50results about How to "Guaranteed detachability" patented technology

The invention discloses a minitype rubber bag accumulator for a shock absorber. A cylinder barrel of a shock absorber compensation chamber is formed by connecting an inner cylinder barrel body and an outer cylinder barrel body into a whole through threads. A gas sealing screw plug is screwed tightly on an inflating sealing flange and arranged in a compensation cavity of the inner cylinder barrel body. The concave part of the bottom of a minitype rubber bag is radially fixed to a protrusion of the bottom end of the cylinder barrel of the shock absorber. Through a floating piston and a minitype rubber bag accumulator assembly installed under the flowing piston, complete isolation of a damping oil chamber and an inert gas chamber is achieved. Fold-type minitype rubber bag outer lugs are sleeved with fastening aluminum alloy flanges, the rubber bag and the fastening aluminum alloy flanges are connected through bolts and the inflating sealing flange, thus isolation of damping oil liquid and high-pressure gas is achieved completely, and oil-gas mixing is avoided. The defect of damping oil liquid flowing filling hysteresis is further overcome, and the idle stroke hidden danger of the shock absorber is avoided. The minitype rubber bag accumulator is different from a traditional rubber bag accumulator, the rubber bag and the damping oil liquid are isolated completely, aging is not liable to occur, the service life of the rubber bag is prolonged, the work responsivity is high through the fold-type appearance design, and the working load bearing ability and impact resistance are high.

The invention discloses a multi-level pitch fracturing sliding sleeve capable of fishing ball seats. The multi-level fracturing sliding sleeve capable of fishing the ball seats comprises connectors, elastic claws and an elastic claw pipe. The connectors comprise the upper connector and the lower connector. The upper connector is connected with the lower connector, and the upper end of the upper connector is provided with an upper locating groove, a lower locating groove and a side hole. The multi-level pitch fracturing sliding sleeve further comprises a sliding sleeve mechanism and a ball seat fishing mechanism. When the sliding sleeve mechanism and the ball seat fishing mechanism move downwards for opening the sliding sleeve, elastic claw gaps in the sliding sleeve mechanism correspond to the side hole, and the elastic claw pipe is communicated inside and outside. Self-locking elastic claws which are matched with a ball seat fishing mechanism inside an upper-level sliding sleeve and a ball seat fishing mechanism in a lower-level sliding sleeve to be used for fishing the ball seats are arranged at the two ends of the ball seat fishing mechanism respectively. By means of the multi-level fracturing sliding sleeve, the effect that the sliding sleeve on the lower portion can realize fracture acidizing operation through sequential opening of pitches can be guaranteed, multiple levels of sliding sleeve ball seats and balls can be fished out at a time through a continuous oil pipe after the fracture acidizing operation, and therefore a drift diameter as large as possible can be obtained inside the pipe.

The invention provides an anaerobic adhesive for screw thread locking or pipe thread sealing, and solves the problems of unsatisfactory effect and large toxicity existing in present anaerobic adhesives modified by DOP or DBP. The anaerobic adhesive for screw thread locking or pipe thread sealing comprises 30-80wt% of an acrylate monomer, 1-5wt% of an initiator, 1-4wt% of an accelerant, 0-2wt% of a stabilizer, 5-50wt% of a plasticizer, and 0-20wt% of a viscosity modifier, and the plasticizer is recovered animal and vegetable oil. The recovered animal and vegetable oil, especially food waste oil is processed to be used as the plasticizer of the anaerobic adhesive, so the cured strength is reduced to maintain the detachability, the shrinkage is reduced, and the sealing performance is guaranteed.

The invention discloses an intelligent automatic branch pruning device, which is composed of a climbing mechanism, a pruning mechanism and a pressing mechanism, and is characterized in that a pruning mechanism is installed on the climbing mechanism, and a pressing mechanism is installed on the climbing mechanism . The advantage is that the intelligent automatic branch pruning device can replace manual branch pruning, which improves the efficiency of branch pruning and reduces the labor intensity of garden workers. Moreover, the device can realize the pruning of tree branches of different thicknesses. Different, the intelligent automatic branch pruning device can automatically adjust the internal spacing to meet the pruning work for trees of different thicknesses, avoiding the difficulty that the same branch pruning device cannot complete the job due to different tree thicknesses, improving the versatility of the branch pruning device, reducing pruning costs.

