Showing papers on "Portal frame published in 2019"

Novel pin jointed moment connection for cold-formed steel trusses

Abstract: Portal frame structures, made up of cold-formed steel trusses, are increasingly being used for lightweight building construction. A novel pin-jointed moment connector, called the Howick Rivet Connector (HRC), was developed and tested previously in T-joints and truss assemblage to determine its reliable strength, stiffness and moment resisting capacity. This paper presents an experimental study on the HRC, in moment resisting cold-formed steel trusses. The connection method is devised where intersecting truss members are confined by a gusset connected by HRCs to create a rigid moment connection. In total, three large scale experiments were conducted to determine the elastic capacity and cyclic behaviour of the gusseted truss moment connection comprising HRC connectors. Theoretical failure loads were also calculated and compared against the experimental failure loads. Results show that the HRCs work effectively at carrying high shear loads between the members of the truss, enabling rigid behaviour to be developed and giving elastic behaviour without tilting up to a defined yield point. An extended gusset connection has been proposed to maximize the moment carrying capacity in a truss knee connection using the HRCs, in which they are aligned around the perimeter of the gusset to maximize the moment capacity and to increase the stability of the truss knee joint.

Non-deterministic Approach for Reliability Evaluation of Steel Portal Frame

Abstract: In recent years, more researches on structural reliability theory and methods have been carried out. In this study, a portal steel frame is considered. The reliability analysis for the frame is represented by the probability of failure, P_f, and the reliability index, β, that can be predicted based on the failure of the girders and columns. The probability of failure can be estimated dependent on the probability density function of two random variables, namely Capacity R, and Demand Q. The Monte Carlo simulation approach has been employed to consider the uncertainty the parameters of R, and Q. Matlab functions have been adopted to generate pseudo-random number for considered parameters. Although the Monte Carlo method is active and is widely used in reliability research, it has a disadvantage which represented by the requirement of large sample sizes to estimate the small probabilities of failure. This is leading to computational cost and time. Therefore, an Approximated Monte Carlo simulation method has been adopted for this issue. In this study, four performances have been considered include the serviceability deflection limit state, ultimate limit state for girder, ultimate limit state for the columns, and elastic stability. As the portal frame is a statically indeterminate structure, therefore bending moments, and axial forces cannot be determined based on static alone. A finite element parametric model has been prepared using Abaqus to deal with this aspect. The statistical analysis for the results samples show that all response data have lognormal distribution except of elastic critical buckling load which has a normal distribution.

Shear Resistance of portal Frame Reinforced with Bamboo and Steel Rebar: Experimental and Numerical Evaluation

Abstract: The main objective of this study is to evaluate the shear resistance of portal frame fabricated with bamboo and steel rebar by following experimental and numerical approaches. In support of sustainable construction, bamboo stripes were utilized as a partial replacement of steel rebar at tension zone of members that are subjected to lateral loading. The performance of nominal portal frame, which are fabricated with steel reinforcement was compared to the portal frames having several replacements of steel reinforcement with bamboo, in terms of seismic resistance and lateral load capacity. The experimental data was correlated based on software analysis using ABAQUS. The partial replacement of steel with bamboo under tension zone of the beams in portal frame was found to be highly effective, and also that the flexural rigidity of the partial bamboo reinforced frame was slightly higher than the nominal portal frame. This study provides insight on the possibility of reinforcing structural members with bamboo, when lateral loading is imminent on the structure.

Damage identification of a reinforced concrete frame at increasing damage levels by sensitivity-based finite element model updating

Abstract: This paper presents the damage identification results of an experimentally tested half-scale reinforced concrete portal frame using the sensitivity-based finite element model updating method. Progressively increasing story drifts are imposed on the frame by a displacement-controlled hydraulic actuator using single-cycle quasi-static lateral loading along the frame’s in-plane direction. System identification is performed using an output-only system identification method at different damage levels. Dynamic tests used for system identification are conducted using an electro-dynamic shaker. The objective function used for damage identification is constructed by the difference between the experimentally identified and numerically predicted modal parameters. Damage identification is performed in two steps: (1) The initial numerical model is updated to obtain a reference model using the modal parameters corresponding to the undamaged frame and (2) the reference model is updated for increasing damage levels using the modal parameters corresponding to these levels to identify existence of damage, its location and extent. The condition of the optimization problem is improved by reducing the number of design parameters. Damage identification results are presented in terms of stiffness reduction factors assigned to the column(s) bottom and beam ends and they correlate very well with the visual damage inspections done during the quasi-static tests.

