30results about How to "Control the degree of opening" patented technology

An ejector includes a nozzle and a needle valve formed in a tapered shape. The needle valve controls a throttle opening degree of the nozzle from a minimum degree to a maximum degree while an end section of the needle valve is positioned on a downstream side with respect to a throat section of the nozzle. Besides, a cross-sectional area of a nozzle diffuser is formed to be substantially constant, downstream of the throat section. Thus, a cross-sectional area of a substantial refrigerant passage defined by an inner surface of the nozzle and the needle valve is gradually widened in accordance with the tapered shape of the needle valve. Therefore, pressure loss accompanied with a rapid expanding can be suppressed. As a result, the throttle opening degree of the nozzle can be controlled while improving nozzle efficiency and ejector efficiency.

This invention is a cold air providing component for fridge drawer type chilling box. It includes connecting opening, channel, box cover, air inlet opening, air outlet opening and flow adjusting device. The box cover is hollow structure. The air inlet opening, which is adjacent to connecting opening, is arranged on box cover. The air outlet openings are arranged on the lower plate of box cover in a line. The channel communicates to connecting opening and air inlet opening. The flow adjusting device includes handle, rotating bar, directing acting bar, baffling plate and locating plate. The center part of rotating bar is arranged on the rotating shaft. One end connects to handle and can rotate. The other end connects to directly acting bar and can rotate. The end part of this end is located by locating plate seriously. This invention can avoid cold air entering into other parts except the drawer type storage chamber. It can adjust the cold air provided to drawer type chilling box exactly.

The invention discloses an inflation protection device and method for welding of a pipe fitting, wherein the device is applied in gas protection of the inner wall of a weld joint when butting and welding the pipe fitting and comprises a middle shaft pipe, an expansion gasbag, a sliding plate, a support rod component capable of grasping and loosening the pipe wall, a spray head support extending from one end of the middle shaft pipe and a jet head arranged at the end part of the spray head support. A support rod can grasp and loosen the pipe wall through expansion and contraction of the expansion gasbag, a spray head can rotate directly, when in welding, the jet head can be controlled to aim at the welding part of the weld joint and move along with the welding part. The inflation protection device can pertinently provide gas protection according to the welding part, not only reliably provide anti-oxidation protection for the welding position and can be used for greatly reducing the amount of nitrogen, but also can be simultaneously used for shortening the primary preparation time of welding, and further can be used fro reducing the cost and improving the efficiency under the situation of improving the welding quality.

The invention discloses a water mixing device for floor heating. The water mixing device for floor heating comprises a water mixing valve which comprises a water mixing valve body and an adjustable non-return device, the water mixing valve body is a columnar hollow pipe, and the adjustable non-return device comprises a partition and an adjusting mechanism. The partition is arranged in the water mixing valve body to partition the water mixing valve body into a first cavity and a second cavity, and is provided with a water through hole. The adjusting device is provided with an adjusting valve core, and the adjusting valve core is positioned on one side of the first cavity and matched with the water through hole to adjust volume of water passing through the water through hole. The water mixing valve body is provided with a high-temperature water inlet, a mixed water outlet, a low-temperature water inlet and a low-temperature water return port, the high-temperature water inlet and the mixed water outlet are respectively communicated with the first cavity, and the low-temperature water inlet and the low-temperature water return port are respectively communicated with the second cavity. By the aid of the water mixing device for floor heating, the technical problem of complex structure of water mixing devices for floor heating in the prior art is solved.

The invention relates to an assembly type PC prefabricated component manufacturing processing method which adopts following processing machinery. The processing machinery comprises a bottom plate anda mould arranged on the bottom plate, wherein a framework of steel reinforcement is arranged inside the mould; a material distributing device is arranged above the mould; and a vibrating device is mounted on the bottom of the material distributing device. According to the assembly type PC prefabricated component manufacturing processing method disclosed by the invention, an unloading mechanism isarranged below a hopper, and telescopic length of a first electric pushing rod can be controlled to control opening degree of a dropping hole, so that a dropping rate of concrete is changed. An edge vibrating mechanism below a hopper is matched with a center vibrating mechanism, so that vibrating efficiency is improved; the edge vibrating mechanism utilizes the lever principle to vibrate concreteoutside the framework of steel reinforcement; and the center vibrating mechanism utilizes gear rack transmission to vibrate concrete in the framework of steel reinforcement, so that horizontal movement along with the hopper is achieved during vertical vibrating, and therefore, a vibrating range of the vibrating device is expanded.

