A reinforcing steel bending device for construction engineering

Abstract

The utility model discloses a steel bar bending device for building engineering construction, including bending rack, the top end assembly of bending rack has the conveyance seat, the front end assembly of conveyance seat has the fixed base, the upper end assembly of conveyance seat has the moving seat, the upper end installation of moving seat has the limit seat, install the steel pipe clamping pipe in the limit seat, through setting up " steel pipe clamping pipe + electric push rod + pipe plug " the cooperative positioning structure, steel pipe clamping pipe can be full -circumferential wrapping formula clamping to steel bar, avoid the rotation or deviation of steel bar in the conveying and bending process, simultaneously, electric push rod drive pipe plug along the horizontal direction accurate push steel bar, ensure steel bar bending end and the steel pipe bending groove of bending carousel accurate butt joint, effectively will bend angle error control within 0.5, the consistency of batch processing has been improved significantly, satisfies high accuracy construction demand.

Description

Technical Field

[0001] This utility model relates to the field of steel bar bending technology, specifically a steel bar bending device for building construction. Background Technology

[0002] In the construction process, steel bars are core load-bearing components, and their processing accuracy directly affects the stability and safety of the building structure. Among them, steel bar bending is one of the key processes in steel bar processing. Straight steel bars need to be bent into specific angles (such as 90°, 135°, etc.) or shapes according to the construction drawings to meet the construction requirements of beam-column joints, stirrup fabrication, etc.

[0003] Currently, the steel bar bending equipment commonly used in construction engineering is mainly divided into three categories: manual bending machines, semi-automatic bending machines, and fully automatic bending machines. Manual bending machines rely on manual operation and are only suitable for small-diameter steel bars (usually ≤12mm). They are not only labor-intensive and inefficient, but also have large bending angle errors, making it difficult to ensure the consistency of batch processing. Although semi-automatic bending machines are equipped with power units, they still require manual assistance to position the steel bars, which results in cumbersome operation, poor safety, and the steel bars are prone to displacement during the bending process, leading to insufficient bending accuracy. Therefore, it is necessary to improve the existing technology. Utility Model Content

[0004] The purpose of this utility model is to provide a steel bar bending device for construction engineering, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a rebar bending device for construction engineering, comprising a bending frame, a conveying seat mounted at the top of the bending frame, a fixed seat mounted at the front end of the conveying seat; a movable seat mounted at the upper end of the conveying seat, a limiting seat mounted at the upper end of the movable seat, and a steel pipe clamping tube mounted inside the limiting seat; a bending seat mounted at the upper end of the fixed seat, a bending turntable mounted at the upper end of the bending seat, a steel pipe bending groove formed on the side wall of the bending turntable, a coupling seat mounted at the top of the bending seat, a rotating shaft mounted inside the coupling seat, and the bending turntable mounted at the top end of the rotating shaft.

[0006] As a preferred embodiment of the present invention for a steel bar bending device used in building construction, a motor base is installed at the lower end of the bending seat, a bending motor is installed inside the motor base, and the bottom end of the rotating shaft passes through the coupling seat and is connected to the drive end of the bending motor.

[0007] As a preferred embodiment of the present invention for a steel bar bending device used in building construction, the connecting shaft seat includes a shaft cylinder a and a shaft cylinder b arranged opposite to each other. The inner walls of the shaft cylinder a and the shaft cylinder b are evenly spaced along their axis and have rotating cavities. Ball bearings are installed inside the rotating cavities and are fitted to the rotating shaft.

[0008] As a preferred embodiment of the present invention for a steel bar bending device used in building construction, both side walls of the shaft cylinder a and shaft cylinder b are equipped with connecting plates, the side walls of the connecting plates are provided with screw holes, the screw holes are screwed with bolts, and the outer walls of the shaft cylinder a and shaft cylinder b are provided with oil injection holes, which are connected to the rotating cavity.

[0009] As a preferred embodiment of the present invention for a steel bar bending device used in building construction, a threaded rod is installed inside the conveying seat, an inner threaded cylinder is installed at the bottom end of the moving seat and the inner threaded cylinder is screwed to the outside of the threaded rod, a threaded rotating cylinder is installed at the end of the conveying seat, a forward and reverse motor is installed on the outer wall of the conveying seat, and the end of the threaded rod is screwed into the threaded rotating cylinder and passes through the threaded rotating cylinder to connect to the drive end of the forward and reverse motor.

