1578 results about "Reversing valve" patented technology

The invention discloses a device for measuring flowability of explosive modeling powder, which comprises a step-press-loading analogue unit, a timing and weighing unit and a computer control unit, wherein the step-press-loading analogue unit directly and indirectly drives a screw rod which extends into a blanking bin to rotate and perform reciprocating movements along an axial line and drives a pusher dog in the blanking bin to perform the reciprocating movements along an arc section through the combined action of a cylinder and a pneumatic reversal valve so as to ensure that the explosive modeling powder in the blanking bin falls into the timing and weighing unit, and the process more truly imitates an explosive conveying process of an explosive step-press process. The timing and weighing unit transmits a weighing value of the explosive modeling powder which falls in the timing and weighing unit to the computer control unit in real time, and the computer control unit calculates the instantaneous flow speed of the explosive modeling powder of a north side and generates a flow speed-time curve according to sampling data. The device can measure the flowability of the explosive modeling powder so as to provide an objective basis for choosing a proper explosive step-press process for the explosive modeling powder.

The application provides a two-position five-way pneumatic reversing valve, and relates to the technical field of hydraulic control valves.The valve body is provided with a first air outlet hole, an air hole and a second air outlet hole from left to right on the lower side, and the inner cavity of the valve body is provided with a valve core.The left end of the valve body is provided with a front baffle, and the right side of the valve body is provided with a piston assembly, which is in contact with the right end surface of the valve core.The valve body is provided with a first annular protrusion, a second annular protrusion, a third annular protrusion, a fourth annular protrusion and a fifth annular protrusion corresponding to each hole.The outer side of the air hole is provided with a plug A, and the air hole is connected with the piston assembly through a pipeline arranged in the valve body.The pipeline is internally provided with a plug B.The electromagnetic structure of the application is integrated, and the parts have better coaxiality during production and assembly, effectively ensuring the service life of the product and the extremely low product failure rate.Compared with the existing split structure, the application has higher electromagnetic conversion efficiency and can effectively reduce the power consumption of the product.

The invention relates to the technical field of drilling, and provides a roofbolter feedforward-feedback model-free adaptive tracking control method and system based on rotation force. According to the method, a valve-controlled hydraulic propulsion control model for driving a hydraulic cylinder and a corresponding reversing valve in the working process of the hydraulic jumbolter is established, and a nonlinear autoregressive moving average model between the propulsion force in the working process of the hydraulic jumbolter and the output driving current of the reversing valve is obtained through the valve-controlled hydraulic propulsion control model; through a nonlinear autoregression moving average model of the hydraulic jumbolter, an output identification observer deployed with a data-driven adaptive control algorithm of the hydraulic jumbolter is established, and the output identification observer performs adaptive tracking control on the working state of the hydraulic jumbolter through the deployed data-driven adaptive control algorithm. The tracking control problem of the valve control electro-hydraulic servo unit under the complex working condition is effectively solved.

The invention discloses a hydraulic system for preventing reversing cutoff of a cone valve type filling industrial pump. The hydraulic system comprises a first oil pump set, a second oil pump set, a main oil cylinder set, a first pressure valve suction valve oil cylinder set, a second pressure valve suction valve oil cylinder set, a reversing valve set and a pipeline. The first oil pump set is composed of a first oil pump, a second oil pump and a first constant-pressure oil pump set. The second oil pump set is composed of a third oil pump, a fourth oil pump and a second constant-pressure oil pump set. The first pressure valve suction valve oil cylinder set comprises a first pressure valve oil cylinder and a first suction valve oil cylinder, and the second pressure valve suction valve oil cylinder set comprises a second pressure valve oil cylinder and a second suction valve oil cylinder. The reversing valve group comprises first to sixth reversing valves. According to the reversing cutoff prevention hydraulic system of the cone valve type filling industrial pump, through unique structural design and assembly configuration, the cutoff problem in the reversing process is effectively solved, continuous and stable operation of the system is ensured, and the working efficiency and reliability of the industrial pump are improved.

