1396results about How to "With self-locking function" patented technology

The invention discloses an automobile brake controlled by a wire, which comprises a brake disc, wherein a friction plate is arranged on each of the two sides of the brake disc; the friction plates are fixedly connected with a piston which can axially move along a brake caliper body and is connected with a trapezoid nut; the trapezoid nut can axially move along an inner hole of the piston and is in fit connection with a trapezoid threaded end of a screw rod; a driving nut is movably arranged on a ball screw section of the screw rod and is fixedly connected with a worm gear; the worm gear is engaged with a worm which is fixedly connected with an output end of a driving motor of the brake to covert the rotation motion of the driving motor of the brake into linear motion; and the driving motor of the brake is perpendicular to a brake caliper of the brake. The automobile brake controlled by the wire has automatic regulation and parking braking functions, can improve reinforcement effect, is high in braking performance, simple in structure, convenient to mount, easy to maintain and less in energy consumption, and can ensure the constancy of brake response speed of a vehicle so as to further ensure the braking performance.

The invention discloses a self-adaption absorptive clamping device of an airplane skin. The clamping device is characterized by comprising a frame, bent frames and self-adaption absorptive columns, wherein the upper and lower beams of the frame are provided with racks, and the two ends of each bent frame are arranged on the racks and can move along the racks; each bent frame is internally provided with a linear guide rail in a vertical direction, and each group of bent frames is provided with a certain amount of self-adaption adsorption columns and can move along the linear guide rail respectively; each adsorption column comprises a rotary vacuum chuck, a self-adaption telescopic link and a scale column. According to the clamping provided by the invention, the layout of the bent frames and the self-adaption absorptive columns can be adjusted by aiming at the shape of the skin, the absorption height can be adjusted by the scale columns and the self-adaption telescopic links, and the skin can be absorbed by the vacuum suckers; furthermore, the clamping device is applicable to clamping the skins of various shapes and sizes, the comprehensive cost can be reduced, the frock preparation period and production period can be shortened, and the production efficiency can be improved.

The invention relates to an underwater measuring platform, in particular to a gesture adjusting device for an underwater glider. Front and rear end covers of a roll support are arranged at two ends of a gesture adjusting pressure shell respectively. A front pitching baffle is arranged on the front end cover of the roll support rotatably. A rear pitching baffle is connected to a worm gear via a connecting frame. The worm gear is arranged on the rear end cover of the roll support rotatably. A roll motor is arranged on the rear end cover of the roll support. An output shaft of the roll motor is connected to a worm engaged with and driving the worm gear. A lead screw is arranged between the front and rear pitching baffles. One end of the lead screw is connected to a pitching motor arranged onthe connecting frame via a bevel gear group, and nuts are in thread connection with the lead screw. A battery pack and the nuts are connected as a whole. A guide rail is arranged between the front and rear pitching baffles, and a slide block connected with the battery pack as a whole is arranged on the guide rail. The gesture adjusting device provided by the invention has the advantages of simpleand compact structure, low power consumption, high reliability and wide adjusting range between a pitching angle and a roll angle.

The invention discloses a novel numerical control rolling taping machine which together finishes the taping process of the inner and outer plate flanges of a vehicle body covering piece through the triaxial linkage of a worktable and the shape following rotation of a rolling roller power head, comprises the basic principle and the detailed structure of a numerical control rolling machine tool and complementally explains the process characteristic and the basic process of the numerical control rolling machine tool. The invention aims at simplifying the taping process and the taping mould design of the flanges of the traditional vehicle body covering piece, improving the taping efficiency and lowering the taping cost. The machine tool only needs to carry out numerical control programming for different taping paths, can carry out taping for the inner and outer plates of various vehicle body covering pieces in multiple vehicle types without needing a special tool except for matching with a taping mould with a corresponding structure according to the shapes of different vehicle body covering pieces and can simultaneously finish a plurality of technical processes of loading and unloading, seal coating, taping, welding and the like by adopting one numerical control rolling machine tool, the automation of equipment and the flexibility degree of the taping process are improved, and the equipment can be very convenient to popularize and apply due to the universality of a numerical control system.

