Showing papers on "Portal frame published in 2015"

Experimental and numerical study on a full scale apex connection of cold-formed steel portal frames

Abstract: In this paper, experimental and theoretical studies performed on apex connection of an industrial portal frame constructed with cold-formed back-to-back double sigma profile rafters are presented. By those experiments performed, local buckling behavior of the apex plate and load–displacement behavior of the system were investigated under monotonic vertical loading. This investigation was conducted for conditions that the gap between rafter ends at the apex plate are 90, 180, 360, and 450 mm and apex plate is unstiffened/stiffened. Experimental results for the model with 360 mm gap were compared to those of nonlinear quasi-static finite element analyses performed using a finite element software and a good agreement between those results was observed. The connection׳s behavior is controlled by the apex plate. No significant damage occurred on the profiles after the tests. According to the results, it is sufficient to increase the gap between rafter ends up to not higher than 360 mm in order to maximize the general load carrying capacity of the system and the stability of out of plane local buckling behavior of the apex plate. Furthermore, although stiffener plate significantly restricted local buckling of apex plate, no remarkable effect of this enhancement was observed on the flexural capacity of the system.

System and method for automatically measuring dimension and weight of road vehicle

Abstract: The invention relates to a system and a method for automatically measuring dimension and weight of a road vehicle, in particular to an integrated system and an integrated method for rapidly and dynamically measuring the length, width, height and weight of a vehicle, and aims at effectively solving the problems in overloading detection work at present. According to the system, the dimension information of the vehicle is measured in a front and back portal frames manner; the width and height information of the vehicle in a single lane is measured by combination of two two-dimensional laser radars on the front portal frame, so that the measurement problem caused by vehicle deformation can be effectively avoided; and the length information of the vehicle in the single lane is indirectly measured by virtue of a single laser radar on the rear portal frame; and starting and stopping information of the single vehicle is provided for a shaft-type weighing scale by virtue of a laser radar separation vehicle on the front portal frame. The system has the advantages of high measurement speed and high accuracy, and normal running of the vehicle is not affected.

On-line measurement device for vehicle dimension

Abstract: The invention provides an on-line measurement device for a vehicle dimension By ingeniously designing a measurement triggering starting unit, a length measurement unit, a width measurement unit, a height measurement unit, a signal acquisition unit, a portal frame, a measurement display and control console and an LED display screen, accurate measurement to the dimension of the profile of a large-sized vehicle can be realized, and the cost is low and convenience in mounting is realized The intervals among light spots are 10 mm only, so that the phenomenon of light spot overlapping is avoided when light spots are transmitted simultaneously; the positioning is facilitated and the structural strength is ensured since the portal frame is spliced on an installation site and a U-shaped groove structure is adopted at a splicing part Operation is convenient since the whole portal frame is fixed mechanically

Numerical control longmen multiple drilling machine

Abstract: The utility model discloses a numerical control longmen multiple drilling machine belongs to lathe technical field, and is steady inadequately during its solve drill, vibrates big problem (1)The utility model comprises a base (1), work platen on the base, portal frame, the portal frame can be equipped with hard rail planker and power frame along Z axial displacement on the base on the portal frame, and final power frame can be equipped with a plurality of main shafts and gear box at X axial and Y axial displacement in the power frame, and the main shaft is the universal joint, and the main shaft lower extreme is spacing to be changeed at power frame top spin to be equipped with the drill bit at the main shaft lower extreme, drill bit subtend work platen, gear box have input and a plurality of output, and power input device is connected to the input, and the drive ratio of each output is 1: 1, the upper end insert of above -mentioned main shaft is in output department The utility model discloses the power frame adopts boxed structure, and the rigidity is better, the reducible gear box of main shaft to partial the beating of drill bit of universal joint structure, and the dough stability is good

Horizontal diamond wire cutting machine tool

Abstract: Disclosed is a horizontal diamond wire cutting machine tool. The horizontal diamond wire cutting machine tool comprises a tool body (1), the tool body (1) is provided with a rotary worktable (2) for fixing workpieces, a portal frame (15), and a guide wheel group on the portal frame (15), wherein the portal frame (15) can be driven by an X-direction transmission mechanism on the tool body to move in an X direction. The horizontal diamond wire cutting machine tool is characterized in that the beam (10) of the portal frame (15) is provided with a pay-off drum (8) and a take-up drum (9), the stand columns on both sides of the portal frame (15) are respectively provided with an extending plate, and the cantilever end of each extending plate is provided with a cantilever end guide wheel; the extending plates on both sides are driven by the same or a separated Z-direction transmission mechanism to move up and down along the stand columns to control the height and accordingly to maintain a horizontal state so that a diamond wire on the cantilever end guide wheels on the cantilever ends can maintain a horizontal state and participate in cutting of the workpieces. The horizontal diamond wire cutting machine tool is convenient to fixe and high in machining efficiency and yield rate.

