CN118237830A - Steel bar positioning device for civil engineering and construction method thereof - Google Patents

Abstract

The invention provides a reinforcing steel bar positioning device for civil engineering and a construction method thereof, and relates to the technical field of reinforcing steel bar positioning. The invention comprises a welding table and a welding frame fixed on the upper surface of the welding table, wherein an angle adjusting and fixing mechanism is arranged on the surface of the welding frame and comprises an electric push rod capable of automatically controlling lifting and a lifting guide rod fixed at the bottom end of the electric push rod, an angle adjusting disc is sleeved on the outer surface of the lifting guide rod, and two symmetrical limiting mechanisms are arranged outside the welding frame. According to the invention, through the matching design of the welding table, the welding frame, the angle adjusting and fixing mechanism, the limiting mechanism, the first fixing rod, the second fixing rod, the supporting mechanism, the fixing column, the protective mask and the blower, the angle between two steel bars can be adjusted according to the requirements, and then the two steel bars can be welded according to the use requirements, so that the welding machine is not only convenient for workers to use, but also has strong applicability.

Description

A steel bar positioning device for civil construction and construction method thereof

Technical Field

The invention relates to a steel bar positioning device, in particular to a steel bar positioning device for civil construction and a construction method thereof, belonging to the technical field of steel bar positioning.

Background technique

In the field of civil engineering, steel bars are an indispensable building material. With the rapid development of the economy, the demand for steel bars in high-rise buildings has been greatly increased, and there are also high requirements for the quality of steel bars. In actual use, most of the steel bars used in civil construction sites will be reprocessed according to actual conditions, that is, re-cut, lengthened or welded in other ways.

Patent number CN117324820A discloses a construction steel bar welding device, including a bracket, on which a ring welding mechanism is provided, the ring welding mechanism is used to perform ring welding on two weld joints at opposite ends of two steel bars; the ring welding mechanism includes a swivel, which is rotatably connected to the bracket, a rotating drum is fixedly connected to one side of the swivel, and the rotating drum is rotatably connected to the bracket through a rotating mechanism, and two welding machines are respectively provided on the inner side wall of the swivel according to the central symmetry distribution. The construction steel bar welding device can make the welding of the gap between the two weld joints more uniform and sufficient through the ring welding mechanism, and can avoid the occurrence of bubbles inside the welding end to cause false welding, and further can prevent the steel bar from breaking due to the existence of false welding after welding.

Although the construction steel bar welding device in the above patent can perform positioning welding on steel bars to facilitate welding of steel bars, it can only weld two steel bars together in a straight line. It is difficult to weld two steel bars together at different angles, and it is difficult to adjust the angle formed between the two steel bars according to the needs of use. The applicability during use is low; therefore, the present invention provides a steel bar positioning device for civil engineering and a construction method thereof.

Summary of the invention

The purpose of the present invention is to provide a steel bar positioning device for civil engineering and a construction method thereof in order to solve the above-mentioned problem, so as to solve the problem in the prior art that it is difficult to weld two steel bars at different angles.

The present invention is implemented through the following technical scheme: a steel bar positioning device for civil engineering and a construction method thereof, comprising a welding table and a welding frame fixed on the upper surface of the welding table, the surface of the welding frame is provided with an angle adjustment fixing mechanism, the angle adjustment fixing mechanism comprises an electric push rod that can automatically control the lifting and lowering and a lifting guide rod fixed at the bottom end of the electric push rod, the outer surface of the lifting guide rod is sleeved with an angle adjustment disk, the outside of the welding frame is provided with two symmetrical limiting mechanisms, the limiting mechanism comprises a horizontal plate and a mechanical claw installed at the bottom of the horizontal plate, and the upper surface of the horizontal plate is hinged with a hinged rod.

