1351 results about "Limit switch" patented technology

Provided in the present disclosure are a roller shutter tail cover and a roller shutter cover with the same. The roller shutter tail cover includes a cover body, a limit switch, and a limit device, where the limit switch is disposed on the cover body, and the limit device is connected to the limit switch. During motion of the roller shutter tail cover, when the limit switch is touched, the limit switch starts the limit device, and the limit device works to limit the motion of the roller shutter tail cover. During motion of the roller shutter tail cover, if the roller shutter tail cover touches other objects, the limit switch starts the limit device, and the limit device limits the motion of the roller shutter tail cover, thereby preventing the roller shutter tail cover from pinching other objects and lowering the safety risk.

The invention relates to a bidirectional automatic seedbed and potted flower transfer device and method. The bidirectional automatic seedbed and potted flower transfer device comprises a conveying mechanism, a lifting mechanism, a push-pull mechanism, a grabbing mechanism, a conveying mechanism and a control system. The conveying mechanism comprises a seedbed frame, a motor, a chain, a transverse conveying supporting wheel and a chain wheel, the lifting mechanism comprises an air cylinder, a telescopic rod and a supporting rod supported on an air cylinder shaft and the telescopic rod, the push-pull mechanism comprises a push plate, a small air cylinder, a moving frame, a rail and a motor, and the grabbing mechanism comprises a portal frame and a mechanical arm. The conveying mechanism comprises a guide frame, an angle iron rail and a belt conveyor; the control system comprises a controller, a limit switch, a proximity switch, a magnetic reed switch and a photoelectric counter and is used for monitoring the position of the seedbed, accurately starting and stopping the seedbed and counting flowers. Bidirectional orderly automatic transfer of potted flowers entering and moving out of a cultivation greenhouse can be achieved, the working efficiency is improved, and the labor intensity is reduced.

The invention relates to the technical field of safety limit switch testing, in particular to a safety limit switch testing method, system and device and a medium. The method comprises the steps that firstly, model information of a to-be-tested switch is acquired, and test parameters are called from a preset evaluation model; by analyzing historical test data of elevator switches of the same batch, a test sequence of actual action point dispersion analysis and target interval dense sampling is established, and a reference action point and a sampling frequency are determined; the system drives the limit switch to move according to the called reference action point and the sampling frequency, the actual action point of the switch is measured, and the system carries out reciprocating motion test at the position of the actual action point to obtain action stability data; meanwhile, high-frequency continuous sampling is carried out in a switch on state to obtain time sequence changes of on-resistance values; and finally, according to the time sequence characteristics of the on-resistance and a preset calculation method, calculating a switch performance index, generating a test result and printing a unique SN label, thereby realizing whole-course tracing of the product.

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.

The invention discloses a transformer coil winding device which comprises a winding machine body, a knocking device, a pressing device and an auxiliary rod, and an iron core is arranged on the winding machine body; the flat copper conductor penetrates through the winding machine body and is wound on the iron core; the knocking device is arranged on the winding machine body; the pressing device comprises a rotating shaft, an elastic pressing structure, a first spring and a driving structure, and the rotating shaft is arranged on the winding machine body and connected with the driving structure; the elastic pressing structure is arranged on the rotating shaft in a sliding manner; the two first springs are arranged on the two sides of the elastic pressing structure correspondingly. The auxiliary rod is arranged above the pressing device, limiting switches are arranged at the two ends of the auxiliary rod respectively, and the pressing structure makes contact with the limiting switches when moving. According to the application, the flat copper wires are knocked through the knocking device, so that the flat copper wires are more attached to the surface of the iron core, the flat copper wires can be dynamically pressed through the pressing device, the flat copper wires wound on the iron core are tighter, and the electrical performance is improved.

The invention discloses an automatic protective door device for a cylinder of a vertical machining center, which relates to the technical field of machine tools and comprises a protective door arranged at an opening of a protective room in a sliding manner; the air cylinder transmission assembly is arranged above the protective door and comprises a three-position five-way middle-discharging electromagnetic valve and a telescopic air cylinder, an exhaust hole is formed in one end of the three-position five-way middle-discharging electromagnetic valve, the other end of the three-position five-way middle-discharging electromagnetic valve is connected with the telescopic air cylinder, and the output end of the telescopic air cylinder is connected with the protective door; the limiting switch assembly is arranged above the protective door and comprises a pair of limiting switches and a limiting block, the limiting block is arranged on the protective door, when the protective door reaches the door opening position, the limiting block abuts against one limiting switch, and when the protective door reaches the door closing position, the limiting block abuts against the other limiting switch; the control unit is in control connection with the two assemblies; the device solves the problems that the cylinder protection automatic door is loosened and easy to damage, the door opening and closing signal acquisition is unsafe and inaccurate, and the power-off operation and maintenance are difficult.