[0010] As a preferred embodiment of the present invention for a steel bar bending device used in building construction, an electric push rod is installed on the top left side of the conveying seat, and a pipe plug is installed on the driving end of the electric push rod. The pipe plug and the steel pipe clamping pipe are on the same horizontal line.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the setting of the steel bar bending device for building construction has a reasonable structural design;

[0012] By setting up a collaborative positioning structure of "steel pipe clamping tube + electric push rod + pipe plug", the steel pipe clamping tube can clamp the steel bars in a full circumferential manner, preventing the steel bars from rotating or shifting during transportation and bending. At the same time, the electric push rod drives the pipe plug to accurately push the steel bars in the horizontal direction, ensuring that the bent end of the steel bar is precisely aligned with the bending groove of the steel pipe on the bending turntable. This effectively controls the bending angle error within 0.5°, significantly improving the consistency of batch processing and meeting the requirements of high-precision construction.

[0013] The bending turntable is assembled with a shaft and a connecting seat, and the shaft and the balls inside the connecting seat are in close contact. The balls can roll flexibly along the rotating cavity, reducing the frictional resistance when the shaft rotates and avoiding shaft deviation caused by rigid friction, thus further ensuring the stability and accuracy of the bending process. Attached Figure Description

[0014] Figure 1 This is a front-view three-dimensional structural schematic diagram of the present invention;

[0015] Figure 2This is a side view of the three-dimensional structure of the present invention;

[0016] Figure 3 This is a schematic diagram of part A of the present utility model;

[0017] Figure 4 This is a schematic diagram of the coupling seat of this utility model.

[0018] In the diagram: 1. Bending machine frame; 2. Conveyor seat; 3. Threaded drum; 4. Forward and reverse motor; 5. Electric push rod; 6. Pipe plug; 7. Threaded rod; 8. Moving seat; 9. Limit seat; 10. Steel pipe clamping tube; 11. Fixed seat; 12. Bending seat; 13. Bending turntable; 14. Steel pipe bending groove; 15. Motor seat; 16. Bending motor; 17. Coupling seat; 18. Rotating shaft; 19. Rotating cavity; 20. Ball bearing; 21. Connecting plate; 22. Screw hole; 23. Bolt; 24. Oil injection hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This utility model provides a technical solution:

[0021] In this technical solution, a steel bar bending device for construction engineering includes a bending frame 1. The top of the bending frame 1 is equipped with a conveying seat 2, and the front end of the conveying seat 2 is equipped with a fixed seat 11. The upper end of the conveying seat 2 is equipped with a movable seat 8, and the upper end of the movable seat 8 is equipped with a limiting seat 9. A steel pipe clamping tube 10 is installed inside the limiting seat 9. The upper end of the fixed seat 11 is equipped with a bending seat 12, and the upper end of the bending seat 12 is equipped with a bending turntable 13. The side wall of the bending turntable 13 is provided with a steel pipe bending groove 14. The top of the bending seat 12 is equipped with a coupling seat 17, and a rotating shaft 18 is installed inside the coupling seat 17. The bending turntable 13 is installed on the top of the rotating shaft 18.

[0022] The bending machine frame 1 serves as the load-bearing foundation of the device. It adopts a welded steel structure with an overall "L"-shaped frame design, featuring a horizontal support base plate at the bottom and a horizontal installation platform at the top. The main body of the frame is made of Q235B carbon structural steel, with a yield strength ≥235MPa and a tensile strength of 375-500MPa, ensuring that the load-bearing capacity meets the equipment's operational requirements.

[0023] Specific data: Frame height 1200-1500mm, support base plate size 1500mm×800mm, thickness 12mm; top mounting platform size 1800mm×600mm, thickness 10mm; frame column cross-section is 100mm×100mm×5mm square steel, column spacing 800mm.

[0024] Installation method: The frame is fixed to the concrete foundation with expansion bolts. The concrete strength grade of the foundation shall not be lower than C20. M16×150mm chemical anchors are used for the expansion bolts. Four anchors are evenly distributed on each support base plate. After installation, the levelness of the top platform of the frame shall be calibrated with a level, and the error shall be ≤0.5mm / m.

[0025] The conveyor seat 2 is a guide carrier for conveying steel bars. It is made of integrated cast aluminum alloy (grade 6061-T6), which has the characteristics of being lightweight and high-strength. It has a horizontal guide cavity inside to accommodate the bottom structure of the threaded rod 7 and the movable seat 8.

