Showing papers on "Portal frame published in 2010"

Damage Identification in Frame Structures Based on FE Model Updating

Abstract: This paper proposed a practical damage detection method for frame structures based on finite element model-updating techniques. An objective function is defined as minimizing the discrepancies between the experimental and analytical modal parameters (namely, natural frequencies and mode shapes), which is set as a nonlinear least-squares problem with bound constraints. Unlike the commonly used line-search methods, the trust-region approach, a simple yet very powerful concept for minimization, is employed in order to make the optimization process more robust and reliable. Noting the objective function may sometimes be underdetermined for complex structures due to a relatively larger number of potential damaged elements, this paper attempts to propose a simple and convenient solution by expanding the original objective function. Moreover, the relative weighting scheme between different parts in the objective function is also investigated. One numerical two-story portal frame structure and two laboratory-tested frame structures, including a simple three-story steel frame structure and a more complex frame structure with bolted joints, are all adopted to evaluate the efficiency of the proposed technique. Some important issues about the application of the proposed method are also discussed in this paper.

Combined type automobile white body dynamic and static state performance flexible integrated test system

Abstract: A flexible integrated test system of dynamic and static properties of a combination automotive body-in-white comprises a portal frame, a support restraint device, an adjustable concentrated force loading device, a torsion pendulum frame loading device and a measuring appliance assembly. The support restraint device for supporting the automotive body-in-white to be tested is fixed on the portal frame, the measuring appliance assembly is fixed on the portal frame by a support or directly fixed on the portal frame, the adjustable concentrated force loading device and the torsion pendulum frame loading device which loads stress on the automotive body-in-white to be tested are fixed on the portal frame or arranged on the peripheral side of the portal frame. The flexible integrated test system of dynamic and static properties of the combination automotive body-in-white has the advantages of simple and compact structure, reasonable layout, convenient operation, comprehensive function, wide application and good expansibility.

Effects of Semi-Rigid Connection on Structural Responses

Abstract: There are several idealizations in numerical analysis of structures. In the joints and supports, which is usually assumed to be pinned or rigid, semi-rigid connection should be considered to obtain more realistic, reliable and also economical results. In this study, rotational spring stiffness-connection ratio relation is clearly explained and revealed. A finite element program SEMIFEM is developed in FORTRAN language for the numerical analysis. This program provides to define semi-rigid connections in terms of rotational spring stiffness or connection ratio simultaneously. In the numerical applications, rotational spring stiffness - connection percentage relation of the semi-rigid connected structural members is submitted. Semi-rigid connections are considered in column-to-foundation connection of a portal frame, beam-to-column connection of a prefabricated structure, steel brace connection to reinforced concrete (RC) frame of a steel X-braced RC frame and truss member connection to joint of a steel truss system. The variation of moment, shear force, axial force, displacement and stress is investigated in a selected axis of the structures. Numerical examples are performed with respect to connection percentage of the related structural members by using finite element method. According to finite element analysis results, the degree of the semi-rigid connection is important as much as its existence in the design phase. This study reveals that the effect of semi-rigid connections on structural systems shows different variations from structure to structure.

Optimizing Structures Subject to Multiple Deflection Constraints and Load Cases Using the Principle of Virtual Work

Abstract: This paper presents an iterative automated method for optimizing structures with multiple deflection criteria and load cases. The method is based on the principle of virtual work. Discrete sections are selected for structures with fixed geometries. An optimal structure is one which meets all strength and deflection criteria using minimal material. Four case studies are considered in this paper. A simple portal frame is presented to show how the method works. A 60-story frame is optimized to demonstrate the effectiveness of the method for large structures. A warehouse designed by professional engineers is presented to show how the method can be used for structures subjected to complex loading conditions and deflection criteria. The automated method’s solution is 4.5% lighter than the engineers’. Finally, a stepped cantilever is optimized and compared to results in literature. Material savings of up to 14.4% are realized.

