69results about How to "Prevent fallback" patented technology

The invention provides a geological drilling pipe taking device and method, and relates to the technical field of fishing tools. The structure comprises a mandrel, an outer suspension joint, an inner suspension joint and a slip structure, the mandrel is arranged in the inner suspension joint, the slip structure is arranged on the outer side wall of the mandrel in a sleeving mode, the outer suspension joint is arranged on the outer side wall of the inner suspension joint in a sleeving mode, and the outer suspension joint is detachably connected with the slip structure. A tile radial movement expanding structure used for controlling the slip structure is arranged in the mandrel, and an expanding and milling structure is arranged at the end, deviating from the inner suspension connector, of the mandrel; the expanding and milling structure and the slip structure are matched together to complete cutting and fishing of the casing pipe at a time, and therefore the casing pipe cutting and fishing efficiency is improved.

The invention relates to the technical field of tension machines, in particular to a self-locking safety hydraulic tension machine which comprises a movable chassis, a tension wheel used for winding a cable is arranged on the upper portion of the movable chassis, a mounting frame is arranged at the conveying end of the tension wheel, and a locking device used for preventing the cable from returning is arranged on the mounting frame. The locking device comprises a bottom plate arranged in the cable conveying direction, a trigger device used for monitoring the cable conveying direction is arranged on the upper portion of the bottom plate, and the output end of the trigger device is connected with a blocking device used for clamping the cable, so that the reaction sensitivity is guaranteed, and the use safety is greatly guaranteed.

This application relates to a pin bending device for electrical connectors, belonging to the field of pin bending technology. The device includes a base, a feeding mechanism, an assembly mechanism, and a bending mechanism. The feeding mechanism includes a housing conveying assembly and a pin conveying assembly. The housing conveying assembly is located at one end of the base along its length, and the pin conveying assembly is located on the base. The housing conveying assembly can convey the housing, and the pin conveying assembly can convey the pin. The assembly mechanism is located on the base and on one side of the housing conveying assembly along its length. The assembly mechanism can receive the housing and the pin and assemble and fix them to form a terminal. The bending mechanism is located on the base and can perform two bends on the pin. This application aims to solve the problem of low production efficiency caused by the difficulty in simultaneously achieving automated assembly and bending.

The invention relates to the technical field of steel wire pipe production, in particular to steel wire pipe online material separating and pushing equipment which comprises two external connecting plates used for being connected with an external machine tool, lead screws are installed on one sides of the two external connecting plates in a threaded mode, and a working platform is jointly and fixedly installed at the tops of the two lead screws. An inclined placing plate is arranged on one side of the external connecting plate; the pushing assembly is arranged below the working platform; and the multiple feeding assemblies are all arranged above the inclined containing plate. Compared with the prior art, the feeding assembly is internally provided with the conveying module, so that the feeding assembly can adapt to steel wire pipes of different specifications, and the automation level of feeding and the universality and flexibility of the whole equipment are improved.

The water dispenser convenient to assemble comprises a dispenser body, the dispenser body comprises a shell with a mounting cavity, the mounting cavity is provided with a front side opening, the dispenser body further comprises a front cover used for sealing the front side opening, and a surrounding edge protruding in the direction away from the front cover is arranged on the circumferential edge of the front cover; the shell is provided with a guide part, the surrounding edge is in guide fit with the guide part to pre-position the front cover, and a buckle structure for fixing the front cover and the shell is further arranged between the front cover and the shell. When the front cover and the shell are assembled, pre-positioning of the front cover can be realized through matching of the surrounding edge and the guide part, on the basis, the front cover and the shell are fixed, so that the assembling difficulty is reduced, the assembling efficiency is improved, and the front cover can be prevented from deviating from the mounting position in the mounting process through pre-positioning of the front cover; the front cover and the shell are fixed, favorable conditions are provided for fixing the front cover and the shell, the requirement for operators is low, the front cover and the shell are fixed in a buckled mode, operation is easy, and efficiency is high.