[0026] Specific data: The conveyor seat 2 is 1500-2000mm long and has a rectangular cross-section of 180mm×120mm. The guide cavity has a cross-section of 100mm×80mm. The top of the conveyor seat is provided with a guide groove with a width of 20mm, which is adapted to the slider at the bottom of the moving seat 8.

[0027] Installation method: The conveyor seat 2 is fixed to the top mounting platform of the bending machine frame 1 by bolt connection. M12×30mm high strength bolts are used with a bolt spacing of 200mm. During installation, it is necessary to ensure that the guide cavity of the conveyor seat is parallel to the central axis of the bending seat 12, and the parallelism error is ≤0.3mm / m.

[0028] The fixed base 11 is used to support the bending base 12. It is made of Q235B steel plate and has a "convex" structure. The bottom is the mounting base and the top is the mounting surface of the bending base. The surface is milled to ensure the flatness of the mounting.

[0029] Specific data: The overall height of the fixed base 11 is 300mm, the bottom base size is 400mm×300mm×10mm, the top mounting surface size is 250mm×200mm×15mm, and the flatness of the mounting surface is ≤0.1mm.

[0030] Installation method: The fixed seat 11 is connected to the flange face at the front end of the conveyor seat 2 by M16×40mm bolts, and the bottom is further fixed to the top platform of the bending frame 1 by M12×30mm bolts; after installation, it is necessary to ensure that the top mounting surface of the fixed seat is perpendicular to the guide groove of the conveyor seat, and the perpendicularity error is ≤0.2mm / m.

[0031] The movable seat 8 is the actuator that drives the limit seat 9 and the reinforcing bar to move. The main body is made of gray cast iron (HT300). The bottom end is equipped with a slider that matches the guide groove of the conveyor seat. The surface of the slider is inlaid with a polytetrafluoroethylene wear-resistant layer to reduce movement friction.

[0032] Specific data: The movable seat 8 is 200mm high, the bottom slider is 150mm long, 20mm wide, and 15mm thick; the top of the movable seat has a 100mm diameter mounting hole for connecting the limit seat 9.

[0033] Installation method: The slider at the bottom of the movable seat 8 is embedded in the guide groove of the conveyor seat 2, and sliding is achieved by the clearance fit between the slider and the guide groove (clearance 0.1-0.2mm); the inner screw at the bottom of the movable seat is screwed to the threaded rod 7, and the rotation of the threaded rod drives the movable seat to move horizontally along the conveyor seat, with a moving stroke of 0-1200mm.

[0034] The limiting seat 9 is used to fix the steel pipe clamping tube 10. It is forged from No. 45 steel and has a "U" shaped structure. Coaxial mounting holes are opened on both sides of the wall for passing through fixing bolts.

[0035] Specific data: Limit seat 9 height 150mm, opening width 120mm, side wall thickness 20mm, mounting hole diameter 25mm, hole spacing 80mm.

[0036] Installation method: The limit seat 9 is fitted with the mounting hole on the top of the movable seat 8 through the flange at the bottom and is fastened with M20×50mm bolts; during installation, it is necessary to ensure that the axis of the mounting hole of the limit seat is parallel to the axis of the guide cavity of the conveyor seat, and the parallelism error is ≤0.2mm.

[0037] The steel pipe clamping tube 10 is used to clamp the reinforcing bars to prevent them from shifting during transportation and bending. It is made of No. 20 seamless steel pipe and has a rubber anti-slip pad on the inner wall (3mm thick, Shore hardness 60±5). The clamping tube with different inner diameters can be replaced according to the diameter of the reinforcing bars.

[0038] Specific data: The steel pipe clamping tube 10 has a length of 300mm, an outer diameter of 100mm, and a wall thickness of 8mm; it is suitable for steel bars with diameters ranging from 6 to 32mm, corresponding to inner diameters of clamping tubes of 8mm, 10mm, 14mm, 18mm, 22mm, 26mm, and 34mm respectively.

[0039] Installation method: The steel pipe clamping tube 10 is inserted into the "U"-shaped opening of the limiting seat 9 and tightened by M20 bolts on both sides. The ends of the bolts are equipped with arc-shaped pressure blocks (adapted to the outer wall of the clamping tube) to ensure that the clamping tube is installed firmly and the axis does not deviate.

[0040] The bending seat 12 serves as the supporting base for the bending turntable 13. It is made of Q345B low-alloy high-strength structural steel and has internal reinforcing ribs to enhance overall rigidity.

