1127 results about "Limit switch" patented technology

The utility model relates to the technical field of food processing, in particular to an automatic dough mixer which comprises a rack and further comprises a dough hopper, a stirring mechanism, a dough mixer, a dough mixer and a control system, one end of the flour hopper is connected with a worm gear which is meshed with a horizontal worm, and one end part of the worm is connected with a tipping bucket belt wheel; the switch baffle is fixedly mounted at the upper end of the side of the worm gear; the two limiting switches are installed on the machine frame and comprise the limiting switch a and the limiting switch b, the limiting switch a and the limiting switch b are located on the two sides of the switch blocking piece respectively, and when the switch blocking piece makes contact with the limiting switches, the noodle hopper stops overturning; the proximity switch catch is fixedly mounted at the lower end of the side of the worm gear; the two proximity switches are respectively a proximity switch a and a proximity switch b, the proximity switch a and the proximity switch b are fixed on the arc-shaped mounting plate, and after the proximity switch separation blade is in contact with the proximity switches, the noodle hopper stops overturning. According to the utility model, the overturning and aligning of the flour hopper can be accurately controlled.

The invention relates to the field of energy storage loop monitoring, and particularly discloses an innovative energy storage loop system for an operating mechanism of a medium-voltage switch cabinet, which realizes soft start and contactless control of an energy storage motor by introducing a dynamic motor control circuit. The multistage stroke detection device replaces a mechanical limit switch, provides real-time and continuous position monitoring for the energy storage mechanism, and thoroughly eliminates feedback lag and inaccuracy. The core energy storage state analysis unit can identify abnormal working conditions in the energy storage process in real time through intelligent acquisition, analysis and decision making of signals. Besides, the power supply unit provides a stable operation basis, and the bidirectional communication interface ensures information interaction between the system and the external environment, so that an intelligent energy storage ecological system with controllable closed loop, feedback of state and early warning of fault is jointly constructed, and the response speed and the operation stability of the medium-voltage switch cabinet operating mechanism are comprehensively improved.

According to the integrated gate position and limit acquisition method and device, linear motion of the gate is converted into rotation of the gears through the accurate transmission ratio between the gears, then tiny displacement changes are amplified or reduced, the sensitivity and accuracy of gate position monitoring are improved, and the problem that a traditional device is not high in precision is solved. The position of the gate is adjusted according to the height and actual requirements of the gate, a traditional gate level meter and a limiting switch are combined to form an integrated device, the transformation ratio gear, the PLC and the resistance strain type linear displacement sensor work cooperatively, all-directional and high-precision monitoring and control over the position of the gate are achieved, and the safety of the gate is improved. The integrated design not only reduces the size and complexity of the device, but also improves the stability and reliability of the device by optimizing the connection and communication among the parts, and in the aspect of installation, the integrated design enables the overall structure of the device to be more compact, and reduces the installation steps and required space.

The utility model relates to a limit protection device of a dry quenching elevator, which belongs to the technical field of coking dry quenching equipment and is used for protecting the limit of the dry quenching elevator. According to the technical scheme, a base is a rectangular plate, a fixing support is perpendicularly welded to the plate face of the base, an adjusting movable plate is connected with the fixing support through an adjusting fastening bolt, a limiting fixing plate is perpendicularly welded to the front end of the adjusting movable plate, and a U-shaped limiting plate is fixed to the plate face of the limiting fixing plate through a limiting fixing bolt; the two upper limiting guide plates and the two lower limiting guide plates are located on the two sides of the U-shaped limiting device respectively and are perpendicularly connected with the plate face of the limiting fixing plate in a welded mode respectively, and the upper limiting guide plates and the lower limiting guide plates on the two sides of the U-shaped limiting device respectively form two V-shaped guide grooves. The elevator limiting device is simple in structure and reliable in work, the elevator can be protected from being damaged due to the fact that the elevator is scratched by the running elevator, safety and equipment hidden dangers are effectively eliminated, and normal running of the elevator is guaranteed.