The invention belongs to the field of experimental equipment for the dynamic fracture toughness of a testing material and particularly relates to a three-point bending testing system based on the dynamic fracture toughness of the testing material. The system comprises a pedestal, wherein a support device, a loading rod, a knock rod, a compressed gas gun and a signal acquiring-processing device, a guide rail portion is arranged on the pedestal, and all the components are arranged on the guide rail portion and are fixedly connected and matched with the guide rail portion in a reciprocating guiding manner; the support device comprises a vertical plate which forms a matching portion matched with the guide rail portion, and grooves or through holes penetrating through a plate body are formed in the vertical plate; the support device further comprises a lining plate, and a through hole portion for being penetrated by the loading rod is arranged on the lining plate; lining units are further distributed on the lining plate; the supporting direction of the lining units, relative to a testing sample is opposite to the force applying direction of the loading rod. According to the system, the uniformity of acquired overall data can be guaranteed when the requirements of easiness in detaching and maintaining of a device are effectively realized.

The invention provides a simple carbon fiber composite circular rod body joint. The joint is composed of an internal cone, an external cone, a conical sleeve and a spring. The outer wall of the internal cone and the outer wall of the external cone are wedged, end surfaces of tail portions are flush, the tail portion of the external cone is installed in the conical sleeve, the tail portion of the external cone is provided with the spring, and the head portion of the external cone is of an internal conical structure. Reduction of the lengths of an internal conical sleeve and an external conical sleeve helps to improve the processing precision of an internal conical jacket surface and the consilience degree between an internal conical sleeve surface and an external conical sleeve surface, all the processes can be completed on general equipment, the processing procedures are simplified, and the processing difficulty and the cost are effectively reduced; protection rings at the two ends of the external conical sleeve can effectively protect a stress concentration portion between a compressed position and an uncompressed portion of a carbon fiber core rod so as to realize smooth transition of stress of the core rod; a multi-lobe structure can enable the external conical sleeve and the surface of a composite material to be closely attached, enables the stress to be uniform and improves the frictional force between the two so as to enable a hardware fitting to provide a sufficient holding force; and 4, the belleville spring is additionally arranged at the tail portion, such that the external conical sleeve can be effectively prevented from being loosened and rebounding from an internal conical jacket.

The invention discloses a foldable extending chair, and relates to the technical field of multifunctional chairs. The foldable extending chair comprises a chair back, a seat plate and supporting legs,wherein the supporting legs are fixedly connected to the lower surface of the seat plate, foot pads are fixedly connected to the lower surfaces of the supporting legs, the chair back is fixedly connected to one side of the seat plate, a fixed block is fixedly connected to one side of the upper surface of the seat plate, and a rotating shaft is movably connected to the activity center of the fixedblock. According to the foldable extending chair, by arranging a damper, an overturning supporting leg suffers from certain resistance during rotation, and is prevented from laterally falling duringsupporting; by arranging an auxiliary supporting mechanism, the stability of supporting can be guaranteed, and the extending chair is prevented from falling; by cooperatively arranging a supporting movable plate and an installing pipe, an overturning seat plate can be effectively supported; an installing groove is hinged to the overturning supporting leg, one chair can have more extending space for placing articles or allowing persons to sit down.

The invention belongs to the field of experiment equipment for testing the dynamic fracture toughness of a test material, and in particular relates to a three-point bending supporting device based on the dynamic fracture toughness of a test material. The device comprises a base plate and a vertical plate, wherein the base plate and an external support are detachably matched with each other; a groove or a through hole penetrating through a vertical plate body is formed in the vertical plate and is positioned at a loading rod traveling path. The device further comprises a lining plate which is arranged on the base plate, is parallel to the plate surface of the vertical plate and is arranged at the other end, which is opposite to the collision direction of a loading rod, of the vertical plate; a through hole part, through which the loading rod passes, is formed in the lining plate; a lining pad unit for holding a test sample to be tested is also arranged on the lining plate; the supporting direction, which is relative to the test sample to be tested, of the lining pad unit is opposite to the loading rod force application direction. The device is high in standardization degree, can effectively meet requirements on easy detaching and easy maintenance, and can also guarantee the uniformity of whole data acquisition so as to work reliably and stably.

