178results about How to "Meet transportation needs" patented technology

A combination of electric car and power road features that each electric car has a chassis, an electric receiving wheel unit arranged in the chassis and an automatic drive system, and said power road is characterized by that each lane on the road has a concave electric power supplying rail matched with said electric receiving wheel unit of each car.

Systems, methods and techniques are presented for discovering optimal solutions to satisfy communication traffic demands to a NGSO and GSO satellite constellations used for telecommunication. When multiple ground demands (mobile and stationary) are present, a satellite constellation requires an assignment of satellite resources to optimally match the ground demands. The systems, methods and techniques presented can utilize an optimization structure to maximize the objective function, using linear programming in combination with simulation and predictive features. The techniques presented determine optimal or quasi-optimal allocation of scarce and highly constrained satellite resources in an efficient manner. These techniques take into account maximizing capacity while protecting other geostationary and non-geostationary networks.

The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The base station obtains measurement information from a user terminal, and determines a cell-edge user, transmits information of the cell-edge user in the cell, receives information of a cell-edge user in an adjacent cell; according to the information of cell-edge users in the cell and the adjacent cell, establishes a virtual cell including the cell-edge users, transmits configuration information of the cell-edge user in the cell and configuration information of the cell to base stations each of which a cell-edge user in the virtual cell is located at, and receives configuration information of each cell-edge user and configuration information of a cell where the each cell-edge user is located from a base station where the each cell-edge user is located, and configures uplink-downlink resources and a transmission mode for the virtual cell.

The invention discloses an intersection signal optical control method in an environment of Internet of vehicles. A signal timing plan is optimized by combining vehicle state information acquired at a signal intersection in real time, so that the delay time that a vehicle passes through the intersection is shortened. The method disclosed by the invention realizes an actual application of the technology of Internet of vehicles at the signal intersection, thereby favorably improving the traffic efficiency at the signal intersection.

The invention discloses an automated guided railless carrying train with flexibly configured kinds of carrying trains, and belongs to the field of automation transporting equipment. The carrying train is divided into automated guided power carrying carts, power carrying carts and / or servo carrying carts. Each carrying train comprises one or more automated guided power carrying carts, every two carrying carts are connected through a three-dimensional independent freedom degree push-pull device, and the whole carrying train is pulled by the automated guided power carrying carts to travel along a guide path. According to the automated guided railless carrying train disclosed by the invention, the capacity for controlling the moving trajectory of automated guided trains can be reinforced, the steering motility of the automated guided trains is improved, and the phenomena that the automated guided trains are mutually crashed, the automated guided trains are driven out of the guide path or the carrying trains tilt to one side and turn over in the practical operation process are avoided. The invention also discloses an operation control method of the carrying train.

The invention discloses a railway piggyback container transportation flatcar which comprises an underframe. Platforms are arranged on two sides of the underframe, a movable saddle is arranged on the platform on one side, the middle of the underframe is recessed downwards to be of a concave base structure, a tire fixing device is arranged in the concave base structure, a plurality of rollover type container locks are fixed to the side of the concave base structure, a plurality of pulling overturning type container locks are fixed to the platforms on the two sides of the underframe, the head end of the underframe is provided with a braking system, and the tail end of the underframe is provided with a hook buffering system. The railway piggyback container transportation flatcar has functions of loading a transportation semitrailer and a container, the underframe is of a concave base structure free of a middle beam, and requirements of bearing the maximum height of the semitrailer are met. The saddle for bearing the semitrailer and a device for limting semitrailer tires are mobile devices, and transportation requirements of semitrailers of different specifications are met. The container locks are of an overturnable structure, and the transportation requirements of containers of different models can be met.

The invention relates to a long steel rail transport vehicle set capable of rapidly unloading steel rails, which is characterized by comprising an unloading operation vehicle, wherein the unloading operation vehicle is provided with a steel rail unloading device; the steel rail unloading device comprises a winding device for pulling and unloading the steel rails and a pusher for pushing the steelrails; tracks are controlled by a guiding device, a tracking device and a lifting rail door at the time of unloading the steel rails; and the winding device, the pusher, the guiding device, the tracking device, the lifting rail door are fixed on the unloading operation vehicle body in sequence along with the running direction. The long steel rail transport vehicle set is formed by grouping six types of vehicles which are successively hung in serials, namely an unloading operation vehicle, a rail transporting heading vehicle, front rail transporting vehicles, a locking vehicle I, a locking vehicle II, rear rail transporting vehicles, and a rail transporting tail vehicle, wherein the number of the front rail transporting vehicles and the rear rail transporting vehicles depends on length of the transported steel rails. The long steel rail transport vehicle set has the advantages of large carrying capacity, simple structure, safety and reliability, high working efficiency of transporting and unloading the steel rails, and lower transportation cost.