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 invention discloses a trigger type low-power-consumption awakening valve opening and closing state online monitoring system, and relates to the technical field of petroleum drilling and production equipment safety, and the system comprises a valve state monitor, a data acquisition and distribution module, a cloud platform and a monitoring terminal; the valve state monitor comprises a limit switch, a main control chip and a Zigbee communication module. Two low-power-consumption modes, namely a power-down mode and a shutdown mode, of the main control chip are adopted, two external interrupts are provided, and the chip can be awakened by the rising edge and the falling edge of the external interrupts. The low-power-consumption Zigbee communication module is used as a dormant terminal, when data needs to be sent, the main control chip pulls down the pin awakening module and sends the data, after sending is completed, the pin is pulled up, the module continues to be dormant, and the low power consumption is further reduced. Therefore, the valve state monitoring instrument can be used for a long time, and the service life of state monitoring equipment is prolonged. In consideration of the requirements of low power consumption and transmission distance, Zigbee communication is used as wireless communication.

The invention provides an automatic windproof zipper device of a grab ship unloader, and belongs to windproof devices of ship unloaders. The device comprises an automatic windproof zipper structure and a driving mechanism, the automatic windproof zipper structure comprises an upper pull rod, a bracket, a limit switch, a lower pull rod and a zipper seat, the automatic windproof zipper device is arranged on a sill beam of the ship unloader, the upper portion of the automatic windproof zipper device is connected with lifting lugs on the two sides of the sill beam, and the zipper base is installed on the wharf ground through flange bolts. The upper pull rod is connected with the driving mechanism through a flange bolt, and the driving mechanism is connected with the lower pull rod through a flange bolt; the other end of the lower pull rod is inserted into the zipper seat; a bracket is also arranged on the upper pull rod; and a limit switch is arranged between the upper pull rod and the lower pull rod. According to the device, various problems of tedious manual operation, long operation time and the like of grab ship unloader equipment are solved; the lifting, falling and tensioning positions of the automatic windproof device are detected through limiting, and the positions are accurate.

The invention discloses a pastry forming machine convenient to demould. The device comprises a base, and a lower die capable of moving up and down through a lower die lifting device and an upper die capable of moving up and down through an upper die lifting device are arranged on the base; the lower die lifting device comprises a power device which is installed on the side face of the base and provided with a telescopic rod, and the telescopic rod is connected with a push plate with a guide inclined face on the upper surface. A guide stand column is arranged at the bottom of the lower die and makes contact with the guide inclined face. The device has the advantages that the whole lower mold is lifted and descended through the contact and position relation change of the guide stand columns and the guide slopes, the structure is compact and simple, the lower mold is taken out and replaced more easily, the demolding process is more convenient, and the efficiency is greatly improved; due to the limiting switches which are oppositely arranged inwards in the vertical direction, the upper mold can automatically stop after reaching the preset position, the positions of the limiting switches are adjustable, the requirements for making various different pastries can be better met, and the adaptability is higher.

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 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. The elevator steel wire rope swing protection device can effectively monitor the swing conditions of the steel wire rope under various working conditions in a super high-rise building, and measures can be taken to protect elevator parts when the swing amplitude is large.

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.

An aerial work platform, and a method and apparatus for safety control of an aerial work platform, said method comprising: determining whether a work platform (100) is located at an upper limit position or a lower limit position; acquiring a first angle value of a scissor frame (200) corresponding to the upper limit position, and using the first angle value as an upper limit calibration value; or acquiring a second angle value of the scissor frame (200) corresponding to the lower limit position, and using the second angle value as a lower limit calibration value; acquiring a current angle value of the scissor frame (200) and a current inclination angle value of a chassis (300); and, on the basis of the current angle value of the scissor frame (200) and the current inclination angle value of the chassis (300), determining an angle compensation value for the work platform (100), and, on the basis of the difference between the angle compensation value and the upper limit calibration value or the lower limit calibration value, determining a limit position of the work platform (100). Thus, a limiting structure or a limiting switch can be replaced for limiting, operation is intelligent, the reliability is high, and fault alarms caused by a stroke switch being stuck can be prevented, so as to save operation costs.

