Steel truss and butt joint auxiliary equipment thereof

Abstract

The invention belongs to the technical field of steel trusses, and discloses a steel truss and butt joint auxiliary equipment thereof, the steel truss comprises an upper truss, a lower truss and reinforcing ribs used for connecting the upper truss and the lower truss, and the upper truss, the lower truss and the reinforcing ribs are all made of composite materials; the invention relates to a preparation method of an anti-aging agent. The composite material is prepared from the following raw materials in parts by weight: 65 to 80 parts of steel powder, 0.002 to 0.008 part of boron-rare earth composite additive, 4 to 9 parts of sodium bentonite grafted ethylene propylene diene monomer, 3 to 7 parts of graphene-montmorillonite composite modified self-adhesive asphalt, 3 to 6 parts of short carbon fiber, 0.6 to 1.8 parts of silane coupling agent, 1.5 to 4.5 parts of zinc phosphate, 1.5 to 4.5 parts of nano silicon dioxide, 0.3 to 0.9 part of antioxidant and 0.4 to 1.2 parts of zinc stearate. 0.8 to 1.5 parts of borax and 0.5 to 1.2 parts of nano titanium dioxide. The steel truss has excellent mechanical properties, corrosion resistance, water resistance, self-repairing capability, processing formability and service durability.

Description

Technical Field

[0001] This invention relates to the field of steel truss technology, and in particular to a steel truss and its docking auxiliary equipment. Background Technology

[0002] Steel trusses, as a lightweight and high-strength load-bearing structure, are widely used in construction engineering, bridge construction, and machinery equipment. Their core requirements are structural stability, mechanical load-bearing capacity, and service durability, while the precision of the connections directly affects the overall structural stress balance. Existing steel trusses are mostly made from traditional steel materials. To facilitate transportation, they are typically manufactured as short truss units, which are then connected by welding or bolts during use.

[0003] In complex service environments (such as humid, corrosive media, and frequent stress scenarios), steel trusses in existing general technologies are prone to the initiation and propagation of microcracks. Furthermore, the corrosion resistance and self-repair capabilities of traditional steel are limited, leading to a shortened service life of the structure. At the same time, the lack of adaptable auxiliary positioning structures during the steel truss docking process makes it difficult to ensure docking accuracy and installation efficiency, thereby affecting the mechanical synergy of the overall structure and failing to fully meet the high standards required for the comprehensive performance of steel trusses in the engineering field. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a steel truss and its docking auxiliary equipment, enabling the steel truss to possess excellent mechanical properties, corrosion and water resistance, self-healing ability, processability, and service durability.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a steel truss, comprising an upper truss, a lower truss, and reinforcing ribs for connecting the upper truss and the lower truss, wherein the upper truss, the lower truss, and the reinforcing ribs are all made of composite materials; the raw materials of the composite material, by weight, include: 65-80 parts of steel powder, 0.002-0.008 parts of boron-rare earth composite additive, 4-9 parts of sodium-based bentonite-grafted EPDM rubber, 3-7 parts of graphene-montmorillonite composite modified self-adhesive asphalt, 3-6 parts of chopped carbon fiber, 0.6-1.8 parts of silane coupling agent, 1.5-4.5 parts of zinc phosphate, 1.5-4.5 parts of nano-silica, 0.3-0.9 parts of antioxidant, 0.4-1.2 parts of zinc stearate, 0.8-1.5 parts of borax, and 0.5-1.2 parts of nano-titanium dioxide.

[0006] By adopting the above technical solutions, steel powder, as the core substrate, provides basic load-bearing capacity and structural stability; boron-rare earth composite additives refine the steel matrix grains to improve strength and weldability; sodium-based bentonite grafted onto EPDM rubber enables microcrack self-repair and improves organic-inorganic interface compatibility; graphene-montmorillonite composite modified self-adhesive asphalt constructs a synergistic anti-corrosion and waterproof system and enhances mechanical strength; chopped carbon fibers inhibit crack propagation to improve tensile strength and fatigue resistance; silane coupling agents strengthen the interfacial bonding between the organic and inorganic phases; zinc phosphate forms a chemical passivation film to inhibit electrochemical corrosion; nano-silica fills pores to improve material density and wear resistance; antioxidants delay the thermo-oxidative aging of organic components to extend service life; zinc stearate optimizes processing fluidity to ensure molding uniformity; and borax and nano-titanium dioxide further assist in improving material stability and comprehensive performance. Under the synergistic effect of each component, the steel truss possesses excellent mechanical properties, anti-corrosion and waterproof performance, self-repair capability, processability, and service durability.

[0007] Furthermore, the steel powder is Q355B type steel powder, and the boron-rare earth composite additive is composed of boron and rare earth (Ce / La) in a mass ratio of 1:1; the length of the short-cut carbon fiber is 4-12mm and the diameter is 6-11μm; the silane coupling agent is one of KH-550, KH-560 or KH-570, and the antioxidant is one of antioxidant 1076, antioxidant 1010 or antioxidant 168; the particle size of nano silica is 15-45nm, the particle size of borax is 50-100μm, and the particle size of nano titanium dioxide is 10-30nm.

[0008] By adopting the above technical solutions, Q355B steel powder provides basic load-bearing capacity and structural stability for steel trusses. Boron-rare earth composite additives, which are compounded with boron and rare earth (Ce / La) in a 1:1 mass ratio, can refine the grains of the steel matrix and improve hardenability. Short-cut carbon fibers with a length of 4-12mm and a diameter of 6-11μm can inhibit the propagation of macroscopic cracks to improve tensile strength and fatigue resistance. Silane coupling agents KH-550, KH-560, or KH-570 can act as interface bridges to improve the compatibility of organic and inorganic phases. Antioxidant 1076, antioxidant 1010, or antioxidant 168 can inhibit the thermo-oxidative aging of organic components. Nano-silica with a particle size of 15-45nm can fill pores to improve the density of the material. Borax with a particle size of 50-100μm and nano-titanium dioxide with a particle size of 10-30nm work synergistically to optimize the comprehensive performance of the material. All components work together to ensure the strength, stability, and service life of the steel truss.

[0009] Furthermore, by weight, the raw materials for sodium-based bentonite-grafted EPDM rubber include: 90-100 parts sodium-based bentonite, 60-80 parts EPDM rubber, 8-12 parts maleic anhydride, 1.0-1.8 parts benzoyl peroxide, 3-6 parts silane coupling agent KH-570, 1.5-3.0 parts sulfur, 0.3-0.8 parts accelerator (tetramethylthiuram disulfide), and 1.0-2.0 parts stearic acid; The preparation method of sodium-based bentonite grafted EPDM rubber includes the following steps: 1) Dry sodium-based bentonite at 110-125℃ for 3-5 hours, add 8wt% sodium chloride solution and stir for 2.5-3.5 hours, filter and wash with deionized water until no chloride ions are present, vacuum dry at 100-110℃ for 4-6 hours, then add it together with silane coupling agent KH-570 into a high-speed mixer and mix at 80-90℃ and a speed of 600-700 r / min for 15-20 minutes to obtain modified bentonite; 2) Put EPDM rubber into a two-roll mill and plasticize it at 110-130℃ for 8-12 minutes. Add maleic anhydride and benzoyl peroxide and mix it at 125-140℃ at a speed of 40-60 r / min for 25-35 minutes. 3) Cool the material obtained in 2) to 115-125℃, add sulfur, accelerator and stearic acid first, mix for 5-8 minutes, then add the modified bentonite obtained in 1), mix at 135-150℃ and 50-70 r / min for 30-40 minutes to obtain the mixture. 4) Transfer the mixture into a flat vulcanizing machine and vulcanize it for 18-22 minutes at 170-190℃ and 6-9MPa. After the vulcanized product is cooled to room temperature, it is crushed with a high-speed pulverizer and passed through a 230-250 mesh sieve to obtain sodium-based bentonite-grafted EPDM rubber.

