45results about How to "Reduce additional force" patented technology

The invention discloses a spatial six-degree-of-freedom vibration measuring and damping vibration attenuating method. The method comprises the following steps of: 1) erecting six-displacement-sensor parallel measuring and damping vibration attenuating mechanism; 2) fixing a detected motion object and a fixed platform; 3) obtaining a motion variation rule by using an expansion variation displacement time of an expansion pull rod, and obtaining a vibration rule of the detected motion object by using a measurement algorithm with a positive solution; 4) obtaining a damping value of a six-degree-of-freedom controllable damper required by the vibration by using a damping vibration attenuating algorithm; and 5) adjusting the damping value of the six-degree-of-freedom controllable damper to a value obtained by the damping vibration attenuating algorithm. According to the invention, six-degree-of-freedom measurements of three vibration displacements and three vibration angles of the motion object at the same measurement point are achieved by using one set of mechanism; meanwhile, the vibration control of the motion object can be achieved; and the spatial six-degree-of-freedom vibration measuring and damping vibration attenuating method disclosed by the invention has the advantages of high accuracy, simple structure, good flexibility, strong adaptability, wide application range and the like.

The invention discloses a variable pressure angle cam contour line design method applicable to sudden variable load. R1 refers to the radius of a base circle omicron, R2 refers to the farthest dwell arc radius, AB arc refers to a cam contour line with the radius of R3, and alpha refers to a theoretical working curve pressure angle. When the normal values R1 and R2 are given, a graph of relation between a lift range h and the pressure angle alpha can be determined under different R3 values. An optimal arc radius value R3 corresponding to the pressure angle alpha changed along with the lift range h under sudden variable load can be found through the graph. The variable pressure angle cam contour line design method applicable to sudden variable load has the advantages that the pressure angle is extremely small in an open stage of a main valve core during opening of a cam and matched with characteristics of loads, and additional force applied to a top rod can be decreased.

The invention discloses a design method for crack control crack of an overlong concrete frame structure, concretely comprising the following steps of: determining the value of a comprehensive calculation temperature difference sigma delta t: determining the value of a season temperature difference delta t1 and determining the value of an equivalent temperature difference delta t2 of the contraction distortion of the concrete; calculating the additional elastoplasticity force of the concrete frame: introducing the elastoplasticity rigidity reduction coefficient beta' and determining the upper and lower limits of beta', calculating the elastoplasticity sideway movement resisting rigidity of an intermediate column of the frame, calculating the column top shearing force value of an intermediate column in the frame column line, and calculating the column top shearing force value Vn0 of an (n) column on the end part of the frame; and designing and rechecking the sections of the beam and column of the overlong frame: designing the section of the frame beam and rechecking the frame column. The design method has simple solving process and simple and clear design process, and cannot only save materials, but also can control the width of the crack in a maximal crack width limitate value, thereby bringing convenience to the design and the construction.

The invention relates to a construction method of a small-clear-distance laminated tunnel. The construction method comprises the following steps that a to-be-constructed lower layer tunnel and a to-be-constructed upper layer tunnel are subjected to in-advance support; the area, close to the upper layer tunnel, in the lower layer tunnel is excavated to form a first area, and corresponding construction of primary lining is conducted; a pilot tunnel is excavated at the position, opposite to the first area, inside the upper layer tunnel, and subjected to primary lining; a reinforcing device for sandwiched rock between the upper layer tunnel and the lower layer tunnel is constructed in the pilot tunnel; the rest part of the lower layer tunnel is excavated to subjected to corresponding construction of primary lining, and the lower layer tunnel is subjected to secondary lining construction; and the rest part of the upper layer tunnel is excavated and subjected to subsequent construction. According to the construction method, the pilot tunnel is arranged on the upper layer tunnel to enable a vibration wave to be propagated in air so as to reduce the influence of blasting of the upper layertunnel on a lower layer tunnel support structure and the sandwiched rock, mechanical equipment can be directly arranged in the pilot tunnel for operation, work such as sandwiched rock drilling is conducted from top to bottom, the problem that the small-clear-distance laminated tunnel is difficult to construct is solved, and thus the construction process is safer.

