5172 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 embodiment of the invention provides an air supply system and an air supply method of an air suspension. The air supply system of the air suspension comprises an air storage tank, a plurality of air springs, an air supply valve body unit, a dryer, a heating element, an electronic control unit and a humidity sensor. The air storage tank is used for storing compressed air; the air spring is used for inputting high-pressure gas to each wheel of the vehicle; the air supply valve body unit comprises a reversing valve; the reversing valve is arranged on an air channel, so that the air supply system is driven to be switched between the air suction mode and the reverse blowing mode through reversing of the reversing valve; the cavity of the dryer is communicated with the air supply valve body unit through an air channel; the heating element is arranged in a cavity of the dryer, the humidity sensor is arranged on the air channel, and the humidity sensor corresponds to the electronic control unit in a signal mode. Therefore, the air supply system of the air suspension has the advantage that the regeneration efficiency of the dryer is improved.

The invention relates to the technical field of electric vehicle power battery thermal management, and discloses a temperature change-based power battery thermal management system, which comprises a thermal simulation pre-judgment end, a sensor network end, a dynamic liquid cooling control end, a BMS decision end and a fault diagnosis module, aiming at the technical defects of out-of-control temperature difference, response hysteresis and leakage risk caused by static flow channel design of the existing liquid cooling system, breakthrough is realized through a three-dimensional technical architecture: a CFD (Computational Fluid Dynamics) prejudgment layer: automatically calibrating sensor distribution points based on temperature field standard deviation, and improving temperature difference identification precision; according to the dynamic valve control layer, an electromagnetic three-way reversing valve is adopted to execute a directional temperature control strategy, an edge battery cell is preferentially introduced under the low-temperature working condition, and heat dissipation is enhanced under the high-temperature working condition; according to the redundant safety layer, the valve body and the pipeline are integrally formed, the leakage rate is reduced, and flow maintenance under single-point failure is achieved through a double-water-inlet parallel pump source. The method has the effects of improving the convergence speed of temperature difference between modules, reducing the attenuation rate of battery life and reducing the risk probability of thermal runaway.

The invention provides an automatic judgment device for a safety valve and a verification method, and relates to the technical field of safety valve verification. The automatic judgment device comprises clamping seats which are provided with an air inlet valve and a pressure release valve, are arranged at intervals along a first horizontal direction and are used for fixing a safety valve to be tested, the translation assembly comprises a connecting piece, and the end part of the connecting piece is provided with a sealing plate matched with the safety valve to be tested for sealing; the reversing valve is arranged to be communicated with an outlet of the safety valve to be tested and alternatively communicated with the flow sensor or the bubble meter, and the adjusting piece of the adjusting assembly is arranged to drive the sealing plate to adjust the preset angle until the sealing plate is sealed with the safety valve to be tested, and the limiting piece is controlled to move to abut against the sealing plate. The first driving mechanism is arranged to drive the sealing plate to move to selectively seal the safety valve to be tested so as to verify the setting pressure or the sealing performance of the safety valve to be tested. According to the automatic judgment device, the angle of the sealing plate can be adjusted, so that the sealing performance is improved, and the stability of the sealing plate is guaranteed.

The invention discloses a hydraulic system and equipment for testing a hydraulic valve, and belongs to the technical field of hydraulic systems. An oil inlet of the hydraulic pump is connected with the oil tank; the tested valve comprises a plurality of inlets and outlets; one oil way of an oil outlet of the hydraulic pump is connected with the pressure regulating oil way, and the other oil way is connected with an oil inlet of the cartridge check valve; the pressure adjusting oil way adjusts the oil outlet pressure of the hydraulic pump; one oil way inserted into the oil outlet of the one-way valve is connected with a control oil way; the control oil way is used for adjusting the on-off and pressure of control oil of the tested valve; the other oil way is connected with an oil inlet of a proportional speed regulating valve, an oil outlet of the proportional speed regulating valve is connected with an oil inlet of a plug-in mounting type direction valve group, an oil outlet of the plug-in mounting type direction valve group is connected with an inlet of a tested valve, and a control cavity of the plug-in mounting type direction valve group is connected with an electromagnetic directional valve; an outlet of the tested valve is connected with the hydraulic cylinder and the throttling oil way. The hydraulic valve testing device can be suitable for testing high-pressure environments of various types of hydraulic valves.