The invention relates to a tilted four-rotor aircraft. The tilted four-rotor aircraft comprises a fuselage, wherein the fuselage is provided with a front wing and a rear wing, two ends of the front wing and two ends of the rear wing are respectively provided with a set of rotor system, and the front wing and the rear wing are respectively and internally provided with a worm-wheel shaft which passes through the fuselage and is used for driving a rotor wing system to do tilted rotating motion; each set of rotor wing system comprises a direct-current brushless motor and a propeller, and the direct-current brushless motor is arranged at the end of the worm-wheel shaft and provided with the propeller. Compared with a conventional tilted double-rotor aircraft, the safety and reliability of the tilted four-rotor aircraft provided by the invention are higher; four rotors have strong lift force, so that the payload, flight radius and flight stability are all greatly improved. The tilted four-rotor aircraft provided by the invention can realize three flight modes, namely a helicopter mode, a transition mode and a horizontal propulsion mode, and has the characteristics of simple structure, high strength, reliable function realization and the like.

The invention relates to a cradle head, in particular to a two-degree-of-freedom cradle head mechanism. The aim of the invention is to provide a two-degree-of-freedom cradle head mechanism, which can transfer loads without being limited by motor loads. The two-degree-of-freedom cradle head mechanism comprise a base, a horizontal motor and a vertical motor, wherein the spindle of the vertical motor fixed below the base is coaxially jointed with a cable head seat capable of rotating horizontally above the base; a cable head is hinged above the cable head seat by two symmetric fulcra; the cable head has a reversed-U shape; the horizontal motor is fixed on one internal side wall; a pinion is arranged on the spindle B which penetreates the side wall of the cable head; the pinion is in meshed connection with a gear wheel fixed on the fulcra of the cable head seat; and the cable head is mainly used for fixing antennae and is an electrical cable head. In the mechanism, longitudinal load is applied onto the base with a smart structure, a motor shaft bears no axial forces, the structure is simplified and more compact, and the cost is reduced and the application range of the invention is enlarged.

The invention relates to a P step actuating mechanism of an electric control mechanical automatic variable-speed device for an electrically-operated car and a control system, comprising a P step position detection device of a gearshift handle, a P step electronic control device, a driving device, a position detection device of the driving device, a pawl and a ratchet wheel, wherein the P step electronic control device is electrically connected with the P step position detection device of the gearshift handle, the driving device and the position detection device of the driving device, the position detection device of the driving device and the driving device are arranged in a matching way for detecting the rotation position of a driving shaft of the driving device, the driving device, the pawl and the ratchet wheel are arranged in a matching way so as to drive the pawl to lock the ratchet wheel by the driving device, and the pawl is driven by the driving device or an elastic component to unlock the ratchet wheel. Preferably, the driving shaft drives the pawl by a transmission mechanism, and the P step electronic control device also is electrically connected with a car speed detection device. The invention has skillful design and convenient use, has very good braking effect for electric cars, increases the braking reliability of the electrically-operated cars greatly and is suitable for large-scale popularization and application.

The invention relates to a loading device for sphere precise grinding. The loading device comprises a motor, a worm and a gear, wherein the worm is connected with an output shaft of the motor; the gear is engaged with the worm. The gear is connected with an upper grinding disc through a press block. A first spring is arranged between the press block and the upper grinding disc. A second spring is arranged between the worm and the press block. The press block is provided with a piezoelectric sensor for detecting the suffered pressure of the second spring. The piezoelectric sensor is connected with a controller. A pressure threshold value is preset in the controller. The motor is controlled by the controller. The invention has the advantages of high grinding precision, simple structure, accurate control in the grinding process, and low cost.

The invention relates to a high-pressure gas circuit connector which consists of a plug and a socket, wherein the plug comprises a gas circuit jack, a housing and a nut. The gas circuit jack is provided with a through hole through which high-pressure gas passes; the socket comprises a gas circuit contact pin, a housing and a tail sleeve; the gas circuit contact pin is provided with a through holethrough which the high-pressure gas passes; the plug of the connector is provided with an unlocking sleeve and a locking spring simultaneously; a gland bush and a gasket are arranged in the gas circuit jack; the unlocking sleeve is arranged on the front end of the gas circuit jack; the locking spring is arranged in a cavity formed by the housing, the unlocking sleeve and the gas circuit jack; thesocket is provided with a release sleeve and a release spring simultaneously; the circumference of the side wall of the front end of the housing of the socket is provided with a plurality of holes, inwhich corresponding steel balls are arranged, and each hole mouth is provided with a position limiting structure; and the release sleeve and the release spring are arranged between the housing and the gas circuit contact pin. Due to the sealing performance and a rigidity connection structure, the invention has a self-locking function and can bear and transmit gas with quite high pressure.

