101 results about "Electrohydraulic servo valve" patented technology

The invention discloses an electrical control device for high-pressure protection in a hydraulic control system, which relates to the technical field of hydraulic control and comprises a high-pressure detection module for monitoring pressure data of the hydraulic system in real time and transmitting the pressure data to a control processing core through an analog quantity input module. Two-channel independent control logic is adopted through the redundancy protection unit, even if a single loop breaks down, the other loop can still independently execute a safety instruction, the risk of single-point failure is eradicated, meanwhile, the intelligent control unit achieves advanced and accurate pressure adjustment and trend suppression through a high-frequency-response electro-hydraulic servo valve and a proportional valve and depending on bus communication, and the safety performance of the system is improved. The high-voltage risk is eliminated in the bud, the leap from passive response to active protection is achieved, high system integration and intelligent management are achieved through the intelligent valve terminal, remote monitoring and diagnosis are supported while wiring is simplified, and maintainability is enhanced.

The invention relates to the technical field of servo valve testing, and particularly discloses an electro-hydraulic servo valve test bench and a test method thereof, and the test bench comprises a calibration basis obtaining module which constructs each correction basis; the static performance test module performs static performance synchronous test and signal compensation on the tested electro-hydraulic servo valve based on the channel delay compensation table to obtain a static performance index; the dynamic performance test module performs dynamic frequency sweeping test and distortion correction on the tested electro-hydraulic servo valve based on the channel delay compensation table and the frequency-amplitude compensation coefficient mapping table to obtain a dynamic performance index; the internal leakage performance test module is used for performing internal leakage test and leakage amount compensation on the tested electro-hydraulic servo valve based on a temperature-viscosity-internal leakage amount three-dimensional correction model of the hydraulic oil source to obtain an internal leakage performance index; the test result summarization module obtains a test result based on the indexes; the integrated precise test of the static and dynamic performance and the internal leakage performance of the servo valve is realized.

The invention provides an integrated device and method for adjusting the air flow and heat of an aero-engine, and relates to the field of aero-engines. In the device, an air path shell is connected with an oil path shell, the first connecting end of a piston rod is connected with a main valve element through a connecting base, and the second connecting end of the piston rod is connected with the first connecting end of a piston; a third connecting end of the piston rod is connected with the linear displacement sensor; a second connecting end of the piston is in contact with the interior of the left valve sleeve; an oil inlet of the oil way shell is connected with an input oil port of the electro-hydraulic servo valve, an oil return port of the oil way shell is connected with an oil return port of the electro-hydraulic servo valve, the first working oil port is connected with the left valve sleeve, and the second working oil port is connected with the right valve sleeve. The adjusting method comprises the steps of air heat adjusting and air heat flow simultaneous adjusting. The flow and heat of air entering the air compressor can be distributed to prevent an aero-engine from freezing and surging, meanwhile, high-temperature gas is prevented from directly heating an oil way, and the requirements for light weight and integration of the aero-engine are met.

The invention discloses a device and method for measuring the median force of a torque motor, and belongs to the technical field of electro-hydraulic servo valve detection equipment.The device comprises a support, a testing tool, a lifting sliding table, a translation mechanism, a force sensor and a small ball clamp, the lifting sliding table is arranged at the lower end of the support, and the translation mechanism is arranged at the upper end of the support; the small ball clamp comprises a clamp pipe with a vertical through opening in the middle, a ball holding type clamp head part located in the clamp pipe and a double-end screw installed at one end of the clamp pipe and used for being connected with a force sensor, and through the mode, the torque motor neutral-position force measuring device is compact in structure, convenient to adjust and high in measuring precision; precise adjustment of the position of the small ball is achieved through the lifting and fine adjustment structure, and stable and reliable meso-position force measurement is achieved through the high-precision sensor and the light fixture structure.

