258results about How to "Realize overload protection" patented technology

The invention discloses a dual-axle resonance micro chemical accelerometer, which comprises a basic plate, a weigh block, suspend beams, a lever amplifying device, a sound fork, a driving electrode, a detecting electrode, a tooth axle and a backstop. Wherein, the weight block is circle whose middle part is mounted with a suspend beam, a lever amplifying device, a sound fork, a driving electrode, a detecting electrode, a tooth axle; the backstop is outside the weight block; the circle shape of weight block can make the element own larger weight block in limited volume; eight suspend beams form the flexible support to realize decouple in two orthogonal directions to improve the sensitivity and resolution in said two directions; the resonance beam has two ends to be fixed with sound forks, while two ends are connected to the outer element with narrow necks, to effectively reduce the energy couple between the resonance beam and outer structure; two symmetry sound forks can realize differential output of resonance frequency. The invention can improve the sensitivity, resolution and detecting accuracy of accelerometer.

The invention discloses a dual-axle capacitor micro mechanical accelerometer, which comprises a basic plate, a weigh block, a flexible support, a driving electrode, a detecting electrode, a tooth axle and a backstop, while it uses the weight block to sense the accelerators at two orthogonal directions. Wherein, the weight block is at the center of said device, while the flexible support, backstop, driving electrode, and detecting electrode are outside the weight block; the flexible support can realize decouple in two orthogonal directions to improve the sensitivity and resolution in said two directions; the flexible support uses the four corners of square as anchor points, with better structure stability; and it uses comb capacitor to realize differential static driving and capacitor detection, to improve the sensitivity and resolution of accelerator. The invention can easily realize two-dimension accelerator detection with high accuracy.

The invention comprises a pressure arm unit, a rotation shaft unit, a return spring, a push pedal, an internal friction plate, a brake, an external friction plate, a support and a caliper body arranged in order from right to left. Because of using the rectangular section torsional spring function, in a specific environment the invention can realize a one-way transmission of the torque and also can realize an overload protection effectively. The reasonable design of the pressure arm unit can supply the stable brake moment.

The invention provides a rotary hydraulic system and construction machinery. The rotary hydraulic system comprises a rotary motor, a brake oil cylinder, a main valve, a shuttle valve and a brake anti-lock valve. The brake anti-lock valve includes a first check valve and a hydraulic-control selector valve. An oil return port T of the main valve is communicated with a hydraulic control end Y of the hydraulic-control selector valve. An oil inlet port P is communicated with an oil return port of the first check valve and a port B of the hydraulic-control selector valve synchronously. A hydraulic control end X of the hydraulic-control selector valve is communicated with a port A of the shuttle valve. The port A of the shuttle valve and an oil outlet port of the first check valve are communicated with the brake oil cylinder synchronously. The main valve is communicated with the oil inlet port P and the oil return port T while a valve core is positioned at the center. When a rotary mechanism is rapidly stopped, the hydraulic-control selector valve is closed, the oil inlet port P of the main valve is communicated with the brake oil cylinder through the first check valve to prevent a brake from being closed, and accordingly, only if the rotary mechanism shakes, the brake is not locked, sense of impact is greatly reduced, and operational performance and operational comfort of rotary actions are further improved.

An electronic power-assisted steering system steering spindle, including input shaft 10, output shaft 11, torsion bar 12. Installation location and overload protection functions can be realized for torque rotation angle compound sensor 13. The moment torsion rotor 5 of torque rotation angle sensor 13 matches the input shaft 10 by key 14, the sensor position rotor 4 matches the output shaft 11 by key 15, and the fitting surface 16 of output shaft 11 and sensor 13 is knurl roll. Both ends of torsion bar 12 respectively interference fits with the input shaft 10 and the output shaft 11 hole. Angle of input shaft 10 between the tip plane6 and the tip plane 7 which fit the output shaft 11 is 168 degree, and the tip is the central symmetry shape. Output shaft 11 fits output shaft 10 are plane 8, plane 9.

The invention discloses an intelligent magnetic latching miniature circuit breaker, which comprises a shell, a magnetic latching relay and a driving circuit, wherein the driving circuit receives a control signal and then drives the magnetic latching relay to work; the magnetic latching relay comprises a movable spring assembly, a stationary spring assembly, a stirring rod, a pushing sheet and a magnetic steel assembly; the intelligent magnetic latching miniature circuit breaker also comprises a central processing unit, a communication chip and a measurement module; and the measurement module is used for measuring power, voltage and current data and sending the data to the central processing unit. The intelligent magnetic latching miniature circuit breaker has the advantages that: the conventional design idea for a miniature circuit breaker is eliminated; and by arranging the magnetic latching relay, the central processing unit, a current transformer, a measurement chip and the communication chip in a shell of the miniature circuit breaker, the miniature circuit breaker has protection, measurement, control and communication functions.