[0010] By adopting the above technical solution, benzoyl peroxide as an initiator can initiate the grafting reaction between maleic anhydride and EPDM rubber. Silane coupling agent KH-570 modifies the surface of sodium bentonite to promote its interfacial bonding with the grafted EPDM rubber. Sulfur, accelerator tetramethylthiuram disulfide, and stearic acid work together to achieve system vulcanization. The resulting sodium bentonite-grafted EPDM rubber combines the structural characteristics of sodium bentonite with the elasticity of EPDM rubber, and the interfacial compatibility between the components is effectively improved.

[0011] Furthermore, by weight, the raw materials of the graphene-montmorillonite composite modified self-adhesive asphalt include: 90-100 parts of 70# self-adhesive rubber asphalt, 2-5 parts of graphene, 4-8 parts of organomontmorillonite, 0.08-0.15 parts of sulfur, and 2-4 parts of dibutyl phthalate. The preparation method of graphene-montmorillonite composite modified self-adhesive asphalt includes the following steps: 1) Melt the rubber asphalt at 155-165℃ for 40-50 minutes, filter to remove mechanical impurities, then add graphene and dibutyl phthalate, heat to 160-170℃, and shear and stir at a high speed of 800-1000r / min, while simultaneously turning on 400-600W intermittent ultrasonic (working for 30s-60s, pausing for 10-20s) for 30-40 minutes; 2) Add organomontmorillonite to the material obtained in 1), heat to 175-185℃, increase the shear rate to 1200-1600r / min, and maintain intermittent ultrasonication at 400-600W for 50-70min. 3) Cool the material obtained in 2) to 165-175℃, add sulfur, and stir at a speed of 250-350r / min for 25-35min to obtain graphene-montmorillonite composite modified self-adhesive asphalt.

[0012] By adopting the above technical solution, 70# self-adhesive rubber asphalt provides waterproof sealing and creep properties as the base, dibutyl phthalate assists graphene to achieve uniform dispersion, graphene and organomontmorillonite exfoliated by high-speed shearing and intermittent ultrasonication form a physical barrier network to improve mechanical strength and impermeability, and sulfur ensures the stability of the system. The final graphene-montmorillonite composite modified self-adhesive asphalt has waterproof, anti-corrosion and reinforcing properties, and the synergistic optimization of each component optimizes the overall performance of the material.

[0013] Furthermore, the preparation method of the composite material includes the following steps: S1. Raw material pretreatment: a. Dry Q355B steel powder at 110-125℃ for 3-5 hours, controlling the moisture content to ≤0.25%; b. Dry the chopped carbon fibers at 85-105℃ for 1.5-2.5 hours; c. Dry the boron-rare earth composite additive at 120-130℃ for 1-2 hours; d. After mixing borax with nano titanium dioxide, dry at 80-100℃ for 1-2 hours; S2, Component Mixing: a. Add the pretreated Q355B steel powder, boron-rare earth composite additive, and short-cut carbon fiber to a high-speed mixer and mix at 700-900 r / min at 90-110℃ for 20-30 min. b. Add sodium-based bentonite-grafted EPDM rubber, graphene-montmorillonite composite modified self-adhesive asphalt, zinc phosphate, nano silica, borax and nano titanium dioxide to the mixture obtained in step a. Mix at 85-105℃ and 600-800 r / min for 25-35 min. Then add silane coupling agent, antioxidant and zinc stearate. Mix at 65-85℃ and 350-550 r / min for 12-18 min to obtain the mixture. S3, Product Forming: a. Preheat the upper truss, lower truss and stiffener forming molds to 145-165℃ respectively, and coat the inner wall with release agent; b. Load the mixture obtained in step b of S2 into three molding molds, press them to 25-35MPa using a molding press, hold the pressure for 20-30min, and obtain the preformed blank; c. Transfer the preformed blank along with the mold into an argon-protected sintering furnace, heat it to 650-750℃ at a rate of 5-8℃ / min, hold it for 120-180min, then adjust the temperature to 600-700℃, apply 15-25MPa axial secondary pressure to the mold, hold the pressure for 60-90min, then cool it down to 300℃ at a rate of 3-5℃ / min, and finally allow it to cool naturally to room temperature and demold to obtain the upper truss, lower truss and reinforcing rib blanks; d. Assemble the upper truss, lower truss, and reinforcing rib blanks into a steel truss and weld them at the connection points. Remove burrs from the surface of the blanks. Then, evenly coat the surface of the steel truss with a 60-90μm thick epoxy zinc-rich primer and cure it at 150-170℃ for 2-3 hours. Next, coat it with a 0.2-0.4mm thick graphene-montmorillonite composite modified self-adhesive asphalt layer and cure it at room temperature for 24-36 hours to obtain the finished steel truss.

[0014] By adopting the above technical solutions, raw materials such as Q355B steel powder, boron-rare earth composite additives, and chopped carbon fibers undergo targeted drying pretreatment to avoid the impact of moisture and agglomeration on molding quality. The step-by-step temperature-controlled mixing process ensures uniform dispersion of each component and improves compatibility. The combination of mold preheating and compression molding with argon-protected sintering and secondary pressurization reduces oxidation, eliminates internal stress, and improves material density. After welding and assembly, the steel truss is subjected to a double-layer protective treatment of epoxy zinc-rich primer and graphene-montmorillonite composite modified self-adhesive asphalt layer, ultimately giving the finished steel truss excellent mechanical properties, structural stability, and corrosion and water resistance.

[0015] This invention also discloses a docking auxiliary device for steel trusses, used for docking the aforementioned steel trusses, including a base plate, a clamping mechanism, and a docking mechanism. The clamping mechanism is used to fix the base plate to the upper truss of two sets of parallel steel trusses. The docking mechanism includes an installation component, a connecting component, and a driving component. The installation component includes a fixed column, a connecting frame, a swing arm, and a guide rail. The fixed column is fixed to the top of the base plate, and the connecting frame is fixed to one side of the base plate. One end of the swing arm is hinged to the connecting frame, and the other end is hinged to the bottom of the guide rail near the fixed column. The guide rail is horizontally set, and there are two swing arms that are parallel to each other. The connecting component is movably set on the guide rail and used to connect the upper truss and the lower truss to be docked. The driving component is used to lift the guide rail and drive the upper truss to be docked to complete the docking with the upper truss at the bottom of the base plate, while simultaneously enabling the lower truss to be docked to complete the docking with the lower truss below the base plate.

