50results about How to "Realize mechanical self-locking" patented technology

The invention discloses a locking device for a scissor-type hydraulic lifting platform. A reducer (2) is connected with a screw rod (11) through a coupling (4); the middle part of the screw rod (11) passes through a connecting rod shaft (10) of a lifting support (13); a square locking nut (8) is sleeved on the screw rod (11) and is positioned on one side of the connecting rod shaft (10); the square locking nut (8) is arranged on a flat plate (7) which is fixed on a platform (15) of the lifting support (13) and is used for preventing the locking nut (8) from rotating and making the locking nut (8) axially linearly move under the driving of the screw rod (11); and one end of the screw rod (11) close to the reducer (2) is provided with a thrust bearing (6). The locking device realizes mechanical self-locking in a hydraulic lifting system, is particularly suitable for places with heavy load and requiring long-time locking, can effectively overcome the defect that a hydraulic element cannot realize long-time self-locking under heavy load in the prior art, protects the hydraulic element and guarantees simple, convenient, safe and reliable operation.

The invention belongs to the technical field of ships and relates to a hatch cover opening device which structurally comprises a hatch cover, an adjustable connecting rod, a driving rod and an oil cylinder. The driving rod is a triangle provided with three hinging points, one end of the hatch cover is hinged on a hull, the lower end of the oil cylinder is hinged on the hull, the upper end of the oil cylinder is connected with the first hinging point of the driving rod, the hatch cover is connected with the second hinging point of the driving rod, and the third hinging point is connected with the hull through the adjustable connecting rod and crosses a phantom line formed by the second hinging point and the hinging point of the adjustable rod and the hull to be in a self-locking position. Self-locking of the hatch cover on the hull in an opening state is realized through a mechanical self-lock, even if the oil cylinder is damaged, the mechanical self-lock can guarantee the hatch cover to be locked at the position, and the hatch cover opening device is simple in structure, convenient to use, safe and reliable; when the hatch cover needs to be closed, unlocking can be realized by directly drawing through the oil cylinder, automation is realized from locking of the hatch cover when opened in place to unlocking of the hatch cover when closed, and manual operations are not needed.

The invention relates to high-speed transfer switching equipment. The high-speed transfer switching equipment is mainly composed of a transfer mechanism part and a body part, wherein the transfer mechanism part is composed of a support assembly, an A power supply direction electromagnet assembly, an A auxiliary switch, a supporting piece, an A pressing plate, an A power supply square shaft assembly, an A swing arm, an A idler wheel, a middle connecting rod assembly, a B power supply square shaft assembly, a B pressing plate, a B swing arm, a B idler wheel, a circuit board assembly, a B auxiliary switch, a B power supply direction electromagnet assembly, a cam sliding block assembly, a right spring, a fixed base, a left spring, an A power supply electromagnetic assembly movable iron core and a B power supply electromagnetic assembly movable iron core, the body part is composed of a shell, an A power supply moving contact assembly, a static contact assembly, an arc-control device and a B power supply moving contact assembly, a transfer mechanism controls connection and disconnection of an A power supply moving contact and a B power supply moving contact by means of the double electromagnet assemblies which are arranged symmetrically, mechanical self-locking is achieved by means of the cam sliding block assembly, and the auxiliary switches are used for electric interlocking.

The invention relates to an energy-saving alternating-current contactor with a fault clearing lock. A lock hook is fixedly mounted on a moving iron core; the fault clearing lock is mounted below or above a static iron core; and the head of a lock tongue stem of the fault clearing lock is adjacent to a center line of the lock hook. A connecting rod on which a reset spring is sleeved is arranged ina lock body, the front end of the connecting rod is fixedly connected with a lock tongue stem baffle, and the rear end of the connecting rod is fixedly connected with an iron absorption plate; an unlocking coil and an iron core are mounted in a rear cavity of the lock body; and the unlocking coil is connected with an open-phase and short-circuit fault automatic clearing circuit. The invention hasthe characteristics that the mechanical self-locking of the three-phase moving contact can be realized, so that the coil of the contactor is uncharged during the normal operation to prolong the service life of the coil of the contactor and save the electric energy and the resources; when the faults of open phase and short circuit exist in an electric line, a switch is automatically closed to power off, so that the economic benefit and the social benefit are huge.

