51results about How to "Guaranteed connection stiffness" patented technology

The present invention discloses a construction method in which a steel box girder is hung on a girder bottom to be transported and is assembled by cantilevers. The construction method includes the following steps: a track is arranged on the bottom of a steel box girder; below the steel box girder, a hydraulic creeping formwork mechanism arranged under the steel box girder is utilized to transport a steel box girder to be assembled; and meanwhile, triangular hanging frames are adopted to change hanging points. The present invention provides the method for assembling the steel box girders of a low-cost bridge, which is generally used for the construction of bridges in wide and shallow rivers without navigation conditions and mountainous areas as well as the construction of bridges in rivers with ordinary navigation conditions, and the efficiency of the whole construction process is high.

The invention relates to a long-span multi-section combined truss roof structural system and a construction method thereof. The structural system comprises structural columns and a roof truss, whereinthe structural columns include middle columns and side columns; the roof truss comprises main trusses and secondary main trusses, the main trusses comprise side main trusses and side main trusses, the main trusses are formed by splicing main truss units, and the head end surface and tail end surface of the main truss units are oblique end surfaces and are parallel to each other; and column connecting brackets which used for connecting the roof truss and are adapted to components of the corresponding roof truss are arranged in node regions of the structural columns. According to the construction method, the roof truss and the structural columns are sectionally lifted by virtue of the cooperation with a temporary reinforcing measure. Under the condition that the construction stress is met,the structural system is improved, the construction procedure is optimized, the construction cost is saved, the mounting efficiency is improved, and the measure cost is saved.

The invention belongs to the technical field of control plane control of aircrafts, and particularly discloses an electric steering engine. A shell and an end cover form a cavity, a steering machine output shaft is arranged in the cavity and comprises a steel wheel and a first output shaft positioned in the steel wheel, the steel wheel is positioned in the end cover, one end of the first output shaft is positioned in the shell, the other end of the first output shaft is positioned in the end cover, a harmonic cam is sleeved between one end of the first output shaft and the steel wheel, an input rigid wheel is sleeved on the harmonic cam, a second bevel gear is also sleeved on the steel wheel, the side wall of the second bevel gear is in fit with the side wall of the harmonic cam, the second bevel gear is fixedly connected with the harmonic cam, a motor output shaft is positioned in the shell, the first bevel gear is sleeved outside the motor output shaft, the second bevel gear is meshed with the first bevel gear through a gear, and a potentiometer output shaft of a feedback potentiometer is nested in the first output shaft. According to the steering machine, the connection rigidity can be ensured when the flexible connection is realized, and the reliability of the steering machine and the dynamic response of a steering machine system are improved.

The invention relates to a fender mounting structure which comprises a front hub strengthening beam, a fender and a fender support. The fender support is positioned between the front hub strengthening beam and the fender, is connected with the front end of the front hub strengthening beam and is used for supporting the fender. The fender mounting structure is characterized by further comprising a headlamp transverse beam and a front upper component assembly; one end of the headlamp transverse beam is connected with the fender support, and the front upper component assembly is connected with the other end of the headlamp transverse beam. The fender mounting structure has the advantages that certain impact toughness can be guaranteed while the connection rigidity of the fender is guaranteed, injury to pedestrians after the pedestrians are knocked down by automobiles can be relieved, and the life safety of the pedestrians can be protected; connection errors in the vertical directions can be reduced, and accordingly appearance gaps of the automobiles can be guaranteed.

The invention discloses a passenger compartment shape retention device and an automobile provided with the same, relates to a passenger compartment shape retention device for protecting safety of passengers during collision of an automobile, and belongs to the field of safety devices of automobiles. The passenger compartment shape retention device comprises a front wall plate, an instrument board crossbeam and an additional support beam extending between the front wall plate and the instrument board crossbeam, and a joint of the additional support beam on the instrument board crossbeam is positioned between a steering column mounting support and a second end. The passenger compartment shape retention device is simple in structure, the additional support beam is connected with the instrument board crossbeam and the front wall plate, deformation of the additional support beam, the instrument board crossbeam and the front wall plate which are used as a combination during collision is controllable, and the additional support beam cannot be broken to cause excessively high maintenance expenditure. Besides, the additional support beam is arranged between the instrument board crossbeam and the front wall plate, and the integral collision resistance of the passenger compartment shape retention device is improved, so that rearward movement of the instrument board crossbeam and rearward movement of the front wall plate are effectively controlled, and injury to chests of passengers is relieved.

