5763 results about "Oil supply" patented technology

The invention discloses a hydrostatic guideway performance testing device and a hydrostatic guideway performance testing method. The hydrostatic guideway performance testing device comprises a base, a pressurizing assembly, a driving assembly, an oil supply assembly, a detection assembly and a processor. A guide rail groove is formed in the guide rail, the pressurizing assembly is arranged on the base and provided with a first position abutting against the static pressure sliding block to apply pressure to the static pressure sliding block and a second position separated from the static pressure sliding block, and the driving assembly is used for driving the static pressure sliding block to slide in the guide rail groove. The oil supply assembly communicates with the static pressure sliding block. The processor is electrically connected with the detection assembly, and the processor is at least used for calculating the rigidity of the oil film, judging the bearing capacity of the static pressure sliding block through the rigidity of the oil film and judging whether the motion performance of the static pressure sliding block meets the standard or not through the flow of oil in the static pressure sliding block. The static pressure guide rail performance testing device solves the problem that a static pressure guide rail performance testing device in the prior art cannot comprehensively test the performance of a static pressure sliding block.

The invention discloses a deep sea underwater electro-hydraulic actuator (EHA) and a control system thereof. The system provides power through the power source module, balance of system oil pressure and pressure of external seawater is controlled through the pressure compensation module, oil circulation and oil pressure control are conducted through the integrated valve set module, a control instruction of the control module is executed through the execution mechanism module, and the control module conducts cooperative control over the whole system. According to the control system, the unbalanced pressure between the system and the deep sea high-water-pressure environment is compensated through the pressure compensator so as to reduce the influence of the deep sea high-water-pressure environment, meanwhile, the pressure compensator serves as an oil tank to supply oil, miniaturization of the system is achieved, and the reliability of the system during underwater work is improved; according to the deep-sea underwater electro-hydraulic actuator, the mounting positions and internal flow channels of all elements of the integrated valve bank are optimized, the pressure loss of fluid in the flow channels is reduced, and the energy utilization efficiency of the deep-sea underwater electro-hydraulic actuator is improved; the asymmetric hydraulic cylinder can operate in four working conditions of deep sea, and underwater high-precision movement can be completed.

The invention discloses a saw chain guide plate lubricating system which comprises an integrally-formed guide plate body and is characterized in that a driven supporting structure is arranged at one end of the guide plate body, a rotating structure is installed on the driven supporting structure, and a transmission wheel is installed on the rotating structure; a saw chain guide groove is formed in the side face of the guide plate body. The guide plate body and the driven supporting structure are provided with an oil conveying channel, one end of the oil conveying channel is connected with an oil supply unit of the lumbering equipment, and the other end of the oil conveying channel makes contact with the rotating structure. Through the arrangement of the oil conveying channel, the service life of the driven end rotating structure is prolonged, the part, making contact with a tree, of the saw chain can be lubricated, and meanwhile the utilization rate of lubricating oil can be increased.

The invention relates to the field of aero-engine bearing cavity structure system testing, and particularly provides an aero-engine bearing cavity inner lubricating oil flow state measuring system which comprises a test piece main body simulating an aero-engine bearing cavity, an oil gas supply and recovery system and a control system. The test piece main body comprises a rotor test piece and a stator test piece which are connected together, and the oil gas supply and recovery system comprises an oil supply system, a gas supply system, an oil return pool and an oil gas separation pump. The control system comprises a controller, and an oil supply throttle valve, an air supply throttle valve, an exhaust throttle valve, a test data acquisition assembly and a test piece main body driving device which are in signal connection with the controller. On the basis of the method, the lubricating oil-air flowing state in the bearing cavity can be monitored and evaluated in real time, and test support can be provided for follow-up bearing cavity optimization design.

A carrier is provided with a first and a second oil passage. The first oil passage is formed so as to communicate a first side surface opening that is open to a first carrier side surface with a first outer peripheral opening that is open to an outer peripheral shaft surface, and the second oil passage is formed so as to communicate a second side surface opening that is open to a second carrier side surface with a second outer peripheral opening that is open to the outer peripheral shaft surface. A first oil receiving portion is formed so as to guide oil supplied from an inner side in a carrier radial direction to the first side surface opening, and a second oil receiving portion is formed so as to guide the oil supplied from the inner side in the carrier radial direction to the second side surface opening.