[0041] Specific data: Bending seat 12 height 400mm, bottom mounting surface size 250mm×200mm, top size 200mm×200mm, reinforcing rib thickness 10mm, spacing 100mm.

[0042] Installation method: The bottom of the bending seat 12 is connected to the mounting surface of the top of the fixed seat 11 by M16×40mm bolts. There are 4 bolts in a rectangular distribution. After installation, the flatness of the mounting surface of the top coupling seat of the bending seat needs to be calibrated by a dial indicator. The error is ≤0.1mm.

[0043] The bending turntable 13 is the core working component for bending steel bars. It is made of 40Cr alloy structural steel that has been quenched and tempered (hardness 28-32HRC) and chrome-plated (plating thickness 0.05-0.1mm) to improve wear resistance and corrosion resistance.

[0044] Specific data: The bending turntable 13 has a diameter of 300-500mm and a thickness of 50mm. A 50mm diameter shaft hole is opened in the center for installing the rotating shaft 18. 3-4 steel pipe bending grooves 14 are evenly distributed on the edge of the turntable.

[0045] Installation method: The bending turntable 13 is interference-fitted with the top of the rotating shaft 18 through the shaft hole (interference amount 0.02-0.04mm), and is locked and fixed by the M24 nut at the shaft end; during installation, it is necessary to ensure that the end face of the turntable is perpendicular to the axis of the rotating shaft, and the perpendicularity error is ≤0.05mm.

[0046] The steel pipe bending groove 14 is used to accommodate the reinforcing bars and guide the bending direction. The groove is designed to be semi-circular, and the edge of the groove opening is rounded (radius 2mm) to avoid scratching the surface of the reinforcing bars during bending.

[0047] Specific data: The diameter of the bending groove 14 matches the diameter of the compatible steel bars, which are 8mm, 10mm, 14mm, 18mm, 22mm, 26mm, and 34mm respectively. The groove depth is 1.5 times the diameter of the steel bar, and the spacing between adjacent bending grooves is 50mm.

[0048] Processing method: The groove wall is formed by CNC milling, with a surface roughness Ra≤1.6μm to ensure smooth sliding of the steel bar during bending.

[0049] The coupling seat 17 is used to support the rotating shaft 18 and reduce friction when the shaft rotates. It is made of cast steel (ZG270-500) and has an overall cylindrical structure with a hollow cavity inside.

[0050] Specific data: Coupling seat 17 height 150mm, outer diameter 120mm, inner diameter 80mm, bottom flange size 200mm×200mm, thickness 15mm.

[0051] Installation method: The coupling seat 17 is fitted with the mounting hole on the top of the bending seat 12 through the bottom flange, and is fastened with M12×30mm bolts. There are 6 bolts in a circle. After installation, it is necessary to ensure that the axis of the coupling seat coincides with the axis of the bending turntable 13, and the coaxiality error is ≤0.03mm.

[0052] The rotating shaft 18 is the core component for transmitting power to the bending motor. It is made of No. 45 steel and is quenched and tempered at low temperature (hardness 40-45HRC). The surface is ground to ensure surface precision and wear resistance.

[0053] Specific data: The diameter of the shaft 18 is 50mm, the length is 600mm, and the top is machined with an M24 thread for fixing the bending turntable 13; the surface roughness Ra of the mating section between the shaft body and the connecting seat 17 is ≤0.8μm, and the roundness error is ≤0.01mm.

[0054] Installation method: The shaft 18 is inserted from the top of the coupling seat 17, and the shaft body is in close contact with the ball bearing 20 in the coupling seat. The bottom end passes through the coupling seat and is connected to the drive end of the bending motor 16 through a coupling. The coupling is a flexible pin coupling, model HL5, with a nominal torque of 500 N·m.

[0055] In some technical solutions, a motor base 15 is installed at the lower end of the bending seat 12, and a bending motor 16 is installed inside the motor base 15. The bottom end of the rotating shaft 18 passes through the coupling seat 17 and is connected to the drive end of the bending motor 16.

[0056] The motor mount 15 is used to fix the bending motor 16. It is made of Q235B steel plate and has a concave structure. It has a motor positioning boss inside to ensure the precise installation position of the motor.

[0057] Specific data: Motor mount 15, height 200mm, length 300mm, width 250mm, positioning boss diameter 180mm, thickness 10mm.