Performance of semirigid timber frame with Lagscrewbolt connections: experimental, analytical, and numerical model results

Abstract: This paper presents analytical and numerical models for semirigid timber frame with Lagscrewbolt (LSB) connections. A series of static and reverse cyclic experimental tests were carried out for different beam sizes (400, 500, and 600 mm depth) and column–base connections with different numbers of LSBs (4, 5, 8). For the beam–column connections, with increase in beam depth, moment resistance and stiffness values increased, and ductility factor reduced. For the column–base connection, with increase in the number of LSBs, the strength, stiffness, and ductility values increased. A material model available in OpenSees, Pinching4 hysteretic model, was calibrated for all connection test results. Finally, analytical model of the portal frame was developed and compared with the experimental test results. Overall, there was good agreement with the experimental test results, and the Pinching4 hysteretic model can readily be used for full-scale structural model.

Planer -type work piece device of putting on shelf

Abstract: The utility model discloses a planer -type work piece device of putting on shelf, its characterized in that, it includes that the activity set up on guide rail, the guide rail portal frame, frame motor, activity that the drive portal frame removed along the guide rail set up bracket on the portal frame, connect and follow the elevator motor that lift guiding mechanism reciprocated in the bracket with lift guiding mechanism and the drive carrier who advances between the portal frame, are provided with the feeding and violently send the mechanism on the bracket for send the work piece on the bracket into goods shelves The utility model discloses simple structure operates steadily, and production efficiency is high

Large 3D printing and five-axis linking all-in-one machine

Abstract: The invention relates to a large 3D printing and five-axis linking all-in-one machine which comprises a worktable (1), a 3D printing portal frame (2) and a five-axis machining portal frame (3) and further comprises a numerical control system (11). The 3D printing portal frame (2) and the five-axis machining portal frame (3) are arranged on the worktable. The 3D printing portal frame (2) and the five-axis machining portal frame (3) horizontally move along x-axis guide rails (4-1 and 4-2), and the 3D printing portal frame (2) and the five-axis machining portal frame (3) are provided with y-axis direction moving assemblies (5-1 and 5-2) respectively. The y-axis direction moving assemblies (5-1and 5-2) are provided with z-axis lifting mechanisms (6-1and 6-2), the z-axis lifting mechanism (6-1) is connected with a 3D printing extruding head (7), and the z-axis lifting mechanism (6-2) is connected with a five-axis machining head (8). The large 3D printing and five-axis linking all-in-one machine is particularly outstanding in the aspect of die manufacturing, the processing precision of 3D printing is high, and the machining period is shortened. After a numerical control CNC axis linking is adopted for processing the surface of the die, the die can have a high-standard curved surface and a precise and complex model.

Intelligent height limit portal frame system capable of being lifted and remotely controlled

Abstract: The utility model relates to an intelligent height limit portal frame system capable of being lifted and remotely controlled. The intelligent height limit portal frame system is characterized in that a main structural system is composed of a main structural frame, a pulley is connected with a winch through a steel wire rope, the winch is connected with a lifting cross beam through the steel wire rope, a main portal frame is connected with a prohibition breaking device, the prohibition breaking device is connected with a trigger alarm device connected with a remote control center, the main portal frame is connected with a monitoring system, the monitoring system is connected with the remote control center and a lifting portal frame device, the remote control center is connected with the lifting portal frame device and an emergent response device, the lifting portal frame device sends instructions and conducts real-time monitoring through a wireless network transmission device, and the wireless network transmission device is connected with the remote control center. The intelligent height limit portal frame system has the advantages that the intelligent height limit portal frame system can be automatically regulated to a specified height, the alarm device is triggered in time and sends a feedback to the control center immediately, a traffic management department can conduct emergent responses in time, convenience and rapidness are achieved, and time and labor are saved.

