126results about How to "Forward and reverse" patented technology

A flat television wall hanging frame comprises a bottom plate fixed with a wall body and a link plate connected with the back of a monitor. The bottom plate is connected with the link pate by a regulating mechanism which comprises a height adjustment device and an oscillation angle adjustment device. The height adjustment device comprises a position block, a leader, a screw mandrel, an elevator, a screw mandrel sleeve, a retainer ring, a motor and a control circuit board which can control the motor to positively and negatively rotate. The oscillation angle adjustment device comprises a guide bar, a linkage gear, a swing pinion and a guide ball block. The flat television wall hanging frame has the following advantages that the axial direction of the screw mandrel is controlled for rotating in clockwise and counterclockwise way by controlling the positive and negative rotation of the motor, and then the screw mandrel is driven to move up and down, thus realizing the up and down moving of the link plate; as the linkage gear connected with the elevator is fixedly connected with a guide ball block, one end of which is embedded in a wave guide groove so that the guide ball block and the linkage gear sway left and right in the up and down moving process, thus realizing the left and right sway of the link plate.

The invention relates to bolt tightening devices, in particular to a torque-control multishaft bolt tightening machine which comprises a driving device, a gear box, an intermediate shaft, torque limiters and a tightening head, wherein one end of the intermediate shaft is connected with the driving device, and the other end penetrates out of the gear box; the outputs of the gear box are provided with transmission shafts, each transmission shaft is connected with an output shaft through the torque limiter, the other end of each output shaft is provided with a fixed plate, the output shaft at the end is connected with one end of a universal shaft after penetrating through the fixed plate, the other end of the universal shaft is connected with a template, and the tightening head is connected with the universal shaft through the template; and the template is provided with a limit switch, and one side of the limit switch is provided with a sensor fixedly connected on the template. The invention has the advantages of high efficiency, simple structure, high integration level, strong adaptability, wide application range and the like, and can realize multiple functions of reverse rotation, control on magnitude of moment, speed regulation and the like.

The invention designs a movement separation spiral multifunctional food mixing machine. The movement separation spiral multifunctional food mixing machine comprises a spiral mixer, a mixing tank, a movement separation mechanism, a lifting device and a dough scraping device, wherein the movement separation mechanism can meet the power demand of all movements in the mixing machine by one motor; when the motor rotates forwards, materials are mixed by the mixer at different speeds, and when the motor rotates reversely, the mixing tank ascends or descends; due to the spiral and rodless designs of the spiral mixer, the spiral mixer can be used for mixing in a wide range, overcomes the phenomenon of automatic material climbing, and improves the structural performance of the mixer; and the dough scraping device can accelerate the rolling of the materials in the mixing tank so as to improve the mixing effect. The multifunctional food mixing machine overcomes the shortcomings of a conventional mixing machine that a plurality of power sources are needed and the mixing efficiency is low, thus being very beneficial to the production and generalization of the mixing machine. According to the mixing machine, the production cost is reduced, the mixing is more sufficient, and the mixing time is greatly shortened.

The invention discloses a seed drying device facilitating discharging. The seed drying device comprises a base and a drying tank. Both left and right sides of the top of the base are fixedly providedwith a left vertical plate and a right vertical plate symmetrically. The drying tank is installed between the left vertical plate and the right vertical plate. According to the seed drying device, thedrying tank can be controlled to lean after drying, so that dispersed seeds in the drying tank concentrate to a discharging door so that discharging is convenient and more thorough. Through the arrangement of a driving mechanism, positive and negative rotation of the drying tank is achieved and the flipping effect of the seeds in the drying tank is enhanced. Materials are heated evenly and the drying effect is ensured. A sieve plate capable of vibrating left and right is also installed so that dried seeds can be screened. Rotation of the drying tank and vibration of the sieve plate can be achieved through one motor and operation is more convenient.

