0006] Preferably, the positioning assembly includes a main baffle, an outward push transmission positioning assembly and a flexible pushing mechanism, the main baffle is relatively installed in the flip plate assembly, the outward push transmission positioning assembly and the flexible pushing mechanism are fixedly installed on the main baffle, the outward push transmission positioning assembly includes a servo motor, a transmission pulley group, an outward push block and a screw assembly, a servo motor is fixedly installed at one end of the main baffle, the servo motor drives the transmission pulley group for transmission, the transmission pulley group is connected to the screw assembly for transmission, the screw assembly is a plurality of groups and all pass through the main baffle, and both ends of the screw assembly are fixed to the main baffle, and the outer side of the main baffle is also fixedly installed with an outward push block; the flexible pushing mechanism It includes an inner push block, a pushing device and a guide rod. A first mounting hole is provided at the upper end of the inner push block, a pushing device is passed through the first mounting hole, the pushing device includes a guide shaft, a spring and a pushing cylinder, the guide shaft passes through the first mounting hole and is movably contacted with the first mounting hole, a spring is sleeved on the guide shaft, one end of the spring is against the inner push block, and the other end is against one end of the guide shaft, a socket is provided at one end of the guide shaft, the input shaft of the pushing cylinder is inserted into the socket and fixedly connected thereto; two second mounting holes are provided in the middle part of the inner push block, a guide rod is passed through the second mounting hole, one end of the guide rod passes through the outer push block and is fixed on the outer push block.

[0007] Preferably, the flip plate assembly includes a flip frame, a mounting plate and a support assembly, the output end of the transmission assembly is fixedly connected to one end of the flip frame, a mounting plate is fixedly provided on the flip frame, one end of the mounting plate extends out of the flip frame, the bottom of the mounting plate extending out of one end of the flip frame is rotatably connected to the support assembly, and a sensor assembly is movably installed at the other end of the flip frame.

[0008] Preferably, the sensor assembly includes a first mounting rod, a fixing plate, a flip sensor, a first connecting rod, a second connecting rod, a sensing sheet and a sensing shaft, the first mounting rod is fixedly connected to the base frame, a fixing plate is fixedly mounted on the first mounting rod, a flip sensor is mounted on the fixing plate, a first connecting rod is provided above the flip sensor, a sensing sheet is longitudinally arranged on the first connecting rod, the upper end of the first connecting rod is fixedly connected to the second connecting rod, two sensing sheets are transversely arranged on the second connecting rod, one end of the second connecting rod is fixedly connected to the sensing shaft, the sensing shaft passes through the upper end of the first mounting rod and extends into the flip frame body, and the sensing shaft is rotatably connected to the flip frame body.

[0009] Preferably, the support assembly includes a support rod, a mounting block and a movable rod, the lower end of the support rod is fixedly connected to the base frame, the upper end of the support rod is fixedly provided with a mounting block, one side of the mounting block is rotatably connected to the middle part of the movable rod, and the upper end of the movable rod is fixedly connected to the bottom of the mounting plate.

[0010] Preferably, the screw assembly comprises forward and reverse screws and screw support blocks, the forward and reverse screws pass through two oppositely arranged main baffles, and the parts of the two ends of the forward and reverse screws extending out of the main baffles are installed with screw support blocks.

[0011] Preferably, the transmission pulley assembly includes a first pulley group and a second pulley group, the first pulley group and the second pulley group are respectively installed on both sides of the screw assembly, and one end of the first pulley group and the second pulley group transmit power through the same set of screw assemblies.

[0012] Preferably, the positioning assembly also includes a main rib return to zero positioning mechanism, which is fixed on the flip plate assembly, and the main rib return to zero positioning mechanism includes a return to zero cylinder, a return to zero baffle, a side positioning plate, a mounting groove and a positioning sensor. The return to zero cylinders are fixedly installed on both sides of the mounting plate, the output shaft of the return to zero cylinder is fixedly connected to the return to zero baffle, the bottom of the side positioning plate is fixedly connected to the mounting plate, a mounting groove is opened on the side positioning plate, a positioning sensor is passed through the mounting groove, and the positioning sensor is fixedly connected to the mounting groove.

[0013] Preferably, a return-to-zero cylinder groove is provided on the upper side and the side of the return-to-zero cylinder, a return-to-zero cylinder sensor is slidably connected in the return-to-zero cylinder groove, and a fixing part for fixing the return-to-zero cylinder sensor is also provided in the return-to-zero cylinder groove.