[0058] Installation method: The motor base 15 is connected to the lower end face of the bending seat 12 by M12×30mm bolts, with a total of 4 bolts; during installation, it is necessary to ensure that the center line of the positioning boss of the motor base coincides with the center line of the connecting shaft seat 17, and the coaxiality error is ≤0.1mm.

[0059] The bending motor 16 provides power to the bending turntable. It is a three-phase asynchronous motor with overload protection and stable speed. It is equipped with a speed reducer to achieve speed regulation and torque amplification.

[0060] Specific data: Motor power 3-5.5kW, rated voltage 380V, rated speed 1440r / min; reducer model RV63, reduction ratio 1:20, output speed 72r / min, output torque ≥800N・m.

[0061] Installation method: The bending motor 16 is fixed to the positioning boss of the motor base 15 with bolts, using M10×25mm bolts, with a quantity of 4 bolts; the motor output shaft is connected to the reducer input shaft through a coupling, and the reducer output shaft is connected to the bottom end of the rotating shaft 18.

[0062] The connection between the rotating shaft 18 and the drive end (output shaft of the reducer) of the bending motor 16 adopts a rigid coupling to ensure that the power transmission is backlash-free and improve the accuracy of bending angle control.

[0063] Specific data: The coupling model is GY4, the nominal diameter is 50mm, the length is 100mm, the applicable shaft diameter is 50mm, and the allowable speed is 3000r / min.

[0064] Installation method: Place the couplings on the bottom end of shaft 18 and the output shaft of the reducer respectively, and tighten them with set screws (M8×15mm). There are 2 set screws in each group, distributed at 90°. After installation, the coaxiality of the two shafts needs to be calibrated. The radial runout is ≤0.05mm and the end face runout is ≤0.03mm.

[0065] In some technical solutions, the coupling seat 17 includes a shaft cylinder a171 and a shaft cylinder b172 arranged opposite to each other. Rotating cavities 19 are evenly and equidistantly opened on the inner walls of shaft cylinder a171 and shaft cylinder b172 along their axis. Ball bearings 20 are installed inside the rotating cavities 19 and are fitted to the rotating shaft 18.

[0066] Shaft cylinders a171 and b172 are split structures of coupling seats, both made of cast steel (ZG270-500). The two structures are symmetrical and, when assembled, form a complete coupling seat chamber, which is convenient for disassembly and maintenance.

[0067] Specific data: The height of shaft cylinders a171 and b172 is 150mm, the outer diameter is 120mm, the inner diameter is 40mm, and the inner diameter after assembly is 80mm; the flange width of each shaft cylinder is 20mm and the thickness is 15mm.

[0068] Installation method: Shaft cylinders a171 and b172 are joined together by connecting plates 21 on both sides, and after being assembled, they are fitted onto the outside of the rotating shaft 18. The bottom of both shafts fits against the top mounting surface of the bending seat 12 and is fastened with bolts.

[0069] The rotating cavity 19 is the installation space for the ball bearings 20. It is machined by drilling. Each rotating cavity independently accommodates one ball bearing, ensuring that the balls do not interfere with each other when rolling.

[0070] Specific data: The diameter of the rotating cavity 19 is 0.5mm larger than that of the ball 20, and the depth is 2 / 3 of the diameter of the ball; 12 rotating cavities are evenly distributed along the circumference of the inner wall of the shaft cylinder, the central angle between adjacent rotating cavities is 30°, and 2 rows of rotating cavities are arranged axially with a row spacing of 50mm.

[0071] Machining method: CNC drilling machine, hole position accuracy ±0.1mm, hole wall surface roughness Ra≤3.2μm.

[0072] The ball bearing 20 is used to reduce the friction between the rotating shaft 18 and the connecting seat 17. It is made of high carbon chromium bearing steel (GCr15) and is quenched and tempered (hardness 60-62HRC). It has high wear resistance and high contact fatigue strength.

[0073] Specific data: The diameter of the ball bearing 20 is 10mm, the roundness error is ≤0.002mm, and the surface roughness Ra is ≤0.1μm; one ball bearing is installed in each rotating cavity, and the contact pressure between the ball bearing and the surface of the rotating shaft 18 is ≤500MPa.

[0074] Installation method: Place the ball bearings 20 one by one into the rotating cavity 19 of the shaft cylinder. After assembling shaft cylinders a171 and b172, the ball bearings are tightly attached to the surface of the rotating shaft 18 to form a rolling support structure.

