89results about How to "Stable oil pressure" patented technology

The invention provides a single-cylinder bolt expansion and contraction control system and a construction machine. The single-cylinder bolt expansion and contraction control system comprises a first reversing control valve communicated with an auxiliary oil source; a telescopic oil cylinder comprises a core pipe which is arranged on a cylinder barrel and accommodated in a piston rod; a first oil circuit is connected with the first hydraulic fluid port of the first reversing control valve; a second oil circuit is connected with the second hydraulic fluid port of the first reversing control valve; the oil inlet ends of a first check valve and a second check valve are communicated with the telescopic oil cylinder; one end of a third oil circuit is communicated with the oil outlet ends of the first and the second check valves; and the other end of the third oil circuit is communicated with an electromagnetic ball valve. The core pipe in the telescopic oil cylinder is only used for returning oil during the work process of the single-cylinder bolt expansion and contraction control system. The pressure of return oil is lower, so that the impact on the core pipe is lower, and the service life of the core pipe is prolonged.

The invention provides a full-DOF (Degree Of Freedom) wave power generation device. The full-DOF wave power generation device comprises a float, an oil tank platform, hydraulic rod groups, a support tank body and oil transportation pipes, wherein the float is arranged at the lower side of the oil tank platform; one end of each hydraulic rod group is connected with the oil tank platform, the other end of each hydraulic rod group is connected with the inner side of the support tank body, and the oil tank platform is connected with the hydraulic rod groups through the oil transportation pipes; the hydraulic rod groups comprise a transverse hydraulic rod group and a longitudinal hydraulic rod group; the longitudinal hydraulic rod group is arranged on the oil tank platform in the axial direction, and the transverse hydraulic rod group is arranged on the oil tank platform in the circumferential direction. According to the full-DOF wave power generation device provided by the invention, multiple hydraulic rod groups are adopted, one part of the hydraulic rod groups are circularly arrayed in the horizontal plane, the other part of the hydraulic rod groups are equidistantly arranged in the vertical plane in parallel, and since the motion direction of waves is not determined, the motion of piston rods in cylinder bodies can be caused by motion and rotation, which are caused by the waves, of the float in each direction.

The invention discloses a novel parallel multidimensional oscillating sea wave power generation device. The novel parallel multidimensional oscillating sea wave power generation device comprises a floater, and a sealing cover plate, a two-dimensional rotating hinge, an oscillating rod, an oscillating platform, six hydraulic cylinders, an oil tank, a hydraulic motor, a power generator and an energy accumulator which are all arranged in the floater, wherein the sealing cover plate is fixedly connected to a protruding eave of the floater; the oil tank is fixedly connected to the floater; one end of the two-dimensional rotating hinge is fixedly connected to the sealing cover plate and the other end is connected to the oscillating rod; one end of the oscillating rod penetrates through the sealing cover plate to be fixedly connected to an external device and the other end is fixedly connected to the oscillating platform; the six hydraulic cylinders are connected in parallel to work; the two ends of the six hydraulic cylinders are respectively hinged to the oscillating platform and the oil tank through spherical hinges; the oil tank is connected with the hydraulic motor through a flow-dividing pipe and a return pipe; the power generator is connected with the hydraulic motor; the power generator and the hydraulic motor are arranged on the bottom surface of the floater; the energy accumulator is connected with the hydraulic motor. The novel parallel multidimensional oscillating sea wave power generation device has the advantages of long service life, low maintenance cost, low environmental pollution, capability of fully absorbing sea wave energy, high power generation efficiency and the like.

The invention discloses a rotary-vane vacuum pump and provides an anti-oil back streaming structure of the vacuum pump. The anti-oil back streaming structure is an ingenious idea and avoids pumping oil entering into the pump chamber and vacuum system when the vacuum pump shouts down, thereby solving the technical problems that the pumping oil enters into the pump chamber after the vacuum pump shuts down which leads to difficult start of the vacuum pump and damage of related parts in severe cases, and the pumping oil enters into the vacuum system in cases of failures of the anti-oil back streaming valve, and the like in the prior art. The anti-oil back streaming structure comprises a pump stator and a pump rear cover, wherein a pump rotor is eccentrically arranged in the pump chamber bounded by the pump stator and the pump rear cover, an oil storage tank is arranged on the pump rear cover, the upper shield of the oil storage tank is provided with an elastic valve block, a pumping oil outlet channel and a pumping oil introduction channel are arranged in the pump rear cover, one end of the pumping oil outlet channel is communicated with one end of the pumping oil introduction channel in the oil storage tank, the other end of the pumping oil outlet channel is connected with the oil pump, the other end of the pumping oil introduction channel is communicated with the end surface of the pump rotor corresponding to the pump rear cover, and a vent is arranged on a passage conducting air between the end surface of the pump rotor and the oil pump.