The radial flexible mechanism of the scroll compressor comprises a main shaft, a crankshaft seat is arranged at the output end of the main shaft, an eccentric hole is axially formed in the end portion of the end, away from the main shaft, of the crankshaft seat, and a crank pin is fixedly connected into the eccentric hole. The outer side of the end, away from the crankshaft seat, of the crank pin is fixedly sleeved with an eccentric shaft sleeve, one side of the eccentric shaft sleeve is fixedly connected with an eccentric block, a limiting groove is formed in the outer side of the end, close to the eccentric block, of the crankshaft seat, and an elastic washer is arranged on the inner side of the limiting groove. The groove is formed in the outer side of the crankshaft seat on the main shaft, and the rubber ring is fixed on the crankshaft, so that the collision between the eccentric block and the crankshaft is avoided, and the NVH (Noise Vibration and Harshness) performance is favorably improved; due to the fact that the rubber ring is additionally arranged, the self-aligning function has a buffering function, too intense self-aligning and rollback are avoided, and the movable disc of the compressor is more stable in operation, low in noise and good in NVH expression homogeneity.

The utility model discloses a CJT type standard hydraulic cylinder with a locking function. The CJT type standard hydraulic cylinder comprises a limiting mechanism and a hydraulic cylinder body installed in the middle of the limiting mechanism. A buffering mechanism is fixedly installed at the center position of the top face of the limiting mechanism, and one side of the buffering mechanism is fixedly connected to one side of the hydraulic cylinder body. The limiting mechanism comprises a hydraulic cylinder body, a piston rod is slidably connected to the interior of the hydraulic cylinder body, and supporting sleeves are fixedly connected to the left side and the right side of the hydraulic cylinder body; limiting frames are fixedly connected to the upper side and the lower side of one end of the supporting sleeve, and limiting columns are fixedly connected to one sides of the interiors of the limiting frames. By arranging the limiting mechanism, the situation that the hydraulic cylinder is damaged due to the fact that the piston rod retreats when the hydraulic cylinder is subjected to counter-acting force of a pushed object in the using process can be avoided, and by arranging the buffering mechanism, the hydraulic cylinder body can be protected and prevented from being damaged due to collision in the using process and the like.

The utility model provides a kind of glass material camouflage net traction structure, the utility model relates to camouflage equipment technical field, it includes main component, main component contains type piece, multiple pivot and pinion;Second pivot is rotatably connected with winding wheel, and main component side is connected with traction assembly by traction line.This utility model realizes the convenient traction of glass material camouflage net by the cooperation of main component, winding wheel, traction assembly and locking assembly, and it is labor-saving to operate;Winding wheel ensures that traction line is orderly received and released, and traction is stable;Locking assembly prevents traction line from backtracking, improves use safety and reliability, and has higher practical value.

The dewatering vibration device comprises a water tank, a primary screening and dewatering tank and a secondary screening and dewatering tank, the primary screening and dewatering tank is installed over the water tank through an elastic supporting assembly, and the primary screening and dewatering tank is gradually and upwards obliquely arranged from the front feeding end to the rear discharging end; primary screening meshes are evenly distributed in a groove bottom plate of the primary screening and dewatering groove, a vibration assembly is installed on the primary screening and dewatering groove, a material blocking transverse strip is installed in the primary screening and dewatering groove, the secondary screening groove is fixedly installed at the rear discharging end of the primary screening and dewatering groove, secondary screening meshes are evenly distributed in a groove bottom plate of the secondary screening groove, and a material blocking transverse strip is installed in the secondary screening and dewatering groove. An oversize product discharging port is formed in the rear discharging end of the secondary screening groove, an undersize product collecting and discharging groove is formed under the secondary screening groove, a slag discharging port is formed in the lower portion of the water tank, and a filtering box is arranged in the water tank. The dehydration device has the advantages of high use stability and good dehydration effect.

The utility model provides a jet grouting anchor cable, which belongs to the technical field of support engineering, and comprises an anchor head plate, a steel strand and a hoop ring, the anchor head plate is provided with a drill bit hole and a wire inlet hole, and the periphery of the wire inlet hole is uniformly provided with a plurality of wire return holes; one end of the steel strand penetrates through the wire inlet hole, and the part, penetrating through the wire inlet hole, of the steel wire penetrates back into the wire return hole; and the steel wire penetrating through the wire return hole is hooped on the steel strand by the hoop ring. According to the utility model, the connection firmness of the steel strand and the anchor head plate is improved, and the possibility of loosening and falling of the steel strand is reduced.

