Abstract: A method and device for preventing impact vibration of a lift system include: acquiring a load weight in a lift container; obtaining preset basic parameters of a lift system; according to the load weight in the lift container and the basic parameters of the lift system, determining a fundamental wave vibration period of a lifting rope when the lift system starts; according to the fundamental wave vibration period and preset calculation parameters of the lift system, determining time-varying simulation parameters of an acceleration of the lift system during a lifting process; according to determined time-varying simulation parameters of the acceleration, lifting the lift container.

Abstract: A double-drum linkage winding type hoisting system includes a first hoisting drum and a second hoisting drum. The first hoisting drum and the second hoisting drum are engaged and linked through engagement structures on outer circumferences of the first hoisting drum and the second hoisting drum or are linked through a linkage intermediate member. A first hoisting rope is wound around the first hoisting drum. A second hoisting rope is wound around the second hoisting drum. The first hoisting rope and the second hoisting rope are not connected with each other.

Abstract: The present invention provides an engineering machinery hydraulic system with compensation differential pressure controllable, uses an electronic pressure compensating valve to solve the problem of flow mismatch under conditions of pressure over-limit and flow saturation, and realizes proportional shunt control and high-precision flow distribution of the system. The engineering machinery hydraulic system disclosed in the present invention has the advantages of low energy consumption, fast response speed, and high flow control precision.

Abstract: This invention relates to a plasma chemical vapor deposition microwave resonant cavity, which has a high focusing ability and can be flexibly configured. The resonant cavity is a rotary body formed by two isosceles triangles intersecting at the vertex angles with a Boolean union operation. The base angles of the two triangles are 50°˜75°. Between 2n?˜(2n+0.5) ?, the base lengths of the two triangles are equal or have an n? difference, where n is an integer and ? is the microwave wavelength. The distance between the centroids of the upper and the lower isosceles triangles is 0˜4/5?. A strongly focused electric field can be formed in the cavity by adjusting the base lengths, base angles and centroid distance. Different dielectric windows, microwave coupling modes and gas inlet and outlet modes can be selected in the cavity to fit specific applications. The cavity has simple structures.

Abstract: A device for determining an expansion pressure and an expansion displacement generated by coking coal based on self-regulation of a spring includes a pyrolysis reactor, which is provided in a high temperature carbonization furnace. Two porous pressing plates are provided at both sides of a coal sample, and two metal filter plates are provided at both sides of the sample. Upper and lower openings of the reactor are sealed respectively with a connecting flange. The pressing plate above the sample is connected to a mounting baffle of a detection mechanism through a lightweight connecting rod and a spring. The detection mechanism is provided with a displacement sensor and a pressure sensor. This application further provides a detection method using the above device.

Abstract: A mine explosion-isolating hoisting device with a built-in type permanent magnet motor includes a spindle fixed on the ground; a permanent magnet motor stator fixed on the spindle; a drum rotating relative to the spindle, the drum surrounding the spindle circumferentially; and a permanent magnet motor external rotor fixed by a spoke plate and rotating relative to the spindle; the drum is connected to the permanent magnet motor external rotor via an isolating disc; and a radial distance between an outer circumferential surface of the permanent magnet motor external rotor and an inner wall of the drum is greater than a preset value.

Abstract: The present disclosure provides a high-speed random number generation method and device, comprising an entropy source module and an entropy sampling module. The entropy source module is an autonomous Boolean network formed by digital logic gates, the network is formed by an XNOR gate and (N?1) XOR gates, wherein the value of N is equal to 3n (n is a positive integer), and the entropy source can generate chaotic signals having wide and flat frequency spectrum. The entropy sampling module of the present disclosure is formed by D flip flops used for sampling and quantizing the chaotic signals to generate random number sequences. The random number sequences generated by the present disclosure can pass test standards (NIST and Diehard statistic tests) of random number industry and have excellent random statistic characteristics.

