Rectangular steel pipe carrying device based on front-back swinging

Abstract

The utility model discloses a device for carrying rectangular steel pipes based on a front-back swing mode, and belongs to the technical field of steel pipe production auxiliary equipment. The device comprises four first supports, four second supports, a third support, four fourth supports, two fifth supports, a sixth support, forty-eight screws, four supporting plates, eight rolling bearings, twelve wheels, twelve hinges, sixteen screw rods and sixteen nuts. The device can achieve the purpose of carrying horizontally-arranged rectangular steel pipes and has the advantages of being low in manufacturing cost, easy to operate and good in using effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of auxiliary equipment for steel pipe production, and in particular relates to a device for transporting rectangular steel pipes based on a forward and backward swinging method. Background Art

[0002] Compared with other cross-section profiles, steel pipes have relatively high resistance to bending and torsion; compared with circular steel pipes, rectangular steel pipes have larger force-bearing area and stable structural performance. Therefore, rectangular steel pipes are widely used in the fields of mechanical manufacturing and structural engineering. At present, large steel pipes are mostly transported by lifting equipment, and steel wire ropes or nylon belts are also used. If there is a certain degree of deviation in the position of the bundled steel pipes, the steel pipes are prone to tilting or even falling off during transportation. Small steel pipes are mostly transported by transport carts. Since the structure of the transport cart is usually simple in design, the production efficiency of the transport cart is relatively low, and there are also certain safety issues. The above-mentioned transport devices are all designed for circular steel pipes, while there are very few transport devices designed for rectangular steel pipes. Therefore, it is necessary to develop a device for transporting rectangular steel pipes.

[0003] After searching, it was found that three literature patents are most relevant to the utility model technology, and the specific contents are described as follows:

[0004] Document CN 206984081 U discloses a cart for transporting steel pipes. The device is mainly composed of a front body, a base, a side body, a rear body, a fixing plate, a middle sealing plate, a bottom plate and universal wheels. The device can fix the position of the steel pipe and prevent the steel pipe from being bumped during transportation. However, the mechanization degree of the device is relatively low and the operator's physical strength is required. Therefore, the use effect of the device is not very good.

[0005] Document CN 208802024 U discloses a cart for transporting steel pipes. The device is mainly composed of a bottom plate, rollers, a first baffle plate, a second baffle plate, a cart handle, a gear lever and an elastic rope. Since the device is provided with a fixing device, it can effectively prevent the steel pipe from falling during transportation. However, the mechanization degree of the device is relatively low and the operator's physical strength is required. Therefore, the use effect of the device is not very good.

[0006] Document CN 217260079 U discloses a clamp-type trolley for transporting steel pipes. The device is mainly composed of an upper clamp bracket, a lower clamp pressure rod, a pin rod and a roller. The device has a relatively simple design structure, so the manufacturing cost is relatively low. At the same time, the mechanization degree of the device is relatively low, and the operator's physical strength is required. Therefore, the use effect of the device is not very good. Utility Model Content

[0007] In order to overcome one or more problems existing in the prior art, the utility model provides a device for transporting rectangular steel pipes based on a forward and backward swinging method. The utility model is designed based on a symmetrical structure. The use of screws can realize the linkage between the first bracket and the fifth bracket, and the linkage between the fifth bracket and the sixth bracket; the use of the fifth bracket can realize the relative setting of the first bracket, the combined use of the first bracket and the rolling bearing can realize the forward and backward swinging of the second bracket, and the combined use of the support plate, the second bracket and the screw can realize the positioning of the rectangular steel pipe; the combined use of the third bracket and the fourth bracket can realize the lifting and lowering of the sixth bracket trolley according to a predetermined trajectory, and the combined use of the third bracket trolley and the sixth bracket trolley can realize the transport of rectangular steel pipes. Therefore, the use effect of the device of the utility model is relatively good.

[0008] The technical solution adopted by the utility model to solve its technical problem is as follows.

