Automatic straightening and cutting machine for construction site steel bars

Abstract

This utility model discloses an automatic rebar straightening and cutting integrated machine for construction sites, including a base, a bracket fixed on the base, and a control box. Two support plates are fixedly connected to the upper end of the bracket, and a frame is rotatably connected between the two support plates. Multiple straightening wheel sets are installed within the frame. When rotating, these wheel sets form a circular straightening channel with the same diameter as the rebar, enabling continuous straightening of bent rebar. A drive mechanism is located on one side of the support plate, using two adjustable drive rollers to transport rebars of different diameters. A hydraulic cutting mechanism is installed on the bracket, located on one side of the drive mechanism. This utility model can perform preliminary straightening of coiled rebar during cutting, and can also provide tension during the straightening process to induce preliminary deformation of the rebar. It generally utilizes multiple modular straightening wheel sets for straightening.

Description

Technical Field

[0001] This utility model relates to the field of building material processing technology, and in particular to an integrated automatic straightening and cutting machine for steel bars used on construction sites. Background Technology

[0002] Coiled steel bars, also known as wire rods, are steel products made by hot-rolling steel to a certain size and then coiling it into a disc shape using a coiling device. Their diameter is relatively small, typically between 8 and 12 millimeters, and they appear as continuous spiral discs. The diameter of the coil varies depending on different specifications and production requirements, generally around 1 to 2 meters. When using coiled steel bars, they need to be straightened using a steel bar straightening machine. The bent steel bar is fed into the straightening machine's inlet, and the operation is carried out according to the machine's instructions to straighten the steel bar to the required straight shape. Based on the specific length required for construction, appropriate cutting tools such as wire cutters or abrasive cutters are used to cut the steel bar. Before cutting, accurate measurements must be taken and marked with chalk to ensure the accurate length of the cut steel bar.

[0003] Currently, coiled steel bars are usually placed directly on the ground during cutting. They are pulled into a spiral shape during the cutting process. When they enter the straightening machine, they twist and deform, resulting in severe deformation and dents on the surface of the steel bars. This can even damage the straightening roller assembly of the straightening machine. Furthermore, the straightening roller resistance is adjusted by bolts, which is inconvenient and difficult to adjust with precision. Utility Model Content

[0004] The purpose of this invention is to solve the problems in the existing technology where the steel bars are pulled into a spiral shape during cutting, and twisted and deformed when entering the straightening machine, resulting in severe deformation and dents on the surface of the steel bars, and even damage to the straightening roller group of the straightening machine. Furthermore, the straightening roller resistance is adjusted by bolts, which is inconvenient and difficult to adjust with precision. Therefore, this invention proposes an integrated automatic straightening and cutting machine for steel bars used on construction sites.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic rebar straightening and cutting integrated machine for construction sites includes a base, a bracket fixed on the base, and a control box. Two support plates are fixedly connected to the upper end of the bracket, and a frame is rotatably connected between the two support plates. Multiple straightening wheel sets are installed in the frame. When the multiple straightening wheel sets rotate, they form a circular straightening channel with the same diameter as the rebar, so as to realize continuous straightening of bent rebar.

[0007] A drive mechanism is provided on one side of the support plate. The drive mechanism uses two adjustable drive rollers to transport steel bars of different diameters. A hydraulic cutting mechanism is installed on the bracket on one side of the drive mechanism.

[0008] A limit wheel assembly is installed on one side of the bracket. The limit wheel assembly is located at the front end of the straightening wheel assembly. It achieves preliminary straightening and limiting of the reinforcing bars through two pressure rollers and two movable limit rollers. A roller assembly for continuously conveying reinforcing bars is fixedly installed on the base.

[0009] Preferably, the straightening roller assembly includes a frame, in which two first straightening rollers and two second straightening rollers are rotatably connected by ball bearings. The two first straightening rollers and the two second straightening rollers are spaced at the same distance. One end of the frame is provided with two folded edges, and one end of the frame is fixedly connected to a square frame. The square frame is fixedly connected to one end of the frame by multiple bolts.

[0010] Multiple partitions are provided on opposite sides of the frame, dividing the interior of the frame into multiple mounting chambers for fixed frames. Support shafts are fixedly connected to both ends of the frame, and two support shafts are rotatably connected to two support plates through needle roller bearings. A steel bar through hole is opened at the center of each support shaft, and a drive component for driving the frame to rotate is installed on the shaft wall of one of the support shafts.

