A reinforcing steel bar bending device for construction engineering

Abstract

This invention discloses a rebar bending device for construction engineering, relating to the technical field of rebar bending equipment. It includes a base frame and a drive plate that rotates horizontally on it, driven by a power system. The drive plate has a crank wheel for applying bending force to the rebar. The base frame has a bending diameter mechanism for adjusting the inner diameter of the rebar's bend. The bending diameter mechanism includes a centering column coaxially arranged with the drive plate, fixedly connected to the base frame, and equipped with multiple sets of axial arc plates. The base frame has a diameter-changing component for adjusting the diameter of a circular structure, and a displacement component for adjusting the horizontal distance between the crank wheel and the centering column is located on a central plate. This invention, by setting up a bending diameter mechanism and changing the diameter of the circular structure composed of multiple sets of axial arc plates, thereby changing the inner diameter of the rebar during bending under stress, can adapt to rebar bending with different diameters and inner diameter requirements, meeting various construction engineering needs.

Description

Technical Field

[0001] This invention relates to the field of steel bar bending equipment technology, specifically to a steel bar bending equipment for construction engineering. Background Technology

[0002] In construction engineering, steel reinforcement is an important structural material, widely used in concrete structures to enhance their load-bearing capacity and crack resistance. However, in actual construction, steel reinforcement often needs to be bent and processed according to design requirements to meet the shape and stress requirements of different components.

[0003] Chinese Patent (Announcement No.: CN118237502A) discloses a solution that includes a base, a workstation plate fixedly mounted on the top of the base, a bending column in the center of the workstation plate, and an adjustable abutment mechanism on one side of the bending column. The base is equipped with a force-applying mechanism, which includes a mounting part. One end of the mounting part is rotatably mounted on the base, and the other end is movably equipped with an adjustment part. A force-applying roller is vertically positioned at the end of the adjustment part to bend the reinforcing bar along the bending column. This invention allows for adjustment of the abutment mechanism and the force-applying mechanism on the workstation plate relative to the bending column, enabling adjustments based on different types of reinforcing bars or specific requirements to find the optimal bending and force-applying position, facilitating the bending of the reinforcing bar and improving bending efficiency.

[0004] Existing rebar bending equipment has limited ability to adjust the inner diameter of the bend when bending rebar, making it difficult to meet the diverse inner diameter requirements of rebars of different diameters and different engineering requirements. Specifically, traditional equipment usually requires manual replacement of molds or adjustment of equipment structure when adjusting the inner diameter of the bend, which is relatively complicated and inefficient. In addition, when it is necessary to adjust the inner diameter of the bend, it is difficult to adjust the contact point between the rebar and the equipment and the bending path simultaneously, resulting in uneven stress on the rebar during the bending process, which can easily lead to problems such as inaccurate bending, rebar deformation or equipment wear. Therefore, a rebar bending equipment for construction engineering is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a steel bar bending device for construction engineering, which has the advantage of adapting to steel bar bending operations with different inner diameter requirements of the bend, and solves the problem of low efficiency when adjusting the inner diameter of the steel bar bend.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a steel bar bending device for construction engineering, comprising a base frame and a drive plate that rotates horizontally by a power system, the drive plate being provided with a crank wheel for applying bending force to the steel bar, and the base frame being provided with a bending diameter mechanism for adjusting the inner diameter of the steel bar bend.

[0007] The bending diameter mechanism includes a centering column coaxially arranged with the drive plate. The centering column is fixedly connected to the base frame. The centering column is provided with multiple sets of shaft arc plates. The multiple sets of shaft arc plates are arranged in a ring array with the centering column as the center and form a circular structure in the horizontal cross section. The base frame is provided with a diameter-adjusting component to adjust the diameter of the circular structure.

[0008] A central disk is also fixedly connected to the base frame. The drive disk rotates on the central disk with a fixed axis. The drive disk and the centering column are coaxially arranged. The central disk is provided with a distance adjustment component that adjusts the horizontal distance between the crank and the centering column.

[0009] The base frame is also equipped with a spacing component that limits the bending length of the reinforcing bars and makes way for them when they bend.