The invention discloses a hydrostatic guideway performance testing device and a hydrostatic guideway performance testing method, the testing device comprises a base, a limiting part, an oil supply assembly, a pressure reducing valve, a driving part, a detection assembly and a processor, the base is used for installing two guideways, a guideway groove is arranged between the two guideways, and the limiting part is arranged at the tops of the guideways. The oil supply assembly enables oil films to be generated between the static pressure sliding block and the inner wall face of the guide rail groove and between the static pressure sliding block and the limiting part. The pressure reducing valve is used for adjusting the pressure of the oil film between the limiting part and the static pressure sliding block. The driving part is used for driving the static pressure sliding block to slide in the guide rail groove. The processor is at least used for calculating the rigidity of the oil film, judging the bearing capacity of the static pressure sliding block through the rigidity of the oil film and judging whether the motion performance of the static pressure sliding block meets the standard or not through the temperature of oil in the static pressure sliding block and the flow of the oil in the static pressure sliding block. The static pressure guide rail performance testing device solves the problem that a static pressure guide rail performance testing device in the prior art cannot comprehensively test the performance of a static pressure sliding block.

The invention provides an underground coal mine air and water pumping switching electro-hydraulic control system and method, the electro-hydraulic control system comprises an air supply control module, a water supply control module, a negative pressure control module and an oil supply module, and the method adopts a remote control system to control the underground coal mine air and water pumping switching electro-hydraulic control system. According to the underground coal mine air and water pumping switching electro-hydraulic control system, air and water pumping electric control rapid opening and closing and rapid switching of different functions are achieved, the automation degree of air and water pumping switching is improved, and the air and water pumping switching time is shortened; and meanwhile, when dangerous working conditions that gas accumulation exceeds the limit due to hole blocking behind the drill hole or carbon monoxide gas appears in the drill hole and the like, rapid and automatic response processing can be achieved. The air and water pumping conversion efficiency is improved, the labor intensity of workers is relieved, and key technical support is provided for coal mine underground automatic drilling whole-process operation.

The invention discloses an oil supply control system of a hydraulic pump station, and relates to the technical field of hydraulic systems. The oil supply control system of the hydraulic pump station comprises an oil tank; the oil inlet end of the oil supply pump communicates with the oil tank, and the oil outlet end of the oil supply pump is connected to the oil suction end of the variable plunger pump through an oil supply path; a heat exchanger and a filter are sequentially arranged in the oil supply path and used for conducting temperature adjustment and particle filtration on oil. The oil supply path is connected with a bypass pipeline in parallel, the bypass pipeline is communicated with the oil tank through a one-way valve, the opening pressure of the one-way valve is smaller than 2 bar, and the one-way valve is used for guaranteeing the positive pressure of the oil suction end of the variable pump. The oil outlet end of the variable displacement piston pump is connected to an external hydraulic system and is provided with a high-pressure filter; the detection device is arranged in the oil supply path and used for collecting oil temperature and / or pressure signals; and the control module is connected with the detection device and the execution components and is configured to control the start and stop states of the oil supply pump, the variable displacement piston pump and the heat exchanger according to the comparison result of the detection result and a preset threshold value.

The invention relates to the technical field of engines, in particular to a turbocharger and an engine system. The turbocharger comprises a rotating shaft, an integrated bearing and a middle shell, the rotating shaft is sleeved with the integrated bearing, the integrated bearing is sleeved with the middle shell, an oil supply pipeline is arranged in the middle shell and comprises an oil supply inlet, a connecting pipeline, an oil storage chamber, a bearing chamber, an oil outlet pipeline and an oil return cavity which are sequentially communicated, and the integrated bearing is located in the bearing chamber. The oil supply inlet is higher than the bearing chamber, the oil storage chamber is lower than the bearing chamber, and the oil outlet pipeline is higher than the bearing chamber. According to the turbocharger, under the transient working condition, the oil supply amount of the bearing chamber can meet the use requirement; and under the cold start working condition, the oil supply time is short, the rotating shaft is prevented from being abraded, the service life of the rotating shaft is prolonged, and therefore the turbocharger has the long service life.