The invention discloses a double-variable power source hydraulic system of a movable arm of an electric loader and a control method, and belongs to the technical field of energy conservation of electric engineering machinery. The hydraulic system is structurally characterized in that a permanent magnet synchronous servo motor and an electro-hydraulic proportional variable device form a double-variable power source direct drive arm hydraulic cylinder; the one-way valve achieves oil cylinder and motor oil supplementing and flow reappearing functions according to the working condition of a hydraulic cylinder, the direct-acting overflow valve achieves overflow protection of a hydraulic system, and the two-position two-way electromagnetic directional valve achieves the pressure maintaining function of the hydraulic cylinder. According to the control method of the hydraulic system configuration, an upper computer outputs a target instruction to a double-variable parameter optimization controller, then the double-variable parameter optimization controller outputs an optimization rotating speed or displacement signal to a motor pump set, and a pump outlet pressure sensor feeds back a pressure signal to achieve a pressure closed loop. The energy recovery function can be effectively achieved in the aspect of configuration, the energy efficiency characteristic of a power source can be greatly improved in the aspect of a control method, and the endurance time of the electric loader is effectively prolonged.

The invention relates to the technical field of valves, and provides a water pump control valve with a downstream pipe burst emergency shutoff function, which comprises a main valve body with a water inlet port and a water outlet port, and further comprises a control cavity, and the control cavity comprises an upstream control cavity and a downstream control cavity; the water pump control valve further comprises a reset reversing valve and a turn-off reversing valve, the reset reversing valve comprises an upstream pressure collecting end, a first downstream pressure collecting end, a first reversing pressure collecting end and a drainage end, and the turn-off reversing valve comprises an upstream pressure output end, a second downstream pressure collecting end, a second reversing pressure collecting end and a downstream pressure output end. The reset reversing valve and the turn-off reversing valve selectively enable the control cavity to be in a dynamic adjusting state or a rapid turn-off state according to the pressure of the first reversing pressure collecting end and the pressure of the second reversing pressure collecting end respectively. By means of the technical scheme, the problem that in the prior art, a water pump control valve cannot meet the requirement for quick turn-off in emergency circumstances is solved.

The invention relates to the technical field of hydraulic control, and provides a pump-controlled semi-active ship heave compensation hydraulic system and a control method thereof.The system comprises an active compensation hydraulic module, a passive compensation hydraulic module, a sensor module, a controller and a motion sensor; the passive compensation hydraulic module comprises a nitrogen cylinder unit, an energy accumulator unit, a gas-liquid converter, a seventh electromagnetic directional valve, a fourth electromagnetic directional valve and a passive compensation asymmetric hydraulic cylinder; the active compensation hydraulic module comprises a third energy accumulator, a servo motor, a two-way quantitative hydraulic pump, a first one-way valve, a second one-way valve, an active compensation asymmetric hydraulic cylinder, a first electromagnetic reversing valve, a second electromagnetic reversing valve and a third electromagnetic reversing valve. According to the invention, passive compensation and active compensation are fused, so that the compensation precision and efficiency are greatly improved; and an electro-hydraulic servo pump control mode is adopted, so that the advantage of high control precision of a valve control mode is reserved, and the stability is also improved.