The invention discloses a self-limiting electronic gear shifter. The gear shifter mainly comprises a pedestal, a housing, a gear shift lever, a cam seat and a gear shift switch, wherein the housing is arranged on the pedestal to form a chamber; the cam seat and the gear shift switch are arranged in the chamber; the gear shift switch is contacted and matched with the cam seat; the gear shift leveris connected with the cam seat; the housing is provided with a sliding chute which is matched with the gear shift lever; the gear shifter is characterized in that the gear shift lever mainly comprises an outer rod capable of being pressed down and a connecting rod arranged in the outer rod; a spring is arranged between the top of the connecting rod and the outer rod, and the other end of the connecting rod is connected with the cam seat; a circular arc groove is also formed in the chamber; the outer rod is also connected with a limiting body which is also arranged in the circular arc groove; and the circular arc groove is provided with a limiting groove which is matched with the limiting body along a corresponding part of each gear position. The self-limiting electronic gear shifter of the invention has a self-locking function, so that the operating safety of vehicles is ensured, and good handfeel is achieved during gear shifting.

The invention discloses a mechanical patient transferring trolley and belongs to the field of special patient transportation tools. The mechanical patient transferring trolley comprises an upper trolley frame, a middle trolley frame, a lower trolley frame, a lifting device arranged between the lower trolley frame and the middle trolley frame, an overturning device arranged between the middle trolley frame and the upper trolley frame, a horizontal moving device arranged on the upper trolley frame and multiple sliding carrying plates which are mutually isolated. A scissor jack is used for ascending and descending the upper trolley frame and the middle trolley frame. A screw nut pair is used for overturning the upper trolley frame. A horizontal guide rail and a rolling bearing are used for horizontally moving the sliding carrying plates which are used for flexibly transferring a patient. The mechanical patient transferring trolley is flexible and convenient to operate, small in number of nursing personnel, needless of greatly moving the patient and capable of avoiding secondary injury in the patient transferring process and has the advantages of being simple in structure, low in cost, convenient to maintain, stable in operation and low in noise.

A megawatt-level semi-direct driving wind generator comprises a wind wheel, a distance changer, a main axle, a speed accelerating box, a coupler, a generator, a cabin chassis, a bias motor and a control system. The chassis is fixed with the bias motor and the generator, the accelerating box is fixed with the side wall of the chassis, the accelerating box is first-stage planet accelerating gear box, and the motor is low-speed permanent magnetic three-phase synchronous generator. The invention can stabilize the transmission of transmitter, reduce impact, and reduce sealing demand or the like, with adjustable installed height, simple structure, high strength and accurate angle control on distance change as 0.1 degree, to output constant power.

The invention relates to a screw-nut gear-shifting mechanism for an automatic two-gear transmission of an electric car. The mechanism comprises an input shaft, an intermediate shaft and a fork gear-shifting mechanism, wherein the input shaft and the intermediate shaft are parallel to each other; a first-gear driving gear and a second-gear driving gear are fixedly arranged on the input shaft respectively; a second-gear driven gear, a first-gear driven gear, a main reduction driving gear and a synchronizer are sequentially arranged on the intermediate shaft respectively; the first-gear driving gear and the first-gear driven gear are normally engaged, and the second-gear driving gear and the second-gear driven gear are normally engaged; a main reduction driven gear is arranged to be matched with the main reduction driving gear, and during installation for usage, the main reduction driven gear is fixed on a differential mechanism flange plate through bolts; and a fork of the fork gear-shifting mechanism is sleeved with a joint sleeve of the synchronizer. According to the mechanism, a screw and screw-nut mechanism is adopted, so that the accuracy and the reliability of gear shifting are improved; and the mechanism is simple in structure, convenient to install and small in size, has a self-locking function and can prevent gears from loosening.