Preferably, the angle adjustment fixing mechanism also includes teeth fixed on the inner wall of the angle adjustment disk in a circular array, the outer surface of the lifting guide rod is fixedly connected to a motor fixing ring, the inner wall of the motor fixing ring is fixedly connected to a power motor, the output shaft of the power motor is fixedly connected to an adjusting gear, the adjusting gear is meshed with the teeth, a limiting groove is provided on the outer surface of the angle adjustment disk, a support rod is slidably connected to the inside of the limiting groove, and the end of the support rod away from the angle adjustment disk is fixed to the welding frame.

Preferably, a slide groove is provided at the bottom end of the lifting guide rod, a conical block 1 is slidably connected inside the slide groove, a conical block 2 is fixedly connected to the inner wall of the slide groove, an articulated block 1 and an articulated block 2 are fixedly connected to the outer surfaces of the conical block 1 and the outer surfaces of the conical block 2 respectively, a telescopic plate 1 is fixedly connected to the upper surface of the articulated block 1, and the upper end of the telescopic plate 1 is fixed to the bottom surface of the angle adjustment disk.

Preferably, the limiting mechanism also includes an L-shaped telescopic rod, the telescopic end of the L-shaped telescopic rod is fixedly connected to a telescopic column, the bottom end of the telescopic column is fixedly connected to a fixing frame, the fixing frame is fixedly connected to the upper surface of the horizontal plate, and the upper ends of the two hinged rods are hinged to hinge block one and hinge block two, respectively.

Preferably, a connecting rod is fixedly connected to the upper surface of the horizontal plate, and one end of the connecting rod away from the horizontal plate is fixedly connected to a magnet sheet, and one end of the two L-shaped telescopic rods are respectively fixedly connected to a fixing rod one and a fixing rod two, and the fixing rod one and the fixing rod two are respectively fixedly connected to the angle adjustment plate and the lifting guide rod.

Preferably, a supporting mechanism is arranged below the angle adjustment fixing mechanism, and the supporting mechanism includes a central axis rod fixedly connected to the welding frame, the outer surface of the central axis rod is fixedly connected to telescopic plate 2 and guide telescopic rods arranged at equal distances, a guide frame is arranged on the outside of the central axis rod, the telescopic end of each guide telescopic rod is fixedly connected to the guide frame, one end of the telescopic plate 2 is fixedly connected to the guide frame, and the inner wall of the guide frame is rotatably connected to a rotating roller.

Preferably, a hair dryer is fixedly connected to the welding frame, the output end of the hair dryer is fixedly connected to an air supply duct, an air outlet is installed at one end of the air supply duct away from the hair dryer, a fixing column is fixed on the welding frame, and a protective mask is fixed in the middle of the fixing column.

Preferably, the outer surface of the welding table is fixedly connected to a steel bar transverse placement rack, the outer surface of the steel bar transverse placement rack is fixedly connected to a flat bracket arranged at equal distances, the bottom surface of the steel bar transverse placement rack is fixedly connected to an oblique support rod, the end of the oblique support rod away from the steel bar transverse placement rack is fixedly connected to the outer surface of the welding table, and a balancing mechanism is provided at one end of the steel bar transverse placement rack.

Preferably, the balancing mechanism includes a connecting frame fixed to the bottom surface of the steel bar transverse placement frame, the bottom end of the connecting frame is fixedly connected to a accommodating box, the interior of the accommodating box is slidably connected to a sliding plate, the bottom surface of the sliding plate is fixedly connected to support springs arranged at equal distances, the bottom end of each support spring is fixedly connected to the inner bottom wall of the accommodating box, and the upper surface of the sliding plate is fixedly connected to a flat bracket 2.

A steel bar positioning device for civil engineering and a construction method thereof, comprising the following steps:

S1: Two steel bars are placed on two horizontal steel bar placement racks respectively, and one end of the steel bar is placed against the welding rack. The electric push rod is controlled to extend, driving the horizontal plate and the mechanical claw to descend. The mechanical claw is controlled by the control panel to clamp and fix the steel bar.

S2: Control the electric push rod to shorten, drive the horizontal plate and the mechanical claw to rise, so that the two steel bars are close to each other and in contact with each other.