[0009] The device for transporting rectangular steel pipes based on the front-back swinging method provided by the utility model comprises: four first brackets, four second brackets, one third bracket, four fourth brackets, two fifth brackets, one sixth bracket, forty-eight screws, four support plates, eight rolling bearings, twelve wheels, twelve hinges, sixteen screw rods and sixteen nuts;

[0010] The first bracket is composed of two first bodies and a first boss connected together, the first body and the first boss are both rectangular parallelepiped symmetrical structures, and the first boss is located between the two first bodies; a cylindrical first groove is formed on the left end surface of the first body, and the rolling bearing is penetrated in the first groove; a cylindrical first through hole is formed at the axial position of the first groove, and the bearing section of the second bracket is penetrated in the first through hole; four cylindrical second through holes are symmetrically formed on the first boss, and the screw is penetrated in the second through hole;

[0011] The second bracket is composed of a second body, two bearing sections, a second boss and a third boss. The second body, the second boss and the third boss are all rectangular parallelepiped symmetrical structures. The two bearing sections are respectively located on the left end face and the right end face of the second body, the second boss is located on the lower end face of the second body, and the third boss is located on the lower end face of the second boss. The bearing section is a cylindrical symmetrical structure, and the rolling bearing is sleeved on the bearing section. The third boss is symmetrically provided with two first screw holes, and the screws are screwed into the first screw holes.

[0012] The third bracket is composed of a third body, four fourth bosses and four fifth bosses, the third body, the fourth boss and the fifth boss are all rectangular symmetrical structures, the four fourth bosses are simultaneously located on the lower end surface of the third body, and the four fifth bosses are respectively located on the lower end surfaces of the four fourth bosses; a rectangular third through hole is provided in the middle of the third body, and the fifth bracket is penetrated in the third through hole; four groups of sixteen cylindrical fourth through holes are symmetrically provided on the third body, and the screw is penetrated in the fourth through holes; a rectangular second groove is provided on the lower end surface of the fifth boss, and the wheel is penetrated in the second groove; a cylindrical fifth through hole is provided on the left and right sides of the second groove, respectively, and the hinge is penetrated in the fifth through hole;

[0013] The fourth bracket is composed of a fourth body and a sixth boss connected together, the fourth body and the sixth boss are both rectangular parallelepiped symmetrical structures, the sixth boss is located on the upper end surface of the fourth body; the fourth body is symmetrically provided with four cylindrical sixth through holes, the screw rod is passed through the sixth through holes; the rear end surface of the sixth boss is provided with a rectangular parallelepiped third groove for guiding the wheel;

[0014] The fifth bracket is composed of a fifth body, two seventh bosses and an eighth boss, the fifth body, the seventh boss and the eighth boss are all rectangular parallelepiped symmetrical structures, the two seventh bosses are simultaneously located on the upper end surface of the fifth body, and the eighth boss is located on the lower end surface of the fifth body; a rectangular first through groove can be formed between the two seventh bosses, and the seventh body of the sixth bracket is penetrated in the first through groove; the seventh boss is symmetrically provided with four cylindrical seventh through holes, and the screw is penetrated in the seventh through hole; the eighth boss is symmetrically provided with four second screw holes, and the screw is screwed in the second screw hole;

[0015] The sixth bracket is composed of two seventh bodies and two tenth bosses, the seventh body and the tenth boss are both rectangular symmetrical structures, and the two tenth bosses are located between the two seventh bodies at the same time; the front end face and the rear end face of the seventh body are respectively provided with a rectangular second through groove, and the wheel is penetrated into the second through groove; the left and right sides of the second through groove are respectively provided with two cylindrical eighth through holes, and the hinge is penetrated into the eighth through hole; the seventh body is symmetrically provided with four third screw holes, and the screws are screwed into the third screw holes.

[0016] In some embodiments, the screw is composed of a coaxial sixth body and a ninth boss, the sixth body and the ninth boss are both cylindrical symmetrical structures, and the ninth boss is located on the right end face of the sixth body; the end of the ninth boss is provided with a thread for screwing into the first screw hole of the second bracket, the second screw hole of the fifth bracket or the third screw hole of the sixth bracket.

[0017] In some embodiments, the support plate is a symmetrical rectangular parallelepiped structure, and the support plate is symmetrically provided with four cylindrical ninth through holes, and the screws are passed through the ninth through holes.

[0018] In some embodiments, the nut is screwed onto the threaded end of the screw.