[0010] Preferably, the variable diameter assembly includes a horizontally rotatable co-positioning disk, which is fixedly rotatable on the base frame. An axial rod is fixedly connected to one side of the shaft arc plate facing the centering column, and an axial groove is provided on the centering column for the axial rod to slide.

[0011] The axial rod is fixedly connected to a positioning pin at one end facing the co-positioning plate. A transverse through groove is provided on the centering column for the positioning pin to slide through. The bottom end of the positioning pin slides through the base frame. A positioning groove is provided on the co-positioning plate for the positioning pin to slide through.

[0012] Preferably, a support plate is fixedly connected to the central disk, and a worm gear driven by a motor and freely rotating in the vertical direction is provided on the support plate. The worm gear rotates on the support plate with its axis fixed, and a worm wheel is meshed with the worm gear and the worm wheel is coaxially fixed on the corresponding disk.

[0013] Preferably, the displacement assembly includes a positioning seat fixedly connected to the upper surface of the drive plate, and the positioning seat is provided with an axial block that moves freely along the radial direction of the drive plate. The axial block is fixedly connected to the crank wheel.

[0014] The positioning seat has a fixed-axis rotating threaded rod, and an axial block is threadedly connected to the threaded rod. The positioning seat has a radial groove for the axial block to slide.

[0015] Preferably, a driven universal joint is coaxially fixed on the threaded rod, and a driving universal joint is drivenly connected to the driven universal joint. The driving universal joint is fixedly rotated on the support plate, and the driving universal joint is drivenly connected to the worm gear.

[0016] An inner splined cylinder is coaxially fixed to one end of the active universal joint facing the driven universal joint. A splined shaft is slidably disposed on the inner splined cylinder, and the splined shaft is coaxially fixed to the driven universal joint.

[0017] Preferably, the base frame is provided with two sets of arc-shaped clamps for limiting the position of the reinforcing bars. Both sets of arc-shaped clamps include an integrally formed straight surface, and the straight surfaces of the two sets of arc-shaped clamps are arranged opposite to each other.

[0018] The base frame is provided with guide grooves for sliding connection of two sets of arc-slit clamps, and both sets of arc-slit clamps are threaded with locking bolts to limit their own position.

[0019] Preferably, the distance fixing component includes an external gear ring fixedly sleeved on the drive plate, the external gear ring being meshed with a rack, and a groove for the rack to slide horizontally is provided on the base frame;

[0020] A crank is fixedly connected to the rack, and a rectangular groove is provided on the base frame for the crank to slide through. A stop plate is provided on the crank, and the stop plate is detachably connected to the crank. A locking bolt for limiting its own position is threaded on the stop plate.

[0021] The base frame is provided with a blocking component to limit the horizontal movement of the rack.

[0022] Preferably, the blocking component includes two sets of clearance teeth slidably disposed on the groove, the two sets of clearance teeth being located at both ends of the rack, and positioning blocks being fixedly connected to the clearance teeth, and guide pins being provided on the positioning blocks;

[0023] A support block is fixedly connected to the rack. The end of the guide pin away from the positioning block is fixedly connected to the support block. A circular hole is provided on the positioning block for the guide pin to slide through. A relief spring is sleeved on the outer circumference of the guide pin. The two ends of the relief spring are fixedly connected to the positioning block and the support block, respectively.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] This invention, by setting up a bending mechanism, changes the diameter of a circular structure composed of multiple sets of axial arc plates, thereby altering the inner diameter of the reinforcing bar during bending under stress. This adapts to bending of reinforcing bars with different diameters and inner diameter requirements, meeting the needs of various construction projects. Furthermore, it can be dynamically adjusted according to different diameter reinforcing bars and different bending requirements, improving the versatility and applicability of the equipment.