The utility model relates to the technical field of marine scientific investigation equipment, in particular to a winch emergency lowering and pressure compensation system which comprises a reversing valve, a winch assembly, a brake assembly and an emergency function assembly. The brake part is controlled by a brake assembly to brake the power motor, and two cavities of the power motor are communicated with the reversing valve to form a working loop. The emergency function assembly comprises an energy accumulator, a first stop valve, a hydraulic control valve and a speed regulating valve, the first stop valve, the hydraulic control valve and the speed regulating valve are sequentially communicated, the first stop valve and the speed regulating valve are correspondingly communicated with two cavities of the power motor to form an emergency lowering loop, and the energy accumulator is communicated with one cavity of the power motor through an energy storage oil way. The energy accumulator is further communicated with the two cavities of the power motor through a compensation oil way, the working loop and the compensation oil way are each provided with a control oil way for providing a control oil source for the brake assembly, and a second stop valve is arranged on the control oil way of the compensation oil way.

The invention relates to the technical field of liquid cooling heat dissipation, in particular to a liquid cooling distribution device, liquid cooling heat dissipation equipment and a liquid cooling control method. The liquid cooling distribution device comprises a main liquid supply collecting pipe, a flow adjusting assembly, a multi-channel liquid distribution assembly, a plurality of cooling medium conveying pipelines and a central control unit, a proportioning valve of the flow adjusting assembly is connected into the main liquid supply collecting pipe in parallel, and a liquid distributor of the multi-channel liquid distribution assembly is correspondingly connected with the proportioning valve. A parallel branch of the liquid separator is connected with the liquid outlet node through the reversing valve, and the two ends of the cooling medium conveying pipeline are connected with the liquid outlet node and target heat dissipation equipment respectively; the central control unit achieves accurate distribution and dynamic adjustment of the flow of the cooling liquid by controlling the proportion adjusting valve and the reversing valve, the problem of uneven flow distribution caused by pipeline resistance difference is solved, the flow can be adjusted according to real-time heat loads, and system energy consumption is optimized.

The invention relates to an insert positioning detection mechanism and an automobile skylight framework plastic part injection mold thereof, the insert positioning detection mechanism comprises an insert, a positioning rod, a reversing valve, a second negative pressure mechanism, a positive pressure mechanism and a switching control assembly, the insert is detachably connected to a movable mold, the positioning rod is fixedly arranged on the insert, and the insert sleeves the positioning rod; the reversing valve is provided with an outlet, a first inlet and a second inlet, the first inlet communicates with the positive pressure mechanism, and the second inlet communicates with the second negative pressure mechanism; an air channel penetrates through the insert, one end of the air channel directly faces the insert, and the other end of the air channel is communicated with an outlet of the reversing valve; the switching control assembly is used for detecting whether the insert is installed correctly or not and controlling reversing of the reversing valve. When no insert is installed or the insert is installed correctly, the state of adsorbing the insert can be kept; and when the insert is reversely mounted, the outlet switch is communicated with the first inlet, and the positive pressure mechanism acts in the air channel at the moment, so that the insert can be automatically blown out of the positioning rod.

The detachable reactor comprises a water supply pipe, a communicating pipe and a plurality of barrel sets, each barrel set is formed by splicing a top cover, an upper barrel, an upper grating net, a main barrel, a lower grating net, a lower barrel and a bottom cover, and the bottom cover is connected with a water inlet pipe, a water drainage pipe and a series connection pipe through a first reversing valve; the top cover is provided with a water outlet pipe with a valve and flushing pipes, the water supply pipe is provided with a water supply pump and a box body, the box body is provided with a sewage pipe and a dosing mechanism, the communicating pipe is communicated with the series connection pipes and the flushing pipes and provided with a second reversing valve, inner cavities of the upper cylinder and the lower cylinder are filled with filter materials, and an inner cavity of the main cylinder is filled with catalytic filler. Sewage is filtered and catalytically decomposed by using the filter material and the catalytic filler in the cylinder group, the cylinder group is convenient to disassemble for cleaning and replacement, and series connection, parallel connection and backwashing work of the plurality of cylinder groups can be realized through cooperation of each pipeline and each valve, so that the sewage treatment effect is ensured, and the sewage treatment efficiency is improved.