The utility model belongs to the technical field of construction safety ropes, and particularly relates to a safety rope fixing structure for building construction, which comprises an anti-falling fixing box, a locking structure for fixing a safety rope is arranged in the anti-falling fixing box in a limiting and sliding manner, and a fixing and locking table is mounted on one side of the locking structure. The other side of the locking structure is in driving connection with a movable locking table sliding on the locking structure through an electric telescopic rod, and the bottom of the locking structure is connected with a clamping convex block and a clamping concave block through telescopic springs. The locking structure moves downwards along the limiting guide rod under the pulling force of the safety rope, the electric telescopic rod is started through the contact type stroke limiting switch to drive the movable locking table to be matched with the fixed locking table, the safety rope is seized through the locking block and cannot slip off, and then the locking protection effect on the safety rope is achieved; and meanwhile, the clamping convex block and the clamping concave block slide downwards along the inclined guide sliding table and are mutually extruded and close to each other, the safety rope is firmly locked through the clamping convex strip, and the safety guarantee capacity of constructors is improved.

The invention discloses an intelligent material cabinet and a safe and accurate material distribution method. The intelligent material cabinet further comprises an anti-theft unit, a material recognition unit and a safety interlocking mechanism on the basis of a conventional cabinet body. The anti-theft unit seals a blue opening by arranging a long turning plate and a short turning plate at the blue opening of a lifting blue and is linked with a material taking turning plate of a material taking opening; the material identification unit is provided with an intelligent camera, a wide-angle camera and a pressure sensor for detecting material information; the safety interlocking mechanism is provided with a limiting switch, an electronic bolt door lock and a material taking indicator lamp, and limiting of the lifting basket, locking of a material taking opening material taking turning plate and material taking prompting are achieved. According to the method, safe and accurate material distribution is achieved through material management, material identification and safety linkage. According to the material cabinet and the method, the defects of traditional material warehouse management are overcome, the accuracy of material distribution and the anomaly detection processing capacity are improved, the vulnerability of theft is eradicated, the safety of material extraction operation is ensured, and then the adaptability, automation and intelligence of material warehouse management are improved.

The invention provides a cam limiting external fixing spiral clutch device for lifting opening and closing of a grab ship unloader, and relates to the technical field of bulk cargo wharf grab ship unloaders, which comprises a pinion in clearance fit with a planetary reducer shaft, a bull gear connected with a cam limiting switch through a bolt, and an adjusting bolt in threaded fit with a shaft hole at the end part of the pinion. A shaft shoulder unthreaded hole is formed in the center of the planetary reducer shaft to limit axial movement of the adjusting bolt. The small gear is driven to slide in the axial direction by twisting the adjusting bolt so as to be meshed with or separated from the large gear, the adjusting bolt is reversely rotated before rope replacement to enable the gear to be separated, the large gear is prevented from being driven by rotation of the small gear, and therefore the cam limiting switch shaft is fixed; after the rope is replaced, the gears are meshed through reverse rotation again, and connection is recovered. The device is simple in structure, realizes fixation and reconnection of the limit switch shaft through mechanical transmission, does not need manual disassembly, assembly and debugging, saves manpower and time cost, is low in failure rate, and is suitable for the scene of replacing the steel wire rope of the four-drum grab ship unloader.

The invention provides a cam limiting internal fixing spiral clutch device for lifting opening and closing of a grab ship unloader, which relates to the technical field of bulk cargo wharf grab ship unloaders and comprises a pinion in clearance fit with a planetary reducer shaft, a cam limiting switch in bolted connection with a bull gear and an adjusting bolt. An end shaft hole of the pinion is provided with internal threads, a threaded hole is formed in the center of a planetary reducer shaft, and the adjusting bolt is matched with the threaded hole; the small gear is driven to slide in the axial direction to be engaged with or disengaged from the large gear by rotating the bolt cap. When the steel wire rope is replaced, the disengagement gear can avoid contact deviation caused by rotation of the cam limit switch shaft; the gear is directly meshed after the rope is replaced, and secondary contact adjustment is not needed. The structure of the device adopts a pure mechanical mode, operation is simplified, stability is high, and debugging time of about one day is saved for single maintenance.