[0014] Preferably, the transmission assembly includes a reduction motor and a coupling, the output end of the reduction motor is fixedly connected to the flip frame through the coupling, and the transmission assembly can drive the flip plate assembly to rotate 0° to 90° to the left and right sides respectively.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The present invention has a simple structure. The outer push transmission positioning assembly and the flexible pushing mechanism cooperate with each other. Specifically, the screw assembly drives the outer push block to move from the outside to the inside and close together. At the same time, the pushing cylinder pushes the inner push block from the inside to the outside along the moving direction of the guide rod. The outer push block and the inner push block are relatively close to each other, and the overall thrust of the outer push block is greater than the overall thrust of the inner push block, so that the main reinforcement will not be deformed by the inner push block, thereby positioning and clamping the main reinforcement.

[0017] (2) The present invention provides a flexible pushing mechanism. When working, the pushing cylinder pushes the inner push block to make reciprocating motion. In this process, the spring acts as a buffer to prevent the hard collision between the push cylinder rod plug and the two ends of the push cylinder, thereby protecting the push cylinder from being easily damaged and assisting the automatic placement of the main reinforcement, so that the working process is smooth and does not affect the work efficiency.

[0018] (3) The present invention provides a main reinforcement zero return positioning mechanism. When the main reinforcement is sent to the flip frame and the zero return baffle connected to the zero return cylinder is pushed out through the zero point, the side positioning plates on both sides can further correct the direction of the main reinforcement. Then, the zero return cylinder is inflated and retracted, driving the main reinforcement back to the zero point, thereby achieving the effect of positioning the main reinforcement to a fixed position, and there will be no error in the placement position.

[0019] (4) Compared with the traditional production operation mode in which workers perform completely manual work, the present invention as a whole realizes automatic centering, positioning and clamping of the entire main reinforcement. It has the ability to semi-automatically produce main reinforcements of various specifications or to achieve fully automated production in conjunction with other automated handling and loading equipment. This can significantly reduce the labor intensity and number of workers, help reduce the labor costs of enterprises, free workers from heavy physical labor, and significantly improve production efficiency and safety factor. It can also realize accurate positioning of U-shaped steel bars on an automated production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is the front view of the positioning assembly of the present invention.

[0022] Figure 3 It is a rear view of the positioning assembly of the present invention.

[0023] Figure 4 It is a structural schematic diagram of the flip frame and the positioning assembly of the present invention.

[0024] Figure 5 It is a partial enlarged view of the screw assembly of the present invention.

[0025] Figure 6 It is a structural schematic diagram of the flexible pushing mechanism of the present invention.

[0026] Figure 7 For the present invention Figure 6 sectional view of .

[0027] Figure 8 It is a schematic structural diagram of the flexible pushing mechanism of the present invention when the spring is compressed.

[0028] Fig. 9 It is a rear view of the flexible pushing mechanism of the present invention.

[0029] Fig.10 It is a structural schematic diagram of the flip plate assembly of the present invention flipped 90° to the left.

[0030] Fig.11 It is a front view of the present invention.

[0031] Fig.12It is a schematic structural diagram of the sensor assembly of the present invention.

[0032] Fig.13 It is a schematic structural diagram of the return-to-zero cylinder and the return-to-zero baffle plate of the present invention when being pushed out.

[0033] Fig.14 It is a schematic structural diagram of the return-to-zero cylinder and the return-to-zero baffle plate of the present invention when they are retracted.

[0034] Fig.15 It is a partial enlarged view of the main reinforcement zero return positioning mechanism of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0036] like Figures 1 to 15 As shown, a U-shaped steel bar flip positioning device includes a base frame 1, a transmission component 2, a reduction motor 201, a coupling 202, a flip plate component 3, a flip frame 301, a mounting plate 302, a support component 303, a support rod 3031, a mounting block 3032, a movable rod 3033, a sensor component 304, a first mounting rod 3041, a fixing plate 3042, a flip sensor 3043, a first connecting rod 3044, a second connecting rod 3045, a sensor sheet 3046, an induction shaft 3047, a positioning component 4, a main baffle 401, a servo motor 402, an extrapolation block 414, a screw assembly 403, and a positive and negative screw 4 031, screw support block 4032, inner push block 404, guide rod 405, first mounting hole 406, guide shaft 407, spring 408, push cylinder 409, second mounting hole 410, first pulley group 411, second pulley group 412, main rib zero return positioning mechanism 413, zero return cylinder 4131, zero return baffle 4132, side positioning plate 4133, mounting groove 4134, positioning sensor 4135, zero return cylinder groove 4136, zero return cylinder sensor 4137, fixing part 4138, mounting block 4139, fixing nut 5, linear bearing 6, annular boss 7, support rod 8, mounting block 9, movable rod 10.