The utility model relates to the technical field of pneumatic control systems, in particular to a single-action pneumatic PST system, which comprises a pneumatic actuating mechanism, a cam valve and an explosion-proof junction box, a valve position transponder is arranged at the front end of the pneumatic actuating mechanism, one end of the cam valve is communicated with a filtering pressure reducing valve, one end of the filtering pressure reducing valve is communicated with a safety valve, and the other end of the filtering pressure reducing valve is communicated with an explosion-proof junction box. And one end of the explosion-proof junction box is connected with a first electromagnetic valve and a second electromagnetic valve respectively. According to the improved single-action pneumatic PST system, the first electromagnetic valve, the hand-operated direction valve and the second electromagnetic valve are adopted, and when the single-action pneumatic PST system is used, flexible control can be conducted when the single-action pneumatic PST system faces complex working conditions and different operation requirements; the explosion-proof junction box and the energy accumulator are adopted, when the single-action pneumatic PST system is used, the electrical safety of the system in a dangerous environment can be guaranteed, meanwhile, the pressure of the system can be kept within a relatively stable range, and the stability of the system during use is improved.

The invention discloses a vehicle energy interaction method, device and system and a vehicle, and belongs to the technical field of vehicle control. The method comprises the steps of determining a target energy interaction mode based on driving parameters and environmental parameters of a vehicle; a first control signal and a second control signal are generated based on the target energy interaction mode, the first control signal is used for controlling the output power of a compression refrigerant flowing through the coupling compressor and the output power of compressed air, and the second control signal is used for controlling a reversing valve to be switched between a compressed air loop and a compression refrigerant loop; and cooperatively controlling a coupled compressor and a reversing valve according to the first control signal and the second control signal so as to execute an energy interaction operation between the thermal management system and the air suspension system indicated by the target energy interaction mode. The system structure of the whole vehicle is simplified, the hardware arrangement difficulty and cost are reduced, energy consumption is reduced, and therefore the energy utilization rate of the whole vehicle is increased.

A cylinder is a double-acting single-rod cylinder, one end of the cylinder is a cylinder rodless cavity, the other end of the cylinder is a cylinder rod cavity, and a cylinder body of the cylinder is sequentially provided with sensors I, II and III for detecting the position of a piston or a piston rod; high-speed operation is carried out in sensor I and II regions, and low-speed operation is carried out in other regions; a rodless cavity of the air cylinder is communicated with an OR valve I, and the OR valve I is connected with two-position three-way reversing valves I and II in parallel; a rod cavity of the air cylinder is communicated with an OR valve II, and the OR valve II is connected with two-position three-way reversing valves III and IV in parallel; the two-position three-way reversing valves I and III are connected in parallel, then connected in series with a low-speed pressure reducing valve 1 and connected with an air source; the two-position three-way reversing valves II and IV are connected in parallel, then connected in series with a high-speed pressure reducing valve and connected with an air source; the low-speed pressure-reducing valve and the high-speed pressure-reducing valve are The device is fast in opening and closing, stable in starting, low in cost, good in effect, safe to operate, simple to debug, capable of avoiding door flying, capable of improving installation efficiency and suitable for popularization.

This utility model relates to the field of beverage machine technology, and in particular to a supply system for hot and cold milk, milk foam, and milk cap. It provides a device capable of supplying dairy products in various states. A fresh milk container placed in a refrigerator is connected to a first three-way connector via a milk valve. A hot water source is also connected to the first three-way connector via a cleaning hot water valve. The third port of the first three-way connector is connected to a second three-way connector via a milk pump. A steam valve, a third three-way connector, a check valve, and a fourth three-way connector are sequentially installed on the pipeline connecting the steam boiler to the second three-way connector. The third port of the third three-way connector is connected to the air inlet via an air pump, the flow rate of which is adjustable. The third port of the fourth three-way connector is connected to the cold water inlet via a cleaning cold water valve and a cold water pump. The third port of the second three-way connector is connected to a reversing valve via a milk frother, and then the reversing valve redirects the flow to either the milk outlet or the cleaning residue outlet. The supply system includes an electrical control device.