[0019] In some embodiments, the rolling bearing, the wheel, the hinge, the screw and the nut are all standard parts.

[0020] The beneficial effects of the utility model are as follows:

[0021] 1) The device for transporting rectangular steel pipes based on the front-rear swinging method provided by the utility model comprises four first brackets, four second brackets, one third bracket, four fourth brackets, two fifth brackets, one sixth bracket, forty-eight screws, four support plates, eight rolling bearings, twelve wheels, twelve hinges, sixteen screws and sixteen nuts. Since the material is common and easy to process and shape, the manufacturing cost of the device of the utility model is relatively low.

[0022] 2) When the utility model is used, first unscrew the screws from the first screw holes of the four second brackets, then pull out the sixteen screws from the ninth through holes of the four support plates, swing the four second brackets forward 90 degrees to set them horizontally, move the third bracket trolley in the horizontal direction, and move the sixth bracket trolley downward; swing the four second brackets backward 90 degrees to set them vertically, set the four support plates outside the left and right eight end faces of the third bosses of the four second brackets, pass the sixteen screws through the ninth through holes of the four support plates, and screw them into the first screw holes of the four second brackets; move the sixth bracket trolley upwards, and move the third bracket trolley horizontally. Therefore, the operation of the device of the utility model is relatively simple.

[0023] 3) The utility model is designed based on a symmetrical structure. The use of screws can realize the linkage between the first bracket and the fifth bracket, and the linkage between the fifth bracket and the sixth bracket; the use of the fifth bracket can realize the relative setting of the first bracket, the joint use of the first bracket and the rolling bearing can realize the forward and backward swinging of the second bracket, and the joint use of the support plate, the second bracket and the screws can realize the positioning of the rectangular steel pipe; the joint use of the third bracket and the fourth bracket can realize the lifting and lowering of the sixth bracket vehicle according to a predetermined trajectory, and the joint use of the third bracket vehicle and the sixth bracket vehicle can realize the transportation of the rectangular steel pipe. Therefore, the use effect of the device of the utility model is relatively good.

[0024] The device for transporting rectangular steel pipes based on the front-back swinging method provided by the utility model can achieve the purpose of transporting horizontally arranged rectangular steel pipes. The device of the utility model has the characteristics of low manufacturing cost, simple operation and good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the main structure of the device for transporting rectangular steel pipes based on the front-back swinging method of the utility model when the second bracket is arranged horizontally;

[0026] Figure 2 It is a left-side structural schematic diagram of the device for transporting rectangular steel pipes based on the front-rear swinging method of the utility model when the second bracket is arranged horizontally;

[0027] Figure 3 It is a schematic diagram of the main structure of the device for transporting rectangular steel pipes based on the front-back swinging method of the utility model when the second bracket is erected;

[0028] Figure 4 It is a left-side structural schematic diagram of the device for transporting rectangular steel pipes based on the front-rear swinging method of the utility model when the second bracket is erected;

[0029] Figure 5 It is a schematic diagram of the top view of the structure of the device for transporting rectangular steel pipes based on the front-back swinging method of the utility model when the second bracket is erected;

[0030] Figure 6 It is a left-side structural schematic diagram of the first bracket of the utility model;

[0031] Figure 7 It is a schematic diagram of the top view of the structure of the first bracket of the utility model;

[0032] Figure 8 This is a schematic diagram of the main structure of the second bracket of the utility model;

[0033] Fig. 9 It is a left-side structural schematic diagram of the second bracket of the utility model;

[0034] Fig.10 This is a schematic diagram of the main structure of the third bracket and the wheel after being assembled in the utility model;

[0035] Fig.11 It is a left-side structural schematic diagram of the third bracket and the wheel of the utility model after being assembled;

[0036] Fig.12 This is a bottom view of the structure after the third bracket and the wheels of the utility model are assembled;

[0037] Fig.13 This is a schematic diagram of the main structure of the fourth bracket of the utility model;

[0038] Fig.14 It is a schematic diagram of the top view of the structure of the fourth bracket of the utility model;

[0039] Fig.15 This is a schematic diagram of the main structure of the fifth bracket of the utility model;