The invention discloses a high-precision variable air volume venturi valve which comprises a valve body shell, a valve element arranged in the valve body shell, an air volume adjusting mechanism and a moving rod connected with the air volume adjusting mechanism, and the moving rod is sleeved with the valve element; the air volume adjusting mechanism comprises a mounting plate fixed to the valve body shell, an air valve actuator mounted on the mounting plate, a connecting spline, a connecting rod connected with the connecting spline and a transmission rod rotationally mounted on the mounting plate, and one end of the transmission rod penetrates through the valve body shell to be connected with the moving rod; the other end of the transmission rod is fixedly connected with the connecting rod; and an output gear ring of an air valve actuator is arranged on the connecting spline in a sleeving mode, and the air valve actuator is used for driving the connecting spline and the connecting rod to rotate. The rotating process is controlled through the air valve actuator, and the rotating angle of the air valve actuator corresponds to the moving position of the valve element, so that the opening degree of the valve element is controlled, and accurate adjustment of the air volume is achieved.

An ejector includes a nozzle and a needle valve formed in a tapered shape. The needle valve controls a throttle opening degree of the nozzle from a minimum degree to a maximum degree while an end section of the needle valve is positioned on a downstream side with respect to a throat section of the nozzle. Besides, a cross-sectional area of a nozzle diffuser is formed to be substantially constant, downstream of the throat section. Thus, a cross-sectional area of a substantial refrigerant passage defined by an inner surface of the nozzle and the needle valve is gradually widened in accordance with the tapered shape of the needle valve. Therefore, pressure loss accompanied with a rapid expanding can be suppressed. As a result, the throttle opening degree of the nozzle can be controlled while improving nozzle efficiency and ejector efficiency.

The invention relates to a sectional type numerical control self-centering center frame comprising a body, two side arms, a driving cam, a cross arm, two return mechanisms and a pushing oil cylinder assembly, wherein circular holes of the two side arms are respectively and movably fixed in an opening formed in the outer edge of the top of the body through two rotation supports; the bottom ends of the two side arms are respectively and movably connected with driven grooves of the return mechanisms; two ends of the bottom of the driving cam are respectively and movably connected with the driving grooves of the return mechanisms; the bottom end of the return mechanism is movably connected with the bottom end of the body; a straight groove is formed in the body, and is communicated with the top and the bottom of the body; the cross arm is arranged inside the straight groove; the cross arm is fixed with the middle part of the bottom end of the driving cam; and the pushing oil cylinder assembly is fixed at the middle part of the outer wall of the body and is fixed with the cross arm. The dimension range of workpieces that can be held by the sectional type numerical control self-centering center frame is wide; and the sectional type numerical control self-centering center frame is accurate in clamping, high in reliability and the like.

The invention discloses a device for automatically brushing lime on tree trunks, which includes a box body connected to a brushing structure through a hose; wherein the brushing structure includes a circular mechanical clamp connected with the hose, and also includes a Lifting structure for the mechanical clamp to move up and down. It can realize mechanized plastering, improves the quality and efficiency of landscape tree plastering work, reduces labor intensity and saves human resources.

A disinfection device for dermatological treatment is disclosed in the invention, and comprises a supporting plate, a telescopic rod, a medicine storage cylinder, a driving rod, an opening mechanism, a nursing shell and nursing wheels, and the bottom of the supporting plate is connected with supporting legs; the telescopic rod is arranged at the top of the supporting plate; the medicine storage cylinder is connected to the bottom of the supporting plate and internally provided with a piston rod, and the top end of the piston rod penetrates out of the supporting plate; the driving rod is provided with a first tooth groove and penetrates through the supporting plate, the top end of the driving rod is connected with the telescopic end of the telescopic rod through a connecting piece, and the position close to the top end is connected with one end of the piston rod through a connecting piece; and the opening mechanism is arranged on one side of the medicine storage cylinder, the nursing shell is arranged at the bottom of the medicine storage cylinder, the nursing wheel is rotationally arranged in the nursing shell, one side of the nursing wheel is connected with the driving shaft, and the nursing cotton is wound around the peripheral side of the nursing wheel.The device can wipe and disinfect the skin surface at the gap with liquid medicine, and is convenient to use and uniform in wiping.