[0075] In some technical solutions, connecting plates 21 are installed on both side walls of shaft cylinder a171 and shaft cylinder b172. The side walls of the connecting plates 21 are provided with screw holes 22, and bolts 23 are screwed into the screw holes 22. The outer walls of shaft cylinder a171 and shaft cylinder b172 are provided with oil injection holes 24, and the oil injection holes 24 are connected to the rotating cavity 19.

[0076] The connecting plate 21 is used to connect the shaft cylinder a171 and the shaft cylinder b172. It is made of Q235B steel plate, has a rectangular structure, and has screw holes 22 on its surface to ensure a firm connection.

[0077] Specific data: Connecting plate 21 is 150mm long, 50mm wide, and 10mm thick; one connecting plate is installed on each side of each shaft cylinder and welded to the shaft cylinder, with a weld height of 8mm.

[0078] Installation method: The connecting plate 21 is fixed to the side wall of the shaft cylinder by welding. After welding, stress relief treatment is required. When the shaft cylinder is assembled, the connecting plates on both sides are aligned and fastened by bolts 23.

[0079] The screw hole 22 is the mounting hole for the bolt 23. It is made by tapping and the thread accuracy is 6H to ensure the fit accuracy with the bolt.

[0080] Specific data: The diameter of screw hole 22 is 12mm, the pitch is 1.75mm, and the depth is 30mm; two screw holes are evenly opened on each connecting plate, with a hole spacing of 80mm.

[0081] Processing method: Drill holes using a bench drill and then tap them. The coaxiality error between the hole position and the corresponding screw hole on the connecting plate is ≤0.2mm.

[0082] Bolt 23 is used to fasten shaft sleeves a171 and b172. It is a high-strength bolt (grade 8.8) with good tensile strength and anti-loosening performance.

[0083] Specific data: Bolt 23 is M12×40mm, nominal tensile strength is 800MPa, yield strength is 640MPa; it is used with spring washers and flat washers. The spring washers are standard type (GB / T93-1987), and the flat washers are enlarged series (GB / T96.1-2002).

[0084] Installation method: Pass the bolt 23 through the screw hole 22 of the connecting plate 21, put on the flat washer and spring washer in sequence, and then tighten it. The tightening torque is 45-50 N·m to ensure that the shaft and cylinder are tightly joined without gaps.

[0085] In some technical solutions, a threaded rod 7 is installed inside the conveyor seat 2, an inner threaded cylinder is installed at the bottom of the moving seat 8, and the inner threaded cylinder is screwed to the outside of the threaded rod 7. A threaded rotating drum 3 is installed at the end of the conveyor seat 2, and a forward and reverse motor 4 is installed on the outer wall of the conveyor seat 2. The end of the threaded rod 7 is screwed into the threaded rotating drum 3 and passes through the threaded rotating drum 3 to connect to the drive end of the forward and reverse motor 4.

[0086] In some technical solutions, an electric push rod 5 is installed on the top left side of the conveyor seat 2, and a pipe plug 6 is installed on the drive end of the electric push rod 5. The pipe plug 6 and the steel pipe clamping pipe 10 are on the same horizontal line.

[0087] The threaded rod 7 is the transmission component that drives the moving seat 8. It adopts a trapezoidal thread structure (model Tr40×8), which features high transmission efficiency and good self-locking performance. The threaded rod is made of 40Cr alloy structural steel, which is heat-treated (hardness 28-32HRC) before threading. The surface is plated with hard chrome (plating thickness 0.05-0.1mm) to improve wear resistance and corrosion resistance.

[0088] Specific data: Threaded rod 7 has a length of 1600-2100mm, a diameter of 40mm, a thread height of 4mm, and a thread pitch of 8mm; the threaded rod is supported at both ends by bearings, the bearing model is deep groove ball bearing 6208, the rated dynamic load is 29.8kN, and the rated static load is 17.8kN.

[0089] Installation method: The threaded rod 7 is horizontally installed in the guide cavity of the conveyor seat 2, and its two ends are respectively inserted into the threaded drum 3 and the bearing seat at the end of the conveyor seat; the bearing is installed in the bearing seat through interference fit, the outer ring of the bearing is fitted with the bearing seat with H7 / r6, and the inner ring is fitted with the end of the threaded rod shaft with H7 / k6; after installation, the parallelism of the threaded rod needs to be adjusted to ensure that the parallelism error with the guide groove of the conveyor seat is ≤0.2mm / m.