Mobile hoisting portal frame

Abstract: The utility model discloses a mobile hoisting portal frame, wherein a pulley on which a chain block is suspended is arranged on an I-shaped cross beam of a portal frame, two cross bars are arranged onthe bottoms of two vertical columns of the portal frame and two ends thereof are provided with screwed holes, two ends of four diagonal braces are respectively arranged on one ends of the cross barsand the middle portions of the vertical columns of the portal frame, two fixed wheel stands with rollers are arranged on two ends of one cross bar through welding, two movable wheel stands with rollers are arranged on two ends of the other cross bar through rotation shafts, four studs are screwed in the screwed holes on two ends of the two cross bars, the lower ends of the studs are provided withbottom boards, and the upper ends of the studs are provided with handles. The portal frame is suitable for transporting or suspending spare parts during assembling devices and overhauling devices onsite, has simple structure, flexibly moves, is not limited by places, is simply operated, effectively solves the problems of hoisting and transporting the spare parts of devices, improves the working efficiency and reduces the cost and the labor intensity.

Concrete lining steel formwork jumbo

Abstract: The invention discloses a concrete lining steel formwork jumbo, comprising a portal frame and a bracket, wherein a translational hydraulic jack and a hoisting hydraulic jack are fixedly arranged on the end face of the portal frame, a left arc-shaped top template and a right arc-shaped top template are fixedly welded on the bracket, the lower ends of the left arc-shaped top template and the right arc-shaped top template are respectively hinged with a left arc-shaped side template and a right arc-shaped side template which extend downward to the lower ends of the portal frame, a plurality of hydraulic jacks and screw jacks are hinged between two side walls of the portal frame and the inner walls of the left arc-shaped side template and the right arc-shaped side template, a left translational travelling straight girder and a right translation travelling straight girder are fixedly welded on the bottom of the portal frame respectively, and the bottom of the left travelling straight girder and the right travelling straight girder are respectively provided with pulleys and track jacks. The machine can travel on paved track upward, downward, leftward and rightward, thereby meeting height and width requirement at different sections in a tunnel. The invention has the advantages of easy operation and maintenance, saves cost effectively, and reduces construction difficulty and working strength.

Portal frame movable type horizontal coordinate numerical control ultrasonic welding machine

Abstract: The invention discloses a portal frame movable type horizontal coordinate numerical control ultrasonic welding machine, which is characterized by being special welding processing equipment integrated by an ultrasonic welding machine and a numerical control machine. In the invention, a box type fixed work bench and a movable portal frame are adopted in a machine structure, a controlled driving air cylinder, a high-power ultrasonic vibrator and a welding head are arranged on a transverse towing plate arranged on a portal frame beam; the high-power ultrasonic vibrator provides a vibration source, a numerical control system controls a servo motor and a screw rod system to drive the portal frame, the transverse towing plate and a horizontal coordinate target seeking according to a program, the up and down stretching of the air cylinder drives the high-power ultrasonic vibrator, and the welding head carries out welding and resetting. The invention overcomes the problems and defects of high cost, low efficiency, incomplete usage of the equipment and processing equipment resource waste; and by numerical control target seeking and automatic welding point to point and hop to hop at a variable time, the invention enables the numerical control and the automation of the ultrasonic welding of a more complex large work piece to achieve the purposes of low cost, high efficiency and high quality.

Online automatic detection and adjustment device for tension of cage guide rope

Abstract: The invention discloses an online automatic detection and adjustment device for the tension of a cage guide rope, relating to mining equipment. The detection and adjustment device comprises four parts of an upper-well tensioning mechanism, a lower-well fixing device, a PLC centralized console and a centralized control hydraulic station; the tensioning mechanism comprises a portal frame, a self-locking upper card, a self-locking lower card and two hydraulic cylinders; the portal frame is fixed on the upper jacket frame beam of a vertical shaft; the self-locking upper card, the self-locking lower card and the two hydraulic cylinders are respectively fixed on the portal frame, the piston rod is connected with the self-locking upper card and the self-locking lower card; the upper end of the cage guide rope is fixed on the upper end of the portal frame, and the lower end is fixed on the lower jacket frame beam of the vertical well. The tension of the cage guide rope can be detected on line automatically, comparing the detection value with the set standard value, the device can automatically adjust the tension of the cage guide rope to a standard value by the centralized control of PLC, thereby effectively ensuring the cage guide rope to work under a stable tensioning state, in addition, the device can realize remote control, and the installation and adjustment are extremely convenient.