[0040] Fig.16 It is a left-side structural schematic diagram of the fifth bracket of the utility model;

[0041] Fig.17 This is a schematic diagram of the main structure of the screw of the utility model;

[0042] Fig.18 This is a schematic diagram of the main structure of the sixth bracket and the wheel after being assembled in the utility model;

[0043] Fig.19 It is a left-side structural schematic diagram of the sixth bracket and the wheel of the utility model after being assembled;

[0044] Fig. 20 It is a schematic diagram of the top view of the sixth bracket and the wheel after being assembled in the utility model;

[0045] Fig.21 It is a left-side structural schematic diagram of the support plate of the utility model;

[0046] Fig. 22 It is a schematic diagram of the forward swing of the second bracket of the utility model when it changes from a vertical setting to a horizontal setting;

[0047] Fig.23 It is a schematic diagram of reverse swinging when the second bracket of the utility model changes from a horizontal setting to a vertical setting.

[0048] Description of reference numerals: 1-first bracket; 101-first body; 102-first boss; 103-first groove; 104-first through hole; 105-second through hole; 2-second bracket; 201-second body; 202-bearing section; 203-second boss; 204-third boss; 205-first screw hole; 3-third bracket; 301-third body; 302-fourth boss; 303-fifth boss; 304-third through hole; 305-fourth through hole; 306-second groove; 307-fifth through hole; 4-fourth bracket; 401-fourth body; 402-sixth boss; 403-sixth through hole; 404-third groove; 5-fifth bracket; 501-fifth body; 502-seventh boss; 503-eighth boss; 504-first through groove; 505-seventh through hole; 506-second screw hole; 6-screw; 601-sixth body; 602-ninth boss; 7-sixth bracket; 701-seventh body; 702-tenth boss; 703-second through groove; 704-eighth through hole; 705-third screw hole; 8-support plate; 801-ninth through hole; 9-rolling bearing; 10-wheel; 11-hinge; 12-screw; 13-nut; 14-rectangular steel pipe. DETAILED DESCRIPTION

[0049] The content of the utility model is described in detail below through examples and drawings. The examples are only used to understand the utility model, but are not intended to limit the content of the utility model.

[0050] Combination Figures 1 to 5As shown, the utility model provides a device for transporting rectangular steel pipes based on front-back swinging, which includes four first brackets 1, four second brackets 2, a third bracket 3, four fourth brackets 4, two fifth brackets 5, a sixth bracket 7, forty-eight screws 6, four support plates 8, eight rolling bearings 9, twelve wheels 10, twelve hinges 11, sixteen screws 12 and sixteen nuts 13; wherein, the four fourth brackets 4 are arranged on the third body 301 of the third bracket 3 in pairs, and are connected by the sixteen screws 12 and the sixteen nuts 13; eight wheels 10 roll in the four third grooves 404 of the four fourth brackets 4, and the eight wheels 10 are inserted in the four second through grooves 703 of the sixth bracket 7, and are hinged by the eight hinges 11; the sixth bracket The two seventh bodies 701 of 7 are penetrated in the two first through grooves 504 of the two fifth brackets 5, and are connected by the sixteen screws 6; the two eighth bosses 503 of the two fifth brackets 5 are penetrated between the four first bosses 102 of the four first brackets 1 that are opposite to each other, and are connected by the sixteen screws 6; the eight rolling bearings 9 are penetrated in the eight first grooves 103 of the four first brackets 1, and the eight bearing segments 202 of the four second brackets 2 are penetrated in the eight rolling bearings 9; the four third bosses 204 of the four second brackets 2 are penetrated between the four support plates 8 that are opposite to each other, and are connected by the sixteen screws 6; the four wheels 10 are penetrated in the four second grooves 306 of the third bracket 3, and are hinged by the four hinges 11.