The invention discloses a transportation recommendation method, system and equipment. The transportation recommendation method comprises the steps that a use request sent by a first terminal is received, and multiple sets of candidate transportation meeting a distance requirement are screened according to the position of a passenger and a preset dispatching range; first features of the passenger are acquired, and second features of each candidate transportation driver are acquired; the first features are matched with the second features of each candidate transportation driver, and a target driver is determined according to the feature matching degree of the passenger and each candidate transportation driver; and first response information is fed back to the first terminal, and second response information is sent to a second terminal corresponding to the target driver. In this way, target transportation is determined through flexible matching between the features of the passenger and the features of the drivers, therefore, the diversity of transportation recommendation modes is improved, and multi-aspect transportation demands of users are met.

The invention belongs to the technical field of transport planes and particularly relates to an unpiloted monorail transport plane. The entire unpiloted monorail transport plane mainly comprises a gasoline engine, a transmission device, a driving system, a striking linkage clutch brake device, a main rack, driving wheels, driven wheels, clamping wheels, a toothed monorail, a trailer and the like and is characterized in that the gasoline engine is used for providing power, the transport plane travels on the monorail, the monorail is composed of a piece of square steel, a toothed structure is laid on the monorail, and the striking linkage clutch brake device is arranged between the transport plane and the monorail. The unpiloted monorail transport plane can climb up a mountain slope with a gradient less than or equal to 40 degrees with a load of 500 kg and smoothly go down a slope with a load of 1000 kg, and has the minimum turning radius less than 3 m; being unpiloted and capable of selecting any point along the monorail to stop, and the unpiloted monorail transport plane can be used for transporting fruits, pesticides, fertilizers and the like in hillside orchards.

The invention discloses a device for arranging and binding packaging boxes automatically. The device mainly comprises a rack, a binding machine, a stopping mechanism for stopping the packaging boxes from being delivered continuously, a translation mechanism for moving and arranging the packaging boxes laterally and an anti-falling mechanism for preventing the packaging boxes from falling. A delivery mechanism is arranged on the rack, and the binding machine is arranged at the tail end of the delivery mechanism. The translation mechanism, the stopping mechanism and the binding machine are arranged along the delivery direction of the delivery mechanism successively. Compared with prior equipment, the device has the advantages that the structure is simple, the cost is low, the packaging boxes can be advanced stably, stopped at fixed points and arranged in groups, the plate product packaging quality can be guaranteed, production and transportation requirements can be met, the cost can be saved, and the production efficiency can be improved.

The present disclosure describes system and methods for network planning. The systems and methods can incorporate network traffic demands, availability requirements, latency, physical infrastructure and networking device capability, and detailed cost structures to calculate a network design with minimum or reduced cost compared to conventional methods. In some implementations, the method include providing an initial, deterministic set of failures, and then successively performing a network optimization and a network availability simulation to determine which failures most impact the performance of the network model. The high impact failures can then be provided back into the system, which generates an improved network design while still maintaining minimum cost.

The invention provides a comprehensive integrated optimization design method for a pure electric bus network, and the method comprises the steps: formulating a comprehensive integrated optimization design framework for the pure electric bus network from the perspective of global optimization, and achieving the comprehensive design scheme of the layout planning of the bus network, the setting of departure frequency and the site selection of a charging station; starting from the perspective of bus network operators, systematically analyzing the operation process of the pure electric bus network,extracting main operation cost involved in the method, establishing a pure electric bus network comprehensive integrated optimization design model taking minimum total operation cost as a design target on the basis of the main operation cost, reducing financial burden of a government by effectively controlling the operation cost, and effectively meeting carrying requirements of regional bus passenger flow; and constructing a new model calculation method on the basis of an artificial fish swarm intelligent algorithm framework to provide a more efficient solving thought for solving the problemof the optimal design of an actual-scale urban pure electric bus network.