The invention aims to provide a high-pressure common-rail oil injector based on electromagnetic proportional valve oil injection rule flexibility and controllability. A pressure storage cavity and an oil return path are arranged in an oil injector body, an additional electromagnetic proportional valve liquid return cavity is arranged below an additional electromagnetic proportional valve part, an electromagnetic valve oil return cavity is arranged below an electromagnetic valve part, a control cavity is arranged above an oil nozzle part, a needle valve reset spring cavity is formed in the upper portion of an oil nozzle, an oil containing groove is formed in the middle of the oil nozzle part, the pressure storage cavity communicates with the control cavity and the oil containing groove, the control cavity communicates with a control cavity additional oil return path, and the pressure storage cavity communicates with the control cavity through a control cavity oil inlet throttling hole. According to the oil injector, opening of the additional oil return path can be controlled at any time in the oil injection process to accelerate oil return, the opening degree of the control cavity additional oil return path can be controlled by controlling signals input into an additional electromagnetic proportional valve coil, and therefore a slow-first and fast-second oil injection rule curve can be further adjusted, and in the working process, flexibility and controllability of the oil injection rule can be realized.

The invention discloses a hanger with multiple sealing sections and manufacturing equipment thereof. The hanger comprises a first motor arranged on a bottom plate, wherein an electric chuck is arranged on the first motor, a storage unit is arranged on the bottom plate, an outlet and an inlet are formed in the storage unit, and the outlet is located above the electric chuck; a lifting unit is further arranged on the bottom plate, a clamping unit is arranged at the lifting end of the lifting unit, a turning tool is rotationally arranged on the clamping unit, the turning tool corresponds to the outer wall of a hanger blank, and the clamping unit controls the machining depth of the turning tool through a transmission unit; and the outlet and the electric chuck are both located on the lifting stroke of the clamping end of the clamping unit. According to the hanger, a limiting boss, an annular groove and an annular sealing groove of the outer wall of the hanger blank can be machined through the turning tool, the hanger blank can be clamped through the clamping unit for feeding, a sealing ring can be installed on the machined annular sealing groove through a sealing ring installation unit, and the production efficiency is high.

The invention discloses a shield tunneling machine cutter head convenient to adjust a cutter distance. The shield tunneling machine cutterhead convenient to adjust the cutter distance comprises a body and four mounting plates, the four mounting plates are annularly arrayed at the top of the body, a plurality of cutter bodies are fixed to the top of each mounting plate, an inserting mechanism used for mounting the mounting plates is arranged below each mounting plate, each inserting mechanism is connected with an angle deflection mechanism used for adjusting the angle of the mounting plate, the deflection mechanism is further connected with a compensation mechanism used for further adjusting the angle of the mounting plate, an angle monitoring assembly used for monitoring the angle of the mounting plate in real time is further arranged in the body, a mud water bin is formed in the portion, below the mounting plate, in the body, and a freezing mechanism used for freezing mud is arranged between the mud water bin and the mounting plate. According to the shield tunneling machine cutter head, the single mounting plate is detached, so that a single cutter can be conveniently replaced and maintained, and the working efficiency can be further improved.

The invention discloses a welding fume monitoring system for a welding workplace. The welding fume monitoring system comprises a main control module; a smoke exhaust channel, mounted in a welding workplace; wherein the smoke exhaust channel is provided with a fume inlet end and a fume outlet end, the fume inlet end is arranged at the position where welding smoke is generated during welding operation, and the fume outlet end is communicated with the outside; a first fume sensor, electrically connected with the main control module and arranged at the fume inlet end; a second fume sensor, electrically connected with the main control module and arranged at the fume outlet end; an exhaust device, electrically connected with the main control module, arranged at the fume inlet end and used for sucking generated fume from the fume inlet end through the exhaust device and exhausting the fume from the fume outlet end during welding operation; a main control module, controlling the opening degreeof the exhaust device according to the inlet fume concentration and the outlet fume concentration. The invention further discloses a welding fume monitoring method for the welding workplace.

The invention discloses a wireless private network and public network communication terminal which comprises a containing box, a top plate is installed at the top of the containing box, an outer shell is connected to the top of the top plate in a clamped mode, a terminal body is connected to the inner side of the outer shell in a sleeved mode, a containing cavity is formed in the inner side of the containing box, and two sets of parallel driving motors are installed at the bottom of the inner side of the containing cavity. An adjusting mechanism is connected to the top of the driving motor and comprises a fixing plate, a clamping rail and a vertical gear are installed on the outer side of the fixing plate, a toothed bar is clamped to the outer side of the clamping rail, one side of the toothed bar is meshed with the outer side of the vertical gear, the outer shell comprises a shell sleeve, an inner cavity is formed in the inner side of the shell sleeve, and a heat dissipation groove is formed in the bottom of the inner side of the shell sleeve. A clamping strip is installed on the top of the inner side of the shell sleeve, and sliding rails are installed on the two sides of the inner side of the shell sleeve. The emergency rescue communication device integrates a private network and a public network, is small in size, light in weight and convenient to carry, and can solve the problems of real-time audio and video, positioning and data transmission of emergency rescue.