Characterization by full-size testing of pultruded frame joints for the Startlink house

Abstract: Presented in this paper are test results to determine the moment-rotation characteristics of joint details for a portal frame specific to a pultruded fiber reinforced polymer assembly for the Startlink house. Two joints having beam-to-column dowel connections, with and without extra adhesively bonding, were statically loaded in increments of moment or rotation to ultimate failure. The floor beam and stud column members are bespoke closed-sections developed for the Startlink lightweight building system. The serviceability design calculations for the demonstrator house to be constructed in Bourne, England, assumed the frame’s joints to be rigid. Clauses in EN 1993-1-8:2005 have been applied to classify the measured rotational stiffnesses against the rigid requirement, and an evaluation is made of the modes of failure with respect to the joint’s design moments. Only the joint with extra bonding between the mating surfaces of members is found to be classified as rigid. Both joints are shown to have an acceptable joint strength.

Vehicle taking device and use method thereof

Abstract: The invention discloses a vehicle taking device and a use method of the vehicle taking device. The vehicle taking device comprises a translation mechanism, a rotation mechanism and a lifting mechanism. The translation mechanism comprises a translation portal frame, wherein the translation portal frame moves back and forth along a preset track when the vehicle taking device is matched with a stereo garage to be used. The rotation mechanism comprises a rotating portal frame and a rotation driving device, wherein the rotation driving device drives the rotating portal frame to rotate, and one vertical beam of the rotating portal frame and one vertical beam of the translation portal frame are arranged in parallel and are hinged. The vehicle taking device is provided with a counterpoint platform, wherein the counterpoint platform is used for carrying a vehicle parking platform, ascends and descends on the vehicle taking device, and is arranged on the rotating portal frame, the counterpoint platform and two vertical beams of the rotating portal frame are in sliding fit through a lifting base, and the lifting base moves up and down under the action of the lifting mechanism. The vehicle taking device can be independently machined in a batch mode, and is combined with the stereo garage to be applied when the vehicle taking device is used; the vehicle taking device integrates the translation mechanism, the rotation mechanism and the lifting mechanism, so that the stereo garbage does not need to be provided with various mechanisms on each layer and each parking space, and the cost is greatly reduced.

Circular-rail multifunctional drill jumbo system

Abstract: A circular-rail multifunctional drill jumbo system at least comprises crawler track units, a portal frame, a circular rail system and hydraulic drill rigs. The crawler track units form a four-point support jumbo on two sides of the portal frame, the circular rail system is mounted to the front end of the portal frame and supports the hydraulic drill rigs and a stand support device, and the system further comprises an operating platform moving longitudinally along the portal frame. Reliability and continuity in construction operation are improved effectively, the system adapts to full-face and bench-cut-method operation construction in tunnels, 80% of surrounding rock condition construction in a tunnel line can be completed, the crawler track units can realize efficient and flexible steering and balancing control, the system adapts to severe construction operation environments in the tunnels, the operation platform provides an operation platform for operators to approaching to the tunnel face to perform measurement, ruling, explosive filling and the like, the arch set-up device can assist constructors to finish setting-up of a steel arch and pavement of steel meshes, arch set-up operation efficiency is increased efficiency, and labor intensity of constructors is reduced.

Plank flattens, drilling equipment

Abstract: The utility model relates to a plank flattens, drilling equipment, it includes the portal frame, the workstation that resets, clamp plate, horizontal plate, drilling equipment, the clamp plate sets up in portal frame upper portion, the portal frame both sides are equipped with along the top guide bar of vertical direction, be equipped with on the clamp plate with top guide bar assorted through -hole, the top of portal frame is equipped with power device, the middle part of portal frame is equipped with the workstation that restores to the throne, and the workstation that restores to the throne includes workstation, resetting means, is equipped with drilling on the workstation, and the bottom of workstation is equipped with resetting means, and resetting means is including guide arm, reset spring down, through -hole phase -match on the lower guide arm of the vertical orientation of bottom fixed connection of workstation, lower guide arm and portal frame, and the bottom of lower guide arm is equipped with the separation blade, and lower guide arm cup joints the reset spring who lies in between workstation bottom and the portal frame outward, the clamp plate below still is equipped with the horizontal plate, and the bottom of portal frame is equipped with drilling equipment.