The invention discloses a crawler transporter with an automatic loading and unloading function. The crawler transporter with the automatic loading and unloading function comprises crawler beams, a transporter frame, a rotating platform, a lazy arm, a power box, a pitching oil cylinder, crawler beam brackets and transport boxes, wherein the transport boxes are split type transport boxes, and the two transport boxes are independently arranged on the left side and the right side correspondingly; the crawler beam brackets are mounted on the crawler beams, and the two transport boxes are mounted on the left crawler beam bracket and the right crawler beam bracket correspondingly; and one end of the transporter frame is connected with the power box, and the other end of the transporter frame is in lap joint with the crawler beams. The distance between the two crawler beams is changed by changing the lap joint lengths of the transporter frame and the crawler beams, and thus crawler chassis are made to stretch and retract to achieve rail changing; and the rotating platform is arranged on the power box, the lazy arm and the pitching oil cylinder are mounted on the rotating platform, and the telescopic end of the pitching oil cylinder is hinged to the middle of the lazy arm, so that pitching of the lazy arm is achieved, and the lazy arm is driven by the rotating platform to rotate. The requirement for complete machine transportation and the requirement for the stability of a complete machine under different transportation width conditions are met; and the center-of-gravity position of the complete machine can be adjusted through rail changing in the hoisting process, and thus the stability of the complete machine is improved.

The invention discloses an intelligent warehouse type express parcel delivery method, belonging to the field of express parcel delivery. The method comprises the following steps of (S1) intelligent storage: carrying out information collection on an express parcel in an express parcel transfer station and loading the express parcel into a combined mobile self-service pick-up container, (S2) express parcel vehicle transportation: lifting the combined mobile self-service pick-up container into a vehicle, and then delivering the combined mobile self-service pick-up container to a delivery destination by an express parcel distribution vehicle, and (S3) self-service pick-up: after the express parcel distribution vehicle arrives the delivery destination, unloading the combined mobile self-service pick-up container, starting a central control module, allowing the central control module to emit a command to a storage module when the mobile phone number and a pick-up verification code inputted by a client are in accordance with the information in the database of the central control module, and opening a corresponding storage module cell door. According to the method, the waste of a large space by a small express parcel is reduced, the storage ability of the pick-up container is improved, the pick-up is efficient and accurate, the full-process digital monitoring and management are realized, and the method has potential advantages in dispute solution, information collection and service level improvement.

The invention discloses a scheduling method, a scheduling system and a device with a storage function. The scheduling method comprises the following steps: receiving a taxi calling request sent by a user terminal, wherein the taxi calling request comprises the position of the user terminal; according to the distance between the position of the user terminal and the position of the at least one transport vehicle, selecting a designated transport vehicle of the taxi calling request from the at least one transport vehicle; planning at least one first driving path by taking the position of the user terminal as an end point and taking the position of the designated transport vehicle as a starting point; and sending the first driving instruction containing the at least one first driving path toa designated transport vehicle, so that the designated transport vehicle drives to the position of the user terminal according to the at least one first driving path. In this way, the scheduling flexibility can be improved.

The invention relates to the technical field of unmanned aerial vehicles, in particular to a combination type transportation unmanned aerial vehicle. The combination type transportation unmanned aerial vehicle has the characteristics that the combination type transportation unmanned aerial vehicle comprises a plurality of modularized unmanned aerial vehicles, an unmanned aerial vehicle mounting platform and mounting interfaces; each modularized unmanned aerial vehicle consists of an unmanned aerial vehicle main body and an unmanned aerial vehicle mounting tenon; each unmanned aerial vehicle main body is fixedly mounted on the unmanned aerial vehicle mounting platform through the corresponding unmanned aerial vehicle mounting tenon and the corresponding mounting interface; the unmanned aerial vehicle mounting platform consists of an unmanned aerial vehicle mounting frame, undercarriages, cargo hanging frames, a central controller and a power / data transmission lines; the central controller, the cargo hanging frames and the undercarriages are arranged below the unmanned aerial vehicle mounting frame; the plurality of modularized unmanned aerial vehicles are connected with one anotherthrough the power / data transmission lines and are connected with the central controller. By changing the number and layout of the combined unmanned aerial vehicles, the transportation requirement of different volume mass loads can be met, and the load range of a transportation unmanned aerial vehicle is expanded; the cruising capacity is enhanced; rapid disassembling and assembling of unmanned aerial vehicle modules is realized; the safety and the adaptability of the unmanned aerial vehicle are enhanced.