The invention provides an extension method and system for a driving chassis axle. The method comprises a normal extension mode, a resistance-meeting extension mode, a limit extension mode and a free extension mode. In the normal expansion mode process, when the pressure value of the expansion oil cylinder encounters obstacles and exceeds the set pressure of the system, the expansion oil cylinder is switched to the resistance expansion mode, after the expansion oil cylinder passes through the swing wheels, the pressure value is decreased, bridge expansion continues, and if the pressure value is not decreased, the expansion oil cylinder is switched to the limit expansion mode. The free expansion mode is that at least one wheel or axle is manually controlled by operating an equipment panel; the system comprises electromagnetic directional valves arranged on hydraulic pipelines of wheels and axles, corresponding balance valves and hydraulic locks, compensation valves are arranged between the electromagnetic directional valves and a main oil inlet pipeline, first overflow valves with the pressure value smaller than that of second overflow valves are arranged at the two ends of the electromagnetic directional valves at the extension bridge end, and graded protection is achieved. Through each single-control valve group and matched control logic, automatic de-trapping and successful bridge expansion in a limited area are realized.

Disclosed is a hydraulic control system for safe rapid opening or closing of a valve. The hydraulic control system comprises a hydraulic cylinder (71), a pressure oil line (141), an oil return line (151), an oil drain line (161), a quick oil return line (171) and a valve manifold (181), wherein the inside of the valve manifold is provided with a three-position four-way directional control valve (51), a bidirectional hydraulic lock (31), a first two-position four-way directional control valve (61) and an energy accumulator (191); a first cartridge valve (101) is connected between the oil drain line and a rod cavity of the hydraulic cylinder, and a pilot port of the first cartridge valve is connected to a port A of the first two-position four-way valve; an oil inlet of the energy accumulator is connected to each of the pressure oil line and the oil return line, a first check valve (81) is connected between the oil inlet of the energy accumulator and the pressure oil line, and a second cartridge valve (102) is connected between the first check valve and the energy accumulator; and the second cartridge valve is connected to a rodless cavity of the hydraulic cylinder, and a pilot port of the second cartridge valve is connected to the port A of the first two-position four-way directional control valve. The hydraulic control system for safe rapid opening or closing of a valve allows for safe rapid opening or closing of a valve.

The invention discloses a load simulation loading system based on an engineering mechanical power system and a control method thereof, and relates to the technical field of mechanical power system simulation. The load simulation loading system comprises an engineering machinery power system, a load loading system, a whole vehicle control unit and an upper computer platform. The engineering machinery power system comprises a first oil tank, a main pump, a pilot pump, a pilot control handle, a signal control valve and a multi-way valve. The load loading system comprises a three-position four-way reversing valve, a proportional overflow valve, a first proportional throttle valve, a second proportional throttle valve, an electromagnetic valve, a third proportional throttle valve and a variable pump, wherein the three-position four-way reversing valve, the proportional overflow valve and the first proportional throttle valve are connected to the multi-way valve, the second proportional throttle valve and the electromagnetic valve are connected to an outlet of the proportional overflow valve, and the third proportional throttle valve is connected between the second proportional throttle valve and the second oil tank. And the three-position four-way reversing valve is constructed to enable an inlet of the proportional overflow valve to be communicated with one of the oil port A and the oil port B of the multi-way valve in a switching manner, and an outlet of the proportional overflow valve to be communicated with the other one of the oil port A and the oil port B in a switching manner.