The invention belongs to the field of engine tests, discloses mechanical subsystems of in-situ calibrating systems, and relates to an in-situ calibrating device with a loaded direct-current torque motor and a loaded driving ball screw assembly. The in-situ calibrating device comprises the direct-current torque motor, the high-precision ball screw assembly, a high-precision encoder, a linear displacement sensor, a force transfer frame, a standard force sensor, a working force sensor, force transfer balls, force transfer ball sockets, a thrust frame, a force bearing frame, a motor base, a base, tapered roller bearings, a linear bearing, an electromagnetic clutch, double worm gear reducers, a hand wheel, an electric limit switch, a limit pressure plate and the like. The in-situ calibrating device has the advantages that an in-situ calibrating system comprises the in-situ calibrating device, a control subsystem of the in-situ calibrating system and a software subsystem of the in-situ calibrating system, an electric servo automatic control mechanical device loading method is implemented, accordingly, the in-situ calibrating device is high in in-situ calibrating loading force precision, is high in stability, good in safety and applicable to small-tonnage force and has an overload protection function, calibrating procedures can be automated, and manual loading modes are taken into consideration.

The invention discloses a fully-automatic back-flushing type self-cleaning filter. An inner cavity of a barrel body is divided into an upper cavity, a middle cavity and a lower cavity by an upper separating plate and a lower separating plate. In the middle cavity, two ends of a middle diversion pipe are respectively connected with big ladder center holes in the upper separating plate and the lower separating plate in sealed mode, and two ends of each of eight thin cylinder filter screens are respectively connected with eight small ladder holes in the upper separating plate and the lower separating plate in sealed mode. A middle blow-off pipe is sleeved in the middle diversion pipe in non-contact mode. An upper rotary arm is arranged in the upper cavity, and a lower rotary arm is arranged in the lower cavity. The upper rotary arm and the lower rotary arm are respectively composed of a four-way connector, two elbow pipes which are symmetrically connected with the left end and the right end of the four-way connector, and sealing covers connected with lower end faces of the elbow pipes. The upper end of the middle blow-off pipe is connected with the lower end of the four-way connector of the upper rotary arm, and the lower end of the middle blow-off pipe is connected with the upper end of the four-way connector of the lower rotary arm. The spacing between the two sealing covers on the same rotary arm is equal to the diameter of a circumference where the eight small ladder holes are located. The upper end of the four-way connector of the upper rotary arm is fixedly connected with a rotary arm drive shaft driven by a stepping motor. The thin cylinder filter screens are back-flushed automatically so that the back-flushing effect is good.

The invention relates to an automatic conversion device of an alternating current power supply, which belongs to the field of power electronics and aims to solve the problems that the requirement of power supply parameters of the power supply cannot be completely satisfied by the traditional converter, the output voltage stability is poor, and harmonic pollution to a power grid and magnetic pollution to an environment are easily caused due to potential safety hazard existing in manual operation of voltage ratio. The automatic conversion device comprises two stages of circuits, wherein the front stage is a Boost circuit having active power factor correction (APFC) function, the rear stage is a full-bridge inversion circuit, the full-bridge inversion circuit can be used for automatically switching output according to the grade of an input voltage, the Boost circuit can be used for boosting a wide-range alternating current into 400V direct current for output, and the full-bridge inversion circuit is used for automatically switching output voltage and frequency according to the input voltage. By the automatic conversion device, automatic switching of sine alternating current voltage between 220V / 50Hz and 110V / 60Hz can be achieved. The automatic conversion device is used for automatic switching of normal mains supply between 110V / 60Hz and 220V / 50Hz.

The invention relates to a mechanical arm tool mechanism, in particular to a mechanical arm tool mechanism used for nut assembling in a narrow space. The problems that during nut assembling in the narrow space, manual assembling is needed, the time and labor are consumed, working efficiency is low, and the assembling quality is difficult to guarantee are solved. The mechanical arm tool mechanism used for nut assembling in the narrow space comprises a motor, a supporting assembly, a lifting mechanism, a transmission mechanism, a posture control mechanism and an executing mechanism; the lifting mechanism is arranged at an entrance of the narrow space, the supporting assembly is arranged on the lifting mechanism and makes up-down reciprocating movement in the height direction of the lifting mechanism under control of the lifting mechanism, and the executing mechanism is hinged to the bottom of the supporting assembly; and the motor is arranged on the supporting assembly and connected with the executing mechanism through the transmission mechanism, the executing mechanism is driven by the posture control mechanism to make rotating action, and the executing mechanism is driven by the transmission mechanism to make nut assembling action. The mechanical arm tool mechanism used for nut assembling in the narrow space is used for assisting nut assembling in the narrow space.

