Automatic conveying and positioning device for precast beam production and using method of automatic conveying and positioning device

Abstract

The invention relates to the technical field of precast beam production, in particular to an automatic conveying and positioning device for precast beam production and a using method thereof.The automatic conveying and positioning device comprises a numerical control machine tool, a conveying crawler belt is in transmission connection with the interior of the numerical control machine tool, and a control assembly mechanism is slidably connected to the upper surface of the numerical control machine tool; the surface of the conveying crawler belt is fixedly connected with a closed-loop mechanism used for conveying and fixing the precast beam steel bars, a locking mechanism used for preventing the closed-loop mechanism from rotating is arranged between the control assembly mechanism and the closed-loop mechanism, and the lower surface of the numerical control machine tool is fixedly connected with a layer-by-layer unlocking mechanism used for positioning and placing the steel bars. According to the device, the spline telescopic rods rotate to drive the pinions to rotate, the two pinions rotate through the transmission belts, and the pinions rotate to drive the semicircular teeth to rotate in the rotating wheel sliding grooves, so that the semicircular rings are opened, the reinforcing steel bars needing to be sequentially placed one by one are placed at the first position, positioning placement is completed, and accurate positioning is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated beam production, and in particular to an automatic conveying and positioning device for prefabricated beam production and a use method thereof. Background Art

[0002] With the acceleration of the process of building industrialization and urbanization, precast beams have been widely used in bridge construction, building structures and other fields. The traditional production method of precast beams has many disadvantages, such as low production efficiency, high labor intensity, unstable product quality, etc. In order to improve the production quality and efficiency of precast beams and reduce costs, automated production technology has gradually been applied to the production of precast beams.

[0003] In the prior art, it is necessary to manually place the steel bars into the mold of the precast beam and then cast them. Although this positioning is more accurate, the molds of the precast beams are mostly large and long, and the work efficiency is low. Long-term manual work will easily lead to mistakes, which will affect the work progress and cause a decline in product quality. Summary of the invention

[0004] The object of the present invention is to provide an automatic conveying and positioning device for prefabricated beam production and a method for using the same, so as to solve the problems raised in the above background technology. To achieve the above object, the present invention provides the following technical solutions: an automatic conveying and positioning device for prefabricated beam production, comprising a numerically controlled machine tool, the internal transmission of the numerically controlled machine tool is connected with a transport crawler, the upper surface of the numerically controlled machine tool is slidably connected with a control assembly mechanism, the surface of the transport crawler is fixedly connected with a closed-loop mechanism for transporting and fixing prefabricated beam steel bars, a locking mechanism for preventing the closed-loop mechanism from rotating is arranged between the control assembly mechanism and the closed-loop mechanism, the lower surface of the numerically controlled machine tool is fixedly connected with a layer-by-layer unlocking mechanism for positioning and placing steel bars, the surface of the numerically controlled machine tool is fixedly connected with a return mechanism for controlling the reset of the layer-by-layer unlocking mechanism, the surface of the numerically controlled machine tool is fixedly connected with a reset chute for controlling the restoration of the assembly mechanism, the upper surface of the numerically controlled machine tool is fixedly connected with a rack 1, and the lower surface of the numerically controlled machine tool is fixedly connected with a rack 2.

[0005] Preferably, the control assembly mechanism includes a sliding rod, which is slidably connected to the side surface of the CNC machine tool, the top of the sliding rod is fixedly connected to a fixed box, the interior of the fixed box is slidably connected to a spline telescopic rod, the surface of the spline telescopic rod is rotatably connected to a moving rod, and the moving rod is simultaneously slidably connected to the interior of the fixed box, one end of the spline telescopic rod is fixedly connected to a gear, one end of the gear is fixedly connected to a push rod, the push rod is only provided on the first gear in multiple groups of gears, oblique grooves are provided on both sides of the fixed box, the lower end of the moving rod is fixedly connected to a cross bar, the lower end of the cross bar is slidably connected to an extrusion rod, and the extrusion rod is simultaneously slidably connected to the surface of the sliding rod.

