107results about How to "Save volume and space" patented technology

The invention discloses a method in a boat control field and especially relates to the sliding mode-reverse step double loop trace tracking control method of an underactuated unmanned surface vehicle.The method comprises the following steps of firstly, establishing a three-degree-of-freedom motion mathematical model of the heading, the surging and the swaying of the unmanned surface vehicle; then, through an integrated pose sensor, measuring the current position information of the unmanned surface vehicle, combining the real-time position and the reference trace of the unmanned surface vehicle, calculating an error under a boat body coordinate system; and then, designing a kinematic loop trace tracking controller based on a backstepping method, and designing a dynamic loop trace trackingcontroller based on a sliding mode control algorithm. Through a sliding mode-reverse step double loop trace tracking controller, the trace tracking control of the unmanned surface vehicle Is realized,the unmanned surface vehicle can track a linear trace, and the stability and accuracy of unmanned surface vehicle navigation can be increased.

The invention discloses a winch hydraulic system controlling a guide rope through stepless speed regulating constant tension, and relates to the field of tension controlled winch hydraulic systems. The system comprises a fuel tank, a motor, a volume adjustable hydraulic pump, a one-way valve, a high-pressure overflow valve, a backpressure overflow valve, a motor operating valve bank, a winch motor, a brake oil cylinder, a plate-type overflow valve, a proportional overflow valve, a first threaded cartridge shuttle valve, a second threaded cartridge shuttle valve, a two-position two-way normally-closed ball valve, and a two-position three-way electromagnetic ball valve. The system can realize stepless speed regulation and constant tension control requirement of a guide cable winch, and can solve problems of power loss caused by high-pressure overflow in a conventional hydraulic winch constant tension control system, so as to save energy resources and improve efficiency of a hydraulic system. The system is designed by using an integrated valve block, and the design reduces volume space the system occupies, and reduces the number of system pipelines, and reduces failure rate. The system is convenient to install and maintain, and can realize batch and standardized production.

The invention relates to a compound N-(4-(butyraldehyde-4-yl)-benzoyl)-L-glutamic acid dimethyl and a method which uses the compound to prepare anti-cancer drug pemetrexed. The preparation method for pemetrexed has simple post-reaction processing and high product purity, which is conducive to industrial production.

The invention provides a piezoelectric micro-thruster comprising an air inlet (1), a housing (2), a power interface (3), a filter (4), a return spring (5), a valve core (6), a piezoelectric stack (7), a washer spring (8), a valve seat (9), a seal ring (10), an adjusting ring (11), a base (12) and a nozzle (13). In the case of power-off, the surface of the valve core (6) is tightly attached to the surface of the valve seat (9) and the surface of the adjusting ring (11), and the piezoelectric micro-thruster is off; in the case of power-on, the piezoelectric stack (7) deforms to drive the valve core (6) to move, the surface of the valve core (6) separates from the surface of the valve seat (9) and the surface of the adjusting ring (11), the piezoelectric micro-thruster is on and generates thrust. The sealing parts, such as the valve core (6), the valve seat (9) and the adjusting ring (11), are all made of metal, thus the piezoelectric micro-thruster is metal sealed. The piezoelectric micro-thruster is short in response time, continuously adjustable in thrust, low in power consumption and long service, meets the strict requirements of miniature satellites and missile precision guides for micro-thrust systems and is light in weight and small in size, and more weight and space are saved for the miniature satellites.

The invention discloses a disc solid laser amplifier, comprising a disc crystal unit, a reflection unit, a right-angle reflector and 2n reflection focusing units. Each reflection focusing unit is composed of a lens and a right-angle prism. A focus of the lens in each reflection focusing unit is overlapped mutually. Two reflection focusing units form a pair. The axes of the lenses are symmetric about a normal of a disc crystal center. The center of the disc crystal unit is located at the overlapped focus of each reflection focusing unit. The reflection unit is located around the reflection focusing units and is used for importing or exporting light. The right-angle reflector is located between the lenses and the right-angle prisms in the reflection focusing units. Included angles between two optical reflection surfaces of the right-angle reflector and the inclined surfaces of the right-angle prisms are 45 degrees. According to the disc solid laser amplifier, seed light is amplified through the serially connected disc crystals and lens-right-angle reflector combinations, so the technical problem that in the prior art, the amplification times of the seed light is low and the beam quality is low is solved.

The invention provides a fluorescent rotating wheel heat dissipating module of a laser projection system. The fluorescent rotating wheel heat dissipating module of the laser projection system comprises a fluorescent rotating wheel, multiple air guide holes and blades. The fluorescent rotating wheel is provided with a first surface and a second surface opposite to the first surface. An outer fluorescent ring is arranged on the periphery of the first surface. The air guide holes penetrate through the first surface and the second surface of the fluorescent rotating wheel. The blades are arranged on the second surface of the fluorescent rotating wheel and are provided with an air inlet and first air outlets. A laser source of the laser projection system is projected at a fixed point on the outer fluorescent ring, when the fluorescent rotating wheel rotates, the blades guide airflow to enter from the air inlet of the blades, part of the airflow flows out from the first air outlets of the blades laterally, part of the airflow passes through the second surface via the air guide holes to flow to the first surface, and then heat dissipation is carried out on the fluorescent rotating wheel and the outer fluorescent ring.