A constant-flow control valve group, an auxiliary arm control module, a complete hydraulic system, and a crane. The constant-flow control valve group comprises: a cartridge valve; a cartridge reversing valve, comprising a working oil port on one side and a main oil return port and a reversing valve oil inlet selectively connected to the working oil port on the other side, the working oil port being connected to a control oil port of the cartridge valve, and the reversing valve oil inlet being connected to a main oil inlet of the cartridge valve; and a feedback on-off valve, disposed in a working feedback oil path connected between the main oil inlet of the cartridge valve and a main feedback oil port of the constant-flow control valve group. The auxiliary arm control module comprises the constant-flow control valve group and a main reversing valve. The complete hydraulic system comprises the auxiliary arm control module and an auxiliary arm luffing cylinder, and may further comprise a load-sensitive oil pump and a main valve. The present application can achieve the effect of directly connecting an auxiliary arm hydraulic system to an existing complete hydraulic system as a sub-module without altering the original system.

The invention relates to the technical field of hydraulic pressure, and discloses an oil cylinder for an oil press, a hydraulic system of the oil cylinder and a pressurizing method, a protection frame is additionally arranged outside the oil cylinder, vibration under the working condition of high-speed movement or extreme pressure can be reduced, and the oil cylinder is prevented from being damaged or deformed; the multi-pump system transmits hydraulic oil of a hydraulic oil tank to the lifting module through an oil supply pipeline, the lifting module conducts overflow pressure stabilization on the hydraulic oil and then transmits the hydraulic oil to the station oil cylinder, and therefore the station oil cylinder stretches out and draws back to adjust the position of the oil press. The multi-pump system transmits hydraulic oil of a hydraulic oil tank to an energy accumulator for pressurization through a pressurization pipeline, pressure regulation is conducted through a pressure regulation one-way throttle valve, then pressure stabilization is conducted through a pressure regulation piezoelectric hydraulic reversing valve and a pressure regulation hydraulic control one-way valve, and finally the hydraulic oil flows into a light-pressure station oil cylinder or a heavy-pressure station oil cylinder through the pressurization pipeline. Therefore, the hydraulic pressure output of the oil press is improved, the same oil press can process various different work tasks, and the universality and adaptability of equipment are improved.

The invention discloses a shackle hydraulic system for an underground drill rig and a control method. The shackle hydraulic system is provided with an oil tank and a main oil pump; the rotary motor oil way and the feeding oil cylinder oil way are communicated with the main oil pump; proportional directional valves for controlling the transmission direction of hydraulic oil are arranged on an oil inlet path and an oil return path of the rotary motor oil path; the oil inlet path and the oil return path are respectively connected between the proportional directional valves and the rotary motor; a high-pressure selection valve is arranged in the oil path; the hydraulic control reversing valves are arranged on an oil inlet way and an oil return way of the oil way of the feeding oil cylinder, and the two-position two-way valves are arranged on the oil inlet way and the oil return way respectively. And the high-pressure selection valve is respectively and hydraulically communicated with the hydraulic control reversing valve and the two-position two-way valve to control the opening and closing of the hydraulic control reversing valve and the two-position two-way valve. The problem that the drill rod is easily damaged due to the fact that the feeding speed and the rotating speed are not matched during screwing on and screwing off of the drill rod is solved through accurate control of the hydraulic system, meanwhile, the automation level of the drilling machine is improved, and the labor intensity of workers is relieved.

The invention discloses a solar energy-phase change heat storage collaborative parallel evaporator segmented defrosting system and method, and belongs to the technical field of air source heat pump defrosting and new energy utilization. Comprising evaporator sets (A / B) arranged in parallel, a compressor, a condenser, a four-way reversing valve, a solar heat collecting plate, an electromagnetic valve, a temperature sensor and a connecting pipeline. A phase change material interlayer is embedded in a finned tube of the evaporator set, the phase change material is connected with the solar heat collection plate through a circulation pipeline, the phase change material absorbs or releases a large amount of latent heat in the solid-liquid phase change process, and heat collected by the solar heat collection plate is stored in a high-density mode. When the evaporator is frosted, heat stored by the phase change material can be released directionally, and melting of a frost layer is accelerated. Through the synergistic effect of solar energy and phase change heat storage, the defrosting time is remarkably shortened, indoor temperature fluctuation caused by reverse circulation is reduced, meanwhile, the energy utilization rate is increased, the structure is simple, the cost is controllable, and the efficient defrosting requirement of the air source heat pump in the cold region is met.