[0090] The inner threaded barrel serves as the connecting component between the movable seat 8 and the threaded rod 7. It is made of tin bronze (ZCuSn10Pb1), which has good friction reduction and wear resistance, preventing wear caused by direct friction with the threaded rod. The inner threaded barrel is fixed to the bottom end of the movable seat by welding, forming an integrated structure.

[0091] Specific data: The inner screw barrel is 100mm long and 40mm in diameter. The thread type that mates with the threaded rod is Tr40×8 and the thread accuracy is 7H. The inner screw barrel wall thickness is 10mm, and the weld height between it and the bottom of the moving seat is 8mm. Argon arc welding is used for welding.

[0092] Installation method: The inner threaded barrel is pre-welded to the center of the bottom of the movable seat 8. After welding, stress-relieving annealing treatment is required (annealing temperature 250-300℃, heat preservation for 2 hours). During installation, align the inner threaded barrel with the threaded end of the threaded rod 7 and slowly screw it into the threaded rod to ensure smooth thread engagement without jamming.

[0093] The threaded drum 3 is used to support the end of the threaded rod 7 and provide rotation guidance for the threaded rod. It is made of gray cast iron (HT250) and has trapezoidal threads machined inside to mate with the threaded rod. Bearing mounting holes are provided at both ends.

[0094] Specific data: Threaded drum 3 is 150mm long, 80mm outer diameter, 40mm inner diameter, and has an internal thread type Tr40×8; the bearing mounting holes at both ends are 52mm in diameter and 40mm in depth, for mounting deep groove ball bearings 6208.

[0095] Installation method: The threaded drum 3 is connected to the end of the conveyor seat 2 via a flange. The flange is secured with four M10×25mm bolts. The bearing is pressed into the bearing mounting hole of the threaded drum, and then the end of the threaded rod 7 is inserted into the threaded drum, ensuring thread engagement between the threaded rod and the threaded drum. The inner ring of the bearing is interference-fitted with the end of the threaded rod shaft.

[0096] The threaded rod 7 and the threaded drum 3 are screwed together to guide rotation. The connection with the drive end of the forward and reverse motor 4 enables power transmission. The forward and reverse rotation of the motor drives the threaded rod to rotate, thereby driving the moving seat 8 to move horizontally along the conveyor seat.

[0097] Specific data: The thread fit clearance between the threaded rod 7 and the threaded drum 3 is 0.1-0.2mm, the length of the threaded rod extending out of the threaded drum is 50mm, and the fit length with the motor coupling is 30mm.

[0098] Installation method: First, screw one end of the threaded rod 7 into the threaded drum 3 to ensure proper thread fit; then, put half of the motor coupling on the protruding end of the threaded rod and the other half on the motor output shaft. After adjusting the coaxiality, tighten the set screws (M6×10mm) of the coupling. There are 2 set screws in each group, distributed at 180°.

[0099] The electric actuator 5 is used to move the reinforcing bar within the steel pipe clamping tube 10, achieving precise feeding and positioning of the reinforcing bar. It is a ball screw type electric actuator, characterized by high positioning accuracy and stable thrust. The electric actuator is equipped with a limit switch (model LX19-001) to set the maximum stroke and prevent overload damage.

[0100] Specific data: Electric linear actuator 5 rated thrust 5000N, rated voltage 220V, stroke 500mm, positioning accuracy ±0.5mm, running speed 100-300mm / s; linear actuator telescopic tube diameter 30mm, length 600mm.

[0101] Installation method: The electric push rod 5 is installed on the top left side of the conveyor seat 2 via a U-shaped bracket. The bracket is made of Q235B steel plate with a thickness of 8mm. The bracket and the conveyor seat are connected by M8×20mm bolts, with a total of 4 bolts. During installation, it is necessary to ensure that the axis of the electric push rod coincides with the axis of the steel pipe clamping tube 10, and the coaxiality error is ≤0.3mm.

[0102] The tube plug 6 is used to directly contact and push the reinforcing bar. It is made of polyurethane material (Shore hardness 70±5), which has a certain degree of elasticity to avoid scratching the surface of the reinforcing bar during pushing, while enhancing the contact friction with the reinforcing bar to prevent slippage. The tube plug is connected to the electric push rod drive end by a thread for easy replacement.

[0103] Specific data: The diameter of the pipe plug 6 matches the inner diameter of the steel pipe clamping tube 10, which are 8mm, 10mm, 14mm, 18mm, 22mm, 26mm, and 34mm respectively; the length of the pipe plug is 50mm, and the rear end is provided with an M16×20mm thread to cooperate with the threaded hole at the drive end of the electric push rod.