Abstract: A rock sanding device includes a base, a bottom sanding plate, an adjustable connecting rod, an elastic loader, a connector, a side sanding brush, a top sanding plate, an inner rod, a prong and a drill rod. The top of the drill rod is fixedly connected with the rotating shaft of the external water drilling rig and the external water drilling rig has a water inlet joint to introduce water into the drill rod. The inner rod and drill rod are connected and fixed coaxially, and the bottom of the drill rod is symmetrically welded with four prongs. The rock specimen is placed in the center of the side sanding brush. The top sanding plate and the bottom sanding plate are provided in the top side and bottom side of the rock specimen, respectively.

Abstract: A turnout apparatus for an overhead monorail includes a frame, an input fixed rail docking an input rail, output fixed rails each docking an output rail, and movable rails disposed between the input fixed rail and the output fixed rails. The input fixed rail is disposed at one end of the frame. The output fixed rails include a first output fixed rail and a second output fixed rail disposed at the other end of the frame. The movable rails include a first movable rail docking the input fixed rail and the first output fixed rail, and a second movable rail docking the input fixed rail and the second output fixed rail. The first and second movable rails are fixed and rotatable about a horizontal line as an axis. Directions toward which upper rail surfaces of the first movable rail and the second movable rail face differ by 180 degrees.

Abstract: An overwinding buffer device and method are employed for a vertical hoisting system including a derrick and a hoisting container. A hydraulic buffer device is disposed on the derrick, the hydraulic buffer device including at least one buffering hydraulic cylinder and buffering pressure rollers disposed corresponding to the buffering hydraulic cylinders; the buffering hydraulic cylinders are disposed on the derrick; piston rods of the buffering hydraulic cylinders are disposed horizontally and outer ends of the piston rods face towards the hoisting container; the buffering pressure rollers are horizontally fixed on an outer side wall of the hoisting container and arced surfaces of the buffering pressure rollers face towards the piston rods of the buffering hydraulic cylinders.

Abstract: The present disclosure provides a high-speed random number generation method and device, comprising an entropy source module and an entropy sampling module. The entropy source module is an autonomous Boolean network formed by digital logic gates, the network is formed by an XNOR gate and (N?1) XOR gates, wherein the value of N is equal to 3n (n is a positive integer), and the entropy source can generate chaotic signals having wide and flat frequency spectrum. The entropy sampling module of the present disclosure is formed by D flip flops used for sampling and quantizing the chaotic signals to generate random number sequences. The random number sequences generated by the present disclosure can pass test standards (NIST and Diehard statistic tests) of random number industry and have excellent random statistic characteristics.

Abstract: A giant gully-crossing vehicle for polar scientific expeditions, including a gully-crossing bridge and a vehicle body. The vehicle body includes a stage and a travelling portion. The stage includes a top platform, a front bottom plate, a rear bottom plate and a multifunctional lock platform assembly. The front bottom plate and the rear bottom plate are capable of sliding independently relative to the top platform. The travelling portion includes a first travelling component, a second travelling component, a third travelling component, a fourth travelling component, a fifth travelling component and a sixth travelling component which are symmetrically provided at left and right sides of the stage and below the stage. Bridge bodies of the bridge components can be assembled to two gully-crossing bridges, and are connected to the multifunctional lock platform assembly when crossing gullies.

Abstract: The present invention discloses a load-sensing multi-way valve with a variable differential pressure, where each valve group uses a new element: an electro-hydraulic pressure compensation valve, so as to implement continuous real-time adjustment and control of compensated differential pressure and real-time position feedback and monitoring of a compensation valve trim, and overcome a flow mismatch problem of a conventional LS system in a flow saturation working condition and problems of a fixed shunting proportion of an LUDV system and poor operation coordination of actuators. The load-sensing multi-way valve with a variable differential pressure disclosed in the present invention has advantages such as strong working condition applicability, high flow distribution accuracy, and strong technicality.