An aperture assembly for use with a subsurface ejection vessel includes an electromagnet, a first dynamic aperture, a second dynamic aperture, a hollow shaft injection drill bit, a third dynamic aperture, collar perforations, and closed window apertures. The electromagnet actuates a closing of the first dynamic aperture. The electromagnet actuates an opening of the second dynamic aperture. The third dynamic aperture dynamically opens when triggered by a first pre-determined depth achievement counting by the encoder of the lead screw or distance traveled by a platform (505A) triggered by the limit switch that are communicated to the AI robot, the computer, and the PLC. The third dynamic aperture dynamically opens when the camera lens has a second pre-determined depth penetration of the hollow shaft injection drill bit and that the limit switch information is communicated to the computer, or the PLC.

The invention provides a tool applied to the field of petroleum drilling, and particularly relates to an electric control intelligent coring drill bit which comprises a power module and a cutting module, a limiting switch is arranged in the cutting module, the drill bit normally drills, a rock core passes through the interior of the drill bit and enters a coring barrel, and when the top of the rock core in the coring barrel triggers the limiting switch, the limiting switch is switched on. The MCU receives a coring completion signal, the electromagnetic valve is controlled to be opened through the MCU, high-pressure drilling fluid enters a turbine cavity through a mandrel hole, under the action of the high-pressure drilling fluid, the turbine rotates to generate motion and power, the motion and the power are transmitted to the rotating ring through the rotating disc and the rotating sleeve, the rotating ring rotates to push the connecting rod, the connecting rod pushes the evenly-distributed cutting knives, and therefore coring is completed. And the uniformly distributed cutting knives and the coring cylinder form a sealing cavity, the cut rock core is placed in the sealing cavity, and the cut rock core is taken out after pulling out of the drill. The intelligent degree of the drilling coring bit can be effectively improved, and the drilling coring efficiency and success rate are effectively improved.

The invention discloses a rapid cooling and dust removing system and method for a metal smelting crucible. The system comprises a cooling and dust removing device, a dust remover, an air compressor, a water pump, a limiting switch, a time relay and a controller. An air outlet of the air compressor is respectively communicated with an air inlet of the air blowing pipe and an air inlet of the water spraying pipe of the cooling dust removal device through hoses; a water outlet of the water pump communicates with a water inlet of the spray pipe through a hose; and a limiting switch is arranged on a sealing furnace cover of the smelting furnace. The method comprises the following steps: (1) moving the cooling dust removal device in place; and (2) cooling and dedusting. The rapid cooling and dust removal system for the metal smelting crucible has the beneficial effects that the automatic cooling and dust removal functions on the smelting crucible are achieved, the cooling rate and the dust removal effect on the crucible are improved, and the field environment is protected; the invention discloses a rapid cooling and dust removing method for a metal smelting crucible. The method is high in automation degree, manual intervention and operation errors are reduced, the cooling speed is remarkably increased, and the crucible cooling period is shortened. The pollution of dust to workshop air is greatly reduced, the health of operators is protected, and meanwhile, the adhesion abrasion of dust to equipment is reduced.

The utility model discloses an elevator limit switch distance and buffer distance automatic testing device which comprises a traction machine (10) which is arranged at the upper end of an elevator shaft and provided with an encoder, a traction wheel (1) is arranged on the traction machine (10), a guide wheel (2) is arranged on one side of the traction wheel (1), a traction rope (3) is arranged on the traction wheel (1) and the guide wheel (2), and the traction rope (3) is connected with the traction machine (10). An elevator car (4) and an elevator counterweight (5) are arranged at the two ends of the traction rope (3) respectively, a car buffer (6) corresponding to the elevator car (4) and a counterweight buffer (7) corresponding to the elevator counterweight (5) are arranged at the lower end of the elevator shaft, a limit switch (8) is arranged on one side of the elevator car (4), and a collision bow (9) corresponding to the limit switch (8) is arranged on the upper side and the lower side of the side wall of the shaft. The device can be used for automatically testing the distance, and is accurate in detection and low in cost.