S3: Control the power motor to start, drive the adjusting gear to rotate, the rotation of the adjusting gear drives the angle adjusting disk to rotate, and the rotation of the angle adjusting disk drives the fixing rod to rotate.

S4: The rotation of the fixed rod drives the L-shaped telescopic rod, the telescopic column, the horizontal plate and the mechanical claw to rotate, and at the same time, the telescopic plate can drive the hinge block and the hinge rod to rotate. When they are rotated to a suitable position, the two steel bars are welded.

The present invention provides a steel bar positioning device for civil engineering and a construction method thereof, which have the following beneficial effects:

The invention can adjust the angle between two steel bars as needed and then weld the two steel bars according to usage requirements through the coordinated design of a welding table, a welding frame, an angle adjustment fixing mechanism, a limiting mechanism, a fixing rod one, a fixing rod two, a supporting mechanism, a fixing column, a protective mask and a hair dryer. This is not only convenient for workers to use, but also has strong applicability.

The invention can act as a fulcrum for the two hinged rods through the coordinated arrangement of the central axis rod, the guide telescopic rod, the second telescopic plate, the guide frame and the rotating roller. The provision of a protective mask and a hair dryer can protect the face of the worker when the worker is performing welding operations.

Through the coordinated design of the L-shaped telescopic rod, telescopic column and fixed frame, the invention can keep the horizontal plate and the mechanical claw in a horizontal state at all times, which is convenient for workers to carry out welding and can ensure the welding quality of the steel bars. Through the coordinated setting of the connecting rod and the magnet sheet, when two steel bars come into contact, the two magnet sheets can be attracted to each other, which can enhance the stability of the two steel bars when in contact and facilitate workers to carry out welding.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a three-dimensional structure of the present invention;

FIG2 is a schematic diagram of a partial three-dimensional structure of the present invention;

FIG3 is a schematic diagram of the three-dimensional structure of the angle adjustment fixing mechanism of the present invention;

FIG4 is a schematic diagram of the angle adjustment disk and its internal three-dimensional structure of the present invention;

FIG5 is an enlarged schematic diagram of the structure at A in FIG4 of the present invention;

FIG6 is a schematic diagram of the three-dimensional structure of the support mechanism of the present invention;

FIG7 is a schematic diagram of a three-dimensional structure of a steel bar transverse placement rack and a flat bracket according to the present invention;

FIG. 8 is a schematic diagram of the three-dimensional structure of the balancing mechanism of the present invention.

【Main component symbol description】

1. Welding table; 2. Welding rack;

3. Angle adjustment fixing mechanism; 31. Electric push rod; 32. Lifting guide rod; 33. Angle adjustment plate; 34. Tooth; 35. Motor fixing ring; 36. Power motor; 37. Adjusting gear; 38. Slide; 39. Articulated block 1; 310. Telescopic plate 1; 311. Articulated block 2; 312. Conical block 1; 313. Support rod; 314. Limiting groove; 315. Conical block 2;

4. Limiting mechanism; 41. L-shaped telescopic rod; 42. Telescopic column; 43. Fixed frame; 44. Horizontal plate; 45. Mechanical claw; 46. Articulated rod; 47. Connecting rod; 48. Magnetic sheet;

5. Fixing rod one; 6. Fixing rod two;

7. Support mechanism; 71. Central axis rod; 72. Guide telescopic rod; 73. Second telescopic plate; 74. Guide frame; 75. Rotating roller;

8. Fixed column; 9. Protective mask; 10. Hair dryer; 11. Air duct; 12. Air outlet; 14. Horizontal steel bar placement rack; 15. Diagonal support rod; 16. Flat bracket one;

17. Balancing mechanism; 171. Connecting frame; 172. Accommodating box; 173. Sliding plate; 174. Support spring; 175. Flat bracket II.

Detailed ways

The embodiment of the present invention provides a steel bar positioning device for civil engineering and a construction method thereof.