[0016] By adopting the above technical solution, the clamping mechanism can firmly fix the base plate to the upper truss of the two sets of parallel steel trusses, providing a reliable reference support for the docking of the steel trusses; the two parallel swing arms are hinged to the guide rail, which can ensure that the guide rail remains horizontal during the lifting process and avoid tilting or shifting during the docking of the steel trusses; the connecting components that are movably set on the guide rail can flexibly adapt to the connection requirements of the upper and lower trusses to be docked, and in conjunction with the lifting action of the drive component on the guide rail, can synchronously drive the upper truss to be docked to the upper truss at the bottom of the base plate and the lower truss to be docked to the lower truss below the base plate for precise docking. Through the coordinated cooperation of the mechanical structure, the stability and docking accuracy of the steel truss docking process are effectively guaranteed, and the synchronous and precise docking of the upper and lower trusses is achieved.

[0017] Furthermore, the connecting assembly includes a linkage unit, a clamping unit, and an adjusting unit. The linkage unit includes a sliding seat, a movable seat, a linkage rod, and a traction rod. The sliding seat slides with the guide rail, and the movable seat is located below the guide rail and flush with the connecting frame. There are two pairs of linkage rods, each pair consisting of two parallel rods. The two pairs of linkage rods are symmetrically distributed about the movable seat and hinged to it. One pair of linkage rods is hinged to the bottom of the guide rail near the swing arm, while the other pair is hinged to the sliding seat. The swing rod is parallel to the linkage rod on the side furthest from the fixed post. The traction rod... One end is hinged to the sliding seat, and two traction rods are provided and are parallel to each other; the clamping units are arranged in groups and connected to the upper truss and the lower truss respectively, and include an L-shaped movable plate, an L-shaped clamping plate, a fixed plate and a connecting plate; the inner side of the L-shaped movable plate and the inner side of the L-shaped clamping plate are adapted to the outer side of the upper truss or the lower truss, the L-shaped movable plate is hinged to the two pairs of linkage rods, and the L-shaped clamping plate is hinged to the L-shaped movable plate; the fixed plate is fixed on the L-shaped movable plate, the connecting plate is fixed on the L-shaped clamping plate, and the connecting plate and the fixed plate are detachably connected; the adjustment unit is used to adjust the distance between the L-shaped movable plates in the two sets of clamping units.

[0018] By adopting the above technical solution, the distance between the L-shaped movable plates in the two sets of clamping units can be adjusted by the adjustment unit. The L-shaped clamping plate and the L-shaped movable plate can clamp the upper and lower trusses to be connected (in order to enhance the fixing effect of the clamping unit on the upper or lower truss, fastening bolts for abutting the upper or lower truss can be set on the L-shaped movable plate). After the upper and lower trusses are fixed, the operator only needs to lift the guide rail by the drive component, which will change the angle between the swing arm and the guide rail. Since the movable seat is flush with the connecting frame, the swing rod and the linkage rod on the side away from the fixed column are parallel to each other, and the sliding seat slides with the guide rail, the sliding seat moves along the guide rail toward the side closer to the fixed column, thereby causing the upper and lower trusses clamped by the clamping unit to move toward the side closer to the fixed column. When the upper truss abuts the upper truss corresponding to the bottom plate (the position of this upper truss is relatively fixed), the operator can perform the welding operation of the two upper trusses or the two lower trusses, which speeds up the operator's progress in connecting the steel trusses.

[0019] Furthermore, the adjustment unit includes an upper U-shaped frame, a lower U-shaped frame, a guide rod, and an adjustment bolt. The upper U-shaped frame is fixed to the upper L-shaped movable plate, and the lower U-shaped frame is fixed to the lower L-shaped movable plate. The guide rod is fixed to the lower U-shaped frame, passes through the upper U-shaped frame, and slides with it. The adjustment bolt is rotatably connected to the lower U-shaped frame, passes through the upper U-shaped frame, and is threaded with it.

[0020] By adopting the above technical solution, after the operator tightens the adjusting bolt, the upper U-shaped frame can be controlled to move towards or away from the lower U-shaped frame, so that the two L-shaped movable plates move closer or further away from each other. This facilitates the upper and lower trusses, which are fixed by the two sets of clamping units, to move closer or further away from each other, so that this equipment can be used for steel trusses of different specifications.

[0021] Furthermore, the drive assembly includes a drive unit and a gear set. The drive unit includes an electric push rod, a motor, a winding reel, a fixed pulley, and a steel wire rope. The electric push rod is hinged to a fixed column, and the output rod end of the electric push rod is hinged to a swing arm near the fixed column. The motor is fixed to the base plate, and the winding reel is coaxial with and fixed to the output end of the motor. The fixed pulley is rotatably mounted on the upper end of the fixed column, one end of the steel wire rope is wound and fixed to the winding reel, and the other end of the steel wire rope passes over the fixed pulley and is fixed to the top of the guide rail. The gear set consists of two meshing transmission gears, which are provided in three sets and are coaxially arranged with the hinge points of the guide rail and the swing arm or linkage rod, the hinge point of the movable seat and the linkage rod, and the hinge point of the sliding seat and the linkage rod, respectively, to control the synchronous movement of the swing arm and the linkage rod, the linkage rod and the linkage rod, and the linkage rod and the traction rod. A T-shaped groove is provided at the bottom of the guide rail, and rollers that roll in cooperation with the T-shaped groove are rotatably mounted on both sides of the top of the sliding seat.

[0022] By adopting the above technical solution, when using the drive assembly to control the lifting of the guide rail, the operator only needs to simultaneously start the electric push rod and the motor. The electric push rod can control the swing arm to swing around its hinge point toward the side closer to the fixed column. At the same time, the motor controls the wire rope to wind up, so that the guide rail can be lifted smoothly (and the guide rail moves toward the side closer to the fixed column). Under the transmission action of the three sets of gears, the upper truss and lower truss held by the two sets of clamping units move synchronously toward the side closer to the fixed column until the upper / lower truss to be spliced ​​(the upper / lower truss held by the clamping unit) and the corresponding upper / lower truss of the base plate (the position is relatively fixed) are spliced. Then the operator can carry out the welding work.

[0023] Furthermore, the base plate abuts against the top of the upper truss. The clamping mechanism includes a fixing component and a clamping component. The fixing component includes a fixing block and a bidirectional screw. The fixing block is fixed to the top of the base plate, and the bidirectional screw passes through the fixing block and is rotatably connected to it. The bidirectional screw has two sections of threads with equal pitch and opposite directions. The clamping component has two sets arranged symmetrically, each including a movable frame, a mounting plate, a fixing rod, and a rubber sleeve. The bottom of the movable frame abuts against the top of the base plate, and the bidirectional screw passes through the movable frame and is threadedly connected to it. The mounting plate is located on one side of the base plate and is fixed to the end of the movable frame away from the middle of the bidirectional screw. The fixing rod is fixed to the mounting plate, and the rubber sleeve is fixedly fitted onto the fixing rod. The top of the rubber sleeve is flush with the bottom of the upper truss.