The invention discloses an assembly base used on an automobile seat assembling line. The assembly base comprises a base plate arranged on a conveyer chain of the assembling line, a supporting plate which is arranged on the base plate and capable of rotating around the base plate, and a supporting rail, wherein a locking pin matched with a positioning hole in the base plate is arranged on the supporting plate, a supporting base supported by one end of the supporting rail is arranged on the supporting plate, and the other end of the supporting rail is connected with a cross bar; supports in rotary connection with the cross bar are arranged at the two ends of the cross bar, and the cross bar is connected with the supports through bearings installed on the supports; a sliding plate is connected to the bottom end of each support, a sliding block connected with a guide rod arranged on the supporting plate is arranged at the bottom end of each sliding plate, and supporting frames connected with the supporting plate are arranged at the two ends of the guide rod; the supporting base is connected with the supporting rail through an angle adjusting mechanism. The assembly base can meet assembly requirements of different stations, and assembly efficiency can be improved.

The invention relates to the technical field of rail transit. The invention further discloses an active height adjusting device for rail transit. The device comprises a base; a fixed cylinder is fixedly mounted on the upper surface of the base; a threaded rod is movably inserted into the fixed cylinder; the top end of the threaded rod penetrates through a cylinder opening of the fixed cylinder andextends upwards; sliding grooves are symmetrically formed in the inner wall of the fixed cylinder. Sliding blocks are symmetrically and fixedly connected to the rod wall, close to the bottom end, ofthe threaded rod. The sliding block is in sliding connection with the sliding groove; a supporting column is fixedly connected to the top end of the threaded rod, a traffic signal lamp body is fixedlyinstalled at one end of the supporting column, a threaded sleeve is rotationally connected to the edge of a top cylinder opening of the fixed cylinder through a bearing and is in threaded connectionwith the threaded rod, and a matched driven chain wheel rotationally sleeves the position, close to the bottom end, of the fixed cylinder. Active height lifting adjustment of the rail traffic signal lamp can be conveniently carried out according to needs, and the rail traffic requirements are met.

The present disclosure describes system and methods for network planning. The systems and methods can incorporate network traffic demands, availability requirements, latency, physical infrastructure and networking device capability, and detailed cost structures to calculate a network design with minimum or reduced cost compared to conventional methods. In some implementations, the method include providing an initial, deterministic set of failures, and then successively performing a network optimization and a network availability simulation to determine which failures most impact the performance of the network model. The high impact failures can then be provided back into the system, which generates an improved network design while still maintaining minimum cost.

The invention discloses a production method of a nanometer titanium dioxide-based superhydrophobic composite corrugated carton. According to the production method, firstly, a multi-layer film is constructed on the surface of kraft pulp fiber with a layer-by-layer self-assembly method by using chitosan and modified nanometer titanium dioxide respectively; as the number of layers increases, chitosan / nanometer titanium dioxide powder is also increased on the surface of the kraft fiber, and paper fiber is gradually covered by the modified titanium dioxide; due to the modification, the paper fiberis endowed with good hydrophobicity, and an contact angle with water is gradually increased; kraft paper with a superhydrophobic surface can be obtained by a conventional papermaking technology and high-temperature heat treatment; the kraft paper and ultrathin calendered kraft paper are bonded by using molten polyethylene, not only is a bonding effect achieved, two layers of the kraft paper are combined, and more importantly, a bonding agent forms a film, so that the waterproof, moisture-proof and barrier properties, the puncture strength, the burst strength and the like of composite surface paper are further improved.

