133 results about "Electrohydraulic servo valve" patented technology

The invention discloses a double-valve heterogeneous fuel regulator, an aero-engine and a control valve switching method.The double-valve heterogeneous fuel regulator comprises an electro-hydraulic servo valve set, and the electro-hydraulic servo valve set comprises a main control electro-hydraulic servo valve, a standby electro-hydraulic servo valve, a conversion valve and a conversion electromagnetic valve; the conversion electromagnetic valve is used for controlling the inlet end of the conversion valve to be connected with a master control electro-hydraulic servo valve or a standby electro-hydraulic servo valve in a switchable mode, and the internal structure of the standby electro-hydraulic servo valve is different from the internal structure of the master control electro-hydraulic servo valve. The size of a fuel oil flow channel in the standby electro-hydraulic servo valve is larger than that of a fuel oil flow channel in the master control electro-hydraulic servo valve. When high-precision fuel oil flow control is met, simultaneous faults of the standby electro-hydraulic servo valve and the main control electro-hydraulic servo valve caused by the same pollutants are avoided, the failure rate of clamping stagnation and blockage of the double-valve heterogeneous fuel oil regulator can be reduced, and therefore the reliability and safety of fuel oil and guide vane control of the fuel oil electronic control regulator are improved.

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 utility model relates to the technical field of casting equipment, and provides a pump control crystallizer hydraulic vibration device and a continuous caster, the vibration device comprises a connecting frame and at least one vibration unit arranged on the connecting frame, and each vibration unit comprises a fixed frame connected with the connecting frame; the vibration frame is movably arranged in the fixed frame; the guide mechanism is connected between the fixed frame and the vibration frame; the driving mechanism is used for driving the vibration frame to vibrate up and down relative to the fixed frame, the driving mechanism is provided with a shell connected with the fixed frame, a servo motor, a bidirectional hydraulic pump and a driving hydraulic cylinder which are connected in sequence are arranged in the shell, a cylinder rod of the driving hydraulic cylinder is connected with the vibration frame, and the driving hydraulic cylinder is connected with the fixed frame. The motor is used for driving the vibration frame to vibrate up and down. The electro-hydraulic servo valve can solve the problems that an electro-hydraulic servo valve in an existing vibration device is high in oil cleanliness requirement, high in construction, operation and maintenance cost and low in efficiency.

The present invention belongs to the field of electro-hydraulic servo valves and relates to a combined processing method for the armature assembly of an electro-hydraulic servo valve. The technological sequence is as follows: combining the feedback rod and the support tube into a support rod assembly → performing a sealing test on the feedback rod → machining the flat surface and jet grooves on the feedback rod → pressing the spring tube → removing the extended end → combining and welding the armature into an armature assembly → performing a sealing test on the spring tube. This method avoids the risk of overall scrapping once oil leakage occurs during the sealing test after the overall combination of the armature assembly in the past, saving manufacturing costs. Another part is that a combined fixture for the support rod assembly and a pressing fixture for the spring tube-support rod assembly are designed, and by designing the process extended end and process positioning holes of the parts, the accurate conversion of the reference is achieved, solving the problem that combination cannot be realized by traditional methods.

The invention discloses a wind tunnel rotor wing type high-frequency dynamic test driving system and an optimization control method, and belongs to the technical field of wind tunnel testing. In order to solve the problem of high-precision control of amplitude and phase of high-frequency sinusoidal motion, a high-frequency hydraulic oscillating cylinder is fixedly mounted on a first supporting seat, a rotating shaft of the high-frequency hydraulic oscillating cylinder is connected with one end of a wing-shaped test piece through an expansion sleeve, and the free end of the wing-shaped test piece is supported on a second supporting seat; a first photoelectric encoder is mounted on the high-frequency hydraulic oscillating cylinder, and a second photoelectric encoder is mounted at the free end of the airfoil test piece; hydraulic oil of the hydraulic oil source pump station acts on the high-frequency hydraulic swing cylinder through the electro-hydraulic servo valve, and hydraulic oil in a bearing chamber of the high-frequency hydraulic swing cylinder is discharged into the hydraulic oil source pump station through the oil well pump. The electro-hydraulic servo valve, the first photoelectric encoder, the second photoelectric encoder and the hydraulic oil source pump station are respectively connected with a hydraulic controller, and the hydraulic controller is connected with an upper control computer. According to the invention, the control precision of high-frequency sinusoidal motion is effectively improved.