The invention discloses a duplex hydraulic packer of a papermaking-method reconstituted tobacco production line and a working method thereof. The packer comprises a tobacco storage cabinet, a conveying belt, an electronic belt scale, a vibrating groove and a material distribution trolley which are sequentially connected with one another, wherein material boxes and pressing heads are respectively arranged at the two sides of the material distribution trolley; each group of material boxes and pressing heads is provided with a carton conveying belt motor and is in action connection with a box inlet roller way, and each box inlet roller way is provided with a box inlet roller way motor; each group of material boxes and pressing heads is further in action connection with a box conveying trolley, a box conveying trolley motor and a box conveying trolley roller way motor are arranged at the two ends of each box conveying trolley, each box conveying trolley is in action connection with a conveying roller way, and each conveying roller way works through the drive of a conveying roller way motor. The duplex hydraulic packer of the papermaking-method reconstituted tobacco production line and the working method thereof have the beneficial effects that the performance of a servo system is exerted fully and the production efficiency of tobacco packing is increased.

The invention provides a construction method for synchronously jacking the whole bridge to replace a support, and belongs to the field of municipal construction. The construction method comprises thefollowing steps that S1, preparation work is carried out before jacking; S2, jacking preparation is carried out; S3, trial jacking is carried out; S4, a main beam is jacked synchronously; and S5, thesupport is replaced. Temporary supporting is conducted so that the old support is withdrawn, a leveling steel plate is additionally arranged, and the beam is fallen down; after the leveling steel plate and the new support are installed, beam falling and reset operation can be conducted, all jacks are subjected to oil returning and beam falling synchronously, the beam body needs to be kept overallbalanced in the beam falling process, and synchronous overall beam falling is conducted according to the jacking inverse process and in a graded mode till the beam body is completely fallen. Accordingto the construction method, on the premise that the bridge structure is not damaged and the stress condition of the bridge structure is not changed, the limitation that the engineering beam is largein tonnage, small in space and the like is effectively solved by adopting a multi-point whole jacking mode, the support is replaced well, and the bridge operation condition is good.

The invention discloses an ultrahigh pressure radial plunger pump, and belongs to the technical field of hydraulic control. The ultrahigh pressure radial plunger pump comprises a motor which is arranged on a bearing framework, an eccentric shaft is sleeved on an output shaft of the motor, multiple sets of plunger pumps are evenly distributed on the periphery of the eccentric shaft, the multiple sets of plunger pumps with the output shaft of the motor as the center, a conical roller bearing is sleeved on the eccentric shaft, and the outer ring of the conical roller bearing simultaneously contacts with the top ends of the multiple sets of plunger pumps with the output shaft of the motor as the center. The ultrahigh pressure radial plunger pump can achieve variable pressure and variable flow, the multiple plunger pumps can be in parallel connection, oil mass supply of a large-scale hydraulic pressure station is satisfied, sealing performance is good, service life is long, reliability is high, performance cost ratio is high, and the ultrahigh pressure radial plunger pump is suitable for application and popularization.

The invention provides a foaming machine which includes a clamping device. The clamping system includes a lower template which is fixed on the base of the foaming machine and is fixedly provided with a guide shaft; a middle template which is provided with a lower die, arranged above the lower template and can move up and down along the guide shaft; an upper template which is provided with an upper die opposite to the lower die and is arranged on the top part of the guide shaft and is above the middle template; an oil cylinder which is arranged between the middle template and the lower template and is characterized in that the oil cylinder is a secondary oil cylinder. The foaming machine according to the invention can reduce the height of the machine, increasing the parallelism of a compression die, improving the utilization efficiency of energies and improving the automatization of the machine.