The utility model discloses an energy-saving high-speed press hydraulic system, and belongs to the technical field of hydraulic systems. Aiming at the problems of low punching speed and high energy consumption of a traditional press hydraulic system, the system provides an energy-saving and efficient scheme integrating servo motor driving, a bag type energy accumulator and multi-stage valve control. The core of the hydraulic system comprises a vertical pushing and lifting oil cylinder, a hydraulic oil pump driven by a servo motor, a Y-shaped meso-position function electro-hydraulic reversing valve, an H-shaped electromagnetic reversing valve, a bag type energy accumulator and an electric valve, wherein the bag type energy accumulator and the electric valve are connected through a bridge type oil pipe. According to the system, energy is stored in the piston rod recovery stage through the energy accumulator, oil is supplied cooperatively with the hydraulic pump during stamping, and high-flow output under low power is achieved. In addition, the safety and the stability of system operation are guaranteed through multi-stage safety valves, pressure sensors and oil filtering / cooling devices on the main oil pipe and the branch oil pipes. According to the design, the punching speed is remarkably increased, energy consumption is reduced, and the device is suitable for intermittent high-speed punching scenes and has high efficiency and energy saving performance.

The application discloses a kind of molten salt anti-blocking self-cleaning heat exchanger, including shell side shell, head mechanism, tube side assembly, reversing valve assembly and control module, the molten salt inlet and molten salt outlet are matched and arranged on the shell side shell;The head mechanism is arranged in the end of shell, and the shunt assembly is arranged in the inside of head mechanism, and the inside of head mechanism is divided into four independent first water inlet cavity, second water inlet cavity, first drain cavity and second drain cavity;The tube side assembly includes multiple heat exchange pipes arranged in the shell side shell, and two independent heat exchange channels are arranged in each heat exchange pipe, and the water inlet end of two heat exchange channels in the same heat exchange pipe is communicated with first water inlet cavity and second water inlet cavity respectively;The application is improved on the structure of existing horizontal tube shell heat exchanger, and the design is ingenious, can effectively solve the problem that the existing molten salt heat exchanger tube wall is easy to crystallize and block, and the self-cleaning energy consumption is high and the effect is poor, improves equipment running stability, adapts high-temperature molten salt heat exchange scene.

This invention provides a hydraulic control system for a concrete placing boom, comprising a hydraulic oil tank, an oil supply pump unit, a main hydraulic pressure pipeline, a main return hydraulic pipeline, and at least one hydraulic actuator unit. The oil supply pump unit is located on the main hydraulic pressure pipeline. Each hydraulic actuator unit includes a hydraulic cylinder and a control valve assembly. The control valve assembly is located close to the hydraulic cylinder, or integrated onto the hydraulic cylinder. The control valve assembly includes a main directional valve, a standby directional valve, and a balance valve assembly. The inlet ports of the main directional valve and the standby directional valve are respectively connected to the main hydraulic pressure pipeline. The return ports of the main directional valve and the standby directional valve are respectively connected to the main return hydraulic pipeline. The outlet ports of the main directional valve and the standby directional valve are respectively connected to the hydraulic cylinder via the balance valve assembly. This invention also provides a control method for the hydraulic control system of the concrete placing boom and a concrete placing boom device.

The invention provides a compaction control system of a heat treatment furnace door, which comprises a mechanical structure and software control, the mechanical structure comprises six hinge mounting seats mounted on the outer side of a furnace chamber, and the six hinge mounting seats are respectively arranged on the upper, middle and lower parts of the left and right sides of the furnace chamber; an air cylinder and a curved surface pressing block mechanism are installed on each hinge installation base, the air cylinders move to drive the curved surface pressing block mechanisms to do curvilinear motion, and rolling bearings are symmetrically installed on each curved surface pressing block mechanism in the axial direction; a metal protection plate is installed at the corresponding position of the furnace door, when an air cylinder moves forwards or backwards, a pressing block on a curved surface pressing block mechanism is driven to do curvilinear motion, the furnace door is pressed through a rolling bearing, and the rolling bearing makes rolling motion after making contact with the metal protection plate. Software control adopts synchronous action control of six air cylinder systems on the left side and the right side, air supply and exhaust of air cylinders are independently controlled through middle-sealed type electromagnetic reversing valves respectively, and the air cylinders adjust clamping blocks to act synchronously through precise exhaust throttling valves.

This invention relates to the field of directional valve technology, specifically a miniature explosion-proof pneumatic directional valve with a redundant anti-jamming structure. It includes a housing with an internal air passage, a valve stem slidably disposed within the housing, a pneumatic piston connected to one end of the valve stem for driving the valve stem to reciprocate, a valve core slidably mounted on the valve stem and located within the air passage, and an anti-jamming component connected between the valve stem and the valve core. This component includes a positioning disc fixedly connected to the surface of the valve stem and an energy storage spring sleeved outside the valve stem, with both ends of the energy storage spring abutting against the positioning disc and the valve stem, respectively. When the valve core jams within the air passage, the valve stem can overcome the resistance of the anti-jamming component and continue moving relative to the valve core, allowing the anti-jamming component to store energy. When the stored energy reaches a threshold, the anti-jamming component releases the energy to drive the valve core to generate an impact motion.