Cellular beam-columns in portal frame structures

Abstract: Theoretical and numerical research into the application of cellular beam-column members in portal frame structures Two failure mechanisms requiring additional research if cellular beams are to be applied as column members, have been investigated: 1) member flexural buckling, and 2) local web-post buckling The flexural buckling behaviour of cellular columns has been shown to be similar to that of plain-webbed beams A simplified design rule is proposed for checking the ultimate flexural buckling load capacity of cellular columns, and is shown to yield safe results From an extensive parameter study an approximately linear relation between the web-post buckling capacity and an applied axial force has been shown to exist Even although this influence is not effectively accounted for in the present available models for web-post buckling, these still turn out to be sufficiently conservative to be applied in column design Results are applied to the design of a portal frame consisting entirely of cellular members, by means of a design tool developed in Microsoft Excel using VBA This tool has been validated against 2D and 3D finite element analyses for different load cases using the finite element software SAFIR

Experimental research on hysteretic behavior of light-weight steel portal frame

Abstract: Light-weight steel portal frames were tested under vertical and cyclically horizontal loads,where the maximal width-to-thickness ratios of web reached 94.05,exceeding the limitation by current code of 'Code for seismic design of buildings'(GB 50011—2001).In the tests,the deformation concentrated in the beam segment nearby the beam-column connections and beam-to-beam connections,and at the same place local buckling appeared which led to the final failure of frames.Based on the experimental load-displacement curves the ductility factor was computed as 3.09,indicating that the deformability of frames was fine.Finite element analysis was carried out considering monotonic and cyclic loads.By comparing with tests results,the validity of finite element analysis was proved.Furthermore the seismic capacity of this type of frame was analyzed.The results indicate that the frames fail when local buckling occurs at several segments so that a hinge like mechanism forms,and the limitation of horizontal displacement may not be so strict as the current code if the frame is only subjected low gravity loads.The concept of unit energy efficiency ratio,defined as the ratio of frame energy absorption to steel consumption,is proposed to estimate the seismic capacity and design rationality.

Experimental study of the seismic response of container cranes

Abstract: As container traffic increases, ships and the cranes that serve them also continue to grow. The larger size and mass of modern container cranes makes them more seismically vulnerable then their predecessors. Container cranes are essential for port operations, and economic losses from their downtime can be substantial. A container crane can be divided into three main sections: the portal frame, a second story and the A-frame. The majority of the response of a container crane to dynamic loading occurs in the portal frame. This study investigates a way to model the container crane without the A-frame, while maintaining the same response in the portal frame. Finite element models of a complete container crane and cranes with modifications to simulate the proper mass and stiffness distribution without the A-frame are created. These results are used to design a large scale model for a shake table experiment that investigates the three failure modes previously observed in earthquakes: derailment, local buckling of the legs, and collapse. Copyright 2010 ASCE.

Portal traveling crane fault detection machine

Abstract: The utility model relates to the field of nondestructive fault detection of large-scale spiral steel pipes, in particular to a portal traveling crane fault detection machine, which is characterized in that the portal traveling crane fault detection machine comprises rails, a portal traveling crane frame, traveling crane wheels, a driving gear, a traveling crane speed reducing machine, a support roller, a welding seam probe frame, a mother plate probe frame, an ultrasonic mother plate fault detection instrument, an ultrasonic welding seam fault detection instrument and a fault detection machine control system, wherein the rails are parallelly arranged on a basic framework, the support roller is arranged between the rails, the support roller is connected with a support roller transmission device, racks are arranged at the side edges of the rails, the traveling crane wheels are arranged between the rails and the portal traveling crane frame, the traveling crane speed reducing machine is arranged on the portal traveling crane frame, the traveling crane speed reducing machine is connected with the driving gear, and the driving gear is engaged with the racks arranged at the side edges of the rails. Compared with the prior art, the utility model has the advantages that a portal frame with a large size is omitted, a portal traveling crane directly moves on the rails arranged on the ground, the structure of the fault detection machine is simplified, and the advantages are more obvious for the ultrasonic nondestructive fault detection of large-scale spiral pipes to be detected with the diameter greater than 3m.