[0006] Preferably, the closed-loop mechanism includes a U-shaped support frame fixedly connected to the surface of the transport track. A semi-circular ring is fixedly connected to the surface of the U-shaped support frame. A runner chute is rotatably connected to the surface of the semi-circular ring. A semi-circular gear is slidably connected inside the runner chute. A small gear is rotatably connected to the surface of the semi-circular ring. There are two groups of small gears, and the two small gears are connected by a transmission belt. The axle core of one of the small gears is fixedly connected to the other end of the spline telescopic rod.

[0007] Preferably, the locking mechanism includes a snap ring fixedly connected to the other side of the semi-circular ring. A spring groove is fixedly connected to the surface of the non-telescopic end of the spline telescopic rod. A locking tooth is slidably connected inside the spring groove. The locking tooth meshes with the snap ring.

[0008] Preferably, the return mechanism includes a sliding block slidably connected to the side of the upper surface of the numerical control machine. A caliper rod is slidably connected inside the sliding block. An L-shaped extrusion rod is fixedly connected to the surface of the numerical control machine. The L-shaped extrusion rod and the sliding block are arranged on the same horizontal line. A spring is arranged between the inside of the sliding block and the caliper rod. A notch rod is fixedly connected to the surface of the sliding block. A connecting rod is rotatably connected to the side of the numerical control machine through a torsion spring rod. The upper end of the connecting rod is slidably connected inside the notch rod.

[0009] Preferably, the layer-by-layer unlocking mechanism includes a limit slide rail fixed to the side of the numerical control machine. A sliding connecting rod is slidably connected inside the limit slide rail. A connecting rod is movably connected to the surface of the sliding connecting rod. There are multiple groups of sliding connecting rods, and the connecting rod is only arranged on the upper surface of the first sliding connecting rod. A spring rod is rotatably connected to the side of the numerical control machine. The upper end of the spring rod is fixedly connected to a connecting rod. The sliding connecting rod is slidably connected inside the connecting rod. The lower end of the spring rod is fixedly connected to an inclined panel.

[0010] Preferably, a notch is opened at the lower end of the sliding connecting rod. Multiple groups of sliding connecting rods are connected together by a telescopic rod. A rotating rod one is rotatably connected to the lower end of the limit slide rail. One end of the rotating rod one is slidably connected inside the notch.

[0011] The usage method of the automatic conveying and positioning device for precast beam production includes the following steps: S1. First, fix and position the steel bars required for the precast beam through the closed-loop mechanism, and then cooperate with the transport track on the numerical control machine for conveying. During the movement of the closed-loop mechanism, the steel bars placed on the surface can be fixed, preparing for the next precise placement; S2. After the steel bars are placed on the closed-loop mechanism through the second rack, the first closed-loop mechanism is misaligned with the next layer-by-layer unlocking mechanism through the layer-by-layer unlocking mechanism, so that the sorting and placement of the steel bars on the layer-by-layer unlocking mechanism and the next closed-loop mechanism will not be affected. S3. Finally, the caliper rod is squeezed by the L-shaped extrusion rod, and the caliper rod will be squeezed into the inside of the sliding block. Then the push rod will slide over the upper end of the L-shaped extrusion rod. When the connecting rod rotates, the lower end will drive the sliding link to reset, and the other sliding links will be reset in sequence through the telescopic rod to realize cyclic operation, improving work efficiency.

[0012] In the present invention, when the spline telescopic rod rotates, it drives the small gear to rotate. The two small gears rotate through the transmission belt. When the small gear rotates, it drives the semi-circular teeth to rotate inside the runner chute, so that the semi-circular ring opens. The steel bars that need to be sorted and placed one by one are placed in the first position to complete the positioning placement and achieve precise positioning.

[0013] In the present invention, when the semi-circular ring closes, the steel bars are locked inside the circle. At the same time, when the spline telescopic rod rotates, it drives the teeth in the spring groove to rotate simultaneously. The teeth will rotate inside the snap ring and can only rotate forward, preventing the spline telescopic rod from rotating back, ensuring the stability of the steel bars inside the semi-circular ring and the semi-circular teeth.