The invention relates to the technical field of insulator maintenance, and particularly discloses a 500kV power transmission line tension-resistant single insulator maintenance labor-saving support which comprises a limit switch. The limiting switches are used for adjusting the distance between the fixing elements; the two groups of fixing elements are connected through the connecting element; wherein the fixing element is designed to be of an annular structure and is provided with four supporting legs, the inclined supporting legs are fixed to the side wall of the insulator, and the connecting element and the insulator are kept parallel to each other. The requirement that operators need to manually carry heavy insulators is greatly reduced, the distance between the fixing elements can be automatically adjusted according to the specific size of the insulators, stable installation is achieved by means of the flexible contact face provided by the air bag, and operation can be smoothly conducted even in the narrow or difficult-to-approach position.

The utility model relates to a mechanical holding relay, which comprises a relay base and an upper cover in buckling connection, a driving motor is arranged in the relay base, and the driving motor is connected with at least two movable contact plates rotating around a shaft through a gear transmission mechanism. One end of the movable contact plate is connected with a conductive sheet arranged on the relay base through a flexible conductive piece, the other end of the movable contact plate is provided with a movable contact, the relay base is also provided with a static sheet, the static sheet is provided with a static contact, and the movable contact is in contact with or separated from the static contact; the beneficial effects are that 1, the driving motor drives the movable contact plate to rotate positively and negatively through the gear transmission mechanism to realize opening and closing of the switch; 2, two stroke limit switches are arranged on the circuit board to control the opening and closing positions, and the control switch can automatically cut off the power supply of the motor after the opening and closing are in place, so that the over-stroke action is avoided;

A safe and reliable trolley relates to the technical field of cranes and comprises a trolley frame, a duplex winding drum, a lifting hook and a balance mechanism, a balance mechanism for fixing a steel wire rope is arranged on the other side of the top of the trolley frame; arc-shaped dragging pads and first limiting switches for detecting broken shafts are arranged at the bottoms of the two ends, corresponding to the duplex winding drum, of the trolley frame; safety reverse hooks capable of being clamped with corresponding track beams are arranged on the two sides of the bottom of the trolley frame; a lifting hook is arranged below the trolley frame; the top of the lifting hook is rotationally connected with a movable pulley block; the two steel wire ropes are wound around the two ends of the duplex winding drum respectively and correspondingly connected with the balance mechanism after being wound around the movable pulley block. When a shaft is broken, the corresponding end of the duplex winding drum falls on the arc-shaped dragging pad and is locked by the arc-shaped dragging pad, and meanwhile, the first limiting switch is triggered to send a shutdown signal, so that the situation that the driving device continuously drives the duplex winding drum to rotate, and the duplex winding drum rolls off from the trolley frame is prevented.

The invention provides a dust removal cover, and relates to the technical field of scrap steel cutting dust removal. According to the dust removal cover, first limiting switches at SQ2-SQ7 positions are sequentially matched with first collision rods, so that an automatic walking assembly can be sequentially and accurately stopped in three corresponding fixed-point cutting areas; meanwhile, when the suction hood stops at the position, a second collision rod can just enable a heavy hammer rod of the heavy hammer flap valve to move to the highest position so as to automatically open a valve plate, and then the suction hood is communicated with the public flue to be matched with an induced draft fan and a dust remover, so that flame cutting and efficient dust removal can be performed on a local area of a scrap steel stacking and cutting area; in addition, two first limiting switches at the positions of SQ1 and SQ8 can be matched with a first sinker bar to limit the extreme movement positions of the two sides of the suction cover, the triggering directions of the first limiting switches at the positions of SQ1, SQ2, SQ4 and SQ6 are opposite to the triggering directions of the first limiting switches at the positions of SQ3, SQ5, SQ7 and SQ8, and then the suction cover does reciprocating motion to return to the stop position again for steel slag discharging.

The invention belongs to the technical field of special maintenance in a high-radiation environment of a nuclear power plant, and particularly relates to a digital control system and method for high-radiation boron-containing underwater electrical discharge machining. Comprising a control module, the control module is respectively connected with a human-computer interaction interface, an input / output module, an analog-to-digital conversion module and field layer equipment, the input / output module is connected with a limit switch, and an external alarm and a control instruction are input into the input / output module. And the temperature signal, the gap voltage current and the conductivity are converted by the analog-to-digital conversion module and then are input to the control module. The method has the beneficial effects that in the electric spark discharge machining operation process under the high-radiation boron-containing water environment of a nuclear power plant and the like, centralized and effective control over all field layer equipment is achieved, and the problem that conventional discharge machining equipment cannot be used under the high-radiation boron-containing water environment is solved.