The application discloses a pneumatic reversing valve for natural gas, and belongs to the technical field of valves, which comprises an actuator, a valve and a valve rod, one end of the valve rod is rotationally connected in the actuator, the other end is located in the interior of the valve, and the valve and the actuator are connected through a plurality of bidirectional screw rods. When the application is used, the push wheel drives the plug body to move to the right, at this time, the plug body is inserted into the transition channel corresponding to the second interface, thereby completing the plugging of the second interface, at this time, the gas sleeve is extruded to generate wrinkles, the wrinkles of the gas sleeve can block the edge of the transition channel, thereby further increasing the sealing performance, the deeper the plug body enters the transition channel, the greater the wrinkles of the gas sleeve, and the sealing performance is further increased, the rotation angle of the push wheel is controlled to control the stroke of the plug body, thereby controlling the depth of the plug body entering the transition channel, so that the air tightness adjustment is more convenient.

The utility model discloses a kind of selectable valve core reset device, access oil pressure control system and emergency shutdown valve hydraulic control system, and is equipped with three oil paths: the first two access oil tank of oil pressure control system, the third access its oil pressure accumulator, dry road is equipped with electric valve and has multiple branch lines afterwards.Device contains switch control valve, auxiliary booster mechanism, hydraulic feedback mechanism, double filter, digital valve, proportional valve, proportional digital switching valve, auxiliary switching valve, two hydraulic control reversing valves and two travel switches, etc., and is connected into complete control and execution system by pipeline.It can be switched digital valve and proportional valve control mode by proportional digital switching valve, adapt to different working conditions;With hydraulic control reversing valve and travel switch cooperation, realize oil path accurate control and valve core reset monitoring feedback, improve accuracy;It is also equipped with main matching position sensor, manual valve etc., enhance system stability and controllability, can guarantee valve core reset reliable under complex working condition, improve oil pressure pump oil conveying system overall efficiency and reliability.

The utility model relates to a kind of high-precision self-adapting cold-rolled strip steel uncoiling and threading device hydraulic system, including swing oil cylinder, proportional reversing valve and proportional pressure reducing valve, interface one and interface two on proportional reversing valve are communicated and interface three and interface four are communicated, or interface one and interface three are communicated and interface two and interface four are communicated, proportional pressure reducing valve is equipped with interface five and interface six;Interface one is communicated with the one end of oil supply pipeline, interface two is communicated with the rodless cavity of swing oil cylinder by pipeline, interface three is communicated with the rod cavity of swing oil cylinder by pipeline, and the pipeline communicated between interface three and swing oil cylinder is equipped with plug-in check valve;Interface four is communicated with the one end of oil return pipeline, interface five and interface six are communicated with the pipeline communicated between interface three and swing oil cylinder by pipeline respectively.The high-precision hydraulic system provided by the utility model can avoid fatigue damage of equipment fittings caused by inertia and impact force when equipment suddenly stops, and can reduce labor cost and safety hazard.

The utility model relates to the technical field of drying and refrigerating, in particular to a low-carbon drying and refrigerating all-in-one machine which comprises an air source heat pump module, an energy storage module connected with the air source heat pump module and a working cavity connected with the energy storage module. The air source heat pump module comprises a fluid separator, a compressor connected with an outlet of the fluid separator, a four-way reversing valve connected with an outlet of the compressor, a first heat exchanger and a second heat exchanger, wherein the first heat exchanger and the second heat exchanger are connected with the four-way reversing valve. Wherein the compressor, the fluid separator, the first heat exchanger and the second heat exchanger are respectively connected with different ports of the four-way reversing valve; the energy storage module comprises an energy storage tank with an inlet connected with the first heat exchanger, a pump connected with an outlet of the energy storage tank, and a third heat exchanger connected with the pump. The third heat exchanger is also connected with the first heat exchanger; and the working chamber is connected with the third heat exchanger through a recovery pipeline.