The invention provides a halbach birotor self-sliding wide range speed regulation permanent magnet hub motor for an electric vehicle. The halbach birotor self-sliding wide range speed regulation permanent magnetism hub motor for an electric vehicle includes barrel-shaped inner and outer rotors, a rotatable stator with inner and outer double layer armature windings, two end caps with special structures, an automatic sliding structure fully utilizing mutual coordination of permanent magnet attractive force and a freewheel clutch, and a double reinforcing structure utilizing an electromagnetic clutch. Besides, the hub motor also utilizes a design of a wireless transmission position sensor signal, a sectional type speed regulation design, Halbach array permanent magnet setting, and a novel heat radiation design, and then becomes a unique motor after being integrated with the other patent: self-sliding motor intelligent cruise and PWM and SVPWM control conversion.

The invention belongs to the technical field of general agricultural machinery for sowing or fertilizing and particularly discloses a device for tomato planting. The device comprises a base and a mixing drum. The mixing drum is fixed to the base. An extrusion part is arranged in the mixing drum. The mixing drum is provided with a driving mechanism. The extrusion part is driven by the driving mechanism. A stirring mechanism is arranged in the mixing drum. The driving mechanism drives the stirring mechanism. The side wall of the mixing drum is provided with a feeding port for feeding nutrient soil, tomato seeds and dry silica gel particles. The lower end of the mixing drum is provided with a discharge port. The lower end of the discharge port is connected to an extrusion mechanism for extruding and cutting the materials to obtain particles. The extrusion mechanism is driven by the driving mechanism. The base is provided with a catapult mechanism. The catapult mechanism comprises a sowingtank below the discharge port. A pushing plate for pushing materials is slidably connected to the interior of the sowing tank and is driven by the driving mechanism. The device solves the problem that the existing tomato sowing method has complicated processes and needs peasant bending work.

The invention discloses a dual waste scrap treatment device for a numerically controlled lathe. The dual waste scrap treatment device comprises a bottom scrap discharge device and a side wall scrap discharge device, wherein the bottom scrap discharge device comprises a conveying belt of the dual waste scrap treatment device, which is used for discharging waste scrap out of the dual waste scrap treatment device and a scrap discharge groove used for accommodating waste scraps; the conveying belt is used as a groove bottom of the scrap discharge groove; the side wall scrap discharge device is arranged above the scrap discharge groove and comprises a scrapping plate fitted with a rack housing of the numerically controlled lathe and a driving component used for driving the scrapping plate to move back and forth. According to the dual waste scrap treatment device disclosed by the invention, by arranging the driving component, the scrapping plate is effectively driven to move back and forth in the rack housing, so that the inner wall of the rack housing can be effectively cleaned.

The invention discloses a speed sensorless control method of a permanent magnet synchronous motor, and belongs to the field of permanent magnet motors. A conventional assumption rotating coordinate method is adopted as a basis, on the basis of a model motor method, an estimation rotating speed is directly adopted as a control quantity through a sliding mode control method, then, a self-adaption law of the estimation rotating speed is obtained through a Lyapunov non-linear design method, an algorithm is greatly simplified, the system response speed is increased, meanwhile, forward and reverse rotation of the motor can be achieved, and the method can be used for the permanent magnet synchronous motor.

The invention discloses a filtering device for pharmaceutical equipment, and belongs to the technical field of pharmaceutical equipment. The filtering device comprises a shell for filtering medicines; and multiple vibration cleaning assemblies which are used for improving the cleaning effect of the filtering structure are installed in the shell. According to the invention, the screw stabilizing assembly is arranged inside, so the condition of motion eccentricity of the lifting screw caused by long-term work can be effectively avoided, and a good rotation effect of the threaded rotary drum matched with the screw stabilizing assembly is ensured; meanwhile, vibration can be effectively conducted into the vibration dredging shaft through the flexible vibration guide rubber, and the vibration dredging shaft can vibrate, so the design is ingenious; on one hand, the flexible vibration guide rubber can effectively reduce vibration of the stable sleeve and guarantee the using effect of the stable sleeve; on the other hand, vibration can be effectively utilized, the vibration dredging shaft of vibration can effectively dredge the interior of the feeding pipe, blockage in the feeding pipe is avoided, unavoidable invalid vibration can be utilized, waste is turned into wealth, and the use effect is improved.