A transmission device for a motor vehicle includes a gearwheel space, a gearwheel received in the gearwheel space and having at least one oil bunker for supplying oil for lubricating the gearwheel, and at least one oil return device. The oil is conveyable from the oil bunker into the gearwheel space. At least one oil sump for catching the oil is arranged in the gearwheel space. At least one partition is arranged between the oil bunker and the oil sump for separating the oil sump from the oil bunker. The at least one oil return device includes at least one wiper for wiping the oil from the gearwheel and at least one outlet for removing the wiped oil into the oil bunker. The wiper and the outlet are arranged on different sides of the at least one partition and are connected by at least one fluid connection.

An AI-driven wireless lubricator remote control system includes multiple grease injection lubrication devices, a cloud server host and an artificial intelligence (AI) system. Each grease injection lubrication device includes a central control processing unit, a grease injection lubrication unit, a parameter setting unit, an operating status information unit, a detection unit, a warning unit, a wireless communication unit and a remaining oil volume information unit. The grease injection lubrication device can independently monitor the oil supply status and abnormal operating status information of individual lubrication points, and through wireless remote transmission (network or satellite network), the grease injection lubrication device information distributed on the mechanical equipment scattered around the factory is sent to the cloud server host. Furthermore, the mobile device can view the information of each grease injection lubrication device and issue commands directly through APP and the Internet (connected to the cloud server host).

The invention relates to a self-adaptive oil supply assembly, a scroll compressor and an air conditioner. The self-adaptive oil supply assembly comprises a shell, an upper sliding block and a lower sliding block, the shell is provided with an inner cavity, a top opening and a bottom opening, the top opening and the bottom opening communicate with the inner cavity, and the top opening, the inner cavity and the bottom opening jointly form an oil supply channel; a plurality of upper sliding blocks are arranged, each upper sliding block is elastically connected with the inner wall of the inner cavity in the radial direction, and when each upper sliding block is kept in a static state, the upper sliding blocks are spliced to form an upper notch with the diameter equal to that of the top opening; the lower sliding blocks are arranged below the upper sliding blocks, each lower sliding block is elastically connected with the inner wall of the inner cavity in the radial direction, and when the lower sliding blocks are kept in the static state, the lower sliding blocks are spliced together to form a lower notch with the diameter equal to that of the bottom opening.

The invention relates to the technical field of engineering machinery, and particularly discloses an electrically-driven metering pump load-sensitive system, a control method and engineering machinery, the electrically-driven metering pump load-sensitive system comprises a control unit, a driving motor assembly, a metering pump, a pilot hydraulic control unit, a pilot handle assembly, a load-sensitive valve assembly, an actuator assembly, a sensor assembly and a pressure difference control module; the driving motor drives the metering pump to supply oil to the load-sensitive valve assembly so as to drive the actuator assembly to operate; the control unit receives the maximum outlet pressure and the maximum load pressure of the pump collected by the pressure sensor, receives a system target pressure difference signal of the pressure difference control module at the same time, and synchronously controls the rotating speed of the motor and the valve target pressure difference output by the proportional pressure reducing valve. The system aims to solve the problems that a traditional upstream compensation load sensitive system lacks a flow saturation resisting function, and a downstream compensation load sensitive system has extra reversing energy consumption and fixed system pressure difference setting.

The invention provides a conduction oil boiler system optimization control method and system based on an adaptive algorithm. The method comprises the steps of data acquisition, data preprocessing, model training, parameter optimization and real-time control. The system comprises a sensor network, a data processing module, a model training module, an optimization calculation module and a control execution module. Boiler operation data are collected in real time through a sensor network, a combustion boiler natural gas dynamic prediction model and a circulating pump efficiency optimization model are constructed after preprocessing, parameters such as the number of boilers, the circulating pump frequency and the oil supply temperature are optimized through an adaptive differential evolution (ADE) algorithm, and finally closed-loop adjustment is achieved through a control execution module. According to the method, the data-driven modeling technology and the self-adaptive optimization capability are utilized, so that system parameters can quickly respond to process demand changes, the heat efficiency is remarkably improved, the energy consumption is reduced, the temperature fluctuation is reduced, the operation and maintenance cost is optimized, and the operation performance and the economical efficiency of the heat conduction oil boiler system are comprehensively improved.