[0037] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figures 1 to 9 As shown, a transmission assembly 2 is installed on one side of the base frame 1, and the transmission assembly 2 is in transmission connection with the flip plate assembly 3. A positioning assembly 4 is installed in the flip plate assembly 3, and the positioning assembly 4 centers and clamps the main reinforcement.

[0040] like Figures 2 to 3 As shown, the positioning assembly 4 includes a main baffle 401, an outward push transmission positioning assembly and a flexible pushing mechanism. The main baffle 401 is relatively installed in the flip plate assembly 3. The outward push transmission positioning assembly and the flexible pushing mechanism are fixedly installed on the main baffle 401. The outward push transmission positioning assembly includes a servo motor 402, a transmission pulley group, an outward push block 414 and a screw assembly 403. A servo motor 402 is fixedly installed at one end of the main baffle 401. The servo motor 402 drives the transmission pulley group for transmission. The transmission pulley group is connected to the screw assembly 403 for transmission. The screw assembly 403 is a plurality of groups and all pass through the main baffle 401. Both ends of the screw assembly 403 are fixed to the main baffle 401. An outward push block 414 is also fixedly installed on the outside of the main baffle 401. The screw assembly 403 can drive the main baffle 401 to move relative to each other during the movement, so that the outward push block 414 on the main baffle 401 also moves synchronously.

[0041] like Figure 5 As shown, the screw assembly 403 includes forward and reverse screws 4031 and screw support blocks 4032. The forward and reverse screws 4031 pass through two oppositely arranged main baffles 401, and the parts of the forward and reverse screws 4031 extending out of the main baffles 401 at both ends are installed with screw support blocks 4032.

[0042] The transmission pulley assembly includes a first pulley group 411 and a second pulley group 412. The first pulley group 411 and the second pulley group 412 are respectively installed on both sides of the screw assembly 403, and one end of the first pulley group 411 and the second pulley group 412 transmit power through the same set of screw assembly 403.

[0043] The flexible pushing mechanism includes an inner pushing block 404, a pushing device and a guide rod 405. The inner pushing block 404 is arranged in a T shape. A first mounting hole 406 is opened at the upper end of the inner pushing block 404. A pushing device is inserted into the first mounting hole 406. The pushing device includes a guide shaft 407, a spring 408 and a pushing cylinder 409. The guide shaft 407 passes through the first mounting hole 406 and is in movable contact with the first mounting hole 406. A spring 408 is sleeved on the guide shaft 407. An annular boss 7 is provided at one end of the guide shaft 407. The spring 408 is provided at one end of the guide shaft 407. One end of 408 is against the annular boss 7 to stabilize the movement trajectory of spring 408. One end of spring 408 is against the inner push block 404 and the other end is against one end of guide shaft 407. The diameter of the first mounting hole 406 is smaller than the inner diameter of the spring 4, and the outer diameter of the spring 408 is smaller than the diameter of the annular boss 7. The spring 408 is fixed between the inner push block 404 and the guide shaft 407 to ensure that the guide shaft 407 can move on the movement trajectory of the spring 408 and the guide shaft 407 will not fly out of the first mounting hole 406.

[0044] A socket is provided at one end of the guide shaft 407, and the input shaft of the push cylinder 409 is inserted into the socket and fixedly connected thereto, and a thread is provided on the output shaft of the push cylinder 409, and a fixing nut 5 is provided at the connection between the output shaft of the push cylinder 409 and the guide shaft 407; two second mounting holes 410 are provided in the middle of the inner push block 404, and the two second mounting holes 410 are arranged on the same central axis, and a linear bearing 6 is installed in the second mounting hole 410, and the inner push block 404 and the guide rod 405 are movably connected through the linear bearing 6, and one end of the guide rod 405 passes through the outer push block 414 and is fixed on the outer push block 414,

[0045] The working principle of the flexible pushing mechanism is: after the production line is started, the inner pushing block 404 is pushed to do reciprocating motion under the push of the pushing cylinder 409. In this process, the spring 408 buffers the hard collision between the rod plug of the pushing cylinder 409 and the two ends of the pushing cylinder 409, protects the pushing cylinder 409 from being easily damaged, and assists the automatic placement of the main reinforcement, so that the working process is smooth and does not affect the work efficiency.