The invention discloses a multi-cable compounded damping cable. The technical key point lies in that the multi-cable compounded damping cable comprises a main cable and at least one secondary cable distributed around the main cable, and the at least one secondary cable is located on the upper portion of the main cable. The lower ends of the main cable and the secondary cables are connected with a concrete anchor fixed to the ground. The upper end of the main cable is connected with an upper anchoring end stand column fixedly connected with a structure through a main cable shock absorption device. The upper ends of the secondary cables are connected with the upper anchoring end stand column fixedly connected with the structure through a secondary cable shock absorption device. Hanging rods are arranged between the main cable and each secondary cable as well as between the secondary cables. According to the multi-cable compounded damping cable, the multi-cable compounded damping cable can be installed between two structures which are at a long distance and move relatively, and has the energy dissipation and shock absorption effects basically equal to those of a damper installed between two structures very close to each other.

A straddle type monorail transit track beam spherical steel support comprises an upper anchorage unit, tensile and compressive rotating mechanisms, a base, a bottom plate, a support horizontal adjusting mechanism and a lower anchorage unit; multiple tensile and compressive rotating mechanisms are arranged between the upper anchorage unit and the base; the lower anchorage unit is connected with thebottom plate at the upper part and the support horizontal adjusting mechanism; and the base capable of performing horizontal adjustment by using the support horizontal adjusting mechanism is arrangedon the upper surface of the bottom plate. According to the straddle type monorail transit track beam spherical steel support, the structure is simple, the operation is convenient, the loading and unloading are convenient, the size of a support is effectively reduced, the weight of the support is reduced, the cost can be preferably reduced, the application range is enlarged, better transverse anti-bending capacity is realized, the running safety is effctively guaranteed, the additional force to a bridge is smaller, and the straddle type monorail transit track beam spherical steel support is beneficial for guaranteeing the service life of the bridge.

The invention discloses a rolling bearing root part for a support hanger, comprising a foraminate welding slice, a trolley upper protective plate, a welding side slice, trolley guide rails, a pin shaft, a level bubble, a trolley guide rail end block, a trolley scale, a first inside assembly, a second inside assembly, a cart upper protective plate, a cart fastening screw, cart rails, a rolling ball guide groove, a cart guide rail end block and a cart scale, wherein the first inside assembly is inlaid in the trolley guide rails through a rolling ball interface thereof, the second inside assembly is inlaid in the cart rails through a rolling ball interface thereof, the level bubble and the scale are arranged at the lower end of each trolley guide rail, and the scale is arranged at the lower end of each cart rail. The invention has the advantages that the rolling bearing root part for the support hanger has little frictional resistance coefficient to greatly reduce additional force of the support hanger to piping thermal expansion, can mark two dimensional displacement, can enhance the safety of running of piping equipment, enable the equipment running to be more stable, reduces the maintenance time, prolongs the service life, enhances the comprehensive benefit of construction, and can be widely applied to industries such as the power industry, the petrochemical industry, the metallurgical industry and the like.

The invention discloses a saddle structure with a cable twisting limiting function. The structure comprises a transition saddle, a limiting swing arm and a first cable separation assembly, the transition saddle and the limiting swing arm are hinged to the two ends of the limiting swing arm respectively, so the first cable separation assembly swings only in the vertical direction. The transition saddle comprises a support and a cable bridge used for carrying a cable, the support is installed on a tower drum, the limiting swing arm is hinged to the support, and a plurality of branching holes areformed in the first cable separation assembly. The suspension cable is isolated and clamped by the cable separation assembly, so that the cables are prevented from being wound and collided during yawing, and damage and electric leakage caused by mutual friction of cable sheaths are avoided. When the cable is arranged, a three-phase one-group arrangement mode is adopted, electromagnetic interference is reduced, current transmission quality is ensured, the limiting swing arm ensures that the cable only moves up and down and does not twist or swing, and stress of the cable is effectively reducedwhile abrasion of the cable is further avoided.