The invention relates to an engine oil pump with variable displacement. The engine oil pump with the variable displacement comprises a blade groove wheel which generates negative pressure through rotation so as to enable engine oil to be absorbed in the engine oil pump from an oil bottom casing. Blades of the blade groove wheel are arranged in a rotation cavity of an engine oil pump casing, and the rotation cavity is arranged on the engine oil pump casing through an eccentric distance adjusting mechanism and a blade central shaft in adjustable eccentric distance mode. The invention further provides an engine lubrication system with the engine oil pump with the variable displacement. The engine oil pump is simple in structure, short in engine oil flow oil path and small in oil path resistance, guarantees main oil path oil pressure, and simultaneously can save energy and reduce emission. The engine oil pump and the lubrication system are suitable for engines of various vehicles.

The invention discloses a pressure limiting valve of an engine. The pressure limiting valve of the engine comprises a valve body, a valve element and a spring, wherein the valve element and the spring are arranged in the valve body; the valve element is in sliding fit with the valve body through the spring; the valve body is provided with an oil discharging hole and an oil feeding hole; the oil feeding hole and the oil discharging hole are connected with each other while the spring is compressed and are disconnected from each other while the spring recovers; the spring is a variable-stiffness spring; and the stiffness of one end, which is close to the valve element, of the variable-stiffness spring is smaller than that of the other end, which is far away from the valve element, of the variable-stiffness spring. Because the spring is the variable-stiffness spring, the stiffness of the side, which is close to the valve element, of the spring is small; when the pressure of a main oil gallery fluctuates, the recovery speed of the valve element is reduced, fluctuation of the valve element due to high stiffness of the inside of the valve body is effectively restrained, and a phenomenon that the spring and the engine naturally vibrate, so that resonance is caused, and the spring is broken is avoided; the service life of the spring is greatly prolonged; and the working reliability of the pressure limiting valve is improved. The invention also provides an engine comprising the pressure limiting valve.

The invention discloses a brick making system device, and belongs to the technical field of brick manufacture. A three-box batching machine vibration device is arranged between a three-box batching machine and a weighing device, a brick making pipeline is changed, and an automatic board feeding machine matched with a brick making machine is additionally arranged. A discharging port of the weighing device is connected with a feeding port of a stirrer through a conveying belt, and a discharging port of the stirrer is connected with a feeding box of the brick making machine through a conveying belt. After the vibration part is added, the size of material particles can be effectively reduced, a metal object is screened and removed, product quality is guaranteed, a using ratio of a die is improved, and a damaged rate of the brick making machine is reduced. The pipeline of the brick making machine is shortened, maintenance is convenient, oil pressure is stable, energy consumption is low, and maintaining cost is effectively reduced. After the matched automatic board feeding machine is additionally arranged, labor intensity is reduced, four to six boards can be pushed at a time, and working efficiency is improved accordingly.

Provided is a tensioner capable of stabilizing an oil pressure in an oil pressurizing chamber. The tensioner includes a pressure adjustment unit. The pressure adjustment unit includes a unit case attached to the housing or the plunger, a moving member disposed in the case inner space to be capable of moving closer to and farther away from the oil pressurizing chamber, and a pressure adjustment biasing unit which biases the moving member toward the oil pressurizing chamber. A gap between an inner wall of the case inner space and the moving member is configured to be held in a liquid tight state at any position between a position where the moving member is closest to the oil pressurizing chamber as a result of moving and a position where the moving member is most distant from the oil pressurizing chamber.

The invention discloses a lubricating structure of a speed reduction transmission device for a gas turbine. The speed reduction transmission device comprises a sun gear shaft, a gear holder and a plurality of transmission gears, wherein the transmission gears are uniformly distributed on the gear holder in the circumferential direction; a lubricating oil distributing ring is arranged at the oil outlet end of a lubricating oil channel in the gear holder; an annular oil supply base of the lubricating oil distributing ring is embedded into a center hole of the gear holder and forms a closed oil way ring cavity; a radial oil spraying hole in each radial oil spraying pipeline guides lubricating oil to be sprayed to meshing points of the sun gear shaft and the transmission gears in the radial direction; and a tail end oil spraying hole in an axial nozzle is right opposite to a front end oil inlet of a central lubricating oil passage, guides the lubricating oil to flow to the rear end of thesun gear shaft and further distributes the lubricating oil distribution. The lubricating structure has the advantages that the overall structure is ingenious, the oil pressure is stable, the lubricating and cooling effects on friction pairs such as the sun gear shaft and the transmission gears are good, and guarantees can be provided for weight reduction, stable and reliable operation and prolongation of the service life of the gas turbine.