[0051] The assembly process of the device for transporting rectangular steel pipes based on the front-rear swinging method provided by the utility model is as follows:

[0052] Combination Figures 1 to 21 As shown, firstly, four wheels 10 are inserted into the four second grooves 306 of one third bracket 3, and the four axial holes of the four wheels 10 are aligned with the four fifth through holes 307 of the third bracket 3, and then four hinges 11 are installed in the four groups of aligned through holes, so that one third bracket 3 and four wheels 10 can be assembled into a third bracket vehicle;

[0053] Then, eight wheels 10 are inserted into the four second through slots 703 of one sixth bracket 7, and the eight axial holes of the eight wheels 10 are aligned with the eight eighth through holes 704 of the sixth bracket 7, and then eight hinges 11 are installed in the eight groups of aligned through holes, so that one sixth bracket 7 and eight wheels 10 can be assembled into a sixth bracket vehicle;

[0054] Then, the four fourth brackets 4 are arranged opposite to each other in pairs on the third body 301 of the third bracket 3, ensuring that the third grooves 404 of the four fourth brackets 4 are arranged opposite to each other, and the sixteen sixth through holes 403 of the four fourth brackets 4 and the sixteen fourth through holes 305 of the third bracket 3 are aligned, and then sixteen screw rods 12 are passed through the sixteen groups of aligned through holes, and then sixteen nuts 13 are screwed on the threaded ends of the sixteen screw rods 12, so that the four fourth brackets 4 and the third bracket 3 can be assembled;

[0055] Then, the eight wheels 10 installed on the sixth bracket 7 are simultaneously rolled into the four third grooves 404 of the four fourth brackets 4, and then the two seventh bodies 701 of the sixth bracket 7 are inserted into the two first through grooves 504 of the two fifth brackets 5, and the sixteen seventh through holes 505 of the two fifth brackets 5 are aligned with the eight third screw holes 705 of the sixth bracket 7, and then the sixteen screws 6 are passed through the sixteen seventh through holes 505 and screwed into the eight third screw holes 705, so that the two fifth brackets 5 and the sixth bracket 7 can be assembled;

[0056] Then, eight rolling bearings 9 are installed in the eight first grooves 103 of the four first brackets 1, and then the four first brackets 1 are arranged opposite to each other in pairs, and then the eight bearing segments 202 at both ends of the four second brackets 2 are inserted into the eight rolling bearings 9, so that the four first brackets 1, the eight rolling bearings 9 and the four second brackets 2 can be assembled;

[0057] Then, the two eighth bosses 503 of the two fifth brackets 5 are inserted between the four first bosses 102 of the four first brackets 1, and the sixteen second through holes 105 of the four first brackets 1 and the eight second screw holes 506 of the two fifth brackets 5 are aligned, and then the sixteen screws 6 are passed through the sixteen second through holes 105 and screwed into the eight second screw holes 506, so that the four first brackets 1 and the two fifth brackets 5 can be assembled;

[0058] Then, the four support plates 8 are arranged outside the left and right eight end surfaces of the four third bosses 204 of the four second brackets 2, and the sixteen ninth through holes 801 of the four support plates 8 and the eight first screw holes 205 of the four second brackets 2 are aligned, and then the sixteen screws 6 are passed through the sixteen ninth through holes 801 and screwed into the eight first screw holes 205. In this way, the whole device is assembled and can be put into use.

[0059] The setting principle of the swing direction of the second bracket of the device for transporting rectangular steel pipes based on the front-back swing type provided by the utility model is:

[0060] like Figure 2 and Figure 4 As shown, based on the left-side structural schematic diagram of the device of the utility model, for the convenience of description, the two second brackets 2 at the front are set as A, the two second brackets 2 at the back are set as B, and the eight bearing sections 202 of the four second brackets 2 are all swing axes; Figure 4 As shown, it is assumed that the four second brackets 2 are initially in an upright position, and after simplification, Fig. 22 As shown, the two A's simultaneously swing 90 degrees in the clockwise direction, and the two B's simultaneously swing 90 degrees in the counterclockwise direction, then the four second brackets 2 are all in a horizontal arrangement, and the swing direction of the second bracket 2 is set to be the positive direction; as shown Figure 2 As shown, it is assumed that the four second brackets 2 are initially in a horizontal arrangement, and after simplification, Fig.23 As shown, the two A's simultaneously swing 90 degrees in the counterclockwise direction, and the two B's simultaneously swing 90 degrees in the clockwise direction, then the four second brackets 2 are all in an upright position, and the swinging direction of the second bracket 2 is set to the reverse direction.