The utility model belongs to the technical field of actuator installation, in particular to an installation frame of a servo actuator, which comprises a servo actuator main body and an installation frame body, the top of the installation frame body is provided with an installation groove, and the servo actuator main body comprises an electro-hydraulic servo valve and an actuating cylinder positioned on the inner side of the electro-hydraulic servo valve. According to the mounting frame of the servo actuator, an electro-hydraulic servo valve on a servo actuator body is clamped to the inner side of a mounting groove, the front portion, the rear portion and the bottom of the electro-hydraulic servo valve are limited, a fixing screw rod is sleeved with a fastening plate so that the fastening plate can be clamped in a clamping groove, then the fixing screw rod is sleeved with a fastening lantern ring in a threaded mode, and therefore the electro-hydraulic servo valve can be fixed. The fastening sleeve ring is rotated to drive the fastening plate to move downwards, so that the fastening plate is tightly clamped with the clamping groove, the top, the left side and the right side of the electro-hydraulic servo valve can be limited, the servo actuator body can be limited and fixed in multiple directions after being installed, and the stability of the electro-hydraulic servo valve in the operation process is further improved.

The application discloses an oil leakage prevention device for an electro-hydraulic servo valve, which comprises an electro-hydraulic servo valve body, a connecting pipe, a sealing pipe, an oil leakage prevention mechanism, a hinged seat, a pressing rod, a clamping block, a locking mechanism, a mounting ring, a supporting ring, a screen and a jacking rod, the connecting pipe is arranged on the electro-hydraulic servo valve body, the sealing pipe is slidably sleeved on the outside of the connecting pipe, an inner bushing is fixedly connected to the inside of the sealing pipe, the oil leakage prevention mechanism is arranged on the inside of the sealing pipe, the mounting ring is fixedly connected to the outside of the connecting pipe, the hinged seat is arranged on the outside of the sealing pipe, the pressing rod is hingedly connected to the hinged seat, the clamping block is fixedly connected to the pressing rod, and the clamping block is clamped with the mounting ring. The application relates to the oil leakage prevention device for the electro-hydraulic servo valve, and has the characteristics of simple mounting structure and automatic plugging during dismounting.

The invention belongs to the technical field of electro-hydraulic servo valves, and relates to a prestage-based electro-hydraulic servo valve driving force increasing method, which comprises the following steps of: configuring a benchmarking electro-hydraulic servo valve and a to-be-calibrated electro-hydraulic servo valve; respectively obtaining a benchmarking pressure-current characteristic curve of the benchmarking electro-hydraulic servo valve, a benchmarking pressure-displacement characteristic curve of the prestage, a pressure-current characteristic curve of the electro-hydraulic servo valve to be calibrated and a pressure-displacement characteristic curve of the prestage; under the constant value input current, the benchmarking displacement of the benchmarking electro-hydraulic servo valve deflection plate and the actual displacement of the electro-hydraulic servo valve deflection plate to be calibrated are obtained; the theoretical displacement of a deflection plate of the electro-hydraulic servo valve to be calibrated is calculated, the pressure-displacement characteristic curve is corrected, and the benchmarking displacement of the benchmarking electro-hydraulic servo valve under the constant input current is found out; and lifting the theoretical displacement to the benchmarking displacement based on a preset lifting scheme. The preset lifting scheme comprises the steps of improving the rigidity of the bourdon tube and the feedback rod, increasing the width of the jet orifice of the nozzle and reducing the width between the two receiving ports.

The application belongs to the technical field of aero-engines, and particularly relates to a method for controlling water flow of a multi-pipeline ejection pre-cooling system of an aero-engine. The water flow of the multi-pipeline is allocated by a digital electronic controller, and each pipeline is independently controlled. The given value of the water supply is calculated by means of temperature deviation, closed-loop control is realized, and the fitting degree of the water injection amount and the required cooling amount is improved. Through the feedback of the inlet temperature, the dependence on the control accuracy of the water metering valve can be reduced. Even if the metered water is inaccurate, it can be compensated through temperature closed-loop adjustment, the industrial requirements of the valve and the electro-hydraulic servo valve are reduced, and the production cost is reduced.