[0014] In the present invention, when the caliper rod is squeezed by the L-shaped extrusion rod, the caliper rod will be squeezed into the inside of the sliding block. The push rod will slide over the upper end of the L-shaped extrusion rod. When the connecting rod rotates, the lower end will drive the sliding link to reset, and the other sliding links will be reset in sequence through the telescopic rod to realize cyclic operation, improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional external view schematic diagram of the present invention; Figure 2 is a schematic diagram of the side sectional structure of the present invention; Figure 3 is a schematic diagram of the enlarged structure on one side of the numerical control machine tool of the present invention; Figure 4 is a schematic diagram of the enlarged structure on the other side of the numerical control machine tool of the present invention; Figure 5 is a schematic diagram of the structure of the control assembly mechanism of the present invention; Figure 6 is a schematic diagram of the side sectional structure of the control assembly mechanism of the present invention; Figure 7 is a schematic diagram of the enlarged partial structure of the control assembly mechanism of the present invention; Figure 8 is a schematic diagram of the structure of the closed-loop mechanism of the present invention; Figure 9 is of the present invention Figure 6 enlarged structure schematic diagram of A; Figure 10 Structural schematic diagram of the return mechanism of the present invention; Figure 11 Structural schematic diagram of the layer-by-layer unlocking mechanism of the present invention; Figure 12 Partial enlarged structural schematic diagram of the layer-by-layer unlocking mechanism of the present invention; Figure 13 Bottom view structural schematic diagram of the layer unlocking mechanism of the present invention.

[0016] In the figure: 1, numerical control machine tool; 2, transport track; 3, control assembly mechanism; 4, closed-loop mechanism; 5, locking mechanism; 6, return mechanism; 7, layer-by-layer unlocking mechanism; 8, reset chute; 9, rack one; 10, rack two; 31, sliding rod; 32, fixed box; 33, spline telescopic rod; 34, moving rod; 35, gear; 36, push rod; 37, chute; 38, cross bar; 39, extrusion rod; 41, U-shaped support frame; 42, semi-circular ring; 43, runner chute; 44, semi-circular tooth; 45, pinion; 46, transmission belt; 51, snap ring; 52, spring groove; 53, locking tooth; 61, sliding block; 62, caliper rod; 63, L-shaped extrusion rod; 64, spring; 65, notch rod; 66, connecting rod; 71, limit slide rail; 72, sliding connecting rod; 73, spring rod; 74, inclined panel; 75, connecting rod; 76, rotating rod one; 77, notch; 78, telescopic rod. Specific implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1 to 13 , the present invention provides a technical solution: an automatic conveying and positioning device for precast beam production, including a numerical control machine tool 1, a transport track 2 is internally connected to the numerical control machine tool 1 in a transmission manner, a control assembly mechanism 3 is slidably connected to the upper surface of the numerical control machine tool 1, a closed-loop mechanism 4 for transporting and fixing precast beam steel bars is fixedly connected to the surface of the transport track 2, a locking mechanism 5 for preventing the closed-loop mechanism 4 from rotating is arranged between the control assembly mechanism 3 and the closed-loop mechanism 4, a layer-by-layer unlocking mechanism 7 for positioning and placing steel bars is fixedly connected to the lower surface of the numerical control machine tool 1, a return mechanism 6 for controlling the reset of the layer-by-layer unlocking mechanism 7 is fixedly connected to the surface of the numerical control machine tool 1, a reset chute 8 for restoring the control assembly mechanism 3 is fixedly connected to the surface of the numerical control machine tool 1, a rack one 9 is fixedly connected to the upper surface of the numerical control machine tool 1, and a rack two 10 is fixedly connected to the lower surface of the numerical control machine tool 1.