Double workbench spouts a yard device

Abstract: The utility model provides a double workbench spouts a yard device belongs to spraying equipment technical field, including frame, inkjet system, curing system and workstation, inkjet system includesfirst portal frame, first slide, spouts yard rifle and cylinder, and first portal frame stretches over in the top of frame, and the both sides of frame are equipped with one the 1st actuating mechanism respectively, and the crossbeam slidable of first slide and first portal frame is connected, spout yard rifle and be connected with first slide slidable, the cylinder set up on the slide and with spout a yard rifle and be connected, curing system includes second portal frame, second slide and solidification ware, and the second portal frame spanes in the top of frame, and the crossbeam slidableof second slide and second portal frame is connected, solidifies the ware and sets up on the second slide, the quantity of workstation is two, and two workstations set up side by side just to be connected with frame slidable in the top of frame, its simple structure, convenient to use, production efficiency is high.

Construction method for hoisting novel phase modifier based on portal frame and Laoxinge device

Abstract: The invention discloses a construction method for hoisting a novel phase modifier based on a portal frame and a Laoxinge device. Construction preparation and basic treatment are conducted; track beamsupports are arranged and reinforced; track beams are placed; the track beams are arranged in two columns on steel buttresses and fixed through bolts; a portal frame traveling mechanism is placed, anda portal frame is mounted; a hydraulic hoisting device is mounted and arranged; a hoisting device is perfected and debugged; a stator is unloaded and steered; the hydraulic hoisting device is arranged again; the stator is hoisted in position; and hoisting equipment is dismounted. The track beams are laid between a phase modifier base platform and a hoisted object, the Laoxinge device are matchedwith the portal frame to travel on the track beams, the effect that heavy objects are hoisted in position in factories without heavy hoisting equipment in a narrow space is achieved, vertical lifting,lowering, back-and-forth movement and rotation operation of the heavy objects can be completed, and the problems that in the prior art, assembled operation equipment is adopted for operation, the operation steps are cumbersome and complicated, the workload and labor intensity of personnel are increased, and the burden on enterprises is increased are solved.

Timber Portal Frames vs Timber Truss-Based Systems for Residential Buildings

Abstract: A large number of structures have been built during or after the construction of a house or residential-zoned building, which are not built at the same time and/or integrally with the structural integrity of the residential dwelling. These include carports, pergolas, sheds, and barns. The typical method of constructing these structures is a general timber truss and column system. The aim of this study is to look at the feasibility and economic incentive that may be gained from using a timber portal frame system, similar to the steel or timber portal frames used for larger industrial constructions, over the traditional timber truss and column arrangement. In this study, designs for three cases of timber truss and timber portals were carried out using industry appropriate methods and standards. Using the design information and data gathered through talks with industry professionals, both methods of construction were compared on cost and overall time duration. From the comparison of the truss and portal designs, the use of timber portal frames over timber truss systems proved to have advantage in relation to overall cost and man power involved. This could certainly affect the current attitude towards the construction of small residential buildings in the future.

Full -automatic precision locating pasting mascerating machine

Abstract: The utility model discloses a full -automatic precision locating pasting mascerating machine, including base, mount, mounting base, cross axle lead screw, remove frame and portal frame, base upper endbilateral symmetry is equipped with the portal frame, the portal frame upper end is equipped with the support frame, be equipped with cross axle lead screw and cross axle slide bar between the support frame. The utility model discloses structurally reasonable in design sets up width adjusting device, is favorable to carrying out width regulation according to the PCB board of variation in size, drives the lead screw through adjustable width motor and rotates, and lead screw lateral wall cover is equipped with the lead screw slider to driving and removing the frame removal, remove frame lower extreme bilateral symmetry and be provided with the slider, the slider can carry out effect spacing and that reduce sliding friction to removing to put up with slide rail sliding connection, set up transport mechanism, through the transmission of action wheel and follow driving wheel, drive PCB board moves the transportation, set up cross axle lead screw and cross axle slide bar, the abscissa axisdirection's of being convenient for carry on removal to the mobile station.