The application relates to a full closed-loop wall thickness control and profile following error detection control method and system, wherein the method comprises the following steps: obtaining user profile requirements and setting a parison wall thickness axial variation curve, outputting a driving signal to an electro-hydraulic servo valve according to the parison wall thickness axial curve; controlling the electro-hydraulic servo valve according to the driving signal, so that the servo oil cylinder is driven to move the center rod of a blow molding machine up and down, and the blow molding machine head die gap is changed; receiving a feedback signal of an electronic ruler connected to the servo oil cylinder, comparing the feedback signal with a preset standard signal, judging the operation condition and obtaining a comparison result; receiving monitoring signals of each part of the blow molding process, comparing the actual operation information with a preset monitoring range, obtaining a comparison result; generating an adjustment signal according to the comparison result and the comparison result, adjusting each part of the blow molding process and the head die position, so that the dynamic closed-loop adjustment of the parison wall thickness is completed. The application has the effect that the parison wall thickness can be dynamically closed-loop controlled.

The utility model discloses a vibration signal testing tool for an electro-hydraulic servo valve, and relates to the technical field related to valves. The device comprises a base and two clamping plates, the two symmetrically-distributed clamping plates are fixed to the upper end face of the base, a first vibration sensor is fixed to the corner of the upper end face of the base, a second vibration sensor is fixed to one end face of the base, and a third vibration sensor is fixed to one side face of the base. First screws are connected into the two ends of each clamping plate in a penetrating and threaded mode, and the tail ends of the first screws face the longitudinal center line of the base and are rotationally connected with clamping blocks. Through the arrangement of the base, the clamping plate, the clamping block, the second screw, the first screw, the fixing screw, the through hole, the first vibration sensor, the second vibration sensor and the third vibration sensor, the problem that a tool is single in clamping mode; in the prior art, the test tool can not satisfy the vibration signal test of the electro-hydraulic servo valve in different states, and the vibration signal test effect of a single position is not good.

This invention belongs to the field of precision machining technology, and discloses a structured contact wheel belt grinding device and control method with flow pressure regulation. It has the function of grinding structured surfaces of various sizes with the same structure, including a support structure and a structured surface grinding actuator. The support structure includes a base plate, ribs, a motor fixing component, and an electric actuator support. The structured surface grinding actuator includes a drive motor, a motor connecting shaft, a drive wheel, a sanding belt, a tension wheel, a tension wheel bracket, a tension wheel bracket fixing component, a guide wheel assembly, a guide wheel assembly bracket, an electric actuator, a force sensor mounting flange, a force sensor, a contact wheel frame fixing component, a contact wheel frame, a structured contact wheel, a ring clamp, hydraulic oil lines, and an electro-hydraulic servo valve. This invention is mainly used for structured surface belt grinding. It adjusts the hydraulic system loading parameters according to the real-time changes in grinding force during the grinding process to control the internal flow pressure of the structured contact wheel, thereby meeting the stable processing requirements of structured surfaces of different sizes.

The application discloses a mine intrinsic safety type electro-hydraulic servo valve and relates to the technical field of coal mine hydraulic control. The servo valve comprises a servo valve, an electromagnetic pilot valve, a hydraulic control main valve assembly, the hydraulic control main valve assembly comprises a plurality of hydraulic control main valve spools, the hydraulic control main valve assembly is connected with the upper chamber of a jack through a pipeline, and the jack is pushed out or retracted through liquid supply or liquid return; a two-stage hydraulic control check valve assembly is used for controlling the liquid state change in the lower chamber of the jack, and the motion state change of the jack is realized; and a servo valve assembly is used for controlling the medium flow in the lower chamber, and the working state of the jack is controllable. The application skillfully combines the 'high-precision continuous regulation' of servo proportional control and the 'large-flow quick response' of traditional hydraulic control switching, fully overcomes the industry pain points such as fixed valve core flow, rough action, low liquid return efficiency and expansion difficulty on the basis of retaining the high reliability of the coal mine electro-hydraulic control system.