The invention discloses a parking device of an electric bicycle. The parking device comprises a mounting bottom plate, threaded rods, a driving mechanism, slide blocks and two sets of supporting mechanisms. The structure achieves automatic parking, relieves labor intensity, and increases parking efficiency; after parking is completed, the lower supporting ends of supporting rods in the two sets of supporting mechanisms and front and rear wheels of the electric bicycle form four-point support, moreover, the electric bicycle maintains a balanced state, lifting of the rear wheel in the supporting process is not needed, the parking process is stable and does not generate vibration, and therefore soup in a takeout with the soup is effectively prevented from being spattered; the supporting mechanisms achieve mechanical self-locking through the threaded rods, and the reliability of parking is high; under a parking state, the threaded rods, supporting arms and the supporting rods between the first slide block and the second slide block form triangular structures, and therefore the parking device has the characteristic of being high in parking stability; lifting of the supporting arms and the supporting rods is controlled through rotation of the threaded rods, amplification of vertical displacement is achieved, the structure of the parking device is small and exquisite, the occupied space is smaller, and the supporting arms and the supporting rods do not influence traveling after being retracted.

The invention discloses a metal wall surface self-adaptive climbing robot, which comprises a vehicle frame and a plurality of vehicle wheels arranged at the bottom of the vehicle frame. One or more vehicle wheel is provided with a driving device, at least two of the vehicle wheels at the bottom of the vehicle frame are mounted in pairs, one or more magnetic adsorption module is arranged between the two paired vehicle wheels, the magnetic adsorption module comprises an upper bracket, a lower bracket and a permanent magnet, the upper bracket is relatively and fixedly mounted at the bottom of thevehicle frame, the lower bracket is mounted at the bottom of the upper bracket by the rotational degree of freedom, the permanent magnet is fixedly mounted at the lower end of the lower bracket, thebottom height of the permanent magnet is lower than the bottom heights of the vehicle wheels, and the permanent magnet comprises a flat yoke iron located at the top and a plurality of rectangular neodymium iron boron permanent magnet arrays fixed to the bottom of the flat yoke iron. According to the metal wall surface self-adaptive climbing robot, the magnetic adsorption module with the axial degree of freedom greatly improves adaptability of robot climbing, the structure is simple, walking stability is good, and loading capacity is strong.

The invention discloses a rotary cash-out shutter, comprising a frame, a turnover shutter, a shutter actuator, a driving mechanism and a self-locking mechanism, wherein the turnover shutter is fixed on the shutter actuator; the driving mechanism is fixed on the frame and drives the shutter actuator to rotate; the driving mechanism comprises a driving motor, a driving shaft, a driving synchronous belt pulley, a driven synchronous belt pulley and a synchronous belt; the driving motor is fixed on the frame, two ends of the driving shaft are rotationally arranged on the frame, the driving synchronous belt pulley is fixed on an output shaft of the driving motor, the driven synchronous belt pulley is fixed on the driving shaft, and the synchronous belt encircles the driving synchronous belt pulley and the driven synchronous belt pulley; the bottom of the shutter actuator is fixed on the driving shaft; and the self-locking mechanism automatically locks the shutter actuator when the turnover shutter is closed. The rotary cash-out shutter is small in floor area, low in cost and high in reliability.

The invention relates to a friction brake for locking cylindrical parts by four stop blocks. The friction brake comprises such parts as a base, stop block parts, a slide way mechanism, a wedge block mechanism, a driving rod and a driven rod. The driving rod, the driven rod and the slide way mechanism form an altered crank slide block mechanism; a hydraulic motor drives the driving rod to rotate through a coupling; and the driven rod is enabled to push the slide way mechanism to move in the vertical direction so as to drive the stop blocks to move up and down. Meanwhile, the stop blocks respectively finish the actions of braking and releasing under the effects of a conical surface of the base and a wedged part under the wedge block mechanism. When the stop blocks lock a brake rod in a lowest point, a pressure angle on the driven rod is 90 degrees, and the slide way mechanism and the stop blocks are self-locked. The friction brake is compact in structure, smaller in weight and size and easy to arrange, can realize mechanical self-locking in the locking position, is high in braking reliability, can perform braking on whole cylindrical parts, is long in braking distance, and enables the axial braking performances of the cylindrical parts to become better.