[0046] The flip plate assembly 3 includes a flip frame 301, a mounting plate 302 and a support assembly 303. The output end of the transmission assembly 2 is fixedly connected to one end of the flip frame 301. A mounting plate 302 is fixedly provided on the flip frame 301. One end of the mounting plate 302 extends out of the flip frame 301. The mounting plate 302 extends out of the bottom of one end of the flip frame 301 and is rotatably connected to the support assembly 303. A sensor assembly 304 is movably installed at the other end of the flip frame 301.

[0047] like Fig.12As shown, the sensor assembly 304 includes a first mounting rod 3041, a fixing plate 3042, a flip sensor 3043, a first connecting rod 3044, a second connecting rod 3045, a sensing sheet 3046 and a sensing shaft 3047. The first mounting rod 3041 is fixedly connected to the base frame 1, the fixing plate 3042 is fixedly mounted on the first mounting rod 3041, the flip sensor 3043 is mounted on the fixing plate 3042, and the first connecting rod 3044 is provided above the flip sensor 3043. 44, a sensing sheet 3046 is longitudinally arranged on the first connecting rod 3044, the upper end of the first connecting rod 3044 is fixedly connected to the second connecting rod 3045, two sensing sheets 3046 are transversely arranged on the second connecting rod 3045, one end of the second connecting rod 3045 is fixedly connected to the sensing shaft 3047, the sensing shaft 3047 passes through the upper end of the first mounting rod 3041 and extends into the flip frame 301, and the sensing shaft 3047 is rotatably connected to the flip frame 301.

[0048] like Figure 10 to Figure 11 As shown, the support assembly 303 includes a support rod 3031, a mounting block 3032 and a movable rod 3033. The lower end of the support rod 3031 is fixedly connected to the base frame 1, and the upper end of the support rod 3031 is fixedly provided with a mounting block 3032. One side of the mounting block 3032 is rotatably connected to the middle part of the movable rod 3033, and the upper end of the movable rod 3033 is fixedly connected to the bottom of the mounting plate 302.

[0049] like Figures 13 to 15 As shown, the positioning assembly 4 also includes a main rib zero return positioning mechanism 413, which is fixed on the flip plate assembly 3. The main rib zero return positioning mechanism 413 includes a zero return cylinder 4131, a zero return baffle 4132, a side positioning plate 4133, a mounting groove 4134 and a positioning sensor 4135. The zero return cylinder 4131 is fixedly installed on both sides of the mounting plate 302, the output shaft of the zero return cylinder 4131 is fixedly connected to the zero return baffle 4132, the bottom of the side positioning plate 4133 is fixedly connected to the mounting plate 302, the side positioning plate 4133 is provided with a mounting groove 4134, and a positioning sensor 4135 is penetrated in the mounting groove 4134. The positioning sensor 4135 is fixedly connected to the mounting groove 4134, and a return-to-zero cylinder groove 4136 is provided on the upper side and the side of the return-to-zero cylinder 4131, and a return-to-zero cylinder sensor 4137 is slidably connected in the return-to-zero cylinder groove 4136. A fixing part for fixing the return-to-zero cylinder sensor 4137 is also provided in the return-to-zero cylinder groove 4136. The return-to-zero cylinder sensor 4135 can be adjusted to a suitable position in the return-to-zero cylinder groove 4136, and then the return-to-zero cylinder sensor 4135 is fixed by the fixing part 4138. The return-to-zero cylinder sensor 4135 is used to sense whether the return-to-zero cylinder 4131 is extended or retracted, and to judge whether the working state is returned to zero.

[0050] The transmission assembly 2 includes a reduction motor 201 and a coupling 202. The output end of the reduction motor 201 is fixedly connected to the flip frame 301 through the coupling 202. The transmission assembly 2 can drive the flip plate assembly 3 to rotate 0° to 90° to the left and right sides respectively.