[0024] By adopting the above technical solution, the staff can control the two movable frames to move closer to each other by rotating the bidirectional screw, so that the fixed rods and rubber sleeves on both sides move closer to each other until the rubber sleeves on both sides abut against the bottom of the base plate, and then the installation plate can be fixed on the relatively fixed steel truss.

[0025] In summary, the present invention has the following beneficial effects: 1. In this application, steel powder serves as the core substrate, providing basic load-bearing capacity and structural stability. Boron-rare earth composite additives refine the steel matrix grains to enhance strength and weldability. Sodium-based bentonite grafted onto EPDM rubber enables microcrack self-repair and improves organic-inorganic interface compatibility. Graphene-montmorillonite composite modified self-adhesive asphalt constructs a synergistic anti-corrosion and waterproof system and enhances mechanical strength. Short-cut carbon fibers inhibit crack propagation to improve tensile strength and fatigue resistance. Silane coupling agents strengthen the interfacial bonding between the organic and inorganic phases. Zinc phosphate forms a chemical passivation film to inhibit electrochemical corrosion. Nano-silica fills pores to improve material density and wear resistance. Antioxidants delay the thermo-oxidative aging of organic components to extend service life. Zinc stearate optimizes processing fluidity to ensure molding uniformity. Borax and nano-titanium dioxide further assist in improving material stability and comprehensive performance. Under the synergistic effect of each component, the steel truss possesses excellent mechanical properties, anti-corrosion and waterproof performance, self-repair capability, processability, and service durability. 2. In this application, the distance between the L-shaped movable plates in the two clamping units can be adjusted by the adjustment unit. The L-shaped clamping plate and the L-shaped movable plate can clamp the upper and lower trusses to be connected (in order to enhance the fixing effect of the clamping unit on the upper or lower truss, fastening bolts for abutting the upper or lower truss can be set on the L-shaped movable plate). After the upper and lower trusses are fixed, the operator only needs to lift the guide rail by the drive component, which will change the angle between the swing arm and the guide rail. Since the movable seat is flush with the connecting frame, the swing rod and the linkage rod on the side away from the fixed column are parallel to each other, and the sliding seat slides with the guide rail, the sliding seat moves along the guide rail toward the side closer to the fixed column, thereby causing the upper and lower trusses clamped by the clamping unit to move toward the side closer to the fixed column. When the upper truss abuts the upper truss corresponding to the bottom plate (the position of this upper truss is relatively fixed), the operator can perform the welding operation of the two upper trusses or the two lower trusses, which speeds up the operator's progress in connecting the steel trusses. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the steel truss structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the connection structure between the steel truss docking auxiliary equipment and the steel truss in an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the structure of the connecting component in an embodiment of the present invention; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 yes Figure 3 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram of the steel truss docking auxiliary equipment in an embodiment of the present invention; Figure 7 yes Figure 6 A structural diagram from another perspective.

[0027] In the picture: 1. Upper truss; 2. Lower truss; 3. Stiffeners; 4. Base plate; 5. Clamping mechanism; 51. Fixing component; 511. Fixing block; 512. Bidirectional screw; 52. Clamping assembly; 521. Movable frame; 522. Mounting plate; 523. Fixing rod; 524. Rubber sleeve; 6. Docking mechanism; 61. Mounting components; 611. Fixing column; 612. Connecting frame; 613. Swing arm; 614. Guide rail; 6141. T-shaped slide rail; 62. Connecting assembly; 621. Linkage unit; 6211. Sliding seat; 62111. Roller; 6212. Movable seat; 6213. Linkage rod; 6214. Traction rod; 622. Clamping unit; 6221. L-shaped movable plate; 6222. L-shaped clamping plate; 6223. Fixing plate; 6224. Connecting plate; 623. Adjustment unit; 6231. Upper U-shaped frame; 6232. Lower U-shaped frame; 6233. Guide rod; 6234. Adjustment bolt; 63. Drive assembly; 631. Drive unit; 6311. Electric actuator; 6312. Motor; 6313. Winding reel; 6314. Fixed pulley; 6315. Wire rope; 632. Gear set; 6321. Transmission gear. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] like Figure 1-7 As shown, this application discloses a steel truss, including an upper truss 1, a lower truss 2, and a reinforcing rib 3 for connecting the upper truss 1 and the lower truss 2. The upper truss 1, the lower truss 2, and the reinforcing rib 3 are all made of composite materials. By weight, the raw materials of the composite material include: 65-80 parts of steel powder, 0.002-0.008 parts of boron-rare earth composite additive, 4-9 parts of sodium-based bentonite-grafted EPDM rubber, 3-7 parts of graphene-montmorillonite composite modified self-adhesive asphalt, 3-6 parts of chopped carbon fiber, 0.6-1.8 parts of silane coupling agent, 1.5-4.5 parts of zinc phosphate, 1.5-4.5 parts of nano-silica, 0.3-0.9 parts of antioxidant, 0.4-1.2 parts of zinc stearate, 0.8-1.5 parts of borax, and 0.5-1.2 parts of nano-titanium dioxide.

[0030] The steel powder is Q355B type steel powder, and the boron-rare earth composite additive is composed of boron and rare earth (Ce / La) in a mass ratio of 1:1; the length of the short-cut carbon fiber is 4-12mm and the diameter is 6-11μm; the silane coupling agent is one of KH-550, KH-560 or KH-570, and the antioxidant is one of antioxidant 1076, antioxidant 1010 or antioxidant 168; the particle size of nano silica is 15-45nm, the particle size of borax is 50-100μm, and the particle size of nano titanium dioxide is 10-30nm.

[0031] The raw materials for sodium bentonite-grafted EPDM rubber, by weight, include: 90-100 parts sodium bentonite, 60-80 parts EPDM rubber, 8-12 parts maleic anhydride, 1.0-1.8 parts benzoyl peroxide, 3-6 parts silane coupling agent KH-570, 1.5-3.0 parts sulfur, 0.3-0.8 parts accelerator (tetramethylthiuram disulfide), and 1.0-2.0 parts stearic acid; The preparation method of sodium-based bentonite grafted EPDM rubber includes the following steps: 1) Dry sodium-based bentonite at 110-125℃ for 3-5 hours, add 8wt% sodium chloride solution and stir for 2.5-3.5 hours, filter and wash with deionized water until no chloride ions are present, vacuum dry at 100-110℃ for 4-6 hours, then add it together with silane coupling agent KH-570 into a high-speed mixer and mix at 80-90℃ and a speed of 600-700 r / min for 15-20 minutes to obtain modified bentonite; 2) Put EPDM rubber into a two-roll mill and plasticize it at 110-130℃ for 8-12 minutes. Add maleic anhydride and benzoyl peroxide and mix it at 125-140℃ at a speed of 40-60 r / min for 25-35 minutes. 3) Cool the material obtained in 2) to 115-125℃, add sulfur, accelerator and stearic acid first, mix for 5-8 minutes, then add the modified bentonite obtained in 1), mix at 135-150℃ and 50-70 r / min for 30-40 minutes to obtain the mixture. 4) Transfer the mixture into a flat vulcanizing machine and vulcanize it for 18-22 minutes at 170-190℃ and 6-9MPa. After the vulcanized product is cooled to room temperature, it is crushed with a high-speed pulverizer and passed through a 230-250 mesh sieve to obtain sodium-based bentonite-grafted EPDM rubber.