The invention provides a self-locking type box overturning machine. A supporting frame, a rotating frame and conveyors are included. The self-locking type box overturning machine is characterized in that the rotating frame is arranged on the supporting frame, and symmetrically provided with the box entering and box outgoing conveyors; the conveying faces of the box entering and box outgoing conveyors are arranged in opposite directions; and the box outgoing conveyor is fixed to the rotating frame through a self-locking type synchronous lifting mechanism. After a box conveniently enters the box entering conveyor, the box outgoing conveyor is driven by the self-locking type synchronous lifting mechanism to stretch out so that the conveying face of the box outgoing conveyor can clamp the box; then along with rotation of the rotating frame, after the box entering and box outgoing conveyors and the box are overturned by 180 degrees, the box outgoing conveyor is driven by the self-locking type synchronous lifting mechanism to retract out so that clamping on the box can be released, and then the box overturned by 180 degrees is conveyed out through the box outgoing conveyor. The box overturning machine can be used for stably clamping the box, clamping and stretching and retracting are synchronous, mechanical self locking is achieved, it is guaranteed that the box keeps a consistent clamping force in the whole overturning process, the problem that due to the fact that clamping is not stable, after the box is loose, materials are scattered is solved, the structure is simple, clamping is reliable, and overturning is flexible.

The invention discloses a transport mechanical arm with a firm clamping function. The transport mechanical arm comprises a fixed framework, wherein a vertical section of the fixed framework is U-shaped; a groove is horizontally formed in the top end of the fixed framework; a first rodless cylinder that is horizontally arranged is mounted in the groove; an output shaft of the first rodless cylinderis connected to a movable framework; the movable framework sleeves the side wall of the top end of the fixed framework in a sliding manner; a telescopic column is connected to the bottom end of the movable framework; a first connecting rod that is obliquely arranged is welded on the side wall of the bottom end of the telescopic column; a second connecting rod is hinged to the bottom end of the first connecting rod; a single-head cylinder is hinged to the side wall of the first connecting rod; and a piston rod of the single-head cylinder is hinged to the second connecting rod. The transport mechanical arm with the firm clamping function can be adjusted in multiple positions, facilitates clamping and carrying, can be used for clamping a workpiece, has a good clamping and fixing effect, realizes mechanical self-locking, and ensures that a clamped object cannot get loose or drop off in case of a power or gas failure.

The invention relates to a door lock structure and a steaming cooking device provided with the same. The door lock structure comprises a first lock body arranged on a door body of the steaming cookingdevice and a cavity body, wherein an air guide port in fluid communication with an air outlet formed in an inner container of the steaming cooking device is formed in one end of the cavity body, a partition is arranged at the end of the cavity body by spacing, an air pressure cavity is formed between one side of the partition and the air guide port, air pressure on the other side is atmospheric pressure, a second lock body capable of being detachably connected with the first lock body is arranged on the side, furthermore, the partition can move back and forth along the cavity body under the action of pressure difference of two sides of the partition, therefore, the second lock body is enabled to move relative to the first lock body, and the two lock bodies are locked or unlocked. Comparedwith the prior art, the door lock structure can realize mechanical self-locking (namely, detachable connection of the first lock body and the second lock body) of the door body according to feedbackof steam pressure of the inner container, and prevents the door body from being opened by ejection and leaking air when the steam pressure of the inner container is overhigh.

The invention discloses a self-locking hydraulic cylinder. The cylinder comprises a cylinder body, wherein an upper end cover is fixedly arranged at the upper end of a cylinder body, and a lower end cover is fixedly arranged at the lower end of the cylinder body; a piston body is slidably connected in the cylinder body, a piston rod penetrating out of the upper end cover is arranged on the pistonbody, and the piston rod is in sliding connection with the upper end cover; a rod cavity is formed between the upper end cover and the piston body, and a rodless cavity is formed between the lower endcover and the piston body; and a port A communicating with the rod cavity and a port B communicating with the rodless cavity are formed in the side face of the cylinder body, a self-locking mechanismis arranged in the lower end cover, and when the self-locking mechanism can realize locking of the piston rod when the piston rod moves to any position. The self-locking hydraulic cylinder is simplein structure and capable of stopping and self-locking when the piston rod operates to any position.