The invention discloses a refrigerator which comprises a box body, a door body and a yogurt machine. A refrigerating chamber is arranged in the box body. The door body is provided with a bar counter inner frame and a bar counter door used for opening and closing the bar counter inner frame. The door body is arranged on the box body. When the door body is closed, the bar counter inner frame is located in the refrigerating chamber. The yogurt machine is arranged in the bar counter inner frame and is provided with a controller used for automatically controlling the heating time of the yogurt machine. The refrigerator integrates the yogurt manufacturing function and is simple and convenient in manufacturing process. Moreover, manufactured yogurt is good in taste.

The invention discloses a railway goods inspection intelligent detection device. The device comprises a portal frame which is fixed on the ground and allows a freight train to pass through; a first image acquisition unit which is fixed at the top of the portal frame and is used for shooting images at the top of the freight train; a second image acquisition unit which is mounted at the left side ofthe portal frame, faces the freight train and is used for shooting images at the left side of the freight train; a third image acquisition unit which is mounted at the right side of the portal frame,faces the freight train and is used for shooting images at the right side of the freight train; an infrared imaging camera which is fixed at the top of the portal frame; a laser radar which is fixedto the top of the portal frame; a speed measuring radar unit which is installed at one side of the portal frame and is used for detecting the running speed of the freight train; and a power supply unit which is connected with the first image acquisition unit, the second image acquisition unit, the third image acquisition unit, the infrared imaging camera, the laser radar, the speed measuring radarand a vehicle cutting sensor.

A corrugated pipe track ball valve comprises a valve rod, a valve cover, a valve seat and a ball body, a corrugated pipe is arranged between the valve rod and the valve cover, a valve cover nut is arranged on the outer side of the corrugated pipe, the valve cover nut is matched with the valve cover through a thread pair, a positioning shoulder welded to the corrugated pipe is arranged on the lower portion of the valve rod, and a guide pin is arranged on the valve cover. The valve rod is provided with a guide rail groove matched with the guide pin, the guide rail groove is linear, the upper portion of the ball body is provided with a 90-degree spiral groove hole, the lower end of the valve rod is provided with a 90-degree spiral guide rail matched with the 90-degree spiral groove hole, the central axis of the 90-degree spiral guide rail and the axis of the valve rod are provided with eccentricity, and the upper end face of the ball body is provided with an annular groove. And a thrust collar is embedded in the annular groove. The corrugated pipe track ball valve has the beneficial effects that many defects of a general ball valve are overcome through a simple and effective movement mode, no friction exists in the opening and closing process, zero leakage is achieved during closing, no friction exists between the ball body and the valve seat during opening and closing, and the opening and closing torque of the valve is reduced.

The invention relates to a method for restraining vortex-induced vibration in the hoisting process of an ultrahigh fan tower. A tower body is included, and a spiral turbulator is arranged on the outer circumferential surface of the tower body. The upper end of the turbulator is fixed to the top of the tower body through a binding belt, and the lower end of the turbulator is fixed to the bottom of the tower body through a binding belt. Short triangular prisms are connected into a whole through a rope, one end of the turbulator formed by the short triangular prisms is uniformly fixed to the binding belt at the top of the tower, cable ropes are mounted, and the bottom end of the turbulator is fixed to the outer circumferential surface of the tower body. According to the method for restraining vortex-induced vibration in the hoisting process of the ultrahigh fan tower, the tower turbulator is arranged, so that the hoisting stability of the ultrahigh tower is guaranteed; an active falling device is adopted by the turbulator, so that the mounting and dismounting construction speed is high; and the turbulator is bound through the ropes, so that detachability of the turbulator is guaranteed, construction efficiency is improved, construction cost is reduced, and construction safety is guaranteed.

The invention belongs to the technical field of installation of substation (converter) engineering large-sized lattice frameworks and particularly relates to a root distance control device based on a universal lattice framework lifting. The root distance control device at least comprises a telescoping main bar. Two ends of the main bar extend out in the length direction and are fixedly connected with corresponding frameworks respectively. The root distance control device further comprises a force adjustment unit used for adjusting telescoping length of the main bar to forcibly control the root distance of the two frameworks. The root distance of the two components is controlled by forcible mechanical forcing according to the fact that the large-sized lattice framework is difficult to adjust and root distance errors easily occur during installation; accordingly, subsequent manual adjustment is achieved. Even if the root distance error occurs during ground assembly of the framework, forced mechanical adjustment of the framework can be achieved. The root distance control device is simple in structure and simple to implement, control of the framework root distance is high in precision, adjusting effect is significant, and efficiency is high.