Bogie fatigue testing stand

Abstract: The utility model relates to a bogie fatigue testing stand, which comprises a control system and a mechanical system; the control system is connected with the mechanical system by an actuator; the mechanical system comprises a workbench and two portal frames; each portal frame comprises upright columns and lateral beams; longitudinal beams are mounted between the lateral beams of the two portal frames. The utility model has a reasonable structure and convenient operation; adopts a double portal frames mechanism, connects two portal frames by two longitudinal beams. The testing stand can be used for performing three tests at the same time, increases test efficiency greatly; and increases the test loading tonnage for the same design weight. The testing stand of the utility model can apply transverse and longitudinal load conveniently; at the same time, two longitudinal beams are connected between the two portal frames; small transverse beams can be mounted on the longitudinal beams; in this way, the vertical load can be applied at any point in the platform scope.

Height-limited portal frame

Abstract: The utility model discloses a height-limited portal frame, which comprises upright columns and a cross beam disposed at upper ends of the upright columns. The height-limited portal frame is characterized in that the lower end of the cross beam is provided with anti-impact short beams and a movable hanging object, the distance from the lower end of each anti-impact short beam to the lower end of the cross beam ranges from 15mm to 20mm, and the distance from the lower end of the movable hanging object to the lower end of the cross beam ranges from 30mm to 40mm. The anti-impact cross beams are short beams which are arranged at intervals. The anti-impact short beams can stop ultra-high vehicles from passing forcedly, and when the ultra-high vehicles can produce sound when impacting to the movable hanging object so as to remind drivers of the ultra-high vehicles to drive the vehicles away from the roadway. Compared with the prior art, the height-limited portal frame emphasizes people foremost, reduces damage to vehicles, drivers and passengers to the utmost extent while protecting bridges, not only stops the ultra-high vehicles, but also guides the ultra-high vehicles to be away from the roadway by aid of height-limited marks on the portal frame.

Early warning portal frame system of ultrahigh vehicle at height-limited road section

Abstract: The invention relates to an early warning portal frame system of an ultrahigh vehicle at a height-limited road section, comprising a detection portal frame, a warning portal frame and an impact portal frame. The safety height is marked on the detection portal frame and a shading detector is arranged on the detection portal frame. The warning portal frame is provided with an LED (Light Emitting Diode) dot lattice display for prompting the ultrahigh vehicle. The shading detector works by adopting an infrared shading principle. The impact portal frame is used for preventing the impact of the ultrahigh vehicle and a structure at the upper part of the height-limited road section. The invention reduces the possibility of the rigid impact of the ultrahigh vehicle, simultaneously reduces the secondary hazards of rear-end impact of vehicles, traffic jam and the like and has huge social and economic benefits.

Digital control equivariant section H profile steel automatic assembling machine

Abstract: The utility model relates to a digital control equivariant section H profile steel automatic assembling machine. The front part of the assembling machine is in a portal frame structure. The upper part of a framework is provided with a pushing oil cylinder which is connected with a movable beam. The movable beam is provided with an elevation welding automatic tracking frame. A lower wing plate locating box and the clamping box thereof are placed on a portal base. An input raceway is arranged under a portal frame. The framework at the two sides of the raceway is provided with a web plate automatic centering clamping shaft. A conveying motor is connected with a driving roller. A conveying chain wheel on the driving wheel is connected with a rod on the input raceway by a chain. The welding line is tracked automatically. Two pneumatic tracking welding guns for welding an upper wing plate are fixed on the beam, which vary along with the variation of the height of the H profile steel web plate; therefore, the equivariant section H profile steel can be welded. The two pneumatic tracking welding guns for welding a lower wing plate are fixed on an upright post. The welding gun is firmly fixed. The welding line quality is stable and reliable.