The utility model discloses a film slitter, relates to the technical field of film cutting, and adopts the scheme that the film slitter comprises a lower shell and an upper shell which are matched with each other, a film roll is placed between the lower shell and the upper shell, and adjustable elastic clamping mechanisms are mounted on two sides of the outer surface of the lower shell in a penetrating manner; the adjustable elastic clamping mechanism can be used for clamping and limiting thin film rolls with different widths, practicability is improved, the elastic supporting conveying mechanism is arranged, a second spring drives a bottom plate to extrude upwards, and the elastic supporting conveying mechanism is used for clamping and limiting the thin film rolls with different widths. According to the slitting device, the remaining end of a film after slitting can be fixed, the film is prevented from retreating, a rotary knob is rotated to drive a rotary shaft and a friction roller to rotate, and therefore the slit end can be conveyed out under cooperation of a bottom plate and can be conveniently used next time.

The utility model provides an experimental animal grabbing device. The experimental animal grabbing device comprises a box body with an inner cavity, a guide pipe arranged in the inner cavity, a first clamping assembly arranged at the tail end of the guide pipe, a second clamping assembly connected to the bottom of the box body in a sliding mode, and a first driving part for driving the second clamping assembly to slide. The first clamping assembly is used for clamping the head of an experimental sample, and a sensor for monitoring the experimental sample is arranged at the tail of the guide tube. A storage assembly is further arranged in the box body, a rubber sleeve is arranged in the storage assembly, a sleeving assembly for driving the rubber sleeve to move to the head of the experimental sample is arranged in the box body, and an elastic connecting piece connected with the rubber sleeve is arranged at the top of the box body. A first linear module is arranged at the top of the box body and drives the sleeving assembly to slide in the length direction of the box body. The second clamping assembly is used for clamping the body of the experimental sample. According to the animal experiment sample grabbing device, one-time grabbing is firm, animal samples are prevented from being damaged, the effectiveness of animal experiment sample grabbing is guaranteed, and the personal safety of operators is effectively protected.

The utility model relates to the technical field of medical devices, and discloses a tearable sheath, which comprises a sheath tube main body seat, a hemostasis valve main body and a dilator handle, the bottom of the sheath tube main body seat is fixedly connected with a tube body, a mounting groove is arranged in the hemostasis valve main body, two sides in the mounting groove are fixedly connected with positioning ribs, and the positioning ribs are fixedly connected with the dilator handle. A cap is arranged at the top of the hemostasis valve body, a cap protrusion is arranged on the cap, a first sealing gasket is arranged in the mounting groove, a second sealing gasket is arranged at the top of the first sealing gasket, and a dismounting assembly is arranged at the bottom of the hemostasis valve body. According to the utility model, the sheathing canal main body seat, the sheathing canal clamping jaw, the hemostasis valve main body, the connecting column, the groove and the O-shaped sealing ring are matched to work, the hemostasis valve and the sheathing canal are split, the hemostasis valve is detached during tearing, only the canal seat and the sheathing canal body need to be torn, the tearing force can be reduced, and the hemostasis valve main body seat and the sheathing canal main body are rotationally locked through the buckle, so that the hemostasis valve is convenient to use. The operation is convenient.

The present invention is a shaft construction device and construction method, the shaft construction device includes a transmission device, a jacking device and a tunneling device, the tunneling device is arranged at the wellhead position; the jacking device includes a jacking support, a first slide rail, a second slide rail and a jacking mechanism, the jacking support is arranged near the wellhead position, the transmission device extends to the bottom of the jacking support, the first slide rail transports the pipe section to the splicing position of the wellhead, and the second slide rail transports the pipe section on the transmission device to the first slide rail; the jacking mechanism includes a slider, a clamping device and a first jacking cylinder arranged vertically, the slider and the clamping device are respectively arranged at the top and bottom of the first jacking cylinder, the slider can move along the first slide rail and the second slide rail, and the slider can move between the second slide rail and the first slide rail. The present invention solves the technical problems of poor safety of shaft excavation operations connected to existing tunnels, complicated equipment and construction methods, and high requirements on the stratum.

This utility model discloses a workpiece machining fixture, including a tooling, a steering knuckle workpiece placed on top of the tooling, a connecting block fixedly connected to the front of the tooling, and jaws movably connected to both sides of the connecting block via pins. The jaws extend from the side away from the connecting block to the top of the steering knuckle workpiece and contact its surface. An adjustment structure is provided at the bottom of the tooling, which controls the movement of the jaws and clamps the steering knuckle workpiece. The adjustment structure includes a connecting frame fixedly connected to the bottom of the tooling, a screw movably connected inside the connecting frame via bearings, and a threaded sleeve threaded to the surface of the screw. Push rods are fixedly connected to both sides of the threaded sleeve. This utility model achieves the rotational clamping action of the jaws through the pin connection between the connecting block and the jaws, forming a radial constraint force. The mechanical linkage of the adjustment structure replaces direct bolt locking, preventing the threaded pair from loosening due to vibration.