[0026] This invention, by setting a displacement component and changing the distance between the crank and the centering column, can avoid motion interference caused by the presence of the crank to the diameter change process of the circular structure formed by multiple sets of axial arc plates. At the same time, it can ensure that the reinforcing bar can pass through the gap between the axial arc plate and the crank and change the contact position of the crank to the reinforcing bar after the diameter change in the bend, so as to ensure that the reinforcing bar can bend smoothly when subjected to bending force, thereby ensuring the smooth progress of the reinforcing bar bending operation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the component containing the centering column of the present invention;

[0029] Figure 3 This is a schematic diagram of the component containing the central disk of the present invention;

[0030] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0031] Figure 5 This is a schematic diagram of the component containing the axial block of the present invention;

[0032] Figure 6 For the present invention Figure 5 Enlarged view at point B in the middle;

[0033] Figure 7 This is a schematic diagram of the component containing the axial arc plate of the present invention;

[0034] Figure 8 For the present invention Figure 7 Enlarged view at point C;

[0035] Figure 9 This is a schematic diagram of the component containing the axial rod of the present invention.

[0036] In the diagram: 1. Base frame; 2. Drive plate; 3. Center plate; 4. Centering column; 5. Axial rod; 6. Axial arc plate; 7. Locating pin; 8. Corresponding plate; 9. Locating groove; 10. Transverse through groove; 11. Worm gear; 12. Worm; 13. Crankshaft; 14. Vertical support plate; 15. Active universal joint; 16. Driven universal joint; 17. Radial slide groove; 18. Locating seat; 19. Threaded rod; 20. Axial block; 21. External gear ring; 22. Rack; 23. Displacement tooth; 24. Locating block; 25. Guide pin; 26. Displacement spring; 27. Crank rod; 28. Stop plate; 29. ​​Arc-shaped clamp; 30. Guide groove. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1 to 9The present invention provides a technical solution: a steel bar bending device for construction engineering, including a base frame 1 and a drive plate 2 that is driven by a power system to rotate horizontally. The drive plate 2 is provided with a crank wheel 13 for applying bending force to the steel bar. The base frame 1 is provided with a bending diameter mechanism for adjusting the inner diameter of the steel bar bend.

[0039] The bending diameter mechanism includes a centering column 4 coaxially arranged with the drive plate 2. The centering column 4 is fixedly connected to the base frame 1. The centering column 4 is provided with multiple sets of shaft arc plates 6. The multiple sets of shaft arc plates 6 are arranged in a ring array with the centering column 4 as the center and form a circular structure in the horizontal cross section. The base frame 1 is provided with a diameter adjustment component to adjust the diameter of the circular structure.

[0040] A central disk 3 is also fixedly connected to the base frame 1. The drive disk 2 rotates on the central disk 3 on a fixed axis. The drive disk 2 and the centering column 4 are coaxially arranged. The central disk 3 is provided with a distance shifting component that adjusts the horizontal distance between the crank 13 and the centering column 4.

[0041] The base frame 1 is also provided with a spacing component that limits the bending length of the reinforcing bars and makes way for them when they bend.

[0042] The base frame 1 is provided with two sets of arc-shaped clamps 29 for limiting the position of the reinforcing bars. Both sets of arc-shaped clamps 29 include an integrally formed straight surface, and the straight surfaces of the two sets of arc-shaped clamps 29 are arranged opposite to each other. The base frame 1 is provided with guide grooves 30 for sliding connection of the two sets of arc-shaped clamps 29. Both sets of arc-shaped clamps 29 are threaded with locking bolts for limiting their own position.

[0043] like Figures 1-3 As shown, when bending the reinforcing bar, the drive unit can cause the drive plate 2 and the crank 13 set on it to rotate in the horizontal direction. The reinforcing bar is placed in the gap between the two sets of arc clamps 29 and the gap between the multiple sets of axial arc plates 6 and the crank 13. When the crank 13 rotates with the drive plate 2, the crank 13 can squeeze the reinforcing bar to deflect around the centering column 4 and cause the reinforcing bar to deform towards the centering column 4. The diameter of the circular structure composed of the multiple sets of axial arc plates 6 is approximately the inner diameter of the bend when the reinforcing bar is bent.