A first oil receiving portion disposed on a downward side of a rotary electric machine, an oil supply passage configured to supply oil accumulated in the first oil receiving portion from a flow port to a lubrication target part, and a discharge port configured to discharge the oil in the first oil receiving portion are provided. The discharge port is provided on an upper side relative to a reference oil level, which is set on a lower side relative to a rotor and on an upper side relative to the flow port, and the discharge port is provided to include a portion positioned on a lower side relative to a limitation-target oil level, which is formed by a tilt due to an attitude change and acceleration or deceleration of a vehicle.

The invention provides a high-precision numerical control machine tool operation state abnormity monitoring method and system, and relates to the technical field of numerical control machine tool operation state abnormity monitoring. The method comprises the steps that the displacement deviation of a feeding system, the oil supply pressure of a lubricating system, real-time temperature data of a driving motor stator and original signals during machining are collected; the three are preprocessed to obtain a final time sequence data set, and an original signal is processed to obtain a normalized smooth physical signal; then obtaining associated features by using a multi-parameter association analysis algorithm, and comparing the associated features with a preset dynamic reference feature library to judge the running state; if the operation state of the high-precision numerical control machine tool is abnormal, the fault tree diagnosis model is used for positioning an abnormal root part and process parameters, then a targeted solution is generated, full-process monitoring of the operation state of the high-precision numerical control machine tool can be completed, and data collection, preprocessing, correlation analysis, abnormality judgment, and root positioning and targeted solution generation during abnormality are achieved.

The invention relates to the technical field of oil supply assemblies in afterburner components of aero-engines, in particular to a multi-channel distributed series finger-shaped oil supply header pipe and an afterburner. The multi-channel distributed series finger-shaped oil supply header pipe comprises a body, and a plurality of fuel oil channels are formed in the body; the upper end of the fuel oil channel penetrates through the top surface of the body; each fuel oil channel is correspondingly provided with a plurality of main fuel oil injection holes, the main fuel oil injection holes are communicated with the fuel oil channels, and the axes of the main fuel oil injection holes are perpendicular to the central axis of the body; the plurality of main fuel injection holes in each fuel channel are arranged at intervals from top to bottom; a plurality of bypass oil injection holes are formed in the position close to the main oil injection hole, and the bypass oil injection holes are communicated with the main oil injection hole through connecting holes; the main oil injection hole, the bypass oil injection hole and the connecting hole are all formed in the body.

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 invention relates to the technical field of mineral product drilling, and discloses a mineral product resource exploration drilling device.The mineral product resource exploration drilling device.The mineral product resource exploration drilling device.The mineral product resource exploration drilling device.The mineral product resource exploration drilling device.The mineral product resource exploration drilling device.The drilling device.The drilling device.The drilling device.The drilling device.The drilling device.The drilling device.The drilling device.The drilling device.The drilling device.The drilling device. The other end of the folding assembly is connected with an oil supply assembly and a moving mechanism, the other end of the moving mechanism is connected with a supporting assembly and two telescopic assemblies, the other two ends of the supporting assembly are connected with an extrusion assembly and a clamping assembly respectively, the other end of the extrusion assembly is connected with the oil supply assembly, and the other end of the oil supply assembly is connected with a pushing assembly. The other two ends of the pushing assembly are connected with the two telescopic assemblies correspondingly. According to the mineral resource exploration drilling device, through the synergistic effect of the moving mechanism, the pushing assembly and the hydraulic system, automatic moving, erecting and accurate alignment of a new drill rod are achieved, manual intervention or external hoisting equipment is not needed, and the drill rod assembling process is remarkably simplified.

The invention provides a variable pitch system and a wind generating set, and the variable pitch system comprises a variable pitch oil cylinder which is provided with a rod cavity, a rodless cavity and a piston rod; the variable-pitch control unit is arranged between an oil source and the variable-pitch oil cylinder, and the variable-pitch control unit is communicated with the rod cavity and the rodless cavity, so that a piston rod of the variable-pitch oil cylinder extends out or retracts back to carry out variable-pitch adjustment on blades by switching the flow directions of an oil inlet path and an oil outlet path of the rod cavity and the flow direction of an oil outlet path of the rodless cavity; the anti-vortex unit is connected between one of the rod cavity and the rodless cavity and an oil source, the anti-vortex unit can supply oil to one of the rod cavity and the rodless cavity and can close an oil supply and return path of the other one of the rod cavity and the rodless cavity, so that the piston rod is kept still, and the blades are kept at the anti-vortex angle.