The utility model discloses a head sensor mounting device for a whole vehicle thermal management test in an environment bin, which relates to the technical field of whole vehicle thermal management tests and comprises a base plate, a fixing structure is fixedly mounted on the rear portion of the base plate, and an adjusting structure is fixedly mounted on the front portion of the base plate. A sensor body is fixedly installed on the front portion of the adjusting structure, the fixing structure comprises two supports, and the front portions of the two supports are in sliding connection with the left-right positions of the upper portion and the lower portion of the base plate. According to the head sensor mounting device for the whole vehicle thermal management test in the environment bin, through the effect of the fixing structure, the head sensor mounting device for the whole vehicle thermal management test can be adjusted according to headrests of different vehicles, so that the mounting effect of the sensor body is ensured; the straight face of the ratchet wheel and the straight face of the limiting rod extrude each other to clamp the ratchet wheel, so that the ratchet wheel is prevented from retreating, and the fixing stability of the head sensor mounting device for the thermal management test of the whole vehicle is ensured.

The utility model belongs to the field of winding equipment, and provides a winding structure with an automatic retaining function, which comprises a rack, a winding shaft and a retaining assembly. Wherein the winding shaft is rotationally mounted on the rack and is used for winding; the retaining assembly comprises a vertical seat connected to the rack, a pressing roller and a pressure-bearing roller, the pressing roller and the pressure-bearing roller are rotationally installed on the vertical seat through a one-way bearing, and the outer circle face of the pressing roller and the outer circle face of the pressure-bearing roller abut against each other and are parallel to the winding shaft. The one-way bearings arranged on the pressing roller and the pressure-bearing roller in a sleeving mode have opposite locking directions so that the sides, used for abutting against each other, of the pressing roller and the pressure-bearing roller can only rotate towards the winding shaft.

The present invention proposes a clamping device for processing automobile plate parts and a method of using the clamping device, which includes a rectangular base, two adjacent sides of the base are respectively connected with a rear stopper and a right stopper; the base is also provided with a side top pressure assembly for limiting the remaining two sides of the plate parts, which includes a left fixed block and a front fixed block respectively connected to the base; a first slide bar is slidably connected to the left fixed block, one side of the first slide bar is connected with a driving mechanism for driving the first slide bar to slide, and the other end of the first slide bar is connected with a left top pressure head; a second slide bar is slidably connected to the front fixed block, and one end of the second slide bar is connected with a front top pressure head; the first slide bar is connected to the second slide bar through a transmission mechanism; the whole device also includes an upper top pressure assembly for pressing the top of the plate parts. The present invention is easy to operate, and the plate parts can be locked from three directions at the same time by simply pushing the handle, which reduces the clamping process and improves the clamping efficiency.

The utility model provides a non-return mechanism and a baking device, and relates to the field of battery baking equipment. The non-return mechanism comprises a guide piece, a non-return piece and an elastic piece, and the guide piece is used for being connected with a second component; the non-return piece is matched with the guide piece in a sliding manner; the elastic piece is connected to the guiding piece and the non-return piece at the same time and used for making the non-return piece have the trend of making contact with the first component and driving the first component to approach the second component. The baking device comprises a non-return mechanism. The non-return mechanism can improve the stability of the relative position of the first component and the second component, reduce the failure rate and reduce the operation cost.

The present invention provides a wheat milky stage green manure precision sowing device for wheat intercropping, comprising a sowing frame, two large driving wheels are rotatably installed on the bottom side of the sowing frame through a connecting frame, a green manure seed bin is fixed on the sowing frame, a sowing screening mechanism is installed at the oblique section of the sowing frame, eight groups of lifting sowing sleeves are fixed at the tail end of the sowing frame, and the seed outlet is connected to the adjacent lifting sowing sleeves through an arc tube. The present invention is provided with a sowing screening mechanism installed at the oblique section of the sowing frame, the sowing screening mechanism is composed of eight sowing screening units fixed to each other on the same axial line, the discharge port of the green manure seed bin is externally connected with eight seed guide tubes inclined downward, and the tail end of each seed guide tube is respectively connected with the adjacent sowing screening unit, so that the sowing of eight rows of green manure seeds can be completed at a time, which is convenient for the efficient sowing operation of green manure seeds in a wheat field at the milky stage.