1. Name of the product in this design: Electro-hydraulic servo valve (SL661). 2. Application of this design: This design is used in metallurgical forging, mechanical engineering, aerospace, shipbuilding and other hydraulic systems. 3. The key design features of this product are the combination of shape and pattern. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention belongs to the technical field of fuel regulator testing, and provides a fuel regulator metering module fast debugging device and method.The device comprises an upper computer and a data input and output module, and a control signal is output into the data input and output module; the data input and output module sends the control signal to the electro-hydraulic servo valve driving module; the linear displacement sensor driving module collects feedback signals of a linear displacement sensor of the fuel regulator metering module and outputs corresponding difference ratio sum signals to the data input and output module after calculation, and the data input and output module sends the difference ratio sum signals and collected electro-hydraulic servo valve control signals back to the upper computer. And the upper computer performs closed-loop control according to the control signal and the feedback signal. The fuel regulator metering module control instruction can be given, the feedback instruction of the fuel regulator metering module is collected, closed-loop control of the fuel regulator metering module is completed, and the purpose of rapid debugging is achieved.

The utility model provides a ship lock gate synchronous jacking device which comprises a U-shaped base arranged in a river channel, a gate arranged in the base, a connecting plate fixed above the gate and extending out of the two sides of the base, hydraulic cylinders arranged below the two sides of the connecting plate and distance measuring sensors arranged on the connecting plate above the hydraulic cylinders. An electro-hydraulic servo valve is further arranged in a jacking hydraulic loop of the hydraulic cylinder, a distance measuring sensor is arranged above the hydraulic cylinder, the electro-hydraulic servo valve is arranged in an extending oil way of the hydraulic cylinder, and the flow of the electro-hydraulic servo valve is fed back and adjusted by comparing the change value of the distance measuring sensor on the hydraulic cylinder. Therefore, the purpose of synchronous movement of the hydraulic cylinders is achieved.

This invention provides an adaptive pressure control method and control system for a machine tool hydraulic clamping system, relating to the field of machine tool hydraulic control technology. The method includes: real-time acquisition of the pressure in both chambers of the clamping cylinder, piston rod displacement, and oil temperature; dynamic determination of the target clamping pressure based on the workpiece material and machining conditions; construction of an RBF neural network for online estimation of unmodeled dynamics; solving an improved robust control law using the estimated values ​​to obtain the control quantity; and outputting the control signal to an electro-hydraulic servo valve to achieve real-time adaptive control. This invention, through a composite algorithm of RBF neural network and improved robust control, effectively compensates for the nonlinearity and parameter uncertainties of the hydraulic system, achieving stable and reliable control of the clamping pressure and preventing workpiece deformation or loosening.

The invention belongs to the field of mechanical hydraulic pressure, and particularly relates to a wide-temperature-range stable electro-hydraulic servo valve and a method, and the electro-hydraulic servo valve comprises a torque motor part arranged on a shell, and a hydraulic amplification stage part, a power stage slide valve part, a fixed-difference pressure reduction part and a viscosity maintaining part which are arranged in the shell; according to the invention, the function of stabilizing the difference value between the oil inlet pressure and the oil return pressure is realized; according to the viscosity keeping mechanism, the change value of the viscosity of the hydraulic oil along with the temperature is creatively realized, the viscosity compensation can be carried out by applying changed pressure to the oil liquid, and finally, the viscosity of the oil liquid is not changed.

The invention discloses a press fitting tool for an electro-hydraulic servo valve armature assembly, and belongs to the technical field of assembly tools, the press fitting tool comprises a left mold, a right mold, an armature positioning assembly, a locking assembly and a positioning clamp, the left mold and the right mold are spliced through the locking assembly, and two positioning grooves are spliced to form a positioning cavity after splicing; the two upper guide grooves are spliced to form an upper guide hole, the two lower guide grooves are spliced to form a lower guide hole, the positioning clamp is inserted into the limiting insertion hole, the positioning groove is located in the positioning cavity, a baffle on a feedback rod mechanism in the armature assembly is located in the positioning groove, and a spring tube in the armature assembly is located in the upper guide hole and the positioning cavity. And an armature in the armature assembly is limited by the armature positioning assembly and is located above the spring tube, through the reasonable structural design, accurate positioning and guiding of parts in the assembling process are achieved, the assembly assembling precision is improved, and the product consistency and the production efficiency are improved.