Dimension measurement apparatus for truck body

Abstract: The utility model brings forward a dimension measurement apparatus for a truck body. The measurement apparatus comprises a portal frame, wherein a measured truck can pass through the portal frame. A first laser range finder is arranged at a cross beam at the top of the portal frame; and when the truck passes through the portal frame, the first laser range finder points at the top of the measured truck. A 45-degree plane mirror is arranged at the ground when the truck passes through the portal frame; and a third laser range finder is arranged at one opposite side of the surface of the plane mirror. When the truck passes through the portal frame, the light beam of the third laser range finder points at the bottom of the measured truck by the plane mirror. According to the technical scheme, in order to meet the requirement of rapid dimension detection of a van truck body at the area with the severe vehicle refitting phenomenon, the intelligent measurement apparatus for an overall dimension of a van truck body is provided, wherein the apparatus has advantages of rapidness, high precision, non-contact mode realization, and dynamic tracking. Therefore, dynamic tracking can be realized effectively; and the measurement precision is improved.

Corrugated web plate H-shaped steel assembling and welding integrated machine

Abstract: The invention discloses a corrugated web plate H-shaped steel assembling and welding integrated machine, and aims to mainly solve the problems of high machining cost, low machining efficiency, difficulty in guarantee of machining quality and complexity in operation of the existing welding device. The machine is characterized in that a traveling gear on the lower side of a portal frame (1) is arranged on guide rails (2) of a pedestal, wherein a portal frame traveling driving device, a welding execution device, a laser tracking scanning device, a vertical web plate clamping device and an upper wing plate hydraulic righting device are connected to the portal frame (1); a lower wing plate hydraulic alignment locking working table is arranged between the guide rails (2) of the pedestal; the portal frame traveling driving device, the welding execution device, the laser tracking scanning device, the lower wing plate hydraulic alignment locking working table, the vertical web plate clamping device and the upper wing plate hydraulic righting device are connected with a controller. The corrugated web plate H-shaped steel assembling and welding integrated machine has the characteristics of low machining cost, high machining efficiency, capability of guaranteeing machining quality and easiness in operation.

Large-scale portal frame

Abstract: The invention provides a large-scale portal frame. The large-scale portal frame comprises two rails, two trolleys, two stand columns, a movable main beam and a connection beam. Two ends of the movable main beam are respectively erected on the stand columns and are connected to a lifting device. Upper ends of the two stand columns are connected by the connection beam. The large-scale portal frame also comprises at least two counterweight mechanisms, a connection beam adjustment mechanism and two suspention beams for fixing manipulators. The counterweight mechanism comprises a guide wheel group, a suspension cable and a counterweight block. The connection beam adjustment mechanism comprises at least one adjusting nut, at least one adjusting screw and an adjusting seat. The two suspention beams are symmetrically fixed to the movable main beam, one end of each one of the suspention beams is close to the center of the movable main beam and any one of the suspention beams is provided with a horizontal movement mechanism. The manipulators are connected to the suspention beams by the horizontal movement mechanisms. The large-scale portal frame satisfies span and height requirements and is suitable for 3D printing building extruding head arrangement.

Wind loads on the frames of industrial buildings

Abstract: The structural response of typical, gable-end, low roof pitch industrial buildings, in a windstorm is dependent on the wind loads used in the design of cladding and the portal frame structure. Critical, structural wind load effects derived from wind loads measured on a wind tunnel model show that standards such as AS/NZS 1170.2 can produce unconservative design load effects on the heavily loaded first internal frame. This paper forms part of wider study that assesses the vulnerability of hot rolled steel, industrial buildings to wind loads. The knee and ridge bending moments and horizontal and vertical reactions at the base of the frame are the critical load effects that are used in the design of structural members and connections of these types of buildings. This study found that some of these load effects based on external pressures are under-estimated by about 30%, when the building is located in a suburban environment. A dominant windward wall opening can effectively double the design load effects, thus significantly increasing the vulnerability, especially if this scenario has not been considered by the designer.

Welding production line and construction method for bridge plate unit

Abstract: The invention discloses a welding production line and construction method for a bridge plate unit. The welding production line comprises a jig, a portal frame and multiple groups of welding equipment, wherein first ground embedded pieces are arranged on two sides of the jig, rails are arranged on the first ground embedded pieces, the portal frame is mounted on the rails, a traveling motor is arranged on the portal frame, an accommodating platform is arranged on the top surface of the portal frame, and a cable tray is arranged on one side of the portal frame; the jig comprises a jig base body, multiple supports, supporting oil cylinders and multiple locking clamps; each group of welding equipment comprises a CO2 welding machine power supply, a CO2 welding wire feeding mechanism, a CO2 welding automatic welding carriage, a cooling system and a CO2 welding gun, the CO2 welding machine power supply, the CO2 welding wire feeding mechanism and the cooling system are placed on the accommodating platform of the portal frame, the CO2 welding gun is fixed on the CO2 welding automatic welding carriage, so that the construction environment is improved, and interference caused by welding arcs to peripheral construction personnel is reduced and even eliminated.