Material flow real-time detection device based on video images

Abstract: The invention discloses a material flow real-time detection device based on video images, including a linear light source emitter, a portal frame, a beam, high-frequency cameras, a conveyor belt, an image analysis software, a host computer, a speed measuring trolley, a carrier roller set and a middle frame. The portal frame is installed on the middle frame of a belt conveyor. The beam is welded tothe middle of the portal frame. The linear light source emitter is fixed to the middle position of the beam. The high-frequency cameras are respectively installed at the two ends of the beam. The speed measuring trolley is installed on the return section of the conveyor. A signal output cable is connected to the image analysis software. The image analysis software is connected to the host computer. The two cameras continuously and synchronously collect the video images of the contour of the illuminated position of the surface of the material and transmit the image data to the image analysis software and the host computer. The actual material surface contour data is calculated, and fitting and matching operation is carried out on the actual material surface contour data and the surface contour data of the belt under the condition of no load to determine the cross-section area of the material at the illuminated position. The instantaneous weight of the material is calculated by integrating time according to the material density and the belt speed. The material flow real-time detection device based on video images has a simple structure and high measurement accuracy, and adapt to weak light and other harsh working environments.

Assembly-type processing die table for ceramic tile wall surface and construction method thereof

Abstract: The invention discloses an assembly-type processing die table for a ceramic tile wall surface, and relates to the field of building engineering. The die table comprises a working platform with a complete surface, a frame is arranged on the working platform, and a plurality of clamping grooves are formed in the upper end face of the frame; a pair of sliding rails which are distributed on the two sides of the frame are arranged on the side wall of the working platform, sliding seats are arranged on the sliding rails, a portal frame is which cross the frame is arranged on the sliding seats, a scrapping plate is arranged at the lower end face of the portal frame, and the scrapping plate is arranged in the length direction of the portal frame and abuts against the upper end face of the frame. The die table has the advantages that the surface of the concrete is leveled and smoothed by arranging the scrapping plate, so that the two sides of the molded wall surface are in a flat state, a worker does not need to use cement to level the surface of the wall surface again, ceramic tiles can be directly bonded, the bonding process of the ceramic tiles is easier and more convenient, the labor intensity of the worker is reduced, and the construction period is shortened.

Lifting type carrying equipment

Abstract: The utility model discloses lifting type carrying equipment which comprises a portal frame, a set of bases extending forwards are fixed to the bottom of the portal frame, universal wheels are installed at the bottoms of the front ends of the bases, and portal frame driving wheel mechanisms are installed at the bottoms of the rear ends of the bases. The pallet fork assembly comprises a pallet forkmounting frame and a set of fork arms extending forwards, pallet fork wheel mechanisms are mounted at the bottoms of the front ends of the fork arms, and a set of stand columns are fixedly mounted onthe pallet fork mounting frame; a fork lifting mechanism; the lifting frame is vertically arranged at the rear end of the portal frame in a sliding mode, and a lifting frame driving wheel mechanism isinstalled at the bottom of the lifting frame; lifting frame driving mechanism. The equipment is arranged on the flat ground or a vehicle plate, has the same functions as a forklift, can achieve the functions of loading, unloading, advancing, retreating, climbing, turning, in-situ turning and the like, does not need manual participation in the loading and unloading process, and is convenient to operate and use, safe, reliable, rapid and accurate.

Straightening machine for edges of steel box girder

Abstract: The invention discloses a straightening machine for the edges of a steel box girder. The straightening machine is characterized in that the straightening machine comprises a worktable, a moving seat,a portal frame, a fixed abutting plate, a straightening plate and a second hydraulic cylinder, wherein the worktable is used for storing the steel box girder, the moving seat is arranged on the worktable, the portal frame is arranged on the moving seat, the fixed abutting plate is fixed to the portal frame, the straightening plate is slidably connected to the portal frame, and the second hydrauliccylinder is fixed to the portal frame; and the upper surface of the fixed abutting plate abuts against the bottom face of face plates of the steel box girder, and the bottom face of the straighteningplate abuts against the upper surfaces of the face plates of the steel box girder; and the end of a piston rod of the second hydraulic cylinder is vertically downward, and is fixed to the upper surface of the straightening plate. The straightening machine has the following advantages and effects that the straightening machine straightens the face plates at the edges of the steel box girder through a mechanical straightening method, the straightening effect is good, and the straightened face plates meet the using requirements.