The invention belongs to the technical field of machinery, and discloses an electric servo pneumatic switching valve integrated with a torque motor, which comprises a motor assembly and a servo valve assembly, the servo valve assembly comprises a valve sleeve and a valve core, the valve core can axially move in the valve sleeve, and the valve sleeve is provided with an oil supply port, a load port 1, a load port 2 and an oil return port. When the valve core axially moves from a neutral zero position in the valve sleeve, the flow area between the oil supply port and one of the load port 1 or the load port 2 is gradually increased from zero, and meanwhile, the other one of the load port 1 or the load port 2 is communicated with the oil return port; an output shaft of the motor assembly is connected with the valve element through an eccentric structure, and axial movement of the valve element in the valve sleeve is controlled. A traditional spring tube, a traditional feedback rod and a welding point between the spring tube and the feedback rod are omitted, the valve element is directly driven by the motor, two use environments of a complex pilot-level and mechanical feedback mechanism, an electric servo pneumatic servo valve and an electro-hydraulic servo valve are omitted, the limit can resist the vibration quantity value of 200G, and the servo valve can be suitable for being used in the extreme environment.

This invention provides a two-dimensional electro-hydraulic servo valve with an external zeroing mechanism, comprising a spool valve assembly, a two-dimensional motor, and a displacement sensor, all coaxially arranged. The spool valve assembly includes a valve body, a valve core mounted within the valve body, and a valve sleeve disposed outside the valve core. The motor shaft of the two-dimensional motor is fixedly connected to the valve core. The key feature is that a valve core zeroing mechanism is provided on the outside of the electro-hydraulic servo valve. This mechanism includes an elastic feedback rod connected to the valve core. The first end of the elastic feedback rod is fixedly connected to a flexible component, which has a rotation center point. The elastic feedback rod and the flexible component rotate around this rotation center point. The second end of the elastic feedback rod is directly connected to the valve core. This invention enables rotary zeroing and axial zeroing reset of the two-dimensional electro-hydraulic servo valve core, with minimal wear between components and easy disassembly and replacement.

The invention relates to the technical field of hydraulic systems, and discloses an electro-hydraulic servo valve fault diagnosis simulation system which comprises a control cabinet, a fault diagnosis unit, a hydraulic station, a servo valve, a hydraulic cylinder and a load and further comprises a fault simulation valve composed of a valve body and a hydraulic signal acquisition unit. A first channel oil way and a second channel oil way are arranged on the valve body, the first channel oil way and the second channel oil way are used for being connected between a servo valve and a hydraulic actuator in series, the first channel oil way and the second channel oil way are transversely formed in the valve body in a penetrating mode, and high-pressure oil pipe joints are installed at channel openings in the front end and the rear end of the valve body correspondingly. And two cylindrical grooves are downwards formed in the upper end of the valve body. The fault diagnosis simulation system of the electro-hydraulic servo valve can safely, controllably, repeatedly and accurately simulate a physical device with various faults in a laboratory environment so as to solve the problem that a high-quality fault data source is difficult to collect.

The invention relates to the technical field of automatic navigation of agricultural machinery, and discloses a furrow profiling self-adaptive crawler chassis multi-mode fusion control system and a correction method. The method comprises the following steps: acquiring furrow three-dimensional point cloud data through a stereoscopic vision sensor array, and detecting a soil compactness profile by using a soil probe. And segmenting the point cloud data to extract a furrow ridge line contour and a furrow bottom boundary line, and constructing an environment digital twinborn body with a mechanical property in combination with a soil supporting force coefficient. A chassis attitude is obtained through an inertial measurement unit and is registered with a digital twinborn body to obtain a pose offset matrix, and a transverse deviation correction amount and a longitudinal pitching compensation amount are calculated according to the pose offset matrix. Meanwhile, contact pressure distribution of the crawler belt and soil is predicted, a crawler belt tensioning mechanism adjusting instruction is generated, control is executed through an electro-hydraulic servo valve set, and a closed loop is formed by verifying the effect through a track scanner. According to the invention, active predictive control based on environmental physical characteristics is realized, and the navigation precision and the driving stability of the chassis in a ridge culture environment are improved.

