42results about How to "Slow down scaling" patented technology

The invention belongs to the technical field of hydraulic equipment, and specifically discloses a two-way quick hydraulic cylinder. The two-way quick hydraulic cylinder comprises a cylinder barrel, apiston and a piston rod, wherein a sleeve is arranged at the outer side of the cylinder barrel; one end of the cylinder barrel is connected with a pushing rod; the other end of the cylinder barrel isconnected with a sealing disc; the sealing disc is in sliding and sealing connection with the sleeve; a plurality of oil conducting holes are formed in the sealing disc; one end of the sleeve is connected with a bottom disc; a plurality of first elastic pieces are connected on the bottom disc of the sealing disc; a central hole is formed in the shaft center of the bottom disc; the piston rod is fixedly connected with the bottom disc through the central hole; one end, connected with the pushing rod, of the cylinder barrel is in sliding and sealing connection with a fixed ring; the piston rod isin sliding and sealing connection with the central hole of the bottom disc; an oil outlet hole is formed in the cylinder barrel; and a through oil inlet hole is formed in the piston rod in the axialdirection. The two-way quick hydraulic cylinder is mainly used on hydraulic equipment, and solves the problem that telescopic length is inaccurate as a result of high telescopic speed at the last telescopic stage of the hydraulic cylinder.

The invention discloses a polycrystalline diamond hard alloy composite sheet with high impact resistance and toughness, which comprises a cemented carbide substrate and a diamond composite layer. The thermal expansion coefficient and elastic modulus coefficient of the block are between the thermal expansion coefficient and elastic modulus coefficient of the diamond material constituting the diamond composite layer and the cemented carbide material constituting the cemented carbide matrix; It is composed of two or more mixtures of metals of transition elements and their carbides, nitrides, carbonitrides and diamond powder. The polycrystalline diamond cemented carbide composite sheet with high impact resistance and toughness proposed by the present invention reduces the influence of the high temperature and high pressure sintering process on the overall performance of the cemented carbide substrate, and at the same time reduces the internal residual stress of the composite sheet and improves the overall impact resistance of the composite sheet toughness.

The invention discloses a design and construction method of a risk-relief and reinforcement measure for suppressing embankment foundation piping. A barrier structure is arranged inside the embankment foundation on the backwater side, which is used to suppress the generation and expansion of concentrated seepage channels inside the embankment foundation; wherein, For the single-layer embankment, the barrier structure is arranged at the foot of the backwater side; for the double-layer embankment and the multi-layer embankment, the barrier structure is arranged at the impermeable covering layer and its lower layer Between the above-mentioned strong water-permeable layers, the barrier structure is located on the water-facing side of the weak part of the weakly-permeable covering layer on the backwater side; the material of the barrier structure ensures that it has sufficient water permeability and can effectively prevent the strong water-permeable layer. Particle loss in the soil; the material particle size of the barrier structure is determined by calculation; the barrier structure is ecological and environmentally friendly, and the cost is low; the construction is convenient and the reinforcement effect is good.

The invention discloses a method for controlling the rising velocity of a movable arm of an excavator, a control system for realizing the method and an excavator containing the control system. The control system comprises an engine, a first hydraulic pump, a second hydraulic pump, a movable arm oil cylinder, a main control valve, an operating handle, a controller and a plurality of detecting devices. The movable arm is provided with a limit position detecting zone. The controller judges whether the movable arm rises to the limit position detecting zone according to signals fed back from the detecting devices, calculates and outputs a control signal to the first hydraulic pump, adjusts the output power of the first hydraulic pump in time, and reduces the stretching velocity of the movable arm oil cylinder until the action terminal velocity is zero so as to effectively realize the buffer function, increase the service life of the movable arm oil cylinder and enhance the reliability of the complete machine. When the excavator works in a worksite with complex working condition, the accident rate can be effectively reduced, and the efficiency of construction operation is increased; andmoreover, the control system has simple structure, and the control method is convenient to realize.