The invention provides a detachable assembled shear wall structure with replaceable components and an assembling method. Precast shear walls and a foundation and upper and lower layers of precast shear walls are both connected with each other through the replaceable components; and the precast shear walls and a precast floor slab are connected with each other through common bolts. According to thedetachable assembled shear wall structure with the replaceable components, each member and the replaceable components can be all precast in a factory and can be mounted after being transported to thesite. The precast shear walls are reinforced concrete shear walls which are industrially made and produced in a prefabrication factory. The precast floor slab is a reinforced concrete floor slab which is industrially made and produced in the prefabrication factory. According to the detachable assembled shear wall structure with the replaceable components, the detachability of the shear wall and the quick recovery of the structure after earthquake are realized, and requirements of structure assembled construction and building industrialization are satisfied.

A large-span mountain-shaped shading shed structure comprises a plurality of supporting stand columns, ridge lines, a cable net and two-way vertical fasteners. The top ends of the supporting stand columns are mutually connected through ridge lines, the multiple ridge line bearing triangles are mutually connected to form a mountain-shaped frame structure together with the supporting stand columns, the edge of the cable net is detachably fixed to the ridge lines, and the net face naturally droops to simulate the fluctuating slope face of a mountain. The top of the supporting stand column is in vertical bidirectional rotatable connection with the end part of the ridge line through a bidirectional vertical fastener; a plurality of cable net fixing fasteners are arranged on the ridge line, and the edge of the cable net is detachably connected with the cable net fixing fasteners; and the adjacent cable nets are detachably connected through the buckles. According to the structure, a deformable connecting mode and a natural suspension net shape are adopted, bidirectional bending moment of the ridge line can be released, the ridge line only transmits vertical and horizontal force to the supporting stand column, safety and stability of the supporting stand column and the ridge line are guaranteed, meanwhile, complex technological processes such as tensioning and shape finding are omitted, and the requirement of an architect for free creation of the mountain shape can be met.

The invention discloses a refrigerator which comprises a box body, a door body and a yogurt machine. A refrigerating chamber is arranged in the box body. The door body is provided with a bar counter bottle frame and a bar counter door. The door body is arranged on the box body. When the door body is closed, the bar counter bottle frame is located in the refrigerating chamber. The yogurt machine is arranged in the bar counter bottle frame and is provided with an article placing plane used for placing beverages, a fence surrounding the article placing plane, and a controller used for automatically controlling the heating time of the yogurt machine. The refrigerator integrates the yogurt manufacturing function and is simple and convenient in manufacturing process and high in bar counter space utilization rate. Moreover, manufactured yogurt is good in taste.

The invention belongs to the technical field of underground foundation pit engineering, and particularly relates to a prefabricated inner support edge node structure of a foundation pit and a construction method. The prefabricated inner support edge node structure comprises a prefabricated support and a top beam or a waist beam, wherein a first telescopic joint is fixed to the end of the prefabricated support, and a second telescopic joint is fixed to the inner side of the top beam or the waist beam; the first telescopic joint and the second telescopic joint are of the same structure and eachcomprise a solid steel plate, a U-shaped hole steel plate, a U-shaped steel plate and a stiffening plate; one end of the U-shaped steel plate penetrates through a U-shaped hole in the U-shaped hole steel plate and is welded to the solid steel plate, and multiple lines of long circular holes are formed in two side walls of the other end of the U-shaped steel plate; the solid steel plate is connected with the U-shaped hole steel plate through the stiffening plate; and the U-shaped steel plate of the first telescopic joint is clamped in the U-shaped steel plate of the second telescopic joint, andthe long circular hole in the first telescopic joint is connected with the long circular hole in the second telescopic joint through a bolt. According to the prefabricated inner support edge node structure, the requirements of rigid connection and equal-strength connection of side nodes can be met, the engineering safety is guaranteed, additionally, the length of the joints can be adjusted, and the construction error can be adjusted.

The invention belongs to the field of emergency communications, and in particular relates to a portable emergency communication instruction receiving display terminal. The terminal comprises an outer shell in which a diaphragm plate is arranged; a signal receiving processing PCB and a power source PCB are solid connected with two surfaces of the diaphragm plate in a clinging type, and the diaphragm plate is at least made of aluminum alloy convenient for radiating; the outer wall of the outer shell is provided with an antenna switching coaxial connector, a DC power source interface and a key PCB; the outer wall of the outer shell is further provided with a display screen component, the display screen component is respectively connected with the signal receiving processing PCB and the power source PCB to construct electric connection matching in winding displacement. Through the adoption of the terminal disclosed by the invention, the instruction receiving terminal in the emergency communication is independent in core function, extremely high in portability and environment suitability. The single pawn portability is strong, each carrier can form an independent point-to-point signal receiving terminal system by self, the site strain efficiency in the emergency event can be obviously promoted.