The invention relates to a multi-jaw extracting tank and mainly solves the problem of poor sealing effect of an existing extracting tank. The multi-jaw extracting tank is characterized in that when a hook part of a rocker arm locks a sealing cover, a hinged center P1 of a triangular plate and a fixed hinged seat, a hinged center P2 of a connecting rod and the triangular plate and a hinged center P3 of the connecting rod and the rocker arm are on the same straight line. The multi-jaw extracting tank has the advantage that a dead point is formed so as to implement mechanical self-locking, thereby better locking the sealing cover and enabling the sealing effect to be better.

The invention relates to an energy-saving alternating-current contactor with a fault clearing lock. A lock hook is fixedly mounted on a moving iron core; the fault clearing lock is mounted below or above a static iron core; and the head of a lock tongue stem of the fault clearing lock is adjacent to a center line of the lock hook. A connecting rod on which a reset spring is sleeved is arranged in a lock body, the front end of the connecting rod is fixedly connected with a lock tongue stem baffle, and the rear end of the connecting rod is fixedly connected with an iron absorption plate; an unlocking coil and an iron core are mounted in a rear cavity of the lock body; and the unlocking coil is connected with an open-phase and short-circuit fault automatic clearing circuit. The invention has the characteristics that the mechanical self-locking of the three-phase moving contact can be realized, so that the coil of the contactor is uncharged during the normal operation to prolong the service life of the coil of the contactor and save the electric energy and the resources; when the faults of open phase and short circuit exist in an electric line, a switch is automatically closed to power off, so that the economic benefit and the social benefit are huge.

The invention discloses a dual-power conversion mechanism and a power supply power having the dual-power conversion mechanism. The dual-power conversion mechanism includes a common power switch including a first moving contact and a first static contact opposite to the first moving contact, a standby power switch includes a second moving contact and a second static contact opposite to the second moving contact, and a driving mechanism including a driving member which is connected with the first moving contact and the second moving contact and is driven to reciprocate, wherein the driving member has a power-off position capable of making the common power switch and the standby power switch achieve simultaneous power off, a first power-on position capable of making the common power switch powered on and the standby power switch powered off, and a second power-on position capable of making the standby power switch powered on and the common power switch powered off. The dual-power conversion mechanism is advantaged in that a problem of serious safety risks caused by the lack of a mechanical self-locking device between a common power and a standby power of a dual-power conversion mechanism in the prior art is solved.

The invention relates to sliding rail-type professional equipment used for going upstairs and downstairs and installed on a stair. The equipment consists of two sliding rails, a chain, a chain wheel,pulleys, a motor, a seat, connecting rods, a support frame and the like. As shown in figure: the lower part of the upper floor stair is provided with the two sliding rails; the chain is arranged between the two sliding rails; the pulleys slide in the sliding rails; the pulleys are fixed in a shell through the connecting rods; the motor is fixed to the exterior of the shell; the seat is suspended below the shell; and a person sits in the seat. The chain wheel is driven by the motor to rotate; the chain wheel moves in the direction of the chain to drive the pulleys to slide in the sliding rails;and the shell and the seat slide along the sliding rails together with the pulleys, and therefore, the function of going upstairs and downstairs is achieved.

The invention relates to a waist adjusting device for lying in nephrology department. The waist adjusting device comprises a bed body and supporting legs arranged at the bottom of the bed body, wherein every two adjacent supporting legs are connected through a cross beam; the bed body comprises a bed plate I and a bed plate II which are connected through folding mechanisms, and the bottom of the bed plate I is connected with the cross beam through an electric push rod; and each folding mechanism comprises a first fixing plate connected with the bed plate I, a second fixing plate connected withthe bed plate II and a joint cylinder arranged between the first fixing plate and the second fixing plate, flange plates penetrating through a main shaft are arranged at the two ends of the joint cylinder, the first fixing plate is arranged at the periphery of the main shaft in a sleeving manner through a rotating rod, and the second fixing plate is connected with the flange plates through a fixing rod. According to the waist adjusting device provided by the invention, the height of a sickbed of a patient is stably adjusted, and special nursing on the waist of the patient can be enhanced through a nursing pad.