[0011] Preferably, the drive assembly includes a first pulley, which is fixed to the shaft wall of the support shaft and wound with a belt. A second pulley is wound around the inner side of the belt. A first motor is fixedly connected to the lower end of the support plate. The output end of the first motor is coaxially fixedly connected to one side of the second pulley. A steel guide tube is provided at one end of the support shaft.

[0012] Preferably, the driving mechanism includes an adjusting plate and two rectangular plates. Multiple guide posts are fixedly connected between the two rectangular plates. The four corners of the adjusting plate are respectively sleeved with multiple guide posts through guide holes. The lower end of the adjusting plate is rotatably connected to two rotating shafts through ball bearings. Two driving rollers are respectively fixed to the lower ends of the two rotating shafts. The side wall of the lower rectangular plate is rotatably connected to two driving shafts through needle bearings. The upper ends of the two driving shafts are fixedly connected to spline shafts. The lower end of the driving roller is provided with a spline hole that mates with the spline shaft. The side wall of the driving roller is provided with multiple annular grooves, the size of which decreases from top to bottom.

[0013] The side wall of the adjusting plate is fixedly connected to multiple fixing plates. Multiple fixing holes are opened at equal intervals on the side wall of the multiple fixing plates. A bolt is sleeved in one of the fixing holes. The edge of the upper rectangular plate is connected to the bolt through a threaded hole. A power assembly that synchronously drives two drive rollers is installed at the lower end of the rectangular plate.

[0014] Preferably, the power assembly includes a second motor, which is fixed to the lower end of the rectangular plate. The output end of the second motor is fixedly connected to the lower end of one of the drive shafts. Sprockets are fixedly connected to the shaft walls of both drive shafts, and a chain is wound around the two sprockets.

[0015] Preferably, the limiting wheel assembly includes a horizontal plate, and two cylindrical guide rods are sleeved on the side wall of the horizontal plate through round holes. Both cylindrical guide rods are horizontally fixed on the bracket. The upper end of the horizontal plate is rotatably connected to the two limiting rollers through roller bearings, and both ends of the two pressure rollers are horizontally rotatably connected to the bracket through needle roller bearings.

[0016] Preferably, the distance between the two pressure rollers and the two limiting rollers is the same, and two buffer springs are sleeved on the wall of the cylindrical guide rod, with the opposite ends of the two buffer springs respectively fixed on the bracket.

[0017] Preferably, the base has slots on both opposite sides, and each slot has a locking block. The locking block is fixed to the base with screws. A positioning column is fixedly connected to the upper end of the locking block. Two protective sleeves are fitted on the side wall of the positioning column, and a support assembly is provided between the two positioning columns.

[0018] Preferably, the support assembly includes two horizontal tubes and two sleeves. The two sleeves are respectively sleeved on the side walls of the two positioning columns and fixedly connected by fixing bolts. One sleeve is fixedly connected to the two horizontal tubes by two support arms on its tube wall. The other sleeve is fixedly connected to two horizontal arms on its tube wall. A cylinder is fixedly connected to one side of each of the two horizontal arms, and the cylinder is sleeved to one end of the horizontal tube.

[0019] Compared with the prior art, this utility model provides an integrated automatic straightening and cutting machine for steel bars on construction sites, which has the following beneficial effects:

[0020] 1. This construction site uses an automatic rebar straightening and cutting integrated machine. The free end of the coiled rebar enters the straightening channel composed of multiple straightening wheel sets and then enters the drive mechanism. The drive mechanism is driven by the drive rollers. During the driving process, the drive wheel sets provide tension to gradually release the coiled rebar. After passing through the limit wheel set, the rebar is initially bent by two pressure rollers, changing the original bent rebar structure. After being straightened continuously by multiple straightening wheel sets, the originally bent rebar can be formed into a straight strip. When the predetermined length is reached, it is cut by a hydraulic cutting mechanism.

[0021] 2. This technical solution uses two first straightening rollers and two second straightening rollers that are perpendicular to each other and have the same spacing in space, which can form a regular quadrilateral in space. When the regular quadrilateral rotates, it can form a circle with the side length as the diameter. In addition, the straightening roller set used in this technical solution adopts a modular design, and different diameter coiled steel bars can be used by using straightening roller sets with different spacing.