[0019] The control assembly mechanism 3 includes a sliding rod 31, which is slidably connected to the side of the surface of the CNC machine tool 1, and a fixed box 32 is fixedly connected to the top of the sliding rod 31, and a spline telescopic rod 33 is slidably connected inside the fixed box 32. A moving rod 34 is rotatably connected to the surface of the spline telescopic rod 33, and the moving rod 34 is also slidably connected inside the fixed box 32. One end of the spline telescopic rod 33 is fixedly connected to a gear 35, and one end of the gear 35 is fixedly connected to a push rod 36, and the push rod 36 is only provided on the first gear 35 of the multiple sets of gears 35. Oblique grooves 37 are provided on both sides of the fixed box 32, and a cross bar 38 is fixedly connected to the lower end of the moving rod 34, and an extrusion rod 39 is slidably connected to the lower end of the cross bar 38, and the extrusion rod 39 is also slidably connected to the surface of the sliding rod 31.

[0020] The closed-loop mechanism 4 includes a U-shaped support frame 41, which is fixedly connected to the surface of the transport crawler 2. A semicircular ring 42 is fixedly connected to the surface of the U-shaped support frame 41. The surface of the semicircular ring 42 is rotatably connected to a runner slot 43. The inside of the runner slot 43 is slidably connected to a semicircular tooth 44. The surface of the semicircular ring 42 is rotatably connected to a pinion 45. Two groups of pinions 45 are arranged in total, and the two pinions 45 are connected by a transmission belt 46. The shaft core of one of the pinions 45 is fixedly connected to the other end of the spline telescopic rod 33, and the pinion 45 is driven to rotate when the spline telescopic rod 33 rotates. The two pinions 45 rotate through the transmission belt 46. When the pinion 45 rotates, it drives the semicircular tooth 44 to rotate inside the runner slot 43, so that the semicircular ring 42 is opened, and the steel bars that need to be sorted and placed one by one are placed in the first position, completing the positioning and placement, and achieving precise positioning.

[0021] The locking mechanism 5 includes a snap ring 51, which is fixedly connected to the other side of the semicircular ring 42. A spring groove 52 is fixedly connected to the non-retractable end surface of the spline telescopic rod 33. A latch tooth 53 is slidably connected inside the spring groove 52. The latch tooth 53 is meshed with the snap ring 51, and the semicircular ring 42 is closed to lock the steel bar in the circle. At the same time, when the spline telescopic rod 33 rotates, the latch tooth 53 in the spring groove 52 is driven to rotate at the same time. The latch tooth 53 will rotate inside the snap ring 51 and can only rotate forward to prevent the spline telescopic rod 33 from rotating, thereby ensuring the stability of the steel bars in the semicircular ring 42 and the semicircular tooth 44.

[0022] The return mechanism 6 includes a sliding block 61 which is slidably connected to the side of the upper surface of the numerical control machine tool 1. A caliper rod 62 is slidably connected inside the sliding block 61. An L-shaped extrusion rod 63 is fixedly connected to the surface of the numerical control machine tool 1. The L-shaped extrusion rod 63 and the sliding block 61 are arranged on the same horizontal line. A spring 64 is arranged between the inside of the sliding block 61 and the caliper rod 62. A notch rod 65 is fixedly connected to the surface of the sliding block 61. A connecting rod 66 is rotatably connected to the side of the numerical control machine tool 1 through a torsion spring rod. The upper end of the connecting rod 66 is slidably connected inside the notch rod 65.

[0023] The layer-by-layer unlocking mechanism 7 includes a limit slide rail 71 which is fixed to the side of the numerical control machine tool 1. A sliding connecting rod 72 is slidably connected inside the limit slide rail 71. The surface of the sliding connecting rod 72 is movably connected to the connecting rod 66. Multiple groups of sliding connecting rods 72 are provided, and the connecting rod 66 is only arranged on the upper surface of the first sliding connecting rod 72. A spring rod 73 is rotatably connected to the side of the numerical control machine tool 1. The upper end of the spring rod 73 is fixedly connected to a connecting rod 75. The sliding connecting rod 72 is slidably connected inside the connecting rod 75. The lower end of the spring rod 73 is fixedly connected to an inclined panel 74. A notch 77 is opened at the lower end of the sliding connecting rod 72. Multiple groups of sliding connecting rods 72 are connected together through a telescopic rod 78. A rotating rod one 76 is rotatably connected to the lower end of the limit slide rail 71. One end of the rotating rod one 76 is slidably connected inside the notch 77. When the caliper rod 62 is squeezed by the L-shaped extrusion rod 63, the caliper rod 62 will be squeezed into the inside of the sliding block 61, and the push rod 36 will slide over the upper end of the L-shaped extrusion rod 63. When the connecting rod 66 rotates, the lower end will drive the sliding connecting rod 72 to reset, and the other sliding connecting rods 72 are sequentially reset through the telescopic rod 78 to realize cyclic operation, improving the work efficiency.