The invention belongs to the technical field of mechanical engineering, in particular discloses an anti-rotation device of a rotary joint, mainly comprising a rotary joint outer sleeve M and a rotary joint spindle N. A fixed plate is fixedly connected with the rotary joint outer sleeve M, one end of a connecting rod is hinged on the fixed plate by a pin shaft, and the other end of the connecting rod is hinged on a crank by the pin shaft; one end of the crank is hinged on the connecting rod by the pin shaft, and the other end of the crank is fixedly connected with a torsion rod; both ends of the torsion rod are respectively sleeved in bracket holes; a bracket is connected with a support by bolts, and the support is fixed on a converter bearing seat bracket by bolts. The anti-rotation device of the rotary joint has compact structure, light weight, reliable and high-efficiency work, low operation cost, good safety performance and long service life, is in an ideal structural mode of preventing the rotation of the converter rotary joint, not only can be applied to a converter, but also can be widely applied to various similar mechanical equipment in other industries.

The invention discloses a space tumbling target non-contact racemization method based on a double-satellite electromagnetic formation satellite. According to the method, two small satellites carrying high-temperature superconducting coils are utilized to form an electromagnetic formation to reach the two sides of a non-cooperative target, and a space controllable magnetic field for enveloping the target is built; and the two service satellites continuously approach to and move away from the target by controlling the magnitude and direction of the current of the satellite-borne coils and the attitude of the formation satellites. The non-contact electromagnetic effect of the target and the coil system is achieved through eddy current torque induced by movement of a conductor on the target relative to a coil magnetic field, the angular momentum of the target is absorbed, and the angular momentum of the service satellite system is consumed at the farthest point through a propellant. The invention aims to solve the problem that capturing is difficult to implement due to complex rolling motion of the non-cooperative target.

Disclosed is a roll stand for edgers in rolling mills. Said roll stand is embodied in several pieces, comprising two crossheads (1a, 1b) and four longitudinal bars (4a, 4b) as main components (1) as well as one respective common cruciform (7) junction point (3) for the crosshead (1a, 1b) and the longitudinal bars (4a, 4b), which is located at the ends (6) of the longitudinal bars. Pretensioned through bolts (5) that act as a joint are used at least at the top ends (6) of the longitudinal bars.

The invention provides a TV set with a built-in loud speaker and capable of solving the problems of the prior art such as TV vibration and poor low-frequency response of a loud speaker. The invention adopts the following technical proposal: a clearance Delta 1 is arranged between a loud speaker and a loud speaker holder; a speaker frame is movably sleeved on the double-ended bolt of a casing; both the inside and the outside of the double-ended bolt are provided with stop blocks; the speaker frame is arranged between the inside stop block and the outside stop block with a clearance Delta 2 set aside. The TV set overcomes the technical prejudice of acoustic short circuit close connection and adopts a clearance structure form different from close connection, thereby solving the problems such as TV vibration and poor low-frequency response.

The invention provides a rotary translation piston compressor, belonging to the technical field of mechanical engineering. The rotary translation piston compressor solves the problem that the elasticity strength of a spring needed by an existing rotary translation piston compressor is high. The rotary translation piston compressor comprises an air cylinder, a crankshaft and blades, wherein a piston is sleeved on an eccentric part, and a plane part is arranged on the peripheral surface of the piston; springs are arranged between the blades and the air cylinder; the blades prop against the plane part on the peripheral surface of the piston, and the end surfaces of the blades, propping against the piston, are planes; the eccentric part and the piston are connected with each other through a friction reducing mechanism which can enable the end surfaces of the blades to always prop against the plane on the peripheral surface of the piston. Plane friction and plane sealing are adopted between the blades and the piston of the rotary translation piston compressor so as to enlarge the sealing surface, and improve the sealing property. Meanwhile, due to the plane sealing, a high-pressure refrigerant can not enter the parts between the blades and the piston easily, so that the additional force of the high-pressure refrigerant to the moving direction of the blades in the operation of the compressor is reduced.