The invention discloses an unmanned aerial vehicle equipped with multiple protection devices and a control method thereof, and belongs to the technical field of unmanned aerial vehicles. The unmannedaerial vehicle equipped with the multiple protection devices includes a plurality of buffer energy absorbing devices, an airbag device and a parachute device. The connecting position of each rotor anda vehicle body is provided with the corresponding buffer energy absorbing devices, a number of buffer energy absorbing hollow structures are arranged in the buffer energy absorbing devices, the two ends of each buffer energy absorbing device are connected to the corresponding rotor and the vehicle body, and the buffer energy absorbing devices are allocated to generate deformation firstly when theunmanned aerial vehicle is impacted; the airbag device includes at least one airbag and an inflation structure, and the inflation structure is configured to inflate the airbag so as to expand the airbag and wrap task equipment of the unmanned aerial vehicle; and the parachute device includes at least one parachute bag and parachute opening structures, and the parachute opening structures are configured to launch the parachute bags. The unmanned aerial vehicle adopts the triple protection devices including the parachute device, the airbag device and the buffer energy absorbing devices, multiple-stage multi-aspect protection of the unmanned aerial vehicle is carried out, and the safety is high.

The invention provides an automobile power assembly suspension structure and belongs to the technical field of automobiles. The technical problem that an existing power assembly suspension structure can not consider the damping effect and the limiting effect of a power assembly is solved by the automobile power assembly suspension structure. According to the automobile power assembly suspension structure, an automobile comprises a power assembly and an auxiliary frame assembly; the suspension structure comprises a first installation support fixedly connected with the auxiliary frame assembly and a second installation support fixedly connected with the power assembly. A spiral damping spring is arranged between the first installation support and the second installation support. The suspension structure further comprises a limiting piece fixedly connected between the first installation support and the second installation support and arranged in a spiral through hole of the damping spring, so that the power assembly is only allowed to move in the axis direction of the damping spring. The automobile power assembly suspension structure has the advantages that the damping effect is good, the limiting effect between the power assembly and the auxiliary frame assembly is good, and service life is long.

The invention relates to a base-station housing body, in particular to an improvement to the chassis structure and to the connecting structure between the chassis and the upright posts in the base-station housing body. The chassis of the base-station housing body includes a bottom frame, as well as steel bottom plates and contour plates mounted face to face on the upper and lower sides of the bottom frame; the bottom frame includes two supporting beams arranged face to face and two bottom beams arranged face to face between the supporting beams; corner pieces for connecting the upright posts are arranged at the four corners on the upper surface of the bottom frame; upright post mounting holes are opened on both ends of the upper surface of each supporting beam; all upright posts are fixed at the corners of the chassis through the corner pieces and the upright post mounting poles. It can be seen that the upright posts can be conveniently mounted on the chassis through the corner pieces and the upright post mounting holes, thus ensuring the rigidity of the connection between the upright posts and the bottom frame at two horizontal directions; then wall panels can be quickly and conveniently installed on the upright posts.

The invention discloses a staggered connection process boss tool and a method for machining a workpiece. The boss tool comprises a process boss body and a workbench; a pressing hole is formed in the process boss body; a bolt penetrates through the pressing hole to fix the process boss body onto the workbench; the process boss body is connected with the workpiece through connecting pieces; the connecting pieces includes a high-position connecting block and a low-position connecting block; the high-position connecting block and the low-position connecting block are arranged in a staggered mannerin the transverse and longitudinal directions, and the appearance of the workpiece is pressed in the high position and the low position, so that the clamping stability is improved, and the connectingstrength and rigidity of a process boss can be guaranteed even if the area of connecting parts is reduced. A bench worker can break and polish the workpiece easily, and thus the working efficiency ishigh.

The invention discloses a vehicle body framework joint and a vehicle with the same. The vehicle body framework joint comprises a first sub-joint and a second sub-joint, wherein the first sub-joint andthe second sub-joint are suitable for being installed on a vehicle body framework, the first sub-joint and the second sub-joint are combined in an abutting mode and jointly define a cross beam connecting groove and a longitudinal beam connecting groove, the cross beam connecting groove is suitable for containing a cross beam of the vehicle body framework, and the longitudinal beam connecting groove is suitable for containing a longitudinal beam of the vehicle body framework. According to the embodiment of the invention, the vehicle body framework joint is high in connecting strength, convenient to assemble and high in assembling efficiency.