[0032] By weight, the raw materials of graphene-montmorillonite composite modified self-adhesive asphalt include: 90-100 parts of 70# self-adhesive rubber asphalt, 2-5 parts of graphene, 4-8 parts of organomontmorillonite, 0.08-0.15 parts of sulfur, and 2-4 parts of dibutyl phthalate. The preparation method of graphene-montmorillonite composite modified self-adhesive asphalt includes the following steps: 1) Melt the rubber asphalt at 155-165℃ for 40-50 minutes, filter to remove mechanical impurities, then add graphene and dibutyl phthalate, heat to 160-170℃, and shear and stir at a high speed of 800-1000r / min, while simultaneously turning on 400-600W intermittent ultrasonic (working for 30s-60s, pausing for 10-20s) for 30-40 minutes; 2) Add organomontmorillonite to the material obtained in 1), heat to 175-185℃, increase the shear rate to 1200-1600r / min, and maintain intermittent ultrasonication at 400-600W for 50-70min. 3) Cool the material obtained in 2) to 165-175℃, add sulfur, and stir at a speed of 250-350r / min for 25-35min to obtain graphene-montmorillonite composite modified self-adhesive asphalt.

[0033] The preparation method of composite materials includes the following steps: S1. Raw material pretreatment: a. Dry Q355B steel powder at 110-125℃ for 3-5 hours, controlling the moisture content to ≤0.25%; b. Dry the chopped carbon fibers at 85-105℃ for 1.5-2.5 hours; c. Dry the boron-rare earth composite additive at 120-130℃ for 1-2 hours; d. After mixing borax with nano titanium dioxide, dry at 80-100℃ for 1-2 hours; S2, Component Mixing: a. Add the pretreated Q355B steel powder, boron-rare earth composite additive, and short-cut carbon fiber to a high-speed mixer and mix at 700-900 r / min at 90-110℃ for 20-30 min. b. Add sodium-based bentonite-grafted EPDM rubber, graphene-montmorillonite composite modified self-adhesive asphalt, zinc phosphate, nano silica, borax and nano titanium dioxide to the mixture obtained in step a. Mix at 85-105℃ and 600-800 r / min for 25-35 min. Then add silane coupling agent, antioxidant and zinc stearate. Mix at 65-85℃ and 350-550 r / min for 12-18 min to obtain the mixture. S3, Product Forming: a. Preheat the molds for upper truss 1, lower truss 2 and reinforcing rib 3 to 145-165℃ respectively, and coat the inner walls with release agent; b. Load the mixture obtained in step b of S2 into three molding molds, press them to 25-35MPa using a molding press, hold the pressure for 20-30min, and obtain the preformed blank; c. Transfer the preformed blank along with the mold into an argon-protected sintering furnace, heat it to 650-750℃ at a rate of 5-8℃ / min, hold it for 120-180min, then adjust the temperature to 600-700℃, apply 15-25MPa axial secondary pressure to the mold, hold the pressure for 60-90min, then cool it down to 300℃ at a rate of 3-5℃ / min, and finally allow it to cool naturally to room temperature and demold to obtain the blanks of the upper truss 1, lower truss 2 and reinforcing rib 3; d. Assemble the upper truss 1, lower truss 2 and stiffener 3 blanks into a steel truss and weld them at the connection points. Remove the burrs from the surface of the blanks. Then, evenly coat the surface of the steel truss with a 60-90μm thick epoxy zinc-rich primer and cure it at 150-170℃ for 2-3 hours. Next, coat it with a 0.2-0.4mm thick graphene-montmorillonite composite modified self-adhesive asphalt layer and cure it at room temperature for 24-36 hours to obtain the finished steel truss.

[0034] This application also discloses a docking auxiliary device for steel trusses, used for docking the aforementioned steel trusses. It includes a base plate 4, a clamping mechanism 5, and a docking mechanism 6. The clamping mechanism 5 is used to fix the base plate 4 to the upper truss 1 of two sets of parallel steel trusses. The docking mechanism 6 includes an installation component 61, a connecting component 62, and a driving component 63. The installation component 61 includes a fixed column 611, a connecting frame 612, a swing arm 613, and a guide rail 614. The fixed column 611 is fixed to the top of the base plate 4, and the connecting frame 612 is fixed to one side of the base plate 4. The swing arm 613... One end of arm 613 is hinged to connecting frame 612, and the other end is hinged to the bottom of guide rail 614 near fixed column 611. Guide rail 614 is horizontally set. There are two swing arms 613 that are parallel to each other. Connecting component 62 is movably set on guide rail 614 and is used to connect the upper truss 1 and lower truss 2 to be docked. Driving component 63 is used to lift guide rail 614 and drive the upper truss 1 to be docked to complete docking with the upper truss 1 at the bottom of base plate 4, and at the same time, the lower truss 2 to be docked to complete docking with the lower truss 2 below base plate 4.

[0035] The clamping mechanism 5 securely fixes the base plate 4 to the upper truss 1 of the two sets of parallel steel trusses, providing a reliable reference support for the docking of the steel trusses. The two parallel swing arms 613 are hinged to the frame 612 and the guide rail 614, ensuring that the guide rail 614 remains horizontal during the lifting process and preventing tilting or displacement of the steel trusses to be docked. The connecting component 62, which is movably set on the guide rail 614, can flexibly adapt to the connection requirements of the upper truss 1 and the lower truss 2 to be docked. With the lifting action of the drive component 63 on the guide rail 614, it can synchronously drive the upper truss 1 to be docked to the upper truss 1 at the bottom of the base plate 4 and the lower truss 2 to be docked to the lower truss 2 below the base plate 4 for precise docking. Through the coordinated cooperation of the mechanical structure, the stability and docking accuracy of the steel truss docking process are effectively guaranteed, and the synchronous and precise docking of the upper and lower trusses 2 is achieved.