[0051] The working principle of the present invention is as follows: when the main reinforcement is conveyed to the flip assembly 3, the U-shaped opening is against the return-to-zero baffle 4132, and the return-to-zero baffle 4132 connected to the return-to-zero cylinder 4131 is pushed out through the zero point, and the side positioning plates 4133 on both sides can further correct the direction of the main reinforcement, and then the return-to-zero cylinder 4131 is inflated and retracted, driving the main reinforcement back to the zero point, so that the ends of the main reinforcement are aligned; at the same time, the outward push transmission positioning assembly and the flexible pushing mechanism both start to work, specifically, the screw assembly 403 drives the outward push block 414 to move from the outside to the inside, and at the same time, the pushing cylinder 409 pushes the inner push block 404 from the inside to the outside along The guide rod 405 is pushed out in the movable direction, the outer push block 414 and the inner push block 404 are relatively close to each other, and the overall thrust of the outer push block 414 is greater than the overall thrust of the inner push block 404, to ensure that the main reinforcement will not be deformed by the inner push block 404, thereby positioning and clamping the main reinforcement, and finally the transmission component 2 drives the flip plate component 3 to move. Specifically, when the flip frame 301 rotates to the preset sensing position of the sensor component 304, the reduction motor 201 stops running, and the entire flip assembly is flipped 90° (to the left or right), achieving two states of placing the main reinforcement vertically, waiting for the main reinforcement to be removed in the next step.

[0052] Compared with the traditional production operation mode in which workers perform completely manual operations, the present invention realizes automatic centering, positioning and clamping of the entire main reinforcement. It has the ability to semi-automatically produce main reinforcements of various specifications or to achieve fully automated production in conjunction with other automated handling and loading equipment. This can significantly reduce the labor intensity and number of workers, help reduce the labor costs of enterprises, free workers from heavy physical labor, and significantly improve production efficiency and safety factor, and can realize accurate positioning of U-shaped steel bars on automated production lines.

[0053] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of rights of the present invention. Therefore, modifications, equivalent changes, improvements, etc. made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A U-shaped steel bar turning and positioning device, characterized in that: The invention comprises a base frame (1), a transmission assembly (2), a flip plate assembly (3) and a positioning assembly (4); the base frame (1) is provided with a transmission assembly (2) on one side, the transmission assembly (2) is connected to the flip plate assembly (3) in a transmission manner, the flip plate assembly (3) is provided with a positioning assembly (4) in the flip plate assembly (3), the positioning assembly (4) centrally positions and clamps the main reinforcement; the positioning assembly (4) comprises a main baffle (401), an outward push transmission positioning assembly and a flexible pushing mechanism; the main baffle (401) is relatively mounted in the flip plate assembly (3); the main baffle (401) is fixedly mounted with an outward push transmission positioning assembly and a flexible pushing mechanism; the outward push transmission positioning assembly comprises a servo motor (402), a transmission pulley group, an outward push transmission positioning assembly and a flexible pushing mechanism; A push block (414) and a lead screw assembly (403), wherein a servo motor (402) is fixedly mounted on one end of the main baffle (401), the servo motor (402) drives a transmission pulley group for transmission, the transmission pulley group is in transmission connection with the lead screw assembly (403), the lead screw assembly (403) is a plurality of groups and all pass through the main baffle (401), and both ends of the lead screw assembly (403) are fixed to the main baffle (401), and an outer push block (414) is also fixedly mounted on the outer side of the main baffle (401); the flexible pushing mechanism comprises an inner push block (404), a pushing device and a guide rod (405), the upper end of the inner push block (404) is provided with a first mounting hole (406), the first mounting hole (406) 6) A pushing device is provided inside, the pushing device comprises a guide shaft (407), a spring (408) and a pushing cylinder (409); the guide shaft (407) passes through the first mounting hole (406) and is in movable contact with the first mounting hole (406); a spring (408) is sleeved on the guide shaft (407); one end of the spring (408) is abutted against the inner pushing block (404) and the other end is abutted against one end of the guide shaft (407); a plug hole is provided at one end of the guide shaft (407); an input shaft of the pushing cylinder (409) is inserted into the plug hole and is fixedly connected thereto; two second mounting holes (410) are provided in the middle of the inner pushing block (404); the second mounting holes (410) are provided with a spring (408) and a plug hole is provided at one end of the guide shaft (407); A guide rod (405) is provided, one end of the guide rod (405) passes through an outward push block (414) and is fixed on the outward push block (414); the flip plate assembly (3) comprises a flip frame (301), a mounting plate (302) and a support assembly (303); the output end of the transmission assembly (2) is fixedly connected to one end of the flip frame (301); a mounting plate (302) is fixedly provided on the flip frame (301); one end of the mounting plate (302) extends out of the flip frame (301); the bottom of the mounting plate (302) extending out of one end of the flip frame (301) is rotatably connected to the support assembly (303); and a sensor assembly (304) is movably installed on the other end of the flip frame (301);The transmission assembly (2) comprises a reduction motor (201) and a coupling (202); the output end of the reduction motor (201) is fixedly connected to the flip frame (301) via the coupling (202); the transmission assembly (2) can drive the flip plate assembly (3) to rotate 0° to 90° to the left and right sides respectively. ; 2. A U-shaped steel bar turning and positioning device according to claim 1, characterized in that: The sensor assembly (304) comprises a first mounting rod (3041), a fixing plate (3042), a flip sensor (3043), a first connecting rod (3044), a second connecting rod (3045), a sensing sheet (3046) and a sensing shaft (3047); the first mounting rod (3041) is fixedly connected to the base frame (1); the fixing plate (3042) is fixedly mounted on the first mounting rod (3041); the flip sensor (3043) is mounted on the fixing plate (3042); the first connecting rod (3044) is provided above the flip sensor (3043); 4), a sensing sheet (3046) is longitudinally arranged on the first connecting rod (3044), the upper end of the first connecting rod (3044) is fixedly connected to the second connecting rod (3045), two sensing sheets (3046) are transversely arranged on the second connecting rod (3045), one end of the second connecting rod (3045) is fixedly connected to the sensing shaft (3047), the sensing shaft (3047) passes through the upper end of the first mounting rod (3041) and extends into the flip frame (301), and the sensing shaft (3047) is rotatably connected to the flip frame (301).