The invention discloses a three-layer flexible sleeve expandable antenna, which is composed of an antenna sleeve, a driving mechanism, a push-and-pull mechanism and a positioning mechanism, wherein the driving mechanism drives the push-and-pull mechanism, so that the antenna sleeve is unfolded and retracted, and the positioning mechanism plays a role in positioning and locking after the sleeve isunfolded; the outer layer sleeve, the middle layer sleeve and the inner layer sleeve of the antenna sleeve are of a three-layer nested cable net structure, wherein the inner layer sleeve is an antenna, and the middle layer sleeve and the outer layer sleeve are of a supporting structure; the outer layer sleeve supports the middle layer sleeve, the middle layer sleeve supports the inner layer sleeve, and the outer layer sleeve, the middle layer sleeve and the inner layer sleeve are sequentially stretched and unfolded; the driving mechanism adopts an axial spiral movement mode and can move in thesleeve, so that the extension length of the sleeve antenna is increased; the push-and-pull mechanism enables the antenna to be retracted after being unfolded; the positioning mechanism enables the relative positions among the multiple layers of sleeves be accurately locked without relative movement, and vibration is reduced. The sleeve expandable antenna has the characteristics of being light inweight, high in unfolding precision, large in antenna stretching and unfolding length and convenient to recycle.

The invention discloses a transportation vehicle for pipeline processing, which comprises a base and a bracket. A storage box is arranged inside the bracket. The left and right sides of the storage box are connected to the bracket through rotating shafts. There are several placement slots, and there are pressure plates in the placement slots. There are several sliding chambers corresponding to the placement slots in the limit plate. There are threaded rods inside the sliding chambers. The left end of the threaded rods protrudes from the placement box. The left end is provided with an adjustment wheel, and a number of slide rods are provided on the threaded rod. One end of the slide rod is connected with the pressure plate. There is a chute for the slide rod to slide between the slide cavity and the placement groove. The left end of the dust chamber is provided with an air outlet, the air outlet is provided with a fan, the lower right part of the dust chamber is provided with a dust suction pipe, and the lower end of the dust suction pipe is provided with a dust suction cover. The invention has the advantages of simple structure, convenient use, convenient transportation, wide application range, and can clean the ground.

The invention discloses a novel tower material transportation engineering truck. The novel tower material transportation engineering truck comprises a traction frame, a tower material, cable lockers, a slope platform, a frame, hydraulic cylinders, cable fixing holes, support racks, mounting sleeves and a lifting platform, wherein the traction frame is mounted at the front end of the frame through pins, and the tower material is fixedly mounted on the lifting platform through the cable lockers; the slope platform is mounted at the rear end of the frame through a hydraulic rod, and the lifting platform is mounted on the frame through the hydraulic cylinders; the cable fixing holes are formed in the lifting platform, and the support racks are welded onto the frame; the mounting sleeves are welded on two sides of the lifting platform. The novel tower material transportation engineering truck has the advantages that the tower material is fastened by rotating the cable lockers, and the inclination angle of the slope platform can be adjusted through the hydraulic rod so as to conveniently load and convey goods; retaining rods are mounted in the mounting sleeves and used for fixing the goods; the cable fixing holes are used for fixing tower material cables; the frame adjusts the height of the lifting platform by adjusting the hydraulic cylinders; the support racks can stabilize the frame; the whole truck has eight wheels and is huge in load capacity and capable of satisfying tower material transportation requirements during iron tower construction.

The invention provides an engine accessory transmission assembly transporter. The engine accessory transmission assembly transporter comprises a chassis and a top plate, wherein the chassis is connected with the top plate through supporting columns; a plurality of transmission assembly mounting seats are arranged on the top plate; a transmission shell component storage region and a part storage box are both arranged on the chassis; and the transmission shell component storage region consists of side plates, end plates and a partition which are arranged on the chassis in a separated manner. Main components in engine accessory transmission assemblies such as a main fuel pump, a stress application fuel pump, a booster pump and a generator are rapidly fixed onto the top surface of the top plate of a transport cart by the mounting seats and hoops, meanwhile, other assemblies are arranged on the separation region and the part storage box of the chassis of the transport cart, and therefore transportation requirements of the engine accessory transmission assemblies are met efficiently and reliably. The engine accessory transmission assemblies are clear and free of errors when distributed and mounted, so that assembling quality of the engine accessory transmission assemblies is greatly improved.