Please refer to Figures 1 and 7, which include a welding table 1 and a welding frame 2 fixed on the upper surface of the welding table 1. A control panel is installed on the outer surface of the welding table 1, which can control the electrical components in the device. A steel bar transverse placement frame 14 is fixedly connected to the outer surface of the welding table 1. The setting of the steel bar transverse placement frame 14 can support the steel bars. The outer surface of the steel bar transverse placement frame 14 is fixedly connected to a flat bracket 16 arranged at equal distances. When two steel bars are welded at different angles, the flat bracket 16 can also support and place the steel bars. The bottom surface of the steel bar transverse placement frame 14 is fixedly connected to an oblique support rod 15. The end of the oblique support rod 15 away from the steel bar transverse placement frame 14 is fixedly connected to the outer surface of the welding table 1. The oblique support rod 15 can strengthen the steel bars To ensure the stability of the transverse placement frame 14, a balancing mechanism 17 is provided at one end of the steel bar transverse placement frame 14, and the balancing mechanism 17 includes a connecting frame 171 fixed to the bottom surface of the steel bar transverse placement frame 14, and the bottom end of the connecting frame 171 is fixedly connected to a receiving box 172, and the setting of the connecting frame 171 can fix and connect the receiving box 172, and the interior of the receiving box 172 is slidably connected to a sliding plate 173, and the bottom surface of the sliding plate 173 is fixedly connected to support springs 174 arranged at equal distances, and the bottom end of each support spring 174 is fixedly connected to the inner bottom wall of the receiving box 172, and the support spring 174 can support the sliding plate 173 upward, and the upper surface of the sliding plate 173 is fixedly connected to a flat bracket 2 175, and the setting of the flat bracket 2 175 facilitates the placement of steel bars.

Referring to Figure 6, a hair dryer 10 is fixedly connected to the welding frame 2, and an output end of the hair dryer 10 is fixedly connected to an air supply pipe 11. An air outlet nozzle 12 is installed at one end of the air supply pipe 11 away from the hair dryer 10. When welding is completed, the control panel controls the hair dryer 10 to turn on, and blows air to the welding point through the air outlet nozzle 12, which can quickly cool the welding point. A fixed column 8 is fixed on the welding frame 2, and a protective mask 9 is fixed in the middle of the fixed column 8. The setting of the protective mask 9 can protect the face of the staff when the staff is welding. The surface of the welding frame 2 is provided with an angle adjustment fixing mechanism 3.

A supporting mechanism 7 is provided below the angle adjustment fixing mechanism 3, and the supporting mechanism 7 includes a central axis rod 71 fixedly connected to the welding frame 2, and a telescopic plate 2 73 and guide telescopic rods 72 arranged at equal distances are fixedly connected to the outer surface of the central axis rod 71, and a buffer spring is installed inside the guide telescopic rod 72, and the elastic coefficient of the buffer spring is small. When the angle of the hinged rod 46 is adjusted, the buffer spring can play a role in adjusting the guide frame 74 and the rotating roller 75. A guide frame 74 is provided on the outside of the central axis rod 71, and each telescopic end of the guide telescopic rod 72 is fixedly connected to the guide frame 74, and one end of the telescopic plate 2 73 is fixedly connected to the guide frame 74. The inner wall of the guide frame 74 is rotatably connected to the rotating roller 75. The setting of the guide frame 74 and the rotating roller 75 can act as a fulcrum for the hinged rod 46.

Referring to Figures 3, 4 and 5, the angle adjustment fixing mechanism 3 also includes teeth 34 fixed on the inner wall of the angle adjustment disk 33 in a circumferential array, the outer surface of the lifting guide rod 32 is fixedly connected to a motor fixing ring 35, the inner wall of the motor fixing ring 35 is fixedly connected to a power motor 36, the output shaft of the power motor 36 is fixedly connected to an adjusting gear 37, the adjusting gear 37 is meshed with the teeth 34, when it is necessary to adjust the angle of one of the steel bars, the power motor 36 is controlled to be turned on through the control panel, the power motor 36 is turned on to drive the adjusting gear 37 to rotate, and then the angle adjustment disk 33 can be driven to rotate, the outer surface of the angle adjustment disk 33 is provided with a limiting groove 314, the inner part of the limiting groove 314 is slidably connected to a support rod 313, the end of the support rod 313 away from the angle adjustment disk 33 is fixed to the welding frame 2, and the support rod 313 supports the angle adjustment disk 33.

