Portal frame

About: Portal frame is a research topic. Over the lifetime, 1778 publications have been published within this topic receiving 7210 citations.

Curtain board transport lifting device and method for mounting curtain board by using device

Abstract: The invention discloses a curtain board transport lifting device which comprises a portal frame, a slide bogie and an electric block, wherein the portal frame is a cubic frame composed of two front and two back steel pipe upright posts and peripheral cross beams; a balance weight basket is arranged between the two back steel pipe upright posts of the cubic frame; roller devices are mounted at the four corners of the cubic frame; a top girder is connected on the medial axis of the top of the cubic frame, and a segment of the front end of the top girder extends from the cubic frame to form a cantilever segment with the length smaller than the span of the cubic frame; the slide bogie is mounted on a lower flange of the top girder; the electric block is connected below the slide bogie. The invention also provides a method for mounting the curtain board by using the device. By adopting the scheme of the invention, the mounting efficiency of the curtain board can be improved, and the device is simple in structure, low in cost and labor-saving.

Efficient portal crane with hopper

Abstract: The invention discloses an efficient portal crane with a hopper. A portal frame is connected with a rotating disk assembly through a transmission bearing. An arm frame structure is fixed to the rotating disk assembly and comprises a large pulling rod, a trunk beam, a crane arm and a balance frame. The balance frame, the large pulling rod and the trunk beam are hinged in sequence. One end of the balance frame is hinged to a frame body of the trunk beam, and the other end of the balance frame is connected with the rotating disk assembly. A lifting mechanism is fixed to the rotating disk assembly and comprises a plurality of lifting machines. Each lifting machine is connected with a steel wire rope. After penetrating through the large pulling rod and the trunk beam, the steel wire ropes are connected with a lifting hook. The portal crane with the hopper further comprises a material receiving device. The material receiving device is located in a girder notch of the portal frame and comprises the hopper. The efficient portal crane with the hopper has the advantages that the lifting weight is large; the size is large; the operation time is short; materials are not prone to scattering; the hopper and a dock belt conveyor are not prone to being abraded; model selection of electromechanical parts and components is easy; flying dust is little; environmental protection is achieved; and operation is efficient.

Special welding robot of hoist

Abstract: The utility model discloses a special welding robot of hoist, including solder flux storage vat, flux recycling machine, aircraft nose sideslip mechanism, welding machine portal frame, electronic box, submerged arc welding machine, welding machine aircraft nose locating rack, welding machine aircraft nose, recovery hose, wheel device, in the both sides bottom of welding machine portal frame, submerged arc welding machine installs respectively on two landing legs of welding machine portal frame the wheel device respectively, aircraft nose sideslip mechanism is connected with the landing leg of controlling of welding machine portal frame respectively, constitutes portal frame structure, the flux recycling machine is respectively in welding machine portal frame both sides top, through the hose with the solder flux storage vat is connected, the solder flux storage vat is located sideslip mechanism top, is connected through pipeline and welding machine aircraft nose, the utility model discloses an automatic of welding process is retrieved, has improved welding efficiency

Lifting platform for switching handcart

Abstract: The utility model provides a lifting platform for a switching handcart, which comprises a portal frame body; two ends of a first support frame and two ends of a second support frame are inserted in inward chutes of the portal frame body, and can move up and down along the chutes; a motor drive mechanism is fixed at the rear part of the portal frame body, and is used for driving a drive screw rod to move up and down; the drive screw rod extends in the vertical direction; one end of the drive screw rod passes through the motor drive mechanism; the other end of the drive screw rod is fixedly connected with a drawing mechanism; two sprocket wheels are arranged at the left end and the right end of the drawing mechanism respectively; ends of two chains are fixed on an upper beam of the portal frame body; the other ends of the two chains bypass the left and the right sprocket wheels of the drawing mechanism from the lower part of the upper beam in sequence, bypass two fixed sprocket wheels on the portal frame body in sequence from the upper part of the upper beam, extend downward and are fixed on the upper first support frame and the lower second support frame in sequence; a hoisting mechanism is arranged before the first support frame; and a supporting mechanism is arranged before the second support frame.

Detection of Anomaly in a Pretensioned Bolted Beam-to-Column Connection Node Using Digital Image Correlation and Neural Networks

Abstract: Bolted connections, commonly applied in civil engineering structures, have many advantages. According to current trends, bolted connections in steel structures are designed as prestressed ones. Unfortunately, precise control of the prestressing forces is difficult, while the loosening (due to, e.g., dynamic interactions) may be dangerous for the entire structure. There are many control methods applied in the determination of the tightening level, among which are vision-based methods. The methods described so far enable—thanks to image processing—damage detection in connections with visible connectors. The level of the considered loosening was significant—in many cases, changes in connectors were visible with the naked eye, whereas the procedure presented here enables the detection of very small changes, impossible to detect without manual inspection of every single connector. It is not necessary to observe the connectors directly, but the near surrounding of the node should be visible. As a measurement technique, Digital Image Correlation (DIC) was used. The applied measurement method and the high sensitivity of the presented procedure makes the presented research original. The currently presented procedure, employing Artificial Neural Networks, based on the laboratory examination of an example of one selected beam-to-column connection of a two-story steel portal frame, was perfect in the detection of a change and in the determination of the number of loosened rows, 95%, and their location, 94%, with the number of false alarms below 1%.