[0044] Meanwhile, in actual operation, the required inner diameter of the bend is determined by the size and purpose of the steel bars to be processed. Then, the diameter of the circular structure composed of multiple sets of axial arc plates 6 is changed by the diameter-changing component to ensure that the steel bars can meet the required inner diameter standard when bent in the subsequent process. This allows the steel bars to bend with different diameters and inner diameter requirements, thereby meeting the needs of various construction projects and ensuring the quality of steel bar bending.

[0045] Meanwhile, as the diameter of the circular structure composed of multiple sets of axial arc plates 6 changes, the displacement component can operate synchronously, thereby synchronously changing the horizontal distance between the crank 13 and the centering column 4. This ensures that the crank 13 can maintain a certain distance from the deformation position when applying bending force to the reinforcing bar. The bending path of the reinforcing bar changes with the change of the inner diameter of the bend. When the inner diameter of the bend increases, the bending path of the reinforcing bar will also increase accordingly. Increasing the distance between the crank 13 and the centering column 4 can ensure that the reinforcing bar always bends along the correct path during the bending process, avoiding bending quality problems caused by path deviation.

[0046] It should be noted that in actual use, the horizontal position and spacing of the two sets of missing arc clamps 29 are adjustable, thereby adapting to the processing requirements of steel bars with different inner diameters of the bends by changing their positions. Furthermore, the change in the spacing of the two sets of missing arc clamps 29 can limit the movement of steel bars with different diameters, ensuring that the steel bars can deform when subjected to bending forces, thereby ensuring the accuracy of the steel bar bending process.

[0047] In one preferred embodiment, the variable diameter assembly includes a horizontally rotatable co-position disk 8, which is fixedly rotatable on the base frame 1. An axial rod 5 is fixedly connected to one side of the axial arc plate 6 facing the centering column 4. An axial groove is provided on the centering column 4 for the axial rod 5 to slide.

[0048] The axial rod 5 is fixedly connected to a positioning pin 7 at one end facing the co-positioning plate 8. A transverse through groove 10 is provided on the centering column 4 for the positioning pin 7 to slide through. The bottom end of the positioning pin 7 slides through the base frame 1. A positioning groove 9 is provided on the co-positioning plate 8 for the positioning pin 7 to slide through.

[0049] A support plate 14 is fixedly connected to the central disk 3. A worm gear 12 driven by a motor and freely rotating in the vertical direction is provided on the support plate 14. The worm gear 12 rotates on the support plate 14 with a fixed axis and is meshed with a worm wheel 11. The worm wheel 11 is coaxially fixed on the corresponding disk 8.

[0050] like Figure 3 , Figure 5 , Figure 7 , Figure 8 and Figure 9 As shown, the worm gear 12 is driven to rotate vertically by a motor fixed on the support plate 14, which in turn drives the worm wheel 11, which is meshed with the worm gear 12, and the corresponding disk 8, which is coaxially fixed with the worm wheel 11, to rotate a certain angle in the horizontal direction.

[0051] Meanwhile, an axial rod 5 is fixedly connected to the axial arc plate 6, and a positioning pin 7 is fixedly connected to the axial rod 5. The positioning pin 7 is slidably connected to the corresponding plate 8 through the positioning groove 9. Thus, when the corresponding plate 8 rotates with the worm gear 11, it can drive multiple sets of axial rods 5 and the axial arc plates 6 set on them to move synchronously in opposite directions or in opposite directions, thereby changing the diameter of the circular structure composed of multiple sets of axial arc plates 6, so as to change the inner diameter of the bend of the steel bar during the bending process.

[0052] It should be noted that, in actual use, due to the self-locking property between the worm gear 12 and the worm wheel 11, when the reinforcing bar is subjected to bending force and exerts a compressive force on the multiple sets of axial arc plates 6, the multiple sets of axial arc plates 6 will not be relatively displaced from the centering column 4 due to the compression of the reinforcing bar, thereby further ensuring the bending accuracy of the reinforcing bar.

[0053] Based on the variable diameter assembly embodiment, the displacement assembly includes a positioning seat 18 fixedly connected to the upper surface of the drive plate 2, and an axial block 20 that moves freely along the radial direction of the drive plate 2 is provided on the positioning seat 18. The axial block 20 is fixedly connected to the crank 13.