The invention provides a totally-closed foreign material invasion prevention torque-limited permanent magnet coupler. The totally-closed foreign material invasion prevention torque-limited permanent magnet coupler comprises a conductor rotor assembly, a permanent magnet rotor assembly, an input shaft and an output shaft, wherein the conductor rotor assembly is connected with the input shaft, and the conductor rotor assembly comprises a magnetic conductor disc and a nonmagnetic metal disc which are coaxially arranged; the permanent magnet rotor assembly is connected to the output shaft, and the output shaft is used for carrying out circumferential limiting on the permanent magnet rotor assembly; the permanent magnet rotor assembly comprises a permanent magnet disc and a first axial limiting structure, and the first axial limiting structure is connected to the permanent magnet disc; the first axial limiting structure comprises a limiting sliding block, a clamping groove corresponding to the limiting sliding block is formed in the output shaft, and one end of the limiting sliding block slides into the clamping groove to carry out axial limiting on the permanent magnet rotor assembly or leave away from the clamping groove; the input shaft is used for driving the conductor rotor assembly to rotate, axial limiting between the permanent magnet disc and the magnetic conductor disc is carried out by a second limiting structure, the conductor rotor assembly is used for driving the permanent magnet rotor assembly to rotate through attracting magnetic force between the magnetic conductor disc and the permanent magnet disc, and the permanent magnet rotor assembly is used for driving the output shaft to rotate.

The invention relates to a pull-out guide (4) for drawers (3), comprising a body rail (5) to be fastened to a furniture body (2), a drawer rail (7) to be fastened to the drawer (3), and a center rail (6) movably mounted between the body rail (5) and the drawer rail (7), wherein the relative motion sequence of the rails (5, 6, 7) is determined by means of a forced control unit (10), wherein the forced control unit (10) has a synchronization wheel (9) designed as a gear wheel, which interacts with a running surface (5a, 5b) arranged or formed on the rails (5, 6, 7) and / or with a running surface (5a) of a carriage (12, 13), which is slidably mounted between the rails (5, 6, 7), wherein an overload protection mechanism (11) is provided, by means of which the forced control unit (10) of the rails (5, 6, 7) can be reversibly lifted.

The invention provides a locking device. The locking device comprises a first ratchet, a first pawl, a first rotating shaft and a fixed part, wherein the first rotating shaft is rotatably arranged on the fixed part; the first pawl is arranged on the first rotating shaft and can synchronously rotate along with the first rotating shaft; the first pawl is arranged on the fixed part; and the first pawl is matched with the first ratchet to lock the first rotating shaft. By utilizing the locking device, an auxiliary oil cylinder is guaranteed to stay at a position aligned to a joint of a hoisting arm after the hoisting of the hoisting arm is finished, so that the working efficiency of a demountable tanker carrier is improved, and the phenomenon that the oil cylinder is damaged because the oil cylinder naturally falls back is avoided. The invention also provides the demountable tanker carrier.

The hydraulic steel bar cutting machine includes machine base, cutter seat, hydraulic cylinder with piston rod, piston rod guiding seat, cutter fixed on the piston rod, sealing part between the piston rod and the hydraulic cylinder; motor driven oil pump connected via oil divider to the front cavity and the back cavity of the hydraulic cylinder, oil returning pipe connected between oil divider and oil tank; electromagnetic change-over valve with two electric magnets to control the front cavity and the back cavity separately; two stroke switches for limiting the range of the piston rod and corresponding touch blocks on the piston rod; and one circular control mechanism comprising the two stroke switches and the two electric magnets.

The invention discloses a full-hydraulic rotary cultivator with a triangular track wheel-type chassis. The rotary cultivator mainly comprises the triangular track chassis and a rotary cultivation device hung at the tail of the chassis, wherein the triangular track chassis is directly driven by symmetrically arranged hydraulic motors, two triangular tracks arranged on the same side transmit through chains, the rotary cultivation device is driven by the hydraulic motors through a gearbox, and the rotary cultivation depth is adjusted by a hydraulic cylinder. The rotary cultivation is capable of being adapted to various complicated operation terrains due to adoption of a hydraulic chassis driven by the triangular track chassis and turning by 360 degrees locally, flexible and convenient to steer in fields, driven by full hydraulic pressure, simple in structure, reliable in performance, provided with high practicability and suitable for being popularized and applied.