The invention discloses an oil tank and oil pump matching structure, an oil pump, an oil tank and an automobile. The oil tank and oil pump matching structure involves the oil tank, an oil pump assembly, an oil pump flange, an oil pump oil storage barrel and an oil pump fixing seat, wherein the oil tank is used for storing fuel oil; the oil pump assembly is used to deliver the fuel oil to an engine; the oil pump flange is fixedly connected with the oil tank and is used for fixing the oil pump assembly; the oil pump oil storage barrel is connected with the oil pump flange through an oil pump guide rod; the oil pump fixing seat is fixedly connected with the oil tank and is used for fixing the oil pump oil storage barrel; and the oil pump fixing seat is matched with the oil pump oil storage barrel, so that when the oil pump oil storage barrel rotates in a first direction relative to the oil pump fixing seat, the oil pump oil storage barrel and the oil pump fixing seat are fastened, and when the oil pump oil storage barrel rotates in a second direction relative to the oil pump fixing seat, the oil pump oil storage barrel is loosened from the oil pump fixing seat. According to the oil tank and oil pump matching structure, the detachable property of the oil pump can be maintained while the strength and rigidity of the oil tank are enhanced.

The invention discloses a bolt-jointed detachable assembled shear wall structure. The connection schemes of the detachable bolt-jointed assembled shear wall structure system are divided into horizontal seam connection, vertical seam connection and floor slab connection. The invention has the advantages of easy disassembly, easy repair, reusability, etc., and is beneficial to realize the detachable function of the structure and the fast repairable function after an earthquake. In the present invention, both the horizontal joints and the vertical joints are spliced ​​by bolts, without pouring concrete or mortar, and all components can be disassembled. At the same time, the present invention mainly concentrates energy consumption and damage on the replaceable connecting steel plates, which is beneficial to the repair or replacement of the replaceable connecting steel plates after strong earthquakes, and achieves the purpose of quickly repairing the structure after earthquakes.

The invention discloses a detachable floor system connecting joint for a modular steel structure and a manufacturing method thereof. The connecting joint comprises modular ceilings, modular floor slabs and ceiling slab beam connecting assemblies. According to the detachable floor system connecting joint for the modular steel structure and the manufacturing method thereof, detachable floor system connecting structures are arranged at the joints between the adjacent modular ceiling slab beams, horizontal connection between modular units is enhanced, and the problems that when the modular units on the same layer are spliced, due to the fact that the floor slabs are discontinuous, the modular steel structure is excessively deformed in the plane, and the rigidity in the plane of the floor slabs is insufficient are solved; and meanwhile, the welding parts of the connecting structures are completed in a factory in advance, after the connecting structures are transported to the site, high-strength bolts are adopted for on-site assembly, no welding exists on the site, when the service life of the structure is due and the structure needs to be disassembled, the adjacent modular units can be separated by unscrewing the high-strength bolts, the overall stress performance of the modular steel structure can be considered on the premise that the assembly advantages of a modular building are exerted, and the integrity, construction convenience and detachability of the modular steel structure are guaranteed.

The invention discloses a minitype rubber bag accumulator for a shock absorber. A cylinder barrel of a shock absorber compensation chamber is formed by connecting an inner cylinder barrel body and an outer cylinder barrel body into a whole through threads. A gas sealing screw plug is screwed tightly on an inflating sealing flange and arranged in a compensation cavity of the inner cylinder barrel body. The concave part of the bottom of a minitype rubber bag is radially fixed to a protrusion of the bottom end of the cylinder barrel of the shock absorber. Through a floating piston and a minitype rubber bag accumulator assembly installed under the flowing piston, complete isolation of a damping oil chamber and an inert gas chamber is achieved. Fold-type minitype rubber bag outer lugs are sleeved with fastening aluminum alloy flanges, the rubber bag and the fastening aluminum alloy flanges are connected through bolts and the inflating sealing flange, thus isolation of damping oil liquid and high-pressure gas is achieved completely, and oil-gas mixing is avoided. The defect of damping oil liquid flowing filling hysteresis is further overcome, and the idle stroke hidden danger of the shock absorber is avoided. The minitype rubber bag accumulator is different from a traditional rubber bag accumulator, the rubber bag and the damping oil liquid are isolated completely, aging is not liable to occur, the service life of the rubber bag is prolonged, the work responsivity is high through the fold-type appearance design, and the working load bearing ability and impact resistance are high.

