44results about How to "Improve load bearing" patented technology

The invention relates to a chain cable securing device for a ship, which can be widely used for water drum mooring of the ship during defending against a hurricane. The chain cable securing device for the ship comprises a base and a manual opening and closing mechanism which is configured together with the base, wherein the manual opening and closing mechanism comprises a press cover with one end hinged with the base; an internal arc groove and an external arc groove are respectively formed inside and outside the press cover configured together with the base; the press cover is connected with a manual rocking bar by a connecting bar and the other end of the manual rocking bar is hinged with the base so that a double-rocking-bar type manual opening and closing mechanism; the manual rocking bar of the manual opening and closing mechanism is connected with a self-locking mechanism; and the self-locking mechanism is connected with a manual unlocking device. The chain cable securing device for the ship, provided by the invention has the advantages of compact and reasonable structure, high reliability, small appearance, light weight, high bearing load, strong hurricane defending mooring function, convenience in use, functions of rapidly clamping, automatically locking and rapidly unlocking hurricane defending chain cables and capability of being widely used for water drum mooring of the ship during defending against the hurricane.

The invention discloses a squirrel cage type elastic support with a rigid gradient. The squirrel cage type elastic support comprises a fixing ring and a cylindrical bearing installation ring with oneend fixedly connected with the fixing ring. Multiple through grooves are formed in the cylinder wall of the cylindrical bearing installation ring, and multiple variable-section cage bars which are evenly distributed are correspondingly formed. By means of the squirrel cage type elastic support, a second cage bar part with the smaller section area is adopted at the end away from the fixing ring, and a first cage bar part with the large section area is adopted at the end close to the fixing ring. The rigidity of the squirrel cage type elastic support is adjusted by adjusting the relative size ofthe section area of the two parts of cage bars, and therefore the critical rotating speed of a rotor system is adjusted; and meanwhile, the bearing load and the bending moment capability of the squirrel cage type elastic support are improved, the cage bars are not likely to be fractured, the fatigue strength reservation is improved, and the service life is prolonged.

The invention provides a spliced ​​steel structure truss, which includes a series shaft, an arc-shaped frame unit, a side support unit and a middle support unit; the invention can solve the problem of the poor stability of the main structure of the steel structure truss used in daily buildings, which needs to be adopted A large number of bolts are used to fix the adjacent steel rods. It is troublesome to remove the fixed trusses, and the fixed bolt holes are usually set according to the predetermined connection positions on the trusses of the steel structure, which can only bear the same range of loads and cannot pass through. Changing the overlapping position between the trusses to adjust the load-bearing load will cause the trusses to be limited in the actual use process and cannot meet the actual engineering construction needs and other problems.

A hydraulic system for controlling tension of a steel wire rope comprises a master reversing valve (2), a switching valve (3), a check valve (4), a backpressure valve (5), and a hydraulic motor (1). The master reversing valve (2) is used for leading hydraulic oil into or out of the hydraulic system; the hydraulic motor (1) is used for outputting power to a traction device of the steel wire rope; a first end of the switching valve (3) is in communication with a first oil outlet (A) of the master reversing valve (2), an inlet of the check valve (4), and an outlet of the backpressure valve (5); a second end of the switching valve (3) is in communication with a second oil outlet (B) of the master reversing valve (2) and a first end (B) of the hydraulic motor; and an inlet of the backpressure valve (5) is in communication with an outlet of the check valve (4) and a second end (A) of the hydraulic motor (1). The present invention provides a crane having the hydraulic system and a method for controlling tension of a steel wire rope. The system and the method can solve the problems in the prior art that a telescopic-boom crane with a super-lift winding mechanism has low stability and low work efficiency during stretching of a lifting boom.

The invention relates to improvement of the traditional steel bar concrete precast floor slab, which is characterized in that the upper surface layer and the lower surface layer of a precast concrete hollow floor slab are internally provided with a two-way steel bar framework, an upper and lower layer connecting steel bar concrete ribs consisting of a vertical steel bar connecting steel bars of the upper surface layer and the lower surface layer and wrapping concrete is arranged between the upper surface layer and the lower surface layer; heat insulation and sound insulation materials are filled between the two steel bar concrete ribs; two sides and two ends of the floor slab in an axial direction are both provided with connecting steel bars and side wings of the extending thickness less than the thickness of the floor slab; and shelf beams at two end parts of the floor slab are internally provided with transverse steel bar frameworks forming beam structures and anti-shearing diagonalsteel bars connecting the steel bars at the lower surface layer. The precast floor slab integrates the advantages of the precast floor slab and the cast-in-place floor slab, overcomes all defects of the precast floor slab and the cast-in-place floor slab, especially has small cast-in-place construction workload and high construction speed, can meet requirements of the construction for rapid operation, materials saving and no pollution in an assembled building, accords with the development direction of the building industrialization production, and has high earthquake resistance of the cast-in-place floor slab.