[0022] The parts not covered in this device are the same as or can be implemented using existing technology. This utility model can achieve preliminary straightening of coiled steel bars during the cutting process. During the straightening process, it can also provide tension to cause preliminary deformation of the steel bars. Generally, it uses multiple sets of modular straightening wheel sets for straightening. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of an integrated automatic straightening and cutting machine for steel bars used on construction sites, as proposed in this utility model.

[0024] Figure 2 This is a structural diagram of the frame and straightening wheel assembly in an integrated automatic rebar straightening and cutting machine for construction sites proposed in this utility model;

[0025] Figure 3 This utility model discloses a structural diagram of the straightening wheel assembly in an integrated automatic rebar straightening and cutting machine for construction sites. Figure 1 ;

[0026] Figure 4 This utility model discloses a structural diagram of the straightening wheel assembly in an integrated automatic rebar straightening and cutting machine for construction sites. Figure 2 ;

[0027] Figure 5 This invention provides a schematic diagram of the drive mechanism in an integrated automatic rebar straightening and cutting machine for construction sites. Figure 1 ;

[0028] Figure 6 This invention provides a schematic diagram of the drive mechanism in an integrated automatic rebar straightening and cutting machine for construction sites. Figure 2 ;

[0029] Figure 7 This is a schematic diagram of the limiting wheel group in an automatic rebar straightening and cutting integrated machine for construction sites proposed in this utility model;

[0030] Figure 8 This is a schematic diagram of the support component in an integrated automatic rebar straightening and cutting machine for construction sites proposed in this utility model;

[0031] Figure 9This utility model proposes an integrated automatic straightening and cutting machine for steel bars used on construction sites. Figure 1 A schematic diagram of the structure at point A in the middle.

[0032] In the diagram: 1. Frame; 2. Pressure roller; 3. Limiting roller; 4. Column; 5. Sleeve; 6. Idler roller assembly; 7. Bracket; 8. Control box; 9. Support plate; 10. Rectangular plate; 11. Frame body; 12. First pulley; 13. Rebar guide tube; 14. First straightening roller; 15. First motor; 16. Belt; 17. Second pulley; 18. Second straightening roller; 19. Square frame; 20. Spacer; 21. Support shaft; 22. Sprocket; 23. Adjusting plate; 24. Fixing plate; 25. Guide column; 26. Drive roller; 27. Chain; 28. Second motor; 29. ​​Splined shaft; 30. Horizontal plate; 31. Buffer spring; 32. Horizontal tube; 33. Cylinder; 34. Length meter. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0034] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Example:

[0036] Reference Figure 1-9 An automatic rebar straightening and cutting integrated machine for construction sites includes a base, a bracket 7 fixed on the base, and a control box 8. Two support plates 9 are fixedly connected to the upper end of the bracket 7. A frame 1 is rotatably connected between the two support plates 9. Multiple straightening wheel sets are installed inside the frame 1. When the multiple straightening wheel sets rotate, they form a circular straightening channel with the same diameter as the rebar, so as to realize continuous straightening of bent rebar.

[0037] The specific solution is as follows: the straightening wheel assembly includes a frame 11. Inside the frame 11, two first straightening rollers 14 and two second straightening rollers 18 are rotatably connected via ball bearings. The two first straightening rollers 14 and the two second straightening rollers 18 are spaced at the same distance. One end of the frame 11 is provided with two folded edges. One end of the frame 1 is fixedly connected with a square frame 19. The square frame 19 is fixedly connected to one end of the frame 11 by multiple bolts. On opposite sides inside the frame 11, multiple partitions 20 are provided. The multiple partitions 20 divide the interior of the frame 11 into multiple mounting chambers for fixing the frame 11. Both ends of the frame 11 are fixedly connected with support shafts 21. Both support shafts 21 are rotatably connected to two support plates 9 via needle roller bearings. A steel bar through hole is opened at the center of each support shaft 21. A drive component for driving the frame 1 to rotate is installed on the shaft wall of one of the support shafts 21.

[0038] The drive assembly includes a first pulley 12, which is fixed to the shaft wall of the support shaft 21 and wound with a belt 16. A second pulley 17 is wound around the inner side of the belt 16. A first motor 15 is fixedly connected to the lower end of the support plate 9. The output end of the first motor 15 is coaxially fixedly connected to one side of the second pulley 17. A rebar guide tube 13 is provided at one end of the support shaft 21. A drive mechanism is provided on one side of the support plate 9. The drive mechanism uses two adjustable drive rollers 26 to transport rebars of different diameters. A hydraulic cutting mechanism is installed on one side of the support 7 located on the drive mechanism. A limit wheel set is installed on one side of the support 7. The limit wheel set is located at the front end of the straightening wheel set and achieves preliminary straightening and limiting of the rebars through two pressure rollers 2 and two movable limit rollers 3. A continuous rebar conveying roller assembly 6 is fixedly installed on the base. The roller assembly 6 is equipped with a power device to assist in driving the disc to rotate.