Spray cleaning device for automobile

Abstract: The utility model provides a spray cleaning device for automobile belongs to vehicle washing equipment field. Its technical scheme does: including the base frame with set up the portal frame on the base frame, be provided with translation mechanism and spray assembly on the portal frame, still including setting up the wiper mechanism on the base frame of portal frame both sides, the portal frame includes the roof -rack, and the roof -rack supports on the base frame through a plurality of supporting legs, and the roof -rack includes preceding bracing piece, back bracing piece, left branch vaulting pole and right branch vaulting pole, the wiper mechanism includes elevating platform and round brush subassembly, the elevating platform includes base, footstock, cuts formula crane and linkage unit, is provided with the spill slide on the footstock, the fixed round brush subassembly that is provided with in footstock side and slide side, and the round brush subassembly is including fixed disc, disc brush and planetary gear set spare. The beneficial effects of the utility model are that: can make things convenient for, swift washing automobile body to further wash automobile body both sides and wheel hub, improved washing work efficiency, guaranteed the cleanness of automobile body.

Rigid rectangular pipe gantry convenient to install

Abstract: The utility model relates to the technical field of portal frames The utility model discloses a rigid rectangular pipe gantry convenient to install The device comprises a cross beam and two first rectangular pipes, second rectangular pipes are movably arranged in the two first rectangular pipes; the lower end in the first rectangular pipe is fixedly connected with a fixed block; a lifting screwrod which is vertically arranged is further arranged in the first rectangular pipe; the lower end of the rod wall of the lifting screw rod is fixedly connected with the fixed block through a first rolling bearing; the upper end of the lifting lead screw extends into the second rectangular pipe, the lower end of the interior of the second rectangular pipe is fixedly connected with a lifting nut, the lifting nut is in threaded connection with the lifting lead screw, the lower ends of the two opposite sides of the two first rectangular pipes are fixedly connected with lifting motors, and the output ends of the lifting motors are rotationally connected with first rotating shafts through first couplers The portal frame can be installed conveniently, the height of the cross beam of the portal frame can be adjusted conveniently, the portal frame can be moved conveniently, and people can use the portal frame conveniently

Automatic production line of flange

Abstract: The invention discloses an automatic production line of a flange. The automatic production line comprises a first portal frame and a second portal frame which are arranged along a straight line, wherein a first lathe, a second lathe and a third lathe are sequentially arranged below the first portal frame, a first mechanical arm and a second mechanical arm are sequentially arranged on the first portal frame, a first machining center, a second machining center and a third machining center are sequentially arranged on the second portal frame, and a third mechanical arm and a fourth mechanical armare sequentially arranged on the second gantry frame; a blank feeding device is arranged between the first lathe and the second lathe, a turnover device is arranged between the second lathe and the third lathe, a transferring device is arranged between the first portal frame and the second portal frame, a common material table is arranged between the second machining center and the third machining center, and a blanking device is arranged at the tail end of the second portal frame. According to the technical scheme, the automatic production line is characterized in that a blank is sequentially subjected to turning vehicle end surface, boring, turning vehicle end surface, milling, drilling and cutting, the process is complete and self-moving, and the production efficiency is high.

Coiling device of paper machine

Abstract: The utility model belongs to the technical field of paper winding equipment, and particularly relates to a paper machine winding device which comprises a machine frame and a paper winding mechanism, the paper winding mechanism is installed on the machine frame, the machine frame is a portal frame, the portal frame comprises a top frame, two stand columns are arranged at the two ends of the top frame, and the lower ends of the stand columns are fixedly connected to a bottom frame. The paper winding mechanism comprises two parallel triangular frames, roller seats are arranged at the corners of the triangular frames, three paper winding rollers are installed in the roller seats at the three vertex angles of the triangular frames respectively, and one end of each paper winding roller is connected with a servo motor installed on the corresponding triangular frame. A conversion shaft is arranged in the center of the triangular frame, the two ends of the conversion shaft are connected to stand columns of the portal frame, and one end of the conversion shaft is connected with a roller changing motor installed on the bottom frame through a gear set. A paper breaking mechanism is fixedly mounted below a top frame of the portal frame; and a glue spraying mechanism is arranged on the underframe beside the stand column. According to the technical scheme, the multiple paper winding rollers are installed at the three vertex angles of the two sets of parallel triangular frames, a new paper winding mechanism is designed, and the speed of replacing the paper winding rollers in the paper winding production process is greatly increased.