[0054] The positioning seat 18 has a fixed-axis rotating threaded rod 19, and an axial block 20 is threadedly connected to the threaded rod 19. The positioning seat 18 has a radial groove 17 for the axial block 20 to slide.

[0055] A driven universal joint 16 is coaxially fixed on the threaded rod 19. The driven universal joint 16 is drivenly connected to a driving universal joint 15. The driving universal joint 15 is rotatably mounted on the support plate 14 and is drivenly connected to the worm gear 11. An inner spline cylinder is coaxially fixed at one end of the driving universal joint 15 facing the driven universal joint 16. A spline shaft is slidably mounted on the inner spline cylinder and is coaxially fixed on the driven universal joint 16.

[0056] like Figure 3 , Figure 5 and Figure 6 As shown, when the worm gear 11 rotates horizontally, it can drive the driving universal joint 15 connected to it to rotate synchronously. The worm gear 11 and the driving universal joint 15 can be driven by two sets of meshing bevel gears to ensure that they rotate synchronously. At the same time, when the driving universal joint 15 rotates, it drives the spline shaft on the driven universal joint 16 to rotate through the inner spline sleeve provided on it, thereby enabling the driven universal joint 16 to rotate synchronously with the driving universal joint 15.

[0057] At the same time, the driven universal joint 16 and the threaded rod 19 are coaxially fixed, which causes the worm gear 11 and the threaded rod 19 to rotate synchronously. The rotation of the worm gear 11 can synchronously change the diameter of the circular structure formed by multiple sets of axial arc plates 6, thereby adjusting the inner radius of the bend when the steel bar is bent. When the threaded rod 19 rotates, it can change the distance between the perpendicular bisector of the center of the axial block 20 that is threadedly engaged with it and the center plate 3 and the centering column 4, thereby changing the distance between the crank 13 fixed on the axial block 20 and the centering column 4.

[0058] The change in the distance between the crank 13 and the centering column 4 can prevent the presence of the crank 13 from causing motion interference to the diameter change process of the circular structure formed by multiple sets of axial arc plates 6. At the same time, it can ensure that the reinforcing bar can pass through the gap between the axial arc plate 6 and the crank 13, and change the contact position of the crank 13 with the reinforcing bar after the diameter change in the bend, so as to ensure that the reinforcing bar can bend smoothly when subjected to bending force, thereby ensuring the smooth progress of the reinforcing bar bending operation.

[0059] It should be noted that, in actual use, since the driven universal joint 16 and the threaded rod 19 are coaxially arranged and the fixed axis rotates on the positioning seat 18, the driven universal joint 16 can rotate with the drive plate 2, while the driving universal joint 15 rotates on the center plate 3. Thus, through the cooperation of the inner spline cylinder and the spline shaft, the displacement difference between the driving universal joint 15 and the driven universal joint 16 caused by the rotation of the drive plate 2 is compensated, so as to ensure that the driven universal joint 16 can rotate synchronously with the driving universal joint 15. Therefore, when changing the inner diameter of the steel bar bend, the horizontal position of the crank 13 can be changed synchronously.

[0060] Based on the distance shifting component embodiment, the distance fixing component includes an external toothed ring 21 fixedly sleeved on the drive plate 2, the external toothed ring 21 is meshed with a rack 22, and a groove is provided on the base frame 1 for the rack 22 to slide horizontally.

[0061] A crank 27 is fixedly connected to the rack 22. A rectangular groove is provided on the base frame 1 for the crank 27 to slide through. A stop plate 28 is provided on the crank 27. The stop plate 28 is detachably connected to the crank 27. A locking bolt for limiting its own position is threaded on the stop plate 28. A blocking component is provided on the base frame 1 to limit the horizontal movement stroke of the rack 22.

[0062] The blocking component includes two sets of clearance teeth 23 slidably disposed on the first groove. The two sets of clearance teeth 23 are respectively located at both ends of the rack 22. A positioning block 24 is fixedly connected to the clearance teeth 23, and a guide pin 25 is provided on the positioning block 24.