3. A U-shaped steel bar turning and positioning device according to claim 2, characterized in that: The support assembly (303) comprises a support rod (3031), a mounting block (3032) and a movable rod (3033); the lower end of the support rod (3031) is fixedly connected to the base frame (1); the upper end of the support rod (3031) is fixedly provided with a mounting block (3032); one side of the mounting block (3032) is rotatably connected to the middle of the movable rod (3033); and the upper end of the movable rod (3033) is fixedly connected to the bottom of the mounting plate (302).

4. A U-shaped steel bar turning and positioning device according to claim 2, characterized in that: The lead screw assembly (403) comprises a forward and reverse lead screw (4031) and a lead screw support block (4032); the forward and reverse lead screw (4031) passes through two oppositely arranged main baffles (401); portions of both ends of the forward and reverse lead screw (4031) extending out of the main baffles (401) are mounted with lead screw support blocks (4032).

5. A U-shaped steel bar turning and positioning device according to claim 2 or 4, characterized in that: The transmission pulley assembly comprises a first pulley group (411) and a second pulley group (412); the first pulley group (411) and the second pulley group (412) are respectively installed on two sides of the screw assembly (403); and one end of the first pulley group (411) and the second pulley group (412) transmit power through the same set of screw assemblies (403).

6. A U-shaped steel bar turning and positioning device according to claim 1 or 2, characterized in that: The positioning assembly (4) further comprises a main rib zero return positioning mechanism (413), the main rib zero return positioning mechanism (413) being fixedly mounted on the flip plate assembly (3), the main rib zero return positioning mechanism (413) comprising a zero return cylinder (4131), a zero return baffle (4132), a side positioning plate (4133), a mounting groove (4134) and a positioning sensor (4135), the zero return cylinders (4131) being fixedly mounted on both sides of the mounting plate (302), the output shaft of the zero return cylinder (4131) being fixedly connected to the zero return baffle (4132), the bottom of the side positioning plate (4133) being fixedly connected to the mounting plate (302), the side positioning plate (4133) being provided with a mounting groove (4134), the mounting groove (4134) being provided with a positioning sensor (4135), and the positioning sensor (4135) being fixedly connected to the mounting groove (4134).

7. A U-shaped steel bar turning and positioning device according to claim 6, characterized in that: A return-to-zero cylinder groove (4136) is provided on the upper side and the side of the return-to-zero cylinder (4131), a return-to-zero cylinder sensor (4137) is slidably connected in the return-to-zero cylinder groove (4136), and a fixing member for fixing the return-to-zero cylinder sensor (4137) is also provided in the return-to-zero cylinder groove (4136).

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