The invention relates to the field of medical instruments, and discloses amulti-degree-of-freedom instrument assembly of a single-port surgical robot. The assembly comprises: a catheter; a plurality of operation tail ends, wherein the operation tail ends are formed by sequentially connecting the following structures: a first rigid pipeline, a first flexible pipeline, a second rigid pipeline, a second flexible pipeline and an operation instrument, the first rigid pipeline is arranged in the catheter in a penetrating mode, a hollow channel is formed in the first rigid pipeline and the second rigid pipeline, a plurality of partition plates are arranged in the first soft pipeline and the second soft pipeline, a plurality of through holes are formed in the partition plates, and steel wires penetrate through the hollow channel and the through holes; and an opening mechanism which comprises a main push rod and a plurality of supporting rods. According to the multi-degree-of-freedom instrumentassembly of the single-hole surgical robot, various surgical instruments can be placed only through one opening, a plurality of openings do not need to be formed, surgical wounds and the size of equipment are greatly reduced, and operations of the surgical instruments is independent, accurate and reliable.

The invention relates to a sectional type numerical control self-centering center frame comprising a body, two side arms, a driving cam, a cross arm, two return mechanisms and a pushing oil cylinder assembly, wherein circular holes of the two side arms are respectively and movably fixed in an opening formed in the outer edge of the top of the body through two rotation supports; the bottom ends of the two side arms are respectively and movably connected with driven grooves of the return mechanisms; two ends of the bottom of the driving cam are respectively and movably connected with the driving grooves of the return mechanisms; the bottom end of the return mechanism is movably connected with the bottom end of the body; a straight groove is formed in the body, and is communicated with the top and the bottom of the body; the cross arm is arranged inside the straight groove; the cross arm is fixed with the middle part of the bottom end of the driving cam; and the pushing oil cylinder assembly is fixed at the middle part of the outer wall of the body and is fixed with the cross arm. The dimension range of workpieces that can be held by the sectional type numerical control self-centering center frame is wide; and the sectional type numerical control self-centering center frame is accurate in clamping, high in reliability and the like.

The invention provides metal plate welding equipment for general machinery, and relates to the field of metal plate welding equipment. The metal plate welding equipment for the general machinery comprises a workbench and a material control mechanism, the material control mechanism is arranged at the transfer cavity, and the material control mechanism is used for controlling the material storage amount in the transfer cavity. According to the metal plate welding equipment for the general machinery, the upper plate moves downwards to drive the conducting strip to move in the vertical shell relative to the resistance plate, the resistance value of the resistance plate is conveniently adjusted according to the thickness of the metal plate, and therefore the amount of deposited metal needing to be used can be automatically and accurately controlled; and when the first sliding plate completely moves back to the initial position and abuts against a top plate rod, a third induction contact piece moves to be close to a fourth induction contact piece, two second electromagnets are powered on to generate magnetism to attract two sliding buckles to slide to be away from two rack plates, and at the moment, the discharging amount of deposited metal can be accurately controlled according to the thickness of a metal plate.

The invention provides a carbon dioxide pipeline flow regulation and differential pressure flowmeter precision test and calibration system which is applied to pipelines for conveying liquid, dense-phase and supercritical carbon dioxide. According to the carbon dioxide pipeline differential pressure flowmeter precision test and calibration system, a mass flow meter is used as a reference flow meter, and the precision and correction coefficients of the differential pressure flow meters in all branch pipelines of the carbon dioxide pipeline are tested and calculated in combination with a carbon dioxide density compensation method; according to carbon dioxide pipeline flow regulation system, the mass flow value of carbon dioxide in each branch pipeline is calculated according to differential pressure data monitored by differential pressure flow meters in each branch pipeline by applying the correction factor and combining the carbon dioxide density compensation method, and thus he openingdegree of the electric control valves in all the branch pipelines is controlled, and thus the flow of carbon dioxide in each branch pipeline can be accurately controlled. Therefore, the system has theadvantages of cost saving and accurate control.