[0063] A support block is fixedly connected to the rack 22. One end of the guide pin 25 away from the positioning block 24 is fixedly connected to the support block. The positioning block 24 has a round hole for the guide pin 25 to slide through. A relief spring 26 is sleeved on the outer circumferential surface of the guide pin 25. The two ends of the relief spring 26 are fixedly connected to the positioning block 24 and the support block, respectively.

[0064] like Figure 1 , Figure 3 and Figure 4 As shown, when the drive plate 2 rotates under the drive of the power system, it can apply bending force to the steel bar through the crank 13 set on it. The drive plate 2 is fixedly sleeved with an external toothed ring 21, and the external toothed ring 21 is meshed with a rack 22. Thus, when the external toothed ring 21 rotates, it can drive the rack 22 to slide in a groove.

[0065] Meanwhile, when determining the bending length of the reinforcing bar, the stop plate 28 is fixedly connected to the crank rod 27 by locking bolts, and the end of the reinforcing bar abuts against the stop plate 28 at the required bending length. When the drive plate 2 drives the crank wheel 13 to rotate, it can cause the rack 22 to move horizontally a certain distance. The rack 22 is fixedly connected to the crank rod 27. Then, when the crank wheel 13 is about to apply bending force to the reinforcing bar, it can cause the stop plate 28 to move a small distance away from the reinforcing bar. This is to avoid the presence of the stop plate 28 interfering with the deflection process of the end of the reinforcing bar while determining the bending length of the reinforcing bar, and to reduce the damage to the stop plate 28 caused by the scraping of the end of the reinforcing bar, thereby ensuring the accuracy of the stop plate 28 in limiting the bending length of the reinforcing bar.

[0066] It should be noted that in actual use, when the drive plate 2 drives the crank 13 to rotate but before it contacts the reinforcing bar, that is, when the outer gear ring 21 initially rotates, it has already moved a certain distance horizontally through the rack 22, thereby causing the stop plate 28 to move away from the end of the reinforcing bar and not to contact it. As the drive plate 2 continues to rotate, the outer gear ring 21 engages with the clearance teeth 23 provided at the end of the rack 22, and driven by the rotation of the outer gear ring 21, the clearance teeth 23 can reciprocate horizontally on the rack 22, thereby... The rotation process of the external gear ring 21 is adapted to avoid motion interference during the rotation of the external gear ring 21 and the drive plate 2. Therefore, when the drive plate 2 and the external gear ring 21 rotate subsequently, the horizontal positions of the rack 22, the crank 27 and the stop plate 28 will not continue to shift in the horizontal direction under the restriction of the moving component. As a result, the stop plate 28 will not be excessively displaced due to the excessive bending angle of the steel bar. In actual use, it is only necessary for the movement process of the stop plate 28 away from the steel bar to avoid interference with the bending of the steel bar.