The invention discloses a cable reciprocating twisting test device. The device comprises a frame, a transmission mechanism, a cable twisting disc, a rotating mechanism and a sliding mechanism, whereinthe transmission mechanism and the sliding mechanism both are arranged on the frame, the cable twisting disc is arranged under the transmission mechanism and connected with the transmission mechanismthrough the rotating mechanism, and reciprocating motion on the transmission mechanism can be realized through the transmission mechanism; and the sliding mechanism is arranged at one side of the transmission mechanism and can cooperate with the rotating mechanism to realize rotation of the cable twisting disc. The device provided by the invention has the characteristics of being rational in structure design, being capable of being dragged, moving in a reciprocating mode, twisting a cable in the reciprocating mode, and so on.

The invention discloses an electric side window of a locomotive. The electric side window comprises a side window outer frame, a mounting beam, a connecting crossbeam, a movable window, a supporting arm, a motor, a rotating wheel, an electromagnetic clutch and a circuit control unit. The side window outer frame is fixedly arranged on the side wall of the locomotive, the mounting beam is fixedly arranged at the lower end of the side window outer frame, the movable window is arranged in the side window outer frame in a lifting mode, and the connecting crossbeam is arranged at the bottom of the movable window; and the supporting arm is formed by sequentially hinging four arm body single parts in an end-to-end mode; the supporting arm is hinged to the connecting crossbeam through a first hinging point and hinged to the mounting beam through a third hinging point, the first hinging point and the third hinging point are connected through a first chain rope, and a second hinging point and a fourth hinging point are connected through a second chain rope. The supporting arm makes up-down movement by controlling forward and reverse rotation of the motor, and through air springs, it is ensured that force bearing of the movable window is balanced in the up-down movement process; and the electric side window has the advantages of being simple in structure, convenient to operate and good inreliability, and the using comfortableness of the whole locomotive can be improved by a large margin.

The invention discloses a lifting-type gas stove. The lifting-type gas stove comprises a panel, a bottom shell, a controller, a burner, a pulse igniter TQ, a fire-extinguishing probe BP, a furnace frame, a proportional solenoid valve KT, a gas inlet pipe, a round hole, a supporting frame, a baffle, a supporting plate and a driving mechanism, wherein the round hole is formed in the panel; the supporting frame is arranged at the bottom of the burner, used for supporting the burner and provided with teeth in the direction perpendicular to the panel; the baffle is arranged at the bottom of the panel and moves in the horizontal direction of the panel to achieve shielding and opening of the round hole; the supporting plate is fixed to the bottom of the panel; and the driving mechanism is fixedlyarranged on the supporting plate, used for driving the baffle to move in the horizontal direction of the panel and driving the supporting frame to move in the longitudinal direction, and achieves shielding protection of the burner and the furnace frame. The lifting-type gas stove has the advantages of simple structure, in-place protection, easy and convenient control and the like, and has wide market prospects in the technical field of the gas stoves.

The invention discloses a rapid clamping and casting mechanism applied to the field of casting. The rapid clamping and casting mechanism comprises a base, a mold with a casting port at the top is fixedly mounted on the base, a sleeve for placing the mold is rotatably mounted at the top of the base, a plurality of through grooves are formed in the outer side of the sleeve, sliding sleeves are rotatably mounted in the through grooves, first connecting rods slidably connected with the sliding sleeves are rotatably mounted at the top of the base, and the free ends of the multiple first connectingrods are rotatably connected with rollers tangent to the surface of the mold. According to the rapid clamping and casting mechanism, when the sleeve rotates clockwise, the first connecting rods are driven to rotate outwards relative to the mold, the mold is loosened and taken out conveniently, when the sleeve rotates anticlockwise, the first connecting rods are driven to rotate inwards relative tothe mold, the mold is clamped, the mold is fixed conveniently, meanwhile, automatic centering of the mold can be achieved, it is guaranteed that the central axis of the mold and the central axis of the sleeve are collinear, therefore, accurate communication between a casting funnel and the casting port is guaranteed, and molten iron splashing or overflowing during casting is avoided.