The invention discloses a novel ground vehicle device for carrying ammunitions for fighters, particularly relates to an aviation ammunition carrier loader with a large carrying capacity, and is developed to overcome the defects that an active-duty ground ammunition carrier is heavy, slow in ammunition hanging speed and large in personnel demand and the like. Designs such as front axle steering, a concave chassis, an aviation bomb placing rack, rolling wheels and a constraining mechanism are utilized in the aviation ammunition carrier loader with the large carrying capacity, the aviation ammunition carrier loader with the large carrying capacity can be used in a single mode and a plurality of aviation ammunition carrier loaders can be also towed for being used simultaneously, so that single-time ammunition carrying quantity can be greatly improved. The aviation ammunition carrier loader with the large carrying capacity allows conventional aviation ammunitions to be transported and stored without ammunition cages, after the ammunitions are transported to an airport, an ammunition hanging device can be used for directly hanging ammunitions on a fighter, the ammunition hanging time is greatly shorted, and the number of occupied operators is reduced.

The invention provides a wireless smart electric transport cart platform for the facility agriculture. The wireless smart electric transport cart platform comprises a track, a cart body, a remote control system and a position marking and recognition system. The cart body comprises a frame and a travelling mechanism. Two ends of the frame are connected with guide wheels used for direction guide through guide wheel stands, and the guide wheels are matched with the track. The travelling mechanism is provided with an axle, drive wheels, a drive motor and a differential mechanism. The remote control system comprises a remote controller and a control cabinet arranged on the frame. The remote controller comprises a remote control transmitter. The control cabinet comprises a remote control receiver and a control unit which is electrically connected with the drive motor and the remote control receiver. The position marking and recognition system comprises a plurality of radio frequency transmitters, receiving antennas and radio frequency receivers, wherein the receiving antennas are connected with the radio frequency receivers, and the radio frequency receivers are electrically connected with the control unit.

In transmission process, mass traffic flow data passing through processes of signal detection, transmission, modulation and demodulation reaches to traffic management center. Thus, noise is included in data of signal. Wavelet technique is applied to integration of traffic flow data in order to eliminate noise, raise accuracy of data, and analyze a specific frequency component. The disclosed method is capable of processing mass data quickly, and calculating efficiency is much higher than traditional integration method of mathematical statistics. Features are: saving calculation time, raising integrated efficiency and accuracy, meeting requirement of traffic in present and in future.

The invention discloses a scheme for designing a plane T-shaped intersection through main road lane changing, relates to a traffic organization design and traffic control method and belongs to the field of traffic design and traffic control. According to the traffic organization design and traffic control method, the intersection capacity is improved and intersection delay is reduced; meanwhile, safety of pedestrians and non-motor vehicles is improved. According to the method, intersecting lane changing is carried out on a main road in the intersection through main road intersecting, and straight and left turning conflict points are moved outwards; the left turning traffic volume is free of delay within the range of the intersection. Meanwhile, original three-phase control is changed into two-phase control, and the period of signal timing is greatly reduced. The signal and coordination control over the two conflict positions can be easily implemented, and green wave traffic is achieved. The demanded quantity of left turning of a primary road and branch roads and smooth road passage can be achieved.

The invention provides a U-shaped tunnel-crossing beam transporting vehicle with an adjustable wheel track and a beam-feeding method of the U-shaped tunnel-crossing beam transporting vehicle. The beamtransporting vehicle at least comprises a vehicle body, traveling wheel sets and a beam carrying trolley; the vehicle body comprises a middle beam located in the middle and two side beams located onthe two sides; a plurality of cross beams are arranged in the longitudinal direction of the middle beam in a penetrating mode at intervals; the two ends of the outer sides of the multiple cross beamsare connected to the lower ends of the side beams correspondingly, so that the U-shaped structure of the vehicle body is formed; the traveling wheel sets are located at the lower ends of the side beams of the vehicle body and detachably connected with the side beams of the vehicle body, and the lower ends of the side beams are provided with two supporting positions of the traveling wheel sets; andthe beam carrying trolley comprises a front beam carrying trolley body and a rear beam carrying trolley body which are detachably connected. Therefore, according to the U-shaped tunnel-crossing beamtransporting vehicle with the adjustable wheel track and the beam-feeding method of the U-shaped tunnel-crossing beam transporting vehicle, the space below the flanges of box girders is utilized to the greatest extent, the transporting height is decreased, the transporting requirement of the large-span large-tonnage box girders can be met, especially the requirements for tunnel-crossing transporting of the box girders can be achieved, the forward travelling range of the front trolley body is further expanded, and longitudinal stability when a front cart of a bridge erecting machine takes the girders is improved.