The invention belongs to the technical field of the flexibility actuator, and particularly relates to a changeable rigidity flexibility actuator. The actuator comprises a rack. A power input shaft with a square cross section is arranged on the rack, and a sliding sleeve with annular grooves is arranged on the power input shaft in a sliding mode. A power output shaft and the power input shaft are the coaxially arranged. The sliding sleeve is connected with the power output shaft through multiple extension springs. The input shaft can drive the sliding sleeve to rotate and drive the extension springs to twist, and then drive the power output shaft to rotate, so that the power flexible output is achieved. A lead screw parallel to the power input shaft is arranged on the rack. A shifting fork is connected with the lead screw in a threaded mode. Two extending arms of the shifting fork are arranged in the annular grooves of the sliding sleeve in an inserting mode. When the lead screw rotates, the sliding sleeve is driven by the shifting fork to slide along the power input shaft, so that the pre-load of the extension springs is changed, and the rigidity adjustment is achieved. The changeable rigidity flexibility actuator has the advantages of being simple in structure, rapid in adjustment, easy to control, and capable of being widely applied to various researches and applications such as bionics, service and rehabilitating robots.

The invention discloses a center-of-mass adjusting device of a deep sea glider. The center-of-mass adjusting device of the deep sea glider comprises a pitching adjusting portion, a transversely-rolling adjusting portion, a front baffle, a rear baffle, a front baffle supporting ring and a battery pack. The pitching adjusting portion comprises a first motor, a worm wheel, a worm, a ball screw and two linear guiding rails. The transversely-rolling adjusting portion comprises a second motor, a gear set and a gear ring. The battery pack comprises a battery pack body, a battery pack body installation support and an installation board. The front baffle and the rear baffle are respectively circular and are arranged at the two ends of the center-of-mass adjusting device in a concentric mode in parallel. The worm wheel is fixedly installed on the upper portion of the front baffle. The worm is fixedly connected with an output shaft of the first motor in a concentric mode and is meshed with the worm wheel, the first motor is parallel to the front baffle in the axial direction, the first motor is fixedly installed in the middle of the front baffle and located below the worm wheel, the second motor is provided with a worm and gear reduction gearbox, and the second motor is perpendicular to the front baffle in the axial direction. The center-of-mass adjusting device of the deep sea glider can solve the technical problems that an existing center-of-mass adjusting device of the deep sea glider is complex in structure and large in occupied space and only axial adjustment or circumferential adjustment can be achieved.

The invention relates to a wrist rehabilitation device which comprises a wrist front rehabilitation unit and a wrist rear rehabilitation unit, wherein the wrist front rehabilitation unit is fixedly connected with an arc-shaped rotating mechanism of the wrist rear rehabilitation unit by virtue of a connecting plate; the wrist front rehabilitation unit comprises an arm tray, an arm rear tray, a sector gear, an arm support frame and a connecting plate; the arm support frame is mounted on the connecting plate; a second motor is arranged between the arm support frame and the connecting plate; the output shaft of the second motor penetrates through the arm support frame and is connected with the arm rear tray by virtue of a connecting component; the sector gear is fixedly connected with the armrear tray by virtue of a key shaft; the arm tray is hinged with the arm rear tray; the arm tray is fixedly connected with a geared motor; the output shaft of the geared motor is fixedly connected witha pinion; the pinion is meshed with the sector gear. According to the wrist rehabilitation device disclosed by the invention, the wrist of a patient can be driven to make a three-degree-of-freedom motion, so that the patient can be subjected to effective rehabilitation training. The wrist rehabilitation device disclosed by the invention is small in size, light in weight and convenient to carry, and can be applied to multiple environments including home.

The invention discloses a two-stage spiral repeatable folding and unfolding locking mechanism of a solar wing. A two-stage spiral pair is utilized to transmit the rotation input by a power source so as to drive the left base plate and the right base plate of the solar wing to rotate, thereby realizing repeatable folding and unfolding of the solar wing. The self-locking function of the first-stage spiral pair is utilized to realize the locking of the final folding and unfolding positions of the solar wing, a ball locking position pin ensures the redundant and reliable position of the final folding and unfolding positions. The invention effectively utilizes joint space between the solar wing base plates, has compact and symmetrical structure, can realize high accuracy and high reliability movement easily, and can be applied to solar wings, space repeatable folding and unfolding mechanisms and ground repeatable unfolding mechanisms.