[0024] The usage method and advantages of the present invention: The usage method of the automatic conveying and positioning device for precast beam production is as follows. During use, the working process is as follows: As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 shown; S1. First, place the steel bars required for the precast beam on the surfaces of a pair of open semi-circular rings 42. At the same time, place the precast beam mold directly below the numerical control machine tool 1. Then, drive the transport track 2 to operate through the numerical control machine tool 1. When the transport track 2 is driven, it drives the semi-circular ring 42 on the U-shaped support frame 41 to move. The semi-circular ring 42 drives the fixed box 32 to move through the spline telescopic rod 33. The fixed box 32 moves along the side of the numerical control machine tool 1 through the sliding rod 31. The spline telescopic rod 33 also drives the gear 35 to move until it meshes with the first rack 9. Through the first rack 9, the gear 35 rotates. When the gear 35 rotates, it drives the spline telescopic rod 33 to rotate. When the spline telescopic rod 33 rotates, it drives the small gear 45 to rotate. The two small gears 45 rotate through the transmission belt 46. When the small gear 45 rotates, it drives the semi-circular teeth 44 to rotate inside the runner chute 43, causing the semi-circular ring 42 to close and lock the steel bars inside the circle. At the same time, when the spline telescopic rod 33 rotates, it drives the latch teeth 53 in the spring groove 52 to rotate simultaneously. The latch teeth 53 will rotate inside the snap ring 51 and can only rotate forward, preventing the spline telescopic rod 33 from rotating back, ensuring the stability of the steel bars inside the semi-circular ring 42 and the semi-circular teeth 44; S2. When the semicircular ring 42 and the semicircular tooth 44 move to the lower end of the prefabricated beam mold on the lower surface of the CNC machine tool 1 through the transport crawler 2, they first mesh with the rack 2 10, and drive the gear 35 to rotate again. When the gear 35 rotates, it drives the spline telescopic rod 33 to rotate. When the spline telescopic rod 33 rotates, it drives the pinion 45 to rotate. The two pinions 45 rotate through the transmission belt 46. When the pinion 45 rotates, it drives the semicircular tooth 44 to rotate inside the rotating wheel slot 43, so that the semicircular ring 42 is opened, and the steel bars that need to be placed one by one are placed in the first position. After the positioning and placement are completed, the moving rod 34 will be squeezed by the inclined plate 74. When the moving rod 34 is squeezed, it will drive the spline telescopic rod 33 to shrink in the fixed box 32. When the spline telescopic rod 33 shrinks, it will drive the gear 35 to move at the same time, so that it will be staggered with other racks 2 10. At the same time, when the moving rod 34 moves, it drives the lower end of the cross bar 38 to move at the same time. The cross bar 38 is inside the inclined slot 37 When the moving rod 34 slides over the inclined plate 74, the extrusion rod 39 will squeeze the rotating rod 76. When one end of the rotating rod 76 is squeezed, it will rotate through the middle end of the limiting slide rail 71 as the axis. When the rotating rod 76 rotates, the other end will squeeze the sliding link 72 through the notch 77. When the sliding link 72 is squeezed, it will slide inside the limiting slide rail 71 and squeeze the link 75. When the link 75 is squeezed, it will quickly rotate through the spring rod 73. When the spring rod 73 rotates, it drives the inclined plate 74 to rotate. The first group of inclined plates 74 will rotate and will be misaligned with the next moving rod 34. When the sliding link 72 moves, it drives the telescopic end of the telescopic rod 78 to unfold, and the second group of sliding links 72 will be in a stationary state. S3, when the next group of steel bars moves over, it will be misaligned with the inclined plate 74 of the first group, and at the same time, the extrusion rod 39 will be misaligned with one end of the rotating rod 1 76 until it meshes with the second rack 2 10, and the above steps will be repeated in sequence to position each steel bar one by one and lower it into the precast beam mold to achieve accurate positioning. After the first group of semicircular rings 42 and semicircular teeth 44 complete the cycle operation, the push rod 36 on the surface of the gear 35 will squeeze the caliper rod 62, the caliper rod 62 drives the sliding block 61 to move, the sliding block 61 drives the notch rod 65 to move, the notch rod 65 drives the connecting rod 66 to rotate, and the connecting rod 66 rotates rapidly through the torsion spring rod until the caliper rod 62 is squeezed by the L-shaped extrusion rod 63, the caliper rod 62 will be squeezed into the inside of the sliding block 61, and then the push rod 36 will slide from the upper end of the L-shaped extrusion rod 63, and when the connecting rod 66 rotates, the lower end will drive the sliding link 72 to reset, and the other sliding links 72 are reset in turn through the telescopic rod 78 to achieve a cyclic operation, thereby improving work efficiency.