The invention discloses a default phase protecting method for a three-phase motor. The default phase protecting method comprises the following steps of: providing a weak current control loop on the basis of a main loop and a controller control loop of the three-phase motor; collecting line current and phase current of the three-phase motor by a current sampling device in the weak current control loop so as to obtain values of one group of line current Ic and phase current I1, line current Ib and phase current I3, or line current Ia and phase current I2; transmitting the values to a microcomputer which is connected with the current sampling device; and sending an instruction to control the ON / OFF of a relay KA1 by the microcomputer through calculation and analysis so as to realize the default phase protection of the three-phase motor. The default phase protecting method cannot be affected by the magnitude of current, has the characteristic of high response speed, and can be used for realizing the star-connection default-phase start protection and delta-connection default-phase operation protection of the three-phase motor.

The invention discloses a solar energy tracking device which is characterized by comprising a first base, a first hinged support, a primary beam , an secondary beam, a slide rail column, a second hinged support, a second base, inclined struts, a screw rod, a lead screw nut, a C-shaped slide block and a photovoltaic panel, wherein the secondary beam is welded on the primary beam; the photovoltaic panel is mounted on an upper plane of the secondary beam; the primary beam is hinged with the first hinged support and the C-shaped slide block through a T-shaped shaft; the C-shaped slide block in in clearance fit with an inner slideway of the slide rail column; the lead screw nut is fixed in the C-shaped slide block; the screw rod is screwed into the lead screw nut; two ends of the screw rod are mounted in the slide rail column through a slide bearing; a shaft and the inclined struts are welded at the lower part of the slide rail column; and the side rail column is hinged with the second hinged support through the shaft. According to the solar energy tracking device, the automatic tracking for solar azimuths and the manual tracking for slowly-changing solar azimuths are achieved at low cost.

The invention relates to an automatic turnover sick bed, which comprises bed support, motor, connecting rod, lead screw transmitter, friction wheel transmitter, sensor, control circuit, and electromagnetic clutch, wherein the operation panel of control circuit has lifting, lifting incline, bending leg control buttons; when the button is operated, the electromagnet of electromagnetic clutch is powered to absorb the bearing sheath magnet; the inner hole of bearing and the friction wheel step of friction wheel transmitter are fixed with clamping spring; the magnet moves to the electromagnet to slide the friction wheel on lead screw, to match the friction wheel, to provide positive pressure; then starting motor, the lead screw will rotate to move nut on lead screw; the transmitting nut will swing the connecting rod with connecting support; the connecting rod and the clamper form hinge to pushing bed. The invention can realize automatic operation.

The invention particularly relates to a crystal drawing device. The crystal drawing device comprises a crystal lifting mechanism, a lifting platform and a weighing sensor mounted on the lifting platform, and further comprises a crystal rotating mechanism and a weighing hanging basket which are both of axisymmetric structures; the weighing hanging basket comprises a hanging basket upper flat plate and a hanging basket connecting rod with one end connected with the hanging basket upper flat plate; the hanging basket upper flat plate is connected with the hanging basket connecting rod then to form an axisymmetric structure; the hanging basket upper flat plate is mounted on a weighing plane of the weighing sensor, and the other end of the hanging basket connecting rod penetrates downwards through a through hole on the lifting platform to be connected with the crystal rotating mechanism; the geometric symmetric axes of the weighing hanging basket and the crystal rotating mechanism are coaxially connected and fall on the weighing axis of the weighing sensor. In the crystal drawing device, the weight of the crystal rotating mechanism is borne by the weighing hanging basket, the weighing hanging basket and the crystal rotating mechanism are jointly connected to form a preload to act on the weighing sensor, the gravity of the preload falls on the weighing axis of the weighing sensor, thereby avoiding the influence of the load eccentricity on weighing results.