[0039] like Figure 1 As shown, the coiled rebar is placed on the roller assembly 6. Its free end passes through the limiting wheel set and enters the rebar through-hole. Then it enters the straightening channel composed of multiple straightening wheel sets and enters the drive mechanism. It is driven by the drive roller 26 of the drive mechanism. During the drive process, the drive wheel set 26 provides tension to gradually release the coiled rebar. After passing through the limiting wheel set, the rebar can be bent for the first time by two pressure rollers 2, changing the original bent rebar structure. After being straightened by multiple straightening wheel sets, the originally bent rebar can be straightened into a straight strip. When the predetermined length is reached, it is cut by a hydraulic cutting mechanism. The hydraulic cutting mechanism consists of a gantry frame and a hydraulic cylinder. The hydraulic cylinder is fixed on the gantry frame, and its output end passes through the gantry frame and is fixedly connected to the cutting blade. A material passage is opened on the vertical part of the gantry frame. When the rebar reaches the cutting length, the hydraulic press directly pushes the cutting blade down to directly cut the rebar. The hydraulic cylinder can be provided with hydraulic power by an electric hydraulic station.

[0040] Reference Figure 4 This technical solution employs two first straightening rollers 14 and two second straightening rollers 18 that are perpendicular to each other and equally spaced in space, which can form a regular quadrilateral in space. When the regular quadrilateral rotates, it can form a circle with the side length as the diameter. For example, if the gap is set to 8mm, it can be applied to coiled steel bars with a diameter of 8mm. In addition, the straightening roller set used in this technical solution adopts a modular design, and different diameter coiled steel bars can be matched by using straightening roller sets with different spacing.

[0041] The driving mechanism of this technical solution includes an adjusting plate 23 and two rectangular plates 10. Multiple guide posts 25 are fixedly connected between the two rectangular plates 10. The four corners of the adjusting plate 23 are respectively sleeved with multiple guide posts 25 through guide holes. The lower end of the adjusting plate 23 is rotatably connected to two rotating shafts through ball bearings. Two driving rollers 26 are respectively fixed to the lower ends of the two rotating shafts. The side wall of the lower rectangular plate 10 is rotatably connected to two driving shafts through needle bearings. The upper ends of the two driving shafts are fixedly connected to spline shafts 29. The lower end of the driving roller 26 is provided with a spline hole that mates with the spline shaft 29. The depth of the spline hole is greater than the length of the spline hole 29. The side wall of the driving roller 26 is provided with multiple annular grooves. The size of the multiple annular grooves decreases from top to bottom, so as to be suitable for coiled steel bars of different diameters. The common diameters of coiled steel bars are 8mm, 10mm and 12mm.

[0042] Multiple fixing plates 24 are fixedly connected to the side wall of the adjusting plate 23. Multiple fixing holes are equally spaced on the side wall of the multiple fixing plates 24. The spacing of the multiple fixing holes matches the spacing of multiple annular grooves. No measurement is required during adjustment; only the position of the fixing holes needs to be adjusted. A bolt is fitted into one of the fixing holes. The edge of a rectangular plate 10 located above is connected to the bolt through a threaded hole. A power assembly for synchronously driving two drive rollers 26 is installed at the lower end of the rectangular plate 10. The power assembly includes a second motor 28, which is fixed at the lower end of the rectangular plate 10. The output end of the second motor 28 is fixedly connected to the lower end of one of the drive shafts. A sprocket 22 is fixedly connected to the shaft wall of each of the two drive shafts. A chain 27 is wound around the two sprockets 22.

[0043] The drive mechanism can quickly adjust the position of the annular groove on the drive roller 26 by adjusting the position of the fixed plate 24, thus making it suitable for clamping coiled steel bars of different diameters. After clamping, the second motor 28 drives the drive shaft to rotate the spline shaft 29. When the spline shaft 29 rotates, it drives the drive roller 26 to rotate through the spline hole. Furthermore, through the linkage of the sprocket 22 and the chain 27, the synchronous rotation of the two drive rollers 26 can be achieved to drive the straightened coiled steel bars to move.