A bearing arrangement includes a first anti-friction bearing including an inner ring and an outer ring, a second anti-friction bearing including an inner ring and an outer ring, a first spacer element seated between the inner ring of the first anti-friction bearing and the inner ring of the second anti-friction bearing and including an oil supply channel which runs in a radial direction, and a second spacer element arranged between outer ring of the first anti-friction bearing and the outer ring of the second anti-friction bearing for adjusting a bearing prestress. The second spacer element includes at least two curved pieces which are placed circumferentially in opposition to one another. The second spacer element extends in the radial direction such as to from a radial gap to the first spacer element and includes an oil supply channel which runs in the radial direction.

The invention discloses an axial ring lower lubricating structure and an aero-engine with the axial ring lower lubricating structure. The axial ring lower lubricating structure comprises a switching oil distribution device, a connecting bearing arranged on the outer circle of the switching oil distribution device and a plurality of oil supply nozzles. The first end of the switching oil distribution device is provided with an oil distribution cavity, the spline section behind the first end of the switching oil distribution device is provided with an inner spline, and an inclined oil conveying channel set and an axial oil conveying channel set are further arranged in the spline section. The oil supply nozzles are used for spraying lubricating oil into the oil distribution cavities, and the oil distribution cavities are used for distributing the lubricating oil so that the lubricating oil can correspondingly enter the oblique oil conveying channel set and the axial oil conveying channel set under the rotating centrifugal effect, and the lubricating oil in the oblique oil conveying channel set can continue to enter the connecting bearing for lubrication under the rotating centrifugal effect. And lubricating oil in the axial oil conveying channel group continues to enter the inner spline for lubrication under the rotating centrifugal effect. According to the structure, the whole lubricating oil system is compact in flow path structure, high in reliability, high in lubricating efficiency and high in function integration degree, and the lubricating and cooling problems of high-DN-value bearings and splines of aero-engines are effectively solved.

A power transmission device for a vehicle includes a housing that accommodates a power transmission mechanism, a control valve configured to control an oil pressure supplied to the power transmission mechanism, a first pump and a second pump configured to supply oil to the control valve. The housing includes a first chamber that accommodates the power transmission mechanism and the first pump, and a second chamber that is arranged adjacent to the first chamber in a horizontal line direction. In the first chamber, the first pump is arranged such that an axis of rotation of the first pump extends along a direction of an axis of rotation of the power transmission mechanism. In the second chamber, the control valve is arranged upright. In the second chamber, the second pump is arranged upright with an axis of rotation of the second pump extending along a vertical direction.

The invention provides a self-lubricating crankshaft and refrigeration equipment, and relates to the field of refrigeration equipment, an annular concave main shaft oil storage groove is formed by main shaft part sections where oil storage section oil grooves are distributed, the oil storage space is increased, and the lead of the oil storage section oil grooves is smaller than that of other sections of spiral oil grooves, so that the speed of refrigerating machine oil is slower during backflow; the eccentric oil storage groove formed in the end face of the connecting rod shaft is communicated with the eccentric section oil groove through the oil outlet hole, the function of storing the refrigerating machine oil is achieved, and when restarting is conducted after shutdown, the stored refrigerating machine oil can be put into use rapidly and can be supplied to the eccentric part and the main shaft part in time to provide initial lubrication. Dry friction at the starting moment is reduced, the reliability of the crankshaft during starting is improved, and poor lubrication caused by insufficient oil supply is avoided.

The invention discloses a five-axis milling machine, and relates to the technical field of five-axis milling machines, a moving frame is arranged on the side of a working table, a working module used for clamping a workpiece is arranged on the moving frame, and a rotating box connected with an external liquid supply assembly is rotationally arranged below the working module; and a nozzle for atomizing the cutting liquid is arranged below the rotating box in a penetrating mode, a lubricating box is arranged on the side of the rotating box, and an oil supply mechanism is arranged between the lower portion of the lubricating box and the lower surface of the working module. According to the five-axis milling machine, the moving frame can achieve three-axis movement through mutual cooperation of the X-axis moving module, the Y-axis moving module and the Z-axis moving module, so that workpieces at different position distances are machined according to needs, the A-axis rotating module can drive the containing table to conduct A-axis rotation, the C-axis rotating module can drive the machining table to conduct C-axis rotation, and therefore the machining efficiency is improved. And the five shaft bodies are matched with one another to mill a workpiece, so that the machining efficiency is improved.