The application discloses a piezoelectric double-nozzle baffle electro-hydraulic servo valve, which comprises a valve seat, control oil path interfaces, oil return ports, high-power oil path interfaces, first hydraulic cylinder interfaces and second hydraulic cylinder interfaces are formed above the valve seat; a valve sleeve mounting seat is installed at the center position of the valve seat, side end covers are arranged on the two sides of the valve sleeve mounting seat; a baffle fixing seat is installed above the valve sleeve mounting seat, a piezoelectric baffle assembly is installed at the center of the baffle fixing seat; the piezoelectric baffle assembly comprises a baffle, a piezoelectric sheet and a strain sheet; a valve sleeve is installed inside the valve sleeve mounting seat, and a spool valve is arranged inside the valve sleeve. The piezoelectric double-nozzle baffle electro-hydraulic servo valve has the characteristics of high frequency response, no electromagnetic interference and the like, can realize the characteristics of high frequency response, large flow and low power consumption of the electro-hydraulic servo valve, can meet the use requirements of special application scenarios and has high application value.

The invention discloses a structure for increasing shearing force of a valve element of a servo valve, an electro-hydraulic servo valve and a control method, and belongs to the technical field of hydraulic elements. The valve sleeve is provided with a prestage oil supply and passing ring groove, the two sides of the middle of the valve element are provided with ring grooves and small end face communication holes, and the reset spring is arranged on the valve element. The electro-hydraulic servo valve is of a two-stage structure, and the structure is arranged between the prestage and the main slide valve; according to the control method, an acting current point is defined by constructing a current-pressure difference coordinate system, the pressure difference is not changed when the current is small, and the pressure difference is communicated between the control cavity and the oil inlet window when the current is large. Original valve parameters are not changed, normal control is not affected, the shearing force and the anti-pollution capacity of the main sliding valve are improved, reliability is high, and the method is suitable for a nozzle baffle or a jet type electro-hydraulic servo valve.

The utility model relates to a positioning tool for detecting the cylindricity of an inner hole of a valve body of an electro-hydraulic servo valve, which is assembled on roundness measuring instrument detection equipment and comprises an installation column body, a clamping device, a positioning device and a positioning device, the installation column body is provided with a circular positioning and clamping surface and is matched with the clamping device on the roundness measuring instrument detection equipment, and the clamping device clamps the circular positioning and clamping surface; the valve body positioning seat is connected with the mounting column body and used for placing an electro-hydraulic servo valve body, and the electro-hydraulic servo valve body abuts against the valve body positioning seat, so that an inner hole in the electro-hydraulic servo valve body and the mounting column body are coaxially arranged; and the fixing device is used for fixing the electro-hydraulic servo valve body on the valve body positioning seat. The utility model provides a positioning tool for detecting the cylindricity of an inner hole of a valve body of an electro-hydraulic servo valve, which improves the measurement efficiency and ensures the consistency of measurement.

The invention relates to the technical field of cooling and straightening for metal heat treatment, and discloses a cooling and straightening device for metal heat treatment and a using method thereof.The cooling and straightening device for metal heat treatment comprises a straightening box outer layer, a straightening mounting base is installed at the top of the straightening box outer layer in a penetrating mode, and a straightening heat dissipation net plate is installed at the top of the straightening mounting base in a penetrating mode. The hydraulic servo motor is stably installed in a penetrating mode through a component installation plate in the straightening installation base, then heat dissipation is conducted on the hydraulic servo motor through a straightening heat dissipation net plate, and then an electric signal is converted into hydraulic energy through an electro-hydraulic servo valve of the hydraulic servo motor to drive an execution element. According to the metal pressure straightening device, metal pressure straightening is achieved, high-precision motion control is achieved by feeding back and adjusting output in real time, then a telescopic end in a hydraulic servo motor is used for driving a hydraulic mounting plate to straighten and extrude the metal, slow pressure straightening can be conducted on the metal, rapid springback cannot occur when the metal is straightened, and therefore the precision of metal pressure straightening is improved.