The utility model belongs to the technical field of reversing valves, and particularly relates to a pressure-adjustable automatic reversing valve which comprises a valve body, a rotating motor fixedly installed at one end of the valve body, a threaded rod arranged at one end of the rotating motor, a valve cavity formed in the valve body, a piston valve element arranged in the valve cavity, a threaded hole formed in one end of the piston valve element, and a groove formed in the outer side of the piston valve element. An oil return opening is formed in the bottom of the valve body, an inlet is formed in the valve body, and a first outlet is formed in one side of the inlet. The piston valve element is in sliding connection with the valve cavity, the piston valve element is provided with the two grooves, meanwhile, the rotating motor, the threaded rod and the threaded hole are matched for use, the rotating motor is driven to work, the threaded rod can be rotated to drive the piston valve element to conduct threaded sliding adjustment, and the piston valve element can conveniently move left and right; the inlet, the first outlet and the second outlet can be opened and closed, the flowing direction of a medium can be conveniently cut off, distributed and changed, the effect of changing a liquid flowing channel is achieved, and operation and use are convenient.

The invention relates to the technical field of valve bodies, and provides a pressure reducing valve with emergency shutoff and backflow prevention functions, which comprises a main valve body, a main valve membrane and a valve core assembly, the main valve body comprises a valve cavity with a water inlet end and a water outlet end, and the main valve membrane is arranged in the valve cavity and divides the valve cavity into a control cavity and an overflowing cavity; the pressure reducing valve is in a pressure reducing dynamic adjusting state, when the pressure reducing valve is in the pressure reducing dynamic adjusting state, the shut-off reversing valve changes the position so as to close the pressure reducing pilot valve to be communicated with the water outlet end, and the pressure reducing valve is switched to an emergency shut-off state so as to be closed. When the pressure reducing valve is in the pressure reducing dynamic adjusting state, the anti-backflow reversing valve changes the position to close communication between the water inlet end and the control cavity and enable the water outlet end to communicate with the control cavity, and the pressure reducing valve is switched to be in the anti-backflow state so as to be closed. The problem that in the prior art, downstream leakage or backflow of a traditional pressure reducing valve cannot be blocked in time is solved.

The utility model discloses an electro-hydraulic reversing valve which comprises a pilot electromagnetic valve and a main valve. The pilot electromagnetic valve is detachably connected with the main valve; after the pilot electromagnetic valve is connected with the main valve, an oil cavity in the pilot electromagnetic valve is communicated with an oil way in the main valve; a first pilot control oil way, a second pilot control oil way, an outer oil supply way, an inner oil supply way, an outer oil discharge way and an inner oil discharge way in the main valve are all casting oil ways, and the number of each oil port is two. The oil paths in the main valve are all formed through casting instead of auxiliary holes, so that the impact resistance of the oil paths can be improved, oil leakage at conical plugs of the auxiliary holes is avoided, the pressure loss of hydraulic oil flowing in the oil paths can be reduced, and the through-flow capacity of the hydraulic oil in the oil paths is improved.

The utility model provides an open-loop controlled multifunctional hydraulic pulse test bench, which comprises a storage oil tank, an oil supply pump machine, a reversing valve, a pressurizing oil cylinder and an oil supplementing overflow valve, according to the test bed, a large amount of oil flows into a system at the moment that an oil way is opened by a reversing valve, and due to the fact that an overflow valve has a lag phenomenon in response, oil pressure instantaneously generates an overshoot peak value, pressure in a pipeline rapidly rises and a pressure peak appears, then the overflow valve is conducted, the oil is guided out along the overflow valve, and the pressure in the system is reduced to the set pressure of the overflow valve; water hammer waves and rectangular waves of various waveforms and frequency bands can be generated by adjusting the diameter of a variable damping hole of the one-way throttle valve and the rotating speed of the motor, so that the hydraulic pulse test bed can form hydraulic pulse waveforms of various waveforms and frequency bands; the set pressure of the overflow valve is increased, meanwhile, the travel switch loses efficacy, and when the reversing valve is located at the right position all the time, a damage test can be conducted on the hydraulic pipeline to measure the maximum pressure value capable of being borne by a tested piece.