Pseudo-Dynamic Testing Based on Non-linear Dynamic Substructuring of a Reinforced Concrete Bridge

Abstract: The assessment of the seismic performance of an old concrete bridge was conceived within the RETRO Transnational Activity funded by the SERIES research project. The installation of isolation devices -one per column- for each pier portal frame interposed between the cap beam and the deck was proposed as seismic retrofit, fully complying with Eurocode 8 requirements. A comprehensive set of hybrid simulations was conceived to simulate the dynamic response of the existing 400 m span Rio Torto Viaduct, both in the isolated and the non-isolated cases. In order to support the pseudo-dynamic test design, a refined fiber based FE model of the bridge was implemented in the well-known OpenSEES software; time history analyses highlighted appreciable nonlinearities in the dynamic response of the system under the Serviceability Limit State (SLS). As a consequence, a Numerical Substructure (NS) capable of reproducing such nonlinear behaviour was deemed necessary. Nonetheless, implementation issues relevant to the typical solving time dictated by the controller time step, made the use of complex fiber based FE models not suitable for testing purposes. In this perspective, the paper presents the design of a suitable NS, which is based on a rational and nonlinear reduction of the aforementioned OpenSEES Reference Model (RM). Moreover, in order to impose a consistent degradation of physical and numerical piers, a testing procedure based on recursive identification and model updating sessions is proposed. The numerical tools and simulations developed in the project are presented and discussed.

Automatic drill tool arranging device

Abstract: The invention discloses an automatic drill tool arranging device and mainly aims to solve the problems of low lifting automation degree and high labor intensity of conventional lifting devices in the prior art. The automatic drill tool arranging device is characterized in that a portal frame toothed bar (6) is arranged between two rails of a tooth-type portal frame rail (3) on each single side; a magnetic strip type displacement sensor is arranged on each portal frame toothed bar (6); a portal frame walking driving device (2) is arranged at the front end of each leg of a portal frame (1); a trolley toothed bar (8) is arranged between each pair of tooth-type trolley rails (7) which are arranged transversely on a cross beam of the portal frame (1); a magnetic strip type displacement sensor is arranged on each trolley toothed bar (8); gear-rack type drill tool lifting devices (5) are vertically arranged on sliding trolleys (4); a lower lifting frame of the cross beam of the door frame (1) is connected with a spare clamp (9), a buckle disassembling clamp (10) and a buckle rotating device (11); a drill tool arranging frame (12) is arranged between the tooth-type portal frame rails (3) of the portal frame. The automatic drill tool arranging device has the characteristics of high automation degree and low labor intensity.

High -accuracy numerical control EDM shaping machine structure of planer -type of optimal design

Abstract: The utility model relates to a high -accuracy numerical control EDM shaping machine structure of planer -type of optimal design, including lathe bed, portal frame, ram, headstock, oil groove and workstation. The portal frame adopts the design of triangle crossbeam, can keep the characteristics of longmen structure, has strengthened the rigidity (contrast gate -type portal frame) of portal frame again, L casting box body structure is optimized into for the triangle crossbeam design of cooperation portal frame with the institutional advancement of original cuboid to the lathe bed for the seesaw can be realized on L casting box body upper portion to the triangle portal frame, for stroke and the rigidity of ensureing the XY axle, ram and headstock make the design of bionical box into by original compact design. The whole structure continues to use the planer -type structure through bionical optimal design, and compact structure and stroke are big, and the rigidity is high and can keep long -term high accuracy, and static state and dynamic behavior are splendid.

Shelf type non-avoiding 3D parking device

Abstract: The invention relates to a shelf type non-avoiding 3D parking device. The device comprises a supporting guide rail, a pallet, and a driving assembly which drives the pallet to move, rotate and lift, wherein the driving assembly is arranged on the supporting guide rail and can move along the supporting guide rail; a portal frame for bearing the pallet is arranged beside the inner side of the driving assembly and is static relative to the supporting guide rail; the rear part of the driving assembly is guided in match with the portal frame. According to the parking device, a landing portal frame is arranged and firmly fixed on the ground, the driving assembly is synchronously guided in match with the supporting guide rail and the portal frame, thus the stability of the device can be greatly improved, the good inclining effect is positioned, and the wear of part due to the deformation of the device can be effectively reduced; meanwhile, when the pallet is positioned above, the pallet can be positioned and borne through the portal frame, so that a lifting mechanism can be avoided being in a full-load state for a long term, and the service life can be prolonged.