The invention discloses a prestressed trestle structure which comprises a trestle main beam, a tensioning mechanism, a first anchorage device, a second anchorage device, a prestressed tendon tightness adjusting mechanism and a prestressed tendon used for pressing the lower side of the trestle main beam, the prestressed tendon is arranged on the trestle main beam in a penetrating mode, and the first anchorage device and the second anchorage device are arranged at the two ends of the prestressed tendon respectively. The first anchorage device is connected with the trestle main beam through a tensioning mechanism, the trestle main beam is provided with a limiting mechanism used for preventing the first anchorage device from returning, and the second anchorage device is connected with the trestle main beam through a prestressed tendon tightness adjusting mechanism. According to the prestressed trestle structure, prestress is transmitted to the trestle main beam through the first anchorage device, the second anchorage device, the limiting mechanism and the prestressed tendon tightness adjusting mechanism, so that the lower side of the trestle main beam is pressed, the bending resistance and the overall bearing capacity of the trestle main beam are improved, and the span of the trestle main beam can be increased. The invention further discloses a tensioning method of the prestressed tendons of the prestressed trestle structure.

The invention discloses a hydraulic expansion sleeve stable in connection, and relates to the technical field of expansion sleeves, the hydraulic expansion sleeve comprises a left shaft sleeve, a right shaft sleeve, a rotating shaft and a serpentine spring, the outer side of the left shaft sleeve is sleeved with a left sleeve shell, the outer side of the right shaft sleeve is sleeved with a right sleeve shell, and the hydraulic expansion sleeve further comprises a fixing assembly arranged in the left shaft sleeve and the right shaft sleeve; a hydraulic assembly is arranged on one side of the interior of the left shaft sleeve, and a hydraulic assembly is arranged on one side of the interior of the right shaft sleeve. The left connecting part is fixedly connected to one side of the left shaft sleeve, the right connecting part is fixedly connected to the side, close to the left shaft sleeve, of the right shaft sleeve, and the fixing assembly comprises a groove and a mounting sleeve. Therefore, the abutting friction force between the expansion sleeve and the shaft sleeve and the connecting shaft is weakened, and the connecting effect and the using stability of the expansion sleeve coupler are reduced.

This application discloses a direct-drive bridge-type five-axis machining center, relating to the field of CNC machine tools. It includes a base and a worktable. Two support seats are mounted on the base. A first material cavity is formed at the end of the base away from the support seats, and a second material cavity is formed between the base and the support seats. A transverse slide is slidably connected to the support seats. Each support seat has a transverse positioning seat, with transverse stators mounted on both sides of the transverse positioning seat. Transverse movers are mounted on both sides of the transverse slide. A longitudinal slide is slidably connected to the transverse slide, with a longitudinal fixed seat mounted on it. Two rows of longitudinal stators are mounted on both sides of the longitudinal fixed seat. Two rows of longitudinal movers are mounted at the bottom of the longitudinal slide. A vertical slide is slidably connected to the longitudinal slide, with a vertical stator mounted on one side of the longitudinal slide and a vertical mover mounted on the vertical slide. This application aims to provide a sufficiently large operating space, facilitate workpiece loading and unloading, and improve the overall operating efficiency of the machining center.

This invention relates to the field of integrated structural and functional design of aero-engines, and discloses a compressor rectifier blade angle adjustment structure and method based on piezoelectric materials. The method utilizes the extension, contraction, or bending deformation of a first and second active pawl to drive the rectifier blade, equipped with ratchet wheels, to rotate to the desired angle. Furthermore, each rectifier blade is designed with two ratchet wheels, which work together to allow the blade to freely rotate in both directions. The first and second anti-return pawls effectively prevent reverse rotation and backtracking during rectifier blade angle adjustment. This invention transforms the reciprocating motion of the first and second active pawls into intermittent rotation of the rectifier blade along a certain direction, moving step by step and accumulating the rotation angle. This allows the rectifier blade angle adjustment range to reach 360°, and the adjustment accuracy can be adjusted by modifying the number of ratchet teeth as needed. This adjustment structure is superior to traditional adjustment structures, and the adjustment method has the advantage of high positioning accuracy.