The invention belongs to the technical field of thermal management, and provides a thermal management multi-way valve controlled by a digital circuit, which comprises a multi-way valve main body comprising a movement mechanism and a valve core; the digital control circuit module is used for receiving an external instruction and generating a driving signal; the motor driving module is connected with the digital control circuit module; the at least two physical limit switches (A and B) are arranged at the endpoint positions of the movement path of the valve core of the multi-way valve; the position feedback module is used for judging the position of the valve core according to the on-off state of the physical limit switch and carrying out logic comparison with a control signal; by integrating the digital control circuit module, the motor driving module, the physical limit switch, the position feedback module and other components, accurate control and position feedback of the valve element of the multi-way valve are achieved, and the performance and stability of the thermal management system are effectively improved.

The utility model discloses a novel sitting and standing dual-purpose bathing machine which comprises a support, a seat and a spraying rod. The support comprises a set of parallel and vertically-arranged supporting rods, the spraying rod is in a C shape and is in sliding connection with the supporting rods through sliding sleeves, automatic limiting switches are arranged on the sliding sleeves, and limiting blocks matched with the automatic limiting switches are arranged at the two ends of the supporting rods in a sliding mode. The seat is rotationally arranged on the lower portion of the support, an annular water spraying frame is arranged on the upper portion in the seat, a booster pump connected with the annular water spraying frame and the spraying rod is arranged in the seat, a driving part connected with the spraying rod is arranged in the seat, and a controller is arranged at the front end of the seat; the shower head is fixedly arranged on the support and connected with the booster pump through a hose. The bathing machine is simple in structure and convenient to use, can meet the use requirements of a user under different conditions, can achieve all-around flushing of the whole body under different use conditions, has the advantages of being high in flushing speed, thorough in flushing, time-saving, labor-saving and water-saving, and has extremely high use and popularization value.

The utility model discloses an intelligent walking mechanism used in a frozen coal and residual coal intelligent cleaning device of a car dumper, which comprises a track frame, limiting structures are arranged on two sides of the track frame, and a walking structure is arranged at the upper end of the track frame. The walking structure comprises a portal, four rail wheels, four driving assemblies and a wheel jacking assembly. The utility model relates to the technical field of intelligent cleaning of residual coal, which adopts a rail type walking support, two rails are laid on an original foundation, a portal steel structure is arranged above the rails, a portal is driven to walk at the upper ends of the rails in a variable frequency motor driving mode, and a matched cleaning device is used for cleaning the residual coal in a carriage. According to the cleaning device, the cleaning position can be accurately controlled, it is guaranteed that the whole cleaning process of the cleaning device is within the controllable range through the arranged limiting structure and the limiting switch control, and meanwhile, the wheels can be jacked through the arranged wheel jacking assembly so that the wheels can be conveniently maintained.

The invention relates to the technical field of anti-unmanned aerial vehicles, in particular to a net capturing power mechanism for anti-unmanned aerial vehicles, which comprises an unmanned aerial vehicle, a launch canister, a launch head and a connecting rope, launching cylinders are fixedly arranged at the lower ends of the unmanned aerial vehicles, the lower ends of the launching cylinders are in pushing connection with launching heads, the lower ends of the launching heads are connected with connecting ropes, the four launching cylinders, the four launching heads and the four connecting ropes are arranged on the four unmanned aerial vehicles, the four connecting ropes connect the four corners of the catching net, and the catching net is pushed in a pushing mode; the side end of the launching head is limited through a limiting switch, the limiting switch carries the launching head, the limiting switch is installed on a launching barrel, a double-acting hydraulic cylinder is arranged in the launching barrel, and the double-acting hydraulic cylinder stretches out and draws back in the launching barrel in a reciprocating mode. Through the arrangement of the structure, the net capturing work of the unmanned aerial vehicle is facilitated.