A heat pump system includes an outdoor unit, an indoor unit, and a sealed system coupled between the outdoor unit and the indoor unit to circulate refrigerant through an indoor heat exchanger of the indoor unit and an outdoor heat exchanger of the outdoor unit. The sealed system includes a reversing valve to selectively reverse flow direction of the refrigerant. A method of operating the heat pump system may include, and / or a controller of the heat pump system may be configured for, measuring an ambient condition of an outdoor environment around the outdoor unit and determining a termination criterion for a defrost operation based on the measured ambient condition. The defrost operation is exited when the determined termination criterion is satisfied.

The utility model relates to the technical field of dumper equipment, in particular to an electro-hydraulic single-control reversing valve which comprises a valve body and a valve element, the valve element is arranged in the valve body, a high-pressure cavity, a lifting cavity, an oil return cavity and a pressure relief cavity are formed in the two sides of the valve element in a boss type, and the valve element is arranged in the valve body. A spring washer, a reset spring and a right end cover are arranged at the right end of the valve element, a pressure measuring plug is arranged in the middle of the right end cover, the right end cover is fixedly connected with the valve body through a bolt, a sealing rubber ring is arranged between the right end cover and the valve body, and a right spring cavity is formed in the position of the reset spring. The one-way valve and the pre-pressing valve are arranged in the valve body, working pressure is provided for the electro-hydraulic reversing valve, the action of the valve body lies in integration of multiple hydraulic elements of the large-flow electro-hydraulic reversing valve, the risk of oil leakage is reduced, the structure is more compact, the size is small, the weight is light, machining is convenient, the reversing response speed is high, response is sensitive, and the reliability of the reversing valve is improved.

The application discloses an adjustable clothes drying system, which comprises a compressor, a condenser and an evaporator connected in sequence, a first reversing valve is arranged between the condenser and the evaporator, a first gas outlet valve port of the first reversing valve is directly communicated with the compressor through a first passage, a second gas outlet valve port of the first reversing valve is communicated with the compressor through a second passage, the evaporator is arranged on the second passage, and the first reversing valve can control the refrigerant in the adjustable clothes drying system to flow in one of the first passage and the second passage; the application further discloses a control method of the system and drying equipment applying the system and the method. The refrigerant flow path in the compressor system is adjusted by controlling the reversing valve, the refrigerant does not flow through the evaporator in the initial state of the machine starting, the temperature in the system can be rapidly increased, the reversing valve is actuated when the temperature of the machine reaches a certain degree, the main drying stage is entered, and the overall operation time is shortened.

The invention discloses an injection molding machine oil cylinder ejection mechanism and a control method thereof. The injection molding machine oil cylinder ejection mechanism comprises a power unit; the small oil cylinder assembly and the large oil cylinder assembly are arranged on the rear side of the machine plate, the small oil cylinder assembly is provided with at least one small oil cylinder, and the large oil cylinder assembly is provided with at least one large oil cylinder; a piston rod of the small oil cylinder assembly is fixedly connected with the ejector pin push plate; the large oil cylinder assembly is a one-way oil cylinder, the front end of a piston rod of the large oil cylinder assembly makes contact with the ejector pin push plate but is not fixed, and a reset spring is arranged in a rod cavity of the large oil cylinder assembly. The first electromagnetic directional valve is used for controlling oil inlet and outlet of the small oil cylinder assembly; the second electromagnetic directional valve is used for controlling oil inlet and outlet of the large oil cylinder assembly; wherein the power unit is connected with the small oil cylinder assembly through a first electromagnetic reversing valve pipeline, and the power unit is connected with the large oil cylinder assembly through a second electromagnetic reversing valve pipeline. According to the injection molding machine oil cylinder ejection mechanism and the control method thereof, the structure is simple, the occupied space is small, and the cost is low; and large ejection force and rapid ejection action in the later period can be realized in the early demolding stage.