[0061] The use method of the device for transporting rectangular steel pipes based on the front-back swinging type provided by the utility model is as follows:

[0062] Step 1: First, unscrew the eight first screw holes 205 of the four second brackets 2, and then extract the sixteen screws 6 from the sixteen ninth through holes 801 of the four support plates 8, so as to remove the four support plates 8; then swing the four second brackets 2 forward 90 degrees, so that the four second brackets 2 are all arranged horizontally, and then move the third bracket car in the horizontal direction, and then move the sixth bracket car downward, so that the four second brackets 2 are all located directly above the rectangular steel pipe 14, as shown in FIG. Figure 1 and Figure 2 As shown;

[0063] Step 2: Then, the four second brackets 2 are swung 90 degrees in the opposite direction, so that the four second brackets 2 are all arranged vertically, ensuring that the four third bosses 204 of the four second brackets 2 are all located directly below the rectangular steel tube 14, and then the four support plates 8 are arranged outside the eight left and right end faces of the four third bosses 204 of the four second brackets 2, and the sixteen ninth through holes 801 of the four support plates 8 are aligned with the eight first screw holes 205 of the four second brackets 2, and then the sixteen screws 6 are passed through the sixteen ninth through holes 801 and screwed into the eight first screw holes 205;

[0064] Step 3: Then move the sixth support vehicle upwards to simultaneously raise the four second supports 2 and the rectangular steel pipe 14 to a certain height, and then move the third support vehicle horizontally to transport the rectangular steel pipe 14 to a suitable position, such as Figures 3 to 5 shown.

[0065] Supplementary explanation: The device for transporting rectangular steel pipes based on the front and rear swinging method provided by the utility model is designed with a symmetrical structure. First, according to the outer diameter specifications of the rectangular steel pipe, the setting height of the rectangular steel pipe and the fixed length of the rectangular steel pipe, multiple specifications of the device of the utility model should be designed and manufactured to match them.

[0066] It can be seen from the embodiments that the device for transporting rectangular steel pipes based on the forward and backward swinging method provided by the utility model can achieve the purpose of transporting horizontally arranged rectangular steel pipes. The device of the utility model has the characteristics of low manufacturing cost, simple operation and good use effect.

[0067] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein.