The structural behaviour in fire of a cold-formed steel portal frame having semi-rigid joints

Abstract: This paper describes a non-linear finite element study into the effects of elevated temperature on a cold-formed steel portal frame having semi-rigid joints. Numerical modelling was carried out using ABAQUS finite element analysis software with shell elements used to capture localised buckling effects. Results for the ambient shell models are compared against previous full-scale tests. Material properties are taken from the literature, in order to predict the behaviour of the frame at elevated temperature. The results of finite element beam models are compared against those of shell models to enable comparison. At elevated temperature, shell models are shown to detect failure much earlier within the fire. Therefore shell models are recommended for such studies, for a conservative approach.

Low-and-medium-frequency surface shape rapid detecting device and method for large-caliber optical elements

Abstract: The invention discloses a low-and-medium-frequency surface shape rapid detecting device and method for large-caliber optical elements The device comprises a numerical control computer case, a main control computer, a measuring portal frame, a dynamic interferometer, an interferometer fine adjusting mechanism, a working platform and air floatation guide rails The dynamic interferometer is mounted on the interferometer fine adjusting mechanism which is mounted on a beam of the measuring portal frame, and the measuring portal frame is disposed on the air floatation guide rails The measuring portal frame and the interferometer fine adjusting mechanism are connected with the numerical control computer case through cables The main control computer is connected with the numerical control computer case and the dynamic interferometer through signal lines Measuring main control software, dynamic interferometer measuring software and global wave surface fitting evaluation software are mounted on the main control computer By means of the device, sub-aperture data global wave surface fitting can be performed to obtain low-and-medium-frequency surface shapes of large-aperture surfaces to be tested, and accordingly, the sensitivity of interference measuring towards the environment is reduced, the requirement for measuring system geometric accuracy is reduced, the equipment integration level is high, the detection efficiency is high, and the measuring can be extended to be performed in the workshop environment

Light tilting-type rapid elevating forklift truck

Abstract: The invention relates to the field of elevating forklift truck devices, and discloses a light tilting-type rapid elevating forklift truck device made of a metal material. The device is provided with a high door-shaped portal frame and a low door-shaped portal frame, wherein the low portal frame is fixedly mounted on legs; the high portal frame and the legs are flexibly mounted together through support shafts at the lower end, and can tilt to facilitate the loading and unloading operation of objects. According to the device, hand wheels are pulled by double hands to drive a reel to wind and unwind a steel wire rope, so that the objects are supported and elevated by a pallet fork; the steel wire rope penetrates through a pulley block consisting of a fixed pulley suspended on the high portal frame and a movable pulley on a goods shelf frame, so that a labor-saving effect is achieved; the radiuses of the hand wheels are larger than or equal to the radius of the reel, so that the labor-saving effect is also achieved; by virtue of rollers at the four corners of the goods shelf frame, the goods shelf frame can be balanced and stably move up and down in the planes of the portal frames.

Vertical shears-fork type yielding-free stereo garage

Abstract: The invention relates to a vertical shears-fork type yielding-free stereo garage which comprises shears-fork mechanisms on the two sides of a parking space. The rear end of the parking space is provided with a four-stand-column portal frame. A winding plant on the four-stand-column portal frame pulls and lifts a rotary disk bracket through a steel rope, and therefore an automobile tray can ascend and descend. A small rail car is arranged below the four-stand-column portal frame. A small rail car motor driving mechanism horizontally moves on a rail. The shears-fork mechanisms are provided with ground pulleys. The rotary disk bracket is arranged on the upper portion. The automobile tray is attached to the upper portion of the rotary disk bracket. The rotary disk bracket and the portal frame achieve locked protection through an electromagnetic pin. By means of the vertical shears-fork type yielding-free stereo garage, stereoscopic parking can be achieved in two layers of stereo garages in the mode that the bottom layer of stereo garage can be free of yielding, structure stress is relatively reasonable, a hoist rope chain system or a hydraulic system can be used as a driving source, various power sources can be provided, interference is not likely to be formed, and vertical shears-fork type yielding-free stereo garage is safe and reliable.