[0025] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An automatic conveying and positioning device for precast beam production, comprising a numerical control machine tool (1), and a conveying track (2) is internally connected to the numerical control machine tool (1) in a transmission manner. It is characterized in that: A control assembly mechanism (3) is slidably connected to the upper surface of the numerically controlled machine tool (1), and a closed-loop mechanism (4) for transporting and fixing precast beam steel bars is fixedly connected to the surface of the transport crawler (2); A locking mechanism (5) for preventing the rotation of the closed-loop mechanism (4) is arranged between the control assembly mechanism (3) and the closed-loop mechanism (4). A layer-by-layer unlocking mechanism (7) for positioning and placing steel bars is fixedly connected to the lower surface of the numerically controlled machine tool (1). A return mechanism (6) for controlling the reset of the layer-by-layer unlocking mechanism (7) is fixedly connected to the surface of the numerically controlled machine tool (1). A reset chute (8) for restoring the control assembly mechanism (3) is fixedly connected to the surface of the numerically controlled machine tool (1). A first rack (9) is fixedly connected to the upper surface of the numerically controlled machine tool (1), and a second rack (10) is fixedly connected to the lower surface of the numerically controlled machine tool (1).

2. The automatic conveying and positioning device for precast beam production according to claim 1, characterized in that: The control assembly mechanism (3) includes a sliding rod (31). The sliding rod (31) is slidably connected to the side surface of the numerically controlled machine tool (1). A fixed box (32) is fixedly connected to the top end of the sliding rod (31). A spline telescopic rod (33) is slidably connected to the inside of the fixed box (32). A moving rod (34) is rotatably connected to the surface of the spline telescopic rod (33). The moving rod (34) is also slidably connected to the inside of the fixed box (32). One end of the spline telescopic rod (33) is fixedly connected to a gear (35). A push rod (36) is fixedly connected to one end of the gear (35). The push rod (36) is only arranged on the first gear (35) among multiple groups of gears (35). Oblique slots (37) are formed on both sides of the fixed box (32). A cross bar (38) is fixedly connected to the lower end of the moving rod (34). An extrusion rod (39) is slidably connected to the lower end of the cross bar (38). The extrusion rod (39) is also slidably connected to the surface of the sliding rod (31).

3. The automatic conveying and positioning device for precast beam production according to claim 2, wherein: The closed-loop mechanism (4) includes a U-shaped support frame (41). The U-shaped support frame (41) is fixedly connected to the surface of the transport crawler (2). A semi-circular ring (42) is fixedly connected to the surface of the U-shaped support frame (41). A runner chute (43) is rotatably connected to the surface of the semi-circular ring (42). A semi-circular tooth (44) is slidably connected to the inside of the runner chute (43). A small gear (45) is rotatably connected to the surface of the semi-circular ring (42). There are two groups of small gears (45) in total, and the two small gears (45) are connected by a transmission belt (46). The axle core of one of the small gears (45) is fixedly connected to the other end of the spline telescopic rod (33).