The invention relates to a poison-stirring device for killing not only rats, but also shrews. The device comprises a motor, a transmission belt, a reducer, a framework, a stirring box and a stirring shaft, and is characterized in that the stirring shaft is provided with stirring knives sequentially; the mounting angles of adjacent two stirring knives are different; the two ends of the stirring shaft are respectively supported by a framework bearing and a stirring box bearing. When the stirring device assembled according to the description is in use, only the motor needs to be started, and the transmission belt, the reducer and a shaft joint which are mutually connected can drive the stirring shaft and the stirring knives arranged thereon to rotate and stir. As the mounting angles of the adjacent stirring knives are different and the motor is a either-rotation motor, the stirring knives can rotate forward and backward to realize rapid and even stirring and ensure quality of stirring, thus achieving the purpose of the invention.

The invention discloses an agricultural mulching machine, comprising a mounting plate, two soil shoveling mechanisms are arranged at intervals at the front end of the mounting plate, two soil crushing devices are arranged on the mounting plate, and the rear end of the mounting plate is fixedly installed There is a reel, the axis of the reel is set parallel to the line connecting the two rollers at the rear end of the mounting plate, a film is wound on the reel, and the discharge end of the discharge pipe is arranged at a distance from the reel One end of the shoveling mechanism and the lower end of the discharge pipe are respectively arranged facing both sides of the film, and a spare soil storage box is arranged on the mounting plate, and two bottoms of the spare soil storage box are arranged Soil outlets, the soil outlets are respectively connected to the two crushing boxes through soil pipes, and the soil pipes are provided with a first valve. The invention has the advantages of being able to better cover crop seeds, high reliability, high degree of automation and good stability.

The invention belongs to the technical field of monitoring equipment, and in particular, discloses an automatic ash removing device for monitoring. The automatic ash removing device for monitoring comprises an ash removing shell; a cleaning mechanism and a dirt loosening mechanism are arranged in the ash removing shell; the cleaning mechanism comprises a first rotating shaft; the first rotating shaft is coaxially and fixedly connected with a ratchet; a cleaning scraper is bonded on the end surface of the ratchet; the ratchet is filled with a cleaning agent; the ratchet is provided with a cleaning agent outlet; a rope is fixed and wound on the first rotating shaft; a free end of the rope is connected with a gravity block; the dirt loosening mechanism comprises a second rotating shaft; the second rotating shaft is positioned above the first rotating shaft; the second rotating shaft is fixedly connected with a clamping jaw clamped with the ratchet; the ash removing shell is provided witha loosening driving mechanism for driving reciprocating rotation of the second rotating shaft; the second rotating shaft is fixedly connected with a swing rod; a swing hammer is fixed at a free end ofthe swing rod; and a gravity block return mechanism is arranged on the ash removing shell. The automatic ash removing device for monitoring can solve the problem of difficult cleaning of monitoring cameras.

The invention discloses an underwater detection spherical deformation robot which comprises a left side ball shell, a middle ball shell and a right side ball shell. A driving device is arranged in themiddle ball shell, and comprises a driving motor, two coaxial gear shafts on the left side and the right side, a battery and a first control device. The gear shafts on the left side and the right side are rotationally provided with the ball shells through bearings. The two gear shafts are in transmission connection with the driving motor. A high-pressure cylinder is installed in a sealed cavity.An inner cavity of the left side ball shell and an inner cavity of the right side ball shell are communicated with the high-pressure cylinder through air guide pipes respectively. The air guide pipesare provided with second control devices. Propellers installed on the gear shafts are arranged between the left and right side ball shells and the middle ball shell. Through the driving propelling ofthe propellers in cooperation with the control over the telescopic movements of the left side ball shell and the right side ball shell and the quantity flexibility of high-pressure gas, the steering movements of the robot are realized. The technical problem that people cannot directly participate in underwater experiments to obtain experiment data can be solved, and the underwater detection spherical deformation robot is a novel design scheme of underwater robots.

