Multifunctional emergency rescue fire-fighting crane

The invention relates to a large-tonnage lorry-mounted crane which comprises a base, a lifting hook, an oil tank, a hydraulic control system, a support leg assembly, a swing mechanism, a first amplitude transformation mechanism, a second amplitude transformation mechanism and a telescopic arm assembly, wherein the support leg assembly comprises two horizontal telescopic support legs, two verticaltelescopic support legs and two turnover sliding plates; the swing mechanism comprises a swing hydraulic motor, a planet gear reducer, and a swing support with an inner ring fixed on the base; the first amplitude transformation mechanism comprises a main arm, a connecting rod I, a connecting rod II and a first amplitude transformation cylinder; the second amplitude transformation mechanism comprises a second amplitude transformation cylinder connected to the main arm, a connecting rod III and a connecting rod IV; the telescopic arm assembly comprises a fixed telescopic arm; multiple telescopic arms mutually sheathed together are sheathed on the fixed telescopic arm; and telescopic cylinders on each telescopic arm are arranged in a mutually staggered mode. The invention can realize the two-stage telescopic operation by adopting the horizontal support legs, enlarges the span distance among the support legs, enhances the bearing capability and strengthens the stability of the crane. The large-tonnage lorry-mounted crane provided by the invention has the advantages of simple structure, strong adaptability and lighter weight of the finished crane.

Large-tonnage lorry-mounted crane

The invention discloses a boom with a folding structure, which relates to the technical filed of mechanism booms, in particular to the technical filed of booms installed on vehicles and used for hoisting goods. The boom overcomes the technical deficiencies of large occupied space and low hoisting height of the existing boom, and comprises a base, a fixed arm, an intermediate arm and a telescopic folding arm; the bottom end of the fixed arm is fixedly installed on the base, and the top end is movably connected with the tail end of the intermediate arm through a first rotating shaft; the front end of the intermediate arm is movably connected with the tail end of the telescopic folding arm through a second rotating shaft; a first oil cylinder which jacks the intermediate arm and takes the first rotating shaft as a supporting point to upwards lift and turn is arranged between the fixed arm and the intermediate arm; and a second oil cylinder which jacks the telescopic folding arm and takes the second rotating shaft as a supporting point to upwards lift and turn is arranged between the intermediate arm and the telescopic folding arm. The intermediate arm and the telescopic folding arm can be folded and retracted, and the folding angle of the telescopic folding arm can reach 180 degrees, so that the boom reduces the occupied space, and is labor-saving and convenient for vehicle installation.

Boom with folding structure

This paper studies the dynamic response of a cantilevered beam subjected to a moving moment and torque, and combination of them with a moving force. The moving loads are considered to traverse alon...

Dynamic Response of a Cantilevered Beam Under Combined Moving Moment, Torque and Force

Vehicle detection and tracking based on video image processing in intelligent transportation system

The utility model relates to a heavy tonnage lorry-mounted crane which comprises a base, a hook, an oil tank, a hydraulic control system, an outrigger assembly, a slewing mechanism, a first luffing mechanism, a second luffing mechanism and a telescopic boom assembly. The outrigger assembly comprises two leveled telescopic outriggers, two vertical telescopic outriggers and two flipping sliding plates; the slewing mechanism comprises a slewing hydraulic motor, a planetary gear reducer, and a slewing bearing, wherein the inner ring of the slewing bearing is fixed on the base. The first luffing mechanism comprises a main boom, a connecting rod I, a connecting rod II and a first luffing oil cylinder. The second luffing mechanism comprises a second luffing oil cylinder connected on the main boom, a connecting rod III and a connecting rod IV. The telescopic boom assembly comprises a fixed telescopic boom, the fixed telescopic boom is sleeved with a plurality of mutual sleeved telescopic booms, and the telescopic oil cylinders of the telescopic boom are arranged at intervals in a stagger way. With the adoption of leveled outriggers, two-stage retraction can be realized, so that the space between the outriggers is enlarged, the ability of the bearing is increased, and the stability of the crane is improved. The heavy tonnage lorry-mounted crane is simple in structure, strong in adaptability and much lighter in weight.