Gantry type frame for detecting white body performance of automobile

Abstract: The invention discloses a portal frame used for automotive body-in-white performance detection. The portal frame comprises cross beams, stringers, truss structure square columns, a clamping device and a mounting base with a plurality of T-shaped grooves. Four truss structure square columns are arranged in a rectangle, each truss structure square column consists of four vertical bars and a plurality of cross bars, a plurality of the cross bars are arranged in parallel on the column surfaces of the truss structure square columns and connected between two vertical bars, the cross bars on the symmetrical column surfaces of the truss structure square columns are symmetrically arranged, the bottom of each truss structure square column is provided with a base board which is fixed on a mounting base by fasteners arranged in the T-shaped grooves, two cross beams and two stringers are provided and respectively connected with the cross bars on the corresponding truss structure square columns by a clamping device. The portal frame used for the automotive body-in-white performance detection has the advantages of wide application range, enough overall strength and rigidity, convenient disassembly and assembly, and convenient climbing and regulation for operators.

Engineering Advances in Cold-Formed Steel Hollow-Flange Long Span Beams

Abstract: Cold-formed steel beam sections remain an economic structural option in many applications given the cost & other advantages in their manufacture, efficiencies in section properties and material properties, and ease of handling, fabrication and connections - all relative to hot-rolled steel. However, they have not commonly been associated with high-load beam applications due to potential for localised instability in open sections necessitating additional stiffening elements or substitution by heavier sections. The development of hollow-flange sections has raised the upper limit of bending performance for cold-formed steel members and now recent innovation in relatively simple, high-capacity moment connections has further added to the suitability of these for high-load applications as a competitive alternative to hot-rolled sections. Case study details are given for an application of hollow-flange Long Span Beam in portal frame construction to be sited in Region D cyclonic conditions, including performance testing of innovative moment connections. Other developing applications include high-efficiency fabricated trusses, structural plan bracing, and fixed-ended purlin connections. These developments have largely been the result of critical engineering study of design and construction aspects in the use of steel to maximise the structural performance while minimising the construction limitations typically associated with steel.

Novel forklift portal frame

Abstract: The utility model relates to a novel forklift portal frame, which solves the technical problem of providing a novel forklift portal frame which has a short lift oil cylinder and can further save forklift oil box space. The novel forklift portal frame comprises an inner portal frame, an outer portal frame, a pallet fork frame and a pallet fork; the bottom portion of the lift oil cylinder is fixed to the lower portion of the outer portal frame; a chain wheel is installed on the top portion of a piston rod; an inner portal frame chain wheel corresponding to the position of the chain wheel vertically below is arranged on the top portion of the inner portal frame; and a chain sequentially bypassing the chain wheel and the inner portal frame chain wheel is connected with the pallet fork frame. The length of the lift oil cylinder is reduced by one half; the freight lifting speed of a forklift is increased by one time in the same time; simultaneously hydraulic oil needed by work is decreased by one half; and material cost is saved. Moreover, the novel forklift portal frame saves the volume of a forklift oil box, reserves more forklift body space for counterweight, and reduces cost as materials with comparatively small density and inexpensive prices can be selected for counterweight.

Numerical control laser processor

Abstract: The utility model discloses a multi-shaft ganged numerical control laser processor. The structure of the numerical control processor is as follows: a beam of a portal frame is provided with a linear guide rail; a robot sliding table is arranged on the linear guide rail; a first servo motor is arranged on an upright of the portal frame; a motor controls the robot sliding table to move along the linear guide rail; a robot is fixedly connected on the robot sliding table and inversely hung on the beam of the upright of the portal frame through the sliding table; a laser processing head is arranged on the robot; the processing head is connected with a laser device by optical fiber; a cooler is respectively connected with the laser device and the laser processing head by cooling pipes; a work bench is positioned below the portal frame, a headstock is fixed at the end part of the work bench, and a tailstock is movably arranged on the work bench; a second servo motor controls workpieces to be processed on the work bench to move relative to the portal frame; and a controller is respectively connected with the robot and the sliding table by control lines. The multi-shaft ganged numerical control laser processor improves the flexiblized and automated control capability of laser processing, and can meet the requirement on numerical control laser processing of big-size and super-size parts.