Claims

1. A device for transporting rectangular steel pipes based on a forward and backward swinging motion, characterized in that: The device for transporting rectangular steel pipes based on the forward and backward swinging method comprises: four first brackets (1), four second brackets (2), one third bracket (3), four fourth brackets (4), two fifth brackets (5), one sixth bracket (7), forty-eight screws (6), four support plates (8), eight rolling bearings (9), twelve wheels (10), twelve hinges (11), sixteen screw rods (12) and sixteen nuts (13), wherein: The first bracket (1) is composed of two first bodies (101) and a first boss (102) connected together, the first bodies (101) and the first boss (102) are both rectangular parallelepiped symmetrical structures, and the first boss (102) is located between the two first bodies (101); a first cylindrical groove (103) is provided on the left end surface of the first body (101), and the rolling bearing (9) is inserted into the first groove (103); a first cylindrical through hole (104) is provided at the axial position of the first groove (103), and the bearing section (202) of the second bracket (2) is inserted into the first through hole (104); four second cylindrical through holes (105) are symmetrically provided on the first boss (102), and the screw (6) is inserted into the second through hole (105); The second bracket (2) is composed of a second body (201), two bearing sections (202), a second boss (203) and a third boss (204) connected together; the second body (201), the second boss (203) and the third boss (204) are all rectangular parallelepiped symmetrical structures; the two bearing sections (202) are respectively located on the left end surface and the right end surface of the second body (201); the second boss (203) is located on the lower end surface of the second body (201); the third boss (204) is located on the lower end surface of the second boss (203); the bearing section (202) is a cylindrical symmetrical structure; the bearing section (202) is sleeved with the rolling bearing (9); the third boss (204) is symmetrically provided with two first screw holes (205); the screws (6) are screwed into the first screw holes (205); The third bracket (3) is composed of a third body (301), four fourth bosses (302) and four fifth bosses (303) connected together; the third body (301), the fourth bosses (302) and the fifth bosses (303) are all rectangular parallelepiped symmetrical structures; the four fourth bosses (302) are simultaneously located on the lower end surface of the third body (301); the four fifth bosses (303) are respectively located on the lower end surfaces of the four fourth bosses (302); a third rectangular through hole (304) is provided in the middle of the third body (301); the third through hole (304) is provided in the middle of the third body (301); The fifth bracket (5) is inserted into the hole (304); the third body (301) is symmetrically provided with four groups of sixteen cylindrical fourth through holes (305), and the screw rod (12) is inserted into the fourth through holes (305); the lower end surface of the fifth boss (303) is provided with a rectangular second groove (306), and the wheel (10) is inserted into the second groove (306); the left and right sides of the second groove (306) are respectively provided with a cylindrical fifth through hole (307), and the hinge (11) is inserted into the fifth through hole (307); The fourth bracket (4) is composed of a fourth body (401) and a sixth boss (402) connected together, the fourth body (401) and the sixth boss (402) are both rectangular parallelepiped symmetrical structures, and the sixth boss (402) is located on the upper end surface of the fourth body (401); the fourth body (401) is symmetrically provided with four cylindrical sixth through holes (403), and the screw (12) is passed through the sixth through holes (403); the rear end surface of the sixth boss (402) is provided with a rectangular parallelepiped third groove (404) for guiding the wheel (10); The fifth bracket (5) is composed of a fifth body (501), two seventh bosses (502) and an eighth boss (503) connected together; the fifth body (501), the seventh boss (502) and the eighth boss (503) are all rectangular parallelepiped symmetrical structures; the two seventh bosses (502) are simultaneously located on the upper end surface of the fifth body (501), and the eighth boss (503) is located on the lower end surface of the fifth body (501); the two seventh bosses (50 2) can form a first rectangular through groove (504), the first through groove (504) is penetrated by the seventh body (701) of the sixth bracket (7); the seventh boss (502) is symmetrically provided with four seventh cylindrical through holes (505), the seventh through holes (505) are penetrated by the screws (6); the eighth boss (503) is symmetrically provided with four second screw holes (506), the second screw holes (506) are screwed with the screws (6); The sixth bracket (7) is composed of two seventh bodies (701) and two tenth bosses (702) connected together, the seventh body (701) and the tenth boss (702) are both rectangular parallelepiped symmetrical structures, and the two tenth bosses (702) are simultaneously located between the two seventh bodies (701); the front end face and the rear end face of the seventh body (701) are respectively provided with a rectangular parallelepiped second through groove (703), and the wheel (10) is penetrated in the second through groove (703); the left and right sides of the second through groove (703) are respectively provided with two cylindrical eighth through holes (704), and the hinge (11) is penetrated in the eighth through hole (704); the seventh body (701) is symmetrically provided with four third screw holes (705), and the screws (6) are screwed in the third screw holes (705).

2. The device for transporting rectangular steel pipes based on the forward and backward swinging method according to claim 1 is characterized in that: The screw (6) is composed of a coaxial sixth body (601) and a ninth boss (602), the sixth body (601) and the ninth boss (602) are both cylindrical symmetrical structures, and the ninth boss (602) is located on the right end surface of the sixth body (601); the end of the ninth boss (602) is provided with a thread for screwing into the first screw hole (205) of the second bracket (2), the second screw hole (506) of the fifth bracket (5) or the third screw hole (705) of the sixth bracket (7).

3. The device for transporting rectangular steel pipes based on the forward and backward swinging method according to claim 1 is characterized in that: The support plate (8) is a rectangular parallelepiped symmetrical structure, and the support plate (8) is symmetrically provided with four cylindrical ninth through holes (801), and the screws (6) are passed through the ninth through holes (801).

4. The device for transporting rectangular steel pipes based on the forward and backward swinging method according to claim 1 is characterized in that: The threaded end of the screw rod (12) is screwed with the nut (13).

5. The device for transporting rectangular steel pipes based on the forward and backward swinging method according to claim 1 is characterized in that: The rolling bearing (9), the wheel (10), the hinge (11), the screw rod (12) and the nut (13) are all standard parts.

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