A light-weight gas compressor convenient to move relates to the field of gas compressors, and is characterized in that three forward cylinders and three reverse cylinders which are arranged in a staggered manner are uniformly fixed on the outer edge surface of an annular plate; the forward air cylinder B is connected with the reverse air cylinder A, the reverse air cylinder A is connected with the forward air cylinder A, the forward air cylinder A is connected with the reverse air cylinder B, the reverse air cylinder B is connected with the forward air cylinder C, the forward air cylinder C is connected with the reverse air cylinder C, and the reverse air cylinder C is connected with an exhaust pipe; the power of the double-end piston rod hydraulic oil cylinder is provided by an oil supply hydraulic oil cylinder A and an oil supply hydraulic oil cylinder B; the double-end piston rod hydraulic oil cylinder arranged in the annular plate is used for controlling the three reverse air cylinders and the three forward air cylinders to achieve gas compression, and the purpose of gas compression which is light in weight and convenient to move is achieved.

The utility model provides an unloading hydraulic system which comprises a hydraulic pump station and a winch control system, the hydraulic pump station supplies oil to the winch control system, the winch control system drives a motor to rotate, and the winch control system comprises a first middle-position unloading valve and a first operating valve. An oil outlet of the hydraulic pump station is connected with the P end of the first operating valve through a first oil outlet pipeline, the T end of the first operating valve is connected with an oil return opening of the hydraulic pump station through a first oil return pipeline, the A end of the first operating valve is connected with a first port of the motor, and the B end of the first operating valve is connected with a second port of the motor. A first middle-position unloading valve is arranged between the first oil inlet pipeline and the first oil return pipeline; by means of the structure, when the winch is standby, oil supplied by the hydraulic pump station can be unloaded and flow back to the oil tank, and therefore it is guaranteed that an oil way of the hydraulic system can circulate at low pressure, and energy consumption of the hydraulic system is small.

The invention relates to the technical field of hydraulic lock testing, and discloses a hydraulic lock service life reliability testing device which comprises a testing table. The number of the load oil cylinders is two, the two load oil cylinders are arranged at the top end of the test board, and one load oil cylinder can slide relative to the test board; the two load oil cylinders are communicated with two oil ports in the top end of the hydraulic lock body respectively, and an oil outlet of one load oil cylinder is communicated with an oil inlet of the other load oil cylinder through a connecting pipe. The number of the hydraulic pumps is two, the two hydraulic pumps are arranged at the bottom end of the test board and communicate with the hydraulic lock body through reversing valves, and the other ends of the reversing valves are provided with external oil tanks through oil return pipes so that oil supply and oil return of two oil ways of the hydraulic lock body can be achieved. The hydraulic lock service life reliability testing device can effectively solve the problems that in the prior art, in the testing process, an oil pipe of a load oil cylinder is difficult to adapt to hydraulic locks with different hole pitches, and the testing work is not safe and reliable enough.

The invention relates to a plunger pump system, a control method and a filter press. The plunger pump system comprises an oil storage container, an oil pump device, a plunger device and a hydraulic device. The hydraulic device comprises two hydraulic assemblies, each hydraulic assembly comprises an oil cylinder and a piston, the piston divides the oil cylinder into a rod cavity and a rodless cavity, and the rod cavities of the two hydraulic assemblies or the rodless cavities of the two hydraulic assemblies are communicated with each other. The oil pump device and the hydraulic device are connected through an oil supply pipeline, a liquid flow reversing device and a one-way valve are connected to the oil supply pipeline, the flow direction of hydraulic oil in two branch pipelines of the oil supply pipeline is controlled by the liquid flow reversing device to be periodically switched, and the flow directions of the hydraulic oil in the branch pipelines are opposite at the same moment. One end of the electric control overflow device is connected between an oil pump device and a one-way valve, the other end of the electric control overflow device is connected with an oil storage container, and the electric control overflow device is controlled to conduct an oil outlet of the oil pump device and the oil storage container during reversing of the liquid flow reversing device and discharge impact of hydraulic oil reversing on the plunger pump system.