[0036] The connecting assembly 62 includes a linkage unit 621, a clamping unit 622, and an adjusting unit 623. The linkage unit 621 includes a sliding seat 6211, a movable seat 6212, a linkage rod 6213, and a traction rod 6214. The sliding seat 6211 is slidably engaged with the guide rail 614, and the movable seat 6212 is located below the guide rail 614 and flush with the connecting frame 612. There are two pairs of linkage rods 6213, with two rods in each pair that are parallel to each other. The two pairs of linkage rods 6213 are symmetrically distributed about the movable seat 6212 and are hinged to it. In one pair, both linkage rods 6213 are hinged to the bottom of the guide rail 614 near the swing arm 613, and in the other pair, both linkage rods 6213 are hinged to the sliding seat 6211. The swing rod is parallel to the linkage rod 6213 on the side away from the fixed column 611. The traction rod 6214... One end of 4 is hinged to the sliding seat 6211. Two traction rods 6214 are provided and are parallel to each other. Clamping units 622 are arranged in groups and connected to the upper truss 1 and the lower truss 2 respectively. They include an L-shaped movable plate 6221, an L-shaped clamping plate 6222, a fixed plate 6223 and a connecting plate 6224. The inner side of the L-shaped movable plate 6221 and the inner side of the L-shaped clamping plate 6222 are adapted to the outer side of the upper truss 1 or the lower truss 2. The L-shaped movable plate 6221 is hinged to the two pairs of linkage rods 6213. The L-shaped clamping plate 6222 is hinged to the L-shaped movable plate 6221. The fixed plate 6223 is fixed on the L-shaped movable plate 6221. The connecting plate 6224 is fixed on the L-shaped clamping plate 6222, and the connecting plate 6224 and the fixed plate 6223 are detachably connected. The adjusting unit 623 is used to adjust the distance between the L-shaped movable plates 6221 in the two sets of clamping units 622.

[0037] The distance between the L-shaped movable plates 6221 in the two sets of clamping units 622 can be adjusted by adjusting unit 623. The L-shaped clamping plates 6222 and L-shaped movable plates 6221 cooperate to clamp the upper truss 1 and lower truss 2 to be connected (to enhance the fixing effect of clamping unit 622 on upper truss 1 or lower truss 2, fastening bolts for abutting upper truss 1 or lower truss 2 can be provided on L-shaped movable plates 6221); after upper truss 1 and lower truss 2 are fixed, the operator only needs to lift guide rail 614 by driving component 63 to change the angle between swing arm 613 and guide rail 614, due to the movable seat 6 212 is flush with the connecting frame 612, the swing rod is parallel to the linkage rod 6213 on the side away from the fixed column 611, and the sliding seat 6211 is slidably engaged with the guide rail 614, so that the sliding seat 6211 moves along the guide rail 614 toward the side closer to the fixed column 611, thereby causing the upper truss 1 and lower truss 2 held by the clamping unit 622 to move toward the side closer to the fixed column 611. When the upper truss 1 and the corresponding upper truss 1 of the base plate 4 (the position of this upper truss 1 is relatively fixed) abut, the workers can then perform the welding of the two upper trusses 1 or the two lower trusses 2, which speeds up the workers' progress in connecting the steel trusses.

[0038] The adjustment unit 623 includes an upper U-shaped frame 6231, a lower U-shaped frame 6232, a guide rod 6233, and an adjustment bolt 6234. The upper U-shaped frame 6231 is fixed to the upper L-shaped movable plate 6221, and the lower U-shaped frame 6232 is fixed to the lower L-shaped movable plate 6221. The guide rod 6233 is fixed to the lower U-shaped frame 6232, passes through the upper U-shaped frame 6231, and is slidably engaged with it. The adjustment bolt 6234 is rotatably connected to the lower U-shaped frame 6232, passes through the upper U-shaped frame 6231, and is threadedly connected with it.

[0039] After the operator tightens the adjusting bolt 6234, the upper U-shaped frame 6231 can be controlled to move towards or away from the lower U-shaped frame 6232, so that the two L-shaped movable plates 6221 move closer or further away from each other. This facilitates the upper truss 1 and the lower truss 2, which are fixed by the two sets of clamping units 622, to move closer or further away from each other, so that this equipment can be used for steel trusses of different specifications.

[0040] Drive assembly 63 includes drive unit 631 and gear set 632. Drive unit 631 includes electric push rod 6311, motor 6312, winding reel 6313, fixed pulley 6314, and wire rope 6315. Electric push rod 6311 is hinged to fixed post 611, and the output rod end of electric push rod 6311 is hinged to swing arm 613 near the fixed post 611. Motor 6312 is fixed to base plate 4, and winding reel 6313 is coaxial with and fixed to the output end of motor 6312. Fixed pulley 6314 is rotatably mounted on the upper end of fixed post 611. One end of wire rope 6315 is wound and fixed to winding reel 6313, and the other end of wire rope 6315 passes over fixed pulley 6314 and... The guide rail 614 is fixed to the top; the gear set 632 is composed of two meshing transmission gears 6321, and it has three sets of gears, which are respectively coaxially arranged with the hinge point of the guide rail 614 and the swing arm 613 or the linkage rod 6213, the hinge point of the movable seat 6212 and the linkage rod 6213, and the hinge point of the sliding seat 6211 and the linkage rod 6213, so as to control the synchronous movement of the swing arm 613 and the linkage rod 6213, the linkage rod 6213 and the linkage rod 6213, and the linkage rod 6213 and the traction rod 6214; the bottom of the guide rail 614 is provided with a T-shaped slide groove 6141, and the top two sides of the sliding seat 6211 are rotatably mounted with rollers 62111 that roll with the T-shaped slide groove 6141.

[0041] When using the drive assembly 63 to control the lifting of the guide rail 614, the operator only needs to simultaneously start the electric push rod 6311 and the motor 6312. The electric push rod 6311 can control the swing arm 613 to swing around its hinge point toward the side closer to the fixed column 611. At the same time, the motor 6312 controls the wire rope 6315 to wind up, so that the guide rail 614 can be lifted smoothly (and the guide rail 614 moves toward the side closer to the fixed column 611). Under the transmission action of the three sets of gear sets 632, the upper truss 1 and lower truss 2 held by the two sets of clamping units 622 move synchronously toward the side closer to the fixed column 611 until the upper truss 1 / lower truss 2 to be spliced ​​(the upper truss 1 / lower truss 2 held by the clamping unit 622) and the upper truss 1 / lower truss 2 corresponding to the base plate 4 (the positions are relatively fixed) are spliced. Then the operator can carry out the welding work.

[0042] The base plate 4 abuts against the top of the upper truss 1. The clamping mechanism 5 includes a fixing component 51 and a clamping component 52. The fixing component 51 includes a fixing block 511 and a bidirectional screw 512. The fixing block 511 is fixed to the top of the base plate 4. The bidirectional screw 512 passes through the fixing block 511 and is rotatably connected to it. The bidirectional screw 512 has two threads with equal pitch and opposite directions. The clamping component 52 has two sets arranged symmetrically. It includes a movable frame 521, a mounting plate 522, a fixing rod 523, and a rubber sleeve 524. The bottom of the movable frame 521 abuts against the top of the base plate 4. The bidirectional screw 512 passes through the movable frame 521 and is threadedly connected to it. The mounting plate 522 is located on one side of the base plate 4 and is fixed to the end of the movable frame 521 away from the middle of the bidirectional screw 512. The fixing rod 523 is fixed to the mounting plate 522. The rubber sleeve 524 is fixedly sleeved on the fixing rod 523. The top of the rubber sleeve 524 is flush with the bottom of the upper truss 1.