[0067] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel bar bending device for construction engineering, comprising a base frame (1) and a drive plate (2) mounted thereon and driven horizontally by a power system, wherein the drive plate (2) is provided with a crank wheel (13) for applying bending force to the steel bars, characterized in that: The base frame (1) is provided with a bending diameter mechanism for adjusting the inner diameter of the steel bar bend; The curved diameter mechanism includes a centering column (4) coaxially arranged with the drive plate (2). The centering column (4) is fixedly connected to the base frame (1). The centering column (4) is provided with multiple sets of shaft arc plates (6). The multiple sets of shaft arc plates (6) are arranged in a ring array with the centering column (4) as the center and form a circular structure in the horizontal section. The base frame (1) is provided with a diameter-adjusting component for adjusting the diameter of the circular structure. A central disk (3) is also fixedly connected to the base frame (1). The drive disk (2) rotates on the central disk (3) with a fixed axis. The drive disk (2) and the centering column (4) are coaxially arranged. The central disk (3) is provided with a distance shifting component for adjusting the horizontal distance between the crank (13) and the centering column (4). The base frame (1) is also provided with a spacing component that limits the bending length of the reinforcing bars and makes way when the reinforcing bars are bent; The distance fixing component includes an external toothed ring (21) fixedly sleeved on the drive plate (2), the external toothed ring (21) is meshed with a rack (22), and a groove is provided on the base frame (1) for the rack (22) to slide horizontally; A crank (27) is fixedly connected to the rack (22). A rectangular groove is provided on the base frame (1) for the crank (27) to slide through. A stop plate (28) is provided on the crank (27). The stop plate (28) and the crank (27) are detachably connected. A locking bolt for limiting its own position is threaded on the stop plate (28). The base frame (1) is provided with a blocking component to limit the horizontal movement stroke of the rack (22); The blocking component includes two sets of clearance teeth (23) slidably disposed on the first groove. The two sets of clearance teeth (23) are respectively located at both ends of the rack (22). A positioning block (24) is fixedly connected to the clearance teeth (23), and a guide pin (25) is provided on the positioning block (24). A support block is fixedly connected to the rack (22). One end of the guide pin (25) away from the positioning block (24) is fixedly connected to the support block. A round hole is provided on the positioning block (24) for the guide pin (25) to slide through. A relief spring (26) is sleeved on the outer circumference of the guide pin (25). The two ends of the relief spring (26) are fixedly connected to the positioning block (24) and the support block, respectively.

2. The steel bar bending device for construction engineering according to claim 1, characterized in that: The variable diameter assembly includes a horizontally rotatable coaxial plate (8), which rotates on the base frame (1) with a fixed axis. An axial rod (5) is fixedly connected to one side of the shaft arc plate (6) facing the centering column (4). An axial groove is provided on the centering column (4) for the axial rod (5) to slide. The axial rod (5) is fixedly connected to a positioning pin (7) at one end facing the co-positioning plate (8). A transverse through groove (10) is provided on the centering column (4) for the positioning pin (7) to slide through. The bottom end of the positioning pin (7) slides through the base frame (1). A positioning groove (9) is provided on the co-positioning plate (8) for the positioning pin (7) to slide through.

3. The steel bar bending device for construction engineering according to claim 2, characterized in that: A support plate (14) is fixedly connected to the central disk (3). A worm gear (12) driven by a motor and freely rotating in the vertical direction is provided on the support plate (14). The worm gear (12) rotates on the support plate (14) with a fixed axis, and the worm gear (12) is meshed with a worm wheel (11). The worm wheel (11) is coaxially fixed on the corresponding disk (8).

4. The steel bar bending device for construction engineering according to claim 3, characterized in that: The displacement assembly includes a positioning seat (18) fixedly connected to the upper surface of the drive plate (2), and an axial block (20) that moves freely along the radial direction of the drive plate (2) is provided on the positioning seat (18). The axial block (20) is fixedly connected to the crank (13). The positioning seat (18) has a fixed-axis rotating threaded rod (19), and an axial block (20) is threadedly connected to the threaded rod (19). The positioning seat (18) has a radial groove (17) for the axial block (20) to slide.

5. A steel bar bending device for construction engineering according to claim 4, characterized in that: A driven universal joint (16) is coaxially fixed on the threaded rod (19). The driven universal joint (16) is connected to a driving universal joint (15). The driving universal joint (15) rotates on the support plate (14) with a fixed axis, and the driving universal joint (15) is connected to the worm gear (11). The active universal joint (15) is coaxially fixed with an inner spline cylinder at one end facing the driven universal joint (16), and a spline shaft is slidably arranged on the inner spline cylinder, and the spline shaft is coaxially fixed on the driven universal joint (16).

6. The steel bar bending device for construction engineering according to claim 1, characterized in that: The base frame (1) is provided with two sets of arc-slit clamps (29) for limiting the position of the reinforcing bars. Both sets of arc-slit clamps (29) include an integrally formed straight surface, and the straight surfaces in the two sets of arc-slit clamps (29) are arranged opposite to each other. The base frame (1) is provided with a guide groove (30) for sliding connection of two sets of arc-slit clamps (29), and both sets of arc-slit clamps (29) are threaded with locking bolts for limiting their own position.

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