Abstract: An overwinding buffer device and method are employed for a vertical hoisting system including a derrick and a hoisting container. A hydraulic buffer device is disposed on the derrick, the hydraulic buffer device including at least one buffering hydraulic cylinder and buffering pressure rollers disposed corresponding to the buffering hydraulic cylinders; the buffering hydraulic cylinders are disposed on the derrick; piston rods of the buffering hydraulic cylinders are disposed horizontally and outer ends of the piston rods face towards the hoisting container; the buffering pressure rollers are horizontally fixed on an outer side wall of the hoisting container and arced surfaces of the buffering pressure rollers face towards the piston rods of the buffering hydraulic cylinders.

Abstract: A method and device for preventing impact vibration of a lift system include: acquiring a load weight in a lift container; obtaining preset basic parameters of a lift system; according to the load weight in the lift container and the basic parameters of the lift system, determining a fundamental wave vibration period of a lifting rope when the lift system starts; according to the fundamental wave vibration period and preset calculation parameters of the lift system, determining time-varying simulation parameters of an acceleration of the lift system during a lifting process; according to determined time-varying simulation parameters of the acceleration, lifting the lift container.

Abstract: A composite catalyst for coal depolymerization, the catalyst includes an agent A and an agent B. The agent A includes an iron salt-based catalyst, and the agent B includes a metal salt-based catalyst different from the iron salt-based catalyst. The agent A and the agent B are alternately added during use.

Abstract: The disclosure relates to a zeolite catalyst for side-chain alkylation of toluene with methanol, including a zeolite NaX and Na3PO4 or Na2HPO4 supported on the zeolite NaX. The zeolite catalyst can be effective for catalyzing the side-chain alkylation of toluene with methanol. The disclosure also relates to a process for preparing a zeolite catalyst for side-chain alkylation of toluene with methanol, which is simple, practical and cheap in cost.

Abstract: The present invention discloses an integrated broadband chaotic semiconductor laser using optical microcavities. The arc-shaped hexagonal laser outputs light. Part of the light is totally reflected through the deformed microcavity and then reflected out of the deformed microcavity from the passive waveguide II; after entering the passive feedback waveguide, another part of the light is fed back into the deformed microcavity by the high reflection film, passes through an in-cavity ray track and then is also reflected out of the deformed microcavity from the passive waveguide II; the two-path light is coupled into the arc-shaped hexagonal laser, and finally generated chaotic laser light is directionally coupled and output through the passive waveguide I at the other end of the arc-shaped hexagonal laser. The present invention has wide broadband, flat spectrum, compact structure, and no time delay signature.

Abstract: Provided are a suspension device of a monorail crane and a monorail crane. The suspension device includes a suspension box and at least one set of suspension wheels; the suspension box is provided with a receiving groove for receiving at least one set of the suspension wheels; the receiving groove is provided with a first suspension wheel and a second suspension wheel; a first gap is formed the first suspension wheel and the second suspension wheel; the monorail includes at least a first track on which the first suspension wheel is placed and a second track on which the second suspension wheel is placed; a spacer is provided between the first track and the second track; the first gap can accommodate at least the spacer; the suspension devices each further includes a braking mechanism fixed to the suspension box.

Abstract: A lifting mechanism includes a lifting beam, a hanging portion suspended below the lifting beam and including a hanging base, a hanging chain, a movable sprocket disposed on the hanging base, a distance adjusting sprocket, and a power mechanism. The distance adjusting sprocket and the power mechanism are arranged side by side and separately on the lifting beam. The power mechanism includes a fixed sprocket and a driving portion. The fixed sprocket is driven by the driving portion to drive the hanging chain to move, so as to lift or lower the hanging portion. An end of the hanging chain is fixed to the lifting beam, and the other end of the hanging chain engages the movable sprocket, the fixed sprocket, and the distance adjusting sprocket, or the other end of the hanging chain engages the movable sprocket, the distance adjusting sprocket, and the fixed sprocket.