[0043] By rotating the bidirectional screw 512, the operator can control the two movable frames 521 to move closer together, thereby bringing the fixed rods 523 and rubber sleeves 524 on both sides closer together until the rubber sleeves 524 on both sides abut against the bottom of the base plate 4. This completes the process of fixing the mounting plate 522 to the relatively fixed steel truss. In this embodiment, a clamping unit 622 is also installed on the connecting frame 612 to enhance the connection stability between the base plate 4 and the steel truss, ensuring the smooth operation of the steel truss docking.

[0044] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A steel truss, characterized in that, It includes an upper truss (1), a lower truss (2) and a reinforcing rib (3) for connecting the upper truss (1) and the lower truss (2). The upper truss (1), the lower truss (2) and the reinforcing rib (3) are all made of composite materials. By weight, the raw materials of the composite material include: 65-80 parts steel powder, 0.002-0.008 parts boron-rare earth composite additive, 4-9 parts sodium-based bentonite-grafted EPDM rubber, 3-7 parts graphene-montmorillonite composite modified self-adhesive asphalt, 3-6 parts chopped carbon fiber, 0.6-1.8 parts silane coupling agent, 1.5-4.5 parts zinc phosphate, 1.5-4.5 parts nano silica, 0.3-0.9 parts antioxidant, 0.4-1.2 parts zinc stearate, 0.8-1.5 parts borax, and 0.5-1.2 parts nano titanium dioxide.

2. A steel truss according to claim 1, characterized in that: The steel powder is Q355B type steel powder, and the boron-rare earth composite additive is composed of boron and rare earth in a mass ratio of 1:1; the length of the short-cut carbon fiber is 4-12mm and the diameter is 6-11μm; the silane coupling agent is one of KH-550, KH-560 or KH-570, and the antioxidant is one of antioxidant 1076, antioxidant 1010 or antioxidant 168; the particle size of nano silica is 15-45nm, the particle size of borax is 50-100μm, and the particle size of nano titanium dioxide is 10-30nm.

3. A steel truss according to claim 1, characterized in that: The raw materials for sodium-based bentonite-grafted EPDM rubber, by weight, include: 90-100 parts sodium-based bentonite, 60-80 parts EPDM rubber, 8-12 parts maleic anhydride, 1.0-1.8 parts benzoyl peroxide, 3-6 parts silane coupling agent KH-570, 1.5-3.0 parts sulfur, 0.3-0.8 parts accelerator, and 1.0-2.0 parts stearic acid; The preparation method of sodium-based bentonite grafted EPDM rubber includes the following steps: 1) Dry sodium-based bentonite at 110-125℃ for 3-5 hours, add 8wt% sodium chloride solution and stir for 2.5-3.5 hours, filter and wash with deionized water until no chloride ions are present, vacuum dry at 100-110℃ for 4-6 hours, then add it together with silane coupling agent KH-570 into a high-speed mixer and mix at 80-90℃ and a speed of 600-700 r / min for 15-20 minutes to obtain modified bentonite; 2) Put EPDM rubber into a two-roll mill and plasticize it at 110-130℃ for 8-12 minutes. Add maleic anhydride and benzoyl peroxide and mix it at 125-140℃ at a speed of 40-60 r / min for 25-35 minutes. 3) Cool the material obtained in 2) to 115-125℃, add sulfur, accelerator and stearic acid first, mix for 5-8 minutes, then add the modified bentonite obtained in 1), mix at 135-150℃ and 50-70 r / min for 30-40 minutes to obtain the mixture. 4) Transfer the mixture into a flat vulcanizing machine and vulcanize it for 18-22 minutes at 170-190℃ and 6-9MPa. After the vulcanized product is cooled to room temperature, it is crushed with a high-speed pulverizer and passed through a 230-250 mesh sieve to obtain sodium-based bentonite-grafted EPDM rubber.

4. A steel truss according to claim 1, characterized in that: By weight, the raw materials of graphene-montmorillonite composite modified self-adhesive asphalt include: 90-100 parts of rubber asphalt, 2-5 parts of graphene, 4-8 parts of organomontmorillonite, 0.08-0.15 parts of sulfur, and 2-4 parts of dibutyl phthalate. The preparation method of graphene-montmorillonite composite modified self-adhesive asphalt includes the following steps: 1) Melt the rubber asphalt at 155-165℃ for 40-50 minutes, filter to remove mechanical impurities, then add graphene and dibutyl phthalate, heat to 160-170℃, and shear and stir at a high speed of 800-1000r / min, while simultaneously turning on 400-600W intermittent ultrasonication for 30-40 minutes; 2) Add organomontmorillonite to the material obtained in 1), heat to 175-185℃, increase the shear rate to 1200-1600r / min, and maintain intermittent ultrasonication at 400-600W for 50-70min. 3) Cool the material obtained in 2) to 165-175℃, add sulfur, and stir at a speed of 250-350r / min for 25-35min to obtain graphene-montmorillonite composite modified self-adhesive asphalt.

5. A steel truss according to claim 1, characterized in that, The preparation method of composite materials includes the following steps: S1. Raw material pretreatment: a. Dry Q355B steel powder at 110-125℃ for 3-5 hours, controlling the moisture content to ≤0.25%; b. Dry the chopped carbon fibers at 85-105℃ for 1.5-2.5 hours; c. Dry the boron-rare earth composite additive at 120-130℃ for 1-2 hours; d. After mixing borax with nano titanium dioxide, dry at 80-100℃ for 1-2 hours; S2, Component Mixing: a. Add the pretreated Q355B steel powder, boron-rare earth composite additive, and short-cut carbon fiber to a high-speed mixer and mix at 700-900 r / min at 90-110℃ for 20-30 min. b. Add sodium-based bentonite-grafted EPDM rubber, graphene-montmorillonite composite modified self-adhesive asphalt, zinc phosphate, nano silica, borax and nano titanium dioxide to the mixture obtained in step a. Mix at 85-105℃ and 600-800 r / min for 25-35 min. Then add silane coupling agent, antioxidant and zinc stearate. Mix at 65-85℃ and 350-550 r / min for 12-18 min to obtain the mixture. S3, Product Forming: a. Preheat the molds for the upper truss (1), lower truss (2) and reinforcing rib (3) to 145-165℃ respectively, and coat the inner wall with a release agent; b. Load the mixture obtained in step b of S2 into three molding molds, press them to 25-35MPa using a molding press, hold the pressure for 20-30min, and obtain the preformed blank; c. Transfer the preformed blank along with the mold into an argon-protected sintering furnace, heat it to 650-750℃ at a rate of 5-8℃ / min, hold it for 120-180min, then adjust the temperature to 600-700℃, apply 15-25MPa axial secondary pressure to the mold, hold the pressure for 60-90min, then cool it down to 300℃ at a rate of 3-5℃ / min, and finally let it cool naturally to room temperature and demold to obtain the blanks of the upper truss (1), lower truss (2) and reinforcing rib (3); d. Assemble the upper truss (1), lower truss (2) and stiffener (3) blanks into a steel truss and weld them at the connection points. Remove the burrs from the surface of the blanks. Then, evenly coat the surface of the steel truss with a 60-90μm thick epoxy zinc-rich primer and cure it at 150-170℃ for 2-3 hours. Then coat it with a 0.2-0.4mm thick graphene-montmorillonite composite modified self-adhesive asphalt layer and cure it at room temperature for 24-36 hours to obtain the finished steel truss.