The invention relates to the field of medical instruments, and discloses a multi-degree-of-freedom instrument assembly of a single-hole surgical robot, comprising: a catheter; , the second rigid pipeline, the second flexible pipeline, and the surgical instrument; the first rigid pipeline is penetrated in the catheter, the first rigid pipeline and the second rigid pipeline are provided with hollow channels, and the first flexible pipeline and the second flexible pipeline are provided with hollow channels. The pipeline is provided with a number of partitions, the partitions are provided with a number of through holes, the hollow channel and the through holes are provided with steel wires; the spreading mechanism includes a main push rod and a number of support rods. The single-hole surgical robot multi-degree-of-freedom instrument assembly of the present invention only needs to pass through one opening to insert a variety of surgical instruments without opening multiple openings, which will greatly reduce the surgical trauma and the volume of the equipment, and the operations of each surgical instrument are independent of each other. Precise and reliable.

The invention belongs to the technical field of equipment of automobile accessories, and particularly discloses an intelligent fragrance machine and a control system thereof. The intelligent fragrancemachine comprises an automobile main screen for receiving a signal input from a user, an automobile circuit board for receiving signals from the main screen, an intelligent circuit board for receiving signals from the automobile circuit board and performing action commands, a motor assembly and a fan assembly for receiving the commands of the intelligent circuit board, a touch and talk pen pointfor identifying perfumes and a server for storing icon information of the perfumes. According to the scheme, a driver can choose the scent of a refreshing fragrance to enable long-distance driving tobe in a pleasant atmosphere; and when a passenger on a front passenger seat gets on an automobile, the passenger can further select a favorite fragrance scent through the main screen to expand the fragrance to achieve the most comfortable and relaxing atmosphere.

The invention relates to a transformation method from closed-cell foamed plastics to open-cell foamed plastics based on thermal driving shape memory effect, wherein the method includes steps of a, manufacturing a closed-cell shaped memory polymer foamed plastics by an ordinary closed-cell foam plastics manufacturing method; b, compressing the manufactured closed-cell foamed plastics under room temperature or above temperature, wherein the final open-cell product has different cell opening degrees for different compression rates; c, sufficiently heating the compressed foamed plastics in the high temperature which is equal to or higher than the transformation temperature thereof, sufficiently heating for 10-over 30 minutes by depending on the size of the foamed plastics; d, cooling the foamed plastics to room temperature. Due to the shape memory effect of the material, the heated foamed plastics can basically recover the dimension before compression, but the foamed plastics at the moment has been transformed to be the open-cell foamed plastics. The method is simple in steps, and needs not complex machine devices, is low in cost, fast in transformation process, and free from chemical change in full process; the final cell opening rate can be well controlled.

The invention discloses an automobile hydraulic lifting machine with a safety protection function. The automobile hydraulic lifting machine comprises brackets, a booster pump, an oil storage tank, a first flow control valve, a second flow control valve, a PLC and a Bluetooth signal transmitter; the upper portions of the brackets are fixedly connected through a fixing rod, and a carrying table is mounted on the positions, below the fixing rod, of the brackets; and the carrying table is slidably connected with the brackets through sliding blocks, the sliding blocks are fixedly connected with thecarrying table through connecting rods, the sliding blocks are arranged in sliding grooves formed in the brackets, and hydraulic rods are mounted on the lower portions of the sliding blocks. According to the automobile hydraulic lifting machine with the safety protection function, by arranging the brackets, the booster pump, the oil storage tank, the first flow control valve, the second flow control valve, the PLC and the Bluetooth signal transmitter, the problems that in the using process, the hydraulic rods are prone to being damaged by the outside, the service life is decreased, the telescopic speed of the hydraulic rods is difficult to control, and using is inconvenient are solved.

The invention discloses a muddy water slurry dewatering device based on a water pool and a dewatering method of the muddy water slurry dewatering device. The muddy water slurry dewatering device comprises a plurality of water absorption assemblies arranged below an assembly plate, wherein the assembly plate is installed over a water storage tank and a muddy water tank through supporting columns, a plurality of extrusion roller sets are arranged above the water storage tank, each extrusion roller set comprises two symmetrically-arranged extrusion rollers, and the extrusion rollers are driven by a driving device; and the water absorption assembly comprises a sliding piece and a plurality of water absorption components arranged below the sliding piece, each water absorption component comprises a water filtering tank and a water absorption plate which are arranged under the sliding piece, a plurality of winding devices are embedded in the sliding piece and the assembling plate respectively, and the winding devices are connected with the water filtering tanks and the water absorption plates through pre-tightening ropes respectively. Muddy water in the waste water tank is gradually dewatered through cooperation of the water absorption plates and the water filtering tanks, purified water is collected, and recycling of water resources is achieved. Purified water in the water absorption plates is stored in the water storage tank through the extrusion roller sets, and sludge dewatering and drying are further achieved.