[0044] On the other hand, the limiting wheel assembly set in this technical solution includes a horizontal plate 30. Two cylindrical guide rods are sleeved on the side wall of the horizontal plate 30 through round holes. Both cylindrical guide rods are horizontally fixed on the bracket 7. The upper end of the horizontal plate 30 is rotatably connected to two limiting rollers 3 through roller bearings. Both ends of the two pressure rollers 2 are rotatably connected to the bracket 7 through needle roller bearings. The distance between the two pressure rollers 2 and the two limiting rollers 3 is the same. Two buffer springs 31 are sleeved on the rod wall of the cylindrical guide rod. The opposite ends of the two buffer springs 31 are fixed on the bracket 7. The two pressure rollers 2 can limit and press the spread coiled steel bars, so that the coiled steel bars are pressed and deformed by the pressure rollers 2 when they spread out. In addition, the movable limiting rollers 3 can limit the coiled steel bars and prevent the steel wire from getting stuck at the end of the pressure rollers 2.

[0045] This technical solution adopts a horizontal cutting method. During cutting, the material is cut directly in the reverse direction of the coil shape as it was manufactured. Therefore, the initial straightening effect can be achieved during cutting through tension and the limit wheel set. Compared with the traditional method of directly pulling the material during cutting, which causes the steel wire to be discharged in a spiral shape, resulting in twisting and deformation of the steel bar during straightening and affecting the quality of the coiled steel bar, this method uses slots on both sides of the base. Each slot contains a locking block, which is fixed to the base with screws. The upper end of the locking block is fixedly connected to a positioning column 4. The side wall of the positioning column 4 is fitted with two protective sleeves. A support assembly is set between the two positioning columns 4. The support assembly includes two horizontal tubes 32 and Two sleeves 5 are respectively fitted onto the side walls of two positioning columns 4 and fixedly connected by fixing bolts. One sleeve 5 is fixedly connected to two horizontal pipes 32 by two support arms on its pipe wall, and the other sleeve 5 is fixedly connected to two horizontal arms on its pipe wall. A cylinder 33 is fixedly connected to one side of each horizontal arm. The cylinder 33 is fitted onto one end of the horizontal pipe 32. When filling the coiled steel bars, only one side of the column 4 and horizontal pipe 32 needs to be removed, while the positioning column 4 on the other side is not removed. When the coiled steel bars are placed on the roller assembly 6, the removed positioning column 4 is reassembled so that the horizontal pipe 32 is inserted into the cylinder 33. In this way, the coiled steel bars can be positioned and supported.

[0046] The control scheme adopted in this technical solution uses existing technology. The control box 8 mainly uses a PLC controller to realize the autonomous setting of conveying speed, cutting length and cutting speed. During the cutting process, the conveying can be stopped for cutting. All of the above control systems use existing technology and are not within the protection scope of this utility model. They will not be described in detail here.

[0047] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An integrated automatic rebar straightening and cutting machine for construction sites, comprising a base, a support (7) fixed on the base, and a control box (8), characterized in that, The upper end of the bracket (7) is fixedly connected to two support plates (9), and the two support plates (9) are rotatably connected to a frame (1). Multiple straightening wheel sets are installed in the frame (1). When the multiple straightening wheel sets rotate, they form a circular straightening channel with the same diameter as the steel bar, so as to realize continuous straightening of the bent steel bar. A drive mechanism is provided on one side of the support plate (9). The drive mechanism uses two adjustable drive rollers (26) to transport steel bars of different diameters. A hydraulic cutting mechanism is installed on one side of the support (7) located on the drive mechanism. The bracket (7) is equipped with a limiting wheel set on one side. The limiting wheel set is located at the front end of the straightening wheel set and achieves preliminary straightening and limiting of the steel bars through two pressure rollers (2) and two movable limiting rollers (3). The base is fixedly equipped with a roller assembly (6) for continuously conveying steel bars.

2. The automatic rebar straightening and cutting integrated machine for construction sites according to claim 1, characterized in that, The straightening wheel assembly includes a frame (11), inside which two first straightening rollers (14) and two second straightening rollers (18) are rotatably connected by ball bearings. The two first straightening rollers (14) and the two second straightening rollers (18) are spaced at the same distance. One end of the frame (11) is provided with two folded edges. One end of the frame (1) is fixedly connected to a square frame (19), which is fixedly connected to one end of the frame (11) by multiple bolts. Multiple partitions (20) are provided on opposite sides inside the frame (11). The multiple partitions (20) divide the interior of the frame (11) into multiple installation chambers for fixing the frame (11). Support shafts (21) are fixedly connected to both ends of the frame (11). The two support shafts (21) are rotatably connected to the two support plates (9) through needle roller bearings. A steel bar through hole is opened at the center of each support shaft (21). A drive component for rotating the drive frame (1) is installed on the shaft wall of one of the support shafts (21).