The invention discloses a loader and a double-pump two-way interchange energy recovery system of a movable arm oil cylinder of the loader, and relates to the technical field of hydraulic drive of loaders. The system comprises a two-position four-way electromagnetic directional valve, a three-position four-way electromagnetic directional valve, a hydraulic energy accumulator, a third two-position two-way electromagnetic directional valve connected to the hydraulic energy accumulator, a first pump motor, a second pump motor, a first motor and a second motor, wherein oil inlets of the first pump motor and the second pump motor are connected to a hydraulic oil tank, and the first motor and the second motor are in transmission connection with the first pump motor and the second pump motor respectively. The hydraulic oil cylinder is provided with a rodless cavity and a rod cavity, and the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve are connected to the rod cavity and the rodless cavity respectively; and the two-position four-way electromagnetic directional valve is used for communicating oil outlets of the first pump motor and the second pump motor with the first two-position two-way electromagnetic directional valve and the second two-position two-way electromagnetic directional valve respectively. And the three-position four-way electromagnetic directional valve is used for switching and communicating the third two-position two-way electromagnetic directional valve with the rodless cavity, the rod cavity and an oil inlet of the first pump motor.

A hydraulic system for a sand making machine and its start-up adjustment method are disclosed, relating to the technical field of sand making machine equipment. The hydraulic system includes an oil tank, a hydraulic pump, a hydraulic control valve group, an accumulator valve platform, and a hydraulic cylinder. The hydraulic control valve group includes a solenoid directional valve for controlling the extension or retraction of the piston rod of the hydraulic cylinder, and a hydraulically controlled check valve for maintaining pressure after the rod chamber of the hydraulic cylinder is filled. The accumulator valve platform includes a rodless chamber circuit, a rod chamber circuit, and an accumulator, which is located on the rod chamber circuit and is used for pressure maintenance and overpressure protection. The start-up adjustment method includes: 1. Pressurizing the rod chamber of the hydraulic cylinder and the accumulator; 2. The accumulator is used for pressure maintenance and overpressure protection; 3. Pressurizing when the pressure drops during sand making machine operation and depressurizing when the pressure is too high; 4. Depressurizing before stopping the machine; 5. Retracting the moving roller during maintenance. This invention can solve the technical problems of existing sand making machines, such as large vibration, frequent start-stop, short lifespan, lack of standardization, and easy oil contamination.

The heat source unit (10) includes a first reversing valve (35) that switches between a first state in which a high-low pressure gas connection pipe (3) is connected to a discharge side of a compressor (11) and a second state in which the high-low pressure gas connection pipe (3) is connected to a suction side of the compressor (11), and a second reversing valve (36) that switches between a third state in which the discharge side of the compressor (11) is connected to a gas-side end of a first heat exchange portion (21) and the suction side of the compressor (11) is connected to a gas-side end of a second heat exchange portion (22), and a fourth state in which the discharge side of the compressor (11) is connected to the gas-side end of the second heat exchange portion (22) and the suction side of the compressor (11) is connected to the gas-side end of the first heat exchange portion (21).

A booster-type volumetric distributor includes a distributor body with a main oil circuit connected to an oil pump. Several booster metering structures, each connected to the main oil circuit, are arranged in parallel within the distributor body. Each booster metering structure includes a metering discharge channel formed in the distributor body and connected to the main oil circuit, and an oil outlet connector fixedly connected to the port of the metering discharge channel. The metering discharge channel sequentially includes an inlet orifice, a reversing channel, and a piston channel. A reversing valve assembly is located within the reversing channel. A valve stem and a piston assembly fitted over the valve stem are located within the piston channel. The valve stem has an axially penetrating interior, with a valve hole at the end of the valve stem away from the oil outlet connector and at least one discharge hole on the side of the end closest to the oil outlet connector. The two ends of the reversing valve assembly correspond to the inlet orifice and the valve hole, respectively. This invention integrates the booster metering structure into the distributor, giving the distributor a built-in booster metering function, simplifying the structure of the lubrication system, and improving assembly efficiency.

The application discloses a starting device for a marine methanol engine, which comprises a compressed air control unit, a compressed air starting unit, a supplementary combustion unit, a rotating speed signal sensor and a plurality of Hall sensors. The compressed air control unit comprises a pressure reducing valve, a first one-way valve and a first electromagnetic reversing valve. The compressed air starting unit comprises a first electromagnetic on-off valve, a second electromagnetic reversing valve, a first pneumatic reversing valve, a second one-way valve, a second pneumatic reversing valve and a silencer. The supplementary combustion unit comprises a second electromagnetic on-off valve, a common rail pipe, a supplementary combustion gas injection valve, a third one-way valve and a third electromagnetic on-off valve. The starting device can quickly realize the cold state starting and the hot state starting of the marine methanol engine by using a small number of valve combinations, has high automation degree and good integration degree, and conveniently and efficiently solves the difficult starting problem of the marine methanol fuel engine.