Integral portal type machine tool body

Abstract: The utility model discloses an integral portal type machine tool body, which comprises a machine tool body (10) and a portal frame (20). The machine tool body (10) and the portal frame (20) are combined to form an integral body. Two X-direction X-axis guide track mounting surfaces (1) are arranged at the upper end of the portal frame (20), and an X-axis component mounting groove is formed between the two X-direction X-axis guide track mounting surfaces (1). A U-shaped structure is arranged in the side surface direction at the upper part of the portal frame (20). A tool storage mounting hole (2) is arranged on the portal frame (20). A cuttings chute (8) is arranged inside the machine tool body (10), and a cuttings hole (5) is arranged on the machine tool body (10) and has one end thereof communicated with the cuttings chute (8) and the other end thereof communicated with the outer side of the machine tool body (10). The integral portal type machine tool body has the advantages of compact structure, small floor area, high rigidity, convenient processing, low deformation lability, high precision retaining capacity, short production cycle and low cost; and is especially suitable for machine tools for processing charging turbine blades and other small-sized parts.

Light steel portal frame

Abstract: The utility model discloses a light steel portal frame, which comprises common side columns, a Y-shaped central column, a herringbone beam and a prestressed cable, wherein the Y-shaped central columnheads are articulated with the herringbone beam; the included angle of the branch and the horizontal line is 30-60 degrees; the herringbone beam adopts a two-stage variable cross-section component, the part close to the common side columns is a wedge-shaped variable cross-section beam, and the middle part is a uniform cross-section beam; and the prestressed cable adopts the high-strength round steel, both ends of the prestressed cable are respectively articulated with the Y-shaped central column and the herringbone beam, one end or both ends of the prestressed cable can exert the prestressed force on the cable by adopting the method of nut screwing, or exert the prestressed force in the middle of the cable by adopting a right-hand and left-hand sleeve. Theoretical and numerical analysis shows that the Y-shaped central column and the prestressed cable effectively reduce the bending moment and mid-span bending moment of a middle support of the herringbone beam, lead the bending moment ofthe herringbone beam to be uniformly alleviated, and effectively reduce the mid-span deflection of the beam at the same time, therefore the light steel portal frame is particularly applicable to thelarge space structure with more than 30m span.

Hierarchical speed governing device of fork truck portal frame

Abstract: The utility model relates to a hierarchical speed governing device of a fork truck portal frame, which aims to solve the problem of the forklift series fork truck applied in the prior market that the lifting speed of the portal frame is hard to control, and safety hazard lurks therein, and has a structure that height sensors are fixedly arranged on the two corresponding guide rails of the portal frame, the height sensors are in signal connection with the input end of a programmable controller, one output end of the programmable controller is in signal connection with a monitor, the other output end of the programmable controller is in signal connection with an adjustable speed circuit, and the adjustable speed circuit is in signal connection with a drive motor The utility model adopts the height sensors to monitor the lifting height of the portal frame, and adopts the height sensor signals after being processed by the programmable controller to adjust the lifting speed of the portal frame, thereby ensuring the safety and stability in loading cargo

Portal frame structure of wooden building

Abstract: PROBLEM TO BE SOLVED: To provide a portal frame structure of a wooden building having high deformation performance and prevented from collapsing even at the ultimate condition SOLUTION: The portal frame structure 1 of the wooden building includes a foundation 2, a pair of column members 3, a beam member 4, foundation column joint fittings 5 and column-beam joint fittings 6 The beam member 4 is installed in a beam-priority manner with respect to the column members 3 Each foundation column joint fitting 5 is fixed to the foundation 2 through a plurality of anchor bolts 23 and fixed to a lower end face 31 of the column member 3 through a plurality of lug screw bolts 7 Each column-beam joint fitting 6 is fixed to an upper end face 32 of the column member 3 through a plurality of lug screw bolts 7 and connected to the beam member 4 through a plurality of drift pins 8 The portal frame structure 1 satisfies the relationship of maximum proof stress of the lug screw bolt 7> maximum proof stress of the drift pin 8, maximum proof stress of the lug screw bolt 7> maximum proof stress of the anchor bolt 23, and yield proof stress of the drift pin 8> yield proof stress of the anchor bolt 23 COPYRIGHT: (C)2010,JPO&INPIT