Efficient double-gantry dispensing machine

Abstract: The utility model discloses an efficient double-gantry dispensing machine. Bottom plate, a first Y-axis moving assembly, a second Y-axis moving assembly and a portal frame module are fixedly installedon the bottom plate. Workpiece jigs are installed on the first Y-axis moving assembly and the second Y-axis moving assembly, the number of the portal frame modules is two, each portal frame module comprises a portal supporting frame, an X-axis moving assembly and a Z-axis moving assembly, and a dispensing device is arranged on each Z-axis moving assembly. The efficient double-gantry dispensing machine has the advantages of being diverse in function, capable of dispensing two kinds of glue, rapid in dispensing action, high in dispensing efficiency, reliable and stable in performance and the like which are not achieved in the prior art.

Overhead crossing type automatic slitting and cutting equipment

Abstract: The utility model discloses overhead crossing type automatic slitting and cutting equipment. The slitting device comprises a feeding device and a slitting device body. A portal frame is arranged between the feeding device and the slitting device, a first guide roller set is arranged on one side of the portal frame, a second guide roller set is arranged on the top of the portal frame, a third guideroller set is arranged on the other side of the portal frame, an automatic protection mechanism is arranged on the other side of the portal frame, and a channel is formed in the middle of the portalframe. According to the equipment, the portal frame is mounted between the feeding device and the slitting device; the portal frame is arranged on the feeding device, so that strip materials of the feeding device are conveyed through the portal frame, in the conveying process, an inspector or a debugger can inspect or debug equipment through the channel, operation is quite convenient, and under the action of the automatic protection mechanism, the danger to the inspector or the debugger due to high-speed operation of the equipment is well avoided.

A shearing mechanism for light guide plate

Abstract: The utility model discloses a shearing mechanism for light guide plate, including portal frame, elevator motor, lift lead screw, lifting fixed plate, shears assembly, location platform subassembly, transverse orientation subassembly, elevator motor fixed mounting is in on the portal frame, the lift lead screw with elevator motor connects, the screw -nut fixed mounting of lift lead screw in on shears assembly's the nut installation piece, install the shears assembly slidable lifting fixed plate, the lifting fixed plate vertical fixation is in the below of portal frame, the portal frame both sides all are equipped with the transverse orientation subassembly. The utility model discloses a compacter structural design reduces the manufacturing cost of whole device effectively, moreover can theautomatic positioning light guide plate, and manual work location and manual clamping need not to go on, improved the shearing precision of light guide plate effectively, improved production efficiency widely.

Digital array type concrete vibrating equipment

Abstract: The utility model discloses digital array type concrete vibrating equipment, which is characterized in that a vehicle frame comprises a portal frame body and a vehicle frame walking mechanism arrangedon the portal frame body, and an end tenon vibrator, a middle vibrator and a vibration supplementing device are arranged in the portal frame body in parallel along the width direction of the portal frame body; the end tenon vibrator comprises end tenon vibrating rods which are arranged at intervals in the length direction of the portal body; the middle vibrator comprises a plurality of middle vibrating rod sets which are suspended at intervals in the length direction of the portal body, and the middle vibrating rod sets at the two ends are side tenon vibrating parts; the vibration supplementing device comprises a vibration supplementing rod which is arranged in an overhanging mode, and the vibration supplementing rod is driven by a vibration supplementing lifting system installed on the trolley to vibrate up and down. The vibrating device is accurate in positioning, does not touch a reinforcing mesh, can synchronously and accurately position and vibrate dovetail joints on the edge when vibrating a bridge deck slab, can supplement vibration to parts which are not vibrated accidentally at the first time, and is uniform in vibration of all parts of the whole body and good in vibration quality of the whole body.

Fuel cell stack turnover equipment and working method thereof

Abstract: The invention discloses fuel cell stack turnover equipment and a working method thereof. The turnover equipment includes a portal frame and a supporting pedestal; the portal frame vertically installedon the position of the two sides on the upper surface of the supporting pedestal; a lifting arm is installed on the vertical side of the portal frame through slide rails; the slide rails are respectively installed on the two sides of supports of the portal frame; the lifting arm is horizontally installed on the portal frame; the other side that the lifting arm is installed on the portal frame isspaced with the first support and the second support; and the first support is movably installed on the lifting arm through a movable disc. Through the turnover equipment installed in the middle position of an electric pile assembly line, an electric pile box can be smoothly clamped and finishes a turnover motion of 180 degrees, so that low efficiency of manual turnover can be avoided, and the speed of turnover can be accelerated; and the external structure of an electric pile box body can be accurately aligned with a pallet, so that demands of industrial mass production can be realized.