The angle adjustment fixing mechanism 3 includes an electric push rod 31 that can automatically control the lifting and lowering and a lifting guide rod 32 fixed at the bottom end of the electric push rod 31. When the control panel controls the electric push rod 31 to shorten, it can drive the lifting guide rod 32 to rise, so that the two steel bars can be brought closer to each other. A slide groove 38 is provided at the bottom end of the lifting guide rod 32. A conical block 1 312 is slidably connected to the inside of the slide groove 38. A conical block 2 315 is fixedly connected to the inner wall of the slide groove 38. The outer surface of the conical block 1 312 and the outer surface of the conical block 2 315 are respectively The hinge block 39 and the hinge block 311 are fixedly connected, and the upper surface of the hinge block 39 is fixedly connected with a telescopic plate 310. The upper end of the telescopic plate 310 is fixed to the bottom surface of the angle adjustment disk 33. When the angle adjustment disk 33 rotates, the hinge block 39 and the hinge rod 46 can be driven to rotate through the telescopic plate 310 to achieve the angle adjustment of the steel bar. The outer surface of the lifting guide rod 32 is sleeved with the angle adjustment disk 33, and the angle adjustment disk 33 will not rise and fall with the up and down movement of the lifting guide rod 32.

Referring to Figure 2, two symmetrical limiting mechanisms 4 are provided on the outside of the welding frame 2, and the limiting mechanism 4 also includes an L-shaped telescopic rod 41. The telescopic end of the L-shaped telescopic rod 41 is fixedly connected to a telescopic column 42, and the bottom end of the telescopic column 42 is fixedly connected to a fixing frame 43. The fixing frame 43 is fixedly connected to the upper surface of the horizontal plate 44. Through the arrangement of the L-shaped telescopic rod 41, the telescopic column 42 and the fixing frame 43, the horizontal plate 44 can always be in a horizontal state, and the steel bars will not be tilted. The upper ends of the two hinged rods 46 are hinged to the hinge block 1 39 and the hinge block 2 311 respectively. The limiting mechanism 4 includes a horizontal plate 44 and a mechanical claw 45 installed at the bottom of the horizontal plate 44. The upper surface of the horizontal plate 44 is hinged with a hinged rod 46. The mechanical claw 45 is a prior art, and its specific structure will not be repeated in this application. It can clamp the steel bars.

A connecting rod 47 is fixedly connected to the upper surface of the horizontal plate 44, and a magnet sheet 48 is fixedly connected to one end of the connecting rod 47 away from the horizontal plate 44. The two magnet sheets 48, one is a positive pole and the other is a negative pole, can attract each other when they are close to each other. When the two steel bars are close to each other, the two magnet sheets 48 gradually contact and attract each other, which can enhance the stability of the two steel bars when in contact, and facilitate the staff to weld the contact points of the two steel bars. One end of the two L-shaped telescopic rods 41 is respectively fixedly connected to a fixing rod 1 5 and a fixing rod 2 6, which are respectively fixedly connected to the angle adjustment disk 33 and the lifting guide rod 32. The setting of the fixing rod 1 5 and the fixing rod 2 6 facilitates fixing the two L-shaped telescopic rods 41 to the angle adjustment disk 33 and the lifting guide rod 32 respectively.