6. A docking auxiliary device for steel trusses, used for docking the steel truss according to any one of claims 1-5, characterized in that: It includes a base plate (4), a clamping mechanism (5) and a docking mechanism (6). The clamping mechanism (5) is used to fix the base plate (4) to the upper truss (1) of the two sets of parallel steel trusses. The docking mechanism (6) includes an installation component (61), a connection component (62), and a drive component (63). The installation component (61) includes a fixed column (611), a connecting frame (612), a swing arm (613), and a guide rail (614). The fixed column (611) is fixed to the top of the base plate (4), and the connecting frame (612) is fixed to one side of the base plate (4). One end of the swing arm (613) is hinged to the connecting frame (612), and the other end is hinged to the bottom of the guide rail (614) near the fixed column (611). The guide rail (614) is horizontally set, and there are two swing arms (613) that are parallel to each other. The connecting component (62) is movably mounted on the guide rail (614) and is used to connect the upper truss (1) and the lower truss (2) to be docked. The driving component (63) is used to lift the guide rail (614) and drive the upper truss (1) to be docked to complete the docking with the upper truss (1) at the bottom of the base plate (4), while at the same time enabling the lower truss (2) to be docked to complete the docking with the lower truss (2) below the base plate (4).

7. The docking auxiliary equipment for steel trusses according to claim 6, characterized in that: The connecting assembly (62) includes a linkage unit (621), a clamping unit (622), and an adjustment unit (623). The linkage unit (621) includes a sliding seat (6211), a movable seat (6212), a linkage rod (6213), and a traction rod (6214). The sliding seat (6211) is slidably engaged with the guide rail (614), and the movable seat (6212) is located below the guide rail (614) and flush with the connecting frame (612). There are two pairs of linkage rods (6213), each pair of linkage rods (6213) has two rods that are parallel to each other. The two pairs of linkage rods (6213) are symmetrically distributed about the movable seat (6212) and are hinged to the movable seat (6212). The two linkage rods (6213) of one pair are hinged to the bottom of the guide rail (614) near the position of the swing arm (613), and the two linkage rods (6213) of the other pair are hinged to the sliding seat (6211). One end of the traction rod (6214) is hinged to the sliding seat (6211), and there are two traction rods (6214) that are parallel to each other. Clamping units (622) are arranged in groups and connected to the upper truss (1) and lower truss (2) respectively. Each unit includes an L-shaped movable plate (6221), an L-shaped clamping plate (6222), a fixing plate (6223), and a connecting plate (6224). The inner sides of the L-shaped movable plate (6221) and the L-shaped clamping plate (6222) are adapted to the outer sides of the upper truss (1) or the lower truss (2). The L-shaped movable plate (6221) is connected to two pairs of linkage rods (6224). 13) All are hinged, the L-shaped clamping plate (6222) and the L-shaped movable plate (6221) are hinged; the fixed plate (6223) is fixed on the L-shaped movable plate (6221), the connecting plate (6224) is fixed on the L-shaped clamping plate (6222), and the connecting plate (6224) and the fixed plate (6223) are detachably connected; the adjusting unit (623) is used to adjust the distance between the L-shaped movable plates (6221) in the two sets of clamping units (622).

8. The docking auxiliary equipment for steel trusses according to claim 7, characterized in that: The adjustment unit (623) includes an upper U-shaped frame (6231), a lower U-shaped frame (6232), a guide rod (6233), and an adjustment bolt (6234). The upper U-shaped frame (6231) is fixed to the upper L-shaped movable plate (6221), and the lower U-shaped frame (6232) is fixed to the lower L-shaped movable plate (6221). The guide rod (6233) is fixed to the lower U-shaped frame (6232), passes through the upper U-shaped frame (6231), and slides with it. The adjustment bolt (6234) is rotatably connected to the lower U-shaped frame (6232), passes through the upper U-shaped frame (6231), and is threadedly connected with it.

9. The docking auxiliary equipment for steel trusses according to claim 7, characterized in that: The drive assembly (63) includes a drive unit (631) and a gear set (632). The drive unit (631) includes an electric actuator (6311), a motor (6312), a winding reel (6313), a fixed pulley (6314), and a wire rope (6315). The electric actuator (6311) is hinged to a fixed post (611). The output rod end of the electric actuator (6311) is connected to a swing arm near the fixed post (611). (613) Hinged; the motor (6312) is fixed on the base plate (4), the winding wheel (6313) is coaxial with and fixed to the output end of the motor (6312); the fixed pulley (6314) is rotatably mounted on the upper end of the fixed column (611), one end of the wire rope (6315) is wound and fixed to the winding wheel (6313), and the other end of the wire rope (6315) passes over the fixed pulley (6314) and is fixed to the top of the guide rail (614); The gear set (632) is composed of two meshing transmission gears (6321). It has three sets of gears that are coaxially arranged with the hinge points of the guide rail (614) and the swing arm (613) or the linkage rod (6213), the hinge point of the movable seat (6212) and the linkage rod (6213), and the hinge point of the sliding seat (6211) and the linkage rod (6213), respectively, so as to control the synchronous movement of the swing arm (613) and the linkage rod (6213), the linkage rod (6213) and the linkage rod (6213), and the linkage rod (6213) and the traction rod (6214).

10. The docking auxiliary equipment for a steel truss according to claim 6, characterized in that: The base plate (4) abuts against the top of the upper truss (1). The clamping mechanism (5) includes a fixing component (51) and a clamping component (52). The fixing component (51) includes a fixing block (511) and a double-ended screw (512). The fixing block (511) is fixed to the top of the base plate (4). The double-ended screw (512) passes through the fixing block (511) and is rotatably connected to it. The double-ended screw (512) is provided with two threads with equal pitch and opposite direction of rotation. The clamping assembly (52) is provided in two sets and symmetrically arranged, including a movable frame (521), a mounting plate (522), a fixing rod (523) and a rubber sleeve (524); the bottom of the movable frame (521) abuts against the top of the base plate (4), and the double-acting screw (512) passes through the movable frame (521) and is threadedly connected to it; the mounting plate (522) is located on one side of the base plate (4), and it is fixed to one end of the movable frame (521) away from the middle of the double-acting screw (512); the fixing rod (523) is fixed to the mounting plate (522), and the rubber sleeve (524) is fixedly sleeved on the fixing rod (523), and the top of the rubber sleeve (524) is flush with the bottom of the upper truss (1).

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