Heavy tonnage lorry-mounted crane

The invention discloses a single cylinder synchronous expansion and contraction device with multiple sets of inhaul cables for a lorry-mounted crane. The device comprises a basic arm and a plurality of telescopic arms which are overlapped and sleeved in the basic arm; a telescopic oil cylinder of which the head is fixed on the tail of the basic arm and the barrel is fixed on a first section of the tail of the telescopic arm is arranged in each of the plurality of telescopic arms; the arm body of each telescopic arm is provided with a pulley, a telescopic arm cable, and a fixed plate; a rope row is arranged in each telescopic oil cylinder; and synchronous extending or contraction of multiple sections of the telescopic arms can be realized by the connection relationship of the parts, and the operation characteristics that the conventional arm can be only extended and contracted sequentially are changed to ensure that the multiple sections of the telescopic arm bodies are extended and contracted synchronously along with the extension and contraction of the inbuilt telescopic cylinders, so that the extension and contraction speed of the arm bodies and the efficiency of the lifting operation are improved greatly. The single cylinder synchronous expansion and contraction device with the multiple sets of inhaul cables for the lorry-mounted crane has a compact structure, the mode of winding steel wire ropes is skilful, the space in the arm body is fully utilized, and the problems that the conventional five-section telescopic arm expansion and contraction system for the lorry-mounted crane is implemented by arranging two inbuilt telescopic oil cylinders are solved.

Single cylinder synchronous expansion and contraction device with multiple sets of inhaul cables for lorry-mounted crane

Dynamic behaviors of the 2-DOF axially telescopic mechanism for truss structure bridge inspection vehicle is investigated. The telescopic mechanism is a combination of one vertical beam that can move axially, one constant beam perpendicularly fixed at the end of the vertical beam and one telescopic beam that can move along the axial direction of the constant beam during work. The Euler-Bernoulli beam theory is utilized to simplify the beams. The Lagrangian description is adopted to account for the coordinate for the telescopic mechanism. The equations of motion are derived using the Hamilton’s principle and decomposed into a set of ordinary differential equations by employing the Galerkin’s method. The eigenfunctions are acquired based on the boundary conditions by adopting the dichotomy method. The solutions to the equations are acquired using the Newmark-β method. Experiments are carried out to prove the validity of the theoretical model. Numerical examples are simulated to explore whether the vertical beam and telescopic beam can extend or retract synchronously and obtain appropriate beam moving strategy. The results prove that synchronous motion of the vertical beam and telescopic beam will not always lead to pronounced stronger vibration than the separate ones. On the other hand, the beam moving strategies that the telescopic beam moving before the vertical beam when they all extend out or retract back and moving after the vertical beam when one extends out and the other retracts back will effectively reduce the vibration compared with otherwise.

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Dynamic behaviors of 2-DOF axially telescopic mechanism for truss structure bridge inspection vehicle

Dynamic responses of a telescopic mechanism for truss structure bridge inspection vehicle under moving mass are investigated under the assumption of Euler-Bernoulli beam theory. Equations of motion for the telescopic mechanism are derived using the Hamilton’s principle. The equations are transformed into discretized equations by employing the Galerkin’s method. The eigenfunctions of the beams are derived based on the kinetic and dynamic boundary conditions. The time-dependent features of the eigenfunctions are taken into account. The discretized equations are solved utilizing the Newmark-β method. Numerical results are presented to explore the influence of the moving mass on the dynamic responses of the telescopic mechanism and find appropriate mass-moving strategy to avoid large vibration. The results show that the vibrations when the mass doesn’t move synchronously with the telescopic beam are not always the minimum; on the other hand, the mass moving in the same direction of the telescopic beam will bring in stronger vibration.

/pdf/dynamic-responses-of-axially-moving-telescopic-mechanism-for-4nvfaqlmnx.pdf

Wenwen Sui

Papers

Large-tonnage lorry-mounted crane

Heavy tonnage lorry-mounted crane

Single cylinder synchronous expansion and contraction device with multiple sets of inhaul cables for lorry-mounted crane

Dynamic behaviors of 2-DOF axially telescopic mechanism for truss structure bridge inspection vehicle

Dynamic responses of axially moving telescopic mechanism for truss structure bridge inspection vehicle under moving mass