The invention discloses a mechanical soft starting auxiliary driving device. The mechanical soft starting auxiliary driving device comprises a prime motor, a mechanical soft starting device, a speed changing device, a working mechanism, a gate control system, a clutch, a second driving motor, a hydraulic pump, a second safe valve, a three-position four-way control valve, a controller, a power device, a combined reversing valve, an energy accumulator, a pressure sensor, a two-position two-way control valve and a first safe valve. When the working mechanism starts, the power device is in the hydraulic motor working condition to assist in starting of the working mechanism, and when the working mechanism brakes, the power device is in the pump working condition to assist in braking. By means of the mechanical soft starting auxiliary driving device, the effects of soft starting and soft stopping of common driving devices can be achieved, moreover, auxiliary braking and braking energy recycling can be achieved through an energy recycling device, the energy consumption of the working mechanism in the starting and stopping process is reduced, and the problem that the common existing driving devices cannot achieve energy saving effect basically is solved.

The invention relates to an elastic anti-drag deep soil loosing shovel. The elastic anti-drag deep soil loosing shovel comprises a U-shaped bolt, a connecting plate, a supporting arm, a deep soil loosing shovel handle and a deep soil loosing shovel, wherein the deep soil loosing shovel is arranged at the lower end of the deep soil loosing shovel handle; the front end of the supporting arm is fixedly connected with the connecting plate; the central part of the deep soil loosing shovel handle is hinged to the back end of the supporting arm; a mounting plate is arranged on the connecting plate, and a safety protecting device is arranged between the mounting plate and the upper end of the deep soil loosing shovel handle. The elastic anti-drag deep soil loosing shovel disclosed by the invention utilizes the safety protecting device to enable the deep soil loosing shovel to stride across a barrier when the deep soil loosing shovel meets with the barrier, so that the deep soil loosing shovel is effectively prevented from being deformed, and the reliability of a deep loosing operation is improved.

The invention discloses a step-type spring supporting vehicle axle load measurement device which is arranged on a pit and comprises an axle load weighing plate, spring weighing platforms, metal guideposts and guide frames; wherein the spring weighing platforms are symmetrically arranged at the four corners of the pit in a step form in a way of high inside and low outside and used for supporting the axle load weighing plate; the metal guide posts are square and evenly fixed in the pit; the guide frames are welded at the lower part of the axle load weighing plate, and each guide frame is formedby four guide frame units which are respectively arranged at the four sides of the metal guide post and matched therewith. The device can accurately measure the vehicle axle load, realizes overload protection of a sensor, and is simple in structure and low in manufacturing cost.

The invention discloses an intelligent energy-saving overload protection device of a crank press. A connecting rod ball head is restrained by an end cover, the ball head is mounted in a spherical support, the support is arranged in a cylinder body, the bottom of the support is connected with the upper end of a spring, and the lower end of the spring is fixed to the bottom in the cylinder body. A pressure sensor is located between the outer bottom of the cylinder body and an adjusting cushion plate and connected with a controller through a data line, and the adjusting cushion plate is located on a sliding block. Multiple permanent magnets are vertically arranged on the inner wall of the inner edge of the cylinder body annularly, and N poles and S poles of the adjacent permanent magnets arealternately arranged. The cylinder body is filled with magnetorheological fluid. A limiting end cover is fixed to the end cover of the cylinder body, and a travel switch connected with the controllerthrough a data line is mounted on the limiting end cover. An inner cavity of the cylinder body is divided into two parts through the spherical support, and the two parts communicate with each other through a throttling hole in the support. Magnetic pole polarity generated after a coil winding on the portion, on the inner side of the throttling hole, of the support is powered on are alternately arranged similar to the permanent magnets. The invention further discloses a protection method utilizing the device.

The invention belongs to the technical field of automobile parts, and particularly relates to a damper with overload protection and an electric tail gate support rod. An overload switching seat is arranged on the first side of a cavity of the damper so that the overload switching seat can rotate around a rotating shaft. An overload friction block is arranged on the first side of the overload switching seat by overload steel balls so that the overload switching seat can rotate around the rotating shaft and drive the overload friction block to rotate around the rotating shaft by the overload steel balls. A friction plate is arranged on the first side of the overload friction block. A fixed plate is arranged on the first side of the friction plate and is fixed in the cavity of the damper so that the fixed plate can not rotate around the rotating shaft. A flexible assembly is arranged on the first side of the fixed plate to pressurize on the fixed plate. According to the damper with overload protection and the electric tail gate support rod, the technical defect that an existing electric tail gate support rod does not have the overload protection function is effectively solved.