The invention provides an accurate controllable non-contact test piece rotary magnetic field fatigue excitation and vibration test device. The device comprises a vibration damping insulation clamp, a vibration damper, a dynamic balance device, a vibration exciter, an electromagnetic piezoelectric coupling vibration sensor, a test station, a transmission device and an accurate control device. The excitation and vibration test device is suitable for rotary test pieces and especially suitable for vibration characteristic researches on a wind power blade, an engine, a turbine blade, a helicopter rotor and a tail rotor blade, the excitation and vibration test device can vividly simulate vibration fatigue states of rotary test pieces respectively under conditions of 360-DEG all directions, same rotating speed and different excitation forces, same excitation force and different rotating speeds, and different rotating speeds and different excitation forces, the excitation and vibration test device can monitor related vibration characteristic parameters such as the excitation force, the vibration displacement, the vibration speed and the vibration acceleration continuously, and the excitation and vibration test device is suitable for vibration fatigue characteristic analysis on stationary test pieces.

The invention relates to a variable rate fertilization adjustment device and a control method of same. The adjustment device includes a fertilizer box, a machine frame, a fertilization executing apparatus, and an opening degree adjustment apparatus. The fertilization executing apparatus includes a plurality of fertilizer ejectors, an outer groove wheel, and a fertilizer ejection shaft. The fertilizer ejectors are disposed below the fertilizer box in an array and are linked to work, thus uniformly performing variable adjustment on fertilization quantity; the opening degree adjustment apparatus includes a speed reducing mechanism, a lead screw nut mechanism, a paddle mechanism, a stepping motor and a control system thereof. During operation, the stepping motor drives a lead screw to rotate with combination of the speed reducing mechanism, so that the paddle on the lead screw moves axially along the lead screw and triggers the fertilizer ejection shaft to move axially, thereby further changing opening degree of the outer groove wheel to adjust fertilizer ejection quantity. In the device, a planetary wheel speed reducing mechanism is added, so that torque is increased and load on the stepping motor is reduced, and so that accurate control on the axial movement of the fertilizer ejection shaft is achieved by means of rotation of the stepping motor, thereby increasing dynamic precision of the variable rate fertilization adjustment device.

The invention discloses a self-locking zipper head, which comprises a slide block body and a pull head trunk. The pull head trunk comprises a positioning part and a connecting part and is fixed on the slide block body through the connecting part. The self-locking zipper head also comprises a hook and an elastic sheet; a through hole is formed at a hooking part of the hook corresponding to an upper wing plate of the slide block body; the elastic sheet is used for elastically pressing the hook; two connecting columns are arranged on the upper wing plate of the slide block body; two ends of the elastic sheet are arranged on the connecting columns respectively; two limited blocks are arranged at two ends of the elastic sheet corresponding to the connecting part of the pull head trunk; the limited blocks are positioned above the two ends of the elastic sheet; the connecting columns and the two ends of the elastic sheet corresponding to the limiting blocks are provided with guiding structures; and the guiding structures make the two ends of the elastic sheet reciprocate between the connecting columns and the limited blocks. The self-locking zipper head has the advantage of convenience of manufacture.

The invention discloses a dodecagonal segment for shield tunnel construction. Two long bevel edges which are both splayed are arranged on the edges of the two transverse ends of the dodecagonal segment, a long transverse edge, a short bevel edge, an inwards-sunken transverse edge, a short bevel edge and a long transverse edge are sequentially formed from one end to the other end of the edge, with a greater transverse length, in the edges of the two longitudinal sides of the dodecagonal segment, a short transverse edge, a short bevel edge, an inwards-sunken transverse edge, a short bevel edge and a short transverse edge are sequentially formed from one end to the other end of the edge, with a smaller transverse length, in the edges of the two longitudinal sides of the dodecagonal segment. The invention also discloses a segment lining structure assembled by dodecagonal segments, and the adjacent dodecagonal segments are embedded and limited. According to the dodecagonal segment with a specific shape, the shape has a mounting guide function, so that the segment can be easily positioned; the dodecagonal segment lining structure can be continuously tunneled and spliced, so that the construction efficiency and the overall lining rigidity are remarkably improved.