The utility model discloses a converter station resin replacement system based on the negative pressure jet principle, which comprises a booster pump, a reversing valve, a resin particle bin, an ion exchanger, a water suction pump and a particle recovery bin, an inlet of the booster pump is communicated with a water source through a first valve, and an outlet of the booster pump is communicated with an inlet of the reversing valve through a pipeline provided with a pressure gauge. An outlet of the reversing valve is communicated with an upper inlet of the ion converter through a first pipeline, the first pipeline is communicated with the resin particle bin through a pipeline provided with a second valve, a lower outlet of the ion converter is communicated with an inlet of the water suction pump through a second pipeline, and an outlet of the water suction pump is communicated with the particle recovery bin through a pipeline; most old resin particles are driven to be discharged out of the ion exchanger through high-speed jet flow, air in the new resin storage bin is taken away through the high-speed jet flow, negative pressure is formed to enable the new resin particles to be entrained and sucked into the pipeline, a mixture of the resin particles and water is conveyed into the ion exchanger, and filling of the new resin particles in the ion exchanger is achieved.

A winch hydraulic control system includes a hydraulic oil tank, a hydraulic pump, and an electric motor. The hydraulic pump's oil inlet is connected to the hydraulic oil tank, the electric motor is connected to the hydraulic pump, and the hydraulic pump's oil outlet is connected to both port P of the main reversing valve assembly and port P of the control valve assembly. Ports A and B of the main reversing valve assembly are connected to port A of the first shuttle valve, port A of the balancing valve assembly, and port B of the control valve assembly, respectively. Port X is connected to port B of the second solenoid reversing valve. Ports B and C of the first shuttle valve are connected to port B of the balancing valve assembly and port B of the second shuttle valve, respectively. A third pressure reducing valve is connected in parallel with the second solenoid valve. Port P of the second solenoid reversing valve is connected to port X of the control valve assembly, port A of the second shuttle valve, and port SP of the balancing valve assembly. Port C of the second shuttle valve is connected to the rod chamber of the brake. The brake is connected to the hydraulic motor, and the oil outlet of the control valve assembly is connected to the oil inlet of the balancing valve assembly. This design can maintain constant wire rope tension and stable operation.

The invention discloses a pulse-free hydraulic reciprocating fluid material conveying pump which comprises a pump body, a pulse adjusting assembly and a reversing valve. The pump body is connected with the two slurry cylinders, and slurry suction and discharge ports of the slurry cylinders are connected with the slurry suction and discharge valve assembly; a slurry suction port of the slurry suction and discharge valve assembly is connected with the main liquid inlet pipeline, and a slurry discharge port of the slurry suction and discharge valve assembly is connected with the main liquid discharge pipeline; a pulse adjusting assembly is arranged between the oil inlet pipe and the main liquid discharging pipeline, slurry discharging compensation is provided by arranging the pulse adjusting assembly when the oil cylinder is at a reversing point of reciprocating motion, the stability of the slurry discharging flow is guaranteed, and under the condition that a pressure reducing valve is arranged, blockage removing can be conducted on the slurry discharging pipeline by adjusting the pressure reducing valve to be normal and increasing the pressure in the slurry discharging pipeline.