The invention relates to the technical field of testing, and provides an actuator loading testing device which comprises a hydraulic oil cylinder, a reversing valve, a hydraulic pump, a motor, a first ball valve, a second ball valve, a proportional overflow valve, an electromagnetic overflow valve and a controller. The controller is used for controlling the first ball valve, the second ball valve, the reversing valve, the electromagnetic overflow valve or the proportional overflow valve according to the oil inlet and outlet pressure of the first cavity A and the second cavity B of the hydraulic oil cylinder so as to test the actuator. The device not only can carry out a tension test of the actuator, but also can carry out a thrust test of the actuator, not only can carry out a variable and constant load test of the actuator, but also can keep the load force unchanged when the actuator moves so as to carry out a constant load test of the actuator and cover a full working condition test of the actuator, and the whole device is loaded by a hydraulic system, so that the test efficiency is improved. High load can be obtained by increasing system pressure, and the whole device is safe and reliable.

The invention discloses a rope saw hydraulic system controlled by a proportional valve, and belongs to the technical field of rope saw hydraulic control. Comprising an oil tank, a first filter part, a first motor, a first hydraulic pump, a first one-way valve, a second one-way valve, a temperature sensor, an oil return filter, an air cooler, a first proportional valve, a second proportional valve, a first pressure sensor, a second pressure sensor, a second motor, a second filter part, a second hydraulic pump, a liquid level sensor, an air filter, an electric proportional reversing valve, an electromagnetic ball valve, an energy accumulator and a tensioning oil cylinder. The second motor is in transmission connection with a second hydraulic pump, an oil inlet of the second hydraulic pump is communicated with the oil tank through a second filter part, an oil outlet of the second hydraulic pump is communicated with an oil inlet of a second proportional valve, and an oil outlet of the second proportional valve is communicated with an oil inlet of an electric proportional reversing valve. The rope sawing machine hydraulic system controlled by the proportional valve has the beneficial effect that the sawing rope is prevented from being broken.

The indexing chuck comprises a chuck body and a hydraulic pump station, the upper side and the lower side of the chuck body are provided with a pressing oil cylinder and an indexing plate respectively, a positioning oil cylinder, a 45-degree oil cylinder and a 90-degree oil cylinder are further installed in the chuck body, and a diverter valve is arranged at an outlet of the hydraulic pump station. The outlet end of the diverter valve is respectively connected with a pressing oil way, a positioning oil way and an indexing oil way, the indexing oil way comprises a three-position four-way electromagnetic directional valve A connected with the diverter valve, the left position and the right position of the three-position four-way electromagnetic directional valve A are respectively connected with a 45-degree oil way and a 90-degree oil way, the 90-degree oil way is connected with a synchronous oil cylinder in series, and the synchronous oil cylinder is connected with a hydraulic cylinder. A feedback piece is arranged on the front side of the movable end of the synchronous oil cylinder, the feedback piece is in communication connection with a lathe control system, and when the 90-degree oil cylinder completes the steering stroke, the feedback piece sends a signal to the lathe control system. According to the utility model, the synchronous oil cylinder is arranged to simulate the working state of the 90-degree oil cylinder in the disc body, so that the phenomena of cutter damage, product scrapping and machine tool damage in the machining process are avoided.

The utility model relates to a kind of online backwash ceramic filter tank systems.Electromagnetic reversing valve and electromagnetic stop valve are set up one-to-one with each suction tube, two openings of each electromagnetic reversing valve are connected with suction tube, another opening is connected with the import of suction pump, with the first valve position of liquid in suction pump flowing to suction tube, and the second valve position of reverse flow;Electromagnetic stop valve includes the import of acid outlet connected with pickling pump and the outlet of acid outlet connected with corresponding suction tube, with opening valve position and closing valve position;Controller is controlled connection with suction pump, pickling pump, each electromagnetic reversing valve and each electromagnetic stop valve respectively, to control at least one carbon ceramic filter plate in backwash state, corresponding electromagnetic reversing valve switches to first valve position, corresponding electromagnetic stop valve is opening valve position;Control at least one ceramic filter plate in filtration state, corresponding electromagnetic reversing valve switches to second valve position, corresponding electromagnetic stop valve is closing valve position.On-line high-efficiency backwash can be achieved.