The invention belongs to the technical field of the advanced manufacture and automation, and particularly relates to an all-terrain mobile robot. The all-terrain mobile robot comprises a wagon box body, leg structures and driving wheels; the leg structures have six sets and are respectively arranged in front of the wagon box body, in the middle of the wagon box body and behind the wagon box body and are symmetrically arranged at the left side and the right side of the wagon box body; the driving wheels have six sets and are respectively arranged at the tail ends of the leg structures; the transition flanges of the leg structures are bolted with the output flanges of a worm and gear reduction box arranged in the wagon box body; the switching flanges arranged in the middle of the driving wheels are bolted with a transmission shaft arranged at the tail end of the leg structure. As the all-terrain mobile robot is provided with six wheel-legs and the mobile mechanism of the all-terrain mobile robot is in wheeled model and is provided with legs which can rotate 360 degrees, the all-terrain mobile robot can move in a high speed, pass the ditch independently, surpass the threshold, climb the grade and the like in subdued topography.

A lifting trammer is characterized in that the invention comprises a base mechanism and an upper supporter mechanism, as well as a plurality of lifting locking mechanisms that is connected with the base mechanism and the upper supporter mechanism and a plurality of workpiece lifting locking locating mechanisms arranged on the upper supporter mechanism. The lifting trammer provided by the invention has the advantages of adjustable lifting height, firmness, large carrying ability, no loosening, no shaking and no librating in working time, convenient workpiece assembly and disassembly and self-lock function. A guide rail is arranged on the trammer so as to be convenient for the transportation of the workpiece and simultaneously lead the workpiece to carry out linear motion according to a regulated direction. The trammer is also provided with a locating device and can load the workpieces with different shapes and dimensions.

The present invention relates to a double-link overturning platform, which comprises an overturning platform top and an overturning system driving the overturning platform top, and wherein, the overturning system is composed of a platform top pitching mechanism and a platform top turning mechanism. The platform top pitching mechanism consists of a bench, two main motors, two decelerators, two couplings, two fixed seats, four fixed hinges, two small gears, two big gears, two big gear steady bearings, two lower link hinges, two links, two upper link hinges, a coordinating rod, a coordinating rod hinge, an overturning bench connecting seat, an overturning bench and two upper bench hinges. The platform top turning mechanism consists of a platform top rotating motor, a small platform top rotating gear, a large platform top rotating gear, a rotating platform top and a main shaft. The present invention utilizes the driving of the main motors and the platform top rotating motor to realize the overturning movement of a workpiece on the rotating platform top, the structure is simple, the platform top pitching mechanism has a force-increasing effect, the self-locking protection can be realized at an ultimate overturning position, and the present invention can realize the overturning of large-tonnage workpieces.

The invention discloses a lifting and transferring apparatus for paralytic patients and belongs to the field of medical nursing equipment. The lifting and transferring apparatus for paralytic patients comprises a framework, a cross beam, supports, a transverse moving mechanism, a longitudinal telescopic mechanism and a vertical elevating mechanism. The transferring apparatus can stably move along the length direction of a bed body via a gear rack mechanism and bearing guide rails; patient weight can be carried via a heavy-duty slide rail and the patient can move from the internal side of the bed body side surface toward the external side of the bed body; the patient can be lifted or put down via an electric capstan; transferring device structural stability and operation reliability can be improved; the transferring apparatus can be simply and conveniently operated; nursing workers are unnecessary for holding the patient up; and patient comfortableness is improved and labor intensity of the nursing workers is reduced.

The invention applies to a hardware electroplating passivation line of automobile parts in the electroplating industry, and particularly relates to a claw type manipulator device with stretching, retracting and rotating functions. The claw type manipulator device with the stretching, retracting and rotating functions comprises a cylinder and a bearing block, wherein the output end of the cylinder is connected with a rotating joint assembly, one end of each fourth connecting rod is connected with a second connecting rod through a corresponding third rotating joint, and the other end of the fourth connecting rod is in a claw type. The claw type manipulator device has the benefits as follows: independent in-out stretching and retracting of a spindle can be realized, the spindle can rotate under the premise that a drive does not rotate, equipment actions are diversified, the device adapts to production of more varieties of products, grabbing accuracy and grabbing firmness are guaranteed, a certain self-locking period can be kept under the premise of gas interruption or power outage of the drive, and other equipment is prevented from being damaged by falling of a stainless steel drum.