This invention is a cold air providing component for fridge drawer type chilling box. It includes connecting opening, channel, box cover, air inlet opening, air outlet opening and flow adjusting device. The box cover is hollow structure. The air inlet opening, which is adjacent to connecting opening, is arranged on box cover. The air outlet openings are arranged on the lower plate of box cover ina line. The channel communicates to connecting opening and air inlet opening. The flow adjusting device includes handle, rotating bar, directing acting bar, baffling plate and locating plate. The center part of rotating bar is arranged on the rotating shaft. One end connects to handle and can rotate. The other end connects to directly acting bar and can rotate. The end part of this end is locatedby locating plate seriously. This invention can avoid cold air entering into other parts except the drawer type storage chamber. It can adjust the cold air provided to drawer type chilling box exactly.

The invention provides a control method, a control device and a cooking device. The control method comprises the following steps that a heating device of the cooking device is controlled to carrying out heating at first preset power after a start signal is received, and the power-on voltage of a coil assembly is a first preset voltage; when the temperature in the cooking device reaches a preset temperature, or the lasting time in the voltage starting stage reaches a first preset time duration, or the pressure in the cooking device reaches a first preset pressure, the heating device is controlled to carry out heating at second preset power, the power-on voltage of the coil assembly is set as a second preset voltage according to the variety and / or eating state of cooked food, a steam exhaust valve is made in an opened state, and the opening degree of the steam exhaust valve is controlled so as to control the pressure in the cooking device; when the lasting time in the pressure keeping stage reaches a second time duration, the heating device is controlled to stop heating. By means of the control method, continuous boiling in the cooking device can be achieved, and the pressure in the cooking device can be dynamically adjusted.

The invention relates to an assembled PC prefabricated component manufacturing and processing machine and its use method. The processing machine includes a bottom plate and a mold arranged on the bottom plate. A steel skeleton is arranged inside the mold, and a material distributing device is arranged above the mold. The material distributing device A vibrating device is installed at the bottom. In the present invention, by setting a discharge mechanism under the hopper, the opening degree of the discharge opening can be controlled by controlling the telescopic length of the first electric push rod, thereby changing the concrete discharge rate; The tamping mechanism and the central vibrating mechanism cooperate to improve the vibrating efficiency. The edge vibrating mechanism uses the principle of leverage to vibrate the concrete outside the steel frame, and the central vibrating mechanism uses rack and pinion transmission to vibrate the concrete inside the steel frame. , move horizontally with the hopper while vibrating vertically, expanding the vibrating range of the vibrating device.

The invention provides an electric hydraulic executing device, comprising a bracket with a buckle at the lower end. The top end of a pull rod arranged at the top end of the bracket is fiedly connected with a piston; a cylinder body is sleeved at the outer side of the piston; the upper end of a resetting spring sleeved at the outer side of the cylinder body is abutted against the cylinder body, and the lower end of the resetting spring is abutted against the bracket; the piston and the cylinder body are matched below the middle part and the bottom part of the piston, so as to form a constant-pressure oil cavity and a high-pressure oil cavity, which are isolated in a sealed manner; an output shaft of a motor arranged in a cavity between a sealing cover which is fixedly connected at the top end of the piston and the top of the piston passes through the lower parts of the constant-pressure oil cavity and the lower part of the piston, and is connected with a gear pump which is internally embedded at the bottom of the piston; an oil inlet of the gear pump is communicated with the constant-pressure oil cavity through an oil inlet channel, and an oil outlet of the gear pump is communicated with the high-pressure oil cavity; the piston between the constant-pressure oil cavity and the high-pressure oil cavity is provided with an oil return channel provided with an oil return control mechanism; a driving rod provided with a mutual control plate is arranged at the bottom of the cylinder body; and the motor, the gear pump and the oil return control mechanism are respectively connected with a control device. The electric hydraulic executing device has the advantages of small size, reliable property and high control precision.