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 utility model discloses an aerial work platform anti-collision device which comprises a mounting base, a telescopic rod, a limit switch and a spring, and the interior of the mounting base is hollow and forms a first space; the telescopic rod is arranged in the mounting base, the telescopic rod is arranged in the first direction and moves in the first direction, a pressing plate is arranged on the telescopic rod, the pressing plate protrudes out of the outer surface of the telescopic rod, and the pressing plate is perpendicular to the telescopic rod; the limiting switch is arranged on the outer side of the mounting seat and below the pressing plate, and the limiting switch is provided with a contact surface in contact with the pressing plate; the spring is arranged in the mounting base, one end of the spring abuts against the lower surface of the pressing plate, and the spring drives the pressing plate and the telescopic rod to move in the first direction. According to the utility model, the limit switch is adopted, a circuit can be disconnected when collision occurs, and meanwhile, the controller can detect a system loop in real time and limit the lifting action, so that collision and extrusion accidents are avoided. The spring is adopted, the pressing rod and the telescopic rod are reset in time to keep the working process, and the working efficiency is improved.

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 a full-automatic high-frequency transformer typesetting machine which comprises a support, a typesetting platform fixed on the support, a guide rail strip arranged on the top face of the typesetting platform, a supporting platform, a placing plate supporting panel, a driving structure and a limiting switch. The guide rail strip is fixed to the top face of the typesetting platform, a strip-shaped sliding groove is formed in the typesetting platform, and the supporting platform is fixed to the edge of the typesetting platform and located on the center line of the guide rail strip. The bottom surface of the placing plate supporting panel is slidably arranged on the guide rail strip through a sliding block; the driving structure is fixed on the bottom surface of the typesetting platform, and the driving structure and the placing plate support panel are arranged on the typesetting platform. The transformer placing device is reasonable in structural arrangement, simple in structure and beneficial to cost reduction, the driving structure is matched with the placing plate supporting panel to horizontally move on the guide rail strips, and therefore the placing uniformity of a transformer can be effectively improved, the space of the placing plate can be saved, the use stability can be improved, and the transformer placing device is high in applicability and good in practicability.

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 belongs to the technical field of performance testing, and particularly relates to a Hall sensor rotating speed testing device with an adjustable interval. The ball screw motor and the rotary encoder are connected with the ball screw support, the ball screw support is used for fixing and supporting the screw, the nut is fixed on the screw, the rotary motion of the nut is converted into linear motion to drive the workbench to move, the limit switch is installed on the ball screw support, and the sensor connector is fixed on the workbench. The Hall sensor is fixed in the sensor connector, the control signal processing module is connected with the rotating shaft motor, the rotating shaft is installed above the rotating shaft motor, the magnetic steel A and the magnetic steel B are symmetrically installed on the rotating shaft and used for triggering the Hall sensor, and the limiting switch is connected with the control signal processing module for control. The performance of the Hall sensor is tested, so that the safety and the reliability of the nuclear power station are improved.

The invention discloses an electric power insulation tape which comprises an insulation tape, an opening mechanism and a shell body formed by tightly connecting a first shell and a second shell, the insulation tape is wound and arranged in the shell body, one side of the shell body is provided with an opening, the movable end of the insulation tape faces the outer side of the opening, and the opening mechanism is arranged on the outer side of the opening. The opening mechanism comprises a rotary limiting device and a limiting switch device, and the rotary limiting device comprises a rotary rod and a first functional gear; the limiting switch device comprises a limiting shell, a first clamping plate, an elastic assembly, a connecting rod, a second clamping plate and a second functional gear, the rotating rod is fixedly sleeved with the first functional gear, and the rotating rod is used for controlling the second shell to be opened / closed through rotation. According to the electric insulation measuring tape provided by the invention, the interior of the insulating shell of the measuring tape can be conveniently cleaned, and the convenience of dismounting the measuring tape is improved.

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 specifically relates to a European double-beam gantry crane, comprising two main beams arranged at intervals, end beams are installed at both ends of the main beams, outriggers are installed at the bottom of the end beams, the outriggers are installed on the top of a large frame, a track is installed on the top of the main beam, a trolley frame travels on the track, a mounting plate is installed on the top of the trolley frame, an electric hoist is installed on the top of the mounting plate, a steel wire rope of the electric hoist passes downward through the mounting plate, the tail of the steel wire rope is installed on a movable pulley, the movable pulley is installed on a pulley frame, a hook is installed at the bottom of the pulley frame, an anti-derail mechanism is arranged below the mounting plate, the anti-derail mechanism can prevent the trolley frame from derailing due to the hook hitting the top and hitting the trolley frame; double protection is performed by rotating a limit switch and an infrared sensor.

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.