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 present invention provides a dual-redundant servo valve and its application, belonging to the field of electro-hydraulic servo control; comprising a housing, two sets of electro-hydraulic servo valves and a hydraulic pressure sensor; the two sets of electro-hydraulic servo valves are connected in parallel and arranged in the housing, respectively defined as a left valve and a right valve; the hydraulic pressure of the left valve is monitored by the hydraulic pressure sensor; the left valve is set as the main valve, and the right valve is set as the backup valve; when the right valve is a hot backup, the two sets of electro-hydraulic servo valves are started at the same time to control the supply pressure, and if one of them fails, the other can independently complete the control target; when the right valve is a cold backup, the backup valve is started only when the main valve fails to complete the control target. The dual-redundant servo valve proposed in the present invention is composed of a pair of twin electro-hydraulic servo valves on a common housing. The reliability model of the left valve and the right valve of the valve system is a parallel relationship. As long as one of the electro-hydraulic servo valves is normal, the dual-redundant servo valve can complete the regulation and control of the output pressure.

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 present invention discloses a modular split drill pipe library, which includes two sets of front connection seats arranged side by side. Fixed bearing seat bases are fixedly arranged on the opposite surfaces of the two sets of front connection seats, and the two sets of fixed bearing seat bases are connected by a lower guide rod and an upper guide rod; a gripper assembly for grasping drill pipes is installed on the upper guide rod, and a chuck library for storing drill pipes is arranged above the gripper assembly. The gripper assembly is used to take out the drill pipes stored in the chuck library for rock drilling. The present invention uses two drill pipe chuck seats with the same structure to form a rod storage device. Each drill pipe chuck seat is equipped with an independent driving device and an angle feedback device. One drill pipe chuck is controlled by a solenoid valve, and the other is controlled by an electro-hydraulic servo valve. The drill pipe chuck controlled by the electro-hydraulic servo valve rotates following the drill pipe chuck controlled by the solenoid valve and maintains synchronization.

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 present application belongs to the field of actuator design and is a parallel multi-purpose actuator, comprising a first actuator, a second actuator, a first valve group, a second valve group, and an electro-hydraulic servo valve; the first actuator comprises a first actuator and a second actuator, the second actuator comprises a third actuator and a fourth actuator, the first actuator and the third actuator form a synchronous actuator, and the second actuator and the fourth actuator form a synchronous actuator; the movement synchronization of multiple actuators is achieved through synchronous actuators and synchronous pipelines: compared with the scheme of parallel control of each actuator, it avoids the asynchronous movement of each actuator due to friction and other reasons, and can provide a warning signal when the stuck load is too large and may cause a larger fault. Compared with the scheme of independent control of each actuator, it has the advantages of simple pipelines and low cost. The scheme for achieving motion synchronization is a physical method with extremely high reliability.

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 relates to the technical field of electro-hydraulic servo valves, and discloses an electro-hydraulic servo valve driving force increasing method and an electro-hydraulic servo valve. The lifting method comprises the following steps: 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; calculating the theoretical displacement of a deflection plate of the electro-hydraulic servo valve to be calibrated, correcting the pressure-displacement characteristic curve by applying the deviation between the theoretical displacement and the actual displacement, and finding out the benchmarking displacement of the benchmarking electro-hydraulic servo valve under the constant input current; and constructing a constraint condition, and based on the constraint condition, lifting the theoretical displacement to the benchmarking displacement according to a preset driving force lifting scheme.

The invention relates to the technical field of engine control, and particularly discloses an integral separation type metering fuel oil flow control method and device and a storage medium, and the integral separation type metering fuel oil flow control method comprises the steps that mechanism modeling is conducted on an electro-hydraulic servo valve, and simplification is conducted to obtain an electro-hydraulic servo valve model; modeling the fuel metering device to obtain a fuel metering device model; drawing a control structure block diagram of a controlled object of a control system according to the established electro-hydraulic servo valve model and the established fuel metering device model, and obtaining a transfer function of the controlled object; performing reasonable assumption and simplification on the transfer function of the controlled object; drawing a closed-loop control structure block diagram of a control system based on the simplified transfer function of the controlled object, and designing an integral separation type PI controller for control; and the proportional parameter and the integral parameter of the control system are obtained, and the control system is used for controlling the fuel oil flow metering of the engine fuel oil pump regulator.

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 utility model relates to a valve body fixing mechanism for an electro-hydraulic servo valve test bench, which belongs to the technical field of electro-hydraulic servo valve test benches and comprises a protection bench, a test bench is slidably connected to the front of the protection bench, and a fixing mechanism is arranged on the front of the test bench. The fixing mechanism comprises a mounting plate which is fixedly connected to the top of the test bed. According to the valve body fixing mechanism for the electro-hydraulic servo valve test bed, when an electro-hydraulic servo valve is fixed, a hydraulic rod is started to drive the test bed to move, an auxiliary clamping plate on the outer surface of a limiting rod is used for preliminarily fixing the electro-hydraulic servo valve, so that limiting in the left-right direction is achieved, and then a motor is started to drive a screw to rotate; the movable block moves towards the side away from the auxiliary clamping plate under the condition that the sleeve is arranged, the swing arm is driven to move up and down, then the electro-hydraulic servo valve is fixed in the up-down direction through the clamping plate, the operation time is shortened when the electro-hydraulic servo valve is fixed, and the stability is improved.

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.