The invention discloses a jet pipe electro-hydraulic servo valve adapting to a wide temperature range environment, and relates to the technical field of electro-hydraulic servo control, the jet pipe electro-hydraulic servo valve comprises a valve body, a valve sleeve and a locking ring, the valve body is made of 7075 aluminum alloy, the valve sleeve is made of 440C stainless steel, is assembled in a mounting hole of the valve body and is axially locked and fixed through the locking ring, and the valve sleeve is fixedly connected with the valve body. Gaskets made of polyether-ether-ketone materials are arranged at the two ends of the valve sleeve, and the locking ring axially locks the valve sleeve by pressing the gaskets. By introducing the gasket made of the polyether-ether-ketone material, not only is the problem of mismatching of thermal deformation of the valve sleeve and the valve body solved, but also the reliability of the servo valve is further improved and the service life of the servo valve is further prolonged by utilizing the vibration reduction, wear resistance and self-lubricating characteristics of the polyether-ether-ketone material.

This invention provides a π-axis reduction transmission mechanism for a two-dimensional electro-hydraulic servo valve, comprising a connecting housing, with an electro-mechanical converter and a valve body respectively connected to its two sides. An independent wet operating chamber and a dry operating chamber are arranged side-by-side within the connecting housing. A primary torque amplification mechanism is disposed in the dry operating chamber, and a secondary torque amplification mechanism is disposed in the wet operating chamber. The primary and secondary torque amplification mechanisms are connected. The secondary torque amplification mechanism includes a valve core lever and a π-axis, with the valve core lever movably connected to the π-axis at its lower end. The π-axis is integrally formed. Compared to existing technologies, the transmission mechanism of this invention eliminates complex machining steps such as grinding, making it easier to manufacture and applicable to industrial production.

The present application belongs to the field of mechanical hydraulic pressure, and particularly relates to a high-frequency pulsation filtering type electro-hydraulic servo valve, which comprises a torque motor part, a hydraulic pressure amplification stage part, a power stage spool valve part, a turbine pressure compensation part, a pulsation filtering part and a shell; the torque motor part is installed on the upper side of the shell, and the hydraulic pressure amplification stage part, the power stage spool valve part, the turbine pressure compensation part and the pulsation filtering part are all installed in the shell; the present application can guarantee that the servo valve does not howl in all hydraulic systems, can slow down the internal pressure fluctuation of the servo valve, and thus effectively avoids high-frequency oscillation of the servo valve.

This invention discloses a displacement adjustment structure for a hydraulic servo cylinder mechanism, belonging to the technical field of hydraulic servo cylinders. It includes a cylinder barrel, a cylinder liner connected to the front end of the cylinder barrel via a stepped fit, a cylinder head threadedly connected to the front end of the cylinder liner, a movable piston and a piston rod fixedly connected to the movable piston between the cylinder barrel and the cylinder head, an electro-hydraulic servo valve installed at the top of the cylinder barrel, and a return oil chamber provided at the top of the cylinder liner, communicating with the interior of the cylinder liner. The adjustment component provided by this invention, through the cooperation of the sealing plug, sealing column, and oil passage hole in the adjustment component, achieves manual assisted adjustment of the return oil flow of the hydraulic servo cylinder, and can perform graded control of the hydraulic oil return speed according to different working conditions. This solves the technical problems of existing hydraulic servo cylinders, such as difficulty in manually adjusting the return oil volume outside the electronic control system, large hydraulic shock, and poor displacement control stability.