The invention discloses a low-temperature screw oil press, which comprises a press, and the press includes a press cage and a press head fixed at one end of the press cage, and the cake outlet head and the press head are arranged in a space formed by There is a screw press shaft, and the end of the screw press shaft close to the press head communicates with the outside world through the cake outlet of the cake outlet on the press head; the press cage communicates with the feeding funnel; the press cage communicates with the The feed funnel is connected, and also includes a frequency conversion motor and a frequency converter to control the speed of the frequency conversion motor. The frequency conversion motor drives the screw press shaft to rotate through a reducer; the diameter of the end of the screw press shaft close to the cake outlet It is smaller than the diameter of the end of the screw press shaft away from the cake outlet head. The invention has simple manufacturing process and small volume, improves the transmission efficiency of the oil press, improves the oil yield, and reduces the pressing temperature.

The invention provides a hydraulic driving device for a draught fan of a pneumatic type seeding machine, relating to the technical field of pneumatic type seeding machines. The hydraulic driving device is characterized in that a power output shaft of a tractor is connected with an oil pump and drives the oil pump to rotate, power oil supplied by the oil pump is conveyed to a hydraulic motor by an oil pump outlet pipe and a hydraulic motor inlet pipe, the hydraulic motor drives the draught fan for seeding to rotate, and is communicated with an oil tank by a hydraulic motor outlet pipe, a hydraulic control element is arranged in a hydraulic system, and the running speed of the draught fan for seeding is controlled by the hydraulic control element. The hydraulic driving device has the beneficial effects of being matched with the tractor conveniently, ensuring the stable rotation of the hydraulic motor for driving the draught fan for seeding without limitation of the size of an oil valve of the tractor to finally achieve ideal seeding, and overcoming the phenomena of unstable wind power, seedling shortage and seedlingless ridges caused by turning, stopping, machine tool lifting and the like of the existing domestic pneumatic type seeding; besides, the hydraulic driving device has the characteristics of simple and compact structure, small occupied area, convenience in adjustment and reliability in working.

The present invention discloses a sugarcane mill roller, which belongs to the technical field of sugarcane sugar-pressing equipment manufacturing. The sugarcane mill roller includes a roll shaft and a roller body installed on the roll shaft, roll teeth are installed on the outer surface of the roller body, each roll tooth has a tooth top surface and tooth side surfaces connected to both sides of the tooth top surface, a wear-resistant layer is provided on the tooth top surfaces and the tooth side surfaces; and the wear resistant layer is a chromium carbide surfacing welding layer with a thickness of 1 to 2 mm. Compared to the prior art, the surface hardness of the roller teeth is improved in the present invention, and the roller teeth only require replacement after being used for two milling campaigns, so that the service life of the sugarcane mill roller is prolonged.

The invention discloses an automatic air-exhausting fuel oil filtering system. The automatic air-exhausting fuel oil filtering system comprises a filter base and a filter tank arranged on the filter base. The filter base is provided with an oil inlet cavity and an oil outlet cavity, and the oil inlet cavity is communicated with an inner cavity of the filter tank through an oil inlet channel. An automatic air exhausting device is arranged above the oil inlet cavity or the oil inlet channel and comprises a one-way valve seat. The one-way valve seat comprises a valve seat body, an outer installation head, an inner installation head, installation outer threads arranged on the outer installation head and matched with threads, first installation inner threads, second installation inner threads, a valve cavity arranged in the valve seat body, a one-way valve body, a sealing ring, a one-way valve spring and an in-through-hole hexagonal nut, wherein the valve seat body, the outer installation head and the inner installation head are integrated, the first installation inner threads and the second installation inner threads are arranged on the inner installation head and matched with threads, and the one-way valve body, the sealing ring, the one-way valve spring and the in-through-hole hexagonal nut are installed in the valve cavity. By means of the automatic air-exhausting fuel oil filtering system, air in an oil way can be effectively and automatically removed, fuel oil can be saved, it can be guaranteed that an engine stably runs, flameout conditions can be avoided in the running process, and the service life of movement parts in a high-pressure oil pump is prolonged.