Disclosed is a scrap cleaning device of a numerically controlled lathe. The scrap cleaning device of the numerically controlled lathe comprises a main scrap removal mechanism and an auxiliary scrap removal mechanism. The main scrap removal mechanism comprises a conveyer belt and a scrap removal groove, wherein the conveyer belt conveys scraps out of the scrap cleaning device of the numerically controlled lathe, the scrap removal groove receives the scraps, and the conveyer belt serves as the groove bottom of the scrap removal groove. The auxiliary scrap removal mechanism is arranged above the scrap removal groove, and comprises scraping plates and a driving assembly, wherein the scraping plates are attached to a machine frame shell of the numerically controlled lathe, and the driving assembly drives the scraping plates to move back and forth. By the adoption of the scrap cleaning device of the numerically controlled lathe, due to the fact that the driving assembly is arranged, the scraping plates can be effectively driven to move back and forth in the machine frame shell, and the inner wall of the machine frame shell can be effectively cleaned.

A rotary device based on chain transmission and driven by a shape memory effect mainly comprises a driving component, a sprocket shaft component, a shell body component, a chain and the like, and achieves forward and reverse rotation through the shape memory effect of a shape memory polymer driving body in the driving component. The rotary device based on chain transmission and driven by the shape memory effect has the advantages of being simple in structure, easy to control, light in weight, resistant against abrasion, good in shock-absorption effect and the like. All the exposed parts are made of polymer, so that the rotary device based on chain transmission and driven by the shape memory effect can be applied to a high-corrosion environment with strong acid, strong alkali or the like.

The invention belongs to the technical field of the processing of bamboo chopsticks and discloses chopstick polishing equipment with a sorting function. The chopstick polishing equipment mainly comprises a stander, wherein the stander is provided with a polishing and sorting device, a polishing transmission mechanism and a sorting transmission mechanism; the polishing and sorting device comprises a polishing trough; a polishing curved plate which parallelly moves in a reciprocating manner along the length direction of the polishing trough under the drive of the polishing transmission mechanism is arranged at the bottom of the polishing trough; and the spacing distance between side plates at the two sides of the polishing trough corresponding to the long sides of the polishing curved plate gradually increases along with the reciprocating parallel motion of the polishing curved plate under the drive of the sorting transmission mechanism. According to the polishing equipment disclosed by the invention, a conveying mechanism is not required for being specially designed, so that the polishing equipment is very simple in structure and low in manufacturing cost. Furthermore, expendable polishing tools such as grinding wheels, abrasive belts and the like are not required for being used, thus the service cost is low. More importantly, the polishing equipment has a sorting function, so that the polishing equipment is convenient and practical.

The invention provides a cotton picking machine for spinning and relates to the technical field of cotton spinning. The cotton picking machine for spinning comprises a cotton loading disc, a central shaft is arranged at the center of the cotton loading disc, the top of the central shaft is sleeved with an inner ring of a rolling bearing, a cotton picking trolley is fixedly connected to the side face of an outer ring of the rolling bearing, a first power gear is fixedly connected to the top of an outer ring of a rolling gear, a first connecting block is fixedly connected to the top of a first rolling gear, a power device is fixedly connected to the side face of the first connecting block and meshed with a cleaning device, and a first reversing rod is arranged on the side, away from the power device, of the cleaning device and movably connected with the cotton picking trolley. A first fixing bearing and a second fixing bearing are used for clamping a worm wheel rod to the cotton pickingtrolley; when a plastic push block moves to push the first reversing rod or a second reversing rod, the first reversing rod or the second reversing rod pushes the worm wheel rod so that the worm wheelrod can be rotated backward and forward, and the plastic push block can reciprocate on a magnetic rod.

The invention discloses a graphite carbon rod cutting device. The graphite carbon rod cutting device comprises a first mounting plate, a second mounting plate, a first rolling shaft, a second rollingshaft and a cutting knife; supporting legs are fixedly welded to the four corners of the first mounting plate and the second mounting plate, a rotating shaft rod, the first rolling shaft and the second rolling shaft are arranged between the first mounting plate and the second mounting plate from left to right, a transmission belt is arranged on the first rolling shaft and the second rolling shaft,a second groove wheel is fixed to the end, where the rotating shaft rod turns, of the second mounting plate, a second fixed plate is fixed to the side edges of one set of supporting legs of the second mounting plate, a servo motor is arranged on the second fixed plate, a rotating wheel is arranged on the front end of a motor shaft of the servo motor, and a belt is connected between the rotating wheel and the second groove wheel. The graphite carbon rod cutting device is reasonable in design, and capable of effectively fixing a carbon bar, meanwhile, according to the size and the length of thecarbon, the cutting device is adjusted, and the device is suitable for use and popularization.