Working principle: At a civil construction site, when it is necessary to weld steel bars, first, place two steel bars on two steel bar horizontal placement racks 14 respectively, and place one end of the steel bar against the welding rack 2. Then, control the electric push rod 31 to extend, and the extension of the electric push rod 31 drives the horizontal plate 44 and the mechanical claw 45 to descend, and control the mechanical claw 45 to clamp and fix the steel bar through the control panel. At this time, control the electric push rod 31 to shorten, and when the electric push rod 31 shortens, it can drive the horizontal plate 44 and the mechanical claw 45 to rise, so that the two steel bars can be brought close to each other and contact each other. When it is necessary to weld the two steel bars not in a straight line, it is necessary to weld them in a non-linear direction. When welding at different angles, the power motor 36 is controlled to be turned on, and the power motor 36 is turned on to drive the adjusting gear 37 to rotate. The rotation of the adjusting gear 37 drives the angle adjusting disk 33 to rotate, and then the angle adjusting disk 33 can drive the fixing rod 5 and the limiting mechanism 4 to rotate, so that the horizontal plate 44 and the mechanical claw 45 can be adjusted in angle, so as to adjust the angle between the two steel bars. After adjusting the angle, the staff welds the contact points of the two steel bars together. The device can realize welding of two steel bars at different angles, and can adjust the angle between the two steel bars according to the needs during use. It is easy to use and has strong applicability.

The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims (10)