The invention relates to an interstage separation device suitable for small-diameter aircrafts. The device is jointly composed of a connecting and unlocking device and an impulse separating device, and can be widely applied to the small-diameter aircrafts such as multi-stage rocket projectiles and multi-stage target projectiles. When an aircraft flies, connection and separation of a boosting stage and an upper stage are achieved through the interstage separation device. The connecting and unlocking device mainly comprises an upper-stage connecting cabin, a lower-stage connecting cabin, an unlocking top disc, steel balls, explosive bolts, ball pads and locking nuts; and the impulse separating device is mainly a cylindrical spring. When the aircraft flies in a whole rocket mode, the upper-stage connecting cabin is connected with the upper stage in a fastened mode, and the lower-stage connecting cabin is connected with the boosting stage in a fastened mode. The unlocking top disc radially supports the six steel balls in an upper-stage connecting locking hole and a V-shaped groove of the lower-stage connecting cabin, so that inter-stage axial limiting is realized; and a shear pin on the upper-stage connecting cabin is inserted into a radial limiting groove of the lower-stage connecting cabin, and interstage radial limiting is achieved. After the aircraft completes boosting flight at the boosting stage, the explosive bolts are detonated and separated, the unlocking top disc moves forwards under the action of the cylindrical spring, the steel ball radial support is relieved, the steel balls fall into an unlocking top disc groove, and the aircraft completes stage unlocking; and the cylindrical spring pushes the unlocking top disc to drive the upper-stage connecting cabin to continuously move until the upper-stage connecting cabin and the lower-stage connecting cabin are separated, and the aircraft achieves reliable interstage separation.

The invention relates to the technical field of clamps, and discloses a convenient-to-mount-and-dismount bearing column vertical processing clamp. The clamp comprises a table top, wherein a footstandis fixedly connected to the bottom of the table top, a base is arranged at the top of the table top, the bottom of the base is fixedly connected with the table top through bolts, a vertical sliding groove is formed in the side face of the base, a top seat is fixedly installed on the side surface of the top of the base, a motor is fixedly connected to the bottom of the table top, and a first two-way threaded rod is fixedly connected to an output shaft of the motor. According to the convenient-to-mount-and-dismount bearing column vertical machining clamp, the first two-way threaded rod can be driven to rotate through operation of the motor, then a first clamping mechanism and a second clamping mechanism are driven to move, the distance can be adjusted, the clamp is suitable for bearing columns of different lengths or adjusting clamping points, the applicability is high, two clamping plates can be driven to move inwards at the same time by rotating a handle, clamping and fixing are achieved, and operation is convenient.

The invention discloses an ultrahigh-bearing-capacity large-diameter pipe pile and a fast pile sinking and secondary grouting method. The pipe pile is provided with a pair of symmetric hole ways in the vertical direction. A grouting device is fixed to the pile end of the pipe pile and comprises an upper end plate, a middle end plate and a lower end plate. The upper end plate is provided with a pair of vertically-through round through holes, and the round through holes are in one-to-one correspondence to the hole ways. The outer side of the middle end plate and the outer side of the upper end plate are fixedly connected in a seamless manner to form a hollow cavity. A pipeline is arranged in the middle end plate. One end of the pipeline is in seamless connection with one round through hole, and the other end of the pipeline is located over the lower end plate. An elastic sealing ring is arranged between the lower end plate and the middle end plate in a seamless manner and comprises multiple sealing pads attached in a seamless manner. Multiple holes distributed evenly and symmetrically are formed in the open face between the outer edge of the lower end plate and the outer edge of the middle end plate. The hole way connected with the pipeline is used for a secondary grouting hole of pile sinking, and the other hole way is used for a water jet hole and a primary grouting hole. According to the ultrahigh-bearing-capacity large-diameter pipe pile and the fast pile sinking and secondary grouting method, water jet and grouting integration of the large-diameter pipe pile can be achieved, and the pipe pile has the ultrahigh bearing capacity after grouting.

The invention discloses a passenger compartment shape retention device and an automobile provided with the same, relates to a passenger compartment shape retention device for protecting safety of passengers during collision of an automobile, and belongs to the field of safety devices of automobiles. The passenger compartment shape retention device comprises a front wall plate, an instrument board crossbeam and an additional support beam extending between the front wall plate and the instrument board crossbeam, and a joint of the additional support beam on the instrument board crossbeam is positioned between a steering column mounting support and a second end. The passenger compartment shape retention device is simple in structure, the additional support beam is connected with the instrument board crossbeam and the front wall plate, deformation of the additional support beam, the instrument board crossbeam and the front wall plate which are used as a combination during collision is controllable, and the additional support beam cannot be broken to cause excessively high maintenance expenditure. Besides, the additional support beam is arranged between the instrument board crossbeam and the front wall plate, and the integral collision resistance of the passenger compartment shape retention device is improved, so that rearward movement of the instrument board crossbeam and rearward movement of the front wall plate are effectively controlled, and injury to chests of passengers is relieved.