The invention provides a load overcurrent protection circuit. The load overcurrent protection circuit comprises a current sampling resistor, an amplifier, a comparator I, a timer, a self-locking control circuit and an electronic switch, wherein the current sampling resistor is connected with the electronic switch; the comparator I is connected with a reference source I; the amplifier amplifies the voltage of the current sampling resistor and transmits the voltage to the comparator I; the comparator I compares a voltage signal output by the amplifier with the reference source I; and the timer starts time delay timing if the voltage signal output by the amplifier is higher than the reference source I, the timer stops timing and the electronic switch normally switches on if the voltage signal output by the amplifier is lower than the reference source I in the time delay timing process, otherwise, the timer performs time delay timing to reach a set value, and the self-locking control circuit switches off the electronic switch and locks the off state of the electronic switch. The load overcurrent protection circuit solves the problems that the delayed time of overcurrent protection is short and an MOS tube is susceptible to burnout.

The invention relates to a hammer drill, which comprises a shell, a driving device arranged in the shell, a rotary output shaft driven by the driving device, a first impact component, a second impactcomponent and a switch for controlling impact frequency, wherein the first impact component and the second impact component are used for transmitting the specific impact frequency to the output shaft;the first impact component comprises a first static end gear and a first dynamic end gear which can impact and meshed; and the second impact component comprises a second static end gear and a seconddynamic end gear which can impact and meshed. The dynamic end and static end gears of the hammer drill can generate excellent contact while being meshed; and the static end gears have a self-locking function.

The invention provides a suspension device to overcome the defects of difficulty in self-locking of the existing 8-shaped ring type suspension device and certain potential safety hazards existing in use. A U-shaped rope threading piece is arranged on a suspension body, a U-shaped port of the U-shaped rope threading piece and the suspension body form a rope threading hole together, the suspension hole bearing the weight of a human body is arranged at a position deviating to one side, an operation handle controlling the deviation rotation of the suspension device is further arranged, a rope threading groove is arranged on the rope threading hole on the suspension body, the fixed end of a work rope is fixed at a high position while the free end of the work rope descends to a low position in use, and the human body is connected and fixed with the suspension hole; when the human body is born by the suspension hole independently, the fixed end of the work rope and free end of the work rope mutually press to stop work rope sliding, the human body is suspended at a high position, and the suspension device is a self-lock state; and when the human body applies a force on the suspension device by the operation handle, the suspension device deviates to reduce the pressure between the fixed end and the free end of the work rope so as to separate the fixed end and the free end of the work rope, then the work rope begins to slide and the human body descends.

The invention relates to an underwater verticality adjustment device of an acoustic Doppler current profile (ADCP) sensor, and belongs to the field of hydrologic monitoring. A worm and gear speed changing box is fixedly arranged on a fixed framework which is fixed on a prefabricated foundation, a sleeve of a rocker arm mechanism is in clearance fit with a worm-wheel shaft of the worm and gear speed changing box, a cross axle adjustment mechanism is installed on the fixed framework, the ADCP sensor is arranged on the cross axle adjustment mechanism and is fixedly connected with a linear bearing and a guide rod mechanism of the linear bearing, one end of a transmission mechanism 7 abuts against the sleeve of the rocker arm mechanism, the other end of the transmission mechanism is connected with the linear bearing and the guide rod mechanism of the linear bearing, and the worm and gear speed changing box and the rocker arm mechanism are provided with tensioning mechanisms. The device has the advantages of being small in size, light in weight, precise in positioning, and convenient to install, adjust and maintain, and the like; adjustment stability in the horizontal direction and the vertical direction is good; and compared with the prior art, the device is precise in positioning, can guarantee completeness and reliability of hydrologic data collection, has a self-lock function, and is simple and novel in structure, convenient to use, and strong in practicability.