3. The automatic rebar straightening and cutting integrated machine for construction sites according to claim 2, characterized in that, The drive assembly includes a first pulley (12), which is fixed to the shaft wall of the support shaft (21) and wound with a belt (16). A second pulley (17) is wound around the inner side of the belt (16). A first motor (15) is fixedly connected to the lower end of the support plate (9). The output end of the first motor (15) is coaxially fixedly connected to one side of the second pulley (17). A steel guide tube (13) is provided at one end of the support shaft (21).

4. The automatic rebar straightening and cutting integrated machine for construction sites according to claim 1, characterized in that, The driving mechanism includes an adjusting plate (23) and two rectangular plates (10). Multiple guide posts (25) are fixedly connected between the two rectangular plates (10). The four corners of the adjusting plate (23) are respectively sleeved with multiple guide posts (25) through guide holes. The lower end of the adjusting plate (23) is rotatably connected to two rotating shafts through ball bearings. Two driving rollers (26) are respectively fixed to the lower ends of the two rotating shafts. The side wall of the lower rectangular plate (10) is rotatably connected to two driving shafts through needle bearings. The upper ends of the two driving shafts are fixedly connected to spline shafts (29). The lower end of the driving roller (26) is provided with a spline hole that matches the spline shaft (29). The side wall of the driving roller (26) is provided with multiple annular grooves. The size of the multiple annular grooves decreases from top to bottom. The side wall of the adjusting plate (23) is fixedly connected to multiple fixing plates (24). Multiple fixing holes are opened at equal intervals on the side wall of the multiple fixing plates (24). A bolt is fitted into one of the fixing holes. The edge of the rectangular plate (10) located above is connected to the bolt through a threaded hole. The lower end of the rectangular plate (10) is equipped with a power assembly that synchronously drives two drive rollers (26).

5. The automatic rebar straightening and cutting integrated machine for construction sites according to claim 4, characterized in that, The power assembly includes a second motor (28), which is fixed to the lower end of the rectangular plate (10). The output end of the second motor (28) is fixedly connected to the lower end of one of the drive shafts. Sprockets (22) are fixedly connected to the shaft walls of both drive shafts, and a chain (27) is wound around the two sprockets (22).

6. The automatic rebar straightening and cutting integrated machine for construction sites according to claim 1, characterized in that, The limiting wheel assembly includes a horizontal plate (30). Two cylindrical guide rods are sleeved on the side wall of the horizontal plate (30) through a round hole. The two cylindrical guide rods are horizontally fixed on the bracket (7). The upper end of the horizontal plate (30) is rotatably connected to the two limiting rollers (3) through roller bearings. The two ends of the two pressure rollers (2) are rotatably connected to the bracket (7) through needle roller bearings.

7. The automatic rebar straightening and cutting integrated machine for construction sites according to claim 6, characterized in that, The two pressure rollers (2) are spaced at the same distance from the two limiting rollers (3). Two buffer springs (31) are sleeved on the wall of the cylindrical guide rod. The opposite ends of the two buffer springs (31) are fixed on the bracket (7).

8. The automatic rebar straightening and cutting integrated machine for construction sites according to claim 1, characterized in that, The base has slots on both sides, and each slot has a locking block. The locking block is fixed to the base with screws. The upper end of the locking block is fixedly connected to a positioning column (4). The side wall of the positioning column (4) is fitted with two protective sleeves. A support assembly is provided between the two positioning columns (4).

9. The automatic rebar straightening and cutting integrated machine for construction sites according to claim 8, characterized in that, The support assembly includes two horizontal tubes (32) and two sleeves (5). The two sleeves (5) are respectively sleeved on the side walls of the two positioning columns (4) and fixedly connected by fixing bolts. One of the sleeves (5) is fixedly connected to the two horizontal tubes (32) by two support arms on its tube wall. The other sleeve (5) is fixedly connected to two horizontal arms on its tube wall. A cylinder (33) is fixedly connected to one side of each of the two horizontal arms. The cylinder (33) is sleeved to one end of the horizontal tube (32).

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