Portal numerical control intermediate-frequency quenching machine tool

Abstract: The utility model relates to a portal numerical control intermediate-frequency quenching machine tool, which comprises a portal frame, wherein the portal frame is horizontally provided with a cross beam which is provided with a vertical sliding plate; a transformer hanging basket provided with a quenching transformer is arranged at one vertically-downward end of the sliding plate and is provided with an infrared thermodetector and an optical fiber thermometer; a heating inductor and an air jetting device are arranged below the transformer hanging basket; and a trolley capable of freely moving is arranged below the heating inductor and the air jetting device. In the quenching process, the utility model can accurately calculate the feeding speed of the trolley, widen the adjusting range of the moving speed of the trolley, realize the feeding at high speed and the retraction at low speed and greatly improve the efficiency; meanwhile, data of the current, the voltage and the temperature in the quenching process can be accurately acquired in time, thus the quenching precision can be greatly improved; and on the other hand, an automatic control instrument is adopted, thus the safety and the reliability for the equipment operation can be improved.

Movable Bailey beam steel bracket made of cast-in-place rigid frame bridge top plate concrete

Abstract: The utility model discloses a movable Bailey beam steel bracket made of cast-in-place rigid frame bridge top plate concrete, which is combined into a movable portal frame structure by a lower longitudinal beam (1), an upright column (2), an upper longitudinal beam (1), a Bailey beam (4), a traveling wheel (5), an adjustable support (6), a steel plate (7) and the like. The lower longitudinal beam (1) is placed on the adjustable support (6); the traveling wheel (5) is mounted under the longitudinal beam (1); the upright column (2) is fixed between the upper longitudinal beam (1) and the lower longitudinal beam (1); the Bailey beam (4) is fixed on the upper longitudinal beam (1); and the steel plate (7) as a template is placed on the Bailey beam (4). The rigid frame bridge top plate concrete is cast on the Bailey beam steel bracket; and after the strength of the top plate concrete is reached, new rigid frame bridge top plate concrete can be continuously cast through moving the Bailey beam steel bracket to a next section. The movable Bailey beam steel bracket can be reused for more times and save the construction period; and moreover, an expressway can continue to open to traffic in the casting and the construction of the rigid frame bridge top plate concrete, and traffic blockage and route change are not required.

Marble composite plate compounding equipment

Abstract: The utility model relates to marble composite plate compounding equipment, which comprises a portal frame, a base plate, regulation mechanisms and a pressure mechanism, wherein the base plate is used for placing cohesive bodies, the regulation mechanisms are used for correcting the positions of the cohesive bodies, the pressure mechanism is used for exerting pressure on the cohesive bodies, the base plate is arranged between two side walls of the portal frame, the regulation mechanisms are in two groups respectively arranged on the two side walls of the portal frame, and the pressure mechanism is arranged on a top beam of the portal frame. The utility model is used for compounding marble and carrier materials, and has the effects of high production efficiency and high product quality.

Camera bracket used on portal frame-type LED lamp welding machine

Abstract: The utility model discloses a camera bracket used on a portal frame-type LED lamp welding machine. The camera bracket comprises a portal frame and a camera. A boom extending forward is arranged on the cross bar of the portal frame; a clamping rod is transversely inserted in the tail end of the boom; a camera is inserted in the clamping rod; and the boom is in slide fit with the cross bar of the portal frame. By adopting the technical scheme, the camera can be adjusted back and forth, left and right, and up and down as well as be adjusted rotationally in the transverse and vertical directions, so that the camera bracket is convenient for adjusting the camera to aim at working areas.