The invention relates to high-speed transfer switching equipment. The high-speed transfer switching equipment is mainly composed of a transfer mechanism part and a body part, wherein the transfer mechanism part is composed of a support assembly, an A power supply direction electromagnet assembly, an A auxiliary switch, a supporting piece, an A pressing plate, an A power supply square shaft assembly, an A swing arm, an A idler wheel, a middle connecting rod assembly, a B power supply square shaft assembly, a B pressing plate, a B swing arm, a B idler wheel, a circuit board assembly, a B auxiliary switch, a B power supply direction electromagnet assembly, a cam sliding block assembly, a right spring, a fixed base, a left spring, an A power supply electromagnetic assembly movable iron core and a B power supply electromagnetic assembly movable iron core, the body part is composed of a shell, an A power supply moving contact assembly, a static contact assembly, an arc-control device and a B power supply moving contact assembly, a transfer mechanism controls connection and disconnection of an A power supply moving contact and a B power supply moving contact by means of the double electromagnet assemblies which are arranged symmetrically, mechanical self-locking is achieved by means of the cam sliding block assembly, and the auxiliary switches are used for electric interlocking.

The invention discloses a hydraulic automatic centering positioning clamping device which comprises a bottom plate, a driving mechanism, a centering positioning mechanism and a jacking mechanism, the driving mechanism comprises a hydraulic motor, an input shaft and a first bevel gear, and the two ends of the input shaft are coaxially and fixedly connected with the output end of the hydraulic motor and the first bevel gear correspondingly; the centering and positioning mechanism comprises a second bevel gear and two centering and positioning units, the second bevel gear is meshed with the first bevel gear, each centering and positioning unit comprises an output shaft, the output shafts of the two centering and positioning units are symmetrically arranged and coaxially fixed to the two sides of the second bevel gear, each output shaft is provided with a threaded section, and the threaded sections are connected with the second bevel gear. The thread directions of the thread sections on the two output shafts are opposite, the jacking mechanism comprises two jacking units, and each jacking unit comprises a push rod, a jacking rod and a guide seat. According to the device, hydraulic pressure serves as power, the hydraulic motor serves as an execution element, centering, positioning and clamping of a workpiece can be achieved, time and labor are saved, and automation of workpiece clamping can be achieved conveniently.

The invention provides an electronically controlled unloadable wheel retracting device, comprising a lower cross arm, a transmission short shaft, a torsion bar spring, a wheel retracting and retracting actuator, an electromagnetic unloading mechanism and a sliding spline sleeve; the lower cross arm and the transmission The stub shaft is fixedly connected; the transmission stub shaft and the torsion bar spring are coaxially arranged, and the two can be connected by a sliding spline sleeve; the wheel retractable actuator is arranged on the transmission stub shaft and is used as the sliding spline sleeve shaft When the sliding is disconnected from the torsion bar spring, and connected with the wheel retractable actuator, it drives the transmission short shaft, the suspension and the wheel to lift; the electromagnetic unloading mechanism is connected with the sliding spline sleeve to complete the sliding spline sleeve. Axial sliding of the key sleeve. The invention adopts the combination of an electromagnetic unloading mechanism and a wheel retracting actuator, which can quickly respond and completely remove the load exerted by the suspension elastic and damping elements on the wheel retracting device during the wheel retracting process.

The invention discloses a metal wall surface self-adaptive climbing robot, which comprises a vehicle frame and a plurality of vehicle wheels arranged at the bottom of the vehicle frame. One or more vehicle wheel is provided with a driving device, at least two of the vehicle wheels at the bottom of the vehicle frame are mounted in pairs, one or more magnetic adsorption module is arranged between the two paired vehicle wheels, the magnetic adsorption module comprises an upper bracket, a lower bracket and a permanent magnet, the upper bracket is relatively and fixedly mounted at the bottom of thevehicle frame, the lower bracket is mounted at the bottom of the upper bracket by the rotational degree of freedom, the permanent magnet is fixedly mounted at the lower end of the lower bracket, thebottom height of the permanent magnet is lower than the bottom heights of the vehicle wheels, and the permanent magnet comprises a flat yoke iron located at the top and a plurality of rectangular neodymium iron boron permanent magnet arrays fixed to the bottom of the flat yoke iron. According to the metal wall surface self-adaptive climbing robot, the magnetic adsorption module with the axial degree of freedom greatly improves adaptability of robot climbing, the structure is simple, walking stability is good, and loading capacity is strong.