The invention discloses a method for bushing repairing of a thread hole, and belongs to the technical field of mechanical part repairing treatment. The method comprises following steps that S1, chambering for defect removing is achieved, the thread hole A to be repaired is chamfered to the pre-designed bushing size, the defect part is removed, a 30 to 60-degree chamfer is reamed on the edge opening part of the thread hole A; S2, a filling part is prepared, a material the same with or similar to base metal is selected, and a filling part matched with the thread hole A is turned; S3, the threadhole is filled; S4, welding is carried out, according to the welding parameters, the filling part is welded on the chamfering part, full welding chamfering is carried, and in the welding process, welding deforming is controlled; S5, primary leveling is carried out; S6, a set screw is assembled; S7, secondary leveling is carried out; and S8, trepanning is carried out. The method has the beneficialeffects that thread deforming of a new thread hole in the assembling process can be avoided, an original bolt can be still used, the detaching of the original size can be kept, the workpiece integration is improved, and the anti-vibration property and the anti-tensile property of a workpiece are optimized.

The invention discloses a hand-operated tablet press machine, comprising a frame, the right side of the frame is fixedly connected with a fixed plate, the right side of the fixed plate extends to the end and is movably connected with an outer main shaft, and the top of the frame is fixedly installed There is a handle bar, the inner main shaft is closely connected to the upper side of the middle part of the frame, the main shaft fixing steel ring is closely connected to the right side of the inner main shaft, the lifting cam is movably connected to the left side of the inner main shaft, and the lower right side of the lifting cam A lifting tube is movably connected, the left side of the fixed steel ring of the main shaft is fixedly connected with an eccentric wheel, the upper end of the eccentric wheel is fixedly connected with a brake button, and the lower part of the eccentric wheel extends to the end and is tightly connected with a connecting rod. Compared with the traditional hand-operated tablet press, the tablet press effectively reduces the noise generated during the operation of the machine. The rollers are connected by bearings to reduce mechanical wear, prolong the service life of the machine, limit the input of raw materials, and ensure the quality of the finished product. quality.

The purpose of the present invention is to provide a preparation process of a ceramic core and superalloy cavity structure casting, wherein the preparation process of the ceramic core is: dividing the inner cavity into left and right half cavities at the maximum section of the casting inner cavity Structure, prepare the left and right half-core wax molds that are completely consistent with the shape and size of the internal cavity structure of the casting, and the inner dimensions corresponding to the concave parts of the left and right half-core wax molds are exactly the same as the outer structure dimensions of the ceramic core; The left and right half-model cores are prepared by the precision casting process. After the half-model cores are dried, they are dewaxed and roasted. After sintering, the largest cross-sections of the left and right half-model cores are trimmed. Negative tolerances are reserved for the left and right trimmed surfaces; bonding is used The left and right half-mold ceramic cores are combined into a monolithic ceramic core, and then dried for 4-8 hours to obtain a ceramic core for superalloy castings. The method can improve the comprehensive performance of the ceramic core, simplify the preparation process and process, ensure the matching between the core and the mold shell and reduce the casting cost.

The invention discloses a home elevator pit maintenance safety protection device. The home elevator pit maintenance safety protection device is characterized in that an ejector rod mounting support ismounted on one side of a guide rail, connecting angle steel is fixedly to one side of the ejector rod mounting support through a connecting plate, a switch mounting support is mounted on the connecting plate, a limit switch is arranged on the switch mounting support, the ejector rod connecting plate is installed on the inner side of the connecting angle steel, and one end of the ejector rod connecting plate is connected with an ejector rod used for abutting against a lift car through bolts. By the adoption of a hinge four-rod mechanism, the structure is simple, use is convenient, an elevatorcan quickly enter an anti-falling state, the situation that an electrical system, a spring and other complex structures need to be used in the past is avoided, the manufacturing cost is greatly reduced, and meanwhile the adverse situation that the elevator is connected and fixed to a pit through bolts in the past is avoided.