The utility model discloses a tubular belt conveyor with a torsion fault early warning function, which relates to the technical field of belt conveyors and comprises a frame type support, a roller mechanism and a conveying belt running in the frame type support. A first roller type limit switch and a second roller type limit switch are arranged at the top end of the section, which is overlapped into the circular tube shape, of the frame type bracket, wherein a wheel of the first roller type limit switch is pressed on the outer surface of the belt of the circular-tube-shaped conveyer belt, and the second roller type limit switch is arranged beside the first roller type limit switch; the vertical distance H between the bottom end of a wheel of the second roller type limit switch and the surface of the overlapped circular tube-shaped belt is 3-10mm, and the arc length L between the wheel of the second roller type limit switch and the side surface of the overlapped circular tube-shaped belt is 10-100mm; the two limit switches are respectively connected with the computer; compared with the prior art, an early warning can be given out in time for the torsion fault of the tubular conveying belt, an operator stops the machine in time for maintenance treatment, and the maintenance time for the torsion fault of the tubular conveying belt is greatly shortened.

The invention relates to an elevator steel wire rope swing protection device which comprises a fixing assembly installed on an elevator car and provided with a limiting switch. The guide device is mounted on the fixing assembly; the movable assembly is installed on the guide device and can move in the direction close to the fixed assembly under the guide of the guide device, and the steel wire rope moves in the movable assembly in the vertical direction; when the swing amplitude of the steel wire rope is larger than a threshold value, the movable assembly is pushed to make contact with the limiting switch, and the limiting switch is triggered. According to the elevator steel wire rope swing protection device, the swing conditions of the steel wire rope under various working conditions in a super high-rise building can be effectively monitored, and measures can be taken to protect elevator parts when the swing amplitude is large.

The application discloses a multifunctional massage bed, which comprises a support, a mounting plate, a massage assembly and a driving mechanism, the mounting plate is arranged below the support, a guide rail is arranged above the support, the massage assembly is movably arranged on the guide rail and can move back and forth along the guide rail to realize massage on a human body, and the driving mechanism comprises a motor, a limit switch, a movable switch and a control panel; the height of different users is set, when the length of the massage assembly exceeds the position of the human body during massage, the motor is stopped or reversed, so that the massage assembly is stopped or reversely moved, the massage assembly can always massage the human body, the massage assembly cannot move away from the human body, the idle running of the massage assembly is avoided, the loss is reduced, the energy is saved, and the cost is saved.

A self-tipping railway car with an automatic unloading detection device, belonging to the field of railway transportation, includes a self-tipping railway car with axle suppression mechanism. The left and right ends of the car's bottom are respectively mounted on the vehicle via a first cylinder and a second cylinder. A solenoid valve is mounted on the vehicle to control the intake and exhaust of the first and second cylinders. A battery box and a power supply box are mounted on the side bolster beams of the vehicle and are electrically connected. A signal transceiver is installed inside the power supply box and is electrically connected to a time relay. The time relay is electrically connected to the solenoid valve, controlling the first stage of the solenoid valve's operation. A first synchronous signal transceiver is installed inside the power supply box, and a second synchronous signal transceiver is installed on the end wall of the self-tipping railway car. A limit switch device detects the opening and closing status of the side doors of the self-tipping railway car. This design solves the problem of automatic unloading of the self-tipping railway car with axle suppression mechanism, eliminating the safety hazard of tipping over during the unloading process.

The utility model discloses a yellow phosphorus filling lifting platform which aims at solving the problems that an existing loading platform is not matched with a tank car, and the operation risk of personnel is large. The platform comprises a filling frame and a lifting platform capable of vertically sliding, the filling frame and the lifting platform are connected through a servo electric cylinder, the filling frame is provided with a guide structure, a guardrail and an anti-collision assembly, and the anti-collision assembly is in control connection with the servo electric cylinder. A connecting beam is arranged on the top of the lifting platform, and servo electric cylinders are arranged on the two sides in pairs and connected through connecting rods. A mounting seat of the filling frame is provided with a limiting bearing and a limiting notch. The anti-collision assembly comprises an anti-collision rod and a limiting switch. The platform can adapt to different tank trucks through the lifting platform and the servo electric cylinder, so that people can get on and off the truck conveniently; the operation safety is improved through a guardrail and a lifting function; a servo electric cylinder, a connecting beam and the like guarantee stable lifting; the anti-collision assembly can prevent equipment from being damaged. The existing problems are effectively solved, and the safety and convenience of yellow phosphorus filling operation are improved.