The invention relates to nanometer dual-fuel lubricating oil comprising the following mixed components in percentage by weight: 95.6% of base oil, 1% of composite special nanometer ceramic anti-wear agent, 1.2% of high-base number synthetic calcium sulfonate T-106, 0.7% of dual succinimide ashless dispersant T-154, 1.4% of sulfur phosphorous butyloctyl zinc salt T-202 and 0.1% of non-silicon composite anti-foaming agent 2#. The nanometer dual-fuel lubricating oil disclosed by the invention has the advantages of effectively reducing the abrasion of a motor, prolonging the service life of the motor, remarkably improving the fuel efficiency, reducing the fuel consumption, obviously reducing the exhaust gas emission, reducing the air pollution, protecting the environment, effectively improving the working environment of the motor, improving the acceleration performance, increasing the power, obviously reducing the temperature of the motor, reducing the equilibrium temperature of parts and the lubricating oil to about 75 DEG and eliminating the mechanical thermal expansion phenomenon, having excellent cleaning dispersing performance and effectively controlling the generation of oil sludge carbon deposit to ensure that the oil products are not easy to age.

The invention discloses a diesel common rail pressure and rotation speed coupling control system based on a sliding mode variable structure. The diesel common rail pressure and rotation speed couplingcontrol system based on the sliding mode variable structure comprises a fuel injector, a fuel injector control unit, a high pressure common rail tube, a rotation speed sensor and a control valve, wherein common rail pressure in the high pressure common rail tube is set and controlled by an engine control system, and adjusted along with changes of engine load, the control valve comprises an electromagnetic valve located on a fuel inlet pipeline of the high pressure common rail tube and used for changing the capacity of a hydraulic cavity, a counterbalance valve located on a fuel return pipeline of the high pressure common rail tube, a pilot-operated type overpressure regulating valve located on the upper stream of the high pressure common rail tube and used for overpressure protection, anda pilot valve which controls fuel injection quantity by changing pressure of front and rear cavities of a piston in a piston type flow switch, a non-linear relationship between the rotation speed andthe fuel injection quantity of a diesel is represented through a non-linear speed regulating system model based on the sliding mode variable structure, and stability of fuel injection is guaranteed by using the non-linear speed regulating system model and controlling the control valve. The diesel common rail pressure and rotation speed coupling control system based on the sliding mode variable structure guarantees stability of the fuel injection, and is good in reliability, stability and robustness.

The invention particularly relates to a valve body of an automobile hydraulic brake valve and a production process thereof, belonging to the technical field of automobile spare parts, the valve body includes two communicating ports, a conical end face is arranged at one of the ports of the valve body, four sets of radial through holes are arranged in the middle of the valve body, which are a radial through hole I, a radial through hole II, a radial through hole III and a radial through hole IV, the radial through hole I and the radial through hole II are perpendicular to and intersect with each other, the radial through hole III and the radial through hole IV are perpendicular to and intersect with each other, the wall thickness of the valve body is h, the inner diameter of the valve bodyis R, the radial through hole I, the radial through hole II, the radial through hole III and the radial through hole IV have the same aperture r, and r<h<2r<R<3r. The valve body has the advantages ofsimple structure, light weight, high structural strength, long service life, and can provide stable oil pressure, so that the braking is faster and more sensitive.

The invention discloses a vehicle fuel supply system which comprises an engine, a pressure regulator, an electric fuel pump and a fuel tank; the electric fuel pump is positioned in the fuel tank; the engine communicates with the pressure regulator; the pressure regulator communicates with the electric fuel pump through a fuel inlet tube; an energy accumulator and a rheostat are connected between the engine and the electric fuel pump; the energy accumulator is connected to the rheostat; one end of the energy accumulator communicates with the engine; and other end of the rheostat is electrically connected to the electric fuel pump to form a loop. The vehicle fuel supply system is simple in structure and is low in cost, can control fuel pump capacity of the electric fuel pump according to needs of the engine, is high in control flexibility, is good in reliability, effectively saves energy, and solves the problem that energy of the fuel supply system is wasted.