4. The automatic conveying and positioning device for precast beam production according to claim 3, characterized in that: The locking mechanism (5) includes a snap ring (51). The snap ring (51) is fixedly connected to the other side of the semi-circular ring (42). A spring groove (52) is fixedly connected to the surface of the non-telescopic end of the spline telescopic rod (33). A locking tooth (53) is slidably connected to the inside of the spring groove (52). The locking tooth (53) meshes with the snap ring (51).

5. The automatic conveying and positioning device for precast beam production according to claim 4, wherein: The return mechanism (6) includes a sliding block (61), which is slidably connected to the side of the upper surface of the CNC machine tool (1). A caliper rod (62) is slidably connected inside the sliding block (61). An L-shaped extrusion rod (63) is fixedly connected to the surface of the CNC machine tool (1), and the L-shaped extrusion rod (63) and the sliding block (61) are arranged on the same horizontal line. A spring (64) is arranged between the inside of the sliding block (61) and the caliper rod (62). A notch rod (65) is fixedly connected to the surface of the sliding block (61). A connecting rod (66) is rotatably connected to the side of the CNC machine tool (1) through a torsion spring rod, and the upper end of the connecting rod (66) is slidably connected inside the notch rod (65).

6. The automatic conveying and positioning device for precast beam production according to claim 5, characterized in that: The layer-by-layer unlocking mechanism (7) includes a limit slide rail (71), which is fixed to the side of the CNC machine tool (1). A sliding connecting rod (72) is slidably connected inside the limit slide rail (71). The surface of the sliding connecting rod (72) is movably connected to the connecting rod (66). There are multiple groups of sliding connecting rods (72), and the connecting rod (66) is only arranged on the upper surface of the first sliding connecting rod (72). A spring rod (73) is rotatably connected to the side of the CNC machine tool (1). The upper end of the spring rod (73) is fixedly connected to a connecting rod (75), and the sliding connecting rod (72) is slidably connected inside the connecting rod (75). The lower end of the spring rod (73) is fixedly connected to an inclined panel (74).

7. The automatic conveying and positioning device for precast beam production according to claim 6, wherein: A notch (77) is opened at the lower end of the sliding connecting rod (72). Multiple groups of sliding connecting rods (72) are connected together through a telescopic rod (78). A rotating rod one (76) is rotatably connected to the lower end of the limit slide rail (71), and one end of the rotating rod one (76) is slidably connected inside the notch (77).

8. Method for using the automatic conveying and positioning device for precast beam production, using the automatic conveying and positioning device for precast beam production according to any one of claims 1-7, characterized in that, It includes the following steps: S1. First, fix and position the steel bars required for the precast beam through the closed-loop mechanism (4), and then cooperate with the transport track (2) on the CNC machine tool (1) for transportation. During the movement of the closed-loop mechanism (4), the steel bars placed on the surface can be fixed, preparing for the next precise placement; S2. After the steel bars on the closed-loop mechanism (4) are placed through the rack two (10), the first closed-loop mechanism (4) and the next layer-by-layer unlocking mechanism (7) are misaligned through the layer-by-layer unlocking mechanism (7), so as not to affect the sorting and placement of the steel bars on the next layer-by-layer unlocking mechanism (7) and the next closed-loop mechanism (4); S3. Finally, the caliper rod (62) is extruded by the L-shaped extrusion rod (63), and the caliper rod (62) will be extruded into the inside of the sliding block (61). Then the push rod (36) will slide over the upper end of the L-shaped extrusion rod (63). When the connecting rod (66) rotates, the lower end will drive the sliding connecting rod (72) to reset, and the other sliding connecting rods (72) are sequentially reset through the telescopic rod (78) to realize cyclic operation, improving the work efficiency.

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