The invention relates to oil production equipment, in particular to a high-efficiency energy-saving type oil pumping unit which is composed of a bracket 8, a motor 1, a control box 2, a sprocket wheel 3, a chain 4, a tensioner 11, a steel wire rope 9, a pulley 10, a heavy punch 5, buffers 12, a guide rail 7, idler wheels 6 and a sensor 13, wherein the motor, the control box and the heavy punch are connected into a whole by using a steel frame structure; the idler wheels are respectively connected at two sides of the heavy punch and can vertically slide on the guide rail, so that a lifting system is formed; an intermittent mechanism is arranged in the control box; the sprocket wheel is in transmission connection with the motor; the chain passes through the heavy punch; the upper part of the chain is fixedly connected with a transverse beam of the bracket; the tensioner is arranged at the lower part of the chain, fixedly connected with a ground foundation and meshed with the sprocket wheel; the guide rail is fixedly connected with an upright post of the bracket; the pulley is fixedly connected with the transverse beam of the bracket; the lower end of the sensor is fixedly connected to the box cover of the control box; the upper end of the sensor is fixedly connected with the steel wire rope; the other end of the steel wire rope is connected with an underground sucker rod through the pulley; the plurality of buffers are respectively installed at the upper part and the lower part; the upper part is fixed on the transverse beam of the bracket; and the lower part is fixed on the ground foundation.

The invention discloses microbial feed heat-insulating fermentation equipment and belongs to the technical field of microbial feed preparation. The equipment comprises a fixing bottom plate, supporting frames are mounted on two sides of the upper end of the fixing bottom plate, a rotating barrel is mounted in the middle of the inner side of each supporting frame, a fermentation tank is mounted between the rotating barrels, a rotating shaft is connected in the middle of the upper end of the fixing bottom plate through a fixing support, a rotating gear is mounted in the middle of each of two ends of the rotating shaft, ring teeth arranged on the outer side of the fermentation tank are meshed at the upper end of each rotating gear, the right end of the rotating shaft penetrates the supportingframes to be connected with a driven gear, a driving gear is meshed at the right end of the driven gear, a driving shaft is mounted at the upper end of the driving gear, a crank is mounted in the middle of the upper end of the driving shaft, and an extensible rod is connected in the middle of the crank through a sliding sleeve. A microbial inoculant inside the fermentation tank can be mixed withbiological feed sufficiently, so that fermentation quality is improved, accumulation of the biological feed at the bottom of the fermentation tank is avoided, and fermentation effect is further improved.

The invention discloses a swing arm rotation type compressor which comprises a housing, a main shaft and an air guide pipe for communicating a two-stage compression chamber with an air inlet cavity or an air outlet cavity of a rotary valve, wherein the upper end surface of the housing is covered with an upper bearing sealing seat with a gland; an eccentric shaft section is formed in the middle of the main shaft; the inner circle of a rotary sleeve arranged in an inner cavity of the housing is connected with the eccentric shaft section of the main shaft through a sleeve bearing; the main shaft on the upper side and the lower side of the rotary sleeve is connected with the upper bearing seat and the housing through a pair of upper and lower rolling bearings; the rotary valve with the air inlet cavity and the air outlet cavity is arranged on the main shaft on the outer side of the upper bearing; the rotary valve is axially fixed by a locking nut through a valve plate and a gasket; an air inlet connector communicated with the air inlet cavity of the rotary valve and an air outlet connector communicated with the air outlet cavity of the rotary valve are arranged on the outer wall of the upper bearing seat; multiple sets of swing arm mechanisms contacted with the outer circle of the rotary sleeve are arranged along the inner circumferential direction of the housing; and the swing arm mechanisms, the housing, the rotary sleeve and the upper bearing seat form the two-stage compression chamber. According to the swing arm rotation type compressor, the functions of air suction, compression, air discharge and residual air expansion can be effectively achieved, multiple times of sequential compression operation can be finished by rotating the main shaft for a circle, the two-stage compression operation can be performed in each compression process, and the compressor is very small in frictional loss between moving parts, energy-saving, efficient and wide in application range.