The utility model provides a kind of high-pressure cleaning machine gun head, comprising: hand-held handle, hand-held handle is provided with holding cavity, hand-held handle is provided with flow-through cavity in, and the water inlet and water outlet being communicated with flow-through cavity;Hand-held handle includes switch piece, switch piece is movably set in holding cavity relative to hand-held handle, switch piece is used to control the flow of water flow in flow-through cavity in hand-held handle;Driving assembly, at least part of driving assembly is abutted with switch piece, driving assembly is used to drive switch piece movement, by the abutment cooperation of driving assembly and switch piece, realize single hand operation can continuously control water flow to flow out, to solve the technical problem of long time continuous operation in relevant technology, user needs to keep hand pinch action all the time, easily lead to hand muscle fatigue, even cause soreness or discomfort, reduce work efficiency and user experience.

The utility model discloses a pipeline fixing clamp for building construction in the field of building construction, which comprises a mounting plate serving as a main body of equipment to provide mounting positions for other parts, connecting holes and connecting mechanisms are arranged at four corners of the top of the mounting plate in a penetrating manner, and the connecting mechanisms are used for quickly connecting an upper pipe clamp and a lower pipe clamp. And the connecting mechanism comprises a mounting block, the mounting block is fixedly connected to the middles of the left side and the right side of the upper pipe clamp, and an inserting groove is formed in the top of the mounting block in a penetrating mode. And the clamping block is reset through the connecting spring, the extrusion block is blocked, and the upper pipe clamp and the lower pipe fitting are fixedly connected, so that connection through bolts is avoided, connection is simpler and more convenient, the installation speed is increased, time is saved, and the efficiency is improved.

The utility model discloses an easy-to-break cover film indentation heating forming device, including pavilion, cover film bearing roll, cover film indentation mechanism, cover film traction mechanism, on the pavilion, and between cover film indentation mechanism and cover film traction mechanism place is equipped with adjacent cover film heating mechanism, cover film forming mechanism in proper order, the cover film heating mechanism includes upper and lower heating power source and upper and lower heating plate, and the cover film forming mechanism includes forming upper die, forming lower die, forming power source and cooling plate. The utility model can carry out the double processing of indentation and stiffener forming to the bottom of the cover film for packaging, make it can keep sealed and will not leak, and also facilitate the easy-to-break state when using subsequently, be favorable to the mixing of the material that packs, effective use, has improved the blister pack quality of material.

The invention relates to the technical field of armored optical cable installation equipment, and discloses an armored optical cable clamping device and an optical cable clamping method.The armored optical cable clamping device comprises a device shell used for installing internal components, a clamping mechanism and a power block arranged on the side wall of the device shell in a sliding mode, and a first clamping plate is fixed to the outer wall of the power block; first sliding rods are symmetrically fixed to the inner walls of the upper side and the lower side in the device shell, sliding blocks are slidably arranged on the first sliding rods, and sliding plates, second moving plates, mounting plates, mounting rods, mounting plates and second clamping plates are arranged on the side walls of the sliding blocks through first supporting rods. The device is reasonable in design, the clamping mechanism can be driven to clamp and fix an armored optical cable without extra power, meanwhile, clamping and fixing of armored cables of different sizes can be better met, the applicability of the device is improved to a certain degree, and in addition, due to the arrangement of the locking mechanism, the clamping mechanism is convenient to use. Therefore, the clamping and fixing quality of the device on the armored optical cable is ensured.

An arc-extinguishing system for a switch belongs to the field of low-voltage electrical technology. It includes an arc-extinguishing chamber and a contact system. The contact system includes a moving contact and a stationary contact. After the moving contact actuates, it makes contact with or separates from the stationary contact. The arc-extinguishing chamber is located on one side of the contact system in the opening direction. The arc-extinguishing chamber includes a pair of side plates, multiple grid plates disposed between the pair of side plates, and a pair of gas-generating elements. The pair of gas-generating elements are located at the lower edge of the grid plates. The key feature is that the pair of gas-generating elements are arranged opposite each other, forming a flared opening with a larger diameter at the bottom and a smaller diameter at the top in the upward direction. The moving contact includes a long contact plate and a short contact plate, with the arc-initiating head of the long contact plate extending beyond the flared opening. Advantages: It helps the arc quickly cross the flared opening, facilitates the arc's rapid entry into the grid plates of the arc-extinguishing chamber, and effectively prevents arc retreat.