The invention relates to the field of automobile engines, in particular to an automobile engine camshaft which is characterized by comprising a main oil gallery in an axial direction and a partition member used for partitioning the main oil gallery into an open cavity and a closed cavity and arranged in the main oil gallery positioned at a first shaft neck of the camshaft, wherein an oil path communicated with a phaser is arranged on the camshaft at the open cavity end, an oil inlet hole communicated with the main oil gallery is arranged at the first shaft neck at the closed cavity end, and the cam shaft and other shaft necks matched with bearing covers are all provided with auxiliary oil galleries communicated with the main oil gallery. Because the camshaft is provided with lubricating oil galleries in per se and lubricating oil of the camshaft is supplied by the first bearing cover, the automobile engine camshaft reduces the quantity of the oil galleries arranged on a cylinder cover, lowers the machining difficulty and has the advantages of cost saving, improvement of the working efficiency, compact structure and reduction of the volume space of engines and weight reduction.

The invention discloses a computer input unit with dual-spectrum and dual-coordinate output, a dual-spectrum data input processing method and a sensor thereof. The computer input unit comprises a first luminous source, a second luminous source and a sensing module, wherein the first luminous source is used for generating a first projection light beam with first wavelength; the second luminous source is used for generating a second projection light beam with second wavelength; and the sensing module comprises a filtering unit, a light signal receiving zone, a control unit and a storage unit, the filtering unit respectively filters the first projection light beam with first wavelength and the second projection light beam with second wavelength, the light signal receiving zone receives the first projection light beam to obtain first image data and receives the second projection light beam to obtain second image data, the control unit compares the obtained first image data with the obtained second image data so as to figure out first displacement data and second displacement data, and the storage unit stores the first displacement data and the second displacement data.

The invention relates to the technical field of computer information, and provides a method, system and device for achieving multiple partitions and multiple disk identifiers on the basis of a single disk. According to the method for achieving multiple partitions and multiple disk identifiers on the basis of the single disk, file management of a multi-user multi-attribute storage device is achieved, different levels of permissions are open to different levels of users, file management of multiple users and the openness of the system are improved, the experience degree of the users is greatly improved, and the technical problem of achieving multiple partitions, multiple disk identifiers and multiple attributes on the basis of the microprocessor single disk is solved. Meanwhile, compared with a technique of building a multi-partition interface in a Linux or wince system on the basis of a high-level ARM processor, single-disk multi-partition multi-disk identifier mapping can be achieved, the hardware cost of a product is greatly reduced, the product size space is decreased, and the competitive power of the product in the same trade is improved.

An air conditioner and water heater all-in-one machine comprises plate-fin reverse flow thin passage heat exchanger, a throttling device, a compressor, a four-way electronic valve, an air side heat exchanging device, a circulating pump, a three-way electronic valve I, an air conditioner terminal electronic valve, a three-way electronic valve II, an air conditioner terminal and a hot water circulating tank. The fluid inlet in one side of the plate-fin reverse flow thin passage heat exchanger is connected with the four-way electronic valve, and the fluid outlet of the plate-fin reverse flow thin passage heat exchanger is connected with the throttling device. The fluid outlet in the other side of the plate-fin reverse flow thin passage heat exchanger is connected with the circulating pump which is connected with the three-way electronic valve I. The three-way electronic valve I is connected with the air conditioner terminal electronic valve and the hot water circulating tank. The air conditioner terminal electronic valve is connected with the air conditioner terminal. The air conditioner terminal is connected with the three-way electronic valve II which is connected with the fluid inlet in the other side of the plate-fin reverse flow thin passage heat exchanger and the hot water circulating tank. The hot water circulating tank is connected with a water inlet electronic valve. The air conditioner and water heater all-in-one machine is simple in structure, low in investment and high in heating and refrigerating efficiency.

The invention discloses an electric bicycle controller. The advantages of the controller are that the controller has a miniaturization design and lower demands of installation space, terminals and lead wires are improved, automatic welding can be completely realized, the controller adopts a buckle type shell design and the assembly efficiency of the controller can be enhanced. The controller includes an upper cover of a shell, a lower cover of the shell, an upper plate of a circuit board, a lower plate of the circuit board, connecting terminals between plates, a power tube, lead terminals anda heat conduction material. The upper cover of the shell is connected and embedded to the lower cover of the shell through a buckle structure; the upper plate of the circuit board and the lower plateof the circuit board are in mechanical connection and electric connection through the connecting terminals between plates; the lower plate of the circuit board adopts an aluminum substrate structure;and the heat conduction material is filled between the lower plate of the circuit board and the lower cover of the shell, and the lower plate of the circuit board being fixed on the lower cover of theshell through bolts.