The invention discloses a height adjustable device for a cabinet. A lifting device comprises a lifting frame, the inner side wall of the lifting frame is fixedly connected with a motor, the motor is fixedly connected with a connecting rod through a coupling, the other end of the connecting rod is rotatably connected to the side wall of a fixing plate, and the fixing plate is fixedly connected tothe inner side wall of the lifting frame. The device is provided with the lifting device and a control device, the lifting and lowering of the cabinet can be achieved by the cooperation of the liftingdevice and the control device, in the lifting device, the motor is a positive and negative rotation motor, the positive and negative rotation of the motor is achieved by the control device, thereby achieving the effect of lifting and lowering the cabinet, in the control device, the contact of a first contact piece, a second contact piece, a third contact piece and a fourth contact piece can be achieved by pushing and pulling a pressing plate, and the positive and negative rotation of the motor is achieved by controlling the switching on and off of two series connection circuits, thereby controlling the lifting and lowering of the cabinet.

The invention discloses an electromechanical commutator for an oil pumping unit, which comprises a front-row planet gear system and a rear-row planet gear system, wherein the two planet gear systems share one planet carrier; a rear brake disc is fixed on the planet carrier; the rear brake disc and a normally-closed rear electromagnetic disk brake form a brake device; a front brake disc is fixed on a front-row center wheel; the front brake disc and a normally-closed front electromagnetic disk brake form another brake device; an input shaft is fixedly connected with a front-row inner gear ring and a rear-row center wheel; the front-row center wheel and the planet carrier are idled with the input shaft; a rear-row inner gear ring is fixedly connected with an output shaft; the front-row planet gear is simultaneously meshed with the front-row center wheel and the front-row inner gear ring; and the rear-row planet gear is simultaneously meshed with the rear-row center wheel and the rear-row inner gear ring. According to the electromechanical commutator for the oil pumping unit, a series of problems brought by the fact that a reciprocating rotary oil pumping unit directly commutates by an electromotor can be solved, and therefore, the electromechanical commutator for the oil pumping unit has an important practical value.

The invention provides a hydraulic control system for a ditcher, and belongs to a mechanical hydraulic engineering device. The system comprises a hydraulic oil tank, a walking unit, a ditching unit, an excavation unit, a ditching adjustment unit and a heat dissipation unit. The system relates to a whole hydraulic control and driving scheme in the ditcher, and under the control of the scheme, the functions of independently controlling caterpillars on two sides of the ditcher, enabling a ditching device and an excavation device to work independently, flexibly adjusting the whole body angle and adjusting the ditching depth can be realized, thereby greatly enhancing the ditcher passing ability on one hand, and greatly enhancing the adaptability of the ditcher to the non-even pavements so as toimprove the ditching efficiency and ensure the ditching quality on the other hand.

The invention belongs to the related field of mask processing, and discloses a device for automatically detecting the quality of a nose bridge of a mask. The device comprises a bearing platform; a reciprocating sliding block cavity is formed in the bearing platform; a forward and reverse gear cavity located at the lower side of the interior of the bearing platform; a driving wheel cavity located at the lower side of the forward and reverse gear cavity in the bearing platform; a magnet moving cavity located on the lower side of the driving wheel cavity is formed in the bearing platform; a threaded shaft is driven to rotate in a threaded fit connection mode, so that the driving of a moving body is achieved; meanwhile, a spline shaft is used for achieving forward and reverse rotation of an output shaft, so that reciprocating motion of the driving body is achieved; the reciprocating sliding block is driven to slide through threads. the full-automatic reciprocating movement is realized through the interaction force between magnets, so that repeated automatic bending of the mask is achieved, and a detection effect is achieved, the detection efficiency is greatly improved, the detection automation degree is improved, and unnecessary manpower losses are reduced.