The utility model provides an angle detection limiting device and a movable arm type tower crane. The angle detection limiting device is applied to the movable arm type tower crane and comprises a detection collision block arranged between a buffer connecting rod and a buffer fixing block, the detection collision block is provided with a first end and a second end, and the first end of the detection collision block is rotationally connected with a buffer of the movable arm type tower crane; the limiting switch is fixed to the buffer fixing block and arranged on the moving path of the detection collision block, so that when the distance between the buffer connecting rod and the buffer fixing block is smaller than a preset distance threshold value, the detection collision block makes contact with the limiting switch and triggers the limiting switch, and the limiting switch is used for controlling a luffing mechanism of the movable arm type tower crane to work. According to the scheme, the structure is simple, installation and manufacturing are convenient, and the reliability of the limiting device can be guaranteed.

The utility model relates to a forklift technical field discloses a forklift anti -collision device, including the vehicle body, the vehicle body left end is provided with two cargo fork, the cargo fork left end all is provided with the approach inductive switch, the cargo fork left end all is fixedly connected with two springs, the spring left end is fixedly connected with the anti -collision inductor, the cargo fork top is provided with the tray, the vehicle body left end is provided with two limit switches, the vehicle body left end corresponding limit switch upper side all hinge connection has the anti -collision board. In the utility model, the anti -collision inductor can induct the object inside 0 5m range before the cargo fork and carry out ranging, and the driver is reminded, when the vehicle body still collides to the front shielding object at a certain speed because of the unexpected situation, the anti -collision inductor will touch the approach inductive switch installed in the cargo fork, and the control system of vehicle body is sent to the electric signal from the approach inductive switch, and emergency brake is carried out immediately, avoids the forklift to continue to go on to the collision body and causes the harm continuously.

The utility model provides a sewage collecting and discharging box and a cleaning device, the sewage collecting and discharging box comprises a box body and a base, a sewage discharging through opening is formed in the base, the base is connected with a sealing cover and a limiting switch plate, the sealing cover has a sealing state and a sewage discharging state, and the limiting switch plate has a sealing cover limiting position and a releasing position. The base is further provided with a switch plate locking structure, the switch plate locking structure comprises a stop piece, and the stop piece has a switch plate locking state in which the stop piece is connected with the limiting switch plate so that the limiting switch plate can be located at the sealing cover limiting position and a switch plate unlocking state in which the stop piece is disconnected with the limiting switch plate so that the limiting switch plate can be unlocked. According to the utility model, the pollution phenomenon caused by the opening of the drain outlet due to the fact that a user mistakenly touches the push plate which is arranged on the limit switch plate and protrudes out of the outer side of the base is prevented.

The utility model relates to a device for adjusting a seat (2), the seat is provided with a sitting part (4) and a backrest (6), the backrest can be adjusted between two final positions by means of an adjusting mechanism, namely between a vertical normal position and a folded position, the adjusting mechanism is provided with opposite rotating accessories (8), the rotating accessories are connected with each other through a shaft (10), and the rotating accessories are connected with the sitting part (4) through the shaft (10). The shaft is rotatable about an axis (12) of the shaft and extends along the axis (12) of the shaft in a longitudinal direction (L). Furthermore, a device for detecting two final positions is provided, which device has a spindle (24) connected to the shaft (10) and a spindle nut, which is displaced in translation in the longitudinal direction (L) when the shaft (10) is rotated, said spindle nut being part of a driver (26) having an actuating element (30) for a limit switch (32). According to the invention, the driver (26) is forcibly guided by means of a mechanical slotted guide (48) in such a way that a rotational movement of the driver (26) is superimposed on the translational movement, and the slotted guide (48) is designed in such a way that the actuating element (30) actuates the limit switch (32) in both final positions. Preferably, the locking mechanism (16) is also unlocked at the same time in order to turn over the foldable backrest.