The invention discloses a self-locking device. The self-locking device comprises a base used for being fixedly connected to an electric appliance, and two self-locking pieces arranged on one side of the base, wherein one end of each self-locking piece is fixed to the base, the other end of each self-locking piece is a free end, the two free ends are adjacent to each other, a V-shaped included angle is formed between the two self-locking pieces, and a fixing piece is inserted or pressed into the space between the two free ends to be locked to the electric appliance. The self-locking device has a high degree of fit with the fixing piece and is convenient to install, reliable in locking and capable of preventing the fixing piece from disengaging due to vibration in transportation; the fit clearance between the fixing piece and the self-locking device is small, it is not needed to use screws for fixing the fixing piece to the surface of the electric appliance any more, and the self-locking device can be shielded by the fixing piece when in use to beautify the appearance of the electric appliance; the self-locking device is simple in structure and simple in machining process, and thus the production cost can be easily reduced. The invention further discloses the fixing piece comprising the self-locking device. Locking of the fixing piece is reliable.

The invention discloses a mechanical self-locking device of a TKH series change-over switch, the mechanical self-locking device comprises a cylinder body and a piston rod, the upper and lower sides of the piston rod are respectively provided with two sliders which are connected by slider springs and are a distance apart, the upper and lower inner walls of the cylinder body are respectively provided with two static contacts corresponding between the two adjacent sliders, and the sum of the length of the slider spring compressed by the slider gravity, the length of the slider and the length of the static contact is greater than the distance between the cylinder body inner wall to the piston rod surface. The beneficial effects of the invention are that: mechanical self-locking and unlocking can be realized by friction; except the wind cylinder body and the piston rod, the change-over switch external dimension and other components may not be affected; under the condition of failures of a wind source and an electric pneumatic valve, the reliable operation of the TKH series change-over switch can be manually realized; and the normal operation reliability of the TKH series change-over switch can be improved.

The invention discloses a flying automobile wing contraction-release system, comprising a contraction-release guide mechanism, two contraction-release locking mechanisms and two skin anti-interferencemechanisms; the contraction-release guide mechanism is used for contracting, releasing and rotating wings; the two contraction-release locking mechanisms are used for ensuring safety and reliabilityfor the contraction and release of the wings; the two skin anti-interference mechanisms are used for ensuring completeness of pneumatic contours of the wings. The flying automobile wing contraction-release system is good in safety and reliability, simple in structure, low in manufacture cost and easy to use for civil and commercial purposes.

The invention discloses a self-locking type amplifying lifting mechanism. The mechanism comprises a bracket, a lifting machine and a base; the rear side of the bottom end of the bracket is hinged to the rear end of the base; the lifting machine is connected between the front end of the base and the front side of the bottom end of the bracket; the lifting machine comprises a reduction gearbox, twotriangular arms, two pull rods and a screw rod; the triangular arms are oppositely arranged at the bottom of the bracket, three hinge points are arranged at the three corners of each triangular arm, the hinge points I of the two triangular arms are hinged to the front side of the bottom end of the bracket correspondingly, and the hinge points II of the two triangular arms are connected with each other through a shaft; the reduction gearbox is hinged to the front end of the base, the reduction gearbox comprises a box body and a nut, the two ends of the nut are arranged in the box body through bearings, and a rotating mechanism for driving the nut to rotate is arranged on the box body; the screw rod is screwed in an internal thread of the nut of the reduction gearbox, and the rear end of thescrew rod is hinged to the shaft between the hinge points II of the two triangular arms through a connecting device; and the front ends of the pull rods are hinged to the front end of the base, and the rear ends of the pull rods are hinged to the hinge points III of the triangular arms correspondingly.

The invention discloses a flying automobile wing contraction-release system, comprising a contraction-release guide mechanism, two contraction-release locking mechanisms and two skin anti-interferencemechanisms; the contraction-release guide mechanism is used for contracting, releasing and rotating wings; the two contraction-release locking mechanisms are used for ensuring safety and reliabilityfor the contraction and release of the wings; the two skin anti-interference mechanisms are used for ensuring completeness of pneumatic contours of the wings. The flying automobile wing contraction-release system is good in safety and reliability, simple in structure, low in manufacture cost and easy to use for civil and commercial purposes.