The invention discloses an unmanned mining dump truck hydraulic braking system and a control method. The unmanned mining dump truck hydraulic braking system comprises a service brake valve set and a parking brake valve set. The service brake valve group comprises a first hydraulic proportional pressure reducing valve, a second hydraulic proportional pressure reducing valve, a first shuttle valve and a first pressure sensor; the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are connected in parallel; oil outlets of the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are communicated with an oil inlet of a first shuttle valve; an oil outlet of the first shuttle valve is connected with a first pressure sensor; the parking brake valve group comprises an electromagnetic directional valve, a redundant electromagnetic directional valve and a pressure switch; the electromagnetic directional valve is a normally closed valve, and the redundant electromagnetic directional valve is a normally open valve; the electromagnetic directional valve and the redundant electromagnetic directional valve are connected in series, the electromagnetic directional valve is connected with an oil inlet pipeline, the redundant electromagnetic directional valve is connected with an oil outlet pipeline and a parking brake caliper, and a pressure switch is arranged on the oil outlet pipeline.

The invention provides a vehicle air conditioning system and a control method of a two-position three-way reversing valve thereof, and the control method comprises the steps that the output end of a compressor is connected with a first pipeline, the two-position three-way reversing valve is arranged in the first pipeline, and a first opening and a second opening are formed in a valve seat of the two-position three-way reversing valve; the first opening is connected with the input end of the outdoor condenser and forms a first branch; the second opening is connected with the input end of the indoor condenser and forms a second branch; a valve element of the two-position three-way reversing valve is provided with a first flow channel, a second flow channel and a third flow channel which are communicated with one another, the first flow channel is connected with the refrigerant inlet, the second flow channel is connected with the first refrigerant outlet, and the third flow channel is connected with the second refrigerant outlet. The refrigerant inlet is connected with the first pipeline and keeps normally open, the included angle theta between the axis of the second flow channel and the axis of the third flow channel is larger than or equal to 80 degrees and smaller than or equal to 100 degrees, and in the process of switching the refrigerant outlet, refrigerant can always flow in the flow channels of the two-position three-way reversing valve, so that instantaneous pressure building in the reversing process is prevented, and the stability of an air conditioner system is improved.

The invention relates to a hydraulic system for an iron roughneck. The hydraulic system comprises a hydraulic pump station, an electromagnetic directional valve group, a pilot pressure-reducing overflow valve and two upper shackle oil cylinders which are arranged in parallel, an oil supply port and an oil return port of the hydraulic pump station are communicated with corresponding oil ports of the electromagnetic directional valve set in a one-to-one correspondence mode, the electromagnetic directional valve set comprises a first working unit, the first working unit is provided with a first working oil port and a second working oil port, the first working oil port is communicated with rodless cavities of the two upper shackle oil cylinders, and the second working oil port is communicated with rodless cavities of the two lower shackle oil cylinders. Rod cavities of the two upper shackle oil cylinders are communicated with a port B of the pilot pressure reducing overflow valve, a port T of the pilot pressure reducing overflow valve is communicated with an oil tank of the hydraulic pump station, and a port A of the pilot pressure reducing overflow valve is communicated with the second working oil port. According to the iron roughneck hydraulic system, after the screwing pressure reaches the set pressure, low-pressure overflow is carried out through the pilot pressure reduction overflow valve, and therefore it can be guaranteed that a screw thread is screwed, and the screw thread can be prevented from being damaged.

The utility model provides a manual overload protection system which comprises an oil tank, a pilot overflow valve, a first switch valve, a motor and a first control valve group, a hydraulic pump is arranged on the oil tank and connected with a first port of the motor through an oil inlet pipeline, and a second port of the motor is connected with the oil tank through an oil return pipeline. A pilot-operated overflow valve is arranged between the oil inlet pipeline and the oil return pipeline, the oil inlet end of the pilot-operated overflow valve is connected with the oil inlet pipeline, and the oil outlet end of the pilot-operated overflow valve is connected with the oil return pipeline; the first control valve group comprises a first control switch valve, a first control reversing valve and a first control overflow valve; by means of the structure, under the emergency condition, the adjusting pressure of the overflow valve can be adjusted and relieved, and therefore the winch is controlled to quickly loosen the steel wire rope to achieve emergency rope abandoning.