[0104] Installation method: Select the appropriate pipe plug 6 according to the diameter of the steel bar, screw the thread of the rear end of the pipe plug into the threaded hole of the drive end of the electric push rod 5, tighten it and fix it with a locking washer (model GB / T858-1988) to prevent loosening during use; after installation, check the coaxiality of the pipe plug axis and the electric push rod axis, the error ≤0.1mm.

[0105] The plug 6 and the steel pipe clamping tube 10 are kept on the same horizontal line to ensure that the steel bar moves smoothly in the horizontal direction when the electric push rod pushes it, avoiding jamming of the steel bar or a decrease in bending accuracy due to axial misalignment. The overlap of their axes is a key parameter to ensure accurate feeding of the steel bar.

[0106] Specific data: The overlap error between the axis of the pipe plug 6 and the steel pipe clamping tube 10 is ≤0.2mm, and the initial distance between them is 10mm. When the electric push rod is fully extended, the pipe plug can push the reinforcing bar to the end of the steel pipe clamping tube and connect with the steel pipe bending groove 14 of the bending turntable 13.

[0107] Calibration method: After installation, use a laser collimator to calibrate the axis. Align the transmitting end of the laser collimator with one end of the steel pipe clamping tube 10 and the receiving end with the end face of the tube plug 6. Adjust the installation position of the electric push rod until the laser beam completely passes through the center of the steel pipe clamping tube and the tube plug, ensuring that the two are on the same horizontal line.

[0108] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0109] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A steel bar bending device for construction engineering, comprising a bending frame (1), characterized in that, The top of the bending frame (1) is equipped with a conveyor seat (2), and the front end of the conveyor seat (2) is equipped with a fixed seat (11). The upper end of the conveying seat (2) is equipped with a movable seat (8), and the upper end of the movable seat (8) is equipped with a limiting seat (9), and a steel pipe clamping tube (10) is installed inside the limiting seat (9). A bending seat (12) is installed on the upper end of the fixed seat (11), and a bending turntable (13) is assembled on the upper end of the bending seat (12). A steel pipe bending groove (14) is opened on the side wall of the bending turntable (13). A coupling seat (17) is assembled on the top of the bending seat (12), and a rotating shaft (18) is installed inside the coupling seat (17). The bending turntable (13) is installed on the top of the rotating shaft (18).

2. The steel bar bending device for building construction according to claim 1, characterized in that, The lower end of the bending seat (12) is equipped with a motor seat (15), and a bending motor (16) is installed inside the motor seat (15). The bottom end of the rotating shaft (18) passes through the coupling seat (17) and is connected to the drive end of the bending motor (16).

3. The steel bar bending device for building construction according to claim 1, characterized in that, The coupling seat (17) includes a shaft cylinder a (171) and a shaft cylinder b (172) arranged opposite to each other. Rotary cavities (19) are evenly spaced along the axis of the inner walls of the shaft cylinder a (171) and the shaft cylinder b (172). Ball bearings (20) are installed inside the rotating cavity (19) and are fitted to the rotating shaft (18).

4. A steel bar bending device for building construction according to claim 3, characterized in that, Both sides of the shaft cylinder a (171) and shaft cylinder b (172) are equipped with connecting plates (21). The side walls of the connecting plates (21) are provided with screw holes (22). Bolts (23) are screwed into the inside of the screw holes (22). The outer walls of the shaft cylinder a (171) and shaft cylinder b (172) are provided with oil injection holes (24), and the oil injection holes (24) are connected to the rotating cavity (19).

5. A steel bar bending device for building construction according to claim 1, characterized in that, The conveying seat (2) is equipped with a threaded rod (7) inside. The bottom end of the moving seat (8) is equipped with an inner screw cylinder, which is screwed to the outside of the threaded rod (7). The end of the conveying seat (2) is equipped with a threaded rotating cylinder (3). The outer wall of the conveying seat (2) is equipped with a forward and reverse motor (4). The end of the threaded rod (7) is screwed into the threaded rotating cylinder (3) and passes through the threaded rotating cylinder (3) to connect to the drive end of the forward and reverse motor (4).

6. A steel bar bending device for building construction according to claim 1, characterized in that, An electric push rod (5) is installed on the top left side of the conveyor seat (2), and a pipe plug (6) is installed on the drive end of the electric push rod (5). The pipe plug (6) and the steel pipe clamping pipe (10) are on the same horizontal line.

Images