The invention discloses a safety monitor comprising a single chip microcomputer, a gravity sensor, three-phase input voltage and a relay, wherein the three-phase input voltage is accessed into the single chip microcomputer through a filter circuit; the gravity sensor is accessed into the single chip microcomputer through an amplification circuit and the filter circuit; and the single chip microcomputer controls the action of the relay. The single chip microcomputer is used for detecting whether the three-phase input voltage is lack of phase; and the safety monitor displays a failure cause when the three-phase input voltage is lack of phase. The safety monitor is used for managing and protecting a crane, adjusting the use of the crane and preventing the crane from operating when a potential hazard condition is probably caused. The safety monitor can realize overload protection on the crane, monitor the operation of the crane, failures, phase sequence of a main power supply, phase lacking of the main power supply as well as control the voltage, achieve low-speed starting and low-speed stopping functions, record operation time, and implement relay output and tonnage display.

The invention provides an elastic shaft coupler. A plurality of first positioning holes (5) are formed in one end face of a driving shaft disc (3); top pressing parts (6), first springs (7) and balls (8) are arranged in the first positioning holes (5); the pore diameter of an end face, located on the driving shaft disc (3), of each first positioning hole (5) is smaller than the diameter of each ball (8); each top pressing part (6) is used for tightly pressing each first spring (7) on the corresponding ball (8); one part of each ball (8) stretches out of the end face of the driving shaft disc (3) and is embedded into a corresponding second positioning hole (9) to fit the end face of the driving shaft disc (3) and the end face of a driven shaft disc (4); one end of each second spring (12) is pressed into a spring positioning hole (12) in a one to one correspondence and the end faces of the other ends of the second springs (12) are fitted with the end face of the inner side of a sleeve body (10). According to the elastic shaft coupler provided by the invention, torque transmission is carried out through the ball so that overload protection of a torque can be realized; the shaft coupler is internally provided with an elastic sheet and the springs so that stable transmission of the torque can be effectively guaranteed.

The invention discloses a miniature terrain-simulating automatic differential height power walking machine, which comprises a power device, a safety clutch device and a differential height executing device, wherein the safety clutch device and the differential height executing device are respectively connected with the power device. The machine is characterized by also comprising a terrain-simulating differential height control device, wherein the terrain-simulating differential height control device is respectively connected with an engine and the safety clutch device; the terrain-simulating differential height control device is connected with a connecting rod power shaft of the differential height executing device through a worm gear which is arranged in the terrain-simulating differential height control device, the power is inputted for a connecting rod swinging beam structure and a slide rod sleeve tube limiting mechanism of the differential height executing device, and then the differential height of driving wheels at the two sides of the machine is realized. The machine has the advantages that the structure is simple, and the operation is easy and convenient; the tilting degree of a vehicle body can be automatically identified according to the concave-convex conditions of operation grounds, such as mountains and hills, and the relative heights of the driving wheels at the two sides are adjusted, so the body of the walking machine is stable, and the easiness in side tilting is avoided.

The invention provides a convenient-speed-adjusting type screw oil press. A rack is mounted above the right end of a bottom plate, a base is arranged in the middle, the right side of the base is connected with a feeding nozzle, a hopper is fixedly mounted above the feeding nozzle, and a feeder and a motor assembly are mounted above the hopper. A press bar circular cage bar assembly is fixedly connected between the rack and the feeding nozzle, a press screw assembly is mounted in the rack, the press bar circular cage bar assembly and the base, the left side of the base is fixedly connected witha locomotive gearbox through a coupling, and the left end of the locomotive gearbox is connected with a V-belt pulley through a rotating shaft. The rotating speed can be adjusted to multiple gears, and the screw oil press is durable.

The invention relates to a motor and provides a motor with brake and overload protection. The brake has an overload protection function and can avoid that a rotating shaft is broken off due to impact. The motor comprises a motor body, a brake mechanism and a hydraulic overload protector, wherein the motor body comprises an inner rotor and a rotating shaft; the rotating shaft comprises a driving shaft and a driven shaft which are coaxial; the hydraulic overload protector comprises an installation rack, a crankshaft and a pair of hydraulic cylinders; a communicating tube is arranged between two cylinder bodies in the pair of hydraulic cylinders; a bidirectional pressure valve is arranged on the communicating tube; the crankshaft comprises a main shaft and a connecting rod shaft; the main shaft is connected with the installation rack in a rotating manner; the driven shaft is fixedly connected with the main shaft; the connecting rod shaft is connected with the installation rack by an oil cylinder; and one end of the driving shaft is fixedly connected with the inner rotor and the other end thereof is fixedly connected with the installation rack. The invention solves the problem that the rotating shaft is possibly broken off in a braking process and the problem of poor overload protection action timeliness and reliability.