The invention discloses a locking device. The locking device comprises a screw rod, and a door lock device is arranged on the screw rod; the door lock device comprises a locking block and a locking clamping groove, wherein the locking block is adjacent to a nut pair of the screw rod, and the locking clamping groove is formed in the screw rod; the locking block is screwed into the locking clampinggroove for axial locking under the rotation of one direction of the screw rod, and the locking block is screwed out of the locking clamping groove to carry out axial unlocking under the rotation of the other direction of the screw rod; the locking clamping groove comprises a step surface arranged on an polished shaft of the screw rod, and an arc-wedge-shaped clamping groove which is connected withthe step surface; and door lock supports which are rotationally connected with a sliding plug door are arranged outside the nut pair and the locking block. According to the locking device, the single-door drive system and the double-door drive, the automatic locking function and the unlocking function can be reliably completed; and in addition, the locking device further has the advantages of being few in parts, low in machining precision, simple in structure, and high in maintainability.

The invention belongs to the field of rail transit vehicle current collection devices and specifically relates to a lower contact automatic current collector. In order to solve problems of complicatedstructure, high fault rate, large size, incomplete functions, inconvenient maintenance and the like of the lower contact automatic current collector in the prior art, a technical scheme of the lowercontact automatic current collector is that the lower contact automatic current collector comprises a frame (1), an electric push rod (2), a carbon slide plate (6) and a rotating arm (4); one end of the rotating arm (4) is hinged to the frame (1); a tension spring (3) is also connected to the rotating arm (4); the other end of the tension spring (3) is connected with the frame (1); the electric push rod (2) is mounted on the frame (1); a push block (9) for pushing the rotating arm (4) to rotate around a rotating shaft (8) is connected to the electric push rod (2); and the carbon slide plate (6) is fixedly connected with the rotating arm (4) through an insulated swinging arm (5). The lower contact automatic current collector provided by the invention is suitable for the rail transit vehicleto dynamically collect current from a rigid power supply rail.

The invention relates to a door lock structure and a steaming cooking device provided with the same. The door lock structure comprises a first lock body arranged on a door body of the steaming cookingdevice and a cavity body, wherein an air guide port in fluid communication with an air outlet formed in an inner container of the steaming cooking device is formed in one end of the cavity body, a partition is arranged at the end of the cavity body by spacing, an air pressure cavity is formed between one side of the partition and the air guide port, air pressure on the other side is atmospheric pressure, a second lock body capable of being detachably connected with the first lock body is arranged on the side, furthermore, the partition can move back and forth along the cavity body under the action of pressure difference of two sides of the partition, therefore, the second lock body is enabled to move relative to the first lock body, and the two lock bodies are locked or unlocked. Comparedwith the prior art, the door lock structure can realize mechanical self-locking (namely, detachable connection of the first lock body and the second lock body) of the door body according to feedbackof steam pressure of the inner container, and prevents the door body from being opened by ejection and leaking air when the steam pressure of the inner container is overhigh.

The invention discloses a filter membrane clamping device with a self-locking damping function. A handle, a main rotary shaft and a crank are rigidly and integrally connected; the outer end part of the crank is connected with one end of a connecting rod through a crank rotary shaft, and a limiting groove is formed in the coinciding part of the crank and the connecting rod; the other end of the connecting rod is connected with a rocker rod through a connecting rod rotary shaft, and the connecting rod rotary shaft is fixedly arranged on the rocker rod; the rocker rod is connected with a fixing seat through a rocker rod rotary shaft, and the main rotary shaft is connected with a fixing seat through a bearing; the upper end and lower end of the spring are respectively connected with a spring upper hook and a spring lower hook of the fixing seat; the bottom part of a damper which is arranged on the fixing seat is in contact with the rocker rod; a filter membrane is in sealed connection with the rocker rod and the fixing seat respectively through a lower sealing ring and an upper sealing ring, and a limiting seat is arranged on the rocker rod; the fixing seat is in sealed connection with an air intake seat, and an air suction nozzle is matched with an air suction system. The filter membrane clamping device has the advantages that the mechanical self-locking function is realized, the clamping speed is high, the movement is stable, the damping effect is good, the movement and falling of the filter membrane are prevented, the whole structure is simple and compact, the cost is low, and the portability is good.