1. A steel bar positioning device for civil engineering, comprising a welding table (1) and a welding frame (2) fixed on the upper surface of the welding table (1), characterized in that: an angle adjustment fixing mechanism (3) is arranged on the surface of the welding frame (2), the angle adjustment fixing mechanism (3) comprises an electric push rod (31) capable of automatically controlling lifting and lowering and a lifting guide rod (32) fixed on the bottom end of the electric push rod (31), an angle adjustment disk (33) is sleeved on the outer surface of the lifting guide rod (32), two symmetrical limiting mechanisms (4) are arranged on the outside of the welding frame (2), the limiting mechanisms (4) comprise a horizontal plate (44) and a mechanical claw (45) mounted on the bottom of the horizontal plate (44), and a hinged rod (46) is hinged on the upper surface of the horizontal plate (44). 2. A steel bar positioning device for civil engineering according to claim 1, characterized in that: the angle adjustment fixing mechanism (3) further comprises teeth (34) fixed on the inner wall of the angle adjustment disk (33) in a circumferential array, the outer surface of the lifting guide rod (32) is fixedly connected with a motor fixing ring (35), the inner wall of the motor fixing ring (35) is fixedly connected with a power motor (36), the output shaft of the power motor (36) is fixedly connected with an adjusting gear (37), the adjusting gear (37) is meshed with the teeth (34), the outer surface of the angle adjustment disk (33) is provided with a limiting groove (314), the interior of the limiting groove (314) is slidably connected with a support rod (313), and the end of the support rod (313) away from the angle adjustment disk (33) is fixed to the welding frame (2). 3. A steel bar positioning device for civil engineering according to claim 1, characterized in that: a slide groove (38) is provided at the bottom end of the lifting guide rod (32), a conical block 1 (312) is slidably connected inside the slide groove (38), a conical block 2 (315) is fixedly connected to the inner wall of the slide groove (38), an outer surface of the conical block 1 (312) and an outer surface of the conical block 2 (315) are respectively fixedly connected to an articulated block 1 (39) and an articulated block 2 (311), an upper surface of the articulated block 1 (39) is fixedly connected to a telescopic plate 1 (310), and an upper end of the telescopic plate 1 (310) is fixed to the bottom surface of the angle adjustment disk (33). 4. A steel bar positioning device for civil engineering according to claim 3, characterized in that: the limiting mechanism (4) also includes an L-shaped telescopic rod (41), the telescopic end of the L-shaped telescopic rod (41) is fixedly connected to a telescopic column (42), the bottom end of the telescopic column (42) is fixedly connected to a fixing frame (43), the fixing frame (43) is fixedly connected to the upper surface of the horizontal plate (44), and the upper ends of the two hinged rods (46) are respectively hinged to the hinge block 1 (39) and the hinge block 2 (311). 5. A steel bar positioning device for civil engineering according to claim 1, characterized in that: a connecting rod (47) is fixedly connected to the upper surface of the horizontal plate (44), and a magnet sheet (48) is fixedly connected to one end of the connecting rod (47) away from the horizontal plate (44), and one end of the two L-shaped telescopic rods (41) is respectively fixedly connected to a fixing rod 1 (5) and a fixing rod 2 (6), and the fixing rod 1 (5) and the fixing rod 2 (6) are respectively fixedly connected to the angle adjustment plate (33) and the lifting guide rod (32). 6. A steel bar positioning device for civil engineering according to claim 1, characterized in that: a support mechanism (7) is arranged below the angle adjustment fixing mechanism (3), the support mechanism (7) comprises a central axis rod (71) fixedly connected to the welding frame (2), the outer surface of the central axis rod (71) is fixedly connected to a telescopic plate 2 (73) and guide telescopic rods (72) arranged at equal distances, a guide frame (74) is arranged outside the central axis rod (71), the telescopic end of each guide telescopic rod (72) is fixedly connected to the guide frame (74), one end of the telescopic plate 2 (73) is fixedly connected to the guide frame (74), and the inner wall of the guide frame (74) is rotatably connected to a rotating roller (75). 7. A steel bar positioning device for civil engineering according to claim 1, characterized in that: a hair dryer (10) is fixedly connected to the welding frame (2), the output end of the hair dryer (10) is fixedly connected to an air supply duct (11), an end of the air supply duct (11) away from the hair dryer (10) is equipped with an air outlet (12), a fixing column (8) is fixed to the welding frame (2), and a protective mask (9) is fixed to the middle of the fixing column (8). 8. A steel bar positioning device for civil engineering according to claim 1, characterized in that: the outer surface of the welding table (1) is fixedly connected to a steel bar transverse placement frame (14), the outer surface of the steel bar transverse placement frame (14) is fixedly connected to a flat bracket (16) arranged at an equal distance, the bottom surface of the steel bar transverse placement frame (14) is fixedly connected to an inclined support rod (15), the end of the inclined support rod (15) away from the steel bar transverse placement frame (14) is fixedly connected to the outer surface of the welding table (1), and a balancing mechanism (17) is provided at one end of the steel bar transverse placement frame (14). 9. A steel bar positioning device for civil engineering according to claim 8, characterized in that: the balancing mechanism (17) comprises a connecting frame (171) fixed to the bottom surface of the steel bar transverse placement frame (14), the bottom end of the connecting frame (171) is fixedly connected to a containing box (172), the interior of the containing box (172) is slidably connected to a sliding plate (173), the bottom surface of the sliding plate (173) is fixedly connected to supporting springs (174) arranged at equal distances, the bottom end of each supporting spring (174) is fixedly connected to the inner bottom wall of the containing box (172), and the upper surface of the sliding plate (173) is fixedly connected to a flat bracket 2 (175). 10. A method for positioning a steel bar for civil engineering, applicable to a steel bar positioning device for civil engineering as claimed in any one of claims 1 to 9, characterized in that it comprises the following steps: S1: placing two steel bars on two steel bar transverse placement racks (14) respectively, and placing one end of the steel bar against the welding rack (2), controlling the electric push rod (31) to extend, driving the horizontal plate (44) and the mechanical claw (45) to descend, and controlling the mechanical claw (45) to clamp and fix the steel bar through the control panel; S2: Control the electric push rod (31) to shorten, drive the horizontal plate (44) and the mechanical claw (45) to rise, so that the two steel bars approach each other and contact each other; S3: Controlling the power motor (36) to start, driving the adjusting gear (37) to rotate, the adjusting gear (37) to rotate, driving the angle adjusting disk (33) to rotate, and the angle adjusting disk (33) to rotate the fixing rod (5); S4: The fixed rod 1 (5) rotates to drive the L-shaped telescopic rod (41), the telescopic column (42), the horizontal plate (44) and the mechanical claw (45) to rotate, and at the same time, the hinge block 1 (39) and the hinge rod (46) can be driven to rotate through the telescopic plate 1 (310). When the two steel bars are rotated to a suitable position, the two steel bars are welded.